ldb: Free memory when repacking database
[garming/samba-autobuild/.git] / source4 / nbt_server / defense.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    defend our names against name registration requests
5
6    Copyright (C) Andrew Tridgell        2005
7    
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 3 of the License, or
11    (at your option) any later version.
12    
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17    
18    You should have received a copy of the GNU General Public License
19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "../lib/util/dlinklist.h"
24 #include "system/network.h"
25 #include "nbt_server/nbt_server.h"
26 #include "nbt_server/wins/winsserver.h"
27 #include "librpc/gen_ndr/ndr_nbt.h"
28 #include "lib/socket/socket.h"
29
30
31 /*
32   defend our registered names against registration or name refresh
33   requests
34 */
35 void nbtd_request_defense(struct nbt_name_socket *nbtsock, 
36                           struct nbt_name_packet *packet, 
37                           struct socket_address *src)
38 {
39         struct nbtd_iface_name *iname;
40         struct nbt_name *name;
41         struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
42                                                        struct nbtd_interface);
43
44         /*
45          * if the packet comes from one of our interfaces
46          * it must be our winsclient trying to reach the winsserver
47          */
48         if (nbtd_self_packet(nbtsock, packet, src)) {
49                 nbtd_winsserver_request(nbtsock, packet, src);
50                 return;
51         }
52
53         NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
54         NBTD_ASSERT_PACKET(packet, src, packet->arcount == 1);
55         NBTD_ASSERT_PACKET(packet, src, 
56                            packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
57         NBTD_ASSERT_PACKET(packet, src, 
58                            packet->questions[0].question_class == NBT_QCLASS_IP);
59         NBTD_ASSERT_PACKET(packet, src, 
60                           packet->additional[0].rr_type == NBT_QTYPE_NETBIOS);
61         NBTD_ASSERT_PACKET(packet, src, 
62                           packet->additional[0].rr_class == NBT_QCLASS_IP);
63         NBTD_ASSERT_PACKET(packet, src, 
64                           packet->additional[0].rdata.netbios.length == 6);
65
66         /* see if we have the requested name on this interface */
67         name = &packet->questions[0].name;
68
69         iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
70         if (iname != NULL && 
71             !(name->type == NBT_NAME_LOGON || iname->nb_flags & NBT_NM_GROUP)) {
72                 DEBUG(2,("Defending name %s on %s against %s\n",
73                          nbt_name_string(packet, name), 
74                          iface->bcast_address, src->addr));
75                 nbtd_name_registration_reply(nbtsock, packet, src, NBT_RCODE_ACT);
76         } else {
77                 nbtd_winsserver_request(nbtsock, packet, src);
78         }
79 }