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) {
49 /* Called whenever the entry group state changes */
52 case AVAHI_ENTRY_GROUP_ESTABLISHED :
53 /* The entry group has been established successfully */
54 fprintf(stderr, "Service '%s' successfully established.\n", name);
57 case AVAHI_ENTRY_GROUP_COLLISION : {
60 /* A service name collision happened. Let's pick a new name */
61 n = avahi_alternative_service_name(name);
65 fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);
67 /* And recreate the services */
68 create_services(avahi_entry_group_get_client(g));
72 case AVAHI_ENTRY_GROUP_FAILURE :
74 fprintf(stderr, "Entry group failure: %s\n", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
76 /* Some kind of failure happened while we were registering our services */
77 avahi_simple_poll_quit(simple_poll);
80 case AVAHI_ENTRY_GROUP_UNCOMMITED:
81 case AVAHI_ENTRY_GROUP_REGISTERING:
86 static void create_services(AvahiClient *c) {
91 /* If this is the first time we're called, let's create a new entry group */
93 if (!(group = avahi_entry_group_new(c, entry_group_callback, NULL))) {
94 fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_client_errno(c)));
98 fprintf(stderr, "Adding service '%s'\n", name);
100 /* Create some random TXT data */
101 snprintf(r, sizeof(r), "random=%i", rand());
103 /* Add the service for IPP */
104 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) {
105 fprintf(stderr, "Failed to add _ipp._tcp service: %s\n", avahi_strerror(ret));
109 /* Add the same service for BSD LPR */
110 if ((ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) {
111 fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret));
115 /* Add an additional (hypothetic) subtype */
116 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)) {
117 fprintf(stderr, "Failed to add subtype _magic._sub._printer._tcp: %s\n", avahi_strerror(ret));
121 /* Tell the server to register the service */
122 if ((ret = avahi_entry_group_commit(group)) < 0) {
123 fprintf(stderr, "Failed to commit entry_group: %s\n", avahi_strerror(ret));
130 avahi_simple_poll_quit(simple_poll);
133 static void client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata) {
136 /* Called whenever the client or server state changes */
139 case AVAHI_CLIENT_S_RUNNING:
141 /* The server has startup successfully and registered its host
142 * name on the network, so it's time to create our services */
147 case AVAHI_CLIENT_FAILURE:
149 fprintf(stderr, "Client failure: %s\n", avahi_strerror(avahi_client_errno(c)));
150 avahi_simple_poll_quit(simple_poll);
154 case AVAHI_CLIENT_S_COLLISION:
156 /* Let's drop our registered services. When the server is back
157 * in AVAHI_SERVER_RUNNING state we will register them
158 * again with the new host name. */
160 case AVAHI_CLIENT_S_REGISTERING:
162 /* The server records are now being established. This
163 * might be caused by a host name change. We need to wait
164 * for our own records to register until the host name is
165 * properly esatblished. */
168 avahi_entry_group_reset(group);
172 case AVAHI_CLIENT_CONNECTING:
177 static void modify_callback(AVAHI_GCC_UNUSED AvahiTimeout *e, void *userdata) {
178 AvahiClient *client = userdata;
180 fprintf(stderr, "Doing some weird modification\n");
183 name = avahi_strdup("Modified MegaPrinter");
185 /* If the server is currently running, we need to remove our
186 * service and create it anew */
187 if (avahi_client_get_state(client) == AVAHI_CLIENT_S_RUNNING) {
189 /* Remove the old services */
191 avahi_entry_group_reset(group);
193 /* And create them again with the new name */
194 create_services(client);
198 int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
199 AvahiClient *client = NULL;
204 /* Allocate main loop object */
205 if (!(simple_poll = avahi_simple_poll_new())) {
206 fprintf(stderr, "Failed to create simple poll object.\n");
210 name = avahi_strdup("MegaPrinter");
212 /* Allocate a new client */
213 client = avahi_client_new(avahi_simple_poll_get(simple_poll), 0, client_callback, NULL, &error);
215 /* Check wether creating the client object succeeded */
217 fprintf(stderr, "Failed to create client: %s\n", avahi_strerror(error));
221 /* After 20s do some weird modification to the service */
222 avahi_simple_poll_get(simple_poll)->timeout_new(
223 avahi_simple_poll_get(simple_poll),
224 avahi_elapse_time(&tv, 1000*10, 0),
228 /* Run the main loop */
229 avahi_simple_poll_loop(simple_poll);
238 avahi_client_free(client);
241 avahi_simple_poll_free(simple_poll);