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         struct interface *ifaces;
  42 };
  43
  44 /*
  45   handle events during nbtlist name resolution
  46 */
  47 static void nbtlist_handler(struct nbt_name_request *req)
  48 {
  49         struct composite_context *c = talloc_get_type(req->async.private_data,
  50                                                       struct composite_context);
  51         struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
  52         struct nbt_name_query *q;
  53         int i;
  54
  55         for (i=0;i<state->num_queries;i++) {
  56                 if (req == state->queries[i]) break;
  57         }
  58
  59         if (i == state->num_queries) {
  60                 /* not for us?! */
  61                 composite_error(c, NT_STATUS_INTERNAL_ERROR);
  62                 return;
  63         }
  64
  65         q = &state->io_queries[i];
  66
  67         c->status = nbt_name_query_recv(req, state, q);
  68
  69         /* free the network resource directly */
  70         talloc_free(state->nbtsock);
  71         if (!composite_is_ok(c)) return;
  72
  73         if (state->io_queries[i].out.num_addrs < 1) {
  74                 composite_error(c, NT_STATUS_UNEXPECTED_NETWORK_ERROR);
  75                 return;
  76         }
  77
  78         /* favor a local address if possible */
  79         state->reply_addr = NULL;
  80         for (i=0;i<q->out.num_addrs;i++) {
  81                 if (iface_is_local(state->ifaces, q->out.reply_addrs[i])) {
  82                         state->reply_addr = talloc_steal(state,
  83                                                          q->out.reply_addrs[i]);
  84                         break;
  85                 }
  86         }
  87
  88         if (state->reply_addr == NULL) {
  89                 state->reply_addr = talloc_steal(state,
  90                                                  q->out.reply_addrs[0]);
  91         }
  92
  93         composite_done(c);
  94 }
  95
  96 /*
  97   nbtlist name resolution method - async send
  98  */
  99 struct composite_context *resolve_name_nbtlist_send(TALLOC_CTX *mem_ctx,
 100                                                     struct event_context *event_ctx,
 101                                                     struct nbt_name *name,
 102                                                     const char **address_list,
 103                                                     struct interface *ifaces,
 104                                                     uint16_t nbt_port,
 105                                                     int nbt_timeout,
 106                                                     bool broadcast,
 107                                                     bool wins_lookup)
 108 {
 109         struct composite_context *c;
 110         struct nbtlist_state *state;
 111         int i;
 112
 113         c = composite_create(mem_ctx, event_ctx);
 114         if (c == NULL) return NULL;
 115
 116         if (composite_nomem(c->event_ctx, c)) return c;
 117
 118         state = talloc(c, struct nbtlist_state);
 119         if (composite_nomem(state, c)) return c;
 120         c->private_data = state;
 121
 122         c->status = nbt_name_dup(state, name, &state->name);
 123         if (!composite_is_ok(c)) return c;
 124
 125         state->name.name = strupper_talloc(state, state->name.name);
 126         if (composite_nomem(state->name.name, c)) return c;
 127         if (state->name.scope) {
 128                 state->name.scope = strupper_talloc(state, state->name.scope);
 129                 if (composite_nomem(state->name.scope, c)) return c;
 130         }
 131
 132         state->ifaces = talloc_reference(state, ifaces);
 133
 134         /*
 135          * we can't push long names on the wire,
 136          * so bail out here to give a useful error message
 137          */
 138         if (strlen(state->name.name) > 15) {
 139                 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
 140                 return c;
 141         }
 142
 143         state->nbtsock = nbt_name_socket_init(state, event_ctx,
 144                                               lp_iconv_convenience(global_loadparm));
 145         if (composite_nomem(state->nbtsock, c)) return c;
 146
 147         /* count the address_list size */
 148         for (i=0;address_list[i];i++) /* noop */ ;
 149
 150         state->num_queries = i;
 151         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 152         if (composite_nomem(state->io_queries, c)) return c;
 153
 154         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 155         if (composite_nomem(state->queries, c)) return c;
 156
 157         for (i=0;i<state->num_queries;i++) {
 158                 state->io_queries[i].in.name        = state->name;
 159                 state->io_queries[i].in.dest_addr   = talloc_strdup(state->io_queries, address_list[i]);
 160                 state->io_queries[i].in.dest_port   = nbt_port;
 161                 if (composite_nomem(state->io_queries[i].in.dest_addr, c)) return c;
 162
 163                 state->io_queries[i].in.broadcast   = broadcast;
 164                 state->io_queries[i].in.wins_lookup = wins_lookup;
 165                 state->io_queries[i].in.timeout     = nbt_timeout;
 166                 state->io_queries[i].in.retries     = 2;
 167
 168                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 169                 if (composite_nomem(state->queries[i], c)) return c;
 170
 171                 state->queries[i]->async.fn      = nbtlist_handler;
 172                 state->queries[i]->async.private_data = c;
 173         }
 174
 175         return c;
 176 }
 177
 178 /*
 179   nbt list of addresses name resolution method - recv side
 180  */
 181 NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
 182                                    TALLOC_CTX *mem_ctx, const char **reply_addr)
 183 {
 184         NTSTATUS status;
 185
 186         status = composite_wait(c);
 187
 188         if (NT_STATUS_IS_OK(status)) {
 189                 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
 190                 *reply_addr = talloc_steal(mem_ctx, state->reply_addr);
 191         }
 192
 193         talloc_free(c);
 194         return status;
 195 }
 196
 197 /*
 198   nbt list of addresses name resolution method - sync call
 199  */
 200 NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
 201                               TALLOC_CTX *mem_ctx,
 202                               const char **address_list,
 203                               struct interface *ifaces,
 204                               uint16_t nbt_port,
 205                               int nbt_timeout,
 206                               bool broadcast, bool wins_lookup,
 207                               const char **reply_addr)
 208 {
 209         struct composite_context *c = resolve_name_nbtlist_send(mem_ctx, NULL,
 210                                                                 name, address_list,
 211                                                                 ifaces, nbt_port,
 212                                                                 nbt_timeout,
 213                                                                 broadcast, wins_lookup);
 214         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 215 }
 216