source/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 /*
  24   TODO: we should lower the timeout, and add retries for each name
  25 */
  26
  27 #include "includes.h"
  28 #include "libcli/composite/composite.h"
  29 #include "system/network.h"
  30 #include "netif/netif.h"
  31 #include "librpc/gen_ndr/ndr_nbt.h"
  32
  33 struct nbtlist_state {
  34         struct nbt_name name;
  35         struct nbt_name_socket *nbtsock;
  36         int num_queries;
  37         struct nbt_name_request **queries;
  38         struct nbt_name_query *io_queries;
  39         const char *reply_addr;
  40 };
  41
  42 /*
  43   handle events during nbtlist name resolution
  44 */
  45 static void nbtlist_handler(struct nbt_name_request *req)
  46 {
  47         struct composite_context *c = talloc_get_type(req->async.private,
  48                                                       struct composite_context);
  49         struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
  50         int i;
  51
  52         for (i=0;i<state->num_queries;i++) {
  53                 if (req == state->queries[i]) break;
  54         }
  55
  56         if (i == state->num_queries) {
  57                 /* not for us?! */
  58                 c->status = NT_STATUS_INTERNAL_ERROR;
  59                 c->state = COMPOSITE_STATE_ERROR;
  60                 goto done;
  61         }
  62
  63         c->status = nbt_name_query_recv(req, state, &state->io_queries[i]);
  64         if (!NT_STATUS_IS_OK(c->status)) {
  65                 c->state = COMPOSITE_STATE_ERROR;
  66
  67         } else {
  68                 if (state->io_queries[i].out.num_addrs < 1) {
  69                         c->state = COMPOSITE_STATE_ERROR;
  70                         c->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  71
  72                 } else {
  73                         struct nbt_name_query *q = &state->io_queries[i];
  74                         c->state = COMPOSITE_STATE_DONE;
  75                         /* favor a local address if possible */
  76                         state->reply_addr = NULL;
  77
  78                         for (i=0;i<q->out.num_addrs;i++) {
  79                                 if (iface_is_local(q->out.reply_addrs[i])) {
  80                                         state->reply_addr = talloc_steal(state,
  81                                                                          q->out.reply_addrs[i]);
  82                                         break;
  83                                 }
  84                         }
  85
  86                         if (state->reply_addr == NULL) {
  87                                 state->reply_addr = talloc_steal(state,
  88                                                                  q->out.reply_addrs[0]);
  89                         }
  90                 }
  91         }
  92
  93 done:
  94         talloc_free(state->nbtsock);
  95         if (c->async.fn) {
  96                 c->async.fn(c);
  97         }
  98 }
  99
 100 /*
 101   nbtlist name resolution method - async send
 102  */
 103 struct composite_context *resolve_name_nbtlist_send(struct nbt_name *name,
 104                                                    struct event_context *event_ctx,
 105                                                    const char **address_list,
 106                                                    BOOL broadcast,
 107                                                    BOOL wins_lookup)
 108 {
 109         struct composite_context *c;
 110         struct nbtlist_state *state;
 111         int i;
 112         NTSTATUS status;
 113
 114         c = talloc_zero(NULL, struct composite_context);
 115         if (c == NULL) goto failed;
 116
 117         state = talloc(c, struct nbtlist_state);
 118         if (state == NULL) goto failed;
 119
 120         status = nbt_name_dup(state, name, &state->name);
 121         if (!NT_STATUS_IS_OK(status)) goto failed;
 122
 123         state->name.name = strupper_talloc(state, state->name.name);
 124         if (state->name.name == NULL) goto failed;
 125         if (state->name.scope) {
 126                 state->name.scope = strupper_talloc(state, state->name.scope);
 127                 if (state->name.scope == NULL) goto failed;
 128         }
 129
 130         state->nbtsock = nbt_name_socket_init(state, event_ctx);
 131         if (state->nbtsock == NULL) goto failed;
 132
 133         /* count the address_list size */
 134         for (i=0;address_list[i];i++) /* noop */ ;
 135
 136         state->num_queries = i;
 137         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 138         if (!state->io_queries) goto failed;
 139
 140         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 141         if (!state->queries) goto failed;
 142
 143         for (i=0;i<state->num_queries;i++) {
 144                 state->io_queries[i].in.name        = state->name;
 145                 state->io_queries[i].in.dest_addr   = talloc_strdup(state->io_queries, address_list[i]);
 146                 if (!state->io_queries[i].in.dest_addr) goto failed;
 147
 148                 state->io_queries[i].in.broadcast   = broadcast;
 149                 state->io_queries[i].in.wins_lookup = wins_lookup;
 150                 state->io_queries[i].in.timeout     = lp_parm_int(-1, "nbt", "timeout", 1);
 151                 state->io_queries[i].in.retries     = 2;
 152
 153                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 154                 if (!state->queries[i]) goto failed;
 155
 156                 state->queries[i]->async.fn      = nbtlist_handler;
 157                 state->queries[i]->async.private = c;
 158         }
 159
 160         c->state = COMPOSITE_STATE_IN_PROGRESS;
 161         c->private_data = state;
 162         c->event_ctx = talloc_reference(c, state->nbtsock->event_ctx);
 163
 164         return c;
 165
 166 failed:
 167         talloc_free(c);
 168         return NULL;
 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(name, NULL, address_list,
 200                                                                broadcast, wins_lookup);
 201         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 202 }
 203