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
215 uint32_t i_source[4];
217 /* SAP annnounces must only contain one SDP */
223 struct services_discovery_sys_t
225 /* Socket descriptors */
229 /* Table of announces */
231 struct sap_announce_t **pp_announces;
236 vlc_bool_t b_timeshift;
246 /*****************************************************************************
248 *****************************************************************************/
252 static int Demux( demux_t *p_demux );
253 static int Control( demux_t *, int, va_list );
254 static void Run ( services_discovery_t *p_sd );
256 /* Main parsing functions */
257 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
258 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
259 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
260 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
261 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
263 /* Helper functions */
264 static inline attribute_t *MakeAttribute (const char *str);
265 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
266 static inline void FreeAttribute (attribute_t *a);
267 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
270 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
271 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
272 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
273 static void FreeSDP( sdp_t *p_sdp );
275 /*****************************************************************************
276 * Open: initialize and create stuff
277 *****************************************************************************/
278 static int Open( vlc_object_t *p_this )
280 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
281 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
282 malloc( sizeof( services_discovery_sys_t ) );
284 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
292 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
293 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
296 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
302 /* Cache sap_timeshift value */
303 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" );
306 services_discovery_SetLocalizedName( p_sd, _("SAP") );
308 p_sys->i_announces = 0;
309 p_sys->pp_announces = NULL;
314 /*****************************************************************************
315 * OpenDemux: initialize and create stuff
316 *****************************************************************************/
317 static int OpenDemux( vlc_object_t *p_this )
319 demux_t *p_demux = (demux_t *)p_this;
320 const uint8_t *p_peek;
321 char *psz_sdp = NULL;
323 int errval = VLC_EGENERIC;
326 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
328 /* We want livedotcom module to parse this SDP file */
332 assert( p_demux->s ); /* this is NOT an access_demux */
335 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
338 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
341 /* Gather the complete sdp file */
342 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
344 const int i_read_max = 1024;
345 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
347 if( psz_sdp_new == NULL )
352 psz_sdp = psz_sdp_new;
354 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
357 msg_Err( p_demux, "cannot read SDP" );
362 psz_sdp[i_len] = '\0';
364 if( i_read < i_read_max )
368 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
372 msg_Warn( p_demux, "invalid SDP");
376 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
378 p_sdp->psz_uri = NULL;
380 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
381 p_sdp->i_media_type != 14 )
384 if( p_sdp->psz_uri == NULL ) goto error;
386 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
387 p_demux->p_sys->p_sdp = p_sdp;
388 p_demux->pf_control = Control;
389 p_demux->pf_demux = Demux;
396 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
397 stream_Seek( p_demux->s, 0 );
401 /*****************************************************************************
403 *****************************************************************************/
404 static void Close( vlc_object_t *p_this )
406 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
407 services_discovery_sys_t *p_sys = p_sd->p_sys;
411 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
413 net_Close( p_sys->pi_fd[i] );
415 FREENULL( p_sys->pi_fd );
418 if( config_GetInt( p_sd, "sap-cache" ) )
424 for( i = p_sys->i_announces - 1; i>= 0; i-- )
426 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
428 FREENULL( p_sys->pp_announces );
434 /*****************************************************************************
435 * CloseDemux: Close the demuxer
436 *****************************************************************************/
437 static void CloseDemux( vlc_object_t *p_this )
439 demux_t *p_demux = (demux_t *)p_this;
442 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
443 free( p_demux->p_sys );
447 /*****************************************************************************
448 * Run: main SAP thread
449 *****************************************************************************
450 * Listens to SAP packets, and sends them to packet_handle
451 *****************************************************************************/
452 #define MAX_SAP_BUFFER 5000
454 static void Run( services_discovery_t *p_sd )
459 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
460 * DNS queries, even if the DNS server returns an error with milliseconds.
461 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
462 * Winsock 1.1 from Windows 95, if not Windows 3.1.
463 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
464 * we have to open sockets in Run() rather than Open(). */
465 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
467 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
468 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
469 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
470 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
472 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
474 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
477 struct if_nameindex *l = if_nameindex ();
480 char *ptr = strchr (psz_address, '%') + 1;
481 for (unsigned i = 0; l[i].if_index; i++)
483 strcpy (ptr, l[i].if_name);
484 InitSocket (p_sd, psz_address, SAP_PORT);
486 if_freenameindex (l);
489 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
490 which if_nameindex uses internally anyway */
492 // first create a dummy socket to pin down the protocol family
493 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
494 if( s != INVALID_SOCKET )
496 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
497 size_t len = sizeof(ifaces);
499 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
501 unsigned ifcount = len/sizeof(INTERFACE_INFO);
502 char *ptr = strchr (psz_address, '%') + 1;
503 for(unsigned i = 1; i<=ifcount; ++i )
505 // append link-local zone identifier
506 sprintf(ptr, "%d", i);
512 *strchr (psz_address, '%') = '\0';
514 static const char ipv6_scopes[] = "1456789ABCDE";
515 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
517 psz_address[3] = *c_scope;
518 InitSocket( p_sd, psz_address, SAP_PORT );
522 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
523 if( psz_addr && *psz_addr )
525 InitSocket( p_sd, psz_addr, SAP_PORT );
529 if( p_sd->p_sys->i_fd == 0 )
531 msg_Err( p_sd, "unable to listen on any address" );
535 /* read SAP packets */
536 while( !p_sd->b_die )
539 uint8_t p_buffer[MAX_SAP_BUFFER+1];
541 i_read = net_Select( p_sd, p_sd->p_sys->pi_fd,
542 p_sd->p_sys->i_fd, p_buffer,
545 /* Check for items that need deletion */
546 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
548 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
550 if( mdate() - p_sd->p_sys->pp_announces[i]->i_last > i_timeout )
552 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i] );
556 /* Minimum length is > 6 */
561 msg_Warn( p_sd, "socket read error" );
566 p_buffer[i_read] = '\0';
568 /* Parse the packet */
569 ParseSAP( p_sd, p_buffer, i_read );
573 /**********************************************************************
574 * Demux: reads and demuxes data packets
575 * Return -1 if error, 0 if EOF, 1 else
576 **********************************************************************/
577 static int Demux( demux_t *p_demux )
579 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
580 input_thread_t *p_input;
581 input_item_t *p_parent_input;
583 playlist_t *p_playlist = pl_Yield( p_demux );
584 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
589 msg_Err( p_demux, "parent input could not be found" );
593 p_parent_input = input_GetItem( p_input );
595 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
596 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
598 vlc_mutex_lock( &p_parent_input->lock );
600 p_parent_input->i_type = ITEM_TYPE_NET;
602 if( p_playlist->status.p_item &&
603 p_playlist->status.p_item->p_input == p_parent_input )
605 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
606 p_playlist->status.p_node, p_playlist->status.p_item );
609 vlc_mutex_unlock( &p_parent_input->lock );
610 vlc_object_release( p_input );
611 vlc_object_release( p_playlist );
616 static int Control( demux_t *p_demux, int i_query, va_list args )
621 /**************************************************************
623 **************************************************************/
625 /* i_read is at least > 6 */
626 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
631 const uint8_t *end = buf + len;
634 assert (buf[len] == '\0');
639 uint8_t flags = buf[0];
641 /* First, check the sap announce is correct */
642 if ((flags >> 5) != 1)
645 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
646 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
650 msg_Dbg( p_sd, "encrypted packet, unsupported" );
654 vlc_bool_t b_compressed = (flags & 0x01) != 0;
656 uint16_t i_hash = U16_AT (buf + 2);
658 if( p_sd->p_sys->b_strict && i_hash == 0 )
660 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
664 // Skips source address and auth data
665 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
669 uint8_t *decomp = NULL;
672 int newsize = Decompress (buf, &decomp, end - buf);
675 msg_Dbg( p_sd, "decompression of SAP packet failed" );
679 decomp = realloc (decomp, newsize + 1);
680 decomp[newsize] = '\0';
681 psz_sdp = (const char *)decomp;
686 psz_sdp = (const char *)buf;
690 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
691 assert( psz_sdp[len] == '\0');
693 /* Skip payload type */
694 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
695 if (strncmp (psz_sdp, "v=0", 3))
697 size_t clen = strlen (psz_sdp) + 1;
699 if (strcmp (psz_sdp, "application/sdp"))
701 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
705 // skips content type
714 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
719 p_sdp->psz_sdp = psz_sdp;
721 /* Decide whether we should add a playlist item for this SDP */
722 /* Parse connection information (c= & m= ) */
723 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
724 p_sdp->psz_uri = NULL;
726 /* Multi-media or no-parse -> pass to LIVE.COM */
727 if( ( p_sdp->i_media_type != 14
728 && p_sdp->i_media_type != 32
729 && p_sdp->i_media_type != 33)
730 || p_sd->p_sys->b_parse == VLC_FALSE )
732 free( p_sdp->psz_uri );
733 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
734 p_sdp->psz_uri = NULL;
737 if( p_sdp->psz_uri == NULL ) return VLC_EGENERIC;
739 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
742 /* FIXME: we create a new announce each time the sdp changes */
743 if( IsSameSession( p_sd->p_sys->pp_announces[i]->p_sdp, p_sdp ) )
747 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
751 p_sd->p_sys->pp_announces[i]->i_last = mdate();
753 FreeSDP( p_sdp ); p_sdp = NULL;
758 CreateAnnounce( p_sd, i_hash, p_sdp );
764 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
767 input_item_t *p_input;
768 const char *psz_value;
769 sap_announce_t *p_sap = (sap_announce_t *)malloc(
770 sizeof(sap_announce_t ) );
771 services_discovery_sys_t *p_sys;
777 p_sap->i_last = mdate();
778 p_sap->i_hash = i_hash;
779 p_sap->p_sdp = p_sdp;
781 /* Create the actual playlist item here */
782 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
783 p_sap->p_sdp->psz_uri,
784 p_sdp->psz_sessionname,
785 0, NULL, -1, ITEM_TYPE_NET );
786 p_sap->i_input_id = p_input->i_id;
793 if( p_sys->b_timeshift )
794 input_ItemAddOption( p_input, ":access-filter=timeshift" );
796 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
797 if( psz_value != NULL )
799 input_ItemAddInfo( p_input, _("Session"), _("Tool"), "%s",
802 if( strcmp( p_sdp->username, "-" ) )
804 input_ItemAddInfo( p_input, _("Session"), _("User"), "%s",
809 if (p_sap->p_sdp->mediac >= 1)
810 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
812 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
814 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
816 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
822 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
825 /* Look for media attribute, and fallback to session */
826 return GetAttribute (sdp->mediav[media].pp_attributes,
827 sdp->mediav[media].i_attributes, name)
828 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
832 /* Fill p_sdp->psz_uri */
833 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
835 if (p_sdp->mediac == 0)
837 msg_Dbg (p_obj, "Ignoring SDP with no media");
841 for (unsigned i = 1; i < p_sdp->mediac; i++)
843 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
844 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
845 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
846 p_sdp->mediav->addrlen))
848 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
853 if (p_sdp->mediav->n_addr != 1)
855 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
864 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
865 p_sdp->mediav->addrlen, psz_uri + 1,
866 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
869 if (strchr (psz_uri + 1, ':'))
872 psz_uri[strlen (psz_uri)] = ']';
878 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
879 if (sdp_proto == NULL)
882 char *subtype = strchr (sdp_proto, ' ');
885 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
886 p_sdp->i_media_type = 0;
891 p_sdp->i_media_type = atoi (subtype);
893 if (p_sdp->i_media_type == 0)
894 p_sdp->i_media_type = 33;
896 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
897 * 0x1: Connection-Oriented media. */
898 static const char proto_match[] =
900 "RTP/AVP\0" "rtp\0\0"
901 "UDPLite/RTP/AVP\0" "udplite\0\0"
902 "DCCP/RTP/AVP\0" "dccp\0\1"
903 "TCP/RTP/AVP\0" "rtptcp\0\1"
906 const char *vlc_proto = NULL;
908 for (const char *proto = proto_match; *proto;)
910 if (strcasecmp (proto, sdp_proto) == 0)
912 vlc_proto = proto + strlen (proto) + 1;
913 flags = vlc_proto[strlen (vlc_proto) + 1];
916 proto += strlen (proto) + 1;
917 proto += strlen (proto) + 2;
921 if (vlc_proto == NULL)
923 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
924 p_sdp->mediav[0].fmt);
930 /* Connection-oriented media */
931 const char *setup = FindAttribute (p_sdp, 0, "setup");
933 setup = "active"; /* default value */
935 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
937 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
941 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
947 /* Non-connected (normally multicast) media */
949 char psz_source[258] = "";
950 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
953 char psz_source_ip[256];
956 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
959 /* According to RFC4570, FQDNs can be used for source-filters,
960 * but -seriously- this is impractical */
966 struct in6_addr addr;
967 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
968 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
969 sizeof (psz_source) - 2) != NULL))
972 psz_source[strlen (psz_source)] = ']';
980 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
981 && (inet_ntop (AF_INET, &addr, psz_source,
982 sizeof (psz_source)) == NULL))
990 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
999 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1000 socklen_t *addrlen, unsigned *number)
1003 unsigned fam, n1, n2;
1005 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1013 addr->ss_family = AF_INET6;
1017 *addrlen = sizeof (struct sockaddr_in6);
1019 if (inet_pton (AF_INET6, host,
1020 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1023 *number = (res >= 3) ? n1 : 1;
1028 addr->ss_family = AF_INET;
1032 *addrlen = sizeof (struct sockaddr_in);
1034 if (inet_pton (AF_INET, host,
1035 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1038 *number = (res >= 4) ? n2 : 1;
1048 /***********************************************************************
1049 * ParseSDP : SDP parsing
1050 * *********************************************************************
1051 * Validate SDP and parse all fields
1052 ***********************************************************************/
1053 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1055 if( psz_sdp == NULL )
1058 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1063 struct sockaddr_storage glob_addr;
1064 memset (&glob_addr, 0, sizeof (glob_addr));
1065 socklen_t glob_len = 0;
1066 unsigned glob_count = 1;
1069 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1072 /* Extract one line */
1073 char *eol = strchr (psz_sdp, '\n');
1074 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1075 char line[linelen + 1];
1076 memcpy (line, psz_sdp, linelen);
1077 line[linelen] = '\0';
1079 psz_sdp += linelen + 1;
1081 /* Remove carriage return if present */
1082 eol = strchr (line, '\r');
1085 linelen = eol - line;
1086 line[linelen] = '\0';
1090 char cat = line[0], *data = line + 2;
1091 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1093 /* MUST ignore SDP with unknown line type */
1094 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1099 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1103 assert (linelen >= 2);
1105 /* SDP parsing state machine
1106 * We INTERNALLY use uppercase for session, lowercase for media
1110 /* Session description */
1115 msg_Dbg (p_obj, "missing SDP version");
1118 if (strcmp (data, "0"))
1120 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1130 msg_Dbg (p_obj, "missing SDP originator");
1134 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1135 p_sdp->username, &p_sdp->session_id,
1136 &p_sdp->session_version, &p_sdp->orig_ip_version,
1137 p_sdp->orig_host) != 5)
1138 || ((p_sdp->orig_ip_version != 4)
1139 && (p_sdp->orig_ip_version != 6)))
1141 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1142 /* Or maybe out-of-range, but this looks suspicious */
1145 EnsureUTF8 (p_sdp->orig_host);
1152 if ((cat != 's') || !*data)
1154 /* MUST be present AND non-empty */
1155 msg_Dbg (p_obj, "missing SDP session name");
1158 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1159 p_sdp->psz_sessionname = strdup (data);
1160 EnsureUTF8 (p_sdp->psz_sessionname);
1161 if (p_sdp->psz_sessionname == NULL)
1186 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1189 msg_Dbg (p_obj, "SDP connection infos not supported: "
1196 assert (expect == 'B');
1203 msg_Dbg (p_obj, "missing SDP time description");
1209 if ((cat == 't') || (cat == 'r'))
1224 attribute_t *p_attr = MakeAttribute (data);
1225 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1229 /* Media description */
1236 msg_Dbg (p_obj, "missing SDP media description");
1239 struct sdp_media_t *m;
1240 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1248 memset (m, 0, sizeof (*m));
1249 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1250 m->n_addr = glob_count;
1252 /* TODO: remember media type (if we need multiple medias) */
1253 data = strchr (data, ' ');
1256 msg_Dbg (p_obj, "missing SDP media port");
1259 port = atoi (++data);
1260 if (port <= 0 || port >= 65536)
1262 msg_Dbg (p_obj, "invalid transport port %d", port);
1265 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1267 data = strchr (data, ' ');
1270 msg_Dbg (p_obj, "missing SDP media format");
1273 m->fmt = strdup (++data);
1287 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1288 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1291 msg_Dbg (p_obj, "SDP connection infos not supported: "
1295 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1307 assert (expect == 'a');
1310 attribute_t *p_attr = MakeAttribute (data);
1314 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1315 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1324 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1330 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1342 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1345 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1347 return VLC_EGENERIC;
1349 shutdown( i_fd, SHUT_WR );
1350 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1351 p_sd->p_sys->i_fd, i_fd);
1355 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1358 int i_result, i_dstsize, n = 0;
1359 unsigned char *psz_dst = NULL;
1362 memset (&d_stream, 0, sizeof (d_stream));
1364 i_result = inflateInit(&d_stream);
1365 if( i_result != Z_OK )
1368 d_stream.next_in = (Bytef *)psz_src;
1369 d_stream.avail_in = i_len;
1374 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1375 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1376 d_stream.avail_out = 1000;
1378 i_result = inflate(&d_stream, Z_NO_FLUSH);
1379 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1381 inflateEnd( &d_stream );
1385 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1386 ( i_result != Z_STREAM_END ) );
1388 i_dstsize = d_stream.total_out;
1389 inflateEnd( &d_stream );
1391 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1403 static void FreeSDP( sdp_t *p_sdp )
1405 free( p_sdp->psz_sessionname );
1406 free( p_sdp->psz_uri );
1408 for (unsigned j = 0; j < p_sdp->mediac; j++)
1410 free (p_sdp->mediav[j].fmt);
1411 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1412 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1413 free (p_sdp->mediav[j].pp_attributes);
1415 free (p_sdp->mediav);
1417 for (int i = 0; i < p_sdp->i_attributes; i++)
1418 FreeAttribute (p_sdp->pp_attributes[i]);
1420 free (p_sdp->pp_attributes);
1424 static int RemoveAnnounce( services_discovery_t *p_sd,
1425 sap_announce_t *p_announce )
1429 if( p_announce->p_sdp )
1431 FreeSDP( p_announce->p_sdp );
1432 p_announce->p_sdp = NULL;
1435 if( p_announce->i_input_id > -1 )
1436 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1438 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1440 if( p_sd->p_sys->pp_announces[i] == p_announce )
1442 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1453 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1455 /* A session is identified by
1458 * - network type (which is always IN),
1459 * - address type (currently, this means IP version),
1462 if (strcmp (p_sdp1->username, p_sdp2->username)
1463 || (p_sdp1->session_id != p_sdp2->session_id)
1464 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1465 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1472 static inline attribute_t *MakeAttribute (const char *str)
1474 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1478 strcpy (a->name, str);
1479 EnsureUTF8 (a->name);
1480 char *value = strchr (a->name, ':');
1492 static const char *GetAttribute (attribute_t **tab, unsigned n,
1495 for (unsigned i = 0; i < n; i++)
1496 if (strcasecmp (tab[i]->name, name) == 0)
1497 return tab[i]->value;
1502 static inline void FreeAttribute (attribute_t *a)