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 /*****************************************************************************
281 * Open: initialize and create stuff
282 *****************************************************************************/
283 static int Open( vlc_object_t *p_this )
285 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
286 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
287 malloc( sizeof( services_discovery_sys_t ) );
289 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
297 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
298 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
301 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
307 /* Cache sap_timeshift value */
308 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" );
311 services_discovery_SetLocalizedName( p_sd, _("SAP") );
313 p_sys->i_announces = 0;
314 p_sys->pp_announces = NULL;
319 /*****************************************************************************
320 * OpenDemux: initialize and create stuff
321 *****************************************************************************/
322 static int OpenDemux( vlc_object_t *p_this )
324 demux_t *p_demux = (demux_t *)p_this;
325 const uint8_t *p_peek;
326 char *psz_sdp = NULL;
328 int errval = VLC_EGENERIC;
331 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
333 /* We want livedotcom module to parse this SDP file */
337 assert( p_demux->s ); /* this is NOT an access_demux */
340 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
343 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
346 /* Gather the complete sdp file */
347 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
349 const int i_read_max = 1024;
350 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
352 if( psz_sdp_new == NULL )
357 psz_sdp = psz_sdp_new;
359 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
360 if( (int)i_read < 0 )
362 msg_Err( p_demux, "cannot read SDP" );
367 psz_sdp[i_len] = '\0';
369 if( (int)i_read < i_read_max )
373 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
377 msg_Warn( p_demux, "invalid SDP");
381 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
383 p_sdp->psz_uri = NULL;
385 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
386 p_sdp->i_media_type != 14 )
389 if( p_sdp->psz_uri == NULL ) goto error;
391 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
392 p_demux->p_sys->p_sdp = p_sdp;
393 p_demux->pf_control = Control;
394 p_demux->pf_demux = Demux;
401 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
402 stream_Seek( p_demux->s, 0 );
406 /*****************************************************************************
408 *****************************************************************************/
409 static void Close( vlc_object_t *p_this )
411 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
412 services_discovery_sys_t *p_sys = p_sd->p_sys;
416 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
418 net_Close( p_sys->pi_fd[i] );
420 FREENULL( p_sys->pi_fd );
423 if( config_GetInt( p_sd, "sap-cache" ) )
429 for( i = p_sys->i_announces - 1; i>= 0; i-- )
431 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
433 FREENULL( p_sys->pp_announces );
438 /*****************************************************************************
439 * CloseDemux: Close the demuxer
440 *****************************************************************************/
441 static void CloseDemux( vlc_object_t *p_this )
443 demux_t *p_demux = (demux_t *)p_this;
446 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
447 free( p_demux->p_sys );
451 /*****************************************************************************
452 * Run: main SAP thread
453 *****************************************************************************
454 * Listens to SAP packets, and sends them to packet_handle
455 *****************************************************************************/
456 #define MAX_SAP_BUFFER 5000
458 static void Run( services_discovery_t *p_sd )
463 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
464 * DNS queries, even if the DNS server returns an error with milliseconds.
465 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
466 * Winsock 1.1 from Windows 95, if not Windows 3.1.
467 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
468 * we have to open sockets in Run() rather than Open(). */
469 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
471 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
472 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
473 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
474 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
476 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
478 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
481 struct if_nameindex *l = if_nameindex ();
484 char *ptr = strchr (psz_address, '%') + 1;
485 for (unsigned i = 0; l[i].if_index; i++)
487 strcpy (ptr, l[i].if_name);
488 InitSocket (p_sd, psz_address, SAP_PORT);
490 if_freenameindex (l);
493 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
494 which if_nameindex uses internally anyway */
496 // first create a dummy socket to pin down the protocol family
497 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
498 if( s != INVALID_SOCKET )
500 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
501 size_t len = sizeof(ifaces);
503 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
505 unsigned ifcount = len/sizeof(INTERFACE_INFO);
506 char *ptr = strchr (psz_address, '%') + 1;
507 for(unsigned i = 1; i<=ifcount; ++i )
509 // append link-local zone identifier
510 sprintf(ptr, "%d", i);
516 *strchr (psz_address, '%') = '\0';
518 static const char ipv6_scopes[] = "1456789ABCDE";
519 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
521 psz_address[3] = *c_scope;
522 InitSocket( p_sd, psz_address, SAP_PORT );
526 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
527 if( psz_addr && *psz_addr )
529 InitSocket( p_sd, psz_addr, SAP_PORT );
533 if( p_sd->p_sys->i_fd == 0 )
535 msg_Err( p_sd, "unable to listen on any address" );
539 /* read SAP packets */
540 while( !p_sd->b_die )
542 unsigned n = p_sd->p_sys->i_fd;
543 struct pollfd ufd[n];
545 for (unsigned i = 0; i < n; i++)
547 ufd[i].fd = p_sd->p_sys->pi_fd[i];
548 ufd[i].events = POLLIN;
552 /* FIXME FIXME FIXME: short arbitrary timer */
553 if (poll (ufd, n, 500) > 0)
555 for (unsigned i = 0; i < n; i++)
559 uint8_t p_buffer[MAX_SAP_BUFFER+1];
562 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
563 MAX_SAP_BUFFER, VLC_FALSE);
565 msg_Warn (p_sd, "receive error: %m");
568 /* Parse the packet */
569 p_buffer[i_read] = '\0';
570 ParseSAP (p_sd, p_buffer, i_read);
576 mtime_t now = mdate();
578 /* Check for items that need deletion */
579 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
581 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
582 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
583 mtime_t i_last_period = now - p_announce->i_last;
585 /* Remove the annoucement, if the last announcement was 1 hour ago
586 * or if the last packet emitted was 3 times the average time
587 * between two packets */
588 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
589 i_last_period > i_timeout )
591 RemoveAnnounce( p_sd, p_announce );
597 /**********************************************************************
598 * Demux: reads and demuxes data packets
599 * Return -1 if error, 0 if EOF, 1 else
600 **********************************************************************/
601 static int Demux( demux_t *p_demux )
603 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
604 input_thread_t *p_input;
605 input_item_t *p_parent_input;
607 playlist_t *p_playlist = pl_Yield( p_demux );
608 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
613 msg_Err( p_demux, "parent input could not be found" );
617 p_parent_input = input_GetItem( p_input );
619 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
620 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
622 vlc_mutex_lock( &p_parent_input->lock );
624 p_parent_input->i_type = ITEM_TYPE_NET;
626 if( p_playlist->status.p_item &&
627 p_playlist->status.p_item->p_input == p_parent_input )
629 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
630 p_playlist->status.p_node, p_playlist->status.p_item );
633 vlc_mutex_unlock( &p_parent_input->lock );
634 vlc_object_release( p_input );
635 vlc_object_release( p_playlist );
640 static int Control( demux_t *p_demux, int i_query, va_list args )
645 /**************************************************************
647 **************************************************************/
649 /* i_read is at least > 6 */
650 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
655 const uint8_t *end = buf + len;
658 assert (buf[len] == '\0');
663 uint8_t flags = buf[0];
665 /* First, check the sap announce is correct */
666 if ((flags >> 5) != 1)
669 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
670 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
674 msg_Dbg( p_sd, "encrypted packet, unsupported" );
678 vlc_bool_t b_compressed = (flags & 0x01) != 0;
680 uint16_t i_hash = U16_AT (buf + 2);
682 if( p_sd->p_sys->b_strict && i_hash == 0 )
684 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
688 // Skips source address and auth data
689 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
693 uint8_t *decomp = NULL;
696 int newsize = Decompress (buf, &decomp, end - buf);
699 msg_Dbg( p_sd, "decompression of SAP packet failed" );
703 decomp = realloc (decomp, newsize + 1);
704 decomp[newsize] = '\0';
705 psz_sdp = (const char *)decomp;
710 psz_sdp = (const char *)buf;
714 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
715 assert( psz_sdp[len] == '\0');
717 /* Skip payload type */
718 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
719 if (strncmp (psz_sdp, "v=0", 3))
721 size_t clen = strlen (psz_sdp) + 1;
723 if (strcmp (psz_sdp, "application/sdp"))
725 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
729 // skips content type
738 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
743 p_sdp->psz_sdp = psz_sdp;
745 /* Decide whether we should add a playlist item for this SDP */
746 /* Parse connection information (c= & m= ) */
747 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
748 p_sdp->psz_uri = NULL;
750 /* Multi-media or no-parse -> pass to LIVE.COM */
751 if( ( p_sdp->i_media_type != 14
752 && p_sdp->i_media_type != 32
753 && p_sdp->i_media_type != 33)
754 || p_sd->p_sys->b_parse == VLC_FALSE )
756 free( p_sdp->psz_uri );
757 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
758 p_sdp->psz_uri = NULL;
761 if( p_sdp->psz_uri == NULL ) return VLC_EGENERIC;
763 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
765 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
767 /* FIXME: we create a new announce each time the sdp changes */
768 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
770 /* We don't support delete announcement as they can easily
771 * Be used to highjack an announcement by a third party.
772 * Intead we cleverly implement Implicit Announcement removal.
774 * if( b_need_delete )
775 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
781 /* No need to go after six, as we start to trust the
782 * average period at six */
783 if( p_announce->i_period_trust <= 5 )
784 p_announce->i_period_trust++;
786 /* Compute the average period */
787 p_announce->i_period = (p_announce->i_period + (mdate() - p_announce->i_last)) / 2;
788 p_announce->i_last = mdate();
790 FreeSDP( p_sdp ); p_sdp = NULL;
795 CreateAnnounce( p_sd, i_hash, p_sdp );
801 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
804 input_item_t *p_input;
805 const char *psz_value;
806 sap_announce_t *p_sap = (sap_announce_t *)malloc(
807 sizeof(sap_announce_t ) );
808 services_discovery_sys_t *p_sys;
814 p_sap->i_last = mdate();
816 p_sap->i_period_trust = 0;
817 p_sap->i_hash = i_hash;
818 p_sap->p_sdp = p_sdp;
820 /* Create the actual playlist item here */
821 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
822 p_sap->p_sdp->psz_uri,
823 p_sdp->psz_sessionname,
824 0, NULL, -1, ITEM_TYPE_NET );
825 p_sap->i_input_id = p_input->i_id;
832 if( p_sys->b_timeshift )
833 input_ItemAddOption( p_input, ":access-filter=timeshift" );
835 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
836 if( psz_value != NULL )
838 input_ItemAddInfo( p_input, _("Session"), _("Tool"), "%s",
841 if( strcmp( p_sdp->username, "-" ) )
843 input_ItemAddInfo( p_input, _("Session"), _("User"), "%s",
848 if (p_sap->p_sdp->mediac >= 1)
849 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
851 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
853 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
855 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
861 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
864 /* Look for media attribute, and fallback to session */
865 return GetAttribute (sdp->mediav[media].pp_attributes,
866 sdp->mediav[media].i_attributes, name)
867 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
871 /* Fill p_sdp->psz_uri */
872 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
874 if (p_sdp->mediac == 0)
876 msg_Dbg (p_obj, "Ignoring SDP with no media");
880 for (unsigned i = 1; i < p_sdp->mediac; i++)
882 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
883 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
884 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
885 p_sdp->mediav->addrlen))
887 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
892 if (p_sdp->mediav->n_addr != 1)
894 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
903 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
904 p_sdp->mediav->addrlen, psz_uri + 1,
905 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
908 if (strchr (psz_uri + 1, ':'))
911 strcat (psz_uri, "]");
917 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
918 if (sdp_proto == NULL)
921 char *subtype = strchr (sdp_proto, ' ');
924 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
925 p_sdp->i_media_type = 0;
930 p_sdp->i_media_type = atoi (subtype);
932 if (p_sdp->i_media_type == 0)
933 p_sdp->i_media_type = 33;
935 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
936 * 0x1: Connection-Oriented media. */
937 static const char proto_match[] =
939 "RTP/AVP\0" "rtp\0\0"
940 "UDPLite/RTP/AVP\0" "udplite\0\0"
941 "DCCP/RTP/AVP\0" "dccp\0\1"
942 "TCP/RTP/AVP\0" "rtptcp\0\1"
945 const char *vlc_proto = NULL;
947 for (const char *proto = proto_match; *proto;)
949 if (strcasecmp (proto, sdp_proto) == 0)
951 vlc_proto = proto + strlen (proto) + 1;
952 flags = vlc_proto[strlen (vlc_proto) + 1];
955 proto += strlen (proto) + 1;
956 proto += strlen (proto) + 2;
960 if (vlc_proto == NULL)
962 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
963 p_sdp->mediav[0].fmt);
969 /* Connection-oriented media */
970 const char *setup = FindAttribute (p_sdp, 0, "setup");
972 setup = "active"; /* default value */
974 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
976 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
980 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
986 /* Non-connected (normally multicast) media */
988 char psz_source[258] = "";
989 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
992 char psz_source_ip[256];
995 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
998 /* According to RFC4570, FQDNs can be used for source-filters,
999 * but -seriously- this is impractical */
1005 struct in6_addr addr;
1006 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1007 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1008 sizeof (psz_source) - 2) != NULL))
1010 psz_source[0] = '[';
1011 psz_source[strlen (psz_source)] = ']';
1018 struct in_addr addr;
1019 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1020 && (inet_ntop (AF_INET, &addr, psz_source,
1021 sizeof (psz_source)) == NULL))
1029 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1038 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1039 socklen_t *addrlen, unsigned *number)
1042 unsigned fam, n1, n2;
1044 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1052 addr->ss_family = AF_INET6;
1056 *addrlen = sizeof (struct sockaddr_in6);
1058 if (inet_pton (AF_INET6, host,
1059 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1062 *number = (res >= 3) ? n1 : 1;
1067 addr->ss_family = AF_INET;
1071 *addrlen = sizeof (struct sockaddr_in);
1073 if (inet_pton (AF_INET, host,
1074 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1077 *number = (res >= 4) ? n2 : 1;
1087 /***********************************************************************
1088 * ParseSDP : SDP parsing
1089 * *********************************************************************
1090 * Validate SDP and parse all fields
1091 ***********************************************************************/
1092 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1094 if( psz_sdp == NULL )
1097 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1102 struct sockaddr_storage glob_addr;
1103 memset (&glob_addr, 0, sizeof (glob_addr));
1104 socklen_t glob_len = 0;
1105 unsigned glob_count = 1;
1108 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1111 /* Extract one line */
1112 char *eol = strchr (psz_sdp, '\n');
1113 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1114 char line[linelen + 1];
1115 memcpy (line, psz_sdp, linelen);
1116 line[linelen] = '\0';
1118 psz_sdp += linelen + 1;
1120 /* Remove carriage return if present */
1121 eol = strchr (line, '\r');
1124 linelen = eol - line;
1125 line[linelen] = '\0';
1129 char cat = line[0], *data = line + 2;
1130 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1132 /* MUST ignore SDP with unknown line type */
1133 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1138 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1142 assert (linelen >= 2);
1144 /* SDP parsing state machine
1145 * We INTERNALLY use uppercase for session, lowercase for media
1149 /* Session description */
1154 msg_Dbg (p_obj, "missing SDP version");
1157 if (strcmp (data, "0"))
1159 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1169 msg_Dbg (p_obj, "missing SDP originator");
1173 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1174 p_sdp->username, &p_sdp->session_id,
1175 &p_sdp->session_version, &p_sdp->orig_ip_version,
1176 p_sdp->orig_host) != 5)
1177 || ((p_sdp->orig_ip_version != 4)
1178 && (p_sdp->orig_ip_version != 6)))
1180 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1181 /* Or maybe out-of-range, but this looks suspicious */
1184 EnsureUTF8 (p_sdp->orig_host);
1191 if ((cat != 's') || !*data)
1193 /* MUST be present AND non-empty */
1194 msg_Dbg (p_obj, "missing SDP session name");
1197 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1198 p_sdp->psz_sessionname = strdup (data);
1199 EnsureUTF8 (p_sdp->psz_sessionname);
1200 if (p_sdp->psz_sessionname == NULL)
1225 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1228 msg_Dbg (p_obj, "SDP connection infos not supported: "
1235 assert (expect == 'B');
1242 msg_Dbg (p_obj, "missing SDP time description");
1248 if ((cat == 't') || (cat == 'r'))
1263 attribute_t *p_attr = MakeAttribute (data);
1264 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1268 /* Media description */
1275 msg_Dbg (p_obj, "missing SDP media description");
1278 struct sdp_media_t *m;
1279 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1287 memset (m, 0, sizeof (*m));
1288 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1289 m->n_addr = glob_count;
1291 /* TODO: remember media type (if we need multiple medias) */
1292 data = strchr (data, ' ');
1295 msg_Dbg (p_obj, "missing SDP media port");
1298 port = atoi (++data);
1299 if (port <= 0 || port >= 65536)
1301 msg_Dbg (p_obj, "invalid transport port %d", port);
1304 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1306 data = strchr (data, ' ');
1309 msg_Dbg (p_obj, "missing SDP media format");
1312 m->fmt = strdup (++data);
1326 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1327 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1330 msg_Dbg (p_obj, "SDP connection infos not supported: "
1334 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1346 assert (expect == 'a');
1349 attribute_t *p_attr = MakeAttribute (data);
1353 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1354 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1363 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1369 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1381 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1384 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1386 return VLC_EGENERIC;
1388 shutdown( i_fd, SHUT_WR );
1389 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1390 p_sd->p_sys->i_fd, i_fd);
1394 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1397 int i_result, i_dstsize, n = 0;
1398 unsigned char *psz_dst = NULL;
1401 memset (&d_stream, 0, sizeof (d_stream));
1403 i_result = inflateInit(&d_stream);
1404 if( i_result != Z_OK )
1407 d_stream.next_in = (Bytef *)psz_src;
1408 d_stream.avail_in = i_len;
1413 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1414 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1415 d_stream.avail_out = 1000;
1417 i_result = inflate(&d_stream, Z_NO_FLUSH);
1418 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1420 inflateEnd( &d_stream );
1424 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1425 ( i_result != Z_STREAM_END ) );
1427 i_dstsize = d_stream.total_out;
1428 inflateEnd( &d_stream );
1430 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1442 static void FreeSDP( sdp_t *p_sdp )
1444 free( p_sdp->psz_sessionname );
1445 free( p_sdp->psz_uri );
1447 for (unsigned j = 0; j < p_sdp->mediac; j++)
1449 free (p_sdp->mediav[j].fmt);
1450 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1451 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1452 free (p_sdp->mediav[j].pp_attributes);
1454 free (p_sdp->mediav);
1456 for (int i = 0; i < p_sdp->i_attributes; i++)
1457 FreeAttribute (p_sdp->pp_attributes[i]);
1459 free (p_sdp->pp_attributes);
1463 static int RemoveAnnounce( services_discovery_t *p_sd,
1464 sap_announce_t *p_announce )
1468 if( p_announce->p_sdp )
1470 FreeSDP( p_announce->p_sdp );
1471 p_announce->p_sdp = NULL;
1474 if( p_announce->i_input_id > -1 )
1475 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1477 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1479 if( p_sd->p_sys->pp_announces[i] == p_announce )
1481 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1492 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1494 /* A session is identified by
1497 * - network type (which is always IN),
1498 * - address type (currently, this means IP version),
1501 if (strcmp (p_sdp1->username, p_sdp2->username)
1502 || (p_sdp1->session_id != p_sdp2->session_id)
1503 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1504 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1511 static inline attribute_t *MakeAttribute (const char *str)
1513 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1517 strcpy (a->name, str);
1518 EnsureUTF8 (a->name);
1519 char *value = strchr (a->name, ':');
1531 static const char *GetAttribute (attribute_t **tab, unsigned n,
1534 for (unsigned i = 0; i < n; i++)
1535 if (strcasecmp (tab[i]->name, name) == 0)
1536 return tab[i]->value;
1541 static inline void FreeAttribute (attribute_t *a)