forked from mikebrady/shairport-sync
-
Notifications
You must be signed in to change notification settings - Fork 0
/
mdns_avahi.c
190 lines (158 loc) · 5.58 KB
/
mdns_avahi.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/*
* Embedded Avahi client. This file is part of Shairport.
* Copyright (c) James Laird 2013
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <avahi-client/client.h>
#include <avahi-client/publish.h>
#include <avahi-common/thread-watch.h>
#include <avahi-common/error.h>
#include <string.h>
#include "common.h"
#include "mdns.h"
static AvahiClient *client = NULL;
static AvahiEntryGroup *group = NULL;
static AvahiThreadedPoll *tpoll = NULL;
static pthread_t tpoll_id;
static char *name = NULL;
static int port = 0;
static void register_service( AvahiClient *c );
static void egroup_callback(AvahiEntryGroup *g, AvahiEntryGroupState state,
AVAHI_GCC_UNUSED void *userdata) {
switch ( state )
{
case AVAHI_ENTRY_GROUP_ESTABLISHED:
/* The entry group has been established successfully */
inform("Service '%s' successfully established.\n", name );
tpoll_id = pthread_self();
break;
case AVAHI_ENTRY_GROUP_COLLISION:
{
char *n;
/* A service name collision with a remote service
* happened. Let's pick a new name */
n = avahi_alternative_service_name( name );
avahi_free( name );
name = n;
warn( "Service name collision, renaming service to '%s'\n", name );
/* And recreate the services */
register_service( avahi_entry_group_get_client( g ) );
break;
}
case AVAHI_ENTRY_GROUP_FAILURE:
die( "Entry group failure: %s\n", avahi_strerror( avahi_client_errno( avahi_entry_group_get_client( g ) ) ) );
break;
case AVAHI_ENTRY_GROUP_UNCOMMITED:
debug(1, "Service '%s' group is not yet commited.\n", name );
break;
case AVAHI_ENTRY_GROUP_REGISTERING:
inform( "Service '%s' group is registering.\n", name );
break;
}
}
static void register_service(AvahiClient *c) {
debug(1, "avahi: register_service.");
if (!group)
group = avahi_entry_group_new(c, egroup_callback, NULL);
if (!group)
die("avahi_entry_group_new failed");
if (!avahi_entry_group_is_empty(group))
return;
int ret;
#ifdef CONFIG_METADATA
if (config.metadata_enabled) {
debug(1, "Avahi with metadata");
ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name,
"_raop._tcp", NULL, NULL, port, MDNS_RECORD_WITH_METADATA,
NULL);
} else {
#endif
debug(1, "Avahi without metadata");
ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name,
"_raop._tcp", NULL, NULL, port,
MDNS_RECORD_WITHOUT_METADATA, NULL);
#ifdef CONFIG_METADATA
}
#endif
if (ret < 0)
die("avahi_entry_group_add_service failed");
ret = avahi_entry_group_commit(group);
if (ret < 0)
die("avahi_entry_group_commit failed");
}
static void client_callback(AvahiClient *c, AvahiClientState state,
AVAHI_GCC_UNUSED void *userdata) {
switch (state) {
case AVAHI_CLIENT_S_REGISTERING:
if (group)
avahi_entry_group_reset(group);
break;
case AVAHI_CLIENT_S_RUNNING:
register_service(c);
break;
case AVAHI_CLIENT_FAILURE:
die("avahi client failure");
break;
case AVAHI_CLIENT_S_COLLISION:
warn( "Avahi state is AVAHI_CLIENT_S_COLLISION...would have killed the service: %s\n", name );
break;
case AVAHI_CLIENT_CONNECTING:
inform( "Received AVAHI_CLIENT_CONNECTING\n" );
break;
default:
warn( "Unhandled avahi state: %d\n", state );
break;
}
}
static int avahi_register(char *srvname, int srvport) {
debug(1, "avahi: avahi_register.");
name = strdup(srvname);
port = srvport;
int err;
if (!(tpoll = avahi_threaded_poll_new())) {
warn("couldn't create avahi threaded tpoll!");
return -1;
}
if (!(client =
avahi_client_new(avahi_threaded_poll_get(tpoll), 0, client_callback, NULL, &err))) {
warn("couldn't create avahi client: %s!", avahi_strerror(err));
return -1;
}
if (avahi_threaded_poll_start(tpoll) < 0) {
warn("couldn't start avahi tpoll thread");
return -1;
}
return 0;
}
static void avahi_unregister(void) {
debug(1, "avahi: avahi_unregister.");
if (tpoll)
avahi_threaded_poll_stop(tpoll);
tpoll = NULL;
if (name)
free(name);
name = NULL;
}
mdns_backend mdns_avahi = {
.name = "avahi", .mdns_register = avahi_register, .mdns_unregister = avahi_unregister};