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 *****************************************************************************/
32 #include <vlc_playlist.h>
33 #include <vlc_demux.h>
35 #include <vlc_network.h>
36 #include <vlc_charset.h>
44 #ifdef HAVE_SYS_TIME_H
45 # include <sys/time.h>
59 /************************************************************************
60 * Macros and definitions
61 ************************************************************************/
63 #define MAX_LINE_LENGTH 256
65 /* SAP is always on that port */
67 /* Global-scope SAP address */
68 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
69 /* Organization-local SAP address */
70 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
71 /* Local (smallest non-link-local scope) SAP address */
72 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
73 /* Link-local SAP address */
74 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
77 /*****************************************************************************
79 *****************************************************************************/
80 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
81 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
82 "right addresses to listen to. However, you " \
83 "can specify a specific address." )
84 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
85 #define SAP_IPV4_LONGTEXT N_( \
86 "Listen to IPv4 announcements on the standard addresses." )
87 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
88 #define SAP_IPV6_LONGTEXT N_( \
89 "Listen to IPv6 announcements on the standard addresses." )
90 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
91 #define SAP_SCOPE_LONGTEXT N_( \
92 "Scope for IPv6 announcements (default is 8)." )
93 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
94 #define SAP_TIMEOUT_LONGTEXT N_( \
95 "Delay after which SAP items get deleted if no new announcement " \
97 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
98 #define SAP_PARSE_LONGTEXT N_( \
99 "This enables actual parsing of the announces by the SAP module. " \
100 "Otherwise, all announcements are parsed by the \"livedotcom\" " \
101 "(RTP/RTSP) module." )
102 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
103 #define SAP_STRICT_LONGTEXT N_( \
104 "When this is set, the SAP parser will discard some non-compliant " \
106 #define SAP_CACHE_TEXT N_("Use SAP cache")
107 #define SAP_CACHE_LONGTEXT N_( \
108 "This enables a SAP caching mechanism. " \
109 "This will result in lower SAP startup time, but you could end up " \
110 "with items corresponding to legacy streams." )
111 #define SAP_TIMESHIFT_TEXT N_("Allow timeshifting")
112 #define SAP_TIMESHIFT_LONGTEXT N_( "This automatically enables timeshifting " \
113 "for streams discovered through SAP announcements." )
116 static int Open ( vlc_object_t * );
117 static void Close( vlc_object_t * );
118 static int OpenDemux ( vlc_object_t * );
119 static void CloseDemux ( vlc_object_t * );
122 set_shortname( _("SAP"));
123 set_description( _("SAP Announcements") );
124 set_category( CAT_PLAYLIST );
125 set_subcategory( SUBCAT_PLAYLIST_SD );
127 add_string( "sap-addr", NULL, NULL,
128 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, VLC_TRUE );
129 add_bool( "sap-ipv4", 1 , NULL,
130 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, VLC_TRUE );
131 add_bool( "sap-ipv6", 1 , NULL,
132 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, VLC_TRUE );
133 add_integer( "sap-timeout", 1800, NULL,
134 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, VLC_TRUE );
135 add_bool( "sap-parse", 1 , NULL,
136 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, VLC_TRUE );
137 add_bool( "sap-strict", 0 , NULL,
138 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, VLC_TRUE );
140 add_bool( "sap-cache", 0 , NULL,
141 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, VLC_TRUE );
143 add_bool( "sap-timeshift", 0 , NULL,
144 SAP_TIMESHIFT_TEXT,SAP_TIMESHIFT_LONGTEXT, VLC_TRUE );
146 set_capability( "services_discovery", 0 );
147 set_callbacks( Open, Close );
150 set_description( _("SDP Descriptions parser") );
151 add_shortcut( "sdp" );
152 set_capability( "demux2", 51 );
153 set_callbacks( OpenDemux, CloseDemux );
157 /*****************************************************************************
159 *****************************************************************************/
161 typedef struct sdp_t sdp_t;
162 typedef struct attribute_t attribute_t;
163 typedef struct sap_announce_t sap_announce_t;
168 struct sdp_t *parent;
170 struct sockaddr_storage addr;
174 attribute_t **pp_attributes;
178 /* The structure that contains sdp information */
186 uint64_t session_version;
187 unsigned orig_ip_version;
188 char orig_host[1024];
191 char *psz_sessionname;
198 /* a= global attributes */
200 attribute_t **pp_attributes;
202 /* medias (well, we only support one atm) */
204 struct sdp_media_t *mediav;
213 struct sap_announce_t
217 uint8_t i_period_trust;
220 uint32_t i_source[4];
222 /* SAP annnounces must only contain one SDP */
228 struct services_discovery_sys_t
230 /* Socket descriptors */
234 /* Table of announces */
236 struct sap_announce_t **pp_announces;
241 vlc_bool_t b_timeshift;
251 /*****************************************************************************
253 *****************************************************************************/
257 static int Demux( demux_t *p_demux );
258 static int Control( demux_t *, int, va_list );
259 static void Run ( services_discovery_t *p_sd );
261 /* Main parsing functions */
262 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
263 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
264 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
265 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
266 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
268 /* Helper functions */
269 static inline attribute_t *MakeAttribute (const char *str);
270 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
271 static inline void FreeAttribute (attribute_t *a);
272 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
275 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
276 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
277 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
278 static void FreeSDP( sdp_t *p_sdp );
280 static inline int min( int a, int b )
282 return a > b ? b : a;
285 /*****************************************************************************
286 * Open: initialize and create stuff
287 *****************************************************************************/
288 static int Open( vlc_object_t *p_this )
290 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
291 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
292 malloc( sizeof( services_discovery_sys_t ) );
294 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
302 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
303 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
306 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
312 /* Cache sap_timeshift value */
313 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" );
316 services_discovery_SetLocalizedName( p_sd, _("SAP") );
318 p_sys->i_announces = 0;
319 p_sys->pp_announces = NULL;
324 /*****************************************************************************
325 * OpenDemux: initialize and create stuff
326 *****************************************************************************/
327 static int OpenDemux( vlc_object_t *p_this )
329 demux_t *p_demux = (demux_t *)p_this;
330 const uint8_t *p_peek;
331 char *psz_sdp = NULL;
333 int errval = VLC_EGENERIC;
336 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
338 /* We want livedotcom module to parse this SDP file */
342 assert( p_demux->s ); /* this is NOT an access_demux */
345 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
348 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
351 /* Gather the complete sdp file */
352 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
354 const int i_read_max = 1024;
355 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
357 if( psz_sdp_new == NULL )
362 psz_sdp = psz_sdp_new;
364 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
365 if( (int)i_read < 0 )
367 msg_Err( p_demux, "cannot read SDP" );
372 psz_sdp[i_len] = '\0';
374 if( (int)i_read < i_read_max )
378 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
382 msg_Warn( p_demux, "invalid SDP");
386 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
388 p_sdp->psz_uri = NULL;
390 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
391 p_sdp->i_media_type != 14 )
394 if( p_sdp->psz_uri == NULL ) goto error;
396 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
397 p_demux->p_sys->p_sdp = p_sdp;
398 p_demux->pf_control = Control;
399 p_demux->pf_demux = Demux;
406 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
407 stream_Seek( p_demux->s, 0 );
411 /*****************************************************************************
413 *****************************************************************************/
414 static void Close( vlc_object_t *p_this )
416 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
417 services_discovery_sys_t *p_sys = p_sd->p_sys;
421 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
423 net_Close( p_sys->pi_fd[i] );
425 FREENULL( p_sys->pi_fd );
428 if( config_GetInt( p_sd, "sap-cache" ) )
434 for( i = p_sys->i_announces - 1; i>= 0; i-- )
436 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
438 FREENULL( p_sys->pp_announces );
443 /*****************************************************************************
444 * CloseDemux: Close the demuxer
445 *****************************************************************************/
446 static void CloseDemux( vlc_object_t *p_this )
448 demux_t *p_demux = (demux_t *)p_this;
451 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
452 free( p_demux->p_sys );
456 /*****************************************************************************
457 * Run: main SAP thread
458 *****************************************************************************
459 * Listens to SAP packets, and sends them to packet_handle
460 *****************************************************************************/
461 #define MAX_SAP_BUFFER 5000
463 static void Run( services_discovery_t *p_sd )
469 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
470 * DNS queries, even if the DNS server returns an error with milliseconds.
471 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
472 * Winsock 1.1 from Windows 95, if not Windows 3.1.
473 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
474 * we have to open sockets in Run() rather than Open(). */
475 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
477 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
478 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
479 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
480 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
482 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
484 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
487 struct if_nameindex *l = if_nameindex ();
490 char *ptr = strchr (psz_address, '%') + 1;
491 for (unsigned i = 0; l[i].if_index; i++)
493 strcpy (ptr, l[i].if_name);
494 InitSocket (p_sd, psz_address, SAP_PORT);
496 if_freenameindex (l);
499 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
500 which if_nameindex uses internally anyway */
502 // first create a dummy socket to pin down the protocol family
503 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
504 if( s != INVALID_SOCKET )
506 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
507 size_t len = sizeof(ifaces);
509 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
511 unsigned ifcount = len/sizeof(INTERFACE_INFO);
512 char *ptr = strchr (psz_address, '%') + 1;
513 for(unsigned i = 1; i<=ifcount; ++i )
515 // append link-local zone identifier
516 sprintf(ptr, "%d", i);
522 *strchr (psz_address, '%') = '\0';
524 static const char ipv6_scopes[] = "1456789ABCDE";
525 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
527 psz_address[3] = *c_scope;
528 InitSocket( p_sd, psz_address, SAP_PORT );
532 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
533 if( psz_addr && *psz_addr )
535 InitSocket( p_sd, psz_addr, SAP_PORT );
539 if( p_sd->p_sys->i_fd == 0 )
541 msg_Err( p_sd, "unable to listen on any address" );
545 /* read SAP packets */
546 while( !p_sd->b_die )
548 unsigned n = p_sd->p_sys->i_fd;
549 struct pollfd ufd[n];
551 for (unsigned i = 0; i < n; i++)
553 ufd[i].fd = p_sd->p_sys->pi_fd[i];
554 ufd[i].events = POLLIN;
558 if (poll (ufd, n, timeout) > 0)
560 for (unsigned i = 0; i < n; i++)
564 uint8_t p_buffer[MAX_SAP_BUFFER+1];
567 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
568 MAX_SAP_BUFFER, VLC_FALSE);
570 msg_Warn (p_sd, "receive error: %m");
573 /* Parse the packet */
574 p_buffer[i_read] = '\0';
575 ParseSAP (p_sd, p_buffer, i_read);
581 mtime_t now = mdate();
583 /* A 1 hour timeout correspong to the RFC Implicit timeout.
584 * This timeout is tuned in the following loop. */
585 timeout = 1000 * 60 * 60;
587 /* Check for items that need deletion */
588 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
590 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
591 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
592 mtime_t i_last_period = now - p_announce->i_last;
594 /* Remove the annoucement, if the last announcement was 1 hour ago
595 * or if the last packet emitted was 3 times the average time
596 * between two packets */
597 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
598 i_last_period > i_timeout )
600 RemoveAnnounce( p_sd, p_announce );
604 /* Compute next timeout */
605 if( p_announce->i_period_trust > 5 )
606 timeout = min((3 * p_announce->i_period - i_last_period) / 1000, timeout);
607 timeout = min((i_timeout - i_last_period)/1000, timeout);
611 if( !p_sd->p_sys->i_announces )
612 timeout = -1; /* We can safely poll indefinitly. */
613 else if( timeout < 200 )
614 timeout = 200; /* Don't wakeup too fast. */
618 /**********************************************************************
619 * Demux: reads and demuxes data packets
620 * Return -1 if error, 0 if EOF, 1 else
621 **********************************************************************/
622 static int Demux( demux_t *p_demux )
624 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
625 input_thread_t *p_input;
626 input_item_t *p_parent_input;
628 playlist_t *p_playlist = pl_Yield( p_demux );
629 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
634 msg_Err( p_demux, "parent input could not be found" );
638 p_parent_input = input_GetItem( p_input );
640 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
641 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
643 vlc_mutex_lock( &p_parent_input->lock );
645 p_parent_input->i_type = ITEM_TYPE_NET;
647 if( p_playlist->status.p_item &&
648 p_playlist->status.p_item->p_input == p_parent_input )
650 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
651 p_playlist->status.p_node, p_playlist->status.p_item );
654 vlc_mutex_unlock( &p_parent_input->lock );
655 vlc_object_release( p_input );
656 vlc_object_release( p_playlist );
661 static int Control( demux_t *p_demux, int i_query, va_list args )
666 /**************************************************************
668 **************************************************************/
670 /* i_read is at least > 6 */
671 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
676 const uint8_t *end = buf + len;
679 assert (buf[len] == '\0');
684 uint8_t flags = buf[0];
686 /* First, check the sap announce is correct */
687 if ((flags >> 5) != 1)
690 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
691 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
695 msg_Dbg( p_sd, "encrypted packet, unsupported" );
699 vlc_bool_t b_compressed = (flags & 0x01) != 0;
701 uint16_t i_hash = U16_AT (buf + 2);
703 if( p_sd->p_sys->b_strict && i_hash == 0 )
705 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
709 // Skips source address and auth data
710 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
714 uint8_t *decomp = NULL;
717 int newsize = Decompress (buf, &decomp, end - buf);
720 msg_Dbg( p_sd, "decompression of SAP packet failed" );
724 decomp = realloc (decomp, newsize + 1);
725 decomp[newsize] = '\0';
726 psz_sdp = (const char *)decomp;
731 psz_sdp = (const char *)buf;
735 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
736 assert( psz_sdp[len] == '\0');
738 /* Skip payload type */
739 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
740 if (strncmp (psz_sdp, "v=0", 3))
742 size_t clen = strlen (psz_sdp) + 1;
744 if (strcmp (psz_sdp, "application/sdp"))
746 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
750 // skips content type
759 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
764 p_sdp->psz_sdp = psz_sdp;
766 /* Decide whether we should add a playlist item for this SDP */
767 /* Parse connection information (c= & m= ) */
768 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
769 p_sdp->psz_uri = NULL;
771 /* Multi-media or no-parse -> pass to LIVE.COM */
772 if( ( p_sdp->i_media_type != 14
773 && p_sdp->i_media_type != 32
774 && p_sdp->i_media_type != 33)
775 || p_sd->p_sys->b_parse == VLC_FALSE )
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 ) return VLC_EGENERIC;
784 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
786 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
788 /* FIXME: we create a new announce each time the sdp changes */
789 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
791 /* We don't support delete announcement as they can easily
792 * Be used to highjack an announcement by a third party.
793 * Intead we cleverly implement Implicit Announcement removal.
795 * if( b_need_delete )
796 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
802 /* No need to go after six, as we start to trust the
803 * average period at six */
804 if( p_announce->i_period_trust <= 5 )
805 p_announce->i_period_trust++;
807 /* Compute the average period */
808 p_announce->i_period = (p_announce->i_period + (mdate() - p_announce->i_last)) / 2;
809 p_announce->i_last = mdate();
811 FreeSDP( p_sdp ); p_sdp = NULL;
816 CreateAnnounce( p_sd, i_hash, p_sdp );
822 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
825 input_item_t *p_input;
826 const char *psz_value;
827 sap_announce_t *p_sap = (sap_announce_t *)malloc(
828 sizeof(sap_announce_t ) );
829 services_discovery_sys_t *p_sys;
835 p_sap->i_last = mdate();
837 p_sap->i_period_trust = 0;
838 p_sap->i_hash = i_hash;
839 p_sap->p_sdp = p_sdp;
841 /* Create the actual playlist item here */
842 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
843 p_sap->p_sdp->psz_uri,
844 p_sdp->psz_sessionname,
845 0, NULL, -1, ITEM_TYPE_NET );
846 p_sap->i_input_id = p_input->i_id;
853 if( p_sys->b_timeshift )
854 input_ItemAddOption( p_input, ":access-filter=timeshift" );
856 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
857 if( psz_value != NULL )
859 input_ItemAddInfo( p_input, _("Session"), _("Tool"), "%s",
862 if( strcmp( p_sdp->username, "-" ) )
864 input_ItemAddInfo( p_input, _("Session"), _("User"), "%s",
869 if (p_sap->p_sdp->mediac >= 1)
870 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
872 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
874 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
876 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
882 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
885 /* Look for media attribute, and fallback to session */
886 return GetAttribute (sdp->mediav[media].pp_attributes,
887 sdp->mediav[media].i_attributes, name)
888 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
892 /* Fill p_sdp->psz_uri */
893 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
895 if (p_sdp->mediac == 0)
897 msg_Dbg (p_obj, "Ignoring SDP with no media");
901 for (unsigned i = 1; i < p_sdp->mediac; i++)
903 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
904 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
905 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
906 p_sdp->mediav->addrlen))
908 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
913 if (p_sdp->mediav->n_addr != 1)
915 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
924 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
925 p_sdp->mediav->addrlen, psz_uri + 1,
926 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
929 if (strchr (psz_uri + 1, ':'))
932 strcat (psz_uri, "]");
938 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
939 if (sdp_proto == NULL)
942 char *subtype = strchr (sdp_proto, ' ');
945 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
946 p_sdp->i_media_type = 0;
951 p_sdp->i_media_type = atoi (subtype);
953 if (p_sdp->i_media_type == 0)
954 p_sdp->i_media_type = 33;
956 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
957 * 0x1: Connection-Oriented media. */
958 static const char proto_match[] =
960 "RTP/AVP\0" "rtp\0\0"
961 "UDPLite/RTP/AVP\0" "udplite\0\0"
962 "DCCP/RTP/AVP\0" "dccp\0\1"
963 "TCP/RTP/AVP\0" "rtptcp\0\1"
966 const char *vlc_proto = NULL;
968 for (const char *proto = proto_match; *proto;)
970 if (strcasecmp (proto, sdp_proto) == 0)
972 vlc_proto = proto + strlen (proto) + 1;
973 flags = vlc_proto[strlen (vlc_proto) + 1];
976 proto += strlen (proto) + 1;
977 proto += strlen (proto) + 2;
981 if (vlc_proto == NULL)
983 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
984 p_sdp->mediav[0].fmt);
990 /* Connection-oriented media */
991 const char *setup = FindAttribute (p_sdp, 0, "setup");
993 setup = "active"; /* default value */
995 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
997 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1001 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1007 /* Non-connected (normally multicast) media */
1009 char psz_source[258] = "";
1010 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1011 if (sfilter != NULL)
1013 char psz_source_ip[256];
1016 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1017 psz_source_ip) == 2)
1019 /* According to RFC4570, FQDNs can be used for source-filters,
1020 * but -seriously- this is impractical */
1026 struct in6_addr addr;
1027 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1028 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1029 sizeof (psz_source) - 2) != NULL))
1031 psz_source[0] = '[';
1032 psz_source[strlen (psz_source)] = ']';
1039 struct in_addr addr;
1040 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1041 && (inet_ntop (AF_INET, &addr, psz_source,
1042 sizeof (psz_source)) == NULL))
1050 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1059 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1060 socklen_t *addrlen, unsigned *number)
1063 unsigned fam, n1, n2;
1065 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1073 addr->ss_family = AF_INET6;
1077 *addrlen = sizeof (struct sockaddr_in6);
1079 if (inet_pton (AF_INET6, host,
1080 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1083 *number = (res >= 3) ? n1 : 1;
1088 addr->ss_family = AF_INET;
1092 *addrlen = sizeof (struct sockaddr_in);
1094 if (inet_pton (AF_INET, host,
1095 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1098 *number = (res >= 4) ? n2 : 1;
1108 /***********************************************************************
1109 * ParseSDP : SDP parsing
1110 * *********************************************************************
1111 * Validate SDP and parse all fields
1112 ***********************************************************************/
1113 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1115 if( psz_sdp == NULL )
1118 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1123 struct sockaddr_storage glob_addr;
1124 memset (&glob_addr, 0, sizeof (glob_addr));
1125 socklen_t glob_len = 0;
1126 unsigned glob_count = 1;
1129 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1132 /* Extract one line */
1133 char *eol = strchr (psz_sdp, '\n');
1134 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1135 char line[linelen + 1];
1136 memcpy (line, psz_sdp, linelen);
1137 line[linelen] = '\0';
1139 psz_sdp += linelen + 1;
1141 /* Remove carriage return if present */
1142 eol = strchr (line, '\r');
1145 linelen = eol - line;
1146 line[linelen] = '\0';
1150 char cat = line[0], *data = line + 2;
1151 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1153 /* MUST ignore SDP with unknown line type */
1154 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1159 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1163 assert (linelen >= 2);
1165 /* SDP parsing state machine
1166 * We INTERNALLY use uppercase for session, lowercase for media
1170 /* Session description */
1175 msg_Dbg (p_obj, "missing SDP version");
1178 if (strcmp (data, "0"))
1180 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1190 msg_Dbg (p_obj, "missing SDP originator");
1194 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1195 p_sdp->username, &p_sdp->session_id,
1196 &p_sdp->session_version, &p_sdp->orig_ip_version,
1197 p_sdp->orig_host) != 5)
1198 || ((p_sdp->orig_ip_version != 4)
1199 && (p_sdp->orig_ip_version != 6)))
1201 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1202 /* Or maybe out-of-range, but this looks suspicious */
1205 EnsureUTF8 (p_sdp->orig_host);
1212 if ((cat != 's') || !*data)
1214 /* MUST be present AND non-empty */
1215 msg_Dbg (p_obj, "missing SDP session name");
1218 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1219 p_sdp->psz_sessionname = strdup (data);
1220 EnsureUTF8 (p_sdp->psz_sessionname);
1221 if (p_sdp->psz_sessionname == NULL)
1246 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1249 msg_Dbg (p_obj, "SDP connection infos not supported: "
1256 assert (expect == 'B');
1263 msg_Dbg (p_obj, "missing SDP time description");
1269 if ((cat == 't') || (cat == 'r'))
1284 attribute_t *p_attr = MakeAttribute (data);
1285 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1289 /* Media description */
1296 msg_Dbg (p_obj, "missing SDP media description");
1299 struct sdp_media_t *m;
1300 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1308 memset (m, 0, sizeof (*m));
1309 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1310 m->n_addr = glob_count;
1312 /* TODO: remember media type (if we need multiple medias) */
1313 data = strchr (data, ' ');
1316 msg_Dbg (p_obj, "missing SDP media port");
1319 port = atoi (++data);
1320 if (port <= 0 || port >= 65536)
1322 msg_Dbg (p_obj, "invalid transport port %d", port);
1325 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1327 data = strchr (data, ' ');
1330 msg_Dbg (p_obj, "missing SDP media format");
1333 m->fmt = strdup (++data);
1347 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1348 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1351 msg_Dbg (p_obj, "SDP connection infos not supported: "
1355 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1367 assert (expect == 'a');
1370 attribute_t *p_attr = MakeAttribute (data);
1374 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1375 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1384 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1390 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1402 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1405 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1407 return VLC_EGENERIC;
1409 shutdown( i_fd, SHUT_WR );
1410 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1411 p_sd->p_sys->i_fd, i_fd);
1415 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1418 int i_result, i_dstsize, n = 0;
1419 unsigned char *psz_dst = NULL;
1422 memset (&d_stream, 0, sizeof (d_stream));
1424 i_result = inflateInit(&d_stream);
1425 if( i_result != Z_OK )
1428 d_stream.next_in = (Bytef *)psz_src;
1429 d_stream.avail_in = i_len;
1434 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1435 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1436 d_stream.avail_out = 1000;
1438 i_result = inflate(&d_stream, Z_NO_FLUSH);
1439 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1441 inflateEnd( &d_stream );
1445 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1446 ( i_result != Z_STREAM_END ) );
1448 i_dstsize = d_stream.total_out;
1449 inflateEnd( &d_stream );
1451 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1463 static void FreeSDP( sdp_t *p_sdp )
1465 free( p_sdp->psz_sessionname );
1466 free( p_sdp->psz_uri );
1468 for (unsigned j = 0; j < p_sdp->mediac; j++)
1470 free (p_sdp->mediav[j].fmt);
1471 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1472 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1473 free (p_sdp->mediav[j].pp_attributes);
1475 free (p_sdp->mediav);
1477 for (int i = 0; i < p_sdp->i_attributes; i++)
1478 FreeAttribute (p_sdp->pp_attributes[i]);
1480 free (p_sdp->pp_attributes);
1484 static int RemoveAnnounce( services_discovery_t *p_sd,
1485 sap_announce_t *p_announce )
1489 if( p_announce->p_sdp )
1491 FreeSDP( p_announce->p_sdp );
1492 p_announce->p_sdp = NULL;
1495 if( p_announce->i_input_id > -1 )
1496 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1498 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1500 if( p_sd->p_sys->pp_announces[i] == p_announce )
1502 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1513 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1515 /* A session is identified by
1518 * - network type (which is always IN),
1519 * - address type (currently, this means IP version),
1522 if (strcmp (p_sdp1->username, p_sdp2->username)
1523 || (p_sdp1->session_id != p_sdp2->session_id)
1524 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1525 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1532 static inline attribute_t *MakeAttribute (const char *str)
1534 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1538 strcpy (a->name, str);
1539 EnsureUTF8 (a->name);
1540 char *value = strchr (a->name, ':');
1552 static const char *GetAttribute (attribute_t **tab, unsigned n,
1555 for (unsigned i = 0; i < n; i++)
1556 if (strcasecmp (tab[i]->name, name) == 0)
1557 return tab[i]->value;
1562 static inline void FreeAttribute (attribute_t *a)