source3/libsmb/smbsock_connect.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Connect to 445 and 139/nbsesssetup
   4    Copyright (C) Volker Lendecke 2010
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "../lib/async_req/async_sock.h"
  22 #include "../lib/util/tevent_ntstatus.h"
  23 #include "../lib/util/tevent_unix.h"
  24 #include "client.h"
  25 #include "async_smb.h"
  26 #include "../libcli/smb/read_smb.h"
  27 #include "libsmb/nmblib.h"
  28
  29 struct cli_session_request_state {
  30         struct tevent_context *ev;
  31         int sock;
  32         uint32 len_hdr;
  33         struct iovec iov[3];
  34         uint8_t nb_session_response;
  35 };
  36
  37 static void cli_session_request_sent(struct tevent_req *subreq);
  38 static void cli_session_request_recvd(struct tevent_req *subreq);
  39
  40 static struct tevent_req *cli_session_request_send(TALLOC_CTX *mem_ctx,
  41                                         struct tevent_context *ev,
  42                                         int sock,
  43                                         const struct nmb_name *called,
  44                                         const struct nmb_name *calling)
  45 {
  46         struct tevent_req *req, *subreq;
  47         struct cli_session_request_state *state;
  48
  49         req = tevent_req_create(mem_ctx, &state,
  50                                 struct cli_session_request_state);
  51         if (req == NULL) {
  52                 return NULL;
  53         }
  54         state->ev = ev;
  55         state->sock = sock;
  56
  57         state->iov[1].iov_base = name_mangle(
  58                 state, called->name, called->name_type);
  59         if (tevent_req_nomem(state->iov[1].iov_base, req)) {
  60                 return tevent_req_post(req, ev);
  61         }
  62         state->iov[1].iov_len = name_len(
  63                 (unsigned char *)state->iov[1].iov_base,
  64                 talloc_get_size(state->iov[1].iov_base));
  65
  66         state->iov[2].iov_base = name_mangle(
  67                 state, calling->name, calling->name_type);
  68         if (tevent_req_nomem(state->iov[2].iov_base, req)) {
  69                 return tevent_req_post(req, ev);
  70         }
  71         state->iov[2].iov_len = name_len(
  72                 (unsigned char *)state->iov[2].iov_base,
  73                 talloc_get_size(state->iov[2].iov_base));
  74
  75         _smb_setlen(((char *)&state->len_hdr),
  76                     state->iov[1].iov_len + state->iov[2].iov_len);
  77         SCVAL((char *)&state->len_hdr, 0, 0x81);
  78
  79         state->iov[0].iov_base = &state->len_hdr;
  80         state->iov[0].iov_len = sizeof(state->len_hdr);
  81
  82         subreq = writev_send(state, ev, NULL, sock, true, state->iov, 3);
  83         if (tevent_req_nomem(subreq, req)) {
  84                 return tevent_req_post(req, ev);
  85         }
  86         tevent_req_set_callback(subreq, cli_session_request_sent, req);
  87         return req;
  88 }
  89
  90 static void cli_session_request_sent(struct tevent_req *subreq)
  91 {
  92         struct tevent_req *req = tevent_req_callback_data(
  93                 subreq, struct tevent_req);
  94         struct cli_session_request_state *state = tevent_req_data(
  95                 req, struct cli_session_request_state);
  96         ssize_t ret;
  97         int err;
  98
  99         ret = writev_recv(subreq, &err);
 100         TALLOC_FREE(subreq);
 101         if (ret == -1) {
 102                 tevent_req_error(req, err);
 103                 return;
 104         }
 105         subreq = read_smb_send(state, state->ev, state->sock);
 106         if (tevent_req_nomem(subreq, req)) {
 107                 return;
 108         }
 109         tevent_req_set_callback(subreq, cli_session_request_recvd, req);
 110 }
 111
 112 static void cli_session_request_recvd(struct tevent_req *subreq)
 113 {
 114         struct tevent_req *req = tevent_req_callback_data(
 115                 subreq, struct tevent_req);
 116         struct cli_session_request_state *state = tevent_req_data(
 117                 req, struct cli_session_request_state);
 118         uint8_t *buf;
 119         ssize_t ret;
 120         int err;
 121
 122         ret = read_smb_recv(subreq, talloc_tos(), &buf, &err);
 123         TALLOC_FREE(subreq);
 124
 125         if (ret < 4) {
 126                 ret = -1;
 127                 err = EIO;
 128         }
 129         if (ret == -1) {
 130                 tevent_req_error(req, err);
 131                 return;
 132         }
 133         /*
 134          * In case of an error there is more information in the data
 135          * portion according to RFC1002. We're not subtle enough to
 136          * respond to the different error conditions, so drop the
 137          * error info here.
 138          */
 139         state->nb_session_response = CVAL(buf, 0);
 140         tevent_req_done(req);
 141 }
 142
 143 static bool cli_session_request_recv(struct tevent_req *req, int *err, uint8_t *resp)
 144 {
 145         struct cli_session_request_state *state = tevent_req_data(
 146                 req, struct cli_session_request_state);
 147
 148         if (tevent_req_is_unix_error(req, err)) {
 149                 return false;
 150         }
 151         *resp = state->nb_session_response;
 152         return true;
 153 }
 154
 155 struct nb_connect_state {
 156         struct tevent_context *ev;
 157         const struct sockaddr_storage *addr;
 158         const char *called_name;
 159         int sock;
 160
 161         struct nmb_name called;
 162         struct nmb_name calling;
 163 };
 164
 165 static int nb_connect_state_destructor(struct nb_connect_state *state);
 166 static void nb_connect_connected(struct tevent_req *subreq);
 167 static void nb_connect_done(struct tevent_req *subreq);
 168
 169 static struct tevent_req *nb_connect_send(TALLOC_CTX *mem_ctx,
 170                                           struct tevent_context *ev,
 171                                           const struct sockaddr_storage *addr,
 172                                           const char *called_name,
 173                                           int called_type,
 174                                           const char *calling_name,
 175                                           int calling_type)
 176 {
 177         struct tevent_req *req, *subreq;
 178         struct nb_connect_state *state;
 179
 180         req = tevent_req_create(mem_ctx, &state, struct nb_connect_state);
 181         if (req == NULL) {
 182                 return NULL;
 183         }
 184         state->ev = ev;
 185         state->called_name = called_name;
 186         state->addr = addr;
 187
 188         state->sock = -1;
 189         make_nmb_name(&state->called, called_name, called_type);
 190         make_nmb_name(&state->calling, calling_name, calling_type);
 191
 192         talloc_set_destructor(state, nb_connect_state_destructor);
 193
 194         subreq = open_socket_out_send(state, ev, addr, NBT_SMB_PORT, 5000);
 195         if (tevent_req_nomem(subreq, req)) {
 196                 return tevent_req_post(req, ev);
 197         }
 198         tevent_req_set_callback(subreq, nb_connect_connected, req);
 199         return req;
 200 }
 201
 202 static int nb_connect_state_destructor(struct nb_connect_state *state)
 203 {
 204         if (state->sock != -1) {
 205                 close(state->sock);
 206         }
 207         return 0;
 208 }
 209
 210 static void nb_connect_connected(struct tevent_req *subreq)
 211 {
 212         struct tevent_req *req = tevent_req_callback_data(
 213                 subreq, struct tevent_req);
 214         struct nb_connect_state *state = tevent_req_data(
 215                 req, struct nb_connect_state);
 216         NTSTATUS status;
 217
 218         status = open_socket_out_recv(subreq, &state->sock);
 219         TALLOC_FREE(subreq);
 220         if (!NT_STATUS_IS_OK(status)) {
 221                 tevent_req_nterror(req, status);
 222                 return;
 223         }
 224         subreq = cli_session_request_send(state, state->ev, state->sock,
 225                                           &state->called, &state->calling);
 226         if (tevent_req_nomem(subreq, req)) {
 227                 return;
 228         }
 229         tevent_req_set_callback(subreq, nb_connect_done, req);
 230 }
 231
 232 static void nb_connect_done(struct tevent_req *subreq)
 233 {
 234         struct tevent_req *req = tevent_req_callback_data(
 235                 subreq, struct tevent_req);
 236         struct nb_connect_state *state = tevent_req_data(
 237                 req, struct nb_connect_state);
 238         bool ret;
 239         int err;
 240         uint8_t resp;
 241
 242         ret = cli_session_request_recv(subreq, &err, &resp);
 243         TALLOC_FREE(subreq);
 244         if (!ret) {
 245                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 246                 return;
 247         }
 248
 249         /*
 250          * RFC1002: 0x82 - POSITIVE SESSION RESPONSE
 251          */
 252
 253         if (resp != 0x82) {
 254                 /*
 255                  * The server did not like our session request
 256                  */
 257                 close(state->sock);
 258                 state->sock = -1;
 259
 260                 if (strequal(state->called_name, "*SMBSERVER")) {
 261                         /*
 262                          * Here we could try a name status request and
 263                          * use the first 0x20 type name.
 264                          */
 265                         tevent_req_nterror(
 266                                 req, NT_STATUS_RESOURCE_NAME_NOT_FOUND);
 267                         return;
 268                 }
 269
 270                 /*
 271                  * We could be subtle and distinguish between
 272                  * different failure modes, but what we do here
 273                  * instead is just retry with *SMBSERVER type 0x20.
 274                  */
 275                 state->called_name = "*SMBSERVER";
 276                 make_nmb_name(&state->called, state->called_name, 0x20);
 277
 278                 subreq = open_socket_out_send(state, state->ev, state->addr,
 279                                               NBT_SMB_PORT, 5000);
 280                 if (tevent_req_nomem(subreq, req)) {
 281                         return;
 282                 }
 283                 tevent_req_set_callback(subreq, nb_connect_connected, req);
 284                 return;
 285         }
 286
 287         tevent_req_done(req);
 288         return;
 289
 290 }
 291
 292 static NTSTATUS nb_connect_recv(struct tevent_req *req, int *sock)
 293 {
 294         struct nb_connect_state *state = tevent_req_data(
 295                 req, struct nb_connect_state);
 296         NTSTATUS status;
 297
 298         if (tevent_req_is_nterror(req, &status)) {
 299                 return status;
 300         }
 301         *sock = state->sock;
 302         state->sock = -1;
 303         return NT_STATUS_OK;
 304 }
 305
 306 struct smbsock_connect_state {
 307         struct tevent_context *ev;
 308         const struct sockaddr_storage *addr;
 309         const char *called_name;
 310         uint8_t called_type;
 311         const char *calling_name;
 312         uint8_t calling_type;
 313         struct tevent_req *req_139;
 314         struct tevent_req *req_445;
 315         int sock;
 316         uint16_t port;
 317 };
 318
 319 static int smbsock_connect_state_destructor(
 320         struct smbsock_connect_state *state);
 321 static void smbsock_connect_connected(struct tevent_req *subreq);
 322 static void smbsock_connect_do_139(struct tevent_req *subreq);
 323
 324 struct tevent_req *smbsock_connect_send(TALLOC_CTX *mem_ctx,
 325                                         struct tevent_context *ev,
 326                                         const struct sockaddr_storage *addr,
 327                                         uint16_t port,
 328                                         const char *called_name,
 329                                         int called_type,
 330                                         const char *calling_name,
 331                                         int calling_type)
 332 {
 333         struct tevent_req *req;
 334         struct smbsock_connect_state *state;
 335
 336         req = tevent_req_create(mem_ctx, &state, struct smbsock_connect_state);
 337         if (req == NULL) {
 338                 return NULL;
 339         }
 340         state->ev = ev;
 341         state->addr = addr;
 342         state->sock = -1;
 343         state->called_name =
 344                 (called_name != NULL) ? called_name : "*SMBSERVER";
 345         state->called_type =
 346                 (called_type != -1) ? called_type : 0x20;
 347         state->calling_name =
 348                 (calling_name != NULL) ? calling_name : lp_netbios_name();
 349         state->calling_type =
 350                 (calling_type != -1) ? calling_type : 0x00;
 351
 352         talloc_set_destructor(state, smbsock_connect_state_destructor);
 353
 354         if (port == NBT_SMB_PORT) {
 355                 state->req_139 = nb_connect_send(state, state->ev, state->addr,
 356                                                  state->called_name,
 357                                                  state->called_type,
 358                                                  state->calling_name,
 359                                                  state->calling_type);
 360                 if (tevent_req_nomem(state->req_139, req)) {
 361                         return tevent_req_post(req, ev);
 362                 }
 363                 tevent_req_set_callback(
 364                         state->req_139, smbsock_connect_connected, req);
 365                 return req;
 366         }
 367         if (port != 0) {
 368                 state->req_445 = open_socket_out_send(state, ev, addr, port,
 369                                                       5000);
 370                 if (tevent_req_nomem(state->req_445, req)) {
 371                         return tevent_req_post(req, ev);
 372                 }
 373                 tevent_req_set_callback(
 374                         state->req_445, smbsock_connect_connected, req);
 375                 return req;
 376         }
 377
 378         /*
 379          * port==0, try both
 380          */
 381
 382         state->req_445 = open_socket_out_send(state, ev, addr, TCP_SMB_PORT, 5000);
 383         if (tevent_req_nomem(state->req_445, req)) {
 384                 return tevent_req_post(req, ev);
 385         }
 386         tevent_req_set_callback(state->req_445, smbsock_connect_connected,
 387                                 req);
 388
 389         /*
 390          * After 5 msecs, fire the 139 (NBT) request
 391          */
 392         state->req_139 = tevent_wakeup_send(
 393                 state, ev, timeval_current_ofs(0, 5000));
 394         if (tevent_req_nomem(state->req_139, req)) {
 395                 TALLOC_FREE(state->req_445);
 396                 return tevent_req_post(req, ev);
 397         }
 398         tevent_req_set_callback(state->req_139, smbsock_connect_do_139,
 399                                 req);
 400         return req;
 401 }
 402
 403 static int smbsock_connect_state_destructor(
 404         struct smbsock_connect_state *state)
 405 {
 406         if (state->sock != -1) {
 407                 close(state->sock);
 408                 state->sock = -1;
 409         }
 410         return 0;
 411 }
 412
 413 static void smbsock_connect_do_139(struct tevent_req *subreq)
 414 {
 415         struct tevent_req *req = tevent_req_callback_data(
 416                 subreq, struct tevent_req);
 417         struct smbsock_connect_state *state = tevent_req_data(
 418                 req, struct smbsock_connect_state);
 419         bool ret;
 420
 421         ret = tevent_wakeup_recv(subreq);
 422         TALLOC_FREE(subreq);
 423         if (!ret) {
 424                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 425                 return;
 426         }
 427         state->req_139 = nb_connect_send(state, state->ev, state->addr,
 428                                          state->called_name,
 429                                          state->called_type,
 430                                          state->calling_name,
 431                                          state->calling_type);
 432         if (tevent_req_nomem(state->req_139, req)) {
 433                 return;
 434         }
 435         tevent_req_set_callback(state->req_139, smbsock_connect_connected,
 436                                 req);
 437 }
 438
 439 static void smbsock_connect_connected(struct tevent_req *subreq)
 440 {
 441         struct tevent_req *req = tevent_req_callback_data(
 442                 subreq, struct tevent_req);
 443         struct smbsock_connect_state *state = tevent_req_data(
 444                 req, struct smbsock_connect_state);
 445         struct tevent_req *unfinished_req;
 446         NTSTATUS status;
 447
 448         if (subreq == state->req_445) {
 449
 450                 status = open_socket_out_recv(subreq, &state->sock);
 451                 TALLOC_FREE(state->req_445);
 452                 unfinished_req = state->req_139;
 453                 state->port = TCP_SMB_PORT;
 454
 455         } else if (subreq == state->req_139) {
 456
 457                 status = nb_connect_recv(subreq, &state->sock);
 458                 TALLOC_FREE(state->req_139);
 459                 unfinished_req = state->req_445;
 460                 state->port = NBT_SMB_PORT;
 461
 462         } else {
 463                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 464                 return;
 465         }
 466
 467         if (NT_STATUS_IS_OK(status)) {
 468                 TALLOC_FREE(unfinished_req);
 469                 state->req_139 = NULL;
 470                 state->req_445 = NULL;
 471                 tevent_req_done(req);
 472                 return;
 473         }
 474         if (unfinished_req == NULL) {
 475                 /*
 476                  * Both requests failed
 477                  */
 478                 tevent_req_nterror(req, status);
 479                 return;
 480         }
 481         /*
 482          * Do nothing, wait for the second request to come here.
 483          */
 484 }
 485
 486 NTSTATUS smbsock_connect_recv(struct tevent_req *req, int *sock,
 487                               uint16_t *ret_port)
 488 {
 489         struct smbsock_connect_state *state = tevent_req_data(
 490                 req, struct smbsock_connect_state);
 491         NTSTATUS status;
 492
 493         if (tevent_req_is_nterror(req, &status)) {
 494                 return status;
 495         }
 496         *sock = state->sock;
 497         state->sock = -1;
 498         if (ret_port != NULL) {
 499                 *ret_port = state->port;
 500         }
 501         return NT_STATUS_OK;
 502 }
 503
 504 NTSTATUS smbsock_connect(const struct sockaddr_storage *addr, uint16_t port,
 505                          const char *called_name, int called_type,
 506                          const char *calling_name, int calling_type,
 507                          int *pfd, uint16_t *ret_port, int sec_timeout)
 508 {
 509         TALLOC_CTX *frame = talloc_stackframe();
 510         struct tevent_context *ev;
 511         struct tevent_req *req;
 512         NTSTATUS status = NT_STATUS_NO_MEMORY;
 513
 514         ev = samba_tevent_context_init(frame);
 515         if (ev == NULL) {
 516                 goto fail;
 517         }
 518         req = smbsock_connect_send(frame, ev, addr, port,
 519                                    called_name, called_type,
 520                                    calling_name, calling_type);
 521         if (req == NULL) {
 522                 goto fail;
 523         }
 524         if ((sec_timeout != 0) &&
 525             !tevent_req_set_endtime(
 526                     req, ev, timeval_current_ofs(sec_timeout, 0))) {
 527                 goto fail;
 528         }
 529         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 530                 goto fail;
 531         }
 532         status = smbsock_connect_recv(req, pfd, ret_port);
 533  fail:
 534         TALLOC_FREE(frame);
 535         return status;
 536 }
 537
 538 struct smbsock_any_connect_state {
 539         struct tevent_context *ev;
 540         const struct sockaddr_storage *addrs;
 541         const char **called_names;
 542         int *called_types;
 543         const char **calling_names;
 544         int *calling_types;
 545         size_t num_addrs;
 546         uint16_t port;
 547
 548         struct tevent_req **requests;
 549         size_t num_sent;
 550         size_t num_received;
 551
 552         int fd;
 553         uint16_t chosen_port;
 554         size_t chosen_index;
 555 };
 556
 557 static bool smbsock_any_connect_send_next(
 558         struct tevent_req *req, struct smbsock_any_connect_state *state);
 559 static void smbsock_any_connect_trynext(struct tevent_req *subreq);
 560 static void smbsock_any_connect_connected(struct tevent_req *subreq);
 561
 562 struct tevent_req *smbsock_any_connect_send(TALLOC_CTX *mem_ctx,
 563                                             struct tevent_context *ev,
 564                                             const struct sockaddr_storage *addrs,
 565                                             const char **called_names,
 566                                             int *called_types,
 567                                             const char **calling_names,
 568                                             int *calling_types,
 569                                             size_t num_addrs, uint16_t port)
 570 {
 571         struct tevent_req *req, *subreq;
 572         struct smbsock_any_connect_state *state;
 573
 574         req = tevent_req_create(mem_ctx, &state,
 575                                 struct smbsock_any_connect_state);
 576         if (req == NULL) {
 577                 return NULL;
 578         }
 579         state->ev = ev;
 580         state->addrs = addrs;
 581         state->num_addrs = num_addrs;
 582         state->called_names = called_names;
 583         state->called_types = called_types;
 584         state->calling_names = calling_names;
 585         state->calling_types = calling_types;
 586         state->port = port;
 587
 588         if (num_addrs == 0) {
 589                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 590                 return tevent_req_post(req, ev);
 591         }
 592
 593         state->requests = talloc_zero_array(state, struct tevent_req *,
 594                                             num_addrs);
 595         if (tevent_req_nomem(state->requests, req)) {
 596                 return tevent_req_post(req, ev);
 597         }
 598         if (!smbsock_any_connect_send_next(req, state)) {
 599                 return tevent_req_post(req, ev);
 600         }
 601         if (state->num_sent >= state->num_addrs) {
 602                 return req;
 603         }
 604         subreq = tevent_wakeup_send(state, ev, timeval_current_ofs(0, 10000));
 605         if (tevent_req_nomem(subreq, req)) {
 606                 return tevent_req_post(req, ev);
 607         }
 608         tevent_req_set_callback(subreq, smbsock_any_connect_trynext, req);
 609         return req;
 610 }
 611
 612 static void smbsock_any_connect_trynext(struct tevent_req *subreq)
 613 {
 614         struct tevent_req *req = tevent_req_callback_data(
 615                 subreq, struct tevent_req);
 616         struct smbsock_any_connect_state *state = tevent_req_data(
 617                 req, struct smbsock_any_connect_state);
 618         bool ret;
 619
 620         ret = tevent_wakeup_recv(subreq);
 621         TALLOC_FREE(subreq);
 622         if (!ret) {
 623                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 624                 return;
 625         }
 626         if (!smbsock_any_connect_send_next(req, state)) {
 627                 return;
 628         }
 629         if (state->num_sent >= state->num_addrs) {
 630                 return;
 631         }
 632         subreq = tevent_wakeup_send(state, state->ev,
 633                                     tevent_timeval_set(0, 10000));
 634         if (tevent_req_nomem(subreq, req)) {
 635                 return;
 636         }
 637         tevent_req_set_callback(subreq, smbsock_any_connect_trynext, req);
 638 }
 639
 640 static bool smbsock_any_connect_send_next(
 641         struct tevent_req *req, struct smbsock_any_connect_state *state)
 642 {
 643         struct tevent_req *subreq;
 644
 645         if (state->num_sent >= state->num_addrs) {
 646                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 647                 return false;
 648         }
 649         subreq = smbsock_connect_send(
 650                 state->requests, state->ev, &state->addrs[state->num_sent],
 651                 state->port,
 652                 (state->called_names != NULL)
 653                 ? state->called_names[state->num_sent] : NULL,
 654                 (state->called_types != NULL)
 655                 ? state->called_types[state->num_sent] : -1,
 656                 (state->calling_names != NULL)
 657                 ? state->calling_names[state->num_sent] : NULL,
 658                 (state->calling_types != NULL)
 659                 ? state->calling_types[state->num_sent] : -1);
 660         if (tevent_req_nomem(subreq, req)) {
 661                 return false;
 662         }
 663         tevent_req_set_callback(subreq, smbsock_any_connect_connected, req);
 664
 665         state->requests[state->num_sent] = subreq;
 666         state->num_sent += 1;
 667
 668         return true;
 669 }
 670
 671 static void smbsock_any_connect_connected(struct tevent_req *subreq)
 672 {
 673         struct tevent_req *req = tevent_req_callback_data(
 674                 subreq, struct tevent_req);
 675         struct smbsock_any_connect_state *state = tevent_req_data(
 676                 req, struct smbsock_any_connect_state);
 677         NTSTATUS status;
 678         int fd;
 679         uint16_t chosen_port;
 680         size_t i;
 681         size_t chosen_index = 0;
 682
 683         for (i=0; i<state->num_sent; i++) {
 684                 if (state->requests[i] == subreq) {
 685                         chosen_index = i;
 686                         break;
 687                 }
 688         }
 689         if (i == state->num_sent) {
 690                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 691                 return;
 692         }
 693
 694         status = smbsock_connect_recv(subreq, &fd, &chosen_port);
 695
 696         TALLOC_FREE(subreq);
 697         state->requests[chosen_index] = NULL;
 698
 699         if (NT_STATUS_IS_OK(status)) {
 700                 /*
 701                  * This will kill all the other requests
 702                  */
 703                 TALLOC_FREE(state->requests);
 704                 state->fd = fd;
 705                 state->chosen_port = chosen_port;
 706                 state->chosen_index = chosen_index;
 707                 tevent_req_done(req);
 708                 return;
 709         }
 710
 711         state->num_received += 1;
 712         if (state->num_received < state->num_addrs) {
 713                 /*
 714                  * More addrs pending, wait for the others
 715                  */
 716                 return;
 717         }
 718
 719         /*
 720          * This is the last response, none succeeded.
 721          */
 722         tevent_req_nterror(req, status);
 723         return;
 724 }
 725
 726 NTSTATUS smbsock_any_connect_recv(struct tevent_req *req, int *pfd,
 727                                   size_t *chosen_index,
 728                                   uint16_t *chosen_port)
 729 {
 730         struct smbsock_any_connect_state *state = tevent_req_data(
 731                 req, struct smbsock_any_connect_state);
 732         NTSTATUS status;
 733
 734         if (tevent_req_is_nterror(req, &status)) {
 735                 return status;
 736         }
 737         *pfd = state->fd;
 738         if (chosen_index != NULL) {
 739                 *chosen_index = state->chosen_index;
 740         }
 741         if (chosen_port != NULL) {
 742                 *chosen_port = state->chosen_port;
 743         }
 744         return NT_STATUS_OK;
 745 }
 746
 747 NTSTATUS smbsock_any_connect(const struct sockaddr_storage *addrs,
 748                              const char **called_names,
 749                              int *called_types,
 750                              const char **calling_names,
 751                              int *calling_types,
 752                              size_t num_addrs,
 753                              uint16_t port,
 754                              int sec_timeout,
 755                              int *pfd, size_t *chosen_index,
 756                              uint16_t *chosen_port)
 757 {
 758         TALLOC_CTX *frame = talloc_stackframe();
 759         struct tevent_context *ev;
 760         struct tevent_req *req;
 761         NTSTATUS status = NT_STATUS_NO_MEMORY;
 762
 763         ev = samba_tevent_context_init(frame);
 764         if (ev == NULL) {
 765                 goto fail;
 766         }
 767         req = smbsock_any_connect_send(frame, ev, addrs,
 768                                        called_names, called_types,
 769                                        calling_names, calling_types,
 770                                        num_addrs, port);
 771         if (req == NULL) {
 772                 goto fail;
 773         }
 774         if ((sec_timeout != 0) &&
 775             !tevent_req_set_endtime(
 776                     req, ev, timeval_current_ofs(sec_timeout, 0))) {
 777                 goto fail;
 778         }
 779         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 780                 goto fail;
 781         }
 782         status = smbsock_any_connect_recv(req, pfd, chosen_index, chosen_port);
 783  fail:
 784         TALLOC_FREE(frame);
 785         return status;
 786 }