source3/smbd/smb2_read.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 "system/filesys.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "libcli/security/security.h"
  27 #include "../lib/util/tevent_ntstatus.h"
  28 #include "rpc_server/srv_pipe_hnd.h"
  29 #include "lib/util/sys_rw_data.h"
  30
  31 #undef DBGC_CLASS
  32 #define DBGC_CLASS DBGC_SMB2
  33
  34 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
  35                                               struct tevent_context *ev,
  36                                               struct smbd_smb2_request *smb2req,
  37                                               struct files_struct *in_fsp,
  38                                               uint8_t in_flags,
  39                                               uint32_t in_length,
  40                                               uint64_t in_offset,
  41                                               uint32_t in_minimum,
  42                                               uint32_t in_remaining);
  43 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
  44                                     TALLOC_CTX *mem_ctx,
  45                                     DATA_BLOB *out_data,
  46                                     uint32_t *out_remaining);
  47
  48 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
  49 NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
  50 {
  51         struct smbXsrv_connection *xconn = req->xconn;
  52         NTSTATUS status;
  53         const uint8_t *inbody;
  54         uint8_t in_flags;
  55         uint32_t in_length;
  56         uint64_t in_offset;
  57         uint64_t in_file_id_persistent;
  58         uint64_t in_file_id_volatile;
  59         struct files_struct *in_fsp;
  60         uint32_t in_minimum_count;
  61         uint32_t in_remaining_bytes;
  62         struct tevent_req *subreq;
  63
  64         status = smbd_smb2_request_verify_sizes(req, 0x31);
  65         if (!NT_STATUS_IS_OK(status)) {
  66                 return smbd_smb2_request_error(req, status);
  67         }
  68         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  69
  70         if (xconn->protocol >= PROTOCOL_SMB3_02) {
  71                 in_flags                = CVAL(inbody, 0x03);
  72         } else {
  73                 in_flags                = 0;
  74         }
  75         in_length               = IVAL(inbody, 0x04);
  76         in_offset               = BVAL(inbody, 0x08);
  77         in_file_id_persistent   = BVAL(inbody, 0x10);
  78         in_file_id_volatile     = BVAL(inbody, 0x18);
  79         in_minimum_count        = IVAL(inbody, 0x20);
  80         in_remaining_bytes      = IVAL(inbody, 0x28);
  81
  82         /* check the max read size */
  83         if (in_length > xconn->smb2.server.max_read) {
  84                 DEBUG(2,("smbd_smb2_request_process_read: "
  85                          "client ignored max read: %s: 0x%08X: 0x%08X\n",
  86                         __location__, in_length, xconn->smb2.server.max_read));
  87                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  88         }
  89
  90         status = smbd_smb2_request_verify_creditcharge(req, in_length);
  91         if (!NT_STATUS_IS_OK(status)) {
  92                 return smbd_smb2_request_error(req, status);
  93         }
  94
  95         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  96         if (in_fsp == NULL) {
  97                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  98         }
  99
 100         subreq = smbd_smb2_read_send(req, req->sconn->ev_ctx,
 101                                      req, in_fsp,
 102                                      in_flags,
 103                                      in_length,
 104                                      in_offset,
 105                                      in_minimum_count,
 106                                      in_remaining_bytes);
 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_read_done, req);
 111
 112         return smbd_smb2_request_pending_queue(req, subreq, 500);
 113 }
 114
 115 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 116 {
 117         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 118                                         struct smbd_smb2_request);
 119         uint16_t body_size;
 120         uint8_t body_padding = req->xconn->smb2.smbtorture.read_body_padding;
 121         DATA_BLOB outbody;
 122         DATA_BLOB outdyn;
 123         uint8_t out_data_offset;
 124         DATA_BLOB out_data_buffer = data_blob_null;
 125         uint32_t out_data_remaining = 0;
 126         NTSTATUS status;
 127         NTSTATUS error; /* transport error */
 128
 129         status = smbd_smb2_read_recv(subreq,
 130                                      req,
 131                                      &out_data_buffer,
 132                                      &out_data_remaining);
 133         TALLOC_FREE(subreq);
 134         if (!NT_STATUS_IS_OK(status)) {
 135                 error = smbd_smb2_request_error(req, status);
 136                 if (!NT_STATUS_IS_OK(error)) {
 137                         smbd_server_connection_terminate(req->xconn,
 138                                                          nt_errstr(error));
 139                         return;
 140                 }
 141                 return;
 142         }
 143
 144         /*
 145          * Only FSCTL_SMBTORTURE_GLOBAL_READ_RESPONSE_BODY_PADDING8
 146          * sets body_padding to a value different from 0.
 147          */
 148         body_size = 0x10 + body_padding;
 149         out_data_offset = SMB2_HDR_BODY + body_size;
 150
 151         outbody = smbd_smb2_generate_outbody(req, body_size);
 152         if (outbody.data == NULL) {
 153                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 154                 if (!NT_STATUS_IS_OK(error)) {
 155                         smbd_server_connection_terminate(req->xconn,
 156                                                          nt_errstr(error));
 157                         return;
 158                 }
 159                 return;
 160         }
 161
 162         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 163         SCVAL(outbody.data, 0x02,
 164               out_data_offset);                 /* data offset */
 165         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 166         SIVAL(outbody.data, 0x04,
 167               out_data_buffer.length);          /* data length */
 168         SIVAL(outbody.data, 0x08,
 169               out_data_remaining);              /* data remaining */
 170         SIVAL(outbody.data, 0x0C, 0);           /* reserved */
 171         if (body_padding != 0) {
 172                 memset(outbody.data + 0x10, 0, body_padding);
 173         }
 174
 175         outdyn = out_data_buffer;
 176
 177         error = smbd_smb2_request_done(req, outbody, &outdyn);
 178         if (!NT_STATUS_IS_OK(error)) {
 179                 smbd_server_connection_terminate(req->xconn,
 180                                                  nt_errstr(error));
 181                 return;
 182         }
 183 }
 184
 185 struct smbd_smb2_read_state {
 186         struct smbd_smb2_request *smb2req;
 187         struct smb_request *smbreq;
 188         files_struct *fsp;
 189         uint8_t in_flags;
 190         uint32_t in_length;
 191         uint64_t in_offset;
 192         uint32_t in_minimum;
 193         DATA_BLOB out_headers;
 194         uint8_t _out_hdr_buf[NBT_HDR_SIZE + SMB2_HDR_BODY + 0x10];
 195         DATA_BLOB out_data;
 196         uint32_t out_remaining;
 197 };
 198
 199 static int smb2_smb2_read_state_deny_destructor(struct smbd_smb2_read_state *state)
 200 {
 201         return -1;
 202 }
 203
 204 /* struct smbd_smb2_read_state destructor. Send the SMB2_READ data. */
 205 static int smb2_sendfile_send_data(struct smbd_smb2_read_state *state)
 206 {
 207         uint32_t in_length = state->in_length;
 208         uint64_t in_offset = state->in_offset;
 209         files_struct *fsp = state->fsp;
 210         const DATA_BLOB *hdr = state->smb2req->queue_entry.sendfile_header;
 211         NTSTATUS *pstatus = state->smb2req->queue_entry.sendfile_status;
 212         struct smbXsrv_connection *xconn = state->smb2req->xconn;
 213         ssize_t nread;
 214         ssize_t ret;
 215         int saved_errno;
 216
 217         nread = SMB_VFS_SENDFILE(xconn->transport.sock,
 218                                  fsp,
 219                                  hdr,
 220                                  in_offset,
 221                                  in_length);
 222         DBG_DEBUG("SMB_VFS_SENDFILE returned %zd on file %s\n",
 223                   nread,
 224                   fsp_str_dbg(fsp));
 225
 226         if (nread == -1) {
 227                 saved_errno = errno;
 228
 229                 /*
 230                  * Returning ENOSYS means no data at all was sent.
 231                    Do this as a normal read. */
 232                 if (errno == ENOSYS) {
 233                         goto normal_read;
 234                 }
 235
 236                 if (errno == ENOTSUP) {
 237                         set_use_sendfile(SNUM(fsp->conn), false);
 238                         DBG_WARNING("Disabling sendfile use as sendfile is "
 239                                     "not supported by the system\n");
 240                         goto normal_read;
 241                 }
 242
 243                 if (errno == EINTR) {
 244                         /*
 245                          * Special hack for broken Linux with no working sendfile. If we
 246                          * return EINTR we sent the header but not the rest of the data.
 247                          * Fake this up by doing read/write calls.
 248                          */
 249                         set_use_sendfile(SNUM(fsp->conn), false);
 250                         nread = fake_sendfile(xconn, fsp, in_offset, in_length);
 251                         if (nread == -1) {
 252                                 saved_errno = errno;
 253                                 DBG_ERR("fake_sendfile failed for file %s "
 254                                         "(%s) for client %s. Terminating\n",
 255                                         fsp_str_dbg(fsp),
 256                                         strerror(saved_errno),
 257                                         smbXsrv_connection_dbg(xconn));
 258                                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 259                                 return 0;
 260                         }
 261                         goto out;
 262                 }
 263
 264                 DBG_ERR("sendfile failed for file "
 265                         "%s (%s) for client %s. Terminating\n",
 266                         fsp_str_dbg(fsp),
 267                         strerror(saved_errno),
 268                         smbXsrv_connection_dbg(xconn));
 269                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 270                 return 0;
 271         } else if (nread == 0) {
 272                 /*
 273                  * Some sendfile implementations return 0 to indicate
 274                  * that there was a short read, but nothing was
 275                  * actually written to the socket.  In this case,
 276                  * fallback to the normal read path so the header gets
 277                  * the correct byte count.
 278                  */
 279                 DBG_NOTICE("sendfile sent zero bytes "
 280                            "falling back to the normal read: %s\n",
 281                            fsp_str_dbg(fsp));
 282                 goto normal_read;
 283         }
 284
 285         /*
 286          * We got a short read
 287          */
 288         goto out;
 289
 290 normal_read:
 291         /* Send out the header. */
 292         ret = write_data(xconn->transport.sock,
 293                          (const char *)hdr->data, hdr->length);
 294         if (ret != hdr->length) {
 295                 saved_errno = errno;
 296                 DBG_ERR("write_data failed for file "
 297                         "%s (%s) for client %s. Terminating\n",
 298                         fsp_str_dbg(fsp),
 299                         strerror(saved_errno),
 300                         smbXsrv_connection_dbg(xconn));
 301                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 302                 return 0;
 303         }
 304         nread = fake_sendfile(xconn, fsp, in_offset, in_length);
 305         if (nread == -1) {
 306                 saved_errno = errno;
 307                 DBG_ERR("fake_sendfile failed for file %s (%s) for client %s. "
 308                         "Terminating\n",
 309                         fsp_str_dbg(fsp),
 310                         strerror(saved_errno),
 311                         smbXsrv_connection_dbg(xconn));
 312                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 313                 return 0;
 314         }
 315
 316   out:
 317
 318         if (nread < in_length) {
 319                 ret = sendfile_short_send(xconn, fsp, nread,
 320                                           hdr->length, in_length);
 321                 if (ret == -1) {
 322                         saved_errno = errno;
 323                         DBG_ERR("sendfile_short_send "
 324                                 "failed for file %s (%s) for client %s. "
 325                                 "Terminating\n",
 326                                 fsp_str_dbg(fsp),
 327                                 strerror(saved_errno),
 328                                 smbXsrv_connection_dbg(xconn));
 329                         *pstatus = map_nt_error_from_unix_common(saved_errno);
 330                         return 0;
 331                 }
 332         }
 333
 334         *pstatus = NT_STATUS_OK;
 335         return 0;
 336 }
 337
 338 static NTSTATUS schedule_smb2_sendfile_read(struct smbd_smb2_request *smb2req,
 339                                         struct smbd_smb2_read_state *state)
 340 {
 341         files_struct *fsp = state->fsp;
 342
 343         /*
 344          * We cannot use sendfile if...
 345          * We were not configured to do so OR
 346          * Signing is active OR
 347          * This is a compound SMB2 operation OR
 348          * fsp is a STREAM file OR
 349          * It's not a regular file OR
 350          * Requested offset is greater than file size OR
 351          * there's not enough data in the file.
 352          * Phew :-). Luckily this means most
 353          * reads on most normal files. JRA.
 354         */
 355
 356         if (!lp__use_sendfile(SNUM(fsp->conn)) ||
 357             smb2req->do_signing ||
 358             smb2req->do_encryption ||
 359             smbd_smb2_is_compound(smb2req) ||
 360             fsp_is_alternate_stream(fsp) ||
 361             (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) ||
 362             (state->in_offset >= fsp->fsp_name->st.st_ex_size) ||
 363             (fsp->fsp_name->st.st_ex_size < state->in_offset + state->in_length))
 364         {
 365                 return NT_STATUS_RETRY;
 366         }
 367
 368         /* We've already checked there's this amount of data
 369            to read. */
 370         state->out_data.length = state->in_length;
 371         state->out_remaining = 0;
 372
 373         state->out_headers = data_blob_const(state->_out_hdr_buf,
 374                                              sizeof(state->_out_hdr_buf));
 375         return NT_STATUS_OK;
 376 }
 377
 378 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
 379
 380 /*******************************************************************
 381  Common read complete processing function for both synchronous and
 382  asynchronous reads.
 383 *******************************************************************/
 384
 385 NTSTATUS smb2_read_complete(struct tevent_req *req, ssize_t nread, int err)
 386 {
 387         struct smbd_smb2_read_state *state = tevent_req_data(req,
 388                                         struct smbd_smb2_read_state);
 389         files_struct *fsp = state->fsp;
 390
 391         if (nread < 0) {
 392                 NTSTATUS status = map_nt_error_from_unix(err);
 393
 394                 DEBUG( 3,( "smb2_read_complete: file %s nread = %d. "
 395                         "Error = %s (NTSTATUS %s)\n",
 396                         fsp_str_dbg(fsp),
 397                         (int)nread,
 398                         strerror(err),
 399                         nt_errstr(status)));
 400
 401                 return status;
 402         }
 403         if (nread == 0 && state->in_length != 0) {
 404                 DEBUG(5,("smb2_read_complete: read_file[%s] end of file\n",
 405                         fsp_str_dbg(fsp)));
 406                 return NT_STATUS_END_OF_FILE;
 407         }
 408
 409         if (nread < state->in_minimum) {
 410                 DEBUG(5,("smb2_read_complete: read_file[%s] read less %d than "
 411                         "minimum requested %u. Returning end of file\n",
 412                         fsp_str_dbg(fsp),
 413                         (int)nread,
 414                         (unsigned int)state->in_minimum));
 415                 return NT_STATUS_END_OF_FILE;
 416         }
 417
 418         DEBUG(3,("smbd_smb2_read: %s, file %s, length=%lu offset=%lu read=%lu\n",
 419                 fsp_fnum_dbg(fsp),
 420                 fsp_str_dbg(fsp),
 421                 (unsigned long)state->in_length,
 422                 (unsigned long)state->in_offset,
 423                 (unsigned long)nread));
 424
 425         state->out_data.length = nread;
 426         state->out_remaining = 0;
 427
 428         return NT_STATUS_OK;
 429 }
 430
 431 static bool smbd_smb2_read_cancel(struct tevent_req *req)
 432 {
 433         struct smbd_smb2_read_state *state =
 434                 tevent_req_data(req,
 435                 struct smbd_smb2_read_state);
 436
 437         return cancel_smb2_aio(state->smbreq);
 438 }
 439
 440 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
 441                                               struct tevent_context *ev,
 442                                               struct smbd_smb2_request *smb2req,
 443                                               struct files_struct *fsp,
 444                                               uint8_t in_flags,
 445                                               uint32_t in_length,
 446                                               uint64_t in_offset,
 447                                               uint32_t in_minimum,
 448                                               uint32_t in_remaining)
 449 {
 450         NTSTATUS status;
 451         struct tevent_req *req = NULL;
 452         struct smbd_smb2_read_state *state = NULL;
 453         struct smb_request *smbreq = NULL;
 454         connection_struct *conn = smb2req->tcon->compat;
 455         ssize_t nread = -1;
 456         struct lock_struct lock;
 457         int saved_errno;
 458
 459         req = tevent_req_create(mem_ctx, &state,
 460                                 struct smbd_smb2_read_state);
 461         if (req == NULL) {
 462                 return NULL;
 463         }
 464         state->smb2req = smb2req;
 465         state->in_flags = in_flags;
 466         state->in_length = in_length;
 467         state->in_offset = in_offset;
 468         state->in_minimum = in_minimum;
 469         state->out_data = data_blob_null;
 470         state->out_remaining = 0;
 471
 472         DEBUG(10,("smbd_smb2_read: %s - %s\n",
 473                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 474
 475         smbreq = smbd_smb2_fake_smb_request(smb2req, fsp);
 476         if (tevent_req_nomem(smbreq, req)) {
 477                 return tevent_req_post(req, ev);
 478         }
 479         state->smbreq = smbreq;
 480
 481         if (fsp->fsp_flags.is_directory) {
 482                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 483                 return tevent_req_post(req, ev);
 484         }
 485
 486         state->fsp = fsp;
 487
 488         if (IS_IPC(smbreq->conn)) {
 489                 struct tevent_req *subreq = NULL;
 490                 bool ok;
 491
 492                 state->out_data = data_blob_talloc(state, NULL, in_length);
 493                 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 494                         return tevent_req_post(req, ev);
 495                 }
 496
 497                 if (!fsp_is_np(fsp)) {
 498                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 499                         return tevent_req_post(req, ev);
 500                 }
 501
 502                 subreq = np_read_send(state, ev,
 503                                       fsp->fake_file_handle,
 504                                       state->out_data.data,
 505                                       state->out_data.length);
 506                 if (tevent_req_nomem(subreq, req)) {
 507                         return tevent_req_post(req, ev);
 508                 }
 509                 tevent_req_set_callback(subreq,
 510                                         smbd_smb2_read_pipe_done,
 511                                         req);
 512
 513                 /*
 514                  * Make sure we mark the fsp as having outstanding async
 515                  * activity so we don't crash on shutdown close.
 516                  */
 517
 518                 ok = aio_add_req_to_fsp(fsp, req);
 519                 if (!ok) {
 520                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 521                         return tevent_req_post(req, ev);
 522                 }
 523
 524                 return req;
 525         }
 526
 527         if (!CHECK_READ_SMB2(fsp)) {
 528                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 529                 return tevent_req_post(req, ev);
 530         }
 531
 532         status = schedule_smb2_aio_read(fsp->conn,
 533                                 smbreq,
 534                                 fsp,
 535                                 state,
 536                                 &state->out_data,
 537                                 (off_t)in_offset,
 538                                 (size_t)in_length);
 539
 540         if (NT_STATUS_IS_OK(status)) {
 541                 /*
 542                  * Doing an async read, allow this
 543                  * request to be canceled
 544                  */
 545                 tevent_req_set_cancel_fn(req, smbd_smb2_read_cancel);
 546                 return req;
 547         }
 548
 549         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 550                 /* Real error in setting up aio. Fail. */
 551                 tevent_req_nterror(req, status);
 552                 return tevent_req_post(req, ev);
 553         }
 554
 555         /* Fallback to synchronous. */
 556
 557         init_strict_lock_struct(fsp,
 558                                 fsp->op->global->open_persistent_id,
 559                                 in_offset,
 560                                 in_length,
 561                                 READ_LOCK,
 562                                 lp_posix_cifsu_locktype(fsp),
 563                                 &lock);
 564
 565         if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &lock)) {
 566                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 567                 return tevent_req_post(req, ev);
 568         }
 569
 570         /* Try sendfile in preference. */
 571         status = schedule_smb2_sendfile_read(smb2req, state);
 572         if (NT_STATUS_IS_OK(status)) {
 573                 tevent_req_done(req);
 574                 return tevent_req_post(req, ev);
 575         }
 576         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 577                 tevent_req_nterror(req, status);
 578                 return tevent_req_post(req, ev);
 579         }
 580
 581         /* Ok, read into memory. Allocate the out buffer. */
 582         state->out_data = data_blob_talloc(state, NULL, in_length);
 583         if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 584                 return tevent_req_post(req, ev);
 585         }
 586
 587         nread = read_file(fsp,
 588                           (char *)state->out_data.data,
 589                           in_offset,
 590                           in_length);
 591
 592         saved_errno = errno;
 593
 594         DEBUG(10,("smbd_smb2_read: file %s, %s, offset=%llu "
 595                 "len=%llu returned %lld\n",
 596                 fsp_str_dbg(fsp),
 597                 fsp_fnum_dbg(fsp),
 598                 (unsigned long long)in_offset,
 599                 (unsigned long long)in_length,
 600                 (long long)nread));
 601
 602         status = smb2_read_complete(req, nread, saved_errno);
 603         if (!NT_STATUS_IS_OK(status)) {
 604                 tevent_req_nterror(req, status);
 605         } else {
 606                 /* Success. */
 607                 tevent_req_done(req);
 608         }
 609         return tevent_req_post(req, ev);
 610 }
 611
 612 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
 613 {
 614         struct tevent_req *req = tevent_req_callback_data(subreq,
 615                                  struct tevent_req);
 616         struct smbd_smb2_read_state *state = tevent_req_data(req,
 617                                              struct smbd_smb2_read_state);
 618         NTSTATUS status;
 619         ssize_t nread = -1;
 620         bool is_data_outstanding;
 621
 622         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 623         TALLOC_FREE(subreq);
 624         if (!NT_STATUS_IS_OK(status)) {
 625                 NTSTATUS old = status;
 626                 status = nt_status_np_pipe(old);
 627                 tevent_req_nterror(req, status);
 628                 return;
 629         }
 630
 631         if (nread == 0 && state->out_data.length != 0) {
 632                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 633                 return;
 634         }
 635
 636         state->out_data.length = nread;
 637         state->out_remaining = 0;
 638
 639         /*
 640          * TODO: add STATUS_BUFFER_OVERFLOW handling, once we also
 641          * handle it in SMB1 pipe_read_andx_done().
 642          */
 643
 644         tevent_req_done(req);
 645 }
 646
 647 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
 648                                     TALLOC_CTX *mem_ctx,
 649                                     DATA_BLOB *out_data,
 650                                     uint32_t *out_remaining)
 651 {
 652         NTSTATUS status;
 653         struct smbd_smb2_read_state *state = tevent_req_data(req,
 654                                              struct smbd_smb2_read_state);
 655
 656         if (tevent_req_is_nterror(req, &status)) {
 657                 tevent_req_received(req);
 658                 return status;
 659         }
 660
 661         *out_data = state->out_data;
 662         talloc_steal(mem_ctx, out_data->data);
 663         *out_remaining = state->out_remaining;
 664
 665         if (state->out_headers.length > 0) {
 666                 talloc_steal(mem_ctx, state);
 667                 talloc_set_destructor(state, smb2_smb2_read_state_deny_destructor);
 668                 tevent_req_received(req);
 669                 state->smb2req->queue_entry.sendfile_header = &state->out_headers;
 670                 state->smb2req->queue_entry.sendfile_body_size = state->in_length;
 671                 talloc_set_destructor(state, smb2_sendfile_send_data);
 672         } else {
 673                 tevent_req_received(req);
 674         }
 675
 676         return NT_STATUS_OK;
 677 }