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->smb2.event_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);
 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         uint8_t *outhdr;
 123         DATA_BLOB outbody;
 124         DATA_BLOB outdyn;
 125         uint32_t in_ctl_code;
 126         uint64_t in_file_id_persistent;
 127         uint64_t in_file_id_volatile;
 128         uint32_t out_input_offset;
 129         uint32_t out_output_offset;
 130         DATA_BLOB out_output_buffer = data_blob_null;
 131         NTSTATUS status;
 132         NTSTATUS error; /* transport error */
 133
 134         status = smbd_smb2_ioctl_recv(subreq, req, &out_output_buffer);
 135
 136         DEBUG(10,("smbd_smb2_request_ioctl_done: smbd_smb2_ioctl_recv returned "
 137                 "%u status %s\n",
 138                 (unsigned int)out_output_buffer.length,
 139                 nt_errstr(status) ));
 140
 141         TALLOC_FREE(subreq);
 142         if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 143                 /* also ok */
 144         } else if (!NT_STATUS_IS_OK(status)) {
 145                 error = smbd_smb2_request_error(req, status);
 146                 if (!NT_STATUS_IS_OK(error)) {
 147                         smbd_server_connection_terminate(req->sconn,
 148                                                          nt_errstr(error));
 149                         return;
 150                 }
 151                 return;
 152         }
 153
 154         out_input_offset = SMB2_HDR_BODY + 0x30;
 155         out_output_offset = SMB2_HDR_BODY + 0x30;
 156
 157         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 158
 159         in_ctl_code             = IVAL(inbody, 0x04);
 160         in_file_id_persistent   = BVAL(inbody, 0x08);
 161         in_file_id_volatile     = BVAL(inbody, 0x10);
 162
 163         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 164
 165         outbody = data_blob_talloc(req->out.vector, NULL, 0x30);
 166         if (outbody.data == NULL) {
 167                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 168                 if (!NT_STATUS_IS_OK(error)) {
 169                         smbd_server_connection_terminate(req->sconn,
 170                                                          nt_errstr(error));
 171                         return;
 172                 }
 173                 return;
 174         }
 175
 176         SSVAL(outbody.data, 0x00, 0x30 + 1);    /* struct size */
 177         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 178         SIVAL(outbody.data, 0x04,
 179               in_ctl_code);                     /* ctl code */
 180         SBVAL(outbody.data, 0x08,
 181               in_file_id_persistent);           /* file id (persistent) */
 182         SBVAL(outbody.data, 0x10,
 183               in_file_id_volatile);             /* file id (volatile) */
 184         SIVAL(outbody.data, 0x18,
 185               out_input_offset);                /* input offset */
 186         SIVAL(outbody.data, 0x1C, 0);           /* input count */
 187         SIVAL(outbody.data, 0x20,
 188               out_output_offset);               /* output offset */
 189         SIVAL(outbody.data, 0x24,
 190               out_output_buffer.length);        /* output count */
 191         SIVAL(outbody.data, 0x28, 0);           /* flags */
 192         SIVAL(outbody.data, 0x2C, 0);           /* reserved */
 193
 194         /*
 195          * Note: Windows Vista and 2008 send back also the
 196          *       input from the request. But it was fixed in
 197          *       Windows 7.
 198          */
 199         outdyn = out_output_buffer;
 200
 201         error = smbd_smb2_request_done_ex(req, status, outbody, &outdyn,
 202                                           __location__);
 203         if (!NT_STATUS_IS_OK(error)) {
 204                 smbd_server_connection_terminate(req->sconn,
 205                                                  nt_errstr(error));
 206                 return;
 207         }
 208 }
 209
 210 struct smbd_smb2_ioctl_state {
 211         struct smbd_smb2_request *smb2req;
 212         struct smb_request *smbreq;
 213         files_struct *fsp;
 214         DATA_BLOB in_input;
 215         uint32_t in_max_output;
 216         DATA_BLOB out_output;
 217 };
 218
 219 static void smbd_smb2_ioctl_pipe_write_done(struct tevent_req *subreq);
 220 static void smbd_smb2_ioctl_pipe_read_done(struct tevent_req *subreq);
 221
 222 static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
 223                                                struct tevent_context *ev,
 224                                                struct smbd_smb2_request *smb2req,
 225                                                uint32_t in_ctl_code,
 226                                                uint64_t in_file_id_volatile,
 227                                                DATA_BLOB in_input,
 228                                                uint32_t in_max_output,
 229                                                uint32_t in_flags)
 230 {
 231         struct tevent_req *req;
 232         struct smbd_smb2_ioctl_state *state;
 233         struct smb_request *smbreq;
 234         files_struct *fsp = NULL;
 235         struct tevent_req *subreq;
 236
 237         req = tevent_req_create(mem_ctx, &state,
 238                                 struct smbd_smb2_ioctl_state);
 239         if (req == NULL) {
 240                 return NULL;
 241         }
 242         state->smb2req = smb2req;
 243         state->smbreq = NULL;
 244         state->fsp = NULL;
 245         state->in_input = in_input;
 246         state->in_max_output = in_max_output;
 247         state->out_output = data_blob_null;
 248
 249         DEBUG(10,("smbd_smb2_ioctl: file_id[0x%016llX]\n",
 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, false);
 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 (fsp == NULL) {
 403                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 404                         return tevent_req_post(req, ev);
 405                 }
 406
 407                 if (in_max_output < 16) {
 408                         DEBUG(0,("FSCTL_GET_SHADOW_COPY_DATA: "
 409                                  "in_max_output(%u) < 16 is invalid!\n",
 410                                  in_max_output));
 411                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 412                         return tevent_req_post(req, ev);
 413                 }
 414
 415                 if (in_max_output > 16) {
 416                         labels = True;
 417                 }
 418
 419                 shadow_data = TALLOC_ZERO_P(talloc_tos(),
 420                                             struct shadow_copy_data);
 421                 if (tevent_req_nomem(shadow_data, req)) {
 422                         DEBUG(0,("TALLOC_ZERO() failed!\n"));
 423                         return tevent_req_post(req, ev);
 424                 }
 425
 426                 /*
 427                  * Call the VFS routine to actually do the work.
 428                  */
 429                 if (SMB_VFS_GET_SHADOW_COPY_DATA(fsp, shadow_data, labels)
 430                     != 0) {
 431                         if (errno == ENOSYS) {
 432                                 DEBUG(5, ("FSCTL_GET_SHADOW_COPY_DATA: "
 433                                           "connectpath %s, not supported.\n",
 434                                           smbreq->conn->connectpath));
 435                                 status = NT_STATUS_NOT_SUPPORTED;
 436                         } else {
 437                                 DEBUG(0,("FSCTL_GET_SHADOW_COPY_DATA: "
 438                                          "connectpath %s, failed.\n",
 439                                          smbreq->conn->connectpath));
 440                                 status = map_nt_error_from_unix(errno);
 441                         }
 442                         TALLOC_FREE(shadow_data);
 443                         tevent_req_nterror(req, status);
 444                         return tevent_req_post(req, ev);
 445                 }
 446
 447                 labels_data_count =
 448                         (shadow_data->num_volumes*2*sizeof(SHADOW_COPY_LABEL))
 449                         + 2;
 450
 451                 if (labels) {
 452                         data_count = 12+labels_data_count+4;
 453                 } else {
 454                         data_count = 16;
 455                 }
 456
 457                 if (labels && (in_max_output < data_count)) {
 458                         DEBUG(0, ("FSCTL_GET_SHADOW_COPY_DATA: "
 459                                   "in_max_output(%u) too small (%u) bytes "
 460                                   "needed!\n", in_max_output, data_count));
 461                         TALLOC_FREE(shadow_data);
 462                         tevent_req_nterror(req, NT_STATUS_BUFFER_TOO_SMALL);
 463                         return tevent_req_post(req, ev);
 464                 }
 465
 466                 state->out_output = data_blob_talloc(state, NULL, data_count);
 467                 if (tevent_req_nomem(state->out_output.data, req)) {
 468                         return tevent_req_post(req, ev);
 469                 }
 470
 471                 pdata = (char *)state->out_output.data;
 472
 473                 /* num_volumes 4 bytes */
 474                 SIVAL(pdata, 0, shadow_data->num_volumes);
 475
 476                 if (labels) {
 477                         /* num_labels 4 bytes */
 478                         SIVAL(pdata, 4, shadow_data->num_volumes);
 479                 }
 480
 481                 /* needed_data_count 4 bytes */
 482                 SIVAL(pdata, 8, labels_data_count+4);
 483
 484                 pdata += 12;
 485
 486                 DEBUG(10,("FSCTL_GET_SHADOW_COPY_DATA: %u volumes for "
 487                           "path[%s].\n",
 488                           shadow_data->num_volumes, fsp_str_dbg(fsp)));
 489                 if (labels && shadow_data->labels) {
 490                         for (i=0; i<shadow_data->num_volumes; i++) {
 491                                 srvstr_push(pdata, smbreq->flags2,
 492                                             pdata, shadow_data->labels[i],
 493                                             2*sizeof(SHADOW_COPY_LABEL),
 494                                             STR_UNICODE|STR_TERMINATE);
 495                                 pdata += 2*sizeof(SHADOW_COPY_LABEL);
 496                                 DEBUGADD(10, ("Label[%u]: '%s'\n", i,
 497                                               shadow_data->labels[i]));
 498                         }
 499                 }
 500
 501                 TALLOC_FREE(shadow_data);
 502
 503                 tevent_req_done(req);
 504                 return tevent_req_post(req, ev);
 505         }
 506
 507         default:
 508                 if (IS_IPC(smbreq->conn)) {
 509                         tevent_req_nterror(req, NT_STATUS_FS_DRIVER_REQUIRED);
 510                         return tevent_req_post(req, ev);
 511                 }
 512                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 513                 return tevent_req_post(req, ev);
 514         }
 515
 516         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 517         return tevent_req_post(req, ev);
 518 }
 519
 520 static void smbd_smb2_ioctl_pipe_write_done(struct tevent_req *subreq)
 521 {
 522         struct tevent_req *req = tevent_req_callback_data(subreq,
 523                                  struct tevent_req);
 524         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 525                                               struct smbd_smb2_ioctl_state);
 526         NTSTATUS status;
 527         ssize_t nwritten = -1;
 528
 529         status = np_write_recv(subreq, &nwritten);
 530
 531         DEBUG(10,("smbd_smb2_ioctl_pipe_write_done: received %ld\n",
 532                 (long int)nwritten ));
 533
 534         TALLOC_FREE(subreq);
 535         if (!NT_STATUS_IS_OK(status)) {
 536                 tevent_req_nterror(req, status);
 537                 return;
 538         }
 539
 540         if (nwritten != state->in_input.length) {
 541                 tevent_req_nterror(req, NT_STATUS_PIPE_NOT_AVAILABLE);
 542                 return;
 543         }
 544
 545         state->out_output = data_blob_talloc(state, NULL, state->in_max_output);
 546         if (state->in_max_output > 0 &&
 547             tevent_req_nomem(state->out_output.data, req)) {
 548                 return;
 549         }
 550
 551         DEBUG(10,("smbd_smb2_ioctl_pipe_write_done: issuing np_read_send "
 552                 "of size %u\n",
 553                 (unsigned int)state->out_output.length ));
 554
 555         TALLOC_FREE(subreq);
 556         subreq = np_read_send(state->smbreq->conn,
 557                               state->smb2req->sconn->smb2.event_ctx,
 558                               state->fsp->fake_file_handle,
 559                               state->out_output.data,
 560                               state->out_output.length);
 561         if (tevent_req_nomem(subreq, req)) {
 562                 return;
 563         }
 564         tevent_req_set_callback(subreq, smbd_smb2_ioctl_pipe_read_done, req);
 565 }
 566
 567 static void smbd_smb2_ioctl_pipe_read_done(struct tevent_req *subreq)
 568 {
 569         struct tevent_req *req = tevent_req_callback_data(subreq,
 570                                  struct tevent_req);
 571         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 572                                               struct smbd_smb2_ioctl_state);
 573         NTSTATUS status;
 574         ssize_t nread = -1;
 575         bool is_data_outstanding = false;
 576
 577         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 578
 579         DEBUG(10,("smbd_smb2_ioctl_pipe_read_done: np_read_recv nread = %d "
 580                  "is_data_outstanding = %d, status = %s\n",
 581                 (int)nread,
 582                 (int)is_data_outstanding,
 583                 nt_errstr(status) ));
 584
 585         TALLOC_FREE(subreq);
 586         if (!NT_STATUS_IS_OK(status)) {
 587                 tevent_req_nterror(req, status);
 588                 return;
 589         }
 590
 591         state->out_output.length = nread;
 592
 593         if (is_data_outstanding) {
 594                 tevent_req_nterror(req, STATUS_BUFFER_OVERFLOW);
 595                 return;
 596         }
 597
 598         tevent_req_done(req);
 599 }
 600
 601 static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
 602                                      TALLOC_CTX *mem_ctx,
 603                                      DATA_BLOB *out_output)
 604 {
 605         NTSTATUS status = NT_STATUS_OK;
 606         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 607                                               struct smbd_smb2_ioctl_state);
 608
 609         if (tevent_req_is_nterror(req, &status)) {
 610                 if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
 611                         tevent_req_received(req);
 612                         return status;
 613                 }
 614         }
 615
 616         *out_output = state->out_output;
 617         talloc_steal(mem_ctx, out_output->data);
 618
 619         tevent_req_received(req);
 620         return status;
 621 }