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>
56 /************************************************************************
57 * Macros and definitions
58 ************************************************************************/
60 #define MAX_LINE_LENGTH 256
62 /* SAP is always on that port */
64 /* Global-scope SAP address */
65 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
66 /* Organization-local SAP address */
67 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
68 /* Local (smallest non-link-local scope) SAP address */
69 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
70 /* Link-local SAP address */
71 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
74 /*****************************************************************************
76 *****************************************************************************/
77 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
78 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
79 "right addresses to listen to. However, you " \
80 "can specify a specific address." )
81 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
82 #define SAP_IPV4_LONGTEXT N_( \
83 "Listen to IPv4 announcements on the standard addresses." )
84 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
85 #define SAP_IPV6_LONGTEXT N_( \
86 "Listen to IPv6 announcements on the standard addresses." )
87 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
88 #define SAP_SCOPE_LONGTEXT N_( \
89 "Scope for IPv6 announcements (default is 8)." )
90 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
91 #define SAP_TIMEOUT_LONGTEXT N_( \
92 "Delay after which SAP items get deleted if no new announcement " \
94 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
95 #define SAP_PARSE_LONGTEXT N_( \
96 "This enables actual parsing of the announces by the SAP module. " \
97 "Otherwise, all announcements are parsed by the \"livedotcom\" " \
98 "(RTP/RTSP) module." )
99 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
100 #define SAP_STRICT_LONGTEXT N_( \
101 "When this is set, the SAP parser will discard some non-compliant " \
103 #define SAP_CACHE_TEXT N_("Use SAP cache")
104 #define SAP_CACHE_LONGTEXT N_( \
105 "This enables a SAP caching mechanism. " \
106 "This will result in lower SAP startup time, but you could end up " \
107 "with items corresponding to legacy streams." )
108 #define SAP_TIMESHIFT_TEXT N_("Allow timeshifting")
109 #define SAP_TIMESHIFT_LONGTEXT N_( "This automatically enables timeshifting " \
110 "for streams discovered through SAP announcements." )
113 static int Open ( vlc_object_t * );
114 static void Close( vlc_object_t * );
115 static int OpenDemux ( vlc_object_t * );
116 static void CloseDemux ( vlc_object_t * );
119 set_shortname( _("SAP"));
120 set_description( _("SAP Announcements") );
121 set_category( CAT_PLAYLIST );
122 set_subcategory( SUBCAT_PLAYLIST_SD );
124 add_string( "sap-addr", NULL, NULL,
125 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, VLC_TRUE );
126 add_bool( "sap-ipv4", 1 , NULL,
127 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, VLC_TRUE );
128 add_bool( "sap-ipv6", 1 , NULL,
129 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, VLC_TRUE );
130 add_integer( "sap-timeout", 1800, NULL,
131 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, VLC_TRUE );
132 add_bool( "sap-parse", 1 , NULL,
133 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, VLC_TRUE );
134 add_bool( "sap-strict", 0 , NULL,
135 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, VLC_TRUE );
137 add_bool( "sap-cache", 0 , NULL,
138 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, VLC_TRUE );
140 add_bool( "sap-timeshift", 0 , NULL,
141 SAP_TIMESHIFT_TEXT,SAP_TIMESHIFT_LONGTEXT, VLC_TRUE );
143 set_capability( "services_discovery", 0 );
144 set_callbacks( Open, Close );
147 set_description( _("SDP Descriptions parser") );
148 add_shortcut( "sdp" );
149 set_capability( "demux2", 51 );
150 set_callbacks( OpenDemux, CloseDemux );
154 /*****************************************************************************
156 *****************************************************************************/
158 typedef struct sdp_t sdp_t;
159 typedef struct attribute_t attribute_t;
160 typedef struct sap_announce_t sap_announce_t;
165 struct sdp_t *parent;
167 struct sockaddr_storage addr;
171 attribute_t **pp_attributes;
175 /* The structure that contains sdp information */
183 uint64_t session_version;
184 unsigned orig_ip_version;
185 char orig_host[1024];
188 char *psz_sessionname;
195 /* a= global attributes */
197 attribute_t **pp_attributes;
199 /* medias (well, we only support one atm) */
201 struct sdp_media_t *mediav;
210 struct sap_announce_t
214 uint8_t i_period_trust;
217 uint32_t i_source[4];
219 /* SAP annnounces must only contain one SDP */
225 struct services_discovery_sys_t
227 /* Socket descriptors */
231 /* Table of announces */
233 struct sap_announce_t **pp_announces;
238 vlc_bool_t b_timeshift;
248 /*****************************************************************************
250 *****************************************************************************/
254 static int Demux( demux_t *p_demux );
255 static int Control( demux_t *, int, va_list );
256 static void Run ( services_discovery_t *p_sd );
258 /* Main parsing functions */
259 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
260 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
261 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
262 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
263 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
265 /* Helper functions */
266 static inline attribute_t *MakeAttribute (const char *str);
267 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
268 static inline void FreeAttribute (attribute_t *a);
269 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
272 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
273 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
274 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
275 static void FreeSDP( sdp_t *p_sdp );
277 /*****************************************************************************
278 * Open: initialize and create stuff
279 *****************************************************************************/
280 static int Open( vlc_object_t *p_this )
282 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
283 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
284 malloc( sizeof( services_discovery_sys_t ) );
286 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
294 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
295 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
298 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
304 /* Cache sap_timeshift value */
305 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" );
308 services_discovery_SetLocalizedName( p_sd, _("SAP") );
310 p_sys->i_announces = 0;
311 p_sys->pp_announces = NULL;
316 /*****************************************************************************
317 * OpenDemux: initialize and create stuff
318 *****************************************************************************/
319 static int OpenDemux( vlc_object_t *p_this )
321 demux_t *p_demux = (demux_t *)p_this;
322 const uint8_t *p_peek;
323 char *psz_sdp = NULL;
325 int errval = VLC_EGENERIC;
328 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
330 /* We want livedotcom module to parse this SDP file */
334 assert( p_demux->s ); /* this is NOT an access_demux */
337 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
340 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
343 /* Gather the complete sdp file */
344 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
346 const int i_read_max = 1024;
347 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
349 if( psz_sdp_new == NULL )
354 psz_sdp = psz_sdp_new;
356 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
357 if( (int)i_read < 0 )
359 msg_Err( p_demux, "cannot read SDP" );
364 psz_sdp[i_len] = '\0';
366 if( (int)i_read < i_read_max )
370 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
374 msg_Warn( p_demux, "invalid SDP");
378 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
380 p_sdp->psz_uri = NULL;
382 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
383 p_sdp->i_media_type != 14 )
386 if( p_sdp->psz_uri == NULL ) goto error;
388 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
389 p_demux->p_sys->p_sdp = p_sdp;
390 p_demux->pf_control = Control;
391 p_demux->pf_demux = Demux;
398 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
399 stream_Seek( p_demux->s, 0 );
403 /*****************************************************************************
405 *****************************************************************************/
406 static void Close( vlc_object_t *p_this )
408 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
409 services_discovery_sys_t *p_sys = p_sd->p_sys;
413 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
415 net_Close( p_sys->pi_fd[i] );
417 FREENULL( p_sys->pi_fd );
420 if( config_GetInt( p_sd, "sap-cache" ) )
426 for( i = p_sys->i_announces - 1; i>= 0; i-- )
428 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
430 FREENULL( p_sys->pp_announces );
435 /*****************************************************************************
436 * CloseDemux: Close the demuxer
437 *****************************************************************************/
438 static void CloseDemux( vlc_object_t *p_this )
440 demux_t *p_demux = (demux_t *)p_this;
443 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
444 free( p_demux->p_sys );
448 /*****************************************************************************
449 * Run: main SAP thread
450 *****************************************************************************
451 * Listens to SAP packets, and sends them to packet_handle
452 *****************************************************************************/
453 #define MAX_SAP_BUFFER 5000
455 static void Run( services_discovery_t *p_sd )
460 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
461 * DNS queries, even if the DNS server returns an error with milliseconds.
462 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
463 * Winsock 1.1 from Windows 95, if not Windows 3.1.
464 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
465 * we have to open sockets in Run() rather than Open(). */
466 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
468 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
469 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
470 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
471 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
473 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
475 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
478 struct if_nameindex *l = if_nameindex ();
481 char *ptr = strchr (psz_address, '%') + 1;
482 for (unsigned i = 0; l[i].if_index; i++)
484 strcpy (ptr, l[i].if_name);
485 InitSocket (p_sd, psz_address, SAP_PORT);
487 if_freenameindex (l);
490 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
491 which if_nameindex uses internally anyway */
493 // first create a dummy socket to pin down the protocol family
494 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
495 if( s != INVALID_SOCKET )
497 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
498 size_t len = sizeof(ifaces);
500 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
502 unsigned ifcount = len/sizeof(INTERFACE_INFO);
503 char *ptr = strchr (psz_address, '%') + 1;
504 for(unsigned i = 1; i<=ifcount; ++i )
506 // append link-local zone identifier
507 sprintf(ptr, "%d", i);
513 *strchr (psz_address, '%') = '\0';
515 static const char ipv6_scopes[] = "1456789ABCDE";
516 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
518 psz_address[3] = *c_scope;
519 InitSocket( p_sd, psz_address, SAP_PORT );
523 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
524 if( psz_addr && *psz_addr )
526 InitSocket( p_sd, psz_addr, SAP_PORT );
530 if( p_sd->p_sys->i_fd == 0 )
532 msg_Err( p_sd, "unable to listen on any address" );
536 /* read SAP packets */
537 while( !p_sd->b_die )
540 uint8_t p_buffer[MAX_SAP_BUFFER+1];
542 i_read = net_Select( p_sd, p_sd->p_sys->pi_fd,
543 p_sd->p_sys->i_fd, p_buffer,
544 MAX_SAP_BUFFER, 500 );
546 /* Check for items that need deletion */
547 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
549 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
550 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
551 mtime_t i_last_period = mdate() - p_announce->i_last;
553 /* Remove the annoucement, if the last announcement was 1 hour ago
554 * or if the last packet emitted was 3 times the average time
555 * between two packets */
556 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
557 i_last_period > i_timeout )
559 RemoveAnnounce( p_sd, p_announce );
563 /* Minimum length is > 6 */
568 msg_Warn( p_sd, "socket read error" );
573 p_buffer[i_read] = '\0';
575 /* Parse the packet */
576 ParseSAP( p_sd, p_buffer, i_read );
580 /**********************************************************************
581 * Demux: reads and demuxes data packets
582 * Return -1 if error, 0 if EOF, 1 else
583 **********************************************************************/
584 static int Demux( demux_t *p_demux )
586 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
587 input_thread_t *p_input;
588 input_item_t *p_parent_input;
590 playlist_t *p_playlist = pl_Yield( p_demux );
591 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
596 msg_Err( p_demux, "parent input could not be found" );
600 p_parent_input = input_GetItem( p_input );
602 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
603 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
605 vlc_mutex_lock( &p_parent_input->lock );
607 p_parent_input->i_type = ITEM_TYPE_NET;
609 if( p_playlist->status.p_item &&
610 p_playlist->status.p_item->p_input == p_parent_input )
612 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
613 p_playlist->status.p_node, p_playlist->status.p_item );
616 vlc_mutex_unlock( &p_parent_input->lock );
617 vlc_object_release( p_input );
618 vlc_object_release( p_playlist );
623 static int Control( demux_t *p_demux, int i_query, va_list args )
628 /**************************************************************
630 **************************************************************/
632 /* i_read is at least > 6 */
633 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
638 const uint8_t *end = buf + len;
641 assert (buf[len] == '\0');
646 uint8_t flags = buf[0];
648 /* First, check the sap announce is correct */
649 if ((flags >> 5) != 1)
652 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
653 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
657 msg_Dbg( p_sd, "encrypted packet, unsupported" );
661 vlc_bool_t b_compressed = (flags & 0x01) != 0;
663 uint16_t i_hash = U16_AT (buf + 2);
665 if( p_sd->p_sys->b_strict && i_hash == 0 )
667 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
671 // Skips source address and auth data
672 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
676 uint8_t *decomp = NULL;
679 int newsize = Decompress (buf, &decomp, end - buf);
682 msg_Dbg( p_sd, "decompression of SAP packet failed" );
686 decomp = realloc (decomp, newsize + 1);
687 decomp[newsize] = '\0';
688 psz_sdp = (const char *)decomp;
693 psz_sdp = (const char *)buf;
697 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
698 assert( psz_sdp[len] == '\0');
700 /* Skip payload type */
701 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
702 if (strncmp (psz_sdp, "v=0", 3))
704 size_t clen = strlen (psz_sdp) + 1;
706 if (strcmp (psz_sdp, "application/sdp"))
708 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
712 // skips content type
721 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
726 p_sdp->psz_sdp = psz_sdp;
728 /* Decide whether we should add a playlist item for this SDP */
729 /* Parse connection information (c= & m= ) */
730 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
731 p_sdp->psz_uri = NULL;
733 /* Multi-media or no-parse -> pass to LIVE.COM */
734 if( ( p_sdp->i_media_type != 14
735 && p_sdp->i_media_type != 32
736 && p_sdp->i_media_type != 33)
737 || p_sd->p_sys->b_parse == VLC_FALSE )
739 free( p_sdp->psz_uri );
740 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
741 p_sdp->psz_uri = NULL;
744 if( p_sdp->psz_uri == NULL ) return VLC_EGENERIC;
746 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
748 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
750 /* FIXME: we create a new announce each time the sdp changes */
751 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
753 /* We don't support delete announcement as they can easily
754 * Be used to highjack an announcement by a third party.
755 * Intead we cleverly implement Implicit Announcement removal.
757 * if( b_need_delete )
758 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
764 /* No need to go after six, as we start to trust the
765 * average period at six */
766 if( p_announce->i_period_trust <= 5 )
767 p_announce->i_period_trust++;
769 /* Compute the average period */
770 p_announce->i_period = (p_announce->i_period + (mdate() - p_announce->i_last)) / 2;
771 p_announce->i_last = mdate();
773 FreeSDP( p_sdp ); p_sdp = NULL;
778 CreateAnnounce( p_sd, i_hash, p_sdp );
784 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
787 input_item_t *p_input;
788 const char *psz_value;
789 sap_announce_t *p_sap = (sap_announce_t *)malloc(
790 sizeof(sap_announce_t ) );
791 services_discovery_sys_t *p_sys;
797 p_sap->i_last = mdate();
799 p_sap->i_period_trust = 0;
800 p_sap->i_hash = i_hash;
801 p_sap->p_sdp = p_sdp;
803 /* Create the actual playlist item here */
804 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
805 p_sap->p_sdp->psz_uri,
806 p_sdp->psz_sessionname,
807 0, NULL, -1, ITEM_TYPE_NET );
808 p_sap->i_input_id = p_input->i_id;
815 if( p_sys->b_timeshift )
816 input_ItemAddOption( p_input, ":access-filter=timeshift" );
818 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
819 if( psz_value != NULL )
821 input_ItemAddInfo( p_input, _("Session"), _("Tool"), "%s",
824 if( strcmp( p_sdp->username, "-" ) )
826 input_ItemAddInfo( p_input, _("Session"), _("User"), "%s",
831 if (p_sap->p_sdp->mediac >= 1)
832 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
834 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
836 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
838 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
844 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
847 /* Look for media attribute, and fallback to session */
848 return GetAttribute (sdp->mediav[media].pp_attributes,
849 sdp->mediav[media].i_attributes, name)
850 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
854 /* Fill p_sdp->psz_uri */
855 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
857 if (p_sdp->mediac == 0)
859 msg_Dbg (p_obj, "Ignoring SDP with no media");
863 for (unsigned i = 1; i < p_sdp->mediac; i++)
865 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
866 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
867 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
868 p_sdp->mediav->addrlen))
870 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
875 if (p_sdp->mediav->n_addr != 1)
877 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
886 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
887 p_sdp->mediav->addrlen, psz_uri + 1,
888 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
891 if (strchr (psz_uri + 1, ':'))
894 strcat (psz_uri, "]");
900 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
901 if (sdp_proto == NULL)
904 char *subtype = strchr (sdp_proto, ' ');
907 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
908 p_sdp->i_media_type = 0;
913 p_sdp->i_media_type = atoi (subtype);
915 if (p_sdp->i_media_type == 0)
916 p_sdp->i_media_type = 33;
918 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
919 * 0x1: Connection-Oriented media. */
920 static const char proto_match[] =
922 "RTP/AVP\0" "rtp\0\0"
923 "UDPLite/RTP/AVP\0" "udplite\0\0"
924 "DCCP/RTP/AVP\0" "dccp\0\1"
925 "TCP/RTP/AVP\0" "rtptcp\0\1"
928 const char *vlc_proto = NULL;
930 for (const char *proto = proto_match; *proto;)
932 if (strcasecmp (proto, sdp_proto) == 0)
934 vlc_proto = proto + strlen (proto) + 1;
935 flags = vlc_proto[strlen (vlc_proto) + 1];
938 proto += strlen (proto) + 1;
939 proto += strlen (proto) + 2;
943 if (vlc_proto == NULL)
945 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
946 p_sdp->mediav[0].fmt);
952 /* Connection-oriented media */
953 const char *setup = FindAttribute (p_sdp, 0, "setup");
955 setup = "active"; /* default value */
957 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
959 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
963 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
969 /* Non-connected (normally multicast) media */
971 char psz_source[258] = "";
972 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
975 char psz_source_ip[256];
978 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
981 /* According to RFC4570, FQDNs can be used for source-filters,
982 * but -seriously- this is impractical */
988 struct in6_addr addr;
989 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
990 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
991 sizeof (psz_source) - 2) != NULL))
994 psz_source[strlen (psz_source)] = ']';
1001 struct in_addr addr;
1002 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1003 && (inet_ntop (AF_INET, &addr, psz_source,
1004 sizeof (psz_source)) == NULL))
1012 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1021 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1022 socklen_t *addrlen, unsigned *number)
1025 unsigned fam, n1, n2;
1027 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1035 addr->ss_family = AF_INET6;
1039 *addrlen = sizeof (struct sockaddr_in6);
1041 if (inet_pton (AF_INET6, host,
1042 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1045 *number = (res >= 3) ? n1 : 1;
1050 addr->ss_family = AF_INET;
1054 *addrlen = sizeof (struct sockaddr_in);
1056 if (inet_pton (AF_INET, host,
1057 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1060 *number = (res >= 4) ? n2 : 1;
1070 /***********************************************************************
1071 * ParseSDP : SDP parsing
1072 * *********************************************************************
1073 * Validate SDP and parse all fields
1074 ***********************************************************************/
1075 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1077 if( psz_sdp == NULL )
1080 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1085 struct sockaddr_storage glob_addr;
1086 memset (&glob_addr, 0, sizeof (glob_addr));
1087 socklen_t glob_len = 0;
1088 unsigned glob_count = 1;
1091 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1094 /* Extract one line */
1095 char *eol = strchr (psz_sdp, '\n');
1096 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1097 char line[linelen + 1];
1098 memcpy (line, psz_sdp, linelen);
1099 line[linelen] = '\0';
1101 psz_sdp += linelen + 1;
1103 /* Remove carriage return if present */
1104 eol = strchr (line, '\r');
1107 linelen = eol - line;
1108 line[linelen] = '\0';
1112 char cat = line[0], *data = line + 2;
1113 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1115 /* MUST ignore SDP with unknown line type */
1116 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1121 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1125 assert (linelen >= 2);
1127 /* SDP parsing state machine
1128 * We INTERNALLY use uppercase for session, lowercase for media
1132 /* Session description */
1137 msg_Dbg (p_obj, "missing SDP version");
1140 if (strcmp (data, "0"))
1142 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1152 msg_Dbg (p_obj, "missing SDP originator");
1156 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1157 p_sdp->username, &p_sdp->session_id,
1158 &p_sdp->session_version, &p_sdp->orig_ip_version,
1159 p_sdp->orig_host) != 5)
1160 || ((p_sdp->orig_ip_version != 4)
1161 && (p_sdp->orig_ip_version != 6)))
1163 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1164 /* Or maybe out-of-range, but this looks suspicious */
1167 EnsureUTF8 (p_sdp->orig_host);
1174 if ((cat != 's') || !*data)
1176 /* MUST be present AND non-empty */
1177 msg_Dbg (p_obj, "missing SDP session name");
1180 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1181 p_sdp->psz_sessionname = strdup (data);
1182 EnsureUTF8 (p_sdp->psz_sessionname);
1183 if (p_sdp->psz_sessionname == NULL)
1208 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1211 msg_Dbg (p_obj, "SDP connection infos not supported: "
1218 assert (expect == 'B');
1225 msg_Dbg (p_obj, "missing SDP time description");
1231 if ((cat == 't') || (cat == 'r'))
1246 attribute_t *p_attr = MakeAttribute (data);
1247 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1251 /* Media description */
1258 msg_Dbg (p_obj, "missing SDP media description");
1261 struct sdp_media_t *m;
1262 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1270 memset (m, 0, sizeof (*m));
1271 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1272 m->n_addr = glob_count;
1274 /* TODO: remember media type (if we need multiple medias) */
1275 data = strchr (data, ' ');
1278 msg_Dbg (p_obj, "missing SDP media port");
1281 port = atoi (++data);
1282 if (port <= 0 || port >= 65536)
1284 msg_Dbg (p_obj, "invalid transport port %d", port);
1287 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1289 data = strchr (data, ' ');
1292 msg_Dbg (p_obj, "missing SDP media format");
1295 m->fmt = strdup (++data);
1309 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1310 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1313 msg_Dbg (p_obj, "SDP connection infos not supported: "
1317 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1329 assert (expect == 'a');
1332 attribute_t *p_attr = MakeAttribute (data);
1336 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1337 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1346 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1352 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1364 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1367 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1369 return VLC_EGENERIC;
1371 shutdown( i_fd, SHUT_WR );
1372 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1373 p_sd->p_sys->i_fd, i_fd);
1377 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1380 int i_result, i_dstsize, n = 0;
1381 unsigned char *psz_dst = NULL;
1384 memset (&d_stream, 0, sizeof (d_stream));
1386 i_result = inflateInit(&d_stream);
1387 if( i_result != Z_OK )
1390 d_stream.next_in = (Bytef *)psz_src;
1391 d_stream.avail_in = i_len;
1396 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1397 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1398 d_stream.avail_out = 1000;
1400 i_result = inflate(&d_stream, Z_NO_FLUSH);
1401 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1403 inflateEnd( &d_stream );
1407 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1408 ( i_result != Z_STREAM_END ) );
1410 i_dstsize = d_stream.total_out;
1411 inflateEnd( &d_stream );
1413 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1425 static void FreeSDP( sdp_t *p_sdp )
1427 free( p_sdp->psz_sessionname );
1428 free( p_sdp->psz_uri );
1430 for (unsigned j = 0; j < p_sdp->mediac; j++)
1432 free (p_sdp->mediav[j].fmt);
1433 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1434 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1435 free (p_sdp->mediav[j].pp_attributes);
1437 free (p_sdp->mediav);
1439 for (int i = 0; i < p_sdp->i_attributes; i++)
1440 FreeAttribute (p_sdp->pp_attributes[i]);
1442 free (p_sdp->pp_attributes);
1446 static int RemoveAnnounce( services_discovery_t *p_sd,
1447 sap_announce_t *p_announce )
1451 if( p_announce->p_sdp )
1453 FreeSDP( p_announce->p_sdp );
1454 p_announce->p_sdp = NULL;
1457 if( p_announce->i_input_id > -1 )
1458 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1460 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1462 if( p_sd->p_sys->pp_announces[i] == p_announce )
1464 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1475 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1477 /* A session is identified by
1480 * - network type (which is always IN),
1481 * - address type (currently, this means IP version),
1484 if (strcmp (p_sdp1->username, p_sdp2->username)
1485 || (p_sdp1->session_id != p_sdp2->session_id)
1486 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1487 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1494 static inline attribute_t *MakeAttribute (const char *str)
1496 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1500 strcpy (a->name, str);
1501 EnsureUTF8 (a->name);
1502 char *value = strchr (a->name, ':');
1514 static const char *GetAttribute (attribute_t **tab, unsigned n,
1517 for (unsigned i = 0; i < n; i++)
1518 if (strcasecmp (tab[i]->name, name) == 0)
1519 return tab[i]->value;
1524 static inline void FreeAttribute (attribute_t *a)