Line data    Source code

       1             : /* 
       2             :    Unix SMB/CIFS implementation.
       3             : 
       4             :    answer name 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 "nbt_server/wins/winsserver.h"
      27             : #include "samba/service_task.h"
      28             : #include "librpc/gen_ndr/ndr_nbt.h"
      29             : #include "lib/socket/socket.h"
      30             : #include "param/param.h"
      31             : 
      32             : /*
      33             :   answer a name query
      34             : */
      35        6645 : void nbtd_request_query(struct nbt_name_socket *nbtsock, 
      36             :                         struct nbt_name_packet *packet, 
      37             :                         struct socket_address *src)
      38             : {
      39          40 :         struct nbtd_iface_name *iname;
      40          40 :         struct nbt_name *name;
      41        6645 :         struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
      42             :                                                        struct nbtd_interface);
      43             : 
      44             :         /* see if its a node status query */
      45        6645 :         if (packet->qdcount == 1 &&
      46        6645 :             packet->questions[0].question_type == NBT_QTYPE_STATUS) {
      47          19 :                 nbtd_query_status(nbtsock, packet, src);
      48          19 :                 return;
      49             :         }
      50             : 
      51        6626 :         NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
      52        6626 :         NBTD_ASSERT_PACKET(packet, src, 
      53             :                            packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
      54        6626 :         NBTD_ASSERT_PACKET(packet, src, 
      55             :                            packet->questions[0].question_class == NBT_QCLASS_IP);
      56             : 
      57             :         /* see if we have the requested name on this interface */
      58        6626 :         name = &packet->questions[0].name;
      59             : 
      60        6626 :         iname = nbtd_find_iname(iface, name, 0);
      61        6626 :         if (iname == NULL) {
      62             :                 /* don't send negative replies to broadcast queries */
      63        5373 :                 if (packet->operation & NBT_FLAG_BROADCAST) {
      64        5305 :                         return;
      65             :                 }
      66             : 
      67          58 :                 if (packet->operation & NBT_FLAG_RECURSION_DESIRED) {
      68          56 :                         nbtd_winsserver_request(nbtsock, packet, src);
      69          56 :                         return;
      70             :                 }
      71             : 
      72             :                 /* otherwise send a negative reply */
      73           2 :                 nbtd_negative_name_query_reply(nbtsock, packet, src);
      74           2 :                 return;
      75             :         }
      76             : 
      77             :         /*
      78             :          * normally we should forward all queries with the
      79             :          * recursion desired flag to the wins server, but this
      80             :          * breaks are winsclient code, when doing mhomed registrations
      81             :          */
      82        1253 :         if (!(packet->operation & NBT_FLAG_BROADCAST) &&
      83         439 :            (packet->operation & NBT_FLAG_RECURSION_DESIRED) &&
      84           0 :            (iname->nb_flags & NBT_NM_GROUP) &&
      85           0 :            lpcfg_we_are_a_wins_server(iface->nbtsrv->task->lp_ctx)) {
      86           0 :                 nbtd_winsserver_request(nbtsock, packet, src);
      87           0 :                 return;
      88             :         }
      89             : 
      90             :         /* if the name is not yet active and its a broadcast query then
      91             :            ignore it for now */
      92        1253 :         if (!(iname->nb_flags & NBT_NM_ACTIVE) && 
      93         195 :             (packet->operation & NBT_FLAG_BROADCAST)) {
      94         195 :                 DEBUG(7,("Query for %s from %s - name not active yet on %s\n",
      95             :                          nbt_name_string(packet, name), src->addr, iface->ip_address));
      96         195 :                 return;
      97             :         }
      98             : 
      99        1058 :         nbtd_name_query_reply(nbtsock, packet, src,
     100        1058 :                               &iname->name, iname->ttl, iname->nb_flags, 
     101             :                               nbtd_address_list(iface, packet));
     102             : }