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 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/raw/libcliraw.h"
  29 #include "libcli/nbt/libnbt.h"
  30 #include "libcli/composite/composite.h"
  31
  32 struct nbtlist_state {
  33         struct nbt_name name;
  34         struct nbt_name_socket *nbtsock;
  35         int num_queries;
  36         struct nbt_name_request **queries;
  37         struct nbt_name_query *io_queries;
  38         const char *reply_addr;
  39 };
  40
  41 /*
  42   handle events during nbtlist name resolution
  43 */
  44 static void nbtlist_handler(struct nbt_name_request *req)
  45 {
  46         struct smbcli_composite *c = talloc_get_type(req->async.private,
  47                                                      struct smbcli_composite);
  48         struct nbtlist_state *state = talloc_get_type(c->private, struct nbtlist_state);
  49         int i;
  50
  51         for (i=0;i<state->num_queries;i++) {
  52                 if (req == state->queries[i]) break;
  53         }
  54         if (i == state->num_queries) {
  55                 /* not for us?! */
  56                 c->status = NT_STATUS_INTERNAL_ERROR;
  57                 c->state = SMBCLI_REQUEST_ERROR;
  58                 goto done;
  59         }
  60
  61         c->status = nbt_name_query_recv(req, state, &state->io_queries[i]);
  62         if (!NT_STATUS_IS_OK(c->status)) {
  63                 c->state = SMBCLI_REQUEST_ERROR;
  64         } else {
  65                 if (state->io_queries[i].out.num_addrs < 1) {
  66                         c->state = SMBCLI_REQUEST_ERROR;
  67                         c->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  68                 } else {
  69                         c->state = SMBCLI_REQUEST_DONE;
  70                         state->reply_addr = talloc_steal(state, state->io_queries[i].out.reply_addrs[0]);
  71                 }
  72         }
  73
  74 done:
  75         talloc_free(state->nbtsock);
  76         if (c->async.fn) {
  77                 c->async.fn(c);
  78         }
  79 }
  80
  81 /*
  82   nbtlist name resolution method - async send
  83  */
  84 struct smbcli_composite *resolve_name_nbtlist_send(struct nbt_name *name,
  85                                                    struct event_context *event_ctx,
  86                                                    const char **address_list,
  87                                                    BOOL broadcast,
  88                                                    BOOL wins_lookup)
  89 {
  90         struct smbcli_composite *c;
  91         struct nbtlist_state *state;
  92         int i;
  93         NTSTATUS status;
  94
  95         c = talloc_zero(NULL, struct smbcli_composite);
  96         if (c == NULL) goto failed;
  97
  98         state = talloc(c, struct nbtlist_state);
  99         if (state == NULL) goto failed;
 100
 101         status = nbt_name_dup(state, name, &state->name);
 102         if (!NT_STATUS_IS_OK(status)) goto failed;
 103
 104         state->nbtsock = nbt_name_socket_init(state, event_ctx);
 105         if (state->nbtsock == NULL) goto failed;
 106
 107         /* count the address_list size */
 108         for (i=0;address_list[i];i++) /* noop */ ;
 109
 110         state->num_queries = i;
 111         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 112         if (!state->io_queries) goto failed;
 113
 114         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 115         if (!state->queries) goto failed;
 116
 117         for (i=0;i<state->num_queries;i++) {
 118                 state->io_queries[i].in.name = state->name;
 119                 state->io_queries[i].in.dest_addr = talloc_strdup(state->io_queries, address_list[i]);
 120                 if (!state->io_queries[i].in.dest_addr) goto failed;
 121                 state->io_queries[i].in.broadcast = broadcast;
 122                 state->io_queries[i].in.wins_lookup = wins_lookup;
 123                 state->io_queries[i].in.timeout = lp_parm_int(-1, "nbt", "timeout", 3);
 124
 125                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 126                 if (!state->queries[i]) goto failed;
 127
 128                 state->queries[i]->async.fn = nbtlist_handler;
 129                 state->queries[i]->async.private = c;
 130         }
 131
 132         c->state = SMBCLI_REQUEST_SEND;
 133         c->private = state;
 134         c->event_ctx = talloc_reference(c, state->nbtsock->event_ctx);
 135
 136         return c;
 137
 138 failed:
 139         talloc_free(c);
 140         return NULL;
 141 }
 142
 143 /*
 144   nbt list of addresses name resolution method - recv side
 145  */
 146 NTSTATUS resolve_name_nbtlist_recv(struct smbcli_composite *c,
 147                                    TALLOC_CTX *mem_ctx, const char **reply_addr)
 148 {
 149         NTSTATUS status;
 150
 151         status = smb_composite_wait(c);
 152
 153         if (NT_STATUS_IS_OK(status)) {
 154                 struct nbtlist_state *state = talloc_get_type(c->private, struct nbtlist_state);
 155                 *reply_addr = talloc_steal(mem_ctx, state->reply_addr);
 156         }
 157
 158         talloc_free(c);
 159         return status;
 160 }
 161
 162 /*
 163   nbt list of addresses name resolution method - sync call
 164  */
 165 NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
 166                               TALLOC_CTX *mem_ctx,
 167                               const char **address_list,
 168                               BOOL broadcast, BOOL wins_lookup,
 169                               const char **reply_addr)
 170 {
 171         struct smbcli_composite *c = resolve_name_nbtlist_send(name, NULL, address_list,
 172                                                                broadcast, wins_lookup);
 173         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 174 }
 175