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 "wbc_async.h"
  22
  23 struct wb_context {
  24         struct async_req_queue *queue;
  25         int fd;
  26         bool is_priv;
  27 };
  28
  29 static int make_nonstd_fd(int fd)
  30 {
  31         int i;
  32         int sys_errno = 0;
  33         int fds[3];
  34         int num_fds = 0;
  35
  36         if (fd == -1) {
  37                 return -1;
  38         }
  39         while (fd < 3) {
  40                 fds[num_fds++] = fd;
  41                 fd = dup(fd);
  42                 if (fd == -1) {
  43                         sys_errno = errno;
  44                         break;
  45                 }
  46         }
  47         for (i=0; i<num_fds; i++) {
  48                 close(fds[i]);
  49         }
  50         if (fd == -1) {
  51                 errno = sys_errno;
  52         }
  53         return fd;
  54 }
  55
  56 /****************************************************************************
  57  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
  58  else
  59  if SYSV use O_NDELAY
  60  if BSD use FNDELAY
  61  Set close on exec also.
  62 ****************************************************************************/
  63
  64 static int make_safe_fd(int fd)
  65 {
  66         int result, flags;
  67         int new_fd = make_nonstd_fd(fd);
  68
  69         if (new_fd == -1) {
  70                 goto fail;
  71         }
  72
  73         /* Socket should be nonblocking. */
  74
  75 #ifdef O_NONBLOCK
  76 #define FLAG_TO_SET O_NONBLOCK
  77 #else
  78 #ifdef SYSV
  79 #define FLAG_TO_SET O_NDELAY
  80 #else /* BSD */
  81 #define FLAG_TO_SET FNDELAY
  82 #endif
  83 #endif
  84
  85         if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
  86                 goto fail;
  87         }
  88
  89         flags |= FLAG_TO_SET;
  90         if (fcntl(new_fd, F_SETFL, flags) == -1) {
  91                 goto fail;
  92         }
  93
  94 #undef FLAG_TO_SET
  95
  96         /* Socket should be closed on exec() */
  97 #ifdef FD_CLOEXEC
  98         result = flags = fcntl(new_fd, F_GETFD, 0);
  99         if (flags >= 0) {
 100                 flags |= FD_CLOEXEC;
 101                 result = fcntl( new_fd, F_SETFD, flags );
 102         }
 103         if (result < 0) {
 104                 goto fail;
 105         }
 106 #endif
 107         return new_fd;
 108
 109  fail:
 110         if (new_fd != -1) {
 111                 int sys_errno = errno;
 112                 close(new_fd);
 113                 errno = sys_errno;
 114         }
 115         return -1;
 116 }
 117
 118 static bool winbind_closed_fd(int fd)
 119 {
 120         struct timeval tv;
 121         fd_set r_fds;
 122
 123         if (fd == -1) {
 124                 return true;
 125         }
 126
 127         FD_ZERO(&r_fds);
 128         FD_SET(fd, &r_fds);
 129         ZERO_STRUCT(tv);
 130
 131         if ((select(fd+1, &r_fds, NULL, NULL, &tv) == -1)
 132             || FD_ISSET(fd, &r_fds)) {
 133                 return true;
 134         }
 135
 136         return false;
 137 }
 138
 139 struct wb_context *wb_context_init(TALLOC_CTX *mem_ctx)
 140 {
 141         struct wb_context *result;
 142
 143         result = talloc(mem_ctx, struct wb_context);
 144         if (result == NULL) {
 145                 return NULL;
 146         }
 147         result->queue = async_req_queue_init(result);
 148         if (result->queue == NULL) {
 149                 TALLOC_FREE(result);
 150                 return NULL;
 151         }
 152         result->fd = -1;
 153         return result;
 154 }
 155
 156 struct wb_connect_state {
 157         int dummy;
 158 };
 159
 160 static void wbc_connect_connected(struct tevent_req *subreq);
 161
 162 static struct tevent_req *wb_connect_send(TALLOC_CTX *mem_ctx,
 163                                           struct tevent_context *ev,
 164                                           struct wb_context *wb_ctx,
 165                                           const char *dir)
 166 {
 167         struct tevent_req *result, *subreq;
 168         struct wb_connect_state *state;
 169         struct sockaddr_un sunaddr;
 170         struct stat st;
 171         char *path = NULL;
 172         wbcErr wbc_err;
 173
 174         result = tevent_req_create(mem_ctx, &state, struct wb_connect_state);
 175         if (result == NULL) {
 176                 return NULL;
 177         }
 178
 179         if (wb_ctx->fd != -1) {
 180                 close(wb_ctx->fd);
 181                 wb_ctx->fd = -1;
 182         }
 183
 184         /* Check permissions on unix socket directory */
 185
 186         if (lstat(dir, &st) == -1) {
 187                 wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
 188                 goto post_status;
 189         }
 190
 191         if (!S_ISDIR(st.st_mode) ||
 192             (st.st_uid != 0 && st.st_uid != geteuid())) {
 193                 wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
 194                 goto post_status;
 195         }
 196
 197         /* Connect to socket */
 198
 199         path = talloc_asprintf(talloc_tos(), "%s/%s", dir,
 200                                WINBINDD_SOCKET_NAME);
 201         if (path == NULL) {
 202                 goto nomem;
 203         }
 204
 205         sunaddr.sun_family = AF_UNIX;
 206         strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
 207         TALLOC_FREE(path);
 208
 209         /* If socket file doesn't exist, don't bother trying to connect
 210            with retry.  This is an attempt to make the system usable when
 211            the winbindd daemon is not running. */
 212
 213         if ((lstat(sunaddr.sun_path, &st) == -1)
 214             || !S_ISSOCK(st.st_mode)
 215             || (st.st_uid != 0 && st.st_uid != geteuid())) {
 216                 wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
 217                 goto post_status;
 218         }
 219
 220         wb_ctx->fd = make_safe_fd(socket(AF_UNIX, SOCK_STREAM, 0));
 221         if (wb_ctx->fd == -1) {
 222                 wbc_err = map_wbc_err_from_errno(errno);
 223                 goto post_status;
 224         }
 225
 226         subreq = async_connect_send(mem_ctx, ev, wb_ctx->fd,
 227                                     (struct sockaddr *)&sunaddr,
 228                                     sizeof(sunaddr));
 229         if (subreq == NULL) {
 230                 goto nomem;
 231         }
 232         tevent_req_set_callback(subreq, wbc_connect_connected, result);
 233
 234         if (!tevent_req_set_endtime(subreq, ev, timeval_current_ofs(30, 0))) {
 235                 goto nomem;
 236         }
 237
 238         return result;
 239
 240  post_status:
 241         tevent_req_error(result, wbc_err);
 242         return tevent_req_post(result, ev);
 243  nomem:
 244         TALLOC_FREE(result);
 245         return NULL;
 246 }
 247
 248 static void wbc_connect_connected(struct tevent_req *subreq)
 249 {
 250         struct tevent_req *req = tevent_req_callback_data(
 251                 subreq, struct tevent_req);
 252         int res, err;
 253
 254         res = async_connect_recv(subreq, &err);
 255         TALLOC_FREE(subreq);
 256         if (res == -1) {
 257                 tevent_req_error(req, map_wbc_err_from_errno(err));
 258                 return;
 259         }
 260         tevent_req_done(req);
 261 }
 262
 263 static wbcErr wb_connect_recv(struct tevent_req *req)
 264 {
 265         return tevent_req_simple_recv_wbcerr(req);
 266 }
 267
 268 struct wb_int_trans_state {
 269         struct tevent_context *ev;
 270         int fd;
 271         struct winbindd_request *wb_req;
 272         struct winbindd_response *wb_resp;
 273 };
 274
 275 static void wb_int_trans_write_done(struct tevent_req *subreq);
 276 static void wb_int_trans_read_done(struct tevent_req *subreq);
 277
 278 static struct tevent_req *wb_int_trans_send(TALLOC_CTX *mem_ctx,
 279                                             struct tevent_context *ev,
 280                                             struct tevent_queue *queue, int fd,
 281                                             struct winbindd_request *wb_req)
 282 {
 283         struct tevent_req *result, *subreq;
 284         struct wb_int_trans_state *state;
 285
 286         result = tevent_req_create(mem_ctx, &state,
 287                                    struct wb_int_trans_state);
 288         if (result == NULL) {
 289                 return NULL;
 290         }
 291
 292         if (winbind_closed_fd(fd)) {
 293                 tevent_req_error(result, WBC_ERR_WINBIND_NOT_AVAILABLE);
 294                 return tevent_req_post(result, ev);
 295         }
 296
 297         state->ev = ev;
 298         state->fd = fd;
 299         state->wb_req = wb_req;
 300         state->wb_req->length = sizeof(struct winbindd_request);
 301         state->wb_req->pid = getpid();
 302
 303         subreq = wb_req_write_send(state, state->ev, queue, state->fd,
 304                                    state->wb_req);
 305         if (subreq == NULL) {
 306                 goto fail;
 307         }
 308         tevent_req_set_callback(subreq, wb_int_trans_write_done, result);
 309
 310         return result;
 311
 312  fail:
 313         TALLOC_FREE(result);
 314         return NULL;
 315 }
 316
 317 static void wb_int_trans_write_done(struct tevent_req *subreq)
 318 {
 319         struct tevent_req *req = tevent_req_callback_data(
 320                 subreq, struct tevent_req);
 321         struct wb_int_trans_state *state = tevent_req_data(
 322                 req, struct wb_int_trans_state);
 323         wbcErr wbc_err;
 324
 325         wbc_err = wb_req_write_recv(subreq);
 326         TALLOC_FREE(subreq);
 327         if (!WBC_ERROR_IS_OK(wbc_err)) {
 328                 tevent_req_error(req, wbc_err);
 329                 return;
 330         }
 331
 332         subreq = wb_resp_read_send(state, state->ev, state->fd);
 333         if (tevent_req_nomem(subreq, req)) {
 334                 return;
 335         }
 336         tevent_req_set_callback(subreq, wb_int_trans_read_done, req);
 337 }
 338
 339 static void wb_int_trans_read_done(struct tevent_req *subreq)
 340 {
 341         struct tevent_req *req = tevent_req_callback_data(
 342                 subreq, struct tevent_req);
 343         struct wb_int_trans_state *state = tevent_req_data(
 344                 req, struct wb_int_trans_state);
 345         wbcErr wbc_err;
 346
 347         wbc_err = wb_resp_read_recv(subreq, state, &state->wb_resp);
 348         TALLOC_FREE(subreq);
 349         if (!WBC_ERROR_IS_OK(wbc_err)) {
 350                 tevent_req_error(req, wbc_err);
 351                 return;
 352         }
 353
 354         tevent_req_done(req);
 355 }
 356
 357 static wbcErr wb_int_trans_recv(struct tevent_req *req,
 358                                 TALLOC_CTX *mem_ctx,
 359                                 struct winbindd_response **presponse)
 360 {
 361         struct wb_int_trans_state *state = tevent_req_data(
 362                 req, struct wb_int_trans_state);
 363         wbcErr wbc_err;
 364
 365         if (tevent_req_is_wbcerr(req, &wbc_err)) {
 366                 return wbc_err;
 367         }
 368
 369         *presponse = talloc_move(mem_ctx, &state->wb_resp);
 370         return WBC_ERR_SUCCESS;
 371 }
 372
 373 static const char *winbindd_socket_dir(void)
 374 {
 375 #ifdef SOCKET_WRAPPER
 376         const char *env_dir;
 377
 378         env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
 379         if (env_dir) {
 380                 return env_dir;
 381         }
 382 #endif
 383
 384         return WINBINDD_SOCKET_DIR;
 385 }
 386
 387 struct wb_open_pipe_state {
 388         struct wb_context *wb_ctx;
 389         struct tevent_context *ev;
 390         bool need_priv;
 391         struct winbindd_request wb_req;
 392 };
 393
 394 static void wb_open_pipe_connect_nonpriv_done(struct tevent_req *subreq);
 395 static void wb_open_pipe_ping_done(struct tevent_req *subreq);
 396 static void wb_open_pipe_getpriv_done(struct tevent_req *subreq);
 397 static void wb_open_pipe_connect_priv_done(struct tevent_req *subreq);
 398
 399 static struct tevent_req *wb_open_pipe_send(TALLOC_CTX *mem_ctx,
 400                                             struct tevent_context *ev,
 401                                             struct wb_context *wb_ctx,
 402                                             bool need_priv)
 403 {
 404         struct tevent_req *result, *subreq;
 405         struct wb_open_pipe_state *state;
 406
 407         result = tevent_req_create(mem_ctx, &state, struct wb_open_pipe_state);
 408         if (result == NULL) {
 409                 return NULL;
 410         }
 411         state->wb_ctx = wb_ctx;
 412         state->ev = ev;
 413         state->need_priv = need_priv;
 414
 415         if (wb_ctx->fd != -1) {
 416                 close(wb_ctx->fd);
 417                 wb_ctx->fd = -1;
 418         }
 419
 420         subreq = wb_connect_send(state, ev, wb_ctx, winbindd_socket_dir());
 421         if (subreq == NULL) {
 422                 goto fail;
 423         }
 424         tevent_req_set_callback(subreq, wb_open_pipe_connect_nonpriv_done,
 425                                 result);
 426         return result;
 427
 428  fail:
 429         TALLOC_FREE(result);
 430         return NULL;
 431 }
 432
 433 static void wb_open_pipe_connect_nonpriv_done(struct tevent_req *subreq)
 434 {
 435         struct tevent_req *req = tevent_req_callback_data(
 436                 subreq, struct tevent_req);
 437         struct wb_open_pipe_state *state = tevent_req_data(
 438                 req, struct wb_open_pipe_state);
 439         wbcErr wbc_err;
 440
 441         wbc_err = wb_connect_recv(subreq);
 442         TALLOC_FREE(subreq);
 443         if (!WBC_ERROR_IS_OK(wbc_err)) {
 444                 state->wb_ctx->is_priv = true;
 445                 tevent_req_error(req, wbc_err);
 446                 return;
 447         }
 448
 449         ZERO_STRUCT(state->wb_req);
 450         state->wb_req.cmd = WINBINDD_INTERFACE_VERSION;
 451
 452         subreq = wb_int_trans_send(state, state->ev, NULL, state->wb_ctx->fd,
 453                                    &state->wb_req);
 454         if (tevent_req_nomem(subreq, req)) {
 455                 return;
 456         }
 457         tevent_req_set_callback(subreq, wb_open_pipe_ping_done, req);
 458 }
 459
 460 static void wb_open_pipe_ping_done(struct tevent_req *subreq)
 461 {
 462         struct tevent_req *req = tevent_req_callback_data(
 463                 subreq, struct tevent_req);
 464         struct wb_open_pipe_state *state = tevent_req_data(
 465                 req, struct wb_open_pipe_state);
 466         struct winbindd_response *wb_resp;
 467         wbcErr wbc_err;
 468
 469         wbc_err = wb_int_trans_recv(subreq, state, &wb_resp);
 470         TALLOC_FREE(subreq);
 471         if (!WBC_ERROR_IS_OK(wbc_err)) {
 472                 tevent_req_error(req, wbc_err);
 473                 return;
 474         }
 475
 476         if (!state->need_priv) {
 477                 tevent_req_done(req);
 478                 return;
 479         }
 480
 481         state->wb_req.cmd = WINBINDD_PRIV_PIPE_DIR;
 482
 483         subreq = wb_int_trans_send(state, state->ev, NULL, state->wb_ctx->fd,
 484                                    &state->wb_req);
 485         if (tevent_req_nomem(subreq, req)) {
 486                 return;
 487         }
 488         tevent_req_set_callback(subreq, wb_open_pipe_getpriv_done, req);
 489 }
 490
 491 static void wb_open_pipe_getpriv_done(struct tevent_req *subreq)
 492 {
 493         struct tevent_req *req = tevent_req_callback_data(
 494                 subreq, struct tevent_req);
 495         struct wb_open_pipe_state *state = tevent_req_data(
 496                 req, struct wb_open_pipe_state);
 497         struct winbindd_response *wb_resp = NULL;
 498         wbcErr wbc_err;
 499
 500         wbc_err = wb_int_trans_recv(subreq, state, &wb_resp);
 501         TALLOC_FREE(subreq);
 502         if (!WBC_ERROR_IS_OK(wbc_err)) {
 503                 tevent_req_error(req, wbc_err);
 504                 return;
 505         }
 506
 507         close(state->wb_ctx->fd);
 508         state->wb_ctx->fd = -1;
 509
 510         subreq = wb_connect_send(state, state->ev, state->wb_ctx,
 511                                   (char *)wb_resp->extra_data.data);
 512         TALLOC_FREE(wb_resp);
 513         if (tevent_req_nomem(subreq, req)) {
 514                 return;
 515         }
 516         tevent_req_set_callback(subreq, wb_open_pipe_connect_priv_done, req);
 517 }
 518
 519 static void wb_open_pipe_connect_priv_done(struct tevent_req *subreq)
 520 {
 521         struct tevent_req *req = tevent_req_callback_data(
 522                 subreq, struct tevent_req);
 523         struct wb_open_pipe_state *state = tevent_req_data(
 524                 req, struct wb_open_pipe_state);
 525         wbcErr wbc_err;
 526
 527         wbc_err = wb_connect_recv(subreq);
 528         TALLOC_FREE(subreq);
 529         if (!WBC_ERROR_IS_OK(wbc_err)) {
 530                 tevent_req_error(req, wbc_err);
 531                 return;
 532         }
 533         state->wb_ctx->is_priv = true;
 534         tevent_req_done(req);
 535 }
 536
 537 static wbcErr wb_open_pipe_recv(struct tevent_req *req)
 538 {
 539         return tevent_req_simple_recv_wbcerr(req);
 540 }
 541
 542 struct wb_trans_state {
 543         struct wb_trans_state *prev, *next;
 544         struct wb_context *wb_ctx;
 545         struct tevent_context *ev;
 546         struct winbindd_request *wb_req;
 547         struct winbindd_response *wb_resp;
 548         int num_retries;
 549         bool need_priv;
 550 };
 551
 552 static void wb_trans_connect_done(struct tevent_req *subreq);
 553 static void wb_trans_done(struct tevent_req *subreq);
 554 static void wb_trans_retry_wait_done(struct tevent_req *subreq);
 555
 556 static void wb_trigger_trans(struct async_req *req)
 557 {
 558         struct wb_trans_state *state = talloc_get_type_abort(
 559                 req->private_data, struct wb_trans_state);
 560         struct tevent_req *subreq;
 561
 562         if ((state->wb_ctx->fd == -1)
 563             || (state->need_priv && !state->wb_ctx->is_priv)) {
 564
 565                 subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
 566                                            state->need_priv);
 567                 if (async_req_nomem(subreq, req)) {
 568                         return;
 569                 }
 570                 tevent_req_set_callback(subreq, wb_trans_connect_done, req);
 571                 return;
 572         }
 573
 574         subreq = wb_int_trans_send(state, state->ev, NULL, state->wb_ctx->fd,
 575                                    state->wb_req);
 576         if (async_req_nomem(subreq, req)) {
 577                 return;
 578         }
 579         tevent_req_set_callback(subreq, wb_trans_done, req);
 580 }
 581
 582 struct async_req *wb_trans_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 583                                 struct wb_context *wb_ctx, bool need_priv,
 584                                 struct winbindd_request *wb_req)
 585 {
 586         struct async_req *result;
 587         struct wb_trans_state *state;
 588
 589         if (!async_req_setup(mem_ctx, &result, &state,
 590                              struct wb_trans_state)) {
 591                 return NULL;
 592         }
 593         state->wb_ctx = wb_ctx;
 594         state->ev = ev;
 595         state->wb_req = wb_req;
 596         state->num_retries = 10;
 597         state->need_priv = need_priv;
 598
 599         if (!async_req_enqueue(wb_ctx->queue, ev, result, wb_trigger_trans)) {
 600                 goto fail;
 601         }
 602         return result;
 603
 604  fail:
 605         TALLOC_FREE(result);
 606         return NULL;
 607 }
 608
 609 static bool wb_trans_retry(struct async_req *req,
 610                            struct wb_trans_state *state,
 611                            wbcErr wbc_err)
 612 {
 613         struct tevent_req *subreq;
 614
 615         if (WBC_ERROR_IS_OK(wbc_err)) {
 616                 return false;
 617         }
 618
 619         if (wbc_err == WBC_ERR_WINBIND_NOT_AVAILABLE) {
 620                 /*
 621                  * Winbind not around or we can't connect to the pipe. Fail
 622                  * immediately.
 623                  */
 624                 async_req_error(req, wbc_err);
 625                 return true;
 626         }
 627
 628         state->num_retries -= 1;
 629         if (state->num_retries == 0) {
 630                 async_req_error(req, wbc_err);
 631                 return true;
 632         }
 633
 634         /*
 635          * The transfer as such failed, retry after one second
 636          */
 637
 638         if (state->wb_ctx->fd != -1) {
 639                 close(state->wb_ctx->fd);
 640                 state->wb_ctx->fd = -1;
 641         }
 642
 643         subreq = tevent_wakeup_send(state, state->ev,
 644                                     timeval_current_ofs(1, 0));
 645         if (async_req_nomem(subreq, req)) {
 646                 return true;
 647         }
 648         tevent_req_set_callback(subreq, wb_trans_retry_wait_done, req);
 649         return true;
 650 }
 651
 652 static void wb_trans_retry_wait_done(struct tevent_req *subreq)
 653 {
 654         struct async_req *req = tevent_req_callback_data(
 655                 subreq, struct async_req);
 656         struct wb_trans_state *state = talloc_get_type_abort(
 657                 req->private_data, struct wb_trans_state);
 658         bool ret;
 659
 660         ret = tevent_wakeup_recv(subreq);
 661         TALLOC_FREE(subreq);
 662         if (!ret) {
 663                 async_req_error(req, WBC_ERR_UNKNOWN_FAILURE);
 664                 return;
 665         }
 666
 667         subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
 668                                     state->need_priv);
 669         if (async_req_nomem(subreq, req)) {
 670                 return;
 671         }
 672         tevent_req_set_callback(subreq, wb_trans_connect_done, req);
 673 }
 674
 675 static void wb_trans_connect_done(struct tevent_req *subreq)
 676 {
 677         struct async_req *req = tevent_req_callback_data(
 678                 subreq, struct async_req);
 679         struct wb_trans_state *state = talloc_get_type_abort(
 680                 req->private_data, struct wb_trans_state);
 681         struct tevent_req *subreq2;
 682         wbcErr wbc_err;
 683
 684         wbc_err = wb_open_pipe_recv(subreq);
 685         TALLOC_FREE(subreq);
 686
 687         if (wb_trans_retry(req, state, wbc_err)) {
 688                 return;
 689         }
 690
 691         subreq2 = wb_int_trans_send(state, state->ev, NULL, state->wb_ctx->fd,
 692                                     state->wb_req);
 693         if (async_req_nomem(subreq2, req)) {
 694                 return;
 695         }
 696         tevent_req_set_callback(subreq2, wb_trans_done, req);
 697 }
 698
 699 static void wb_trans_done(struct tevent_req *subreq)
 700 {
 701         struct async_req *req = tevent_req_callback_data(
 702                 subreq, struct async_req);
 703         struct wb_trans_state *state = talloc_get_type_abort(
 704                 req->private_data, struct wb_trans_state);
 705         wbcErr wbc_err;
 706
 707         wbc_err = wb_int_trans_recv(subreq, state, &state->wb_resp);
 708         TALLOC_FREE(subreq);
 709
 710         if (wb_trans_retry(req, state, wbc_err)) {
 711                 return;
 712         }
 713
 714         async_req_done(req);
 715 }
 716
 717 wbcErr wb_trans_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
 718                      struct winbindd_response **presponse)
 719 {
 720         struct wb_trans_state *state = talloc_get_type_abort(
 721                 req->private_data, struct wb_trans_state);
 722         wbcErr wbc_err;
 723
 724         if (async_req_is_wbcerr(req, &wbc_err)) {
 725                 return wbc_err;
 726         }
 727
 728         *presponse = talloc_move(mem_ctx, &state->wb_resp);
 729         return WBC_ERR_SUCCESS;
 730 }