542 lines
18 KiB
C
542 lines
18 KiB
C
/*
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* nghttp2 - HTTP/2.0 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_FRAME_LENGTH_MASK ((1 << 14) - 1)
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#define NGHTTP2_STREAM_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 8
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/* The maximum frame and payload length. The spec allows maximum
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payload length up to 16383 bytes. Due to efficient buffer
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allocation, we choose smaller buffer. Actual payload limit offsets
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frame header and possible PAD_HIGH and PAD_LOW to ease
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serialization and save memcopying. */
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#define NGHTTP2_MAX_FRAMELEN 8192
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#define NGHTTP2_MAX_PAYLOADLEN (NGHTTP2_MAX_FRAMELEN - NGHTTP2_FRAME_HDLEN - 2)
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/* The maximum length of DATA frame payload. To fit entire DATA frame
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into 4096K buffer, we use subtract header size (8 bytes) + 2 bytes
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padding. See nghttp2_session_pack_data(). */
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#define NGHTTP2_DATA_PAYLOAD_LENGTH (4096 - NGHTTP2_FRAME_HDLEN - 2)
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/* The number of bytes for each SETTINGS entry */
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#define NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH 5
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/* Category of frames. */
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typedef enum {
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/* non-DATA frame */
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NGHTTP2_CAT_CTRL,
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/* DATA frame */
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NGHTTP2_CAT_DATA
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} nghttp2_frame_category;
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/**
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* @struct
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*
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* The DATA frame used in the library privately. It has the following
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* members:
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*/
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typedef struct {
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nghttp2_frame_hd hd;
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/**
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* The data to be sent for this DATA frame.
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*/
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nghttp2_data_provider data_prd;
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/**
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* The number of bytes added as padding. This includes PAD_HIGH and
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* PAD_LOW.
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*/
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size_t padlen;
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/**
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* The flag to indicate whether EOF was reached or not. Initially
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* |eof| is 0. It becomes 1 after all data were read. This is used
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* exclusively by nghttp2 library and not in the spec.
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*/
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uint8_t eof;
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} nghttp2_private_data;
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int nghttp2_frame_is_data_frame(uint8_t *head);
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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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* 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_FRAME_SIZE_ERROR
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* The length of the frame is too large.
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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,
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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.
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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_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 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_pack_priority(nghttp2_bufs *bufs,
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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 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_NOMEM
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* Out of memory.
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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_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_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);
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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);
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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_FRAME_SIZE_ERROR
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* The length of the frame is too large.
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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 function
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* only unapcks bytes that come before name/value header block.
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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 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_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);
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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 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_NOMEM
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* Out of memory.
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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,
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uint8_t flags, int32_t stream_id, int32_t pri,
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nghttp2_nv *nva, size_t nvlen);
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void nghttp2_frame_headers_free(nghttp2_headers *frame);
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void nghttp2_frame_priority_init(nghttp2_priority *frame, int32_t stream_id,
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int32_t pri);
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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,
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int32_t stream_id,
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nghttp2_error_code 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,
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uint8_t flags, 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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/*
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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);
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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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nghttp2_error_code error_code,
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uint8_t *opaque_data, size_t opaque_data_len);
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void nghttp2_frame_goaway_free(nghttp2_goaway *frame);
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void nghttp2_frame_window_update_init(nghttp2_window_update *frame,
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uint8_t flags,
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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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void nghttp2_frame_data_init(nghttp2_data *frame, nghttp2_private_data *pdata);
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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_HIGH and PAD_LOW.
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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_private_data_init(nghttp2_private_data *frame,
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uint8_t flags,
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int32_t stream_id,
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const nghttp2_data_provider *data_prd);
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void nghttp2_frame_private_data_free(nghttp2_private_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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*/
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nghttp2_settings_entry* nghttp2_frame_iv_copy(const nghttp2_settings_entry *iv,
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size_t niv);
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/*
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* Sorts the |nva| in ascending order of name and value. If names are
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* equivalent, sort them by value.
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*/
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void nghttp2_nv_array_sort(nghttp2_nv *nva, size_t nvlen);
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/*
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* Copies name/value pairs from |nva|, which contains |nvlen| pairs,
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* to |*nva_ptr|, which is dynamically allocated so that all items can
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* be stored.
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*
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* The |*nva_ptr| must be freed using nghttp2_nv_array_del().
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*
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* This function returns the number of name/value pairs in |*nva_ptr|,
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* or one of the following 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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ssize_t nghttp2_nv_array_copy(nghttp2_nv **nva_ptr,
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const nghttp2_nv *nva, size_t nvlen);
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/*
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* Returns nonzero if the name/value pair |a| equals to |b|. The name
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* is compared in case-sensitive, because we ensure that this function
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* is called after the name is lower-cased.
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*/
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int nghttp2_nv_equal(const nghttp2_nv *a, const nghttp2_nv *b);
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/*
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* Frees |nva|.
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*/
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void nghttp2_nv_array_del(nghttp2_nv *nva);
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|
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/*
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|
* Checks that the |iv|, which includes |niv| entries, does not have
|
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* invalid values.
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*
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* This function returns nonzero if it succeeds, or 0.
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*/
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int nghttp2_iv_check(const nghttp2_settings_entry *iv, size_t niv);
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/*
|
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* Sets PAD_HIGH and PAD_LOW fields, flags and adjust frame header
|
|
* position of each buffers in |bufs|. The padding is given in the
|
|
* |padlen|. The |hd| is the frame header for the serialized data.
|
|
* The |type| is used as a frame type when padding requires additional
|
|
* buffers.
|
|
*
|
|
* This function returns 0 if it succeeds, or one of the following
|
|
* negative error codes:
|
|
*
|
|
* NGHTTP2_ERR_NOMEM
|
|
* Out of memory.
|
|
* NGHTTP2_ERR_BUFFER_ERROR
|
|
* Out of buffer space. This is not a fatal.
|
|
*/
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int nghttp2_frame_add_pad(nghttp2_bufs *bufs, nghttp2_frame_hd *hd,
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size_t padlen, nghttp2_frame_type type);
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#endif /* NGHTTP2_FRAME_H */
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