git.sesse.net Git - vlc/blob - 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 #define VLC_MODULE_LICENSE VLC_LICENSE_GPL_2_PLUS
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_services_discovery.h>
  36
  37 #include <avahi-client/client.h>
  38 #include <avahi-client/publish.h>
  39 #include <avahi-client/lookup.h>
  40 #include <avahi-common/thread-watch.h>
  41 #include <avahi-common/malloc.h>
  42 #include <avahi-common/error.h>
  43
  44 /*****************************************************************************
  45  * Module descriptor
  46  *****************************************************************************/
  47
  48 /* Callbacks */
  49     static int  Open ( vlc_object_t * );
  50     static void Close( vlc_object_t * );
  51
  52 VLC_SD_PROBE_HELPER("bonjour", "Bonjour services", SD_CAT_LAN)
  53
  54 vlc_module_begin ()
  55     set_shortname( "Bonjour" )
  56     set_description( N_("Bonjour services") )
  57     set_category( CAT_PLAYLIST )
  58     set_subcategory( SUBCAT_PLAYLIST_SD )
  59     set_capability( "services_discovery", 0 )
  60     set_callbacks( Open, Close )
  61
  62     VLC_SD_PROBE_SUBMODULE
  63 vlc_module_end ()
  64
  65 /*****************************************************************************
  66  * Local structures
  67  *****************************************************************************/
  68
  69 struct services_discovery_sys_t
  70 {
  71     AvahiThreadedPoll   *poll;
  72     AvahiClient         *client;
  73     AvahiServiceBrowser *sb;
  74     vlc_dictionary_t    services_name_to_input_item;
  75 };
  76
  77 /*****************************************************************************
  78  * Local prototypes
  79  *****************************************************************************/
  80
  81 /*****************************************************************************
  82  * client_callback
  83  *****************************************************************************/
  84 static void client_callback( AvahiClient *c, AvahiClientState state,
  85                              void * userdata )
  86 {
  87     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
  88     services_discovery_sys_t *p_sys = p_sd->p_sys;
  89
  90     if( state == AVAHI_CLIENT_FAILURE &&
  91         (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
  92     {
  93         msg_Err( p_sd, "avahi client disconnected" );
  94         avahi_threaded_poll_quit( p_sys->poll );
  95     }
  96 }
  97
  98 /*****************************************************************************
  99  * resolve_callback
 100  *****************************************************************************/
 101 static void resolve_callback(
 102     AvahiServiceResolver *r,
 103     AvahiIfIndex interface,
 104     AvahiProtocol protocol,
 105     AvahiResolverEvent event,
 106     const char *name,
 107     const char *type,
 108     const char *domain,
 109     const char *host_name,
 110     const AvahiAddress *address,
 111     uint16_t port,
 112     AvahiStringList *txt,
 113     AvahiLookupResultFlags flags,
 114     void* userdata )
 115 {
 116     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 117     services_discovery_sys_t *p_sys = p_sd->p_sys;
 118
 119     VLC_UNUSED(interface); VLC_UNUSED(host_name);
 120     VLC_UNUSED(flags);
 121
 122     if( event == AVAHI_RESOLVER_FAILURE )
 123     {
 124         msg_Err( p_sd,
 125                  "failed to resolve service '%s' of type '%s' in domain '%s'",
 126                  name, type, domain );
 127     }
 128     else if( event == AVAHI_RESOLVER_FOUND )
 129     {
 130         char a[128];
 131         char *psz_uri = NULL;
 132         char *psz_addr = NULL;
 133         AvahiStringList *asl = NULL;
 134         input_item_t *p_input = NULL;
 135
 136         msg_Dbg( p_sd, "service '%s' of type '%s' in domain '%s'",
 137                  name, type, domain );
 138
 139         avahi_address_snprint(a, (sizeof(a)/sizeof(a[0]))-1, address);
 140         if( protocol == AVAHI_PROTO_INET6 )
 141             if( asprintf( &psz_addr, "[%s]", a ) == -1 )
 142                 return;
 143
 144         if( txt != NULL )
 145             asl = avahi_string_list_find( txt, "path" );
 146         if( asl != NULL )
 147         {
 148             size_t size;
 149             char *key = NULL;
 150             char *value = NULL;
 151             if( avahi_string_list_get_pair( asl, &key, &value, &size ) == 0 &&
 152                 value != NULL )
 153             {
 154                 if( asprintf( &psz_uri, "http://%s:%d%s",
 155                           psz_addr != NULL ? psz_addr : a, port, value ) == -1 )
 156                 {
 157                     free( psz_addr );
 158                     return;
 159                 }
 160             }
 161             if( key != NULL )
 162                 avahi_free( (void *)key );
 163             if( value != NULL )
 164                 avahi_free( (void *)value );
 165         }
 166         else
 167         {
 168             if( asprintf( &psz_uri, "http://%s:%d",
 169                       psz_addr != NULL ? psz_addr : a, port ) == -1 )
 170             {
 171                 free( psz_addr );
 172                 return;
 173             }
 174         }
 175
 176         free( psz_addr );
 177
 178         if( psz_uri != NULL )
 179         {
 180             p_input = input_item_New( psz_uri, name );
 181             free( psz_uri );
 182         }
 183         if( p_input != NULL )
 184         {
 185             vlc_dictionary_insert( &p_sys->services_name_to_input_item,
 186                 name, p_input );
 187             services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
 188             vlc_gc_decref( p_input );
 189        }
 190     }
 191
 192     avahi_service_resolver_free( r );
 193 }
 194
 195 /*****************************************************************************
 196  * browser_callback
 197  *****************************************************************************/
 198 static void browse_callback(
 199     AvahiServiceBrowser *b,
 200     AvahiIfIndex interface,
 201     AvahiProtocol protocol,
 202     AvahiBrowserEvent event,
 203     const char *name,
 204     const char *type,
 205     const char *domain,
 206     AvahiLookupResultFlags flags,
 207     void* userdata )
 208 {
 209     VLC_UNUSED(b);
 210     VLC_UNUSED(flags);
 211     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 212     services_discovery_sys_t *p_sys = p_sd->p_sys;
 213     if( event == AVAHI_BROWSER_NEW )
 214     {
 215         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
 216                                         name, type, domain, AVAHI_PROTO_UNSPEC,
 217                                         0,
 218                                         resolve_callback, userdata ) == NULL )
 219         {
 220             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
 221                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 222         }
 223     }
 224     else if( name )
 225     {
 226         /** \todo Store the input id and search it, rather than searching the items */
 227         input_item_t *p_item;
 228         p_item = vlc_dictionary_value_for_key(
 229                         &p_sys->services_name_to_input_item,
 230                         name );
 231         if( !p_item )
 232             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
 233         else
 234         {
 235             services_discovery_RemoveItem( p_sd, p_item );
 236             vlc_dictionary_remove_value_for_key(
 237                         &p_sys->services_name_to_input_item,
 238                         name, NULL, NULL );
 239         }
 240     }
 241 }
 242
 243 /*****************************************************************************
 244  * Open: initialize and create stuff
 245  *****************************************************************************/
 246 static int Open( vlc_object_t *p_this )
 247 {
 248     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 249     services_discovery_sys_t *p_sys;
 250     int err;
 251
 252     p_sd->p_sys = p_sys = calloc( 1, sizeof( services_discovery_sys_t ) );
 253     if( !p_sys )
 254         return VLC_ENOMEM;
 255
 256     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 257
 258     p_sys->poll = avahi_threaded_poll_new();
 259     if( p_sys->poll == NULL )
 260     {
 261         msg_Err( p_sd, "failed to create Avahi threaded poll" );
 262         goto error;
 263     }
 264
 265     p_sys->client = avahi_client_new( avahi_threaded_poll_get(p_sys->poll),
 266                                       0, client_callback, p_sd, &err );
 267     if( p_sys->client == NULL )
 268     {
 269         msg_Err( p_sd, "failed to create avahi client: %s",
 270                  avahi_strerror( err ) );
 271         goto error;
 272     }
 273
 274     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 275                                            AVAHI_PROTO_UNSPEC,
 276                                            "_vlc-http._tcp", NULL,
 277                                            0, browse_callback, p_sd );
 278     if( p_sys->sb == NULL )
 279     {
 280         msg_Err( p_sd, "failed to create avahi service browser" );
 281         goto error;
 282     }
 283
 284     return VLC_SUCCESS;
 285
 286 error:
 287     if( p_sys->sb != NULL )
 288         avahi_service_browser_free( p_sys->sb );
 289     if( p_sys->client != NULL )
 290         avahi_client_free( p_sys->client );
 291     if( p_sys->poll != NULL )
 292         avahi_threaded_poll_free( p_sys->poll );
 293
 294     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 295     free( p_sys );
 296
 297     return VLC_EGENERIC;
 298 }
 299
 300 /*****************************************************************************
 301  * Close: cleanup
 302  *****************************************************************************/
 303 static void Close( vlc_object_t *p_this )
 304 {
 305     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 306     services_discovery_sys_t *p_sys = p_sd->p_sys;
 307
 308     avahi_service_browser_free( p_sys->sb );
 309     avahi_client_free( p_sys->client );
 310     avahi_threaded_poll_free( p_sys->poll );
 311
 312     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 313     free( p_sys );
 314 }