source4/libcli/nbt/nameregister.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    send out a name registration 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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libcli/nbt/libnbt.h"
  24 #include "libcli/nbt/nbt_proto.h"
  25 #include "libcli/composite/composite.h"
  26 #include "lib/socket/socket.h"
  27 #include "librpc/gen_ndr/ndr_nbt.h"
  28 #include "param/param.h"
  29
  30 /*
  31   send a nbt name registration request
  32 */
  33 struct nbt_name_request *nbt_name_register_send(struct nbt_name_socket *nbtsock,
  34                                                 struct nbt_name_register *io)
  35 {
  36         struct nbt_name_request *req;
  37         struct nbt_name_packet *packet;
  38         struct socket_address *dest;
  39
  40         packet = talloc_zero(nbtsock, struct nbt_name_packet);
  41         if (packet == NULL) return NULL;
  42
  43         packet->qdcount = 1;
  44         packet->arcount = 1;
  45         if (io->in.multi_homed) {
  46                 packet->operation = NBT_OPCODE_MULTI_HOME_REG;
  47         } else {
  48                 packet->operation = NBT_OPCODE_REGISTER;
  49         }
  50         if (io->in.broadcast) {
  51                 packet->operation |= NBT_FLAG_BROADCAST;
  52         }
  53         if (io->in.register_demand) {
  54                 packet->operation |= NBT_FLAG_RECURSION_DESIRED;
  55         }
  56
  57         packet->questions = talloc_array(packet, struct nbt_name_question, 1);
  58         if (packet->questions == NULL) goto failed;
  59
  60         packet->questions[0].name           = io->in.name;
  61         packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
  62         packet->questions[0].question_class = NBT_QCLASS_IP;
  63
  64         packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
  65         if (packet->additional == NULL) goto failed;
  66
  67         packet->additional[0].name                   = io->in.name;
  68         packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
  69         packet->additional[0].rr_class               = NBT_QCLASS_IP;
  70         packet->additional[0].ttl                    = io->in.ttl;
  71         packet->additional[0].rdata.netbios.length   = 6;
  72         packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
  73                                                                      struct nbt_rdata_address, 1);
  74         if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
  75         packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
  76         packet->additional[0].rdata.netbios.addresses[0].ipaddr =
  77                 talloc_strdup(packet->additional, io->in.address);
  78         if (packet->additional[0].rdata.netbios.addresses[0].ipaddr == NULL) goto failed;
  79
  80         dest = socket_address_from_strings(packet, nbtsock->sock->backend_name,
  81                                            io->in.dest_addr, io->in.dest_port);
  82         if (dest == NULL) goto failed;
  83         req = nbt_name_request_send(nbtsock, dest, packet,
  84                                     io->in.timeout, io->in.retries, false);
  85         if (req == NULL) goto failed;
  86
  87         talloc_free(packet);
  88         return req;
  89
  90 failed:
  91         talloc_free(packet);
  92         return NULL;
  93 }
  94
  95 /*
  96   wait for a registration reply
  97 */
  98 _PUBLIC_ NTSTATUS nbt_name_register_recv(struct nbt_name_request *req,
  99                                 TALLOC_CTX *mem_ctx, struct nbt_name_register *io)
 100 {
 101         NTSTATUS status;
 102         struct nbt_name_packet *packet;
 103
 104         status = nbt_name_request_recv(req);
 105         if (!NT_STATUS_IS_OK(status) ||
 106             req->num_replies == 0) {
 107                 talloc_free(req);
 108                 return status;
 109         }
 110
 111         packet = req->replies[0].packet;
 112         io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
 113
 114         if (packet->ancount != 1 ||
 115             packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
 116             packet->answers[0].rr_class != NBT_QCLASS_IP) {
 117                 talloc_free(req);
 118                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 119         }
 120
 121         io->out.rcode = packet->operation & NBT_RCODE;
 122         io->out.name = packet->answers[0].name;
 123         if (packet->answers[0].rdata.netbios.length < 6) {
 124                 talloc_free(req);
 125                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 126         }
 127         io->out.reply_addr = talloc_steal(mem_ctx,
 128                                           packet->answers[0].rdata.netbios.addresses[0].ipaddr);
 129         talloc_steal(mem_ctx, io->out.name.name);
 130         talloc_steal(mem_ctx, io->out.name.scope);
 131
 132         talloc_free(req);
 133
 134         return NT_STATUS_OK;
 135 }
 136
 137 /*
 138   synchronous name registration request
 139 */
 140 _PUBLIC_ NTSTATUS nbt_name_register(struct nbt_name_socket *nbtsock,
 141                            TALLOC_CTX *mem_ctx, struct nbt_name_register *io)
 142 {
 143         struct nbt_name_request *req = nbt_name_register_send(nbtsock, io);
 144         return nbt_name_register_recv(req, mem_ctx, io);
 145 }
 146
 147
 148 /*
 149   a 4 step broadcast registration. 3 lots of name registration requests, followed by
 150   a name registration demand
 151 */
 152 struct register_bcast_state {
 153         struct nbt_name_socket *nbtsock;
 154         struct nbt_name_register *io;
 155         struct nbt_name_request *req;
 156 };
 157
 158
 159 /*
 160   state handler for 4 stage name registration
 161 */
 162 static void name_register_bcast_handler(struct nbt_name_request *req)
 163 {
 164         struct composite_context *c = talloc_get_type(req->async.private_data, struct composite_context);
 165         struct register_bcast_state *state = talloc_get_type(c->private_data, struct register_bcast_state);
 166         NTSTATUS status;
 167
 168         status = nbt_name_register_recv(state->req, state, state->io);
 169         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 170                 if (state->io->in.register_demand == true) {
 171                         /* all done */
 172                         c->state = COMPOSITE_STATE_DONE;
 173                         c->status = NT_STATUS_OK;
 174                         goto done;
 175                 }
 176
 177                 /* the registration timed out - good, send the demand */
 178                 state->io->in.register_demand = true;
 179                 state->io->in.retries         = 0;
 180                 state->req = nbt_name_register_send(state->nbtsock, state->io);
 181                 if (state->req == NULL) {
 182                         c->state = COMPOSITE_STATE_ERROR;
 183                         c->status = NT_STATUS_NO_MEMORY;
 184                 } else {
 185                         state->req->async.fn      = name_register_bcast_handler;
 186                         state->req->async.private_data = c;
 187                 }
 188         } else if (!NT_STATUS_IS_OK(status)) {
 189                 c->state = COMPOSITE_STATE_ERROR;
 190                 c->status = status;
 191         } else {
 192                 c->state = COMPOSITE_STATE_ERROR;
 193                 c->status = NT_STATUS_CONFLICTING_ADDRESSES;
 194                 DEBUG(3,("Name registration conflict from %s for %s with ip %s - rcode %d\n",
 195                          state->io->out.reply_from,
 196                          nbt_name_string(state, &state->io->out.name),
 197                          state->io->out.reply_addr,
 198                          state->io->out.rcode));
 199         }
 200
 201 done:
 202         if (c->state >= COMPOSITE_STATE_DONE &&
 203             c->async.fn) {
 204                 c->async.fn(c);
 205         }
 206 }
 207
 208 /*
 209   the async send call for a 4 stage name registration
 210 */
 211 _PUBLIC_ struct composite_context *nbt_name_register_bcast_send(struct nbt_name_socket *nbtsock,
 212                                                        struct nbt_name_register_bcast *io)
 213 {
 214         struct composite_context *c;
 215         struct register_bcast_state *state;
 216
 217         c = talloc_zero(nbtsock, struct composite_context);
 218         if (c == NULL) goto failed;
 219
 220         state = talloc(c, struct register_bcast_state);
 221         if (state == NULL) goto failed;
 222
 223         state->io = talloc(state, struct nbt_name_register);
 224         if (state->io == NULL) goto failed;
 225
 226         state->io->in.name            = io->in.name;
 227         state->io->in.dest_addr       = io->in.dest_addr;
 228         state->io->in.dest_port       = io->in.dest_port;
 229         state->io->in.address         = io->in.address;
 230         state->io->in.nb_flags        = io->in.nb_flags;
 231         state->io->in.register_demand = false;
 232         state->io->in.broadcast       = true;
 233         state->io->in.multi_homed     = false;
 234         state->io->in.ttl             = io->in.ttl;
 235         state->io->in.timeout         = 1;
 236         state->io->in.retries         = 2;
 237
 238         state->nbtsock = nbtsock;
 239
 240         state->req = nbt_name_register_send(nbtsock, state->io);
 241         if (state->req == NULL) goto failed;
 242
 243         state->req->async.fn      = name_register_bcast_handler;
 244         state->req->async.private_data = c;
 245
 246         c->private_data = state;
 247         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 248         c->event_ctx    = nbtsock->event_ctx;
 249
 250         return c;
 251
 252 failed:
 253         talloc_free(c);
 254         return NULL;
 255 }
 256
 257 /*
 258   broadcast 4 part name register - recv
 259 */
 260 _PUBLIC_ NTSTATUS nbt_name_register_bcast_recv(struct composite_context *c)
 261 {
 262         NTSTATUS status;
 263         status = composite_wait(c);
 264         talloc_free(c);
 265         return status;
 266 }
 267
 268 /*
 269   broadcast 4 part name register - sync interface
 270 */
 271 NTSTATUS nbt_name_register_bcast(struct nbt_name_socket *nbtsock,
 272                                  struct nbt_name_register_bcast *io)
 273 {
 274         struct composite_context *c = nbt_name_register_bcast_send(nbtsock, io);
 275         return nbt_name_register_bcast_recv(c);
 276 }
 277
 278
 279 /*
 280   a wins name register with multiple WINS servers and multiple
 281   addresses to register. Try each WINS server in turn, until we get a
 282   reply for each address
 283 */
 284 struct register_wins_state {
 285         struct nbt_name_socket *nbtsock;
 286         struct nbt_name_register *io;
 287         const char **wins_servers;
 288         uint16_t wins_port;
 289         const char **addresses;
 290         int address_idx;
 291         struct nbt_name_request *req;
 292 };
 293
 294
 295 /*
 296   state handler for WINS multi-homed multi-server name register
 297 */
 298 static void name_register_wins_handler(struct nbt_name_request *req)
 299 {
 300         struct composite_context *c = talloc_get_type(req->async.private_data,
 301                                                       struct composite_context);
 302         struct register_wins_state *state = talloc_get_type(c->private_data,
 303                                                             struct register_wins_state);
 304         NTSTATUS status;
 305
 306         status = nbt_name_register_recv(state->req, state, state->io);
 307         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 308                 /* the register timed out - try the next WINS server */
 309                 state->wins_servers++;
 310                 state->address_idx = 0;
 311                 if (state->wins_servers[0] == NULL) {
 312                         c->state = COMPOSITE_STATE_ERROR;
 313                         c->status = status;
 314                         goto done;
 315                 }
 316                 state->io->in.dest_addr = state->wins_servers[0];
 317                 state->io->in.dest_port = state->wins_port;
 318                 state->io->in.address   = state->addresses[0];
 319                 state->req = nbt_name_register_send(state->nbtsock, state->io);
 320                 if (state->req == NULL) {
 321                         c->state = COMPOSITE_STATE_ERROR;
 322                         c->status = NT_STATUS_NO_MEMORY;
 323                 } else {
 324                         state->req->async.fn      = name_register_wins_handler;
 325                         state->req->async.private_data = c;
 326                 }
 327         } else if (!NT_STATUS_IS_OK(status)) {
 328                 c->state = COMPOSITE_STATE_ERROR;
 329                 c->status = status;
 330         } else {
 331                 if (state->io->out.rcode == 0 &&
 332                     state->addresses[state->address_idx+1] != NULL) {
 333                         /* register our next address */
 334                         state->io->in.address = state->addresses[++(state->address_idx)];
 335                         state->req = nbt_name_register_send(state->nbtsock, state->io);
 336                         if (state->req == NULL) {
 337                                 c->state = COMPOSITE_STATE_ERROR;
 338                                 c->status = NT_STATUS_NO_MEMORY;
 339                         } else {
 340                                 state->req->async.fn      = name_register_wins_handler;
 341                                 state->req->async.private_data = c;
 342                         }
 343                 } else {
 344                         c->state = COMPOSITE_STATE_DONE;
 345                         c->status = NT_STATUS_OK;
 346                 }
 347         }
 348
 349 done:
 350         if (c->state >= COMPOSITE_STATE_DONE &&
 351             c->async.fn) {
 352                 c->async.fn(c);
 353         }
 354 }
 355
 356 /*
 357   the async send call for a multi-server WINS register
 358 */
 359 _PUBLIC_ struct composite_context *nbt_name_register_wins_send(struct nbt_name_socket *nbtsock,
 360                                                       struct nbt_name_register_wins *io)
 361 {
 362         struct composite_context *c;
 363         struct register_wins_state *state;
 364
 365         c = talloc_zero(nbtsock, struct composite_context);
 366         if (c == NULL) goto failed;
 367
 368         state = talloc(c, struct register_wins_state);
 369         if (state == NULL) goto failed;
 370
 371         state->io = talloc(state, struct nbt_name_register);
 372         if (state->io == NULL) goto failed;
 373
 374         state->wins_port = io->in.wins_port;
 375         state->wins_servers = str_list_copy(state, io->in.wins_servers);
 376         if (state->wins_servers == NULL ||
 377             state->wins_servers[0] == NULL) goto failed;
 378
 379         state->addresses = str_list_copy(state, io->in.addresses);
 380         if (state->addresses == NULL ||
 381             state->addresses[0] == NULL) goto failed;
 382
 383         state->io->in.name            = io->in.name;
 384         state->io->in.dest_addr       = state->wins_servers[0];
 385         state->io->in.dest_port       = state->wins_port;
 386         state->io->in.address         = io->in.addresses[0];
 387         state->io->in.nb_flags        = io->in.nb_flags;
 388         state->io->in.broadcast       = false;
 389         state->io->in.register_demand = false;
 390         state->io->in.multi_homed     = (io->in.nb_flags & NBT_NM_GROUP)?false:true;
 391         state->io->in.ttl             = io->in.ttl;
 392         state->io->in.timeout         = 3;
 393         state->io->in.retries         = 2;
 394
 395         state->nbtsock     = nbtsock;
 396         state->address_idx = 0;
 397
 398         state->req = nbt_name_register_send(nbtsock, state->io);
 399         if (state->req == NULL) goto failed;
 400
 401         state->req->async.fn      = name_register_wins_handler;
 402         state->req->async.private_data = c;
 403
 404         c->private_data = state;
 405         c->state        = COMPOSITE_STATE_IN_PROGRESS;
 406         c->event_ctx    = nbtsock->event_ctx;
 407
 408         return c;
 409
 410 failed:
 411         talloc_free(c);
 412         return NULL;
 413 }
 414
 415 /*
 416   multi-homed WINS name register - recv side
 417 */
 418 _PUBLIC_ NTSTATUS nbt_name_register_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 419                                      struct nbt_name_register_wins *io)
 420 {
 421         NTSTATUS status;
 422         status = composite_wait(c);
 423         if (NT_STATUS_IS_OK(status)) {
 424                 struct register_wins_state *state =
 425                         talloc_get_type(c->private_data, struct register_wins_state);
 426                 io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
 427                 io->out.rcode = state->io->out.rcode;
 428         }
 429         talloc_free(c);
 430         return status;
 431 }
 432
 433 /*
 434   multi-homed WINS register - sync interface
 435 */
 436 _PUBLIC_ NTSTATUS nbt_name_register_wins(struct nbt_name_socket *nbtsock,
 437                                 TALLOC_CTX *mem_ctx,
 438                                 struct nbt_name_register_wins *io)
 439 {
 440         struct composite_context *c = nbt_name_register_wins_send(nbtsock, io);
 441         return nbt_name_register_wins_recv(c, mem_ctx, io);
 442 }