1/* $Id$ */
2
3/***
4  This file is part of avahi.
5
6  avahi is free software; you can redistribute it and/or modify it
7  under the terms of the GNU Lesser General Public License as
8  published by the Free Software Foundation; either version 2.1 of the
9  License, or (at your option) any later version.
10
11  avahi is distributed in the hope that it will be useful, but WITHOUT
12  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14  Public License for more details.
15
16  You should have received a copy of the GNU Lesser General Public
17  License along with avahi; if not, write to the Free Software
18  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19  USA.
20***/
21
22#ifdef HAVE_CONFIG_H
23#include <config.h>
24#endif
25
26#include <time.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <assert.h>
30
31#include <avahi-core/core.h>
32#include <avahi-core/publish.h>
33#include <avahi-common/simple-watch.h>
34#include <avahi-common/malloc.h>
35#include <avahi-common/alternative.h>
36#include <avahi-common/error.h>
37
38static AvahiSEntryGroup *group = NULL;
39static AvahiSimplePoll *simple_poll = NULL;
40static char *name = NULL;
41
42static void create_services(AvahiServer *s);
43
44static void entry_group_callback(AvahiServer *s, AvahiSEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) {
45    assert(s);
46    assert(g == group);
47
48    /* Called whenever the entry group state changes */
49
50    switch (state) {
51
52        case AVAHI_ENTRY_GROUP_ESTABLISHED:
53
54            /* The entry group has been established successfully */
55            fprintf(stderr, "Service '%s' successfully established.\n", name);
56            break;
57
58        case AVAHI_ENTRY_GROUP_COLLISION: {
59            char *n;
60
61            /* A service name collision happened. Let's pick a new name */
62            n = avahi_alternative_service_name(name);
63            avahi_free(name);
64            name = n;
65
66            fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);
67
68            /* And recreate the services */
69            create_services(s);
70            break;
71        }
72
73        case AVAHI_ENTRY_GROUP_FAILURE :
74
75            fprintf(stderr, "Entry group failure: %s\n", avahi_strerror(avahi_server_errno(s)));
76
77            /* Some kind of failure happened while we were registering our services */
78            avahi_simple_poll_quit(simple_poll);
79            break;
80
81        case AVAHI_ENTRY_GROUP_UNCOMMITED:
82        case AVAHI_ENTRY_GROUP_REGISTERING:
83            ;
84    }
85}
86
87static void create_services(AvahiServer *s) {
88    char r[128];
89    int ret;
90    assert(s);
91
92    /* If this is the first time we're called, let's create a new entry group */
93    if (!group)
94        if (!(group = avahi_s_entry_group_new(s, entry_group_callback, NULL))) {
95            fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_server_errno(s)));
96            goto fail;
97        }
98
99    fprintf(stderr, "Adding service '%s'\n", name);
100
101    /* Create some random TXT data */
102    snprintf(r, sizeof(r), "random=%i", rand());
103
104    /* Add the service for IPP */
105    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) {
106        fprintf(stderr, "Failed to add _ipp._tcp service: %s\n", avahi_strerror(ret));
107        goto fail;
108    }
109
110    /* Add the same service for BSD LPR */
111    if ((ret = avahi_server_add_service(s, group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) {
112        fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret));
113        goto fail;
114    }
115
116    /* Add an additional (hypothetic) subtype */
117    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)) {
118        fprintf(stderr, "Failed to add subtype _magic._sub._printer._tcp: %s\n", avahi_strerror(ret));
119        goto fail;
120    }
121
122    /* Tell the server to register the service */
123    if ((ret = avahi_s_entry_group_commit(group)) < 0) {
124        fprintf(stderr, "Failed to commit entry_group: %s\n", avahi_strerror(ret));
125        goto fail;
126    }
127
128    return;
129
130fail:
131    avahi_simple_poll_quit(simple_poll);
132}
133
134static void server_callback(AvahiServer *s, AvahiServerState state, AVAHI_GCC_UNUSED void * userdata) {
135    assert(s);
136
137    /* Called whenever the server state changes */
138
139    switch (state) {
140
141        case AVAHI_SERVER_RUNNING:
142            /* The serve has startup successfully and registered its host
143             * name on the network, so it's time to create our services */
144
145            if (!group)
146                create_services(s);
147
148            break;
149
150        case AVAHI_SERVER_COLLISION: {
151            char *n;
152            int r;
153
154            /* A host name collision happened. Let's pick a new name for the server */
155            n = avahi_alternative_host_name(avahi_server_get_host_name(s));
156            fprintf(stderr, "Host name collision, retrying with '%s'\n", n);
157            r = avahi_server_set_host_name(s, n);
158            avahi_free(n);
159
160            if (r < 0) {
161                fprintf(stderr, "Failed to set new host name: %s\n", avahi_strerror(r));
162
163                avahi_simple_poll_quit(simple_poll);
164                return;
165            }
166
167        }
168
169            /* Fall through */
170
171        case AVAHI_SERVER_REGISTERING:
172
173	    /* Let's drop our registered services. When the server is back
174             * in AVAHI_SERVER_RUNNING state we will register them
175             * again with the new host name. */
176            if (group)
177                avahi_s_entry_group_reset(group);
178
179            break;
180
181        case AVAHI_SERVER_FAILURE:
182
183            /* Terminate on failure */
184
185            fprintf(stderr, "Server failure: %s\n", avahi_strerror(avahi_server_errno(s)));
186            avahi_simple_poll_quit(simple_poll);
187            break;
188
189        case AVAHI_SERVER_INVALID:
190            ;
191    }
192}
193
194int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
195    AvahiServerConfig config;
196    AvahiServer *server = NULL;
197    int error;
198    int ret = 1;
199
200    /* Initialize the pseudo-RNG */
201    srand(time(NULL));
202
203    /* Allocate main loop object */
204    if (!(simple_poll = avahi_simple_poll_new())) {
205        fprintf(stderr, "Failed to create simple poll object.\n");
206        goto fail;
207    }
208
209    name = avahi_strdup("MegaPrinter");
210
211    /* Let's set the host name for this server. */
212    avahi_server_config_init(&config);
213    config.host_name = avahi_strdup("gurkiman");
214    config.publish_workstation = 0;
215
216    /* Allocate a new server */
217    server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, server_callback, NULL, &error);
218
219    /* Free the configuration data */
220    avahi_server_config_free(&config);
221
222    /* Check wether creating the server object succeeded */
223    if (!server) {
224        fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
225        goto fail;
226    }
227
228    /* Run the main loop */
229    avahi_simple_poll_loop(simple_poll);
230
231    ret = 0;
232
233fail:
234
235    /* Cleanup things */
236
237    if (server)
238        avahi_server_free(server);
239
240    if (simple_poll)
241        avahi_simple_poll_free(simple_poll);
242
243    avahi_free(name);
244
245    return ret;
246}
247