source4/nbt_server/defense.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    defend our names against name registration requests
   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 #include "nbt_server/wins/winsserver.h"
  28
  29
  30 /*
  31   defend our registered names against registration or name refresh
  32   requests
  33 */
  34 void nbtd_request_defense(struct nbt_name_socket *nbtsock,
  35                           struct nbt_name_packet *packet,
  36                           const struct nbt_peer_socket *src)
  37 {
  38         struct nbtd_iface_name *iname;
  39         struct nbt_name *name;
  40         struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
  41                                                        struct nbtd_interface);
  42
  43         NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
  44         NBTD_ASSERT_PACKET(packet, src, packet->arcount == 1);
  45         NBTD_ASSERT_PACKET(packet, src,
  46                            packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
  47         NBTD_ASSERT_PACKET(packet, src,
  48                            packet->questions[0].question_class == NBT_QCLASS_IP);
  49         NBTD_ASSERT_PACKET(packet, src,
  50                           packet->additional[0].rr_type == NBT_QTYPE_NETBIOS);
  51         NBTD_ASSERT_PACKET(packet, src,
  52                           packet->additional[0].rr_class == NBT_QCLASS_IP);
  53         NBTD_ASSERT_PACKET(packet, src,
  54                           packet->additional[0].rdata.netbios.length == 6);
  55
  56         /* see if we have the requested name on this interface */
  57         name = &packet->questions[0].name;
  58
  59         iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
  60         if (iname != NULL &&
  61             !(name->type == NBT_NAME_LOGON || iname->nb_flags & NBT_NM_GROUP)) {
  62                 DEBUG(2,("Defending name %s on %s against %s\n",
  63                          nbt_name_string(packet, name),
  64                          iface->bcast_address, src->addr));
  65                 nbtd_name_registration_reply(nbtsock, packet, src, NBT_RCODE_ACT);
  66         } else {
  67                 nbtd_winsserver_request(nbtsock, packet, src);
  68         }
  69 }