source/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 "lib/util/dlinklist.h"
  25 #include "system/network.h"
  26 #include "nbt_server/nbt_server.h"
  27 #include "lib/socket/socket.h"
  28 #include "librpc/gen_ndr/ndr_nbt.h"
  29
  30 /*
  31   send a name status reply
  32 */
  33 static void nbtd_node_status_reply(struct nbt_name_socket *nbtsock,
  34                                    struct nbt_name_packet *request_packet,
  35                                    struct socket_address *src,
  36                                    struct nbt_name *name,
  37                                    struct nbtd_interface *iface)
  38 {
  39         struct nbt_name_packet *packet;
  40         uint32_t name_count;
  41         struct nbtd_iface_name *iname;
  42         struct nbtd_server *nbtsrv = iface->nbtsrv;
  43
  44         /* work out how many names to send */
  45         name_count = 0;
  46         for (iname=iface->names;iname;iname=iname->next) {
  47                 if ((iname->nb_flags & NBT_NM_ACTIVE) &&
  48                     strcmp(iname->name.name, "*") != 0) {
  49                         name_count++;
  50                 }
  51         }
  52
  53         packet = talloc_zero(nbtsock, struct nbt_name_packet);
  54         if (packet == NULL) return;
  55
  56         packet->name_trn_id = request_packet->name_trn_id;
  57         packet->ancount = 1;
  58         packet->operation = NBT_OPCODE_QUERY | NBT_FLAG_REPLY | NBT_FLAG_AUTHORITIVE;
  59
  60         packet->answers = talloc_array(packet, struct nbt_res_rec, 1);
  61         if (packet->answers == NULL) goto failed;
  62
  63         packet->answers[0].name     = *name;
  64         packet->answers[0].rr_type  = NBT_QTYPE_STATUS;
  65         packet->answers[0].rr_class = NBT_QCLASS_IP;
  66         packet->answers[0].ttl      = 0;
  67         packet->answers[0].rdata.status.num_names = name_count;
  68         packet->answers[0].rdata.status.names = talloc_array(packet->answers,
  69                                                              struct nbt_status_name, name_count);
  70         if (packet->answers[0].rdata.status.names == NULL) goto failed;
  71
  72         name_count = 0;
  73         for (iname=iface->names;iname;iname=iname->next) {
  74                 if ((iname->nb_flags & NBT_NM_ACTIVE) &&
  75                     strcmp(iname->name.name, "*") != 0) {
  76                         struct nbt_status_name *n = &packet->answers[0].rdata.status.names[name_count];
  77                         n->name = talloc_asprintf(packet->answers, "%-15s", iname->name.name);
  78                         if (n->name == NULL) goto failed;
  79                         n->type     = iname->name.type;
  80                         n->nb_flags = iname->nb_flags;
  81                         name_count++;
  82                 }
  83         }
  84         /* we deliberately don't fill in the statistics structure as
  85            it could lead to giving attackers too much information */
  86         ZERO_STRUCT(packet->answers[0].rdata.status.statistics);
  87
  88         DEBUG(7,("Sending node status reply for %s to %s:%d\n",
  89                  nbt_name_string(packet, name), src->addr, src->port));
  90
  91         nbtsrv->stats.total_sent++;
  92         nbt_name_reply_send(nbtsock, src, packet);
  93
  94 failed:
  95         talloc_free(packet);
  96 }
  97
  98
  99 /*
 100   answer a node status query
 101 */
 102 void nbtd_query_status(struct nbt_name_socket *nbtsock,
 103                        struct nbt_name_packet *packet,
 104                        struct socket_address *src)
 105 {
 106         struct nbt_name *name;
 107         struct nbtd_iface_name *iname;
 108         struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
 109                                                        struct nbtd_interface);
 110
 111         NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
 112         NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_type == NBT_QTYPE_STATUS);
 113         NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_class == NBT_QCLASS_IP);
 114
 115         /* see if we have the requested name on this interface */
 116         name = &packet->questions[0].name;
 117
 118         iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
 119         if (iname == NULL) {
 120                 DEBUG(7,("Node status query for %s from %s - not found on %s\n",
 121                          nbt_name_string(packet, name), src->addr, iface->ip_address));
 122                 return;
 123         }
 124
 125         nbtd_node_status_reply(nbtsock, packet, src,
 126                                &iname->name, iface);
 127 }