source4/nbt_server/wins/wins_dns_proxy.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    wins server dns proxy
   5
   6    Copyright (C) Stefan Metzmacher      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 "nbt_server/nbt_server.h"
  25 #include "nbt_server/wins/winsdb.h"
  26 #include "nbt_server/wins/winsserver.h"
  27 #include "system/time.h"
  28 #include "libcli/composite/composite.h"
  29 #include "smbd/service_task.h"
  30 #include "libcli/resolve/resolve.h"
  31
  32 struct wins_dns_proxy_state {
  33         struct nbt_name_socket *nbtsock;
  34         struct nbt_name_packet *packet;
  35         struct socket_address *src;
  36 };
  37
  38 static void nbtd_wins_dns_proxy_handler(struct composite_context *creq)
  39 {
  40         NTSTATUS status;
  41         struct wins_dns_proxy_state *s = talloc_get_type(creq->async.private_data,
  42                                                          struct wins_dns_proxy_state);
  43         struct nbt_name *name = &s->packet->questions[0].name;
  44         const char *address;
  45         const char **addresses;
  46         uint16_t nb_flags = 0; /* TODO: ... */
  47
  48         status = resolve_name_recv(creq, s->packet, &address);
  49         if (!NT_STATUS_IS_OK(status)) {
  50                 goto notfound;
  51         }
  52
  53         addresses = str_list_add(NULL, address);
  54         talloc_steal(s->packet, addresses);
  55         if (!addresses) goto notfound;
  56
  57         nbtd_name_query_reply(s->nbtsock, s->packet, s->src, name,
  58                               0, nb_flags, addresses);
  59         return;
  60 notfound:
  61         nbtd_negative_name_query_reply(s->nbtsock, s->packet, s->src);
  62 }
  63
  64 /*
  65   dns proxy query a name
  66 */
  67 void nbtd_wins_dns_proxy_query(struct nbt_name_socket *nbtsock,
  68                                struct nbt_name_packet *packet,
  69                                struct socket_address *src)
  70 {
  71         struct nbt_name *name = &packet->questions[0].name;
  72         struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
  73                                                        struct nbtd_interface);
  74         struct wins_dns_proxy_state *s;
  75         struct composite_context *creq;
  76         const char *methods[] = {
  77                 "host",
  78                 NULL
  79         };
  80
  81         s = talloc(nbtsock, struct wins_dns_proxy_state);
  82         if (!s) goto failed;
  83         s->nbtsock      = nbtsock;
  84         s->packet       = talloc_steal(s, packet);
  85         s->src          = src;
  86         if (!talloc_reference(s, src)) {
  87                 goto failed;
  88         }
  89
  90         creq = resolve_name_send(name, iface->nbtsrv->task->event_ctx, methods);
  91         if (!creq) goto failed;
  92
  93         creq->async.fn          = nbtd_wins_dns_proxy_handler;
  94         creq->async.private_data= s;
  95         return;
  96 failed:
  97         nbtd_negative_name_query_reply(nbtsock, packet, src);
  98 }