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 http://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 */
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 SessionHandle *data,
78 struct connectdata *conn,
79 ssize_t *nread,
80 bool *readmore);
81
82 static 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 */
rtsp_getsock_do(struct connectdata * conn,curl_socket_t * socks,int numsocks)88 static 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
98 static
99 CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len);
100
101
102 /*
103 * RTSP handler interface.
104 */
105 const 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
rtsp_setup_connection(struct connectdata * conn)126 static 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 */
Curl_rtsp_connisdead(struct connectdata * check)146 bool 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
rtsp_connect(struct connectdata * conn,bool * done)171 static 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
rtsp_disconnect(struct connectdata * conn,bool dead)189 static 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
rtsp_done(struct connectdata * conn,CURLcode status,bool premature)197 static 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
rtsp_do(struct connectdata * conn,bool * done)232 static 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
253 *done = TRUE;
254
255 http = &(rtsp->http_wrapper);
256 /* Assert that no one has changed the RTSP struct in an evil way */
257 DEBUGASSERT((void *)http == (void *)rtsp);
258
259 rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
260 rtsp->CSeq_recv = 0;
261
262 /* Setup the 'p_request' pointer to the proper p_request string
263 * Since all RTSP requests are included here, there is no need to
264 * support custom requests like HTTP.
265 **/
266 data->set.opt_no_body = TRUE; /* most requests don't contain a body */
267 switch(rtspreq) {
268 default:
269 failf(data, "Got invalid RTSP request");
270 return CURLE_BAD_FUNCTION_ARGUMENT;
271 case RTSPREQ_OPTIONS:
272 p_request = "OPTIONS";
273 break;
274 case RTSPREQ_DESCRIBE:
275 p_request = "DESCRIBE";
276 data->set.opt_no_body = FALSE;
277 break;
278 case RTSPREQ_ANNOUNCE:
279 p_request = "ANNOUNCE";
280 break;
281 case RTSPREQ_SETUP:
282 p_request = "SETUP";
283 break;
284 case RTSPREQ_PLAY:
285 p_request = "PLAY";
286 break;
287 case RTSPREQ_PAUSE:
288 p_request = "PAUSE";
289 break;
290 case RTSPREQ_TEARDOWN:
291 p_request = "TEARDOWN";
292 break;
293 case RTSPREQ_GET_PARAMETER:
294 /* GET_PARAMETER's no_body status is determined later */
295 p_request = "GET_PARAMETER";
296 data->set.opt_no_body = FALSE;
297 break;
298 case RTSPREQ_SET_PARAMETER:
299 p_request = "SET_PARAMETER";
300 break;
301 case RTSPREQ_RECORD:
302 p_request = "RECORD";
303 break;
304 case RTSPREQ_RECEIVE:
305 p_request = "";
306 /* Treat interleaved RTP as body*/
307 data->set.opt_no_body = FALSE;
308 break;
309 case RTSPREQ_LAST:
310 failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
311 return CURLE_BAD_FUNCTION_ARGUMENT;
312 }
313
314 if(rtspreq == RTSPREQ_RECEIVE) {
315 Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
316 &http->readbytecount, -1, NULL);
317
318 return result;
319 }
320
321 p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
322 if(!p_session_id &&
323 (rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) {
324 failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
325 p_request);
326 return CURLE_BAD_FUNCTION_ARGUMENT;
327 }
328
329 /* TODO: auth? */
330 /* TODO: proxy? */
331
332 /* Stream URI. Default to server '*' if not specified */
333 if(data->set.str[STRING_RTSP_STREAM_URI]) {
334 p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
335 }
336 else {
337 p_stream_uri = "*";
338 }
339
340 /* Transport Header for SETUP requests */
341 p_transport = Curl_checkheaders(conn, "Transport:");
342 if(rtspreq == RTSPREQ_SETUP && !p_transport) {
343 /* New Transport: setting? */
344 if(data->set.str[STRING_RTSP_TRANSPORT]) {
345 Curl_safefree(conn->allocptr.rtsp_transport);
346
347 conn->allocptr.rtsp_transport =
348 aprintf("Transport: %s\r\n",
349 data->set.str[STRING_RTSP_TRANSPORT]);
350 if(!conn->allocptr.rtsp_transport)
351 return CURLE_OUT_OF_MEMORY;
352 }
353 else {
354 failf(data,
355 "Refusing to issue an RTSP SETUP without a Transport: header.");
356 return CURLE_BAD_FUNCTION_ARGUMENT;
357 }
358
359 p_transport = conn->allocptr.rtsp_transport;
360 }
361
362 /* Accept Headers for DESCRIBE requests */
363 if(rtspreq == RTSPREQ_DESCRIBE) {
364 /* Accept Header */
365 p_accept = Curl_checkheaders(conn, "Accept:")?
366 NULL:"Accept: application/sdp\r\n";
367
368 /* Accept-Encoding header */
369 if(!Curl_checkheaders(conn, "Accept-Encoding:") &&
370 data->set.str[STRING_ENCODING]) {
371 Curl_safefree(conn->allocptr.accept_encoding);
372 conn->allocptr.accept_encoding =
373 aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
374
375 if(!conn->allocptr.accept_encoding)
376 return CURLE_OUT_OF_MEMORY;
377
378 p_accept_encoding = conn->allocptr.accept_encoding;
379 }
380 }
381
382 /* The User-Agent string might have been allocated in url.c already, because
383 it might have been used in the proxy connect, but if we have got a header
384 with the user-agent string specified, we erase the previously made string
385 here. */
386 if(Curl_checkheaders(conn, "User-Agent:") && conn->allocptr.uagent) {
387 Curl_safefree(conn->allocptr.uagent);
388 conn->allocptr.uagent = NULL;
389 }
390 else if(!Curl_checkheaders(conn, "User-Agent:") &&
391 data->set.str[STRING_USERAGENT]) {
392 p_uagent = conn->allocptr.uagent;
393 }
394
395 /* Referrer */
396 Curl_safefree(conn->allocptr.ref);
397 if(data->change.referer && !Curl_checkheaders(conn, "Referer:"))
398 conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
399 else
400 conn->allocptr.ref = NULL;
401
402 p_referrer = conn->allocptr.ref;
403
404 /*
405 * Range Header
406 * Only applies to PLAY, PAUSE, RECORD
407 *
408 * Go ahead and use the Range stuff supplied for HTTP
409 */
410 if(data->state.use_range &&
411 (rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) {
412
413 /* Check to see if there is a range set in the custom headers */
414 if(!Curl_checkheaders(conn, "Range:") && data->state.range) {
415 Curl_safefree(conn->allocptr.rangeline);
416 conn->allocptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
417 p_range = conn->allocptr.rangeline;
418 }
419 }
420
421 /*
422 * Sanity check the custom headers
423 */
424 if(Curl_checkheaders(conn, "CSeq:")) {
425 failf(data, "CSeq cannot be set as a custom header.");
426 return CURLE_RTSP_CSEQ_ERROR;
427 }
428 if(Curl_checkheaders(conn, "Session:")) {
429 failf(data, "Session ID cannot be set as a custom header.");
430 return CURLE_BAD_FUNCTION_ARGUMENT;
431 }
432
433 /* Initialize a dynamic send buffer */
434 req_buffer = Curl_add_buffer_init();
435
436 if(!req_buffer)
437 return CURLE_OUT_OF_MEMORY;
438
439 result =
440 Curl_add_bufferf(req_buffer,
441 "%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
442 "CSeq: %ld\r\n", /* CSeq */
443 (p_request ? p_request : ""), p_stream_uri,
444 rtsp->CSeq_sent);
445 if(result)
446 return result;
447
448 /*
449 * Rather than do a normal alloc line, keep the session_id unformatted
450 * to make comparison easier
451 */
452 if(p_session_id) {
453 result = Curl_add_bufferf(req_buffer, "Session: %s\r\n", p_session_id);
454 if(result)
455 return result;
456 }
457
458 /*
459 * Shared HTTP-like options
460 */
461 result = Curl_add_bufferf(req_buffer,
462 "%s" /* transport */
463 "%s" /* accept */
464 "%s" /* accept-encoding */
465 "%s" /* range */
466 "%s" /* referrer */
467 "%s" /* user-agent */
468 ,
469 p_transport ? p_transport : "",
470 p_accept ? p_accept : "",
471 p_accept_encoding ? p_accept_encoding : "",
472 p_range ? p_range : "",
473 p_referrer ? p_referrer : "",
474 p_uagent ? p_uagent : "");
475 if(result)
476 return result;
477
478 if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) {
479 result = Curl_add_timecondition(data, req_buffer);
480 if(result)
481 return result;
482 }
483
484 result = Curl_add_custom_headers(conn, FALSE, req_buffer);
485 if(result)
486 return result;
487
488 if(rtspreq == RTSPREQ_ANNOUNCE ||
489 rtspreq == RTSPREQ_SET_PARAMETER ||
490 rtspreq == RTSPREQ_GET_PARAMETER) {
491
492 if(data->set.upload) {
493 putsize = data->state.infilesize;
494 data->set.httpreq = HTTPREQ_PUT;
495
496 }
497 else {
498 postsize = (data->state.infilesize != -1)?
499 data->state.infilesize:
500 (data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
501 data->set.httpreq = HTTPREQ_POST;
502 }
503
504 if(putsize > 0 || postsize > 0) {
505 /* As stated in the http comments, it is probably not wise to
506 * actually set a custom Content-Length in the headers */
507 if(!Curl_checkheaders(conn, "Content-Length:")) {
508 result = Curl_add_bufferf(req_buffer,
509 "Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
510 (data->set.upload ? putsize : postsize));
511 if(result)
512 return result;
513 }
514
515 if(rtspreq == RTSPREQ_SET_PARAMETER ||
516 rtspreq == RTSPREQ_GET_PARAMETER) {
517 if(!Curl_checkheaders(conn, "Content-Type:")) {
518 result = Curl_add_bufferf(req_buffer,
519 "Content-Type: text/parameters\r\n");
520 if(result)
521 return result;
522 }
523 }
524
525 if(rtspreq == RTSPREQ_ANNOUNCE) {
526 if(!Curl_checkheaders(conn, "Content-Type:")) {
527 result = Curl_add_bufferf(req_buffer,
528 "Content-Type: application/sdp\r\n");
529 if(result)
530 return result;
531 }
532 }
533
534 data->state.expect100header = FALSE; /* RTSP posts are simple/small */
535 }
536 else if(rtspreq == RTSPREQ_GET_PARAMETER) {
537 /* Check for an empty GET_PARAMETER (heartbeat) request */
538 data->set.httpreq = HTTPREQ_HEAD;
539 data->set.opt_no_body = TRUE;
540 }
541 }
542
543 /* RTSP never allows chunked transfer */
544 data->req.forbidchunk = TRUE;
545 /* Finish the request buffer */
546 result = Curl_add_buffer(req_buffer, "\r\n", 2);
547 if(result)
548 return result;
549
550 if(postsize > 0) {
551 result = Curl_add_buffer(req_buffer, data->set.postfields,
552 (size_t)postsize);
553 if(result)
554 return result;
555 }
556
557 /* issue the request */
558 result = Curl_add_buffer_send(req_buffer, conn,
559 &data->info.request_size, 0, FIRSTSOCKET);
560 if(result) {
561 failf(data, "Failed sending RTSP request");
562 return result;
563 }
564
565 Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount,
566 putsize?FIRSTSOCKET:-1,
567 putsize?&http->writebytecount:NULL);
568
569 /* Increment the CSeq on success */
570 data->state.rtsp_next_client_CSeq++;
571
572 if(http->writebytecount) {
573 /* if a request-body has been sent off, we make sure this progress is
574 noted properly */
575 Curl_pgrsSetUploadCounter(data, http->writebytecount);
576 if(Curl_pgrsUpdate(conn))
577 result = CURLE_ABORTED_BY_CALLBACK;
578 }
579
580 return result;
581 }
582
583
rtsp_rtp_readwrite(struct SessionHandle * data,struct connectdata * conn,ssize_t * nread,bool * readmore)584 static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data,
585 struct connectdata *conn,
586 ssize_t *nread,
587 bool *readmore) {
588 struct SingleRequest *k = &data->req;
589 struct rtsp_conn *rtspc = &(conn->proto.rtspc);
590
591 char *rtp; /* moving pointer to rtp data */
592 ssize_t rtp_dataleft; /* how much data left to parse in this round */
593 char *scratch;
594 CURLcode result;
595
596 if(rtspc->rtp_buf) {
597 /* There was some leftover data the last time. Merge buffers */
598 char *newptr = realloc(rtspc->rtp_buf, rtspc->rtp_bufsize + *nread);
599 if(!newptr) {
600 Curl_safefree(rtspc->rtp_buf);
601 rtspc->rtp_buf = NULL;
602 rtspc->rtp_bufsize = 0;
603 return CURLE_OUT_OF_MEMORY;
604 }
605 rtspc->rtp_buf = newptr;
606 memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
607 rtspc->rtp_bufsize += *nread;
608 rtp = rtspc->rtp_buf;
609 rtp_dataleft = rtspc->rtp_bufsize;
610 }
611 else {
612 /* Just parse the request buffer directly */
613 rtp = k->str;
614 rtp_dataleft = *nread;
615 }
616
617 while((rtp_dataleft > 0) &&
618 (rtp[0] == '$')) {
619 if(rtp_dataleft > 4) {
620 int rtp_length;
621
622 /* Parse the header */
623 /* The channel identifier immediately follows and is 1 byte */
624 rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
625
626 /* The length is two bytes */
627 rtp_length = RTP_PKT_LENGTH(rtp);
628
629 if(rtp_dataleft < rtp_length + 4) {
630 /* Need more - incomplete payload*/
631 *readmore = TRUE;
632 break;
633 }
634 else {
635 /* We have the full RTP interleaved packet
636 * Write out the header including the leading '$' */
637 DEBUGF(infof(data, "RTP write channel %d rtp_length %d\n",
638 rtspc->rtp_channel, rtp_length));
639 result = rtp_client_write(conn, &rtp[0], rtp_length + 4);
640 if(result) {
641 failf(data, "Got an error writing an RTP packet");
642 *readmore = FALSE;
643 Curl_safefree(rtspc->rtp_buf);
644 rtspc->rtp_buf = NULL;
645 rtspc->rtp_bufsize = 0;
646 return result;
647 }
648
649 /* Move forward in the buffer */
650 rtp_dataleft -= rtp_length + 4;
651 rtp += rtp_length + 4;
652
653 if(data->set.rtspreq == RTSPREQ_RECEIVE) {
654 /* If we are in a passive receive, give control back
655 * to the app as often as we can.
656 */
657 k->keepon &= ~KEEP_RECV;
658 }
659 }
660 }
661 else {
662 /* Need more - incomplete header */
663 *readmore = TRUE;
664 break;
665 }
666 }
667
668 if(rtp_dataleft != 0 && rtp[0] == '$') {
669 DEBUGF(infof(data, "RTP Rewinding %zd %s\n", rtp_dataleft,
670 *readmore ? "(READMORE)" : ""));
671
672 /* Store the incomplete RTP packet for a "rewind" */
673 scratch = malloc(rtp_dataleft);
674 if(!scratch) {
675 Curl_safefree(rtspc->rtp_buf);
676 rtspc->rtp_buf = NULL;
677 rtspc->rtp_bufsize = 0;
678 return CURLE_OUT_OF_MEMORY;
679 }
680 memcpy(scratch, rtp, rtp_dataleft);
681 Curl_safefree(rtspc->rtp_buf);
682 rtspc->rtp_buf = scratch;
683 rtspc->rtp_bufsize = rtp_dataleft;
684
685 /* As far as the transfer is concerned, this data is consumed */
686 *nread = 0;
687 return CURLE_OK;
688 }
689 else {
690 /* Fix up k->str to point just after the last RTP packet */
691 k->str += *nread - rtp_dataleft;
692
693 /* either all of the data has been read or...
694 * rtp now points at the next byte to parse
695 */
696 if(rtp_dataleft > 0)
697 DEBUGASSERT(k->str[0] == rtp[0]);
698
699 DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */
700
701 *nread = rtp_dataleft;
702 }
703
704 /* If we get here, we have finished with the leftover/merge buffer */
705 Curl_safefree(rtspc->rtp_buf);
706 rtspc->rtp_buf = NULL;
707 rtspc->rtp_bufsize = 0;
708
709 return CURLE_OK;
710 }
711
712 static
rtp_client_write(struct connectdata * conn,char * ptr,size_t len)713 CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len)
714 {
715 struct SessionHandle *data = conn->data;
716 size_t wrote;
717 curl_write_callback writeit;
718
719 if(len == 0) {
720 failf (data, "Cannot write a 0 size RTP packet.");
721 return CURLE_WRITE_ERROR;
722 }
723
724 writeit = data->set.fwrite_rtp?data->set.fwrite_rtp:data->set.fwrite_func;
725 wrote = writeit(ptr, 1, len, data->set.rtp_out);
726
727 if(CURL_WRITEFUNC_PAUSE == wrote) {
728 failf (data, "Cannot pause RTP");
729 return CURLE_WRITE_ERROR;
730 }
731
732 if(wrote != len) {
733 failf (data, "Failed writing RTP data");
734 return CURLE_WRITE_ERROR;
735 }
736
737 return CURLE_OK;
738 }
739
Curl_rtsp_parseheader(struct connectdata * conn,char * header)740 CURLcode Curl_rtsp_parseheader(struct connectdata *conn,
741 char *header)
742 {
743 struct SessionHandle *data = conn->data;
744 long CSeq = 0;
745
746 if(checkprefix("CSeq:", header)) {
747 /* Store the received CSeq. Match is verified in rtsp_done */
748 int nc = sscanf(&header[4], ": %ld", &CSeq);
749 if(nc == 1) {
750 struct RTSP *rtsp = data->req.protop;
751 rtsp->CSeq_recv = CSeq; /* mark the request */
752 data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
753 }
754 else {
755 failf(data, "Unable to read the CSeq header: [%s]", header);
756 return CURLE_RTSP_CSEQ_ERROR;
757 }
758 }
759 else if(checkprefix("Session:", header)) {
760 char *start;
761
762 /* Find the first non-space letter */
763 start = header + 8;
764 while(*start && ISSPACE(*start))
765 start++;
766
767 if(!*start) {
768 failf(data, "Got a blank Session ID");
769 }
770 else if(data->set.str[STRING_RTSP_SESSION_ID]) {
771 /* If the Session ID is set, then compare */
772 if(strncmp(start, data->set.str[STRING_RTSP_SESSION_ID],
773 strlen(data->set.str[STRING_RTSP_SESSION_ID])) != 0) {
774 failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
775 start, data->set.str[STRING_RTSP_SESSION_ID]);
776 return CURLE_RTSP_SESSION_ERROR;
777 }
778 }
779 else {
780 /* If the Session ID is not set, and we find it in a response, then
781 set it */
782
783 /* The session ID can be an alphanumeric or a 'safe' character
784 *
785 * RFC 2326 15.1 Base Syntax:
786 * safe = "\$" | "-" | "_" | "." | "+"
787 * */
788 char *end = start;
789 while(*end &&
790 (ISALNUM(*end) || *end == '-' || *end == '_' || *end == '.' ||
791 *end == '+' ||
792 (*end == '\\' && *(end + 1) && *(end + 1) == '$' && (++end, 1))))
793 end++;
794
795 /* Copy the id substring into a new buffer */
796 data->set.str[STRING_RTSP_SESSION_ID] = malloc(end - start + 1);
797 if(data->set.str[STRING_RTSP_SESSION_ID] == NULL)
798 return CURLE_OUT_OF_MEMORY;
799 memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, end - start);
800 (data->set.str[STRING_RTSP_SESSION_ID])[end - start] = '\0';
801 }
802 }
803 return CURLE_OK;
804 }
805
806 #endif /* CURL_DISABLE_RTSP */
807