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