| /*** |
| 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-client/client.h> |
| #include <avahi-client/publish.h> |
| |
| #include <avahi-common/alternative.h> |
| #include <avahi-common/simple-watch.h> |
| #include "avahi-common/avahi-malloc.h" |
| #include <avahi-common/error.h> |
| #include <avahi-common/timeval.h> |
| |
| static AvahiEntryGroup *group = NULL; |
| static AvahiSimplePoll *simple_poll = NULL; |
| static char *name = NULL; |
| |
| static void create_services(AvahiClient *c); |
| |
| static void entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) { |
| assert(g == group || group == NULL); |
| group = g; |
| |
| /* Called whenever the entry group state changes */ |
| |
| switch (state) { |
| case AVAHI_ENTRY_GROUP_ESTABLISHED : |
| /* The entry group has been established successfully */ |
| fprintf(stderr, "Service '%s' successfully established.\n", name); |
| break; |
| |
| case AVAHI_ENTRY_GROUP_COLLISION : { |
| char *n; |
| |
| /* A service name collision with a remote service |
| * 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(avahi_entry_group_get_client(g)); |
| break; |
| } |
| |
| case AVAHI_ENTRY_GROUP_FAILURE : |
| |
| fprintf(stderr, "Entry group failure: %s\n", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g)))); |
| |
| /* Some kind of failure happened while we were registering our services */ |
| avahi_simple_poll_quit(simple_poll); |
| break; |
| |
| case AVAHI_ENTRY_GROUP_UNCOMMITED: |
| case AVAHI_ENTRY_GROUP_REGISTERING: |
| ; |
| } |
| } |
| |
| static void create_services(AvahiClient *c) { |
| char *n, r[128]; |
| int ret; |
| assert(c); |
| |
| /* If this is the first time we're called, let's create a new |
| * entry group if necessary */ |
| |
| if (!group) |
| if (!(group = avahi_entry_group_new(c, entry_group_callback, NULL))) { |
| fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_client_errno(c))); |
| goto fail; |
| } |
| |
| /* If the group is empty (either because it was just created, or |
| * because it was reset previously, add our entries. */ |
| |
| if (avahi_entry_group_is_empty(group)) { |
| fprintf(stderr, "Adding service '%s'\n", name); |
| |
| /* Create some random TXT data */ |
| snprintf(r, sizeof(r), "random=%i", rand()); |
| |
| /* We will now add two services and one subtype to the entry |
| * group. The two services have the same name, but differ in |
| * the service type (IPP vs. BSD LPR). Only services with the |
| * same name should be put in the same entry group. */ |
| |
| /* Add the service for IPP */ |
| 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) { |
| |
| if (ret == AVAHI_ERR_COLLISION) |
| goto collision; |
| |
| 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_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) { |
| |
| if (ret == AVAHI_ERR_COLLISION) |
| goto collision; |
| |
| fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret)); |
| goto fail; |
| } |
| |
| /* Add an additional (hypothetic) subtype */ |
| 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)) { |
| fprintf(stderr, "Failed to add subtype _magic._sub._printer._tcp: %s\n", avahi_strerror(ret)); |
| goto fail; |
| } |
| |
| /* Tell the server to register the service */ |
| if ((ret = avahi_entry_group_commit(group)) < 0) { |
| fprintf(stderr, "Failed to commit entry group: %s\n", avahi_strerror(ret)); |
| goto fail; |
| } |
| } |
| |
| return; |
| |
| collision: |
| |
| /* A service name collision with a local service 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); |
| |
| avahi_entry_group_reset(group); |
| |
| create_services(c); |
| return; |
| |
| fail: |
| avahi_simple_poll_quit(simple_poll); |
| } |
| |
| static void client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata) { |
| assert(c); |
| |
| /* Called whenever the client or server state changes */ |
| |
| switch (state) { |
| case AVAHI_CLIENT_S_RUNNING: |
| |
| /* The server has startup successfully and registered its host |
| * name on the network, so it's time to create our services */ |
| create_services(c); |
| break; |
| |
| case AVAHI_CLIENT_FAILURE: |
| |
| fprintf(stderr, "Client failure: %s\n", avahi_strerror(avahi_client_errno(c))); |
| avahi_simple_poll_quit(simple_poll); |
| |
| break; |
| |
| case AVAHI_CLIENT_S_COLLISION: |
| |
| /* 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. */ |
| |
| case AVAHI_CLIENT_S_REGISTERING: |
| |
| /* The server records are now being established. This |
| * might be caused by a host name change. We need to wait |
| * for our own records to register until the host name is |
| * properly esatblished. */ |
| |
| if (group) |
| avahi_entry_group_reset(group); |
| |
| break; |
| |
| case AVAHI_CLIENT_CONNECTING: |
| ; |
| } |
| } |
| |
| static void modify_callback(AVAHI_GCC_UNUSED AvahiTimeout *e, void *userdata) { |
| AvahiClient *client = userdata; |
| |
| fprintf(stderr, "Doing some weird modification\n"); |
| |
| avahi_free(name); |
| name = avahi_strdup("Modified MegaPrinter"); |
| |
| /* If the server is currently running, we need to remove our |
| * service and create it anew */ |
| if (avahi_client_get_state(client) == AVAHI_CLIENT_S_RUNNING) { |
| |
| /* Remove the old services */ |
| if (group) |
| avahi_entry_group_reset(group); |
| |
| /* And create them again with the new name */ |
| create_services(client); |
| } |
| } |
| |
| int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) { |
| AvahiClient *client = NULL; |
| int error; |
| int ret = 1; |
| struct timeval tv; |
| |
| /* 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"); |
| |
| /* Allocate a new client */ |
| client = avahi_client_new(avahi_simple_poll_get(simple_poll), 0, client_callback, NULL, &error); |
| |
| /* Check wether creating the client object succeeded */ |
| if (!client) { |
| fprintf(stderr, "Failed to create client: %s\n", avahi_strerror(error)); |
| goto fail; |
| } |
| |
| /* After 10s do some weird modification to the service */ |
| avahi_simple_poll_get(simple_poll)->timeout_new( |
| avahi_simple_poll_get(simple_poll), |
| avahi_elapse_time(&tv, 1000*10, 0), |
| modify_callback, |
| client); |
| |
| /* Run the main loop */ |
| avahi_simple_poll_loop(simple_poll); |
| |
| ret = 0; |
| |
| fail: |
| |
| /* Cleanup things */ |
| |
| if (client) |
| avahi_client_free(client); |
| |
| if (simple_poll) |
| avahi_simple_poll_free(simple_poll); |
| |
| avahi_free(name); |
| |
| return ret; |
| } |