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d5ed571948
curl/lib/rtsp.c
Daniel Stenberg e15e51384a
http: move header storage to Curl_easy from connectdata 
Since the connection can be used by many independent requests (using
HTTP/2 or HTTP/3), things like user-agent and other transfer-specific
data MUST NOT be kept connection oriented as it could lead to requests
getting the wrong string for their requests. This struct data was
lingering like this due to old HTTP1 legacy thinking where it didn't
mattered..

Fixes #5566
Closes #5567
2020-06-15 22:56:25 +02:00

820 lines
25 KiB
C
Raw Blame History

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2020, 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 https://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 "strcase.h"
#include "select.h"
#include "connect.h"
#include "strdup.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#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);
/*
* 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 Curl_easy *data,
struct connectdata *conn,
ssize_t *nread,
bool *readmore);
static CURLcode rtsp_setup_connection(struct connectdata *conn);
static unsigned int rtsp_conncheck(struct connectdata *check,
unsigned int checks_to_perform);
/* 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)
{
/* write mode */
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 */
rtsp_conncheck, /* connection_check */
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_connalive() to peek at the socket
* and distinguish between closed and data.
*/
static bool rtsp_connisdead(struct connectdata *check)
{
int sval;
bool ret_val = TRUE;
sval = SOCKET_READABLE(check->sock[FIRSTSOCKET], 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) {
/* readable with no error. could still be closed */
ret_val = !Curl_connalive(check);
}
return ret_val;
}
/*
* Function to check on various aspects of a connection.
*/
static unsigned int rtsp_conncheck(struct connectdata *check,
unsigned int checks_to_perform)
{
unsigned int ret_val = CONNRESULT_NONE;
if(checks_to_perform & CONNCHECK_ISDEAD) {
if(rtsp_connisdead(check))
ret_val |= CONNRESULT_DEAD;
}
return ret_val;
}
static CURLcode rtsp_connect(struct connectdata *conn, bool *done)
{
CURLcode httpStatus;
struct Curl_easy *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 Curl_easy *data = conn->data;
struct RTSP *rtsp = data->req.protop;
CURLcode httpStatus;
/* 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 */
long CSeq_sent = rtsp->CSeq_sent;
long 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;
}
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);
}
}
return httpStatus;
}
static CURLcode rtsp_do(struct connectdata *conn, bool *done)
{
struct Curl_easy *data = conn->data;
CURLcode result = CURLE_OK;
Curl_RtspReq rtspreq = data->set.rtspreq;
struct RTSP *rtsp = data->req.protop;
struct dynbuf 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;
const char *p_proxyuserpwd = NULL;
const char *p_userpwd = NULL;
*done = TRUE;
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.
**/
data->set.opt_no_body = TRUE; /* most requests don't contain a body */
switch(rtspreq) {
default:
failf(data, "Got invalid RTSP request");
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(data, FIRSTSOCKET, -1, TRUE, -1);
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);
return CURLE_BAD_FUNCTION_ARGUMENT;
}
/* 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(conn, "Transport");
if(rtspreq == RTSPREQ_SETUP && !p_transport) {
/* New Transport: setting? */
if(data->set.str[STRING_RTSP_TRANSPORT]) {
Curl_safefree(data->state.aptr.rtsp_transport);
data->state.aptr.rtsp_transport =
aprintf("Transport: %s\r\n",
data->set.str[STRING_RTSP_TRANSPORT]);
if(!data->state.aptr.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 = data->state.aptr.rtsp_transport;
}
/* Accept Headers for DESCRIBE requests */
if(rtspreq == RTSPREQ_DESCRIBE) {
/* Accept Header */
p_accept = Curl_checkheaders(conn, "Accept")?
NULL:"Accept: application/sdp\r\n";
/* Accept-Encoding header */
if(!Curl_checkheaders(conn, "Accept-Encoding") &&
data->set.str[STRING_ENCODING]) {
Curl_safefree(data->state.aptr.accept_encoding);
data->state.aptr.accept_encoding =
aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
if(!data->state.aptr.accept_encoding)
return CURLE_OUT_OF_MEMORY;
p_accept_encoding = data->state.aptr.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(conn, "User-Agent") && data->state.aptr.uagent) {
Curl_safefree(data->state.aptr.uagent);
data->state.aptr.uagent = NULL;
}
else if(!Curl_checkheaders(conn, "User-Agent") &&
data->set.str[STRING_USERAGENT]) {
p_uagent = data->state.aptr.uagent;
}
/* setup the authentication headers */
result = Curl_http_output_auth(conn, p_request, p_stream_uri, FALSE);
if(result)
return result;
p_proxyuserpwd = data->state.aptr.proxyuserpwd;
p_userpwd = data->state.aptr.userpwd;
/* Referrer */
Curl_safefree(data->state.aptr.ref);
if(data->change.referer && !Curl_checkheaders(conn, "Referer"))
data->state.aptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
else
data->state.aptr.ref = NULL;
p_referrer = data->state.aptr.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(conn, "Range") && data->state.range) {
Curl_safefree(data->state.aptr.rangeline);
data->state.aptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
p_range = data->state.aptr.rangeline;
}
}
/*
* Sanity check the custom headers
*/
if(Curl_checkheaders(conn, "CSeq")) {
failf(data, "CSeq cannot be set as a custom header.");
return CURLE_RTSP_CSEQ_ERROR;
}
if(Curl_checkheaders(conn, "Session")) {
failf(data, "Session ID cannot be set as a custom header.");
return CURLE_BAD_FUNCTION_ARGUMENT;
}
/* Initialize a dynamic send buffer */
Curl_dyn_init(&req_buffer, DYN_RTSP_REQ_HEADER);
result =
Curl_dyn_addf(&req_buffer,
"%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
"CSeq: %ld\r\n", /* CSeq */
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_dyn_addf(&req_buffer, "Session: %s\r\n", p_session_id);
if(result)
return result;
}
/*
* Shared HTTP-like options
*/
result = Curl_dyn_addf(&req_buffer,
"%s" /* transport */
"%s" /* accept */
"%s" /* accept-encoding */
"%s" /* range */
"%s" /* referrer */
"%s" /* user-agent */
"%s" /* proxyuserpwd */
"%s" /* userpwd */
,
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 : "",
p_proxyuserpwd ? p_proxyuserpwd : "",
p_userpwd ? p_userpwd : "");
/*
* Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
* with basic and digest, it will be freed anyway by the next request
*/
Curl_safefree(data->state.aptr.userpwd);
data->state.aptr.userpwd = NULL;
if(result)
return result;
if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) {
result = Curl_add_timecondition(conn, &req_buffer);
if(result)
return result;
}
result = Curl_add_custom_headers(conn, FALSE, &req_buffer);
if(result)
return result;
if(rtspreq == RTSPREQ_ANNOUNCE ||
rtspreq == RTSPREQ_SET_PARAMETER ||
rtspreq == RTSPREQ_GET_PARAMETER) {
if(data->set.upload) {
putsize = data->state.infilesize;
data->state.httpreq = HTTPREQ_PUT;
}
else {
postsize = (data->state.infilesize != -1)?
data->state.infilesize:
(data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
data->state.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(conn, "Content-Length")) {
result =
Curl_dyn_addf(&req_buffer,
"Content-Length: %" CURL_FORMAT_CURL_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(conn, "Content-Type")) {
result = Curl_dyn_addf(&req_buffer,
"Content-Type: text/parameters\r\n");
if(result)
return result;
}
}
if(rtspreq == RTSPREQ_ANNOUNCE) {
if(!Curl_checkheaders(conn, "Content-Type")) {
result = Curl_dyn_addf(&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->state.httpreq = HTTPREQ_HEAD;
data->set.opt_no_body = TRUE;
}
}
/* RTSP never allows chunked transfer */
data->req.forbidchunk = TRUE;
/* Finish the request buffer */
result = Curl_dyn_add(&req_buffer, "\r\n");
if(result)
return result;
if(postsize > 0) {
result = Curl_dyn_addn(&req_buffer, data->set.postfields,
(size_t)postsize);
if(result)
return result;
}
/* issue the request */
result = Curl_buffer_send(&req_buffer, conn,
&data->info.request_size, 0, FIRSTSOCKET);
if(result) {
failf(data, "Failed sending RTSP request");
return result;
}
Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, putsize?FIRSTSOCKET:-1);
/* Increment the CSeq on success */
data->state.rtsp_next_client_CSeq++;
if(data->req.writebytecount) {
/* if a request-body has been sent off, we make sure this progress is
noted properly */
Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
if(Curl_pgrsUpdate(conn))
result = CURLE_ABORTED_BY_CALLBACK;
}
return result;
}
static CURLcode rtsp_rtp_readwrite(struct Curl_easy *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 = Curl_saferealloc(rtspc->rtp_buf,
rtspc->rtp_bufsize + *nread);
if(!newptr) {
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] == '$')) {
if(rtp_dataleft > 4) {
int rtp_length;
/* Parse the header */
/* The channel identifier immediately follows and is 1 byte */
rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
/* The length is two bytes */
rtp_length = RTP_PKT_LENGTH(rtp);
if(rtp_dataleft < rtp_length + 4) {
/* Need more - incomplete payload*/
*readmore = TRUE;
break;
}
/* We have the full RTP interleaved packet
* Write out the header including the leading '$' */
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;
}
/* 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 Curl_easy *data = conn->data;
size_t wrote;
curl_write_callback writeit;
void *user_ptr;
if(len == 0) {
failf(data, "Cannot write a 0 size RTP packet.");
return CURLE_WRITE_ERROR;
}
/* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
pointer to write out the RTP data. */
if(data->set.fwrite_rtp) {
writeit = data->set.fwrite_rtp;
user_ptr = data->set.rtp_out;
}
else {
writeit = data->set.fwrite_func;
user_ptr = data->set.out;
}
Curl_set_in_callback(data, true);
wrote = writeit(ptr, 1, len, user_ptr);
Curl_set_in_callback(data, false);
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 Curl_easy *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 + 8;
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.
*
* Allow any non whitespace content, up to the field separator or end of
* line. RFC 2326 isn't 100% clear on the session ID and for example
* gstreamer does url-encoded session ID's not covered by the standard.
*/
char *end = start;
while(*end && *end != ';' && !ISSPACE(*end))
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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