276 lines
9.3 KiB
C
276 lines
9.3 KiB
C
/*
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* Spdylay - SPDY 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 SPDYLAY_SESSION_H
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#define SPDYLAY_SESSION_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 <spdylay/spdylay.h>
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#include "spdylay_pq.h"
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#include "spdylay_map.h"
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#include "spdylay_frame.h"
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#include "spdylay_zlib.h"
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#include "spdylay_stream.h"
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typedef struct {
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spdylay_frame_type frame_type;
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spdylay_frame *frame;
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void *aux_data;
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int pri;
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int64_t seq;
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} spdylay_outbound_item;
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typedef struct {
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spdylay_outbound_item *item;
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uint8_t *framebuf;
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size_t framebuflen;
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size_t framebufoff;
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} spdylay_active_outbound_item;
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typedef struct {
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uint8_t buf[4096];
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uint8_t *mark;
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uint8_t *limit;
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} spdylay_inbound_buffer;
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typedef enum {
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SPDYLAY_RECV_HEAD,
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SPDYLAY_RECV_PAYLOAD
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} spdylay_inbound_state;
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#define SPDYLAY_HEAD_LEN 8
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/* Maximum unique ID in use for PING. If unique ID exeeds this number,
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it wraps to 1 (client) or 2 (server) */
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#define SPDYLAY_MAX_UNIQUE_ID ((1u << 31)-1)
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typedef struct {
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spdylay_inbound_state state;
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uint8_t headbuf[SPDYLAY_HEAD_LEN];
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/* NULL if inbound frame is data frame */
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uint8_t *buf;
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/* length in Length field */
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size_t len;
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size_t off;
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uint8_t ign;
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} spdylay_inbound_frame;
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typedef enum {
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SPDYLAY_GOAWAY_NONE = 0,
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/* Flag means GOAWAY frame is sent to the remote peer. */
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SPDYLAY_GOAWAY_SEND = 0x1,
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/* Flag means GOAWAY frame is received from the remote peer. */
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SPDYLAY_GOAWAY_RECV = 0x2
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} spdylay_goaway_flag;
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struct spdylay_session {
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uint8_t server;
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int32_t next_stream_id;
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int32_t last_recv_stream_id;
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/* Counter of unique ID of PING. Wraps when it exceeds
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SPDYLAY_MAX_UNIQUE_ID */
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uint32_t next_unique_id;
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/* Sequence number of outbound frame to maintain the order of
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enqueue if priority is equal. */
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int64_t next_seq;
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spdylay_map /* <spdylay_stream*> */ streams;
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spdylay_pq /* <spdylay_outbound_item*> */ ob_pq;
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spdylay_active_outbound_item aob;
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spdylay_inbound_buffer ibuf;
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spdylay_inbound_frame iframe;
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spdylay_zlib hd_deflater;
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spdylay_zlib hd_inflater;
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/* The last unique ID sent to the peer. */
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uint32_t last_ping_unique_id;
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/* Flags indicating GOAWAY is sent and/or recieved. The flags are
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composed by bitwise OR-ing spdylay_goaway_flag. */
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uint8_t goaway_flags;
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/* This is the value in GOAWAY frame sent by remote endpoint. */
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int32_t last_good_stream_id;
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spdylay_session_callbacks callbacks;
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void *user_data;
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};
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/* TODO stream timeout etc */
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/*
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* Adds frame |frame| of type |frame_type| to tx queue in |session|.
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* |aux_data| is a pointer to arbitrary data. Its interpretation is
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* defined per |frame_type|. When this function succeeds, it takes
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* ownership of |frame| and |aux_data|, so caller must not free them.
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* This function returns 0 if it succeeds, or negative error code.
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*/
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int spdylay_session_add_frame(spdylay_session *session,
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spdylay_frame_type frame_type,
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spdylay_frame *frame,
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void *aux_data);
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int spdylay_session_add_rst_stream(spdylay_session *session,
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int32_t stream_id, uint32_t status_code);
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int spdylay_session_add_ping(spdylay_session *session, uint32_t unique_id);
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int spdylay_session_add_goaway(spdylay_session *session,
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int32_t last_good_stream_id);
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/*
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* Creates new stream in |session| with stream ID |stream_id|,
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* priority |pri| and flags |flags|. Currently, |flags| &
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* SPDYLAY_FLAG_UNIDIRECTIONAL is non-zero, this stream is
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* unidirectional. |flags| & SPDYLAY_FLAG_FIN is non-zero, the sender
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* of SYN_STREAM will not send any further data in this stream. The
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* state of stream is set to |initial_state|. This function returns a
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* pointer to created new stream object, or NULL.
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*/
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spdylay_stream* spdylay_session_open_stream(spdylay_session *session,
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int32_t stream_id,
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uint8_t flags, uint8_t pri,
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spdylay_stream_state initial_state);
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/*
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* Closes stream whose stream ID is |stream_id|. The reason of closure
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* is indicated by |status_code|. This function returns 0 if it
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* succeeds, or negative error code. The possible error code is
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* SPDYLAY_ERR_INVALID_ARGUMENT, which is used when stream |stream_id|
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* does not exist. So the caller may ignore this error.
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*/
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int spdylay_session_close_stream(spdylay_session *session, int32_t stream_id,
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spdylay_status_code status_code);
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/*
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* If further receptions and transmissions over this stream are
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* disallowed, close this stream. This function returns 0 if it
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* succeeds, or negative error code. If either receptions or
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* transmissions is allowed, this function returns 0 and the stream
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* will not be closed.
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*/
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int spdylay_session_close_stream_if_shut_rdwr(spdylay_session *session,
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spdylay_stream *stream);
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/*
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* Called when SYN_STREAM is received. Received frame is |frame|.
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* This function does first validate received frame and then open
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* stream and call callback functions. This function returns 0 if it
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* succeeds, or negative error code. This function does not return
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* error if frame is not valid.
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*/
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int spdylay_session_on_syn_stream_received(spdylay_session *session,
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spdylay_frame *frame);
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/*
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* Called when SYN_REPLY is received. Received frame is |frame|.
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*/
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int spdylay_session_on_syn_reply_received(spdylay_session *session,
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spdylay_frame *frame);
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/*
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* Called when RST_STREAM is received. Received frame is |frame|.
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*/
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int spdylay_session_on_rst_stream_received(spdylay_session *session,
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spdylay_frame *frame);
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/*
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* Called when SETTINGS is received. Received frame is |frame|.
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*/
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int spdylay_session_on_settings_received(spdylay_session *session,
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spdylay_frame *frame);
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/*
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* Called when PING is received. Received frame is |frame|.
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*/
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int spdylay_session_on_ping_received(spdylay_session *session,
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spdylay_frame *frame);
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/*
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* Called when GOAWAY is received. Received frame is |frame|.
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*/
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int spdylay_session_on_goaway_received(spdylay_session *session,
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spdylay_frame *frame);
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/*
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* Called when HEADERS is recieved. Received frame is |frame|.
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*/
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int spdylay_session_on_headers_received(spdylay_session *session,
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spdylay_frame *frame);
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/*
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* Called when DATA is received.
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*/
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int spdylay_session_on_data_received(spdylay_session *session,
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uint8_t flags, int32_t length,
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int32_t stream_id);
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/*
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* Returns spdylay_stream* object whose stream ID is |stream_id|. It
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* could be NULL if such stream does not exist.
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*/
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spdylay_stream* spdylay_session_get_stream(spdylay_session *session,
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int32_t stream_id);
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/*
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* Packs DATA frame |frame| in wire frame format and store it in
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* |*buf_ptr|. This function always allocates
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* 8+SPDYLAY_DATA_CHUNK_LENGTH bytes. It packs header in first 8
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* bytes. Remaining bytes are filled using frame->data_prd. This
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* function returns the size of packed frame if it succeeds, or
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* negative error code.
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*/
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ssize_t spdylay_session_pack_data(spdylay_session *session,
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uint8_t **buf_ptr, spdylay_data *frame);
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/*
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* Packs DATA frame |frame| in wire frame format and store it in
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* |buf|. |len| must be greater than or equal to 8. This function
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* returns the sizeof packed frame if it succeeds, or negative error
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* code.
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*/
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ssize_t spdylay_session_pack_data_overwrite(spdylay_session *session,
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uint8_t *buf, size_t len,
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spdylay_data *frame);
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/*
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* Returns next unique ID which can be used with PING.
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*/
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uint32_t spdylay_session_get_next_unique_id(spdylay_session *session);
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/*
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* Returns top of outbound frame queue. This function returns NULL if
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* queue is empty.
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*/
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spdylay_outbound_item* spdylay_session_get_ob_pq_top(spdylay_session *session);
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#endif /* SPDYLAY_SESSION_H */
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