source3/smbd/smb2_ioctl.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "../lib/util/tevent_ntstatus.h"
  26 #include "rpc_server/srv_pipe_hnd.h"
  27 #include "include/ntioctl.h"
  28
  29 static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
  30                                                struct tevent_context *ev,
  31                                                struct smbd_smb2_request *smb2req,
  32                                                uint32_t in_ctl_code,
  33                                                uint64_t in_file_id_volatile,
  34                                                DATA_BLOB in_input,
  35                                                uint32_t in_max_output,
  36                                                uint32_t in_flags);
  37 static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
  38                                      TALLOC_CTX *mem_ctx,
  39                                      DATA_BLOB *out_output);
  40
  41 static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq);
  42 NTSTATUS smbd_smb2_request_process_ioctl(struct smbd_smb2_request *req)
  43 {
  44         NTSTATUS status;
  45         const uint8_t *inbody;
  46         int i = req->current_idx;
  47         uint32_t in_ctl_code;
  48         uint64_t in_file_id_persistent;
  49         uint64_t in_file_id_volatile;
  50         uint32_t in_input_offset;
  51         uint32_t in_input_length;
  52         DATA_BLOB in_input_buffer;
  53         uint32_t in_max_output_length;
  54         uint32_t in_flags;
  55         struct tevent_req *subreq;
  56
  57         status = smbd_smb2_request_verify_sizes(req, 0x39);
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 return smbd_smb2_request_error(req, status);
  60         }
  61         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  62
  63         in_ctl_code             = IVAL(inbody, 0x04);
  64         in_file_id_persistent   = BVAL(inbody, 0x08);
  65         in_file_id_volatile     = BVAL(inbody, 0x10);
  66         in_input_offset         = IVAL(inbody, 0x18);
  67         in_input_length         = IVAL(inbody, 0x1C);
  68         in_max_output_length    = IVAL(inbody, 0x2C);
  69         in_flags                = IVAL(inbody, 0x30);
  70
  71         if (in_input_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
  72                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  73         }
  74
  75         if (in_input_length > req->in.vector[i+2].iov_len) {
  76                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  77         }
  78
  79         in_input_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  80         in_input_buffer.length = in_input_length;
  81
  82         if (req->compat_chain_fsp) {
  83                 /* skip check */
  84         } else if (in_file_id_persistent == UINT64_MAX &&
  85                    in_file_id_volatile == UINT64_MAX) {
  86                 /* without a handle */
  87         } else if (in_file_id_persistent != in_file_id_volatile) {
  88                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  89         }
  90
  91         subreq = smbd_smb2_ioctl_send(req,
  92                                       req->sconn->smb2.event_ctx,
  93                                       req,
  94                                       in_ctl_code,
  95                                       in_file_id_volatile,
  96                                       in_input_buffer,
  97                                       in_max_output_length,
  98                                       in_flags);
  99         if (subreq == NULL) {
 100                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 101         }
 102         tevent_req_set_callback(subreq, smbd_smb2_request_ioctl_done, req);
 103
 104         return smbd_smb2_request_pending_queue(req, subreq);
 105 }
 106
 107 static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq)
 108 {
 109         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 110                                         struct smbd_smb2_request);
 111         const uint8_t *inbody;
 112         int i = req->current_idx;
 113         uint8_t *outhdr;
 114         DATA_BLOB outbody;
 115         DATA_BLOB outdyn;
 116         uint32_t in_ctl_code;
 117         uint64_t in_file_id_persistent;
 118         uint64_t in_file_id_volatile;
 119         uint32_t out_input_offset;
 120         uint32_t out_output_offset;
 121         DATA_BLOB out_output_buffer = data_blob_null;
 122         NTSTATUS status;
 123         NTSTATUS error; /* transport error */
 124
 125         status = smbd_smb2_ioctl_recv(subreq, req, &out_output_buffer);
 126
 127         DEBUG(10,("smbd_smb2_request_ioctl_done: smbd_smb2_ioctl_recv returned "
 128                 "%u status %s\n",
 129                 (unsigned int)out_output_buffer.length,
 130                 nt_errstr(status) ));
 131
 132         TALLOC_FREE(subreq);
 133         if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 134                 /* also ok */
 135         } else if (!NT_STATUS_IS_OK(status)) {
 136                 error = smbd_smb2_request_error(req, status);
 137                 if (!NT_STATUS_IS_OK(error)) {
 138                         smbd_server_connection_terminate(req->sconn,
 139                                                          nt_errstr(error));
 140                         return;
 141                 }
 142                 return;
 143         }
 144
 145         out_input_offset = SMB2_HDR_BODY + 0x30;
 146         out_output_offset = SMB2_HDR_BODY + 0x30;
 147
 148         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 149
 150         in_ctl_code             = IVAL(inbody, 0x04);
 151         in_file_id_persistent   = BVAL(inbody, 0x08);
 152         in_file_id_volatile     = BVAL(inbody, 0x10);
 153
 154         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 155
 156         outbody = data_blob_talloc(req->out.vector, NULL, 0x30);
 157         if (outbody.data == NULL) {
 158                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 159                 if (!NT_STATUS_IS_OK(error)) {
 160                         smbd_server_connection_terminate(req->sconn,
 161                                                          nt_errstr(error));
 162                         return;
 163                 }
 164                 return;
 165         }
 166
 167         SSVAL(outbody.data, 0x00, 0x30 + 1);    /* struct size */
 168         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 169         SIVAL(outbody.data, 0x04,
 170               in_ctl_code);                     /* ctl code */
 171         SBVAL(outbody.data, 0x08,
 172               in_file_id_persistent);           /* file id (persistent) */
 173         SBVAL(outbody.data, 0x10,
 174               in_file_id_volatile);             /* file id (volatile) */
 175         SIVAL(outbody.data, 0x18,
 176               out_input_offset);                /* input offset */
 177         SIVAL(outbody.data, 0x1C, 0);           /* input count */
 178         SIVAL(outbody.data, 0x20,
 179               out_output_offset);               /* output offset */
 180         SIVAL(outbody.data, 0x24,
 181               out_output_buffer.length);        /* output count */
 182         SIVAL(outbody.data, 0x28, 0);           /* flags */
 183         SIVAL(outbody.data, 0x2C, 0);           /* reserved */
 184
 185         /*
 186          * Note: Windows Vista and 2008 send back also the
 187          *       input from the request. But it was fixed in
 188          *       Windows 7.
 189          */
 190         outdyn = out_output_buffer;
 191
 192         error = smbd_smb2_request_done_ex(req, status, outbody, &outdyn,
 193                                           __location__);
 194         if (!NT_STATUS_IS_OK(error)) {
 195                 smbd_server_connection_terminate(req->sconn,
 196                                                  nt_errstr(error));
 197                 return;
 198         }
 199 }
 200
 201 struct smbd_smb2_ioctl_state {
 202         struct smbd_smb2_request *smb2req;
 203         struct smb_request *smbreq;
 204         files_struct *fsp;
 205         DATA_BLOB in_input;
 206         uint32_t in_max_output;
 207         DATA_BLOB out_output;
 208 };
 209
 210 static void smbd_smb2_ioctl_pipe_write_done(struct tevent_req *subreq);
 211 static void smbd_smb2_ioctl_pipe_read_done(struct tevent_req *subreq);
 212
 213 static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
 214                                                struct tevent_context *ev,
 215                                                struct smbd_smb2_request *smb2req,
 216                                                uint32_t in_ctl_code,
 217                                                uint64_t in_file_id_volatile,
 218                                                DATA_BLOB in_input,
 219                                                uint32_t in_max_output,
 220                                                uint32_t in_flags)
 221 {
 222         struct tevent_req *req;
 223         struct smbd_smb2_ioctl_state *state;
 224         struct smb_request *smbreq;
 225         files_struct *fsp = NULL;
 226         struct tevent_req *subreq;
 227
 228         req = tevent_req_create(mem_ctx, &state,
 229                                 struct smbd_smb2_ioctl_state);
 230         if (req == NULL) {
 231                 return NULL;
 232         }
 233         state->smb2req = smb2req;
 234         state->smbreq = NULL;
 235         state->fsp = NULL;
 236         state->in_input = in_input;
 237         state->in_max_output = in_max_output;
 238         state->out_output = data_blob_null;
 239
 240         DEBUG(10, ("smbd_smb2_ioctl: ctl_code[0x%08x] file_id[0x%016llX]\n",
 241                    (unsigned)in_ctl_code,
 242                    (unsigned long long)in_file_id_volatile));
 243
 244         smbreq = smbd_smb2_fake_smb_request(smb2req);
 245         if (tevent_req_nomem(smbreq, req)) {
 246                 return tevent_req_post(req, ev);
 247         }
 248         state->smbreq = smbreq;
 249
 250         if (in_file_id_volatile != UINT64_MAX) {
 251                 fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 252                 if (fsp == NULL) {
 253                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 254                         return tevent_req_post(req, ev);
 255                 }
 256                 if (smbreq->conn != fsp->conn) {
 257                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 258                         return tevent_req_post(req, ev);
 259                 }
 260                 if (smb2req->session->vuid != fsp->vuid) {
 261                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 262                         return tevent_req_post(req, ev);
 263                 }
 264                 state->fsp = fsp;
 265         }
 266
 267         switch (in_ctl_code) {
 268         case 0x00060194: /* FSCTL_DFS_GET_REFERRALS */
 269         {
 270                 uint16_t in_max_referral_level;
 271                 DATA_BLOB in_file_name_buffer;
 272                 char *in_file_name_string;
 273                 size_t in_file_name_string_size;
 274                 bool ok;
 275                 bool overflow = false;
 276                 NTSTATUS status;
 277                 int dfs_size;
 278                 char *dfs_data = NULL;
 279
 280                 if (!IS_IPC(smbreq->conn)) {
 281                         tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 282                         return tevent_req_post(req, ev);
 283                 }
 284
 285                 if (!lp_host_msdfs()) {
 286                         tevent_req_nterror(req, NT_STATUS_FS_DRIVER_REQUIRED);
 287                         return tevent_req_post(req, ev);
 288                 }
 289
 290                 if (in_input.length < (2 + 2)) {
 291                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 292                         return tevent_req_post(req, ev);
 293                 }
 294
 295                 in_max_referral_level = SVAL(in_input.data, 0);
 296                 in_file_name_buffer.data = in_input.data + 2;
 297                 in_file_name_buffer.length = in_input.length - 2;
 298
 299                 ok = convert_string_talloc(state, CH_UTF16, CH_UNIX,
 300                                            in_file_name_buffer.data,
 301                                            in_file_name_buffer.length,
 302                                            &in_file_name_string,
 303                                            &in_file_name_string_size);
 304                 if (!ok) {
 305                         tevent_req_nterror(req, NT_STATUS_ILLEGAL_CHARACTER);
 306                         return tevent_req_post(req, ev);
 307                 }
 308
 309                 dfs_size = setup_dfs_referral(smbreq->conn,
 310                                               in_file_name_string,
 311                                               in_max_referral_level,
 312                                               &dfs_data, &status);
 313                 if (dfs_size < 0) {
 314                         tevent_req_nterror(req, status);
 315                         return tevent_req_post(req, ev);
 316                 }
 317
 318                 if (dfs_size > in_max_output) {
 319                         /*
 320                          * TODO: we need a testsuite for this
 321                          */
 322                         overflow = true;
 323                         dfs_size = in_max_output;
 324                 }
 325
 326                 state->out_output = data_blob_talloc(state,
 327                                                      (uint8_t *)dfs_data,
 328                                                      dfs_size);
 329                 SAFE_FREE(dfs_data);
 330                 if (dfs_size > 0 &&
 331                     tevent_req_nomem(state->out_output.data, req)) {
 332                         return tevent_req_post(req, ev);
 333                 }
 334
 335                 if (overflow) {
 336                         tevent_req_nterror(req, STATUS_BUFFER_OVERFLOW);
 337                 } else {
 338                         tevent_req_done(req);
 339                 }
 340                 return tevent_req_post(req, ev);
 341         }
 342         case 0x0011C017: /* FSCTL_PIPE_TRANSCEIVE */
 343
 344                 if (!IS_IPC(smbreq->conn)) {
 345                         tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 346                         return tevent_req_post(req, ev);
 347                 }
 348
 349                 if (fsp == NULL) {
 350                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 351                         return tevent_req_post(req, ev);
 352                 }
 353
 354                 if (!fsp_is_np(fsp)) {
 355                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 356                         return tevent_req_post(req, ev);
 357                 }
 358
 359                 DEBUG(10,("smbd_smb2_ioctl_send: np_write_send of size %u\n",
 360                         (unsigned int)in_input.length ));
 361
 362                 subreq = np_write_send(state, ev,
 363                                        fsp->fake_file_handle,
 364                                        in_input.data,
 365                                        in_input.length);
 366                 if (tevent_req_nomem(subreq, req)) {
 367                         return tevent_req_post(req, ev);
 368                 }
 369                 tevent_req_set_callback(subreq,
 370                                         smbd_smb2_ioctl_pipe_write_done,
 371                                         req);
 372                 return req;
 373
 374         case 0x00144064:        /* FSCTL_SRV_ENUMERATE_SNAPSHOTS */
 375         {
 376                 /*
 377                  * This is called to retrieve the number of Shadow Copies (a.k.a. snapshots)
 378                  * and return their volume names.  If max_data_count is 16, then it is just
 379                  * asking for the number of volumes and length of the combined names.
 380                  *
 381                  * pdata is the data allocated by our caller, but that uses
 382                  * total_data_count (which is 0 in our case) rather than max_data_count.
 383                  * Allocate the correct amount and return the pointer to let
 384                  * it be deallocated when we return.
 385                  */
 386                 struct shadow_copy_data *shadow_data = NULL;
 387                 bool labels = False;
 388                 uint32_t labels_data_count = 0;
 389                 uint32_t data_count;
 390                 uint32_t i;
 391                 char *pdata;
 392                 NTSTATUS status;
 393
 394                 if (fsp == NULL) {
 395                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 396                         return tevent_req_post(req, ev);
 397                 }
 398
 399                 if (in_max_output < 16) {
 400                         DEBUG(0,("FSCTL_GET_SHADOW_COPY_DATA: "
 401                                  "in_max_output(%u) < 16 is invalid!\n",
 402                                  in_max_output));
 403                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 404                         return tevent_req_post(req, ev);
 405                 }
 406
 407                 if (in_max_output > 16) {
 408                         labels = True;
 409                 }
 410
 411                 shadow_data = talloc_zero(talloc_tos(),
 412                                             struct shadow_copy_data);
 413                 if (tevent_req_nomem(shadow_data, req)) {
 414                         DEBUG(0,("TALLOC_ZERO() failed!\n"));
 415                         return tevent_req_post(req, ev);
 416                 }
 417
 418                 /*
 419                  * Call the VFS routine to actually do the work.
 420                  */
 421                 if (SMB_VFS_GET_SHADOW_COPY_DATA(fsp, shadow_data, labels)
 422                     != 0) {
 423                         if (errno == ENOSYS) {
 424                                 DEBUG(5, ("FSCTL_GET_SHADOW_COPY_DATA: "
 425                                           "connectpath %s, not supported.\n",
 426                                           smbreq->conn->connectpath));
 427                                 status = NT_STATUS_NOT_SUPPORTED;
 428                         } else {
 429                                 DEBUG(0,("FSCTL_GET_SHADOW_COPY_DATA: "
 430                                          "connectpath %s, failed.\n",
 431                                          smbreq->conn->connectpath));
 432                                 status = map_nt_error_from_unix(errno);
 433                         }
 434                         TALLOC_FREE(shadow_data);
 435                         tevent_req_nterror(req, status);
 436                         return tevent_req_post(req, ev);
 437                 }
 438
 439                 labels_data_count =
 440                         (shadow_data->num_volumes*2*sizeof(SHADOW_COPY_LABEL))
 441                         + 2;
 442
 443                 if (labels) {
 444                         data_count = 12+labels_data_count+4;
 445                 } else {
 446                         data_count = 16;
 447                 }
 448
 449                 if (labels && (in_max_output < data_count)) {
 450                         DEBUG(0, ("FSCTL_GET_SHADOW_COPY_DATA: "
 451                                   "in_max_output(%u) too small (%u) bytes "
 452                                   "needed!\n", in_max_output, data_count));
 453                         TALLOC_FREE(shadow_data);
 454                         tevent_req_nterror(req, NT_STATUS_BUFFER_TOO_SMALL);
 455                         return tevent_req_post(req, ev);
 456                 }
 457
 458                 state->out_output = data_blob_talloc(state, NULL, data_count);
 459                 if (tevent_req_nomem(state->out_output.data, req)) {
 460                         return tevent_req_post(req, ev);
 461                 }
 462
 463                 pdata = (char *)state->out_output.data;
 464
 465                 /* num_volumes 4 bytes */
 466                 SIVAL(pdata, 0, shadow_data->num_volumes);
 467
 468                 if (labels) {
 469                         /* num_labels 4 bytes */
 470                         SIVAL(pdata, 4, shadow_data->num_volumes);
 471                 }
 472
 473                 /* needed_data_count 4 bytes */
 474                 SIVAL(pdata, 8, labels_data_count+4);
 475
 476                 pdata += 12;
 477
 478                 DEBUG(10,("FSCTL_GET_SHADOW_COPY_DATA: %u volumes for "
 479                           "path[%s].\n",
 480                           shadow_data->num_volumes, fsp_str_dbg(fsp)));
 481                 if (labels && shadow_data->labels) {
 482                         for (i=0; i<shadow_data->num_volumes; i++) {
 483                                 srvstr_push(pdata, smbreq->flags2,
 484                                             pdata, shadow_data->labels[i],
 485                                             2*sizeof(SHADOW_COPY_LABEL),
 486                                             STR_UNICODE|STR_TERMINATE);
 487                                 pdata += 2*sizeof(SHADOW_COPY_LABEL);
 488                                 DEBUGADD(10, ("Label[%u]: '%s'\n", i,
 489                                               shadow_data->labels[i]));
 490                         }
 491                 }
 492
 493                 TALLOC_FREE(shadow_data);
 494
 495                 tevent_req_done(req);
 496                 return tevent_req_post(req, ev);
 497         }
 498
 499         default:
 500                 if (IS_IPC(smbreq->conn)) {
 501                         tevent_req_nterror(req, NT_STATUS_FS_DRIVER_REQUIRED);
 502                         return tevent_req_post(req, ev);
 503                 }
 504                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 505                 return tevent_req_post(req, ev);
 506         }
 507
 508         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 509         return tevent_req_post(req, ev);
 510 }
 511
 512 static void smbd_smb2_ioctl_pipe_write_done(struct tevent_req *subreq)
 513 {
 514         struct tevent_req *req = tevent_req_callback_data(subreq,
 515                                  struct tevent_req);
 516         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 517                                               struct smbd_smb2_ioctl_state);
 518         NTSTATUS status;
 519         ssize_t nwritten = -1;
 520
 521         status = np_write_recv(subreq, &nwritten);
 522
 523         DEBUG(10,("smbd_smb2_ioctl_pipe_write_done: received %ld\n",
 524                 (long int)nwritten ));
 525
 526         TALLOC_FREE(subreq);
 527         if (!NT_STATUS_IS_OK(status)) {
 528                 tevent_req_nterror(req, status);
 529                 return;
 530         }
 531
 532         if (nwritten != state->in_input.length) {
 533                 tevent_req_nterror(req, NT_STATUS_PIPE_NOT_AVAILABLE);
 534                 return;
 535         }
 536
 537         state->out_output = data_blob_talloc(state, NULL, state->in_max_output);
 538         if (state->in_max_output > 0 &&
 539             tevent_req_nomem(state->out_output.data, req)) {
 540                 return;
 541         }
 542
 543         DEBUG(10,("smbd_smb2_ioctl_pipe_write_done: issuing np_read_send "
 544                 "of size %u\n",
 545                 (unsigned int)state->out_output.length ));
 546
 547         TALLOC_FREE(subreq);
 548         subreq = np_read_send(state->smbreq->conn,
 549                               state->smb2req->sconn->smb2.event_ctx,
 550                               state->fsp->fake_file_handle,
 551                               state->out_output.data,
 552                               state->out_output.length);
 553         if (tevent_req_nomem(subreq, req)) {
 554                 return;
 555         }
 556         tevent_req_set_callback(subreq, smbd_smb2_ioctl_pipe_read_done, req);
 557 }
 558
 559 static void smbd_smb2_ioctl_pipe_read_done(struct tevent_req *subreq)
 560 {
 561         struct tevent_req *req = tevent_req_callback_data(subreq,
 562                                  struct tevent_req);
 563         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 564                                               struct smbd_smb2_ioctl_state);
 565         NTSTATUS status;
 566         ssize_t nread = -1;
 567         bool is_data_outstanding = false;
 568
 569         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 570
 571         DEBUG(10,("smbd_smb2_ioctl_pipe_read_done: np_read_recv nread = %d "
 572                  "is_data_outstanding = %d, status = %s\n",
 573                 (int)nread,
 574                 (int)is_data_outstanding,
 575                 nt_errstr(status) ));
 576
 577         TALLOC_FREE(subreq);
 578         if (!NT_STATUS_IS_OK(status)) {
 579                 tevent_req_nterror(req, status);
 580                 return;
 581         }
 582
 583         state->out_output.length = nread;
 584
 585         if (is_data_outstanding) {
 586                 tevent_req_nterror(req, STATUS_BUFFER_OVERFLOW);
 587                 return;
 588         }
 589
 590         tevent_req_done(req);
 591 }
 592
 593 static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
 594                                      TALLOC_CTX *mem_ctx,
 595                                      DATA_BLOB *out_output)
 596 {
 597         NTSTATUS status = NT_STATUS_OK;
 598         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 599                                               struct smbd_smb2_ioctl_state);
 600
 601         if (tevent_req_is_nterror(req, &status)) {
 602                 if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 603                         tevent_req_received(req);
 604                         return status;
 605                 }
 606         }
 607
 608         *out_output = state->out_output;
 609         talloc_steal(mem_ctx, out_output->data);
 610
 611         tevent_req_received(req);
 612         return status;
 613 }