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/* $Id$ */
/***
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;
AVAHI_LLIST_FIELDS(AvahiDNSServerInfo, info);
};
struct AvahiSDNSServerBrowser {
AvahiServer *server;
char *domain_name;
AvahiSRecordBrowser *record_browser;
AvahiSDNSServerBrowserCallback callback;
void* userdata;
AvahiProtocol aprotocol;
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, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, const char *host_name, const AvahiAddress *a, void* userdata) {
AvahiDNSServerInfo *i = userdata;
assert(r);
assert(host_name);
assert(i);
if (event == 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->browser->userdata);
}
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, void* userdata) {
AvahiSDNSServerBrowser *b = userdata;
assert(rr);
assert(record);
assert(b);
assert(record->key->type == AVAHI_DNS_TYPE_SRV);
if (event == AVAHI_BROWSER_NEW) {
AvahiDNSServerInfo *i;
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, host_name_resolver_callback, i);
AVAHI_LLIST_PREPEND(AvahiDNSServerInfo, info, b->info, i);
b->n_info++;
} else if (event == AVAHI_BROWSER_REMOVE) {
AvahiDNSServerInfo *i;
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, b->userdata);
server_info_free(b, i);
}
}
AvahiSDNSServerBrowser *avahi_s_dns_server_browser_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *domain, AvahiDNSServerType type, AvahiProtocol aprotocol, AvahiSDNSServerBrowserCallback callback, void* userdata) {
AvahiSDNSServerBrowser *b;
AvahiKey *k;
char *n = NULL;
assert(server);
assert(callback);
assert(type == AVAHI_DNS_SERVER_RESOLVE || type == AVAHI_DNS_SERVER_UPDATE);
if (domain && !avahi_is_valid_domain_name(domain)) {
avahi_server_set_errno(server, AVAHI_ERR_INVALID_DOMAIN_NAME);
return NULL;
}
if (!(b = avahi_new(AvahiSDNSServerBrowser, 1))) {
avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
return NULL;
}
b->server = server;
b->domain_name = avahi_normalize_name(domain ? domain : "local");
b->callback = callback;
b->userdata = userdata;
b->aprotocol = aprotocol;
b->n_info = 0;
AVAHI_LLIST_HEAD_INIT(AvahiDNSServerInfo, b->info);
AVAHI_LLIST_PREPEND(AvahiSDNSServerBrowser, browser, server->dns_server_browsers, b);
n = avahi_strdup_printf("%s.%s",type == AVAHI_DNS_SERVER_RESOLVE ? "_domain._udp" : "_dns-update._udp", b->domain_name);
k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
avahi_free(n);
b->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, b);
avahi_key_unref(k);
if (!b->record_browser) {
avahi_s_dns_server_browser_free(b);
return NULL;
}
return b;
}
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->domain_name);
avahi_free(b);
}
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