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 composite_context *c = talloc_get_type(req->async.private,
  47                                                      struct composite_context);
  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                         struct nbt_name_query *q = &state->io_queries[i];
  70                         c->state = SMBCLI_REQUEST_DONE;
  71                         /* favor a local address if possible */
  72                         state->reply_addr = NULL;
  73                         for (i=0;i<q->out.num_addrs;i++) {
  74                                 if (iface_is_local(q->out.reply_addrs[i])) {
  75                                         state->reply_addr = talloc_steal(state,
  76                                                                          q->out.reply_addrs[i]);
  77                                         break;
  78                                 }
  79                         }
  80                         if (state->reply_addr == NULL) {
  81                                 state->reply_addr = talloc_steal(state,
  82                                                                  q->out.reply_addrs[0]);
  83                         }
  84                 }
  85         }
  86
  87 done:
  88         talloc_free(state->nbtsock);
  89         if (c->async.fn) {
  90                 c->async.fn(c);
  91         }
  92 }
  93
  94 /*
  95   nbtlist name resolution method - async send
  96  */
  97 struct composite_context *resolve_name_nbtlist_send(struct nbt_name *name,
  98                                                    struct event_context *event_ctx,
  99                                                    const char **address_list,
 100                                                    BOOL broadcast,
 101                                                    BOOL wins_lookup)
 102 {
 103         struct composite_context *c;
 104         struct nbtlist_state *state;
 105         int i;
 106         NTSTATUS status;
 107
 108         c = talloc_zero(NULL, struct composite_context);
 109         if (c == NULL) goto failed;
 110
 111         state = talloc(c, struct nbtlist_state);
 112         if (state == NULL) goto failed;
 113
 114         status = nbt_name_dup(state, name, &state->name);
 115         if (!NT_STATUS_IS_OK(status)) goto failed;
 116
 117         state->name.name = strupper_talloc(state, state->name.name);
 118         if (state->name.name == NULL) goto failed;
 119         if (state->name.scope) {
 120                 state->name.scope = strupper_talloc(state, state->name.scope);
 121                 if (state->name.scope == NULL) goto failed;
 122         }
 123
 124         state->nbtsock = nbt_name_socket_init(state, event_ctx);
 125         if (state->nbtsock == NULL) goto failed;
 126
 127         /* count the address_list size */
 128         for (i=0;address_list[i];i++) /* noop */ ;
 129
 130         state->num_queries = i;
 131         state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
 132         if (!state->io_queries) goto failed;
 133
 134         state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
 135         if (!state->queries) goto failed;
 136
 137         for (i=0;i<state->num_queries;i++) {
 138                 state->io_queries[i].in.name = state->name;
 139                 state->io_queries[i].in.dest_addr = talloc_strdup(state->io_queries, address_list[i]);
 140                 if (!state->io_queries[i].in.dest_addr) goto failed;
 141                 state->io_queries[i].in.broadcast = broadcast;
 142                 state->io_queries[i].in.wins_lookup = wins_lookup;
 143                 state->io_queries[i].in.timeout = lp_parm_int(-1, "nbt", "timeout", 1);
 144
 145                 state->io_queries[i].in.retries = 2;
 146                 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
 147                 if (!state->queries[i]) goto failed;
 148
 149                 state->queries[i]->async.fn = nbtlist_handler;
 150                 state->queries[i]->async.private = c;
 151         }
 152
 153         c->state = SMBCLI_REQUEST_SEND;
 154         c->private = state;
 155         c->event_ctx = talloc_reference(c, state->nbtsock->event_ctx);
 156
 157         return c;
 158
 159 failed:
 160         talloc_free(c);
 161         return NULL;
 162 }
 163
 164 /*
 165   nbt list of addresses name resolution method - recv side
 166  */
 167 NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
 168                                    TALLOC_CTX *mem_ctx, const char **reply_addr)
 169 {
 170         NTSTATUS status;
 171
 172         status = composite_wait(c);
 173
 174         if (NT_STATUS_IS_OK(status)) {
 175                 struct nbtlist_state *state = talloc_get_type(c->private, struct nbtlist_state);
 176                 *reply_addr = talloc_steal(mem_ctx, state->reply_addr);
 177         }
 178
 179         talloc_free(c);
 180         return status;
 181 }
 182
 183 /*
 184   nbt list of addresses name resolution method - sync call
 185  */
 186 NTSTATUS resolve_name_nbtlist(struct nbt_name *name,
 187                               TALLOC_CTX *mem_ctx,
 188                               const char **address_list,
 189                               BOOL broadcast, BOOL wins_lookup,
 190                               const char **reply_addr)
 191 {
 192         struct composite_context *c = resolve_name_nbtlist_send(name, NULL, address_list,
 193                                                                broadcast, wins_lookup);
 194         return resolve_name_nbtlist_recv(c, mem_ctx, reply_addr);
 195 }
 196