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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/* $Id$ */
/***
This file is part of avahi.
avahi is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
avahi is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <avahi-core/core.h>
#include <avahi-core/publish.h>
#include <avahi-common/simple-watch.h>
#include <avahi-common/malloc.h>
#include <avahi-common/alternative.h>
#include <avahi-common/error.h>
static AvahiSEntryGroup *group = NULL;
static AvahiSimplePoll *simple_poll = NULL;
static char *name = NULL;
static void create_services(AvahiServer *s);
static void entry_group_callback(AvahiServer *s, AvahiSEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
assert(s);
assert(g == group);
/* Called whenever the entry group state changes */
if (state == AVAHI_ENTRY_GROUP_ESTABLISHED)
/* The entry group has been established successfully */
fprintf(stderr, "Service '%s' successfully established.\n", name);
else if (state == AVAHI_ENTRY_GROUP_COLLISION) {
char *n;
/* A service name collision happened. Let's pick a new name */
n = avahi_alternative_service_name(name);
avahi_free(name);
name = n;
fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);
/* And recreate the services */
create_services(s);
}
}
static void create_services(AvahiServer *s) {
char r[128];
int ret;
assert(s);
/* If this is the first time we're called, let's create a new entry group */
if (!group) {
if (!(group = avahi_s_entry_group_new(s, entry_group_callback, NULL))) {
fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_server_errno(s)));
goto fail;
}
}
fprintf(stderr, "Adding service '%s'\n", name);
/* Create some random TXT data */
snprintf(r, sizeof(r), "random=%i", rand());
/* Add the service for IPP */
if ((ret = avahi_server_add_service(s, group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_ipp._tcp", NULL, NULL, 651, "test=blah", r, NULL)) < 0) {
fprintf(stderr, "Failed to add _ipp._tcp service: %s\n", avahi_strerror(ret));
goto fail;
}
/* Add the same service for BSD LPR */
if ((ret = avahi_server_add_service(s, group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) {
fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret));
goto fail;
}
/* Add an additional (hypothetic) subtype */
if ((ret = avahi_server_add_service_subtype(s, group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, "_magic._sub._printer._tcp") < 0)) {
fprintf(stderr, "Failed to add subtype _magic._sub._printer._tcp: %s\n", avahi_strerror(ret));
goto fail;
}
/* Tell the server to register the service */
if ((ret = avahi_s_entry_group_commit(group)) < 0) {
fprintf(stderr, "Failed to commit entry_group: %s\n", avahi_strerror(ret));
goto fail;
}
return;
fail:
avahi_simple_poll_quit(simple_poll);
return;
}
static void server_callback(AvahiServer *s, AvahiServerState state, void * userdata) {
assert(s);
/* Called whenever the server state changes */
if (state == AVAHI_SERVER_RUNNING)
/* The serve has startup successfully and registered its host
* name on the network, so it's time to create our services */
create_services(s);
else if (state == AVAHI_SERVER_COLLISION) {
char *n;
int r;
/* A host name collision happened. Let's pick a new name for the server */
n = avahi_alternative_host_name(avahi_server_get_host_name(s));
fprintf(stderr, "Host name collision, retrying with '%s'\n", n);
r = avahi_server_set_host_name(s, n);
avahi_free(n);
if (r < 0) {
fprintf(stderr, "Failed to set new host name: %s\n", avahi_strerror(r));
avahi_simple_poll_quit(simple_poll);
return;
}
/* Let's drop our registered services. When the server is back
* in AVAHI_SERVER_RUNNING state we will register them
* again with the new host name. */
if (group)
avahi_s_entry_group_reset(group);
}
}
int main(int argc, char*argv[]) {
AvahiServerConfig config;
AvahiServer *server = NULL;
int error;
int ret = 1;
/* Initialize the pseudo-RNG */
srand(time(NULL));
/* Allocate main loop object */
if (!(simple_poll = avahi_simple_poll_new())) {
fprintf(stderr, "Failed to create simple poll object.\n");
goto fail;
}
name = avahi_strdup("MegaPrinter");
/* Let's set the host name for this server. */
avahi_server_config_init(&config);
config.host_name = avahi_strdup("gurkiman");
config.publish_workstation = 0;
/* Allocate a new server */
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, server_callback, NULL, &error);
/* Free the configuration data */
avahi_server_config_free(&config);
/* Check wether creating the server object succeeded */
if (!server) {
fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
goto fail;
}
/* Run the main loop */
for (;;)
if (avahi_simple_poll_iterate(simple_poll, -1) != 0)
break;
ret = 0;
fail:
/* Cleanup things */
if (group)
avahi_s_entry_group_free(group);
if (server)
avahi_server_free(server);
if (simple_poll)
avahi_simple_poll_free(simple_poll);
avahi_free(name);
return ret;
}
|
