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>
53 /************************************************************************
54 * Macros and definitions
55 ************************************************************************/
57 #define MAX_LINE_LENGTH 256
59 /* SAP is always on that port */
61 /* Global-scope SAP address */
62 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
63 /* Organization-local SAP address */
64 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
65 /* Local (smallest non-link-local scope) SAP address */
66 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
67 /* Link-local SAP address */
68 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
71 #define SAP_V6_1 "FF0"
72 /* Scope is inserted between them */
73 #define SAP_V6_2 "::2:7FFE"
74 /* See RFC3513 for list of valid scopes */
75 /* FIXME: find a way to listen to link-local scope */
76 static const char ipv6_scopes[] = "1456789ABCDE";
79 /*****************************************************************************
81 *****************************************************************************/
82 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
83 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
84 "right addresses to listen to. However, you " \
85 "can specify a specific address." )
86 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
87 #define SAP_IPV4_LONGTEXT N_( \
88 "Listen to IPv4 announcements " \
89 "on the standard address." )
90 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
91 #define SAP_IPV6_LONGTEXT N_( \
92 "Listen to IPv6 announcements " \
93 "on the standard addresses." )
94 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
95 #define SAP_SCOPE_LONGTEXT N_( \
96 "Scope for IPv6 announcements (default is 8)." )
97 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
98 #define SAP_TIMEOUT_LONGTEXT N_( \
99 "Delay after which SAP items get deleted if no new announcement " \
101 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
102 #define SAP_PARSE_LONGTEXT N_( \
103 "This enables actual parsing of the announces by the SAP module. " \
104 "Otherwise, all announcements are parsed by the \"livedotcom\" " \
105 "(RTP/RTSP) module." )
106 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
107 #define SAP_STRICT_LONGTEXT N_( \
108 "When this is set, the SAP parser will discard some non-compliant " \
110 #define SAP_CACHE_TEXT N_("Use SAP cache")
111 #define SAP_CACHE_LONGTEXT N_( \
112 "This enables a SAP caching mechanism. " \
113 "This will result in lower SAP startup time, but you could end up " \
114 "with items corresponding to legacy streams." )
115 #define SAP_TIMESHIFT_TEXT N_("Allow timeshifting")
116 #define SAP_TIMESHIFT_LONGTEXT N_( "This automatically enables timeshifting " \
117 "for streams discovered through SAP announcements." )
120 static int Open ( vlc_object_t * );
121 static void Close( vlc_object_t * );
122 static int OpenDemux ( vlc_object_t * );
123 static void CloseDemux ( vlc_object_t * );
126 set_shortname( _("SAP"));
127 set_description( _("SAP Announcements") );
128 set_category( CAT_PLAYLIST );
129 set_subcategory( SUBCAT_PLAYLIST_SD );
131 add_string( "sap-addr", NULL, NULL,
132 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, VLC_TRUE );
133 add_bool( "sap-ipv4", 1 , NULL,
134 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, VLC_TRUE );
135 add_bool( "sap-ipv6", 1 , NULL,
136 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, VLC_TRUE );
137 add_integer( "sap-timeout", 1800, NULL,
138 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, VLC_TRUE );
139 add_bool( "sap-parse", 1 , NULL,
140 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, VLC_TRUE );
141 add_bool( "sap-strict", 0 , NULL,
142 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, VLC_TRUE );
144 add_bool( "sap-cache", 0 , NULL,
145 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, VLC_TRUE );
147 add_bool( "sap-timeshift", 0 , NULL,
148 SAP_TIMESHIFT_TEXT,SAP_TIMESHIFT_LONGTEXT, VLC_TRUE );
150 set_capability( "services_discovery", 0 );
151 set_callbacks( Open, Close );
154 set_description( _("SDP file parser for UDP") );
155 add_shortcut( "sdp" );
156 set_capability( "demux2", 51 );
157 set_callbacks( OpenDemux, CloseDemux );
161 /*****************************************************************************
163 *****************************************************************************/
165 typedef struct sdp_t sdp_t;
166 typedef struct attribute_t attribute_t;
167 typedef struct sap_announce_t sap_announce_t;
172 struct sdp_t *parent;
174 struct sockaddr_storage addr;
178 attribute_t **pp_attributes;
182 /* The structure that contains sdp information */
190 uint64_t session_version;
191 unsigned orig_ip_version;
192 char orig_host[1024];
195 char *psz_sessionname;
202 /* a= global attributes */
204 attribute_t **pp_attributes;
206 /* medias (well, we only support one atm) */
208 struct sdp_media_t *mediav;
217 struct sap_announce_t
222 uint32_t i_source[4];
224 /* SAP annnounces must only contain one SDP */
232 struct services_discovery_sys_t
234 /* Socket descriptors */
239 playlist_item_t *p_node_cat;
240 playlist_item_t *p_node_one;
242 /* Table of announces */
244 struct sap_announce_t **pp_announces;
249 vlc_bool_t b_timeshift;
259 /*****************************************************************************
261 *****************************************************************************/
265 static int Demux( demux_t *p_demux );
266 static int Control( demux_t *, int, va_list );
267 static void Run ( services_discovery_t *p_sd );
269 /* Main parsing functions */
270 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
271 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
272 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
273 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
274 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
276 /* Helper functions */
277 static inline attribute_t *MakeAttribute (const char *str);
278 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
279 static inline void FreeAttribute (attribute_t *a);
280 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
283 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
284 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
285 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
286 static void FreeSDP( sdp_t *p_sdp );
288 /*****************************************************************************
289 * Open: initialize and create stuff
290 *****************************************************************************/
291 static int Open( vlc_object_t *p_this )
293 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
294 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
295 malloc( sizeof( services_discovery_sys_t ) );
297 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
305 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
306 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
309 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
315 /* Cache sap_timeshift value */
316 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" )
317 ? VLC_TRUE : VLC_FALSE;
319 /* Create our playlist node */
322 playlist_NodesPairCreate( pl_Get( p_sd ), _("SAP sessions"),
323 &p_sys->p_node_cat, &p_sys->p_node_one,
325 p_sys->p_node_cat->p_input->b_prefers_tree = VLC_TRUE;
326 p_sys->i_announces = 0;
327 p_sys->pp_announces = NULL;
332 /*****************************************************************************
333 * OpenDemux: initialize and create stuff
334 *****************************************************************************/
335 static int OpenDemux( vlc_object_t *p_this )
337 demux_t *p_demux = (demux_t *)p_this;
339 int i_max_sdp = 1024;
341 char *psz_sdp = NULL;
344 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
346 /* We want livedotcom module to parse this SDP file */
353 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 ) return VLC_EGENERIC;
355 if( strncmp( (char*)p_peek, "v=0\r\n", 5 ) &&
356 strncmp( (char*)p_peek, "v=0\n", 4 ) &&
357 ( p_peek[0] < 'a' || p_peek[0] > 'z' || p_peek[1] != '=' ) )
363 psz_sdp = (char *)malloc( i_max_sdp );
364 if( !psz_sdp ) return VLC_EGENERIC;
366 /* Gather the complete sdp file */
369 int i_read = stream_Read( p_demux->s,
370 &psz_sdp[i_sdp], i_max_sdp - i_sdp - 1 );
374 msg_Err( p_demux, "failed to read SDP" );
380 if( i_read < i_max_sdp - i_sdp - 1 )
382 psz_sdp[i_sdp] = '\0';
387 psz_sdp = (char *)realloc( psz_sdp, i_max_sdp );
390 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
394 msg_Warn( p_demux, "invalid SDP");
398 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
400 p_sdp->psz_uri = NULL;
402 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
403 p_sdp->i_media_type != 14 )
406 if( p_sdp->psz_uri == NULL ) goto error;
408 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
409 p_demux->p_sys->p_sdp = p_sdp;
410 p_demux->pf_control = Control;
411 p_demux->pf_demux = Demux;
418 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
419 stream_Seek( p_demux->s, 0 );
423 /*****************************************************************************
425 *****************************************************************************/
426 static void Close( vlc_object_t *p_this )
428 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
429 services_discovery_sys_t *p_sys = p_sd->p_sys;
433 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
435 net_Close( p_sys->pi_fd[i] );
437 FREENULL( p_sys->pi_fd );
440 if( config_GetInt( p_sd, "sap-cache" ) )
446 for( i = p_sys->i_announces - 1; i>= 0; i-- )
448 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
450 FREENULL( p_sys->pp_announces );
452 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_cat, VLC_TRUE,
454 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_one, VLC_TRUE,
460 /*****************************************************************************
461 * CloseDemux: Close the demuxer
462 *****************************************************************************/
463 static void CloseDemux( vlc_object_t *p_this )
465 demux_t *p_demux = (demux_t *)p_this;
468 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
469 free( p_demux->p_sys );
473 /*****************************************************************************
474 * Run: main SAP thread
475 *****************************************************************************
476 * Listens to SAP packets, and sends them to packet_handle
477 *****************************************************************************/
478 #define MAX_SAP_BUFFER 5000
480 static void Run( services_discovery_t *p_sd )
485 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
486 * DNS queries, even if the DNS server returns an error with milliseconds.
487 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
488 * Winsock 1.1 from Windows 95, if not Windows 3.1.
489 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
490 * we have to open sockets in Run() rather than Open(). */
491 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
493 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
494 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
495 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
496 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
498 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
500 char psz_address[] = SAP_V6_1"0"SAP_V6_2;
503 for( c_scope = ipv6_scopes; *c_scope; c_scope++ )
505 psz_address[sizeof(SAP_V6_1) - 1] = *c_scope;
506 InitSocket( p_sd, psz_address, SAP_PORT );
510 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
511 if( psz_addr && *psz_addr )
513 InitSocket( p_sd, psz_addr, SAP_PORT );
517 if( p_sd->p_sys->i_fd == 0 )
519 msg_Err( p_sd, "unable to listen on any address" );
523 /* read SAP packets */
524 while( !p_sd->b_die )
527 uint8_t p_buffer[MAX_SAP_BUFFER+1];
529 i_read = net_Select( p_sd, p_sd->p_sys->pi_fd,
530 p_sd->p_sys->i_fd, p_buffer,
533 /* Check for items that need deletion */
534 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
536 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
538 if( mdate() - p_sd->p_sys->pp_announces[i]->i_last > i_timeout )
540 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i] );
544 /* Minimum length is > 6 */
549 msg_Warn( p_sd, "socket read error" );
554 p_buffer[i_read] = '\0';
556 /* Parse the packet */
557 ParseSAP( p_sd, p_buffer, i_read );
561 /**********************************************************************
562 * Demux: reads and demuxes data packets
563 * Return -1 if error, 0 if EOF, 1 else
564 **********************************************************************/
565 static int Demux( demux_t *p_demux )
567 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
568 input_thread_t *p_input;
569 input_item_t *p_parent_input;
571 playlist_t *p_playlist = pl_Yield( p_demux );
572 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
577 msg_Err( p_demux, "parent input could not be found" );
581 p_parent_input = input_GetItem(p_input);
583 vlc_mutex_lock( &p_parent_input->lock );
584 FREENULL( p_parent_input->psz_uri );
585 p_parent_input->psz_uri = strdup( p_sdp->psz_uri );
586 FREENULL( p_parent_input->psz_name );
587 p_parent_input->psz_name = strdup( p_sdp->psz_sessionname );
588 p_parent_input->i_type = ITEM_TYPE_NET;
590 if( p_playlist->status.p_item &&
591 p_playlist->status.p_item->p_input == p_parent_input )
593 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
594 p_playlist->status.p_node, p_playlist->status.p_item );
597 vlc_mutex_unlock( &p_parent_input->lock );
598 vlc_object_release( p_input );
599 vlc_object_release( p_playlist );
604 static int Control( demux_t *p_demux, int i_query, va_list args )
609 /**************************************************************
611 **************************************************************/
613 /* i_read is at least > 6 */
614 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
619 const uint8_t *end = buf + len;
622 assert (buf[len] == '\0');
627 uint8_t flags = buf[0];
629 /* First, check the sap announce is correct */
630 if ((flags >> 5) != 1)
633 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
634 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
638 msg_Dbg( p_sd, "encrypted packet, unsupported" );
642 vlc_bool_t b_compressed = (flags & 0x01) != 0;
644 uint16_t i_hash = U16_AT (buf + 2);
646 if( p_sd->p_sys->b_strict && i_hash == 0 )
648 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
652 // Skips source address and auth data
653 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
657 uint8_t *decomp = NULL;
660 int newsize = Decompress (buf, &decomp, end - buf);
663 msg_Dbg( p_sd, "decompression of SAP packet failed" );
667 decomp = realloc (decomp, newsize + 1);
668 decomp[newsize] = '\0';
669 psz_sdp = (const char *)decomp;
674 psz_sdp = (const char *)buf;
678 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
679 assert( psz_sdp[len] == '\0');
681 /* Skip payload type */
682 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
683 if (strncmp (psz_sdp, "v=0", 3))
685 size_t clen = strlen (psz_sdp) + 1;
687 if (strcmp (psz_sdp, "application/sdp"))
689 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
693 // skips content type
702 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
707 p_sdp->psz_sdp = psz_sdp;
709 /* Decide whether we should add a playlist item for this SDP */
710 /* Parse connection information (c= & m= ) */
711 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
712 p_sdp->psz_uri = NULL;
714 /* Multi-media or no-parse -> pass to LIVE.COM */
715 if( ( p_sdp->i_media_type != 14
716 && p_sdp->i_media_type != 32
717 && p_sdp->i_media_type != 33)
718 || p_sd->p_sys->b_parse == VLC_FALSE )
720 free( p_sdp->psz_uri );
721 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
722 p_sdp->psz_uri = NULL;
725 if( p_sdp->psz_uri == NULL ) return VLC_EGENERIC;
727 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
730 /* FIXME: we create a new announce each time the sdp changes */
731 if( IsSameSession( p_sd->p_sys->pp_announces[i]->p_sdp, p_sdp ) )
735 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
739 p_sd->p_sys->pp_announces[i]->i_last = mdate();
741 FreeSDP( p_sdp ); p_sdp = NULL;
746 CreateAnnounce( p_sd, i_hash, p_sdp );
752 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
755 input_item_t *p_input;
756 playlist_item_t *p_item, *p_child;
757 const char *psz_value;
758 sap_announce_t *p_sap = (sap_announce_t *)malloc(
759 sizeof(sap_announce_t ) );
760 services_discovery_sys_t *p_sys;
766 p_sap->i_last = mdate();
767 p_sap->i_hash = i_hash;
768 p_sap->p_sdp = p_sdp;
770 /* Create the actual playlist item here */
771 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
772 p_sap->p_sdp->psz_uri,
773 p_sdp->psz_sessionname,
774 0, NULL, -1, ITEM_TYPE_NET );
775 p_sap->i_input_id = p_input->i_id;
782 if( p_sys->b_timeshift )
783 input_ItemAddOption( p_input, ":access-filter=timeshift" );
785 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
786 if( psz_value != NULL )
788 input_ItemAddInfo( p_input, _("Session"),_("Tool"), psz_value );
790 if( strcmp( p_sdp->username, "-" ) )
792 input_ItemAddInfo( p_input, _("Session"),
793 _("User"), p_sdp->username );
797 if (p_sap->p_sdp->mediac >= 1)
798 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
800 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
802 if( psz_value != NULL )
804 p_child = playlist_ChildSearchName( p_sys->p_node_cat, psz_value );
806 if( p_child == NULL )
808 p_child = playlist_NodeCreate( pl_Get( p_sd ), psz_value,
809 p_sys->p_node_cat, 0 );
810 p_child->i_flags &= ~PLAYLIST_SKIP_FLAG;
815 p_child = p_sys->p_node_cat;
818 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input, p_child,
819 PLAYLIST_APPEND, PLAYLIST_END, VLC_FALSE );
820 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
821 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
822 p_sap->i_item_id_cat = p_item->i_id;
824 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input,
825 p_sys->p_node_one, PLAYLIST_APPEND, PLAYLIST_END,
827 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
828 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
829 p_sap->i_item_id_one = p_item->i_id;
831 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
837 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
840 /* Look for media attribute, and fallback to session */
841 return GetAttribute (sdp->mediav[media].pp_attributes,
842 sdp->mediav[media].i_attributes, name)
843 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
847 /* Fill p_sdp->psz_uri */
848 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
850 if (p_sdp->mediac == 0)
852 msg_Dbg (p_obj, "Ignoring SDP with no media");
856 for (unsigned i = 1; i < p_sdp->mediac; i++)
858 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
859 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
860 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
861 p_sdp->mediav->addrlen))
863 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
868 if (p_sdp->mediav->n_addr != 1)
870 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
879 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
880 p_sdp->mediav->addrlen, psz_uri + 1,
881 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
884 if (strchr (psz_uri + 1, ':'))
887 psz_uri[strlen (psz_uri)] = ']';
893 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
894 if (sdp_proto == NULL)
897 char *subtype = strchr (sdp_proto, ' ');
900 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
901 p_sdp->i_media_type = 0;
906 p_sdp->i_media_type = atoi (subtype);
908 if (p_sdp->i_media_type == 0)
909 p_sdp->i_media_type = 33;
911 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
912 * 0x1: Connection-Oriented media. */
913 static const char proto_match[] =
915 "RTP/AVP\0" "rtp\0\0"
916 "UDPLite/RTP/AVP\0" "udplite\0\0"
917 "DCCP/RTP/AVP\0" "dccp\0\1"
918 "TCP/RTP/AVP\0" "rtptcp\0\1"
921 const char *vlc_proto = NULL;
923 for (const char *proto = proto_match; *proto;)
925 if (strcasecmp (proto, sdp_proto) == 0)
927 vlc_proto = proto + strlen (proto) + 1;
928 flags = vlc_proto[strlen (vlc_proto) + 1];
931 proto += strlen (proto) + 1;
932 proto += strlen (proto) + 2;
936 if (vlc_proto == NULL)
938 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
939 p_sdp->mediav[0].fmt);
945 /* Connection-oriented media */
946 const char *setup = FindAttribute (p_sdp, 0, "setup");
948 setup = "active"; /* default value */
950 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
952 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
956 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
962 /* Non-connected (normally multicast) media */
964 char psz_source[258] = "";
965 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
968 char psz_source_ip[256];
971 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
974 /* According to RFC4570, FQDNs can be used for source-filters,
975 * but -seriously- this is impractical */
981 struct in6_addr addr;
982 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
983 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
984 sizeof (psz_source) - 2) != NULL))
987 psz_source[strlen (psz_source)] = ']';
995 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
996 && (inet_ntop (AF_INET, &addr, psz_source,
997 sizeof (psz_source)) == NULL))
1005 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1014 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1015 socklen_t *addrlen, unsigned *number)
1018 unsigned fam, n1, n2;
1020 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1028 addr->ss_family = AF_INET6;
1032 *addrlen = sizeof (struct sockaddr_in6);
1034 if (inet_pton (AF_INET6, host,
1035 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1038 *number = (res >= 3) ? n1 : 1;
1043 addr->ss_family = AF_INET;
1047 *addrlen = sizeof (struct sockaddr_in);
1049 if (inet_pton (AF_INET, host,
1050 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1053 *number = (res >= 4) ? n2 : 1;
1063 /***********************************************************************
1064 * ParseSDP : SDP parsing
1065 * *********************************************************************
1066 * Validate SDP and parse all fields
1067 ***********************************************************************/
1068 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1070 if( psz_sdp == NULL )
1073 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1078 struct sockaddr_storage glob_addr;
1079 memset (&glob_addr, 0, sizeof (glob_addr));
1080 socklen_t glob_len = 0;
1081 unsigned glob_count = 1;
1084 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1087 /* Extract one line */
1088 char *eol = strchr (psz_sdp, '\n');
1089 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1090 char line[linelen + 1];
1091 memcpy (line, psz_sdp, linelen);
1092 line[linelen] = '\0';
1094 psz_sdp += linelen + 1;
1096 /* Remove carriage return if present */
1097 eol = strchr (line, '\r');
1100 linelen = eol - line;
1101 line[linelen] = '\0';
1105 char cat = line[0], *data = line + 2;
1106 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1108 /* MUST ignore SDP with unknown line type */
1109 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1114 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1118 assert (linelen >= 2);
1120 /* SDP parsing state machine
1121 * We INTERNALLY use uppercase for session, lowercase for media
1125 /* Session description */
1130 msg_Dbg (p_obj, "missing SDP version");
1133 if (strcmp (data, "0"))
1135 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1145 msg_Dbg (p_obj, "missing SDP originator");
1149 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1150 p_sdp->username, &p_sdp->session_id,
1151 &p_sdp->session_version, &p_sdp->orig_ip_version,
1152 p_sdp->orig_host) != 5)
1153 || ((p_sdp->orig_ip_version != 4)
1154 && (p_sdp->orig_ip_version != 6)))
1156 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1157 /* Or maybe out-of-range, but this looks suspicious */
1160 EnsureUTF8 (p_sdp->orig_host);
1167 if ((cat != 's') || !*data)
1169 /* MUST be present AND non-empty */
1170 msg_Dbg (p_obj, "missing SDP session name");
1173 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1174 p_sdp->psz_sessionname = strdup (data);
1175 EnsureUTF8 (p_sdp->psz_sessionname);
1176 if (p_sdp->psz_sessionname == NULL)
1201 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1204 msg_Dbg (p_obj, "SDP connection infos not supported: "
1211 assert (expect == 'B');
1218 msg_Dbg (p_obj, "missing SDP time description");
1224 if ((cat == 't') || (cat == 'r'))
1239 attribute_t *p_attr = MakeAttribute (data);
1240 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1244 /* Media description */
1251 msg_Dbg (p_obj, "missing SDP media description");
1254 struct sdp_media_t *m;
1255 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1263 memset (m, 0, sizeof (*m));
1264 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1265 m->n_addr = glob_count;
1267 /* TODO: remember media type (if we need multiple medias) */
1268 data = strchr (data, ' ');
1271 msg_Dbg (p_obj, "missing SDP media port");
1274 port = atoi (++data);
1275 if (port <= 0 || port >= 65536)
1277 msg_Dbg (p_obj, "invalid transport port %d", port);
1280 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1282 data = strchr (data, ' ');
1285 msg_Dbg (p_obj, "missing SDP media format");
1288 m->fmt = strdup (++data);
1302 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1303 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1306 msg_Dbg (p_obj, "SDP connection infos not supported: "
1310 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1322 assert (expect == 'a');
1325 attribute_t *p_attr = MakeAttribute (data);
1329 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1330 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1339 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1345 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1357 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1360 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1362 return VLC_EGENERIC;
1364 net_StopSend( i_fd );
1365 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1366 p_sd->p_sys->i_fd, i_fd);
1370 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1373 int i_result, i_dstsize, n = 0;
1374 unsigned char *psz_dst = NULL;
1377 memset (&d_stream, 0, sizeof (d_stream));
1379 i_result = inflateInit(&d_stream);
1380 if( i_result != Z_OK )
1383 d_stream.next_in = (Bytef *)psz_src;
1384 d_stream.avail_in = i_len;
1389 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1390 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1391 d_stream.avail_out = 1000;
1393 i_result = inflate(&d_stream, Z_NO_FLUSH);
1394 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1396 inflateEnd( &d_stream );
1400 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1401 ( i_result != Z_STREAM_END ) );
1403 i_dstsize = d_stream.total_out;
1404 inflateEnd( &d_stream );
1406 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1418 static void FreeSDP( sdp_t *p_sdp )
1420 free( p_sdp->psz_sessionname );
1421 free( p_sdp->psz_uri );
1423 for (unsigned j = 0; j < p_sdp->mediac; j++)
1425 free (p_sdp->mediav[j].fmt);
1426 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1427 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1428 free (p_sdp->mediav[j].pp_attributes);
1430 free (p_sdp->mediav);
1432 for (int i = 0; i < p_sdp->i_attributes; i++)
1433 FreeAttribute (p_sdp->pp_attributes[i]);
1435 free (p_sdp->pp_attributes);
1439 static int RemoveAnnounce( services_discovery_t *p_sd,
1440 sap_announce_t *p_announce )
1444 if( p_announce->p_sdp )
1446 FreeSDP( p_announce->p_sdp );
1447 p_announce->p_sdp = NULL;
1450 if( p_announce->i_input_id > -1 )
1451 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1453 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1455 if( p_sd->p_sys->pp_announces[i] == p_announce )
1457 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1468 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1470 /* A session is identified by
1473 * - network type (which is always IN),
1474 * - address type (currently, this means IP version),
1477 if (strcmp (p_sdp1->username, p_sdp2->username)
1478 || (p_sdp1->session_id != p_sdp2->session_id)
1479 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1480 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1487 static inline attribute_t *MakeAttribute (const char *str)
1489 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1493 strcpy (a->name, str);
1494 EnsureUTF8 (a->name);
1495 char *value = strchr (a->name, ':');
1507 static const char *GetAttribute (attribute_t **tab, unsigned n,
1510 for (unsigned i = 0; i < n; i++)
1511 if (strcasecmp (tab[i]->name, name) == 0)
1512 return tab[i]->value;
1517 static inline void FreeAttribute (attribute_t *a)