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         const char *default_domain;
  37 };
  38
  39 struct resolve_file_state {
  40         struct socket_address **addrs;
  41         char **names;
  42 };
  43
  44 /**
  45   broadcast name resolution method - async send
  46  */
  47 /*
  48   general name resolution - async send
  49  */
  50 struct composite_context *resolve_name_file_send(TALLOC_CTX *mem_ctx,
  51                                                   struct tevent_context *event_ctx,
  52                                                   void *userdata, uint32_t flags,
  53                                                   uint16_t port,
  54                                                   struct nbt_name *name)
  55 {
  56         struct composite_context *c;
  57         struct resolve_file_data *data = talloc_get_type_abort(userdata, struct resolve_file_data);
  58         struct resolve_file_state *state;
  59         struct sockaddr_storage *resolved_iplist;
  60         int resolved_count, i;
  61         char *dns_name;
  62
  63         bool srv_lookup = (flags & RESOLVE_NAME_FLAG_DNS_SRV);
  64
  65         if (event_ctx == NULL) {
  66                 return NULL;
  67         }
  68
  69         c = composite_create(mem_ctx, event_ctx);
  70         if (c == NULL) return NULL;
  71
  72         /* This isn't an NBT layer resolver */
  73         if (flags & RESOLVE_NAME_FLAG_FORCE_NBT) {
  74                 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
  75                 return c;
  76         }
  77
  78         if (composite_nomem(c->event_ctx, c)) return c;
  79
  80         state = talloc_zero(c, struct resolve_file_state);
  81         if (composite_nomem(state, c)) return c;
  82         c->private_data = state;
  83
  84         dns_name = name->name;
  85         if (strchr(dns_name, '.') == NULL) {
  86                 dns_name = talloc_asprintf(state, "%s.%s", dns_name, data->default_domain);
  87         }
  88
  89         c->status = resolve_dns_hosts_file_as_sockaddr(data->lookup_file, dns_name,
  90                                                        srv_lookup, state, &resolved_iplist, &resolved_count);
  91         if (!composite_is_ok(c)) return c;
  92
  93         for (i=0; i < resolved_count; i++) {
  94                 state->addrs = talloc_realloc(state, state->addrs, struct socket_address *, i+2);
  95                 if (composite_nomem(state->addrs, c)) return c;
  96
  97                 if (!(flags & RESOLVE_NAME_FLAG_OVERWRITE_PORT)) {
  98                         set_sockaddr_port((struct sockaddr *)&resolved_iplist[i], port);
  99                 }
 100
 101                 state->addrs[i] = socket_address_from_sockaddr(state->addrs, (struct sockaddr *)&resolved_iplist[i], sizeof(resolved_iplist[i]));
 102                 if (composite_nomem(state->addrs[i], c)) return c;
 103
 104                 state->addrs[i+1] = NULL;
 105
 106
 107                 state->names = talloc_realloc(state, state->names, char *, i+2);
 108                 if (composite_nomem(state->addrs, c)) return c;
 109
 110                 state->names[i] = talloc_strdup(state->names, dns_name);
 111                 if (composite_nomem(state->names[i], c)) return c;
 112
 113                 state->names[i+1] = NULL;
 114
 115                 i++;
 116         }
 117
 118         composite_done(c);
 119         return c;
 120 }
 121
 122 /*
 123   general name resolution method - recv side
 124  */
 125 NTSTATUS resolve_name_file_recv(struct composite_context *c,
 126                                  TALLOC_CTX *mem_ctx,
 127                                  struct socket_address ***addrs,
 128                                  char ***names)
 129 {
 130         NTSTATUS status;
 131
 132         status = composite_wait(c);
 133
 134         if (NT_STATUS_IS_OK(status)) {
 135                 struct resolve_file_state *state = talloc_get_type(c->private_data, struct resolve_file_state);
 136                 *addrs = talloc_steal(mem_ctx, state->addrs);
 137                 if (names) {
 138                         *names = talloc_steal(mem_ctx, state->names);
 139                 }
 140         }
 141
 142         talloc_free(c);
 143         return status;
 144 }
 145
 146
 147 bool resolve_context_add_file_method(struct resolve_context *ctx, const char *lookup_file, const char *default_domain)
 148 {
 149         struct resolve_file_data *data = talloc(ctx, struct resolve_file_data);
 150         data->lookup_file    = talloc_strdup(data, lookup_file);
 151         data->default_domain = talloc_strdup(data, default_domain);
 152         return resolve_context_add_method(ctx, resolve_name_file_send, resolve_name_file_recv, data);
 153 }
 154
 155 bool resolve_context_add_file_method_lp(struct resolve_context *ctx, struct loadparm_context *lp_ctx)
 156 {
 157         return resolve_context_add_file_method(ctx,
 158                                                lpcfg_parm_string(lp_ctx, NULL, "resolv", "host file"),
 159                                                lpcfg_dnsdomain(lp_ctx));
 160 }