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https://github.com/nghttp2/nghttp2.git
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01af6ea70c
HTTP/2 and HPACK are going to be published as RFC, but ALTSVC is still in draft state. To make our API stable, it would be better to remove ALTSVC API for 1.0.0 release.
528 lines
19 KiB
C
528 lines
19 KiB
C
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef NGHTTP2_FRAME_H
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#define NGHTTP2_FRAME_H
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <nghttp2/nghttp2.h>
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#include "nghttp2_hd.h"
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#include "nghttp2_buf.h"
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#define NGHTTP2_STREAM_ID_MASK ((1u << 31) - 1)
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#define NGHTTP2_PRI_GROUP_ID_MASK ((1u << 31) - 1)
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#define NGHTTP2_PRIORITY_MASK ((1u << 31) - 1)
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#define NGHTTP2_WINDOW_SIZE_INCREMENT_MASK ((1u << 31) - 1)
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#define NGHTTP2_SETTINGS_ID_MASK ((1 << 24) - 1)
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/* The number of bytes of frame header. */
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#define NGHTTP2_FRAME_HDLEN 9
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#define NGHTTP2_MAX_FRAME_SIZE_MAX ((1 << 24) - 1)
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#define NGHTTP2_MAX_FRAME_SIZE_MIN (1 << 14)
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#define NGHTTP2_MAX_PAYLOADLEN 16384
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/* The one frame buffer length for tranmission. We may use several of
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them to support CONTINUATION. To account for Pad Length field, we
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allocate extra 1 byte, which saves extra large memcopying. */
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#define NGHTTP2_FRAMEBUF_CHUNKLEN \
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(NGHTTP2_FRAME_HDLEN + 1 + NGHTTP2_MAX_PAYLOADLEN)
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/* Number of inbound buffer */
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#define NGHTTP2_FRAMEBUF_MAX_NUM 5
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/* The default length of DATA frame payload. */
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#define NGHTTP2_DATA_PAYLOADLEN NGHTTP2_MAX_FRAME_SIZE_MIN
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/* Maximum headers payload length, calculated in compressed form.
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This applies to transmission only. */
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#define NGHTTP2_MAX_HEADERSLEN 65536
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/* The number of bytes for each SETTINGS entry */
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#define NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH 6
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/* The maximum header table size in SETTINGS_HEADER_TABLE_SIZE */
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#define NGHTTP2_MAX_HEADER_TABLE_SIZE ((1u << 31) - 1)
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/* Length of priority related fields in HEADERS/PRIORITY frames */
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#define NGHTTP2_PRIORITY_SPECLEN 5
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/* Maximum length of padding in bytes. */
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#define NGHTTP2_MAX_PADLEN 256
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/* Union of extension frame payload */
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typedef union { int dummy; } nghttp2_ext_frame_payload;
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void nghttp2_frame_pack_frame_hd(uint8_t *buf, const nghttp2_frame_hd *hd);
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void nghttp2_frame_unpack_frame_hd(nghttp2_frame_hd *hd, const uint8_t *buf);
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/**
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* Initializes frame header |hd| with given parameters. Reserved bit
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* is set to 0.
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*/
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void nghttp2_frame_hd_init(nghttp2_frame_hd *hd, size_t length, uint8_t type,
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uint8_t flags, int32_t stream_id);
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/**
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* Returns the number of priority field depending on the |flags|. If
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* |flags| has neither NGHTTP2_FLAG_PRIORITY_GROUP nor
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* NGHTTP2_FLAG_PRIORITY_DEPENDENCY set, return 0.
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*/
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size_t nghttp2_frame_priority_len(uint8_t flags);
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/**
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* Packs the |pri_spec| in |buf|. This function assumes |buf| has
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* enough space for serialization.
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*/
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void nghttp2_frame_pack_priority_spec(uint8_t *buf,
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const nghttp2_priority_spec *pri_spec);
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/**
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* Unpacks the priority specification from payload |payload| of length
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* |payloadlen| to |pri_spec|. The |flags| is used to determine what
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* kind of priority specification is in |payload|. This function
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* assumes the |payload| contains whole priority specification.
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*/
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void nghttp2_frame_unpack_priority_spec(nghttp2_priority_spec *pri_spec,
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uint8_t flags, const uint8_t *payload,
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size_t payloadlen);
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/*
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* Returns the offset from the HEADERS frame payload where the
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* compressed header block starts. The frame payload does not include
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* frame header.
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*/
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size_t nghttp2_frame_headers_payload_nv_offset(nghttp2_headers *frame);
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/*
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* Packs HEADERS frame |frame| in wire format and store it in |bufs|.
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* This function expands |bufs| as necessary to store frame.
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*
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* The caller must make sure that nghttp2_bufs_reset(bufs) is called
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* before calling this function.
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*
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* frame->hd.length is assigned after length is determined during
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* packing process. CONTINUATION frames are also serialized in this
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* function. This function does not handle padding.
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*
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* This function returns 0 if it succeeds, or returns one of the
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* following negative error codes:
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*
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* NGHTTP2_ERR_HEADER_COMP
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* The deflate operation failed.
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_frame_pack_headers(nghttp2_bufs *bufs, nghttp2_headers *frame,
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nghttp2_hd_deflater *deflater);
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/*
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* Unpacks HEADERS frame byte sequence into |frame|. This function
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* only unapcks bytes that come before name/value header block and
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* after possible Pad Length field.
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*
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* This function always succeeds and returns 0.
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*/
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int nghttp2_frame_unpack_headers_payload(nghttp2_headers *frame,
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const uint8_t *payload,
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size_t payloadlen);
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/*
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* Packs PRIORITY frame |frame| in wire format and store it in
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* |bufs|.
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*
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* The caller must make sure that nghttp2_bufs_reset(bufs) is called
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* before calling this function.
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*
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* This function always succeeds and returns 0.
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*/
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int nghttp2_frame_pack_priority(nghttp2_bufs *bufs, nghttp2_priority *frame);
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/*
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* Unpacks PRIORITY wire format into |frame|.
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*/
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void nghttp2_frame_unpack_priority_payload(nghttp2_priority *frame,
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const uint8_t *payload,
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size_t payloadlen);
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/*
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* Packs RST_STREAM frame |frame| in wire frame format and store it in
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* |bufs|.
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*
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* The caller must make sure that nghttp2_bufs_reset(bufs) is called
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* before calling this function.
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*
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* This function always succeeds and returns 0.
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*/
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int nghttp2_frame_pack_rst_stream(nghttp2_bufs *bufs,
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nghttp2_rst_stream *frame);
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/*
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* Unpacks RST_STREAM frame byte sequence into |frame|.
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*/
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void nghttp2_frame_unpack_rst_stream_payload(nghttp2_rst_stream *frame,
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const uint8_t *payload,
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size_t payloadlen);
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/*
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* Packs SETTINGS frame |frame| in wire format and store it in
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* |bufs|.
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*
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* The caller must make sure that nghttp2_bufs_reset(bufs) is called
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* before calling this function.
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*
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* This function returns 0 if it succeeds, or returns one of the
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* following negative error codes:
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*
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* NGHTTP2_ERR_FRAME_SIZE_ERROR
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* The length of the frame is too large.
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*/
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int nghttp2_frame_pack_settings(nghttp2_bufs *bufs, nghttp2_settings *frame);
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/*
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* Packs the |iv|, which includes |niv| entries, in the |buf|,
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* assuming the |buf| has at least 8 * |niv| bytes.
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*
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* Returns the number of bytes written into the |buf|.
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*/
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size_t nghttp2_frame_pack_settings_payload(uint8_t *buf,
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const nghttp2_settings_entry *iv,
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size_t niv);
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void nghttp2_frame_unpack_settings_entry(nghttp2_settings_entry *iv,
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const uint8_t *payload);
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/*
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* Makes a copy of |iv| in frame->settings.iv. The |niv| is assigned
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* to frame->settings.niv.
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*
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* This function returns 0 if it succeeds or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_frame_unpack_settings_payload(nghttp2_settings *frame,
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nghttp2_settings_entry *iv,
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size_t niv, nghttp2_mem *mem);
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/*
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* Unpacks SETTINGS payload into |*iv_ptr|. The number of entries are
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* assigned to the |*niv_ptr|. This function allocates enough memory
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* to store the result in |*iv_ptr|. The caller is responsible to free
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* |*iv_ptr| after its use.
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*
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* This function returns 0 if it succeeds or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_frame_unpack_settings_payload2(nghttp2_settings_entry **iv_ptr,
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size_t *niv_ptr,
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const uint8_t *payload,
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size_t payloadlen, nghttp2_mem *mem);
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/*
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* Packs PUSH_PROMISE frame |frame| in wire format and store it in
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* |bufs|. This function expands |bufs| as necessary to store
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* frame.
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*
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* The caller must make sure that nghttp2_bufs_reset(bufs) is called
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* before calling this function.
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*
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* frame->hd.length is assigned after length is determined during
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* packing process. CONTINUATION frames are also serialized in this
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* function. This function does not handle padding.
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*
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* This function returns 0 if it succeeds, or returns one of the
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* following negative error codes:
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*
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* NGHTTP2_ERR_HEADER_COMP
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* The deflate operation failed.
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_frame_pack_push_promise(nghttp2_bufs *bufs,
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nghttp2_push_promise *frame,
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nghttp2_hd_deflater *deflater);
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/*
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* Unpacks PUSH_PROMISE frame byte sequence into |frame|. This
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* function only unapcks bytes that come before name/value header
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* block and after possible Pad Length field.
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*
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* This function returns 0 if it succeeds or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_PROTO
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* TODO END_HEADERS flag is not set
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*/
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int nghttp2_frame_unpack_push_promise_payload(nghttp2_push_promise *frame,
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const uint8_t *payload,
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size_t payloadlen);
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/*
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* Packs PING frame |frame| in wire format and store it in
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* |bufs|.
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*
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* The caller must make sure that nghttp2_bufs_reset(bufs) is called
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* before calling this function.
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*
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* This function always succeeds and returns 0.
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*/
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int nghttp2_frame_pack_ping(nghttp2_bufs *bufs, nghttp2_ping *frame);
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/*
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* Unpacks PING wire format into |frame|.
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*/
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void nghttp2_frame_unpack_ping_payload(nghttp2_ping *frame,
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const uint8_t *payload,
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size_t payloadlen);
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/*
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* Packs GOAWAY frame |frame| in wire format and store it in |bufs|.
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* This function expands |bufs| as necessary to store frame.
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*
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* The caller must make sure that nghttp2_bufs_reset(bufs) is called
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* before calling this function.
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*
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* This function returns 0 if it succeeds or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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* NGHTTP2_ERR_FRAME_SIZE_ERROR
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* The length of the frame is too large.
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*/
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int nghttp2_frame_pack_goaway(nghttp2_bufs *bufs, nghttp2_goaway *frame);
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/*
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* Unpacks GOAWAY wire format into |frame|. The |payload| of length
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* |payloadlen| contains first 8 bytes of payload. The
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* |var_gift_payload| of length |var_gift_payloadlen| contains
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* remaining payload and its buffer is gifted to the function and then
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* |frame|. The |var_gift_payloadlen| must be freed by
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* nghttp2_frame_goaway_free().
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*/
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void nghttp2_frame_unpack_goaway_payload(nghttp2_goaway *frame,
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const uint8_t *payload,
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size_t payloadlen,
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uint8_t *var_gift_payload,
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size_t var_gift_payloadlen);
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/*
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* Unpacks GOAWAY wire format into |frame|. This function only exists
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* for unit test. After allocating buffer for debug data, this
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* function internally calls nghttp2_frame_unpack_goaway_payload().
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_frame_unpack_goaway_payload2(nghttp2_goaway *frame,
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const uint8_t *payload,
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size_t payloadlen, nghttp2_mem *mem);
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/*
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* Packs WINDOW_UPDATE frame |frame| in wire frame format and store it
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* in |bufs|.
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*
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* The caller must make sure that nghttp2_bufs_reset(bufs) is called
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* before calling this function.
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*
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* This function always succeeds and returns 0.
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*/
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int nghttp2_frame_pack_window_update(nghttp2_bufs *bufs,
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nghttp2_window_update *frame);
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/*
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* Unpacks WINDOW_UPDATE frame byte sequence into |frame|.
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*/
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void nghttp2_frame_unpack_window_update_payload(nghttp2_window_update *frame,
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const uint8_t *payload,
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size_t payloadlen);
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/*
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* Initializes HEADERS frame |frame| with given values. |frame| takes
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* ownership of |nva|, so caller must not free it. If |stream_id| is
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* not assigned yet, it must be -1.
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*/
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void nghttp2_frame_headers_init(nghttp2_headers *frame, uint8_t flags,
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int32_t stream_id, nghttp2_headers_category cat,
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const nghttp2_priority_spec *pri_spec,
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nghttp2_nv *nva, size_t nvlen);
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void nghttp2_frame_headers_free(nghttp2_headers *frame, nghttp2_mem *mem);
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void nghttp2_frame_priority_init(nghttp2_priority *frame, int32_t stream_id,
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const nghttp2_priority_spec *pri_spec);
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void nghttp2_frame_priority_free(nghttp2_priority *frame);
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void nghttp2_frame_rst_stream_init(nghttp2_rst_stream *frame, int32_t stream_id,
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uint32_t error_code);
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void nghttp2_frame_rst_stream_free(nghttp2_rst_stream *frame);
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/*
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* Initializes PUSH_PROMISE frame |frame| with given values. |frame|
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* takes ownership of |nva|, so caller must not free it.
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*/
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void nghttp2_frame_push_promise_init(nghttp2_push_promise *frame, uint8_t flags,
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int32_t stream_id,
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int32_t promised_stream_id,
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nghttp2_nv *nva, size_t nvlen);
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void nghttp2_frame_push_promise_free(nghttp2_push_promise *frame,
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nghttp2_mem *mem);
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/*
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* Initializes SETTINGS frame |frame| with given values. |frame| takes
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* ownership of |iv|, so caller must not free it. The |flags| are
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* bitwise-OR of one or more of nghttp2_settings_flag.
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*/
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void nghttp2_frame_settings_init(nghttp2_settings *frame, uint8_t flags,
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nghttp2_settings_entry *iv, size_t niv);
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void nghttp2_frame_settings_free(nghttp2_settings *frame, nghttp2_mem *mem);
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/*
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* Initializes PING frame |frame| with given values. If the
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* |opqeue_data| is not NULL, it must point to 8 bytes memory region
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* of data. The data pointed by |opaque_data| is copied. It can be
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* NULL. In this case, 8 bytes NULL is used.
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*/
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void nghttp2_frame_ping_init(nghttp2_ping *frame, uint8_t flags,
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const uint8_t *opque_data);
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void nghttp2_frame_ping_free(nghttp2_ping *frame);
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/*
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* Initializes GOAWAY frame |frame| with given values. On success,
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* this function takes ownership of |opaque_data|, so caller must not
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* free it. If the |opaque_data_len| is 0, opaque_data could be NULL.
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*/
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void nghttp2_frame_goaway_init(nghttp2_goaway *frame, int32_t last_stream_id,
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uint32_t error_code, uint8_t *opaque_data,
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size_t opaque_data_len);
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void nghttp2_frame_goaway_free(nghttp2_goaway *frame, nghttp2_mem *mem);
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void nghttp2_frame_window_update_init(nghttp2_window_update *frame,
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uint8_t flags, int32_t stream_id,
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int32_t window_size_increment);
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void nghttp2_frame_window_update_free(nghttp2_window_update *frame);
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/*
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* Returns the number of padding bytes after payload. The total
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* padding length is given in the |padlen|. The returned value does
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* not include the Pad Length field.
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*/
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size_t nghttp2_frame_trail_padlen(nghttp2_frame *frame, size_t padlen);
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void nghttp2_frame_data_init(nghttp2_data *frame, uint8_t flags,
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int32_t stream_id);
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void nghttp2_frame_data_free(nghttp2_data *frame);
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/*
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* Makes copy of |iv| and return the copy. The |niv| is the number of
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* entries in |iv|. This function returns the pointer to the copy if
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* it succeeds, or NULL.
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*/
|
|
nghttp2_settings_entry *nghttp2_frame_iv_copy(const nghttp2_settings_entry *iv,
|
|
size_t niv, nghttp2_mem *mem);
|
|
|
|
/*
|
|
* Sorts the |nva| in ascending order of name and value. If names are
|
|
* equivalent, sort them by value.
|
|
*/
|
|
void nghttp2_nv_array_sort(nghttp2_nv *nva, size_t nvlen);
|
|
|
|
/*
|
|
* Copies name/value pairs from |nva|, which contains |nvlen| pairs,
|
|
* to |*nva_ptr|, which is dynamically allocated so that all items can
|
|
* be stored. The resultant name and value in nghttp2_nv are
|
|
* guaranteed to be NULL-terminated even if the input is not
|
|
* null-terminated.
|
|
*
|
|
* The |*nva_ptr| must be freed using nghttp2_nv_array_del().
|
|
*
|
|
* This function returns 0 if it succeeds or one of the following
|
|
* negative error codes:
|
|
*
|
|
* NGHTTP2_ERR_NOMEM
|
|
* Out of memory.
|
|
*/
|
|
int nghttp2_nv_array_copy(nghttp2_nv **nva_ptr, const nghttp2_nv *nva,
|
|
size_t nvlen, nghttp2_mem *mem);
|
|
|
|
/*
|
|
* Returns nonzero if the name/value pair |a| equals to |b|. The name
|
|
* is compared in case-sensitive, because we ensure that this function
|
|
* is called after the name is lower-cased.
|
|
*/
|
|
int nghttp2_nv_equal(const nghttp2_nv *a, const nghttp2_nv *b);
|
|
|
|
/*
|
|
* Frees |nva|.
|
|
*/
|
|
void nghttp2_nv_array_del(nghttp2_nv *nva, nghttp2_mem *mem);
|
|
|
|
/*
|
|
* Checks that the |iv|, which includes |niv| entries, does not have
|
|
* invalid values.
|
|
*
|
|
* This function returns nonzero if it succeeds, or 0.
|
|
*/
|
|
int nghttp2_iv_check(const nghttp2_settings_entry *iv, size_t niv);
|
|
|
|
/*
|
|
* Sets Pad Length field and flags and adjusts frame header position
|
|
* of each buffers in |bufs|. The number of padding is given in the
|
|
* |padlen| including Pad Length field. The |hd| is the frame header
|
|
* for the serialized data. This function fills zeros padding region
|
|
* unless framehd_only is nonzero.
|
|
*
|
|
* This function returns 0 if it succeeds, or one of the following
|
|
* negative error codes:
|
|
*
|
|
* NGHTTP2_ERR_NOMEM
|
|
* Out of memory.
|
|
* NGHTTP2_ERR_FRAME_SIZE_ERROR
|
|
* The length of the resulting frame is too large.
|
|
*/
|
|
int nghttp2_frame_add_pad(nghttp2_bufs *bufs, nghttp2_frame_hd *hd,
|
|
size_t padlen, int framehd_only);
|
|
|
|
#endif /* NGHTTP2_FRAME_H */
|