source4/libcli/resolve/nbtlist.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    nbt list of addresses name resolution module
   5
   6    Copyright (C) Andrew Tridgell 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 /*
  23   TODO: we should lower the timeout, and add retries for each name
  24 */
  25
  26 #include "includes.h"
  27 #include "libcli/composite/composite.h"
  28 #include "system/network.h"
  29 #include "lib/socket/netif.h"
  30 #include "librpc/gen_ndr/ndr_nbt.h"
  31 #include "libcli/nbt/libnbt.h"
  32 #include "param/param.h"
  33
  34 struct nbtlist_state {
  35         struct nbt_name name;
  36         struct nbt_name_socket *nbtsock;
  37         int num_queries;
  38         struct nbt_name_request **queries;
  39         struct nbt_name_query *io_queries;
  40         const char *reply_addr;
  41 };
  42
  43 /*
  44   handle events during nbtlist name resolution
  45 */
  46 static void nbtlist_handler(struct nbt_name_request *req)
  47 {
  48         struct composite_context *c = talloc_get_type(req->async.private,
  49                                                       struct composite_context);
  50         struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
  51         struct nbt_name_query *q;
  52         int i;
  53
  54         for (i=0;i<state->num_queries;i++) {
  55                 if (req == state->queries[i]) break;
  56         }
  57
  58         if (i == state->num_queries) {
  59                 /* not for us?! */
  60                 composite_error(c, NT_STATUS_INTERNAL_ERROR);
  61                 return;
  62         }
  63
  64         q = &state->io_queries[i];
  65
  66         c->status = nbt_name_query_recv(req, state, q);
  67
  68         /* free the network resource directly */
  69         talloc_free(state->nbtsock);
  70         if (!composite_is_ok(c)) return;
  71
  72         if (state->io_queries[i].out.num_addrs < 1) {
  73                 composite_error(c, NT_STATUS_UNEXPECTED_NETWORK_ERROR);
  74                 return;
  75         }
  76
  77         /* favor a local address if possible */
  78         state->reply_addr = NULL;
  79         for (i=0;i<q->out.num_addrs;i++) {
  80                 if (iface_is_local(q->out.reply_addrs[i])) {
  81                         state->reply_addr = talloc_steal(state,
  82                                                          q->out.reply_addrs[i]);
  83                         break;
  84                 }
  85         }
  86
  87         if (state->reply_addr == NULL) {
  88                 state->reply_addr = talloc_steal(state,
  89                                                  q->out.reply_addrs[0]);
  90         }
  91
  92         composite_done(c);
  93 }
  94
  95 /*
  96   nbtlist name resolution method - async send
  97  */
  98 struct composite_context *resolve_name_nbtlist_send(TALLOC_CTX *mem_ctx,
  99                                                     struct event_context *event_ctx,
 100                                                     struct nbt_name *name,
 101                                                     const char **address_list,
 102                                                     BOOL broadcast,
 103                                                     BOOL wins_lookup)
 104 {
 105         struct composite_context *c;
 106         struct nbtlist_state *state;
 107         int i;
 108
 109         c = composite_create(event_ctx, event_ctx);
 110         if (c == NULL) return NULL;
 111
 112         c->event_ctx = talloc_reference(c, event_ctx);
 113         if (composite_nomem(c->event_ctx, c)) return c;
 114
 115         state = talloc(c, struct nbtlist_state);
 116         if (composite_nomem(state, c)) return c;
 117         c->private_data = state;
 118
 119         c->status = nbt_name_dup(state, name, &state->name);
 120         if (!composite_is_ok(c)) return c;
 121
 122         state->name.name = strupper_talloc(state, state->name.name);
 123         if (composite_nomem(state->name.name, c)) return c;
 124         if (state->name.scope) {
 125                 state->name.scope = strupper_talloc(state, state->name.scope);
 126                 if (composite_nomem(state->name.scope, c)) return c;
 127         }
 128
 129         /*
 130          * we can't push long names on the wire,
 131          * so bail out here to give a useful error message
 132          */
 133         if (strlen(state->name.name) > 15) {
 134                 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
 135                 return c;
 136         }
 137
 138         state->nbtsock = nbt_name_socket_init(state, event_ctx);
 139         if (composite_nomem(state->nbtsock, c)) return c;
 140
 141         /* count the address_list size */
 142         for (i=0;address_list[i];i++) /* noop */ ;
 143
 144         state->num_queries = i;
 145         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 146         if (composite_nomem(state->io_queries, c)) return c;
 147
 148         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 149         if (composite_nomem(state->queries, c)) return c;
 150
 151         for (i=0;i<state->num_queries;i++) {
 152                 state->io_queries[i].in.name        = state->name;
 153                 state->io_queries[i].in.dest_addr   = talloc_strdup(state->io_queries, address_list[i]);
 154                 if (composite_nomem(state->io_queries[i].in.dest_addr, c)) return c;
 155
 156                 state->io_queries[i].in.broadcast   = broadcast;
 157                 state->io_queries[i].in.wins_lookup = wins_lookup;
 158                 state->io_queries[i].in.timeout     = lp_parm_int(global_loadparm, NULL, "nbt", "timeout", 1);
 159                 state->io_queries[i].in.retries     = 2;
 160
 161                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 162                 if (composite_nomem(state->queries[i], c)) return c;
 163
 164                 state->queries[i]->async.fn      = nbtlist_handler;
 165                 state->queries[i]->async.private = c;
 166         }
 167
 168         return c;
 169 }
 170
 171 /*
 172   nbt list of addresses name resolution method - recv side
 173  */
 174 NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
 175                                    TALLOC_CTX *mem_ctx, const char **reply_addr)
 176 {
 177         NTSTATUS status;
 178
 179         status = composite_wait(c);
 180
 181         if (NT_STATUS_IS_OK(status)) {
 182                 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
 183                 *reply_addr = talloc_steal(mem_ctx, state->reply_addr);
 184         }
 185
 186         talloc_free(c);
 187         return status;
 188 }
 189
 190 /*
 191   nbt list of addresses name resolution method - sync call
 192  */
 193 NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
 194                               TALLOC_CTX *mem_ctx,
 195                               const char **address_list,
 196                               BOOL broadcast, BOOL wins_lookup,
 197                               const char **reply_addr)
 198 {
 199         struct composite_context *c = resolve_name_nbtlist_send(mem_ctx, NULL, name, address_list,
 200                                                                 broadcast, wins_lookup);
 201         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 202 }
 203