modules/services_discovery/bonjour.c

   1 /*****************************************************************************
   2  * bonjour.c: Bonjour services discovery module
   3  *****************************************************************************
   4  * Copyright (C) 2005-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Jon Lech Johansen <jon@nanocrew.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Includes
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_services_discovery.h>
  35
  36 #include <avahi-client/client.h>
  37 #include <avahi-client/publish.h>
  38 #include <avahi-client/lookup.h>
  39 #include <avahi-common/thread-watch.h>
  40 #include <avahi-common/malloc.h>
  41 #include <avahi-common/error.h>
  42
  43 /*****************************************************************************
  44  * Module descriptor
  45  *****************************************************************************/
  46
  47 /* Callbacks */
  48     static int  Open ( vlc_object_t * );
  49     static void Close( vlc_object_t * );
  50
  51 VLC_SD_PROBE_HELPER("bonjour", "Bonjour services", SD_CAT_LAN)
  52
  53 vlc_module_begin ()
  54     set_shortname( "Bonjour" )
  55     set_description( N_("Bonjour services") )
  56     set_category( CAT_PLAYLIST )
  57     set_subcategory( SUBCAT_PLAYLIST_SD )
  58     set_capability( "services_discovery", 0 )
  59     set_callbacks( Open, Close )
  60
  61     VLC_SD_PROBE_SUBMODULE
  62 vlc_module_end ()
  63
  64 /*****************************************************************************
  65  * Local structures
  66  *****************************************************************************/
  67
  68 struct services_discovery_sys_t
  69 {
  70     AvahiThreadedPoll   *poll;
  71     AvahiClient         *client;
  72     AvahiServiceBrowser *sb;
  73     vlc_dictionary_t    services_name_to_input_item;
  74 };
  75
  76 /*****************************************************************************
  77  * Local prototypes
  78  *****************************************************************************/
  79
  80 /*****************************************************************************
  81  * client_callback
  82  *****************************************************************************/
  83 static void client_callback( AvahiClient *c, AvahiClientState state,
  84                              void * userdata )
  85 {
  86     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
  87     services_discovery_sys_t *p_sys = p_sd->p_sys;
  88
  89     if( state == AVAHI_CLIENT_FAILURE &&
  90         (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
  91     {
  92         msg_Err( p_sd, "avahi client disconnected" );
  93         avahi_threaded_poll_quit( p_sys->poll );
  94     }
  95 }
  96
  97 /*****************************************************************************
  98  * resolve_callback
  99  *****************************************************************************/
 100 static void resolve_callback(
 101     AvahiServiceResolver *r,
 102     AvahiIfIndex interface,
 103     AvahiProtocol protocol,
 104     AvahiResolverEvent event,
 105     const char *name,
 106     const char *type,
 107     const char *domain,
 108     const char *host_name,
 109     const AvahiAddress *address,
 110     uint16_t port,
 111     AvahiStringList *txt,
 112     AvahiLookupResultFlags flags,
 113     void* userdata )
 114 {
 115     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 116     services_discovery_sys_t *p_sys = p_sd->p_sys;
 117
 118     VLC_UNUSED(interface); VLC_UNUSED(host_name);
 119     VLC_UNUSED(flags);
 120
 121     if( event == AVAHI_RESOLVER_FAILURE )
 122     {
 123         msg_Err( p_sd,
 124                  "failed to resolve service '%s' of type '%s' in domain '%s'",
 125                  name, type, domain );
 126     }
 127     else if( event == AVAHI_RESOLVER_FOUND )
 128     {
 129         char a[128];
 130         char *psz_uri = NULL;
 131         char *psz_addr = NULL;
 132         AvahiStringList *asl = NULL;
 133         input_item_t *p_input = NULL;
 134
 135         msg_Dbg( p_sd, "service '%s' of type '%s' in domain '%s'",
 136                  name, type, domain );
 137
 138         avahi_address_snprint(a, (sizeof(a)/sizeof(a[0]))-1, address);
 139         if( protocol == AVAHI_PROTO_INET6 )
 140             if( asprintf( &psz_addr, "[%s]", a ) == -1 )
 141                 return;
 142
 143         if( txt != NULL )
 144             asl = avahi_string_list_find( txt, "path" );
 145         if( asl != NULL )
 146         {
 147             size_t size;
 148             char *key = NULL;
 149             char *value = NULL;
 150             if( avahi_string_list_get_pair( asl, &key, &value, &size ) == 0 &&
 151                 value != NULL )
 152             {
 153                 if( asprintf( &psz_uri, "http://%s:%d%s",
 154                           psz_addr != NULL ? psz_addr : a, port, value ) == -1 )
 155                 {
 156                     free( psz_addr );
 157                     return;
 158                 }
 159             }
 160             if( key != NULL )
 161                 avahi_free( (void *)key );
 162             if( value != NULL )
 163                 avahi_free( (void *)value );
 164         }
 165         else
 166         {
 167             if( asprintf( &psz_uri, "http://%s:%d",
 168                       psz_addr != NULL ? psz_addr : a, port ) == -1 )
 169             {
 170                 free( psz_addr );
 171                 return;
 172             }
 173         }
 174
 175         free( psz_addr );
 176
 177         if( psz_uri != NULL )
 178         {
 179             p_input = input_item_New( p_sd, psz_uri, name );
 180             free( psz_uri );
 181         }
 182         if( p_input != NULL )
 183         {
 184             vlc_dictionary_insert( &p_sys->services_name_to_input_item,
 185                 name, p_input );
 186             services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
 187             vlc_gc_decref( p_input );
 188        }
 189     }
 190
 191     avahi_service_resolver_free( r );
 192 }
 193
 194 /*****************************************************************************
 195  * browser_callback
 196  *****************************************************************************/
 197 static void browse_callback(
 198     AvahiServiceBrowser *b,
 199     AvahiIfIndex interface,
 200     AvahiProtocol protocol,
 201     AvahiBrowserEvent event,
 202     const char *name,
 203     const char *type,
 204     const char *domain,
 205     AvahiLookupResultFlags flags,
 206     void* userdata )
 207 {
 208     VLC_UNUSED(b);
 209     VLC_UNUSED(flags);
 210     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 211     services_discovery_sys_t *p_sys = p_sd->p_sys;
 212     if( event == AVAHI_BROWSER_NEW )
 213     {
 214         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
 215                                         name, type, domain, AVAHI_PROTO_UNSPEC,
 216                                         0,
 217                                         resolve_callback, userdata ) == NULL )
 218         {
 219             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
 220                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 221         }
 222     }
 223     else if( name )
 224     {
 225         /** \todo Store the input id and search it, rather than searching the items */
 226         input_item_t *p_item;
 227         p_item = vlc_dictionary_value_for_key(
 228                         &p_sys->services_name_to_input_item,
 229                         name );
 230         if( !p_item )
 231             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
 232         else
 233         {
 234             services_discovery_RemoveItem( p_sd, p_item );
 235             vlc_dictionary_remove_value_for_key(
 236                         &p_sys->services_name_to_input_item,
 237                         name, NULL, NULL );
 238         }
 239     }
 240 }
 241
 242 /*****************************************************************************
 243  * Open: initialize and create stuff
 244  *****************************************************************************/
 245 static int Open( vlc_object_t *p_this )
 246 {
 247     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 248     services_discovery_sys_t *p_sys;
 249     int err;
 250
 251     p_sd->p_sys = p_sys = calloc( 1, sizeof( services_discovery_sys_t ) );
 252     if( !p_sys )
 253         return VLC_ENOMEM;
 254
 255     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 256
 257     p_sys->poll = avahi_threaded_poll_new();
 258     if( p_sys->poll == NULL )
 259     {
 260         msg_Err( p_sd, "failed to create Avahi threaded poll" );
 261         goto error;
 262     }
 263
 264     p_sys->client = avahi_client_new( avahi_threaded_poll_get(p_sys->poll),
 265                                       0, client_callback, p_sd, &err );
 266     if( p_sys->client == NULL )
 267     {
 268         msg_Err( p_sd, "failed to create avahi client: %s",
 269                  avahi_strerror( err ) );
 270         goto error;
 271     }
 272
 273     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 274                                            AVAHI_PROTO_UNSPEC,
 275                                            "_vlc-http._tcp", NULL,
 276                                            0, browse_callback, p_sd );
 277     if( p_sys->sb == NULL )
 278     {
 279         msg_Err( p_sd, "failed to create avahi service browser" );
 280         goto error;
 281     }
 282
 283     return VLC_SUCCESS;
 284
 285 error:
 286     if( p_sys->sb != NULL )
 287         avahi_service_browser_free( p_sys->sb );
 288     if( p_sys->client != NULL )
 289         avahi_client_free( p_sys->client );
 290     if( p_sys->poll != NULL )
 291         avahi_threaded_poll_free( p_sys->poll );
 292
 293     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 294     free( p_sys );
 295
 296     return VLC_EGENERIC;
 297 }
 298
 299 /*****************************************************************************
 300  * Close: cleanup
 301  *****************************************************************************/
 302 static void Close( vlc_object_t *p_this )
 303 {
 304     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 305     services_discovery_sys_t *p_sys = p_sd->p_sys;
 306
 307     avahi_service_browser_free( p_sys->sb );
 308     avahi_client_free( p_sys->client );
 309     avahi_threaded_poll_free( p_sys->poll );
 310
 311     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 312     free( p_sys );
 313 }