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Diffstat (limited to 'examples/core-browse-services.c')
| -rw-r--r-- | examples/core-browse-services.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/examples/core-browse-services.c b/examples/core-browse-services.c new file mode 100644 index 0000000..e062e3e --- /dev/null +++ b/examples/core-browse-services.c @@ -0,0 +1,213 @@ +/* PLEASE NOTE * + * This file demonstrates how to use Avahi's core API, this is + * the embeddable mDNS stack for embedded applications. + * + * End user applications should *not* use this API and should use + * the D-Bus or C APIs, please see + * client-browse-services.c and glib-integration.c + * + * I repeat, you probably do *not* want to use this example. + */ + +/*** + This file is part of avahi. + + avahi is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + avahi is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General + Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with avahi; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <assert.h> +#include <stdlib.h> +#include <time.h> + +#include <avahi-core/core.h> +#include <avahi-core/lookup.h> +#include <avahi-common/simple-watch.h> +#include <avahi-common/malloc.h> +#include <avahi-common/error.h> + +static AvahiSimplePoll *simple_poll = NULL; +static AvahiServer *server = NULL; + +static void resolve_callback( + AvahiSServiceResolver *r, + AVAHI_GCC_UNUSED AvahiIfIndex interface, + AVAHI_GCC_UNUSED AvahiProtocol protocol, + AvahiResolverEvent event, + const char *name, + const char *type, + const char *domain, + const char *host_name, + const AvahiAddress *address, + uint16_t port, + AvahiStringList *txt, + AvahiLookupResultFlags flags, + AVAHI_GCC_UNUSED void* userdata) { + + assert(r); + + /* Called whenever a service has been resolved successfully or timed out */ + + switch (event) { + case AVAHI_RESOLVER_FAILURE: + fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server))); + break; + + case AVAHI_RESOLVER_FOUND: { + char a[AVAHI_ADDRESS_STR_MAX], *t; + + fprintf(stderr, "(Resolver) Service '%s' of type '%s' in domain '%s':\n", name, type, domain); + + avahi_address_snprint(a, sizeof(a), address); + t = avahi_string_list_to_string(txt); + fprintf(stderr, + "\t%s:%u (%s)\n" + "\tTXT=%s\n" + "\tcookie is %u\n" + "\tis_local: %i\n" + "\twide_area: %i\n" + "\tmulticast: %i\n" + "\tcached: %i\n", + host_name, port, a, + t, + avahi_string_list_get_service_cookie(txt), + !!(flags & AVAHI_LOOKUP_RESULT_LOCAL), + !!(flags & AVAHI_LOOKUP_RESULT_WIDE_AREA), + !!(flags & AVAHI_LOOKUP_RESULT_MULTICAST), + !!(flags & AVAHI_LOOKUP_RESULT_CACHED)); + avahi_free(t); + } + } + + avahi_s_service_resolver_free(r); +} + +static void browse_callback( + AvahiSServiceBrowser *b, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiBrowserEvent event, + const char *name, + const char *type, + const char *domain, + AVAHI_GCC_UNUSED AvahiLookupResultFlags flags, + void* userdata) { + + AvahiServer *s = userdata; + assert(b); + + /* Called whenever a new services becomes available on the LAN or is removed from the LAN */ + + switch (event) { + + case AVAHI_BROWSER_FAILURE: + + fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server))); + avahi_simple_poll_quit(simple_poll); + return; + + case AVAHI_BROWSER_NEW: + fprintf(stderr, "(Browser) NEW: service '%s' of type '%s' in domain '%s'\n", name, type, domain); + + /* We ignore the returned resolver object. In the callback + function we free it. If the server is terminated before + the callback function is called the server will free + the resolver for us. */ + + if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_UNSPEC, 0, resolve_callback, s))) + fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s))); + + break; + + case AVAHI_BROWSER_REMOVE: + fprintf(stderr, "(Browser) REMOVE: service '%s' of type '%s' in domain '%s'\n", name, type, domain); + break; + + case AVAHI_BROWSER_ALL_FOR_NOW: + case AVAHI_BROWSER_CACHE_EXHAUSTED: + fprintf(stderr, "(Browser) %s\n", event == AVAHI_BROWSER_CACHE_EXHAUSTED ? "CACHE_EXHAUSTED" : "ALL_FOR_NOW"); + break; + } +} + +int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) { + AvahiServerConfig config; + AvahiSServiceBrowser *sb = NULL; + int error; + int ret = 1; + + /* Initialize the psuedo-RNG */ + srand(time(NULL)); + + /* Allocate main loop object */ + if (!(simple_poll = avahi_simple_poll_new())) { + fprintf(stderr, "Failed to create simple poll object.\n"); + goto fail; + } + + /* Do not publish any local records */ + avahi_server_config_init(&config); + config.publish_hinfo = 0; + config.publish_addresses = 0; + config.publish_workstation = 0; + config.publish_domain = 0; + + /* Set a unicast DNS server for wide area DNS-SD */ + avahi_address_parse("192.168.50.1", AVAHI_PROTO_UNSPEC, &config.wide_area_servers[0]); + config.n_wide_area_servers = 1; + config.enable_wide_area = 1; + + /* Allocate a new server */ + server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error); + + /* Free the configuration data */ + avahi_server_config_free(&config); + + /* Check wether creating the server object succeeded */ + if (!server) { + fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error)); + goto fail; + } + + /* Create the service browser */ + if (!(sb = avahi_s_service_browser_new(server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_http._tcp", NULL, 0, browse_callback, server))) { + fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server))); + goto fail; + } + + /* Run the main loop */ + avahi_simple_poll_loop(simple_poll); + + ret = 0; + +fail: + + /* Cleanup things */ + if (sb) + avahi_s_service_browser_free(sb); + + if (server) + avahi_server_free(server); + + if (simple_poll) + avahi_simple_poll_free(simple_poll); + + return ret; +} |