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_SYS_TIME_H
47 # include <sys/time.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_IPV4_TEXT N_( "IPv4 SAP" )
87 #define SAP_IPV4_LONGTEXT N_( \
88 "Listen to IPv4 announcements on the standard addresses." )
89 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
90 #define SAP_IPV6_LONGTEXT N_( \
91 "Listen to IPv6 announcements on the standard addresses." )
92 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
93 #define SAP_SCOPE_LONGTEXT N_( \
94 "Scope for IPv6 announcements (default is 8)." )
95 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
96 #define SAP_TIMEOUT_LONGTEXT N_( \
97 "Delay after which SAP items get deleted if no new announcement " \
99 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
100 #define SAP_PARSE_LONGTEXT N_( \
101 "This enables actual parsing of the announces by the SAP module. " \
102 "Otherwise, all announcements are parsed by the \"live555\" " \
103 "(RTP/RTSP) module." )
104 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
105 #define SAP_STRICT_LONGTEXT N_( \
106 "When this is set, the SAP parser will discard some non-compliant " \
108 #define SAP_CACHE_TEXT N_("Use SAP cache")
109 #define SAP_CACHE_LONGTEXT N_( \
110 "This enables a SAP caching mechanism. " \
111 "This will result in lower SAP startup time, but you could end up " \
112 "with items corresponding to legacy streams." )
115 static int Open ( vlc_object_t * );
116 static void Close( vlc_object_t * );
117 static int OpenDemux ( vlc_object_t * );
118 static void CloseDemux ( vlc_object_t * );
120 VLC_SD_PROBE_HELPER("sap", N_("Network streams (SAP)"))
123 set_shortname( N_("SAP"))
124 set_description( N_("SAP Announcements") )
125 set_category( CAT_PLAYLIST )
126 set_subcategory( SUBCAT_PLAYLIST_SD )
128 add_string( "sap-addr", NULL, NULL,
129 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, true )
130 add_bool( "sap-ipv4", true, NULL,
131 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, true )
132 add_bool( "sap-ipv6", true, NULL,
133 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, true )
134 add_integer( "sap-timeout", 1800, NULL,
135 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, true )
136 add_bool( "sap-parse", true, NULL,
137 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, true )
138 add_bool( "sap-strict", false, NULL,
139 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, true )
141 add_bool( "sap-cache", false, NULL,
142 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, true )
144 add_obsolete_bool( "sap-timeshift" ) /* Redumdant since 1.0.0 */
146 set_capability( "services_discovery", 0 )
147 set_callbacks( Open, Close )
149 VLC_SD_PROBE_SUBMODULE
152 set_description( N_("SDP Descriptions parser") )
153 add_shortcut( "sdp" )
154 set_capability( "demux", 51 )
155 set_callbacks( OpenDemux, CloseDemux )
159 /*****************************************************************************
161 *****************************************************************************/
163 typedef struct sdp_t sdp_t;
164 typedef struct attribute_t attribute_t;
165 typedef struct sap_announce_t sap_announce_t;
170 struct sdp_t *parent;
172 struct sockaddr_storage addr;
176 attribute_t **pp_attributes;
180 /* The structure that contains sdp information */
188 uint64_t session_version;
189 unsigned orig_ip_version;
190 char orig_host[1024];
193 char *psz_sessionname;
201 /* a= global attributes */
203 attribute_t **pp_attributes;
205 /* medias (well, we only support one atm) */
207 struct sdp_media_t *mediav;
216 struct sap_announce_t
220 uint8_t i_period_trust;
223 uint32_t i_source[4];
225 /* SAP annnounces must only contain one SDP */
228 input_item_t * p_item;
231 struct services_discovery_sys_t
235 /* Socket descriptors */
239 /* Table of announces */
241 struct sap_announce_t **pp_announces;
255 /*****************************************************************************
257 *****************************************************************************/
261 static int Demux( demux_t *p_demux );
262 static int Control( demux_t *, int, va_list );
263 static void *Run ( void *p_sd );
265 /* Main parsing functions */
266 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
267 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
268 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
269 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
270 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
272 /* Helper functions */
273 static inline attribute_t *MakeAttribute (const char *str);
274 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
275 static inline void FreeAttribute (attribute_t *a);
276 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
279 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
280 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
281 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
282 static void FreeSDP( sdp_t *p_sdp );
284 static inline int min_int( int a, int b )
286 return a > b ? b : a;
289 static bool IsWellKnownPayload (int type)
292 { /* Should be in sync with modules/demux/rtp.c */
293 case 0: /* PCMU/8000 */
295 case 8: /* PCMA/8000 */
296 case 10: /* L16/44100/2 */
297 case 11: /* L16/44100 */
299 case 14: /* MPA/90000 */
300 case 32: /* MPV/90000 */
301 case 33: /* MP2/90000 */
307 /*****************************************************************************
308 * Open: initialize and create stuff
309 *****************************************************************************/
310 static int Open( vlc_object_t *p_this )
312 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
313 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
314 malloc( sizeof( services_discovery_sys_t ) );
318 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
325 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
326 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
329 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
335 p_sys->i_announces = 0;
336 p_sys->pp_announces = NULL;
337 /* TODO: create sockets here, and fix racy sockets table */
338 if (vlc_clone (&p_sys->thread, Run, p_sd, VLC_THREAD_PRIORITY_LOW))
347 /*****************************************************************************
348 * OpenDemux: initialize and create stuff
349 *****************************************************************************/
350 static int OpenDemux( vlc_object_t *p_this )
352 demux_t *p_demux = (demux_t *)p_this;
353 const uint8_t *p_peek;
354 char *psz_sdp = NULL;
356 int errval = VLC_EGENERIC;
359 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
361 /* We want livedotcom module to parse this SDP file */
365 assert( p_demux->s ); /* this is NOT an access_demux */
368 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
371 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
374 /* Gather the complete sdp file */
375 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
377 const int i_read_max = 1024;
378 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
380 if( psz_sdp_new == NULL )
385 psz_sdp = psz_sdp_new;
387 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
388 if( (int)i_read < 0 )
390 msg_Err( p_demux, "cannot read SDP" );
395 psz_sdp[i_len] = '\0';
397 if( (int)i_read < i_read_max )
401 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
405 msg_Warn( p_demux, "invalid SDP");
409 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
411 p_sdp->psz_uri = NULL;
413 if (!IsWellKnownPayload (p_sdp->i_media_type))
415 if( p_sdp->psz_uri == NULL ) goto error;
417 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
418 if( unlikely( !p_demux->p_sys ) )
420 p_demux->p_sys->p_sdp = p_sdp;
421 p_demux->pf_control = Control;
422 p_demux->pf_demux = Demux;
429 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
430 stream_Seek( p_demux->s, 0 );
434 /*****************************************************************************
436 *****************************************************************************/
437 static void Close( vlc_object_t *p_this )
439 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
440 services_discovery_sys_t *p_sys = p_sd->p_sys;
443 vlc_cancel (p_sys->thread);
444 vlc_join (p_sys->thread, NULL);
446 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
448 net_Close( p_sys->pi_fd[i] );
450 FREENULL( p_sys->pi_fd );
453 if( config_GetInt( p_sd, "sap-cache" ) )
459 for( i = p_sys->i_announces - 1; i>= 0; i-- )
461 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
463 FREENULL( p_sys->pp_announces );
468 /*****************************************************************************
469 * CloseDemux: Close the demuxer
470 *****************************************************************************/
471 static void CloseDemux( vlc_object_t *p_this )
473 demux_t *p_demux = (demux_t *)p_this;
475 if( p_demux->p_sys->p_sdp )
476 FreeSDP( p_demux->p_sys->p_sdp );
477 free( p_demux->p_sys );
480 /*****************************************************************************
481 * Run: main SAP thread
482 *****************************************************************************
483 * Listens to SAP packets, and sends them to packet_handle
484 *****************************************************************************/
485 #define MAX_SAP_BUFFER 5000
487 static void *Run( void *data )
489 services_discovery_t *p_sd = data;
493 int canc = vlc_savecancel ();
495 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
496 * DNS queries, even if the DNS server returns an error with milliseconds.
497 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
498 * Winsock 1.1 from Windows 95, if not Windows 3.1.
499 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
500 * we have to open sockets in Run() rather than Open(). */
501 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
503 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
504 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
505 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
506 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
508 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
510 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
513 struct if_nameindex *l = if_nameindex ();
516 char *ptr = strchr (psz_address, '%') + 1;
517 for (unsigned i = 0; l[i].if_index; i++)
519 strcpy (ptr, l[i].if_name);
520 InitSocket (p_sd, psz_address, SAP_PORT);
522 if_freenameindex (l);
525 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
526 which if_nameindex uses internally anyway */
528 // first create a dummy socket to pin down the protocol family
529 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
530 if( s != INVALID_SOCKET )
532 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
533 size_t len = sizeof(ifaces);
535 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
537 unsigned ifcount = len/sizeof(INTERFACE_INFO);
538 char *ptr = strchr (psz_address, '%') + 1;
539 for(unsigned i = 1; i<=ifcount; ++i )
541 // append link-local zone identifier
542 sprintf(ptr, "%d", i);
548 *strchr (psz_address, '%') = '\0';
550 static const char ipv6_scopes[] = "1456789ABCDE";
551 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
553 psz_address[3] = *c_scope;
554 InitSocket( p_sd, psz_address, SAP_PORT );
558 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
559 if( psz_addr && *psz_addr )
560 InitSocket( p_sd, psz_addr, SAP_PORT );
563 if( p_sd->p_sys->i_fd == 0 )
565 msg_Err( p_sd, "unable to listen on any address" );
569 /* read SAP packets */
572 vlc_restorecancel (canc);
573 unsigned n = p_sd->p_sys->i_fd;
574 struct pollfd ufd[n];
576 for (unsigned i = 0; i < n; i++)
578 ufd[i].fd = p_sd->p_sys->pi_fd[i];
579 ufd[i].events = POLLIN;
583 int val = poll (ufd, n, timeout);
584 canc = vlc_savecancel ();
587 for (unsigned i = 0; i < n; i++)
591 uint8_t p_buffer[MAX_SAP_BUFFER+1];
594 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
595 MAX_SAP_BUFFER, false);
597 msg_Warn (p_sd, "receive error: %m");
600 /* Parse the packet */
601 p_buffer[i_read] = '\0';
602 ParseSAP (p_sd, p_buffer, i_read);
608 mtime_t now = mdate();
610 /* A 1 hour timeout correspong to the RFC Implicit timeout.
611 * This timeout is tuned in the following loop. */
612 timeout = 1000 * 60 * 60;
614 /* Check for items that need deletion */
615 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
617 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
618 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
619 mtime_t i_last_period = now - p_announce->i_last;
621 /* Remove the annoucement, if the last announcement was 1 hour ago
622 * or if the last packet emitted was 3 times the average time
623 * between two packets */
624 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
625 i_last_period > i_timeout )
627 RemoveAnnounce( p_sd, p_announce );
631 /* Compute next timeout */
632 if( p_announce->i_period_trust > 5 )
633 timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
634 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
638 if( !p_sd->p_sys->i_announces )
639 timeout = -1; /* We can safely poll indefinitly. */
640 else if( timeout < 200 )
641 timeout = 200; /* Don't wakeup too fast. */
646 /**********************************************************************
647 * Demux: reads and demuxes data packets
648 * Return -1 if error, 0 if EOF, 1 else
649 **********************************************************************/
650 static int Demux( demux_t *p_demux )
652 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
653 input_thread_t *p_input;
654 input_item_t *p_parent_input;
656 p_input = demux_GetParentInput( p_demux );
660 msg_Err( p_demux, "parent input could not be found" );
664 /* This item hasn't been held by input_GetItem
665 * don't release it */
666 p_parent_input = input_GetItem( p_input );
668 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
669 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
670 if( p_sdp->rtcp_port )
673 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
675 input_item_AddOption( p_parent_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
680 vlc_mutex_lock( &p_parent_input->lock );
682 p_parent_input->i_type = ITEM_TYPE_NET;
684 vlc_mutex_unlock( &p_parent_input->lock );
685 vlc_object_release( p_input );
689 static int Control( demux_t *p_demux, int i_query, va_list args )
691 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
695 /**************************************************************
697 **************************************************************/
699 /* i_read is at least > 6 */
700 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
705 const uint8_t *end = buf + len;
708 assert (buf[len] == '\0');
713 uint8_t flags = buf[0];
715 /* First, check the sap announce is correct */
716 if ((flags >> 5) != 1)
719 bool b_ipv6 = (flags & 0x10) != 0;
720 bool b_need_delete = (flags & 0x04) != 0;
724 msg_Dbg( p_sd, "encrypted packet, unsupported" );
728 bool b_compressed = (flags & 0x01) != 0;
730 uint16_t i_hash = U16_AT (buf + 2);
732 if( p_sd->p_sys->b_strict && i_hash == 0 )
734 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
738 // Skips source address and auth data
739 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
743 uint8_t *decomp = NULL;
746 int newsize = Decompress (buf, &decomp, end - buf);
749 msg_Dbg( p_sd, "decompression of SAP packet failed" );
753 decomp = realloc (decomp, newsize + 1);
754 decomp[newsize] = '\0';
755 psz_sdp = (const char *)decomp;
760 psz_sdp = (const char *)buf;
764 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
765 assert( psz_sdp[len] == '\0');
767 /* Skip payload type */
768 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
769 if (strncmp (psz_sdp, "v=0", 3))
771 size_t clen = strlen (psz_sdp) + 1;
773 if (strcmp (psz_sdp, "application/sdp"))
775 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
779 // skips content type
788 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
793 p_sdp->psz_sdp = psz_sdp;
795 /* Decide whether we should add a playlist item for this SDP */
796 /* Parse connection information (c= & m= ) */
797 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
798 p_sdp->psz_uri = NULL;
800 /* Multi-media or no-parse -> pass to LIVE.COM */
801 if( !IsWellKnownPayload( p_sdp->i_media_type ) || !p_sd->p_sys->b_parse )
803 free( p_sdp->psz_uri );
804 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
805 p_sdp->psz_uri = NULL;
808 if( p_sdp->psz_uri == NULL )
814 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
816 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
818 /* FIXME: we create a new announce each time the sdp changes */
819 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
821 /* We don't support delete announcement as they can easily
822 * Be used to highjack an announcement by a third party.
823 * Intead we cleverly implement Implicit Announcement removal.
825 * if( b_need_delete )
826 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
832 /* No need to go after six, as we start to trust the
833 * average period at six */
834 if( p_announce->i_period_trust <= 5 )
835 p_announce->i_period_trust++;
837 /* Compute the average period */
838 mtime_t now = mdate();
839 p_announce->i_period = (p_announce->i_period + (now - p_announce->i_last)) / 2;
840 p_announce->i_last = now;
842 FreeSDP( p_sdp ); p_sdp = NULL;
847 CreateAnnounce( p_sd, i_hash, p_sdp );
853 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
856 input_item_t *p_input;
857 const char *psz_value;
858 sap_announce_t *p_sap = (sap_announce_t *)malloc(
859 sizeof(sap_announce_t ) );
860 services_discovery_sys_t *p_sys;
866 p_sap->i_last = mdate();
868 p_sap->i_period_trust = 0;
869 p_sap->i_hash = i_hash;
870 p_sap->p_sdp = p_sdp;
872 /* Released in RemoveAnnounce */
873 p_input = input_item_NewWithType( VLC_OBJECT(p_sd),
874 p_sap->p_sdp->psz_uri,
875 p_sdp->psz_sessionname,
876 0, NULL, 0, -1, ITEM_TYPE_NET );
877 p_sap->p_item = p_input;
884 if( p_sdp->rtcp_port )
887 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
889 input_item_AddOption( p_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
894 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
895 if( psz_value != NULL )
897 input_item_AddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
899 if( strcmp( p_sdp->username, "-" ) )
901 input_item_AddInfo( p_input, _("Session"), _("User"), "%s",
906 if (p_sap->p_sdp->mediac >= 1)
907 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
909 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
911 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
913 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
919 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
922 /* Look for media attribute, and fallback to session */
923 const char *attr = GetAttribute (sdp->mediav[media].pp_attributes,
924 sdp->mediav[media].i_attributes, name);
926 attr = GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
931 /* Fill p_sdp->psz_uri */
932 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
934 if (p_sdp->mediac == 0)
936 msg_Dbg (p_obj, "Ignoring SDP with no media");
940 for (unsigned i = 1; i < p_sdp->mediac; i++)
942 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
943 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
944 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
945 p_sdp->mediav->addrlen))
947 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
952 if (p_sdp->mediav->n_addr != 1)
954 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
963 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
964 p_sdp->mediav->addrlen, psz_uri + 1,
965 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
968 if (strchr (psz_uri + 1, ':'))
971 strcat (psz_uri, "]");
977 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
978 if (sdp_proto == NULL)
981 char *subtype = strchr (sdp_proto, ' ');
984 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
991 /* FIXME: check for multiple payload types in RTP/AVP case.
992 * FIXME: check for "mpeg" subtype in raw udp case. */
993 if (!strcasecmp (sdp_proto, "udp"))
994 p_sdp->i_media_type = 33;
996 p_sdp->i_media_type = atoi (subtype);
999 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
1000 * 0x1: Connection-Oriented media. */
1001 static const char proto_match[] =
1003 "RTP/AVP\0" "rtp\0\0"
1004 "UDPLite/RTP/AVP\0" "udplite\0\0"
1005 "DCCP/RTP/AVP\0" "dccp\0\1"
1006 "TCP/RTP/AVP\0" "rtptcp\0\1"
1009 const char *vlc_proto = NULL;
1011 for (const char *proto = proto_match; *proto;)
1013 if (strcasecmp (proto, sdp_proto) == 0)
1015 vlc_proto = proto + strlen (proto) + 1;
1016 flags = vlc_proto[strlen (vlc_proto) + 1];
1019 proto += strlen (proto) + 1;
1020 proto += strlen (proto) + 2;
1024 if (vlc_proto == NULL)
1026 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
1027 p_sdp->mediav[0].fmt);
1028 return VLC_EGENERIC;
1031 if (!strcmp (vlc_proto, "udp") || FindAttribute (p_sdp, 0, "rtcp-mux"))
1032 p_sdp->rtcp_port = 0;
1035 const char *rtcp = FindAttribute (p_sdp, 0, "rtcp");
1037 p_sdp->rtcp_port = atoi (rtcp);
1039 if (port & 1) /* odd port -> RTCP; next even port -> RTP */
1040 p_sdp->rtcp_port = port++;
1041 else /* even port -> RTP; next odd port -> RTCP */
1042 p_sdp->rtcp_port = port + 1;
1047 /* Connection-oriented media */
1048 const char *setup = FindAttribute (p_sdp, 0, "setup");
1050 setup = "active"; /* default value */
1052 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
1054 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1055 return VLC_EGENERIC;
1058 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1064 /* Non-connected (normally multicast) media */
1065 char psz_source[258] = "";
1066 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1067 if (sfilter != NULL)
1069 char psz_source_ip[256];
1072 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1073 psz_source_ip) == 2)
1075 /* According to RFC4570, FQDNs can be used for source-filters,
1076 * but -seriously- this is impractical */
1082 struct in6_addr addr;
1083 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1084 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1085 sizeof (psz_source) - 2) != NULL))
1087 psz_source[0] = '[';
1088 psz_source[strlen (psz_source)] = ']';
1095 struct in_addr addr;
1096 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1097 && (inet_ntop (AF_INET, &addr, psz_source,
1098 sizeof (psz_source)) == NULL))
1106 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1115 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1116 socklen_t *addrlen, unsigned *number)
1119 unsigned fam, n1, n2;
1121 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1129 addr->ss_family = AF_INET6;
1133 *addrlen = sizeof (struct sockaddr_in6);
1135 if (inet_pton (AF_INET6, host,
1136 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1139 *number = (res >= 3) ? n1 : 1;
1144 addr->ss_family = AF_INET;
1148 *addrlen = sizeof (struct sockaddr_in);
1150 if (inet_pton (AF_INET, host,
1151 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1154 *number = (res >= 4) ? n2 : 1;
1164 /***********************************************************************
1165 * ParseSDP : SDP parsing
1166 * *********************************************************************
1167 * Validate SDP and parse all fields
1168 ***********************************************************************/
1169 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1171 if( psz_sdp == NULL )
1174 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1179 struct sockaddr_storage glob_addr;
1180 memset (&glob_addr, 0, sizeof (glob_addr));
1181 socklen_t glob_len = 0;
1182 unsigned glob_count = 1;
1185 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1188 /* Extract one line */
1189 char *eol = strchr (psz_sdp, '\n');
1190 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1191 char line[linelen + 1];
1192 memcpy (line, psz_sdp, linelen);
1193 line[linelen] = '\0';
1195 psz_sdp += linelen + 1;
1197 /* Remove carriage return if present */
1198 eol = strchr (line, '\r');
1201 linelen = eol - line;
1202 line[linelen] = '\0';
1206 char cat = line[0], *data = line + 2;
1207 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1209 /* MUST ignore SDP with unknown line type */
1210 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1215 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1219 assert (linelen >= 2);
1221 /* SDP parsing state machine
1222 * We INTERNALLY use uppercase for session, lowercase for media
1226 /* Session description */
1231 msg_Dbg (p_obj, "missing SDP version");
1234 if (strcmp (data, "0"))
1236 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1246 msg_Dbg (p_obj, "missing SDP originator");
1250 if ((sscanf (data, "%63s %"SCNu64" %"SCNu64" IN IP%u %1023s",
1251 p_sdp->username, &p_sdp->session_id,
1252 &p_sdp->session_version, &p_sdp->orig_ip_version,
1253 p_sdp->orig_host) != 5)
1254 || ((p_sdp->orig_ip_version != 4)
1255 && (p_sdp->orig_ip_version != 6)))
1257 msg_Dbg (p_obj, "SDP origin not supported: %s", data);
1258 /* Or maybe out-of-range, but this looks suspicious */
1261 EnsureUTF8 (p_sdp->orig_host);
1268 if ((cat != 's') || !*data)
1270 /* MUST be present AND non-empty */
1271 msg_Dbg (p_obj, "missing SDP session name");
1274 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1275 p_sdp->psz_sessionname = strdup (data);
1276 if (p_sdp->psz_sessionname == NULL)
1278 EnsureUTF8 (p_sdp->psz_sessionname);
1302 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1305 msg_Dbg (p_obj, "SDP connection infos not supported: "
1312 assert (expect == 'B');
1319 msg_Dbg (p_obj, "missing SDP time description");
1325 if ((cat == 't') || (cat == 'r'))
1340 attribute_t *p_attr = MakeAttribute (data);
1341 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1345 /* Media description */
1352 msg_Dbg (p_obj, "missing SDP media description");
1355 struct sdp_media_t *m;
1356 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1364 memset (m, 0, sizeof (*m));
1365 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1366 m->n_addr = glob_count;
1368 /* TODO: remember media type (if we need multiple medias) */
1369 data = strchr (data, ' ');
1372 msg_Dbg (p_obj, "missing SDP media port");
1375 port = atoi (++data);
1376 if (port <= 0 || port >= 65536)
1378 msg_Dbg (p_obj, "invalid transport port %d", port);
1381 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1383 data = strchr (data, ' ');
1386 msg_Dbg (p_obj, "missing SDP media format");
1389 m->fmt = strdup (++data);
1403 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1404 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1407 msg_Dbg (p_obj, "SDP connection infos not supported: "
1411 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1423 assert (expect == 'a');
1426 attribute_t *p_attr = MakeAttribute (data);
1430 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1431 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1440 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1446 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1458 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1461 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1463 return VLC_EGENERIC;
1465 shutdown( i_fd, SHUT_WR );
1466 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1467 p_sd->p_sys->i_fd, i_fd);
1471 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1474 int i_result, i_dstsize, n = 0;
1475 unsigned char *psz_dst = NULL;
1478 memset (&d_stream, 0, sizeof (d_stream));
1480 i_result = inflateInit(&d_stream);
1481 if( i_result != Z_OK )
1484 d_stream.next_in = (Bytef *)psz_src;
1485 d_stream.avail_in = i_len;
1490 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1491 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1492 d_stream.avail_out = 1000;
1494 i_result = inflate(&d_stream, Z_NO_FLUSH);
1495 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1497 inflateEnd( &d_stream );
1502 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1503 ( i_result != Z_STREAM_END ) );
1505 i_dstsize = d_stream.total_out;
1506 inflateEnd( &d_stream );
1508 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1520 static void FreeSDP( sdp_t *p_sdp )
1522 free( p_sdp->psz_sessionname );
1523 free( p_sdp->psz_uri );
1525 for (unsigned j = 0; j < p_sdp->mediac; j++)
1527 free (p_sdp->mediav[j].fmt);
1528 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1529 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1530 free (p_sdp->mediav[j].pp_attributes);
1532 free (p_sdp->mediav);
1534 for (int i = 0; i < p_sdp->i_attributes; i++)
1535 FreeAttribute (p_sdp->pp_attributes[i]);
1537 free (p_sdp->pp_attributes);
1541 static int RemoveAnnounce( services_discovery_t *p_sd,
1542 sap_announce_t *p_announce )
1546 if( p_announce->p_sdp )
1548 FreeSDP( p_announce->p_sdp );
1549 p_announce->p_sdp = NULL;
1552 if( p_announce->p_item )
1554 services_discovery_RemoveItem( p_sd, p_announce->p_item );
1555 vlc_gc_decref( p_announce->p_item );
1556 p_announce->p_item = NULL;
1559 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1561 if( p_sd->p_sys->pp_announces[i] == p_announce )
1563 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1574 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1576 /* A session is identified by
1579 * - network type (which is always IN),
1580 * - address type (currently, this means IP version),
1583 if (strcmp (p_sdp1->username, p_sdp2->username)
1584 || (p_sdp1->session_id != p_sdp2->session_id)
1585 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1586 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1593 static inline attribute_t *MakeAttribute (const char *str)
1595 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1599 strcpy (a->name, str);
1600 EnsureUTF8 (a->name);
1601 char *value = strchr (a->name, ':');
1613 static const char *GetAttribute (attribute_t **tab, unsigned n,
1616 for (unsigned i = 0; i < n; i++)
1617 if (strcasecmp (tab[i]->name, name) == 0)
1618 return tab[i]->value;
1623 static inline void FreeAttribute (attribute_t *a)