source3/lib/wbclient.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async winbind requests
   4    Copyright (C) Volker Lendecke 2008
   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 "winbindd/winbindd.h"
  22 #include "winbindd/winbindd_proto.h"
  23
  24 static int make_nonstd_fd(int fd)
  25 {
  26         int i;
  27         int sys_errno = 0;
  28         int fds[3];
  29         int num_fds = 0;
  30
  31         if (fd == -1) {
  32                 return -1;
  33         }
  34         while (fd < 3) {
  35                 fds[num_fds++] = fd;
  36                 fd = dup(fd);
  37                 if (fd == -1) {
  38                         sys_errno = errno;
  39                         break;
  40                 }
  41         }
  42         for (i=0; i<num_fds; i++) {
  43                 close(fds[i]);
  44         }
  45         if (fd == -1) {
  46                 errno = sys_errno;
  47         }
  48         return fd;
  49 }
  50
  51 /****************************************************************************
  52  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
  53  else
  54  if SYSV use O_NDELAY
  55  if BSD use FNDELAY
  56  Set close on exec also.
  57 ****************************************************************************/
  58
  59 static int make_safe_fd(int fd)
  60 {
  61         int result, flags;
  62         int new_fd = make_nonstd_fd(fd);
  63
  64         if (new_fd == -1) {
  65                 goto fail;
  66         }
  67
  68         /* Socket should be nonblocking. */
  69
  70 #ifdef O_NONBLOCK
  71 #define FLAG_TO_SET O_NONBLOCK
  72 #else
  73 #ifdef SYSV
  74 #define FLAG_TO_SET O_NDELAY
  75 #else /* BSD */
  76 #define FLAG_TO_SET FNDELAY
  77 #endif
  78 #endif
  79
  80         if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
  81                 goto fail;
  82         }
  83
  84         flags |= FLAG_TO_SET;
  85         if (fcntl(new_fd, F_SETFL, flags) == -1) {
  86                 goto fail;
  87         }
  88
  89 #undef FLAG_TO_SET
  90
  91         /* Socket should be closed on exec() */
  92 #ifdef FD_CLOEXEC
  93         result = flags = fcntl(new_fd, F_GETFD, 0);
  94         if (flags >= 0) {
  95                 flags |= FD_CLOEXEC;
  96                 result = fcntl( new_fd, F_SETFD, flags );
  97         }
  98         if (result < 0) {
  99                 goto fail;
 100         }
 101 #endif
 102         return new_fd;
 103
 104  fail:
 105         if (new_fd != -1) {
 106                 int sys_errno = errno;
 107                 close(new_fd);
 108                 errno = sys_errno;
 109         }
 110         return -1;
 111 }
 112
 113 static bool winbind_closed_fd(int fd)
 114 {
 115         struct timeval tv;
 116         fd_set r_fds;
 117
 118         if (fd == -1) {
 119                 return true;
 120         }
 121
 122         FD_ZERO(&r_fds);
 123         FD_SET(fd, &r_fds);
 124         ZERO_STRUCT(tv);
 125
 126         if ((select(fd+1, &r_fds, NULL, NULL, &tv) == -1)
 127             || FD_ISSET(fd, &r_fds)) {
 128                 return true;
 129         }
 130
 131         return false;
 132 }
 133
 134 struct wb_context {
 135         struct async_req_queue *queue;
 136         int fd;
 137         bool is_priv;
 138 };
 139
 140 struct wb_context *wb_context_init(TALLOC_CTX *mem_ctx)
 141 {
 142         struct wb_context *result;
 143
 144         result = talloc(mem_ctx, struct wb_context);
 145         if (result == NULL) {
 146                 return NULL;
 147         }
 148         result->queue = async_req_queue_init(result);
 149         if (result->queue == NULL) {
 150                 TALLOC_FREE(result);
 151                 return NULL;
 152         }
 153         result->fd = -1;
 154         return result;
 155 }
 156
 157 static struct async_req *wb_connect_send(TALLOC_CTX *mem_ctx,
 158                                          struct event_context *ev,
 159                                          struct wb_context *wb_ctx,
 160                                          const char *dir)
 161 {
 162         struct async_req *req;
 163         struct sockaddr_un sunaddr;
 164         struct stat st;
 165         char *path = NULL;
 166         NTSTATUS status;
 167
 168         if (wb_ctx->fd != -1) {
 169                 close(wb_ctx->fd);
 170                 wb_ctx->fd = -1;
 171         }
 172
 173         /* Check permissions on unix socket directory */
 174
 175         if (lstat(dir, &st) == -1) {
 176                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 177                 goto post_status;
 178         }
 179
 180         if (!S_ISDIR(st.st_mode) ||
 181             (st.st_uid != 0 && st.st_uid != geteuid())) {
 182                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 183                 goto post_status;
 184         }
 185
 186         /* Connect to socket */
 187
 188         path = talloc_asprintf(talloc_tos(), "%s/%s", dir,
 189                                WINBINDD_SOCKET_NAME);
 190         if (path == NULL) {
 191                 goto nomem;
 192         }
 193
 194         sunaddr.sun_family = AF_UNIX;
 195         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
 196         TALLOC_FREE(path);
 197
 198         /* If socket file doesn't exist, don't bother trying to connect
 199            with retry.  This is an attempt to make the system usable when
 200            the winbindd daemon is not running. */
 201
 202         if ((lstat(sunaddr.sun_path, &st) == -1)
 203             || !S_ISSOCK(st.st_mode)
 204             || (st.st_uid != 0 && st.st_uid != geteuid())) {
 205                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 206                 goto post_status;
 207         }
 208
 209         wb_ctx->fd = make_safe_fd(socket(AF_UNIX, SOCK_STREAM, 0));
 210         if (wb_ctx->fd == -1) {
 211                 status = map_nt_error_from_unix(errno);
 212                 goto post_status;
 213         }
 214
 215         req = async_connect_send(mem_ctx, ev, wb_ctx->fd,
 216                                  (struct sockaddr *)&sunaddr,
 217                                  sizeof(sunaddr));
 218         if (req == NULL) {
 219                 goto nomem;
 220         }
 221         if (!async_req_set_timeout(req, ev, timeval_set(30, 0))) {
 222                 TALLOC_FREE(req);
 223                 goto nomem;
 224         }
 225
 226         return req;
 227
 228  nomem:
 229         status = NT_STATUS_NO_MEMORY;
 230  post_status:
 231         req = async_req_new(mem_ctx);
 232         if (req == NULL) {
 233                 return NULL;
 234         }
 235         if (async_post_status(req, ev, status)) {
 236                 return req;
 237         }
 238         TALLOC_FREE(req);
 239         return NULL;
 240 }
 241
 242 static NTSTATUS wb_connect_recv(struct async_req *req)
 243 {
 244         int dummy;
 245
 246         return async_connect_recv(req, &dummy);
 247 }
 248
 249 static struct winbindd_request *winbindd_request_copy(
 250         TALLOC_CTX *mem_ctx,
 251         const struct winbindd_request *req)
 252 {
 253         struct winbindd_request *result;
 254
 255         result = (struct winbindd_request *)TALLOC_MEMDUP(
 256                 mem_ctx, req, sizeof(struct winbindd_request));
 257         if (result == NULL) {
 258                 return NULL;
 259         }
 260
 261         if (result->extra_len == 0) {
 262                 return result;
 263         }
 264
 265         result->extra_data.data = (char *)TALLOC_MEMDUP(
 266                 result, result->extra_data.data, result->extra_len);
 267         if (result->extra_data.data == NULL) {
 268                 TALLOC_FREE(result);
 269                 return NULL;
 270         }
 271         return result;
 272 }
 273
 274 struct wb_int_trans_state {
 275         struct event_context *ev;
 276         int fd;
 277         struct winbindd_request *wb_req;
 278         struct winbindd_response *wb_resp;
 279 };
 280
 281 static void wb_int_trans_write_done(struct async_req *subreq);
 282 static void wb_int_trans_read_done(struct async_req *subreq);
 283
 284 static struct async_req *wb_int_trans_send(TALLOC_CTX *mem_ctx,
 285                                            struct event_context *ev, int fd,
 286                                            struct winbindd_request *wb_req)
 287 {
 288         struct async_req *result;
 289         struct async_req *subreq;
 290         struct wb_int_trans_state *state;
 291
 292         result = async_req_new(mem_ctx);
 293         if (result == NULL) {
 294                 return NULL;
 295         }
 296         state = talloc(result, struct wb_int_trans_state);
 297         if (state == NULL) {
 298                 goto fail;
 299         }
 300         result->private_data = state;
 301
 302         if (winbind_closed_fd(fd)) {
 303                 if (!async_post_status(result, ev,
 304                                        NT_STATUS_PIPE_DISCONNECTED)) {
 305                         goto fail;
 306                 }
 307                 return result;
 308         }
 309
 310         state->ev = ev;
 311         state->fd = fd;
 312         state->wb_req = wb_req;
 313
 314         state->wb_req->length = sizeof(struct winbindd_request);
 315         state->wb_req->pid = getpid();
 316
 317         subreq = wb_req_write_send(state, state->ev, state->fd, state->wb_req);
 318         if (subreq == NULL) {
 319                 goto fail;
 320         }
 321         subreq->async.fn = wb_int_trans_write_done;
 322         subreq->async.priv = result;
 323
 324         return result;
 325
 326  fail:
 327         TALLOC_FREE(result);
 328         return NULL;
 329 }
 330
 331 static void wb_int_trans_write_done(struct async_req *subreq)
 332 {
 333         struct async_req *req = talloc_get_type_abort(
 334                 subreq->async.priv, struct async_req);
 335         struct wb_int_trans_state *state = talloc_get_type_abort(
 336                 req->private_data, struct wb_int_trans_state);
 337         NTSTATUS status;
 338
 339         status = wb_req_write_recv(subreq);
 340         TALLOC_FREE(subreq);
 341         if (!NT_STATUS_IS_OK(status)) {
 342                 async_req_error(req, status);
 343                 return;
 344         }
 345
 346         subreq = wb_resp_read_send(state, state->ev, state->fd);
 347         if (subreq == NULL) {
 348                 async_req_error(req, NT_STATUS_NO_MEMORY);
 349         }
 350         subreq->async.fn = wb_int_trans_read_done;
 351         subreq->async.priv = req;
 352 }
 353
 354 static void wb_int_trans_read_done(struct async_req *subreq)
 355 {
 356         struct async_req *req = talloc_get_type_abort(
 357                 subreq->async.priv, struct async_req);
 358         struct wb_int_trans_state *state = talloc_get_type_abort(
 359                 req->private_data, struct wb_int_trans_state);
 360         NTSTATUS status;
 361
 362         status = wb_resp_read_recv(subreq, state, &state->wb_resp);
 363         TALLOC_FREE(subreq);
 364         if (!NT_STATUS_IS_OK(status)) {
 365                 async_req_error(req, status);
 366                 return;
 367         }
 368
 369         async_req_done(req);
 370 }
 371
 372 static NTSTATUS wb_int_trans_recv(struct async_req *req,
 373                                   TALLOC_CTX *mem_ctx,
 374                                   struct winbindd_response **presponse)
 375 {
 376         struct wb_int_trans_state *state = talloc_get_type_abort(
 377                 req->private_data, struct wb_int_trans_state);
 378         NTSTATUS status;
 379
 380         if (async_req_is_error(req, &status)) {
 381                 return status;
 382         }
 383
 384         *presponse = talloc_move(mem_ctx, &state->wb_resp);
 385         return NT_STATUS_OK;
 386 }
 387
 388 static const char *winbindd_socket_dir(void)
 389 {
 390 #ifdef SOCKET_WRAPPER
 391         const char *env_dir;
 392
 393         env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
 394         if (env_dir) {
 395                 return env_dir;
 396         }
 397 #endif
 398
 399         return WINBINDD_SOCKET_DIR;
 400 }
 401
 402 struct wb_open_pipe_state {
 403         struct wb_context *wb_ctx;
 404         struct event_context *ev;
 405         bool need_priv;
 406         struct winbindd_request wb_req;
 407 };
 408
 409 static void wb_open_pipe_connect_nonpriv_done(struct async_req *subreq);
 410 static void wb_open_pipe_ping_done(struct async_req *subreq);
 411 static void wb_open_pipe_getpriv_done(struct async_req *subreq);
 412 static void wb_open_pipe_connect_priv_done(struct async_req *subreq);
 413
 414 static struct async_req *wb_open_pipe_send(TALLOC_CTX *mem_ctx,
 415                                            struct event_context *ev,
 416                                            struct wb_context *wb_ctx,
 417                                            bool need_priv)
 418 {
 419         struct async_req *result;
 420         struct async_req *subreq;
 421         struct wb_open_pipe_state *state;
 422
 423         result = async_req_new(mem_ctx);
 424         if (result == NULL) {
 425                 return NULL;
 426         }
 427         state = talloc(result, struct wb_open_pipe_state);
 428         if (state == NULL) {
 429                 goto fail;
 430         }
 431         result->private_data = state;
 432
 433         state->wb_ctx = wb_ctx;
 434         state->ev = ev;
 435         state->need_priv = need_priv;
 436
 437         if (wb_ctx->fd != -1) {
 438                 close(wb_ctx->fd);
 439                 wb_ctx->fd = -1;
 440         }
 441
 442         subreq = wb_connect_send(state, ev, wb_ctx, winbindd_socket_dir());
 443         if (subreq == NULL) {
 444                 goto fail;
 445         }
 446
 447         subreq->async.fn = wb_open_pipe_connect_nonpriv_done;
 448         subreq->async.priv = result;
 449         return result;
 450
 451  fail:
 452         TALLOC_FREE(result);
 453         return NULL;
 454 }
 455
 456 static void wb_open_pipe_connect_nonpriv_done(struct async_req *subreq)
 457 {
 458         struct async_req *req = talloc_get_type_abort(
 459                 subreq->async.priv, struct async_req);
 460         struct wb_open_pipe_state *state = talloc_get_type_abort(
 461                 req->private_data, struct wb_open_pipe_state);
 462         NTSTATUS status;
 463
 464         status = wb_connect_recv(subreq);
 465         TALLOC_FREE(subreq);
 466         if (!NT_STATUS_IS_OK(status)) {
 467                 state->wb_ctx->is_priv = true;
 468                 async_req_error(req, status);
 469                 return;
 470         }
 471
 472         ZERO_STRUCT(state->wb_req);
 473         state->wb_req.cmd = WINBINDD_INTERFACE_VERSION;
 474
 475         subreq = wb_int_trans_send(state, state->ev, state->wb_ctx->fd,
 476                                    &state->wb_req);
 477         if (async_req_nomem(subreq, req)) {
 478                 return;
 479         }
 480
 481         subreq->async.fn = wb_open_pipe_ping_done;
 482         subreq->async.priv = req;
 483 }
 484
 485 static void wb_open_pipe_ping_done(struct async_req *subreq)
 486 {
 487         struct async_req *req = talloc_get_type_abort(
 488                 subreq->async.priv, struct async_req);
 489         struct wb_open_pipe_state *state = talloc_get_type_abort(
 490                 req->private_data, struct wb_open_pipe_state);
 491         struct winbindd_response *wb_resp;
 492         NTSTATUS status;
 493
 494         status = wb_int_trans_recv(subreq, state, &wb_resp);
 495         TALLOC_FREE(subreq);
 496         if (!NT_STATUS_IS_OK(status)) {
 497                 async_req_error(req, status);
 498                 return;
 499         }
 500
 501         if (!state->need_priv) {
 502                 async_req_done(req);
 503                 return;
 504         }
 505
 506         state->wb_req.cmd = WINBINDD_PRIV_PIPE_DIR;
 507
 508         subreq = wb_int_trans_send(state, state->ev, state->wb_ctx->fd,
 509                                    &state->wb_req);
 510         if (async_req_nomem(subreq, req)) {
 511                 return;
 512         }
 513
 514         subreq->async.fn = wb_open_pipe_getpriv_done;
 515         subreq->async.priv = req;
 516 }
 517
 518 static void wb_open_pipe_getpriv_done(struct async_req *subreq)
 519 {
 520         struct async_req *req = talloc_get_type_abort(
 521                 subreq->async.priv, struct async_req);
 522         struct wb_open_pipe_state *state = talloc_get_type_abort(
 523                 req->private_data, struct wb_open_pipe_state);
 524         struct winbindd_response *wb_resp = NULL;
 525         NTSTATUS status;
 526
 527         status = wb_int_trans_recv(subreq, state, &wb_resp);
 528         TALLOC_FREE(subreq);
 529         if (!NT_STATUS_IS_OK(status)) {
 530                 async_req_error(req, status);
 531                 return;
 532         }
 533
 534         close(state->wb_ctx->fd);
 535         state->wb_ctx->fd = -1;
 536
 537         subreq = wb_connect_send(state, state->ev, state->wb_ctx,
 538                                  (char *)wb_resp->extra_data.data);
 539         TALLOC_FREE(wb_resp);
 540         if (async_req_nomem(subreq, req)) {
 541                 return;
 542         }
 543
 544         subreq->async.fn = wb_open_pipe_connect_priv_done;
 545         subreq->async.priv = req;
 546 }
 547
 548 static void wb_open_pipe_connect_priv_done(struct async_req *subreq)
 549 {
 550         struct async_req *req = talloc_get_type_abort(
 551                 subreq->async.priv, struct async_req);
 552         struct wb_open_pipe_state *state = talloc_get_type_abort(
 553                 req->private_data, struct wb_open_pipe_state);
 554         NTSTATUS status;
 555
 556         status = wb_connect_recv(subreq);
 557         TALLOC_FREE(subreq);
 558         if (!NT_STATUS_IS_OK(status)) {
 559                 async_req_error(req, status);
 560                 return;
 561         }
 562         state->wb_ctx->is_priv = true;
 563         async_req_done(req);
 564 }
 565
 566 static NTSTATUS wb_open_pipe_recv(struct async_req *req)
 567 {
 568         return async_req_simple_recv(req);
 569 }
 570
 571 struct wb_trans_state {
 572         struct wb_trans_state *prev, *next;
 573         struct wb_context *wb_ctx;
 574         struct event_context *ev;
 575         struct winbindd_request *wb_req;
 576         struct winbindd_response *wb_resp;
 577         int num_retries;
 578         bool need_priv;
 579 };
 580
 581 static void wb_trans_connect_done(struct async_req *subreq);
 582 static void wb_trans_done(struct async_req *subreq);
 583 static void wb_trans_retry_wait_done(struct async_req *subreq);
 584
 585 static void wb_trigger_trans(struct async_req *req)
 586 {
 587         struct wb_trans_state *state = talloc_get_type_abort(
 588                 req->private_data, struct wb_trans_state);
 589         struct async_req *subreq;
 590
 591         if ((state->wb_ctx->fd == -1)
 592             || (state->need_priv && !state->wb_ctx->is_priv)) {
 593
 594                 subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
 595                                            state->need_priv);
 596                 if (async_req_nomem(subreq, req)) {
 597                         return;
 598                 }
 599                 subreq->async.fn = wb_trans_connect_done;
 600                 subreq->async.priv = req;
 601                 return;
 602         }
 603
 604         subreq = wb_int_trans_send(state, state->ev, state->wb_ctx->fd,
 605                                    state->wb_req);
 606         if (async_req_nomem(subreq, req)) {
 607                 return;
 608         }
 609         subreq->async.fn = wb_trans_done;
 610         subreq->async.priv = req;
 611 }
 612
 613 struct async_req *wb_trans_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 614                                 struct wb_context *wb_ctx, bool need_priv,
 615                                 const struct winbindd_request *wb_req)
 616 {
 617         struct async_req *result;
 618         struct wb_trans_state *state;
 619
 620         result = async_req_new(mem_ctx);
 621         if (result == NULL) {
 622                 return NULL;
 623         }
 624         state = talloc(result, struct wb_trans_state);
 625         if (state == NULL) {
 626                 goto fail;
 627         }
 628         result->private_data = state;
 629
 630         state->wb_ctx = wb_ctx;
 631         state->ev = ev;
 632         state->wb_req = winbindd_request_copy(state, wb_req);
 633         if (state->wb_req == NULL) {
 634                 goto fail;
 635         }
 636         state->num_retries = 10;
 637         state->need_priv = need_priv;
 638
 639         if (!async_req_enqueue(wb_ctx->queue, ev, result, wb_trigger_trans)) {
 640                 goto fail;
 641         }
 642         return result;
 643
 644  fail:
 645         TALLOC_FREE(result);
 646         return NULL;
 647 }
 648
 649 static bool wb_trans_retry(struct async_req *req,
 650                            struct wb_trans_state *state,
 651                            NTSTATUS status)
 652 {
 653         struct async_req *subreq;
 654
 655         if (NT_STATUS_IS_OK(status)) {
 656                 return false;
 657         }
 658
 659         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)
 660             || NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 661                 /*
 662                  * Winbind not around or we can't connect to the pipe. Fail
 663                  * immediately.
 664                  */
 665                 async_req_error(req, status);
 666                 return true;
 667         }
 668
 669         state->num_retries -= 1;
 670         if (state->num_retries == 0) {
 671                 async_req_error(req, status);
 672                 return true;
 673         }
 674
 675         /*
 676          * The transfer as such failed, retry after one second
 677          */
 678
 679         if (state->wb_ctx->fd != -1) {
 680                 close(state->wb_ctx->fd);
 681                 state->wb_ctx->fd = -1;
 682         }
 683
 684         subreq = async_wait_send(state, state->ev, timeval_set(1, 0));
 685         if (async_req_nomem(subreq, req)) {
 686                 return true;
 687         }
 688
 689         subreq->async.fn = wb_trans_retry_wait_done;
 690         subreq->async.priv = req;
 691         return true;
 692 }
 693
 694 static void wb_trans_retry_wait_done(struct async_req *subreq)
 695 {
 696         struct async_req *req = talloc_get_type_abort(
 697                 subreq->async.priv, struct async_req);
 698         struct wb_trans_state *state = talloc_get_type_abort(
 699                 req->private_data, struct wb_trans_state);
 700         NTSTATUS status;
 701
 702         status = async_wait_recv(subreq);
 703         TALLOC_FREE(subreq);
 704         if (!NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 705                 async_req_error(req, status);
 706                 return;
 707         }
 708
 709         subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
 710                                    state->need_priv);
 711         if (async_req_nomem(subreq, req)) {
 712                 return;
 713         }
 714         subreq->async.fn = wb_trans_connect_done;
 715         subreq->async.priv = req;
 716 }
 717
 718 static void wb_trans_connect_done(struct async_req *subreq)
 719 {
 720         struct async_req *req = talloc_get_type_abort(
 721                 subreq->async.priv, struct async_req);
 722         struct wb_trans_state *state = talloc_get_type_abort(
 723                 req->private_data, struct wb_trans_state);
 724         NTSTATUS status;
 725
 726         status = wb_open_pipe_recv(subreq);
 727         TALLOC_FREE(subreq);
 728
 729         if (wb_trans_retry(req, state, status)) {
 730                 return;
 731         }
 732
 733         subreq = wb_int_trans_send(state, state->ev, state->wb_ctx->fd,
 734                                    state->wb_req);
 735         if (async_req_nomem(subreq, req)) {
 736                 return;
 737         }
 738
 739         subreq->async.fn = wb_trans_done;
 740         subreq->async.priv = req;
 741 }
 742
 743 static void wb_trans_done(struct async_req *subreq)
 744 {
 745         struct async_req *req = talloc_get_type_abort(
 746                 subreq->async.priv, struct async_req);
 747         struct wb_trans_state *state = talloc_get_type_abort(
 748                 req->private_data, struct wb_trans_state);
 749         NTSTATUS status;
 750
 751         status = wb_int_trans_recv(subreq, state, &state->wb_resp);
 752         TALLOC_FREE(subreq);
 753
 754         if (wb_trans_retry(req, state, status)) {
 755                 return;
 756         }
 757
 758         async_req_done(req);
 759 }
 760
 761 NTSTATUS wb_trans_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
 762                        struct winbindd_response **presponse)
 763 {
 764         struct wb_trans_state *state = talloc_get_type_abort(
 765                 req->private_data, struct wb_trans_state);
 766         NTSTATUS status;
 767
 768         if (async_req_is_error(req, &status)) {
 769                 return status;
 770         }
 771
 772         *presponse = talloc_move(mem_ctx, &state->wb_resp);
 773         return NT_STATUS_OK;
 774 }