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 #include "libcli/resolve/resolve.h"
  34
  35 struct nbtlist_state {
  36         struct nbt_name name;
  37         struct nbt_name_socket *nbtsock;
  38         int num_queries;
  39         struct nbt_name_request **queries;
  40         struct nbt_name_query *io_queries;
  41         const char *reply_addr;
  42         struct interface *ifaces;
  43 };
  44
  45 /*
  46   handle events during nbtlist name resolution
  47 */
  48 static void nbtlist_handler(struct nbt_name_request *req)
  49 {
  50         struct composite_context *c = talloc_get_type(req->async.private_data,
  51                                                       struct composite_context);
  52         struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
  53         struct nbt_name_query *q;
  54         int i;
  55
  56         for (i=0;i<state->num_queries;i++) {
  57                 if (req == state->queries[i]) break;
  58         }
  59
  60         if (i == state->num_queries) {
  61                 /* not for us?! */
  62                 composite_error(c, NT_STATUS_INTERNAL_ERROR);
  63                 return;
  64         }
  65
  66         q = &state->io_queries[i];
  67
  68         c->status = nbt_name_query_recv(req, state, q);
  69
  70         /* free the network resource directly */
  71         talloc_free(state->nbtsock);
  72         if (!composite_is_ok(c)) return;
  73
  74         if (state->io_queries[i].out.num_addrs < 1) {
  75                 composite_error(c, NT_STATUS_UNEXPECTED_NETWORK_ERROR);
  76                 return;
  77         }
  78
  79         /* favor a local address if possible */
  80         state->reply_addr = NULL;
  81         for (i=0;i<q->out.num_addrs;i++) {
  82                 if (iface_is_local(state->ifaces, q->out.reply_addrs[i])) {
  83                         state->reply_addr = talloc_steal(state,
  84                                                          q->out.reply_addrs[i]);
  85                         break;
  86                 }
  87         }
  88
  89         if (state->reply_addr == NULL) {
  90                 state->reply_addr = talloc_steal(state,
  91                                                  q->out.reply_addrs[0]);
  92         }
  93
  94         composite_done(c);
  95 }
  96
  97 /*
  98   nbtlist name resolution method - async send
  99  */
 100 struct composite_context *resolve_name_nbtlist_send(TALLOC_CTX *mem_ctx,
 101                                                     struct event_context *event_ctx,
 102                                                     struct nbt_name *name,
 103                                                     const char **address_list,
 104                                                     struct interface *ifaces,
 105                                                     uint16_t nbt_port,
 106                                                     int nbt_timeout,
 107                                                     bool broadcast,
 108                                                     bool wins_lookup)
 109 {
 110         struct composite_context *c;
 111         struct nbtlist_state *state;
 112         int i;
 113
 114         c = composite_create(mem_ctx, event_ctx);
 115         if (c == NULL) return NULL;
 116
 117         if (composite_nomem(c->event_ctx, c)) return c;
 118
 119         state = talloc(c, struct nbtlist_state);
 120         if (composite_nomem(state, c)) return c;
 121         c->private_data = state;
 122
 123         c->status = nbt_name_dup(state, name, &state->name);
 124         if (!composite_is_ok(c)) return c;
 125
 126         state->name.name = strupper_talloc(state, state->name.name);
 127         if (composite_nomem(state->name.name, c)) return c;
 128         if (state->name.scope) {
 129                 state->name.scope = strupper_talloc(state, state->name.scope);
 130                 if (composite_nomem(state->name.scope, c)) return c;
 131         }
 132
 133         state->ifaces = talloc_reference(state, ifaces);
 134
 135         /*
 136          * we can't push long names on the wire,
 137          * so bail out here to give a useful error message
 138          */
 139         if (strlen(state->name.name) > 15) {
 140                 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
 141                 return c;
 142         }
 143
 144         state->nbtsock = nbt_name_socket_init(state, event_ctx,
 145                                               lp_iconv_convenience(global_loadparm));
 146         if (composite_nomem(state->nbtsock, c)) return c;
 147
 148         /* count the address_list size */
 149         for (i=0;address_list[i];i++) /* noop */ ;
 150
 151         state->num_queries = i;
 152         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 153         if (composite_nomem(state->io_queries, c)) return c;
 154
 155         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 156         if (composite_nomem(state->queries, c)) return c;
 157
 158         for (i=0;i<state->num_queries;i++) {
 159                 state->io_queries[i].in.name        = state->name;
 160                 state->io_queries[i].in.dest_addr   = talloc_strdup(state->io_queries, address_list[i]);
 161                 state->io_queries[i].in.dest_port   = nbt_port;
 162                 if (composite_nomem(state->io_queries[i].in.dest_addr, c)) return c;
 163
 164                 state->io_queries[i].in.broadcast   = broadcast;
 165                 state->io_queries[i].in.wins_lookup = wins_lookup;
 166                 state->io_queries[i].in.timeout     = nbt_timeout;
 167                 state->io_queries[i].in.retries     = 2;
 168
 169                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 170                 if (composite_nomem(state->queries[i], c)) return c;
 171
 172                 state->queries[i]->async.fn      = nbtlist_handler;
 173                 state->queries[i]->async.private_data = c;
 174         }
 175
 176         return c;
 177 }
 178
 179 /*
 180   nbt list of addresses name resolution method - recv side
 181  */
 182 NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
 183                                    TALLOC_CTX *mem_ctx, const char **reply_addr)
 184 {
 185         NTSTATUS status;
 186
 187         status = composite_wait(c);
 188
 189         if (NT_STATUS_IS_OK(status)) {
 190                 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
 191                 *reply_addr = talloc_steal(mem_ctx, state->reply_addr);
 192         }
 193
 194         talloc_free(c);
 195         return status;
 196 }
 197
 198 /*
 199   nbt list of addresses name resolution method - sync call
 200  */
 201 NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
 202                               TALLOC_CTX *mem_ctx,
 203                               const char **address_list,
 204                               struct interface *ifaces,
 205                               uint16_t nbt_port,
 206                               int nbt_timeout,
 207                               bool broadcast, bool wins_lookup,
 208                               const char **reply_addr)
 209 {
 210         struct composite_context *c = resolve_name_nbtlist_send(mem_ctx, NULL,
 211                                                                 name, address_list,
 212                                                                 ifaces, nbt_port,
 213                                                                 nbt_timeout,
 214                                                                 broadcast, wins_lookup);
 215         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 216 }
 217