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/*
This file is part of libmicrospdy
Copyright (C) 2012 Andrey Uzunov
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file stream.c
* @brief SPDY streams handling
* @author Andrey Uzunov
*/
#include "platform.h"
#include "structures.h"
#include "internal.h"
#include "session.h"
int
SPDYF_stream_new (struct SPDY_Session *session)
{
uint32_t stream_id;
uint32_t assoc_stream_id;
uint8_t priority;
uint8_t slot;
size_t buffer_pos = session->read_buffer_beginning;
struct SPDYF_Stream *stream;
struct SPDYF_Control_Frame *frame;
if((session->read_buffer_offset - session->read_buffer_beginning) < 10)
{
//not all fields are received to create new stream
return SPDY_NO;
}
frame = (struct SPDYF_Control_Frame *)session->frame_handler_cls;
//get stream id of the new stream
memcpy(&stream_id, session->read_buffer + session->read_buffer_beginning, 4);
stream_id = NTOH31(stream_id);
session->read_buffer_beginning += 4;
if(stream_id <= session->last_in_stream_id || 0==(stream_id % 2))
{
//wrong stream id sent by client
//GOAWAY with PROTOCOL_ERROR MUST be sent
//TODO
//ignore frame
session->frame_handler = &SPDYF_handler_ignore_frame;
return SPDY_NO;
}
else if(session->is_goaway_sent)
{
//the client is not allowed to create new streams anymore
//we MUST ignore the frame
session->frame_handler = &SPDYF_handler_ignore_frame;
return SPDY_NO;
}
//set highest stream id for session
session->last_in_stream_id = stream_id;
//get assoc stream id of the new stream
//this value is used with SPDY PUSH, thus nothing to do with it here
memcpy(&assoc_stream_id, session->read_buffer + session->read_buffer_beginning, 4);
assoc_stream_id = NTOH31(assoc_stream_id);
session->read_buffer_beginning += 4;
//get stream priority (3 bits)
//after it there are 5 bits that are not used
priority = *(uint8_t *)(session->read_buffer + session->read_buffer_beginning) >> 5;
session->read_buffer_beginning++;
//get slot (see SPDY draft)
slot = *(uint8_t *)(session->read_buffer + session->read_buffer_beginning);
session->read_buffer_beginning++;
if(NULL == (stream = malloc(sizeof(struct SPDYF_Stream))))
{
SPDYF_DEBUG("No memory");
//revert buffer state
session->read_buffer_beginning = buffer_pos;
return SPDY_NO;
}
memset(stream,0, sizeof(struct SPDYF_Stream));
stream->session = session;
stream->stream_id = stream_id;
stream->assoc_stream_id = assoc_stream_id;
stream->priority = priority;
stream->slot = slot;
stream->is_in_closed = (frame->flags & SPDY_SYN_STREAM_FLAG_FIN) != 0;
stream->flag_unidirectional = (frame->flags & SPDY_SYN_STREAM_FLAG_UNIDIRECTIONAL) != 0;
stream->is_out_closed = stream->flag_unidirectional;
stream->is_server_initiator = false;
stream->window_size = SPDYF_INITIAL_WINDOW_SIZE;
//put the stream to the list of streams for the session
DLL_insert(session->streams_head, session->streams_tail, stream);
return SPDY_YES;
}
void
SPDYF_stream_destroy(struct SPDYF_Stream *stream)
{
SPDY_name_value_destroy(stream->headers);
free(stream);
stream = NULL;
}
void
SPDYF_stream_set_flags_on_write(struct SPDYF_Response_Queue *response_queue)
{
struct SPDYF_Stream * stream = response_queue->stream;
if(NULL != response_queue->data_frame)
{
stream->is_out_closed = (bool)(response_queue->data_frame->flags & SPDY_DATA_FLAG_FIN);
}
else if(NULL != response_queue->control_frame)
{
switch(response_queue->control_frame->type)
{
case SPDY_CONTROL_FRAME_TYPES_SYN_REPLY:
stream->is_out_closed = (bool)(response_queue->control_frame->flags & SPDY_SYN_REPLY_FLAG_FIN);
break;
case SPDY_CONTROL_FRAME_TYPES_RST_STREAM:
if(NULL != stream)
{
stream->is_out_closed = true;
stream->is_in_closed = true;
}
break;
}
}
}
//TODO add function *on_read
struct SPDYF_Stream *
SPDYF_stream_find(uint32_t stream_id, struct SPDY_Session * session)
{
struct SPDYF_Stream * stream = session->streams_head;
while(NULL != stream && stream_id != stream->stream_id)
{
stream = stream->next;
}
return stream;
}
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