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/*
Unix SMB/CIFS implementation.
defend our names against name registration requests
Copyright (C) Andrew Tridgell 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/util/dlinklist.h"
#include "system/network.h"
#include "nbt_server/nbt_server.h"
#include "nbt_server/wins/winsserver.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "lib/socket/socket.h"
/*
defend our registered names against registration or name refresh
requests
*/
void nbtd_request_defense(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct socket_address *src)
{
struct nbtd_iface_name *iname;
struct nbt_name *name;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
struct nbtd_interface);
/*
* if the packet comes from one of our interfaces
* it must be our winsclient trying to reach the winsserver
*/
if (nbtd_self_packet(nbtsock, packet, src)) {
nbtd_winsserver_request(nbtsock, packet, src);
return;
}
NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
NBTD_ASSERT_PACKET(packet, src, packet->arcount == 1);
NBTD_ASSERT_PACKET(packet, src,
packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
NBTD_ASSERT_PACKET(packet, src,
packet->questions[0].question_class == NBT_QCLASS_IP);
NBTD_ASSERT_PACKET(packet, src,
packet->additional[0].rr_type == NBT_QTYPE_NETBIOS);
NBTD_ASSERT_PACKET(packet, src,
packet->additional[0].rr_class == NBT_QCLASS_IP);
NBTD_ASSERT_PACKET(packet, src,
packet->additional[0].rdata.netbios.length == 6);
/* see if we have the requested name on this interface */
name = &packet->questions[0].name;
iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
if (iname != NULL &&
!(name->type == NBT_NAME_LOGON || iname->nb_flags & NBT_NM_GROUP)) {
DEBUG(2,("Defending name %s on %s against %s\n",
nbt_name_string(packet, name),
iface->bcast_address, src->addr));
nbtd_name_registration_reply(nbtsock, packet, src, NBT_RCODE_ACT);
} else {
nbtd_winsserver_request(nbtsock, packet, src);
}
}
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