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📄 nghttp2.h /* * 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 <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) / /* * @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 * * The default weight of stream dependency. / #define NGHTTP2_DEFAULT_WEIGHT 16 /* * @macro * * The maximum weight of stream dependency. / #define NGHTTP2_MAX_WEIGHT 256 /* * @macro * * 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_callback`, * :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_callback` to indicate that data * transfer is postponed. See * :func:`nghttp2_data_source_read_callback` 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 } 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 } 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_callback`. / 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_callback`. / 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_request()` or * `nghttp2_submit_response()`. / 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; /* * @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_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); /* * @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_callback read_callback; } nghttp2_data_provider; /* * @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 * * 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; /* * 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 * * 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; /* * @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_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); /* * @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_send()` 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); /* * @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_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); /* * @functypedef * * Callback function invoked by `nghttp2_session_recv()` and * `nghttp2_session_mem_recv()` 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`. * * For HEADERS, PUSH_PROMISE and DATA frames, this callback may be * called after stream is closed (see * :type:`nghttp2_on_stream_close_callback`). The application should * check that stream is still alive using its own stream management or * :func:`nghttp2_session_get_stream_user_data()`. * * 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_recv()` 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_recv()` 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_recv()` 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_recv()`, it can return * :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` to make * `nghttp2_session_mem_recv()` return without processing further * input bytes. The memory by pointed by the \|data\| is retained until * `nghttp2_session_mem_recv()` 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_recv()` 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_send()` 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_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_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_send()` 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_request()` 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_recv()`, * `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_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_recv()` 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_recv()`, it can return * :enum:`nghttp2_error.NGHTTP2_ERR_PAUSE` to make * `nghttp2_session_mem_recv()` return without processing further * input bytes. The memory pointed by \|frame\|, \|name\| and \|value\| * parameters are retained until `nghttp2_session_mem_recv()` 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_recv()` 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); /* * @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_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); /* * @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_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); /** * @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_recv()` 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_recv()` 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 ot 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_recv()` 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); /* * @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_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); /** * @functypedef * * 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. * * This function is deprecated. The new application should use * :type:`nghttp2_error_callback2`. * * 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); /** * @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_send()` to serialize data to * transmit. / NGHTTP2_EXTERN void nghttp2_session_callbacks_set_send_callback( nghttp2_session_callbacks cbs, nghttp2_send_callback send_callback); /** * @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_recv()` to process * received data. / NGHTTP2_EXTERN void nghttp2_session_callbacks_set_recv_callback( nghttp2_session_callbacks cbs, nghttp2_recv_callback recv_callback); /** * @function * * Sets callback function invoked by `nghttp2_session_recv()` and * `nghttp2_session_mem_recv()` 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_recv()` 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); /** * @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_callback( nghttp2_session_callbacks cbs, nghttp2_select_padding_callback select_padding_callback); /** * @function * * 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); /** * @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_callback` 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); /** * @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_callback( nghttp2_session_callbacks cbs, nghttp2_pack_extension_callback 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 * * Sets callback function invoked when library tells error message to * the application. * * This function is deprecated. The new application should use * `nghttp2_session_callbacks_set_error_callback2()`. * * 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_recv()` 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. / 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 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_callback` 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_callback` 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_callback` 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_callback` 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); /** * @function * * 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); / * @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); /** * @function * * Processes data \|in\| as an input from the remote endpoint. The * \|inlen\| indicates the number of bytes 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 all 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); /* * @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_request()`, * `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 * * 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. * * 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 * * 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. * * 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 * * 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. * * .. 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. * * 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); /** * @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 ``6niv`` 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); /* * @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 * * 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 * * 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 * * 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); /** * @function * * Submits HEADERS frame and optionally one or more DATA frames. * * The \|pri_spec\| is 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`. * * 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); /** * @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_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); /** * @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_response()`), 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_response()` is * called, the application has to specify * :type:`nghttp2_data_provider` to `nghttp2_submit_response()`. * Inside of :type:`nghttp2_data_source_read_callback`, 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_callback`. * * 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 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`. * * 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_request()` is useful. Likewise, for HTTP response, * prefer `nghttp2_submit_response()`. * * 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); /* * @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_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); /* * @function * * 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 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`. * * 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); /* * @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_response()`. * * 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_request()` without * consulting this function. In that case, `nghttp2_submit_request()` * 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_callback`. The library will not own * passed \|payload\| pointer. * * The application must set :type:`nghttp2_pack_extension_callback` * using `nghttp2_session_callbacks_set_pack_extension_callback()`. * * 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_callback`. * * 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_callback` 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); /* * @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 * * A helper function for dealing with NPN in client side or 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 * * See http://technotes.googlecode.com/git/nextprotoneg.html for more * details about NPN. * * For NPN, to use this method you should do something like:: * * static int select_next_proto_cb(SSL* ssl, * unsigned char *out, unsigned char outlen, const unsigned char in, unsigned int inlen, * void arg) { * int rv; * rv = nghttp2_select_next_protocol(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_next_proto_select_cb(ssl_ctx, select_next_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 * * 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 / NGHTTP2_EXTERN int nghttp2_check_header_value(const uint8_t value, size_t len); /** * @function * * Returns nonzero if the \|value\| which is supposed to the value of * :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); /** * @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 ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_deflater deflater, uint8_t buf, size_t buflen, const nghttp2_nv nva, size_t nvlen); /** * @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 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); /** * @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_hd2()`, 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; /* * @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); /* * @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) { * 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); /* * @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_send()`, * `nghttp2_session_recv()`, and `nghttp2_session_mem_recv()`. / 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 * * 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 * * 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 * * 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 * * 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 * * 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 * * Returns dependency weight to the parent stream of \|stream\|. / NGHTTP2_EXTERN int32_t nghttp2_stream_get_weight(nghttp2_stream stream); /** * @function * * 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 */	192.36 KB	2024-10-02 19:24
📄 nghttp2ver.h /* * nghttp2 - HTTP/2 C Library * * Copyright (c) 2012, 2013 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 NGHTTP2VER_H #define NGHTTP2VER_H /* * @macro * Version number of the nghttp2 library release / #define NGHTTP2_VERSION "1.43.0" /* * @macro * Numerical representation of the version number of the nghttp2 library * release. This is a 24 bit number with 8 bits for major number, 8 bits * for minor and 8 bits for patch. Version 1.2.3 becomes 0x010203. / #define NGHTTP2_VERSION_NUM 0x012b00 #endif / NGHTTP2VER_H */	1.57 KB	2024-10-02 19:25

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