s4-nbt: use private_data instead of private.
[garming/samba-autobuild/.git] / source4 / nbt_server / nodestatus.c
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, 
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, 
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 }