You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
281 lines
8.5 KiB
C
281 lines
8.5 KiB
C
/***
|
|
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/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 AvahiTimeVal 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;
|
|
}
|