source: UsbWattMeter/trunk/curl-7.47.1/lib/rtsp.c@ 167

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[164]1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, 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 "rawstr.h"
37#include "select.h"
38#include "connect.h"
39#include "curl_printf.h"
40
41/* The last #include files should be: */
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 thru 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 */
61static CURLcode rtsp_do(struct connectdata *conn, bool *done);
62static CURLcode rtsp_done(struct connectdata *conn, CURLcode, bool premature);
63static CURLcode rtsp_connect(struct connectdata *conn, bool *done);
64static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead);
65
66static 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 */
77static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data,
78 struct connectdata *conn,
79 ssize_t *nread,
80 bool *readmore);
81
82static CURLcode rtsp_setup_connection(struct connectdata *conn);
83
84
85/* this returns the socket to wait for in the DO and DOING state for the multi
86 interface and then we're always _sending_ a request and thus we wait for
87 the single socket to become writable only */
88static int rtsp_getsock_do(struct connectdata *conn,
89 curl_socket_t *socks,
90 int numsocks)
91{
92 /* write mode */
93 (void)numsocks; /* unused, we trust it to be at least 1 */
94 socks[0] = conn->sock[FIRSTSOCKET];
95 return GETSOCK_WRITESOCK(0);
96}
97
98static
99CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len);
100
101
102/*
103 * RTSP handler interface.
104 */
105const struct Curl_handler Curl_handler_rtsp = {
106 "RTSP", /* scheme */
107 rtsp_setup_connection, /* setup_connection */
108 rtsp_do, /* do_it */
109 rtsp_done, /* done */
110 ZERO_NULL, /* do_more */
111 rtsp_connect, /* connect_it */
112 ZERO_NULL, /* connecting */
113 ZERO_NULL, /* doing */
114 ZERO_NULL, /* proto_getsock */
115 rtsp_getsock_do, /* doing_getsock */
116 ZERO_NULL, /* domore_getsock */
117 ZERO_NULL, /* perform_getsock */
118 rtsp_disconnect, /* disconnect */
119 rtsp_rtp_readwrite, /* readwrite */
120 PORT_RTSP, /* defport */
121 CURLPROTO_RTSP, /* protocol */
122 PROTOPT_NONE /* flags */
123};
124
125
126static CURLcode rtsp_setup_connection(struct connectdata *conn)
127{
128 struct RTSP *rtsp;
129
130 conn->data->req.protop = rtsp = calloc(1, sizeof(struct RTSP));
131 if(!rtsp)
132 return CURLE_OUT_OF_MEMORY;
133
134 return CURLE_OK;
135}
136
137
138/*
139 * The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not
140 * want to block the application forever while receiving a stream. Therefore,
141 * we cannot assume that an RTSP socket is dead just because it is readable.
142 *
143 * Instead, if it is readable, run Curl_getconnectinfo() to peek at the socket
144 * and distinguish between closed and data.
145 */
146bool Curl_rtsp_connisdead(struct connectdata *check)
147{
148 int sval;
149 bool ret_val = TRUE;
150
151 sval = Curl_socket_ready(check->sock[FIRSTSOCKET], CURL_SOCKET_BAD, 0);
152 if(sval == 0) {
153 /* timeout */
154 ret_val = FALSE;
155 }
156 else if(sval & CURL_CSELECT_ERR) {
157 /* socket is in an error state */
158 ret_val = TRUE;
159 }
160 else if((sval & CURL_CSELECT_IN) && check->data) {
161 /* readable with no error. could be closed or could be alive but we can
162 only check if we have a proper SessionHandle for the connection */
163 curl_socket_t connectinfo = Curl_getconnectinfo(check->data, &check);
164 if(connectinfo != CURL_SOCKET_BAD)
165 ret_val = FALSE;
166 }
167
168 return ret_val;
169}
170
171static CURLcode rtsp_connect(struct connectdata *conn, bool *done)
172{
173 CURLcode httpStatus;
174 struct SessionHandle *data = conn->data;
175
176 httpStatus = Curl_http_connect(conn, done);
177
178 /* Initialize the CSeq if not already done */
179 if(data->state.rtsp_next_client_CSeq == 0)
180 data->state.rtsp_next_client_CSeq = 1;
181 if(data->state.rtsp_next_server_CSeq == 0)
182 data->state.rtsp_next_server_CSeq = 1;
183
184 conn->proto.rtspc.rtp_channel = -1;
185
186 return httpStatus;
187}
188
189static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead)
190{
191 (void) dead;
192 Curl_safefree(conn->proto.rtspc.rtp_buf);
193 return CURLE_OK;
194}
195
196
197static CURLcode rtsp_done(struct connectdata *conn,
198 CURLcode status, bool premature)
199{
200 struct SessionHandle *data = conn->data;
201 struct RTSP *rtsp = data->req.protop;
202 CURLcode httpStatus;
203 long CSeq_sent;
204 long CSeq_recv;
205
206 /* Bypass HTTP empty-reply checks on receive */
207 if(data->set.rtspreq == RTSPREQ_RECEIVE)
208 premature = TRUE;
209
210 httpStatus = Curl_http_done(conn, status, premature);
211
212 if(rtsp) {
213 /* Check the sequence numbers */
214 CSeq_sent = rtsp->CSeq_sent;
215 CSeq_recv = rtsp->CSeq_recv;
216 if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
217 failf(data,
218 "The CSeq of this request %ld did not match the response %ld",
219 CSeq_sent, CSeq_recv);
220 return CURLE_RTSP_CSEQ_ERROR;
221 }
222 else if(data->set.rtspreq == RTSPREQ_RECEIVE &&
223 (conn->proto.rtspc.rtp_channel == -1)) {
224 infof(data, "Got an RTP Receive with a CSeq of %ld\n", CSeq_recv);
225 /* TODO CPC: Server -> Client logic here */
226 }
227 }
228
229 return httpStatus;
230}
231
232static CURLcode rtsp_do(struct connectdata *conn, bool *done)
233{
234 struct SessionHandle *data = conn->data;
235 CURLcode result=CURLE_OK;
236 Curl_RtspReq rtspreq = data->set.rtspreq;
237 struct RTSP *rtsp = data->req.protop;
238 struct HTTP *http;
239 Curl_send_buffer *req_buffer;
240 curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
241 curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
242
243 const char *p_request = NULL;
244 const char *p_session_id = NULL;
245 const char *p_accept = NULL;
246 const char *p_accept_encoding = NULL;
247 const char *p_range = NULL;
248 const char *p_referrer = NULL;
249 const char *p_stream_uri = NULL;
250 const char *p_transport = NULL;
251 const char *p_uagent = NULL;
252 const char *p_proxyuserpwd = NULL;
253 const char *p_userpwd = NULL;
254
255 *done = TRUE;
256
257 http = &(rtsp->http_wrapper);
258 /* Assert that no one has changed the RTSP struct in an evil way */
259 DEBUGASSERT((void *)http == (void *)rtsp);
260
261 rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
262 rtsp->CSeq_recv = 0;
263
264 /* Setup the 'p_request' pointer to the proper p_request string
265 * Since all RTSP requests are included here, there is no need to
266 * support custom requests like HTTP.
267 **/
268 data->set.opt_no_body = TRUE; /* most requests don't contain a body */
269 switch(rtspreq) {
270 default:
271 failf(data, "Got invalid RTSP request");
272 return CURLE_BAD_FUNCTION_ARGUMENT;
273 case RTSPREQ_OPTIONS:
274 p_request = "OPTIONS";
275 break;
276 case RTSPREQ_DESCRIBE:
277 p_request = "DESCRIBE";
278 data->set.opt_no_body = FALSE;
279 break;
280 case RTSPREQ_ANNOUNCE:
281 p_request = "ANNOUNCE";
282 break;
283 case RTSPREQ_SETUP:
284 p_request = "SETUP";
285 break;
286 case RTSPREQ_PLAY:
287 p_request = "PLAY";
288 break;
289 case RTSPREQ_PAUSE:
290 p_request = "PAUSE";
291 break;
292 case RTSPREQ_TEARDOWN:
293 p_request = "TEARDOWN";
294 break;
295 case RTSPREQ_GET_PARAMETER:
296 /* GET_PARAMETER's no_body status is determined later */
297 p_request = "GET_PARAMETER";
298 data->set.opt_no_body = FALSE;
299 break;
300 case RTSPREQ_SET_PARAMETER:
301 p_request = "SET_PARAMETER";
302 break;
303 case RTSPREQ_RECORD:
304 p_request = "RECORD";
305 break;
306 case RTSPREQ_RECEIVE:
307 p_request = "";
308 /* Treat interleaved RTP as body*/
309 data->set.opt_no_body = FALSE;
310 break;
311 case RTSPREQ_LAST:
312 failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
313 return CURLE_BAD_FUNCTION_ARGUMENT;
314 }
315
316 if(rtspreq == RTSPREQ_RECEIVE) {
317 Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
318 &http->readbytecount, -1, NULL);
319
320 return result;
321 }
322
323 p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
324 if(!p_session_id &&
325 (rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) {
326 failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
327 p_request);
328 return CURLE_BAD_FUNCTION_ARGUMENT;
329 }
330
331 /* TODO: proxy? */
332
333 /* Stream URI. Default to server '*' if not specified */
334 if(data->set.str[STRING_RTSP_STREAM_URI]) {
335 p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
336 }
337 else {
338 p_stream_uri = "*";
339 }
340
341 /* Transport Header for SETUP requests */
342 p_transport = Curl_checkheaders(conn, "Transport:");
343 if(rtspreq == RTSPREQ_SETUP && !p_transport) {
344 /* New Transport: setting? */
345 if(data->set.str[STRING_RTSP_TRANSPORT]) {
346 Curl_safefree(conn->allocptr.rtsp_transport);
347
348 conn->allocptr.rtsp_transport =
349 aprintf("Transport: %s\r\n",
350 data->set.str[STRING_RTSP_TRANSPORT]);
351 if(!conn->allocptr.rtsp_transport)
352 return CURLE_OUT_OF_MEMORY;
353 }
354 else {
355 failf(data,
356 "Refusing to issue an RTSP SETUP without a Transport: header.");
357 return CURLE_BAD_FUNCTION_ARGUMENT;
358 }
359
360 p_transport = conn->allocptr.rtsp_transport;
361 }
362
363 /* Accept Headers for DESCRIBE requests */
364 if(rtspreq == RTSPREQ_DESCRIBE) {
365 /* Accept Header */
366 p_accept = Curl_checkheaders(conn, "Accept:")?
367 NULL:"Accept: application/sdp\r\n";
368
369 /* Accept-Encoding header */
370 if(!Curl_checkheaders(conn, "Accept-Encoding:") &&
371 data->set.str[STRING_ENCODING]) {
372 Curl_safefree(conn->allocptr.accept_encoding);
373 conn->allocptr.accept_encoding =
374 aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
375
376 if(!conn->allocptr.accept_encoding)
377 return CURLE_OUT_OF_MEMORY;
378
379 p_accept_encoding = conn->allocptr.accept_encoding;
380 }
381 }
382
383 /* The User-Agent string might have been allocated in url.c already, because
384 it might have been used in the proxy connect, but if we have got a header
385 with the user-agent string specified, we erase the previously made string
386 here. */
387 if(Curl_checkheaders(conn, "User-Agent:") && conn->allocptr.uagent) {
388 Curl_safefree(conn->allocptr.uagent);
389 conn->allocptr.uagent = NULL;
390 }
391 else if(!Curl_checkheaders(conn, "User-Agent:") &&
392 data->set.str[STRING_USERAGENT]) {
393 p_uagent = conn->allocptr.uagent;
394 }
395
396 /* setup the authentication headers */
397 result = Curl_http_output_auth(conn, p_request, p_stream_uri, FALSE);
398 if(result)
399 return result;
400
401 p_proxyuserpwd = conn->allocptr.proxyuserpwd;
402 p_userpwd = conn->allocptr.userpwd;
403
404 /* Referrer */
405 Curl_safefree(conn->allocptr.ref);
406 if(data->change.referer && !Curl_checkheaders(conn, "Referer:"))
407 conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
408 else
409 conn->allocptr.ref = NULL;
410
411 p_referrer = conn->allocptr.ref;
412
413 /*
414 * Range Header
415 * Only applies to PLAY, PAUSE, RECORD
416 *
417 * Go ahead and use the Range stuff supplied for HTTP
418 */
419 if(data->state.use_range &&
420 (rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) {
421
422 /* Check to see if there is a range set in the custom headers */
423 if(!Curl_checkheaders(conn, "Range:") && data->state.range) {
424 Curl_safefree(conn->allocptr.rangeline);
425 conn->allocptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
426 p_range = conn->allocptr.rangeline;
427 }
428 }
429
430 /*
431 * Sanity check the custom headers
432 */
433 if(Curl_checkheaders(conn, "CSeq:")) {
434 failf(data, "CSeq cannot be set as a custom header.");
435 return CURLE_RTSP_CSEQ_ERROR;
436 }
437 if(Curl_checkheaders(conn, "Session:")) {
438 failf(data, "Session ID cannot be set as a custom header.");
439 return CURLE_BAD_FUNCTION_ARGUMENT;
440 }
441
442 /* Initialize a dynamic send buffer */
443 req_buffer = Curl_add_buffer_init();
444
445 if(!req_buffer)
446 return CURLE_OUT_OF_MEMORY;
447
448 result =
449 Curl_add_bufferf(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_add_bufferf(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_add_bufferf(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 (conn->allocptr.userpwd);
493 conn->allocptr.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(conn, 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->set.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->set.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(conn, "Content-Length:")) {
528 result = Curl_add_bufferf(req_buffer,
529 "Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
530 (data->set.upload ? putsize : postsize));
531 if(result)
532 return result;
533 }
534
535 if(rtspreq == RTSPREQ_SET_PARAMETER ||
536 rtspreq == RTSPREQ_GET_PARAMETER) {
537 if(!Curl_checkheaders(conn, "Content-Type:")) {
538 result = Curl_add_bufferf(req_buffer,
539 "Content-Type: text/parameters\r\n");
540 if(result)
541 return result;
542 }
543 }
544
545 if(rtspreq == RTSPREQ_ANNOUNCE) {
546 if(!Curl_checkheaders(conn, "Content-Type:")) {
547 result = Curl_add_bufferf(req_buffer,
548 "Content-Type: application/sdp\r\n");
549 if(result)
550 return result;
551 }
552 }
553
554 data->state.expect100header = FALSE; /* RTSP posts are simple/small */
555 }
556 else if(rtspreq == RTSPREQ_GET_PARAMETER) {
557 /* Check for an empty GET_PARAMETER (heartbeat) request */
558 data->set.httpreq = HTTPREQ_HEAD;
559 data->set.opt_no_body = TRUE;
560 }
561 }
562
563 /* RTSP never allows chunked transfer */
564 data->req.forbidchunk = TRUE;
565 /* Finish the request buffer */
566 result = Curl_add_buffer(req_buffer, "\r\n", 2);
567 if(result)
568 return result;
569
570 if(postsize > 0) {
571 result = Curl_add_buffer(req_buffer, data->set.postfields,
572 (size_t)postsize);
573 if(result)
574 return result;
575 }
576
577 /* issue the request */
578 result = Curl_add_buffer_send(req_buffer, conn,
579 &data->info.request_size, 0, FIRSTSOCKET);
580 if(result) {
581 failf(data, "Failed sending RTSP request");
582 return result;
583 }
584
585 Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount,
586 putsize?FIRSTSOCKET:-1,
587 putsize?&http->writebytecount:NULL);
588
589 /* Increment the CSeq on success */
590 data->state.rtsp_next_client_CSeq++;
591
592 if(http->writebytecount) {
593 /* if a request-body has been sent off, we make sure this progress is
594 noted properly */
595 Curl_pgrsSetUploadCounter(data, http->writebytecount);
596 if(Curl_pgrsUpdate(conn))
597 result = CURLE_ABORTED_BY_CALLBACK;
598 }
599
600 return result;
601}
602
603
604static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data,
605 struct connectdata *conn,
606 ssize_t *nread,
607 bool *readmore) {
608 struct SingleRequest *k = &data->req;
609 struct rtsp_conn *rtspc = &(conn->proto.rtspc);
610
611 char *rtp; /* moving pointer to rtp data */
612 ssize_t rtp_dataleft; /* how much data left to parse in this round */
613 char *scratch;
614 CURLcode result;
615
616 if(rtspc->rtp_buf) {
617 /* There was some leftover data the last time. Merge buffers */
618 char *newptr = realloc(rtspc->rtp_buf, rtspc->rtp_bufsize + *nread);
619 if(!newptr) {
620 Curl_safefree(rtspc->rtp_buf);
621 rtspc->rtp_buf = NULL;
622 rtspc->rtp_bufsize = 0;
623 return CURLE_OUT_OF_MEMORY;
624 }
625 rtspc->rtp_buf = newptr;
626 memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
627 rtspc->rtp_bufsize += *nread;
628 rtp = rtspc->rtp_buf;
629 rtp_dataleft = rtspc->rtp_bufsize;
630 }
631 else {
632 /* Just parse the request buffer directly */
633 rtp = k->str;
634 rtp_dataleft = *nread;
635 }
636
637 while((rtp_dataleft > 0) &&
638 (rtp[0] == '$')) {
639 if(rtp_dataleft > 4) {
640 int rtp_length;
641
642 /* Parse the header */
643 /* The channel identifier immediately follows and is 1 byte */
644 rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
645
646 /* The length is two bytes */
647 rtp_length = RTP_PKT_LENGTH(rtp);
648
649 if(rtp_dataleft < rtp_length + 4) {
650 /* Need more - incomplete payload*/
651 *readmore = TRUE;
652 break;
653 }
654 else {
655 /* We have the full RTP interleaved packet
656 * Write out the header including the leading '$' */
657 DEBUGF(infof(data, "RTP write channel %d rtp_length %d\n",
658 rtspc->rtp_channel, rtp_length));
659 result = rtp_client_write(conn, &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 }
681 else {
682 /* Need more - incomplete header */
683 *readmore = TRUE;
684 break;
685 }
686 }
687
688 if(rtp_dataleft != 0 && rtp[0] == '$') {
689 DEBUGF(infof(data, "RTP Rewinding %zd %s\n", rtp_dataleft,
690 *readmore ? "(READMORE)" : ""));
691
692 /* Store the incomplete RTP packet for a "rewind" */
693 scratch = malloc(rtp_dataleft);
694 if(!scratch) {
695 Curl_safefree(rtspc->rtp_buf);
696 rtspc->rtp_buf = NULL;
697 rtspc->rtp_bufsize = 0;
698 return CURLE_OUT_OF_MEMORY;
699 }
700 memcpy(scratch, rtp, rtp_dataleft);
701 Curl_safefree(rtspc->rtp_buf);
702 rtspc->rtp_buf = scratch;
703 rtspc->rtp_bufsize = rtp_dataleft;
704
705 /* As far as the transfer is concerned, this data is consumed */
706 *nread = 0;
707 return CURLE_OK;
708 }
709 else {
710 /* Fix up k->str to point just after the last RTP packet */
711 k->str += *nread - rtp_dataleft;
712
713 /* either all of the data has been read or...
714 * rtp now points at the next byte to parse
715 */
716 if(rtp_dataleft > 0)
717 DEBUGASSERT(k->str[0] == rtp[0]);
718
719 DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */
720
721 *nread = rtp_dataleft;
722 }
723
724 /* If we get here, we have finished with the leftover/merge buffer */
725 Curl_safefree(rtspc->rtp_buf);
726 rtspc->rtp_buf = NULL;
727 rtspc->rtp_bufsize = 0;
728
729 return CURLE_OK;
730}
731
732static
733CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len)
734{
735 struct SessionHandle *data = conn->data;
736 size_t wrote;
737 curl_write_callback writeit;
738
739 if(len == 0) {
740 failf (data, "Cannot write a 0 size RTP packet.");
741 return CURLE_WRITE_ERROR;
742 }
743
744 writeit = data->set.fwrite_rtp?data->set.fwrite_rtp:data->set.fwrite_func;
745 wrote = writeit(ptr, 1, len, data->set.rtp_out);
746
747 if(CURL_WRITEFUNC_PAUSE == wrote) {
748 failf (data, "Cannot pause RTP");
749 return CURLE_WRITE_ERROR;
750 }
751
752 if(wrote != len) {
753 failf (data, "Failed writing RTP data");
754 return CURLE_WRITE_ERROR;
755 }
756
757 return CURLE_OK;
758}
759
760CURLcode Curl_rtsp_parseheader(struct connectdata *conn,
761 char *header)
762{
763 struct SessionHandle *data = conn->data;
764 long CSeq = 0;
765
766 if(checkprefix("CSeq:", header)) {
767 /* Store the received CSeq. Match is verified in rtsp_done */
768 int nc = sscanf(&header[4], ": %ld", &CSeq);
769 if(nc == 1) {
770 struct RTSP *rtsp = data->req.protop;
771 rtsp->CSeq_recv = CSeq; /* mark the request */
772 data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
773 }
774 else {
775 failf(data, "Unable to read the CSeq header: [%s]", header);
776 return CURLE_RTSP_CSEQ_ERROR;
777 }
778 }
779 else if(checkprefix("Session:", header)) {
780 char *start;
781
782 /* Find the first non-space letter */
783 start = header + 8;
784 while(*start && ISSPACE(*start))
785 start++;
786
787 if(!*start) {
788 failf(data, "Got a blank Session ID");
789 }
790 else if(data->set.str[STRING_RTSP_SESSION_ID]) {
791 /* If the Session ID is set, then compare */
792 if(strncmp(start, data->set.str[STRING_RTSP_SESSION_ID],
793 strlen(data->set.str[STRING_RTSP_SESSION_ID])) != 0) {
794 failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
795 start, data->set.str[STRING_RTSP_SESSION_ID]);
796 return CURLE_RTSP_SESSION_ERROR;
797 }
798 }
799 else {
800 /* If the Session ID is not set, and we find it in a response, then
801 set it */
802
803 /* The session ID can be an alphanumeric or a 'safe' character
804 *
805 * RFC 2326 15.1 Base Syntax:
806 * safe = "\$" | "-" | "_" | "." | "+"
807 * */
808 char *end = start;
809 while(*end &&
810 (ISALNUM(*end) || *end == '-' || *end == '_' || *end == '.' ||
811 *end == '+' ||
812 (*end == '\\' && *(end + 1) && *(end + 1) == '$' && (++end, 1))))
813 end++;
814
815 /* Copy the id substring into a new buffer */
816 data->set.str[STRING_RTSP_SESSION_ID] = malloc(end - start + 1);
817 if(data->set.str[STRING_RTSP_SESSION_ID] == NULL)
818 return CURLE_OUT_OF_MEMORY;
819 memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, end - start);
820 (data->set.str[STRING_RTSP_SESSION_ID])[end - start] = '\0';
821 }
822 }
823 return CURLE_OK;
824}
825
826#endif /* CURL_DISABLE_RTSP */
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