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 <tevent.h>
  24 #include "../libcli/nbt/libnbt.h"
  25 #include "../libcli/nbt/nbt_proto.h"
  26 #include "lib/socket/socket.h"
  27 #include "librpc/gen_ndr/ndr_nbt.h"
  28 #include "../lib/util/tevent_ntstatus.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 nbt_name_register_bcast_state {
 153         struct nbt_name_socket *nbtsock;
 154         struct nbt_name_register io;
 155 };
 156
 157 static void nbt_name_register_bcast_handler(struct nbt_name_request *subreq);
 158
 159 /*
 160   the async send call for a 4 stage name registration
 161 */
 162 _PUBLIC_ struct tevent_req *nbt_name_register_bcast_send(TALLOC_CTX *mem_ctx,
 163                                         struct tevent_context *ev,
 164                                         struct nbt_name_socket *nbtsock,
 165                                         struct nbt_name_register_bcast *io)
 166 {
 167         struct tevent_req *req;
 168         struct nbt_name_register_bcast_state *state;
 169         struct nbt_name_request *subreq;
 170
 171         req = tevent_req_create(mem_ctx, &state,
 172                                 struct nbt_name_register_bcast_state);
 173         if (req == NULL) {
 174                 return NULL;
 175         }
 176
 177         state->io.in.name            = io->in.name;
 178         state->io.in.dest_addr       = io->in.dest_addr;
 179         state->io.in.dest_port       = io->in.dest_port;
 180         state->io.in.address         = io->in.address;
 181         state->io.in.nb_flags        = io->in.nb_flags;
 182         state->io.in.register_demand = false;
 183         state->io.in.broadcast       = true;
 184         state->io.in.multi_homed     = false;
 185         state->io.in.ttl             = io->in.ttl;
 186         state->io.in.timeout         = 1;
 187         state->io.in.retries         = 2;
 188
 189         state->nbtsock = nbtsock;
 190
 191         subreq = nbt_name_register_send(nbtsock, &state->io);
 192         if (tevent_req_nomem(subreq, req)) {
 193                 return tevent_req_post(req, ev);
 194         }
 195
 196         subreq->async.fn = nbt_name_register_bcast_handler;
 197         subreq->async.private_data = req;
 198
 199         return req;
 200 }
 201
 202 static void nbt_name_register_bcast_handler(struct nbt_name_request *subreq)
 203 {
 204         struct tevent_req *req =
 205                 talloc_get_type_abort(subreq->async.private_data,
 206                 struct tevent_req);
 207         struct nbt_name_register_bcast_state *state =
 208                 tevent_req_data(req,
 209                 struct nbt_name_register_bcast_state);
 210         NTSTATUS status;
 211
 212         status = nbt_name_register_recv(subreq, state, &state->io);
 213         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 214                 if (state->io.in.register_demand == true) {
 215                         tevent_req_done(req);
 216                         return;
 217                 }
 218
 219                 /* the registration timed out - good, send the demand */
 220                 state->io.in.register_demand = true;
 221                 state->io.in.retries         = 0;
 222
 223                 subreq = nbt_name_register_send(state->nbtsock, &state->io);
 224                 if (tevent_req_nomem(subreq, req)) {
 225                         return;
 226                 }
 227
 228                 subreq->async.fn = nbt_name_register_bcast_handler;
 229                 subreq->async.private_data = req;
 230                 return;
 231         }
 232
 233         if (!NT_STATUS_IS_OK(status)) {
 234                 tevent_req_nterror(req, status);
 235                 return;
 236         }
 237
 238         DEBUG(3,("Name registration conflict from %s for %s with ip %s - rcode %d\n",
 239                  state->io.out.reply_from,
 240                  nbt_name_string(state, &state->io.out.name),
 241                  state->io.out.reply_addr,
 242                  state->io.out.rcode));
 243
 244         tevent_req_nterror(req, NT_STATUS_CONFLICTING_ADDRESSES);
 245 }
 246
 247 /*
 248   broadcast 4 part name register - recv
 249 */
 250 _PUBLIC_ NTSTATUS nbt_name_register_bcast_recv(struct tevent_req *req)
 251 {
 252         NTSTATUS status;
 253
 254         if (tevent_req_is_nterror(req, &status)) {
 255                 tevent_req_received(req);
 256                 return status;
 257         }
 258
 259         tevent_req_received(req);
 260         return NT_STATUS_OK;
 261 }
 262
 263 /*
 264   broadcast 4 part name register - sync interface
 265 */
 266 NTSTATUS nbt_name_register_bcast(struct nbt_name_socket *nbtsock,
 267                                  struct nbt_name_register_bcast *io)
 268 {
 269         TALLOC_CTX *frame = talloc_stackframe();
 270         struct tevent_context *ev;
 271         struct tevent_req *subreq;
 272         NTSTATUS status;
 273
 274         /*
 275          * TODO: create a temporary event context
 276          */
 277         ev = nbtsock->event_ctx;
 278
 279         subreq = nbt_name_register_bcast_send(frame, ev, nbtsock, io);
 280         if (subreq == NULL) {
 281                 talloc_free(frame);
 282                 return NT_STATUS_NO_MEMORY;
 283         }
 284
 285         if (!tevent_req_poll(subreq, ev)) {
 286                 status = map_nt_error_from_unix_common(errno);
 287                 talloc_free(frame);
 288                 return status;
 289         }
 290
 291         status = nbt_name_register_bcast_recv(subreq);
 292         if (!NT_STATUS_IS_OK(status)) {
 293                 talloc_free(frame);
 294                 return status;
 295         }
 296
 297         TALLOC_FREE(frame);
 298         return NT_STATUS_OK;
 299 }
 300
 301
 302 /*
 303   a wins name register with multiple WINS servers and multiple
 304   addresses to register. Try each WINS server in turn, until we get a
 305   reply for each address
 306 */
 307 struct nbt_name_register_wins_state {
 308         struct nbt_name_socket *nbtsock;
 309         struct nbt_name_register io;
 310         char **wins_servers;
 311         uint16_t wins_port;
 312         char **addresses;
 313         uint32_t address_idx;
 314 };
 315
 316 static void nbt_name_register_wins_handler(struct nbt_name_request *subreq);
 317
 318 /*
 319   the async send call for a multi-server WINS register
 320 */
 321 _PUBLIC_ struct tevent_req *nbt_name_register_wins_send(TALLOC_CTX *mem_ctx,
 322                                                 struct tevent_context *ev,
 323                                                 struct nbt_name_socket *nbtsock,
 324                                                 struct nbt_name_register_wins *io)
 325 {
 326         struct tevent_req *req;
 327         struct nbt_name_register_wins_state *state;
 328         struct nbt_name_request *subreq;
 329
 330         req = tevent_req_create(mem_ctx, &state,
 331                                 struct nbt_name_register_wins_state);
 332         if (req == NULL) {
 333                 return NULL;
 334         }
 335
 336         if (io->in.wins_servers == NULL) {
 337                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 338                 return tevent_req_post(req, ev);
 339         }
 340
 341         if (io->in.wins_servers[0] == NULL) {
 342                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 343                 return tevent_req_post(req, ev);
 344         }
 345
 346         if (io->in.addresses == NULL) {
 347                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 348                 return tevent_req_post(req, ev);
 349         }
 350
 351         if (io->in.addresses[0] == NULL) {
 352                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 353                 return tevent_req_post(req, ev);
 354         }
 355
 356         state->wins_port = io->in.wins_port;
 357         state->wins_servers = str_list_copy(state, io->in.wins_servers);
 358         if (tevent_req_nomem(state->wins_servers, req)) {
 359                 return tevent_req_post(req, ev);
 360         }
 361
 362         state->addresses = str_list_copy(state, io->in.addresses);
 363         if (tevent_req_nomem(state->addresses, req)) {
 364                 return tevent_req_post(req, ev);
 365         }
 366
 367         state->io.in.name            = io->in.name;
 368         state->io.in.dest_addr       = state->wins_servers[0];
 369         state->io.in.dest_port       = state->wins_port;
 370         state->io.in.address         = io->in.addresses[0];
 371         state->io.in.nb_flags        = io->in.nb_flags;
 372         state->io.in.broadcast       = false;
 373         state->io.in.register_demand = false;
 374         state->io.in.multi_homed     = (io->in.nb_flags & NBT_NM_GROUP)?false:true;
 375         state->io.in.ttl             = io->in.ttl;
 376         state->io.in.timeout         = 3;
 377         state->io.in.retries         = 2;
 378
 379         state->nbtsock     = nbtsock;
 380         state->address_idx = 0;
 381
 382         subreq = nbt_name_register_send(nbtsock, &state->io);
 383         if (tevent_req_nomem(subreq, req)) {
 384                 return tevent_req_post(req, ev);
 385         }
 386
 387         subreq->async.fn = nbt_name_register_wins_handler;
 388         subreq->async.private_data = req;
 389
 390         return req;
 391 }
 392
 393 /*
 394   state handler for WINS multi-homed multi-server name register
 395 */
 396 static void nbt_name_register_wins_handler(struct nbt_name_request *subreq)
 397 {
 398         struct tevent_req *req =
 399                 talloc_get_type_abort(subreq->async.private_data,
 400                 struct tevent_req);
 401         struct nbt_name_register_wins_state *state =
 402                 tevent_req_data(req,
 403                 struct nbt_name_register_wins_state);
 404         NTSTATUS status;
 405
 406         status = nbt_name_register_recv(subreq, state, &state->io);
 407         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 408                 /* the register timed out - try the next WINS server */
 409                 state->wins_servers++;
 410                 if (state->wins_servers[0] == NULL) {
 411                         tevent_req_nterror(req, status);
 412                         return;
 413                 }
 414
 415                 state->address_idx = 0;
 416                 state->io.in.dest_addr = state->wins_servers[0];
 417                 state->io.in.dest_port = state->wins_port;
 418                 state->io.in.address   = state->addresses[0];
 419
 420                 subreq = nbt_name_register_send(state->nbtsock, &state->io);
 421                 if (tevent_req_nomem(subreq, req)) {
 422                         return;
 423                 }
 424
 425                 subreq->async.fn = nbt_name_register_wins_handler;
 426                 subreq->async.private_data = req;
 427                 return;
 428         }
 429
 430         if (!NT_STATUS_IS_OK(status)) {
 431                 tevent_req_nterror(req, status);
 432                 return;
 433         }
 434
 435         if (state->io.out.rcode == 0 &&
 436             state->addresses[state->address_idx+1] != NULL) {
 437                 /* register our next address */
 438                 state->io.in.address = state->addresses[++(state->address_idx)];
 439
 440                 subreq = nbt_name_register_send(state->nbtsock, &state->io);
 441                 if (tevent_req_nomem(subreq, req)) {
 442                         return;
 443                 }
 444
 445                 subreq->async.fn = nbt_name_register_wins_handler;
 446                 subreq->async.private_data = req;
 447                 return;
 448         }
 449
 450         tevent_req_done(req);
 451 }
 452
 453 /*
 454   multi-homed WINS name register - recv side
 455 */
 456 _PUBLIC_ NTSTATUS nbt_name_register_wins_recv(struct tevent_req *req,
 457                                               TALLOC_CTX *mem_ctx,
 458                                               struct nbt_name_register_wins *io)
 459 {
 460         struct nbt_name_register_wins_state *state =
 461                 tevent_req_data(req,
 462                 struct nbt_name_register_wins_state);
 463         NTSTATUS status;
 464
 465         if (tevent_req_is_nterror(req, &status)) {
 466                 tevent_req_received(req);
 467                 return status;
 468         }
 469
 470         io->out.wins_server = talloc_move(mem_ctx, &state->wins_servers[0]);
 471         io->out.rcode = state->io.out.rcode;
 472
 473         tevent_req_received(req);
 474         return NT_STATUS_OK;
 475 }
 476
 477 /*
 478   multi-homed WINS register - sync interface
 479 */
 480 _PUBLIC_ NTSTATUS nbt_name_register_wins(struct nbt_name_socket *nbtsock,
 481                                 TALLOC_CTX *mem_ctx,
 482                                 struct nbt_name_register_wins *io)
 483 {
 484         TALLOC_CTX *frame = talloc_stackframe();
 485         struct tevent_context *ev;
 486         struct tevent_req *subreq;
 487         NTSTATUS status;
 488
 489         /*
 490          * TODO: create a temporary event context
 491          */
 492         ev = nbtsock->event_ctx;
 493
 494         subreq = nbt_name_register_wins_send(frame, ev, nbtsock, io);
 495         if (subreq == NULL) {
 496                 talloc_free(frame);
 497                 return NT_STATUS_NO_MEMORY;
 498         }
 499
 500         if (!tevent_req_poll(subreq, ev)) {
 501                 status = map_nt_error_from_unix_common(errno);
 502                 talloc_free(frame);
 503                 return status;
 504         }
 505
 506         status = nbt_name_register_wins_recv(subreq, mem_ctx, io);
 507         if (!NT_STATUS_IS_OK(status)) {
 508                 talloc_free(frame);
 509                 return status;
 510         }
 511
 512         TALLOC_FREE(frame);
 513         return NT_STATUS_OK;
 514 }