source4/libcli/resolve/file.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> 2009-2010
  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
  34 struct resolve_file_data {
  35         const char *lookup_file;
  36 };
  37
  38 struct resolve_file_state {
  39         struct socket_address **addrs;
  40         char **names;
  41 };
  42
  43 /**
  44   broadcast name resolution method - async send
  45  */
  46 /*
  47   general name resolution - async send
  48  */
  49 struct composite_context *resolve_name_file_send(TALLOC_CTX *mem_ctx,
  50                                                   struct tevent_context *event_ctx,
  51                                                   void *userdata, uint32_t flags,
  52                                                   uint16_t port,
  53                                                   struct nbt_name *name)
  54 {
  55         struct composite_context *c;
  56         struct resolve_file_data *data = talloc_get_type_abort(userdata, struct resolve_file_data);
  57         struct resolve_file_state *state;
  58         struct sockaddr_storage *resolved_iplist;
  59         int resolved_count, i;
  60
  61         bool srv_lookup = (flags & RESOLVE_NAME_FLAG_DNS_SRV);
  62
  63         if (event_ctx == NULL) {
  64                 return NULL;
  65         }
  66
  67         c = composite_create(mem_ctx, event_ctx);
  68         if (c == NULL) return NULL;
  69
  70         /* This isn't an NBT layer resolver */
  71         if (flags & RESOLVE_NAME_FLAG_FORCE_NBT || name->type != NBT_NAME_SERVER) {
  72                 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
  73                 return c;
  74         }
  75
  76         if (composite_nomem(c->event_ctx, c)) return c;
  77
  78         state = talloc_zero(c, struct resolve_file_state);
  79         if (composite_nomem(state, c)) return c;
  80         c->private_data = state;
  81
  82
  83         c->status = resolve_dns_hosts_file_as_sockaddr(data->lookup_file, name->name, srv_lookup, state, &resolved_iplist, &resolved_count);
  84         if (!composite_is_ok(c)) return c;
  85
  86         for (i=0; i < resolved_count; i++) {
  87                 state->addrs = talloc_realloc(state, state->addrs, struct socket_address *, i+2);
  88                 if (composite_nomem(state->addrs, c)) return c;
  89
  90                 if (!(flags & RESOLVE_NAME_FLAG_OVERWRITE_PORT)) {
  91                         set_sockaddr_port((struct sockaddr *)&resolved_iplist[i], port);
  92                 }
  93
  94                 state->addrs[i] = socket_address_from_sockaddr(state->addrs, (struct sockaddr *)&resolved_iplist[i], sizeof(resolved_iplist[i]));
  95                 if (composite_nomem(state->addrs[i], c)) return c;
  96
  97                 state->addrs[i+1] = NULL;
  98
  99
 100                 state->names = talloc_realloc(state, state->names, char *, i+2);
 101                 if (composite_nomem(state->addrs, c)) return c;
 102
 103                 state->names[i] = talloc_strdup(state->names, name->name);
 104                 if (composite_nomem(state->names[i], c)) return c;
 105
 106                 state->names[i+1] = NULL;
 107
 108                 i++;
 109         }
 110
 111         composite_done(c);
 112         return c;
 113 }
 114
 115 /*
 116   general name resolution method - recv side
 117  */
 118 NTSTATUS resolve_name_file_recv(struct composite_context *c,
 119                                  TALLOC_CTX *mem_ctx,
 120                                  struct socket_address ***addrs,
 121                                  char ***names)
 122 {
 123         NTSTATUS status;
 124
 125         status = composite_wait(c);
 126
 127         if (NT_STATUS_IS_OK(status)) {
 128                 struct resolve_file_state *state = talloc_get_type(c->private_data, struct resolve_file_state);
 129                 *addrs = talloc_steal(mem_ctx, state->addrs);
 130                 if (names) {
 131                         *names = talloc_steal(mem_ctx, state->names);
 132                 }
 133         }
 134
 135         talloc_free(c);
 136         return status;
 137 }
 138
 139
 140 bool resolve_context_add_file_method(struct resolve_context *ctx, const char *lookup_file)
 141 {
 142         struct resolve_file_data *data = talloc(ctx, struct resolve_file_data);
 143         data->lookup_file = lookup_file;
 144         return resolve_context_add_method(ctx, resolve_name_file_send, resolve_name_file_recv, data);
 145 }
 146
 147 bool resolve_context_add_file_method_lp(struct resolve_context *ctx, struct loadparm_context *lp_ctx)
 148 {
 149         return resolve_context_add_file_method(ctx, lpcfg_parm_string(lp_ctx, NULL, "resolv", "host file"));
 150 }