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"));
77 case AVAHI_RESOLVER_FOUND: {
80 fprintf(stderr, "Service '%s' of type '%s' in domain '%s':\n", name, type, domain);
82 avahi_address_snprint(a, sizeof(a), address);
83 t = avahi_string_list_to_string(txt);
94 avahi_string_list_get_service_cookie(txt),
95 avahi_server_is_service_local(server, interface, protocol, name, type, domain),
96 !!(flags & AVAHI_LOOKUP_RESULT_WIDE_AREA),
97 !!(flags & AVAHI_LOOKUP_RESULT_MULTICAST),
98 !!(flags & AVAHI_LOOKUP_RESULT_CACHED));
103 avahi_s_service_resolver_free(r);
106 static void browse_callback(
107 AvahiSServiceBrowser *b,
108 AvahiIfIndex interface,
109 AvahiProtocol protocol,
110 AvahiBrowserEvent event,
114 AvahiLookupResultFlags flags,
117 AvahiServer *s = userdata;
120 /* Called whenever a new services becomes available on the LAN or is removed from the LAN */
124 case AVAHI_BROWSER_FAILURE:
125 case AVAHI_BROWSER_NOT_FOUND:
127 fprintf(stderr, "(Browser) %s\n", event == AVAHI_BROWSER_FAILURE ? "FAILURE" : "NOT_FOUND");
128 avahi_simple_poll_quit(simple_poll);
131 case AVAHI_BROWSER_NEW:
132 fprintf(stderr, "(Browser) NEW: service '%s' of type '%s' in domain '%s'\n", name, type, domain);
134 /* We ignore the returned resolver object. In the callback
135 function we free it. If the server is terminated before
136 the callback function is called the server will free
137 the resolver for us. */
139 if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_UNSPEC, 0, resolve_callback, s)))
140 fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
144 case AVAHI_BROWSER_REMOVE:
145 fprintf(stderr, "(Browser) REMOVE: service '%s' of type '%s' in domain '%s'\n", name, type, domain);
148 case AVAHI_BROWSER_ALL_FOR_NOW:
149 case AVAHI_BROWSER_CACHE_EXHAUSTED:
150 fprintf(stderr, "(Browser) %s\n", event == AVAHI_BROWSER_CACHE_EXHAUSTED ? "CACHE_EXHAUSTED" : "ALL_FOR_NOW");
155 int main(int argc, char*argv[]) {
156 AvahiServerConfig config;
157 AvahiSServiceBrowser *sb;
161 /* Initialize the psuedo-RNG */
164 /* Allocate main loop object */
165 if (!(simple_poll = avahi_simple_poll_new())) {
166 fprintf(stderr, "Failed to create simple poll object.\n");
170 /* Do not publish any local records */
171 avahi_server_config_init(&config);
172 config.publish_hinfo = 0;
173 config.publish_addresses = 0;
174 config.publish_workstation = 0;
175 config.publish_domain = 0;
177 /* Set a unicast DNS server for wide area DNS-SD */
178 avahi_address_parse("192.168.50.1", AVAHI_PROTO_UNSPEC, &config.wide_area_servers[0]);
179 config.n_wide_area_servers = 1;
180 config.enable_wide_area = 1;
182 /* Allocate a new server */
183 server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
185 /* Free the configuration data */
186 avahi_server_config_free(&config);
188 /* Check wether creating the server object succeeded */
190 fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
194 /* Create the service browser */
195 if (!(sb = avahi_s_service_browser_new(server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_http._tcp", NULL, 0, browse_callback, server))) {
196 fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
200 /* Run the main loop */
202 if (avahi_simple_poll_iterate(simple_poll, -1) != 0)
211 avahi_s_service_browser_free(sb);
214 avahi_server_free(server);
217 avahi_simple_poll_free(simple_poll);