Line data    Source code

       1             : /* 
       2             :    Unix SMB/CIFS implementation.
       3             : 
       4             :    broadcast name resolution module
       5             : 
       6             :    Copyright (C) Andrew Tridgell 2005
       7             :    Copyright (C) Jelmer Vernooij 2007
       8             :    
       9             :    This program is free software; you can redistribute it and/or modify
      10             :    it under the terms of the GNU General Public License as published by
      11             :    the Free Software Foundation; either version 3 of the License, or
      12             :    (at your option) any later version.
      13             :    
      14             :    This program is distributed in the hope that it will be useful,
      15             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17             :    GNU General Public License for more details.
      18             :    
      19             :    You should have received a copy of the GNU General Public License
      20             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      21             : */
      22             : 
      23             : #include "includes.h"
      24             : #include "libcli/resolve/resolve.h"
      25             : #include "system/network.h"
      26             : #include "lib/socket/netif.h"
      27             : #include "param/param.h"
      28             : 
      29             : struct resolve_bcast_data {
      30             :         struct interface *ifaces;
      31             :         uint16_t nbt_port;
      32             :         int nbt_timeout;
      33             : };
      34             : 
      35             : /**
      36             :   broadcast name resolution method - async send
      37             :  */
      38        4512 : static struct composite_context *resolve_name_bcast_send(
      39             :         TALLOC_CTX *mem_ctx,
      40             :         struct tevent_context *event_ctx,
      41             :         void *userdata, uint32_t flags,
      42             :         uint16_t port,
      43             :         struct nbt_name *name)
      44             : {
      45           0 :         int num_interfaces;
      46           0 :         const char **address_list;
      47           0 :         struct composite_context *c;
      48        4512 :         int i, count=0;
      49        4512 :         struct resolve_bcast_data *data = talloc_get_type(userdata, struct resolve_bcast_data);
      50             : 
      51        4512 :         num_interfaces = iface_list_count(data->ifaces);
      52             : 
      53        4512 :         address_list = talloc_array(mem_ctx, const char *, num_interfaces+1);
      54        4512 :         if (address_list == NULL) return NULL;
      55             : 
      56       13621 :         for (i=0;i<num_interfaces;i++) {
      57        9109 :                 bool ipv4 = iface_list_n_is_v4(data->ifaces, i);
      58           0 :                 const char *bcast;
      59             : 
      60        9109 :                 if (!ipv4) {
      61        4512 :                         continue;
      62             :                 }
      63             : 
      64        4597 :                 bcast = iface_list_n_bcast(data->ifaces, i);
      65        4597 :                 if (bcast == NULL) {
      66           0 :                         continue;
      67             :                 }
      68             : 
      69        4597 :                 address_list[count] = talloc_strdup(address_list, bcast);
      70        4597 :                 if (address_list[count] == NULL) {
      71           0 :                         talloc_free(address_list);
      72           0 :                         return NULL;
      73             :                 }
      74        4597 :                 count++;
      75             :         }
      76        4512 :         address_list[count] = NULL;
      77             : 
      78        4512 :         c = resolve_name_nbtlist_send(mem_ctx, event_ctx, flags, port, name,
      79        4512 :                                       address_list, data->ifaces, data->nbt_port,
      80             :                                       data->nbt_timeout, true, false);
      81        4512 :         talloc_free(address_list);
      82             : 
      83        4512 :         return c;       
      84             : }
      85             : 
      86             : /*
      87             :   broadcast name resolution method - recv side
      88             :  */
      89        4512 : static NTSTATUS resolve_name_bcast_recv(struct composite_context *c,
      90             :                                         TALLOC_CTX *mem_ctx,
      91             :                                         struct socket_address ***addrs,
      92             :                                         char ***names)
      93             : {
      94        4512 :         NTSTATUS status = resolve_name_nbtlist_recv(c, mem_ctx, addrs, names);
      95        4512 :         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
      96             :                 /* this makes much more sense for a bcast name resolution
      97             :                    timeout */
      98           1 :                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
      99             :         }
     100        4512 :         return status;
     101             : }
     102             : 
     103       67003 : bool resolve_context_add_bcast_method(struct resolve_context *ctx, struct interface *ifaces, uint16_t nbt_port, int nbt_timeout)
     104             : {
     105       67003 :         struct resolve_bcast_data *data = talloc(ctx, struct resolve_bcast_data);
     106       67003 :         data->ifaces = ifaces;
     107       67003 :         data->nbt_port = nbt_port;
     108       67003 :         data->nbt_timeout = nbt_timeout;
     109       67003 :         return resolve_context_add_method(ctx, resolve_name_bcast_send, resolve_name_bcast_recv, data);
     110             : }
     111             : 
     112       67003 : bool resolve_context_add_bcast_method_lp(struct resolve_context *ctx, struct loadparm_context *lp_ctx)
     113             : {
     114        1322 :         struct interface *ifaces;
     115       67003 :         load_interface_list(ctx, lp_ctx, &ifaces);
     116       67003 :         return resolve_context_add_bcast_method(ctx, ifaces, lpcfg_nbt_port(lp_ctx), lpcfg_parm_int(lp_ctx, NULL, "nbt", "timeout", 1));
     117             : }