| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 |
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| 4 | defend our names against name registration requests
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| 5 |
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| 6 | Copyright (C) Andrew Tridgell 2005
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| 7 |
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| 8 | This program is free software; you can redistribute it and/or modify
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| 9 | it under the terms of the GNU General Public License as published by
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| 10 | the Free Software Foundation; either version 3 of the License, or
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| 11 | (at your option) any later version.
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| 12 |
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| 13 | This program is distributed in the hope that it will be useful,
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | GNU General Public License for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License
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| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 20 | */
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| 21 |
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| 22 | #include "includes.h"
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| 23 | #include "../lib/util/dlinklist.h"
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| 24 | #include "system/network.h"
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| 25 | #include "nbt_server/nbt_server.h"
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| 26 | #include "nbt_server/wins/winsserver.h"
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| 27 | #include "librpc/gen_ndr/ndr_nbt.h"
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| 28 | #include "lib/socket/socket.h"
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| 29 |
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| 30 |
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| 31 | /*
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| 32 | defend our registered names against registration or name refresh
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| 33 | requests
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| 34 | */
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| 35 | void nbtd_request_defense(struct nbt_name_socket *nbtsock,
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| 36 | struct nbt_name_packet *packet,
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| 37 | struct socket_address *src)
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| 38 | {
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| 39 | struct nbtd_iface_name *iname;
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| 40 | struct nbt_name *name;
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| 41 | struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
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| 42 | struct nbtd_interface);
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| 43 |
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| 44 | /*
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| 45 | * if the packet comes from one of our interfaces
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| 46 | * it must be our winsclient trying to reach the winsserver
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| 47 | */
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| 48 | if (nbtd_self_packet(nbtsock, packet, src)) {
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| 49 | nbtd_winsserver_request(nbtsock, packet, src);
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| 50 | return;
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| 51 | }
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| 52 |
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| 53 | NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
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| 54 | NBTD_ASSERT_PACKET(packet, src, packet->arcount == 1);
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| 55 | NBTD_ASSERT_PACKET(packet, src,
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| 56 | packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
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| 57 | NBTD_ASSERT_PACKET(packet, src,
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| 58 | packet->questions[0].question_class == NBT_QCLASS_IP);
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| 59 | NBTD_ASSERT_PACKET(packet, src,
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| 60 | packet->additional[0].rr_type == NBT_QTYPE_NETBIOS);
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| 61 | NBTD_ASSERT_PACKET(packet, src,
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| 62 | packet->additional[0].rr_class == NBT_QCLASS_IP);
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| 63 | NBTD_ASSERT_PACKET(packet, src,
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| 64 | packet->additional[0].rdata.netbios.length == 6);
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| 65 |
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| 66 | /* see if we have the requested name on this interface */
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| 67 | name = &packet->questions[0].name;
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| 68 |
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| 69 | iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
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| 70 | if (iname != NULL &&
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| 71 | !(name->type == NBT_NAME_LOGON || iname->nb_flags & NBT_NM_GROUP)) {
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| 72 | DEBUG(2,("Defending name %s on %s against %s\n",
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| 73 | nbt_name_string(packet, name),
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| 74 | iface->bcast_address, src->addr));
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| 75 | nbtd_name_registration_reply(nbtsock, packet, src, NBT_RCODE_ACT);
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| 76 | } else {
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| 77 | nbtd_winsserver_request(nbtsock, packet, src);
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| 78 | }
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| 79 | }
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