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-common/alternative.h>
33 #include <avahi-common/simple-watch.h>
34 #include <avahi-common/malloc.h>
35 #include <avahi-common/error.h>
37 static AvahiEntryGroup *group = NULL;
38 static AvahiSimplePoll *simple_poll = NULL;
39 static char *name = NULL;
41 static void create_services(AvahiClient *c);
43 static void entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
46 /* Called whenever the entry group state changes */
48 if (state == AVAHI_ENTRY_GROUP_ESTABLISHED)
49 /* The entry group has been established successfully */
50 fprintf(stderr, "Service '%s' successfully established.\n", name);
52 else if (state == AVAHI_ENTRY_GROUP_COLLISION) {
55 /* A service name collision happened. Let's pick a new name */
56 n = avahi_alternative_service_name(name);
60 fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);
62 /* And recreate the services */
63 create_services(avahi_entry_group_get_client(g));
67 static void create_services(AvahiClient *c) {
72 /* If this is the first time we're called, let's create a new entry group */
74 if (!(group = avahi_entry_group_new(c, entry_group_callback, NULL))) {
75 fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_client_errno(c)));
80 fprintf(stderr, "Adding service '%s'\n", name);
82 /* Create some random TXT data */
83 snprintf(r, sizeof(r), "random=%i", rand());
85 /* Add the service for IPP */
86 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) {
87 fprintf(stderr, "Failed to add _ipp._tcp service: %s\n", avahi_strerror(ret));
91 /* Add the same service for BSD LPR */
92 if ((ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) {
93 fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret));
97 /* Add an additional (hypothetic) subtype */
98 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)) {
99 fprintf(stderr, "Failed to add subtype _magic._sub._printer._tcp: %s\n", avahi_strerror(ret));
103 /* Tell the server to register the service */
104 if ((ret = avahi_entry_group_commit(group)) < 0) {
105 fprintf(stderr, "Failed to commit entry_group: %s\n", avahi_strerror(ret));
112 avahi_simple_poll_quit(simple_poll);
116 static void client_callback(AvahiClient *c, AvahiClientState state, void * userdata) {
119 /* Called whenever the client or server state changes */
121 if (state == AVAHI_CLIENT_S_RUNNING)
122 /* The serve has startup successfully and registered its host
123 * name on the network, so it's time to create our services */
126 else if (state == AVAHI_CLIENT_S_COLLISION) {
127 /* Let's drop our registered services. When the server is back
128 * in AVAHI_SERVER_RUNNING state we will register them
129 * again with the new host name. */
131 avahi_entry_group_reset(group);
133 } else if (state == AVAHI_CLIENT_DISCONNECTED) {
135 fprintf(stderr, "Server connection terminated.\n");
136 avahi_simple_poll_quit(simple_poll);
140 int main(int argc, char*argv[]) {
141 AvahiClient *client = NULL;
145 /* Allocate main loop object */
146 if (!(simple_poll = avahi_simple_poll_new())) {
147 fprintf(stderr, "Failed to create simple poll object.\n");
151 name = avahi_strdup("MegaPrinter");
153 /* Allocate a new client */
154 client = avahi_client_new(avahi_simple_poll_get(simple_poll), client_callback, NULL, &error);
156 /* Check wether creating the client object succeeded */
158 fprintf(stderr, "Failed to create client: %s\n", avahi_strerror(error));
162 /* Run the main loop */
164 if (avahi_simple_poll_iterate(simple_poll, -1) != 0)
173 avahi_entry_group_free(group);
176 avahi_client_free(client);
179 avahi_simple_poll_free(simple_poll);