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    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 struct composite_context *resolve_name_bcast_send(TALLOC_CTX *mem_ctx,
  39                                                   struct tevent_context *event_ctx,
  40                                                   void *userdata, uint32_t flags,
  41                                                   uint16_t port,
  42                                                   struct nbt_name *name)
  43 {
  44         int num_interfaces;
  45         const char **address_list;
  46         struct composite_context *c;
  47         int i, count=0;
  48         struct resolve_bcast_data *data = talloc_get_type(userdata, struct resolve_bcast_data);
  49
  50         num_interfaces = iface_list_count(data->ifaces);
  51
  52         address_list = talloc_array(mem_ctx, const char *, num_interfaces+1);
  53         if (address_list == NULL) return NULL;
  54
  55         for (i=0;i<num_interfaces;i++) {
  56                 bool ipv4 = iface_list_n_is_v4(data->ifaces, i);
  57                 const char *bcast;
  58
  59                 if (!ipv4) {
  60                         continue;
  61                 }
  62
  63                 bcast = iface_list_n_bcast(data->ifaces, i);
  64                 if (bcast == NULL) {
  65                         continue;
  66                 }
  67
  68                 address_list[count] = talloc_strdup(address_list, bcast);
  69                 if (address_list[count] == NULL) {
  70                         talloc_free(address_list);
  71                         return NULL;
  72                 }
  73                 count++;
  74         }
  75         address_list[count] = NULL;
  76
  77         c = resolve_name_nbtlist_send(mem_ctx, event_ctx, flags, port, name,
  78                                       address_list, data->ifaces, data->nbt_port,
  79                                       data->nbt_timeout, true, false);
  80         talloc_free(address_list);
  81
  82         return c;
  83 }
  84
  85 /*
  86   broadcast name resolution method - recv side
  87  */
  88 NTSTATUS resolve_name_bcast_recv(struct composite_context *c,
  89                                  TALLOC_CTX *mem_ctx,
  90                                  struct socket_address ***addrs,
  91                                  char ***names)
  92 {
  93         NTSTATUS status = resolve_name_nbtlist_recv(c, mem_ctx, addrs, names);
  94         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
  95                 /* this makes much more sense for a bcast name resolution
  96                    timeout */
  97                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
  98         }
  99         return status;
 100 }
 101
 102 bool resolve_context_add_bcast_method(struct resolve_context *ctx, struct interface *ifaces, uint16_t nbt_port, int nbt_timeout)
 103 {
 104         struct resolve_bcast_data *data = talloc(ctx, struct resolve_bcast_data);
 105         data->ifaces = ifaces;
 106         data->nbt_port = nbt_port;
 107         data->nbt_timeout = nbt_timeout;
 108         return resolve_context_add_method(ctx, resolve_name_bcast_send, resolve_name_bcast_recv, data);
 109 }
 110
 111 bool resolve_context_add_bcast_method_lp(struct resolve_context *ctx, struct loadparm_context *lp_ctx)
 112 {
 113         struct interface *ifaces;
 114         load_interface_list(ctx, lp_ctx, &ifaces);
 115         return resolve_context_add_bcast_method(ctx, ifaces, lpcfg_nbt_port(lp_ctx), lpcfg_parm_int(lp_ctx, NULL, "nbt", "timeout", 1));
 116 }