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/* * nghttp2 - HTTP/2 C Library * * Copyright (c) 2013, 2014 Tatsuhiro Tsujikawa * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef NGHTTP2_H #define NGHTTP2_H /* Define WIN32 when build target is Win32 API (borrowed from libcurl) */ #if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32) # define WIN32 #endif /* Compatibility for non-Clang compilers */ #ifndef __has_declspec_attribute # define __has_declspec_attribute(x) 0 #endif #ifdef __cplusplus extern "C" { #endif #include <stdlib.h> #if defined(_MSC_VER) && (_MSC_VER < 1800) /* MSVC < 2013 does not have inttypes.h because it is not C99 compliant. See compiler macros and version number in https://sourceforge.net/p/predef/wiki/Compilers/ */ # include <stdint.h> #else /* !defined(_MSC_VER) || (_MSC_VER >= 1800) */ # include <inttypes.h> #endif /* !defined(_MSC_VER) || (_MSC_VER >= 1800) */ #include <sys/types.h> #include <stdarg.h> #include <stddef.h> #include <nghttp2/nghttp2ver.h> #ifdef NGHTTP2_STATICLIB # define NGHTTP2_EXTERN #elif defined(WIN32) || (__has_declspec_attribute(dllexport) && \ __has_declspec_attribute(dllimport)) # ifdef BUILDING_NGHTTP2 # define NGHTTP2_EXTERN __declspec(dllexport) # else /* !BUILDING_NGHTTP2 */ # define NGHTTP2_EXTERN __declspec(dllimport) # endif /* !BUILDING_NGHTTP2 */ #else /* !defined(WIN32) */ # ifdef BUILDING_NGHTTP2 # define NGHTTP2_EXTERN __attribute__((visibility("default"))) # else /* !BUILDING_NGHTTP2 */ # define NGHTTP2_EXTERN # endif /* !BUILDING_NGHTTP2 */ #endif /* !defined(WIN32) */ /** * @typedef * * :type:`nghttp2_ssize` is a signed counterpart of size_t. */ typedef ptrdiff_t nghttp2_ssize; /** * @macro * * The protocol version identification string of this library * supports. This identifier is used if HTTP/2 is used over TLS. */ #define NGHTTP2_PROTO_VERSION_ID "h2" /** * @macro * * The length of :macro:`NGHTTP2_PROTO_VERSION_ID`. */ #define NGHTTP2_PROTO_VERSION_ID_LEN 2 /** * @macro * * The serialized form of ALPN protocol identifier this library * supports. Notice that first byte is the length of following * protocol identifier. This is the same wire format of `TLS ALPN * extension <https://tools.ietf.org/html/rfc7301>`_. This is useful * to process incoming ALPN tokens in wire format. */ #define NGHTTP2_PROTO_ALPN "\x2h2" /** * @macro * * The length of :macro:`NGHTTP2_PROTO_ALPN`. */ #define NGHTTP2_PROTO_ALPN_LEN (sizeof(NGHTTP2_PROTO_ALPN) - 1) /** * @macro * * The protocol version identification string of this library * supports. This identifier is used if HTTP/2 is used over cleartext * TCP. */ #define NGHTTP2_CLEARTEXT_PROTO_VERSION_ID "h2c" /** * @macro * * The length of :macro:`NGHTTP2_CLEARTEXT_PROTO_VERSION_ID`. */ #define NGHTTP2_CLEARTEXT_PROTO_VERSION_ID_LEN 3 struct nghttp2_session; /** * @struct * * The primary structure to hold the resources needed for a HTTP/2 * session. The details of this structure are intentionally hidden * from the public API. */ typedef struct nghttp2_session nghttp2_session; /** * @macro * * The age of :type:`nghttp2_info` */ #define NGHTTP2_VERSION_AGE 1 /** * @struct * * This struct is what `nghttp2_version()` returns. It holds * information about the particular nghttp2 version. */ typedef struct { /** * Age of this struct. This instance of nghttp2 sets it to * :macro:`NGHTTP2_VERSION_AGE` but a future version may bump it and * add more struct fields at the bottom */ int age; /** * the :macro:`NGHTTP2_VERSION_NUM` number (since age ==1) */ int version_num; /** * points to the :macro:`NGHTTP2_VERSION` string (since age ==1) */ const char *version_str; /** * points to the :macro:`NGHTTP2_PROTO_VERSION_ID` string this * instance implements (since age ==1) */ const char *proto_str; /* -------- the above fields all exist when age == 1 */ } nghttp2_info; /** * @macro * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * The default weight of stream dependency. */ #define NGHTTP2_DEFAULT_WEIGHT 16 /** * @macro * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * The maximum weight of stream dependency. */ #define NGHTTP2_MAX_WEIGHT 256 /** * @macro * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * The minimum weight of stream dependency. */ #define NGHTTP2_MIN_WEIGHT 1 /** * @macro * * The maximum window size */ #define NGHTTP2_MAX_WINDOW_SIZE ((int32_t)((1U << 31) - 1)) /** * @macro * * The initial window size for stream level flow control. */ #define NGHTTP2_INITIAL_WINDOW_SIZE ((1 << 16) - 1) /** * @macro * * The initial window size for connection level flow control. */ #define NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE ((1 << 16) - 1) /** * @macro * * The default header table size. */ #define NGHTTP2_DEFAULT_HEADER_TABLE_SIZE (1 << 12) /** * @macro * * The client magic string, which is the first 24 bytes byte string of * client connection preface. */ #define NGHTTP2_CLIENT_MAGIC "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" /** * @macro * * The length of :macro:`NGHTTP2_CLIENT_MAGIC`. */ #define NGHTTP2_CLIENT_MAGIC_LEN 24 /** * @macro * * The default max number of settings per SETTINGS frame */ #define NGHTTP2_DEFAULT_MAX_SETTINGS 32 /** * @enum * * Error codes used in this library. The code range is [-999, -500], * inclusive. The following values are defined: */ typedef enum { /** * Invalid argument passed. */ NGHTTP2_ERR_INVALID_ARGUMENT = -501, /** * Out of buffer space. */ NGHTTP2_ERR_BUFFER_ERROR = -502, /** * The specified protocol version is not supported. */ NGHTTP2_ERR_UNSUPPORTED_VERSION = -503, /** * Used as a return value from :type:`nghttp2_send_callback2`, * :type:`nghttp2_recv_callback` and * :type:`nghttp2_send_data_callback` to indicate that the operation * would block. */ NGHTTP2_ERR_WOULDBLOCK = -504, /** * General protocol error */ NGHTTP2_ERR_PROTO = -505, /** * The frame is invalid. */ NGHTTP2_ERR_INVALID_FRAME = -506, /** * The peer performed a shutdown on the connection. */ NGHTTP2_ERR_EOF = -507, /** * Used as a return value from * :func:`nghttp2_data_source_read_callback2` to indicate that data * transfer is postponed. See * :func:`nghttp2_data_source_read_callback2` for details. */ NGHTTP2_ERR_DEFERRED = -508, /** * Stream ID has reached the maximum value. Therefore no stream ID * is available. */ NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE = -509, /** * The stream is already closed; or the stream ID is invalid. */ NGHTTP2_ERR_STREAM_CLOSED = -510, /** * RST_STREAM has been added to the outbound queue. The stream is * in closing state. */ NGHTTP2_ERR_STREAM_CLOSING = -511, /** * The transmission is not allowed for this stream (e.g., a frame * with END_STREAM flag set has already sent). */ NGHTTP2_ERR_STREAM_SHUT_WR = -512, /** * The stream ID is invalid. */ NGHTTP2_ERR_INVALID_STREAM_ID = -513, /** * The state of the stream is not valid (e.g., DATA cannot be sent * to the stream if response HEADERS has not been sent). */ NGHTTP2_ERR_INVALID_STREAM_STATE = -514, /** * Another DATA frame has already been deferred. */ NGHTTP2_ERR_DEFERRED_DATA_EXIST = -515, /** * Starting new stream is not allowed (e.g., GOAWAY has been sent * and/or received). */ NGHTTP2_ERR_START_STREAM_NOT_ALLOWED = -516, /** * GOAWAY has already been sent. */ NGHTTP2_ERR_GOAWAY_ALREADY_SENT = -517, /** * The received frame contains the invalid header block (e.g., There * are duplicate header names; or the header names are not encoded * in US-ASCII character set and not lower cased; or the header name * is zero-length string; or the header value contains multiple * in-sequence NUL bytes). */ NGHTTP2_ERR_INVALID_HEADER_BLOCK = -518, /** * Indicates that the context is not suitable to perform the * requested operation. */ NGHTTP2_ERR_INVALID_STATE = -519, /** * The user callback function failed due to the temporal error. */ NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE = -521, /** * The length of the frame is invalid, either too large or too small. */ NGHTTP2_ERR_FRAME_SIZE_ERROR = -522, /** * Header block inflate/deflate error. */ NGHTTP2_ERR_HEADER_COMP = -523, /** * Flow control error */ NGHTTP2_ERR_FLOW_CONTROL = -524, /** * Insufficient buffer size given to function. */ NGHTTP2_ERR_INSUFF_BUFSIZE = -525, /** * Callback was paused by the application */ NGHTTP2_ERR_PAUSE = -526, /** * There are too many in-flight SETTING frame and no more * transmission of SETTINGS is allowed. */ NGHTTP2_ERR_TOO_MANY_INFLIGHT_SETTINGS = -527, /** * The server push is disabled. */ NGHTTP2_ERR_PUSH_DISABLED = -528, /** * DATA or HEADERS frame for a given stream has been already * submitted and has not been fully processed yet. Application * should wait for the transmission of the previously submitted * frame before submitting another. */ NGHTTP2_ERR_DATA_EXIST = -529, /** * The current session is closing due to a connection error or * `nghttp2_session_terminate_session()` is called. */ NGHTTP2_ERR_SESSION_CLOSING = -530, /** * Invalid HTTP header field was received and stream is going to be * closed. */ NGHTTP2_ERR_HTTP_HEADER = -531, /** * Violation in HTTP messaging rule. */ NGHTTP2_ERR_HTTP_MESSAGING = -532, /** * Stream was refused. */ NGHTTP2_ERR_REFUSED_STREAM = -533, /** * Unexpected internal error, but recovered. */ NGHTTP2_ERR_INTERNAL = -534, /** * Indicates that a processing was canceled. */ NGHTTP2_ERR_CANCEL = -535, /** * When a local endpoint expects to receive SETTINGS frame, it * receives an other type of frame. */ NGHTTP2_ERR_SETTINGS_EXPECTED = -536, /** * When a local endpoint receives too many settings entries * in a single SETTINGS frame. */ NGHTTP2_ERR_TOO_MANY_SETTINGS = -537, /** * The errors < :enum:`nghttp2_error.NGHTTP2_ERR_FATAL` mean that * the library is under unexpected condition and processing was * terminated (e.g., out of memory). If application receives this * error code, it must stop using that :type:`nghttp2_session` * object and only allowed operation for that object is deallocate * it using `nghttp2_session_del()`. */ NGHTTP2_ERR_FATAL = -900, /** * Out of memory. This is a fatal error. */ NGHTTP2_ERR_NOMEM = -901, /** * The user callback function failed. This is a fatal error. */ NGHTTP2_ERR_CALLBACK_FAILURE = -902, /** * Invalid client magic (see :macro:`NGHTTP2_CLIENT_MAGIC`) was * received and further processing is not possible. */ NGHTTP2_ERR_BAD_CLIENT_MAGIC = -903, /** * Possible flooding by peer was detected in this HTTP/2 session. * Flooding is measured by how many PING and SETTINGS frames with * ACK flag set are queued for transmission. These frames are * response for the peer initiated frames, and peer can cause memory * exhaustion on server side to send these frames forever and does * not read network. */ NGHTTP2_ERR_FLOODED = -904, /** * When a local endpoint receives too many CONTINUATION frames * following a HEADER frame. */ NGHTTP2_ERR_TOO_MANY_CONTINUATIONS = -905, } nghttp2_error; /** * @struct * * The object representing single contiguous buffer. */ typedef struct { /** * The pointer to the buffer. */ uint8_t *base; /** * The length of the buffer. */ size_t len; } nghttp2_vec; struct nghttp2_rcbuf; /** * @struct * * The object representing reference counted buffer. The details of * this structure are intentionally hidden from the public API. */ typedef struct nghttp2_rcbuf nghttp2_rcbuf; /** * @function * * Increments the reference count of |rcbuf| by 1. */ NGHTTP2_EXTERN void nghttp2_rcbuf_incref(nghttp2_rcbuf *rcbuf); /** * @function * * Decrements the reference count of |rcbuf| by 1. If the reference * count becomes zero, the object pointed by |rcbuf| will be freed. * In this case, application must not use |rcbuf| again. */ NGHTTP2_EXTERN void nghttp2_rcbuf_decref(nghttp2_rcbuf *rcbuf); /** * @function * * Returns the underlying buffer managed by |rcbuf|. */ NGHTTP2_EXTERN nghttp2_vec nghttp2_rcbuf_get_buf(nghttp2_rcbuf *rcbuf); /** * @function * * Returns nonzero if the underlying buffer is statically allocated, * and 0 otherwise. This can be useful for language bindings that wish * to avoid creating duplicate strings for these buffers. */ NGHTTP2_EXTERN int nghttp2_rcbuf_is_static(const nghttp2_rcbuf *rcbuf); /** * @enum * * The flags for header field name/value pair. */ typedef enum { /** * No flag set. */ NGHTTP2_NV_FLAG_NONE = 0, /** * Indicates that this name/value pair must not be indexed ("Literal * Header Field never Indexed" representation must be used in HPACK * encoding). Other implementation calls this bit as "sensitive". */ NGHTTP2_NV_FLAG_NO_INDEX = 0x01, /** * This flag is set solely by application. If this flag is set, the * library does not make a copy of header field name. This could * improve performance. */ NGHTTP2_NV_FLAG_NO_COPY_NAME = 0x02, /** * This flag is set solely by application. If this flag is set, the * library does not make a copy of header field value. This could * improve performance. */ NGHTTP2_NV_FLAG_NO_COPY_VALUE = 0x04 } nghttp2_nv_flag; /** * @struct * * The name/value pair, which mainly used to represent header fields. */ typedef struct { /** * The |name| byte string. If this struct is presented from library * (e.g., :type:`nghttp2_on_frame_recv_callback`), |name| is * guaranteed to be NULL-terminated. For some callbacks * (:type:`nghttp2_before_frame_send_callback`, * :type:`nghttp2_on_frame_send_callback`, and * :type:`nghttp2_on_frame_not_send_callback`), it may not be * NULL-terminated if header field is passed from application with * the flag :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`). * When application is constructing this struct, |name| is not * required to be NULL-terminated. */ uint8_t *name; /** * The |value| byte string. If this struct is presented from * library (e.g., :type:`nghttp2_on_frame_recv_callback`), |value| * is guaranteed to be NULL-terminated. For some callbacks * (:type:`nghttp2_before_frame_send_callback`, * :type:`nghttp2_on_frame_send_callback`, and * :type:`nghttp2_on_frame_not_send_callback`), it may not be * NULL-terminated if header field is passed from application with * the flag :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE`). * When application is constructing this struct, |value| is not * required to be NULL-terminated. */ uint8_t *value; /** * The length of the |name|, excluding terminating NULL. */ size_t namelen; /** * The length of the |value|, excluding terminating NULL. */ size_t valuelen; /** * Bitwise OR of one or more of :type:`nghttp2_nv_flag`. */ uint8_t flags; } nghttp2_nv; /** * @enum * * The frame types in HTTP/2 specification. */ typedef enum { /** * The DATA frame. */ NGHTTP2_DATA = 0, /** * The HEADERS frame. */ NGHTTP2_HEADERS = 0x01, /** * The PRIORITY frame. */ NGHTTP2_PRIORITY = 0x02, /** * The RST_STREAM frame. */ NGHTTP2_RST_STREAM = 0x03, /** * The SETTINGS frame. */ NGHTTP2_SETTINGS = 0x04, /** * The PUSH_PROMISE frame. */ NGHTTP2_PUSH_PROMISE = 0x05, /** * The PING frame. */ NGHTTP2_PING = 0x06, /** * The GOAWAY frame. */ NGHTTP2_GOAWAY = 0x07, /** * The WINDOW_UPDATE frame. */ NGHTTP2_WINDOW_UPDATE = 0x08, /** * The CONTINUATION frame. This frame type won't be passed to any * callbacks because the library processes this frame type and its * preceding HEADERS/PUSH_PROMISE as a single frame. */ NGHTTP2_CONTINUATION = 0x09, /** * The ALTSVC frame, which is defined in `RFC 7383 * <https://tools.ietf.org/html/rfc7838#section-4>`_. */ NGHTTP2_ALTSVC = 0x0a, /** * The ORIGIN frame, which is defined by `RFC 8336 * <https://tools.ietf.org/html/rfc8336>`_. */ NGHTTP2_ORIGIN = 0x0c, /** * The PRIORITY_UPDATE frame, which is defined by :rfc:`9218`. */ NGHTTP2_PRIORITY_UPDATE = 0x10 } nghttp2_frame_type; /** * @enum * * The flags for HTTP/2 frames. This enum defines all flags for all * frames. */ typedef enum { /** * No flag set. */ NGHTTP2_FLAG_NONE = 0, /** * The END_STREAM flag. */ NGHTTP2_FLAG_END_STREAM = 0x01, /** * The END_HEADERS flag. */ NGHTTP2_FLAG_END_HEADERS = 0x04, /** * The ACK flag. */ NGHTTP2_FLAG_ACK = 0x01, /** * The PADDED flag. */ NGHTTP2_FLAG_PADDED = 0x08, /** * The PRIORITY flag. */ NGHTTP2_FLAG_PRIORITY = 0x20 } nghttp2_flag; /** * @enum * The SETTINGS ID. */ typedef enum { /** * SETTINGS_HEADER_TABLE_SIZE */ NGHTTP2_SETTINGS_HEADER_TABLE_SIZE = 0x01, /** * SETTINGS_ENABLE_PUSH */ NGHTTP2_SETTINGS_ENABLE_PUSH = 0x02, /** * SETTINGS_MAX_CONCURRENT_STREAMS */ NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS = 0x03, /** * SETTINGS_INITIAL_WINDOW_SIZE */ NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE = 0x04, /** * SETTINGS_MAX_FRAME_SIZE */ NGHTTP2_SETTINGS_MAX_FRAME_SIZE = 0x05, /** * SETTINGS_MAX_HEADER_LIST_SIZE */ NGHTTP2_SETTINGS_MAX_HEADER_LIST_SIZE = 0x06, /** * SETTINGS_ENABLE_CONNECT_PROTOCOL * (`RFC 8441 <https://tools.ietf.org/html/rfc8441>`_) */ NGHTTP2_SETTINGS_ENABLE_CONNECT_PROTOCOL = 0x08, /** * SETTINGS_NO_RFC7540_PRIORITIES (:rfc:`9218`) */ NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES = 0x09 } nghttp2_settings_id; /* Note: If we add SETTINGS, update the capacity of NGHTTP2_INBOUND_NUM_IV as well */ /** * @macro * * .. warning:: * * Deprecated. The initial max concurrent streams is 0xffffffffu. * * Default maximum number of incoming concurrent streams. Use * `nghttp2_submit_settings()` with * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS` * to change the maximum number of incoming concurrent streams. * * .. note:: * * The maximum number of outgoing concurrent streams is 100 by * default. */ #define NGHTTP2_INITIAL_MAX_CONCURRENT_STREAMS ((1U << 31) - 1) /** * @enum * The status codes for the RST_STREAM and GOAWAY frames. */ typedef enum { /** * No errors. */ NGHTTP2_NO_ERROR = 0x00, /** * PROTOCOL_ERROR */ NGHTTP2_PROTOCOL_ERROR = 0x01, /** * INTERNAL_ERROR */ NGHTTP2_INTERNAL_ERROR = 0x02, /** * FLOW_CONTROL_ERROR */ NGHTTP2_FLOW_CONTROL_ERROR = 0x03, /** * SETTINGS_TIMEOUT */ NGHTTP2_SETTINGS_TIMEOUT = 0x04, /** * STREAM_CLOSED */ NGHTTP2_STREAM_CLOSED = 0x05, /** * FRAME_SIZE_ERROR */ NGHTTP2_FRAME_SIZE_ERROR = 0x06, /** * REFUSED_STREAM */ NGHTTP2_REFUSED_STREAM = 0x07, /** * CANCEL */ NGHTTP2_CANCEL = 0x08, /** * COMPRESSION_ERROR */ NGHTTP2_COMPRESSION_ERROR = 0x09, /** * CONNECT_ERROR */ NGHTTP2_CONNECT_ERROR = 0x0a, /** * ENHANCE_YOUR_CALM */ NGHTTP2_ENHANCE_YOUR_CALM = 0x0b, /** * INADEQUATE_SECURITY */ NGHTTP2_INADEQUATE_SECURITY = 0x0c, /** * HTTP_1_1_REQUIRED */ NGHTTP2_HTTP_1_1_REQUIRED = 0x0d } nghttp2_error_code; /** * @struct * The frame header. */ typedef struct { /** * The length field of this frame, excluding frame header. */ size_t length; /** * The stream identifier (aka, stream ID) */ int32_t stream_id; /** * The type of this frame. See `nghttp2_frame_type`. */ uint8_t type; /** * The flags. */ uint8_t flags; /** * Reserved bit in frame header. Currently, this is always set to 0 * and application should not expect something useful in here. */ uint8_t reserved; } nghttp2_frame_hd; /** * @union * * This union represents the some kind of data source passed to * :type:`nghttp2_data_source_read_callback2`. */ typedef union { /** * The integer field, suitable for a file descriptor. */ int fd; /** * The pointer to an arbitrary object. */ void *ptr; } nghttp2_data_source; /** * @enum * * The flags used to set in |data_flags| output parameter in * :type:`nghttp2_data_source_read_callback2`. */ typedef enum { /** * No flag set. */ NGHTTP2_DATA_FLAG_NONE = 0, /** * Indicates EOF was sensed. */ NGHTTP2_DATA_FLAG_EOF = 0x01, /** * Indicates that END_STREAM flag must not be set even if * NGHTTP2_DATA_FLAG_EOF is set. Usually this flag is used to send * trailer fields with `nghttp2_submit_request2()` or * `nghttp2_submit_response2()`. */ NGHTTP2_DATA_FLAG_NO_END_STREAM = 0x02, /** * Indicates that application will send complete DATA frame in * :type:`nghttp2_send_data_callback`. */ NGHTTP2_DATA_FLAG_NO_COPY = 0x04 } nghttp2_data_flag; #ifndef NGHTTP2_NO_SSIZE_T /** * @functypedef * * .. warning:: * * Deprecated. Use :type:`nghttp2_data_source_read_callback2` * instead. * * Callback function invoked when the library wants to read data from * the |source|. The read data is sent in the stream |stream_id|. * The implementation of this function must read at most |length| * bytes of data from |source| (or possibly other places) and store * them in |buf| and return number of data stored in |buf|. If EOF is * reached, set :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_EOF` flag * in |*data_flags|. * * Sometime it is desirable to avoid copying data into |buf| and let * application to send data directly. To achieve this, set * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_COPY` to * |*data_flags| (and possibly other flags, just like when we do * copy), and return the number of bytes to send without copying data * into |buf|. The library, seeing * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_COPY`, will invoke * :type:`nghttp2_send_data_callback`. The application must send * complete DATA frame in that callback. * * If this callback is set by `nghttp2_submit_request()`, * `nghttp2_submit_response()` or `nghttp2_submit_headers()` and * `nghttp2_submit_data()` with flag parameter * :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM` set, and * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_EOF` flag is set to * |*data_flags|, DATA frame will have END_STREAM flag set. Usually, * this is expected behaviour and all are fine. One exception is send * trailer fields. You cannot send trailer fields after sending frame * with END_STREAM set. To avoid this problem, one can set * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_END_STREAM` along * with :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_EOF` to signal the * library not to set END_STREAM in DATA frame. Then application can * use `nghttp2_submit_trailer()` to send trailer fields. * `nghttp2_submit_trailer()` can be called inside this callback. * * If the application wants to postpone DATA frames (e.g., * asynchronous I/O, or reading data blocks for long time), it is * achieved by returning :enum:`nghttp2_error.NGHTTP2_ERR_DEFERRED` * without reading any data in this invocation. The library removes * DATA frame from the outgoing queue temporarily. To move back * deferred DATA frame to outgoing queue, call * `nghttp2_session_resume_data()`. * * By default, |length| is limited to 16KiB at maximum. If peer * allows larger frames, application can enlarge transmission buffer * size. See :type:`nghttp2_data_source_read_length_callback` for * more details. * * If the application just wants to return from * `nghttp2_session_send()` or `nghttp2_session_mem_send()` without * sending anything, return :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE`. * * In case of error, there are 2 choices. Returning * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` will * close the stream by issuing RST_STREAM with * :enum:`nghttp2_error_code.NGHTTP2_INTERNAL_ERROR`. If a different * error code is desirable, use `nghttp2_submit_rst_stream()` with a * desired error code and then return * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. * Returning :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` will * signal the entire session failure. */ typedef ssize_t (*nghttp2_data_source_read_callback)( nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t length, uint32_t *data_flags, nghttp2_data_source *source, void *user_data); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @functypedef * * Callback function invoked when the library wants to read data from * the |source|. The read data is sent in the stream |stream_id|. * The implementation of this function must read at most |length| * bytes of data from |source| (or possibly other places) and store * them in |buf| and return number of data stored in |buf|. If EOF is * reached, set :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_EOF` flag * in |*data_flags|. * * Sometime it is desirable to avoid copying data into |buf| and let * application to send data directly. To achieve this, set * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_COPY` to * |*data_flags| (and possibly other flags, just like when we do * copy), and return the number of bytes to send without copying data * into |buf|. The library, seeing * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_COPY`, will invoke * :type:`nghttp2_send_data_callback`. The application must send * complete DATA frame in that callback. * * If this callback is set by `nghttp2_submit_request2()`, * `nghttp2_submit_response2()` or `nghttp2_submit_headers()` and * `nghttp2_submit_data2()` with flag parameter * :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM` set, and * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_EOF` flag is set to * |*data_flags|, DATA frame will have END_STREAM flag set. Usually, * this is expected behaviour and all are fine. One exception is send * trailer fields. You cannot send trailer fields after sending frame * with END_STREAM set. To avoid this problem, one can set * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_END_STREAM` along * with :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_EOF` to signal the * library not to set END_STREAM in DATA frame. Then application can * use `nghttp2_submit_trailer()` to send trailer fields. * `nghttp2_submit_trailer()` can be called inside this callback. * * If the application wants to postpone DATA frames (e.g., * asynchronous I/O, or reading data blocks for long time), it is * achieved by returning :enum:`nghttp2_error.NGHTTP2_ERR_DEFERRED` * without reading any data in this invocation. The library removes * DATA frame from the outgoing queue temporarily. To move back * deferred DATA frame to outgoing queue, call * `nghttp2_session_resume_data()`. * * By default, |length| is limited to 16KiB at maximum. If peer * allows larger frames, application can enlarge transmission buffer * size. See :type:`nghttp2_data_source_read_length_callback` for * more details. * * If the application just wants to return from * `nghttp2_session_send()` or `nghttp2_session_mem_send2()` without * sending anything, return :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE`. * * In case of error, there are 2 choices. Returning * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` will * close the stream by issuing RST_STREAM with * :enum:`nghttp2_error_code.NGHTTP2_INTERNAL_ERROR`. If a different * error code is desirable, use `nghttp2_submit_rst_stream()` with a * desired error code and then return * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. * Returning :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` will * signal the entire session failure. */ typedef nghttp2_ssize (*nghttp2_data_source_read_callback2)( nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t length, uint32_t *data_flags, nghttp2_data_source *source, void *user_data); #ifndef NGHTTP2_NO_SSIZE_T /** * @struct * * .. warning:: * * Deprecated. Use :type:`nghttp2_data_provider2` instead. * * This struct represents the data source and the way to read a chunk * of data from it. */ typedef struct { /** * The data source. */ nghttp2_data_source source; /** * The callback function to read a chunk of data from the |source|. */ nghttp2_data_source_read_callback read_callback; } nghttp2_data_provider; #endif /* NGHTTP2_NO_SSIZE_T */ /** * @struct * * This struct represents the data source and the way to read a chunk * of data from it. */ typedef struct { /** * The data source. */ nghttp2_data_source source; /** * The callback function to read a chunk of data from the |source|. */ nghttp2_data_source_read_callback2 read_callback; } nghttp2_data_provider2; /** * @struct * * The DATA frame. The received data is delivered via * :type:`nghttp2_on_data_chunk_recv_callback`. */ typedef struct { nghttp2_frame_hd hd; /** * The length of the padding in this frame. This includes PAD_HIGH * and PAD_LOW. */ size_t padlen; } nghttp2_data; /** * @enum * * The category of HEADERS, which indicates the role of the frame. In * HTTP/2 spec, request, response, push response and other arbitrary * headers (e.g., trailer fields) are all called just HEADERS. To * give the application the role of incoming HEADERS frame, we define * several categories. */ typedef enum { /** * The HEADERS frame is opening new stream, which is analogous to * SYN_STREAM in SPDY. */ NGHTTP2_HCAT_REQUEST = 0, /** * The HEADERS frame is the first response headers, which is * analogous to SYN_REPLY in SPDY. */ NGHTTP2_HCAT_RESPONSE = 1, /** * The HEADERS frame is the first headers sent against reserved * stream. */ NGHTTP2_HCAT_PUSH_RESPONSE = 2, /** * The HEADERS frame which does not apply for the above categories, * which is analogous to HEADERS in SPDY. If non-final response * (e.g., status 1xx) is used, final response HEADERS frame will be * categorized here. */ NGHTTP2_HCAT_HEADERS = 3 } nghttp2_headers_category; /** * @struct * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * The structure to specify stream dependency. */ typedef struct { /** * The stream ID of the stream to depend on. Specifying 0 makes * stream not depend any other stream. */ int32_t stream_id; /** * The weight of this dependency. */ int32_t weight; /** * nonzero means exclusive dependency */ uint8_t exclusive; } nghttp2_priority_spec; /** * @struct * * The HEADERS frame. It has the following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The length of the padding in this frame. This includes PAD_HIGH * and PAD_LOW. */ size_t padlen; /** * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * The priority specification */ nghttp2_priority_spec pri_spec; /** * The name/value pairs. */ nghttp2_nv *nva; /** * The number of name/value pairs in |nva|. */ size_t nvlen; /** * The category of this HEADERS frame. */ nghttp2_headers_category cat; } nghttp2_headers; /** * @struct * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * The PRIORITY frame. It has the following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The priority specification. */ nghttp2_priority_spec pri_spec; } nghttp2_priority; /** * @struct * * The RST_STREAM frame. It has the following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The error code. See :type:`nghttp2_error_code`. */ uint32_t error_code; } nghttp2_rst_stream; /** * @struct * * The SETTINGS ID/Value pair. It has the following members: */ typedef struct { /** * The SETTINGS ID. See :type:`nghttp2_settings_id`. */ int32_t settings_id; /** * The value of this entry. */ uint32_t value; } nghttp2_settings_entry; /** * @struct * * The SETTINGS frame. It has the following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The number of SETTINGS ID/Value pairs in |iv|. */ size_t niv; /** * The pointer to the array of SETTINGS ID/Value pair. */ nghttp2_settings_entry *iv; } nghttp2_settings; /** * @struct * * The PUSH_PROMISE frame. It has the following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The length of the padding in this frame. This includes PAD_HIGH * and PAD_LOW. */ size_t padlen; /** * The name/value pairs. */ nghttp2_nv *nva; /** * The number of name/value pairs in |nva|. */ size_t nvlen; /** * The promised stream ID */ int32_t promised_stream_id; /** * Reserved bit. Currently this is always set to 0 and application * should not expect something useful in here. */ uint8_t reserved; } nghttp2_push_promise; /** * @struct * * The PING frame. It has the following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The opaque data */ uint8_t opaque_data[8]; } nghttp2_ping; /** * @struct * * The GOAWAY frame. It has the following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The last stream stream ID. */ int32_t last_stream_id; /** * The error code. See :type:`nghttp2_error_code`. */ uint32_t error_code; /** * The additional debug data */ uint8_t *opaque_data; /** * The length of |opaque_data| member. */ size_t opaque_data_len; /** * Reserved bit. Currently this is always set to 0 and application * should not expect something useful in here. */ uint8_t reserved; } nghttp2_goaway; /** * @struct * * The WINDOW_UPDATE frame. It has the following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The window size increment. */ int32_t window_size_increment; /** * Reserved bit. Currently this is always set to 0 and application * should not expect something useful in here. */ uint8_t reserved; } nghttp2_window_update; /** * @struct * * The extension frame. It has following members: */ typedef struct { /** * The frame header. */ nghttp2_frame_hd hd; /** * The pointer to extension payload. The exact pointer type is * determined by hd.type. * * Currently, no extension is supported. This is a place holder for * the future extensions. */ void *payload; } nghttp2_extension; /** * @union * * This union includes all frames to pass them to various function * calls as nghttp2_frame type. The CONTINUATION frame is omitted * from here because the library deals with it internally. */ typedef union { /** * The frame header, which is convenient to inspect frame header. */ nghttp2_frame_hd hd; /** * The DATA frame. */ nghttp2_data data; /** * The HEADERS frame. */ nghttp2_headers headers; /** * The PRIORITY frame. */ nghttp2_priority priority; /** * The RST_STREAM frame. */ nghttp2_rst_stream rst_stream; /** * The SETTINGS frame. */ nghttp2_settings settings; /** * The PUSH_PROMISE frame. */ nghttp2_push_promise push_promise; /** * The PING frame. */ nghttp2_ping ping; /** * The GOAWAY frame. */ nghttp2_goaway goaway; /** * The WINDOW_UPDATE frame. */ nghttp2_window_update window_update; /** * The extension frame. */ nghttp2_extension ext; } nghttp2_frame; #ifndef NGHTTP2_NO_SSIZE_T /** * @functypedef * * .. warning:: * * Deprecated. Use :type:`nghttp2_send_callback2` instead. * * Callback function invoked when |session| wants to send data to the * remote peer. The implementation of this function must send at most * |length| bytes of data stored in |data|. The |flags| is currently * not used and always 0. It must return the number of bytes sent if * it succeeds. If it cannot send any single byte without blocking, * it must return :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`. For * other errors, it must return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. The * |user_data| pointer is the third argument passed in to the call to * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`. * * This callback is required if the application uses * `nghttp2_session_send()` to send data to the remote endpoint. If * the application uses solely `nghttp2_session_mem_send()` instead, * this callback function is unnecessary. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_send_callback()`. * * .. note:: * * The |length| may be very small. If that is the case, and * application disables Nagle algorithm (``TCP_NODELAY``), then just * writing |data| to the network stack leads to very small packet, * and it is very inefficient. An application should be responsible * to buffer up small chunks of data as necessary to avoid this * situation. */ typedef ssize_t (*nghttp2_send_callback)(nghttp2_session *session, const uint8_t *data, size_t length, int flags, void *user_data); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @functypedef * * Callback function invoked when |session| wants to send data to the * remote peer. The implementation of this function must send at most * |length| bytes of data stored in |data|. The |flags| is currently * not used and always 0. It must return the number of bytes sent if * it succeeds. If it cannot send any single byte without blocking, * it must return :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`. For * other errors, it must return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. The * |user_data| pointer is the third argument passed in to the call to * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`. * * This callback is required if the application uses * `nghttp2_session_send()` to send data to the remote endpoint. If * the application uses solely `nghttp2_session_mem_send2()` instead, * this callback function is unnecessary. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_send_callback2()`. * * .. note:: * * The |length| may be very small. If that is the case, and * application disables Nagle algorithm (``TCP_NODELAY``), then just * writing |data| to the network stack leads to very small packet, * and it is very inefficient. An application should be responsible * to buffer up small chunks of data as necessary to avoid this * situation. */ typedef nghttp2_ssize (*nghttp2_send_callback2)(nghttp2_session *session, const uint8_t *data, size_t length, int flags, void *user_data); /** * @functypedef * * Callback function invoked when * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_COPY` is used in * :type:`nghttp2_data_source_read_callback` to send complete DATA * frame. * * The |frame| is a DATA frame to send. The |framehd| is the * serialized frame header (9 bytes). The |length| is the length of * application data to send (this does not include padding). The * |source| is the same pointer passed to * :type:`nghttp2_data_source_read_callback`. * * The application first must send frame header |framehd| of length 9 * bytes. If ``frame->data.padlen > 0``, send 1 byte of value * ``frame->data.padlen - 1``. Then send exactly |length| bytes of * application data. Finally, if ``frame->data.padlen > 1``, send * ``frame->data.padlen - 1`` bytes of zero as padding. * * The application has to send complete DATA frame in this callback. * If all data were written successfully, return 0. * * If it cannot send any data at all, just return * :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`; the library will call * this callback with the same parameters later (It is recommended to * send complete DATA frame at once in this function to deal with * error; if partial frame data has already sent, it is impossible to * send another data in that state, and all we can do is tear down * connection). When data is fully processed, but application wants * to make `nghttp2_session_mem_send2()` or `nghttp2_session_send()` * return immediately without processing next frames, return * :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE`. If application decided to * reset this stream, return * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`, then * the library will send RST_STREAM with INTERNAL_ERROR as error code. * The application can also return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`, which will * result in connection closure. Returning any other value is treated * as :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` is returned. */ typedef int (*nghttp2_send_data_callback)(nghttp2_session *session, nghttp2_frame *frame, const uint8_t *framehd, size_t length, nghttp2_data_source *source, void *user_data); #ifndef NGHTTP2_NO_SSIZE_T /** * @functypedef * * .. warning:: * * Deprecated. Use :type:`nghttp2_recv_callback2` instead. * * Callback function invoked when |session| wants to receive data from * the remote peer. The implementation of this function must read at * most |length| bytes of data and store it in |buf|. The |flags| is * currently not used and always 0. It must return the number of * bytes written in |buf| if it succeeds. If it cannot read any * single byte without blocking, it must return * :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`. If it gets EOF * before it reads any single byte, it must return * :enum:`nghttp2_error.NGHTTP2_ERR_EOF`. For other errors, it must * return :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * Returning 0 is treated as * :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`. The |user_data| * pointer is the third argument passed in to the call to * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`. * * This callback is required if the application uses * `nghttp2_session_recv()` to receive data from the remote endpoint. * If the application uses solely `nghttp2_session_mem_recv()` * instead, this callback function is unnecessary. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_recv_callback()`. */ typedef ssize_t (*nghttp2_recv_callback)(nghttp2_session *session, uint8_t *buf, size_t length, int flags, void *user_data); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @functypedef * * Callback function invoked when |session| wants to receive data from * the remote peer. The implementation of this function must read at * most |length| bytes of data and store it in |buf|. The |flags| is * currently not used and always 0. It must return the number of * bytes written in |buf| if it succeeds. If it cannot read any * single byte without blocking, it must return * :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`. If it gets EOF * before it reads any single byte, it must return * :enum:`nghttp2_error.NGHTTP2_ERR_EOF`. For other errors, it must * return :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * Returning 0 is treated as * :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`. The |user_data| * pointer is the third argument passed in to the call to * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`. * * This callback is required if the application uses * `nghttp2_session_recv()` to receive data from the remote endpoint. * If the application uses solely `nghttp2_session_mem_recv2()` * instead, this callback function is unnecessary. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_recv_callback2()`. */ typedef nghttp2_ssize (*nghttp2_recv_callback2)(nghttp2_session *session, uint8_t *buf, size_t length, int flags, void *user_data); /** * @functypedef * * Callback function invoked by `nghttp2_session_recv()` and * `nghttp2_session_mem_recv2()` when a frame is received. The * |user_data| pointer is the third argument passed in to the call to * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`. * * If frame is HEADERS or PUSH_PROMISE, the ``nva`` and ``nvlen`` * member of their data structure are always ``NULL`` and 0 * respectively. The header name/value pairs are emitted via * :type:`nghttp2_on_header_callback`. * * Only HEADERS and DATA frame can signal the end of incoming data. * If ``frame->hd.flags & NGHTTP2_FLAG_END_STREAM`` is nonzero, the * |frame| is the last frame from the remote peer in this stream. * * This callback won't be called for CONTINUATION frames. * HEADERS/PUSH_PROMISE + CONTINUATIONs are treated as single frame. * * The implementation of this function must return 0 if it succeeds. * If nonzero value is returned, it is treated as fatal error and * `nghttp2_session_recv()` and `nghttp2_session_mem_recv2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_frame_recv_callback()`. */ typedef int (*nghttp2_on_frame_recv_callback)(nghttp2_session *session, const nghttp2_frame *frame, void *user_data); /** * @functypedef * * Callback function invoked by `nghttp2_session_recv()` and * `nghttp2_session_mem_recv2()` when an invalid non-DATA frame is * received. The error is indicated by the |lib_error_code|, which is * one of the values defined in :type:`nghttp2_error`. When this * callback function is invoked, the library automatically submits * either RST_STREAM or GOAWAY frame. The |user_data| pointer is the * third argument passed in to the call to * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`. * * If frame is HEADERS or PUSH_PROMISE, the ``nva`` and ``nvlen`` * member of their data structure are always ``NULL`` and 0 * respectively. * * The implementation of this function must return 0 if it succeeds. * If nonzero is returned, it is treated as fatal error and * `nghttp2_session_recv()` and `nghttp2_session_mem_recv2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_invalid_frame_recv_callback()`. */ typedef int (*nghttp2_on_invalid_frame_recv_callback)( nghttp2_session *session, const nghttp2_frame *frame, int lib_error_code, void *user_data); /** * @functypedef * * Callback function invoked when a chunk of data in DATA frame is * received. The |stream_id| is the stream ID this DATA frame belongs * to. The |flags| is the flags of DATA frame which this data chunk * is contained. ``(flags & NGHTTP2_FLAG_END_STREAM) != 0`` does not * necessarily mean this chunk of data is the last one in the stream. * You should use :type:`nghttp2_on_frame_recv_callback` to know all * data frames are received. The |user_data| pointer is the third * argument passed in to the call to `nghttp2_session_client_new()` or * `nghttp2_session_server_new()`. * * If the application uses `nghttp2_session_mem_recv2()`, it can * return :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` to make * `nghttp2_session_mem_recv2()` return without processing further * input bytes. The memory by pointed by the |data| is retained until * `nghttp2_session_mem_recv2()` or `nghttp2_session_recv()` is * called. The application must retain the input bytes which was used * to produce the |data| parameter, because it may refer to the memory * region included in the input bytes. * * The implementation of this function must return 0 if it succeeds. * If nonzero is returned, it is treated as fatal error, and * `nghttp2_session_recv()` and `nghttp2_session_mem_recv2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_data_chunk_recv_callback()`. */ typedef int (*nghttp2_on_data_chunk_recv_callback)(nghttp2_session *session, uint8_t flags, int32_t stream_id, const uint8_t *data, size_t len, void *user_data); /** * @functypedef * * Callback function invoked just before the non-DATA frame |frame| is * sent. The |user_data| pointer is the third argument passed in to * the call to `nghttp2_session_client_new()` or * `nghttp2_session_server_new()`. * * The implementation of this function must return 0 if it succeeds. * It can also return :enum:`nghttp2_error.NGHTTP2_ERR_CANCEL` to * cancel the transmission of the given frame. * * If there is a fatal error while executing this callback, the * implementation should return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`, which makes * `nghttp2_session_send()` and `nghttp2_session_mem_send2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * If the other value is returned, it is treated as if * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` is returned. * But the implementation should not rely on this since the library * may define new return value to extend its capability. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_before_frame_send_callback()`. */ typedef int (*nghttp2_before_frame_send_callback)(nghttp2_session *session, const nghttp2_frame *frame, void *user_data); /** * @functypedef * * Callback function invoked after the frame |frame| is sent. The * |user_data| pointer is the third argument passed in to the call to * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`. * * The implementation of this function must return 0 if it succeeds. * If nonzero is returned, it is treated as fatal error and * `nghttp2_session_send()` and `nghttp2_session_mem_send2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_frame_send_callback()`. */ typedef int (*nghttp2_on_frame_send_callback)(nghttp2_session *session, const nghttp2_frame *frame, void *user_data); /** * @functypedef * * Callback function invoked after the non-DATA frame |frame| is not * sent because of the error. The error is indicated by the * |lib_error_code|, which is one of the values defined in * :type:`nghttp2_error`. The |user_data| pointer is the third * argument passed in to the call to `nghttp2_session_client_new()` or * `nghttp2_session_server_new()`. * * The implementation of this function must return 0 if it succeeds. * If nonzero is returned, it is treated as fatal error and * `nghttp2_session_send()` and `nghttp2_session_mem_send2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * `nghttp2_session_get_stream_user_data()` can be used to get * associated data. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_frame_not_send_callback()`. */ typedef int (*nghttp2_on_frame_not_send_callback)(nghttp2_session *session, const nghttp2_frame *frame, int lib_error_code, void *user_data); /** * @functypedef * * Callback function invoked when the stream |stream_id| is closed. * The reason of closure is indicated by the |error_code|. The * |error_code| is usually one of :enum:`nghttp2_error_code`, but that * is not guaranteed. The stream_user_data, which was specified in * `nghttp2_submit_request2()` or `nghttp2_submit_headers()`, is still * available in this function. The |user_data| pointer is the third * argument passed in to the call to `nghttp2_session_client_new()` or * `nghttp2_session_server_new()`. * * This function is also called for a stream in reserved state. * * The implementation of this function must return 0 if it succeeds. * If nonzero is returned, it is treated as fatal error and * `nghttp2_session_recv()`, `nghttp2_session_mem_recv2()`, * `nghttp2_session_send()`, and `nghttp2_session_mem_send2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_stream_close_callback()`. */ typedef int (*nghttp2_on_stream_close_callback)(nghttp2_session *session, int32_t stream_id, uint32_t error_code, void *user_data); /** * @functypedef * * Callback function invoked when the reception of header block in * HEADERS or PUSH_PROMISE is started. Each header name/value pair * will be emitted by :type:`nghttp2_on_header_callback`. * * The ``frame->hd.flags`` may not have * :enum:`nghttp2_flag.NGHTTP2_FLAG_END_HEADERS` flag set, which * indicates that one or more CONTINUATION frames are involved. But * the application does not need to care about that because the header * name/value pairs are emitted transparently regardless of * CONTINUATION frames. * * The server applications probably create an object to store * information about new stream if ``frame->hd.type == * NGHTTP2_HEADERS`` and ``frame->headers.cat == * NGHTTP2_HCAT_REQUEST``. If |session| is configured as server side, * ``frame->headers.cat`` is either ``NGHTTP2_HCAT_REQUEST`` * containing request headers or ``NGHTTP2_HCAT_HEADERS`` containing * trailer fields and never get PUSH_PROMISE in this callback. * * For the client applications, ``frame->hd.type`` is either * ``NGHTTP2_HEADERS`` or ``NGHTTP2_PUSH_PROMISE``. In case of * ``NGHTTP2_HEADERS``, ``frame->headers.cat == * NGHTTP2_HCAT_RESPONSE`` means that it is the first response * headers, but it may be non-final response which is indicated by 1xx * status code. In this case, there may be zero or more HEADERS frame * with ``frame->headers.cat == NGHTTP2_HCAT_HEADERS`` which has * non-final response code and finally client gets exactly one HEADERS * frame with ``frame->headers.cat == NGHTTP2_HCAT_HEADERS`` * containing final response headers (non-1xx status code). The * trailer fields also has ``frame->headers.cat == * NGHTTP2_HCAT_HEADERS`` which does not contain any status code. * * Returning * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` will * close the stream (promised stream if frame is PUSH_PROMISE) by * issuing RST_STREAM with * :enum:`nghttp2_error_code.NGHTTP2_INTERNAL_ERROR`. In this case, * :type:`nghttp2_on_header_callback` and * :type:`nghttp2_on_frame_recv_callback` will not be invoked. If a * different error code is desirable, use * `nghttp2_submit_rst_stream()` with a desired error code and then * return :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. * Again, use ``frame->push_promise.promised_stream_id`` as stream_id * parameter in `nghttp2_submit_rst_stream()` if frame is * PUSH_PROMISE. * * The implementation of this function must return 0 if it succeeds. * It can return * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` to * reset the stream (promised stream if frame is PUSH_PROMISE). For * critical errors, it must return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If the other * value is returned, it is treated as if * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` is returned. If * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` is returned, * `nghttp2_session_mem_recv2()` function will immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_begin_headers_callback()`. */ typedef int (*nghttp2_on_begin_headers_callback)(nghttp2_session *session, const nghttp2_frame *frame, void *user_data); /** * @functypedef * * Callback function invoked when a header name/value pair is received * for the |frame|. The |name| of length |namelen| is header name. * The |value| of length |valuelen| is header value. The |flags| is * bitwise OR of one or more of :type:`nghttp2_nv_flag`. * * If :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_INDEX` is set in * |flags|, the receiver must not index this name/value pair when * forwarding it to the next hop. More specifically, "Literal Header * Field never Indexed" representation must be used in HPACK encoding. * * When this callback is invoked, ``frame->hd.type`` is either * :enum:`nghttp2_frame_type.NGHTTP2_HEADERS` or * :enum:`nghttp2_frame_type.NGHTTP2_PUSH_PROMISE`. After all header * name/value pairs are processed with this callback, and no error has * been detected, :type:`nghttp2_on_frame_recv_callback` will be * invoked. If there is an error in decompression, * :type:`nghttp2_on_frame_recv_callback` for the |frame| will not be * invoked. * * Both |name| and |value| are guaranteed to be NULL-terminated. The * |namelen| and |valuelen| do not include terminal NULL. If * `nghttp2_option_set_no_http_messaging()` is used with nonzero * value, NULL character may be included in |name| or |value| before * terminating NULL. * * Please note that unless `nghttp2_option_set_no_http_messaging()` is * used, nghttp2 library does perform validation against the |name| * and the |value| using `nghttp2_check_header_name()` and * `nghttp2_check_header_value()`. In addition to this, nghttp2 * performs validation based on HTTP Messaging rule, which is briefly * explained in :ref:`http-messaging` section. * * If the application uses `nghttp2_session_mem_recv2()`, it can * return :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` to make * `nghttp2_session_mem_recv2()` return without processing further * input bytes. The memory pointed by |frame|, |name| and |value| * parameters are retained until `nghttp2_session_mem_recv2()` or * `nghttp2_session_recv()` is called. The application must retain * the input bytes which was used to produce these parameters, because * it may refer to the memory region included in the input bytes. * * Returning * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` will * close the stream (promised stream if frame is PUSH_PROMISE) by * issuing RST_STREAM with * :enum:`nghttp2_error_code.NGHTTP2_INTERNAL_ERROR`. In this case, * :type:`nghttp2_on_header_callback` and * :type:`nghttp2_on_frame_recv_callback` will not be invoked. If a * different error code is desirable, use * `nghttp2_submit_rst_stream()` with a desired error code and then * return :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. * Again, use ``frame->push_promise.promised_stream_id`` as stream_id * parameter in `nghttp2_submit_rst_stream()` if frame is * PUSH_PROMISE. * * The implementation of this function must return 0 if it succeeds. * It may return :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` or * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. For * other critical failures, it must return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If the other * nonzero value is returned, it is treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` is returned, * `nghttp2_session_recv()` and `nghttp2_session_mem_recv2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_header_callback()`. * * .. warning:: * * Application should properly limit the total buffer size to store * incoming header fields. Without it, peer may send large number * of header fields or large header fields to cause out of memory in * local endpoint. Due to how HPACK works, peer can do this * effectively without using much memory on their own. */ typedef int (*nghttp2_on_header_callback)(nghttp2_session *session, const nghttp2_frame *frame, const uint8_t *name, size_t namelen, const uint8_t *value, size_t valuelen, uint8_t flags, void *user_data); /** * @functypedef * * Callback function invoked when a header name/value pair is received * for the |frame|. The |name| is header name. The |value| is header * value. The |flags| is bitwise OR of one or more of * :type:`nghttp2_nv_flag`. * * This callback behaves like :type:`nghttp2_on_header_callback`, * except that |name| and |value| are stored in reference counted * buffer. If application wishes to keep these references without * copying them, use `nghttp2_rcbuf_incref()` to increment their * reference count. It is the application's responsibility to call * `nghttp2_rcbuf_decref()` if they called `nghttp2_rcbuf_incref()` so * as not to leak memory. If the |session| is created by * `nghttp2_session_server_new3()` or `nghttp2_session_client_new3()`, * the function to free memory is the one belongs to the mem * parameter. As long as this free function alives, |name| and * |value| can live after |session| was destroyed. */ typedef int (*nghttp2_on_header_callback2)(nghttp2_session *session, const nghttp2_frame *frame, nghttp2_rcbuf *name, nghttp2_rcbuf *value, uint8_t flags, void *user_data); /** * @functypedef * * Callback function invoked when a invalid header name/value pair is * received for the |frame|. * * The parameter and behaviour are similar to * :type:`nghttp2_on_header_callback`. The difference is that this * callback is only invoked when a invalid header name/value pair is * received which is treated as stream error if this callback is not * set. Only invalid regular header field are passed to this * callback. In other words, invalid pseudo header field is not * passed to this callback. Also header fields which includes upper * cased latter are also treated as error without passing them to this * callback. * * This callback is only considered if HTTP messaging validation is * turned on (which is on by default, see * `nghttp2_option_set_no_http_messaging()`). * * With this callback, application inspects the incoming invalid * field, and it also can reset stream from this callback by returning * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. By * default, the error code is * :enum:`nghttp2_error_code.NGHTTP2_PROTOCOL_ERROR`. To change the * error code, call `nghttp2_submit_rst_stream()` with the error code * of choice in addition to returning * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. * * If 0 is returned, the header field is ignored, and the stream is * not reset. */ typedef int (*nghttp2_on_invalid_header_callback)( nghttp2_session *session, const nghttp2_frame *frame, const uint8_t *name, size_t namelen, const uint8_t *value, size_t valuelen, uint8_t flags, void *user_data); /** * @functypedef * * Callback function invoked when a invalid header name/value pair is * received for the |frame|. * * The parameter and behaviour are similar to * :type:`nghttp2_on_header_callback2`. The difference is that this * callback is only invoked when a invalid header name/value pair is * received which is silently ignored if this callback is not set. * Only invalid regular header field are passed to this callback. In * other words, invalid pseudo header field is not passed to this * callback. Also header fields which includes upper cased latter are * also treated as error without passing them to this callback. * * This callback is only considered if HTTP messaging validation is * turned on (which is on by default, see * `nghttp2_option_set_no_http_messaging()`). * * With this callback, application inspects the incoming invalid * field, and it also can reset stream from this callback by returning * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. By * default, the error code is * :enum:`nghttp2_error_code.NGHTTP2_INTERNAL_ERROR`. To change the * error code, call `nghttp2_submit_rst_stream()` with the error code * of choice in addition to returning * :enum:`nghttp2_error.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. */ typedef int (*nghttp2_on_invalid_header_callback2)( nghttp2_session *session, const nghttp2_frame *frame, nghttp2_rcbuf *name, nghttp2_rcbuf *value, uint8_t flags, void *user_data); #ifndef NGHTTP2_NO_SSIZE_T /** * @functypedef * * .. warning:: * * Deprecated. Use :type:`nghttp2_select_padding_callback2` * instead. * * Callback function invoked when the library asks application how * many padding bytes are required for the transmission of the * |frame|. The application must choose the total length of payload * including padded bytes in range [frame->hd.length, max_payloadlen], * inclusive. Choosing number not in this range will be treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. Returning * ``frame->hd.length`` means no padding is added. Returning * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` will make * `nghttp2_session_send()` and `nghttp2_session_mem_send()` functions * immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_select_padding_callback()`. */ typedef ssize_t (*nghttp2_select_padding_callback)(nghttp2_session *session, const nghttp2_frame *frame, size_t max_payloadlen, void *user_data); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @functypedef * * Callback function invoked when the library asks application how * many padding bytes are required for the transmission of the * |frame|. The application must choose the total length of payload * including padded bytes in range [frame->hd.length, max_payloadlen], * inclusive. Choosing number not in this range will be treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. Returning * ``frame->hd.length`` means no padding is added. Returning * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` will make * `nghttp2_session_send()` and `nghttp2_session_mem_send2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_select_padding_callback2()`. */ typedef nghttp2_ssize (*nghttp2_select_padding_callback2)( nghttp2_session *session, const nghttp2_frame *frame, size_t max_payloadlen, void *user_data); #ifndef NGHTTP2_NO_SSIZE_T /** * @functypedef * * .. warning:: * * Deprecated. Use * :type:`nghttp2_data_source_read_length_callback2` instead. * * Callback function invoked when library wants to get max length of * data to send data to the remote peer. The implementation of this * function should return a value in the following range. [1, * min(|session_remote_window_size|, |stream_remote_window_size|, * |remote_max_frame_size|)]. If a value greater than this range is * returned than the max allow value will be used. Returning a value * smaller than this range is treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. The * |frame_type| is provided for future extensibility and identifies * the type of frame (see :type:`nghttp2_frame_type`) for which to get * the length for. Currently supported frame types are: * :enum:`nghttp2_frame_type.NGHTTP2_DATA`. * * This callback can be used to control the length in bytes for which * :type:`nghttp2_data_source_read_callback` is allowed to send to the * remote endpoint. This callback is optional. Returning * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` will signal the * entire session failure. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_data_source_read_length_callback()`. */ typedef ssize_t (*nghttp2_data_source_read_length_callback)( nghttp2_session *session, uint8_t frame_type, int32_t stream_id, int32_t session_remote_window_size, int32_t stream_remote_window_size, uint32_t remote_max_frame_size, void *user_data); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @functypedef * * Callback function invoked when library wants to get max length of * data to send data to the remote peer. The implementation of this * function should return a value in the following range. [1, * min(|session_remote_window_size|, |stream_remote_window_size|, * |remote_max_frame_size|)]. If a value greater than this range is * returned than the max allow value will be used. Returning a value * smaller than this range is treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. The * |frame_type| is provided for future extensibility and identifies * the type of frame (see :type:`nghttp2_frame_type`) for which to get * the length for. Currently supported frame types are: * :enum:`nghttp2_frame_type.NGHTTP2_DATA`. * * This callback can be used to control the length in bytes for which * :type:`nghttp2_data_source_read_callback` is allowed to send to the * remote endpoint. This callback is optional. Returning * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` will signal the * entire session failure. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_data_source_read_length_callback2()`. */ typedef nghttp2_ssize (*nghttp2_data_source_read_length_callback2)( nghttp2_session *session, uint8_t frame_type, int32_t stream_id, int32_t session_remote_window_size, int32_t stream_remote_window_size, uint32_t remote_max_frame_size, void *user_data); /** * @functypedef * * Callback function invoked when a frame header is received. The * |hd| points to received frame header. * * Unlike :type:`nghttp2_on_frame_recv_callback`, this callback will * also be called when frame header of CONTINUATION frame is received. * * If both :type:`nghttp2_on_begin_frame_callback` and * :type:`nghttp2_on_begin_headers_callback` are set and HEADERS or * PUSH_PROMISE is received, :type:`nghttp2_on_begin_frame_callback` * will be called first. * * The implementation of this function must return 0 if it succeeds. * If nonzero value is returned, it is treated as fatal error and * `nghttp2_session_recv()` and `nghttp2_session_mem_recv2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * * To set this callback to :type:`nghttp2_session_callbacks`, use * `nghttp2_session_callbacks_set_on_begin_frame_callback()`. */ typedef int (*nghttp2_on_begin_frame_callback)(nghttp2_session *session, const nghttp2_frame_hd *hd, void *user_data); /** * @functypedef * * Callback function invoked when chunk of extension frame payload is * received. The |hd| points to frame header. The received * chunk is |data| of length |len|. * * The implementation of this function must return 0 if it succeeds. * * To abort processing this extension frame, return * :enum:`nghttp2_error.NGHTTP2_ERR_CANCEL`. * * If fatal error occurred, application should return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. In this case, * `nghttp2_session_recv()` and `nghttp2_session_mem_recv2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If the other * values are returned, currently they are treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. */ typedef int (*nghttp2_on_extension_chunk_recv_callback)( nghttp2_session *session, const nghttp2_frame_hd *hd, const uint8_t *data, size_t len, void *user_data); /** * @functypedef * * Callback function invoked when library asks the application to * unpack extension payload from its wire format. The extension * payload has been passed to the application using * :type:`nghttp2_on_extension_chunk_recv_callback`. The frame header * is already unpacked by the library and provided as |hd|. * * To receive extension frames, the application must tell desired * extension frame type to the library using * `nghttp2_option_set_user_recv_extension_type()`. * * The implementation of this function may store the pointer to the * created object as a result of unpacking in |*payload|, and returns * 0. The pointer stored in |*payload| is opaque to the library, and * the library does not own its pointer. |*payload| is initialized as * ``NULL``. The |*payload| is available as ``frame->ext.payload`` in * :type:`nghttp2_on_frame_recv_callback`. Therefore if application * can free that memory inside :type:`nghttp2_on_frame_recv_callback` * callback. Of course, application has a liberty not to use * |*payload|, and do its own mechanism to process extension frames. * * To abort processing this extension frame, return * :enum:`nghttp2_error.NGHTTP2_ERR_CANCEL`. * * If fatal error occurred, application should return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. In this case, * `nghttp2_session_recv()` and `nghttp2_session_mem_recv2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If the other * values are returned, currently they are treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. */ typedef int (*nghttp2_unpack_extension_callback)(nghttp2_session *session, void **payload, const nghttp2_frame_hd *hd, void *user_data); #ifndef NGHTTP2_NO_SSIZE_T /** * @functypedef * * .. warning:: * * Deprecated. Use :type:`nghttp2_pack_extension_callback2` * instead. * * Callback function invoked when library asks the application to pack * extension payload in its wire format. The frame header will be * packed by library. Application must pack payload only. * ``frame->ext.payload`` is the object passed to * `nghttp2_submit_extension()` as payload parameter. Application * must pack extension payload to the |buf| of its capacity |len| * bytes. The |len| is at least 16KiB. * * The implementation of this function should return the number of * bytes written into |buf| when it succeeds. * * To abort processing this extension frame, return * :enum:`nghttp2_error.NGHTTP2_ERR_CANCEL`, and * :type:`nghttp2_on_frame_not_send_callback` will be invoked. * * If fatal error occurred, application should return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. In this case, * `nghttp2_session_send()` and `nghttp2_session_mem_send()` functions * immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If the other * values are returned, currently they are treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If the return * value is strictly larger than |len|, it is treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. */ typedef ssize_t (*nghttp2_pack_extension_callback)(nghttp2_session *session, uint8_t *buf, size_t len, const nghttp2_frame *frame, void *user_data); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @functypedef * * Callback function invoked when library asks the application to pack * extension payload in its wire format. The frame header will be * packed by library. Application must pack payload only. * ``frame->ext.payload`` is the object passed to * `nghttp2_submit_extension()` as payload parameter. Application * must pack extension payload to the |buf| of its capacity |len| * bytes. The |len| is at least 16KiB. * * The implementation of this function should return the number of * bytes written into |buf| when it succeeds. * * To abort processing this extension frame, return * :enum:`nghttp2_error.NGHTTP2_ERR_CANCEL`, and * :type:`nghttp2_on_frame_not_send_callback` will be invoked. * * If fatal error occurred, application should return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. In this case, * `nghttp2_session_send()` and `nghttp2_session_mem_send2()` * functions immediately return * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If the other * values are returned, currently they are treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. If the return * value is strictly larger than |len|, it is treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. */ typedef nghttp2_ssize (*nghttp2_pack_extension_callback2)( nghttp2_session *session, uint8_t *buf, size_t len, const nghttp2_frame *frame, void *user_data); /** * @functypedef * * .. warning:: * * Deprecated. Use :type:`nghttp2_error_callback2` instead. * * Callback function invoked when library provides the error message * intended for human consumption. This callback is solely for * debugging purpose. The |msg| is typically NULL-terminated string * of length |len|. |len| does not include the sentinel NULL * character. * * The format of error message may change between nghttp2 library * versions. The application should not depend on the particular * format. * * Normally, application should return 0 from this callback. If fatal * error occurred while doing something in this callback, application * should return :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * In this case, library will return immediately with return value * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. Currently, if * nonzero value is returned from this callback, they are treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`, but application * should not rely on this details. */ typedef int (*nghttp2_error_callback)(nghttp2_session *session, const char *msg, size_t len, void *user_data); /** * @functypedef * * Callback function invoked when library provides the error code, and * message. This callback is solely for debugging purpose. * |lib_error_code| is one of error code defined in * :enum:`nghttp2_error`. The |msg| is typically NULL-terminated * string of length |len|, and intended for human consumption. |len| * does not include the sentinel NULL character. * * The format of error message may change between nghttp2 library * versions. The application should not depend on the particular * format. * * Normally, application should return 0 from this callback. If fatal * error occurred while doing something in this callback, application * should return :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. * In this case, library will return immediately with return value * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`. Currently, if * nonzero value is returned from this callback, they are treated as * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`, but application * should not rely on this details. */ typedef int (*nghttp2_error_callback2)(nghttp2_session *session, int lib_error_code, const char *msg, size_t len, void *user_data); struct nghttp2_session_callbacks; /** * @struct * * Callback functions for :type:`nghttp2_session`. The details of * this structure are intentionally hidden from the public API. */ typedef struct nghttp2_session_callbacks nghttp2_session_callbacks; /** * @function * * Initializes |*callbacks_ptr| with NULL values. * * The initialized object can be used when initializing multiple * :type:`nghttp2_session` objects. * * When the application finished using this object, it can use * `nghttp2_session_callbacks_del()` to free its memory. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_callbacks_new(nghttp2_session_callbacks **callbacks_ptr); /** * @function * * Frees any resources allocated for |callbacks|. If |callbacks| is * ``NULL``, this function does nothing. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_del(nghttp2_session_callbacks *callbacks); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_session_callbacks_set_send_callback2()` * with :type:`nghttp2_send_callback2` instead. * * Sets callback function invoked when a session wants to send data to * the remote peer. This callback is not necessary if the application * uses solely `nghttp2_session_mem_send()` to serialize data to * transmit. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_send_callback( nghttp2_session_callbacks *cbs, nghttp2_send_callback send_callback); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Sets callback function invoked when a session wants to send data to * the remote peer. This callback is not necessary if the application * uses solely `nghttp2_session_mem_send2()` to serialize data to * transmit. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_send_callback2( nghttp2_session_callbacks *cbs, nghttp2_send_callback2 send_callback); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_session_callbacks_set_recv_callback2()` * with :type:`nghttp2_recv_callback2` instead. * * Sets callback function invoked when the a session wants to receive * data from the remote peer. This callback is not necessary if the * application uses solely `nghttp2_session_mem_recv()` to process * received data. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_recv_callback( nghttp2_session_callbacks *cbs, nghttp2_recv_callback recv_callback); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Sets callback function invoked when the a session wants to receive * data from the remote peer. This callback is not necessary if the * application uses solely `nghttp2_session_mem_recv2()` to process * received data. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_recv_callback2( nghttp2_session_callbacks *cbs, nghttp2_recv_callback2 recv_callback); /** * @function * * Sets callback function invoked by `nghttp2_session_recv()` and * `nghttp2_session_mem_recv2()` when a frame is received. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_frame_recv_callback( nghttp2_session_callbacks *cbs, nghttp2_on_frame_recv_callback on_frame_recv_callback); /** * @function * * Sets callback function invoked by `nghttp2_session_recv()` and * `nghttp2_session_mem_recv2()` when an invalid non-DATA frame is * received. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_invalid_frame_recv_callback( nghttp2_session_callbacks *cbs, nghttp2_on_invalid_frame_recv_callback on_invalid_frame_recv_callback); /** * @function * * Sets callback function invoked when a chunk of data in DATA frame * is received. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_data_chunk_recv_callback( nghttp2_session_callbacks *cbs, nghttp2_on_data_chunk_recv_callback on_data_chunk_recv_callback); /** * @function * * Sets callback function invoked before a non-DATA frame is sent. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_before_frame_send_callback( nghttp2_session_callbacks *cbs, nghttp2_before_frame_send_callback before_frame_send_callback); /** * @function * * Sets callback function invoked after a frame is sent. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_frame_send_callback( nghttp2_session_callbacks *cbs, nghttp2_on_frame_send_callback on_frame_send_callback); /** * @function * * Sets callback function invoked when a non-DATA frame is not sent * because of an error. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_frame_not_send_callback( nghttp2_session_callbacks *cbs, nghttp2_on_frame_not_send_callback on_frame_not_send_callback); /** * @function * * Sets callback function invoked when the stream is closed. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_stream_close_callback( nghttp2_session_callbacks *cbs, nghttp2_on_stream_close_callback on_stream_close_callback); /** * @function * * Sets callback function invoked when the reception of header block * in HEADERS or PUSH_PROMISE is started. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_begin_headers_callback( nghttp2_session_callbacks *cbs, nghttp2_on_begin_headers_callback on_begin_headers_callback); /** * @function * * Sets callback function invoked when a header name/value pair is * received. If both * `nghttp2_session_callbacks_set_on_header_callback()` and * `nghttp2_session_callbacks_set_on_header_callback2()` are used to * set callbacks, the latter has the precedence. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_header_callback( nghttp2_session_callbacks *cbs, nghttp2_on_header_callback on_header_callback); /** * @function * * Sets callback function invoked when a header name/value pair is * received. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_header_callback2( nghttp2_session_callbacks *cbs, nghttp2_on_header_callback2 on_header_callback2); /** * @function * * Sets callback function invoked when a invalid header name/value * pair is received. If both * `nghttp2_session_callbacks_set_on_invalid_header_callback()` and * `nghttp2_session_callbacks_set_on_invalid_header_callback2()` are * used to set callbacks, the latter takes the precedence. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_invalid_header_callback( nghttp2_session_callbacks *cbs, nghttp2_on_invalid_header_callback on_invalid_header_callback); /** * @function * * Sets callback function invoked when a invalid header name/value * pair is received. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_invalid_header_callback2( nghttp2_session_callbacks *cbs, nghttp2_on_invalid_header_callback2 on_invalid_header_callback2); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use * `nghttp2_session_callbacks_set_select_padding_callback2()` with * :type:`nghttp2_select_padding_callback2` instead. * * Sets callback function invoked when the library asks application * how many padding bytes are required for the transmission of the * given frame. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_select_padding_callback( nghttp2_session_callbacks *cbs, nghttp2_select_padding_callback select_padding_callback); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Sets callback function invoked when the library asks application * how many padding bytes are required for the transmission of the * given frame. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_select_padding_callback2( nghttp2_session_callbacks *cbs, nghttp2_select_padding_callback2 select_padding_callback); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use * `nghttp2_session_callbacks_set_data_source_read_length_callback2()` * with :type:`nghttp2_data_source_read_length_callback2` instead. * * Sets callback function determine the length allowed in * :type:`nghttp2_data_source_read_callback`. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_data_source_read_length_callback( nghttp2_session_callbacks *cbs, nghttp2_data_source_read_length_callback data_source_read_length_callback); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Sets callback function determine the length allowed in * :type:`nghttp2_data_source_read_callback2`. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_data_source_read_length_callback2( nghttp2_session_callbacks *cbs, nghttp2_data_source_read_length_callback2 data_source_read_length_callback); /** * @function * * Sets callback function invoked when a frame header is received. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_begin_frame_callback( nghttp2_session_callbacks *cbs, nghttp2_on_begin_frame_callback on_begin_frame_callback); /** * @function * * Sets callback function invoked when * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_COPY` is used in * :type:`nghttp2_data_source_read_callback2` to avoid data copy. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_send_data_callback( nghttp2_session_callbacks *cbs, nghttp2_send_data_callback send_data_callback); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use * `nghttp2_session_callbacks_set_pack_extension_callback2()` with * :type:`nghttp2_pack_extension_callback2` instead. * * Sets callback function invoked when the library asks the * application to pack extension frame payload in wire format. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_pack_extension_callback( nghttp2_session_callbacks *cbs, nghttp2_pack_extension_callback pack_extension_callback); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Sets callback function invoked when the library asks the * application to pack extension frame payload in wire format. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_pack_extension_callback2( nghttp2_session_callbacks *cbs, nghttp2_pack_extension_callback2 pack_extension_callback); /** * @function * * Sets callback function invoked when the library asks the * application to unpack extension frame payload from wire format. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_unpack_extension_callback( nghttp2_session_callbacks *cbs, nghttp2_unpack_extension_callback unpack_extension_callback); /** * @function * * Sets callback function invoked when chunk of extension frame * payload is received. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_on_extension_chunk_recv_callback( nghttp2_session_callbacks *cbs, nghttp2_on_extension_chunk_recv_callback on_extension_chunk_recv_callback); /** * @function * * .. warning:: * * Deprecated. Use * `nghttp2_session_callbacks_set_error_callback2()` with * :type:`nghttp2_error_callback2` instead. * * Sets callback function invoked when library tells error message to * the application. * * If both :type:`nghttp2_error_callback` and * :type:`nghttp2_error_callback2` are set, the latter takes * precedence. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_error_callback( nghttp2_session_callbacks *cbs, nghttp2_error_callback error_callback); /** * @function * * Sets callback function invoked when library tells error code, and * message to the application. * * If both :type:`nghttp2_error_callback` and * :type:`nghttp2_error_callback2` are set, the latter takes * precedence. */ NGHTTP2_EXTERN void nghttp2_session_callbacks_set_error_callback2( nghttp2_session_callbacks *cbs, nghttp2_error_callback2 error_callback2); /** * @functypedef * * Custom memory allocator to replace malloc(). The |mem_user_data| * is the mem_user_data member of :type:`nghttp2_mem` structure. */ typedef void *(*nghttp2_malloc)(size_t size, void *mem_user_data); /** * @functypedef * * Custom memory allocator to replace free(). The |mem_user_data| is * the mem_user_data member of :type:`nghttp2_mem` structure. */ typedef void (*nghttp2_free)(void *ptr, void *mem_user_data); /** * @functypedef * * Custom memory allocator to replace calloc(). The |mem_user_data| * is the mem_user_data member of :type:`nghttp2_mem` structure. */ typedef void *(*nghttp2_calloc)(size_t nmemb, size_t size, void *mem_user_data); /** * @functypedef * * Custom memory allocator to replace realloc(). The |mem_user_data| * is the mem_user_data member of :type:`nghttp2_mem` structure. */ typedef void *(*nghttp2_realloc)(void *ptr, size_t size, void *mem_user_data); /** * @struct * * Custom memory allocator functions and user defined pointer. The * |mem_user_data| member is passed to each allocator function. This * can be used, for example, to achieve per-session memory pool. * * In the following example code, ``my_malloc``, ``my_free``, * ``my_calloc`` and ``my_realloc`` are the replacement of the * standard allocators ``malloc``, ``free``, ``calloc`` and * ``realloc`` respectively:: * * void *my_malloc_cb(size_t size, void *mem_user_data) { * return my_malloc(size); * } * * void my_free_cb(void *ptr, void *mem_user_data) { my_free(ptr); } * * void *my_calloc_cb(size_t nmemb, size_t size, void *mem_user_data) { * return my_calloc(nmemb, size); * } * * void *my_realloc_cb(void *ptr, size_t size, void *mem_user_data) { * return my_realloc(ptr, size); * } * * void session_new() { * nghttp2_session *session; * nghttp2_session_callbacks *callbacks; * nghttp2_mem mem = {NULL, my_malloc_cb, my_free_cb, my_calloc_cb, * my_realloc_cb}; * * ... * * nghttp2_session_client_new3(&session, callbacks, NULL, NULL, &mem); * * ... * } */ typedef struct { /** * An arbitrary user supplied data. This is passed to each * allocator function. */ void *mem_user_data; /** * Custom allocator function to replace malloc(). */ nghttp2_malloc malloc; /** * Custom allocator function to replace free(). */ nghttp2_free free; /** * Custom allocator function to replace calloc(). */ nghttp2_calloc calloc; /** * Custom allocator function to replace realloc(). */ nghttp2_realloc realloc; } nghttp2_mem; struct nghttp2_option; /** * @struct * * Configuration options for :type:`nghttp2_session`. The details of * this structure are intentionally hidden from the public API. */ typedef struct nghttp2_option nghttp2_option; /** * @function * * Initializes |*option_ptr| with default values. * * When the application finished using this object, it can use * `nghttp2_option_del()` to free its memory. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_option_new(nghttp2_option **option_ptr); /** * @function * * Frees any resources allocated for |option|. If |option| is * ``NULL``, this function does nothing. */ NGHTTP2_EXTERN void nghttp2_option_del(nghttp2_option *option); /** * @function * * This option prevents the library from sending WINDOW_UPDATE for a * connection automatically. If this option is set to nonzero, the * library won't send WINDOW_UPDATE for DATA until application calls * `nghttp2_session_consume()` to indicate the consumed amount of * data. Don't use `nghttp2_submit_window_update()` for this purpose. * By default, this option is set to zero. */ NGHTTP2_EXTERN void nghttp2_option_set_no_auto_window_update(nghttp2_option *option, int val); /** * @function * * This option sets the SETTINGS_MAX_CONCURRENT_STREAMS value of * remote endpoint as if it is received in SETTINGS frame. Without * specifying this option, the maximum number of outgoing concurrent * streams is initially limited to 100 to avoid issues when the local * endpoint submits lots of requests before receiving initial SETTINGS * frame from the remote endpoint, since sending them at once to the * remote endpoint could lead to rejection of some of the requests. * This value will be overwritten when the local endpoint receives * initial SETTINGS frame from the remote endpoint, either to the * value advertised in SETTINGS_MAX_CONCURRENT_STREAMS or to the * default value (unlimited) if none was advertised. */ NGHTTP2_EXTERN void nghttp2_option_set_peer_max_concurrent_streams(nghttp2_option *option, uint32_t val); /** * @function * * By default, nghttp2 library, if configured as server, requires * first 24 bytes of client magic byte string (MAGIC). In most cases, * this will simplify the implementation of server. But sometimes * server may want to detect the application protocol based on first * few bytes on clear text communication. * * If this option is used with nonzero |val|, nghttp2 library does not * handle MAGIC. It still checks following SETTINGS frame. This * means that applications should deal with MAGIC by themselves. * * If this option is not used or used with zero value, if MAGIC does * not match :macro:`NGHTTP2_CLIENT_MAGIC`, `nghttp2_session_recv()` * and `nghttp2_session_mem_recv2()` will return error * :enum:`nghttp2_error.NGHTTP2_ERR_BAD_CLIENT_MAGIC`, which is fatal * error. */ NGHTTP2_EXTERN void nghttp2_option_set_no_recv_client_magic(nghttp2_option *option, int val); /** * @function * * By default, nghttp2 library enforces subset of HTTP Messaging rules * described in `HTTP/2 specification, section 8 * <https://tools.ietf.org/html/rfc7540#section-8>`_. See * :ref:`http-messaging` section for details. For those applications * who use nghttp2 library as non-HTTP use, give nonzero to |val| to * disable this enforcement. Please note that disabling this feature * does not change the fundamental client and server model of HTTP. * That is, even if the validation is disabled, only client can send * requests. */ NGHTTP2_EXTERN void nghttp2_option_set_no_http_messaging(nghttp2_option *option, int val); /** * @function * * RFC 7540 does not enforce any limit on the number of incoming * reserved streams (in RFC 7540 terms, streams in reserved (remote) * state). This only affects client side, since only server can push * streams. Malicious server can push arbitrary number of streams, * and make client's memory exhausted. This option can set the * maximum number of such incoming streams to avoid possible memory * exhaustion. If this option is set, and pushed streams are * automatically closed on reception, without calling user provided * callback, if they exceed the given limit. The default value is * 200. If session is configured as server side, this option has no * effect. Server can control the number of streams to push. */ NGHTTP2_EXTERN void nghttp2_option_set_max_reserved_remote_streams(nghttp2_option *option, uint32_t val); /** * @function * * Sets extension frame type the application is willing to handle with * user defined callbacks (see * :type:`nghttp2_on_extension_chunk_recv_callback` and * :type:`nghttp2_unpack_extension_callback`). The |type| is * extension frame type, and must be strictly greater than 0x9. * Otherwise, this function does nothing. The application can call * this function multiple times to set more than one frame type to * receive. The application does not have to call this function if it * just sends extension frames. */ NGHTTP2_EXTERN void nghttp2_option_set_user_recv_extension_type(nghttp2_option *option, uint8_t type); /** * @function * * Sets extension frame type the application is willing to receive * using builtin handler. The |type| is the extension frame type to * receive, and must be strictly greater than 0x9. Otherwise, this * function does nothing. The application can call this function * multiple times to set more than one frame type to receive. The * application does not have to call this function if it just sends * extension frames. * * If same frame type is passed to both * `nghttp2_option_set_builtin_recv_extension_type()` and * `nghttp2_option_set_user_recv_extension_type()`, the latter takes * precedence. */ NGHTTP2_EXTERN void nghttp2_option_set_builtin_recv_extension_type(nghttp2_option *option, uint8_t type); /** * @function * * This option prevents the library from sending PING frame with ACK * flag set automatically when PING frame without ACK flag set is * received. If this option is set to nonzero, the library won't send * PING frame with ACK flag set in the response for incoming PING * frame. The application can send PING frame with ACK flag set using * `nghttp2_submit_ping()` with :enum:`nghttp2_flag.NGHTTP2_FLAG_ACK` * as flags parameter. */ NGHTTP2_EXTERN void nghttp2_option_set_no_auto_ping_ack(nghttp2_option *option, int val); /** * @function * * This option sets the maximum length of header block (a set of * header fields per one HEADERS frame) to send. The length of a * given set of header fields is calculated using * `nghttp2_hd_deflate_bound()`. The default value is 64KiB. If * application attempts to send header fields larger than this limit, * the transmission of the frame fails with error code * :enum:`nghttp2_error.NGHTTP2_ERR_FRAME_SIZE_ERROR`. */ NGHTTP2_EXTERN void nghttp2_option_set_max_send_header_block_length(nghttp2_option *option, size_t val); /** * @function * * This option sets the maximum dynamic table size for deflating * header fields. The default value is 4KiB. In HTTP/2, receiver of * deflated header block can specify maximum dynamic table size. The * actual maximum size is the minimum of the size receiver specified * and this option value. */ NGHTTP2_EXTERN void nghttp2_option_set_max_deflate_dynamic_table_size(nghttp2_option *option, size_t val); /** * @function * * This option prevents the library from retaining closed streams to * maintain the priority tree. If this option is set to nonzero, * applications can discard closed stream completely to save memory. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is submitted via `nghttp2_submit_settings()`, any * closed streams are not retained regardless of this option. */ NGHTTP2_EXTERN void nghttp2_option_set_no_closed_streams(nghttp2_option *option, int val); /** * @function * * This function sets the maximum number of outgoing SETTINGS ACK and * PING ACK frames retained in :type:`nghttp2_session` object. If * more than those frames are retained, the peer is considered to be * misbehaving and session will be closed. The default value is 1000. */ NGHTTP2_EXTERN void nghttp2_option_set_max_outbound_ack(nghttp2_option *option, size_t val); /** * @function * * This function sets the maximum number of SETTINGS entries per * SETTINGS frame that will be accepted. If more than those entries * are received, the peer is considered to be misbehaving and session * will be closed. The default value is 32. */ NGHTTP2_EXTERN void nghttp2_option_set_max_settings(nghttp2_option *option, size_t val); /** * @function * * This option, if set to nonzero, allows server to fallback to * :rfc:`7540` priorities if SETTINGS_NO_RFC7540_PRIORITIES was not * received from client, and server submitted * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * = 1 via `nghttp2_submit_settings()`. Most of the advanced * functionality for RFC 7540 priorities are still disabled. This * fallback only enables the minimal feature set of RFC 7540 * priorities to deal with priority signaling from client. * * Client session ignores this option. */ NGHTTP2_EXTERN void nghttp2_option_set_server_fallback_rfc7540_priorities(nghttp2_option *option, int val); /** * @function * * This option, if set to nonzero, turns off RFC 9113 leading and * trailing white spaces validation against HTTP field value. Some * important fields, such as HTTP/2 pseudo header fields, are * validated more strictly and this option does not apply to them. */ NGHTTP2_EXTERN void nghttp2_option_set_no_rfc9113_leading_and_trailing_ws_validation( nghttp2_option *option, int val); /** * @function * * This function sets the rate limit for the incoming stream reset * (RST_STREAM frame). It is server use only. It is a token-bucket * based rate limiter. |burst| specifies the number of tokens that is * initially available. The maximum number of tokens is capped to * this value. |rate| specifies the number of tokens that are * regenerated per second. An incoming RST_STREAM consumes one token. * If there is no token available, GOAWAY is sent to tear down the * connection. |burst| and |rate| default to 1000 and 33 * respectively. */ NGHTTP2_EXTERN void nghttp2_option_set_stream_reset_rate_limit(nghttp2_option *option, uint64_t burst, uint64_t rate); /** * @function * * This function sets the maximum number of CONTINUATION frames * following an incoming HEADER frame. If more than those frames are * received, the remote endpoint is considered to be misbehaving and * session will be closed. The default value is 8. */ NGHTTP2_EXTERN void nghttp2_option_set_max_continuations(nghttp2_option *option, size_t val); /** * @function * * Initializes |*session_ptr| for client use. The all members of * |callbacks| are copied to |*session_ptr|. Therefore |*session_ptr| * does not store |callbacks|. The |user_data| is an arbitrary user * supplied data, which will be passed to the callback functions. * * The :type:`nghttp2_send_callback2` must be specified. If the * application code uses `nghttp2_session_recv()`, the * :type:`nghttp2_recv_callback` must be specified. The other members * of |callbacks| can be ``NULL``. * * If this function fails, |*session_ptr| is left untouched. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_client_new(nghttp2_session **session_ptr, const nghttp2_session_callbacks *callbacks, void *user_data); /** * @function * * Initializes |*session_ptr| for server use. The all members of * |callbacks| are copied to |*session_ptr|. Therefore |*session_ptr| * does not store |callbacks|. The |user_data| is an arbitrary user * supplied data, which will be passed to the callback functions. * * The :type:`nghttp2_send_callback2` must be specified. If the * application code uses `nghttp2_session_recv()`, the * :type:`nghttp2_recv_callback` must be specified. The other members * of |callbacks| can be ``NULL``. * * If this function fails, |*session_ptr| is left untouched. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_server_new(nghttp2_session **session_ptr, const nghttp2_session_callbacks *callbacks, void *user_data); /** * @function * * Like `nghttp2_session_client_new()`, but with additional options * specified in the |option|. * * The |option| can be ``NULL`` and the call is equivalent to * `nghttp2_session_client_new()`. * * This function does not take ownership |option|. The application is * responsible for freeing |option| if it finishes using the object. * * The library code does not refer to |option| after this function * returns. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_client_new2(nghttp2_session **session_ptr, const nghttp2_session_callbacks *callbacks, void *user_data, const nghttp2_option *option); /** * @function * * Like `nghttp2_session_server_new()`, but with additional options * specified in the |option|. * * The |option| can be ``NULL`` and the call is equivalent to * `nghttp2_session_server_new()`. * * This function does not take ownership |option|. The application is * responsible for freeing |option| if it finishes using the object. * * The library code does not refer to |option| after this function * returns. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_server_new2(nghttp2_session **session_ptr, const nghttp2_session_callbacks *callbacks, void *user_data, const nghttp2_option *option); /** * @function * * Like `nghttp2_session_client_new2()`, but with additional custom * memory allocator specified in the |mem|. * * The |mem| can be ``NULL`` and the call is equivalent to * `nghttp2_session_client_new2()`. * * This function does not take ownership |mem|. The application is * responsible for freeing |mem|. * * The library code does not refer to |mem| pointer after this * function returns, so the application can safely free it. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_client_new3( nghttp2_session **session_ptr, const nghttp2_session_callbacks *callbacks, void *user_data, const nghttp2_option *option, nghttp2_mem *mem); /** * @function * * Like `nghttp2_session_server_new2()`, but with additional custom * memory allocator specified in the |mem|. * * The |mem| can be ``NULL`` and the call is equivalent to * `nghttp2_session_server_new2()`. * * This function does not take ownership |mem|. The application is * responsible for freeing |mem|. * * The library code does not refer to |mem| pointer after this * function returns, so the application can safely free it. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_server_new3( nghttp2_session **session_ptr, const nghttp2_session_callbacks *callbacks, void *user_data, const nghttp2_option *option, nghttp2_mem *mem); /** * @function * * Frees any resources allocated for |session|. If |session| is * ``NULL``, this function does nothing. */ NGHTTP2_EXTERN void nghttp2_session_del(nghttp2_session *session); /** * @function * * Sends pending frames to the remote peer. * * This function retrieves the highest prioritized frame from the * outbound queue and sends it to the remote peer. It does this as * many times as possible until the user callback * :type:`nghttp2_send_callback2` returns * :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`, the outbound queue * becomes empty or flow control is triggered (remote window size * becomes depleted or maximum number of concurrent streams is * reached). This function calls several callback functions which are * passed when initializing the |session|. Here is the simple time * chart which tells when each callback is invoked: * * 1. Get the next frame to send from outbound queue. * * 2. Prepare transmission of the frame. * * 3. If the control frame cannot be sent because some preconditions * are not met (e.g., request HEADERS cannot be sent after GOAWAY), * :type:`nghttp2_on_frame_not_send_callback` is invoked. Abort * the following steps. * * 4. If the frame is HEADERS, PUSH_PROMISE or DATA, * :type:`nghttp2_select_padding_callback` is invoked. * * 5. If the frame is request HEADERS, the stream is opened here. * * 6. :type:`nghttp2_before_frame_send_callback` is invoked. * * 7. If :enum:`nghttp2_error.NGHTTP2_ERR_CANCEL` is returned from * :type:`nghttp2_before_frame_send_callback`, the current frame * transmission is canceled, and * :type:`nghttp2_on_frame_not_send_callback` is invoked. Abort * the following steps. * * 8. :type:`nghttp2_send_callback2` is invoked one or more times to * send the frame. * * 9. :type:`nghttp2_on_frame_send_callback` is invoked. * * 10. If the transmission of the frame triggers closure of the * stream, the stream is closed and * :type:`nghttp2_on_stream_close_callback` is invoked. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` * The callback function failed. */ NGHTTP2_EXTERN int nghttp2_session_send(nghttp2_session *session); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_session_mem_send2()` instead. * * Returns the serialized data to send. * * This function behaves like `nghttp2_session_send()` except that it * does not use :type:`nghttp2_send_callback` to transmit data. * Instead, it assigns the pointer to the serialized data to the * |*data_ptr| and returns its length. The other callbacks are called * in the same way as they are in `nghttp2_session_send()`. * * If no data is available to send, this function returns 0. * * This function may not return all serialized data in one invocation. * To get all data, call this function repeatedly until it returns 0 * or one of negative error codes. * * The assigned |*data_ptr| is valid until the next call of * `nghttp2_session_mem_send()` or `nghttp2_session_send()`. * * The caller must send all data before sending the next chunk of * data. * * This function returns the length of the data pointed by the * |*data_ptr| if it succeeds, or one of the following negative error * codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * * .. note:: * * This function may produce very small byte string. If that is the * case, and application disables Nagle algorithm (``TCP_NODELAY``), * then writing this small chunk leads to very small packet, and it * is very inefficient. An application should be responsible to * buffer up small chunks of data as necessary to avoid this * situation. */ NGHTTP2_EXTERN ssize_t nghttp2_session_mem_send(nghttp2_session *session, const uint8_t **data_ptr); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Returns the serialized data to send. * * This function behaves like `nghttp2_session_send()` except that it * does not use :type:`nghttp2_send_callback2` to transmit data. * Instead, it assigns the pointer to the serialized data to the * |*data_ptr| and returns its length. The other callbacks are called * in the same way as they are in `nghttp2_session_send()`. * * If no data is available to send, this function returns 0. * * This function may not return all serialized data in one invocation. * To get all data, call this function repeatedly until it returns 0 * or one of negative error codes. * * The assigned |*data_ptr| is valid until the next call of * `nghttp2_session_mem_send2()` or `nghttp2_session_send()`. * * The caller must send all data before sending the next chunk of * data. * * This function returns the length of the data pointed by the * |*data_ptr| if it succeeds, or one of the following negative error * codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * * .. note:: * * This function may produce very small byte string. If that is the * case, and application disables Nagle algorithm (``TCP_NODELAY``), * then writing this small chunk leads to very small packet, and it * is very inefficient. An application should be responsible to * buffer up small chunks of data as necessary to avoid this * situation. */ NGHTTP2_EXTERN nghttp2_ssize nghttp2_session_mem_send2(nghttp2_session *session, const uint8_t **data_ptr); /** * @function * * Receives frames from the remote peer. * * This function receives as many frames as possible until the user * callback :type:`nghttp2_recv_callback` returns * :enum:`nghttp2_error.NGHTTP2_ERR_WOULDBLOCK`. This function calls * several callback functions which are passed when initializing the * |session|. Here is the simple time chart which tells when each * callback is invoked: * * 1. :type:`nghttp2_recv_callback` is invoked one or more times to * receive frame header. * * 2. When frame header is received, * :type:`nghttp2_on_begin_frame_callback` is invoked. * * 3. If the frame is DATA frame: * * 1. :type:`nghttp2_recv_callback` is invoked to receive DATA * payload. For each chunk of data, * :type:`nghttp2_on_data_chunk_recv_callback` is invoked. * * 2. If one DATA frame is completely received, * :type:`nghttp2_on_frame_recv_callback` is invoked. If the * reception of the frame triggers the closure of the stream, * :type:`nghttp2_on_stream_close_callback` is invoked. * * 4. If the frame is the control frame: * * 1. :type:`nghttp2_recv_callback` is invoked one or more times to * receive whole frame. * * 2. If the received frame is valid, then following actions are * taken. If the frame is either HEADERS or PUSH_PROMISE, * :type:`nghttp2_on_begin_headers_callback` is invoked. Then * :type:`nghttp2_on_header_callback` is invoked for each header * name/value pair. For invalid header field, * :type:`nghttp2_on_invalid_header_callback` is called. After * all name/value pairs are emitted successfully, * :type:`nghttp2_on_frame_recv_callback` is invoked. For other * frames, :type:`nghttp2_on_frame_recv_callback` is invoked. * If the reception of the frame triggers the closure of the * stream, :type:`nghttp2_on_stream_close_callback` is invoked. * * 3. If the received frame is unpacked but is interpreted as * invalid, :type:`nghttp2_on_invalid_frame_recv_callback` is * invoked. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_EOF` * The remote peer did shutdown on the connection. * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` * The callback function failed. * :enum:`nghttp2_error.NGHTTP2_ERR_BAD_CLIENT_MAGIC` * Invalid client magic was detected. This error only returns * when |session| was configured as server and * `nghttp2_option_set_no_recv_client_magic()` is not used with * nonzero value. * :enum:`nghttp2_error.NGHTTP2_ERR_FLOODED` * Flooding was detected in this HTTP/2 session, and it must be * closed. This is most likely caused by misbehaviour of peer. */ NGHTTP2_EXTERN int nghttp2_session_recv(nghttp2_session *session); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_session_mem_recv2()` instead. * * Processes data |in| as an input from the remote endpoint. The * |inlen| indicates the number of bytes to receive in the |in|. * * This function behaves like `nghttp2_session_recv()` except that it * does not use :type:`nghttp2_recv_callback` to receive data; the * |in| is the only data for the invocation of this function. If all * bytes are processed, this function returns. The other callbacks * are called in the same way as they are in `nghttp2_session_recv()`. * * In the current implementation, this function always tries to * processes |inlen| bytes of input data unless either an error occurs or * :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` is returned from * :type:`nghttp2_on_header_callback` or * :type:`nghttp2_on_data_chunk_recv_callback`. If * :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` is used, the return value * includes the number of bytes which was used to produce the data or * frame for the callback. * * This function returns the number of processed bytes, or one of the * following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` * The callback function failed. * :enum:`nghttp2_error.NGHTTP2_ERR_BAD_CLIENT_MAGIC` * Invalid client magic was detected. This error only returns * when |session| was configured as server and * `nghttp2_option_set_no_recv_client_magic()` is not used with * nonzero value. * :enum:`nghttp2_error.NGHTTP2_ERR_FLOODED` * Flooding was detected in this HTTP/2 session, and it must be * closed. This is most likely caused by misbehaviour of peer. */ NGHTTP2_EXTERN ssize_t nghttp2_session_mem_recv(nghttp2_session *session, const uint8_t *in, size_t inlen); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Processes data |in| as an input from the remote endpoint. The * |inlen| indicates the number of bytes to receive in the |in|. * * This function behaves like `nghttp2_session_recv()` except that it * does not use :type:`nghttp2_recv_callback` to receive data; the * |in| is the only data for the invocation of this function. If all * bytes are processed, this function returns. The other callbacks * are called in the same way as they are in `nghttp2_session_recv()`. * * In the current implementation, this function always tries to * processes |inlen| bytes of input data unless either an error occurs or * :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` is returned from * :type:`nghttp2_on_header_callback` or * :type:`nghttp2_on_data_chunk_recv_callback`. If * :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` is used, the return value * includes the number of bytes which was used to produce the data or * frame for the callback. * * This function returns the number of processed bytes, or one of the * following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE` * The callback function failed. * :enum:`nghttp2_error.NGHTTP2_ERR_BAD_CLIENT_MAGIC` * Invalid client magic was detected. This error only returns * when |session| was configured as server and * `nghttp2_option_set_no_recv_client_magic()` is not used with * nonzero value. * :enum:`nghttp2_error.NGHTTP2_ERR_FLOODED` * Flooding was detected in this HTTP/2 session, and it must be * closed. This is most likely caused by misbehaviour of peer. */ NGHTTP2_EXTERN nghttp2_ssize nghttp2_session_mem_recv2(nghttp2_session *session, const uint8_t *in, size_t inlen); /** * @function * * Puts back previously deferred DATA frame in the stream |stream_id| * to the outbound queue. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The stream does not exist; or no deferred data exist. * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_resume_data(nghttp2_session *session, int32_t stream_id); /** * @function * * Returns nonzero value if |session| wants to receive data from the * remote peer. * * If both `nghttp2_session_want_read()` and * `nghttp2_session_want_write()` return 0, the application should * drop the connection. */ NGHTTP2_EXTERN int nghttp2_session_want_read(nghttp2_session *session); /** * @function * * Returns nonzero value if |session| wants to send data to the remote * peer. * * If both `nghttp2_session_want_read()` and * `nghttp2_session_want_write()` return 0, the application should * drop the connection. */ NGHTTP2_EXTERN int nghttp2_session_want_write(nghttp2_session *session); /** * @function * * Returns stream_user_data for the stream |stream_id|. The * stream_user_data is provided by `nghttp2_submit_request2()`, * `nghttp2_submit_headers()` or * `nghttp2_session_set_stream_user_data()`. Unless it is set using * `nghttp2_session_set_stream_user_data()`, if the stream is * initiated by the remote endpoint, stream_user_data is always * ``NULL``. If the stream does not exist, this function returns * ``NULL``. */ NGHTTP2_EXTERN void * nghttp2_session_get_stream_user_data(nghttp2_session *session, int32_t stream_id); /** * @function * * Sets the |stream_user_data| to the stream denoted by the * |stream_id|. If a stream user data is already set to the stream, * it is replaced with the |stream_user_data|. It is valid to specify * ``NULL`` in the |stream_user_data|, which nullifies the associated * data pointer. * * It is valid to set the |stream_user_data| to the stream reserved by * PUSH_PROMISE frame. * * This function returns 0 if it succeeds, or one of following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The stream does not exist */ NGHTTP2_EXTERN int nghttp2_session_set_stream_user_data(nghttp2_session *session, int32_t stream_id, void *stream_user_data); /** * @function * * Sets |user_data| to |session|, overwriting the existing user data * specified in `nghttp2_session_client_new()`, or * `nghttp2_session_server_new()`. */ NGHTTP2_EXTERN void nghttp2_session_set_user_data(nghttp2_session *session, void *user_data); /** * @function * * Returns the number of frames in the outbound queue. This does not * include the deferred DATA frames. */ NGHTTP2_EXTERN size_t nghttp2_session_get_outbound_queue_size(nghttp2_session *session); /** * @function * * Returns the number of DATA payload in bytes received without * WINDOW_UPDATE transmission for the stream |stream_id|. The local * (receive) window size can be adjusted by * `nghttp2_submit_window_update()`. This function takes into account * that and returns effective data length. In particular, if the * local window size is reduced by submitting negative * window_size_increment with `nghttp2_submit_window_update()`, this * function returns the number of bytes less than actually received. * * This function returns -1 if it fails. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_stream_effective_recv_data_length( nghttp2_session *session, int32_t stream_id); /** * @function * * Returns the local (receive) window size for the stream |stream_id|. * The local window size can be adjusted by * `nghttp2_submit_window_update()`. This function takes into account * that and returns effective window size. * * This function does not take into account the amount of received * data from the remote endpoint. Use * `nghttp2_session_get_stream_local_window_size()` to know the amount * of data the remote endpoint can send without receiving stream level * WINDOW_UPDATE frame. Note that each stream is still subject to the * connection level flow control. * * This function returns -1 if it fails. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_stream_effective_local_window_size( nghttp2_session *session, int32_t stream_id); /** * @function * * Returns the amount of flow-controlled payload (e.g., DATA) that the * remote endpoint can send without receiving stream level * WINDOW_UPDATE frame. It is also subject to the connection level * flow control. So the actual amount of data to send is * min(`nghttp2_session_get_stream_local_window_size()`, * `nghttp2_session_get_local_window_size()`). * * This function returns -1 if it fails. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_stream_local_window_size( nghttp2_session *session, int32_t stream_id); /** * @function * * Returns the number of DATA payload in bytes received without * WINDOW_UPDATE transmission for a connection. The local (receive) * window size can be adjusted by `nghttp2_submit_window_update()`. * This function takes into account that and returns effective data * length. In particular, if the local window size is reduced by * submitting negative window_size_increment with * `nghttp2_submit_window_update()`, this function returns the number * of bytes less than actually received. * * This function returns -1 if it fails. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_effective_recv_data_length(nghttp2_session *session); /** * @function * * Returns the local (receive) window size for a connection. The * local window size can be adjusted by * `nghttp2_submit_window_update()`. This function takes into account * that and returns effective window size. * * This function does not take into account the amount of received * data from the remote endpoint. Use * `nghttp2_session_get_local_window_size()` to know the amount of * data the remote endpoint can send without receiving * connection-level WINDOW_UPDATE frame. Note that each stream is * still subject to the stream level flow control. * * This function returns -1 if it fails. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_effective_local_window_size(nghttp2_session *session); /** * @function * * Returns the amount of flow-controlled payload (e.g., DATA) that the * remote endpoint can send without receiving connection level * WINDOW_UPDATE frame. Note that each stream is still subject to the * stream level flow control (see * `nghttp2_session_get_stream_local_window_size()`). * * This function returns -1 if it fails. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_local_window_size(nghttp2_session *session); /** * @function * * Returns the remote window size for a given stream |stream_id|. * * This is the amount of flow-controlled payload (e.g., DATA) that the * local endpoint can send without stream level WINDOW_UPDATE. There * is also connection level flow control, so the effective size of * payload that the local endpoint can actually send is * min(`nghttp2_session_get_stream_remote_window_size()`, * `nghttp2_session_get_remote_window_size()`). * * This function returns -1 if it fails. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_stream_remote_window_size( nghttp2_session *session, int32_t stream_id); /** * @function * * Returns the remote window size for a connection. * * This function always succeeds. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_remote_window_size(nghttp2_session *session); /** * @function * * Returns 1 if local peer half closed the given stream |stream_id|. * Returns 0 if it did not. Returns -1 if no such stream exists. */ NGHTTP2_EXTERN int nghttp2_session_get_stream_local_close(nghttp2_session *session, int32_t stream_id); /** * @function * * Returns 1 if remote peer half closed the given stream |stream_id|. * Returns 0 if it did not. Returns -1 if no such stream exists. */ NGHTTP2_EXTERN int nghttp2_session_get_stream_remote_close(nghttp2_session *session, int32_t stream_id); /** * @function * * Returns the current dynamic table size of HPACK inflater, including * the overhead 32 bytes per entry described in RFC 7541. */ NGHTTP2_EXTERN size_t nghttp2_session_get_hd_inflate_dynamic_table_size(nghttp2_session *session); /** * @function * * Returns the current dynamic table size of HPACK deflater including * the overhead 32 bytes per entry described in RFC 7541. */ NGHTTP2_EXTERN size_t nghttp2_session_get_hd_deflate_dynamic_table_size(nghttp2_session *session); /** * @function * * Signals the session so that the connection should be terminated. * * The last stream ID is the minimum value between the stream ID of a * stream for which :type:`nghttp2_on_frame_recv_callback` was called * most recently and the last stream ID we have sent to the peer * previously. * * The |error_code| is the error code of this GOAWAY frame. The * pre-defined error code is one of :enum:`nghttp2_error_code`. * * After the transmission, both `nghttp2_session_want_read()` and * `nghttp2_session_want_write()` return 0. * * This function should be called when the connection should be * terminated after sending GOAWAY. If the remaining streams should * be processed after GOAWAY, use `nghttp2_submit_goaway()` instead. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_terminate_session(nghttp2_session *session, uint32_t error_code); /** * @function * * Signals the session so that the connection should be terminated. * * This function behaves like `nghttp2_session_terminate_session()`, * but the last stream ID can be specified by the application for fine * grained control of stream. The HTTP/2 specification does not allow * last_stream_id to be increased. So the actual value sent as * last_stream_id is the minimum value between the given * |last_stream_id| and the last_stream_id we have previously sent to * the peer. * * The |last_stream_id| is peer's stream ID or 0. So if |session| is * initialized as client, |last_stream_id| must be even or 0. If * |session| is initialized as server, |last_stream_id| must be odd or * 0. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |last_stream_id| is invalid. */ NGHTTP2_EXTERN int nghttp2_session_terminate_session2(nghttp2_session *session, int32_t last_stream_id, uint32_t error_code); /** * @function * * Signals to the client that the server started graceful shutdown * procedure. * * This function is only usable for server. If this function is * called with client side session, this function returns * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE`. * * To gracefully shutdown HTTP/2 session, server should call this * function to send GOAWAY with last_stream_id (1u << 31) - 1. And * after some delay (e.g., 1 RTT), send another GOAWAY with the stream * ID that the server has some processing using * `nghttp2_submit_goaway()`. See also * `nghttp2_session_get_last_proc_stream_id()`. * * Unlike `nghttp2_submit_goaway()`, this function just sends GOAWAY * and does nothing more. This is a mere indication to the client * that session shutdown is imminent. The application should call * `nghttp2_submit_goaway()` with appropriate last_stream_id after * this call. * * If one or more GOAWAY frame have been already sent by either * `nghttp2_submit_goaway()` or `nghttp2_session_terminate_session()`, * this function has no effect. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * The |session| is initialized as client. */ NGHTTP2_EXTERN int nghttp2_submit_shutdown_notice(nghttp2_session *session); /** * @function * * Returns the value of SETTINGS |id| notified by a remote endpoint. * The |id| must be one of values defined in * :enum:`nghttp2_settings_id`. */ NGHTTP2_EXTERN uint32_t nghttp2_session_get_remote_settings( nghttp2_session *session, nghttp2_settings_id id); /** * @function * * Returns the value of SETTINGS |id| of local endpoint acknowledged * by the remote endpoint. The |id| must be one of the values defined * in :enum:`nghttp2_settings_id`. */ NGHTTP2_EXTERN uint32_t nghttp2_session_get_local_settings( nghttp2_session *session, nghttp2_settings_id id); /** * @function * * Tells the |session| that next stream ID is |next_stream_id|. The * |next_stream_id| must be equal or greater than the value returned * by `nghttp2_session_get_next_stream_id()`. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |next_stream_id| is strictly less than the value * `nghttp2_session_get_next_stream_id()` returns; or * |next_stream_id| is invalid (e.g., even integer for client, or * odd integer for server). */ NGHTTP2_EXTERN int nghttp2_session_set_next_stream_id(nghttp2_session *session, int32_t next_stream_id); /** * @function * * Returns the next outgoing stream ID. Notice that return type is * uint32_t. If we run out of stream ID for this session, this * function returns 1 << 31. */ NGHTTP2_EXTERN uint32_t nghttp2_session_get_next_stream_id(nghttp2_session *session); /** * @function * * Tells the |session| that |size| bytes for a stream denoted by * |stream_id| were consumed by application and are ready to * WINDOW_UPDATE. The consumed bytes are counted towards both * connection and stream level WINDOW_UPDATE (see * `nghttp2_session_consume_connection()` and * `nghttp2_session_consume_stream()` to update consumption * independently). This function is intended to be used without * automatic window update (see * `nghttp2_option_set_no_auto_window_update()`). * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * Automatic WINDOW_UPDATE is not disabled. */ NGHTTP2_EXTERN int nghttp2_session_consume(nghttp2_session *session, int32_t stream_id, size_t size); /** * @function * * Like `nghttp2_session_consume()`, but this only tells library that * |size| bytes were consumed only for connection level. Note that * HTTP/2 maintains connection and stream level flow control windows * independently. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * Automatic WINDOW_UPDATE is not disabled. */ NGHTTP2_EXTERN int nghttp2_session_consume_connection(nghttp2_session *session, size_t size); /** * @function * * Like `nghttp2_session_consume()`, but this only tells library that * |size| bytes were consumed only for stream denoted by |stream_id|. * Note that HTTP/2 maintains connection and stream level flow control * windows independently. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * Automatic WINDOW_UPDATE is not disabled. */ NGHTTP2_EXTERN int nghttp2_session_consume_stream(nghttp2_session *session, int32_t stream_id, size_t size); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return 0 without doing anything. * * Changes priority of existing stream denoted by |stream_id|. The * new priority specification is |pri_spec|. * * The priority is changed silently and instantly, and no PRIORITY * frame will be sent to notify the peer of this change. This * function may be useful for server to change the priority of pushed * stream. * * If |session| is initialized as server, and ``pri_spec->stream_id`` * points to the idle stream, the idle stream is created if it does * not exist. The created idle stream will depend on root stream * (stream 0) with weight 16. * * Otherwise, if stream denoted by ``pri_spec->stream_id`` is not * found, we use default priority instead of given |pri_spec|. That * is make stream depend on root stream with weight 16. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is submitted via `nghttp2_submit_settings()`, this * function does nothing and returns 0. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * Attempted to depend on itself; or no stream exist for the given * |stream_id|; or |stream_id| is 0 */ NGHTTP2_EXTERN int nghttp2_session_change_stream_priority(nghttp2_session *session, int32_t stream_id, const nghttp2_priority_spec *pri_spec); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return 0 without doing anything. * * Creates idle stream with the given |stream_id|, and priority * |pri_spec|. * * The stream creation is done without sending PRIORITY frame, which * means that peer does not know about the existence of this idle * stream in the local endpoint. * * RFC 7540 does not disallow the use of creation of idle stream with * odd or even stream ID regardless of client or server. So this * function can create odd or even stream ID regardless of client or * server. But probably it is a bit safer to use the stream ID the * local endpoint can initiate (in other words, use odd stream ID for * client, and even stream ID for server), to avoid potential * collision from peer's instruction. Also we can use * `nghttp2_session_set_next_stream_id()` to avoid to open created * idle streams accidentally if we follow this recommendation. * * If |session| is initialized as server, and ``pri_spec->stream_id`` * points to the idle stream, the idle stream is created if it does * not exist. The created idle stream will depend on root stream * (stream 0) with weight 16. * * Otherwise, if stream denoted by ``pri_spec->stream_id`` is not * found, we use default priority instead of given |pri_spec|. That * is make stream depend on root stream with weight 16. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is submitted via `nghttp2_submit_settings()`, this * function does nothing and returns 0. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * Attempted to depend on itself; or stream denoted by |stream_id| * already exists; or |stream_id| cannot be used to create idle * stream (in other words, local endpoint has already opened * stream ID greater than or equal to the given stream ID; or * |stream_id| is 0 */ NGHTTP2_EXTERN int nghttp2_session_create_idle_stream(nghttp2_session *session, int32_t stream_id, const nghttp2_priority_spec *pri_spec); /** * @function * * .. warning:: * * This function is deprecated in favor of * `nghttp2_session_upgrade2()`, because this function lacks the * parameter to tell the library the request method used in the * original HTTP request. This information is required for client * to validate actual response body length against content-length * header field (see `nghttp2_option_set_no_http_messaging()`). If * HEAD is used in request, the length of response body must be 0 * regardless of value included in content-length header field. * * Performs post-process of HTTP Upgrade request. This function can * be called from both client and server, but the behavior is very * different in each other. * * If called from client side, the |settings_payload| must be the * value sent in ``HTTP2-Settings`` header field and must be decoded * by base64url decoder. The |settings_payloadlen| is the length of * |settings_payload|. The |settings_payload| is unpacked and its * setting values will be submitted using `nghttp2_submit_settings()`. * This means that the client application code does not need to submit * SETTINGS by itself. The stream with stream ID=1 is opened and the * |stream_user_data| is used for its stream_user_data. The opened * stream becomes half-closed (local) state. * * If called from server side, the |settings_payload| must be the * value received in ``HTTP2-Settings`` header field and must be * decoded by base64url decoder. The |settings_payloadlen| is the * length of |settings_payload|. It is treated as if the SETTINGS * frame with that payload is received. Thus, callback functions for * the reception of SETTINGS frame will be invoked. The stream with * stream ID=1 is opened. The |stream_user_data| is ignored. The * opened stream becomes half-closed (remote). * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |settings_payload| is badly formed. * :enum:`nghttp2_error.NGHTTP2_ERR_PROTO` * The stream ID 1 is already used or closed; or is not available. */ NGHTTP2_EXTERN int nghttp2_session_upgrade(nghttp2_session *session, const uint8_t *settings_payload, size_t settings_payloadlen, void *stream_user_data); /** * @function * * Performs post-process of HTTP Upgrade request. This function can * be called from both client and server, but the behavior is very * different in each other. * * If called from client side, the |settings_payload| must be the * value sent in ``HTTP2-Settings`` header field and must be decoded * by base64url decoder. The |settings_payloadlen| is the length of * |settings_payload|. The |settings_payload| is unpacked and its * setting values will be submitted using `nghttp2_submit_settings()`. * This means that the client application code does not need to submit * SETTINGS by itself. The stream with stream ID=1 is opened and the * |stream_user_data| is used for its stream_user_data. The opened * stream becomes half-closed (local) state. * * If called from server side, the |settings_payload| must be the * value received in ``HTTP2-Settings`` header field and must be * decoded by base64url decoder. The |settings_payloadlen| is the * length of |settings_payload|. It is treated as if the SETTINGS * frame with that payload is received. Thus, callback functions for * the reception of SETTINGS frame will be invoked. The stream with * stream ID=1 is opened. The |stream_user_data| is ignored. The * opened stream becomes half-closed (remote). * * If the request method is HEAD, pass nonzero value to * |head_request|. Otherwise, pass 0. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |settings_payload| is badly formed. * :enum:`nghttp2_error.NGHTTP2_ERR_PROTO` * The stream ID 1 is already used or closed; or is not available. */ NGHTTP2_EXTERN int nghttp2_session_upgrade2(nghttp2_session *session, const uint8_t *settings_payload, size_t settings_payloadlen, int head_request, void *stream_user_data); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_pack_settings_payload2()` instead. * * Serializes the SETTINGS values |iv| in the |buf|. The size of the * |buf| is specified by |buflen|. The number of entries in the |iv| * array is given by |niv|. The required space in |buf| for the |niv| * entries is ``6*niv`` bytes and if the given buffer is too small, an * error is returned. This function is used mainly for creating a * SETTINGS payload to be sent with the ``HTTP2-Settings`` header * field in an HTTP Upgrade request. The data written in |buf| is NOT * base64url encoded and the application is responsible for encoding. * * This function returns the number of bytes written in |buf|, or one * of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |iv| contains duplicate settings ID or invalid value. * * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE` * The provided |buflen| size is too small to hold the output. */ NGHTTP2_EXTERN ssize_t nghttp2_pack_settings_payload( uint8_t *buf, size_t buflen, const nghttp2_settings_entry *iv, size_t niv); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Serializes the SETTINGS values |iv| in the |buf|. The size of the * |buf| is specified by |buflen|. The number of entries in the |iv| * array is given by |niv|. The required space in |buf| for the |niv| * entries is ``6*niv`` bytes and if the given buffer is too small, an * error is returned. This function is used mainly for creating a * SETTINGS payload to be sent with the ``HTTP2-Settings`` header * field in an HTTP Upgrade request. The data written in |buf| is NOT * base64url encoded and the application is responsible for encoding. * * This function returns the number of bytes written in |buf|, or one * of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |iv| contains duplicate settings ID or invalid value. * * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE` * The provided |buflen| size is too small to hold the output. */ NGHTTP2_EXTERN nghttp2_ssize nghttp2_pack_settings_payload2( uint8_t *buf, size_t buflen, const nghttp2_settings_entry *iv, size_t niv); /** * @function * * Returns string describing the |lib_error_code|. The * |lib_error_code| must be one of the :enum:`nghttp2_error`. */ NGHTTP2_EXTERN const char *nghttp2_strerror(int lib_error_code); /** * @function * * Returns string representation of HTTP/2 error code |error_code| * (e.g., ``PROTOCOL_ERROR`` is returned if ``error_code == * NGHTTP2_PROTOCOL_ERROR``). If string representation is unknown for * given |error_code|, this function returns string ``unknown``. */ NGHTTP2_EXTERN const char *nghttp2_http2_strerror(uint32_t error_code); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * Initializes |pri_spec| with the |stream_id| of the stream to depend * on with |weight| and its exclusive flag. If |exclusive| is * nonzero, exclusive flag is set. * * The |weight| must be in [:macro:`NGHTTP2_MIN_WEIGHT`, * :macro:`NGHTTP2_MAX_WEIGHT`], inclusive. */ NGHTTP2_EXTERN void nghttp2_priority_spec_init(nghttp2_priority_spec *pri_spec, int32_t stream_id, int32_t weight, int exclusive); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * Initializes |pri_spec| with the default values. The default values * are: stream_id = 0, weight = :macro:`NGHTTP2_DEFAULT_WEIGHT` and * exclusive = 0. */ NGHTTP2_EXTERN void nghttp2_priority_spec_default_init(nghttp2_priority_spec *pri_spec); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * Returns nonzero if the |pri_spec| is filled with default values. */ NGHTTP2_EXTERN int nghttp2_priority_spec_check_default(const nghttp2_priority_spec *pri_spec); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_submit_request2()` instead. * * Submits HEADERS frame and optionally one or more DATA frames. * * The |pri_spec| is a deprecated priority specification of this * request. ``NULL`` means the default priority (see * `nghttp2_priority_spec_default_init()`). To specify the priority, * use `nghttp2_priority_spec_init()`. If |pri_spec| is not ``NULL``, * this function will copy its data members. * * The ``pri_spec->weight`` must be in [:macro:`NGHTTP2_MIN_WEIGHT`, * :macro:`NGHTTP2_MAX_WEIGHT`], inclusive. If ``pri_spec->weight`` * is strictly less than :macro:`NGHTTP2_MIN_WEIGHT`, it becomes * :macro:`NGHTTP2_MIN_WEIGHT`. If it is strictly greater than * :macro:`NGHTTP2_MAX_WEIGHT`, it becomes * :macro:`NGHTTP2_MAX_WEIGHT`. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is received by a remote endpoint, |pri_spec| is * ignored, and treated as if ``NULL`` is specified. * * The |nva| is an array of name/value pair :type:`nghttp2_nv` with * |nvlen| elements. The application is responsible to include * required pseudo-header fields (header field whose name starts with * ":") in |nva| and must place pseudo-headers before regular header * fields. * * This function creates copies of all name/value pairs in |nva|. It * also lower-cases all names in |nva|. The order of elements in * |nva| is preserved. For header fields with * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME` and * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE` are set, * header field name and value are not copied respectively. With * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`, application * is responsible to pass header field name in lowercase. The * application should maintain the references to them until * :type:`nghttp2_on_frame_send_callback` or * :type:`nghttp2_on_frame_not_send_callback` is called. * * HTTP/2 specification has requirement about header fields in the * request HEADERS. See the specification for more details. * * If |data_prd| is not ``NULL``, it provides data which will be sent * in subsequent DATA frames. In this case, a method that allows * request message bodies * (https://tools.ietf.org/html/rfc7231#section-4) must be specified * with ``:method`` key in |nva| (e.g. ``POST``). This function does * not take ownership of the |data_prd|. The function copies the * members of the |data_prd|. If |data_prd| is ``NULL``, HEADERS have * END_STREAM set. The |stream_user_data| is data associated to the * stream opened by this request and can be an arbitrary pointer, * which can be retrieved later by * `nghttp2_session_get_stream_user_data()`. * * This function returns assigned stream ID if it succeeds, or one of * the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE` * No stream ID is available because maximum stream ID was * reached. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * Trying to depend on itself (new stream ID equals * ``pri_spec->stream_id``). * :enum:`nghttp2_error.NGHTTP2_ERR_PROTO` * The |session| is server session. * * .. warning:: * * This function returns assigned stream ID if it succeeds. But * that stream is not created yet. The application must not submit * frame to that stream ID before * :type:`nghttp2_before_frame_send_callback` is called for this * frame. This means `nghttp2_session_get_stream_user_data()` does * not work before the callback. But * `nghttp2_session_set_stream_user_data()` handles this situation * specially, and it can set data to a stream during this period. * */ NGHTTP2_EXTERN int32_t nghttp2_submit_request( nghttp2_session *session, const nghttp2_priority_spec *pri_spec, const nghttp2_nv *nva, size_t nvlen, const nghttp2_data_provider *data_prd, void *stream_user_data); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Submits HEADERS frame and optionally one or more DATA frames. * * The |pri_spec| is a deprecated priority specification of this * request. ``NULL`` means the default priority (see * `nghttp2_priority_spec_default_init()`). To specify the priority, * use `nghttp2_priority_spec_init()`. If |pri_spec| is not ``NULL``, * this function will copy its data members. In the future release * after the end of 2024, this function will ignore |pri_spec| and * behave as if ``NULL`` is given. * * The ``pri_spec->weight`` must be in [:macro:`NGHTTP2_MIN_WEIGHT`, * :macro:`NGHTTP2_MAX_WEIGHT`], inclusive. If ``pri_spec->weight`` * is strictly less than :macro:`NGHTTP2_MIN_WEIGHT`, it becomes * :macro:`NGHTTP2_MIN_WEIGHT`. If it is strictly greater than * :macro:`NGHTTP2_MAX_WEIGHT`, it becomes * :macro:`NGHTTP2_MAX_WEIGHT`. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is received by a remote endpoint, |pri_spec| is * ignored, and treated as if ``NULL`` is specified. * * The |nva| is an array of name/value pair :type:`nghttp2_nv` with * |nvlen| elements. The application is responsible to include * required pseudo-header fields (header field whose name starts with * ":") in |nva| and must place pseudo-headers before regular header * fields. * * This function creates copies of all name/value pairs in |nva|. It * also lower-cases all names in |nva|. The order of elements in * |nva| is preserved. For header fields with * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME` and * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE` are set, * header field name and value are not copied respectively. With * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`, application * is responsible to pass header field name in lowercase. The * application should maintain the references to them until * :type:`nghttp2_on_frame_send_callback` or * :type:`nghttp2_on_frame_not_send_callback` is called. * * HTTP/2 specification has requirement about header fields in the * request HEADERS. See the specification for more details. * * If |data_prd| is not ``NULL``, it provides data which will be sent * in subsequent DATA frames. In this case, a method that allows * request message bodies * (https://tools.ietf.org/html/rfc7231#section-4) must be specified * with ``:method`` key in |nva| (e.g. ``POST``). This function does * not take ownership of the |data_prd|. The function copies the * members of the |data_prd|. If |data_prd| is ``NULL``, HEADERS have * END_STREAM set. The |stream_user_data| is data associated to the * stream opened by this request and can be an arbitrary pointer, * which can be retrieved later by * `nghttp2_session_get_stream_user_data()`. * * This function returns assigned stream ID if it succeeds, or one of * the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE` * No stream ID is available because maximum stream ID was * reached. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * Trying to depend on itself (new stream ID equals * ``pri_spec->stream_id``). * :enum:`nghttp2_error.NGHTTP2_ERR_PROTO` * The |session| is server session. * * .. warning:: * * This function returns assigned stream ID if it succeeds. But * that stream is not created yet. The application must not submit * frame to that stream ID before * :type:`nghttp2_before_frame_send_callback` is called for this * frame. This means `nghttp2_session_get_stream_user_data()` does * not work before the callback. But * `nghttp2_session_set_stream_user_data()` handles this situation * specially, and it can set data to a stream during this period. * */ NGHTTP2_EXTERN int32_t nghttp2_submit_request2( nghttp2_session *session, const nghttp2_priority_spec *pri_spec, const nghttp2_nv *nva, size_t nvlen, const nghttp2_data_provider2 *data_prd, void *stream_user_data); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_submit_response2()` instead. * * Submits response HEADERS frame and optionally one or more DATA * frames against the stream |stream_id|. * * The |nva| is an array of name/value pair :type:`nghttp2_nv` with * |nvlen| elements. The application is responsible to include * required pseudo-header fields (header field whose name starts with * ":") in |nva| and must place pseudo-headers before regular header * fields. * * This function creates copies of all name/value pairs in |nva|. It * also lower-cases all names in |nva|. The order of elements in * |nva| is preserved. For header fields with * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME` and * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE` are set, * header field name and value are not copied respectively. With * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`, application * is responsible to pass header field name in lowercase. The * application should maintain the references to them until * :type:`nghttp2_on_frame_send_callback` or * :type:`nghttp2_on_frame_not_send_callback` is called. * * HTTP/2 specification has requirement about header fields in the * response HEADERS. See the specification for more details. * * If |data_prd| is not ``NULL``, it provides data which will be sent * in subsequent DATA frames. This function does not take ownership * of the |data_prd|. The function copies the members of the * |data_prd|. If |data_prd| is ``NULL``, HEADERS will have * END_STREAM flag set. * * This method can be used as normal HTTP response and push response. * When pushing a resource using this function, the |session| must be * configured using `nghttp2_session_server_new()` or its variants and * the target stream denoted by the |stream_id| must be reserved using * `nghttp2_submit_push_promise()`. * * To send non-final response headers (e.g., HTTP status 101), don't * use this function because this function half-closes the outbound * stream. Instead, use `nghttp2_submit_headers()` for this purpose. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0. * :enum:`nghttp2_error.NGHTTP2_ERR_DATA_EXIST` * DATA or HEADERS has been already submitted and not fully * processed yet. Normally, this does not happen, but when * application wrongly calls `nghttp2_submit_response()` twice, * this may happen. * :enum:`nghttp2_error.NGHTTP2_ERR_PROTO` * The |session| is client session. * * .. warning:: * * Calling this function twice for the same stream ID may lead to * program crash. It is generally considered to a programming error * to commit response twice. */ NGHTTP2_EXTERN int nghttp2_submit_response(nghttp2_session *session, int32_t stream_id, const nghttp2_nv *nva, size_t nvlen, const nghttp2_data_provider *data_prd); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Submits response HEADERS frame and optionally one or more DATA * frames against the stream |stream_id|. * * The |nva| is an array of name/value pair :type:`nghttp2_nv` with * |nvlen| elements. The application is responsible to include * required pseudo-header fields (header field whose name starts with * ":") in |nva| and must place pseudo-headers before regular header * fields. * * This function creates copies of all name/value pairs in |nva|. It * also lower-cases all names in |nva|. The order of elements in * |nva| is preserved. For header fields with * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME` and * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE` are set, * header field name and value are not copied respectively. With * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`, application * is responsible to pass header field name in lowercase. The * application should maintain the references to them until * :type:`nghttp2_on_frame_send_callback` or * :type:`nghttp2_on_frame_not_send_callback` is called. * * HTTP/2 specification has requirement about header fields in the * response HEADERS. See the specification for more details. * * If |data_prd| is not ``NULL``, it provides data which will be sent * in subsequent DATA frames. This function does not take ownership * of the |data_prd|. The function copies the members of the * |data_prd|. If |data_prd| is ``NULL``, HEADERS will have * END_STREAM flag set. * * This method can be used as normal HTTP response and push response. * When pushing a resource using this function, the |session| must be * configured using `nghttp2_session_server_new()` or its variants and * the target stream denoted by the |stream_id| must be reserved using * `nghttp2_submit_push_promise()`. * * To send non-final response headers (e.g., HTTP status 101), don't * use this function because this function half-closes the outbound * stream. Instead, use `nghttp2_submit_headers()` for this purpose. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0. * :enum:`nghttp2_error.NGHTTP2_ERR_DATA_EXIST` * DATA or HEADERS has been already submitted and not fully * processed yet. Normally, this does not happen, but when * application wrongly calls `nghttp2_submit_response2()` twice, * this may happen. * :enum:`nghttp2_error.NGHTTP2_ERR_PROTO` * The |session| is client session. * * .. warning:: * * Calling this function twice for the same stream ID may lead to * program crash. It is generally considered to a programming error * to commit response twice. */ NGHTTP2_EXTERN int nghttp2_submit_response2(nghttp2_session *session, int32_t stream_id, const nghttp2_nv *nva, size_t nvlen, const nghttp2_data_provider2 *data_prd); /** * @function * * Submits trailer fields HEADERS against the stream |stream_id|. * * The |nva| is an array of name/value pair :type:`nghttp2_nv` with * |nvlen| elements. The application must not include pseudo-header * fields (headers whose names starts with ":") in |nva|. * * This function creates copies of all name/value pairs in |nva|. It * also lower-cases all names in |nva|. The order of elements in * |nva| is preserved. For header fields with * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME` and * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE` are set, * header field name and value are not copied respectively. With * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`, application * is responsible to pass header field name in lowercase. The * application should maintain the references to them until * :type:`nghttp2_on_frame_send_callback` or * :type:`nghttp2_on_frame_not_send_callback` is called. * * For server, trailer fields must follow response HEADERS or response * DATA without END_STREAM flat set. The library does not enforce * this requirement, and applications should do this for themselves. * If `nghttp2_submit_trailer()` is called before any response HEADERS * submission (usually by `nghttp2_submit_response2()`), the content * of |nva| will be sent as response headers, which will result in * error. * * This function has the same effect with `nghttp2_submit_headers()`, * with flags = :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM` and both * pri_spec and stream_user_data to NULL. * * To submit trailer fields after `nghttp2_submit_response2()` is * called, the application has to specify * :type:`nghttp2_data_provider2` to `nghttp2_submit_response2()`. * Inside of :type:`nghttp2_data_source_read_callback2`, when setting * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_EOF`, also set * :enum:`nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_END_STREAM`. After * that, the application can send trailer fields using * `nghttp2_submit_trailer()`. `nghttp2_submit_trailer()` can be used * inside :type:`nghttp2_data_source_read_callback2`. * * This function returns 0 if it succeeds and |stream_id| is -1. * Otherwise, this function returns 0 if it succeeds, or one of the * following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0. */ NGHTTP2_EXTERN int nghttp2_submit_trailer(nghttp2_session *session, int32_t stream_id, const nghttp2_nv *nva, size_t nvlen); /** * @function * * Submits HEADERS frame. The |flags| is bitwise OR of the * following values: * * * :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM` * * If |flags| includes :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM`, * this frame has END_STREAM flag set. * * The library handles the CONTINUATION frame internally and it * correctly sets END_HEADERS to the last sequence of the PUSH_PROMISE * or CONTINUATION frame. * * If the |stream_id| is -1, this frame is assumed as request (i.e., * request HEADERS frame which opens new stream). In this case, the * assigned stream ID will be returned. Otherwise, specify stream ID * in |stream_id|. * * The |pri_spec| is a deprecated priority specification of this * request. ``NULL`` means the default priority (see * `nghttp2_priority_spec_default_init()`). To specify the priority, * use `nghttp2_priority_spec_init()`. If |pri_spec| is not ``NULL``, * this function will copy its data members. In the future release * after the end of 2024, this function will ignore |pri_spec| and * behave as if ``NULL`` is given. * * The ``pri_spec->weight`` must be in [:macro:`NGHTTP2_MIN_WEIGHT`, * :macro:`NGHTTP2_MAX_WEIGHT`], inclusive. If ``pri_spec->weight`` * is strictly less than :macro:`NGHTTP2_MIN_WEIGHT`, it becomes * :macro:`NGHTTP2_MIN_WEIGHT`. If it is strictly greater than * :macro:`NGHTTP2_MAX_WEIGHT`, it becomes :macro:`NGHTTP2_MAX_WEIGHT`. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is received by a remote endpoint, |pri_spec| is * ignored, and treated as if ``NULL`` is specified. * * The |nva| is an array of name/value pair :type:`nghttp2_nv` with * |nvlen| elements. The application is responsible to include * required pseudo-header fields (header field whose name starts with * ":") in |nva| and must place pseudo-headers before regular header * fields. * * This function creates copies of all name/value pairs in |nva|. It * also lower-cases all names in |nva|. The order of elements in * |nva| is preserved. For header fields with * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME` and * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE` are set, * header field name and value are not copied respectively. With * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`, application * is responsible to pass header field name in lowercase. The * application should maintain the references to them until * :type:`nghttp2_on_frame_send_callback` or * :type:`nghttp2_on_frame_not_send_callback` is called. * * The |stream_user_data| is a pointer to an arbitrary data which is * associated to the stream this frame will open. Therefore it is * only used if this frame opens streams, in other words, it changes * stream state from idle or reserved to open. * * This function is low-level in a sense that the application code can * specify flags directly. For usual HTTP request, * `nghttp2_submit_request2()` is useful. Likewise, for HTTP * response, prefer `nghttp2_submit_response2()`. * * This function returns newly assigned stream ID if it succeeds and * |stream_id| is -1. Otherwise, this function returns 0 if it * succeeds, or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE` * No stream ID is available because maximum stream ID was * reached. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0; or trying to depend on itself (stream ID * equals ``pri_spec->stream_id``). * :enum:`nghttp2_error.NGHTTP2_ERR_DATA_EXIST` * DATA or HEADERS has been already submitted and not fully * processed yet. This happens if stream denoted by |stream_id| * is in reserved state. * :enum:`nghttp2_error.NGHTTP2_ERR_PROTO` * The |stream_id| is -1, and |session| is server session. * * .. warning:: * * This function returns assigned stream ID if it succeeds and * |stream_id| is -1. But that stream is not opened yet. The * application must not submit frame to that stream ID before * :type:`nghttp2_before_frame_send_callback` is called for this * frame. * */ NGHTTP2_EXTERN int32_t nghttp2_submit_headers( nghttp2_session *session, uint8_t flags, int32_t stream_id, const nghttp2_priority_spec *pri_spec, const nghttp2_nv *nva, size_t nvlen, void *stream_user_data); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_submit_data2()` instead. * * Submits one or more DATA frames to the stream |stream_id|. The * data to be sent are provided by |data_prd|. If |flags| contains * :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM`, the last DATA frame * has END_STREAM flag set. * * This function does not take ownership of the |data_prd|. The * function copies the members of the |data_prd|. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_DATA_EXIST` * DATA or HEADERS has been already submitted and not fully * processed yet. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0. * :enum:`nghttp2_error.NGHTTP2_ERR_STREAM_CLOSED` * The stream was already closed; or the |stream_id| is invalid. * * .. note:: * * Currently, only one DATA or HEADERS is allowed for a stream at a * time. Submitting these frames more than once before first DATA * or HEADERS is finished results in * :enum:`nghttp2_error.NGHTTP2_ERR_DATA_EXIST` error code. The * earliest callback which tells that previous frame is done is * :type:`nghttp2_on_frame_send_callback`. In side that callback, * new data can be submitted using `nghttp2_submit_data()`. Of * course, all data except for last one must not have * :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM` flag set in |flags|. * This sounds a bit complicated, and we recommend to use * `nghttp2_submit_request()` and `nghttp2_submit_response()` to * avoid this cascading issue. The experience shows that for HTTP * use, these two functions are enough to implement both client and * server. */ NGHTTP2_EXTERN int nghttp2_submit_data(nghttp2_session *session, uint8_t flags, int32_t stream_id, const nghttp2_data_provider *data_prd); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Submits one or more DATA frames to the stream |stream_id|. The * data to be sent are provided by |data_prd|. If |flags| contains * :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM`, the last DATA frame * has END_STREAM flag set. * * This function does not take ownership of the |data_prd|. The * function copies the members of the |data_prd|. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_DATA_EXIST` * DATA or HEADERS has been already submitted and not fully * processed yet. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0. * :enum:`nghttp2_error.NGHTTP2_ERR_STREAM_CLOSED` * The stream was already closed; or the |stream_id| is invalid. * * .. note:: * * Currently, only one DATA or HEADERS is allowed for a stream at a * time. Submitting these frames more than once before first DATA * or HEADERS is finished results in * :enum:`nghttp2_error.NGHTTP2_ERR_DATA_EXIST` error code. The * earliest callback which tells that previous frame is done is * :type:`nghttp2_on_frame_send_callback`. In side that callback, * new data can be submitted using `nghttp2_submit_data2()`. Of * course, all data except for last one must not have * :enum:`nghttp2_flag.NGHTTP2_FLAG_END_STREAM` flag set in |flags|. * This sounds a bit complicated, and we recommend to use * `nghttp2_submit_request2()` and `nghttp2_submit_response2()` to * avoid this cascading issue. The experience shows that for HTTP * use, these two functions are enough to implement both client and * server. */ NGHTTP2_EXTERN int nghttp2_submit_data2(nghttp2_session *session, uint8_t flags, int32_t stream_id, const nghttp2_data_provider2 *data_prd); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return 0 without doing anything. * * Submits PRIORITY frame to change the priority of stream |stream_id| * to the priority specification |pri_spec|. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * The |pri_spec| is a deprecated priority specification of this * request. ``NULL`` is not allowed for this function. To specify the * priority, use `nghttp2_priority_spec_init()`. This function will * copy its data members. * * The ``pri_spec->weight`` must be in [:macro:`NGHTTP2_MIN_WEIGHT`, * :macro:`NGHTTP2_MAX_WEIGHT`], inclusive. If ``pri_spec->weight`` * is strictly less than :macro:`NGHTTP2_MIN_WEIGHT`, it becomes * :macro:`NGHTTP2_MIN_WEIGHT`. If it is strictly greater than * :macro:`NGHTTP2_MAX_WEIGHT`, it becomes * :macro:`NGHTTP2_MAX_WEIGHT`. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is received by a remote endpoint, this function does * nothing and returns 0. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0; or the |pri_spec| is NULL; or trying to * depend on itself. */ NGHTTP2_EXTERN int nghttp2_submit_priority(nghttp2_session *session, uint8_t flags, int32_t stream_id, const nghttp2_priority_spec *pri_spec); /** * @macro * * :macro:`NGHTTP2_EXTPRI_DEFAULT_URGENCY` is the default urgency * level for :rfc:`9218` extensible priorities. */ #define NGHTTP2_EXTPRI_DEFAULT_URGENCY 3 /** * @macro * * :macro:`NGHTTP2_EXTPRI_URGENCY_HIGH` is the highest urgency level * for :rfc:`9218` extensible priorities. */ #define NGHTTP2_EXTPRI_URGENCY_HIGH 0 /** * @macro * * :macro:`NGHTTP2_EXTPRI_URGENCY_LOW` is the lowest urgency level for * :rfc:`9218` extensible priorities. */ #define NGHTTP2_EXTPRI_URGENCY_LOW 7 /** * @macro * * :macro:`NGHTTP2_EXTPRI_URGENCY_LEVELS` is the number of urgency * levels for :rfc:`9218` extensible priorities. */ #define NGHTTP2_EXTPRI_URGENCY_LEVELS (NGHTTP2_EXTPRI_URGENCY_LOW + 1) /** * @struct * * :type:`nghttp2_extpri` is :rfc:`9218` extensible priorities * specification for a stream. */ typedef struct nghttp2_extpri { /** * :member:`urgency` is the urgency of a stream, it must be in * [:macro:`NGHTTP2_EXTPRI_URGENCY_HIGH`, * :macro:`NGHTTP2_EXTPRI_URGENCY_LOW`], inclusive, and 0 is the * highest urgency. */ uint32_t urgency; /** * :member:`inc` indicates that a content can be processed * incrementally or not. If inc is 0, it cannot be processed * incrementally. If inc is 1, it can be processed incrementally. * Other value is not permitted. */ int inc; } nghttp2_extpri; /** * @function * * Submits RST_STREAM frame to cancel/reject the stream |stream_id| * with the error code |error_code|. * * The pre-defined error code is one of :enum:`nghttp2_error_code`. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0. */ NGHTTP2_EXTERN int nghttp2_submit_rst_stream(nghttp2_session *session, uint8_t flags, int32_t stream_id, uint32_t error_code); /** * @function * * Stores local settings and submits SETTINGS frame. The |iv| is the * pointer to the array of :type:`nghttp2_settings_entry`. The |niv| * indicates the number of :type:`nghttp2_settings_entry`. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * This function does not take ownership of the |iv|. This function * copies all the elements in the |iv|. * * While updating individual stream's local window size, if the window * size becomes strictly larger than NGHTTP2_MAX_WINDOW_SIZE, * RST_STREAM is issued against such a stream. * * SETTINGS with :enum:`nghttp2_flag.NGHTTP2_FLAG_ACK` is * automatically submitted by the library and application could not * send it at its will. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |iv| contains invalid value (e.g., initial window size * strictly greater than (1 << 31) - 1. * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_submit_settings(nghttp2_session *session, uint8_t flags, const nghttp2_settings_entry *iv, size_t niv); /** * @function * * Submits PUSH_PROMISE frame. * * The |flags| is currently ignored. The library handles the * CONTINUATION frame internally and it correctly sets END_HEADERS to * the last sequence of the PUSH_PROMISE or CONTINUATION frame. * * The |stream_id| must be client initiated stream ID. * * The |nva| is an array of name/value pair :type:`nghttp2_nv` with * |nvlen| elements. The application is responsible to include * required pseudo-header fields (header field whose name starts with * ":") in |nva| and must place pseudo-headers before regular header * fields. * * This function creates copies of all name/value pairs in |nva|. It * also lower-cases all names in |nva|. The order of elements in * |nva| is preserved. For header fields with * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME` and * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE` are set, * header field name and value are not copied respectively. With * :enum:`nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME`, application * is responsible to pass header field name in lowercase. The * application should maintain the references to them until * :type:`nghttp2_on_frame_send_callback` or * :type:`nghttp2_on_frame_not_send_callback` is called. * * The |promised_stream_user_data| is a pointer to an arbitrary data * which is associated to the promised stream this frame will open and * make it in reserved state. It is available using * `nghttp2_session_get_stream_user_data()`. The application can * access it in :type:`nghttp2_before_frame_send_callback` and * :type:`nghttp2_on_frame_send_callback` of this frame. * * The client side is not allowed to use this function. * * To submit response headers and data, use * `nghttp2_submit_response2()`. * * This function returns assigned promised stream ID if it succeeds, * or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_PROTO` * This function was invoked when |session| is initialized as * client. * :enum:`nghttp2_error.NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE` * No stream ID is available because maximum stream ID was * reached. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is 0; The |stream_id| does not designate stream * that peer initiated. * :enum:`nghttp2_error.NGHTTP2_ERR_STREAM_CLOSED` * The stream was already closed; or the |stream_id| is invalid. * * .. warning:: * * This function returns assigned promised stream ID if it succeeds. * As of 1.16.0, stream object for pushed resource is created when * this function succeeds. In that case, the application can submit * push response for the promised frame. * * In 1.15.0 or prior versions, pushed stream is not opened yet when * this function succeeds. The application must not submit frame to * that stream ID before :type:`nghttp2_before_frame_send_callback` * is called for this frame. * */ NGHTTP2_EXTERN int32_t nghttp2_submit_push_promise( nghttp2_session *session, uint8_t flags, int32_t stream_id, const nghttp2_nv *nva, size_t nvlen, void *promised_stream_user_data); /** * @function * * Submits PING frame. You don't have to send PING back when you * received PING frame. The library automatically submits PING frame * in this case. * * The |flags| is bitwise OR of 0 or more of the following value. * * * :enum:`nghttp2_flag.NGHTTP2_FLAG_ACK` * * Unless `nghttp2_option_set_no_auto_ping_ack()` is used, the |flags| * should be :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * If the |opaque_data| is non ``NULL``, then it should point to the 8 * bytes array of memory to specify opaque data to send with PING * frame. If the |opaque_data| is ``NULL``, zero-cleared 8 bytes will * be sent as opaque data. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_submit_ping(nghttp2_session *session, uint8_t flags, const uint8_t *opaque_data); /** * @function * * Submits GOAWAY frame with the last stream ID |last_stream_id| and * the error code |error_code|. * * The pre-defined error code is one of :enum:`nghttp2_error_code`. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * The |last_stream_id| is peer's stream ID or 0. So if |session| is * initialized as client, |last_stream_id| must be even or 0. If * |session| is initialized as server, |last_stream_id| must be odd or * 0. * * The HTTP/2 specification says last_stream_id must not be increased * from the value previously sent. So the actual value sent as * last_stream_id is the minimum value between the given * |last_stream_id| and the last_stream_id previously sent to the * peer. * * If the |opaque_data| is not ``NULL`` and |opaque_data_len| is not * zero, those data will be sent as additional debug data. The * library makes a copy of the memory region pointed by |opaque_data| * with the length |opaque_data_len|, so the caller does not need to * keep this memory after the return of this function. If the * |opaque_data_len| is 0, the |opaque_data| could be ``NULL``. * * After successful transmission of GOAWAY, following things happen. * All incoming streams having strictly more than |last_stream_id| are * closed. All incoming HEADERS which starts new stream are simply * ignored. After all active streams are handled, both * `nghttp2_session_want_read()` and `nghttp2_session_want_write()` * return 0 and the application can close session. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |opaque_data_len| is too large; the |last_stream_id| is * invalid. */ NGHTTP2_EXTERN int nghttp2_submit_goaway(nghttp2_session *session, uint8_t flags, int32_t last_stream_id, uint32_t error_code, const uint8_t *opaque_data, size_t opaque_data_len); /** * @function * * Returns the last stream ID of a stream for which * :type:`nghttp2_on_frame_recv_callback` was invoked most recently. * The returned value can be used as last_stream_id parameter for * `nghttp2_submit_goaway()` and * `nghttp2_session_terminate_session2()`. * * This function always succeeds. */ NGHTTP2_EXTERN int32_t nghttp2_session_get_last_proc_stream_id(nghttp2_session *session); /** * @function * * Returns nonzero if new request can be sent from local endpoint. * * This function return 0 if request is not allowed for this session. * There are several reasons why request is not allowed. Some of the * reasons are: session is server; stream ID has been spent; GOAWAY * has been sent or received. * * The application can call `nghttp2_submit_request2()` without * consulting this function. In that case, * `nghttp2_submit_request2()` may return error. Or, request is * failed to sent, and :type:`nghttp2_on_stream_close_callback` is * called. */ NGHTTP2_EXTERN int nghttp2_session_check_request_allowed(nghttp2_session *session); /** * @function * * Returns nonzero if |session| is initialized as server side session. */ NGHTTP2_EXTERN int nghttp2_session_check_server_session(nghttp2_session *session); /** * @function * * Submits WINDOW_UPDATE frame. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * The |stream_id| is the stream ID to send this WINDOW_UPDATE. To * send connection level WINDOW_UPDATE, specify 0 to |stream_id|. * * If the |window_size_increment| is positive, the WINDOW_UPDATE with * that value as window_size_increment is queued. If the * |window_size_increment| is larger than the received bytes from the * remote endpoint, the local window size is increased by that * difference. If the sole purpose is to increase the local window * size, consider to use `nghttp2_session_set_local_window_size()`. * * If the |window_size_increment| is negative, the local window size * is decreased by -|window_size_increment|. If automatic * WINDOW_UPDATE is enabled * (`nghttp2_option_set_no_auto_window_update()`), and the library * decided that the WINDOW_UPDATE should be submitted, then * WINDOW_UPDATE is queued with the current received bytes count. If * the sole purpose is to decrease the local window size, consider to * use `nghttp2_session_set_local_window_size()`. * * If the |window_size_increment| is 0, the function does nothing and * returns 0. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_FLOW_CONTROL` * The local window size overflow or gets negative. * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_submit_window_update(nghttp2_session *session, uint8_t flags, int32_t stream_id, int32_t window_size_increment); /** * @function * * Set local window size (local endpoints's window size) to the given * |window_size| for the given stream denoted by |stream_id|. To * change connection level window size, specify 0 to |stream_id|. To * increase window size, this function may submit WINDOW_UPDATE frame * to transmission queue. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * This sounds similar to `nghttp2_submit_window_update()`, but there * are 2 differences. The first difference is that this function * takes the absolute value of window size to set, rather than the * delta. To change the window size, this may be easier to use since * the application just declares the intended window size, rather than * calculating delta. The second difference is that * `nghttp2_submit_window_update()` affects the received bytes count * which has not acked yet. By the specification of * `nghttp2_submit_window_update()`, to strictly increase the local * window size, we have to submit delta including all received bytes * count, which might not be desirable in some cases. On the other * hand, this function does not affect the received bytes count. It * just sets the local window size to the given value. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |stream_id| is negative. * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_session_set_local_window_size(nghttp2_session *session, uint8_t flags, int32_t stream_id, int32_t window_size); /** * @function * * Submits extension frame. * * Application can pass arbitrary frame flags and stream ID in |flags| * and |stream_id| respectively. The |payload| is opaque pointer, and * it can be accessible though ``frame->ext.payload`` in * :type:`nghttp2_pack_extension_callback2`. The library will not own * passed |payload| pointer. * * The application must set :type:`nghttp2_pack_extension_callback2` * using `nghttp2_session_callbacks_set_pack_extension_callback2()`. * * The application should retain the memory pointed by |payload| until * the transmission of extension frame is done (which is indicated by * :type:`nghttp2_on_frame_send_callback`), or transmission fails * (which is indicated by :type:`nghttp2_on_frame_not_send_callback`). * If application does not touch this memory region after packing it * into a wire format, application can free it inside * :type:`nghttp2_pack_extension_callback2`. * * The standard HTTP/2 frame cannot be sent with this function, so * |type| must be strictly grater than 0x9. Otherwise, this function * will fail with error code * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT`. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * If :type:`nghttp2_pack_extension_callback2` is not set. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * If |type| specifies standard HTTP/2 frame type. The frame * types in the rage [0x0, 0x9], both inclusive, are standard * HTTP/2 frame type, and cannot be sent using this function. * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory */ NGHTTP2_EXTERN int nghttp2_submit_extension(nghttp2_session *session, uint8_t type, uint8_t flags, int32_t stream_id, void *payload); /** * @struct * * The payload of ALTSVC frame. ALTSVC frame is a non-critical * extension to HTTP/2. If this frame is received, and * `nghttp2_option_set_user_recv_extension_type()` is not set, and * `nghttp2_option_set_builtin_recv_extension_type()` is set for * :enum:`nghttp2_frame_type.NGHTTP2_ALTSVC`, * ``nghttp2_extension.payload`` will point to this struct. * * It has the following members: */ typedef struct { /** * The pointer to origin which this alternative service is * associated with. This is not necessarily NULL-terminated. */ uint8_t *origin; /** * The length of the |origin|. */ size_t origin_len; /** * The pointer to Alt-Svc field value contained in ALTSVC frame. * This is not necessarily NULL-terminated. */ uint8_t *field_value; /** * The length of the |field_value|. */ size_t field_value_len; } nghttp2_ext_altsvc; /** * @function * * Submits ALTSVC frame. * * ALTSVC frame is a non-critical extension to HTTP/2, and defined in * `RFC 7383 <https://tools.ietf.org/html/rfc7838#section-4>`_. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * The |origin| points to the origin this alternative service is * associated with. The |origin_len| is the length of the origin. If * |stream_id| is 0, the origin must be specified. If |stream_id| is * not zero, the origin must be empty (in other words, |origin_len| * must be 0). * * The ALTSVC frame is only usable from server side. If this function * is invoked with client side session, this function returns * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE`. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * The function is called from client side session * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The sum of |origin_len| and |field_value_len| is larger than * 16382; or |origin_len| is 0 while |stream_id| is 0; or * |origin_len| is not 0 while |stream_id| is not 0. */ NGHTTP2_EXTERN int nghttp2_submit_altsvc(nghttp2_session *session, uint8_t flags, int32_t stream_id, const uint8_t *origin, size_t origin_len, const uint8_t *field_value, size_t field_value_len); /** * @struct * * The single entry of an origin. */ typedef struct { /** * The pointer to origin. No validation is made against this field * by the library. This is not necessarily NULL-terminated. */ uint8_t *origin; /** * The length of the |origin|. */ size_t origin_len; } nghttp2_origin_entry; /** * @struct * * The payload of ORIGIN frame. ORIGIN frame is a non-critical * extension to HTTP/2 and defined by `RFC 8336 * <https://tools.ietf.org/html/rfc8336>`_. * * If this frame is received, and * `nghttp2_option_set_user_recv_extension_type()` is not set, and * `nghttp2_option_set_builtin_recv_extension_type()` is set for * :enum:`nghttp2_frame_type.NGHTTP2_ORIGIN`, * ``nghttp2_extension.payload`` will point to this struct. * * It has the following members: */ typedef struct { /** * The number of origins contained in |ov|. */ size_t nov; /** * The pointer to the array of origins contained in ORIGIN frame. */ nghttp2_origin_entry *ov; } nghttp2_ext_origin; /** * @function * * Submits ORIGIN frame. * * ORIGIN frame is a non-critical extension to HTTP/2 and defined by * `RFC 8336 <https://tools.ietf.org/html/rfc8336>`_. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * The |ov| points to the array of origins. The |nov| specifies the * number of origins included in |ov|. This function creates copies * of all elements in |ov|. * * The ORIGIN frame is only usable by a server. If this function is * invoked with client side session, this function returns * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE`. * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * The function is called from client side session. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * There are too many origins, or an origin is too large to fit * into a default frame payload. */ NGHTTP2_EXTERN int nghttp2_submit_origin(nghttp2_session *session, uint8_t flags, const nghttp2_origin_entry *ov, size_t nov); /** * @struct * * The payload of PRIORITY_UPDATE frame. PRIORITY_UPDATE frame is a * non-critical extension to HTTP/2. If this frame is received, and * `nghttp2_option_set_user_recv_extension_type()` is not set, and * `nghttp2_option_set_builtin_recv_extension_type()` is set for * :enum:`nghttp2_frame_type.NGHTTP2_PRIORITY_UPDATE`, * ``nghttp2_extension.payload`` will point to this struct. * * It has the following members: */ typedef struct { /** * The stream ID of the stream whose priority is updated. */ int32_t stream_id; /** * The pointer to Priority field value. It is not necessarily * NULL-terminated. */ uint8_t *field_value; /** * The length of the :member:`field_value`. */ size_t field_value_len; } nghttp2_ext_priority_update; /** * @function * * Submits PRIORITY_UPDATE frame. * * PRIORITY_UPDATE frame is a non-critical extension to HTTP/2, and * defined in :rfc:`9218#section-7.1`. * * The |flags| is currently ignored and should be * :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`. * * The |stream_id| is the ID of stream which is prioritized. The * |field_value| points to the Priority field value. The * |field_value_len| is the length of the Priority field value. * * If this function is called by server, * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` is returned. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 0 is received by a remote endpoint (or it is omitted), * this function does nothing and returns 0. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * The function is called from server side session * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * The |field_value_len| is larger than 16380; or |stream_id| is * 0. */ NGHTTP2_EXTERN int nghttp2_submit_priority_update(nghttp2_session *session, uint8_t flags, int32_t stream_id, const uint8_t *field_value, size_t field_value_len); /** * @function * * Changes the priority of the existing stream denoted by |stream_id|. * The new priority is |extpri|. This function is meant to be used by * server for :rfc:`9218` extensible prioritization scheme. * * If |session| is initialized as client, this function returns * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE`. For client, use * `nghttp2_submit_priority_update()` instead. * * If :member:`extpri->urgency <nghttp2_extpri.urgency>` is out of * bound, it is set to :macro:`NGHTTP2_EXTPRI_URGENCY_LOW`. * * If |ignore_client_signal| is nonzero, server starts to ignore * client priority signals for this stream. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is not submitted via `nghttp2_submit_settings()`, * this function does nothing and returns 0. * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * The |session| is initialized as client. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * |stream_id| is zero; or a stream denoted by |stream_id| is not * found. */ NGHTTP2_EXTERN int nghttp2_session_change_extpri_stream_priority( nghttp2_session *session, int32_t stream_id, const nghttp2_extpri *extpri, int ignore_client_signal); /** * @function * * Stores the stream priority of the existing stream denoted by * |stream_id| in the object pointed by |extpri|. This function is * meant to be used by server for :rfc:`9218` extensible * prioritization scheme. * * If |session| is initialized as client, this function returns * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE`. * * If * :enum:`nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES` * of value of 1 is not submitted via `nghttp2_submit_settings()`, * this function does nothing and returns 0. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * The |session| is initialized as client. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * |stream_id| is zero; or a stream denoted by |stream_id| is not * found. */ NGHTTP2_EXTERN int nghttp2_session_get_extpri_stream_priority( nghttp2_session *session, nghttp2_extpri *extpri, int32_t stream_id); /** * @function * * Parses Priority header field value pointed by |value| of length * |len|, and stores the result in the object pointed by |extpri|. * Priority header field is defined in :rfc:`9218`. * * This function does not initialize the object pointed by |extpri| * before storing the result. It only assigns the values that the * parser correctly extracted to fields. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT` * Failed to parse the header field value. */ NGHTTP2_EXTERN int nghttp2_extpri_parse_priority(nghttp2_extpri *extpri, const uint8_t *value, size_t len); /** * @function * * Compares ``lhs->name`` of length ``lhs->namelen`` bytes and * ``rhs->name`` of length ``rhs->namelen`` bytes. Returns negative * integer if ``lhs->name`` is found to be less than ``rhs->name``; or * returns positive integer if ``lhs->name`` is found to be greater * than ``rhs->name``; or returns 0 otherwise. */ NGHTTP2_EXTERN int nghttp2_nv_compare_name(const nghttp2_nv *lhs, const nghttp2_nv *rhs); /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_select_alpn` instead. * * A helper function for dealing with ALPN in server side. The |in| * contains peer's protocol list in preferable order. The format of * |in| is length-prefixed and not null-terminated. For example, * ``h2`` and ``http/1.1`` stored in |in| like this:: * * in[0] = 2 * in[1..2] = "h2" * in[3] = 8 * in[4..11] = "http/1.1" * inlen = 12 * * The selection algorithm is as follows: * * 1. If peer's list contains HTTP/2 protocol the library supports, * it is selected and returns 1. The following step is not taken. * * 2. If peer's list contains ``http/1.1``, this function selects * ``http/1.1`` and returns 0. The following step is not taken. * * 3. This function selects nothing and returns -1 (So called * non-overlap case). In this case, |out| and |outlen| are left * untouched. * * Selecting ``h2`` means that ``h2`` is written into |*out| and its * length (which is 2) is assigned to |*outlen|. * * For ALPN, refer to https://tools.ietf.org/html/rfc7301 * * To use this method you should do something like:: * * static int alpn_select_proto_cb(SSL* ssl, * const unsigned char **out, * unsigned char *outlen, * const unsigned char *in, * unsigned int inlen, * void *arg) * { * int rv; * rv = nghttp2_select_next_protocol((unsigned char**)out, outlen, * in, inlen); * if (rv == -1) { * return SSL_TLSEXT_ERR_NOACK; * } * if (rv == 1) { * ((MyType*)arg)->http2_selected = 1; * } * return SSL_TLSEXT_ERR_OK; * } * ... * SSL_CTX_set_alpn_select_cb(ssl_ctx, alpn_select_proto_cb, my_obj); * */ NGHTTP2_EXTERN int nghttp2_select_next_protocol(unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen); /** * @function * * A helper function for dealing with ALPN in server side. The |in| * contains peer's protocol list in preferable order. The format of * |in| is length-prefixed and not null-terminated. For example, * ``h2`` and ``http/1.1`` stored in |in| like this:: * * in[0] = 2 * in[1..2] = "h2" * in[3] = 8 * in[4..11] = "http/1.1" * inlen = 12 * * The selection algorithm is as follows: * * 1. If peer's list contains HTTP/2 protocol the library supports, * it is selected and returns 1. The following step is not taken. * * 2. If peer's list contains ``http/1.1``, this function selects * ``http/1.1`` and returns 0. The following step is not taken. * * 3. This function selects nothing and returns -1 (So called * non-overlap case). In this case, |out| and |outlen| are left * untouched. * * Selecting ``h2`` means that ``h2`` is written into |*out| and its * length (which is 2) is assigned to |*outlen|. * * For ALPN, refer to https://tools.ietf.org/html/rfc7301 * * To use this method you should do something like:: * * static int alpn_select_proto_cb(SSL* ssl, * const unsigned char **out, * unsigned char *outlen, * const unsigned char *in, * unsigned int inlen, * void *arg) * { * int rv; * rv = nghttp2_select_alpn(out, outlen, in, inlen); * if (rv == -1) { * return SSL_TLSEXT_ERR_NOACK; * } * if (rv == 1) { * ((MyType*)arg)->http2_selected = 1; * } * return SSL_TLSEXT_ERR_OK; * } * ... * SSL_CTX_set_alpn_select_cb(ssl_ctx, alpn_select_proto_cb, my_obj); * */ NGHTTP2_EXTERN int nghttp2_select_alpn(const unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen); /** * @function * * Returns a pointer to a nghttp2_info struct with version information * about the run-time library in use. The |least_version| argument * can be set to a 24 bit numerical value for the least accepted * version number and if the condition is not met, this function will * return a ``NULL``. Pass in 0 to skip the version checking. */ NGHTTP2_EXTERN nghttp2_info *nghttp2_version(int least_version); /** * @function * * Returns nonzero if the :type:`nghttp2_error` library error code * |lib_error| is fatal. */ NGHTTP2_EXTERN int nghttp2_is_fatal(int lib_error_code); /** * @function * * Returns nonzero if HTTP header field name |name| of length |len| is * valid according to http://tools.ietf.org/html/rfc7230#section-3.2 * * Because this is a header field name in HTTP2, the upper cased alphabet * is treated as error. */ NGHTTP2_EXTERN int nghttp2_check_header_name(const uint8_t *name, size_t len); /** * @function * * Returns nonzero if HTTP header field value |value| of length |len| * is valid according to * http://tools.ietf.org/html/rfc7230#section-3.2 * * This function is considered obsolete, and application should * consider to use `nghttp2_check_header_value_rfc9113()` instead. */ NGHTTP2_EXTERN int nghttp2_check_header_value(const uint8_t *value, size_t len); /** * @function * * Returns nonzero if HTTP header field value |value| of length |len| * is valid according to * http://tools.ietf.org/html/rfc7230#section-3.2, plus * https://datatracker.ietf.org/doc/html/rfc9113#section-8.2.1 */ NGHTTP2_EXTERN int nghttp2_check_header_value_rfc9113(const uint8_t *value, size_t len); /** * @function * * Returns nonzero if the |value| which is supposed to be the value of * the :method header field is valid according to * https://datatracker.ietf.org/doc/html/rfc7231#section-4 and * https://datatracker.ietf.org/doc/html/rfc7230#section-3.2.6 */ NGHTTP2_EXTERN int nghttp2_check_method(const uint8_t *value, size_t len); /** * @function * * Returns nonzero if the |value| which is supposed to be the value of * the :path header field is valid according to * https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2.3 * * |value| is valid if it merely consists of the allowed characters. * In particular, it does not check whether |value| follows the syntax * of path. The allowed characters are all characters valid by * `nghttp2_check_header_value` minus SPC and HT. */ NGHTTP2_EXTERN int nghttp2_check_path(const uint8_t *value, size_t len); /** * @function * * Returns nonzero if the |value| which is supposed to be the value of the * :authority or host header field is valid according to * https://tools.ietf.org/html/rfc3986#section-3.2 * * |value| is valid if it merely consists of the allowed characters. * In particular, it does not check whether |value| follows the syntax * of authority. */ NGHTTP2_EXTERN int nghttp2_check_authority(const uint8_t *value, size_t len); /* HPACK API */ struct nghttp2_hd_deflater; /** * @struct * * HPACK deflater object. */ typedef struct nghttp2_hd_deflater nghttp2_hd_deflater; /** * @function * * Initializes |*deflater_ptr| for deflating name/values pairs. * * The |max_deflate_dynamic_table_size| is the upper bound of header * table size the deflater will use. * * If this function fails, |*deflater_ptr| is left untouched. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_hd_deflate_new(nghttp2_hd_deflater **deflater_ptr, size_t max_deflate_dynamic_table_size); /** * @function * * Like `nghttp2_hd_deflate_new()`, but with additional custom memory * allocator specified in the |mem|. * * The |mem| can be ``NULL`` and the call is equivalent to * `nghttp2_hd_deflate_new()`. * * This function does not take ownership |mem|. The application is * responsible for freeing |mem|. * * The library code does not refer to |mem| pointer after this * function returns, so the application can safely free it. */ NGHTTP2_EXTERN int nghttp2_hd_deflate_new2(nghttp2_hd_deflater **deflater_ptr, size_t max_deflate_dynamic_table_size, nghttp2_mem *mem); /** * @function * * Deallocates any resources allocated for |deflater|. */ NGHTTP2_EXTERN void nghttp2_hd_deflate_del(nghttp2_hd_deflater *deflater); /** * @function * * Changes header table size of the |deflater| to * |settings_max_dynamic_table_size| bytes. This may trigger eviction * in the dynamic table. * * The |settings_max_dynamic_table_size| should be the value received * in SETTINGS_HEADER_TABLE_SIZE. * * The deflater never uses more memory than * ``max_deflate_dynamic_table_size`` bytes specified in * `nghttp2_hd_deflate_new()`. Therefore, if * |settings_max_dynamic_table_size| > * ``max_deflate_dynamic_table_size``, resulting maximum table size * becomes ``max_deflate_dynamic_table_size``. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_hd_deflate_change_table_size(nghttp2_hd_deflater *deflater, size_t settings_max_dynamic_table_size); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_hd_deflate_hd2()` instead. * * Deflates the |nva|, which has the |nvlen| name/value pairs, into * the |buf| of length |buflen|. * * If |buf| is not large enough to store the deflated header block, * this function fails with * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`. The caller * should use `nghttp2_hd_deflate_bound()` to know the upper bound of * buffer size required to deflate given header name/value pairs. * * Once this function fails, subsequent call of this function always * returns :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`. * * After this function returns, it is safe to delete the |nva|. * * This function returns the number of bytes written to |buf| if it * succeeds, or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP` * Deflation process has failed. * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE` * The provided |buflen| size is too small to hold the output. */ NGHTTP2_EXTERN ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_deflater *deflater, uint8_t *buf, size_t buflen, const nghttp2_nv *nva, size_t nvlen); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Deflates the |nva|, which has the |nvlen| name/value pairs, into * the |buf| of length |buflen|. * * If |buf| is not large enough to store the deflated header block, * this function fails with * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`. The caller * should use `nghttp2_hd_deflate_bound()` to know the upper bound of * buffer size required to deflate given header name/value pairs. * * Once this function fails, subsequent call of this function always * returns :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`. * * After this function returns, it is safe to delete the |nva|. * * This function returns the number of bytes written to |buf| if it * succeeds, or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP` * Deflation process has failed. * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE` * The provided |buflen| size is too small to hold the output. */ NGHTTP2_EXTERN nghttp2_ssize nghttp2_hd_deflate_hd2(nghttp2_hd_deflater *deflater, uint8_t *buf, size_t buflen, const nghttp2_nv *nva, size_t nvlen); #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_hd_deflate_hd_vec2()` instead. * * Deflates the |nva|, which has the |nvlen| name/value pairs, into * the |veclen| size of buf vector |vec|. The each size of buffer * must be set in len field of :type:`nghttp2_vec`. If and only if * one chunk is filled up completely, next chunk will be used. If * |vec| is not large enough to store the deflated header block, this * function fails with * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`. The caller * should use `nghttp2_hd_deflate_bound()` to know the upper bound of * buffer size required to deflate given header name/value pairs. * * Once this function fails, subsequent call of this function always * returns :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`. * * After this function returns, it is safe to delete the |nva|. * * This function returns the number of bytes written to |vec| if it * succeeds, or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP` * Deflation process has failed. * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE` * The provided |buflen| size is too small to hold the output. */ NGHTTP2_EXTERN ssize_t nghttp2_hd_deflate_hd_vec(nghttp2_hd_deflater *deflater, const nghttp2_vec *vec, size_t veclen, const nghttp2_nv *nva, size_t nvlen); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Deflates the |nva|, which has the |nvlen| name/value pairs, into * the |veclen| size of buf vector |vec|. The each size of buffer * must be set in len field of :type:`nghttp2_vec`. If and only if * one chunk is filled up completely, next chunk will be used. If * |vec| is not large enough to store the deflated header block, this * function fails with * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`. The caller * should use `nghttp2_hd_deflate_bound()` to know the upper bound of * buffer size required to deflate given header name/value pairs. * * Once this function fails, subsequent call of this function always * returns :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP`. * * After this function returns, it is safe to delete the |nva|. * * This function returns the number of bytes written to |vec| if it * succeeds, or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP` * Deflation process has failed. * :enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE` * The provided |buflen| size is too small to hold the output. */ NGHTTP2_EXTERN nghttp2_ssize nghttp2_hd_deflate_hd_vec2( nghttp2_hd_deflater *deflater, const nghttp2_vec *vec, size_t veclen, const nghttp2_nv *nva, size_t nvlen); /** * @function * * Returns an upper bound on the compressed size after deflation of * |nva| of length |nvlen|. */ NGHTTP2_EXTERN size_t nghttp2_hd_deflate_bound(nghttp2_hd_deflater *deflater, const nghttp2_nv *nva, size_t nvlen); /** * @function * * Returns the number of entries that header table of |deflater| * contains. This is the sum of the number of static table and * dynamic table, so the return value is at least 61. */ NGHTTP2_EXTERN size_t nghttp2_hd_deflate_get_num_table_entries(nghttp2_hd_deflater *deflater); /** * @function * * Returns the table entry denoted by |idx| from header table of * |deflater|. The |idx| is 1-based, and idx=1 returns first entry of * static table. idx=62 returns first entry of dynamic table if it * exists. Specifying idx=0 is error, and this function returns NULL. * If |idx| is strictly greater than the number of entries the tables * contain, this function returns NULL. */ NGHTTP2_EXTERN const nghttp2_nv * nghttp2_hd_deflate_get_table_entry(nghttp2_hd_deflater *deflater, size_t idx); /** * @function * * Returns the used dynamic table size, including the overhead 32 * bytes per entry described in RFC 7541. */ NGHTTP2_EXTERN size_t nghttp2_hd_deflate_get_dynamic_table_size(nghttp2_hd_deflater *deflater); /** * @function * * Returns the maximum dynamic table size. */ NGHTTP2_EXTERN size_t nghttp2_hd_deflate_get_max_dynamic_table_size(nghttp2_hd_deflater *deflater); struct nghttp2_hd_inflater; /** * @struct * * HPACK inflater object. */ typedef struct nghttp2_hd_inflater nghttp2_hd_inflater; /** * @function * * Initializes |*inflater_ptr| for inflating name/values pairs. * * If this function fails, |*inflater_ptr| is left untouched. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. */ NGHTTP2_EXTERN int nghttp2_hd_inflate_new(nghttp2_hd_inflater **inflater_ptr); /** * @function * * Like `nghttp2_hd_inflate_new()`, but with additional custom memory * allocator specified in the |mem|. * * The |mem| can be ``NULL`` and the call is equivalent to * `nghttp2_hd_inflate_new()`. * * This function does not take ownership |mem|. The application is * responsible for freeing |mem|. * * The library code does not refer to |mem| pointer after this * function returns, so the application can safely free it. */ NGHTTP2_EXTERN int nghttp2_hd_inflate_new2(nghttp2_hd_inflater **inflater_ptr, nghttp2_mem *mem); /** * @function * * Deallocates any resources allocated for |inflater|. */ NGHTTP2_EXTERN void nghttp2_hd_inflate_del(nghttp2_hd_inflater *inflater); /** * @function * * Changes header table size in the |inflater|. This may trigger * eviction in the dynamic table. * * The |settings_max_dynamic_table_size| should be the value * transmitted in SETTINGS_HEADER_TABLE_SIZE. * * This function must not be called while header block is being * inflated. In other words, this function must be called after * initialization of |inflater|, but before calling * `nghttp2_hd_inflate_hd3()`, or after * `nghttp2_hd_inflate_end_headers()`. Otherwise, * `NGHTTP2_ERR_INVALID_STATE` was returned. * * This function returns 0 if it succeeds, or one of the following * negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_INVALID_STATE` * The function is called while header block is being inflated. * Probably, application missed to call * `nghttp2_hd_inflate_end_headers()`. */ NGHTTP2_EXTERN int nghttp2_hd_inflate_change_table_size(nghttp2_hd_inflater *inflater, size_t settings_max_dynamic_table_size); /** * @enum * * The flags for header inflation. */ typedef enum { /** * No flag set. */ NGHTTP2_HD_INFLATE_NONE = 0, /** * Indicates all headers were inflated. */ NGHTTP2_HD_INFLATE_FINAL = 0x01, /** * Indicates a header was emitted. */ NGHTTP2_HD_INFLATE_EMIT = 0x02 } nghttp2_hd_inflate_flag; #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_hd_inflate_hd2()` instead. * * Inflates name/value block stored in |in| with length |inlen|. This * function performs decompression. For each successful emission of * header name/value pair, * :enum:`nghttp2_hd_inflate_flag.NGHTTP2_HD_INFLATE_EMIT` is set in * |*inflate_flags| and name/value pair is assigned to the |nv_out| * and the function returns. The caller must not free the members of * |nv_out|. * * The |nv_out| may include pointers to the memory region in the |in|. * The caller must retain the |in| while the |nv_out| is used. * * The application should call this function repeatedly until the * ``(*inflate_flags) & NGHTTP2_HD_INFLATE_FINAL`` is nonzero and * return value is non-negative. This means the all input values are * processed successfully. Then the application must call * `nghttp2_hd_inflate_end_headers()` to prepare for the next header * block input. * * The caller can feed complete compressed header block. It also can * feed it in several chunks. The caller must set |in_final| to * nonzero if the given input is the last block of the compressed * header. * * This function returns the number of bytes processed if it succeeds, * or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP` * Inflation process has failed. * :enum:`nghttp2_error.NGHTTP2_ERR_BUFFER_ERROR` * The header field name or value is too large. * * Example follows:: * * int inflate_header_block(nghttp2_hd_inflater *hd_inflater, * uint8_t *in, size_t inlen, int final) * { * ssize_t rv; * * for(;;) { * nghttp2_nv nv; * int inflate_flags = 0; * * rv = nghttp2_hd_inflate_hd(hd_inflater, &nv, &inflate_flags, * in, inlen, final); * * if(rv < 0) { * fprintf(stderr, "inflate failed with error code %zd", rv); * return -1; * } * * in += rv; * inlen -= rv; * * if(inflate_flags & NGHTTP2_HD_INFLATE_EMIT) { * fwrite(nv.name, nv.namelen, 1, stderr); * fprintf(stderr, ": "); * fwrite(nv.value, nv.valuelen, 1, stderr); * fprintf(stderr, "\n"); * } * if(inflate_flags & NGHTTP2_HD_INFLATE_FINAL) { * nghttp2_hd_inflate_end_headers(hd_inflater); * break; * } * if((inflate_flags & NGHTTP2_HD_INFLATE_EMIT) == 0 && * inlen == 0) { * break; * } * } * * return 0; * } * */ NGHTTP2_EXTERN ssize_t nghttp2_hd_inflate_hd(nghttp2_hd_inflater *inflater, nghttp2_nv *nv_out, int *inflate_flags, uint8_t *in, size_t inlen, int in_final); #endif /* NGHTTP2_NO_SSIZE_T */ #ifndef NGHTTP2_NO_SSIZE_T /** * @function * * .. warning:: * * Deprecated. Use `nghttp2_hd_inflate_hd3()` instead. * * Inflates name/value block stored in |in| with length |inlen|. This * function performs decompression. For each successful emission of * header name/value pair, * :enum:`nghttp2_hd_inflate_flag.NGHTTP2_HD_INFLATE_EMIT` is set in * |*inflate_flags| and name/value pair is assigned to the |nv_out| * and the function returns. The caller must not free the members of * |nv_out|. * * The |nv_out| may include pointers to the memory region in the |in|. * The caller must retain the |in| while the |nv_out| is used. * * The application should call this function repeatedly until the * ``(*inflate_flags) & NGHTTP2_HD_INFLATE_FINAL`` is nonzero and * return value is non-negative. If that happens, all given input * data (|inlen| bytes) are processed successfully. Then the * application must call `nghttp2_hd_inflate_end_headers()` to prepare * for the next header block input. * * In other words, if |in_final| is nonzero, and this function returns * |inlen|, you can assert that * :enum:`nghttp2_hd_inflate_final.NGHTTP2_HD_INFLATE_FINAL` is set in * |*inflate_flags|. * * The caller can feed complete compressed header block. It also can * feed it in several chunks. The caller must set |in_final| to * nonzero if the given input is the last block of the compressed * header. * * This function returns the number of bytes processed if it succeeds, * or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP` * Inflation process has failed. * :enum:`nghttp2_error.NGHTTP2_ERR_BUFFER_ERROR` * The header field name or value is too large. * * Example follows:: * * int inflate_header_block(nghttp2_hd_inflater *hd_inflater, * uint8_t *in, size_t inlen, int final) * { * ssize_t rv; * * for(;;) { * nghttp2_nv nv; * int inflate_flags = 0; * * rv = nghttp2_hd_inflate_hd2(hd_inflater, &nv, &inflate_flags, * in, inlen, final); * * if(rv < 0) { * fprintf(stderr, "inflate failed with error code %zd", rv); * return -1; * } * * in += rv; * inlen -= rv; * * if(inflate_flags & NGHTTP2_HD_INFLATE_EMIT) { * fwrite(nv.name, nv.namelen, 1, stderr); * fprintf(stderr, ": "); * fwrite(nv.value, nv.valuelen, 1, stderr); * fprintf(stderr, "\n"); * } * if(inflate_flags & NGHTTP2_HD_INFLATE_FINAL) { * nghttp2_hd_inflate_end_headers(hd_inflater); * break; * } * if((inflate_flags & NGHTTP2_HD_INFLATE_EMIT) == 0 && * inlen == 0) { * break; * } * } * * return 0; * } * */ NGHTTP2_EXTERN ssize_t nghttp2_hd_inflate_hd2(nghttp2_hd_inflater *inflater, nghttp2_nv *nv_out, int *inflate_flags, const uint8_t *in, size_t inlen, int in_final); #endif /* NGHTTP2_NO_SSIZE_T */ /** * @function * * Inflates name/value block stored in |in| with length |inlen|. This * function performs decompression. For each successful emission of * header name/value pair, * :enum:`nghttp2_hd_inflate_flag.NGHTTP2_HD_INFLATE_EMIT` is set in * |*inflate_flags| and name/value pair is assigned to the |nv_out| * and the function returns. The caller must not free the members of * |nv_out|. * * The |nv_out| may include pointers to the memory region in the |in|. * The caller must retain the |in| while the |nv_out| is used. * * The application should call this function repeatedly until the * ``(*inflate_flags) & NGHTTP2_HD_INFLATE_FINAL`` is nonzero and * return value is non-negative. If that happens, all given input * data (|inlen| bytes) are processed successfully. Then the * application must call `nghttp2_hd_inflate_end_headers()` to prepare * for the next header block input. * * In other words, if |in_final| is nonzero, and this function returns * |inlen|, you can assert that * :enum:`nghttp2_hd_inflate_final.NGHTTP2_HD_INFLATE_FINAL` is set in * |*inflate_flags|. * * The caller can feed complete compressed header block. It also can * feed it in several chunks. The caller must set |in_final| to * nonzero if the given input is the last block of the compressed * header. * * This function returns the number of bytes processed if it succeeds, * or one of the following negative error codes: * * :enum:`nghttp2_error.NGHTTP2_ERR_NOMEM` * Out of memory. * :enum:`nghttp2_error.NGHTTP2_ERR_HEADER_COMP` * Inflation process has failed. * :enum:`nghttp2_error.NGHTTP2_ERR_BUFFER_ERROR` * The header field name or value is too large. * * Example follows:: * * int inflate_header_block(nghttp2_hd_inflater *hd_inflater, * uint8_t *in, size_t inlen, int final) * { * nghttp2_ssize rv; * * for(;;) { * nghttp2_nv nv; * int inflate_flags = 0; * * rv = nghttp2_hd_inflate_hd3(hd_inflater, &nv, &inflate_flags, * in, inlen, final); * * if(rv < 0) { * fprintf(stderr, "inflate failed with error code %td", rv); * return -1; * } * * in += rv; * inlen -= rv; * * if(inflate_flags & NGHTTP2_HD_INFLATE_EMIT) { * fwrite(nv.name, nv.namelen, 1, stderr); * fprintf(stderr, ": "); * fwrite(nv.value, nv.valuelen, 1, stderr); * fprintf(stderr, "\n"); * } * if(inflate_flags & NGHTTP2_HD_INFLATE_FINAL) { * nghttp2_hd_inflate_end_headers(hd_inflater); * break; * } * if((inflate_flags & NGHTTP2_HD_INFLATE_EMIT) == 0 && * inlen == 0) { * break; * } * } * * return 0; * } * */ NGHTTP2_EXTERN nghttp2_ssize nghttp2_hd_inflate_hd3( nghttp2_hd_inflater *inflater, nghttp2_nv *nv_out, int *inflate_flags, const uint8_t *in, size_t inlen, int in_final); /** * @function * * Signals the end of decompression for one header block. * * This function returns 0 if it succeeds. Currently this function * always succeeds. */ NGHTTP2_EXTERN int nghttp2_hd_inflate_end_headers(nghttp2_hd_inflater *inflater); /** * @function * * Returns the number of entries that header table of |inflater| * contains. This is the sum of the number of static table and * dynamic table, so the return value is at least 61. */ NGHTTP2_EXTERN size_t nghttp2_hd_inflate_get_num_table_entries(nghttp2_hd_inflater *inflater); /** * @function * * Returns the table entry denoted by |idx| from header table of * |inflater|. The |idx| is 1-based, and idx=1 returns first entry of * static table. idx=62 returns first entry of dynamic table if it * exists. Specifying idx=0 is error, and this function returns NULL. * If |idx| is strictly greater than the number of entries the tables * contain, this function returns NULL. */ NGHTTP2_EXTERN const nghttp2_nv * nghttp2_hd_inflate_get_table_entry(nghttp2_hd_inflater *inflater, size_t idx); /** * @function * * Returns the used dynamic table size, including the overhead 32 * bytes per entry described in RFC 7541. */ NGHTTP2_EXTERN size_t nghttp2_hd_inflate_get_dynamic_table_size(nghttp2_hd_inflater *inflater); /** * @function * * Returns the maximum dynamic table size. */ NGHTTP2_EXTERN size_t nghttp2_hd_inflate_get_max_dynamic_table_size(nghttp2_hd_inflater *inflater); struct nghttp2_stream; /** * @struct * * The structure to represent HTTP/2 stream. The details of this * structure are intentionally hidden from the public API. */ typedef struct nghttp2_stream nghttp2_stream; /** * @function * * Returns pointer to :type:`nghttp2_stream` object denoted by * |stream_id|. If stream was not found, returns NULL. * * Returns imaginary root stream (see * `nghttp2_session_get_root_stream()`) if 0 is given in |stream_id|. * * Unless |stream_id| == 0, the returned pointer is valid until next * call of `nghttp2_session_send()`, `nghttp2_session_mem_send2()`, * `nghttp2_session_recv()`, and `nghttp2_session_mem_recv2()`. */ NGHTTP2_EXTERN nghttp2_stream * nghttp2_session_find_stream(nghttp2_session *session, int32_t stream_id); /** * @enum * * State of stream as described in RFC 7540. */ typedef enum { /** * idle state. */ NGHTTP2_STREAM_STATE_IDLE = 1, /** * open state. */ NGHTTP2_STREAM_STATE_OPEN, /** * reserved (local) state. */ NGHTTP2_STREAM_STATE_RESERVED_LOCAL, /** * reserved (remote) state. */ NGHTTP2_STREAM_STATE_RESERVED_REMOTE, /** * half closed (local) state. */ NGHTTP2_STREAM_STATE_HALF_CLOSED_LOCAL, /** * half closed (remote) state. */ NGHTTP2_STREAM_STATE_HALF_CLOSED_REMOTE, /** * closed state. */ NGHTTP2_STREAM_STATE_CLOSED } nghttp2_stream_proto_state; /** * @function * * Returns state of |stream|. The root stream retrieved by * `nghttp2_session_get_root_stream()` will have stream state * :enum:`nghttp2_stream_proto_state.NGHTTP2_STREAM_STATE_IDLE`. */ NGHTTP2_EXTERN nghttp2_stream_proto_state nghttp2_stream_get_state(nghttp2_stream *stream); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. * * Returns root of dependency tree, which is imaginary stream with * stream ID 0. The returned pointer is valid until |session| is * freed by `nghttp2_session_del()`. */ NGHTTP2_EXTERN nghttp2_stream * nghttp2_session_get_root_stream(nghttp2_session *session); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return NULL. * * Returns the parent stream of |stream| in dependency tree. Returns * NULL if there is no such stream. */ NGHTTP2_EXTERN nghttp2_stream * nghttp2_stream_get_parent(nghttp2_stream *stream); NGHTTP2_EXTERN int32_t nghttp2_stream_get_stream_id(nghttp2_stream *stream); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return NULL. * * Returns the next sibling stream of |stream| in dependency tree. * Returns NULL if there is no such stream. */ NGHTTP2_EXTERN nghttp2_stream * nghttp2_stream_get_next_sibling(nghttp2_stream *stream); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return NULL. * * Returns the previous sibling stream of |stream| in dependency tree. * Returns NULL if there is no such stream. */ NGHTTP2_EXTERN nghttp2_stream * nghttp2_stream_get_previous_sibling(nghttp2_stream *stream); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return NULL. * * Returns the first child stream of |stream| in dependency tree. * Returns NULL if there is no such stream. */ NGHTTP2_EXTERN nghttp2_stream * nghttp2_stream_get_first_child(nghttp2_stream *stream); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return * :macro:`NGHTTP2_DEFAULT_WEIGHT`. * * Returns dependency weight to the parent stream of |stream|. */ NGHTTP2_EXTERN int32_t nghttp2_stream_get_weight(nghttp2_stream *stream); /** * @function * * .. warning:: * * Deprecated. :rfc:`7540` priorities are deprecated by * :rfc:`9113`. Consider migrating to :rfc:`9218` extensible * prioritization scheme. In the future release after the end of * 2024, this function will always return 0. * * Returns the sum of the weight for |stream|'s children. */ NGHTTP2_EXTERN int32_t nghttp2_stream_get_sum_dependency_weight(nghttp2_stream *stream); /** * @functypedef * * Callback function invoked when the library outputs debug logging. * The function is called with arguments suitable for ``vfprintf(3)`` * * The debug output is only enabled if the library is built with * ``DEBUGBUILD`` macro defined. */ typedef void (*nghttp2_debug_vprintf_callback)(const char *format, va_list args); /** * @function * * Sets a debug output callback called by the library when built with * ``DEBUGBUILD`` macro defined. If this option is not used, debug * log is written into standard error output. * * For builds without ``DEBUGBUILD`` macro defined, this function is * noop. * * Note that building with ``DEBUGBUILD`` may cause significant * performance penalty to libnghttp2 because of extra processing. It * should be used for debugging purpose only. * * .. Warning:: * * Building with ``DEBUGBUILD`` may cause significant performance * penalty to libnghttp2 because of extra processing. It should be * used for debugging purpose only. We write this two times because * this is important. */ NGHTTP2_EXTERN void nghttp2_set_debug_vprintf_callback( nghttp2_debug_vprintf_callback debug_vprintf_callback); #ifdef __cplusplus } #endif #endif /* NGHTTP2_H */
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