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 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         int num_interfaces;
  46         const char **address_list;
  47         struct composite_context *c;
  48         int i, count=0;
  49         struct resolve_bcast_data *data = talloc_get_type(userdata, struct resolve_bcast_data);
  50
  51         num_interfaces = iface_list_count(data->ifaces);
  52
  53         address_list = talloc_array(mem_ctx, const char *, num_interfaces+1);
  54         if (address_list == NULL) return NULL;
  55
  56         for (i=0;i<num_interfaces;i++) {
  57                 bool ipv4 = iface_list_n_is_v4(data->ifaces, i);
  58                 const char *bcast;
  59
  60                 if (!ipv4) {
  61                         continue;
  62                 }
  63
  64                 bcast = iface_list_n_bcast(data->ifaces, i);
  65                 if (bcast == NULL) {
  66                         continue;
  67                 }
  68
  69                 address_list[count] = talloc_strdup(address_list, bcast);
  70                 if (address_list[count] == NULL) {
  71                         talloc_free(address_list);
  72                         return NULL;
  73                 }
  74                 count++;
  75         }
  76         address_list[count] = NULL;
  77
  78         c = resolve_name_nbtlist_send(mem_ctx, event_ctx, flags, port, name,
  79                                       address_list, data->ifaces, data->nbt_port,
  80                                       data->nbt_timeout, true, false);
  81         talloc_free(address_list);
  82
  83         return c;
  84 }
  85
  86 /*
  87   broadcast name resolution method - recv side
  88  */
  89 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         NTSTATUS status = resolve_name_nbtlist_recv(c, mem_ctx, addrs, names);
  95         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
  96                 /* this makes much more sense for a bcast name resolution
  97                    timeout */
  98                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
  99         }
 100         return status;
 101 }
 102
 103 bool resolve_context_add_bcast_method(struct resolve_context *ctx, struct interface *ifaces, uint16_t nbt_port, int nbt_timeout)
 104 {
 105         struct resolve_bcast_data *data = talloc(ctx, struct resolve_bcast_data);
 106         data->ifaces = ifaces;
 107         data->nbt_port = nbt_port;
 108         data->nbt_timeout = nbt_timeout;
 109         return resolve_context_add_method(ctx, resolve_name_bcast_send, resolve_name_bcast_recv, data);
 110 }
 111
 112 bool resolve_context_add_bcast_method_lp(struct resolve_context *ctx, struct loadparm_context *lp_ctx)
 113 {
 114         struct interface *ifaces;
 115         load_interface_list(ctx, lp_ctx, &ifaces);
 116         return resolve_context_add_bcast_method(ctx, ifaces, lpcfg_nbt_port(lp_ctx), lpcfg_parm_int(lp_ctx, NULL, "nbt", "timeout", 1));
 117 }