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nghttp2/lib/nghttp2_frame.h

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 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_FRAME_H
#define NGHTTP2_FRAME_H
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */
#include <nghttp2/nghttp2.h>
#include "nghttp2_hd.h"
#include "nghttp2_buf.h"
#define NGHTTP2_STREAM_ID_MASK ((1u << 31) - 1)
#define NGHTTP2_PRI_GROUP_ID_MASK ((1u << 31) - 1)
#define NGHTTP2_PRIORITY_MASK ((1u << 31) - 1)
#define NGHTTP2_WINDOW_SIZE_INCREMENT_MASK ((1u << 31) - 1)
#define NGHTTP2_SETTINGS_ID_MASK ((1 << 24) - 1)
/* The number of bytes of frame header. */
#define NGHTTP2_FRAME_HDLEN 9
#define NGHTTP2_MAX_FRAME_SIZE_MAX ((1 << 24) - 1)
#define NGHTTP2_MAX_FRAME_SIZE_MIN (1 << 14)
#define NGHTTP2_MAX_PAYLOADLEN 16384
/* The one frame buffer length for tranmission. We may use several of
them to support CONTINUATION. To account for Pad Length field, we
allocate extra 1 byte, which saves extra large memcopying. */
#define NGHTTP2_FRAMEBUF_CHUNKLEN \
(NGHTTP2_FRAME_HDLEN + 1 + NGHTTP2_MAX_PAYLOADLEN)
/* Number of inbound buffer */
#define NGHTTP2_FRAMEBUF_MAX_NUM 5
/* The default length of DATA frame payload. */
#define NGHTTP2_DATA_PAYLOADLEN NGHTTP2_MAX_FRAME_SIZE_MIN
/* Maximum headers payload length, calculated in compressed form.
This applies to transmission only. */
#define NGHTTP2_MAX_HEADERSLEN 65536
/* The number of bytes for each SETTINGS entry */
#define NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH 6
/* Length of priority related fields in HEADERS/PRIORITY frames */
#define NGHTTP2_PRIORITY_SPECLEN 5
/* Maximum length of padding in bytes. */
#define NGHTTP2_MAX_PADLEN 256
/* Union of extension frame payload */
typedef union { int dummy; } nghttp2_ext_frame_payload;
void nghttp2_frame_pack_frame_hd(uint8_t *buf, const nghttp2_frame_hd *hd);
void nghttp2_frame_unpack_frame_hd(nghttp2_frame_hd *hd, const uint8_t *buf);
/**
* Initializes frame header |hd| with given parameters. Reserved bit
* is set to 0.
*/
void nghttp2_frame_hd_init(nghttp2_frame_hd *hd, size_t length, uint8_t type,
uint8_t flags, int32_t stream_id);
/**
* Returns the number of priority field depending on the |flags|. If
* |flags| has neither NGHTTP2_FLAG_PRIORITY_GROUP nor
* NGHTTP2_FLAG_PRIORITY_DEPENDENCY set, return 0.
*/
size_t nghttp2_frame_priority_len(uint8_t flags);
/**
* Packs the |pri_spec| in |buf|. This function assumes |buf| has
* enough space for serialization.
*/
void nghttp2_frame_pack_priority_spec(uint8_t *buf,
const nghttp2_priority_spec *pri_spec);
/**
* Unpacks the priority specification from payload |payload| of length
* |payloadlen| to |pri_spec|. The |flags| is used to determine what
* kind of priority specification is in |payload|. This function
* assumes the |payload| contains whole priority specification.
*/
void nghttp2_frame_unpack_priority_spec(nghttp2_priority_spec *pri_spec,
uint8_t flags, const uint8_t *payload,
size_t payloadlen);
/*
* Returns the offset from the HEADERS frame payload where the
* compressed header block starts. The frame payload does not include
* frame header.
*/
size_t nghttp2_frame_headers_payload_nv_offset(nghttp2_headers *frame);
/*
* Packs HEADERS frame |frame| in wire format and store it in |bufs|.
* This function expands |bufs| as necessary to store frame.
*
* The caller must make sure that nghttp2_bufs_reset(bufs) is called
* before calling this function.
*
* frame->hd.length is assigned after length is determined during
* packing process. CONTINUATION frames are also serialized in this
* function. This function does not handle padding.
*
* This function returns 0 if it succeeds, or returns one of the
* following negative error codes:
*
* NGHTTP2_ERR_HEADER_COMP
* The deflate operation failed.
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_pack_headers(nghttp2_bufs *bufs, nghttp2_headers *frame,
nghttp2_hd_deflater *deflater);
/*
* Unpacks HEADERS frame byte sequence into |frame|. This function
* only unapcks bytes that come before name/value header block and
* after possible Pad Length field.
*
* This function always succeeds and returns 0.
*/
int nghttp2_frame_unpack_headers_payload(nghttp2_headers *frame,
const uint8_t *payload,
size_t payloadlen);
/*
* Packs PRIORITY frame |frame| in wire format and store it in
* |bufs|.
*
* The caller must make sure that nghttp2_bufs_reset(bufs) is called
* before calling this function.
*
* This function always succeeds and returns 0.
*/
int nghttp2_frame_pack_priority(nghttp2_bufs *bufs, nghttp2_priority *frame);
/*
* Unpacks PRIORITY wire format into |frame|.
*/
void nghttp2_frame_unpack_priority_payload(nghttp2_priority *frame,
const uint8_t *payload,
size_t payloadlen);
/*
* Packs RST_STREAM frame |frame| in wire frame format and store it in
* |bufs|.
*
* The caller must make sure that nghttp2_bufs_reset(bufs) is called
* before calling this function.
*
* This function always succeeds and returns 0.
*/
int nghttp2_frame_pack_rst_stream(nghttp2_bufs *bufs,
nghttp2_rst_stream *frame);
/*
* Unpacks RST_STREAM frame byte sequence into |frame|.
*/
void nghttp2_frame_unpack_rst_stream_payload(nghttp2_rst_stream *frame,
const uint8_t *payload,
size_t payloadlen);
/*
* Packs SETTINGS frame |frame| in wire format and store it in
* |bufs|.
*
* The caller must make sure that nghttp2_bufs_reset(bufs) is called
* before calling this function.
*
* This function returns 0 if it succeeds, or returns one of the
* following negative error codes:
*
* NGHTTP2_ERR_FRAME_SIZE_ERROR
* The length of the frame is too large.
*/
int nghttp2_frame_pack_settings(nghttp2_bufs *bufs, nghttp2_settings *frame);
/*
* Packs the |iv|, which includes |niv| entries, in the |buf|,
* assuming the |buf| has at least 8 * |niv| bytes.
*
* Returns the number of bytes written into the |buf|.
*/
size_t nghttp2_frame_pack_settings_payload(uint8_t *buf,
const nghttp2_settings_entry *iv,
size_t niv);
void nghttp2_frame_unpack_settings_entry(nghttp2_settings_entry *iv,
const uint8_t *payload);
/*
* Makes a copy of |iv| in frame->settings.iv. The |niv| is assigned
* to frame->settings.niv.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_unpack_settings_payload(nghttp2_settings *frame,
nghttp2_settings_entry *iv,
size_t niv, nghttp2_mem *mem);
/*
* Unpacks SETTINGS payload into |*iv_ptr|. The number of entries are
* assigned to the |*niv_ptr|. This function allocates enough memory
* to store the result in |*iv_ptr|. The caller is responsible to free
* |*iv_ptr| after its use.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_unpack_settings_payload2(nghttp2_settings_entry **iv_ptr,
size_t *niv_ptr,
const uint8_t *payload,
size_t payloadlen, nghttp2_mem *mem);
/*
* Packs PUSH_PROMISE frame |frame| in wire format and store it in
* |bufs|. This function expands |bufs| as necessary to store
* frame.
*
* The caller must make sure that nghttp2_bufs_reset(bufs) is called
* before calling this function.
*
* frame->hd.length is assigned after length is determined during
* packing process. CONTINUATION frames are also serialized in this
* function. This function does not handle padding.
*
* This function returns 0 if it succeeds, or returns one of the
* following negative error codes:
*
* NGHTTP2_ERR_HEADER_COMP
* The deflate operation failed.
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_pack_push_promise(nghttp2_bufs *bufs,
nghttp2_push_promise *frame,
nghttp2_hd_deflater *deflater);
/*
* Unpacks PUSH_PROMISE frame byte sequence into |frame|. This
* function only unapcks bytes that come before name/value header
* block and after possible Pad Length field.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_PROTO
* TODO END_HEADERS flag is not set
*/
int nghttp2_frame_unpack_push_promise_payload(nghttp2_push_promise *frame,
const uint8_t *payload,
size_t payloadlen);
/*
* Packs PING frame |frame| in wire format and store it in
* |bufs|.
*
* The caller must make sure that nghttp2_bufs_reset(bufs) is called
* before calling this function.
*
* This function always succeeds and returns 0.
*/
int nghttp2_frame_pack_ping(nghttp2_bufs *bufs, nghttp2_ping *frame);
/*
* Unpacks PING wire format into |frame|.
*/
void nghttp2_frame_unpack_ping_payload(nghttp2_ping *frame,
const uint8_t *payload,
size_t payloadlen);
/*
* Packs GOAWAY frame |frame| in wire format and store it in |bufs|.
* This function expands |bufs| as necessary to store frame.
*
* The caller must make sure that nghttp2_bufs_reset(bufs) is called
* before calling this function.
*
* 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 frame is too large.
*/
int nghttp2_frame_pack_goaway(nghttp2_bufs *bufs, nghttp2_goaway *frame);
/*
* Unpacks GOAWAY wire format into |frame|. The |payload| of length
* |payloadlen| contains first 8 bytes of payload. The
* |var_gift_payload| of length |var_gift_payloadlen| contains
* remaining payload and its buffer is gifted to the function and then
* |frame|. The |var_gift_payloadlen| must be freed by
* nghttp2_frame_goaway_free().
*/
void nghttp2_frame_unpack_goaway_payload(nghttp2_goaway *frame,
const uint8_t *payload,
size_t payloadlen,
uint8_t *var_gift_payload,
size_t var_gift_payloadlen);
/*
* Unpacks GOAWAY wire format into |frame|. This function only exists
* for unit test. After allocating buffer for debug data, this
* function internally calls nghttp2_frame_unpack_goaway_payload().
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_unpack_goaway_payload2(nghttp2_goaway *frame,
const uint8_t *payload,
size_t payloadlen, nghttp2_mem *mem);
/*
* Packs WINDOW_UPDATE frame |frame| in wire frame format and store it
* in |bufs|.
*
* The caller must make sure that nghttp2_bufs_reset(bufs) is called
* before calling this function.
*
* This function always succeeds and returns 0.
*/
int nghttp2_frame_pack_window_update(nghttp2_bufs *bufs,
nghttp2_window_update *frame);
/*
* Unpacks WINDOW_UPDATE frame byte sequence into |frame|.
*/
void nghttp2_frame_unpack_window_update_payload(nghttp2_window_update *frame,
const uint8_t *payload,
size_t payloadlen);
/*
* Initializes HEADERS frame |frame| with given values. |frame| takes
* ownership of |nva|, so caller must not free it. If |stream_id| is
* not assigned yet, it must be -1.
*/
void nghttp2_frame_headers_init(nghttp2_headers *frame, uint8_t flags,
int32_t stream_id, nghttp2_headers_category cat,
const nghttp2_priority_spec *pri_spec,
nghttp2_nv *nva, size_t nvlen);
void nghttp2_frame_headers_free(nghttp2_headers *frame, nghttp2_mem *mem);
void nghttp2_frame_priority_init(nghttp2_priority *frame, int32_t stream_id,
const nghttp2_priority_spec *pri_spec);
void nghttp2_frame_priority_free(nghttp2_priority *frame);
void nghttp2_frame_rst_stream_init(nghttp2_rst_stream *frame, int32_t stream_id,
uint32_t error_code);
void nghttp2_frame_rst_stream_free(nghttp2_rst_stream *frame);
/*
* Initializes PUSH_PROMISE frame |frame| with given values. |frame|
* takes ownership of |nva|, so caller must not free it.
*/
void nghttp2_frame_push_promise_init(nghttp2_push_promise *frame, uint8_t flags,
int32_t stream_id,
int32_t promised_stream_id,
nghttp2_nv *nva, size_t nvlen);
void nghttp2_frame_push_promise_free(nghttp2_push_promise *frame,
nghttp2_mem *mem);
/*
* Initializes SETTINGS frame |frame| with given values. |frame| takes
* ownership of |iv|, so caller must not free it. The |flags| are
* bitwise-OR of one or more of nghttp2_settings_flag.
*/
void nghttp2_frame_settings_init(nghttp2_settings *frame, uint8_t flags,
nghttp2_settings_entry *iv, size_t niv);
void nghttp2_frame_settings_free(nghttp2_settings *frame, nghttp2_mem *mem);
/*
* Initializes PING frame |frame| with given values. If the
* |opqeue_data| is not NULL, it must point to 8 bytes memory region
* of data. The data pointed by |opaque_data| is copied. It can be
* NULL. In this case, 8 bytes NULL is used.
*/
void nghttp2_frame_ping_init(nghttp2_ping *frame, uint8_t flags,
const uint8_t *opque_data);
void nghttp2_frame_ping_free(nghttp2_ping *frame);
/*
* Initializes GOAWAY frame |frame| with given values. On success,
* this function takes ownership of |opaque_data|, so caller must not
* free it. If the |opaque_data_len| is 0, opaque_data could be NULL.
*/
void nghttp2_frame_goaway_init(nghttp2_goaway *frame, int32_t last_stream_id,
uint32_t error_code, uint8_t *opaque_data,
size_t opaque_data_len);
void nghttp2_frame_goaway_free(nghttp2_goaway *frame, nghttp2_mem *mem);
void nghttp2_frame_window_update_init(nghttp2_window_update *frame,
uint8_t flags, int32_t stream_id,
int32_t window_size_increment);
void nghttp2_frame_window_update_free(nghttp2_window_update *frame);
void nghttp2_frame_extension_init(nghttp2_extension *frame, uint8_t type,
uint8_t flags, int32_t stream_id,
void *payload);
void nghttp2_frame_extension_free(nghttp2_extension *frame);
/*
* Returns the number of padding bytes after payload. The total
* padding length is given in the |padlen|. The returned value does
* not include the Pad Length field. If |padlen| is 0, this function
* returns 0, regardless of frame->hd.flags.
*/
size_t nghttp2_frame_trail_padlen(nghttp2_frame *frame, size_t padlen);
void nghttp2_frame_data_init(nghttp2_data *frame, uint8_t flags,
int32_t stream_id);
void nghttp2_frame_data_free(nghttp2_data *frame);
/*
* Makes copy of |iv| and return the copy. The |niv| is the number of
* entries in |iv|. This function returns the pointer to the copy if
* it succeeds, or NULL.
*/
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 */
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