rtsp.c@ 94601

Last change on this file since 94601 was 85671, checked in by vboxsync, 4 years ago
Export out internal curl copy to make it a lot simpler to build VBox (OSE) on Windows. bugref:9814
Property svn:eol-style set to `native`
File size: 25.6 KB

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1	/***************************************************************************
2	* _ _ ____ _
3	* Project ___\| \| \| \| _ \\| \|
4	* / __\| \| \| \| \|_) \| \|
5	* \| (__\| \|_\| \| _ <\| \|___
6	* \___\|\___/\|_\| \_\_____\|
7	*
8	* Copyright (C) 1998 - 2018, 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.haxx.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	#ifndef CURL_DISABLE_RTSP
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	/*
46	* TODO (general)
47	* -incoming server requests
48	* -server CSeq counter
49	* -digest authentication
50	* -connect through proxy
51	* -pipelining?
52	*/
53
54
55	#define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1])))
56
57	#define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) \| \
58	((int)((unsigned char)((p)[3]))))
59
60	/* protocol-specific functions set up to be called by the main engine */
61	static CURLcode rtsp_do(struct connectdata conn, bool done);
62	static CURLcode rtsp_done(struct connectdata *conn, CURLcode, bool premature);
63	static CURLcode rtsp_connect(struct connectdata conn, bool done);
64	static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead);
65
66	static int rtsp_getsock_do(struct connectdata *conn,
67	curl_socket_t *socks,
68	int numsocks);
69
70	/*
71	* Parse and write out any available RTP data.
72	*
73	* nread: amount of data left after k->str. will be modified if RTP
74	* data is parsed and k->str is moved up
75	* readmore: whether or not the RTP parser needs more data right away
76	*/
77	static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
78	struct connectdata *conn,
79	ssize_t *nread,
80	bool *readmore);
81
82	static CURLcode rtsp_setup_connection(struct connectdata *conn);
83
84	bool rtsp_connisdead(struct connectdata *check);
85	static unsigned int rtsp_conncheck(struct connectdata *check,
86	unsigned int checks_to_perform);
87
88	/* this returns the socket to wait for in the DO and DOING state for the multi
89	interface and then we're always _sending_ a request and thus we wait for
90	the single socket to become writable only */
91	static int rtsp_getsock_do(struct connectdata *conn,
92	curl_socket_t *socks,
93	int numsocks)
94	{
95	/* write mode */
96	(void)numsocks; /* unused, we trust it to be at least 1 */
97	socks[0] = conn->sock[FIRSTSOCKET];
98	return GETSOCK_WRITESOCK(0);
99	}
100
101	static
102	CURLcode rtp_client_write(struct connectdata conn, char ptr, size_t len);
103
104
105	/*
106	* RTSP handler interface.
107	*/
108	const struct Curl_handler Curl_handler_rtsp = {
109	"RTSP", /* scheme */
110	rtsp_setup_connection, /* setup_connection */
111	rtsp_do, /* do_it */
112	rtsp_done, /* done */
113	ZERO_NULL, /* do_more */
114	rtsp_connect, /* connect_it */
115	ZERO_NULL, /* connecting */
116	ZERO_NULL, /* doing */
117	ZERO_NULL, /* proto_getsock */
118	rtsp_getsock_do, /* doing_getsock */
119	ZERO_NULL, /* domore_getsock */
120	ZERO_NULL, /* perform_getsock */
121	rtsp_disconnect, /* disconnect */
122	rtsp_rtp_readwrite, /* readwrite */
123	rtsp_conncheck, /* connection_check */
124	PORT_RTSP, /* defport */
125	CURLPROTO_RTSP, /* protocol */
126	PROTOPT_NONE /* flags */
127	};
128
129
130	static CURLcode rtsp_setup_connection(struct connectdata *conn)
131	{
132	struct RTSP *rtsp;
133
134	conn->data->req.protop = rtsp = calloc(1, sizeof(struct RTSP));
135	if(!rtsp)
136	return CURLE_OUT_OF_MEMORY;
137
138	return CURLE_OK;
139	}
140
141
142	/*
143	* The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not
144	* want to block the application forever while receiving a stream. Therefore,
145	* we cannot assume that an RTSP socket is dead just because it is readable.
146	*
147	* Instead, if it is readable, run Curl_connalive() to peek at the socket
148	* and distinguish between closed and data.
149	*/
150	bool rtsp_connisdead(struct connectdata *check)
151	{
152	int sval;
153	bool ret_val = TRUE;
154
155	sval = SOCKET_READABLE(check->sock[FIRSTSOCKET], 0);
156	if(sval == 0) {
157	/* timeout */
158	ret_val = FALSE;
159	}
160	else if(sval & CURL_CSELECT_ERR) {
161	/* socket is in an error state */
162	ret_val = TRUE;
163	}
164	else if(sval & CURL_CSELECT_IN) {
165	/* readable with no error. could still be closed */
166	ret_val = !Curl_connalive(check);
167	}
168
169	return ret_val;
170	}
171
172	/*
173	* Function to check on various aspects of a connection.
174	*/
175	static unsigned int rtsp_conncheck(struct connectdata *check,
176	unsigned int checks_to_perform)
177	{
178	unsigned int ret_val = CONNRESULT_NONE;
179
180	if(checks_to_perform & CONNCHECK_ISDEAD) {
181	if(rtsp_connisdead(check))
182	ret_val \|= CONNRESULT_DEAD;
183	}
184
185	return ret_val;
186	}
187
188
189	static CURLcode rtsp_connect(struct connectdata conn, bool done)
190	{
191	CURLcode httpStatus;
192	struct Curl_easy *data = conn->data;
193
194	httpStatus = Curl_http_connect(conn, done);
195
196	/* Initialize the CSeq if not already done */
197	if(data->state.rtsp_next_client_CSeq == 0)
198	data->state.rtsp_next_client_CSeq = 1;
199	if(data->state.rtsp_next_server_CSeq == 0)
200	data->state.rtsp_next_server_CSeq = 1;
201
202	conn->proto.rtspc.rtp_channel = -1;
203
204	return httpStatus;
205	}
206
207	static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead)
208	{
209	(void) dead;
210	Curl_safefree(conn->proto.rtspc.rtp_buf);
211	return CURLE_OK;
212	}
213
214
215	static CURLcode rtsp_done(struct connectdata *conn,
216	CURLcode status, bool premature)
217	{
218	struct Curl_easy *data = conn->data;
219	struct RTSP *rtsp = data->req.protop;
220	CURLcode httpStatus;
221
222	/* Bypass HTTP empty-reply checks on receive */
223	if(data->set.rtspreq == RTSPREQ_RECEIVE)
224	premature = TRUE;
225
226	httpStatus = Curl_http_done(conn, status, premature);
227
228	if(rtsp) {
229	/* Check the sequence numbers */
230	long CSeq_sent = rtsp->CSeq_sent;
231	long CSeq_recv = rtsp->CSeq_recv;
232	if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
233	failf(data,
234	"The CSeq of this request %ld did not match the response %ld",
235	CSeq_sent, CSeq_recv);
236	return CURLE_RTSP_CSEQ_ERROR;
237	}
238	if(data->set.rtspreq == RTSPREQ_RECEIVE &&
239	(conn->proto.rtspc.rtp_channel == -1)) {
240	infof(data, "Got an RTP Receive with a CSeq of %ld\n", CSeq_recv);
241	/* TODO CPC: Server -> Client logic here */
242	}
243	}
244
245	return httpStatus;
246	}
247
248	static CURLcode rtsp_do(struct connectdata conn, bool done)
249	{
250	struct Curl_easy *data = conn->data;
251	CURLcode result = CURLE_OK;
252	Curl_RtspReq rtspreq = data->set.rtspreq;
253	struct RTSP *rtsp = data->req.protop;
254	struct HTTP *http;
255	Curl_send_buffer *req_buffer;
256	curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
257	curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
258
259	const char *p_request = NULL;
260	const char *p_session_id = NULL;
261	const char *p_accept = NULL;
262	const char *p_accept_encoding = NULL;
263	const char *p_range = NULL;
264	const char *p_referrer = NULL;
265	const char *p_stream_uri = NULL;
266	const char *p_transport = NULL;
267	const char *p_uagent = NULL;
268	const char *p_proxyuserpwd = NULL;
269	const char *p_userpwd = NULL;
270
271	*done = TRUE;
272
273	http = &(rtsp->http_wrapper);
274	/* Assert that no one has changed the RTSP struct in an evil way */
275	DEBUGASSERT((void )http == (void )rtsp);
276
277	rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
278	rtsp->CSeq_recv = 0;
279
280	/* Setup the 'p_request' pointer to the proper p_request string
281	* Since all RTSP requests are included here, there is no need to
282	* support custom requests like HTTP.
283	**/
284	data->set.opt_no_body = TRUE; /* most requests don't contain a body */
285	switch(rtspreq) {
286	default:
287	failf(data, "Got invalid RTSP request");
288	return CURLE_BAD_FUNCTION_ARGUMENT;
289	case RTSPREQ_OPTIONS:
290	p_request = "OPTIONS";
291	break;
292	case RTSPREQ_DESCRIBE:
293	p_request = "DESCRIBE";
294	data->set.opt_no_body = FALSE;
295	break;
296	case RTSPREQ_ANNOUNCE:
297	p_request = "ANNOUNCE";
298	break;
299	case RTSPREQ_SETUP:
300	p_request = "SETUP";
301	break;
302	case RTSPREQ_PLAY:
303	p_request = "PLAY";
304	break;
305	case RTSPREQ_PAUSE:
306	p_request = "PAUSE";
307	break;
308	case RTSPREQ_TEARDOWN:
309	p_request = "TEARDOWN";
310	break;
311	case RTSPREQ_GET_PARAMETER:
312	/* GET_PARAMETER's no_body status is determined later */
313	p_request = "GET_PARAMETER";
314	data->set.opt_no_body = FALSE;
315	break;
316	case RTSPREQ_SET_PARAMETER:
317	p_request = "SET_PARAMETER";
318	break;
319	case RTSPREQ_RECORD:
320	p_request = "RECORD";
321	break;
322	case RTSPREQ_RECEIVE:
323	p_request = "";
324	/* Treat interleaved RTP as body*/
325	data->set.opt_no_body = FALSE;
326	break;
327	case RTSPREQ_LAST:
328	failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
329	return CURLE_BAD_FUNCTION_ARGUMENT;
330	}
331
332	if(rtspreq == RTSPREQ_RECEIVE) {
333	Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
334	&http->readbytecount, -1, NULL);
335
336	return result;
337	}
338
339	p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
340	if(!p_session_id &&
341	(rtspreq & ~(RTSPREQ_OPTIONS \| RTSPREQ_DESCRIBE \| RTSPREQ_SETUP))) {
342	failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
343	p_request);
344	return CURLE_BAD_FUNCTION_ARGUMENT;
345	}
346
347	/* TODO: proxy? */
348
349	/* Stream URI. Default to server '' if not specified /
350	if(data->set.str[STRING_RTSP_STREAM_URI]) {
351	p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
352	}
353	else {
354	p_stream_uri = "*";
355	}
356
357	/* Transport Header for SETUP requests */
358	p_transport = Curl_checkheaders(conn, "Transport");
359	if(rtspreq == RTSPREQ_SETUP && !p_transport) {
360	/* New Transport: setting? */
361	if(data->set.str[STRING_RTSP_TRANSPORT]) {
362	Curl_safefree(conn->allocptr.rtsp_transport);
363
364	conn->allocptr.rtsp_transport =
365	aprintf("Transport: %s\r\n",
366	data->set.str[STRING_RTSP_TRANSPORT]);
367	if(!conn->allocptr.rtsp_transport)
368	return CURLE_OUT_OF_MEMORY;
369	}
370	else {
371	failf(data,
372	"Refusing to issue an RTSP SETUP without a Transport: header.");
373	return CURLE_BAD_FUNCTION_ARGUMENT;
374	}
375
376	p_transport = conn->allocptr.rtsp_transport;
377	}
378
379	/* Accept Headers for DESCRIBE requests */
380	if(rtspreq == RTSPREQ_DESCRIBE) {
381	/* Accept Header */
382	p_accept = Curl_checkheaders(conn, "Accept")?
383	NULL:"Accept: application/sdp\r\n";
384
385	/* Accept-Encoding header */
386	if(!Curl_checkheaders(conn, "Accept-Encoding") &&
387	data->set.str[STRING_ENCODING]) {
388	Curl_safefree(conn->allocptr.accept_encoding);
389	conn->allocptr.accept_encoding =
390	aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
391
392	if(!conn->allocptr.accept_encoding)
393	return CURLE_OUT_OF_MEMORY;
394
395	p_accept_encoding = conn->allocptr.accept_encoding;
396	}
397	}
398
399	/* The User-Agent string might have been allocated in url.c already, because
400	it might have been used in the proxy connect, but if we have got a header
401	with the user-agent string specified, we erase the previously made string
402	here. */
403	if(Curl_checkheaders(conn, "User-Agent") && conn->allocptr.uagent) {
404	Curl_safefree(conn->allocptr.uagent);
405	conn->allocptr.uagent = NULL;
406	}
407	else if(!Curl_checkheaders(conn, "User-Agent") &&
408	data->set.str[STRING_USERAGENT]) {
409	p_uagent = conn->allocptr.uagent;
410	}
411
412	/* setup the authentication headers */
413	result = Curl_http_output_auth(conn, p_request, p_stream_uri, FALSE);
414	if(result)
415	return result;
416
417	p_proxyuserpwd = conn->allocptr.proxyuserpwd;
418	p_userpwd = conn->allocptr.userpwd;
419
420	/* Referrer */
421	Curl_safefree(conn->allocptr.ref);
422	if(data->change.referer && !Curl_checkheaders(conn, "Referer"))
423	conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
424	else
425	conn->allocptr.ref = NULL;
426
427	p_referrer = conn->allocptr.ref;
428
429	/*
430	* Range Header
431	* Only applies to PLAY, PAUSE, RECORD
432	*
433	* Go ahead and use the Range stuff supplied for HTTP
434	*/
435	if(data->state.use_range &&
436	(rtspreq & (RTSPREQ_PLAY \| RTSPREQ_PAUSE \| RTSPREQ_RECORD))) {
437
438	/* Check to see if there is a range set in the custom headers */
439	if(!Curl_checkheaders(conn, "Range") && data->state.range) {
440	Curl_safefree(conn->allocptr.rangeline);
441	conn->allocptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
442	p_range = conn->allocptr.rangeline;
443	}
444	}
445
446	/*
447	* Sanity check the custom headers
448	*/
449	if(Curl_checkheaders(conn, "CSeq")) {
450	failf(data, "CSeq cannot be set as a custom header.");
451	return CURLE_RTSP_CSEQ_ERROR;
452	}
453	if(Curl_checkheaders(conn, "Session")) {
454	failf(data, "Session ID cannot be set as a custom header.");
455	return CURLE_BAD_FUNCTION_ARGUMENT;
456	}
457
458	/* Initialize a dynamic send buffer */
459	req_buffer = Curl_add_buffer_init();
460
461	if(!req_buffer)
462	return CURLE_OUT_OF_MEMORY;
463
464	result =
465	Curl_add_bufferf(&req_buffer,
466	"%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
467	"CSeq: %ld\r\n", /* CSeq */
468	p_request, p_stream_uri, rtsp->CSeq_sent);
469	if(result)
470	return result;
471
472	/*
473	* Rather than do a normal alloc line, keep the session_id unformatted
474	* to make comparison easier
475	*/
476	if(p_session_id) {
477	result = Curl_add_bufferf(&req_buffer, "Session: %s\r\n", p_session_id);
478	if(result)
479	return result;
480	}
481
482	/*
483	* Shared HTTP-like options
484	*/
485	result = Curl_add_bufferf(&req_buffer,
486	"%s" /* transport */
487	"%s" /* accept */
488	"%s" /* accept-encoding */
489	"%s" /* range */
490	"%s" /* referrer */
491	"%s" /* user-agent */
492	"%s" /* proxyuserpwd */
493	"%s" /* userpwd */
494	,
495	p_transport ? p_transport : "",
496	p_accept ? p_accept : "",
497	p_accept_encoding ? p_accept_encoding : "",
498	p_range ? p_range : "",
499	p_referrer ? p_referrer : "",
500	p_uagent ? p_uagent : "",
501	p_proxyuserpwd ? p_proxyuserpwd : "",
502	p_userpwd ? p_userpwd : "");
503
504	/*
505	* Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
506	* with basic and digest, it will be freed anyway by the next request
507	*/
508	Curl_safefree(conn->allocptr.userpwd);
509	conn->allocptr.userpwd = NULL;
510
511	if(result)
512	return result;
513
514	if((rtspreq == RTSPREQ_SETUP) \|\| (rtspreq == RTSPREQ_DESCRIBE)) {
515	result = Curl_add_timecondition(data, req_buffer);
516	if(result)
517	return result;
518	}
519
520	result = Curl_add_custom_headers(conn, FALSE, req_buffer);
521	if(result)
522	return result;
523
524	if(rtspreq == RTSPREQ_ANNOUNCE \|\|
525	rtspreq == RTSPREQ_SET_PARAMETER \|\|
526	rtspreq == RTSPREQ_GET_PARAMETER) {
527
528	if(data->set.upload) {
529	putsize = data->state.infilesize;
530	data->set.httpreq = HTTPREQ_PUT;
531
532	}
533	else {
534	postsize = (data->state.infilesize != -1)?
535	data->state.infilesize:
536	(data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
537	data->set.httpreq = HTTPREQ_POST;
538	}
539
540	if(putsize > 0 \|\| postsize > 0) {
541	/* As stated in the http comments, it is probably not wise to
542	* actually set a custom Content-Length in the headers */
543	if(!Curl_checkheaders(conn, "Content-Length")) {
544	result =
545	Curl_add_bufferf(&req_buffer,
546	"Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
547	(data->set.upload ? putsize : postsize));
548	if(result)
549	return result;
550	}
551
552	if(rtspreq == RTSPREQ_SET_PARAMETER \|\|
553	rtspreq == RTSPREQ_GET_PARAMETER) {
554	if(!Curl_checkheaders(conn, "Content-Type")) {
555	result = Curl_add_bufferf(&req_buffer,
556	"Content-Type: text/parameters\r\n");
557	if(result)
558	return result;
559	}
560	}
561
562	if(rtspreq == RTSPREQ_ANNOUNCE) {
563	if(!Curl_checkheaders(conn, "Content-Type")) {
564	result = Curl_add_bufferf(&req_buffer,
565	"Content-Type: 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->set.httpreq = HTTPREQ_HEAD;
576	data->set.opt_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_add_buffer(&req_buffer, "\r\n", 2);
584	if(result)
585	return result;
586
587	if(postsize > 0) {
588	result = Curl_add_buffer(&req_buffer, data->set.postfields,
589	(size_t)postsize);
590	if(result)
591	return result;
592	}
593
594	/* issue the request */
595	result = Curl_add_buffer_send(&req_buffer, conn,
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(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount,
603	putsize?FIRSTSOCKET:-1,
604	putsize?&http->writebytecount:NULL);
605
606	/* Increment the CSeq on success */
607	data->state.rtsp_next_client_CSeq++;
608
609	if(http->writebytecount) {
610	/* if a request-body has been sent off, we make sure this progress is
611	noted properly */
612	Curl_pgrsSetUploadCounter(data, http->writebytecount);
613	if(Curl_pgrsUpdate(conn))
614	result = CURLE_ABORTED_BY_CALLBACK;
615	}
616
617	return result;
618	}
619
620
621	static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
622	struct connectdata *conn,
623	ssize_t *nread,
624	bool *readmore) {
625	struct SingleRequest *k = &data->req;
626	struct rtsp_conn *rtspc = &(conn->proto.rtspc);
627
628	char rtp; / moving pointer to rtp data */
629	ssize_t rtp_dataleft; /* how much data left to parse in this round */
630	char *scratch;
631	CURLcode result;
632
633	if(rtspc->rtp_buf) {
634	/* There was some leftover data the last time. Merge buffers */
635	char *newptr = Curl_saferealloc(rtspc->rtp_buf,
636	rtspc->rtp_bufsize + *nread);
637	if(!newptr) {
638	rtspc->rtp_buf = NULL;
639	rtspc->rtp_bufsize = 0;
640	return CURLE_OUT_OF_MEMORY;
641	}
642	rtspc->rtp_buf = newptr;
643	memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
644	rtspc->rtp_bufsize += *nread;
645	rtp = rtspc->rtp_buf;
646	rtp_dataleft = rtspc->rtp_bufsize;
647	}
648	else {
649	/* Just parse the request buffer directly */
650	rtp = k->str;
651	rtp_dataleft = *nread;
652	}
653
654	while((rtp_dataleft > 0) &&
655	(rtp[0] == '$')) {
656	if(rtp_dataleft > 4) {
657	int rtp_length;
658
659	/* Parse the header */
660	/* The channel identifier immediately follows and is 1 byte */
661	rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
662
663	/* The length is two bytes */
664	rtp_length = RTP_PKT_LENGTH(rtp);
665
666	if(rtp_dataleft < rtp_length + 4) {
667	/* Need more - incomplete payload*/
668	*readmore = TRUE;
669	break;
670	}
671	/* We have the full RTP interleaved packet
672	* Write out the header including the leading '$' */
673	DEBUGF(infof(data, "RTP write channel %d rtp_length %d\n",
674	rtspc->rtp_channel, rtp_length));
675	result = rtp_client_write(conn, &rtp[0], rtp_length + 4);
676	if(result) {
677	failf(data, "Got an error writing an RTP packet");
678	*readmore = FALSE;
679	Curl_safefree(rtspc->rtp_buf);
680	rtspc->rtp_buf = NULL;
681	rtspc->rtp_bufsize = 0;
682	return result;
683	}
684
685	/* Move forward in the buffer */
686	rtp_dataleft -= rtp_length + 4;
687	rtp += rtp_length + 4;
688
689	if(data->set.rtspreq == RTSPREQ_RECEIVE) {
690	/* If we are in a passive receive, give control back
691	* to the app as often as we can.
692	*/
693	k->keepon &= ~KEEP_RECV;
694	}
695	}
696	else {
697	/* Need more - incomplete header */
698	*readmore = TRUE;
699	break;
700	}
701	}
702
703	if(rtp_dataleft != 0 && rtp[0] == '$') {
704	DEBUGF(infof(data, "RTP Rewinding %zd %s\n", rtp_dataleft,
705	*readmore ? "(READMORE)" : ""));
706
707	/* Store the incomplete RTP packet for a "rewind" */
708	scratch = malloc(rtp_dataleft);
709	if(!scratch) {
710	Curl_safefree(rtspc->rtp_buf);
711	rtspc->rtp_buf = NULL;
712	rtspc->rtp_bufsize = 0;
713	return CURLE_OUT_OF_MEMORY;
714	}
715	memcpy(scratch, rtp, rtp_dataleft);
716	Curl_safefree(rtspc->rtp_buf);
717	rtspc->rtp_buf = scratch;
718	rtspc->rtp_bufsize = rtp_dataleft;
719
720	/* As far as the transfer is concerned, this data is consumed */
721	*nread = 0;
722	return CURLE_OK;
723	}
724	/* Fix up k->str to point just after the last RTP packet */
725	k->str += *nread - rtp_dataleft;
726
727	/* either all of the data has been read or...
728	* rtp now points at the next byte to parse
729	*/
730	if(rtp_dataleft > 0)
731	DEBUGASSERT(k->str[0] == rtp[0]);
732
733	DEBUGASSERT(rtp_dataleft <= nread); / sanity check */
734
735	*nread = rtp_dataleft;
736
737	/* If we get here, we have finished with the leftover/merge buffer */
738	Curl_safefree(rtspc->rtp_buf);
739	rtspc->rtp_buf = NULL;
740	rtspc->rtp_bufsize = 0;
741
742	return CURLE_OK;
743	}
744
745	static
746	CURLcode rtp_client_write(struct connectdata conn, char ptr, size_t len)
747	{
748	struct Curl_easy *data = conn->data;
749	size_t wrote;
750	curl_write_callback writeit;
751	void *user_ptr;
752
753	if(len == 0) {
754	failf(data, "Cannot write a 0 size RTP packet.");
755	return CURLE_WRITE_ERROR;
756	}
757
758	/* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
759	function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
760	data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
761	pointer to write out the RTP data. */
762	if(data->set.fwrite_rtp) {
763	writeit = data->set.fwrite_rtp;
764	user_ptr = data->set.rtp_out;
765	}
766	else {
767	writeit = data->set.fwrite_func;
768	user_ptr = data->set.out;
769	}
770
771	Curl_set_in_callback(data, true);
772	wrote = writeit(ptr, 1, len, user_ptr);
773	Curl_set_in_callback(data, false);
774
775	if(CURL_WRITEFUNC_PAUSE == wrote) {
776	failf(data, "Cannot pause RTP");
777	return CURLE_WRITE_ERROR;
778	}
779
780	if(wrote != len) {
781	failf(data, "Failed writing RTP data");
782	return CURLE_WRITE_ERROR;
783	}
784
785	return CURLE_OK;
786	}
787
788	CURLcode Curl_rtsp_parseheader(struct connectdata *conn,
789	char *header)
790	{
791	struct Curl_easy *data = conn->data;
792	long CSeq = 0;
793
794	if(checkprefix("CSeq:", header)) {
795	/* Store the received CSeq. Match is verified in rtsp_done */
796	int nc = sscanf(&header[4], ": %ld", &CSeq);
797	if(nc == 1) {
798	struct RTSP *rtsp = data->req.protop;
799	rtsp->CSeq_recv = CSeq; /* mark the request */
800	data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
801	}
802	else {
803	failf(data, "Unable to read the CSeq header: [%s]", header);
804	return CURLE_RTSP_CSEQ_ERROR;
805	}
806	}
807	else if(checkprefix("Session:", header)) {
808	char *start;
809
810	/* Find the first non-space letter */
811	start = header + 8;
812	while(start && ISSPACE(start))
813	start++;
814
815	if(!*start) {
816	failf(data, "Got a blank Session ID");
817	}
818	else if(data->set.str[STRING_RTSP_SESSION_ID]) {
819	/* If the Session ID is set, then compare */
820	if(strncmp(start, data->set.str[STRING_RTSP_SESSION_ID],
821	strlen(data->set.str[STRING_RTSP_SESSION_ID])) != 0) {
822	failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
823	start, data->set.str[STRING_RTSP_SESSION_ID]);
824	return CURLE_RTSP_SESSION_ERROR;
825	}
826	}
827	else {
828	/* If the Session ID is not set, and we find it in a response, then set
829	* it.
830	*
831	* Allow any non whitespace content, up to the field separator or end of
832	* line. RFC 2326 isn't 100% clear on the session ID and for example
833	* gstreamer does url-encoded session ID's not covered by the standard.
834	*/
835	char *end = start;
836	while(end && end != ';' && !ISSPACE(*end))
837	end++;
838
839	/* Copy the id substring into a new buffer */
840	data->set.str[STRING_RTSP_SESSION_ID] = malloc(end - start + 1);
841	if(data->set.str[STRING_RTSP_SESSION_ID] == NULL)
842	return CURLE_OUT_OF_MEMORY;
843	memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, end - start);
844	(data->set.str[STRING_RTSP_SESSION_ID])[end - start] = '\0';
845	}
846	}
847	return CURLE_OK;
848	}
849
850	#endif /* CURL_DISABLE_RTSP */

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source: vbox/trunk/src/libs/curl-7.64.0/lib/rtsp.c@ 94601

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