diff options
Diffstat (limited to 'examples/core-publish-service.c')
| -rw-r--r-- | examples/core-publish-service.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/examples/core-publish-service.c b/examples/core-publish-service.c new file mode 100644 index 0000000..dace548 --- /dev/null +++ b/examples/core-publish-service.c @@ -0,0 +1,200 @@ +/* $Id$ */ + +/*** + 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 <time.h> +#include <stdio.h> +#include <stdlib.h> +#include <assert.h> + +#include <avahi-core/core.h> +#include <avahi-common/simple-watch.h> +#include <avahi-common/malloc.h> + +static AvahiSEntryGroup *group = NULL; +static AvahiSimplePoll *simple_poll = NULL; +static char *name = NULL; + +static void create_services(AvahiServer *s); + +static void entry_group_callback(AvahiServer *s, AvahiSEntryGroup *g, AvahiEntryGroupState state, void *userdata) { + assert(s); + assert(g == group); + + /* Called whenever the entry group state changes */ + + if (state == AVAHI_ENTRY_GROUP_ESTABLISHED) + /* The entry group has been established successfully */ + fprintf(stderr, "Service '%s' successfully established.\n", name); + + else if (state == AVAHI_ENTRY_GROUP_COLLISION) { + char *n; + + /* A service name collision happened. Let's pick a new name */ + n = avahi_alternative_service_name(name); + avahi_free(name); + name = n; + + fprintf(stderr, "Service name collision, renaming service to '%s'\n", name); + + /* And recreate the services */ + create_services(s); + } +} + +static void create_services(AvahiServer *s) { + char r[128]; + int ret; + assert(s); + + /* If this is the first time we're called, let's create a new entry group */ + if (!group) { + if (!(group = avahi_s_entry_group_new(s, entry_group_callback, NULL))) { + fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_server_errno(s))); + goto fail; + } + } + + fprintf(stderr, "Adding service '%s'\n", name); + + /* Create some random TXT data */ + snprintf(r, sizeof(r), "random=%i", rand()); + + /* Add the service for IPP */ + if ((ret = avahi_server_add_service(s, group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, name, "_ipp._tcp", NULL, NULL, 651, "test=blah", r, NULL)) < 0) { + fprintf(stderr, "Failed to add _ipp._tcp service: %s\n", avahi_strerror(ret)); + goto fail; + } + + /* Add the same service for BSD LPR */ + if ((ret = avahi_server_add_service(s, group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) { + fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret)); + goto fail; + } + + /* Tell the server to register the service */ + if ((ret = avahi_s_entry_group_commit(group)) < 0) { + fprintf(stderr, "Failed to commit entry_group: %s\n", avahi_strerror(ret)); + goto fail; + } + + return; + +fail: + avahi_simple_poll_quit(simple_poll); + return; +} + +static void server_callback(AvahiServer *s, AvahiServerState state, void * userdata) { + assert(s); + + /* Called whenever the server state changes */ + + if (state == AVAHI_SERVER_RUNNING) + /* The serve has startup successfully and registered its host + * name on the network, so it's time to create our services */ + create_services(s); + + else if (state == AVAHI_SERVER_COLLISION) { + char *n; + int r; + + /* A host name collision happened. Let's pick a new name for the server */ + n = avahi_alternative_host_name(avahi_server_get_host_name(s)); + fprintf(stderr, "Host name collision, retrying with '%s'\n", n); + r = avahi_server_set_host_name(s, n); + avahi_free(n); + + if (r < 0) { + fprintf(stderr, "Failed to set new host name: %s\n", avahi_strerror(r)); + + avahi_simple_poll_quit(simple_poll); + return; + } + + /* Let's drop our registered services. When the server is back + * in AVAHI_SERVER_RUNNING state we will register them + * again with the new host name. */ + if (group) + avahi_s_entry_group_reset(group); + } +} + +int main(int argc, char*argv[]) { + AvahiServerConfig config; + AvahiServer *server = NULL; + int error; + int ret = 1; + + /* Initialize the pseudo-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; + } + + name = avahi_strdup("MegaPrinter"); + + /* Let's set the host name for this server. */ + avahi_server_config_init(&config); + config.host_name = avahi_strdup("gurkiman"); + config.publish_workstation = 0; + + /* Allocate a new server */ + server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, server_callback, 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; + } + + /* Run the main loop */ + for (;;) + if (avahi_simple_poll_iterate(simple_poll, -1) != 0) + break; + + ret = 0; + +fail: + + /* Cleanup things */ + if (group) + avahi_s_entry_group_free(group); + + if (server) + avahi_server_free(server); + + if (simple_poll) + avahi_simple_poll_free(simple_poll); + + avahi_free(name); + + return ret; +} |