source4/libcli/nbt/namerefresh.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    send out a name refresh request
   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 #include "includes.h"
  24 #include "libcli/nbt/libnbt.h"
  25 #include "libcli/raw/libcliraw.h"
  26 #include "libcli/composite/composite.h"
  27
  28 /*
  29   send a nbt name refresh request
  30 */
  31 struct nbt_name_request *nbt_name_refresh_send(struct nbt_name_socket *nbtsock,
  32                                                struct nbt_name_refresh *io)
  33 {
  34         struct nbt_name_request *req;
  35         struct nbt_name_packet *packet;
  36
  37         packet = talloc_zero(nbtsock, struct nbt_name_packet);
  38         if (packet == NULL) return NULL;
  39
  40         packet->qdcount = 1;
  41         packet->arcount = 1;
  42         packet->operation = NBT_OPCODE_REFRESH;
  43         if (io->in.broadcast) {
  44                 packet->operation |= NBT_FLAG_BROADCAST;
  45         }
  46
  47         packet->questions = talloc_array(packet, struct nbt_name_question, 1);
  48         if (packet->questions == NULL) goto failed;
  49
  50         packet->questions[0].name           = io->in.name;
  51         packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
  52         packet->questions[0].question_class = NBT_QCLASS_IP;
  53
  54         packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
  55         if (packet->additional == NULL) goto failed;
  56
  57         packet->additional[0].name                   = io->in.name;
  58         packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
  59         packet->additional[0].rr_class               = NBT_QCLASS_IP;
  60         packet->additional[0].ttl                    = io->in.ttl;
  61         packet->additional[0].rdata.netbios.length   = 6;
  62         packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
  63                                                                      struct nbt_rdata_address, 1);
  64         if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
  65         packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
  66         packet->additional[0].rdata.netbios.addresses[0].ipaddr =
  67                 talloc_strdup(packet->additional, io->in.address);
  68
  69         req = nbt_name_request_send(nbtsock, io->in.dest_addr, lp_nbt_port(), packet,
  70                                     io->in.timeout, io->in.retries, False);
  71         if (req == NULL) goto failed;
  72
  73         talloc_free(packet);
  74         return req;
  75
  76 failed:
  77         talloc_free(packet);
  78         return NULL;
  79 }
  80
  81 /*
  82   wait for a refresh reply
  83 */
  84 NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req,
  85                                TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
  86 {
  87         NTSTATUS status;
  88         struct nbt_name_packet *packet;
  89
  90         status = nbt_name_request_recv(req);
  91         if (!NT_STATUS_IS_OK(status) ||
  92             req->num_replies == 0) {
  93                 talloc_free(req);
  94                 return status;
  95         }
  96
  97         packet = req->replies[0].packet;
  98         io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].reply_addr);
  99
 100         if (packet->ancount != 1 ||
 101             packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
 102             packet->answers[0].rr_class != NBT_QCLASS_IP) {
 103                 talloc_free(req);
 104                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 105         }
 106
 107         io->out.rcode = packet->operation & NBT_RCODE;
 108         io->out.name = packet->answers[0].name;
 109         if (packet->answers[0].rdata.netbios.length < 6) {
 110                 talloc_free(req);
 111                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 112         }
 113         io->out.reply_addr = talloc_steal(mem_ctx,
 114                                           packet->answers[0].rdata.netbios.addresses[0].ipaddr);
 115         talloc_steal(mem_ctx, io->out.name.name);
 116         talloc_steal(mem_ctx, io->out.name.scope);
 117
 118         talloc_free(req);
 119
 120         return NT_STATUS_OK;
 121 }
 122
 123 /*
 124   synchronous name refresh request
 125 */
 126 NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock,
 127                            TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
 128 {
 129         struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io);
 130         return nbt_name_refresh_recv(req, mem_ctx, io);
 131 }
 132
 133
 134
 135 /*
 136   a wins name refresh with multiple WINS servers and multiple
 137   addresses to refresh. Try each WINS server in turn, until we get a
 138   reply for each address
 139 */
 140 struct refresh_wins_state {
 141         struct nbt_name_socket *nbtsock;
 142         struct nbt_name_refresh *io;
 143         const char **wins_servers;
 144         const char **addresses;
 145         int address_idx;
 146         struct nbt_name_request *req;
 147 };
 148
 149
 150 /*
 151   state handler for WINS multi-homed multi-server name refresh
 152 */
 153 static void name_refresh_wins_handler(struct nbt_name_request *req)
 154 {
 155         struct composite_context *c = talloc_get_type(req->async.private,
 156                                                       struct composite_context);
 157         struct refresh_wins_state *state = talloc_get_type(c->private,
 158                                                             struct refresh_wins_state);
 159         NTSTATUS status;
 160
 161         status = nbt_name_refresh_recv(state->req, state, state->io);
 162         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 163                 /* the refresh timed out - try the next WINS server */
 164                 state->wins_servers++;
 165                 state->address_idx = 0;
 166                 if (state->wins_servers[0] == NULL) {
 167                         c->state = SMBCLI_REQUEST_ERROR;
 168                         c->status = status;
 169                         goto done;
 170                 }
 171                 state->io->in.dest_addr = state->wins_servers[0];
 172                 state->io->in.address   = state->addresses[0];
 173                 state->req = nbt_name_refresh_send(state->nbtsock, state->io);
 174                 if (state->req == NULL) {
 175                         c->state = SMBCLI_REQUEST_ERROR;
 176                         c->status = NT_STATUS_NO_MEMORY;
 177                 } else {
 178                         state->req->async.fn      = name_refresh_wins_handler;
 179                         state->req->async.private = c;
 180                 }
 181         } else if (!NT_STATUS_IS_OK(status)) {
 182                 c->state = SMBCLI_REQUEST_ERROR;
 183                 c->status = status;
 184         } else {
 185                 if (state->io->out.rcode == 0 &&
 186                     state->addresses[state->address_idx+1] != NULL) {
 187                         /* refresh our next address */
 188                         state->io->in.address = state->addresses[++(state->address_idx)];
 189                         state->req = nbt_name_refresh_send(state->nbtsock, state->io);
 190                         if (state->req == NULL) {
 191                                 c->state = SMBCLI_REQUEST_ERROR;
 192                                 c->status = NT_STATUS_NO_MEMORY;
 193                         } else {
 194                                 state->req->async.fn      = name_refresh_wins_handler;
 195                                 state->req->async.private = c;
 196                         }
 197                 } else {
 198                         c->state = SMBCLI_REQUEST_DONE;
 199                         c->status = NT_STATUS_OK;
 200                 }
 201         }
 202
 203 done:
 204         if (c->state >= SMBCLI_REQUEST_DONE &&
 205             c->async.fn) {
 206                 c->async.fn(c);
 207         }
 208 }
 209
 210 /*
 211   the async send call for a multi-server WINS refresh
 212 */
 213 struct composite_context *nbt_name_refresh_wins_send(struct nbt_name_socket *nbtsock,
 214                                                       struct nbt_name_refresh_wins *io)
 215 {
 216         struct composite_context *c;
 217         struct refresh_wins_state *state;
 218
 219         c = talloc_zero(nbtsock, struct composite_context);
 220         if (c == NULL) goto failed;
 221
 222         state = talloc(c, struct refresh_wins_state);
 223         if (state == NULL) goto failed;
 224
 225         state->io = talloc(state, struct nbt_name_refresh);
 226         if (state->io == NULL) goto failed;
 227
 228         state->wins_servers = str_list_copy(state, io->in.wins_servers);
 229         if (state->wins_servers == NULL ||
 230             state->wins_servers[0] == NULL) goto failed;
 231
 232         state->addresses = str_list_copy(state, io->in.addresses);
 233         if (state->addresses == NULL ||
 234             state->addresses[0] == NULL) goto failed;
 235
 236         state->io->in.name            = io->in.name;
 237         state->io->in.dest_addr       = state->wins_servers[0];
 238         state->io->in.address         = io->in.addresses[0];
 239         state->io->in.nb_flags        = io->in.nb_flags;
 240         state->io->in.broadcast       = False;
 241         state->io->in.ttl             = io->in.ttl;
 242         state->io->in.timeout         = 2;
 243         state->io->in.retries         = 2;
 244
 245         state->nbtsock     = nbtsock;
 246         state->address_idx = 0;
 247
 248         state->req = nbt_name_refresh_send(nbtsock, state->io);
 249         if (state->req == NULL) goto failed;
 250
 251         state->req->async.fn      = name_refresh_wins_handler;
 252         state->req->async.private = c;
 253
 254         c->private   = state;
 255         c->state     = SMBCLI_REQUEST_SEND;
 256         c->event_ctx = nbtsock->event_ctx;
 257
 258         return c;
 259
 260 failed:
 261         talloc_free(c);
 262         return NULL;
 263 }
 264
 265 /*
 266   multi-homed WINS name refresh - recv side
 267 */
 268 NTSTATUS nbt_name_refresh_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 269                                      struct nbt_name_refresh_wins *io)
 270 {
 271         NTSTATUS status;
 272         status = composite_wait(c);
 273         if (NT_STATUS_IS_OK(status)) {
 274                 struct refresh_wins_state *state =
 275                         talloc_get_type(c->private, struct refresh_wins_state);
 276                 io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
 277                 io->out.rcode = state->io->out.rcode;
 278         }
 279         talloc_free(c);
 280         return status;
 281 }
 282
 283 /*
 284   multi-homed WINS refresh - sync interface
 285 */
 286 NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock,
 287                                 TALLOC_CTX *mem_ctx,
 288                                 struct nbt_name_refresh_wins *io)
 289 {
 290         struct composite_context *c = nbt_name_refresh_wins_send(nbtsock, io);
 291         return nbt_name_refresh_wins_recv(c, mem_ctx, io);
 292 }