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nghttp2/lib/nghttp2_frame.h

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/*
* nghttp2 - HTTP/2.0 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_buffer.h"
#define NGHTTP2_FRAME_LENGTH_MASK ((1 << 14) - 1)
#define NGHTTP2_STREAM_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 maximum payload length of a frame */
#define NGHTTP2_MAX_FRAME_LENGTH ((1 << 14) - 1)
/* The maximum length of DATA frame payload. */
#define NGHTTP2_DATA_PAYLOAD_LENGTH 4096
/* The number of bytes of frame header. */
#define NGHTTP2_FRAME_HEAD_LENGTH 8
/* The number of bytes for each SETTINGS entry */
#define NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH 5
/* Category of frames. */
typedef enum {
/* non-DATA frame */
NGHTTP2_CAT_CTRL,
/* DATA frame */
NGHTTP2_CAT_DATA
} nghttp2_frame_category;
/**
* @struct
*
* The DATA frame used in the library privately. It has the following
* members:
*/
typedef struct {
nghttp2_frame_hd hd;
/**
* The data to be sent for this DATA frame.
*/
nghttp2_data_provider data_prd;
/**
* The number of bytes added as padding. This includes PAD_HIGH and
* PAD_LOW.
*/
size_t padlen;
/**
* The flag to indicate whether EOF was reached or not. Initially
* |eof| is 0. It becomes 1 after all data were read. This is used
* exclusively by nghttp2 library and not in the spec.
*/
uint8_t eof;
} nghttp2_private_data;
int nghttp2_frame_is_data_frame(uint8_t *head);
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);
/*
* 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
* |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr| bytes.
* This function expands |*buf_ptr| as necessary to store frame. When
* expansion occurred, memory previously pointed by |*buf_ptr| may
* change. |*buf_ptr| and |*buflen_ptr| are updated accordingly.
*
* The first byte the frame is serialized is returned in the
* |*bufoff_ptr|. Currently, it is always 2 to account for possible
* PAD_HIGH and PAD_LOW.
*
* frame->hd.length is assigned after length is determined during
* packing process. If payload length is strictly larger than
* NGHTTP2_MAX_FRAME_LENGTH, payload data is still serialized as is,
* but frame->hd.length is set to NGHTTP2_MAX_FRAME_LENGTH and
* NGHTTP2_FLAG_END_HEADERS flag is cleared from frame->hd.flags.
*
* This function returns the size of packed frame (which includes
* |*bufoff_ptr| bytes) if it succeeds, or returns one of the
* following negative error codes:
*
* NGHTTP2_ERR_HEADER_COMP
* The deflate operation failed.
* NGHTTP2_ERR_FRAME_TOO_LARGE
* The length of the frame is too large.
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
ssize_t nghttp2_frame_pack_headers(uint8_t **buf_ptr,
size_t *buflen_ptr,
size_t *bufoff_ptr,
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.
*
* 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_headers_payload(nghttp2_headers *frame,
const uint8_t *payload,
size_t payloadlen);
/*
* Packs PRIORITY frame |frame| in wire format and store it in
* |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr|
* length. This function expands |*buf_ptr| as necessary to store
* given |frame|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
ssize_t nghttp2_frame_pack_priority(uint8_t **buf_ptr, size_t *buflen_ptr,
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
* |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr|
* length. This function expands |*buf_ptr| as necessary to store
* given |frame|. In spdy/2 spec, RST_STREAM wire format is always 16
* bytes long.
*
* This function returns the size of packed frame if it succeeds, or
* returns one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
ssize_t nghttp2_frame_pack_rst_stream(uint8_t **buf_ptr, size_t *buflen_ptr,
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
* |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr|
* length. This function expands |*buf_ptr| as necessary to store
* given |frame|.
*
* This function returns the size of packed frame if it succeeds, or
* returns one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
ssize_t nghttp2_frame_pack_settings(uint8_t **buf_ptr, size_t *buflen_ptr,
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);
/*
* 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);
/*
* Packs PUSH_PROMISE frame |frame| in wire format and store it in
* |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr| bytes.
* This function expands |*buf_ptr| as necessary to store frame. When
* expansion occurred, memory previously pointed by |*buf_ptr| may
* change. |*buf_ptr| and |*buflen_ptr| are updated accordingly.
*
* frame->hd.length is assigned after length is determined during
* packing process. If payload length is strictly larger than
* NGHTTP2_MAX_FRAME_LENGTH, payload data is still serialized as is,
* but frame->hd.length is set to NGHTTP2_MAX_FRAME_LENGTH and
* NGHTTP2_FLAG_END_HEADERS flag is cleared from frame->hd.flags.
*
* This function returns the size of packed frame if it succeeds, or
* returns one of the following negative error codes:
*
* NGHTTP2_ERR_HEADER_COMP
* The deflate operation failed.
* NGHTTP2_ERR_FRAME_TOO_LARGE
* The length of the frame is too large.
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
ssize_t nghttp2_frame_pack_push_promise(uint8_t **buf_ptr,
size_t *buflen_ptr,
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.
*
* 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
* |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr|
* length. This function expands |*buf_ptr| as necessary to store
* given |frame|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
ssize_t nghttp2_frame_pack_ping(uint8_t **buf_ptr, size_t *buflen_ptr,
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
* |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr|
* length. This function expands |*buf_ptr| as necessary to store
* given |frame|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
ssize_t nghttp2_frame_pack_goaway(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_goaway *frame);
/*
* Unpacks GOAWAY wire format into |frame|.
*/
void nghttp2_frame_unpack_goaway_payload(nghttp2_goaway *frame,
const uint8_t *payload,
size_t payloadlen);
/*
* Packs WINDOW_UPDATE frame |frame| in wire frame format and store it
* in |*buf_ptr|. The capacity of |*buf_ptr| is |*buflen_ptr|
* length. This function expands |*buf_ptr| as necessary to store
* given |frame|.
*
* This function returns the size of packed frame if it succeeds, or
* returns one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
ssize_t nghttp2_frame_pack_window_update(uint8_t **buf_ptr, size_t *buflen_ptr,
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, int32_t pri,
nghttp2_nv *nva, size_t nvlen);
void nghttp2_frame_headers_free(nghttp2_headers *frame);
void nghttp2_frame_priority_init(nghttp2_priority *frame, int32_t stream_id,
int32_t pri);
void nghttp2_frame_priority_free(nghttp2_priority *frame);
void nghttp2_frame_rst_stream_init(nghttp2_rst_stream *frame,
int32_t stream_id,
nghttp2_error_code 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);
/*
* 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);
/*
* 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,
nghttp2_error_code error_code,
uint8_t *opaque_data, size_t opaque_data_len);
void nghttp2_frame_goaway_free(nghttp2_goaway *frame);
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_data_init(nghttp2_data *frame, nghttp2_private_data *pdata);
/*
* 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_HIGH and PAD_LOW.
*/
size_t nghttp2_frame_trail_padlen(nghttp2_frame *frame, size_t padlen);
void nghttp2_frame_private_data_init(nghttp2_private_data *frame,
uint8_t flags,
int32_t stream_id,
const nghttp2_data_provider *data_prd);
void nghttp2_frame_private_data_free(nghttp2_private_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);
/*
* 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 |*nva_ptr| must be freed using nghttp2_nv_array_del().
*
* This function returns the number of name/value pairs in |*nva_ptr|,
* or one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
* NGHTTP2_ERR_INVALID_ARGUMENT
* The length of name or value in |nva| is strictly larger than
* NGHTTP2_MAX_HD_VALUE_LENGTH.
*/
ssize_t nghttp2_nv_array_copy(nghttp2_nv **nva_ptr,
const nghttp2_nv *nva, size_t nvlen);
/*
* 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);
/*
* 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);
/*
* Add padding to the payload in the |*buf_ptr| of length
* |*buflen_ptr|. The payload length is given in |payloadlen|. The
* frame header starts at offset |*bufoff_ptr|. Therefore, the payload
* must start at offset *bufoff_ptr + NGHTTP2_FRAME_HEAD_LENGTH from
* |*buf_ptr| to account for PAD_HIGH and PAD_LOW. The padding is
* given in the |padlen|.
*
* The |*flags_ptr| is updated to include NGHTTP2_FLAG_PAD_LOW and
* NGHTTP2_FLAG_PAD_HIGH based on the padding length. The
* |*bufoff_ptr| will have the offset starting the frame header in
* |*buf_ptr|.
*
* The |*buf_ptr| and |*buflen_ptr| may be extended to include padding
* bytes.
*
* The padding specifier PAD_HIGH and PAD_LOW are located right after
* the frame header. But they may not be there depending of the length
* of the padding. To save the additional buffer copy, we allocate
* buffer size as if these 2 bytes always exist. Depending of the
* length of the padding, we move the location of frame header and
* adjust |*bufoff_ptr|. If more than or equal to 256 padding is made,
* the |*bufoff_ptr| is 0 and the content of the |*buf_ptr| looks like
* this:
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Frame header ...
* +---------------------------------------------------------------+
* . Frame header |
* +---------------+---------------+-------------------------------+
* | Pad high | Pad low | Payload ...
* +---------------+---------------+-------------------------------+
*
*
* If padding is less than 256 but strictly more than 0, the
* |*bufoff_ptr| is 1 and the |*buf_ptr| looks like this:
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Unused | Frame header ...
* +---------------+-----------------------------------------------+
* . Frame header ...
* +---------------+---------------+-------------------------------+
* . Frame Header | Pad low | Payload ...
* +---------------+---------------+-------------------------------+
*
* If no padding is added, the |*bufoff_ptr| is 2 and the |*buf_ptr|
* looks like this:
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Unused | Frame header ...
* +-------------------------------+-------------------------------+
* . Frame header ...
* +-------------------------------+-------------------------------+
* . Frame Header | Payload ...
* +-------------------------------+-------------------------------+
*
* Notice that the position of payload does not change. This way, we
* can set PAD_HIGH and PAD_LOW after payload was serialized and no
* additional copy operation is required (if the |*buf_ptr| is large
* enough to account the additional padding, of course).
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_add_pad(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *bufoff_ptr, uint8_t *flags_ptr,
size_t payloadlen, size_t padlen);
#endif /* NGHTTP2_FRAME_H */
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