forked from jbagg/QtZeroConf
323 lines
8.6 KiB
C
323 lines
8.6 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 <string.h>
|
|
|
|
#include <avahi-common/domain.h>
|
|
#include <avahi-common/malloc.h>
|
|
#include <avahi-common/error.h>
|
|
|
|
#include "browse.h"
|
|
#include "log.h"
|
|
#include "rr.h"
|
|
|
|
typedef struct AvahiDNSServerInfo AvahiDNSServerInfo;
|
|
|
|
struct AvahiDNSServerInfo {
|
|
AvahiSDNSServerBrowser *browser;
|
|
|
|
AvahiIfIndex interface;
|
|
AvahiProtocol protocol;
|
|
AvahiRecord *srv_record;
|
|
AvahiSHostNameResolver *host_name_resolver;
|
|
AvahiAddress address;
|
|
AvahiLookupResultFlags flags;
|
|
|
|
AVAHI_LLIST_FIELDS(AvahiDNSServerInfo, info);
|
|
};
|
|
|
|
struct AvahiSDNSServerBrowser {
|
|
AvahiServer *server;
|
|
|
|
AvahiSRecordBrowser *record_browser;
|
|
AvahiSDNSServerBrowserCallback callback;
|
|
void* userdata;
|
|
AvahiProtocol aprotocol;
|
|
AvahiLookupFlags user_flags;
|
|
|
|
unsigned n_info;
|
|
|
|
AVAHI_LLIST_FIELDS(AvahiSDNSServerBrowser, browser);
|
|
AVAHI_LLIST_HEAD(AvahiDNSServerInfo, info);
|
|
};
|
|
|
|
static AvahiDNSServerInfo* get_server_info(AvahiSDNSServerBrowser *b, AvahiIfIndex interface, AvahiProtocol protocol, AvahiRecord *r) {
|
|
AvahiDNSServerInfo *i;
|
|
|
|
assert(b);
|
|
assert(r);
|
|
|
|
for (i = b->info; i; i = i->info_next)
|
|
if (i->interface == interface &&
|
|
i->protocol == protocol &&
|
|
avahi_record_equal_no_ttl(r, i->srv_record))
|
|
return i;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void server_info_free(AvahiSDNSServerBrowser *b, AvahiDNSServerInfo *i) {
|
|
assert(b);
|
|
assert(i);
|
|
|
|
avahi_record_unref(i->srv_record);
|
|
if (i->host_name_resolver)
|
|
avahi_s_host_name_resolver_free(i->host_name_resolver);
|
|
|
|
AVAHI_LLIST_REMOVE(AvahiDNSServerInfo, info, b->info, i);
|
|
|
|
assert(b->n_info >= 1);
|
|
b->n_info--;
|
|
|
|
avahi_free(i);
|
|
}
|
|
|
|
static void host_name_resolver_callback(
|
|
AvahiSHostNameResolver *r,
|
|
AVAHI_GCC_UNUSED AvahiIfIndex interface,
|
|
AVAHI_GCC_UNUSED AvahiProtocol protocol,
|
|
AvahiResolverEvent event,
|
|
const char *host_name,
|
|
const AvahiAddress *a,
|
|
AvahiLookupResultFlags flags,
|
|
void* userdata) {
|
|
|
|
AvahiDNSServerInfo *i = userdata;
|
|
|
|
assert(r);
|
|
assert(host_name);
|
|
assert(i);
|
|
|
|
switch (event) {
|
|
case AVAHI_RESOLVER_FOUND: {
|
|
i->address = *a;
|
|
|
|
i->browser->callback(
|
|
i->browser,
|
|
i->interface,
|
|
i->protocol,
|
|
AVAHI_BROWSER_NEW,
|
|
i->srv_record->data.srv.name,
|
|
&i->address,
|
|
i->srv_record->data.srv.port,
|
|
i->flags | flags,
|
|
i->browser->userdata);
|
|
|
|
break;
|
|
}
|
|
|
|
case AVAHI_RESOLVER_FAILURE:
|
|
/* Ignore */
|
|
break;
|
|
}
|
|
|
|
avahi_s_host_name_resolver_free(i->host_name_resolver);
|
|
i->host_name_resolver = NULL;
|
|
}
|
|
|
|
static void record_browser_callback(
|
|
AvahiSRecordBrowser*rr,
|
|
AvahiIfIndex interface,
|
|
AvahiProtocol protocol,
|
|
AvahiBrowserEvent event,
|
|
AvahiRecord *record,
|
|
AvahiLookupResultFlags flags,
|
|
void* userdata) {
|
|
|
|
AvahiSDNSServerBrowser *b = userdata;
|
|
|
|
assert(rr);
|
|
assert(b);
|
|
|
|
/* Filter flags */
|
|
flags &= AVAHI_LOOKUP_RESULT_CACHED | AVAHI_LOOKUP_RESULT_MULTICAST | AVAHI_LOOKUP_RESULT_WIDE_AREA;
|
|
|
|
switch (event) {
|
|
case AVAHI_BROWSER_NEW: {
|
|
AvahiDNSServerInfo *i;
|
|
|
|
assert(record);
|
|
assert(record->key->type == AVAHI_DNS_TYPE_SRV);
|
|
|
|
if (get_server_info(b, interface, protocol, record))
|
|
return;
|
|
|
|
if (b->n_info >= 10)
|
|
return;
|
|
|
|
if (!(i = avahi_new(AvahiDNSServerInfo, 1)))
|
|
return; /* OOM */
|
|
|
|
i->browser = b;
|
|
i->interface = interface;
|
|
i->protocol = protocol;
|
|
i->srv_record = avahi_record_ref(record);
|
|
i->host_name_resolver = avahi_s_host_name_resolver_new(
|
|
b->server,
|
|
interface, protocol,
|
|
record->data.srv.name,
|
|
b->aprotocol,
|
|
b->user_flags,
|
|
host_name_resolver_callback, i);
|
|
i->flags = flags;
|
|
|
|
AVAHI_LLIST_PREPEND(AvahiDNSServerInfo, info, b->info, i);
|
|
|
|
b->n_info++;
|
|
break;
|
|
}
|
|
|
|
case AVAHI_BROWSER_REMOVE: {
|
|
AvahiDNSServerInfo *i;
|
|
|
|
assert(record);
|
|
assert(record->key->type == AVAHI_DNS_TYPE_SRV);
|
|
|
|
if (!(i = get_server_info(b, interface, protocol, record)))
|
|
return;
|
|
|
|
if (!i->host_name_resolver)
|
|
b->callback(
|
|
b,
|
|
interface,
|
|
protocol,
|
|
event,
|
|
i->srv_record->data.srv.name,
|
|
&i->address,
|
|
i->srv_record->data.srv.port,
|
|
i->flags | flags,
|
|
b->userdata);
|
|
|
|
server_info_free(b, i);
|
|
break;
|
|
}
|
|
|
|
case AVAHI_BROWSER_FAILURE:
|
|
case AVAHI_BROWSER_ALL_FOR_NOW:
|
|
case AVAHI_BROWSER_CACHE_EXHAUSTED:
|
|
|
|
b->callback(
|
|
b,
|
|
interface,
|
|
protocol,
|
|
event,
|
|
NULL,
|
|
NULL,
|
|
0,
|
|
flags,
|
|
b->userdata);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
AvahiSDNSServerBrowser *avahi_s_dns_server_browser_new(
|
|
AvahiServer *server,
|
|
AvahiIfIndex interface,
|
|
AvahiProtocol protocol,
|
|
const char *domain,
|
|
AvahiDNSServerType type,
|
|
AvahiProtocol aprotocol,
|
|
AvahiLookupFlags flags,
|
|
AvahiSDNSServerBrowserCallback callback,
|
|
void* userdata) {
|
|
|
|
static const char * const type_table[AVAHI_DNS_SERVER_MAX] = {
|
|
"_domain._udp",
|
|
"_dns-update._udp"
|
|
};
|
|
|
|
AvahiSDNSServerBrowser *b;
|
|
AvahiKey *k = NULL;
|
|
char n[AVAHI_DOMAIN_NAME_MAX];
|
|
int r;
|
|
|
|
assert(server);
|
|
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_PROTO_VALID(aprotocol), AVAHI_ERR_INVALID_PROTOCOL);
|
|
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
|
|
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
|
|
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, type < AVAHI_DNS_SERVER_MAX, AVAHI_ERR_INVALID_FLAGS);
|
|
|
|
if (!domain)
|
|
domain = server->domain_name;
|
|
|
|
if ((r = avahi_service_name_join(n, sizeof(n), NULL, type_table[type], domain)) < 0) {
|
|
avahi_server_set_errno(server, r);
|
|
return NULL;
|
|
}
|
|
|
|
if (!(b = avahi_new(AvahiSDNSServerBrowser, 1))) {
|
|
avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
|
|
return NULL;
|
|
}
|
|
|
|
b->server = server;
|
|
b->callback = callback;
|
|
b->userdata = userdata;
|
|
b->aprotocol = aprotocol;
|
|
b->n_info = 0;
|
|
b->user_flags = flags;
|
|
|
|
AVAHI_LLIST_HEAD_INIT(AvahiDNSServerInfo, b->info);
|
|
AVAHI_LLIST_PREPEND(AvahiSDNSServerBrowser, browser, server->dns_server_browsers, b);
|
|
|
|
if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV))) {
|
|
avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
|
|
goto fail;
|
|
}
|
|
|
|
if (!(b->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, b)))
|
|
goto fail;
|
|
|
|
avahi_key_unref(k);
|
|
|
|
return b;
|
|
|
|
fail:
|
|
|
|
if (k)
|
|
avahi_key_unref(k);
|
|
|
|
avahi_s_dns_server_browser_free(b);
|
|
return NULL;
|
|
}
|
|
|
|
void avahi_s_dns_server_browser_free(AvahiSDNSServerBrowser *b) {
|
|
assert(b);
|
|
|
|
while (b->info)
|
|
server_info_free(b, b->info);
|
|
|
|
AVAHI_LLIST_REMOVE(AvahiSDNSServerBrowser, browser, b->server->dns_server_browsers, b);
|
|
|
|
if (b->record_browser)
|
|
avahi_s_record_browser_free(b->record_browser);
|
|
|
|
avahi_free(b);
|
|
}
|
|
|