/***
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
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 */
case AVAHI_ENTRY_GROUP_COLLISION : {
char *n;
-
- /* A service name collision happened. Let's pick a new name */
+
+ /* 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;
int ret;
assert(c);
- /* If this is the first time we're called, let's create a new entry group */
+ /* 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;
}
-
- 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_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, 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_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) {
- fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret));
- goto fail;
- }
+ /* If the group is empty (either because it was just created, or
+ * because it was reset previously, add our entries. */
- /* 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;
+ 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());
+
+ /* 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) {
+ char *n;
+
+ /* 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);
+
+ create_services(c);
+ return;
+ }
+
+ 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) {
+ 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;
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 */
- if (!group)
- create_services(c);
+ 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:
fprintf(stderr, "Doing some weird modification\n");
- avahi_free(name);
- name = avahi_strdup("Modified MegaPrinter");
+ avahi_free(name);
+ name = avahi_strdup("Modified MegaPrinter");
/* If the server is currently running, we need to remove our
* service and create it anew */
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 */
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_simple_poll_free(simple_poll);
avahi_free(name);
-
+
return ret;
}
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