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/composite/composite.h"
  29 #include "system/network.h"
  30 #include "lib/socket/netif.h"
  31 #include "librpc/gen_ndr/ndr_nbt.h"
  32 #include "libcli/nbt/libnbt.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         int i;
  52
  53         for (i=0;i<state->num_queries;i++) {
  54                 if (req == state->queries[i]) break;
  55         }
  56
  57         if (i == state->num_queries) {
  58                 /* not for us?! */
  59                 c->status = NT_STATUS_INTERNAL_ERROR;
  60                 c->state = COMPOSITE_STATE_ERROR;
  61                 goto done;
  62         }
  63
  64         c->status = nbt_name_query_recv(req, state, &state->io_queries[i]);
  65         if (!NT_STATUS_IS_OK(c->status)) {
  66                 c->state = COMPOSITE_STATE_ERROR;
  67
  68         } else {
  69                 if (state->io_queries[i].out.num_addrs < 1) {
  70                         c->state = COMPOSITE_STATE_ERROR;
  71                         c->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  72
  73                 } else {
  74                         struct nbt_name_query *q = &state->io_queries[i];
  75                         c->state = COMPOSITE_STATE_DONE;
  76                         /* favor a local address if possible */
  77                         state->reply_addr = NULL;
  78
  79                         for (i=0;i<q->out.num_addrs;i++) {
  80                                 if (iface_is_local(q->out.reply_addrs[i])) {
  81                                         state->reply_addr = talloc_steal(state,
  82                                                                          q->out.reply_addrs[i]);
  83                                         break;
  84                                 }
  85                         }
  86
  87                         if (state->reply_addr == NULL) {
  88                                 state->reply_addr = talloc_steal(state,
  89                                                                  q->out.reply_addrs[0]);
  90                         }
  91                 }
  92         }
  93
  94 done:
  95         talloc_free(state->nbtsock);
  96         if (c->async.fn) {
  97                 c->async.fn(c);
  98         }
  99 }
 100
 101 /*
 102   nbtlist name resolution method - async send
 103  */
 104 struct composite_context *resolve_name_nbtlist_send(struct nbt_name *name,
 105                                                    struct event_context *event_ctx,
 106                                                    const char **address_list,
 107                                                    BOOL broadcast,
 108                                                    BOOL wins_lookup)
 109 {
 110         struct composite_context *c;
 111         struct nbtlist_state *state;
 112         int i;
 113         NTSTATUS status;
 114
 115         c = talloc_zero(NULL, struct composite_context);
 116         if (c == NULL) goto failed;
 117
 118         state = talloc(c, struct nbtlist_state);
 119         if (state == NULL) goto failed;
 120
 121         status = nbt_name_dup(state, name, &state->name);
 122         if (!NT_STATUS_IS_OK(status)) goto failed;
 123
 124         state->name.name = strupper_talloc(state, state->name.name);
 125         if (state->name.name == NULL) goto failed;
 126         if (state->name.scope) {
 127                 state->name.scope = strupper_talloc(state, state->name.scope);
 128                 if (state->name.scope == NULL) goto failed;
 129         }
 130
 131         state->nbtsock = nbt_name_socket_init(state, event_ctx);
 132         if (state->nbtsock == NULL) goto failed;
 133
 134         /* count the address_list size */
 135         for (i=0;address_list[i];i++) /* noop */ ;
 136
 137         state->num_queries = i;
 138         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 139         if (!state->io_queries) goto failed;
 140
 141         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 142         if (!state->queries) goto failed;
 143
 144         for (i=0;i<state->num_queries;i++) {
 145                 state->io_queries[i].in.name        = state->name;
 146                 state->io_queries[i].in.dest_addr   = talloc_strdup(state->io_queries, address_list[i]);
 147                 if (!state->io_queries[i].in.dest_addr) goto failed;
 148
 149                 state->io_queries[i].in.broadcast   = broadcast;
 150                 state->io_queries[i].in.wins_lookup = wins_lookup;
 151                 state->io_queries[i].in.timeout     = lp_parm_int(-1, "nbt", "timeout", 1);
 152                 state->io_queries[i].in.retries     = 2;
 153
 154                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 155                 if (!state->queries[i]) goto failed;
 156
 157                 state->queries[i]->async.fn      = nbtlist_handler;
 158                 state->queries[i]->async.private = c;
 159         }
 160
 161         c->state = COMPOSITE_STATE_IN_PROGRESS;
 162         c->private_data = state;
 163         c->event_ctx = talloc_reference(c, state->nbtsock->event_ctx);
 164
 165         return c;
 166
 167 failed:
 168         talloc_free(c);
 169         return NULL;
 170 }
 171
 172 /*
 173   nbt list of addresses name resolution method - recv side
 174  */
 175 NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
 176                                    TALLOC_CTX *mem_ctx, const char **reply_addr)
 177 {
 178         NTSTATUS status;
 179
 180         status = composite_wait(c);
 181
 182         if (NT_STATUS_IS_OK(status)) {
 183                 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
 184                 *reply_addr = talloc_steal(mem_ctx, state->reply_addr);
 185         }
 186
 187         talloc_free(c);
 188         return status;
 189 }
 190
 191 /*
 192   nbt list of addresses name resolution method - sync call
 193  */
 194 NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
 195                               TALLOC_CTX *mem_ctx,
 196                               const char **address_list,
 197                               BOOL broadcast, BOOL wins_lookup,
 198                               const char **reply_addr)
 199 {
 200         struct composite_context *c = resolve_name_nbtlist_send(name, NULL, address_list,
 201                                                                broadcast, wins_lookup);
 202         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 203 }
 204