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[vlc.git] / 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             vlc_gc_decref( p_input );
193        }
194     }
195
196     avahi_service_resolver_free( r );
197 }
198
199 /*****************************************************************************
200  * browser_callback
201  *****************************************************************************/
202 static void browse_callback(
203     AvahiServiceBrowser *b,
204     AvahiIfIndex interface,
205     AvahiProtocol protocol,
206     AvahiBrowserEvent event,
207     const char *name,
208     const char *type,
209     const char *domain,
210 #ifdef HAVE_AVAHI_06
211     AvahiLookupResultFlags flags,
212 #endif
213     void* userdata )
214 {
215     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
216     services_discovery_sys_t *p_sys = p_sd->p_sys;
217     if( event == AVAHI_BROWSER_NEW )
218     {
219         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
220                                         name, type, domain, AVAHI_PROTO_UNSPEC,
221 #ifdef HAVE_AVAHI_06
222                                         0,
223 #endif
224                                         resolve_callback, userdata ) == NULL )
225         {
226             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
227                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
228         }
229     }
230     else if( name )
231     {
232         /** \todo Store the input id and search it, rather than searching the items */
233         input_item_t *p_item;
234         p_item = vlc_dictionary_value_for_key(
235                         &p_sys->services_name_to_input_item,
236                         name );
237         if( !p_item )
238             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
239         else
240         {
241             services_discovery_RemoveItem( p_sd, p_item );
242             vlc_dictionary_remove_value_for_key(
243                         &p_sys->services_name_to_input_item,
244                         name );
245         }
246     }
247 }
248
249 /*****************************************************************************
250  * Open: initialize and create stuff
251  *****************************************************************************/
252 static int Open( vlc_object_t *p_this )
253 {
254     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
255     services_discovery_sys_t *p_sys;
256     int err;
257
258     p_sd->p_sys = p_sys = (services_discovery_sys_t *)malloc(
259         sizeof( services_discovery_sys_t ) );
260     if( p_sd->p_sys == NULL )
261     {
262         msg_Err( p_sd, "out of memory" );
263         return VLC_EGENERIC;
264     }
265
266     memset( p_sys, 0, sizeof(*p_sys) );
267
268     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
269
270     p_sys->simple_poll = avahi_simple_poll_new();
271     if( p_sys->simple_poll == NULL )
272     {
273         msg_Err( p_sd, "failed to create avahi simple poll" );
274         goto error;
275     }
276
277     p_sys->client = avahi_client_new( avahi_simple_poll_get(p_sys->simple_poll),
278 #ifdef HAVE_AVAHI_06
279                                       0,
280 #endif
281                                       client_callback, p_sd, &err );
282     if( p_sys->client == NULL )
283     {
284         msg_Err( p_sd, "failed to create avahi client: %s",
285                  avahi_strerror( err ) );
286         goto error;
287     }
288
289     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
290                                            AVAHI_PROTO_UNSPEC,
291                                            "_vlc-http._tcp", NULL,
292 #ifdef HAVE_AVAHI_06
293                                            0,
294 #endif
295                                            browse_callback, p_sd );
296     if( p_sys->sb == NULL )
297     {
298         msg_Err( p_sd, "failed to create avahi service browser" );
299         goto error;
300     }
301
302     services_discovery_SetLocalizedName( p_sd, _("Bonjour") );
303
304     p_sd->pf_run = Run;
305
306     return VLC_SUCCESS;
307
308 error:
309     if( p_sys->sb != NULL )
310         avahi_service_browser_free( p_sys->sb );
311     if( p_sys->client != NULL )
312         avahi_client_free( p_sys->client );
313     if( p_sys->simple_poll != NULL )
314         avahi_simple_poll_free( p_sys->simple_poll );
315
316     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
317     free( p_sys );
318
319     return VLC_EGENERIC;
320 }
321
322 /*****************************************************************************
323  * Close: cleanup
324  *****************************************************************************/
325 static void Close( vlc_object_t *p_this )
326 {
327     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
328     services_discovery_sys_t *p_sys = p_sd->p_sys;
329
330     avahi_service_browser_free( p_sys->sb );
331     avahi_client_free( p_sys->client );
332     avahi_simple_poll_free( p_sys->simple_poll );
333
334     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
335     free( p_sys );
336 }
337
338 /*****************************************************************************
339  * Run: main thread
340  *****************************************************************************/
341 static void Run( services_discovery_t *p_sd )
342 {
343     services_discovery_sys_t *p_sys = p_sd->p_sys;
344
345     while( !p_sd->b_die )
346     {
347         if( avahi_simple_poll_iterate( p_sys->simple_poll, 100 ) != 0 )
348         {
349             msg_Err( p_sd, "poll iterate failed" );
350             break;
351         }
352     }
353 }