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