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