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         /*
  72          * InputOffset (4 bytes): The offset, in bytes, from the beginning of
  73          * the SMB2 header to the input data buffer. If no input data is
  74          * required for the FSCTL/IOCTL command being issued, the client SHOULD
  75          * set this value to 0.<49>
  76          * <49> If no input data is required for the FSCTL/IOCTL command being
  77          * issued, Windows-based clients set this field to any value.
  78          */
  79         if ((in_input_length > 0)
  80          && (in_input_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len))) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  82         }
  83
  84         if (in_input_length > req->in.vector[i+2].iov_len) {
  85                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  86         }
  87
  88         in_input_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  89         in_input_buffer.length = in_input_length;
  90
  91         if (req->compat_chain_fsp) {
  92                 /* skip check */
  93         } else if (in_file_id_persistent == UINT64_MAX &&
  94                    in_file_id_volatile == UINT64_MAX) {
  95                 /* without a handle */
  96         } else if (in_file_id_persistent != in_file_id_volatile) {
  97                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  98         }
  99
 100         subreq = smbd_smb2_ioctl_send(req,
 101                                       req->sconn->ev_ctx,
 102                                       req,
 103                                       in_ctl_code,
 104                                       in_file_id_volatile,
 105                                       in_input_buffer,
 106                                       in_max_output_length,
 107                                       in_flags);
 108         if (subreq == NULL) {
 109                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 110         }
 111         tevent_req_set_callback(subreq, smbd_smb2_request_ioctl_done, req);
 112
 113         return smbd_smb2_request_pending_queue(req, subreq, 1000);
 114 }
 115
 116 static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq)
 117 {
 118         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 119                                         struct smbd_smb2_request);
 120         const uint8_t *inbody;
 121         int i = req->current_idx;
 122         DATA_BLOB outbody;
 123         DATA_BLOB outdyn;
 124         uint32_t in_ctl_code;
 125         uint64_t in_file_id_persistent;
 126         uint64_t in_file_id_volatile;
 127         uint32_t out_input_offset;
 128         uint32_t out_output_offset;
 129         DATA_BLOB out_output_buffer = data_blob_null;
 130         NTSTATUS status;
 131         NTSTATUS error; /* transport error */
 132
 133         status = smbd_smb2_ioctl_recv(subreq, req, &out_output_buffer);
 134
 135         DEBUG(10,("smbd_smb2_request_ioctl_done: smbd_smb2_ioctl_recv returned "
 136                 "%u status %s\n",
 137                 (unsigned int)out_output_buffer.length,
 138                 nt_errstr(status) ));
 139
 140         TALLOC_FREE(subreq);
 141         if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 142                 /* also ok */
 143         } else if (!NT_STATUS_IS_OK(status)) {
 144                 error = smbd_smb2_request_error(req, status);
 145                 if (!NT_STATUS_IS_OK(error)) {
 146                         smbd_server_connection_terminate(req->sconn,
 147                                                          nt_errstr(error));
 148                         return;
 149                 }
 150                 return;
 151         }
 152
 153         out_input_offset = SMB2_HDR_BODY + 0x30;
 154         out_output_offset = SMB2_HDR_BODY + 0x30;
 155
 156         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 157
 158         in_ctl_code             = IVAL(inbody, 0x04);
 159         in_file_id_persistent   = BVAL(inbody, 0x08);
 160         in_file_id_volatile     = BVAL(inbody, 0x10);
 161
 162         outbody = data_blob_talloc(req->out.vector, NULL, 0x30);
 163         if (outbody.data == NULL) {
 164                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 165                 if (!NT_STATUS_IS_OK(error)) {
 166                         smbd_server_connection_terminate(req->sconn,
 167                                                          nt_errstr(error));
 168                         return;
 169                 }
 170                 return;
 171         }
 172
 173         SSVAL(outbody.data, 0x00, 0x30 + 1);    /* struct size */
 174         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 175         SIVAL(outbody.data, 0x04,
 176               in_ctl_code);                     /* ctl code */
 177         SBVAL(outbody.data, 0x08,
 178               in_file_id_persistent);           /* file id (persistent) */
 179         SBVAL(outbody.data, 0x10,
 180               in_file_id_volatile);             /* file id (volatile) */
 181         SIVAL(outbody.data, 0x18,
 182               out_input_offset);                /* input offset */
 183         SIVAL(outbody.data, 0x1C, 0);           /* input count */
 184         SIVAL(outbody.data, 0x20,
 185               out_output_offset);               /* output offset */
 186         SIVAL(outbody.data, 0x24,
 187               out_output_buffer.length);        /* output count */
 188         SIVAL(outbody.data, 0x28, 0);           /* flags */
 189         SIVAL(outbody.data, 0x2C, 0);           /* reserved */
 190
 191         /*
 192          * Note: Windows Vista and 2008 send back also the
 193          *       input from the request. But it was fixed in
 194          *       Windows 7.
 195          */
 196         outdyn = out_output_buffer;
 197
 198         error = smbd_smb2_request_done_ex(req, status, outbody, &outdyn,
 199                                           __location__);
 200         if (!NT_STATUS_IS_OK(error)) {
 201                 smbd_server_connection_terminate(req->sconn,
 202                                                  nt_errstr(error));
 203                 return;
 204         }
 205 }
 206
 207 struct smbd_smb2_ioctl_state {
 208         struct smbd_smb2_request *smb2req;
 209         struct smb_request *smbreq;
 210         files_struct *fsp;
 211         DATA_BLOB in_input;
 212         uint32_t in_max_output;
 213         DATA_BLOB out_output;
 214 };
 215
 216 static void smbd_smb2_ioctl_pipe_write_done(struct tevent_req *subreq);
 217 static void smbd_smb2_ioctl_pipe_read_done(struct tevent_req *subreq);
 218
 219 static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
 220                                                struct tevent_context *ev,
 221                                                struct smbd_smb2_request *smb2req,
 222                                                uint32_t in_ctl_code,
 223                                                uint64_t in_file_id_volatile,
 224                                                DATA_BLOB in_input,
 225                                                uint32_t in_max_output,
 226                                                uint32_t in_flags)
 227 {
 228         struct tevent_req *req;
 229         struct smbd_smb2_ioctl_state *state;
 230         struct smb_request *smbreq;
 231         files_struct *fsp = NULL;
 232         struct tevent_req *subreq;
 233
 234         req = tevent_req_create(mem_ctx, &state,
 235                                 struct smbd_smb2_ioctl_state);
 236         if (req == NULL) {
 237                 return NULL;
 238         }
 239         state->smb2req = smb2req;
 240         state->smbreq = NULL;
 241         state->fsp = NULL;
 242         state->in_input = in_input;
 243         state->in_max_output = in_max_output;
 244         state->out_output = data_blob_null;
 245
 246         DEBUG(10, ("smbd_smb2_ioctl: ctl_code[0x%08x] file_id[0x%016llX]\n",
 247                    (unsigned)in_ctl_code,
 248                    (unsigned long long)in_file_id_volatile));
 249
 250         smbreq = smbd_smb2_fake_smb_request(smb2req);
 251         if (tevent_req_nomem(smbreq, req)) {
 252                 return tevent_req_post(req, ev);
 253         }
 254         state->smbreq = smbreq;
 255
 256         if (in_file_id_volatile != UINT64_MAX) {
 257                 fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 258                 if (fsp == NULL) {
 259                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 260                         return tevent_req_post(req, ev);
 261                 }
 262                 if (smbreq->conn != fsp->conn) {
 263                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 264                         return tevent_req_post(req, ev);
 265                 }
 266                 if (smb2req->session->vuid != fsp->vuid) {
 267                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 268                         return tevent_req_post(req, ev);
 269                 }
 270                 state->fsp = fsp;
 271         }
 272
 273         switch (in_ctl_code) {
 274         case 0x00060194: /* FSCTL_DFS_GET_REFERRALS */
 275         {
 276                 uint16_t in_max_referral_level;
 277                 DATA_BLOB in_file_name_buffer;
 278                 char *in_file_name_string;
 279                 size_t in_file_name_string_size;
 280                 bool ok;
 281                 bool overflow = false;
 282                 NTSTATUS status;
 283                 int dfs_size;
 284                 char *dfs_data = NULL;
 285
 286                 if (!IS_IPC(smbreq->conn)) {
 287                         tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 288                         return tevent_req_post(req, ev);
 289                 }
 290
 291                 if (!lp_host_msdfs()) {
 292                         tevent_req_nterror(req, NT_STATUS_FS_DRIVER_REQUIRED);
 293                         return tevent_req_post(req, ev);
 294                 }
 295
 296                 if (in_input.length < (2 + 2)) {
 297                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 298                         return tevent_req_post(req, ev);
 299                 }
 300
 301                 in_max_referral_level = SVAL(in_input.data, 0);
 302                 in_file_name_buffer.data = in_input.data + 2;
 303                 in_file_name_buffer.length = in_input.length - 2;
 304
 305                 ok = convert_string_talloc(state, CH_UTF16, CH_UNIX,
 306                                            in_file_name_buffer.data,
 307                                            in_file_name_buffer.length,
 308                                            &in_file_name_string,
 309                                            &in_file_name_string_size);
 310                 if (!ok) {
 311                         tevent_req_nterror(req, NT_STATUS_ILLEGAL_CHARACTER);
 312                         return tevent_req_post(req, ev);
 313                 }
 314
 315                 dfs_size = setup_dfs_referral(smbreq->conn,
 316                                               in_file_name_string,
 317                                               in_max_referral_level,
 318                                               &dfs_data, &status);
 319                 if (dfs_size < 0) {
 320                         tevent_req_nterror(req, status);
 321                         return tevent_req_post(req, ev);
 322                 }
 323
 324                 if (dfs_size > in_max_output) {
 325                         /*
 326                          * TODO: we need a testsuite for this
 327                          */
 328                         overflow = true;
 329                         dfs_size = in_max_output;
 330                 }
 331
 332                 state->out_output = data_blob_talloc(state,
 333                                                      (uint8_t *)dfs_data,
 334                                                      dfs_size);
 335                 SAFE_FREE(dfs_data);
 336                 if (dfs_size > 0 &&
 337                     tevent_req_nomem(state->out_output.data, req)) {
 338                         return tevent_req_post(req, ev);
 339                 }
 340
 341                 if (overflow) {
 342                         tevent_req_nterror(req, STATUS_BUFFER_OVERFLOW);
 343                 } else {
 344                         tevent_req_done(req);
 345                 }
 346                 return tevent_req_post(req, ev);
 347         }
 348         case 0x0011C017: /* FSCTL_PIPE_TRANSCEIVE */
 349
 350                 if (!IS_IPC(smbreq->conn)) {
 351                         tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 352                         return tevent_req_post(req, ev);
 353                 }
 354
 355                 if (fsp == NULL) {
 356                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 357                         return tevent_req_post(req, ev);
 358                 }
 359
 360                 if (!fsp_is_np(fsp)) {
 361                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 362                         return tevent_req_post(req, ev);
 363                 }
 364
 365                 DEBUG(10,("smbd_smb2_ioctl_send: np_write_send of size %u\n",
 366                         (unsigned int)in_input.length ));
 367
 368                 subreq = np_write_send(state, ev,
 369                                        fsp->fake_file_handle,
 370                                        in_input.data,
 371                                        in_input.length);
 372                 if (tevent_req_nomem(subreq, req)) {
 373                         return tevent_req_post(req, ev);
 374                 }
 375                 tevent_req_set_callback(subreq,
 376                                         smbd_smb2_ioctl_pipe_write_done,
 377                                         req);
 378                 return req;
 379
 380         case 0x00144064:        /* FSCTL_SRV_ENUMERATE_SNAPSHOTS */
 381         {
 382                 /*
 383                  * This is called to retrieve the number of Shadow Copies (a.k.a. snapshots)
 384                  * and return their volume names.  If max_data_count is 16, then it is just
 385                  * asking for the number of volumes and length of the combined names.
 386                  *
 387                  * pdata is the data allocated by our caller, but that uses
 388                  * total_data_count (which is 0 in our case) rather than max_data_count.
 389                  * Allocate the correct amount and return the pointer to let
 390                  * it be deallocated when we return.
 391                  */
 392                 struct shadow_copy_data *shadow_data = NULL;
 393                 bool labels = False;
 394                 uint32_t labels_data_count = 0;
 395                 uint32_t data_count;
 396                 uint32_t i;
 397                 char *pdata;
 398                 NTSTATUS status;
 399
 400                 if (fsp == NULL) {
 401                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 402                         return tevent_req_post(req, ev);
 403                 }
 404
 405                 if (in_max_output < 16) {
 406                         DEBUG(0,("FSCTL_GET_SHADOW_COPY_DATA: "
 407                                  "in_max_output(%u) < 16 is invalid!\n",
 408                                  in_max_output));
 409                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 410                         return tevent_req_post(req, ev);
 411                 }
 412
 413                 if (in_max_output > 16) {
 414                         labels = True;
 415                 }
 416
 417                 shadow_data = talloc_zero(talloc_tos(),
 418                                             struct shadow_copy_data);
 419                 if (tevent_req_nomem(shadow_data, req)) {
 420                         DEBUG(0,("TALLOC_ZERO() failed!\n"));
 421                         return tevent_req_post(req, ev);
 422                 }
 423
 424                 /*
 425                  * Call the VFS routine to actually do the work.
 426                  */
 427                 if (SMB_VFS_GET_SHADOW_COPY_DATA(fsp, shadow_data, labels)
 428                     != 0) {
 429                         if (errno == ENOSYS) {
 430                                 DEBUG(5, ("FSCTL_GET_SHADOW_COPY_DATA: "
 431                                           "connectpath %s, not supported.\n",
 432                                           smbreq->conn->connectpath));
 433                                 status = NT_STATUS_NOT_SUPPORTED;
 434                         } else {
 435                                 DEBUG(0,("FSCTL_GET_SHADOW_COPY_DATA: "
 436                                          "connectpath %s, failed.\n",
 437                                          smbreq->conn->connectpath));
 438                                 status = map_nt_error_from_unix(errno);
 439                         }
 440                         TALLOC_FREE(shadow_data);
 441                         tevent_req_nterror(req, status);
 442                         return tevent_req_post(req, ev);
 443                 }
 444
 445                 labels_data_count =
 446                         (shadow_data->num_volumes*2*sizeof(SHADOW_COPY_LABEL))
 447                         + 2;
 448
 449                 if (labels) {
 450                         data_count = 12+labels_data_count+4;
 451                 } else {
 452                         data_count = 16;
 453                 }
 454
 455                 if (labels && (in_max_output < data_count)) {
 456                         DEBUG(0, ("FSCTL_GET_SHADOW_COPY_DATA: "
 457                                   "in_max_output(%u) too small (%u) bytes "
 458                                   "needed!\n", in_max_output, data_count));
 459                         TALLOC_FREE(shadow_data);
 460                         tevent_req_nterror(req, NT_STATUS_BUFFER_TOO_SMALL);
 461                         return tevent_req_post(req, ev);
 462                 }
 463
 464                 state->out_output = data_blob_talloc(state, NULL, data_count);
 465                 if (tevent_req_nomem(state->out_output.data, req)) {
 466                         return tevent_req_post(req, ev);
 467                 }
 468
 469                 pdata = (char *)state->out_output.data;
 470
 471                 /* num_volumes 4 bytes */
 472                 SIVAL(pdata, 0, shadow_data->num_volumes);
 473
 474                 if (labels) {
 475                         /* num_labels 4 bytes */
 476                         SIVAL(pdata, 4, shadow_data->num_volumes);
 477                 }
 478
 479                 /* needed_data_count 4 bytes */
 480                 SIVAL(pdata, 8, labels_data_count+4);
 481
 482                 pdata += 12;
 483
 484                 DEBUG(10,("FSCTL_GET_SHADOW_COPY_DATA: %u volumes for "
 485                           "path[%s].\n",
 486                           shadow_data->num_volumes, fsp_str_dbg(fsp)));
 487                 if (labels && shadow_data->labels) {
 488                         for (i=0; i<shadow_data->num_volumes; i++) {
 489                                 srvstr_push(pdata, smbreq->flags2,
 490                                             pdata, shadow_data->labels[i],
 491                                             2*sizeof(SHADOW_COPY_LABEL),
 492                                             STR_UNICODE|STR_TERMINATE);
 493                                 pdata += 2*sizeof(SHADOW_COPY_LABEL);
 494                                 DEBUGADD(10, ("Label[%u]: '%s'\n", i,
 495                                               shadow_data->labels[i]));
 496                         }
 497                 }
 498
 499                 TALLOC_FREE(shadow_data);
 500
 501                 tevent_req_done(req);
 502                 return tevent_req_post(req, ev);
 503         }
 504
 505         default:
 506                 if (IS_IPC(smbreq->conn)) {
 507                         tevent_req_nterror(req, NT_STATUS_FS_DRIVER_REQUIRED);
 508                         return tevent_req_post(req, ev);
 509                 }
 510                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 511                 return tevent_req_post(req, ev);
 512         }
 513
 514         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 515         return tevent_req_post(req, ev);
 516 }
 517
 518 static void smbd_smb2_ioctl_pipe_write_done(struct tevent_req *subreq)
 519 {
 520         struct tevent_req *req = tevent_req_callback_data(subreq,
 521                                  struct tevent_req);
 522         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 523                                               struct smbd_smb2_ioctl_state);
 524         NTSTATUS status;
 525         ssize_t nwritten = -1;
 526
 527         status = np_write_recv(subreq, &nwritten);
 528
 529         DEBUG(10,("smbd_smb2_ioctl_pipe_write_done: received %ld\n",
 530                 (long int)nwritten ));
 531
 532         TALLOC_FREE(subreq);
 533         if (!NT_STATUS_IS_OK(status)) {
 534                 tevent_req_nterror(req, status);
 535                 return;
 536         }
 537
 538         if (nwritten != state->in_input.length) {
 539                 tevent_req_nterror(req, NT_STATUS_PIPE_NOT_AVAILABLE);
 540                 return;
 541         }
 542
 543         state->out_output = data_blob_talloc(state, NULL, state->in_max_output);
 544         if (state->in_max_output > 0 &&
 545             tevent_req_nomem(state->out_output.data, req)) {
 546                 return;
 547         }
 548
 549         DEBUG(10,("smbd_smb2_ioctl_pipe_write_done: issuing np_read_send "
 550                 "of size %u\n",
 551                 (unsigned int)state->out_output.length ));
 552
 553         TALLOC_FREE(subreq);
 554         subreq = np_read_send(state->smbreq->conn,
 555                               state->smb2req->sconn->ev_ctx,
 556                               state->fsp->fake_file_handle,
 557                               state->out_output.data,
 558                               state->out_output.length);
 559         if (tevent_req_nomem(subreq, req)) {
 560                 return;
 561         }
 562         tevent_req_set_callback(subreq, smbd_smb2_ioctl_pipe_read_done, req);
 563 }
 564
 565 static void smbd_smb2_ioctl_pipe_read_done(struct tevent_req *subreq)
 566 {
 567         struct tevent_req *req = tevent_req_callback_data(subreq,
 568                                  struct tevent_req);
 569         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 570                                               struct smbd_smb2_ioctl_state);
 571         NTSTATUS status;
 572         ssize_t nread = -1;
 573         bool is_data_outstanding = false;
 574
 575         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 576
 577         DEBUG(10,("smbd_smb2_ioctl_pipe_read_done: np_read_recv nread = %d "
 578                  "is_data_outstanding = %d, status = %s\n",
 579                 (int)nread,
 580                 (int)is_data_outstanding,
 581                 nt_errstr(status) ));
 582
 583         TALLOC_FREE(subreq);
 584         if (!NT_STATUS_IS_OK(status)) {
 585                 tevent_req_nterror(req, status);
 586                 return;
 587         }
 588
 589         state->out_output.length = nread;
 590
 591         if (is_data_outstanding) {
 592                 tevent_req_nterror(req, STATUS_BUFFER_OVERFLOW);
 593                 return;
 594         }
 595
 596         tevent_req_done(req);
 597 }
 598
 599 static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
 600                                      TALLOC_CTX *mem_ctx,
 601                                      DATA_BLOB *out_output)
 602 {
 603         NTSTATUS status = NT_STATUS_OK;
 604         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 605                                               struct smbd_smb2_ioctl_state);
 606
 607         if (tevent_req_is_nterror(req, &status)) {
 608                 if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 609                         tevent_req_received(req);
 610                         return status;
 611                 }
 612         }
 613
 614         *out_output = state->out_output;
 615         talloc_steal(mem_ctx, out_output->data);
 616
 617         tevent_req_received(req);
 618         return status;
 619 }