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  • Committer: Chuck Short
  • Date: 2010-09-28 20:38:39 UTC
  • Revision ID: zulcss@ubuntu.com-20100928203839-pgjulytsi9ue63x1
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source4/nbt_server/defense.c
 
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/* 
 
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   Unix SMB/CIFS implementation.
 
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   defend our names against name registration requests
 
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   Copyright (C) Andrew Tridgell        2005
 
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   This program is free software; you can redistribute it and/or modify
 
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   it under the terms of the GNU General Public License as published by
 
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   the Free Software Foundation; either version 3 of the License, or
 
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   (at your option) any later version.
 
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   This program is distributed in the hope that it will be useful,
 
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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   GNU General Public License for more details.
 
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   You should have received a copy of the GNU General Public License
 
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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*/
 
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#include "includes.h"
 
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#include "../lib/util/dlinklist.h"
 
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#include "system/network.h"
 
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#include "nbt_server/nbt_server.h"
 
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#include "nbt_server/wins/winsserver.h"
 
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#include "librpc/gen_ndr/ndr_nbt.h"
 
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#include "lib/socket/socket.h"
 
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/*
 
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  defend our registered names against registration or name refresh
 
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  requests
 
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*/
 
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void nbtd_request_defense(struct nbt_name_socket *nbtsock, 
 
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                          struct nbt_name_packet *packet, 
 
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                          struct socket_address *src)
 
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{
 
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        struct nbtd_iface_name *iname;
 
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        struct nbt_name *name;
 
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        struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
 
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                                                       struct nbtd_interface);
 
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        /*
 
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         * if the packet comes from one of our interfaces
 
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         * it must be our winsclient trying to reach the winsserver
 
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         */
 
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        if (nbtd_self_packet(nbtsock, packet, src)) {
 
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                nbtd_winsserver_request(nbtsock, packet, src);
 
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                return;
 
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        }
 
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        NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
 
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        NBTD_ASSERT_PACKET(packet, src, packet->arcount == 1);
 
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        NBTD_ASSERT_PACKET(packet, src, 
 
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                           packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
 
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        NBTD_ASSERT_PACKET(packet, src, 
 
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                           packet->questions[0].question_class == NBT_QCLASS_IP);
 
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        NBTD_ASSERT_PACKET(packet, src, 
 
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                          packet->additional[0].rr_type == NBT_QTYPE_NETBIOS);
 
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        NBTD_ASSERT_PACKET(packet, src, 
 
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                          packet->additional[0].rr_class == NBT_QCLASS_IP);
 
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        NBTD_ASSERT_PACKET(packet, src, 
 
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                          packet->additional[0].rdata.netbios.length == 6);
 
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        /* see if we have the requested name on this interface */
 
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        name = &packet->questions[0].name;
 
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        iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
 
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        if (iname != NULL && 
 
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            !(name->type == NBT_NAME_LOGON || iname->nb_flags & NBT_NM_GROUP)) {
 
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                DEBUG(2,("Defending name %s on %s against %s\n",
 
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                         nbt_name_string(packet, name), 
 
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                         iface->bcast_address, src->addr));
 
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                nbtd_name_registration_reply(nbtsock, packet, src, NBT_RCODE_ACT);
 
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        } else {
 
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                nbtd_winsserver_request(nbtsock, packet, src);
 
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        }
 
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}