r5118: added support for node status replies in nbtd. nmblookup -S now works against...
[samba.git] / source / 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 2 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, write to the Free Software
20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include "includes.h"
24 #include "dlinklist.h"
25 #include "system/network.h"
26 #include "nbt_server/nbt_server.h"
27
28 /*
29   send a name query reply
30 */
31 static void nbt_name_query_reply(struct nbt_name_socket *nbtsock, 
32                                  struct nbt_name_packet *request_packet, 
33                                  const char *src_address, int src_port,
34                                  struct nbt_name *name, uint32_t ttl,
35                                  uint16_t nb_flags, const char *address)
36 {
37         struct nbt_name_packet *packet;
38
39         packet = talloc_zero(nbtsock, struct nbt_name_packet);
40         if (packet == NULL) return;
41
42         packet->name_trn_id = request_packet->name_trn_id;
43         packet->ancount = 1;
44         packet->operation = 
45                 NBT_FLAG_REPLY | 
46                 NBT_OPCODE_QUERY | 
47                 NBT_FLAG_AUTHORITIVE |
48                 NBT_FLAG_RECURSION_DESIRED |
49                 NBT_FLAG_RECURSION_AVAIL;
50
51         packet->answers = talloc_array(packet, struct nbt_res_rec, 1);
52         if (packet->answers == NULL) goto failed;
53
54         packet->answers[0].name     = *name;
55         packet->answers[0].rr_type  = NBT_QTYPE_NETBIOS;
56         packet->answers[0].rr_class = NBT_QCLASS_IP;
57         packet->answers[0].ttl      = ttl;
58         packet->answers[0].rdata.netbios.length = 6;
59         packet->answers[0].rdata.netbios.addresses = talloc_array(packet->answers,
60                                                             struct nbt_rdata_address, 1);
61         if (packet->answers[0].rdata.netbios.addresses == NULL) goto failed;
62         packet->answers[0].rdata.netbios.addresses[0].nb_flags = nb_flags;
63         packet->answers[0].rdata.netbios.addresses[0].ipaddr = htonl(inet_addr(address));
64
65         DEBUG(7,("Sending name query reply for %s<%02x> at %s to %s:%d\n", 
66                  name->name, name->type, src_address, address, src_port));
67         
68         nbt_name_reply_send(nbtsock, src_address, src_port, packet);
69
70 failed:
71         talloc_free(packet);
72 }
73
74
75 /*
76   answer a name query
77 */
78 void nbt_request_query(struct nbt_name_socket *nbtsock, 
79                        struct nbt_name_packet *packet, 
80                        const char *src_address, int src_port)
81 {
82         struct nbt_interface *iface;
83         struct nbt_iface_name *iname;
84         struct nbt_name *name;
85
86         /* see if its a node status query */
87         if (packet->qdcount == 1 &&
88             packet->questions[0].question_type == NBT_QTYPE_STATUS) {
89                 nbt_query_status(nbtsock, packet, src_address, src_port);
90                 return;
91         }
92
93         /* if its a WINS query then direct to our WINS server */
94         if ((packet->operation & NBT_FLAG_RECURSION_DESIRED) &&
95             !(packet->operation & NBT_FLAG_BROADCAST)) {
96                 nbt_query_wins(nbtsock, packet, src_address, src_port);
97                 return;
98         }
99
100         /* find the interface for this query */
101         iface = nbt_iface_find(nbtsock, src_address);
102
103         NBT_ASSERT_PACKET(packet, src_address, packet->qdcount == 1);
104         NBT_ASSERT_PACKET(packet, src_address, packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
105         NBT_ASSERT_PACKET(packet, src_address, packet->questions[0].question_class == NBT_QCLASS_IP);
106
107         /* see if we have the requested name on this interface */
108         name = &packet->questions[0].name;
109
110         iname = nbt_find_iname(iface, name, NBT_NM_ACTIVE);
111         if (iname == NULL) {
112                 DEBUG(7,("Query for %s<%02x> from %s - not found on %s\n",
113                          name->name, name->type, src_address, iface->ip_address));
114                 return;
115         }
116
117         nbt_name_query_reply(nbtsock, packet, src_address, src_port,
118                              &iname->name, iname->ttl, iname->nb_flags, 
119                              iface->ip_address);
120 }