dfd742db5a1c60c43891e05f7009bde0fac82479
[garming/samba-autobuild/.git] / source4 / nbt_server / query.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    answer name queries
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 "smbd/service_task.h"
28 #include "librpc/gen_ndr/ndr_nbt.h"
29 #include "lib/socket/socket.h"
30 #include "param/param.h"
31
32 /*
33   answer a name query
34 */
35 void nbtd_request_query(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, 
42                                                        struct nbtd_interface);
43
44         /* see if its a node status query */
45         if (packet->qdcount == 1 &&
46             packet->questions[0].question_type == NBT_QTYPE_STATUS) {
47                 nbtd_query_status(nbtsock, packet, src);
48                 return;
49         }
50
51         NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
52         NBTD_ASSERT_PACKET(packet, src, 
53                            packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
54         NBTD_ASSERT_PACKET(packet, src, 
55                            packet->questions[0].question_class == NBT_QCLASS_IP);
56
57         /* see if we have the requested name on this interface */
58         name = &packet->questions[0].name;
59
60         iname = nbtd_find_iname(iface, name, 0);
61         if (iname == NULL) {
62                 /* don't send negative replies to broadcast queries */
63                 if (packet->operation & NBT_FLAG_BROADCAST) {
64                         return;
65                 }
66
67                 if (packet->operation & NBT_FLAG_RECURSION_DESIRED) {
68                         nbtd_winsserver_request(nbtsock, packet, src);
69                         return;
70                 }
71
72                 /* otherwise send a negative reply */
73                 nbtd_negative_name_query_reply(nbtsock, packet, src);
74                 return;
75         }
76
77         /*
78          * normally we should forward all queries with the
79          * recursion desired flag to the wins server, but this
80          * breaks are winsclient code, when doing mhomed registrations
81          */
82         if (!(packet->operation & NBT_FLAG_BROADCAST) &&
83            (packet->operation & NBT_FLAG_RECURSION_DESIRED) &&
84            (iname->nb_flags & NBT_NM_GROUP) &&
85            lp_wins_support(iface->nbtsrv->task->lp_ctx)) {
86                 nbtd_winsserver_request(nbtsock, packet, src);
87                 return;
88         }
89
90         /* if the name is not yet active and its a broadcast query then
91            ignore it for now */
92         if (!(iname->nb_flags & NBT_NM_ACTIVE) && 
93             (packet->operation & NBT_FLAG_BROADCAST)) {
94                 DEBUG(7,("Query for %s from %s - name not active yet on %s\n",
95                          nbt_name_string(packet, name), src->addr, iface->ip_address));
96                 return;
97         }
98
99         nbtd_name_query_reply(nbtsock, packet, src,
100                               &iname->name, iname->ttl, iname->nb_flags, 
101                               nbtd_address_list(iface, packet));
102 }