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DEFINITIONS
This source file includes following definitions.
- nbtd_node_status_reply
- nbtd_query_status
1 /*
2 Unix SMB/CIFS implementation.
3
4 answer node status 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 "lib/socket/socket.h"
27 #include "librpc/gen_ndr/ndr_nbt.h"
28
29 /*
30 send a name status reply
31 */
32 static void nbtd_node_status_reply(struct nbt_name_socket *nbtsock,
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33 struct nbt_name_packet *request_packet,
34 struct socket_address *src,
35 struct nbt_name *name,
36 struct nbtd_interface *iface)
37 {
38 struct nbt_name_packet *packet;
39 uint32_t name_count;
40 struct nbtd_iface_name *iname;
41 struct nbtd_server *nbtsrv = iface->nbtsrv;
42
43 /* work out how many names to send */
44 name_count = 0;
45 for (iname=iface->names;iname;iname=iname->next) {
46 if ((iname->nb_flags & NBT_NM_ACTIVE) &&
47 strcmp(iname->name.name, "*") != 0) {
48 name_count++;
49 }
50 }
51
52 packet = talloc_zero(nbtsock, struct nbt_name_packet);
53 if (packet == NULL) return;
54
55 packet->name_trn_id = request_packet->name_trn_id;
56 packet->ancount = 1;
57 packet->operation = NBT_OPCODE_QUERY | NBT_FLAG_REPLY | NBT_FLAG_AUTHORITIVE;
58
59 packet->answers = talloc_array(packet, struct nbt_res_rec, 1);
60 if (packet->answers == NULL) goto failed;
61
62 packet->answers[0].name = *name;
63 packet->answers[0].rr_type = NBT_QTYPE_STATUS;
64 packet->answers[0].rr_class = NBT_QCLASS_IP;
65 packet->answers[0].ttl = 0;
66 packet->answers[0].rdata.status.num_names = name_count;
67 packet->answers[0].rdata.status.names = talloc_array(packet->answers,
68 struct nbt_status_name, name_count);
69 if (packet->answers[0].rdata.status.names == NULL) goto failed;
70
71 name_count = 0;
72 for (iname=iface->names;iname;iname=iname->next) {
73 if ((iname->nb_flags & NBT_NM_ACTIVE) &&
74 strcmp(iname->name.name, "*") != 0) {
75 struct nbt_status_name *n = &packet->answers[0].rdata.status.names[name_count];
76 n->name = talloc_asprintf(packet->answers, "%-15s", iname->name.name);
77 if (n->name == NULL) goto failed;
78 n->type = iname->name.type;
79 n->nb_flags = iname->nb_flags;
80 name_count++;
81 }
82 }
83 /* we deliberately don't fill in the statistics structure as
84 it could lead to giving attackers too much information */
85 ZERO_STRUCT(packet->answers[0].rdata.status.statistics);
86
87 DEBUG(7,("Sending node status reply for %s to %s:%d\n",
88 nbt_name_string(packet, name), src->addr, src->port));
89
90 nbtsrv->stats.total_sent++;
91 nbt_name_reply_send(nbtsock, src, packet);
92
93 failed:
94 talloc_free(packet);
95 }
96
97
98 /*
99 answer a node status query
100 */
101 void nbtd_query_status(struct nbt_name_socket *nbtsock,
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102 struct nbt_name_packet *packet,
103 struct socket_address *src)
104 {
105 struct nbt_name *name;
106 struct nbtd_iface_name *iname;
107 struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
108 struct nbtd_interface);
109
110 NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
111 NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_type == NBT_QTYPE_STATUS);
112 NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_class == NBT_QCLASS_IP);
113
114 /* see if we have the requested name on this interface */
115 name = &packet->questions[0].name;
116
117 iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
118 if (iname == NULL) {
119 DEBUG(7,("Node status query for %s from %s - not found on %s\n",
120 nbt_name_string(packet, name), src->addr, iface->ip_address));
121 return;
122 }
123
124 nbtd_node_status_reply(nbtsock, packet, src,
125 &iname->name, iface);
126 }