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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"
/**
* @macro
* default priority value
*/
#define NGHTTP2_PRI_DEFAULT (1 << 30)
#define NGHTTP2_PRI_LOWEST ((1U << 31) - 1)
#define NGHTTP2_MAX_FRAME_SIZE ((1 << 16) - 1)
#define NGHTTP2_STREAM_ID_MASK 0x7fffffff
#define NGHTTP2_PRIORITY_MASK 0x7fffffff
#define NGHTTP2_WINDOW_SIZE_INCREMENT_MASK 0x7fffffff
#define NGHTTP2_SETTINGS_ID_MASK 0xffffff
/* 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
/* Category of frames. */
typedef enum {
/* non-DATA frame */
NGHTTP2_CAT_CTRL,
/* DATA frame */
NGHTTP2_CAT_DATA
} nghttp2_frame_category;
#define nghttp2_frame_get_nv_len(RED) nghttp2_buffer_reader_uint16(RED)
#define nghttp2_frame_put_nv_len(OUT, VAL) nghttp2_put_uint16be(OUT, VAL)
/**
* @struct
* The DATA frame. It has the following members:
*/
typedef struct {
nghttp2_frame_hd hd;
/**
* 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;
/**
* The data to be sent for this DATA frame.
*/
nghttp2_data_provider data_prd;
} nghttp2_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);
/*
* 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 be
* freed. |*buf_ptr| and |*buflen_ptr| are updated accordingly.
*
* frame->hd.length is assigned after length is determined during
* packing process.
*
* 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_headers(uint8_t **buf_ptr,
size_t *buflen_ptr,
nghttp2_headers *frame,
nghttp2_hd_context *deflater);
/*
* Unpacks HEADERS frame byte sequence into |frame|. The control
* frame header is given in |head| with |headlen| length. In the spec,
* headlen is 8 bytes. |payload| is the data after frame header and
* just before name/value header block.
*
* The |inflater| inflates name/value header block.
*
* This function also validates the name/value pairs. If unpacking
* succeeds but validation fails, it is indicated by returning
* NGHTTP2_ERR_INVALID_HEADER_BLOCK.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_HEADER_COMP
* The inflate operation failed.
* NGHTTP2_ERR_INVALID_HEADER_BLOCK
* Unpacking succeeds but the header block is invalid.
* NGHTTP2_ERR_INVALID_FRAME
* The input data are invalid.
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_unpack_headers(nghttp2_headers *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
nghttp2_hd_context *inflater);
/*
* 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_INVALID_FRAME
* The input data are invalid.
*/
int nghttp2_frame_unpack_headers_without_nv(nghttp2_headers *frame,
const uint8_t *head,
size_t headlen,
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|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_INVALID_FRAME
* The input data are invalid.
*/
int nghttp2_frame_unpack_priority(nghttp2_priority *frame,
const uint8_t *head, size_t headlen,
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|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_INVALID_FRAME
* The input data are invalid.
*/
int nghttp2_frame_unpack_rst_stream(nghttp2_rst_stream *frame,
const uint8_t *head, size_t headlen,
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);
/*
* Unpacks SETTINGS wire format into |frame|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_INVALID_FRAME
* The input data are invalid.
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_unpack_settings(nghttp2_settings *frame,
const uint8_t *head, size_t headlen,
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|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_INVALID_FRAME
* The input data are invalid.
*/
int nghttp2_frame_unpack_ping(nghttp2_ping *frame,
const uint8_t *head, size_t headlen,
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|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_INVALID_FRAME
* The input data are invalid.
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_frame_unpack_goaway(nghttp2_goaway *frame,
const uint8_t *head, size_t headlen,
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|. In SPDY/3 spec, WINDOW_UPDATE 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_window_update(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_window_update *frame);
/*
* Unpacks WINDOW_UPDATE frame byte sequence into |frame|.
*
* This function returns 0 if it succeeds or one of the following
* negative error codes:
*
* NGHTTP2_ERR_INVALID_FRAME
* The input data are invalid.
*/
int nghttp2_frame_unpack_window_update(nghttp2_window_update *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload,
size_t payloadlen);
/*
* Returns number of bytes to pack name/value pairs |nv|. This
* function expects |nv| is sorted in ascending order of key.
* |len_size| is the number of bytes in length of name/value pair and
* it must be 2 or 4.
*
* This function can handles duplicate keys and concatenation of thier
* values with '\0'.
*/
size_t nghttp2_frame_count_nv_space(char **nv, size_t len_size);
/*
* Packs name/value pairs in |nv| in |buf|. |buf| must have at least
* nghttp2_frame_count_nv_space(nv) bytes. |len_size| is the number
* of bytes in length of name/value pair and it must be 2 or 4.
*/
ssize_t nghttp2_frame_pack_nv(uint8_t *buf, char **nv, size_t len_size);
/*
* 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 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,
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, uint8_t flags,
int32_t stream_id,
const nghttp2_data_provider *data_prd);
void nghttp2_frame_data_free(nghttp2_data *frame);
/*
* Deallocates memory of name/value pair |nv|.
*/
void nghttp2_frame_nv_del(char **nv);
/*
* Makes a deep copy of |nv| and returns the copy. This function
* returns the pointer to the copy if it succeeds, or NULL. To free
* allocated memory, use nghttp2_frame_nv_del().
*/
char** nghttp2_frame_nv_copy(const char **nv);
/*
* Sorts |nv| in the ascending order of name.
*/
void nghttp2_frame_nv_sort(char **nv);
/*
* Makes names in |nv| lower cased.
*/
void nghttp2_frame_nv_downcase(char **nv);
/*
* This function first makes a copy of |nv| using
* nghttp2_frame_nv_copy(). If it succeeds, then call
* nghttp2_frame_nv_downcase() and nghttp2_frame_nv_sort() with the
* copied name/value pairs.
*
* This function returns the copied name/value pairs if it succeeds,
* or NULL.
*/
char** nghttp2_frame_nv_norm_copy(const char **nv);
/*
* 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 |iv| with the ascending order of the settings_id member.
* The number of the element in the array pointed by the |iv| is given
* by the |niv|.
*/
void nghttp2_frame_iv_sort(nghttp2_settings_entry *iv, size_t niv);
/*
* Returns the offset of the name/header block in the frame, including
* frame header. The |head| is frame header. If the indicated frame
* type does not have header block, this function returns -1.
*/
ssize_t nghttp2_frame_nv_offset(const uint8_t *head);
/*
* Checks names are not empty string and do not contain control
* characters and values are not NULL.
*
* This function returns nonzero if it succeeds, or 0.
*/
int nghttp2_frame_nv_check_null(const char **nv);
/*
* Sorts the |nva| in ascending order of name. The relative order of
* the same name pair is undefined.
*/
void nghttp2_nv_array_sort(nghttp2_nv *nva, size_t nvlen);
/*
* Copies name/value pairs from |nv| to |*nva_ptr|, which is
* dynamically allocated so that all items can be stored.
*
* 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 |nv| is strictly larger than (1
* << 16) - 1.
*/
ssize_t nghttp2_nv_array_from_cstr(nghttp2_nv **nva_ptr, const char **nv);
/*
* 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 names are not empty string and do not contain control
* characters and values are not NULL.
*
* This function returns nonzero if it succeeds, or 0.
*/
int nghttp2_nv_array_check_null(nghttp2_nv *nva, size_t nvlen);
#endif /* NGHTTP2_FRAME_H */
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