rtsp.c@ 99507

最後變更在這個檔案從99507是 99344,由 vboxsync 提交於 2 年前
curl-8.0.1: Applied and adjusted our curl changes to 7.87.0 bugref:10417
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1	/***************************************************************************
2	* _ _ ____ _
3	* Project ___\| \| \| \| _ \\| \|
4	* / __\| \| \| \| \|_) \| \|
5	* \| (__\| \|_\| \| _ <\| \|___
6	* \___\|\___/\|_\| \_\_____\|
7	*
8	* Copyright (C) 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 "cfilters.h"
42	#include "strdup.h"
43	/* The last 3 #include files should be in this order */
44	#include "curl_printf.h"
45	#include "curl_memory.h"
46	#include "memdebug.h"
47
48	#define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1])))
49
50	#define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) \| \
51	((int)((unsigned char)((p)[3]))))
52
53	/* protocol-specific functions set up to be called by the main engine */
54	static CURLcode rtsp_do(struct Curl_easy data, bool done);
55	static CURLcode rtsp_done(struct Curl_easy *data, CURLcode, bool premature);
56	static CURLcode rtsp_connect(struct Curl_easy data, bool done);
57	static CURLcode rtsp_disconnect(struct Curl_easy *data,
58	struct connectdata *conn, bool dead);
59	static int rtsp_getsock_do(struct Curl_easy *data,
60	struct connectdata conn, curl_socket_t socks);
61
62	/*
63	* Parse and write out any available RTP data.
64	*
65	* nread: amount of data left after k->str. will be modified if RTP
66	* data is parsed and k->str is moved up
67	* readmore: whether or not the RTP parser needs more data right away
68	*/
69	static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
70	struct connectdata *conn,
71	ssize_t *nread,
72	bool *readmore);
73
74	static CURLcode rtsp_setup_connection(struct Curl_easy *data,
75	struct connectdata *conn);
76	static unsigned int rtsp_conncheck(struct Curl_easy *data,
77	struct connectdata *check,
78	unsigned int checks_to_perform);
79
80	/* this returns the socket to wait for in the DO and DOING state for the multi
81	interface and then we're always _sending_ a request and thus we wait for
82	the single socket to become writable only */
83	static int rtsp_getsock_do(struct Curl_easy data, struct connectdata conn,
84	curl_socket_t *socks)
85	{
86	/* write mode */
87	(void)data;
88	socks[0] = conn->sock[FIRSTSOCKET];
89	return GETSOCK_WRITESOCK(0);
90	}
91
92	static
93	CURLcode rtp_client_write(struct Curl_easy data, char ptr, size_t len);
94
95
96	/*
97	* RTSP handler interface.
98	*/
99	const struct Curl_handler Curl_handler_rtsp = {
100	"RTSP", /* scheme */
101	rtsp_setup_connection, /* setup_connection */
102	rtsp_do, /* do_it */
103	rtsp_done, /* done */
104	ZERO_NULL, /* do_more */
105	rtsp_connect, /* connect_it */
106	ZERO_NULL, /* connecting */
107	ZERO_NULL, /* doing */
108	ZERO_NULL, /* proto_getsock */
109	rtsp_getsock_do, /* doing_getsock */
110	ZERO_NULL, /* domore_getsock */
111	ZERO_NULL, /* perform_getsock */
112	rtsp_disconnect, /* disconnect */
113	rtsp_rtp_readwrite, /* readwrite */
114	rtsp_conncheck, /* connection_check */
115	ZERO_NULL, /* attach connection */
116	PORT_RTSP, /* defport */
117	CURLPROTO_RTSP, /* protocol */
118	CURLPROTO_RTSP, /* family */
119	PROTOPT_NONE /* flags */
120	};
121
122
123	static CURLcode rtsp_setup_connection(struct Curl_easy *data,
124	struct connectdata *conn)
125	{
126	struct RTSP *rtsp;
127	(void)conn;
128
129	data->req.p.rtsp = rtsp = calloc(1, sizeof(struct RTSP));
130	if(!rtsp)
131	return CURLE_OUT_OF_MEMORY;
132
133	return CURLE_OK;
134	}
135
136
137	/*
138	* Function to check on various aspects of a connection.
139	*/
140	static unsigned int rtsp_conncheck(struct Curl_easy *data,
141	struct connectdata *conn,
142	unsigned int checks_to_perform)
143	{
144	unsigned int ret_val = CONNRESULT_NONE;
145	(void)data;
146
147	if(checks_to_perform & CONNCHECK_ISDEAD) {
148	bool input_pending;
149	if(!Curl_conn_is_alive(data, conn, &input_pending))
150	ret_val \|= CONNRESULT_DEAD;
151	}
152
153	return ret_val;
154	}
155
156
157	static CURLcode rtsp_connect(struct Curl_easy data, bool done)
158	{
159	CURLcode httpStatus;
160
161	httpStatus = Curl_http_connect(data, done);
162
163	/* Initialize the CSeq if not already done */
164	if(data->state.rtsp_next_client_CSeq == 0)
165	data->state.rtsp_next_client_CSeq = 1;
166	if(data->state.rtsp_next_server_CSeq == 0)
167	data->state.rtsp_next_server_CSeq = 1;
168
169	data->conn->proto.rtspc.rtp_channel = -1;
170
171	return httpStatus;
172	}
173
174	static CURLcode rtsp_disconnect(struct Curl_easy *data,
175	struct connectdata *conn, bool dead)
176	{
177	(void) dead;
178	(void) data;
179	Curl_safefree(conn->proto.rtspc.rtp_buf);
180	return CURLE_OK;
181	}
182
183
184	static CURLcode rtsp_done(struct Curl_easy *data,
185	CURLcode status, bool premature)
186	{
187	struct RTSP *rtsp = data->req.p.rtsp;
188	CURLcode httpStatus;
189
190	/* Bypass HTTP empty-reply checks on receive */
191	if(data->set.rtspreq == RTSPREQ_RECEIVE)
192	premature = TRUE;
193
194	httpStatus = Curl_http_done(data, status, premature);
195
196	if(rtsp && !status && !httpStatus) {
197	/* Check the sequence numbers */
198	long CSeq_sent = rtsp->CSeq_sent;
199	long CSeq_recv = rtsp->CSeq_recv;
200	if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
201	failf(data,
202	"The CSeq of this request %ld did not match the response %ld",
203	CSeq_sent, CSeq_recv);
204	return CURLE_RTSP_CSEQ_ERROR;
205	}
206	if(data->set.rtspreq == RTSPREQ_RECEIVE &&
207	(data->conn->proto.rtspc.rtp_channel == -1)) {
208	infof(data, "Got an RTP Receive with a CSeq of %ld", CSeq_recv);
209	}
210	}
211
212	return httpStatus;
213	}
214
215	static CURLcode rtsp_do(struct Curl_easy data, bool done)
216	{
217	struct connectdata *conn = data->conn;
218	CURLcode result = CURLE_OK;
219	Curl_RtspReq rtspreq = data->set.rtspreq;
220	struct RTSP *rtsp = data->req.p.rtsp;
221	struct dynbuf req_buffer;
222	curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
223	curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
224
225	const char *p_request = NULL;
226	const char *p_session_id = NULL;
227	const char *p_accept = NULL;
228	const char *p_accept_encoding = NULL;
229	const char *p_range = NULL;
230	const char *p_referrer = NULL;
231	const char *p_stream_uri = NULL;
232	const char *p_transport = NULL;
233	const char *p_uagent = NULL;
234	const char *p_proxyuserpwd = NULL;
235	const char *p_userpwd = NULL;
236
237	*done = TRUE;
238
239	rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
240	rtsp->CSeq_recv = 0;
241
242	/* Setup the first_* fields to allow auth details get sent
243	to this origin */
244
245	if(!data->state.first_host) {
246	data->state.first_host = strdup(conn->host.name);
247	if(!data->state.first_host)
248	return CURLE_OUT_OF_MEMORY;
249
250	data->state.first_remote_port = conn->remote_port;
251	data->state.first_remote_protocol = conn->handler->protocol;
252	}
253
254	/* Setup the 'p_request' pointer to the proper p_request string
255	* Since all RTSP requests are included here, there is no need to
256	* support custom requests like HTTP.
257	**/
258	data->req.no_body = TRUE; /* most requests don't contain a body */
259	switch(rtspreq) {
260	default:
261	failf(data, "Got invalid RTSP request");
262	return CURLE_BAD_FUNCTION_ARGUMENT;
263	case RTSPREQ_OPTIONS:
264	p_request = "OPTIONS";
265	break;
266	case RTSPREQ_DESCRIBE:
267	p_request = "DESCRIBE";
268	data->req.no_body = FALSE;
269	break;
270	case RTSPREQ_ANNOUNCE:
271	p_request = "ANNOUNCE";
272	break;
273	case RTSPREQ_SETUP:
274	p_request = "SETUP";
275	break;
276	case RTSPREQ_PLAY:
277	p_request = "PLAY";
278	break;
279	case RTSPREQ_PAUSE:
280	p_request = "PAUSE";
281	break;
282	case RTSPREQ_TEARDOWN:
283	p_request = "TEARDOWN";
284	break;
285	case RTSPREQ_GET_PARAMETER:
286	/* GET_PARAMETER's no_body status is determined later */
287	p_request = "GET_PARAMETER";
288	data->req.no_body = FALSE;
289	break;
290	case RTSPREQ_SET_PARAMETER:
291	p_request = "SET_PARAMETER";
292	break;
293	case RTSPREQ_RECORD:
294	p_request = "RECORD";
295	break;
296	case RTSPREQ_RECEIVE:
297	p_request = "";
298	/* Treat interleaved RTP as body */
299	data->req.no_body = FALSE;
300	break;
301	case RTSPREQ_LAST:
302	failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
303	return CURLE_BAD_FUNCTION_ARGUMENT;
304	}
305
306	if(rtspreq == RTSPREQ_RECEIVE) {
307	Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, -1);
308
309	return result;
310	}
311
312	p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
313	if(!p_session_id &&
314	(rtspreq & ~(RTSPREQ_OPTIONS \| RTSPREQ_DESCRIBE \| RTSPREQ_SETUP))) {
315	failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
316	p_request);
317	return CURLE_BAD_FUNCTION_ARGUMENT;
318	}
319
320	/* Stream URI. Default to server '' if not specified /
321	if(data->set.str[STRING_RTSP_STREAM_URI]) {
322	p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
323	}
324	else {
325	p_stream_uri = "*";
326	}
327
328	/* Transport Header for SETUP requests */
329	p_transport = Curl_checkheaders(data, STRCONST("Transport"));
330	if(rtspreq == RTSPREQ_SETUP && !p_transport) {
331	/* New Transport: setting? */
332	if(data->set.str[STRING_RTSP_TRANSPORT]) {
333	Curl_safefree(data->state.aptr.rtsp_transport);
334
335	data->state.aptr.rtsp_transport =
336	aprintf("Transport: %s\r\n",
337	data->set.str[STRING_RTSP_TRANSPORT]);
338	if(!data->state.aptr.rtsp_transport)
339	return CURLE_OUT_OF_MEMORY;
340	}
341	else {
342	failf(data,
343	"Refusing to issue an RTSP SETUP without a Transport: header.");
344	return CURLE_BAD_FUNCTION_ARGUMENT;
345	}
346
347	p_transport = data->state.aptr.rtsp_transport;
348	}
349
350	/* Accept Headers for DESCRIBE requests */
351	if(rtspreq == RTSPREQ_DESCRIBE) {
352	/* Accept Header */
353	p_accept = Curl_checkheaders(data, STRCONST("Accept"))?
354	NULL:"Accept: application/sdp\r\n";
355
356	/* Accept-Encoding header */
357	if(!Curl_checkheaders(data, STRCONST("Accept-Encoding")) &&
358	data->set.str[STRING_ENCODING]) {
359	Curl_safefree(data->state.aptr.accept_encoding);
360	data->state.aptr.accept_encoding =
361	aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
362
363	if(!data->state.aptr.accept_encoding)
364	return CURLE_OUT_OF_MEMORY;
365
366	p_accept_encoding = data->state.aptr.accept_encoding;
367	}
368	}
369
370	/* The User-Agent string might have been allocated in url.c already, because
371	it might have been used in the proxy connect, but if we have got a header
372	with the user-agent string specified, we erase the previously made string
373	here. */
374	if(Curl_checkheaders(data, STRCONST("User-Agent")) &&
375	data->state.aptr.uagent) {
376	Curl_safefree(data->state.aptr.uagent);
377	data->state.aptr.uagent = NULL;
378	}
379	else if(!Curl_checkheaders(data, STRCONST("User-Agent")) &&
380	data->set.str[STRING_USERAGENT]) {
381	p_uagent = data->state.aptr.uagent;
382	}
383
384	/* setup the authentication headers */
385	result = Curl_http_output_auth(data, conn, p_request, HTTPREQ_GET,
386	p_stream_uri, FALSE);
387	if(result)
388	return result;
389
390	p_proxyuserpwd = data->state.aptr.proxyuserpwd;
391	p_userpwd = data->state.aptr.userpwd;
392
393	/* Referrer */
394	Curl_safefree(data->state.aptr.ref);
395	if(data->state.referer && !Curl_checkheaders(data, STRCONST("Referer")))
396	data->state.aptr.ref = aprintf("Referer: %s\r\n", data->state.referer);
397	else
398	data->state.aptr.ref = NULL;
399
400	p_referrer = data->state.aptr.ref;
401
402	/*
403	* Range Header
404	* Only applies to PLAY, PAUSE, RECORD
405	*
406	* Go ahead and use the Range stuff supplied for HTTP
407	*/
408	if(data->state.use_range &&
409	(rtspreq & (RTSPREQ_PLAY \| RTSPREQ_PAUSE \| RTSPREQ_RECORD))) {
410
411	/* Check to see if there is a range set in the custom headers */
412	if(!Curl_checkheaders(data, STRCONST("Range")) && data->state.range) {
413	Curl_safefree(data->state.aptr.rangeline);
414	data->state.aptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
415	p_range = data->state.aptr.rangeline;
416	}
417	}
418
419	/*
420	* Sanity check the custom headers
421	*/
422	if(Curl_checkheaders(data, STRCONST("CSeq"))) {
423	failf(data, "CSeq cannot be set as a custom header.");
424	return CURLE_RTSP_CSEQ_ERROR;
425	}
426	if(Curl_checkheaders(data, STRCONST("Session"))) {
427	failf(data, "Session ID cannot be set as a custom header.");
428	return CURLE_BAD_FUNCTION_ARGUMENT;
429	}
430
431	/* Initialize a dynamic send buffer */
432	Curl_dyn_init(&req_buffer, DYN_RTSP_REQ_HEADER);
433
434	result =
435	Curl_dyn_addf(&req_buffer,
436	"%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
437	"CSeq: %ld\r\n", /* CSeq */
438	p_request, p_stream_uri, rtsp->CSeq_sent);
439	if(result)
440	return result;
441
442	/*
443	* Rather than do a normal alloc line, keep the session_id unformatted
444	* to make comparison easier
445	*/
446	if(p_session_id) {
447	result = Curl_dyn_addf(&req_buffer, "Session: %s\r\n", p_session_id);
448	if(result)
449	return result;
450	}
451
452	/*
453	* Shared HTTP-like options
454	*/
455	result = Curl_dyn_addf(&req_buffer,
456	"%s" /* transport */
457	"%s" /* accept */
458	"%s" /* accept-encoding */
459	"%s" /* range */
460	"%s" /* referrer */
461	"%s" /* user-agent */
462	"%s" /* proxyuserpwd */
463	"%s" /* userpwd */
464	,
465	p_transport ? p_transport : "",
466	p_accept ? p_accept : "",
467	p_accept_encoding ? p_accept_encoding : "",
468	p_range ? p_range : "",
469	p_referrer ? p_referrer : "",
470	p_uagent ? p_uagent : "",
471	p_proxyuserpwd ? p_proxyuserpwd : "",
472	p_userpwd ? p_userpwd : "");
473
474	/*
475	* Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
476	* with basic and digest, it will be freed anyway by the next request
477	*/
478	Curl_safefree(data->state.aptr.userpwd);
479	data->state.aptr.userpwd = NULL;
480
481	if(result)
482	return result;
483
484	if((rtspreq == RTSPREQ_SETUP) \|\| (rtspreq == RTSPREQ_DESCRIBE)) {
485	result = Curl_add_timecondition(data, &req_buffer);
486	if(result)
487	return result;
488	}
489
490	result = Curl_add_custom_headers(data, FALSE, &req_buffer);
491	if(result)
492	return result;
493
494	if(rtspreq == RTSPREQ_ANNOUNCE \|\|
495	rtspreq == RTSPREQ_SET_PARAMETER \|\|
496	rtspreq == RTSPREQ_GET_PARAMETER) {
497
498	if(data->set.upload) {
499	putsize = data->state.infilesize;
500	data->state.httpreq = HTTPREQ_PUT;
501
502	}
503	else {
504	postsize = (data->state.infilesize != -1)?
505	data->state.infilesize:
506	(data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
507	data->state.httpreq = HTTPREQ_POST;
508	}
509
510	if(putsize > 0 \|\| postsize > 0) {
511	/* As stated in the http comments, it is probably not wise to
512	* actually set a custom Content-Length in the headers */
513	if(!Curl_checkheaders(data, STRCONST("Content-Length"))) {
514	result =
515	Curl_dyn_addf(&req_buffer,
516	"Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
517	(data->set.upload ? putsize : postsize));
518	if(result)
519	return result;
520	}
521
522	if(rtspreq == RTSPREQ_SET_PARAMETER \|\|
523	rtspreq == RTSPREQ_GET_PARAMETER) {
524	if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
525	result = Curl_dyn_addn(&req_buffer,
526	STRCONST("Content-Type: "
527	"text/parameters\r\n"));
528	if(result)
529	return result;
530	}
531	}
532
533	if(rtspreq == RTSPREQ_ANNOUNCE) {
534	if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
535	result = Curl_dyn_addn(&req_buffer,
536	STRCONST("Content-Type: "
537	"application/sdp\r\n"));
538	if(result)
539	return result;
540	}
541	}
542
543	data->state.expect100header = FALSE; /* RTSP posts are simple/small */
544	}
545	else if(rtspreq == RTSPREQ_GET_PARAMETER) {
546	/* Check for an empty GET_PARAMETER (heartbeat) request */
547	data->state.httpreq = HTTPREQ_HEAD;
548	data->req.no_body = TRUE;
549	}
550	}
551
552	/* RTSP never allows chunked transfer */
553	data->req.forbidchunk = TRUE;
554	/* Finish the request buffer */
555	result = Curl_dyn_addn(&req_buffer, STRCONST("\r\n"));
556	if(result)
557	return result;
558
559	if(postsize > 0) {
560	result = Curl_dyn_addn(&req_buffer, data->set.postfields,
561	(size_t)postsize);
562	if(result)
563	return result;
564	}
565
566	/* issue the request */
567	result = Curl_buffer_send(&req_buffer, data, data->req.p.http,
568	&data->info.request_size, 0, FIRSTSOCKET);
569	if(result) {
570	failf(data, "Failed sending RTSP request");
571	return result;
572	}
573
574	Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, putsize?FIRSTSOCKET:-1);
575
576	/* Increment the CSeq on success */
577	data->state.rtsp_next_client_CSeq++;
578
579	if(data->req.writebytecount) {
580	/* if a request-body has been sent off, we make sure this progress is
581	noted properly */
582	Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
583	if(Curl_pgrsUpdate(data))
584	result = CURLE_ABORTED_BY_CALLBACK;
585	}
586
587	return result;
588	}
589
590
591	static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
592	struct connectdata *conn,
593	ssize_t *nread,
594	bool *readmore) {
595	struct SingleRequest *k = &data->req;
596	struct rtsp_conn *rtspc = &(conn->proto.rtspc);
597
598	char rtp; / moving pointer to rtp data */
599	ssize_t rtp_dataleft; /* how much data left to parse in this round */
600	char *scratch;
601	CURLcode result;
602
603	if(rtspc->rtp_buf) {
604	/* There was some leftover data the last time. Merge buffers */
605	char *newptr = Curl_saferealloc(rtspc->rtp_buf,
606	rtspc->rtp_bufsize + *nread);
607	if(!newptr) {
608	rtspc->rtp_buf = NULL;
609	rtspc->rtp_bufsize = 0;
610	return CURLE_OUT_OF_MEMORY;
611	}
612	rtspc->rtp_buf = newptr;
613	memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
614	rtspc->rtp_bufsize += *nread;
615	rtp = rtspc->rtp_buf;
616	rtp_dataleft = rtspc->rtp_bufsize;
617	}
618	else {
619	/* Just parse the request buffer directly */
620	rtp = k->str;
621	rtp_dataleft = *nread;
622	}
623
624	while((rtp_dataleft > 0) &&
625	(rtp[0] == '$')) {
626	if(rtp_dataleft > 4) {
627	int rtp_length;
628
629	/* Parse the header */
630	/* The channel identifier immediately follows and is 1 byte */
631	rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
632
633	/* The length is two bytes */
634	rtp_length = RTP_PKT_LENGTH(rtp);
635
636	if(rtp_dataleft < rtp_length + 4) {
637	/* Need more - incomplete payload */
638	*readmore = TRUE;
639	break;
640	}
641	/* We have the full RTP interleaved packet
642	* Write out the header including the leading '$' */
643	DEBUGF(infof(data, "RTP write channel %d rtp_length %d",
644	rtspc->rtp_channel, rtp_length));
645	result = rtp_client_write(data, &rtp[0], rtp_length + 4);
646	if(result) {
647	failf(data, "Got an error writing an RTP packet");
648	*readmore = FALSE;
649	Curl_safefree(rtspc->rtp_buf);
650	rtspc->rtp_buf = NULL;
651	rtspc->rtp_bufsize = 0;
652	return result;
653	}
654
655	/* Move forward in the buffer */
656	rtp_dataleft -= rtp_length + 4;
657	rtp += rtp_length + 4;
658
659	if(data->set.rtspreq == RTSPREQ_RECEIVE) {
660	/* If we are in a passive receive, give control back
661	* to the app as often as we can.
662	*/
663	k->keepon &= ~KEEP_RECV;
664	}
665	}
666	else {
667	/* Need more - incomplete header */
668	*readmore = TRUE;
669	break;
670	}
671	}
672
673	if(rtp_dataleft && rtp[0] == '$') {
674	DEBUGF(infof(data, "RTP Rewinding %zd %s", rtp_dataleft,
675	*readmore ? "(READMORE)" : ""));
676
677	/* Store the incomplete RTP packet for a "rewind" */
678	scratch = malloc(rtp_dataleft);
679	if(!scratch) {
680	Curl_safefree(rtspc->rtp_buf);
681	rtspc->rtp_buf = NULL;
682	rtspc->rtp_bufsize = 0;
683	return CURLE_OUT_OF_MEMORY;
684	}
685	memcpy(scratch, rtp, rtp_dataleft);
686	Curl_safefree(rtspc->rtp_buf);
687	rtspc->rtp_buf = scratch;
688	rtspc->rtp_bufsize = rtp_dataleft;
689
690	/* As far as the transfer is concerned, this data is consumed */
691	*nread = 0;
692	return CURLE_OK;
693	}
694	/* Fix up k->str to point just after the last RTP packet */
695	k->str += *nread - rtp_dataleft;
696
697	/* either all of the data has been read or...
698	* rtp now points at the next byte to parse
699	*/
700	if(rtp_dataleft > 0)
701	DEBUGASSERT(k->str[0] == rtp[0]);
702
703	DEBUGASSERT(rtp_dataleft <= nread); / sanity check */
704
705	*nread = rtp_dataleft;
706
707	/* If we get here, we have finished with the leftover/merge buffer */
708	Curl_safefree(rtspc->rtp_buf);
709	rtspc->rtp_buf = NULL;
710	rtspc->rtp_bufsize = 0;
711
712	return CURLE_OK;
713	}
714
715	static
716	CURLcode rtp_client_write(struct Curl_easy data, char ptr, size_t len)
717	{
718	size_t wrote;
719	curl_write_callback writeit;
720	void *user_ptr;
721
722	if(len == 0) {
723	failf(data, "Cannot write a 0 size RTP packet.");
724	return CURLE_WRITE_ERROR;
725	}
726
727	/* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
728	function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
729	data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
730	pointer to write out the RTP data. */
731	if(data->set.fwrite_rtp) {
732	writeit = data->set.fwrite_rtp;
733	user_ptr = data->set.rtp_out;
734	}
735	else {
736	writeit = data->set.fwrite_func;
737	user_ptr = data->set.out;
738	}
739
740	Curl_set_in_callback(data, true);
741	wrote = writeit(ptr, 1, len, user_ptr);
742	Curl_set_in_callback(data, false);
743
744	if(CURL_WRITEFUNC_PAUSE == wrote) {
745	failf(data, "Cannot pause RTP");
746	return CURLE_WRITE_ERROR;
747	}
748
749	if(wrote != len) {
750	failf(data, "Failed writing RTP data");
751	return CURLE_WRITE_ERROR;
752	}
753
754	return CURLE_OK;
755	}
756
757	CURLcode Curl_rtsp_parseheader(struct Curl_easy data, char header)
758	{
759	if(checkprefix("CSeq:", header)) {
760	long CSeq = 0;
761	char *endp;
762	char *p = &header[5];
763	while(ISBLANK(*p))
764	p++;
765	CSeq = strtol(p, &endp, 10);
766	if(p != endp) {
767	struct RTSP *rtsp = data->req.p.rtsp;
768	rtsp->CSeq_recv = CSeq; /* mark the request */
769	data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
770	}
771	else {
772	failf(data, "Unable to read the CSeq header: [%s]", header);
773	return CURLE_RTSP_CSEQ_ERROR;
774	}
775	}
776	else if(checkprefix("Session:", header)) {
777	char *start;
778	char *end;
779	size_t idlen;
780
781	/* Find the first non-space letter */
782	start = header + 8;
783	while(start && ISBLANK(start))
784	start++;
785
786	if(!*start) {
787	failf(data, "Got a blank Session ID");
788	return CURLE_RTSP_SESSION_ERROR;
789	}
790
791	/* Find the end of Session ID
792	*
793	* Allow any non whitespace content, up to the field separator or end of
794	* line. RFC 2326 isn't 100% clear on the session ID and for example
795	* gstreamer does url-encoded session ID's not covered by the standard.
796	*/
797	end = start;
798	while(end && end != ';' && !ISSPACE(*end))
799	end++;
800	idlen = end - start;
801
802	if(data->set.str[STRING_RTSP_SESSION_ID]) {
803
804	/* If the Session ID is set, then compare */
805	if(strlen(data->set.str[STRING_RTSP_SESSION_ID]) != idlen \|\|
806	strncmp(start, data->set.str[STRING_RTSP_SESSION_ID], idlen) != 0) {
807	failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
808	start, data->set.str[STRING_RTSP_SESSION_ID]);
809	return CURLE_RTSP_SESSION_ERROR;
810	}
811	}
812	else {
813	/* If the Session ID is not set, and we find it in a response, then set
814	* it.
815	*/
816
817	/* Copy the id substring into a new buffer */
818	data->set.str[STRING_RTSP_SESSION_ID] = malloc(idlen + 1);
819	if(!data->set.str[STRING_RTSP_SESSION_ID])
820	return CURLE_OUT_OF_MEMORY;
821	memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, idlen);
822	(data->set.str[STRING_RTSP_SESSION_ID])[idlen] = '\0';
823	}
824	}
825	return CURLE_OK;
826	}
827
828	#endif /* CURL_DISABLE_RTSP or using Hyper */

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source: vbox/trunk/src/libs/curl-8.0.1/lib/rtsp.c@ 99507

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