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 /* Main functions */
  78 static void Run    ( services_discovery_t *p_intf );
  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         if( psz_addr != NULL )
 176             free( (void *)psz_addr );
 177
 178         if( psz_uri != NULL )
 179         {
 180             p_input = input_item_NewExt( p_sd, psz_uri, name, 0, NULL, -1 );
 181             free( (void *)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 );
 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 = (services_discovery_sys_t *)malloc(
 253         sizeof( services_discovery_sys_t ) );
 254
 255     if( !p_sys )
 256         return VLC_ENOMEM;
 257
 258     memset( p_sys, 0, sizeof(*p_sys) );
 259
 260     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 261
 262     p_sys->poll = avahi_threaded_poll_new();
 263     if( p_sys->poll == NULL )
 264     {
 265         msg_Err( p_sd, "failed to create Avahi threaded poll" );
 266         goto error;
 267     }
 268
 269     p_sys->client = avahi_client_new( avahi_threaded_poll_get(p_sys->poll),
 270                                       0, client_callback, p_sd, &err );
 271     if( p_sys->client == NULL )
 272     {
 273         msg_Err( p_sd, "failed to create avahi client: %s",
 274                  avahi_strerror( err ) );
 275         goto error;
 276     }
 277
 278     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 279                                            AVAHI_PROTO_UNSPEC,
 280                                            "_vlc-http._tcp", NULL,
 281                                            0, browse_callback, p_sd );
 282     if( p_sys->sb == NULL )
 283     {
 284         msg_Err( p_sd, "failed to create avahi service browser" );
 285         goto error;
 286     }
 287
 288     services_discovery_SetLocalizedName( p_sd, _("Bonjour") );
 289
 290     return VLC_SUCCESS;
 291
 292 error:
 293     if( p_sys->sb != NULL )
 294         avahi_service_browser_free( p_sys->sb );
 295     if( p_sys->client != NULL )
 296         avahi_client_free( p_sys->client );
 297     if( p_sys->poll != NULL )
 298         avahi_threaded_poll_free( p_sys->poll );
 299
 300     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
 301     free( p_sys );
 302
 303     return VLC_EGENERIC;
 304 }
 305
 306 /*****************************************************************************
 307  * Close: cleanup
 308  *****************************************************************************/
 309 static void Close( vlc_object_t *p_this )
 310 {
 311     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 312     services_discovery_sys_t *p_sys = p_sd->p_sys;
 313
 314     avahi_service_browser_free( p_sys->sb );
 315     avahi_client_free( p_sys->client );
 316     avahi_threaded_poll_free( p_sys->poll );
 317
 318     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
 319     free( p_sys );
 320 }