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_t 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         struct tevent_req *session_subreq;
 161         struct nmb_name called;
 162         struct nmb_name calling;
 163 };
 164
 165 static void nb_connect_cleanup(struct tevent_req *req,
 166                                enum tevent_req_state req_state);
 167 static void nb_connect_connected(struct tevent_req *subreq);
 168 static void nb_connect_done(struct tevent_req *subreq);
 169
 170 static struct tevent_req *nb_connect_send(TALLOC_CTX *mem_ctx,
 171                                           struct tevent_context *ev,
 172                                           const struct sockaddr_storage *addr,
 173                                           const char *called_name,
 174                                           int called_type,
 175                                           const char *calling_name,
 176                                           int calling_type)
 177 {
 178         struct tevent_req *req, *subreq;
 179         struct nb_connect_state *state;
 180
 181         req = tevent_req_create(mem_ctx, &state, struct nb_connect_state);
 182         if (req == NULL) {
 183                 return NULL;
 184         }
 185         state->ev = ev;
 186         state->called_name = called_name;
 187         state->addr = addr;
 188
 189         state->sock = -1;
 190         make_nmb_name(&state->called, called_name, called_type);
 191         make_nmb_name(&state->calling, calling_name, calling_type);
 192
 193         tevent_req_set_cleanup_fn(req, nb_connect_cleanup);
 194
 195         subreq = open_socket_out_send(state, ev, addr, NBT_SMB_PORT, 5000);
 196         if (tevent_req_nomem(subreq, req)) {
 197                 return tevent_req_post(req, ev);
 198         }
 199         tevent_req_set_callback(subreq, nb_connect_connected, req);
 200         return req;
 201 }
 202
 203 static void nb_connect_cleanup(struct tevent_req *req,
 204                                enum tevent_req_state req_state)
 205 {
 206         struct nb_connect_state *state = tevent_req_data(
 207                 req, struct nb_connect_state);
 208
 209         /*
 210          * we need to free a pending request before closing the
 211          * socket, see bug #11141
 212          */
 213         TALLOC_FREE(state->session_subreq);
 214
 215         if (req_state == TEVENT_REQ_DONE) {
 216                 /*
 217                  * we keep the socket open for the caller to use
 218                  */
 219                 return;
 220         }
 221
 222         if (state->sock != -1) {
 223                 close(state->sock);
 224                 state->sock = -1;
 225         }
 226
 227         return;
 228 }
 229
 230 static void nb_connect_connected(struct tevent_req *subreq)
 231 {
 232         struct tevent_req *req = tevent_req_callback_data(
 233                 subreq, struct tevent_req);
 234         struct nb_connect_state *state = tevent_req_data(
 235                 req, struct nb_connect_state);
 236         NTSTATUS status;
 237
 238         status = open_socket_out_recv(subreq, &state->sock);
 239         TALLOC_FREE(subreq);
 240         if (tevent_req_nterror(req, status)) {
 241                 return;
 242         }
 243         subreq = cli_session_request_send(state, state->ev, state->sock,
 244                                           &state->called, &state->calling);
 245         if (tevent_req_nomem(subreq, req)) {
 246                 return;
 247         }
 248         tevent_req_set_callback(subreq, nb_connect_done, req);
 249         state->session_subreq = subreq;
 250 }
 251
 252 static void nb_connect_done(struct tevent_req *subreq)
 253 {
 254         struct tevent_req *req = tevent_req_callback_data(
 255                 subreq, struct tevent_req);
 256         struct nb_connect_state *state = tevent_req_data(
 257                 req, struct nb_connect_state);
 258         bool ret;
 259         int err;
 260         uint8_t resp;
 261
 262         state->session_subreq = NULL;
 263
 264         ret = cli_session_request_recv(subreq, &err, &resp);
 265         TALLOC_FREE(subreq);
 266         if (!ret) {
 267                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 268                 return;
 269         }
 270
 271         /*
 272          * RFC1002: 0x82 - POSITIVE SESSION RESPONSE
 273          */
 274
 275         if (resp != 0x82) {
 276                 /*
 277                  * The server did not like our session request
 278                  */
 279                 close(state->sock);
 280                 state->sock = -1;
 281
 282                 if (strequal(state->called_name, "*SMBSERVER")) {
 283                         /*
 284                          * Here we could try a name status request and
 285                          * use the first 0x20 type name.
 286                          */
 287                         tevent_req_nterror(
 288                                 req, NT_STATUS_RESOURCE_NAME_NOT_FOUND);
 289                         return;
 290                 }
 291
 292                 /*
 293                  * We could be subtle and distinguish between
 294                  * different failure modes, but what we do here
 295                  * instead is just retry with *SMBSERVER type 0x20.
 296                  */
 297                 state->called_name = "*SMBSERVER";
 298                 make_nmb_name(&state->called, state->called_name, 0x20);
 299
 300                 subreq = open_socket_out_send(state, state->ev, state->addr,
 301                                               NBT_SMB_PORT, 5000);
 302                 if (tevent_req_nomem(subreq, req)) {
 303                         return;
 304                 }
 305                 tevent_req_set_callback(subreq, nb_connect_connected, req);
 306                 return;
 307         }
 308
 309         tevent_req_done(req);
 310         return;
 311 }
 312
 313 static NTSTATUS nb_connect_recv(struct tevent_req *req, int *sock)
 314 {
 315         struct nb_connect_state *state = tevent_req_data(
 316                 req, struct nb_connect_state);
 317         NTSTATUS status;
 318
 319         if (tevent_req_is_nterror(req, &status)) {
 320                 tevent_req_received(req);
 321                 return status;
 322         }
 323         *sock = state->sock;
 324         state->sock = -1;
 325         tevent_req_received(req);
 326         return NT_STATUS_OK;
 327 }
 328
 329 struct smbsock_connect_state {
 330         struct tevent_context *ev;
 331         const struct sockaddr_storage *addr;
 332         const char *called_name;
 333         uint8_t called_type;
 334         const char *calling_name;
 335         uint8_t calling_type;
 336         struct tevent_req *req_139;
 337         struct tevent_req *req_445;
 338         int sock;
 339         uint16_t port;
 340 };
 341
 342 static void smbsock_connect_cleanup(struct tevent_req *req,
 343                                     enum tevent_req_state req_state);
 344 static void smbsock_connect_connected(struct tevent_req *subreq);
 345 static void smbsock_connect_do_139(struct tevent_req *subreq);
 346
 347 struct tevent_req *smbsock_connect_send(TALLOC_CTX *mem_ctx,
 348                                         struct tevent_context *ev,
 349                                         const struct sockaddr_storage *addr,
 350                                         uint16_t port,
 351                                         const char *called_name,
 352                                         int called_type,
 353                                         const char *calling_name,
 354                                         int calling_type)
 355 {
 356         struct tevent_req *req;
 357         struct smbsock_connect_state *state;
 358
 359         req = tevent_req_create(mem_ctx, &state, struct smbsock_connect_state);
 360         if (req == NULL) {
 361                 return NULL;
 362         }
 363         state->ev = ev;
 364         state->addr = addr;
 365         state->sock = -1;
 366         state->called_name =
 367                 (called_name != NULL) ? called_name : "*SMBSERVER";
 368         state->called_type =
 369                 (called_type != -1) ? called_type : 0x20;
 370         state->calling_name =
 371                 (calling_name != NULL) ? calling_name : lp_netbios_name();
 372         state->calling_type =
 373                 (calling_type != -1) ? calling_type : 0x00;
 374
 375         tevent_req_set_cleanup_fn(req, smbsock_connect_cleanup);
 376
 377         if (port == NBT_SMB_PORT) {
 378                 if (lp_disable_netbios()) {
 379                         tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 380                         return tevent_req_post(req, ev);
 381                 }
 382
 383                 state->req_139 = nb_connect_send(state, state->ev, state->addr,
 384                                                  state->called_name,
 385                                                  state->called_type,
 386                                                  state->calling_name,
 387                                                  state->calling_type);
 388                 if (tevent_req_nomem(state->req_139, req)) {
 389                         return tevent_req_post(req, ev);
 390                 }
 391                 tevent_req_set_callback(
 392                         state->req_139, smbsock_connect_connected, req);
 393                 return req;
 394         }
 395         if (port != 0) {
 396                 state->req_445 = open_socket_out_send(state, ev, addr, port,
 397                                                       5000);
 398                 if (tevent_req_nomem(state->req_445, req)) {
 399                         return tevent_req_post(req, ev);
 400                 }
 401                 tevent_req_set_callback(
 402                         state->req_445, smbsock_connect_connected, req);
 403                 return req;
 404         }
 405
 406         /*
 407          * port==0, try both
 408          */
 409
 410         state->req_445 = open_socket_out_send(state, ev, addr, TCP_SMB_PORT, 5000);
 411         if (tevent_req_nomem(state->req_445, req)) {
 412                 return tevent_req_post(req, ev);
 413         }
 414         tevent_req_set_callback(state->req_445, smbsock_connect_connected,
 415                                 req);
 416
 417         /*
 418          * Check for disable_netbios
 419          */
 420         if (lp_disable_netbios()) {
 421                 return req;
 422         }
 423
 424         /*
 425          * After 5 msecs, fire the 139 (NBT) request
 426          */
 427         state->req_139 = tevent_wakeup_send(
 428                 state, ev, timeval_current_ofs(0, 5000));
 429         if (tevent_req_nomem(state->req_139, req)) {
 430                 TALLOC_FREE(state->req_445);
 431                 return tevent_req_post(req, ev);
 432         }
 433         tevent_req_set_callback(state->req_139, smbsock_connect_do_139,
 434                                 req);
 435         return req;
 436 }
 437
 438 static void smbsock_connect_cleanup(struct tevent_req *req,
 439                                     enum tevent_req_state req_state)
 440 {
 441         struct smbsock_connect_state *state = tevent_req_data(
 442                 req, struct smbsock_connect_state);
 443
 444         /*
 445          * we need to free a pending request before closing the
 446          * socket, see bug #11141
 447          */
 448         TALLOC_FREE(state->req_445);
 449         TALLOC_FREE(state->req_139);
 450
 451         if (req_state == TEVENT_REQ_DONE) {
 452                 /*
 453                  * we keep the socket open for the caller to use
 454                  */
 455                 return;
 456         }
 457
 458         if (state->sock != -1) {
 459                 close(state->sock);
 460                 state->sock = -1;
 461         }
 462
 463         return;
 464 }
 465
 466 static void smbsock_connect_do_139(struct tevent_req *subreq)
 467 {
 468         struct tevent_req *req = tevent_req_callback_data(
 469                 subreq, struct tevent_req);
 470         struct smbsock_connect_state *state = tevent_req_data(
 471                 req, struct smbsock_connect_state);
 472         bool ret;
 473
 474         ret = tevent_wakeup_recv(subreq);
 475         TALLOC_FREE(subreq);
 476         if (!ret) {
 477                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 478                 return;
 479         }
 480         state->req_139 = nb_connect_send(state, state->ev, state->addr,
 481                                          state->called_name,
 482                                          state->called_type,
 483                                          state->calling_name,
 484                                          state->calling_type);
 485         if (tevent_req_nomem(state->req_139, req)) {
 486                 return;
 487         }
 488         tevent_req_set_callback(state->req_139, smbsock_connect_connected,
 489                                 req);
 490 }
 491
 492 static void smbsock_connect_connected(struct tevent_req *subreq)
 493 {
 494         struct tevent_req *req = tevent_req_callback_data(
 495                 subreq, struct tevent_req);
 496         struct smbsock_connect_state *state = tevent_req_data(
 497                 req, struct smbsock_connect_state);
 498         struct tevent_req *unfinished_req;
 499         NTSTATUS status;
 500
 501         if (subreq == state->req_445) {
 502
 503                 status = open_socket_out_recv(subreq, &state->sock);
 504                 TALLOC_FREE(state->req_445);
 505                 unfinished_req = state->req_139;
 506                 state->port = TCP_SMB_PORT;
 507
 508         } else if (subreq == state->req_139) {
 509
 510                 status = nb_connect_recv(subreq, &state->sock);
 511                 TALLOC_FREE(state->req_139);
 512                 unfinished_req = state->req_445;
 513                 state->port = NBT_SMB_PORT;
 514
 515         } else {
 516                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 517                 return;
 518         }
 519
 520         if (NT_STATUS_IS_OK(status)) {
 521                 TALLOC_FREE(unfinished_req);
 522                 state->req_139 = NULL;
 523                 state->req_445 = NULL;
 524                 tevent_req_done(req);
 525                 return;
 526         }
 527         if (unfinished_req == NULL) {
 528                 /*
 529                  * Both requests failed
 530                  */
 531                 tevent_req_nterror(req, status);
 532                 return;
 533         }
 534         /*
 535          * Do nothing, wait for the second request to come here.
 536          */
 537 }
 538
 539 NTSTATUS smbsock_connect_recv(struct tevent_req *req, int *sock,
 540                               uint16_t *ret_port)
 541 {
 542         struct smbsock_connect_state *state = tevent_req_data(
 543                 req, struct smbsock_connect_state);
 544         NTSTATUS status;
 545
 546         if (tevent_req_is_nterror(req, &status)) {
 547                 tevent_req_received(req);
 548                 return status;
 549         }
 550         *sock = state->sock;
 551         state->sock = -1;
 552         if (ret_port != NULL) {
 553                 *ret_port = state->port;
 554         }
 555         tevent_req_received(req);
 556         return NT_STATUS_OK;
 557 }
 558
 559 NTSTATUS smbsock_connect(const struct sockaddr_storage *addr, uint16_t port,
 560                          const char *called_name, int called_type,
 561                          const char *calling_name, int calling_type,
 562                          int *pfd, uint16_t *ret_port, int sec_timeout)
 563 {
 564         TALLOC_CTX *frame = talloc_stackframe();
 565         struct tevent_context *ev;
 566         struct tevent_req *req;
 567         NTSTATUS status = NT_STATUS_NO_MEMORY;
 568
 569         ev = samba_tevent_context_init(frame);
 570         if (ev == NULL) {
 571                 goto fail;
 572         }
 573         req = smbsock_connect_send(frame, ev, addr, port,
 574                                    called_name, called_type,
 575                                    calling_name, calling_type);
 576         if (req == NULL) {
 577                 goto fail;
 578         }
 579         if ((sec_timeout != 0) &&
 580             !tevent_req_set_endtime(
 581                     req, ev, timeval_current_ofs(sec_timeout, 0))) {
 582                 goto fail;
 583         }
 584         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 585                 goto fail;
 586         }
 587         status = smbsock_connect_recv(req, pfd, ret_port);
 588  fail:
 589         TALLOC_FREE(frame);
 590         return status;
 591 }
 592
 593 struct smbsock_any_connect_state {
 594         struct tevent_context *ev;
 595         const struct sockaddr_storage *addrs;
 596         const char **called_names;
 597         int *called_types;
 598         const char **calling_names;
 599         int *calling_types;
 600         size_t num_addrs;
 601         uint16_t port;
 602
 603         struct tevent_req **requests;
 604         size_t num_sent;
 605         size_t num_received;
 606
 607         int fd;
 608         uint16_t chosen_port;
 609         size_t chosen_index;
 610 };
 611
 612 static void smbsock_any_connect_cleanup(struct tevent_req *req,
 613                                         enum tevent_req_state req_state);
 614 static bool smbsock_any_connect_send_next(
 615         struct tevent_req *req, struct smbsock_any_connect_state *state);
 616 static void smbsock_any_connect_trynext(struct tevent_req *subreq);
 617 static void smbsock_any_connect_connected(struct tevent_req *subreq);
 618
 619 struct tevent_req *smbsock_any_connect_send(TALLOC_CTX *mem_ctx,
 620                                             struct tevent_context *ev,
 621                                             const struct sockaddr_storage *addrs,
 622                                             const char **called_names,
 623                                             int *called_types,
 624                                             const char **calling_names,
 625                                             int *calling_types,
 626                                             size_t num_addrs, uint16_t port)
 627 {
 628         struct tevent_req *req, *subreq;
 629         struct smbsock_any_connect_state *state;
 630
 631         req = tevent_req_create(mem_ctx, &state,
 632                                 struct smbsock_any_connect_state);
 633         if (req == NULL) {
 634                 return NULL;
 635         }
 636         state->ev = ev;
 637         state->addrs = addrs;
 638         state->num_addrs = num_addrs;
 639         state->called_names = called_names;
 640         state->called_types = called_types;
 641         state->calling_names = calling_names;
 642         state->calling_types = calling_types;
 643         state->port = port;
 644         state->fd = -1;
 645
 646         tevent_req_set_cleanup_fn(req, smbsock_any_connect_cleanup);
 647
 648         if (num_addrs == 0) {
 649                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 650                 return tevent_req_post(req, ev);
 651         }
 652
 653         state->requests = talloc_zero_array(state, struct tevent_req *,
 654                                             num_addrs);
 655         if (tevent_req_nomem(state->requests, req)) {
 656                 return tevent_req_post(req, ev);
 657         }
 658         if (!smbsock_any_connect_send_next(req, state)) {
 659                 return tevent_req_post(req, ev);
 660         }
 661         if (state->num_sent >= state->num_addrs) {
 662                 return req;
 663         }
 664         subreq = tevent_wakeup_send(state, ev, timeval_current_ofs(0, 10000));
 665         if (tevent_req_nomem(subreq, req)) {
 666                 return tevent_req_post(req, ev);
 667         }
 668         tevent_req_set_callback(subreq, smbsock_any_connect_trynext, req);
 669         return req;
 670 }
 671
 672 static void smbsock_any_connect_cleanup(struct tevent_req *req,
 673                                         enum tevent_req_state req_state)
 674 {
 675         struct smbsock_any_connect_state *state = tevent_req_data(
 676                 req, struct smbsock_any_connect_state);
 677
 678         TALLOC_FREE(state->requests);
 679
 680         if (req_state == TEVENT_REQ_DONE) {
 681                 /*
 682                  * Keep the socket open for the caller.
 683                  */
 684                 return;
 685         }
 686
 687         if (state->fd != -1) {
 688                 close(state->fd);
 689                 state->fd = -1;
 690         }
 691 }
 692
 693 static void smbsock_any_connect_trynext(struct tevent_req *subreq)
 694 {
 695         struct tevent_req *req = tevent_req_callback_data(
 696                 subreq, struct tevent_req);
 697         struct smbsock_any_connect_state *state = tevent_req_data(
 698                 req, struct smbsock_any_connect_state);
 699         bool ret;
 700
 701         ret = tevent_wakeup_recv(subreq);
 702         TALLOC_FREE(subreq);
 703         if (!ret) {
 704                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 705                 return;
 706         }
 707         if (!smbsock_any_connect_send_next(req, state)) {
 708                 return;
 709         }
 710         if (state->num_sent >= state->num_addrs) {
 711                 return;
 712         }
 713         subreq = tevent_wakeup_send(state, state->ev,
 714                                     tevent_timeval_set(0, 10000));
 715         if (tevent_req_nomem(subreq, req)) {
 716                 return;
 717         }
 718         tevent_req_set_callback(subreq, smbsock_any_connect_trynext, req);
 719 }
 720
 721 static bool smbsock_any_connect_send_next(
 722         struct tevent_req *req, struct smbsock_any_connect_state *state)
 723 {
 724         struct tevent_req *subreq;
 725
 726         if (state->num_sent >= state->num_addrs) {
 727                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 728                 return false;
 729         }
 730         subreq = smbsock_connect_send(
 731                 state->requests, state->ev, &state->addrs[state->num_sent],
 732                 state->port,
 733                 (state->called_names != NULL)
 734                 ? state->called_names[state->num_sent] : NULL,
 735                 (state->called_types != NULL)
 736                 ? state->called_types[state->num_sent] : -1,
 737                 (state->calling_names != NULL)
 738                 ? state->calling_names[state->num_sent] : NULL,
 739                 (state->calling_types != NULL)
 740                 ? state->calling_types[state->num_sent] : -1);
 741         if (tevent_req_nomem(subreq, req)) {
 742                 return false;
 743         }
 744         tevent_req_set_callback(subreq, smbsock_any_connect_connected, req);
 745
 746         state->requests[state->num_sent] = subreq;
 747         state->num_sent += 1;
 748
 749         return true;
 750 }
 751
 752 static void smbsock_any_connect_connected(struct tevent_req *subreq)
 753 {
 754         struct tevent_req *req = tevent_req_callback_data(
 755                 subreq, struct tevent_req);
 756         struct smbsock_any_connect_state *state = tevent_req_data(
 757                 req, struct smbsock_any_connect_state);
 758         NTSTATUS status;
 759         int fd = 0;
 760         uint16_t chosen_port = 0;
 761         size_t i;
 762         size_t chosen_index = 0;
 763
 764         for (i=0; i<state->num_sent; i++) {
 765                 if (state->requests[i] == subreq) {
 766                         chosen_index = i;
 767                         break;
 768                 }
 769         }
 770         if (i == state->num_sent) {
 771                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 772                 return;
 773         }
 774
 775         status = smbsock_connect_recv(subreq, &fd, &chosen_port);
 776
 777         TALLOC_FREE(subreq);
 778         state->requests[chosen_index] = NULL;
 779
 780         if (NT_STATUS_IS_OK(status)) {
 781                 /*
 782                  * tevent_req_done() will kill all the other requests
 783                  * via smbsock_any_connect_cleanup().
 784                  */
 785                 state->fd = fd;
 786                 state->chosen_port = chosen_port;
 787                 state->chosen_index = chosen_index;
 788                 tevent_req_done(req);
 789                 return;
 790         }
 791
 792         state->num_received += 1;
 793         if (state->num_received < state->num_addrs) {
 794                 /*
 795                  * More addrs pending, wait for the others
 796                  */
 797                 return;
 798         }
 799
 800         /*
 801          * This is the last response, none succeeded.
 802          */
 803         tevent_req_nterror(req, status);
 804         return;
 805 }
 806
 807 NTSTATUS smbsock_any_connect_recv(struct tevent_req *req, int *pfd,
 808                                   size_t *chosen_index,
 809                                   uint16_t *chosen_port)
 810 {
 811         struct smbsock_any_connect_state *state = tevent_req_data(
 812                 req, struct smbsock_any_connect_state);
 813         NTSTATUS status;
 814
 815         if (tevent_req_is_nterror(req, &status)) {
 816                 tevent_req_received(req);
 817                 return status;
 818         }
 819         *pfd = state->fd;
 820         state->fd = -1;
 821         if (chosen_index != NULL) {
 822                 *chosen_index = state->chosen_index;
 823         }
 824         if (chosen_port != NULL) {
 825                 *chosen_port = state->chosen_port;
 826         }
 827         tevent_req_received(req);
 828         return NT_STATUS_OK;
 829 }
 830
 831 NTSTATUS smbsock_any_connect(const struct sockaddr_storage *addrs,
 832                              const char **called_names,
 833                              int *called_types,
 834                              const char **calling_names,
 835                              int *calling_types,
 836                              size_t num_addrs,
 837                              uint16_t port,
 838                              int sec_timeout,
 839                              int *pfd, size_t *chosen_index,
 840                              uint16_t *chosen_port)
 841 {
 842         TALLOC_CTX *frame = talloc_stackframe();
 843         struct tevent_context *ev;
 844         struct tevent_req *req;
 845         NTSTATUS status = NT_STATUS_NO_MEMORY;
 846
 847         ev = samba_tevent_context_init(frame);
 848         if (ev == NULL) {
 849                 goto fail;
 850         }
 851         req = smbsock_any_connect_send(frame, ev, addrs,
 852                                        called_names, called_types,
 853                                        calling_names, calling_types,
 854                                        num_addrs, port);
 855         if (req == NULL) {
 856                 goto fail;
 857         }
 858         if ((sec_timeout != 0) &&
 859             !tevent_req_set_endtime(
 860                     req, ev, timeval_current_ofs(sec_timeout, 0))) {
 861                 goto fail;
 862         }
 863         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 864                 goto fail;
 865         }
 866         status = smbsock_any_connect_recv(req, pfd, chosen_index, chosen_port);
 867  fail:
 868         TALLOC_FREE(frame);
 869         return status;
 870 }