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nghttp2/lib/includes/spdylay/spdylay.h

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/*
* Spdylay - SPDY 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 SPDYLAY_H
#define SPDYLAY_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <spdylay/spdylayver.h>
struct spdylay_session;
typedef struct spdylay_session spdylay_session;
/* SPDY protocol version 2 */
#define SPDYLAY_PROTO_VERSION 2
typedef enum {
SPDYLAY_ERR_INVALID_ARGUMENT = -501,
SPDYLAY_ERR_ZLIB = -502,
SPDYLAY_ERR_WOULDBLOCK = -504,
SPDYLAY_ERR_PROTO = -505,
SPDYLAY_ERR_INVALID_FRAME = -506,
SPDYLAY_ERR_EOF = -507,
SPDYLAY_ERR_DEFERRED = -508,
/* The errors < SPDYLAY_ERR_FATAL mean that the library is under
unexpected condition that it cannot process any further data
reliably (e.g., out of memory). */
SPDYLAY_ERR_FATAL = -900,
SPDYLAY_ERR_NOMEM = -901,
SPDYLAY_ERR_CALLBACK_FAILURE = -902,
} spdylay_error;
typedef enum {
SPDYLAY_MSG_MORE
} spdylay_io_flag;
typedef enum {
SPDYLAY_SYN_STREAM = 1,
SPDYLAY_SYN_REPLY = 2,
SPDYLAY_RST_STREAM = 3,
SPDYLAY_SETTINGS = 4,
SPDYLAY_NOOP = 5,
SPDYLAY_PING = 6,
SPDYLAY_GOAWAY = 7,
SPDYLAY_HEADERS = 8,
SPDYLAY_DATA = 100,
} spdylay_frame_type;
typedef enum {
SPDYLAY_FLAG_NONE = 0,
SPDYLAY_FLAG_FIN = 1,
SPDYLAY_FLAG_UNIDIRECTIONAL = 2
} spdylay_flag;
typedef enum {
SPDYLAY_FLAG_SETTINGS_NONE = 0,
SPDYLAY_FLAG_SETTINGS_CLEAR_PREVIOUSLY_PERSISTED_SETTINGS = 1
} spdylay_settings_flag;
typedef enum {
SPDYLAY_ID_FLAG_SETTINGS_NONE = 0,
SPDYLAY_ID_FLAG_SETTINGS_PERSIST_VALUE = 1,
SPDYLAY_ID_FLAG_SETTINGS_PERSISTED = 2
} spdylay_settings_id_flag;
typedef enum {
SPDYLAY_SETTINGS_UPLOAD_BANDWIDTH = 1,
SPDYLAY_SETTINGS_DOWNLOAD_BANDWIDTH = 2,
SPDYLAY_SETTINGS_ROUND_TRIP_TIME = 3,
SPDYLAY_SETTINGS_MAX_CONCURRENT_STREAMS = 4,
SPDYLAY_SETTINGS_CURRENT_CWND = 5,
SPDYLAY_SETTINGS_DOWNLOAD_RETRANS_RATE = 6,
SPDYLAY_SETTINGS_INITIAL_WINDOW_SIZE = 7
} spdylay_settings_id;
/* Maximum ID of spdylay_settings_id. */
#define SPDYLAY_SETTINGS_MAX 7
/* Default maximum concurrent streams */
#define SPDYLAY_CONCURRENT_STREAMS_MAX 100
typedef enum {
SPDYLAY_OK = 0,
SPDYLAY_PROTOCOL_ERROR = 1,
SPDYLAY_INVALID_STREAM = 2,
SPDYLAY_REFUSED_STREAM = 3,
SPDYLAY_UNSUPPORTED_VERSION = 4,
SPDYLAY_CANCEL = 5,
SPDYLAY_INTERNAL_ERROR = 6,
SPDYLAY_FLOW_CONTROL_ERROR = 7
} spdylay_status_code;
typedef struct {
uint16_t version;
uint16_t type;
uint8_t flags;
int32_t length;
} spdylay_ctrl_hd;
typedef struct {
spdylay_ctrl_hd hd;
int32_t stream_id;
int32_t assoc_stream_id;
/* 0 (Highest) to 3 (Lowest). Looks like spdy/2 spec is wrong. */
uint8_t pri;
char **nv;
} spdylay_syn_stream;
typedef struct {
spdylay_ctrl_hd hd;
int32_t stream_id;
char **nv;
} spdylay_syn_reply;
typedef struct {
spdylay_ctrl_hd hd;
int32_t stream_id;
char **nv;
} spdylay_headers;
typedef struct {
spdylay_ctrl_hd hd;
int32_t stream_id;
uint32_t status_code;
} spdylay_rst_stream;
typedef struct {
int32_t settings_id;
uint8_t flags;
uint32_t value;
} spdylay_settings_entry;
typedef struct {
spdylay_ctrl_hd hd;
/* Number of entries in |iv| */
size_t niv;
spdylay_settings_entry *iv;
} spdylay_settings;
typedef struct {
spdylay_ctrl_hd hd;
uint32_t unique_id;
} spdylay_ping;
typedef struct {
spdylay_ctrl_hd hd;
int32_t last_good_stream_id;
uint32_t status_code;
} spdylay_goaway;
typedef union {
int fd;
void *ptr;
} spdylay_data_source;
/*
* Callback function invoked when the library wants to read data from
* |source|. The read data is sent in the stream |stream_id|. The
* implementation of this function must read at most |length| bytes of
* data from |source| (or possibly other places) and store them in
* |buf| and return number of data stored in |buf|. If EOF is reached,
* set |*eof| to 1. If the application wants to postpone DATA frames,
* (e.g., asynchronous I/O, or reading data blocks for long time), it
* is achieved by returning SPDYLAY_ERR_DEFERRED without reading any
* data in this invocation. The library removes DATA frame from
* outgoing queue temporarily. To move back deferred DATA frame to
* outgoing queue, call spdylay_session_resume_data(). In case of
* error, return SPDYLAY_ERR_CALLBACK_FAILURE, which leads to session
* failure.
*/
typedef ssize_t (*spdylay_data_source_read_callback)
(spdylay_session *session, int32_t stream_id,
uint8_t *buf, size_t length, int *eof,
spdylay_data_source *source, void *user_data);
typedef struct {
spdylay_data_source source;
spdylay_data_source_read_callback read_callback;
} spdylay_data_provider;
typedef struct {
int32_t stream_id;
uint8_t flags;
/* Initially eof is 0. It becomes 1 if all data are read. */
uint8_t eof;
spdylay_data_provider data_prd;
} spdylay_data;
typedef union {
spdylay_syn_stream syn_stream;
spdylay_syn_reply syn_reply;
spdylay_rst_stream rst_stream;
spdylay_settings settings;
spdylay_ping ping;
spdylay_goaway goaway;
spdylay_headers headers;
spdylay_data data;
} spdylay_frame;
/*
* Callback function invoked when |session| want to send data to
* remote peer. The implementation of this function must send at most
* |length| bytes of data stored in |data|. It must return the number
* of bytes sent if it succeeds. If it cannot send any single byte
* without blocking, it must return SPDYLAY_ERR_WOULDBLOCK. For other
* errors, it must return SPDYLAY_ERR_CALLBACK_FAILURE.
*/
typedef ssize_t (*spdylay_send_callback)
(spdylay_session *session,
const uint8_t *data, size_t length, int flags, void *user_data);
/*
* Callback function invoked when |session| want to receive data from
* remote peer. The implementation of this function must read at most
* |length| bytes of data and store it in |buf|. It must return the
* number of bytes written in |buf| if it succeeds. If it cannot read
* any single byte without blocking, it must return
* SPDYLAY_ERR_WOULDBLOCK. If it gets EOF before it reads any single
* byte, it must return SPDYLAY_ERR_EOF. For other errors, it must
* return SPDYLAY_ERR_CALLBACK_FAILURE.
*/
typedef ssize_t (*spdylay_recv_callback)
(spdylay_session *session,
uint8_t *buf, size_t length, int flags, void *user_data);
/*
* Callback function invoked by spdylay_session_recv() when a control
* frame is arrived.
*/
typedef void (*spdylay_on_ctrl_recv_callback)
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data);
/*
* Callback function invoked by spdylay_session_recv() when an invalid
* control frame is arrived, which typically the case where RST_STREAM
* will be sent
*/
typedef void (*spdylay_on_invalid_ctrl_recv_callback)
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data);
/*
* Callback function invoked when data chunk of DATA frame is
* received. |stream_id| is the stream ID of this DATA frame belongs
* to. |flags| is the flags of DATA frame which this data chunk is
* contained. flags & SPDYLAY_FLAG_FIN does not necessarily mean this
* chunk of data is the last one in the stream. You should use
* spdylay_on_data_recv_callback to know all data frame is received
* whose flags contains SPDYLAY_FLAG_FIN.
*/
typedef void (*spdylay_on_data_chunk_recv_callback)
(spdylay_session *session, uint8_t flags, int32_t stream_id,
const uint8_t *data, size_t len, void *user_data);
/*
* Callback function invoked when DATA frame is received. The actual
* data it contains are received by spdylay_on_data_recv_callback.
*/
typedef void (*spdylay_on_data_recv_callback)
(spdylay_session *session, uint8_t flags, int32_t stream_id, int32_t length,
void *user_data);
/*
* Callback function invoked after frame |frame| of type |type| is
* sent.
*/
typedef void (*spdylay_on_ctrl_send_callback)
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data);
/*
* Callback function invoked after DATA frame is sent.
*/
typedef void (*spdylay_on_data_send_callback)
(spdylay_session *session, uint8_t flags, int32_t stream_id, int32_t length,
void *user_data);
/*
* Callback function invoked before frame |frame| of type |type| is
* sent. This may be useful, for example, to know the stream ID of
* SYN_STREAM frame (see also spdylay_session_get_stream_user_data),
* which is not assigned when it was queued.
*/
typedef void (*spdylay_before_ctrl_send_callback)
(spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
void *user_data);
/*
* Callback function invoked when stream |stream_id| is closed. The
* reason of closure is indicated by |status_code|. stream_user_data
* is still available in this function.
*/
typedef void (*spdylay_on_stream_close_callback)
(spdylay_session *session, int32_t stream_id, spdylay_status_code status_code,
void *user_data);
/*
* Callback function invoked when request from remote peer is
* received. In other words, frame with FIN flag set is received. In
* HTTP, this means HTTP request, including request body, is fully
* received.
*/
typedef void (*spdylay_on_request_recv_callback)
(spdylay_session *session, int32_t stream_id, void *user_data);
typedef struct {
spdylay_send_callback send_callback;
spdylay_recv_callback recv_callback;
spdylay_on_ctrl_recv_callback on_ctrl_recv_callback;
spdylay_on_invalid_ctrl_recv_callback on_invalid_ctrl_recv_callback;
spdylay_on_data_chunk_recv_callback on_data_chunk_recv_callback;
spdylay_on_data_recv_callback on_data_recv_callback;
spdylay_before_ctrl_send_callback before_ctrl_send_callback;
spdylay_on_ctrl_send_callback on_ctrl_send_callback;
spdylay_on_data_send_callback on_data_send_callback;
spdylay_on_stream_close_callback on_stream_close_callback;
spdylay_on_request_recv_callback on_request_recv_callback;
} spdylay_session_callbacks;
/*
* Initializes |*session_ptr| for client use. This function returns 0
* if it succeeds, or negative error code.
*/
int spdylay_session_client_new(spdylay_session **session_ptr,
const spdylay_session_callbacks *callbacks,
void *user_data);
/*
* Initializes |*session_ptr| for server use. This function returns 0
* if it succeeds, or negative error code.
*/
int spdylay_session_server_new(spdylay_session **session_ptr,
const spdylay_session_callbacks *callbacks,
void *user_data);
/*
* Frees any resources allocated for |session|.
*/
void spdylay_session_del(spdylay_session *session);
/*
* Sends pending frames to the remote peer. This function returns 0 if
* it succeeds, or negative error code.
*/
int spdylay_session_send(spdylay_session *session);
/*
* Receives frames from the remote peer. This function returns 0 if it
* succeeds, or negative error code.
*/
int spdylay_session_recv(spdylay_session *session);
/*
* Returns non-zero value if |session| want to receive data from the
* remote peer, or 0.
*
* if both spdylay_session_want_read() and
* spdylay_session_want_write() return 0, the application should drop
* the connection.
*/
int spdylay_session_want_read(spdylay_session *session);
/*
* Returns non-zero value if |session| want to send data to the remote
* peer, or 0.
*
* if both spdylay_session_want_read() and
* spdylay_session_want_write() return 0, the application should drop
* the connection.
*/
int spdylay_session_want_write(spdylay_session *session);
/*
* Returns stream_user_data for the stream |stream_id|. The
* stream_user_data is provided by spdylay_submit_request(). If the
* stream is initiated by the remote endpoint, stream_user_data is
* always NULL. If the stream is initiated by the local endpoint and
* NULL is given in spdylay_submit_request(), then this function
* returns NULL. If the stream does not exist, this function returns
* NULL.
*/
void* spdylay_session_get_stream_user_data(spdylay_session *session,
int32_t stream_id);
/*
* Submits SYN_STREAM frame and optionally one or more DATA
* frames. |pri| is priority of this request and it must be in the
* range of [0, 3]. 0 means the higest priority. |nv| must include
* following name/value pairs:
*
* "method": HTTP method (e.g., "GET", "POST", "HEAD", etc)
* "scheme": URI scheme (e.g., "https")
* "url": Absolute path and parameters of this request (e.g., "/foo",
* "/foo;bar;haz?h=j&y=123")
* "version": HTTP version (e.g., "HTTP/1.1")
*
* "host" name/value pair is also required by some hosts.
*
* This function creates copies of all name/value pairs in |nv|. It
* also lower-cases all names in |nv|.
*
* If |data_prd| is not NULL, it provides data which will be sent in
* subsequent DATA frames. In this case, a method that allows request
* message bodies
* (http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9) must
* be specified with "method" key in |nv| (e.g. POST). If |data_prd|
* is NULL, SYN_STREAM have FLAG_FIN. |stream_user_data| can be an
* arbitrary pointer, which can be retrieved by
* spdylay_session_get_stream_user_data(). Since stream ID is not
* known before sending SYN_STREAM frame and the application code has
* to compare url, and possibly other header field values, to identify
* stream ID for the request in spdylay_on_ctrl_send_callback(). With
* |stream_user_data|, the application can easily identifies stream ID
* for the request.
*
* This function returns 0 if it succeeds, or negative error code.
*/
int spdylay_submit_request(spdylay_session *session, uint8_t pri,
const char **nv,
spdylay_data_provider *data_prd,
void *stream_user_data);
/*
* Submits SYN_REPLY frame and optionally one or more DATA frames
* against stream |stream_id|. |nv| must include following name/value
* pairs:
*
* "status": HTTP status code (e.g., "200" or "200 OK")
* "version": HTTP response version (e.g., "HTTP/1.1")
*
* This function creates copies of all name/value pairs in |nv|. It
* also lower-cases all names in |nv|.
*
* If |data_prd| is not NULL, it provides data which will be sent in
* subsequent DATA frames. If |data_prd| is NULL, SYN_REPLY will have
* FLAG_FIN.
*
* This function returns 0 if it succeeds, or negative error code.
*/
int spdylay_submit_response(spdylay_session *session,
int32_t stream_id, const char **nv,
spdylay_data_provider *data_prd);
/*
* Submits 1 or more DATA frames to the stream |stream_id|. The data
* to be sent are provided by |data_prd|. Depending on the length of
* data, 1 or more DATA frames will be sent. If |flags| contains
* SPDYLAY_FLAG_FIN, the last DATA frame has FLAG_FIN set.
*
* This function returns 0 if it succeeds, or negative error code.
*/
int spdylay_submit_data(spdylay_session *session, int32_t stream_id,
uint8_t flags, spdylay_data_provider *data_prd);
/*
* Submits RST_STREAM frame to cancel/reject stream |stream_id| with
* status code |status_code|. This function returns 0 if it succeeds,
* or negative error code.
*/
int spdylay_submit_rst_stream(spdylay_session *session, int32_t stream_id,
uint32_t status_code);
/*
* Submits PING frame. This function returns 0 if it succeeds, or
* negative error code.
*/
int spdylay_submit_ping(spdylay_session *session);
/*
* Submits GOAWAY frame. This function returns 0 if it succeeds, or
* negative error code.
*/
int spdylay_submit_goaway(spdylay_session *session);
/*
* A helper function for dealing with NPN in client side.
* |in| contains server's protocol in preferable order.
* The format of |in| is length-prefixed and not null-terminated.
* For example, "spdy/2" are "http/1.1" stored in |in| like this:
*
* in[0] = 6
* in[1..6] = "spdy/2"
* in[7] = 8
* in[8..15] = "http/1.1"
* inlen = 16
*
* The selection algorithm is as follows:
*
* 1. If server's list contains "spdy/2", this function selects
* "spdy/2" and returns 1. The following steps are not taken.
*
* 2. If server's list contains "http/1.1", this function selects
* "http/1.1" and returns 0. The following step is not taken.
*
* 3. This function selects nothing and returns -1. (So called
* non-overlap case). In this case, |out| and |outlen| are left
* untouched.
*
* When spdylay supports updated version of SPDY in the future, this
* function may select updated protocol and application code which
* relies on spdylay for SPDY stuff needs not be modified.
*
* Selecting "spdy/2" means that "spdy/2" is written into |*out| and
* length of "spdy/2" (which is 6) is assigned to |*outlen|.
*
* See http://technotes.googlecode.com/git/nextprotoneg.html for more
* details about NPN.
*
* To use this method you should do something like:
*
* static int select_next_proto_cb(SSL* ssl,
* unsigned char **out, unsigned char *outlen,
* const unsigned char *in, unsigned int inlen,
* void *arg)
* {
* if (spdylay_select_next_protocol(out, outlen, in, inlen) == 1) {
* ((MyType*)arg)->spdy = 1;
* }
* return SSL_TLSEXT_ERR_OK;
* }
* ...
* SSL_CTX_set_next_proto_select_cb(ssl_ctx, select_next_proto_cb, my_obj);
*/
int spdylay_select_next_protocol(unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen);
/*
* Put back previously deferred DATA frame in the stream |stream_id|
* to outbound queue. This function returns 0 if it succeeds, or
* negative error code.
*/
int spdylay_session_resume_data(spdylay_session *session, int32_t stream_id);
#ifdef __cplusplus
}
#endif
#endif /* SPDYLAY_H */
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