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
  30 struct nbtlist_state {
  31         struct nbt_name name;
  32         struct nbt_name_socket *nbtsock;
  33         int num_queries;
  34         struct nbt_name_request **queries;
  35         struct nbt_name_query *io_queries;
  36         const char *reply_addr;
  37 };
  38
  39 /*
  40   handle events during nbtlist name resolution
  41 */
  42 static void nbtlist_handler(struct nbt_name_request *req)
  43 {
  44         struct composite_context *c = talloc_get_type(req->async.private,
  45                                                       struct composite_context);
  46         struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
  47         int i;
  48
  49         for (i=0;i<state->num_queries;i++) {
  50                 if (req == state->queries[i]) break;
  51         }
  52
  53         if (i == state->num_queries) {
  54                 /* not for us?! */
  55                 c->status = NT_STATUS_INTERNAL_ERROR;
  56                 c->state = COMPOSITE_STATE_ERROR;
  57                 goto done;
  58         }
  59
  60         c->status = nbt_name_query_recv(req, state, &state->io_queries[i]);
  61         if (!NT_STATUS_IS_OK(c->status)) {
  62                 c->state = COMPOSITE_STATE_ERROR;
  63
  64         } else {
  65                 if (state->io_queries[i].out.num_addrs < 1) {
  66                         c->state = COMPOSITE_STATE_ERROR;
  67                         c->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  68
  69                 } else {
  70                         struct nbt_name_query *q = &state->io_queries[i];
  71                         c->state = COMPOSITE_STATE_DONE;
  72                         /* favor a local address if possible */
  73                         state->reply_addr = NULL;
  74
  75                         for (i=0;i<q->out.num_addrs;i++) {
  76                                 if (iface_is_local(q->out.reply_addrs[i])) {
  77                                         state->reply_addr = talloc_steal(state,
  78                                                                          q->out.reply_addrs[i]);
  79                                         break;
  80                                 }
  81                         }
  82
  83                         if (state->reply_addr == NULL) {
  84                                 state->reply_addr = talloc_steal(state,
  85                                                                  q->out.reply_addrs[0]);
  86                         }
  87                 }
  88         }
  89
  90 done:
  91         talloc_free(state->nbtsock);
  92         if (c->async.fn) {
  93                 c->async.fn(c);
  94         }
  95 }
  96
  97 /*
  98   nbtlist name resolution method - async send
  99  */
 100 struct composite_context *resolve_name_nbtlist_send(struct nbt_name *name,
 101                                                    struct event_context *event_ctx,
 102                                                    const char **address_list,
 103                                                    BOOL broadcast,
 104                                                    BOOL wins_lookup)
 105 {
 106         struct composite_context *c;
 107         struct nbtlist_state *state;
 108         int i;
 109         NTSTATUS status;
 110
 111         c = talloc_zero(NULL, struct composite_context);
 112         if (c == NULL) goto failed;
 113
 114         state = talloc(c, struct nbtlist_state);
 115         if (state == NULL) goto failed;
 116
 117         status = nbt_name_dup(state, name, &state->name);
 118         if (!NT_STATUS_IS_OK(status)) goto failed;
 119
 120         state->name.name = strupper_talloc(state, state->name.name);
 121         if (state->name.name == NULL) goto failed;
 122         if (state->name.scope) {
 123                 state->name.scope = strupper_talloc(state, state->name.scope);
 124                 if (state->name.scope == NULL) goto failed;
 125         }
 126
 127         state->nbtsock = nbt_name_socket_init(state, event_ctx);
 128         if (state->nbtsock == NULL) goto failed;
 129
 130         /* count the address_list size */
 131         for (i=0;address_list[i];i++) /* noop */ ;
 132
 133         state->num_queries = i;
 134         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 135         if (!state->io_queries) goto failed;
 136
 137         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 138         if (!state->queries) goto failed;
 139
 140         for (i=0;i<state->num_queries;i++) {
 141                 state->io_queries[i].in.name        = state->name;
 142                 state->io_queries[i].in.dest_addr   = talloc_strdup(state->io_queries, address_list[i]);
 143                 if (!state->io_queries[i].in.dest_addr) goto failed;
 144
 145                 state->io_queries[i].in.broadcast   = broadcast;
 146                 state->io_queries[i].in.wins_lookup = wins_lookup;
 147                 state->io_queries[i].in.timeout     = lp_parm_int(-1, "nbt", "timeout", 1);
 148                 state->io_queries[i].in.retries     = 2;
 149
 150                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 151                 if (!state->queries[i]) goto failed;
 152
 153                 state->queries[i]->async.fn      = nbtlist_handler;
 154                 state->queries[i]->async.private = c;
 155         }
 156
 157         c->state = COMPOSITE_STATE_IN_PROGRESS;
 158         c->private_data = state;
 159         c->event_ctx = talloc_reference(c, state->nbtsock->event_ctx);
 160
 161         return c;
 162
 163 failed:
 164         talloc_free(c);
 165         return NULL;
 166 }
 167
 168 /*
 169   nbt list of addresses name resolution method - recv side
 170  */
 171 NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
 172                                    TALLOC_CTX *mem_ctx, const char **reply_addr)
 173 {
 174         NTSTATUS status;
 175
 176         status = composite_wait(c);
 177
 178         if (NT_STATUS_IS_OK(status)) {
 179                 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
 180                 *reply_addr = talloc_steal(mem_ctx, state->reply_addr);
 181         }
 182
 183         talloc_free(c);
 184         return status;
 185 }
 186
 187 /*
 188   nbt list of addresses name resolution method - sync call
 189  */
 190 NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
 191                               TALLOC_CTX *mem_ctx,
 192                               const char **address_list,
 193                               BOOL broadcast, BOOL wins_lookup,
 194                               const char **reply_addr)
 195 {
 196         struct composite_context *c = resolve_name_nbtlist_send(name, NULL, address_list,
 197                                                                broadcast, wins_lookup);
 198         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 199 }
 200