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curl/lib/rtsp.c
Daniel Stenberg e79535bc5e SessionHandle: the protocol specific pointer is now a void * 
All protocol handler structs are now opaque (void *) in the
SessionHandle struct and moved in the request-specific sub-struct
'SingleRequest'. The intension is to keep the protocol specific
knowledge in their own dedicated source files [protocol].c etc.

There's some "leakage" where this policy is violated, to be addressed at
a later point in time.
2013-08-12 13:17:57 +02:00

810 lines
24 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#ifndef CURL_DISABLE_RTSP
#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "multiif.h"
#include "http.h"
#include "url.h"
#include "progress.h"
#include "rtsp.h"
#include "rawstr.h"
#include "curl_memory.h"
#include "select.h"
#include "connect.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
/*
* TODO (general)
* -incoming server requests
* -server CSeq counter
* -digest authentication
* -connect thru proxy
* -pipelining?
*/
#define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1])))
#define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) | \
((int)((unsigned char)((p)[3]))))
/* protocol-specific functions set up to be called by the main engine */
static CURLcode rtsp_do(struct connectdata *conn, bool *done);
static CURLcode rtsp_done(struct connectdata *conn, CURLcode, bool premature);
static CURLcode rtsp_connect(struct connectdata *conn, bool *done);
static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead);
static int rtsp_getsock_do(struct connectdata *conn,
curl_socket_t *socks,
int numsocks);
/*
* Parse and write out any available RTP data.
*
* nread: amount of data left after k->str. will be modified if RTP
* data is parsed and k->str is moved up
* readmore: whether or not the RTP parser needs more data right away
*/
static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data,
struct connectdata *conn,
ssize_t *nread,
bool *readmore);
static CURLcode rtsp_setup_connection(struct connectdata *conn);
/* this returns the socket to wait for in the DO and DOING state for the multi
interface and then we're always _sending_ a request and thus we wait for
the single socket to become writable only */
static int rtsp_getsock_do(struct connectdata *conn,
curl_socket_t *socks,
int numsocks)
{
/* write mode */
(void)numsocks; /* unused, we trust it to be at least 1 */
socks[0] = conn->sock[FIRSTSOCKET];
return GETSOCK_WRITESOCK(0);
}
static
CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len);
/*
* RTSP handler interface.
*/
const struct Curl_handler Curl_handler_rtsp = {
"RTSP", /* scheme */
rtsp_setup_connection, /* setup_connection */
rtsp_do, /* do_it */
rtsp_done, /* done */
ZERO_NULL, /* do_more */
rtsp_connect, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
rtsp_getsock_do, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
rtsp_disconnect, /* disconnect */
rtsp_rtp_readwrite, /* readwrite */
PORT_RTSP, /* defport */
CURLPROTO_RTSP, /* protocol */
PROTOPT_NONE /* flags */
};
static CURLcode rtsp_setup_connection(struct connectdata *conn)
{
struct RTSP *rtsp;
conn->data->req.protop = rtsp = calloc(1, sizeof(struct RTSP));
if(!rtsp)
return CURLE_OUT_OF_MEMORY;
return CURLE_OK;
}
/*
* The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not
* want to block the application forever while receiving a stream. Therefore,
* we cannot assume that an RTSP socket is dead just because it is readable.
*
* Instead, if it is readable, run Curl_getconnectinfo() to peek at the socket
* and distinguish between closed and data.
*/
bool Curl_rtsp_connisdead(struct connectdata *check)
{
int sval;
bool ret_val = TRUE;
sval = Curl_socket_ready(check->sock[FIRSTSOCKET], CURL_SOCKET_BAD, 0);
if(sval == 0) {
/* timeout */
ret_val = FALSE;
}
else if(sval & CURL_CSELECT_ERR) {
/* socket is in an error state */
ret_val = TRUE;
}
else if((sval & CURL_CSELECT_IN) && check->data) {
/* readable with no error. could be closed or could be alive but we can
only check if we have a proper SessionHandle for the connection */
curl_socket_t connectinfo = Curl_getconnectinfo(check->data, &check);
if(connectinfo != CURL_SOCKET_BAD)
ret_val = FALSE;
}
return ret_val;
}
static CURLcode rtsp_connect(struct connectdata *conn, bool *done)
{
CURLcode httpStatus;
struct SessionHandle *data = conn->data;
httpStatus = Curl_http_connect(conn, done);
/* Initialize the CSeq if not already done */
if(data->state.rtsp_next_client_CSeq == 0)
data->state.rtsp_next_client_CSeq = 1;
if(data->state.rtsp_next_server_CSeq == 0)
data->state.rtsp_next_server_CSeq = 1;
conn->proto.rtspc.rtp_channel = -1;
return httpStatus;
}
static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead)
{
(void) dead;
Curl_safefree(conn->proto.rtspc.rtp_buf);
return CURLE_OK;
}
static CURLcode rtsp_done(struct connectdata *conn,
CURLcode status, bool premature)
{
struct SessionHandle *data = conn->data;
struct RTSP *rtsp = data->req.protop;
CURLcode httpStatus;
long CSeq_sent;
long CSeq_recv;
/* Bypass HTTP empty-reply checks on receive */
if(data->set.rtspreq == RTSPREQ_RECEIVE)
premature = TRUE;
httpStatus = Curl_http_done(conn, status, premature);
if(rtsp) {
/* Check the sequence numbers */
CSeq_sent = rtsp->CSeq_sent;
CSeq_recv = rtsp->CSeq_recv;
if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
failf(data,
"The CSeq of this request %ld did not match the response %ld",
CSeq_sent, CSeq_recv);
return CURLE_RTSP_CSEQ_ERROR;
}
else if(data->set.rtspreq == RTSPREQ_RECEIVE &&
(conn->proto.rtspc.rtp_channel == -1)) {
infof(data, "Got an RTP Receive with a CSeq of %ld\n", CSeq_recv);
/* TODO CPC: Server -> Client logic here */
}
}
return httpStatus;
}
static CURLcode rtsp_do(struct connectdata *conn, bool *done)
{
struct SessionHandle *data = conn->data;
CURLcode result=CURLE_OK;
Curl_RtspReq rtspreq = data->set.rtspreq;
struct RTSP *rtsp = data->req.protop;
struct HTTP *http;
Curl_send_buffer *req_buffer;
curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
const char *p_request = NULL;
const char *p_session_id = NULL;
const char *p_accept = NULL;
const char *p_accept_encoding = NULL;
const char *p_range = NULL;
const char *p_referrer = NULL;
const char *p_stream_uri = NULL;
const char *p_transport = NULL;
const char *p_uagent = NULL;
*done = TRUE;
http = &(rtsp->http_wrapper);
/* Assert that no one has changed the RTSP struct in an evil way */
DEBUGASSERT((void *)http == (void *)rtsp);
rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
rtsp->CSeq_recv = 0;
/* Setup the 'p_request' pointer to the proper p_request string
* Since all RTSP requests are included here, there is no need to
* support custom requests like HTTP.
**/
DEBUGASSERT((rtspreq > RTSPREQ_NONE && rtspreq < RTSPREQ_LAST));
data->set.opt_no_body = TRUE; /* most requests don't contain a body */
switch(rtspreq) {
case RTSPREQ_NONE:
failf(data, "Got invalid RTSP request: RTSPREQ_NONE");
return CURLE_BAD_FUNCTION_ARGUMENT;
case RTSPREQ_OPTIONS:
p_request = "OPTIONS";
break;
case RTSPREQ_DESCRIBE:
p_request = "DESCRIBE";
data->set.opt_no_body = FALSE;
break;
case RTSPREQ_ANNOUNCE:
p_request = "ANNOUNCE";
break;
case RTSPREQ_SETUP:
p_request = "SETUP";
break;
case RTSPREQ_PLAY:
p_request = "PLAY";
break;
case RTSPREQ_PAUSE:
p_request = "PAUSE";
break;
case RTSPREQ_TEARDOWN:
p_request = "TEARDOWN";
break;
case RTSPREQ_GET_PARAMETER:
/* GET_PARAMETER's no_body status is determined later */
p_request = "GET_PARAMETER";
data->set.opt_no_body = FALSE;
break;
case RTSPREQ_SET_PARAMETER:
p_request = "SET_PARAMETER";
break;
case RTSPREQ_RECORD:
p_request = "RECORD";
break;
case RTSPREQ_RECEIVE:
p_request = "";
/* Treat interleaved RTP as body*/
data->set.opt_no_body = FALSE;
break;
case RTSPREQ_LAST:
failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
return CURLE_BAD_FUNCTION_ARGUMENT;
}
if(rtspreq == RTSPREQ_RECEIVE) {
Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
&http->readbytecount, -1, NULL);
return result;
}
p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
if(!p_session_id &&
(rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) {
failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
p_request ? p_request : "");
return CURLE_BAD_FUNCTION_ARGUMENT;
}
/* TODO: auth? */
/* TODO: proxy? */
/* Stream URI. Default to server '*' if not specified */
if(data->set.str[STRING_RTSP_STREAM_URI]) {
p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
}
else {
p_stream_uri = "*";
}
/* Transport Header for SETUP requests */
p_transport = Curl_checkheaders(data, "Transport:");
if(rtspreq == RTSPREQ_SETUP && !p_transport) {
/* New Transport: setting? */
if(data->set.str[STRING_RTSP_TRANSPORT]) {
Curl_safefree(conn->allocptr.rtsp_transport);
conn->allocptr.rtsp_transport =
aprintf("Transport: %s\r\n",
data->set.str[STRING_RTSP_TRANSPORT]);
if(!conn->allocptr.rtsp_transport)
return CURLE_OUT_OF_MEMORY;
}
else {
failf(data,
"Refusing to issue an RTSP SETUP without a Transport: header.");
return CURLE_BAD_FUNCTION_ARGUMENT;
}
p_transport = conn->allocptr.rtsp_transport;
}
/* Accept Headers for DESCRIBE requests */
if(rtspreq == RTSPREQ_DESCRIBE) {
/* Accept Header */
p_accept = Curl_checkheaders(data, "Accept:")?
NULL:"Accept: application/sdp\r\n";
/* Accept-Encoding header */
if(!Curl_checkheaders(data, "Accept-Encoding:") &&
data->set.str[STRING_ENCODING]) {
Curl_safefree(conn->allocptr.accept_encoding);
conn->allocptr.accept_encoding =
aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
if(!conn->allocptr.accept_encoding)
return CURLE_OUT_OF_MEMORY;
p_accept_encoding = conn->allocptr.accept_encoding;
}
}
/* The User-Agent string might have been allocated in url.c already, because
it might have been used in the proxy connect, but if we have got a header
with the user-agent string specified, we erase the previously made string
here. */
if(Curl_checkheaders(data, "User-Agent:") && conn->allocptr.uagent) {
Curl_safefree(conn->allocptr.uagent);
conn->allocptr.uagent = NULL;
}
else if(!Curl_checkheaders(data, "User-Agent:") &&
data->set.str[STRING_USERAGENT]) {
p_uagent = conn->allocptr.uagent;
}
/* Referrer */
Curl_safefree(conn->allocptr.ref);
if(data->change.referer && !Curl_checkheaders(data, "Referer:"))
conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
else
conn->allocptr.ref = NULL;
p_referrer = conn->allocptr.ref;
/*
* Range Header
* Only applies to PLAY, PAUSE, RECORD
*
* Go ahead and use the Range stuff supplied for HTTP
*/
if(data->state.use_range &&
(rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) {
/* Check to see if there is a range set in the custom headers */
if(!Curl_checkheaders(data, "Range:") && data->state.range) {
Curl_safefree(conn->allocptr.rangeline);
conn->allocptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
p_range = conn->allocptr.rangeline;
}
}
/*
* Sanity check the custom headers
*/
if(Curl_checkheaders(data, "CSeq:")) {
failf(data, "CSeq cannot be set as a custom header.");
return CURLE_RTSP_CSEQ_ERROR;
}
if(Curl_checkheaders(data, "Session:")) {
failf(data, "Session ID cannot be set as a custom header.");
return CURLE_BAD_FUNCTION_ARGUMENT;
}
/* Initialize a dynamic send buffer */
req_buffer = Curl_add_buffer_init();
if(!req_buffer)
return CURLE_OUT_OF_MEMORY;
result =
Curl_add_bufferf(req_buffer,
"%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
"CSeq: %ld\r\n", /* CSeq */
(p_request ? p_request : ""), p_stream_uri,
rtsp->CSeq_sent);
if(result)
return result;
/*
* Rather than do a normal alloc line, keep the session_id unformatted
* to make comparison easier
*/
if(p_session_id) {
result = Curl_add_bufferf(req_buffer, "Session: %s\r\n", p_session_id);
if(result)
return result;
}
/*
* Shared HTTP-like options
*/
result = Curl_add_bufferf(req_buffer,
"%s" /* transport */
"%s" /* accept */
"%s" /* accept-encoding */
"%s" /* range */
"%s" /* referrer */
"%s" /* user-agent */
,
p_transport ? p_transport : "",
p_accept ? p_accept : "",
p_accept_encoding ? p_accept_encoding : "",
p_range ? p_range : "",
p_referrer ? p_referrer : "",
p_uagent ? p_uagent : "");
if(result)
return result;
if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) {
result = Curl_add_timecondition(data, req_buffer);
if(result)
return result;
}
result = Curl_add_custom_headers(conn, req_buffer);
if(result)
return result;
if(rtspreq == RTSPREQ_ANNOUNCE ||
rtspreq == RTSPREQ_SET_PARAMETER ||
rtspreq == RTSPREQ_GET_PARAMETER) {
if(data->set.upload) {
putsize = data->set.infilesize;
data->set.httpreq = HTTPREQ_PUT;
}
else {
postsize = (data->set.postfieldsize != -1)?
data->set.postfieldsize:
(data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
data->set.httpreq = HTTPREQ_POST;
}
if(putsize > 0 || postsize > 0) {
/* As stated in the http comments, it is probably not wise to
* actually set a custom Content-Length in the headers */
if(!Curl_checkheaders(data, "Content-Length:")) {
result = Curl_add_bufferf(req_buffer,
"Content-Length: %" FORMAT_OFF_T"\r\n",
(data->set.upload ? putsize : postsize));
if(result)
return result;
}
if(rtspreq == RTSPREQ_SET_PARAMETER ||
rtspreq == RTSPREQ_GET_PARAMETER) {
if(!Curl_checkheaders(data, "Content-Type:")) {
result = Curl_add_bufferf(req_buffer,
"Content-Type: text/parameters\r\n");
if(result)
return result;
}
}
if(rtspreq == RTSPREQ_ANNOUNCE) {
if(!Curl_checkheaders(data, "Content-Type:")) {
result = Curl_add_bufferf(req_buffer,
"Content-Type: application/sdp\r\n");
if(result)
return result;
}
}
data->state.expect100header = FALSE; /* RTSP posts are simple/small */
}
else if(rtspreq == RTSPREQ_GET_PARAMETER) {
/* Check for an empty GET_PARAMETER (heartbeat) request */
data->set.httpreq = HTTPREQ_HEAD;
data->set.opt_no_body = TRUE;
}
}
/* RTSP never allows chunked transfer */
data->req.forbidchunk = TRUE;
/* Finish the request buffer */
result = Curl_add_buffer(req_buffer, "\r\n", 2);
if(result)
return result;
if(postsize > 0) {
result = Curl_add_buffer(req_buffer, data->set.postfields,
(size_t)postsize);
if(result)
return result;
}
/* issue the request */
result = Curl_add_buffer_send(req_buffer, conn,
&data->info.request_size, 0, FIRSTSOCKET);
if(result) {
failf(data, "Failed sending RTSP request");
return result;
}
Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount,
putsize?FIRSTSOCKET:-1,
putsize?&http->writebytecount:NULL);
/* Increment the CSeq on success */
data->state.rtsp_next_client_CSeq++;
if(http->writebytecount) {
/* if a request-body has been sent off, we make sure this progress is
noted properly */
Curl_pgrsSetUploadCounter(data, http->writebytecount);
if(Curl_pgrsUpdate(conn))
result = CURLE_ABORTED_BY_CALLBACK;
}
return result;
}
static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data,
struct connectdata *conn,
ssize_t *nread,
bool *readmore) {
struct SingleRequest *k = &data->req;
struct rtsp_conn *rtspc = &(conn->proto.rtspc);
char *rtp; /* moving pointer to rtp data */
ssize_t rtp_dataleft; /* how much data left to parse in this round */
char *scratch;
CURLcode result;
if(rtspc->rtp_buf) {
/* There was some leftover data the last time. Merge buffers */
char *newptr = realloc(rtspc->rtp_buf, rtspc->rtp_bufsize + *nread);
if(!newptr) {
Curl_safefree(rtspc->rtp_buf);
rtspc->rtp_buf = NULL;
rtspc->rtp_bufsize = 0;
return CURLE_OUT_OF_MEMORY;
}
rtspc->rtp_buf = newptr;
memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
rtspc->rtp_bufsize += *nread;
rtp = rtspc->rtp_buf;
rtp_dataleft = rtspc->rtp_bufsize;
}
else {
/* Just parse the request buffer directly */
rtp = k->str;
rtp_dataleft = *nread;
}
while((rtp_dataleft > 0) &&
(rtp[0] == '$')) {
if(rtp_dataleft > 4) {
int rtp_length;
/* Parse the header */
/* The channel identifier immediately follows and is 1 byte */
rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
/* The length is two bytes */
rtp_length = RTP_PKT_LENGTH(rtp);
if(rtp_dataleft < rtp_length + 4) {
/* Need more - incomplete payload*/
*readmore = TRUE;
break;
}
else {
/* We have the full RTP interleaved packet
* Write out the header including the leading '$' */
DEBUGF(infof(data, "RTP write channel %d rtp_length %d\n",
rtspc->rtp_channel, rtp_length));
result = rtp_client_write(conn, &rtp[0], rtp_length + 4);
if(result) {
failf(data, "Got an error writing an RTP packet");
*readmore = FALSE;
Curl_safefree(rtspc->rtp_buf);
rtspc->rtp_buf = NULL;
rtspc->rtp_bufsize = 0;
return result;
}
/* Move forward in the buffer */
rtp_dataleft -= rtp_length + 4;
rtp += rtp_length + 4;
if(data->set.rtspreq == RTSPREQ_RECEIVE) {
/* If we are in a passive receive, give control back
* to the app as often as we can.
*/
k->keepon &= ~KEEP_RECV;
}
}
}
else {
/* Need more - incomplete header */
*readmore = TRUE;
break;
}
}
if(rtp_dataleft != 0 && rtp[0] == '$') {
DEBUGF(infof(data, "RTP Rewinding %zd %s\n", rtp_dataleft,
*readmore ? "(READMORE)" : ""));
/* Store the incomplete RTP packet for a "rewind" */
scratch = malloc(rtp_dataleft);
if(!scratch) {
Curl_safefree(rtspc->rtp_buf);
rtspc->rtp_buf = NULL;
rtspc->rtp_bufsize = 0;
return CURLE_OUT_OF_MEMORY;
}
memcpy(scratch, rtp, rtp_dataleft);
Curl_safefree(rtspc->rtp_buf);
rtspc->rtp_buf = scratch;
rtspc->rtp_bufsize = rtp_dataleft;
/* As far as the transfer is concerned, this data is consumed */
*nread = 0;
return CURLE_OK;
}
else {
/* Fix up k->str to point just after the last RTP packet */
k->str += *nread - rtp_dataleft;
/* either all of the data has been read or...
* rtp now points at the next byte to parse
*/
if(rtp_dataleft > 0)
DEBUGASSERT(k->str[0] == rtp[0]);
DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */
*nread = rtp_dataleft;
}
/* If we get here, we have finished with the leftover/merge buffer */
Curl_safefree(rtspc->rtp_buf);
rtspc->rtp_buf = NULL;
rtspc->rtp_bufsize = 0;
return CURLE_OK;
}
static
CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len)
{
struct SessionHandle *data = conn->data;
size_t wrote;
curl_write_callback writeit;
if(len == 0) {
failf (data, "Cannot write a 0 size RTP packet.");
return CURLE_WRITE_ERROR;
}
writeit = data->set.fwrite_rtp?data->set.fwrite_rtp:data->set.fwrite_func;
wrote = writeit(ptr, 1, len, data->set.rtp_out);
if(CURL_WRITEFUNC_PAUSE == wrote) {
failf (data, "Cannot pause RTP");
return CURLE_WRITE_ERROR;
}
if(wrote != len) {
failf (data, "Failed writing RTP data");
return CURLE_WRITE_ERROR;
}
return CURLE_OK;
}
CURLcode Curl_rtsp_parseheader(struct connectdata *conn,
char *header)
{
struct SessionHandle *data = conn->data;
long CSeq = 0;
if(checkprefix("CSeq:", header)) {
/* Store the received CSeq. Match is verified in rtsp_done */
int nc = sscanf(&header[4], ": %ld", &CSeq);
if(nc == 1) {
struct RTSP *rtsp = data->req.protop;
rtsp->CSeq_recv = CSeq; /* mark the request */
data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
}
else {
failf(data, "Unable to read the CSeq header: [%s]", header);
return CURLE_RTSP_CSEQ_ERROR;
}
}
else if(checkprefix("Session:", header)) {
char *start;
/* Find the first non-space letter */
start = header + 9;
while(*start && ISSPACE(*start))
start++;
if(!*start) {
failf(data, "Got a blank Session ID");
}
else if(data->set.str[STRING_RTSP_SESSION_ID]) {
/* If the Session ID is set, then compare */
if(strncmp(start, data->set.str[STRING_RTSP_SESSION_ID],
strlen(data->set.str[STRING_RTSP_SESSION_ID])) != 0) {
failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
start, data->set.str[STRING_RTSP_SESSION_ID]);
return CURLE_RTSP_SESSION_ERROR;
}
}
else {
/* If the Session ID is not set, and we find it in a response, then
set it */
/* The session ID can be an alphanumeric or a 'safe' character
*
* RFC 2326 15.1 Base Syntax:
* safe = "\$" | "-" | "_" | "." | "+"
* */
char *end = start;
while(*end &&
(ISALNUM(*end) || *end == '-' || *end == '_' || *end == '.' ||
*end == '+' ||
(*end == '\\' && *(end + 1) && *(end + 1) == '$' && (++end, 1))))
end++;
/* Copy the id substring into a new buffer */
data->set.str[STRING_RTSP_SESSION_ID] = malloc(end - start + 1);
if(data->set.str[STRING_RTSP_SESSION_ID] == NULL)
return CURLE_OUT_OF_MEMORY;
memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, end - start);
(data->set.str[STRING_RTSP_SESSION_ID])[end - start] = '\0';
}
}
return CURLE_OK;
}
#endif /* CURL_DISABLE_RTSP */
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