bd24106670f245ce44b7263f3440a0b7b000f7d6
[vlc.git] / 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 }