/* 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_data, 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); } }