source4/libcli/resolve/lmhosts.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    broadcast name resolution module
   5
   6    Copyright (C) Andrew Tridgell 1994-1998,2005
   7    Copyright (C) Jeremy Allison 2007
   8    Copyright (C) Jelmer Vernooij 2007
   9    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009-2014
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "libcli/composite/composite.h"
  26 #include "libcli/resolve/resolve.h"
  27 #include "lib/socket/socket.h"
  28 #include "system/network.h"
  29 #include "lib/socket/netif.h"
  30 #include "param/param.h"
  31 #include "lib/util/util_net.h"
  32 #include "libcli/nbt/libnbt.h"
  33 #include "dynconfig.h"
  34
  35 struct resolve_lmhosts_state {
  36         struct socket_address **addrs;
  37         char **names;
  38 };
  39
  40 /**
  41   broadcast name resolution method - async send
  42  */
  43 /*
  44   general name resolution - async send
  45  */
  46 struct composite_context *resolve_name_lmhosts_send(TALLOC_CTX *mem_ctx,
  47                                                   struct tevent_context *event_ctx,
  48                                                   void *userdata, uint32_t flags,
  49                                                   uint16_t port,
  50                                                   struct nbt_name *name)
  51 {
  52         struct composite_context *c;
  53         struct resolve_lmhosts_state *state;
  54         struct sockaddr_storage *resolved_iplist;
  55         int resolved_count, i;
  56
  57         if (event_ctx == NULL) {
  58                 return NULL;
  59         }
  60
  61         c = composite_create(mem_ctx, event_ctx);
  62         if (c == NULL) return NULL;
  63
  64         if (composite_nomem(c->event_ctx, c)) return c;
  65
  66         state = talloc_zero(c, struct resolve_lmhosts_state);
  67         if (composite_nomem(state, c)) return c;
  68         c->private_data = state;
  69
  70         c->status = resolve_lmhosts_file_as_sockaddr(dyn_LMHOSTSFILE, name->name, name->type,
  71                                                      state, &resolved_iplist, &resolved_count);
  72         if (!composite_is_ok(c)) return c;
  73
  74         for (i=0; i < resolved_count; i++) {
  75                 state->addrs = talloc_realloc(state, state->addrs, struct socket_address *, i+2);
  76                 if (composite_nomem(state->addrs, c)) return c;
  77
  78                 set_sockaddr_port((struct sockaddr *)&resolved_iplist[i], port);
  79
  80                 state->addrs[i] = socket_address_from_sockaddr(state->addrs, (struct sockaddr *)&resolved_iplist[i], sizeof(resolved_iplist[i]));
  81                 if (composite_nomem(state->addrs[i], c)) return c;
  82
  83                 state->addrs[i+1] = NULL;
  84
  85
  86                 state->names = talloc_realloc(state, state->names, char *, i+2);
  87                 if (composite_nomem(state->addrs, c)) return c;
  88
  89                 state->names[i] = talloc_strdup(state->names, name->name);
  90                 if (composite_nomem(state->names[i], c)) return c;
  91
  92                 state->names[i+1] = NULL;
  93
  94                 i++;
  95         }
  96
  97         composite_done(c);
  98         return c;
  99 }
 100
 101 /*
 102   general name resolution method - recv side
 103  */
 104 NTSTATUS resolve_name_lmhosts_recv(struct composite_context *c,
 105                                  TALLOC_CTX *mem_ctx,
 106                                  struct socket_address ***addrs,
 107                                  char ***names)
 108 {
 109         NTSTATUS status;
 110
 111         status = composite_wait(c);
 112
 113         if (NT_STATUS_IS_OK(status)) {
 114                 struct resolve_lmhosts_state *state = talloc_get_type(c->private_data, struct resolve_lmhosts_state);
 115                 *addrs = talloc_steal(mem_ctx, state->addrs);
 116                 if (names) {
 117                         *names = talloc_steal(mem_ctx, state->names);
 118                 }
 119         }
 120
 121         talloc_free(c);
 122         return status;
 123 }
 124
 125
 126 bool resolve_context_add_lmhosts_method(struct resolve_context *ctx)
 127 {
 128         return resolve_context_add_method(ctx, resolve_name_lmhosts_send, resolve_name_lmhosts_recv, NULL);
 129 }