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 event_context *event_ctx,
  40                                                   void *userdata,
  41                                                   struct nbt_name *name)
  42 {
  43         int num_interfaces;
  44         const char **address_list;
  45         struct composite_context *c;
  46         int i, count=0;
  47         struct resolve_bcast_data *data = talloc_get_type(userdata, struct resolve_bcast_data);
  48
  49         num_interfaces = iface_count(data->ifaces);
  50
  51         address_list = talloc_array(mem_ctx, const char *, num_interfaces+1);
  52         if (address_list == NULL) return NULL;
  53
  54         for (i=0;i<num_interfaces;i++) {
  55                 const char *bcast = iface_n_bcast(data->ifaces, i);
  56                 if (bcast == NULL) continue;
  57                 address_list[count] = talloc_strdup(address_list, bcast);
  58                 if (address_list[count] == NULL) {
  59                         talloc_free(address_list);
  60                         return NULL;
  61                 }
  62                 count++;
  63         }
  64         address_list[count] = NULL;
  65
  66         c = resolve_name_nbtlist_send(mem_ctx, event_ctx, name, address_list, data->ifaces, data->nbt_port, data->nbt_timeout, true, false);
  67         talloc_free(address_list);
  68
  69         return c;
  70 }
  71
  72 /*
  73   broadcast name resolution method - recv side
  74  */
  75 NTSTATUS resolve_name_bcast_recv(struct composite_context *c,
  76                                  TALLOC_CTX *mem_ctx, const char **reply_addr)
  77 {
  78         NTSTATUS status = resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
  79         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
  80                 /* this makes much more sense for a bcast name resolution
  81                    timeout */
  82                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
  83         }
  84         return status;
  85 }
  86
  87 /*
  88   broadcast name resolution method - sync call
  89  */
  90 NTSTATUS resolve_name_bcast(struct nbt_name *name,
  91                             TALLOC_CTX *mem_ctx,
  92                             struct interface *ifaces,
  93                             uint16_t nbt_port,
  94                             int nbt_timeout,
  95                             const char **reply_addr)
  96 {
  97         struct resolve_bcast_data *data = talloc(mem_ctx, struct resolve_bcast_data);
  98         struct composite_context *c;
  99         data->ifaces = talloc_reference(data, ifaces);
 100         data->nbt_port = nbt_port;
 101         data->nbt_timeout = nbt_timeout;
 102
 103         c = resolve_name_bcast_send(mem_ctx, NULL, data, name);
 104         return resolve_name_bcast_recv(c, mem_ctx, reply_addr);
 105 }
 106
 107 bool resolve_context_add_bcast_method(struct resolve_context *ctx, struct interface *ifaces, uint16_t nbt_port, int nbt_timeout)
 108 {
 109         struct resolve_bcast_data *data = talloc(ctx, struct resolve_bcast_data);
 110         data->ifaces = ifaces;
 111         data->nbt_port = nbt_port;
 112         data->nbt_timeout = nbt_timeout;
 113         return resolve_context_add_method(ctx, resolve_name_bcast_send, resolve_name_bcast_recv, data);
 114 }
 115
 116 bool resolve_context_add_bcast_method_lp(struct resolve_context *ctx, struct loadparm_context *lp_ctx)
 117 {
 118         struct interface *ifaces;
 119         load_interfaces(ctx, lp_interfaces(lp_ctx), &ifaces);
 120         return resolve_context_add_bcast_method(ctx, ifaces, lp_nbt_port(lp_ctx), lp_parm_int(lp_ctx, NULL, "nbt", "timeout", 1));
 121 }