forked from jbagg/QtZeroConf
298 lines
8.4 KiB
C
298 lines
8.4 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 <stdlib.h>
|
|
|
|
#include <avahi-common/domain.h>
|
|
#include <avahi-common/timeval.h>
|
|
#include <avahi-common/malloc.h>
|
|
#include <avahi-common/error.h>
|
|
|
|
#include "browse.h"
|
|
#include "log.h"
|
|
|
|
#define TIMEOUT_MSEC 5000
|
|
|
|
struct AvahiSHostNameResolver {
|
|
AvahiServer *server;
|
|
char *host_name;
|
|
|
|
AvahiSRecordBrowser *record_browser_a;
|
|
AvahiSRecordBrowser *record_browser_aaaa;
|
|
|
|
AvahiSHostNameResolverCallback callback;
|
|
void* userdata;
|
|
|
|
AvahiRecord *address_record;
|
|
AvahiIfIndex interface;
|
|
AvahiProtocol protocol;
|
|
AvahiLookupResultFlags flags;
|
|
|
|
AvahiTimeEvent *time_event;
|
|
|
|
AVAHI_LLIST_FIELDS(AvahiSHostNameResolver, resolver);
|
|
};
|
|
|
|
static void finish(AvahiSHostNameResolver *r, AvahiResolverEvent event) {
|
|
assert(r);
|
|
|
|
if (r->time_event) {
|
|
avahi_time_event_free(r->time_event);
|
|
r->time_event = NULL;
|
|
}
|
|
|
|
switch (event) {
|
|
case AVAHI_RESOLVER_FOUND: {
|
|
AvahiAddress a;
|
|
|
|
assert(r->address_record);
|
|
|
|
switch (r->address_record->key->type) {
|
|
case AVAHI_DNS_TYPE_A:
|
|
a.proto = AVAHI_PROTO_INET;
|
|
a.data.ipv4 = r->address_record->data.a.address;
|
|
break;
|
|
|
|
case AVAHI_DNS_TYPE_AAAA:
|
|
a.proto = AVAHI_PROTO_INET6;
|
|
a.data.ipv6 = r->address_record->data.aaaa.address;
|
|
break;
|
|
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
r->callback(r, r->interface, r->protocol, AVAHI_RESOLVER_FOUND, r->address_record->key->name, &a, r->flags, r->userdata);
|
|
break;
|
|
|
|
}
|
|
|
|
case AVAHI_RESOLVER_FAILURE:
|
|
|
|
r->callback(r, r->interface, r->protocol, event, r->host_name, NULL, r->flags, r->userdata);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
|
|
AvahiSHostNameResolver *r = userdata;
|
|
|
|
assert(e);
|
|
assert(r);
|
|
|
|
avahi_server_set_errno(r->server, AVAHI_ERR_TIMEOUT);
|
|
finish(r, AVAHI_RESOLVER_FAILURE);
|
|
}
|
|
|
|
static void start_timeout(AvahiSHostNameResolver *r) {
|
|
struct timeval tv;
|
|
assert(r);
|
|
|
|
if (r->time_event)
|
|
return;
|
|
|
|
avahi_elapse_time(&tv, TIMEOUT_MSEC, 0);
|
|
|
|
r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
|
|
}
|
|
|
|
static void record_browser_callback(
|
|
AvahiSRecordBrowser*rr,
|
|
AvahiIfIndex interface,
|
|
AvahiProtocol protocol,
|
|
AvahiBrowserEvent event,
|
|
AvahiRecord *record,
|
|
AvahiLookupResultFlags flags,
|
|
void* userdata) {
|
|
|
|
AvahiSHostNameResolver *r = userdata;
|
|
|
|
assert(rr);
|
|
assert(r);
|
|
|
|
|
|
switch (event) {
|
|
case AVAHI_BROWSER_NEW:
|
|
assert(record);
|
|
assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
|
|
|
|
if (r->interface > 0 && interface != r->interface)
|
|
return;
|
|
|
|
if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
|
|
return;
|
|
|
|
if (r->interface <= 0)
|
|
r->interface = interface;
|
|
|
|
if (r->protocol == AVAHI_PROTO_UNSPEC)
|
|
r->protocol = protocol;
|
|
|
|
if (!r->address_record) {
|
|
r->address_record = avahi_record_ref(record);
|
|
r->flags = flags;
|
|
|
|
finish(r, AVAHI_RESOLVER_FOUND);
|
|
}
|
|
|
|
break;
|
|
|
|
case AVAHI_BROWSER_REMOVE:
|
|
assert(record);
|
|
assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
|
|
|
|
if (r->address_record && avahi_record_equal_no_ttl(record, r->address_record)) {
|
|
avahi_record_unref(r->address_record);
|
|
r->address_record = NULL;
|
|
|
|
r->flags = flags;
|
|
|
|
|
|
/** Look for a replacement */
|
|
if (r->record_browser_aaaa)
|
|
avahi_s_record_browser_restart(r->record_browser_aaaa);
|
|
if (r->record_browser_a)
|
|
avahi_s_record_browser_restart(r->record_browser_a);
|
|
|
|
start_timeout(r);
|
|
}
|
|
|
|
break;
|
|
|
|
case AVAHI_BROWSER_CACHE_EXHAUSTED:
|
|
case AVAHI_BROWSER_ALL_FOR_NOW:
|
|
/* Ignore */
|
|
break;
|
|
|
|
case AVAHI_BROWSER_FAILURE:
|
|
|
|
/* Stop browsers */
|
|
|
|
if (r->record_browser_aaaa)
|
|
avahi_s_record_browser_free(r->record_browser_aaaa);
|
|
if (r->record_browser_a)
|
|
avahi_s_record_browser_free(r->record_browser_a);
|
|
|
|
r->record_browser_a = r->record_browser_aaaa = NULL;
|
|
r->flags = flags;
|
|
|
|
finish(r, AVAHI_RESOLVER_FAILURE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
AvahiSHostNameResolver *avahi_s_host_name_resolver_new(
|
|
AvahiServer *server,
|
|
AvahiIfIndex interface,
|
|
AvahiProtocol protocol,
|
|
const char *host_name,
|
|
AvahiProtocol aprotocol,
|
|
AvahiLookupFlags flags,
|
|
AvahiSHostNameResolverCallback callback,
|
|
void* userdata) {
|
|
|
|
AvahiSHostNameResolver *r;
|
|
AvahiKey *k;
|
|
|
|
assert(server);
|
|
assert(host_name);
|
|
assert(callback);
|
|
|
|
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
|
|
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
|
|
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, avahi_is_valid_fqdn(host_name), AVAHI_ERR_INVALID_HOST_NAME);
|
|
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(aprotocol), AVAHI_ERR_INVALID_PROTOCOL);
|
|
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
|
|
|
|
if (!(r = avahi_new(AvahiSHostNameResolver, 1))) {
|
|
avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
|
|
return NULL;
|
|
}
|
|
|
|
r->server = server;
|
|
r->host_name = avahi_normalize_name_strdup(host_name);
|
|
r->callback = callback;
|
|
r->userdata = userdata;
|
|
r->address_record = NULL;
|
|
r->interface = interface;
|
|
r->protocol = protocol;
|
|
r->flags = 0;
|
|
|
|
r->record_browser_a = r->record_browser_aaaa = NULL;
|
|
|
|
r->time_event = NULL;
|
|
|
|
AVAHI_LLIST_PREPEND(AvahiSHostNameResolver, resolver, server->host_name_resolvers, r);
|
|
|
|
r->record_browser_aaaa = r->record_browser_a = NULL;
|
|
|
|
if (aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_UNSPEC) {
|
|
k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
|
|
r->record_browser_a = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r);
|
|
avahi_key_unref(k);
|
|
|
|
if (!r->record_browser_a)
|
|
goto fail;
|
|
}
|
|
|
|
if (aprotocol == AVAHI_PROTO_INET6 || aprotocol == AVAHI_PROTO_UNSPEC) {
|
|
k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
|
|
r->record_browser_aaaa = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r);
|
|
avahi_key_unref(k);
|
|
|
|
if (!r->record_browser_aaaa)
|
|
goto fail;
|
|
}
|
|
|
|
assert(r->record_browser_aaaa || r->record_browser_a);
|
|
|
|
start_timeout(r);
|
|
|
|
return r;
|
|
|
|
fail:
|
|
avahi_s_host_name_resolver_free(r);
|
|
return NULL;
|
|
}
|
|
|
|
void avahi_s_host_name_resolver_free(AvahiSHostNameResolver *r) {
|
|
assert(r);
|
|
|
|
AVAHI_LLIST_REMOVE(AvahiSHostNameResolver, resolver, r->server->host_name_resolvers, r);
|
|
|
|
if (r->record_browser_a)
|
|
avahi_s_record_browser_free(r->record_browser_a);
|
|
|
|
if (r->record_browser_aaaa)
|
|
avahi_s_record_browser_free(r->record_browser_aaaa);
|
|
|
|
if (r->time_event)
|
|
avahi_time_event_free(r->time_event);
|
|
|
|
if (r->address_record)
|
|
avahi_record_unref(r->address_record);
|
|
|
|
avahi_free(r->host_name);
|
|
avahi_free(r);
|
|
}
|