git.sesse.net Git - vlc/blob - modules/services_discovery/bonjour.c

   1 /*****************************************************************************
   2  * bonjour.c: Bonjour services discovery module
   3  *****************************************************************************
   4  * Copyright (C) 2005-2008 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_playlist.h>
  35 #include <vlc_arrays.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_module_begin ()
  53     set_shortname( "Bonjour" )
  54     set_description( N_("Bonjour services") )
  55     set_category( CAT_PLAYLIST )
  56     set_subcategory( SUBCAT_PLAYLIST_SD )
  57     set_capability( "services_discovery", 0 )
  58     set_callbacks( Open, Close )
  59 vlc_module_end ()
  60
  61 /*****************************************************************************
  62  * Local structures
  63  *****************************************************************************/
  64
  65 struct services_discovery_sys_t
  66 {
  67     AvahiThreadedPoll   *poll;
  68     AvahiClient         *client;
  69     AvahiServiceBrowser *sb;
  70     vlc_dictionary_t    services_name_to_input_item;
  71 };
  72
  73 /*****************************************************************************
  74  * Local prototypes
  75  *****************************************************************************/
  76
  77 /*****************************************************************************
  78  * client_callback
  79  *****************************************************************************/
  80 static void client_callback( AvahiClient *c, AvahiClientState state,
  81                              void * userdata )
  82 {
  83     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
  84     services_discovery_sys_t *p_sys = p_sd->p_sys;
  85
  86     if( state == AVAHI_CLIENT_FAILURE &&
  87         (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
  88     {
  89         msg_Err( p_sd, "avahi client disconnected" );
  90         avahi_threaded_poll_quit( p_sys->poll );
  91     }
  92 }
  93
  94 /*****************************************************************************
  95  * resolve_callback
  96  *****************************************************************************/
  97 static void resolve_callback(
  98     AvahiServiceResolver *r,
  99     AvahiIfIndex interface,
 100     AvahiProtocol protocol,
 101     AvahiResolverEvent event,
 102     const char *name,
 103     const char *type,
 104     const char *domain,
 105     const char *host_name,
 106     const AvahiAddress *address,
 107     uint16_t port,
 108     AvahiStringList *txt,
 109     AvahiLookupResultFlags flags,
 110     void* userdata )
 111 {
 112     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 113     services_discovery_sys_t *p_sys = p_sd->p_sys;
 114
 115     VLC_UNUSED(interface); VLC_UNUSED(host_name);
 116     VLC_UNUSED(flags);
 117
 118     if( event == AVAHI_RESOLVER_FAILURE )
 119     {
 120         msg_Err( p_sd,
 121                  "failed to resolve service '%s' of type '%s' in domain '%s'",
 122                  name, type, domain );
 123     }
 124     else if( event == AVAHI_RESOLVER_FOUND )
 125     {
 126         char a[128];
 127         char *psz_uri = NULL;
 128         char *psz_addr = NULL;
 129         AvahiStringList *asl = NULL;
 130         input_item_t *p_input = NULL;
 131
 132         msg_Dbg( p_sd, "service '%s' of type '%s' in domain '%s'",
 133                  name, type, domain );
 134
 135         avahi_address_snprint(a, (sizeof(a)/sizeof(a[0]))-1, address);
 136         if( protocol == AVAHI_PROTO_INET6 )
 137             if( asprintf( &psz_addr, "[%s]", a ) == -1 )
 138                 return;
 139
 140         if( txt != NULL )
 141             asl = avahi_string_list_find( txt, "path" );
 142         if( asl != NULL )
 143         {
 144             size_t size;
 145             char *key = NULL;
 146             char *value = NULL;
 147             if( avahi_string_list_get_pair( asl, &key, &value, &size ) == 0 &&
 148                 value != NULL )
 149             {
 150                 if( asprintf( &psz_uri, "http://%s:%d%s",
 151                           psz_addr != NULL ? psz_addr : a, port, value ) == -1 )
 152                 {
 153                     free( psz_addr );
 154                     return;
 155                 }
 156             }
 157             if( key != NULL )
 158                 avahi_free( (void *)key );
 159             if( value != NULL )
 160                 avahi_free( (void *)value );
 161         }
 162         else
 163         {
 164             if( asprintf( &psz_uri, "http://%s:%d",
 165                       psz_addr != NULL ? psz_addr : a, port ) == -1 )
 166             {
 167                 free( psz_addr );
 168                 return;
 169             }
 170         }
 171
 172         if( psz_addr != NULL )
 173             free( (void *)psz_addr );
 174
 175         if( psz_uri != NULL )
 176         {
 177             p_input = input_item_NewExt( p_sd, psz_uri, name, 0, NULL, -1 );
 178             free( (void *)psz_uri );
 179         }
 180         if( p_input != NULL )
 181         {
 182             vlc_dictionary_insert( &p_sys->services_name_to_input_item,
 183                 name, p_input );
 184             services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
 185             vlc_gc_decref( p_input );
 186        }
 187     }
 188
 189     avahi_service_resolver_free( r );
 190 }
 191
 192 /*****************************************************************************
 193  * browser_callback
 194  *****************************************************************************/
 195 static void browse_callback(
 196     AvahiServiceBrowser *b,
 197     AvahiIfIndex interface,
 198     AvahiProtocol protocol,
 199     AvahiBrowserEvent event,
 200     const char *name,
 201     const char *type,
 202     const char *domain,
 203     AvahiLookupResultFlags flags,
 204     void* userdata )
 205 {
 206     VLC_UNUSED(b);
 207     VLC_UNUSED(flags);
 208     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 209     services_discovery_sys_t *p_sys = p_sd->p_sys;
 210     if( event == AVAHI_BROWSER_NEW )
 211     {
 212         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
 213                                         name, type, domain, AVAHI_PROTO_UNSPEC,
 214                                         0,
 215                                         resolve_callback, userdata ) == NULL )
 216         {
 217             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
 218                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 219         }
 220     }
 221     else if( name )
 222     {
 223         /** \todo Store the input id and search it, rather than searching the items */
 224         input_item_t *p_item;
 225         p_item = vlc_dictionary_value_for_key(
 226                         &p_sys->services_name_to_input_item,
 227                         name );
 228         if( !p_item )
 229             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
 230         else
 231         {
 232             services_discovery_RemoveItem( p_sd, p_item );
 233             vlc_dictionary_remove_value_for_key(
 234                         &p_sys->services_name_to_input_item,
 235                         name, NULL, NULL );
 236         }
 237     }
 238 }
 239
 240 /*****************************************************************************
 241  * Open: initialize and create stuff
 242  *****************************************************************************/
 243 static int Open( vlc_object_t *p_this )
 244 {
 245     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 246     services_discovery_sys_t *p_sys;
 247     int err;
 248
 249     p_sd->p_sys = p_sys = (services_discovery_sys_t *)malloc(
 250         sizeof( services_discovery_sys_t ) );
 251
 252     if( !p_sys )
 253         return VLC_ENOMEM;
 254
 255     memset( p_sys, 0, sizeof(*p_sys) );
 256
 257     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 258
 259     p_sys->poll = avahi_threaded_poll_new();
 260     if( p_sys->poll == NULL )
 261     {
 262         msg_Err( p_sd, "failed to create Avahi threaded poll" );
 263         goto error;
 264     }
 265
 266     p_sys->client = avahi_client_new( avahi_threaded_poll_get(p_sys->poll),
 267                                       0, client_callback, p_sd, &err );
 268     if( p_sys->client == NULL )
 269     {
 270         msg_Err( p_sd, "failed to create avahi client: %s",
 271                  avahi_strerror( err ) );
 272         goto error;
 273     }
 274
 275     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 276                                            AVAHI_PROTO_UNSPEC,
 277                                            "_vlc-http._tcp", NULL,
 278                                            0, browse_callback, p_sd );
 279     if( p_sys->sb == NULL )
 280     {
 281         msg_Err( p_sd, "failed to create avahi service browser" );
 282         goto error;
 283     }
 284
 285     services_discovery_SetLocalizedName( p_sd, _("Bonjour") );
 286
 287     return VLC_SUCCESS;
 288
 289 error:
 290     if( p_sys->sb != NULL )
 291         avahi_service_browser_free( p_sys->sb );
 292     if( p_sys->client != NULL )
 293         avahi_client_free( p_sys->client );
 294     if( p_sys->poll != NULL )
 295         avahi_threaded_poll_free( p_sys->poll );
 296
 297     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 298     free( p_sys );
 299
 300     return VLC_EGENERIC;
 301 }
 302
 303 /*****************************************************************************
 304  * Close: cleanup
 305  *****************************************************************************/
 306 static void Close( vlc_object_t *p_this )
 307 {
 308     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 309     services_discovery_sys_t *p_sys = p_sd->p_sys;
 310
 311     avahi_service_browser_free( p_sys->sb );
 312     avahi_client_free( p_sys->client );
 313     avahi_threaded_poll_free( p_sys->poll );
 314
 315     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 316     free( p_sys );
 317 }