1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/*
Unix SMB/CIFS implementation.
answer name queries
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"
#include "param/param.h"
/*
answer a name query
*/
void nbtd_request_query(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,
struct nbtd_interface);
/* see if its a node status query */
if (packet->qdcount == 1 &&
packet->questions[0].question_type == NBT_QTYPE_STATUS) {
nbtd_query_status(nbtsock, packet, src);
return;
}
NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 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);
/* see if we have the requested name on this interface */
name = &packet->questions[0].name;
iname = nbtd_find_iname(iface, name, 0);
if (iname == NULL) {
/* don't send negative replies to broadcast queries */
if (packet->operation & NBT_FLAG_BROADCAST) {
return;
}
if (packet->operation & NBT_FLAG_RECURSION_DESIRED) {
nbtd_winsserver_request(nbtsock, packet, src);
return;
}
/* otherwise send a negative reply */
nbtd_negative_name_query_reply(nbtsock, packet, src);
return;
}
/*
* normally we should forward all queries with the
* recursion desired flag to the wins server, but this
* breaks are winsclient code, when doing mhomed registrations
*/
if (!(packet->operation & NBT_FLAG_BROADCAST) &&
(packet->operation & NBT_FLAG_RECURSION_DESIRED) &&
(iname->nb_flags & NBT_NM_GROUP) &&
lp_wins_support(global_loadparm)) {
nbtd_winsserver_request(nbtsock, packet, src);
return;
}
/* if the name is not yet active and its a broadcast query then
ignore it for now */
if (!(iname->nb_flags & NBT_NM_ACTIVE) &&
(packet->operation & NBT_FLAG_BROADCAST)) {
DEBUG(7,("Query for %s from %s - name not active yet on %s\n",
nbt_name_string(packet, name), src->addr, iface->ip_address));
return;
}
nbtd_name_query_reply(nbtsock, packet, src,
&iname->name, iname->ttl, iname->nb_flags,
nbtd_address_list(iface, packet));
}
|
