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         struct interface *ifaces;
  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         load_interfaces(lp_interfaces(global_loadparm), &ifaces);
  80         state->reply_addr = NULL;
  81         for (i=0;i<q->out.num_addrs;i++) {
  82                 if (iface_is_local(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                                                     bool broadcast,
 105                                                     bool wins_lookup)
 106 {
 107         struct composite_context *c;
 108         struct nbtlist_state *state;
 109         int i;
 110
 111         c = composite_create(event_ctx, event_ctx);
 112         if (c == NULL) return NULL;
 113
 114         c->event_ctx = talloc_reference(c, event_ctx);
 115         if (composite_nomem(c->event_ctx, c)) return c;
 116
 117         state = talloc(c, struct nbtlist_state);
 118         if (composite_nomem(state, c)) return c;
 119         c->private_data = state;
 120
 121         c->status = nbt_name_dup(state, name, &state->name);
 122         if (!composite_is_ok(c)) return c;
 123
 124         state->name.name = strupper_talloc(state, state->name.name);
 125         if (composite_nomem(state->name.name, c)) return c;
 126         if (state->name.scope) {
 127                 state->name.scope = strupper_talloc(state, state->name.scope);
 128                 if (composite_nomem(state->name.scope, c)) return c;
 129         }
 130
 131         /*
 132          * we can't push long names on the wire,
 133          * so bail out here to give a useful error message
 134          */
 135         if (strlen(state->name.name) > 15) {
 136                 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
 137                 return c;
 138         }
 139
 140         state->nbtsock = nbt_name_socket_init(state, event_ctx);
 141         if (composite_nomem(state->nbtsock, c)) return c;
 142
 143         /* count the address_list size */
 144         for (i=0;address_list[i];i++) /* noop */ ;
 145
 146         state->num_queries = i;
 147         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 148         if (composite_nomem(state->io_queries, c)) return c;
 149
 150         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 151         if (composite_nomem(state->queries, c)) return c;
 152
 153         for (i=0;i<state->num_queries;i++) {
 154                 state->io_queries[i].in.name        = state->name;
 155                 state->io_queries[i].in.dest_addr   = talloc_strdup(state->io_queries, address_list[i]);
 156                 state->io_queries[i].in.dest_port   = lp_nbt_port(global_loadparm);
 157                 if (composite_nomem(state->io_queries[i].in.dest_addr, c)) return c;
 158
 159                 state->io_queries[i].in.broadcast   = broadcast;
 160                 state->io_queries[i].in.wins_lookup = wins_lookup;
 161                 state->io_queries[i].in.timeout     = lp_parm_int(global_loadparm, NULL, "nbt", "timeout", 1);
 162                 state->io_queries[i].in.retries     = 2;
 163
 164                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 165                 if (composite_nomem(state->queries[i], c)) return c;
 166
 167                 state->queries[i]->async.fn      = nbtlist_handler;
 168                 state->queries[i]->async.private = c;
 169         }
 170
 171         return c;
 172 }
 173
 174 /*
 175   nbt list of addresses name resolution method - recv side
 176  */
 177 NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
 178                                    TALLOC_CTX *mem_ctx, const char **reply_addr)
 179 {
 180         NTSTATUS status;
 181
 182         status = composite_wait(c);
 183
 184         if (NT_STATUS_IS_OK(status)) {
 185                 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
 186                 *reply_addr = talloc_steal(mem_ctx, state->reply_addr);
 187         }
 188
 189         talloc_free(c);
 190         return status;
 191 }
 192
 193 /*
 194   nbt list of addresses name resolution method - sync call
 195  */
 196 NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
 197                               TALLOC_CTX *mem_ctx,
 198                               const char **address_list,
 199                               bool broadcast, bool wins_lookup,
 200                               const char **reply_addr)
 201 {
 202         struct composite_context *c = resolve_name_nbtlist_send(mem_ctx, NULL, name, address_list,
 203                                                                 broadcast, wins_lookup);
 204         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 205 }
 206