Line data    Source code

       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 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 "nbt_server/wins/winsserver.h"
      27             : #include "librpc/gen_ndr/ndr_nbt.h"
      28             : #include "lib/socket/socket.h"
      29             : 
      30             : 
      31             : /*
      32             :   defend our registered names against registration or name refresh
      33             :   requests
      34             : */
      35        5489 : void nbtd_request_defense(struct nbt_name_socket *nbtsock, 
      36             :                           struct nbt_name_packet *packet, 
      37             :                           struct socket_address *src)
      38             : {
      39          66 :         struct nbtd_iface_name *iname;
      40          66 :         struct nbt_name *name;
      41        5489 :         struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
      42             :                                                        struct nbtd_interface);
      43             : 
      44             :         /*
      45             :          * if the packet comes from one of our interfaces
      46             :          * it must be our winsclient trying to reach the winsserver
      47             :          */
      48        5489 :         if (nbtd_self_packet(nbtsock, packet, src)) {
      49        1501 :                 nbtd_winsserver_request(nbtsock, packet, src);
      50        1501 :                 return;
      51             :         }
      52             : 
      53        3988 :         NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
      54        3988 :         NBTD_ASSERT_PACKET(packet, src, packet->arcount == 1);
      55        3988 :         NBTD_ASSERT_PACKET(packet, src, 
      56             :                            packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
      57        3988 :         NBTD_ASSERT_PACKET(packet, src, 
      58             :                            packet->questions[0].question_class == NBT_QCLASS_IP);
      59        3988 :         NBTD_ASSERT_PACKET(packet, src, 
      60             :                           packet->additional[0].rr_type == NBT_QTYPE_NETBIOS);
      61        3988 :         NBTD_ASSERT_PACKET(packet, src, 
      62             :                           packet->additional[0].rr_class == NBT_QCLASS_IP);
      63        3988 :         NBTD_ASSERT_PACKET(packet, src, 
      64             :                           packet->additional[0].rdata.netbios.length == 6);
      65             : 
      66             :         /* see if we have the requested name on this interface */
      67        3988 :         name = &packet->questions[0].name;
      68             : 
      69        3988 :         iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
      70        3988 :         if (iname != NULL && 
      71         251 :             !(name->type == NBT_NAME_LOGON || iname->nb_flags & NBT_NM_GROUP)) {
      72           9 :                 DEBUG(2,("Defending name %s on %s against %s\n",
      73             :                          nbt_name_string(packet, name), 
      74             :                          iface->bcast_address, src->addr));
      75           9 :                 nbtd_name_registration_reply(nbtsock, packet, src, NBT_RCODE_ACT);
      76             :         } else {
      77        3979 :                 nbtd_winsserver_request(nbtsock, packet, src);
      78             :         }
      79             : }