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 *****************************************************************************/
30 #include <stdlib.h> /* malloc(), free() */
33 #include <vlc_playlist.h>
34 #include <vlc_demux.h>
36 #include <vlc_network.h>
37 #include <vlc_charset.h>
45 #ifdef HAVE_SYS_TIME_H
46 # include <sys/time.h>
57 /************************************************************************
58 * Macros and definitions
59 ************************************************************************/
61 #define MAX_LINE_LENGTH 256
63 /* SAP is always on that port */
65 /* Global-scope SAP address */
66 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
67 /* Organization-local SAP address */
68 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
69 /* Local (smallest non-link-local scope) SAP address */
70 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
71 /* Link-local SAP address */
72 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
75 /*****************************************************************************
77 *****************************************************************************/
78 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
79 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
80 "right addresses to listen to. However, you " \
81 "can specify a specific address." )
82 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
83 #define SAP_IPV4_LONGTEXT N_( \
84 "Listen to IPv4 announcements " \
85 "on the standard address." )
86 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
87 #define SAP_IPV6_LONGTEXT N_( \
88 "Listen to IPv6 announcements " \
89 "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 file parser for UDP") );
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
218 uint32_t i_source[4];
220 /* SAP annnounces must only contain one SDP */
228 struct services_discovery_sys_t
230 /* Socket descriptors */
235 playlist_item_t *p_node_cat;
236 playlist_item_t *p_node_one;
238 /* Table of announces */
240 struct sap_announce_t **pp_announces;
245 vlc_bool_t b_timeshift;
255 /*****************************************************************************
257 *****************************************************************************/
261 static int Demux( demux_t *p_demux );
262 static int Control( demux_t *, int, va_list );
263 static void Run ( services_discovery_t *p_sd );
265 /* Main parsing functions */
266 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
267 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
268 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
269 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
270 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
272 /* Helper functions */
273 static inline attribute_t *MakeAttribute (const char *str);
274 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
275 static inline void FreeAttribute (attribute_t *a);
276 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
279 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
280 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
281 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
282 static void FreeSDP( sdp_t *p_sdp );
284 /*****************************************************************************
285 * Open: initialize and create stuff
286 *****************************************************************************/
287 static int Open( vlc_object_t *p_this )
289 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
290 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
291 malloc( sizeof( services_discovery_sys_t ) );
293 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
301 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
302 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
305 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
311 /* Cache sap_timeshift value */
312 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" )
313 ? VLC_TRUE : VLC_FALSE;
315 /* Create our playlist node */
318 playlist_NodesPairCreate( pl_Get( p_sd ), _("SAP sessions"),
319 &p_sys->p_node_cat, &p_sys->p_node_one,
321 p_sys->p_node_cat->p_input->b_prefers_tree = VLC_TRUE;
322 p_sys->i_announces = 0;
323 p_sys->pp_announces = NULL;
328 /*****************************************************************************
329 * OpenDemux: initialize and create stuff
330 *****************************************************************************/
331 static int OpenDemux( vlc_object_t *p_this )
333 demux_t *p_demux = (demux_t *)p_this;
335 int i_max_sdp = 1024;
337 char *psz_sdp = NULL;
340 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
342 /* We want livedotcom module to parse this SDP file */
349 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 ) return VLC_EGENERIC;
351 if( strncmp( (char*)p_peek, "v=0\r\n", 5 ) &&
352 strncmp( (char*)p_peek, "v=0\n", 4 ) &&
353 ( p_peek[0] < 'a' || p_peek[0] > 'z' || p_peek[1] != '=' ) )
359 psz_sdp = (char *)malloc( i_max_sdp );
360 if( !psz_sdp ) return VLC_EGENERIC;
362 /* Gather the complete sdp file */
365 int i_read = stream_Read( p_demux->s,
366 &psz_sdp[i_sdp], i_max_sdp - i_sdp - 1 );
370 msg_Err( p_demux, "failed to read SDP" );
376 if( i_read < i_max_sdp - i_sdp - 1 )
378 psz_sdp[i_sdp] = '\0';
383 psz_sdp = (char *)realloc( psz_sdp, i_max_sdp );
386 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
390 msg_Warn( p_demux, "invalid SDP");
394 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
396 p_sdp->psz_uri = NULL;
398 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
399 p_sdp->i_media_type != 14 )
402 if( p_sdp->psz_uri == NULL ) goto error;
404 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
405 p_demux->p_sys->p_sdp = p_sdp;
406 p_demux->pf_control = Control;
407 p_demux->pf_demux = Demux;
414 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
415 stream_Seek( p_demux->s, 0 );
419 /*****************************************************************************
421 *****************************************************************************/
422 static void Close( vlc_object_t *p_this )
424 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
425 services_discovery_sys_t *p_sys = p_sd->p_sys;
429 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
431 net_Close( p_sys->pi_fd[i] );
433 FREENULL( p_sys->pi_fd );
436 if( config_GetInt( p_sd, "sap-cache" ) )
442 for( i = p_sys->i_announces - 1; i>= 0; i-- )
444 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
446 FREENULL( p_sys->pp_announces );
448 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_cat, VLC_TRUE,
450 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_one, VLC_TRUE,
456 /*****************************************************************************
457 * CloseDemux: Close the demuxer
458 *****************************************************************************/
459 static void CloseDemux( vlc_object_t *p_this )
461 demux_t *p_demux = (demux_t *)p_this;
464 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
465 free( p_demux->p_sys );
469 /*****************************************************************************
470 * Run: main SAP thread
471 *****************************************************************************
472 * Listens to SAP packets, and sends them to packet_handle
473 *****************************************************************************/
474 #define MAX_SAP_BUFFER 5000
476 static void Run( services_discovery_t *p_sd )
481 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
482 * DNS queries, even if the DNS server returns an error with milliseconds.
483 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
484 * Winsock 1.1 from Windows 95, if not Windows 3.1.
485 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
486 * we have to open sockets in Run() rather than Open(). */
487 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
489 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
490 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
491 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
492 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
494 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
496 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
499 struct if_nameindex *l = if_nameindex ();
502 char *ptr = strchr (psz_address, '%') + 1;
503 for (unsigned i = 0; l[i].if_index; i++)
505 strcpy (ptr, l[i].if_name);
506 InitSocket (p_sd, psz_address, SAP_PORT);
508 if_freenameindex (l);
511 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
512 which if_nameindex uses internally anyway */
514 // first create a dummy socket to pin down the protocol family
515 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
516 if( s != INVALID_SOCKET )
518 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
519 size_t len = sizeof(ifaces);
521 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
523 unsigned ifcount = len/sizeof(INTERFACE_INFO);
524 char *ptr = strchr (psz_address, '%') + 1;
525 for(unsigned i = 1; i<=ifcount; ++i )
527 // append link-local zone identifier
528 sprintf(ptr, "%d", i);
534 *strchr (psz_address, '%') = '\0';
536 static const char ipv6_scopes[] = "1456789ABCDE";
537 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
539 psz_address[3] = *c_scope;
540 InitSocket( p_sd, psz_address, SAP_PORT );
544 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
545 if( psz_addr && *psz_addr )
547 InitSocket( p_sd, psz_addr, SAP_PORT );
551 if( p_sd->p_sys->i_fd == 0 )
553 msg_Err( p_sd, "unable to listen on any address" );
557 /* read SAP packets */
558 while( !p_sd->b_die )
561 uint8_t p_buffer[MAX_SAP_BUFFER+1];
563 i_read = net_Select( p_sd, p_sd->p_sys->pi_fd,
564 p_sd->p_sys->i_fd, p_buffer,
567 /* Check for items that need deletion */
568 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
570 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
572 if( mdate() - p_sd->p_sys->pp_announces[i]->i_last > i_timeout )
574 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i] );
578 /* Minimum length is > 6 */
583 msg_Warn( p_sd, "socket read error" );
588 p_buffer[i_read] = '\0';
590 /* Parse the packet */
591 ParseSAP( p_sd, p_buffer, i_read );
595 /**********************************************************************
596 * Demux: reads and demuxes data packets
597 * Return -1 if error, 0 if EOF, 1 else
598 **********************************************************************/
599 static int Demux( demux_t *p_demux )
601 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
602 input_thread_t *p_input;
603 input_item_t *p_parent_input;
605 playlist_t *p_playlist = pl_Yield( p_demux );
606 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
611 msg_Err( p_demux, "parent input could not be found" );
615 p_parent_input = input_GetItem(p_input);
617 vlc_mutex_lock( &p_parent_input->lock );
618 FREENULL( p_parent_input->psz_uri );
619 p_parent_input->psz_uri = strdup( p_sdp->psz_uri );
620 FREENULL( p_parent_input->psz_name );
621 p_parent_input->psz_name = strdup( p_sdp->psz_sessionname );
622 p_parent_input->i_type = ITEM_TYPE_NET;
624 if( p_playlist->status.p_item &&
625 p_playlist->status.p_item->p_input == p_parent_input )
627 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
628 p_playlist->status.p_node, p_playlist->status.p_item );
631 vlc_mutex_unlock( &p_parent_input->lock );
632 vlc_object_release( p_input );
633 vlc_object_release( p_playlist );
638 static int Control( demux_t *p_demux, int i_query, va_list args )
643 /**************************************************************
645 **************************************************************/
647 /* i_read is at least > 6 */
648 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
653 const uint8_t *end = buf + len;
656 assert (buf[len] == '\0');
661 uint8_t flags = buf[0];
663 /* First, check the sap announce is correct */
664 if ((flags >> 5) != 1)
667 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
668 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
672 msg_Dbg( p_sd, "encrypted packet, unsupported" );
676 vlc_bool_t b_compressed = (flags & 0x01) != 0;
678 uint16_t i_hash = U16_AT (buf + 2);
680 if( p_sd->p_sys->b_strict && i_hash == 0 )
682 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
686 // Skips source address and auth data
687 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
691 uint8_t *decomp = NULL;
694 int newsize = Decompress (buf, &decomp, end - buf);
697 msg_Dbg( p_sd, "decompression of SAP packet failed" );
701 decomp = realloc (decomp, newsize + 1);
702 decomp[newsize] = '\0';
703 psz_sdp = (const char *)decomp;
708 psz_sdp = (const char *)buf;
712 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
713 assert( psz_sdp[len] == '\0');
715 /* Skip payload type */
716 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
717 if (strncmp (psz_sdp, "v=0", 3))
719 size_t clen = strlen (psz_sdp) + 1;
721 if (strcmp (psz_sdp, "application/sdp"))
723 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
727 // skips content type
736 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
741 p_sdp->psz_sdp = psz_sdp;
743 /* Decide whether we should add a playlist item for this SDP */
744 /* Parse connection information (c= & m= ) */
745 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
746 p_sdp->psz_uri = NULL;
748 /* Multi-media or no-parse -> pass to LIVE.COM */
749 if( ( p_sdp->i_media_type != 14
750 && p_sdp->i_media_type != 32
751 && p_sdp->i_media_type != 33)
752 || p_sd->p_sys->b_parse == VLC_FALSE )
754 free( p_sdp->psz_uri );
755 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
756 p_sdp->psz_uri = NULL;
759 if( p_sdp->psz_uri == NULL ) return VLC_EGENERIC;
761 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
764 /* FIXME: we create a new announce each time the sdp changes */
765 if( IsSameSession( p_sd->p_sys->pp_announces[i]->p_sdp, p_sdp ) )
769 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
773 p_sd->p_sys->pp_announces[i]->i_last = mdate();
775 FreeSDP( p_sdp ); p_sdp = NULL;
780 CreateAnnounce( p_sd, i_hash, p_sdp );
786 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
789 input_item_t *p_input;
790 playlist_item_t *p_item, *p_child;
791 const char *psz_value;
792 sap_announce_t *p_sap = (sap_announce_t *)malloc(
793 sizeof(sap_announce_t ) );
794 services_discovery_sys_t *p_sys;
800 p_sap->i_last = mdate();
801 p_sap->i_hash = i_hash;
802 p_sap->p_sdp = p_sdp;
804 /* Create the actual playlist item here */
805 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
806 p_sap->p_sdp->psz_uri,
807 p_sdp->psz_sessionname,
808 0, NULL, -1, ITEM_TYPE_NET );
809 p_sap->i_input_id = p_input->i_id;
816 if( p_sys->b_timeshift )
817 input_ItemAddOption( p_input, ":access-filter=timeshift" );
819 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
820 if( psz_value != NULL )
822 input_ItemAddInfo( p_input, _("Session"),_("Tool"), psz_value );
824 if( strcmp( p_sdp->username, "-" ) )
826 input_ItemAddInfo( p_input, _("Session"),
827 _("User"), p_sdp->username );
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 if( psz_value != NULL )
838 p_child = playlist_ChildSearchName( p_sys->p_node_cat, psz_value );
840 if( p_child == NULL )
842 p_child = playlist_NodeCreate( pl_Get( p_sd ), psz_value,
843 p_sys->p_node_cat, 0 );
844 p_child->i_flags &= ~PLAYLIST_SKIP_FLAG;
849 p_child = p_sys->p_node_cat;
852 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input, p_child,
853 PLAYLIST_APPEND, PLAYLIST_END, VLC_FALSE );
854 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
855 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
856 p_sap->i_item_id_cat = p_item->i_id;
858 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input,
859 p_sys->p_node_one, PLAYLIST_APPEND, PLAYLIST_END,
861 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
862 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
863 p_sap->i_item_id_one = p_item->i_id;
865 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
871 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
874 /* Look for media attribute, and fallback to session */
875 return GetAttribute (sdp->mediav[media].pp_attributes,
876 sdp->mediav[media].i_attributes, name)
877 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
881 /* Fill p_sdp->psz_uri */
882 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
884 if (p_sdp->mediac == 0)
886 msg_Dbg (p_obj, "Ignoring SDP with no media");
890 for (unsigned i = 1; i < p_sdp->mediac; i++)
892 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
893 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
894 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
895 p_sdp->mediav->addrlen))
897 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
902 if (p_sdp->mediav->n_addr != 1)
904 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
913 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
914 p_sdp->mediav->addrlen, psz_uri + 1,
915 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
918 if (strchr (psz_uri + 1, ':'))
921 psz_uri[strlen (psz_uri)] = ']';
927 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
928 if (sdp_proto == NULL)
931 char *subtype = strchr (sdp_proto, ' ');
934 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
935 p_sdp->i_media_type = 0;
940 p_sdp->i_media_type = atoi (subtype);
942 if (p_sdp->i_media_type == 0)
943 p_sdp->i_media_type = 33;
945 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
946 * 0x1: Connection-Oriented media. */
947 static const char proto_match[] =
949 "RTP/AVP\0" "rtp\0\0"
950 "UDPLite/RTP/AVP\0" "udplite\0\0"
951 "DCCP/RTP/AVP\0" "dccp\0\1"
952 "TCP/RTP/AVP\0" "rtptcp\0\1"
955 const char *vlc_proto = NULL;
957 for (const char *proto = proto_match; *proto;)
959 if (strcasecmp (proto, sdp_proto) == 0)
961 vlc_proto = proto + strlen (proto) + 1;
962 flags = vlc_proto[strlen (vlc_proto) + 1];
965 proto += strlen (proto) + 1;
966 proto += strlen (proto) + 2;
970 if (vlc_proto == NULL)
972 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
973 p_sdp->mediav[0].fmt);
979 /* Connection-oriented media */
980 const char *setup = FindAttribute (p_sdp, 0, "setup");
982 setup = "active"; /* default value */
984 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
986 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
990 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
996 /* Non-connected (normally multicast) media */
998 char psz_source[258] = "";
999 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1000 if (sfilter != NULL)
1002 char psz_source_ip[256];
1005 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1006 psz_source_ip) == 2)
1008 /* According to RFC4570, FQDNs can be used for source-filters,
1009 * but -seriously- this is impractical */
1015 struct in6_addr addr;
1016 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1017 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1018 sizeof (psz_source) - 2) != NULL))
1020 psz_source[0] = '[';
1021 psz_source[strlen (psz_source)] = ']';
1028 struct in_addr addr;
1029 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1030 && (inet_ntop (AF_INET, &addr, psz_source,
1031 sizeof (psz_source)) == NULL))
1039 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1048 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1049 socklen_t *addrlen, unsigned *number)
1052 unsigned fam, n1, n2;
1054 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1062 addr->ss_family = AF_INET6;
1066 *addrlen = sizeof (struct sockaddr_in6);
1068 if (inet_pton (AF_INET6, host,
1069 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1072 *number = (res >= 3) ? n1 : 1;
1077 addr->ss_family = AF_INET;
1081 *addrlen = sizeof (struct sockaddr_in);
1083 if (inet_pton (AF_INET, host,
1084 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1087 *number = (res >= 4) ? n2 : 1;
1097 /***********************************************************************
1098 * ParseSDP : SDP parsing
1099 * *********************************************************************
1100 * Validate SDP and parse all fields
1101 ***********************************************************************/
1102 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1104 if( psz_sdp == NULL )
1107 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1112 struct sockaddr_storage glob_addr;
1113 memset (&glob_addr, 0, sizeof (glob_addr));
1114 socklen_t glob_len = 0;
1115 unsigned glob_count = 1;
1118 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1121 /* Extract one line */
1122 char *eol = strchr (psz_sdp, '\n');
1123 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1124 char line[linelen + 1];
1125 memcpy (line, psz_sdp, linelen);
1126 line[linelen] = '\0';
1128 psz_sdp += linelen + 1;
1130 /* Remove carriage return if present */
1131 eol = strchr (line, '\r');
1134 linelen = eol - line;
1135 line[linelen] = '\0';
1139 char cat = line[0], *data = line + 2;
1140 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1142 /* MUST ignore SDP with unknown line type */
1143 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1148 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1152 assert (linelen >= 2);
1154 /* SDP parsing state machine
1155 * We INTERNALLY use uppercase for session, lowercase for media
1159 /* Session description */
1164 msg_Dbg (p_obj, "missing SDP version");
1167 if (strcmp (data, "0"))
1169 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1179 msg_Dbg (p_obj, "missing SDP originator");
1183 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1184 p_sdp->username, &p_sdp->session_id,
1185 &p_sdp->session_version, &p_sdp->orig_ip_version,
1186 p_sdp->orig_host) != 5)
1187 || ((p_sdp->orig_ip_version != 4)
1188 && (p_sdp->orig_ip_version != 6)))
1190 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1191 /* Or maybe out-of-range, but this looks suspicious */
1194 EnsureUTF8 (p_sdp->orig_host);
1201 if ((cat != 's') || !*data)
1203 /* MUST be present AND non-empty */
1204 msg_Dbg (p_obj, "missing SDP session name");
1207 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1208 p_sdp->psz_sessionname = strdup (data);
1209 EnsureUTF8 (p_sdp->psz_sessionname);
1210 if (p_sdp->psz_sessionname == NULL)
1235 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1238 msg_Dbg (p_obj, "SDP connection infos not supported: "
1245 assert (expect == 'B');
1252 msg_Dbg (p_obj, "missing SDP time description");
1258 if ((cat == 't') || (cat == 'r'))
1273 attribute_t *p_attr = MakeAttribute (data);
1274 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1278 /* Media description */
1285 msg_Dbg (p_obj, "missing SDP media description");
1288 struct sdp_media_t *m;
1289 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1297 memset (m, 0, sizeof (*m));
1298 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1299 m->n_addr = glob_count;
1301 /* TODO: remember media type (if we need multiple medias) */
1302 data = strchr (data, ' ');
1305 msg_Dbg (p_obj, "missing SDP media port");
1308 port = atoi (++data);
1309 if (port <= 0 || port >= 65536)
1311 msg_Dbg (p_obj, "invalid transport port %d", port);
1314 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1316 data = strchr (data, ' ');
1319 msg_Dbg (p_obj, "missing SDP media format");
1322 m->fmt = strdup (++data);
1336 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1337 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1340 msg_Dbg (p_obj, "SDP connection infos not supported: "
1344 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1356 assert (expect == 'a');
1359 attribute_t *p_attr = MakeAttribute (data);
1363 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1364 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1373 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1379 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1391 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1394 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1396 return VLC_EGENERIC;
1398 shutdown( i_fd, SHUT_WR );
1399 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1400 p_sd->p_sys->i_fd, i_fd);
1404 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1407 int i_result, i_dstsize, n = 0;
1408 unsigned char *psz_dst = NULL;
1411 memset (&d_stream, 0, sizeof (d_stream));
1413 i_result = inflateInit(&d_stream);
1414 if( i_result != Z_OK )
1417 d_stream.next_in = (Bytef *)psz_src;
1418 d_stream.avail_in = i_len;
1423 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1424 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1425 d_stream.avail_out = 1000;
1427 i_result = inflate(&d_stream, Z_NO_FLUSH);
1428 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1430 inflateEnd( &d_stream );
1434 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1435 ( i_result != Z_STREAM_END ) );
1437 i_dstsize = d_stream.total_out;
1438 inflateEnd( &d_stream );
1440 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1452 static void FreeSDP( sdp_t *p_sdp )
1454 free( p_sdp->psz_sessionname );
1455 free( p_sdp->psz_uri );
1457 for (unsigned j = 0; j < p_sdp->mediac; j++)
1459 free (p_sdp->mediav[j].fmt);
1460 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1461 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1462 free (p_sdp->mediav[j].pp_attributes);
1464 free (p_sdp->mediav);
1466 for (int i = 0; i < p_sdp->i_attributes; i++)
1467 FreeAttribute (p_sdp->pp_attributes[i]);
1469 free (p_sdp->pp_attributes);
1473 static int RemoveAnnounce( services_discovery_t *p_sd,
1474 sap_announce_t *p_announce )
1478 if( p_announce->p_sdp )
1480 FreeSDP( p_announce->p_sdp );
1481 p_announce->p_sdp = NULL;
1484 if( p_announce->i_input_id > -1 )
1485 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1487 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1489 if( p_sd->p_sys->pp_announces[i] == p_announce )
1491 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1502 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1504 /* A session is identified by
1507 * - network type (which is always IN),
1508 * - address type (currently, this means IP version),
1511 if (strcmp (p_sdp1->username, p_sdp2->username)
1512 || (p_sdp1->session_id != p_sdp2->session_id)
1513 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1514 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1521 static inline attribute_t *MakeAttribute (const char *str)
1523 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1527 strcpy (a->name, str);
1528 EnsureUTF8 (a->name);
1529 char *value = strchr (a->name, ':');
1541 static const char *GetAttribute (attribute_t **tab, unsigned n,
1544 for (unsigned i = 0; i < n; i++)
1545 if (strcasecmp (tab[i]->name, name) == 0)
1546 return tab[i]->value;
1551 static inline void FreeAttribute (attribute_t *a)