4 This file is part of avahi.
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.
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.
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
31 #include <avahi-client/client.h>
32 #include <avahi-client/publish.h>
34 #include <avahi-common/alternative.h>
35 #include <avahi-common/simple-watch.h>
36 #include <avahi-common/malloc.h>
37 #include <avahi-common/error.h>
38 #include <avahi-common/timeval.h>
40 static AvahiEntryGroup *group = NULL;
41 static AvahiSimplePoll *simple_poll = NULL;
42 static char *name = NULL;
44 static void create_services(AvahiClient *c);
46 static void entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) {
47 assert(g == group || group == NULL);
50 /* Called whenever the entry group state changes */
53 case AVAHI_ENTRY_GROUP_ESTABLISHED :
54 /* The entry group has been established successfully */
55 fprintf(stderr, "Service '%s' successfully established.\n", name);
58 case AVAHI_ENTRY_GROUP_COLLISION : {
61 /* A service name collision with a remote service
62 * happened. Let's pick a new name */
63 n = avahi_alternative_service_name(name);
67 fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);
69 /* And recreate the services */
70 create_services(avahi_entry_group_get_client(g));
74 case AVAHI_ENTRY_GROUP_FAILURE :
76 fprintf(stderr, "Entry group failure: %s\n", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
78 /* Some kind of failure happened while we were registering our services */
79 avahi_simple_poll_quit(simple_poll);
82 case AVAHI_ENTRY_GROUP_UNCOMMITED:
83 case AVAHI_ENTRY_GROUP_REGISTERING:
88 static void create_services(AvahiClient *c) {
93 /* If this is the first time we're called, let's create a new
94 * entry group if necessary */
97 if (!(group = avahi_entry_group_new(c, entry_group_callback, NULL))) {
98 fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_client_errno(c)));
102 /* If the group is empty (either because it was just created, or
103 * because it was reset previously, add our entries. */
105 if (avahi_entry_group_is_empty(group)) {
106 fprintf(stderr, "Adding service '%s'\n", name);
108 /* Create some random TXT data */
109 snprintf(r, sizeof(r), "random=%i", rand());
111 /* We will now add two services and one subtype to the entry
112 * group. The two services have the same name, but differ in
113 * the service type (IPP vs. BSD LPR). Only services with the
114 * same name should be put in the same entry group. */
116 /* Add the service for IPP */
117 if ((ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_ipp._tcp", NULL, NULL, 651, "test=blah", r, NULL)) < 0) {
119 if (ret == AVAHI_ERR_COLLISION)
122 fprintf(stderr, "Failed to add _ipp._tcp service: %s\n", avahi_strerror(ret));
126 /* Add the same service for BSD LPR */
127 if ((ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) {
129 if (ret == AVAHI_ERR_COLLISION)
132 fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret));
136 /* Add an additional (hypothetic) subtype */
137 if ((ret = avahi_entry_group_add_service_subtype(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, "_magic._sub._printer._tcp") < 0)) {
138 fprintf(stderr, "Failed to add subtype _magic._sub._printer._tcp: %s\n", avahi_strerror(ret));
142 /* Tell the server to register the service */
143 if ((ret = avahi_entry_group_commit(group)) < 0) {
144 fprintf(stderr, "Failed to commit entry group: %s\n", avahi_strerror(ret));
153 /* A service name collision with a local service happened. Let's
155 n = avahi_alternative_service_name(name);
159 fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);
161 avahi_entry_group_reset(group);
167 avahi_simple_poll_quit(simple_poll);
170 static void client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata) {
173 /* Called whenever the client or server state changes */
176 case AVAHI_CLIENT_S_RUNNING:
178 /* The server has startup successfully and registered its host
179 * name on the network, so it's time to create our services */
183 case AVAHI_CLIENT_FAILURE:
185 fprintf(stderr, "Client failure: %s\n", avahi_strerror(avahi_client_errno(c)));
186 avahi_simple_poll_quit(simple_poll);
190 case AVAHI_CLIENT_S_COLLISION:
192 /* Let's drop our registered services. When the server is back
193 * in AVAHI_SERVER_RUNNING state we will register them
194 * again with the new host name. */
196 case AVAHI_CLIENT_S_REGISTERING:
198 /* The server records are now being established. This
199 * might be caused by a host name change. We need to wait
200 * for our own records to register until the host name is
201 * properly esatblished. */
204 avahi_entry_group_reset(group);
208 case AVAHI_CLIENT_CONNECTING:
213 static void modify_callback(AVAHI_GCC_UNUSED AvahiTimeout *e, void *userdata) {
214 AvahiClient *client = userdata;
216 fprintf(stderr, "Doing some weird modification\n");
219 name = avahi_strdup("Modified MegaPrinter");
221 /* If the server is currently running, we need to remove our
222 * service and create it anew */
223 if (avahi_client_get_state(client) == AVAHI_CLIENT_S_RUNNING) {
225 /* Remove the old services */
227 avahi_entry_group_reset(group);
229 /* And create them again with the new name */
230 create_services(client);
234 int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
235 AvahiClient *client = NULL;
240 /* Allocate main loop object */
241 if (!(simple_poll = avahi_simple_poll_new())) {
242 fprintf(stderr, "Failed to create simple poll object.\n");
246 name = avahi_strdup("MegaPrinter");
248 /* Allocate a new client */
249 client = avahi_client_new(avahi_simple_poll_get(simple_poll), 0, client_callback, NULL, &error);
251 /* Check wether creating the client object succeeded */
253 fprintf(stderr, "Failed to create client: %s\n", avahi_strerror(error));
257 /* After 10s do some weird modification to the service */
258 avahi_simple_poll_get(simple_poll)->timeout_new(
259 avahi_simple_poll_get(simple_poll),
260 avahi_elapse_time(&tv, 1000*10, 0),
264 /* Run the main loop */
265 avahi_simple_poll_loop(simple_poll);
274 avahi_client_free(client);
277 avahi_simple_poll_free(simple_poll);