source4/libcli/resolve/bcast.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    broadcast name resolution module
   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 "libcli/resolve/resolve.h"
  24 #include "system/network.h"
  25 #include "lib/socket/netif.h"
  26 #include "param/param.h"
  27
  28 /**
  29   broadcast name resolution method - async send
  30  */
  31 struct composite_context *resolve_name_bcast_send(TALLOC_CTX *mem_ctx,
  32                                                   struct event_context *event_ctx,
  33                                                   void *userdata,
  34                                                   struct nbt_name *name)
  35 {
  36         int num_interfaces;
  37         const char **address_list;
  38         struct composite_context *c;
  39         int i, count=0;
  40         struct interface *ifaces = userdata;
  41
  42         num_interfaces = iface_count(ifaces);
  43
  44         address_list = talloc_array(mem_ctx, const char *, num_interfaces+1);
  45         if (address_list == NULL) return NULL;
  46
  47         for (i=0;i<num_interfaces;i++) {
  48                 const char *bcast = iface_n_bcast(ifaces, i);
  49                 if (bcast == NULL) continue;
  50                 address_list[count] = talloc_strdup(address_list, bcast);
  51                 if (address_list[count] == NULL) {
  52                         talloc_free(address_list);
  53                         return NULL;
  54                 }
  55                 count++;
  56         }
  57         address_list[count] = NULL;
  58
  59         c = resolve_name_nbtlist_send(mem_ctx, event_ctx, name, address_list, true, false);
  60         talloc_free(address_list);
  61
  62         return c;
  63 }
  64
  65 /*
  66   broadcast name resolution method - recv side
  67  */
  68 NTSTATUS resolve_name_bcast_recv(struct composite_context *c,
  69                                  TALLOC_CTX *mem_ctx, const char **reply_addr)
  70 {
  71         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
  72 }
  73
  74 /*
  75   broadcast name resolution method - sync call
  76  */
  77 NTSTATUS resolve_name_bcast(struct nbt_name *name,
  78                             TALLOC_CTX *mem_ctx,
  79                             struct interface *ifaces,
  80                             const char **reply_addr)
  81 {
  82         struct composite_context *c = resolve_name_bcast_send(mem_ctx, NULL, ifaces, name);
  83         return resolve_name_bcast_recv(c, mem_ctx, reply_addr);
  84 }
  85
  86 bool resolve_context_add_bcast_method(struct resolve_context *ctx, struct loadparm_context *lp_ctx)
  87 {
  88         struct interface *ifaces;
  89         load_interfaces(ctx, lp_interfaces(lp_ctx), &ifaces);
  90         return resolve_context_add_method(ctx, resolve_name_bcast_send, resolve_name_bcast_recv,
  91                                           ifaces);
  92 }