rtsp.c@ 98334

Last change on this file since 98334 was 98326, checked in by vboxsync, 2 years ago
curl-7.87.0: Applied and adjusted our curl changes to 7.83.1. bugref:10356
Property svn:eol-style set to `native`
File size: 26.0 KB

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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	* SPDX-License-Identifier: curl
22	*
23	***************************************************************************/
24
25	#include "curl_setup.h"
26
27	#if !defined(CURL_DISABLE_RTSP) && !defined(USE_HYPER)
28
29	#include "urldata.h"
30	#include <curl/curl.h>
31	#include "transfer.h"
32	#include "sendf.h"
33	#include "multiif.h"
34	#include "http.h"
35	#include "url.h"
36	#include "progress.h"
37	#include "rtsp.h"
38	#include "strcase.h"
39	#include "select.h"
40	#include "connect.h"
41	#include "strdup.h"
42	/* The last 3 #include files should be in this order */
43	#include "curl_printf.h"
44	#include "curl_memory.h"
45	#include "memdebug.h"
46
47	#define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1])))
48
49	#define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) \| \
50	((int)((unsigned char)((p)[3]))))
51
52	/* protocol-specific functions set up to be called by the main engine */
53	static CURLcode rtsp_do(struct Curl_easy data, bool done);
54	static CURLcode rtsp_done(struct Curl_easy *data, CURLcode, bool premature);
55	static CURLcode rtsp_connect(struct Curl_easy data, bool done);
56	static CURLcode rtsp_disconnect(struct Curl_easy *data,
57	struct connectdata *conn, bool dead);
58	static int rtsp_getsock_do(struct Curl_easy *data,
59	struct connectdata conn, curl_socket_t socks);
60
61	/*
62	* Parse and write out any available RTP data.
63	*
64	* nread: amount of data left after k->str. will be modified if RTP
65	* data is parsed and k->str is moved up
66	* readmore: whether or not the RTP parser needs more data right away
67	*/
68	static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
69	struct connectdata *conn,
70	ssize_t *nread,
71	bool *readmore);
72
73	static CURLcode rtsp_setup_connection(struct Curl_easy *data,
74	struct connectdata *conn);
75	static unsigned int rtsp_conncheck(struct Curl_easy *data,
76	struct connectdata *check,
77	unsigned int checks_to_perform);
78
79	/* this returns the socket to wait for in the DO and DOING state for the multi
80	interface and then we're always _sending_ a request and thus we wait for
81	the single socket to become writable only */
82	static int rtsp_getsock_do(struct Curl_easy data, struct connectdata conn,
83	curl_socket_t *socks)
84	{
85	/* write mode */
86	(void)data;
87	socks[0] = conn->sock[FIRSTSOCKET];
88	return GETSOCK_WRITESOCK(0);
89	}
90
91	static
92	CURLcode rtp_client_write(struct Curl_easy data, char ptr, size_t len);
93
94
95	/*
96	* RTSP handler interface.
97	*/
98	const struct Curl_handler Curl_handler_rtsp = {
99	"RTSP", /* scheme */
100	rtsp_setup_connection, /* setup_connection */
101	rtsp_do, /* do_it */
102	rtsp_done, /* done */
103	ZERO_NULL, /* do_more */
104	rtsp_connect, /* connect_it */
105	ZERO_NULL, /* connecting */
106	ZERO_NULL, /* doing */
107	ZERO_NULL, /* proto_getsock */
108	rtsp_getsock_do, /* doing_getsock */
109	ZERO_NULL, /* domore_getsock */
110	ZERO_NULL, /* perform_getsock */
111	rtsp_disconnect, /* disconnect */
112	rtsp_rtp_readwrite, /* readwrite */
113	rtsp_conncheck, /* connection_check */
114	ZERO_NULL, /* attach connection */
115	PORT_RTSP, /* defport */
116	CURLPROTO_RTSP, /* protocol */
117	CURLPROTO_RTSP, /* family */
118	PROTOPT_NONE /* flags */
119	};
120
121
122	static CURLcode rtsp_setup_connection(struct Curl_easy *data,
123	struct connectdata *conn)
124	{
125	struct RTSP *rtsp;
126	(void)conn;
127
128	data->req.p.rtsp = rtsp = calloc(1, sizeof(struct RTSP));
129	if(!rtsp)
130	return CURLE_OUT_OF_MEMORY;
131
132	return CURLE_OK;
133	}
134
135
136	/*
137	* The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not
138	* want to block the application forever while receiving a stream. Therefore,
139	* we cannot assume that an RTSP socket is dead just because it is readable.
140	*
141	* Instead, if it is readable, run Curl_connalive() to peek at the socket
142	* and distinguish between closed and data.
143	*/
144	static bool rtsp_connisdead(struct Curl_easy data, struct connectdata check)
145	{
146	int sval;
147	bool ret_val = TRUE;
148
149	sval = SOCKET_READABLE(check->sock[FIRSTSOCKET], 0);
150	if(sval == 0) {
151	/* timeout */
152	ret_val = FALSE;
153	}
154	else if(sval & CURL_CSELECT_ERR) {
155	/* socket is in an error state */
156	ret_val = TRUE;
157	}
158	else if(sval & CURL_CSELECT_IN) {
159	/* readable with no error. could still be closed */
160	ret_val = !Curl_connalive(data, check);
161	}
162
163	return ret_val;
164	}
165
166	/*
167	* Function to check on various aspects of a connection.
168	*/
169	static unsigned int rtsp_conncheck(struct Curl_easy *data,
170	struct connectdata *conn,
171	unsigned int checks_to_perform)
172	{
173	unsigned int ret_val = CONNRESULT_NONE;
174	(void)data;
175
176	if(checks_to_perform & CONNCHECK_ISDEAD) {
177	if(rtsp_connisdead(data, conn))
178	ret_val \|= CONNRESULT_DEAD;
179	}
180
181	return ret_val;
182	}
183
184
185	static CURLcode rtsp_connect(struct Curl_easy data, bool done)
186	{
187	CURLcode httpStatus;
188
189	httpStatus = Curl_http_connect(data, done);
190
191	/* Initialize the CSeq if not already done */
192	if(data->state.rtsp_next_client_CSeq == 0)
193	data->state.rtsp_next_client_CSeq = 1;
194	if(data->state.rtsp_next_server_CSeq == 0)
195	data->state.rtsp_next_server_CSeq = 1;
196
197	data->conn->proto.rtspc.rtp_channel = -1;
198
199	return httpStatus;
200	}
201
202	static CURLcode rtsp_disconnect(struct Curl_easy *data,
203	struct connectdata *conn, bool dead)
204	{
205	(void) dead;
206	(void) data;
207	Curl_safefree(conn->proto.rtspc.rtp_buf);
208	return CURLE_OK;
209	}
210
211
212	static CURLcode rtsp_done(struct Curl_easy *data,
213	CURLcode status, bool premature)
214	{
215	struct RTSP *rtsp = data->req.p.rtsp;
216	CURLcode httpStatus;
217
218	/* Bypass HTTP empty-reply checks on receive */
219	if(data->set.rtspreq == RTSPREQ_RECEIVE)
220	premature = TRUE;
221
222	httpStatus = Curl_http_done(data, status, premature);
223
224	if(rtsp && !status && !httpStatus) {
225	/* Check the sequence numbers */
226	long CSeq_sent = rtsp->CSeq_sent;
227	long CSeq_recv = rtsp->CSeq_recv;
228	if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
229	failf(data,
230	"The CSeq of this request %ld did not match the response %ld",
231	CSeq_sent, CSeq_recv);
232	return CURLE_RTSP_CSEQ_ERROR;
233	}
234	if(data->set.rtspreq == RTSPREQ_RECEIVE &&
235	(data->conn->proto.rtspc.rtp_channel == -1)) {
236	infof(data, "Got an RTP Receive with a CSeq of %ld", CSeq_recv);
237	}
238	}
239
240	return httpStatus;
241	}
242
243	static CURLcode rtsp_do(struct Curl_easy data, bool done)
244	{
245	struct connectdata *conn = data->conn;
246	CURLcode result = CURLE_OK;
247	Curl_RtspReq rtspreq = data->set.rtspreq;
248	struct RTSP *rtsp = data->req.p.rtsp;
249	struct dynbuf req_buffer;
250	curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
251	curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
252
253	const char *p_request = NULL;
254	const char *p_session_id = NULL;
255	const char *p_accept = NULL;
256	const char *p_accept_encoding = NULL;
257	const char *p_range = NULL;
258	const char *p_referrer = NULL;
259	const char *p_stream_uri = NULL;
260	const char *p_transport = NULL;
261	const char *p_uagent = NULL;
262	const char *p_proxyuserpwd = NULL;
263	const char *p_userpwd = NULL;
264
265	*done = TRUE;
266
267	rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
268	rtsp->CSeq_recv = 0;
269
270	/* Setup the first_* fields to allow auth details get sent
271	to this origin */
272
273	if(!data->state.first_host) {
274	data->state.first_host = strdup(conn->host.name);
275	if(!data->state.first_host)
276	return CURLE_OUT_OF_MEMORY;
277
278	data->state.first_remote_port = conn->remote_port;
279	data->state.first_remote_protocol = conn->handler->protocol;
280	}
281
282	/* Setup the 'p_request' pointer to the proper p_request string
283	* Since all RTSP requests are included here, there is no need to
284	* support custom requests like HTTP.
285	**/
286	data->req.no_body = TRUE; /* most requests don't contain a body */
287	switch(rtspreq) {
288	default:
289	failf(data, "Got invalid RTSP request");
290	return CURLE_BAD_FUNCTION_ARGUMENT;
291	case RTSPREQ_OPTIONS:
292	p_request = "OPTIONS";
293	break;
294	case RTSPREQ_DESCRIBE:
295	p_request = "DESCRIBE";
296	data->req.no_body = FALSE;
297	break;
298	case RTSPREQ_ANNOUNCE:
299	p_request = "ANNOUNCE";
300	break;
301	case RTSPREQ_SETUP:
302	p_request = "SETUP";
303	break;
304	case RTSPREQ_PLAY:
305	p_request = "PLAY";
306	break;
307	case RTSPREQ_PAUSE:
308	p_request = "PAUSE";
309	break;
310	case RTSPREQ_TEARDOWN:
311	p_request = "TEARDOWN";
312	break;
313	case RTSPREQ_GET_PARAMETER:
314	/* GET_PARAMETER's no_body status is determined later */
315	p_request = "GET_PARAMETER";
316	data->req.no_body = FALSE;
317	break;
318	case RTSPREQ_SET_PARAMETER:
319	p_request = "SET_PARAMETER";
320	break;
321	case RTSPREQ_RECORD:
322	p_request = "RECORD";
323	break;
324	case RTSPREQ_RECEIVE:
325	p_request = "";
326	/* Treat interleaved RTP as body */
327	data->req.no_body = FALSE;
328	break;
329	case RTSPREQ_LAST:
330	failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
331	return CURLE_BAD_FUNCTION_ARGUMENT;
332	}
333
334	if(rtspreq == RTSPREQ_RECEIVE) {
335	Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, -1);
336
337	return result;
338	}
339
340	p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
341	if(!p_session_id &&
342	(rtspreq & ~(RTSPREQ_OPTIONS \| RTSPREQ_DESCRIBE \| RTSPREQ_SETUP))) {
343	failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
344	p_request);
345	return CURLE_BAD_FUNCTION_ARGUMENT;
346	}
347
348	/* Stream URI. Default to server '' if not specified /
349	if(data->set.str[STRING_RTSP_STREAM_URI]) {
350	p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
351	}
352	else {
353	p_stream_uri = "*";
354	}
355
356	/* Transport Header for SETUP requests */
357	p_transport = Curl_checkheaders(data, STRCONST("Transport"));
358	if(rtspreq == RTSPREQ_SETUP && !p_transport) {
359	/* New Transport: setting? */
360	if(data->set.str[STRING_RTSP_TRANSPORT]) {
361	Curl_safefree(data->state.aptr.rtsp_transport);
362
363	data->state.aptr.rtsp_transport =
364	aprintf("Transport: %s\r\n",
365	data->set.str[STRING_RTSP_TRANSPORT]);
366	if(!data->state.aptr.rtsp_transport)
367	return CURLE_OUT_OF_MEMORY;
368	}
369	else {
370	failf(data,
371	"Refusing to issue an RTSP SETUP without a Transport: header.");
372	return CURLE_BAD_FUNCTION_ARGUMENT;
373	}
374
375	p_transport = data->state.aptr.rtsp_transport;
376	}
377
378	/* Accept Headers for DESCRIBE requests */
379	if(rtspreq == RTSPREQ_DESCRIBE) {
380	/* Accept Header */
381	p_accept = Curl_checkheaders(data, STRCONST("Accept"))?
382	NULL:"Accept: application/sdp\r\n";
383
384	/* Accept-Encoding header */
385	if(!Curl_checkheaders(data, STRCONST("Accept-Encoding")) &&
386	data->set.str[STRING_ENCODING]) {
387	Curl_safefree(data->state.aptr.accept_encoding);
388	data->state.aptr.accept_encoding =
389	aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
390
391	if(!data->state.aptr.accept_encoding)
392	return CURLE_OUT_OF_MEMORY;
393
394	p_accept_encoding = data->state.aptr.accept_encoding;
395	}
396	}
397
398	/* The User-Agent string might have been allocated in url.c already, because
399	it might have been used in the proxy connect, but if we have got a header
400	with the user-agent string specified, we erase the previously made string
401	here. */
402	if(Curl_checkheaders(data, STRCONST("User-Agent")) &&
403	data->state.aptr.uagent) {
404	Curl_safefree(data->state.aptr.uagent);
405	data->state.aptr.uagent = NULL;
406	}
407	else if(!Curl_checkheaders(data, STRCONST("User-Agent")) &&
408	data->set.str[STRING_USERAGENT]) {
409	p_uagent = data->state.aptr.uagent;
410	}
411
412	/* setup the authentication headers */
413	result = Curl_http_output_auth(data, conn, p_request, HTTPREQ_GET,
414	p_stream_uri, FALSE);
415	if(result)
416	return result;
417
418	p_proxyuserpwd = data->state.aptr.proxyuserpwd;
419	p_userpwd = data->state.aptr.userpwd;
420
421	/* Referrer */
422	Curl_safefree(data->state.aptr.ref);
423	if(data->state.referer && !Curl_checkheaders(data, STRCONST("Referer")))
424	data->state.aptr.ref = aprintf("Referer: %s\r\n", data->state.referer);
425	else
426	data->state.aptr.ref = NULL;
427
428	p_referrer = data->state.aptr.ref;
429
430	/*
431	* Range Header
432	* Only applies to PLAY, PAUSE, RECORD
433	*
434	* Go ahead and use the Range stuff supplied for HTTP
435	*/
436	if(data->state.use_range &&
437	(rtspreq & (RTSPREQ_PLAY \| RTSPREQ_PAUSE \| RTSPREQ_RECORD))) {
438
439	/* Check to see if there is a range set in the custom headers */
440	if(!Curl_checkheaders(data, STRCONST("Range")) && data->state.range) {
441	Curl_safefree(data->state.aptr.rangeline);
442	data->state.aptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
443	p_range = data->state.aptr.rangeline;
444	}
445	}
446
447	/*
448	* Sanity check the custom headers
449	*/
450	if(Curl_checkheaders(data, STRCONST("CSeq"))) {
451	failf(data, "CSeq cannot be set as a custom header.");
452	return CURLE_RTSP_CSEQ_ERROR;
453	}
454	if(Curl_checkheaders(data, STRCONST("Session"))) {
455	failf(data, "Session ID cannot be set as a custom header.");
456	return CURLE_BAD_FUNCTION_ARGUMENT;
457	}
458
459	/* Initialize a dynamic send buffer */
460	Curl_dyn_init(&req_buffer, DYN_RTSP_REQ_HEADER);
461
462	result =
463	Curl_dyn_addf(&req_buffer,
464	"%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
465	"CSeq: %ld\r\n", /* CSeq */
466	p_request, p_stream_uri, rtsp->CSeq_sent);
467	if(result)
468	return result;
469
470	/*
471	* Rather than do a normal alloc line, keep the session_id unformatted
472	* to make comparison easier
473	*/
474	if(p_session_id) {
475	result = Curl_dyn_addf(&req_buffer, "Session: %s\r\n", p_session_id);
476	if(result)
477	return result;
478	}
479
480	/*
481	* Shared HTTP-like options
482	*/
483	result = Curl_dyn_addf(&req_buffer,
484	"%s" /* transport */
485	"%s" /* accept */
486	"%s" /* accept-encoding */
487	"%s" /* range */
488	"%s" /* referrer */
489	"%s" /* user-agent */
490	"%s" /* proxyuserpwd */
491	"%s" /* userpwd */
492	,
493	p_transport ? p_transport : "",
494	p_accept ? p_accept : "",
495	p_accept_encoding ? p_accept_encoding : "",
496	p_range ? p_range : "",
497	p_referrer ? p_referrer : "",
498	p_uagent ? p_uagent : "",
499	p_proxyuserpwd ? p_proxyuserpwd : "",
500	p_userpwd ? p_userpwd : "");
501
502	/*
503	* Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
504	* with basic and digest, it will be freed anyway by the next request
505	*/
506	Curl_safefree(data->state.aptr.userpwd);
507	data->state.aptr.userpwd = NULL;
508
509	if(result)
510	return result;
511
512	if((rtspreq == RTSPREQ_SETUP) \|\| (rtspreq == RTSPREQ_DESCRIBE)) {
513	result = Curl_add_timecondition(data, &req_buffer);
514	if(result)
515	return result;
516	}
517
518	result = Curl_add_custom_headers(data, FALSE, &req_buffer);
519	if(result)
520	return result;
521
522	if(rtspreq == RTSPREQ_ANNOUNCE \|\|
523	rtspreq == RTSPREQ_SET_PARAMETER \|\|
524	rtspreq == RTSPREQ_GET_PARAMETER) {
525
526	if(data->set.upload) {
527	putsize = data->state.infilesize;
528	data->state.httpreq = HTTPREQ_PUT;
529
530	}
531	else {
532	postsize = (data->state.infilesize != -1)?
533	data->state.infilesize:
534	(data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
535	data->state.httpreq = HTTPREQ_POST;
536	}
537
538	if(putsize > 0 \|\| postsize > 0) {
539	/* As stated in the http comments, it is probably not wise to
540	* actually set a custom Content-Length in the headers */
541	if(!Curl_checkheaders(data, STRCONST("Content-Length"))) {
542	result =
543	Curl_dyn_addf(&req_buffer,
544	"Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
545	(data->set.upload ? putsize : postsize));
546	if(result)
547	return result;
548	}
549
550	if(rtspreq == RTSPREQ_SET_PARAMETER \|\|
551	rtspreq == RTSPREQ_GET_PARAMETER) {
552	if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
553	result = Curl_dyn_addn(&req_buffer,
554	STRCONST("Content-Type: "
555	"text/parameters\r\n"));
556	if(result)
557	return result;
558	}
559	}
560
561	if(rtspreq == RTSPREQ_ANNOUNCE) {
562	if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
563	result = Curl_dyn_addn(&req_buffer,
564	STRCONST("Content-Type: "
565	"application/sdp\r\n"));
566	if(result)
567	return result;
568	}
569	}
570
571	data->state.expect100header = FALSE; /* RTSP posts are simple/small */
572	}
573	else if(rtspreq == RTSPREQ_GET_PARAMETER) {
574	/* Check for an empty GET_PARAMETER (heartbeat) request */
575	data->state.httpreq = HTTPREQ_HEAD;
576	data->req.no_body = TRUE;
577	}
578	}
579
580	/* RTSP never allows chunked transfer */
581	data->req.forbidchunk = TRUE;
582	/* Finish the request buffer */
583	result = Curl_dyn_addn(&req_buffer, STRCONST("\r\n"));
584	if(result)
585	return result;
586
587	if(postsize > 0) {
588	result = Curl_dyn_addn(&req_buffer, data->set.postfields,
589	(size_t)postsize);
590	if(result)
591	return result;
592	}
593
594	/* issue the request */
595	result = Curl_buffer_send(&req_buffer, data,
596	&data->info.request_size, 0, FIRSTSOCKET);
597	if(result) {
598	failf(data, "Failed sending RTSP request");
599	return result;
600	}
601
602	Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, putsize?FIRSTSOCKET:-1);
603
604	/* Increment the CSeq on success */
605	data->state.rtsp_next_client_CSeq++;
606
607	if(data->req.writebytecount) {
608	/* if a request-body has been sent off, we make sure this progress is
609	noted properly */
610	Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
611	if(Curl_pgrsUpdate(data))
612	result = CURLE_ABORTED_BY_CALLBACK;
613	}
614
615	return result;
616	}
617
618
619	static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
620	struct connectdata *conn,
621	ssize_t *nread,
622	bool *readmore) {
623	struct SingleRequest *k = &data->req;
624	struct rtsp_conn *rtspc = &(conn->proto.rtspc);
625
626	char rtp; / moving pointer to rtp data */
627	ssize_t rtp_dataleft; /* how much data left to parse in this round */
628	char *scratch;
629	CURLcode result;
630
631	if(rtspc->rtp_buf) {
632	/* There was some leftover data the last time. Merge buffers */
633	char *newptr = Curl_saferealloc(rtspc->rtp_buf,
634	rtspc->rtp_bufsize + *nread);
635	if(!newptr) {
636	rtspc->rtp_buf = NULL;
637	rtspc->rtp_bufsize = 0;
638	return CURLE_OUT_OF_MEMORY;
639	}
640	rtspc->rtp_buf = newptr;
641	memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
642	rtspc->rtp_bufsize += *nread;
643	rtp = rtspc->rtp_buf;
644	rtp_dataleft = rtspc->rtp_bufsize;
645	}
646	else {
647	/* Just parse the request buffer directly */
648	rtp = k->str;
649	rtp_dataleft = *nread;
650	}
651
652	while((rtp_dataleft > 0) &&
653	(rtp[0] == '$')) {
654	if(rtp_dataleft > 4) {
655	int rtp_length;
656
657	/* Parse the header */
658	/* The channel identifier immediately follows and is 1 byte */
659	rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
660
661	/* The length is two bytes */
662	rtp_length = RTP_PKT_LENGTH(rtp);
663
664	if(rtp_dataleft < rtp_length + 4) {
665	/* Need more - incomplete payload */
666	*readmore = TRUE;
667	break;
668	}
669	/* We have the full RTP interleaved packet
670	* Write out the header including the leading '$' */
671	DEBUGF(infof(data, "RTP write channel %d rtp_length %d",
672	rtspc->rtp_channel, rtp_length));
673	result = rtp_client_write(data, &rtp[0], rtp_length + 4);
674	if(result) {
675	failf(data, "Got an error writing an RTP packet");
676	*readmore = FALSE;
677	Curl_safefree(rtspc->rtp_buf);
678	rtspc->rtp_buf = NULL;
679	rtspc->rtp_bufsize = 0;
680	return result;
681	}
682
683	/* Move forward in the buffer */
684	rtp_dataleft -= rtp_length + 4;
685	rtp += rtp_length + 4;
686
687	if(data->set.rtspreq == RTSPREQ_RECEIVE) {
688	/* If we are in a passive receive, give control back
689	* to the app as often as we can.
690	*/
691	k->keepon &= ~KEEP_RECV;
692	}
693	}
694	else {
695	/* Need more - incomplete header */
696	*readmore = TRUE;
697	break;
698	}
699	}
700
701	if(rtp_dataleft && rtp[0] == '$') {
702	DEBUGF(infof(data, "RTP Rewinding %zd %s", rtp_dataleft,
703	*readmore ? "(READMORE)" : ""));
704
705	/* Store the incomplete RTP packet for a "rewind" */
706	scratch = malloc(rtp_dataleft);
707	if(!scratch) {
708	Curl_safefree(rtspc->rtp_buf);
709	rtspc->rtp_buf = NULL;
710	rtspc->rtp_bufsize = 0;
711	return CURLE_OUT_OF_MEMORY;
712	}
713	memcpy(scratch, rtp, rtp_dataleft);
714	Curl_safefree(rtspc->rtp_buf);
715	rtspc->rtp_buf = scratch;
716	rtspc->rtp_bufsize = rtp_dataleft;
717
718	/* As far as the transfer is concerned, this data is consumed */
719	*nread = 0;
720	return CURLE_OK;
721	}
722	/* Fix up k->str to point just after the last RTP packet */
723	k->str += *nread - rtp_dataleft;
724
725	/* either all of the data has been read or...
726	* rtp now points at the next byte to parse
727	*/
728	if(rtp_dataleft > 0)
729	DEBUGASSERT(k->str[0] == rtp[0]);
730
731	DEBUGASSERT(rtp_dataleft <= nread); / sanity check */
732
733	*nread = rtp_dataleft;
734
735	/* If we get here, we have finished with the leftover/merge buffer */
736	Curl_safefree(rtspc->rtp_buf);
737	rtspc->rtp_buf = NULL;
738	rtspc->rtp_bufsize = 0;
739
740	return CURLE_OK;
741	}
742
743	static
744	CURLcode rtp_client_write(struct Curl_easy data, char ptr, size_t len)
745	{
746	size_t wrote;
747	curl_write_callback writeit;
748	void *user_ptr;
749
750	if(len == 0) {
751	failf(data, "Cannot write a 0 size RTP packet.");
752	return CURLE_WRITE_ERROR;
753	}
754
755	/* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
756	function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
757	data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
758	pointer to write out the RTP data. */
759	if(data->set.fwrite_rtp) {
760	writeit = data->set.fwrite_rtp;
761	user_ptr = data->set.rtp_out;
762	}
763	else {
764	writeit = data->set.fwrite_func;
765	user_ptr = data->set.out;
766	}
767
768	Curl_set_in_callback(data, true);
769	wrote = writeit(ptr, 1, len, user_ptr);
770	Curl_set_in_callback(data, false);
771
772	if(CURL_WRITEFUNC_PAUSE == wrote) {
773	failf(data, "Cannot pause RTP");
774	return CURLE_WRITE_ERROR;
775	}
776
777	if(wrote != len) {
778	failf(data, "Failed writing RTP data");
779	return CURLE_WRITE_ERROR;
780	}
781
782	return CURLE_OK;
783	}
784
785	CURLcode Curl_rtsp_parseheader(struct Curl_easy data, char header)
786	{
787	long CSeq = 0;
788
789	if(checkprefix("CSeq:", header)) {
790	/* Store the received CSeq. Match is verified in rtsp_done */
791	int nc = sscanf(&header[4], ": %ld", &CSeq);
792	if(nc == 1) {
793	struct RTSP *rtsp = data->req.p.rtsp;
794	rtsp->CSeq_recv = CSeq; /* mark the request */
795	data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
796	}
797	else {
798	failf(data, "Unable to read the CSeq header: [%s]", header);
799	return CURLE_RTSP_CSEQ_ERROR;
800	}
801	}
802	else if(checkprefix("Session:", header)) {
803	char *start;
804	char *end;
805	size_t idlen;
806
807	/* Find the first non-space letter */
808	start = header + 8;
809	while(start && ISBLANK(start))
810	start++;
811
812	if(!*start) {
813	failf(data, "Got a blank Session ID");
814	return CURLE_RTSP_SESSION_ERROR;
815	}
816
817	/* Find the end of Session ID
818	*
819	* Allow any non whitespace content, up to the field separator or end of
820	* line. RFC 2326 isn't 100% clear on the session ID and for example
821	* gstreamer does url-encoded session ID's not covered by the standard.
822	*/
823	end = start;
824	while(end && end != ';' && !ISSPACE(*end))
825	end++;
826	idlen = end - start;
827
828	if(data->set.str[STRING_RTSP_SESSION_ID]) {
829
830	/* If the Session ID is set, then compare */
831	if(strlen(data->set.str[STRING_RTSP_SESSION_ID]) != idlen \|\|
832	strncmp(start, data->set.str[STRING_RTSP_SESSION_ID], idlen) != 0) {
833	failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
834	start, data->set.str[STRING_RTSP_SESSION_ID]);
835	return CURLE_RTSP_SESSION_ERROR;
836	}
837	}
838	else {
839	/* If the Session ID is not set, and we find it in a response, then set
840	* it.
841	*/
842
843	/* Copy the id substring into a new buffer */
844	data->set.str[STRING_RTSP_SESSION_ID] = malloc(idlen + 1);
845	if(!data->set.str[STRING_RTSP_SESSION_ID])
846	return CURLE_OUT_OF_MEMORY;
847	memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, idlen);
848	(data->set.str[STRING_RTSP_SESSION_ID])[idlen] = '\0';
849	}
850	}
851	return CURLE_OK;
852	}
853
854	#endif /* CURL_DISABLE_RTSP or using Hyper */

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source: vbox/trunk/src/libs/curl-7.87.0/lib/rtsp.c@ 98334

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