rtsp.c@ 98341

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libs/{curl,libxml2}: OSE export fixes, bugref:8515
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1	/***************************************************************************
2	* _ _ ____ _
3	* Project ___\| \| \| \| _ \\| \|
4	* / __\| \| \| \| \|_) \| \|
5	* \| (__\| \|_\| \| _ <\| \|___
6	* \___\|\___/\|_\| \_\_____\|
7	*
8	* Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, et al.
9	*
10	* This software is licensed as described in the file COPYING, which
11	* you should have received as part of this distribution. The terms
12	* are also available at https://curl.se/docs/copyright.html.
13	*
14	* You may opt to use, copy, modify, merge, publish, distribute and/or sell
15	* copies of the Software, and permit persons to whom the Software is
16	* furnished to do so, under the terms of the COPYING file.
17	*
18	* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19	* KIND, either express or implied.
20	*
21	***************************************************************************/
22
23	#include "curl_setup.h"
24
25	#if !defined(CURL_DISABLE_RTSP) && !defined(USE_HYPER)
26
27	#include "urldata.h"
28	#include <curl/curl.h>
29	#include "transfer.h"
30	#include "sendf.h"
31	#include "multiif.h"
32	#include "http.h"
33	#include "url.h"
34	#include "progress.h"
35	#include "rtsp.h"
36	#include "strcase.h"
37	#include "select.h"
38	#include "connect.h"
39	#include "strdup.h"
40	/* The last 3 #include files should be in this order */
41	#include "curl_printf.h"
42	#include "curl_memory.h"
43	#include "memdebug.h"
44
45	#define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1])))
46
47	#define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) \| \
48	((int)((unsigned char)((p)[3]))))
49
50	/* protocol-specific functions set up to be called by the main engine */
51	static CURLcode rtsp_do(struct Curl_easy data, bool done);
52	static CURLcode rtsp_done(struct Curl_easy *data, CURLcode, bool premature);
53	static CURLcode rtsp_connect(struct Curl_easy data, bool done);
54	static CURLcode rtsp_disconnect(struct Curl_easy *data,
55	struct connectdata *conn, bool dead);
56	static int rtsp_getsock_do(struct Curl_easy *data,
57	struct connectdata conn, curl_socket_t socks);
58
59	/*
60	* Parse and write out any available RTP data.
61	*
62	* nread: amount of data left after k->str. will be modified if RTP
63	* data is parsed and k->str is moved up
64	* readmore: whether or not the RTP parser needs more data right away
65	*/
66	static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
67	struct connectdata *conn,
68	ssize_t *nread,
69	bool *readmore);
70
71	static CURLcode rtsp_setup_connection(struct Curl_easy *data,
72	struct connectdata *conn);
73	static unsigned int rtsp_conncheck(struct Curl_easy *data,
74	struct connectdata *check,
75	unsigned int checks_to_perform);
76
77	/* this returns the socket to wait for in the DO and DOING state for the multi
78	interface and then we're always _sending_ a request and thus we wait for
79	the single socket to become writable only */
80	static int rtsp_getsock_do(struct Curl_easy data, struct connectdata conn,
81	curl_socket_t *socks)
82	{
83	/* write mode */
84	(void)data;
85	socks[0] = conn->sock[FIRSTSOCKET];
86	return GETSOCK_WRITESOCK(0);
87	}
88
89	static
90	CURLcode rtp_client_write(struct Curl_easy data, char ptr, size_t len);
91
92
93	/*
94	* RTSP handler interface.
95	*/
96	const struct Curl_handler Curl_handler_rtsp = {
97	"RTSP", /* scheme */
98	rtsp_setup_connection, /* setup_connection */
99	rtsp_do, /* do_it */
100	rtsp_done, /* done */
101	ZERO_NULL, /* do_more */
102	rtsp_connect, /* connect_it */
103	ZERO_NULL, /* connecting */
104	ZERO_NULL, /* doing */
105	ZERO_NULL, /* proto_getsock */
106	rtsp_getsock_do, /* doing_getsock */
107	ZERO_NULL, /* domore_getsock */
108	ZERO_NULL, /* perform_getsock */
109	rtsp_disconnect, /* disconnect */
110	rtsp_rtp_readwrite, /* readwrite */
111	rtsp_conncheck, /* connection_check */
112	ZERO_NULL, /* attach connection */
113	PORT_RTSP, /* defport */
114	CURLPROTO_RTSP, /* protocol */
115	CURLPROTO_RTSP, /* family */
116	PROTOPT_NONE /* flags */
117	};
118
119
120	static CURLcode rtsp_setup_connection(struct Curl_easy *data,
121	struct connectdata *conn)
122	{
123	struct RTSP *rtsp;
124	(void)conn;
125
126	data->req.p.rtsp = rtsp = calloc(1, sizeof(struct RTSP));
127	if(!rtsp)
128	return CURLE_OUT_OF_MEMORY;
129
130	return CURLE_OK;
131	}
132
133
134	/*
135	* The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not
136	* want to block the application forever while receiving a stream. Therefore,
137	* we cannot assume that an RTSP socket is dead just because it is readable.
138	*
139	* Instead, if it is readable, run Curl_connalive() to peek at the socket
140	* and distinguish between closed and data.
141	*/
142	static bool rtsp_connisdead(struct connectdata *check)
143	{
144	int sval;
145	bool ret_val = TRUE;
146
147	sval = SOCKET_READABLE(check->sock[FIRSTSOCKET], 0);
148	if(sval == 0) {
149	/* timeout */
150	ret_val = FALSE;
151	}
152	else if(sval & CURL_CSELECT_ERR) {
153	/* socket is in an error state */
154	ret_val = TRUE;
155	}
156	else if(sval & CURL_CSELECT_IN) {
157	/* readable with no error. could still be closed */
158	ret_val = !Curl_connalive(check);
159	}
160
161	return ret_val;
162	}
163
164	/*
165	* Function to check on various aspects of a connection.
166	*/
167	static unsigned int rtsp_conncheck(struct Curl_easy *data,
168	struct connectdata *conn,
169	unsigned int checks_to_perform)
170	{
171	unsigned int ret_val = CONNRESULT_NONE;
172	(void)data;
173
174	if(checks_to_perform & CONNCHECK_ISDEAD) {
175	if(rtsp_connisdead(conn))
176	ret_val \|= CONNRESULT_DEAD;
177	}
178
179	return ret_val;
180	}
181
182
183	static CURLcode rtsp_connect(struct Curl_easy data, bool done)
184	{
185	CURLcode httpStatus;
186
187	httpStatus = Curl_http_connect(data, done);
188
189	/* Initialize the CSeq if not already done */
190	if(data->state.rtsp_next_client_CSeq == 0)
191	data->state.rtsp_next_client_CSeq = 1;
192	if(data->state.rtsp_next_server_CSeq == 0)
193	data->state.rtsp_next_server_CSeq = 1;
194
195	data->conn->proto.rtspc.rtp_channel = -1;
196
197	return httpStatus;
198	}
199
200	static CURLcode rtsp_disconnect(struct Curl_easy *data,
201	struct connectdata *conn, bool dead)
202	{
203	(void) dead;
204	(void) data;
205	Curl_safefree(conn->proto.rtspc.rtp_buf);
206	return CURLE_OK;
207	}
208
209
210	static CURLcode rtsp_done(struct Curl_easy *data,
211	CURLcode status, bool premature)
212	{
213	struct RTSP *rtsp = data->req.p.rtsp;
214	CURLcode httpStatus;
215
216	/* Bypass HTTP empty-reply checks on receive */
217	if(data->set.rtspreq == RTSPREQ_RECEIVE)
218	premature = TRUE;
219
220	httpStatus = Curl_http_done(data, status, premature);
221
222	if(rtsp && !status && !httpStatus) {
223	/* Check the sequence numbers */
224	long CSeq_sent = rtsp->CSeq_sent;
225	long CSeq_recv = rtsp->CSeq_recv;
226	if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
227	failf(data,
228	"The CSeq of this request %ld did not match the response %ld",
229	CSeq_sent, CSeq_recv);
230	return CURLE_RTSP_CSEQ_ERROR;
231	}
232	if(data->set.rtspreq == RTSPREQ_RECEIVE &&
233	(data->conn->proto.rtspc.rtp_channel == -1)) {
234	infof(data, "Got an RTP Receive with a CSeq of %ld", CSeq_recv);
235	}
236	}
237
238	return httpStatus;
239	}
240
241	static CURLcode rtsp_do(struct Curl_easy data, bool done)
242	{
243	struct connectdata *conn = data->conn;
244	CURLcode result = CURLE_OK;
245	Curl_RtspReq rtspreq = data->set.rtspreq;
246	struct RTSP *rtsp = data->req.p.rtsp;
247	struct dynbuf req_buffer;
248	curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
249	curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
250
251	const char *p_request = NULL;
252	const char *p_session_id = NULL;
253	const char *p_accept = NULL;
254	const char *p_accept_encoding = NULL;
255	const char *p_range = NULL;
256	const char *p_referrer = NULL;
257	const char *p_stream_uri = NULL;
258	const char *p_transport = NULL;
259	const char *p_uagent = NULL;
260	const char *p_proxyuserpwd = NULL;
261	const char *p_userpwd = NULL;
262
263	*done = TRUE;
264
265	rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
266	rtsp->CSeq_recv = 0;
267
268	/* Setup the 'p_request' pointer to the proper p_request string
269	* Since all RTSP requests are included here, there is no need to
270	* support custom requests like HTTP.
271	**/
272	data->set.opt_no_body = TRUE; /* most requests don't contain a body */
273	switch(rtspreq) {
274	default:
275	failf(data, "Got invalid RTSP request");
276	return CURLE_BAD_FUNCTION_ARGUMENT;
277	case RTSPREQ_OPTIONS:
278	p_request = "OPTIONS";
279	break;
280	case RTSPREQ_DESCRIBE:
281	p_request = "DESCRIBE";
282	data->set.opt_no_body = FALSE;
283	break;
284	case RTSPREQ_ANNOUNCE:
285	p_request = "ANNOUNCE";
286	break;
287	case RTSPREQ_SETUP:
288	p_request = "SETUP";
289	break;
290	case RTSPREQ_PLAY:
291	p_request = "PLAY";
292	break;
293	case RTSPREQ_PAUSE:
294	p_request = "PAUSE";
295	break;
296	case RTSPREQ_TEARDOWN:
297	p_request = "TEARDOWN";
298	break;
299	case RTSPREQ_GET_PARAMETER:
300	/* GET_PARAMETER's no_body status is determined later */
301	p_request = "GET_PARAMETER";
302	data->set.opt_no_body = FALSE;
303	break;
304	case RTSPREQ_SET_PARAMETER:
305	p_request = "SET_PARAMETER";
306	break;
307	case RTSPREQ_RECORD:
308	p_request = "RECORD";
309	break;
310	case RTSPREQ_RECEIVE:
311	p_request = "";
312	/* Treat interleaved RTP as body*/
313	data->set.opt_no_body = FALSE;
314	break;
315	case RTSPREQ_LAST:
316	failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
317	return CURLE_BAD_FUNCTION_ARGUMENT;
318	}
319
320	if(rtspreq == RTSPREQ_RECEIVE) {
321	Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, -1);
322
323	return result;
324	}
325
326	p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
327	if(!p_session_id &&
328	(rtspreq & ~(RTSPREQ_OPTIONS \| RTSPREQ_DESCRIBE \| RTSPREQ_SETUP))) {
329	failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
330	p_request);
331	return CURLE_BAD_FUNCTION_ARGUMENT;
332	}
333
334	/* Stream URI. Default to server '' if not specified /
335	if(data->set.str[STRING_RTSP_STREAM_URI]) {
336	p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
337	}
338	else {
339	p_stream_uri = "*";
340	}
341
342	/* Transport Header for SETUP requests */
343	p_transport = Curl_checkheaders(data, STRCONST("Transport"));
344	if(rtspreq == RTSPREQ_SETUP && !p_transport) {
345	/* New Transport: setting? */
346	if(data->set.str[STRING_RTSP_TRANSPORT]) {
347	Curl_safefree(data->state.aptr.rtsp_transport);
348
349	data->state.aptr.rtsp_transport =
350	aprintf("Transport: %s\r\n",
351	data->set.str[STRING_RTSP_TRANSPORT]);
352	if(!data->state.aptr.rtsp_transport)
353	return CURLE_OUT_OF_MEMORY;
354	}
355	else {
356	failf(data,
357	"Refusing to issue an RTSP SETUP without a Transport: header.");
358	return CURLE_BAD_FUNCTION_ARGUMENT;
359	}
360
361	p_transport = data->state.aptr.rtsp_transport;
362	}
363
364	/* Accept Headers for DESCRIBE requests */
365	if(rtspreq == RTSPREQ_DESCRIBE) {
366	/* Accept Header */
367	p_accept = Curl_checkheaders(data, STRCONST("Accept"))?
368	NULL:"Accept: application/sdp\r\n";
369
370	/* Accept-Encoding header */
371	if(!Curl_checkheaders(data, STRCONST("Accept-Encoding")) &&
372	data->set.str[STRING_ENCODING]) {
373	Curl_safefree(data->state.aptr.accept_encoding);
374	data->state.aptr.accept_encoding =
375	aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
376
377	if(!data->state.aptr.accept_encoding)
378	return CURLE_OUT_OF_MEMORY;
379
380	p_accept_encoding = data->state.aptr.accept_encoding;
381	}
382	}
383
384	/* The User-Agent string might have been allocated in url.c already, because
385	it might have been used in the proxy connect, but if we have got a header
386	with the user-agent string specified, we erase the previously made string
387	here. */
388	if(Curl_checkheaders(data, STRCONST("User-Agent")) &&
389	data->state.aptr.uagent) {
390	Curl_safefree(data->state.aptr.uagent);
391	data->state.aptr.uagent = NULL;
392	}
393	else if(!Curl_checkheaders(data, STRCONST("User-Agent")) &&
394	data->set.str[STRING_USERAGENT]) {
395	p_uagent = data->state.aptr.uagent;
396	}
397
398	/* setup the authentication headers */
399	result = Curl_http_output_auth(data, conn, p_request, HTTPREQ_GET,
400	p_stream_uri, FALSE);
401	if(result)
402	return result;
403
404	p_proxyuserpwd = data->state.aptr.proxyuserpwd;
405	p_userpwd = data->state.aptr.userpwd;
406
407	/* Referrer */
408	Curl_safefree(data->state.aptr.ref);
409	if(data->state.referer && !Curl_checkheaders(data, STRCONST("Referer")))
410	data->state.aptr.ref = aprintf("Referer: %s\r\n", data->state.referer);
411	else
412	data->state.aptr.ref = NULL;
413
414	p_referrer = data->state.aptr.ref;
415
416	/*
417	* Range Header
418	* Only applies to PLAY, PAUSE, RECORD
419	*
420	* Go ahead and use the Range stuff supplied for HTTP
421	*/
422	if(data->state.use_range &&
423	(rtspreq & (RTSPREQ_PLAY \| RTSPREQ_PAUSE \| RTSPREQ_RECORD))) {
424
425	/* Check to see if there is a range set in the custom headers */
426	if(!Curl_checkheaders(data, STRCONST("Range")) && data->state.range) {
427	Curl_safefree(data->state.aptr.rangeline);
428	data->state.aptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
429	p_range = data->state.aptr.rangeline;
430	}
431	}
432
433	/*
434	* Sanity check the custom headers
435	*/
436	if(Curl_checkheaders(data, STRCONST("CSeq"))) {
437	failf(data, "CSeq cannot be set as a custom header.");
438	return CURLE_RTSP_CSEQ_ERROR;
439	}
440	if(Curl_checkheaders(data, STRCONST("Session"))) {
441	failf(data, "Session ID cannot be set as a custom header.");
442	return CURLE_BAD_FUNCTION_ARGUMENT;
443	}
444
445	/* Initialize a dynamic send buffer */
446	Curl_dyn_init(&req_buffer, DYN_RTSP_REQ_HEADER);
447
448	result =
449	Curl_dyn_addf(&req_buffer,
450	"%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
451	"CSeq: %ld\r\n", /* CSeq */
452	p_request, p_stream_uri, rtsp->CSeq_sent);
453	if(result)
454	return result;
455
456	/*
457	* Rather than do a normal alloc line, keep the session_id unformatted
458	* to make comparison easier
459	*/
460	if(p_session_id) {
461	result = Curl_dyn_addf(&req_buffer, "Session: %s\r\n", p_session_id);
462	if(result)
463	return result;
464	}
465
466	/*
467	* Shared HTTP-like options
468	*/
469	result = Curl_dyn_addf(&req_buffer,
470	"%s" /* transport */
471	"%s" /* accept */
472	"%s" /* accept-encoding */
473	"%s" /* range */
474	"%s" /* referrer */
475	"%s" /* user-agent */
476	"%s" /* proxyuserpwd */
477	"%s" /* userpwd */
478	,
479	p_transport ? p_transport : "",
480	p_accept ? p_accept : "",
481	p_accept_encoding ? p_accept_encoding : "",
482	p_range ? p_range : "",
483	p_referrer ? p_referrer : "",
484	p_uagent ? p_uagent : "",
485	p_proxyuserpwd ? p_proxyuserpwd : "",
486	p_userpwd ? p_userpwd : "");
487
488	/*
489	* Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
490	* with basic and digest, it will be freed anyway by the next request
491	*/
492	Curl_safefree(data->state.aptr.userpwd);
493	data->state.aptr.userpwd = NULL;
494
495	if(result)
496	return result;
497
498	if((rtspreq == RTSPREQ_SETUP) \|\| (rtspreq == RTSPREQ_DESCRIBE)) {
499	result = Curl_add_timecondition(data, &req_buffer);
500	if(result)
501	return result;
502	}
503
504	result = Curl_add_custom_headers(data, FALSE, &req_buffer);
505	if(result)
506	return result;
507
508	if(rtspreq == RTSPREQ_ANNOUNCE \|\|
509	rtspreq == RTSPREQ_SET_PARAMETER \|\|
510	rtspreq == RTSPREQ_GET_PARAMETER) {
511
512	if(data->set.upload) {
513	putsize = data->state.infilesize;
514	data->state.httpreq = HTTPREQ_PUT;
515
516	}
517	else {
518	postsize = (data->state.infilesize != -1)?
519	data->state.infilesize:
520	(data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
521	data->state.httpreq = HTTPREQ_POST;
522	}
523
524	if(putsize > 0 \|\| postsize > 0) {
525	/* As stated in the http comments, it is probably not wise to
526	* actually set a custom Content-Length in the headers */
527	if(!Curl_checkheaders(data, STRCONST("Content-Length"))) {
528	result =
529	Curl_dyn_addf(&req_buffer,
530	"Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
531	(data->set.upload ? putsize : postsize));
532	if(result)
533	return result;
534	}
535
536	if(rtspreq == RTSPREQ_SET_PARAMETER \|\|
537	rtspreq == RTSPREQ_GET_PARAMETER) {
538	if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
539	result = Curl_dyn_addn(&req_buffer,
540	STRCONST("Content-Type: "
541	"text/parameters\r\n"));
542	if(result)
543	return result;
544	}
545	}
546
547	if(rtspreq == RTSPREQ_ANNOUNCE) {
548	if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
549	result = Curl_dyn_addn(&req_buffer,
550	STRCONST("Content-Type: "
551	"application/sdp\r\n"));
552	if(result)
553	return result;
554	}
555	}
556
557	data->state.expect100header = FALSE; /* RTSP posts are simple/small */
558	}
559	else if(rtspreq == RTSPREQ_GET_PARAMETER) {
560	/* Check for an empty GET_PARAMETER (heartbeat) request */
561	data->state.httpreq = HTTPREQ_HEAD;
562	data->set.opt_no_body = TRUE;
563	}
564	}
565
566	/* RTSP never allows chunked transfer */
567	data->req.forbidchunk = TRUE;
568	/* Finish the request buffer */
569	result = Curl_dyn_addn(&req_buffer, STRCONST("\r\n"));
570	if(result)
571	return result;
572
573	if(postsize > 0) {
574	result = Curl_dyn_addn(&req_buffer, data->set.postfields,
575	(size_t)postsize);
576	if(result)
577	return result;
578	}
579
580	/* issue the request */
581	result = Curl_buffer_send(&req_buffer, data,
582	&data->info.request_size, 0, FIRSTSOCKET);
583	if(result) {
584	failf(data, "Failed sending RTSP request");
585	return result;
586	}
587
588	Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, putsize?FIRSTSOCKET:-1);
589
590	/* Increment the CSeq on success */
591	data->state.rtsp_next_client_CSeq++;
592
593	if(data->req.writebytecount) {
594	/* if a request-body has been sent off, we make sure this progress is
595	noted properly */
596	Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
597	if(Curl_pgrsUpdate(data))
598	result = CURLE_ABORTED_BY_CALLBACK;
599	}
600
601	return result;
602	}
603
604
605	static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
606	struct connectdata *conn,
607	ssize_t *nread,
608	bool *readmore) {
609	struct SingleRequest *k = &data->req;
610	struct rtsp_conn *rtspc = &(conn->proto.rtspc);
611
612	char rtp; / moving pointer to rtp data */
613	ssize_t rtp_dataleft; /* how much data left to parse in this round */
614	char *scratch;
615	CURLcode result;
616
617	if(rtspc->rtp_buf) {
618	/* There was some leftover data the last time. Merge buffers */
619	char *newptr = Curl_saferealloc(rtspc->rtp_buf,
620	rtspc->rtp_bufsize + *nread);
621	if(!newptr) {
622	rtspc->rtp_buf = NULL;
623	rtspc->rtp_bufsize = 0;
624	return CURLE_OUT_OF_MEMORY;
625	}
626	rtspc->rtp_buf = newptr;
627	memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
628	rtspc->rtp_bufsize += *nread;
629	rtp = rtspc->rtp_buf;
630	rtp_dataleft = rtspc->rtp_bufsize;
631	}
632	else {
633	/* Just parse the request buffer directly */
634	rtp = k->str;
635	rtp_dataleft = *nread;
636	}
637
638	while((rtp_dataleft > 0) &&
639	(rtp[0] == '$')) {
640	if(rtp_dataleft > 4) {
641	int rtp_length;
642
643	/* Parse the header */
644	/* The channel identifier immediately follows and is 1 byte */
645	rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
646
647	/* The length is two bytes */
648	rtp_length = RTP_PKT_LENGTH(rtp);
649
650	if(rtp_dataleft < rtp_length + 4) {
651	/* Need more - incomplete payload*/
652	*readmore = TRUE;
653	break;
654	}
655	/* We have the full RTP interleaved packet
656	* Write out the header including the leading '$' */
657	DEBUGF(infof(data, "RTP write channel %d rtp_length %d",
658	rtspc->rtp_channel, rtp_length));
659	result = rtp_client_write(data, &rtp[0], rtp_length + 4);
660	if(result) {
661	failf(data, "Got an error writing an RTP packet");
662	*readmore = FALSE;
663	Curl_safefree(rtspc->rtp_buf);
664	rtspc->rtp_buf = NULL;
665	rtspc->rtp_bufsize = 0;
666	return result;
667	}
668
669	/* Move forward in the buffer */
670	rtp_dataleft -= rtp_length + 4;
671	rtp += rtp_length + 4;
672
673	if(data->set.rtspreq == RTSPREQ_RECEIVE) {
674	/* If we are in a passive receive, give control back
675	* to the app as often as we can.
676	*/
677	k->keepon &= ~KEEP_RECV;
678	}
679	}
680	else {
681	/* Need more - incomplete header */
682	*readmore = TRUE;
683	break;
684	}
685	}
686
687	if(rtp_dataleft && rtp[0] == '$') {
688	DEBUGF(infof(data, "RTP Rewinding %zd %s", rtp_dataleft,
689	*readmore ? "(READMORE)" : ""));
690
691	/* Store the incomplete RTP packet for a "rewind" */
692	scratch = malloc(rtp_dataleft);
693	if(!scratch) {
694	Curl_safefree(rtspc->rtp_buf);
695	rtspc->rtp_buf = NULL;
696	rtspc->rtp_bufsize = 0;
697	return CURLE_OUT_OF_MEMORY;
698	}
699	memcpy(scratch, rtp, rtp_dataleft);
700	Curl_safefree(rtspc->rtp_buf);
701	rtspc->rtp_buf = scratch;
702	rtspc->rtp_bufsize = rtp_dataleft;
703
704	/* As far as the transfer is concerned, this data is consumed */
705	*nread = 0;
706	return CURLE_OK;
707	}
708	/* Fix up k->str to point just after the last RTP packet */
709	k->str += *nread - rtp_dataleft;
710
711	/* either all of the data has been read or...
712	* rtp now points at the next byte to parse
713	*/
714	if(rtp_dataleft > 0)
715	DEBUGASSERT(k->str[0] == rtp[0]);
716
717	DEBUGASSERT(rtp_dataleft <= nread); / sanity check */
718
719	*nread = rtp_dataleft;
720
721	/* If we get here, we have finished with the leftover/merge buffer */
722	Curl_safefree(rtspc->rtp_buf);
723	rtspc->rtp_buf = NULL;
724	rtspc->rtp_bufsize = 0;
725
726	return CURLE_OK;
727	}
728
729	static
730	CURLcode rtp_client_write(struct Curl_easy data, char ptr, size_t len)
731	{
732	size_t wrote;
733	curl_write_callback writeit;
734	void *user_ptr;
735
736	if(len == 0) {
737	failf(data, "Cannot write a 0 size RTP packet.");
738	return CURLE_WRITE_ERROR;
739	}
740
741	/* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
742	function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
743	data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
744	pointer to write out the RTP data. */
745	if(data->set.fwrite_rtp) {
746	writeit = data->set.fwrite_rtp;
747	user_ptr = data->set.rtp_out;
748	}
749	else {
750	writeit = data->set.fwrite_func;
751	user_ptr = data->set.out;
752	}
753
754	Curl_set_in_callback(data, true);
755	wrote = writeit(ptr, 1, len, user_ptr);
756	Curl_set_in_callback(data, false);
757
758	if(CURL_WRITEFUNC_PAUSE == wrote) {
759	failf(data, "Cannot pause RTP");
760	return CURLE_WRITE_ERROR;
761	}
762
763	if(wrote != len) {
764	failf(data, "Failed writing RTP data");
765	return CURLE_WRITE_ERROR;
766	}
767
768	return CURLE_OK;
769	}
770
771	CURLcode Curl_rtsp_parseheader(struct Curl_easy data, char header)
772	{
773	long CSeq = 0;
774
775	if(checkprefix("CSeq:", header)) {
776	/* Store the received CSeq. Match is verified in rtsp_done */
777	int nc = sscanf(&header[4], ": %ld", &CSeq);
778	if(nc == 1) {
779	struct RTSP *rtsp = data->req.p.rtsp;
780	rtsp->CSeq_recv = CSeq; /* mark the request */
781	data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
782	}
783	else {
784	failf(data, "Unable to read the CSeq header: [%s]", header);
785	return CURLE_RTSP_CSEQ_ERROR;
786	}
787	}
788	else if(checkprefix("Session:", header)) {
789	char *start;
790	char *end;
791	size_t idlen;
792
793	/* Find the first non-space letter */
794	start = header + 8;
795	while(start && ISSPACE(start))
796	start++;
797
798	if(!*start) {
799	failf(data, "Got a blank Session ID");
800	return CURLE_RTSP_SESSION_ERROR;
801	}
802
803	/* Find the end of Session ID
804	*
805	* Allow any non whitespace content, up to the field separator or end of
806	* line. RFC 2326 isn't 100% clear on the session ID and for example
807	* gstreamer does url-encoded session ID's not covered by the standard.
808	*/
809	end = start;
810	while(end && end != ';' && !ISSPACE(*end))
811	end++;
812	idlen = end - start;
813
814	if(data->set.str[STRING_RTSP_SESSION_ID]) {
815
816	/* If the Session ID is set, then compare */
817	if(strlen(data->set.str[STRING_RTSP_SESSION_ID]) != idlen \|\|
818	strncmp(start, data->set.str[STRING_RTSP_SESSION_ID], idlen) != 0) {
819	failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
820	start, data->set.str[STRING_RTSP_SESSION_ID]);
821	return CURLE_RTSP_SESSION_ERROR;
822	}
823	}
824	else {
825	/* If the Session ID is not set, and we find it in a response, then set
826	* it.
827	*/
828
829	/* Copy the id substring into a new buffer */
830	data->set.str[STRING_RTSP_SESSION_ID] = malloc(idlen + 1);
831	if(!data->set.str[STRING_RTSP_SESSION_ID])
832	return CURLE_OUT_OF_MEMORY;
833	memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, idlen);
834	(data->set.str[STRING_RTSP_SESSION_ID])[idlen] = '\0';
835	}
836	}
837	return CURLE_OK;
838	}
839
840	#endif /* CURL_DISABLE_RTSP or using Hyper */

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source: vbox/trunk/src/libs/curl-7.83.1/lib/rtsp.c@ 98341

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