4 * This file demonstrates how to use Avahi's core API, this is
5 * the embeddable mDNS stack for embedded applications.
7 * End user applications should *not* use this API and should use
8 * the DBUS or C APIs, please see
9 * client-browse-services.c and glib-integration.c
11 * I repeat, you probably do *not* want to use this example.
15 This file is part of avahi.
17 avahi is free software; you can redistribute it and/or modify it
18 under the terms of the GNU Lesser General Public License as
19 published by the Free Software Foundation; either version 2.1 of the
20 License, or (at your option) any later version.
22 avahi is distributed in the hope that it will be useful, but WITHOUT
23 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
25 Public License for more details.
27 You should have received a copy of the GNU Lesser General Public
28 License along with avahi; if not, write to the Free Software
29 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
42 #include <avahi-core/core.h>
43 #include <avahi-core/lookup.h>
44 #include <avahi-common/simple-watch.h>
45 #include <avahi-common/malloc.h>
46 #include <avahi-common/error.h>
48 static AvahiSimplePoll *simple_poll = NULL;
49 static AvahiServer *server = NULL;
51 static void resolve_callback(
52 AvahiSServiceResolver *r,
53 AvahiIfIndex interface,
54 AvahiProtocol protocol,
55 AvahiResolverEvent event,
59 const char *host_name,
60 const AvahiAddress *address,
63 AvahiLookupResultFlags flags,
68 /* Called whenever a service has been resolved successfully or timed out */
71 case AVAHI_RESOLVER_TIMEOUT:
72 case AVAHI_RESOLVER_NOT_FOUND:
73 case AVAHI_RESOLVER_FAILURE:
74 fprintf(stderr, "Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain,
75 event == AVAHI_RESOLVER_TIMEOUT ? "TIMEOUT" : (event == AVAHI_RESOLVER_NOT_FOUND ? "NOT_FOUND" : "FAILURE"));
78 case AVAHI_RESOLVER_FOUND: {
81 fprintf(stderr, "Service '%s' of type '%s' in domain '%s':\n", name, type, domain);
83 avahi_address_snprint(a, sizeof(a), address);
84 t = avahi_string_list_to_string(txt);
95 avahi_string_list_get_service_cookie(txt),
96 avahi_server_is_service_local(server, interface, protocol, name, type, domain),
97 !!(flags & AVAHI_LOOKUP_RESULT_WIDE_AREA),
98 !!(flags & AVAHI_LOOKUP_RESULT_MULTICAST),
99 !!(flags & AVAHI_LOOKUP_RESULT_CACHED));
104 avahi_s_service_resolver_free(r);
107 static void browse_callback(
108 AvahiSServiceBrowser *b,
109 AvahiIfIndex interface,
110 AvahiProtocol protocol,
111 AvahiBrowserEvent event,
115 AvahiLookupResultFlags flags,
118 AvahiServer *s = userdata;
121 /* Called whenever a new services becomes available on the LAN or is removed from the LAN */
125 case AVAHI_BROWSER_FAILURE:
126 case AVAHI_BROWSER_NOT_FOUND:
128 fprintf(stderr, "(Browser) %s\n", event == AVAHI_BROWSER_FAILURE ? "FAILURE" : "NOT_FOUND");
129 avahi_simple_poll_quit(simple_poll);
132 case AVAHI_BROWSER_NEW:
133 fprintf(stderr, "(Browser) NEW: service '%s' of type '%s' in domain '%s'\n", name, type, domain);
135 /* We ignore the returned resolver object. In the callback
136 function we free it. If the server is terminated before
137 the callback function is called the server will free
138 the resolver for us. */
140 if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_UNSPEC, 0, resolve_callback, s)))
141 fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
145 case AVAHI_BROWSER_REMOVE:
146 fprintf(stderr, "(Browser) REMOVE: service '%s' of type '%s' in domain '%s'\n", name, type, domain);
149 case AVAHI_BROWSER_ALL_FOR_NOW:
150 case AVAHI_BROWSER_CACHE_EXHAUSTED:
151 fprintf(stderr, "(Browser) %s\n", event == AVAHI_BROWSER_CACHE_EXHAUSTED ? "CACHE_EXHAUSTED" : "ALL_FOR_NOW");
156 int main(int argc, char*argv[]) {
157 AvahiServerConfig config;
158 AvahiSServiceBrowser *sb = NULL;
162 /* Initialize the psuedo-RNG */
165 /* Allocate main loop object */
166 if (!(simple_poll = avahi_simple_poll_new())) {
167 fprintf(stderr, "Failed to create simple poll object.\n");
171 /* Do not publish any local records */
172 avahi_server_config_init(&config);
173 config.publish_hinfo = 0;
174 config.publish_addresses = 0;
175 config.publish_workstation = 0;
176 config.publish_domain = 0;
178 /* Set a unicast DNS server for wide area DNS-SD */
179 avahi_address_parse("192.168.50.1", AVAHI_PROTO_UNSPEC, &config.wide_area_servers[0]);
180 config.n_wide_area_servers = 1;
181 config.enable_wide_area = 1;
183 /* Allocate a new server */
184 server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
186 /* Free the configuration data */
187 avahi_server_config_free(&config);
189 /* Check wether creating the server object succeeded */
191 fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
195 /* Create the service browser */
196 if (!(sb = avahi_s_service_browser_new(server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_http._tcp", NULL, 0, browse_callback, server))) {
197 fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
201 /* Run the main loop */
203 if (avahi_simple_poll_iterate(simple_poll, -1) != 0)
212 avahi_s_service_browser_free(sb);
215 avahi_server_free(server);
218 avahi_simple_poll_free(simple_poll);