1 /*****************************************************************************
2 * sap.c : SAP interface module
3 *****************************************************************************
4 * Copyright (C) 2004-2005 the VideoLAN team
5 * Copyright © 2007 Rémi Denis-Courmont
8 * Authors: Clément Stenac <zorglub@videolan.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
37 #include <vlc_demux.h>
38 #include <vlc_services_discovery.h>
40 #include <vlc_network.h>
41 #include <vlc_charset.h>
46 #ifdef HAVE_ARPA_INET_H
47 # include <arpa/inet.h>
61 /************************************************************************
62 * Macros and definitions
63 ************************************************************************/
65 #define MAX_LINE_LENGTH 256
67 /* SAP is always on that port */
69 /* Global-scope SAP address */
70 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
71 /* Organization-local SAP address */
72 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
73 /* Local (smallest non-link-local scope) SAP address */
74 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
75 /* Link-local SAP address */
76 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
79 /*****************************************************************************
81 *****************************************************************************/
82 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
83 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
84 "right addresses to listen to. However, you " \
85 "can specify a specific address." )
86 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
87 #define SAP_TIMEOUT_LONGTEXT N_( \
88 "Delay after which SAP items get deleted if no new announcement " \
90 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
91 #define SAP_PARSE_LONGTEXT N_( \
92 "This enables actual parsing of the announces by the SAP module. " \
93 "Otherwise, all announcements are parsed by the \"live555\" " \
94 "(RTP/RTSP) module." )
95 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
96 #define SAP_STRICT_LONGTEXT N_( \
97 "When this is set, the SAP parser will discard some non-compliant " \
101 static int Open ( vlc_object_t * );
102 static void Close( vlc_object_t * );
103 static int OpenDemux ( vlc_object_t * );
104 static void CloseDemux ( vlc_object_t * );
106 VLC_SD_PROBE_HELPER("sap", "Network streams (SAP)", SD_CAT_LAN)
109 set_shortname( N_("SAP"))
110 set_description( N_("Network streams (SAP)") )
111 set_category( CAT_PLAYLIST )
112 set_subcategory( SUBCAT_PLAYLIST_SD )
114 add_string( "sap-addr", NULL,
115 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, true )
116 add_obsolete_bool( "sap-ipv4" ) /* since 2.0.0 */
117 add_obsolete_bool( "sap-ipv6" ) /* since 2.0.0 */
118 add_integer( "sap-timeout", 1800,
119 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, true )
120 add_bool( "sap-parse", true,
121 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, true )
122 add_bool( "sap-strict", false,
123 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, true )
124 add_obsolete_bool( "sap-timeshift" ) /* Redumdant since 1.0.0 */
126 set_capability( "services_discovery", 0 )
127 set_callbacks( Open, Close )
129 VLC_SD_PROBE_SUBMODULE
132 set_description( N_("SDP Descriptions parser") )
133 add_shortcut( "sdp" )
134 set_capability( "demux", 51 )
135 set_callbacks( OpenDemux, CloseDemux )
139 /*****************************************************************************
141 *****************************************************************************/
143 typedef struct sdp_t sdp_t;
144 typedef struct attribute_t attribute_t;
145 typedef struct sap_announce_t sap_announce_t;
150 struct sdp_t *parent;
152 struct sockaddr_storage addr;
156 attribute_t **pp_attributes;
160 /* The structure that contains sdp information */
168 uint64_t session_version;
169 unsigned orig_ip_version;
170 char orig_host[1024];
173 char *psz_sessionname;
181 /* a= global attributes */
183 attribute_t **pp_attributes;
185 /* medias (well, we only support one atm) */
187 struct sdp_media_t *mediav;
196 struct sap_announce_t
200 uint8_t i_period_trust;
203 uint32_t i_source[4];
205 /* SAP annnounces must only contain one SDP */
208 input_item_t * p_item;
211 struct services_discovery_sys_t
215 /* Socket descriptors */
219 /* Table of announces */
221 struct sap_announce_t **pp_announces;
235 /*****************************************************************************
237 *****************************************************************************/
241 static int Demux( demux_t *p_demux );
242 static int Control( demux_t *, int, va_list );
243 static void *Run ( void *p_sd );
245 /* Main parsing functions */
246 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
247 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
248 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
249 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint32_t *, uint16_t, sdp_t * );
250 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
252 /* Helper functions */
253 static inline attribute_t *MakeAttribute (const char *str);
254 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
255 static inline void FreeAttribute (attribute_t *a);
256 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
259 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
260 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
261 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
262 static void FreeSDP( sdp_t *p_sdp );
264 static inline int min_int( int a, int b )
266 return a > b ? b : a;
269 static bool IsWellKnownPayload (int type)
272 { /* Should be in sync with modules/demux/rtp.c */
273 case 0: /* PCMU/8000 */
275 case 8: /* PCMA/8000 */
276 case 10: /* L16/44100/2 */
277 case 11: /* L16/44100 */
279 case 14: /* MPA/90000 */
280 case 32: /* MPV/90000 */
281 case 33: /* MP2/90000 */
287 /*****************************************************************************
288 * Open: initialize and create stuff
289 *****************************************************************************/
290 static int Open( vlc_object_t *p_this )
292 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
293 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
294 malloc( sizeof( services_discovery_sys_t ) );
298 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
305 p_sys->b_strict = var_CreateGetBool( p_sd, "sap-strict");
306 p_sys->b_parse = var_CreateGetBool( p_sd, "sap-parse" );
308 p_sys->i_announces = 0;
309 p_sys->pp_announces = NULL;
310 /* TODO: create sockets here, and fix racy sockets table */
311 if (vlc_clone (&p_sys->thread, Run, p_sd, VLC_THREAD_PRIORITY_LOW))
320 /*****************************************************************************
321 * OpenDemux: initialize and create stuff
322 *****************************************************************************/
323 static int OpenDemux( vlc_object_t *p_this )
325 demux_t *p_demux = (demux_t *)p_this;
326 const uint8_t *p_peek;
327 char *psz_sdp = NULL;
329 int errval = VLC_EGENERIC;
332 if( !var_CreateGetBool( p_demux, "sap-parse" ) )
334 /* We want livedotcom module to parse this SDP file */
338 assert( p_demux->s ); /* this is NOT an access_demux */
341 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
344 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
347 /* Gather the complete sdp file */
348 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
350 const int i_read_max = 1024;
351 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
353 if( psz_sdp_new == NULL )
358 psz_sdp = psz_sdp_new;
360 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
361 if( (int)i_read < 0 )
363 msg_Err( p_demux, "cannot read SDP" );
368 psz_sdp[i_len] = '\0';
370 if( (int)i_read < i_read_max )
374 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
378 msg_Warn( p_demux, "invalid SDP");
382 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
384 p_sdp->psz_uri = NULL;
386 if (!IsWellKnownPayload (p_sdp->i_media_type))
388 if( p_sdp->psz_uri == NULL ) goto error;
390 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
391 if( unlikely( !p_demux->p_sys ) )
393 p_demux->p_sys->p_sdp = p_sdp;
394 p_demux->pf_control = Control;
395 p_demux->pf_demux = Demux;
402 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
403 stream_Seek( p_demux->s, 0 );
407 /*****************************************************************************
409 *****************************************************************************/
410 static void Close( vlc_object_t *p_this )
412 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
413 services_discovery_sys_t *p_sys = p_sd->p_sys;
416 vlc_cancel (p_sys->thread);
417 vlc_join (p_sys->thread, NULL);
419 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
421 net_Close( p_sys->pi_fd[i] );
423 FREENULL( p_sys->pi_fd );
425 for( i = p_sys->i_announces - 1; i>= 0; i-- )
427 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
429 FREENULL( p_sys->pp_announces );
434 /*****************************************************************************
435 * CloseDemux: Close the demuxer
436 *****************************************************************************/
437 static void CloseDemux( vlc_object_t *p_this )
439 demux_t *p_demux = (demux_t *)p_this;
441 if( p_demux->p_sys->p_sdp )
442 FreeSDP( p_demux->p_sys->p_sdp );
443 free( p_demux->p_sys );
446 /*****************************************************************************
447 * Run: main SAP thread
448 *****************************************************************************
449 * Listens to SAP packets, and sends them to packet_handle
450 *****************************************************************************/
451 #define MAX_SAP_BUFFER 5000
453 static void *Run( void *data )
455 services_discovery_t *p_sd = data;
459 int canc = vlc_savecancel ();
461 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
462 * DNS queries, even if the DNS server returns an error with milliseconds.
463 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
464 * Winsock 1.1 from Windows 95, if not Windows 3.1.
465 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
466 * we have to open sockets in Run() rather than Open(). */
467 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
468 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
469 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
470 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
472 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
474 struct if_nameindex *l = if_nameindex ();
477 char *ptr = strchr (psz_address, '%') + 1;
478 for (unsigned i = 0; l[i].if_index; i++)
480 strcpy (ptr, l[i].if_name);
481 InitSocket (p_sd, psz_address, SAP_PORT);
483 if_freenameindex (l);
486 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
487 which if_nameindex uses internally anyway */
489 // first create a dummy socket to pin down the protocol family
490 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
491 if( s != INVALID_SOCKET )
493 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
494 DWORD len = sizeof(ifaces);
496 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
498 unsigned ifcount = len/sizeof(INTERFACE_INFO);
499 char *ptr = strchr (psz_address, '%') + 1;
500 for(unsigned i = 1; i<=ifcount; ++i )
502 // append link-local zone identifier
503 sprintf(ptr, "%d", i);
509 *strchr (psz_address, '%') = '\0';
511 static const char ipv6_scopes[] = "1456789ABCDE";
512 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
514 psz_address[3] = *c_scope;
515 InitSocket( p_sd, psz_address, SAP_PORT );
518 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
519 if( psz_addr && *psz_addr )
520 InitSocket( p_sd, psz_addr, SAP_PORT );
523 if( p_sd->p_sys->i_fd == 0 )
525 msg_Err( p_sd, "unable to listen on any address" );
529 /* read SAP packets */
532 vlc_restorecancel (canc);
533 unsigned n = p_sd->p_sys->i_fd;
534 struct pollfd ufd[n];
536 for (unsigned i = 0; i < n; i++)
538 ufd[i].fd = p_sd->p_sys->pi_fd[i];
539 ufd[i].events = POLLIN;
543 int val = poll (ufd, n, timeout);
544 canc = vlc_savecancel ();
547 for (unsigned i = 0; i < n; i++)
551 uint8_t p_buffer[MAX_SAP_BUFFER+1];
554 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
555 MAX_SAP_BUFFER, false);
557 msg_Warn (p_sd, "receive error: %m");
560 /* Parse the packet */
561 p_buffer[i_read] = '\0';
562 ParseSAP (p_sd, p_buffer, i_read);
568 mtime_t now = mdate();
570 /* A 1 hour timeout correspong to the RFC Implicit timeout.
571 * This timeout is tuned in the following loop. */
572 timeout = 1000 * 60 * 60;
574 /* Check for items that need deletion */
575 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
577 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
578 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
579 mtime_t i_last_period = now - p_announce->i_last;
581 /* Remove the annoucement, if the last announcement was 1 hour ago
582 * or if the last packet emitted was 3 times the average time
583 * between two packets */
584 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
585 i_last_period > i_timeout )
587 RemoveAnnounce( p_sd, p_announce );
591 /* Compute next timeout */
592 if( p_announce->i_period_trust > 5 )
593 timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
594 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
598 if( !p_sd->p_sys->i_announces )
599 timeout = -1; /* We can safely poll indefinitely. */
600 else if( timeout < 200 )
601 timeout = 200; /* Don't wakeup too fast. */
606 /**********************************************************************
607 * Demux: reads and demuxes data packets
608 * Return -1 if error, 0 if EOF, 1 else
609 **********************************************************************/
610 static int Demux( demux_t *p_demux )
612 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
613 input_thread_t *p_input;
614 input_item_t *p_parent_input;
616 p_input = demux_GetParentInput( p_demux );
620 msg_Err( p_demux, "parent input could not be found" );
624 /* This item hasn't been held by input_GetItem
625 * don't release it */
626 p_parent_input = input_GetItem( p_input );
628 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
629 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
630 if( p_sdp->rtcp_port )
633 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
635 input_item_AddOption( p_parent_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
640 vlc_mutex_lock( &p_parent_input->lock );
642 p_parent_input->i_type = ITEM_TYPE_NET;
644 vlc_mutex_unlock( &p_parent_input->lock );
645 vlc_object_release( p_input );
649 static int Control( demux_t *p_demux, int i_query, va_list args )
651 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
655 /**************************************************************
657 **************************************************************/
659 /* i_read is at least > 6 */
660 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
665 const uint8_t *end = buf + len;
667 uint32_t i_source[4];
669 assert (buf[len] == '\0');
674 uint8_t flags = buf[0];
675 uint8_t auth_len = buf[1];
677 /* First, check the sap announce is correct */
678 if ((flags >> 5) != 1)
681 bool b_ipv6 = (flags & 0x10) != 0;
682 bool b_need_delete = (flags & 0x04) != 0;
686 msg_Dbg( p_sd, "encrypted packet, unsupported" );
690 bool b_compressed = (flags & 0x01) != 0;
692 uint16_t i_hash = U16_AT (buf + 2);
694 if( p_sd->p_sys->b_strict && i_hash == 0 )
696 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
703 for( int i = 0; i < 4; i++,buf+=4)
704 i_source[i] = U32_AT(buf);
708 memset(i_source, 0, sizeof(i_source));
709 i_source[3] = U32_AT(buf);
717 uint8_t *decomp = NULL;
720 int newsize = Decompress (buf, &decomp, end - buf);
723 msg_Dbg( p_sd, "decompression of SAP packet failed" );
727 decomp = realloc (decomp, newsize + 1);
728 decomp[newsize] = '\0';
729 psz_sdp = (const char *)decomp;
734 psz_sdp = (const char *)buf;
738 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
739 assert( psz_sdp[len] == '\0');
741 /* Skip payload type */
742 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
743 if (strncmp (psz_sdp, "v=0", 3))
745 size_t clen = strlen (psz_sdp) + 1;
747 if (strcmp (psz_sdp, "application/sdp"))
749 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
753 // skips content type
762 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
767 p_sdp->psz_sdp = psz_sdp;
769 /* Decide whether we should add a playlist item for this SDP */
770 /* Parse connection information (c= & m= ) */
771 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
772 p_sdp->psz_uri = NULL;
774 /* Multi-media or no-parse -> pass to LIVE.COM */
775 if( !IsWellKnownPayload( p_sdp->i_media_type ) || !p_sd->p_sys->b_parse )
777 free( p_sdp->psz_uri );
778 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
779 p_sdp->psz_uri = NULL;
782 if( p_sdp->psz_uri == NULL )
788 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
790 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
792 if( ( !i_hash && IsSameSession( p_announce->p_sdp, p_sdp ) )
793 || ( i_hash && p_announce->i_hash == i_hash
794 && !memcmp(p_announce->i_source, i_source, sizeof(i_source)) ) )
796 /* We don't support delete announcement as they can easily
797 * Be used to highjack an announcement by a third party.
798 * Intead we cleverly implement Implicit Announcement removal.
800 * if( b_need_delete )
801 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
807 /* No need to go after six, as we start to trust the
808 * average period at six */
809 if( p_announce->i_period_trust <= 5 )
810 p_announce->i_period_trust++;
812 /* Compute the average period */
813 mtime_t now = mdate();
814 p_announce->i_period = (p_announce->i_period + (now - p_announce->i_last)) / 2;
815 p_announce->i_last = now;
817 FreeSDP( p_sdp ); p_sdp = NULL;
822 CreateAnnounce( p_sd, i_source, i_hash, p_sdp );
828 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint32_t *i_source, uint16_t i_hash,
831 input_item_t *p_input;
832 const char *psz_value;
833 sap_announce_t *p_sap = (sap_announce_t *)malloc(
834 sizeof(sap_announce_t ) );
835 services_discovery_sys_t *p_sys;
841 p_sap->i_last = mdate();
843 p_sap->i_period_trust = 0;
844 p_sap->i_hash = i_hash;
845 memcpy (p_sap->i_source, i_source, sizeof(p_sap->i_source));
846 p_sap->p_sdp = p_sdp;
848 /* Released in RemoveAnnounce */
849 p_input = input_item_NewWithType( p_sap->p_sdp->psz_uri,
850 p_sdp->psz_sessionname,
851 0, NULL, 0, -1, ITEM_TYPE_NET );
852 p_sap->p_item = p_input;
859 if( p_sdp->rtcp_port )
862 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
864 input_item_AddOption( p_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
869 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
870 if( psz_value != NULL )
872 input_item_AddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
874 if( strcmp( p_sdp->username, "-" ) )
876 input_item_AddInfo( p_input, _("Session"), _("User"), "%s",
880 /* Handle category */
881 psz_value = GetAttribute(p_sap->p_sdp->pp_attributes,
882 p_sap->p_sdp->i_attributes, "cat");
883 if (psz_value != NULL)
885 /* a=cat provides a dot-separated hierarchy.
886 * For the time being only replace dots with pipe. TODO: FIXME */
887 char *str = strdup(psz_value);
888 if (likely(str != NULL))
889 for (char *p = strchr(str, '.'); p != NULL; p = strchr(p, '.'))
891 services_discovery_AddItem(p_sd, p_input, str ? str : psz_value);
896 /* backward compatibility with VLC 0.7.3-2.0.0 senders */
897 psz_value = GetAttribute(p_sap->p_sdp->pp_attributes,
898 p_sap->p_sdp->i_attributes, "x-plgroup");
899 services_discovery_AddItem(p_sd, p_input, psz_value);
902 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
908 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
911 /* Look for media attribute, and fallback to session */
912 const char *attr = GetAttribute (sdp->mediav[media].pp_attributes,
913 sdp->mediav[media].i_attributes, name);
915 attr = GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
920 /* Fill p_sdp->psz_uri */
921 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
923 if (p_sdp->mediac == 0)
925 msg_Dbg (p_obj, "Ignoring SDP with no media");
929 for (unsigned i = 1; i < p_sdp->mediac; i++)
931 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
932 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
933 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
934 p_sdp->mediav->addrlen))
936 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
941 if (p_sdp->mediav->n_addr != 1)
943 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
952 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
953 p_sdp->mediav->addrlen, psz_uri + 1,
954 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
957 if (strchr (psz_uri + 1, ':'))
960 strcat (psz_uri, "]");
966 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
967 if (sdp_proto == NULL)
970 char *subtype = strchr (sdp_proto, ' ');
973 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
980 /* FIXME: check for multiple payload types in RTP/AVP case.
981 * FIXME: check for "mpeg" subtype in raw udp case. */
982 if (!strcasecmp (sdp_proto, "udp"))
983 p_sdp->i_media_type = 33;
985 p_sdp->i_media_type = atoi (subtype);
988 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
989 * 0x1: Connection-Oriented media. */
990 static const char proto_match[] =
992 "RTP/AVP\0" "rtp\0\0"
993 "UDPLite/RTP/AVP\0" "udplite\0\0"
994 "DCCP/RTP/AVP\0" "dccp\0\1"
995 "TCP/RTP/AVP\0" "rtptcp\0\1"
998 const char *vlc_proto = NULL;
1000 for (const char *proto = proto_match; *proto;)
1002 if (strcasecmp (proto, sdp_proto) == 0)
1004 vlc_proto = proto + strlen (proto) + 1;
1005 flags = vlc_proto[strlen (vlc_proto) + 1];
1008 proto += strlen (proto) + 1;
1009 proto += strlen (proto) + 2;
1013 if (vlc_proto == NULL)
1015 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
1016 p_sdp->mediav[0].fmt);
1017 return VLC_EGENERIC;
1020 if (!strcmp (vlc_proto, "udp") || FindAttribute (p_sdp, 0, "rtcp-mux"))
1021 p_sdp->rtcp_port = 0;
1024 const char *rtcp = FindAttribute (p_sdp, 0, "rtcp");
1026 p_sdp->rtcp_port = atoi (rtcp);
1028 if (port & 1) /* odd port -> RTCP; next even port -> RTP */
1029 p_sdp->rtcp_port = port++;
1030 else /* even port -> RTP; next odd port -> RTCP */
1031 p_sdp->rtcp_port = port + 1;
1036 /* Connection-oriented media */
1037 const char *setup = FindAttribute (p_sdp, 0, "setup");
1039 setup = "active"; /* default value */
1041 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
1043 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1044 return VLC_EGENERIC;
1047 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1053 /* Non-connected (normally multicast) media */
1054 char psz_source[258] = "";
1055 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1056 if (sfilter != NULL)
1058 char psz_source_ip[256];
1061 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1062 psz_source_ip) == 2)
1064 /* According to RFC4570, FQDNs can be used for source-filters,
1065 * but -seriously- this is impractical */
1071 struct in6_addr addr;
1072 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1073 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1074 sizeof (psz_source) - 2) != NULL))
1076 psz_source[0] = '[';
1077 psz_source[strlen (psz_source)] = ']';
1084 struct in_addr addr;
1085 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1086 && (inet_ntop (AF_INET, &addr, psz_source,
1087 sizeof (psz_source)) == NULL))
1095 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1104 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1105 socklen_t *addrlen, unsigned *number)
1108 unsigned fam, n1, n2;
1110 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1118 addr->ss_family = AF_INET6;
1122 *addrlen = sizeof (struct sockaddr_in6);
1124 if (inet_pton (AF_INET6, host,
1125 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1128 *number = (res >= 3) ? n1 : 1;
1133 addr->ss_family = AF_INET;
1137 *addrlen = sizeof (struct sockaddr_in);
1139 if (inet_pton (AF_INET, host,
1140 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1143 *number = (res >= 4) ? n2 : 1;
1153 /***********************************************************************
1154 * ParseSDP : SDP parsing
1155 * *********************************************************************
1156 * Validate SDP and parse all fields
1157 ***********************************************************************/
1158 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1160 if( psz_sdp == NULL )
1163 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1168 struct sockaddr_storage glob_addr;
1169 memset (&glob_addr, 0, sizeof (glob_addr));
1170 socklen_t glob_len = 0;
1171 unsigned glob_count = 1;
1174 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1177 /* Extract one line */
1178 char *eol = strchr (psz_sdp, '\n');
1179 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1180 char line[linelen + 1];
1181 memcpy (line, psz_sdp, linelen);
1182 line[linelen] = '\0';
1184 psz_sdp += linelen + 1;
1186 /* Remove carriage return if present */
1187 eol = strchr (line, '\r');
1190 linelen = eol - line;
1191 line[linelen] = '\0';
1195 char cat = line[0], *data = line + 2;
1196 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1198 /* MUST ignore SDP with unknown line type */
1199 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1204 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1208 assert (linelen >= 2);
1210 /* SDP parsing state machine
1211 * We INTERNALLY use uppercase for session, lowercase for media
1215 /* Session description */
1220 msg_Dbg (p_obj, "missing SDP version");
1223 if (strcmp (data, "0"))
1225 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1235 msg_Dbg (p_obj, "missing SDP originator");
1239 if ((sscanf (data, "%63s %"SCNu64" %"SCNu64" IN IP%u %1023s",
1240 p_sdp->username, &p_sdp->session_id,
1241 &p_sdp->session_version, &p_sdp->orig_ip_version,
1242 p_sdp->orig_host) != 5)
1243 || ((p_sdp->orig_ip_version != 4)
1244 && (p_sdp->orig_ip_version != 6)))
1246 msg_Dbg (p_obj, "SDP origin not supported: %s", data);
1247 /* Or maybe out-of-range, but this looks suspicious */
1250 EnsureUTF8 (p_sdp->orig_host);
1257 if ((cat != 's') || !*data)
1259 /* MUST be present AND non-empty */
1260 msg_Dbg (p_obj, "missing SDP session name");
1263 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1264 p_sdp->psz_sessionname = strdup (data);
1265 if (p_sdp->psz_sessionname == NULL)
1267 EnsureUTF8 (p_sdp->psz_sessionname);
1291 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1294 msg_Dbg (p_obj, "SDP connection infos not supported: "
1301 assert (expect == 'B');
1308 msg_Dbg (p_obj, "missing SDP time description");
1314 if ((cat == 't') || (cat == 'r'))
1329 attribute_t *p_attr = MakeAttribute (data);
1330 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1334 /* Media description */
1341 msg_Dbg (p_obj, "missing SDP media description");
1344 struct sdp_media_t *m;
1345 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1353 memset (m, 0, sizeof (*m));
1354 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1355 m->n_addr = glob_count;
1357 /* TODO: remember media type (if we need multiple medias) */
1358 data = strchr (data, ' ');
1361 msg_Dbg (p_obj, "missing SDP media port");
1364 port = atoi (++data);
1365 if (port <= 0 || port >= 65536)
1367 msg_Dbg (p_obj, "invalid transport port %d", port);
1370 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1372 data = strchr (data, ' ');
1375 msg_Dbg (p_obj, "missing SDP media format");
1378 m->fmt = strdup (++data);
1392 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1393 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1396 msg_Dbg (p_obj, "SDP connection infos not supported: "
1400 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1412 assert (expect == 'a');
1415 attribute_t *p_attr = MakeAttribute (data);
1419 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1420 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1429 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1435 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1447 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1450 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1452 return VLC_EGENERIC;
1454 shutdown( i_fd, SHUT_WR );
1455 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1456 p_sd->p_sys->i_fd, i_fd);
1460 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1463 int i_result, i_dstsize, n = 0;
1464 unsigned char *psz_dst = NULL;
1467 memset (&d_stream, 0, sizeof (d_stream));
1469 i_result = inflateInit(&d_stream);
1470 if( i_result != Z_OK )
1473 d_stream.next_in = (Bytef *)psz_src;
1474 d_stream.avail_in = i_len;
1479 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1480 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1481 d_stream.avail_out = 1000;
1483 i_result = inflate(&d_stream, Z_NO_FLUSH);
1484 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1486 inflateEnd( &d_stream );
1491 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1492 ( i_result != Z_STREAM_END ) );
1494 i_dstsize = d_stream.total_out;
1495 inflateEnd( &d_stream );
1497 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1509 static void FreeSDP( sdp_t *p_sdp )
1511 free( p_sdp->psz_sessionname );
1512 free( p_sdp->psz_uri );
1514 for (unsigned j = 0; j < p_sdp->mediac; j++)
1516 free (p_sdp->mediav[j].fmt);
1517 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1518 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1519 free (p_sdp->mediav[j].pp_attributes);
1521 free (p_sdp->mediav);
1523 for (int i = 0; i < p_sdp->i_attributes; i++)
1524 FreeAttribute (p_sdp->pp_attributes[i]);
1526 free (p_sdp->pp_attributes);
1530 static int RemoveAnnounce( services_discovery_t *p_sd,
1531 sap_announce_t *p_announce )
1535 if( p_announce->p_sdp )
1537 FreeSDP( p_announce->p_sdp );
1538 p_announce->p_sdp = NULL;
1541 if( p_announce->p_item )
1543 services_discovery_RemoveItem( p_sd, p_announce->p_item );
1544 vlc_gc_decref( p_announce->p_item );
1545 p_announce->p_item = NULL;
1548 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1550 if( p_sd->p_sys->pp_announces[i] == p_announce )
1552 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1564 * Compare two sessions, when hash is not set (SAP v0)
1566 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1568 /* A session is identified by
1571 * - network type (which is always IN),
1572 * - address type (currently, this means IP version),
1575 if (strcmp (p_sdp1->username, p_sdp2->username)
1576 || (p_sdp1->session_id != p_sdp2->session_id)
1577 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1578 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1584 static inline attribute_t *MakeAttribute (const char *str)
1586 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1590 strcpy (a->name, str);
1591 EnsureUTF8 (a->name);
1592 char *value = strchr (a->name, ':');
1604 static const char *GetAttribute (attribute_t **tab, unsigned n,
1607 for (unsigned i = 0; i < n; i++)
1608 if (strcasecmp (tab[i]->name, name) == 0)
1609 return tab[i]->value;
1614 static inline void FreeAttribute (attribute_t *a)