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

   1 /*****************************************************************************
   2  * bonjour.c: Bonjour services discovery module
   3  *****************************************************************************
   4  * Copyright (C) 2005 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 #include <vlc/vlc.h>
  29 #include <vlc_playlist.h>
  30 #include <vlc_arrays.h>
  31
  32 #include <avahi-client/client.h>
  33 #ifdef HAVE_AVAHI_06
  34 # include <avahi-client/publish.h>
  35 # include <avahi-client/lookup.h>
  36 #endif
  37 #include <avahi-common/simple-watch.h>
  38 #include <avahi-common/malloc.h>
  39 #include <avahi-common/error.h>
  40
  41 /*****************************************************************************
  42  * Module descriptor
  43  *****************************************************************************/
  44
  45 /* Callbacks */
  46     static int  Open ( vlc_object_t * );
  47     static void Close( vlc_object_t * );
  48
  49 vlc_module_begin();
  50     set_shortname( "Bonjour" );
  51     set_description( _("Bonjour services") );
  52     set_category( CAT_PLAYLIST );
  53     set_subcategory( SUBCAT_PLAYLIST_SD );
  54     set_capability( "services_discovery", 0 );
  55     set_callbacks( Open, Close );
  56 vlc_module_end();
  57
  58 /*****************************************************************************
  59  * Local structures
  60  *****************************************************************************/
  61
  62 struct services_discovery_sys_t
  63 {
  64     AvahiSimplePoll     *simple_poll;
  65     AvahiClient         *client;
  66     AvahiServiceBrowser *sb;
  67     vlc_dictionary_t    services_name_to_input_item;
  68 };
  69
  70 /*****************************************************************************
  71  * Local prototypes
  72  *****************************************************************************/
  73
  74 /* Main functions */
  75     static void Run    ( services_discovery_t *p_intf );
  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 #ifdef HAVE_AVAHI_06
  87     if( state == AVAHI_CLIENT_FAILURE &&
  88         (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
  89 #else
  90     if( state == AVAHI_CLIENT_DISCONNECTED )
  91 #endif
  92     {
  93         msg_Err( p_sd, "avahi client disconnected" );
  94         avahi_simple_poll_quit( p_sys->simple_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 #ifdef HAVE_AVAHI_06
 114     AvahiLookupResultFlags flags,
 115 #endif
 116     void* userdata )
 117 {
 118     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 119     services_discovery_sys_t *p_sys = p_sd->p_sys;
 120
 121 #ifdef HAVE_AVAHI_06
 122     if( event == AVAHI_RESOLVER_FAILURE )
 123 #else
 124     if( event == AVAHI_RESOLVER_TIMEOUT )
 125 #endif
 126     {
 127         msg_Err( p_sd,
 128                  "failed to resolve service '%s' of type '%s' in domain '%s'",
 129                  name, type, domain );
 130     }
 131     else if( event == AVAHI_RESOLVER_FOUND )
 132     {
 133         char a[128];
 134         char *psz_uri = NULL;
 135         char *psz_addr = NULL;
 136         AvahiStringList *asl = NULL;
 137         input_item_t *p_input = NULL;
 138
 139         msg_Dbg( p_sd, "service '%s' of type '%s' in domain '%s'",
 140                  name, type, domain );
 141
 142         avahi_address_snprint(a, (sizeof(a)/sizeof(a[0]))-1, address);
 143         if( protocol == AVAHI_PROTO_INET6 )
 144             if( asprintf( &psz_addr, "[%s]", a ) == -1 )
 145                 return;
 146
 147         if( txt != NULL )
 148             asl = avahi_string_list_find( txt, "path" );
 149         if( asl != NULL )
 150         {
 151             size_t size;
 152             char *key = NULL;
 153             char *value = NULL;
 154             if( avahi_string_list_get_pair( asl, &key, &value, &size ) == 0 &&
 155                 value != NULL )
 156             {
 157                 if( asprintf( &psz_uri, "http://%s:%d%s",
 158                           psz_addr != NULL ? psz_addr : a, port, value ) == -1 )
 159                 {
 160                     free( psz_addr );
 161                     return;
 162                 }
 163             }
 164             if( key != NULL )
 165                 avahi_free( (void *)key );
 166             if( value != NULL )
 167                 avahi_free( (void *)value );
 168         }
 169         else
 170         {
 171             if( asprintf( &psz_uri, "http://%s:%d",
 172                       psz_addr != NULL ? psz_addr : a, port ) == -1 )
 173             {
 174                 free( psz_addr );
 175                 return;
 176             }
 177         }
 178
 179         if( psz_addr != NULL )
 180             free( (void *)psz_addr );
 181
 182         if( psz_uri != NULL )
 183         {
 184             p_input = input_ItemNewExt( p_sd, psz_uri, name, 0, NULL, -1 );
 185             free( (void *)psz_uri );
 186         }
 187         if( p_input != NULL )
 188         {
 189             vlc_dictionary_insert( &p_sys->services_name_to_input_item,
 190                 name, p_input );
 191             services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
 192        }
 193     }
 194
 195     avahi_service_resolver_free( r );
 196 }
 197
 198 /*****************************************************************************
 199  * browser_callback
 200  *****************************************************************************/
 201 static void browse_callback(
 202     AvahiServiceBrowser *b,
 203     AvahiIfIndex interface,
 204     AvahiProtocol protocol,
 205     AvahiBrowserEvent event,
 206     const char *name,
 207     const char *type,
 208     const char *domain,
 209 #ifdef HAVE_AVAHI_06
 210     AvahiLookupResultFlags flags,
 211 #endif
 212     void* userdata )
 213 {
 214     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 215     services_discovery_sys_t *p_sys = p_sd->p_sys;
 216     if( event == AVAHI_BROWSER_NEW )
 217     {
 218         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
 219                                         name, type, domain, AVAHI_PROTO_UNSPEC,
 220 #ifdef HAVE_AVAHI_06
 221                                         0,
 222 #endif
 223                                         resolve_callback, userdata ) == NULL )
 224         {
 225             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
 226                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 227         }
 228     }
 229     else if( name )
 230     {
 231         /** \todo Store the input id and search it, rather than searching the items */
 232         input_item_t *p_item;
 233         p_item = vlc_dictionary_value_for_key(
 234                         &p_sys->services_name_to_input_item,
 235                         name );
 236         if( !p_item )
 237             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
 238         else
 239         {
 240             services_discovery_RemoveItem( p_sd, p_item );
 241             vlc_dictionary_remove_value_for_key(
 242                         &p_sys->services_name_to_input_item,
 243                         name );
 244         }
 245     }
 246 }
 247
 248 /*****************************************************************************
 249  * Open: initialize and create stuff
 250  *****************************************************************************/
 251 static int Open( vlc_object_t *p_this )
 252 {
 253     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 254     services_discovery_sys_t *p_sys;
 255     int err;
 256
 257     p_sd->p_sys = p_sys = (services_discovery_sys_t *)malloc(
 258         sizeof( services_discovery_sys_t ) );
 259     if( p_sd->p_sys == NULL )
 260     {
 261         msg_Err( p_sd, "out of memory" );
 262         return VLC_EGENERIC;
 263     }
 264
 265     memset( p_sys, 0, sizeof(*p_sys) );
 266
 267     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 268
 269     p_sys->simple_poll = avahi_simple_poll_new();
 270     if( p_sys->simple_poll == NULL )
 271     {
 272         msg_Err( p_sd, "failed to create avahi simple poll" );
 273         goto error;
 274     }
 275
 276     p_sys->client = avahi_client_new( avahi_simple_poll_get(p_sys->simple_poll),
 277 #ifdef HAVE_AVAHI_06
 278                                       0,
 279 #endif
 280                                       client_callback, p_sd, &err );
 281     if( p_sys->client == NULL )
 282     {
 283         msg_Err( p_sd, "failed to create avahi client: %s",
 284                  avahi_strerror( err ) );
 285         goto error;
 286     }
 287
 288     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 289                                            AVAHI_PROTO_UNSPEC,
 290                                            "_vlc-http._tcp", NULL,
 291 #ifdef HAVE_AVAHI_06
 292                                            0,
 293 #endif
 294                                            browse_callback, p_sd );
 295     if( p_sys->sb == NULL )
 296     {
 297         msg_Err( p_sd, "failed to create avahi service browser" );
 298         goto error;
 299     }
 300
 301     services_discovery_SetLocalizedName( p_sd, _("Bonjour") );
 302
 303     p_sd->pf_run = Run;
 304
 305     return VLC_SUCCESS;
 306
 307 error:
 308     if( p_sys->sb != NULL )
 309         avahi_service_browser_free( p_sys->sb );
 310     if( p_sys->client != NULL )
 311         avahi_client_free( p_sys->client );
 312     if( p_sys->simple_poll != NULL )
 313         avahi_simple_poll_free( p_sys->simple_poll );
 314
 315     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
 316     free( p_sys );
 317
 318     return VLC_EGENERIC;
 319 }
 320
 321 /*****************************************************************************
 322  * Close: cleanup
 323  *****************************************************************************/
 324 static void Close( vlc_object_t *p_this )
 325 {
 326     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 327     services_discovery_sys_t *p_sys = p_sd->p_sys;
 328
 329     avahi_service_browser_free( p_sys->sb );
 330     avahi_client_free( p_sys->client );
 331     avahi_simple_poll_free( p_sys->simple_poll );
 332
 333     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
 334     free( p_sys );
 335 }
 336
 337 /*****************************************************************************
 338  * Run: main thread
 339  *****************************************************************************/
 340 static void Run( services_discovery_t *p_sd )
 341 {
 342     services_discovery_sys_t *p_sys = p_sd->p_sys;
 343
 344     while( !p_sd->b_die )
 345     {
 346         if( avahi_simple_poll_iterate( p_sys->simple_poll, 100 ) != 0 )
 347         {
 348             msg_Err( p_sd, "poll iterate failed" );
 349             break;
 350         }
 351     }
 352 }