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 #include <vlc_services_discovery.h>
  37
  38 #include <avahi-client/client.h>
  39 #include <avahi-client/publish.h>
  40 #include <avahi-client/lookup.h>
  41 #include <avahi-common/thread-watch.h>
  42 #include <avahi-common/malloc.h>
  43 #include <avahi-common/error.h>
  44
  45 /*****************************************************************************
  46  * Module descriptor
  47  *****************************************************************************/
  48
  49 /* Callbacks */
  50     static int  Open ( vlc_object_t * );
  51     static void Close( vlc_object_t * );
  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 vlc_module_end ()
  61
  62 /*****************************************************************************
  63  * Local structures
  64  *****************************************************************************/
  65
  66 struct services_discovery_sys_t
  67 {
  68     AvahiThreadedPoll   *poll;
  69     AvahiClient         *client;
  70     AvahiServiceBrowser *sb;
  71     vlc_dictionary_t    services_name_to_input_item;
  72 };
  73
  74 /*****************************************************************************
  75  * Local prototypes
  76  *****************************************************************************/
  77
  78 /*****************************************************************************
  79  * client_callback
  80  *****************************************************************************/
  81 static void client_callback( AvahiClient *c, AvahiClientState state,
  82                              void * userdata )
  83 {
  84     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
  85     services_discovery_sys_t *p_sys = p_sd->p_sys;
  86
  87     if( state == AVAHI_CLIENT_FAILURE &&
  88         (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
  89     {
  90         msg_Err( p_sd, "avahi client disconnected" );
  91         avahi_threaded_poll_quit( p_sys->poll );
  92     }
  93 }
  94
  95 /*****************************************************************************
  96  * resolve_callback
  97  *****************************************************************************/
  98 static void resolve_callback(
  99     AvahiServiceResolver *r,
 100     AvahiIfIndex interface,
 101     AvahiProtocol protocol,
 102     AvahiResolverEvent event,
 103     const char *name,
 104     const char *type,
 105     const char *domain,
 106     const char *host_name,
 107     const AvahiAddress *address,
 108     uint16_t port,
 109     AvahiStringList *txt,
 110     AvahiLookupResultFlags flags,
 111     void* userdata )
 112 {
 113     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 114     services_discovery_sys_t *p_sys = p_sd->p_sys;
 115
 116     VLC_UNUSED(interface); VLC_UNUSED(host_name);
 117     VLC_UNUSED(flags);
 118
 119     if( event == AVAHI_RESOLVER_FAILURE )
 120     {
 121         msg_Err( p_sd,
 122                  "failed to resolve service '%s' of type '%s' in domain '%s'",
 123                  name, type, domain );
 124     }
 125     else if( event == AVAHI_RESOLVER_FOUND )
 126     {
 127         char a[128];
 128         char *psz_uri = NULL;
 129         char *psz_addr = NULL;
 130         AvahiStringList *asl = NULL;
 131         input_item_t *p_input = NULL;
 132
 133         msg_Dbg( p_sd, "service '%s' of type '%s' in domain '%s'",
 134                  name, type, domain );
 135
 136         avahi_address_snprint(a, (sizeof(a)/sizeof(a[0]))-1, address);
 137         if( protocol == AVAHI_PROTO_INET6 )
 138             if( asprintf( &psz_addr, "[%s]", a ) == -1 )
 139                 return;
 140
 141         if( txt != NULL )
 142             asl = avahi_string_list_find( txt, "path" );
 143         if( asl != NULL )
 144         {
 145             size_t size;
 146             char *key = NULL;
 147             char *value = NULL;
 148             if( avahi_string_list_get_pair( asl, &key, &value, &size ) == 0 &&
 149                 value != NULL )
 150             {
 151                 if( asprintf( &psz_uri, "http://%s:%d%s",
 152                           psz_addr != NULL ? psz_addr : a, port, value ) == -1 )
 153                 {
 154                     free( psz_addr );
 155                     return;
 156                 }
 157             }
 158             if( key != NULL )
 159                 avahi_free( (void *)key );
 160             if( value != NULL )
 161                 avahi_free( (void *)value );
 162         }
 163         else
 164         {
 165             if( asprintf( &psz_uri, "http://%s:%d",
 166                       psz_addr != NULL ? psz_addr : a, port ) == -1 )
 167             {
 168                 free( psz_addr );
 169                 return;
 170             }
 171         }
 172
 173         if( psz_addr != NULL )
 174             free( (void *)psz_addr );
 175
 176         if( psz_uri != NULL )
 177         {
 178             p_input = input_item_NewExt( p_sd, psz_uri, name, 0, NULL, -1 );
 179             free( (void *)psz_uri );
 180         }
 181         if( p_input != NULL )
 182         {
 183             vlc_dictionary_insert( &p_sys->services_name_to_input_item,
 184                 name, p_input );
 185             services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
 186             vlc_gc_decref( p_input );
 187        }
 188     }
 189
 190     avahi_service_resolver_free( r );
 191 }
 192
 193 /*****************************************************************************
 194  * browser_callback
 195  *****************************************************************************/
 196 static void browse_callback(
 197     AvahiServiceBrowser *b,
 198     AvahiIfIndex interface,
 199     AvahiProtocol protocol,
 200     AvahiBrowserEvent event,
 201     const char *name,
 202     const char *type,
 203     const char *domain,
 204     AvahiLookupResultFlags flags,
 205     void* userdata )
 206 {
 207     VLC_UNUSED(b);
 208     VLC_UNUSED(flags);
 209     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 210     services_discovery_sys_t *p_sys = p_sd->p_sys;
 211     if( event == AVAHI_BROWSER_NEW )
 212     {
 213         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
 214                                         name, type, domain, AVAHI_PROTO_UNSPEC,
 215                                         0,
 216                                         resolve_callback, userdata ) == NULL )
 217         {
 218             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
 219                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 220         }
 221     }
 222     else if( name )
 223     {
 224         /** \todo Store the input id and search it, rather than searching the items */
 225         input_item_t *p_item;
 226         p_item = vlc_dictionary_value_for_key(
 227                         &p_sys->services_name_to_input_item,
 228                         name );
 229         if( !p_item )
 230             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
 231         else
 232         {
 233             services_discovery_RemoveItem( p_sd, p_item );
 234             vlc_dictionary_remove_value_for_key(
 235                         &p_sys->services_name_to_input_item,
 236                         name, NULL, NULL );
 237         }
 238     }
 239 }
 240
 241 /*****************************************************************************
 242  * Open: initialize and create stuff
 243  *****************************************************************************/
 244 static int Open( vlc_object_t *p_this )
 245 {
 246     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 247     services_discovery_sys_t *p_sys;
 248     int err;
 249
 250     p_sd->p_sys = p_sys = (services_discovery_sys_t *)malloc(
 251         sizeof( services_discovery_sys_t ) );
 252
 253     if( !p_sys )
 254         return VLC_ENOMEM;
 255
 256     memset( p_sys, 0, sizeof(*p_sys) );
 257
 258     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 259
 260     p_sys->poll = avahi_threaded_poll_new();
 261     if( p_sys->poll == NULL )
 262     {
 263         msg_Err( p_sd, "failed to create Avahi threaded poll" );
 264         goto error;
 265     }
 266
 267     p_sys->client = avahi_client_new( avahi_threaded_poll_get(p_sys->poll),
 268                                       0, client_callback, p_sd, &err );
 269     if( p_sys->client == NULL )
 270     {
 271         msg_Err( p_sd, "failed to create avahi client: %s",
 272                  avahi_strerror( err ) );
 273         goto error;
 274     }
 275
 276     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 277                                            AVAHI_PROTO_UNSPEC,
 278                                            "_vlc-http._tcp", NULL,
 279                                            0, browse_callback, p_sd );
 280     if( p_sys->sb == NULL )
 281     {
 282         msg_Err( p_sd, "failed to create avahi service browser" );
 283         goto error;
 284     }
 285
 286     return VLC_SUCCESS;
 287
 288 error:
 289     if( p_sys->sb != NULL )
 290         avahi_service_browser_free( p_sys->sb );
 291     if( p_sys->client != NULL )
 292         avahi_client_free( p_sys->client );
 293     if( p_sys->poll != NULL )
 294         avahi_threaded_poll_free( p_sys->poll );
 295
 296     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 297     free( p_sys );
 298
 299     return VLC_EGENERIC;
 300 }
 301
 302 /*****************************************************************************
 303  * Close: cleanup
 304  *****************************************************************************/
 305 static void Close( vlc_object_t *p_this )
 306 {
 307     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 308     services_discovery_sys_t *p_sys = p_sd->p_sys;
 309
 310     avahi_service_browser_free( p_sys->sb );
 311     avahi_client_free( p_sys->client );
 312     avahi_threaded_poll_free( p_sys->poll );
 313
 314     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 315     free( p_sys );
 316 }