source3/libsmb/clireadwrite.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client file read/write routines
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 /****************************************************************************
  23   Calculate the recommended read buffer size
  24 ****************************************************************************/
  25 static size_t cli_read_max_bufsize(struct cli_state *cli)
  26 {
  27         if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
  28             && (cli->posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
  29                 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
  30         }
  31         if (cli->capabilities & CAP_LARGE_READX) {
  32                 return cli->is_samba
  33                         ? CLI_SAMBA_MAX_LARGE_READX_SIZE
  34                         : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
  35         }
  36         return (cli->max_xmit - (smb_size+32)) & ~1023;
  37 }
  38
  39 /*
  40  * Send a read&x request
  41  */
  42
  43 struct async_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
  44                                      struct event_context *ev,
  45                                      struct cli_state *cli, int fnum,
  46                                      off_t offset, size_t size)
  47 {
  48         struct async_req *result;
  49         struct cli_request *req;
  50         bool bigoffset = False;
  51
  52         uint16_t vwv[12];
  53         uint8_t wct = 10;
  54
  55         if (size > cli_read_max_bufsize(cli)) {
  56                 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
  57                           "size=%d\n", (int)size,
  58                           (int)cli_read_max_bufsize(cli)));
  59                 return NULL;
  60         }
  61
  62         SCVAL(vwv + 0, 0, 0xFF);
  63         SCVAL(vwv + 0, 1, 0);
  64         SSVAL(vwv + 1, 0, 0);
  65         SSVAL(vwv + 2, 0, fnum);
  66         SIVAL(vwv + 3, 0, offset);
  67         SSVAL(vwv + 5, 0, size);
  68         SSVAL(vwv + 6, 0, size);
  69         SSVAL(vwv + 7, 0, (size >> 16));
  70         SSVAL(vwv + 8, 0, 0);
  71         SSVAL(vwv + 9, 0, 0);
  72
  73         if ((SMB_BIG_UINT)offset >> 32) {
  74                 bigoffset = True;
  75                 SIVAL(vwv + 10, 0,
  76                       (((SMB_BIG_UINT)offset)>>32) & 0xffffffff);
  77                 wct += 2;
  78         }
  79
  80         result = cli_request_send(mem_ctx, ev, cli, SMBreadX, 0, wct, vwv,
  81                                   0, NULL);
  82         if (result == NULL) {
  83                 return NULL;
  84         }
  85
  86         req = cli_request_get(result);
  87
  88         req->data.read.ofs = offset;
  89         req->data.read.size = size;
  90         req->data.read.received = 0;
  91         req->data.read.rcvbuf = NULL;
  92
  93         return result;
  94 }
  95
  96 /*
  97  * Pull the data out of a finished async read_and_x request. rcvbuf is
  98  * talloced from the request, so better make sure that you copy it away before
  99  * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
 100  * talloc_move it!
 101  */
 102
 103 NTSTATUS cli_read_andx_recv(struct async_req *req, ssize_t *received,
 104                             uint8_t **rcvbuf)
 105 {
 106         struct cli_request *cli_req = cli_request_get(req);
 107         NTSTATUS status;
 108         size_t size;
 109
 110         SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
 111         if (req->state == ASYNC_REQ_ERROR) {
 112                 return req->status;
 113         }
 114
 115         status = cli_pull_error(cli_req->inbuf);
 116
 117         if (NT_STATUS_IS_ERR(status)) {
 118                 return status;
 119         }
 120
 121         /* size is the number of bytes the server returned.
 122          * Might be zero. */
 123         size = SVAL(cli_req->inbuf, smb_vwv5);
 124         size |= (((unsigned int)(SVAL(cli_req->inbuf, smb_vwv7))) << 16);
 125
 126         if (size > cli_req->data.read.size) {
 127                 DEBUG(5,("server returned more than we wanted!\n"));
 128                 return NT_STATUS_UNEXPECTED_IO_ERROR;
 129         }
 130
 131         *rcvbuf = (uint8_t *)
 132                 (smb_base(cli_req->inbuf) + SVAL(cli_req->inbuf, smb_vwv6));
 133         *received = size;
 134         return NT_STATUS_OK;
 135 }
 136
 137 /*
 138  * Parallel read support.
 139  *
 140  * cli_pull sends as many read&x requests as the server would allow via
 141  * max_mux at a time. When replies flow back in, the data is written into
 142  * the callback function "sink" in the right order.
 143  */
 144
 145 struct cli_pull_state {
 146         struct async_req *req;
 147
 148         struct event_context *ev;
 149         struct cli_state *cli;
 150         uint16_t fnum;
 151         off_t start_offset;
 152         SMB_OFF_T size;
 153
 154         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 155         void *priv;
 156
 157         size_t chunk_size;
 158
 159         /*
 160          * Outstanding requests
 161          */
 162         int num_reqs;
 163         struct async_req **reqs;
 164
 165         /*
 166          * For how many bytes did we send requests already?
 167          */
 168         SMB_OFF_T requested;
 169
 170         /*
 171          * Next request index to push into "sink". This walks around the "req"
 172          * array, taking care that the requests are pushed to "sink" in the
 173          * right order. If necessary (i.e. replies don't come in in the right
 174          * order), replies are held back in "reqs".
 175          */
 176         int top_req;
 177
 178         /*
 179          * How many bytes did we push into "sink"?
 180          */
 181
 182         SMB_OFF_T pushed;
 183 };
 184
 185 static char *cli_pull_print(TALLOC_CTX *mem_ctx, struct async_req *req)
 186 {
 187         struct cli_pull_state *state = talloc_get_type_abort(
 188                 req->private_data, struct cli_pull_state);
 189         char *result;
 190
 191         result = async_req_print(mem_ctx, req);
 192         if (result == NULL) {
 193                 return NULL;
 194         }
 195
 196         return talloc_asprintf_append_buffer(
 197                 result, "num_reqs=%d, top_req=%d",
 198                 state->num_reqs, state->top_req);
 199 }
 200
 201 static void cli_pull_read_done(struct async_req *read_req);
 202
 203 /*
 204  * Prepare an async pull request
 205  */
 206
 207 struct async_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 208                                 struct event_context *ev,
 209                                 struct cli_state *cli,
 210                                 uint16_t fnum, off_t start_offset,
 211                                 SMB_OFF_T size, size_t window_size,
 212                                 NTSTATUS (*sink)(char *buf, size_t n,
 213                                                  void *priv),
 214                                 void *priv)
 215 {
 216         struct async_req *result;
 217         struct cli_pull_state *state;
 218         int i;
 219
 220         result = async_req_new(mem_ctx, ev);
 221         if (result == NULL) {
 222                 goto failed;
 223         }
 224         state = talloc(result, struct cli_pull_state);
 225         if (state == NULL) {
 226                 goto failed;
 227         }
 228         result->private_data = state;
 229         result->print = cli_pull_print;
 230         state->req = result;
 231
 232         state->cli = cli;
 233         state->ev = ev;
 234         state->fnum = fnum;
 235         state->start_offset = start_offset;
 236         state->size = size;
 237         state->sink = sink;
 238         state->priv = priv;
 239
 240         state->pushed = 0;
 241         state->top_req = 0;
 242
 243         if (size == 0) {
 244                 if (!async_post_status(result, NT_STATUS_OK)) {
 245                         goto failed;
 246                 }
 247                 return result;
 248         }
 249
 250         state->chunk_size = cli_read_max_bufsize(cli);
 251
 252         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 253         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 254
 255         state->reqs = TALLOC_ZERO_ARRAY(state, struct async_req *,
 256                                         state->num_reqs);
 257         if (state->reqs == NULL) {
 258                 goto failed;
 259         }
 260
 261         state->requested = 0;
 262
 263         for (i=0; i<state->num_reqs; i++) {
 264                 SMB_OFF_T size_left;
 265                 size_t request_thistime;
 266
 267                 if (state->requested >= size) {
 268                         state->num_reqs = i;
 269                         break;
 270                 }
 271
 272                 size_left = size - state->requested;
 273                 request_thistime = MIN(size_left, state->chunk_size);
 274
 275                 state->reqs[i] = cli_read_andx_send(
 276                         state->reqs, ev, cli, fnum,
 277                         state->start_offset + state->requested,
 278                         request_thistime);
 279
 280                 if (state->reqs[i] == NULL) {
 281                         goto failed;
 282                 }
 283
 284                 state->reqs[i]->async.fn = cli_pull_read_done;
 285                 state->reqs[i]->async.priv = result;
 286
 287                 state->requested += request_thistime;
 288         }
 289         return result;
 290
 291 failed:
 292         TALLOC_FREE(result);
 293         return NULL;
 294 }
 295
 296 /*
 297  * Handle incoming read replies, push the data into sink and send out new
 298  * requests if necessary.
 299  */
 300
 301 static void cli_pull_read_done(struct async_req *read_req)
 302 {
 303         struct async_req *pull_req = talloc_get_type_abort(
 304                 read_req->async.priv, struct async_req);
 305         struct cli_pull_state *state = talloc_get_type_abort(
 306                 pull_req->private_data, struct cli_pull_state);
 307         struct cli_request *read_state = cli_request_get(read_req);
 308         NTSTATUS status;
 309
 310         status = cli_read_andx_recv(read_req, &read_state->data.read.received,
 311                                     &read_state->data.read.rcvbuf);
 312         if (!NT_STATUS_IS_OK(status)) {
 313                 async_req_error(state->req, status);
 314                 return;
 315         }
 316
 317         /*
 318          * This loop is the one to take care of out-of-order replies. All
 319          * pending requests are in state->reqs, state->reqs[top_req] is the
 320          * one that is to be pushed next. If however a request later than
 321          * top_req is replied to, then we can't push yet. If top_req is
 322          * replied to at a later point then, we need to push all the finished
 323          * requests.
 324          */
 325
 326         while (state->reqs[state->top_req] != NULL) {
 327                 struct cli_request *top_read;
 328
 329                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 330                            state->top_req));
 331
 332                 if (state->reqs[state->top_req]->state < ASYNC_REQ_DONE) {
 333                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 334                                    "done\n"));
 335                         return;
 336                 }
 337
 338                 top_read = cli_request_get(state->reqs[state->top_req]);
 339
 340                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 341                            "pushed\n", (int)top_read->data.read.received,
 342                            (int)state->pushed));
 343
 344                 status = state->sink((char *)top_read->data.read.rcvbuf,
 345                                      top_read->data.read.received,
 346                                      state->priv);
 347                 if (!NT_STATUS_IS_OK(status)) {
 348                         async_req_error(state->req, status);
 349                         return;
 350                 }
 351                 state->pushed += top_read->data.read.received;
 352
 353                 TALLOC_FREE(state->reqs[state->top_req]);
 354
 355                 if (state->requested < state->size) {
 356                         struct async_req *new_req;
 357                         SMB_OFF_T size_left;
 358                         size_t request_thistime;
 359
 360                         size_left = state->size - state->requested;
 361                         request_thistime = MIN(size_left, state->chunk_size);
 362
 363                         DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
 364                                    "at %d, position %d\n",
 365                                    (int)request_thistime,
 366                                    (int)(state->start_offset
 367                                          + state->requested),
 368                                    state->top_req));
 369
 370                         new_req = cli_read_andx_send(
 371                                 state->reqs, state->ev, state->cli,
 372                                 state->fnum,
 373                                 state->start_offset + state->requested,
 374                                 request_thistime);
 375
 376                         if (async_req_nomem(new_req, state->req)) {
 377                                 return;
 378                         }
 379
 380                         new_req->async.fn = cli_pull_read_done;
 381                         new_req->async.priv = pull_req;
 382
 383                         state->reqs[state->top_req] = new_req;
 384                         state->requested += request_thistime;
 385                 }
 386
 387                 state->top_req = (state->top_req+1) % state->num_reqs;
 388         }
 389
 390         async_req_done(pull_req);
 391 }
 392
 393 NTSTATUS cli_pull_recv(struct async_req *req, SMB_OFF_T *received)
 394 {
 395         struct cli_pull_state *state = talloc_get_type_abort(
 396                 req->private_data, struct cli_pull_state);
 397
 398         SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
 399         if (req->state == ASYNC_REQ_ERROR) {
 400                 return req->status;
 401         }
 402         *received = state->pushed;
 403         return NT_STATUS_OK;
 404 }
 405
 406 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
 407                   off_t start_offset, SMB_OFF_T size, size_t window_size,
 408                   NTSTATUS (*sink)(char *buf, size_t n, void *priv),
 409                   void *priv, SMB_OFF_T *received)
 410 {
 411         TALLOC_CTX *frame = talloc_stackframe();
 412         struct event_context *ev;
 413         struct async_req *req;
 414         NTSTATUS result = NT_STATUS_NO_MEMORY;
 415
 416         if (cli->fd_event != NULL) {
 417                 /*
 418                  * Can't use sync call while an async call is in flight
 419                  */
 420                 return NT_STATUS_INVALID_PARAMETER;
 421         }
 422
 423         ev = event_context_init(frame);
 424         if (ev == NULL) {
 425                 goto nomem;
 426         }
 427
 428         req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
 429                             window_size, sink, priv);
 430         if (req == NULL) {
 431                 goto nomem;
 432         }
 433
 434         while (req->state < ASYNC_REQ_DONE) {
 435                 event_loop_once(ev);
 436         }
 437
 438         result = cli_pull_recv(req, received);
 439  nomem:
 440         TALLOC_FREE(frame);
 441         return result;
 442 }
 443
 444 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
 445 {
 446         char **pbuf = (char **)priv;
 447         memcpy(*pbuf, buf, n);
 448         *pbuf += n;
 449         return NT_STATUS_OK;
 450 }
 451
 452 ssize_t cli_read(struct cli_state *cli, int fnum, char *buf,
 453                  off_t offset, size_t size)
 454 {
 455         NTSTATUS status;
 456         SMB_OFF_T ret;
 457
 458         status = cli_pull(cli, fnum, offset, size, size,
 459                           cli_read_sink, &buf, &ret);
 460         if (!NT_STATUS_IS_OK(status)) {
 461                 cli_set_error(cli, status);
 462                 return -1;
 463         }
 464         return ret;
 465 }
 466
 467 /****************************************************************************
 468  Issue a single SMBwrite and don't wait for a reply.
 469 ****************************************************************************/
 470
 471 static bool cli_issue_write(struct cli_state *cli,
 472                                 int fnum,
 473                                 off_t offset,
 474                                 uint16 mode,
 475                                 const char *buf,
 476                                 size_t size,
 477                                 int i)
 478 {
 479         char *p;
 480         bool large_writex = false;
 481         /* We can only do direct writes if not signing and not encrypting. */
 482         bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
 483
 484         if (!direct_writes && size + 1 > cli->bufsize) {
 485                 cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
 486                 if (!cli->outbuf) {
 487                         return False;
 488                 }
 489                 cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
 490                 if (cli->inbuf == NULL) {
 491                         SAFE_FREE(cli->outbuf);
 492                         return False;
 493                 }
 494                 cli->bufsize = size + 1024;
 495         }
 496
 497         memset(cli->outbuf,'\0',smb_size);
 498         memset(cli->inbuf,'\0',smb_size);
 499
 500         if (cli->capabilities & CAP_LARGE_FILES) {
 501                 large_writex = True;
 502         }
 503
 504         if (large_writex) {
 505                 cli_set_message(cli->outbuf,14,0,True);
 506         } else {
 507                 cli_set_message(cli->outbuf,12,0,True);
 508         }
 509
 510         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 511         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 512         cli_setup_packet(cli);
 513
 514         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 515         SSVAL(cli->outbuf,smb_vwv2,fnum);
 516
 517         SIVAL(cli->outbuf,smb_vwv3,offset);
 518         SIVAL(cli->outbuf,smb_vwv5,0);
 519         SSVAL(cli->outbuf,smb_vwv7,mode);
 520
 521         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 522         /*
 523          * According to CIFS-TR-1p00, this following field should only
 524          * be set if CAP_LARGE_WRITEX is set. We should check this
 525          * locally. However, this check might already have been
 526          * done by our callers.
 527          */
 528         SSVAL(cli->outbuf,smb_vwv9,(size>>16));
 529         SSVAL(cli->outbuf,smb_vwv10,size);
 530         /* +1 is pad byte. */
 531         SSVAL(cli->outbuf,smb_vwv11,
 532               smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
 533
 534         if (large_writex) {
 535                 SIVAL(cli->outbuf,smb_vwv12,(((SMB_BIG_UINT)offset)>>32) & 0xffffffff);
 536         }
 537
 538         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
 539         *p++ = '\0'; /* pad byte. */
 540         if (!direct_writes) {
 541                 memcpy(p, buf, size);
 542         }
 543         if (size > 0x1FFFF) {
 544                 /* This is a POSIX 14 word large write. */
 545                 set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
 546                 _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
 547         } else {
 548                 cli_setup_bcc(cli, p+size);
 549         }
 550
 551         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 552
 553         show_msg(cli->outbuf);
 554         if (direct_writes) {
 555                 /* For direct writes we now need to write the data
 556                  * directly out of buf. */
 557                 return cli_send_smb_direct_writeX(cli, buf, size);
 558         } else {
 559                 return cli_send_smb(cli);
 560         }
 561 }
 562
 563 /****************************************************************************
 564   write to a file
 565   write_mode: 0x0001 disallow write cacheing
 566               0x0002 return bytes remaining
 567               0x0004 use raw named pipe protocol
 568               0x0008 start of message mode named pipe protocol
 569 ****************************************************************************/
 570
 571 ssize_t cli_write(struct cli_state *cli,
 572                  int fnum, uint16 write_mode,
 573                  const char *buf, off_t offset, size_t size)
 574 {
 575         ssize_t bwritten = 0;
 576         unsigned int issued = 0;
 577         unsigned int received = 0;
 578         int mpx = 1;
 579         size_t writesize;
 580         int blocks;
 581
 582         if(cli->max_mux > 1) {
 583                 mpx = cli->max_mux-1;
 584         } else {
 585                 mpx = 1;
 586         }
 587
 588         /* Default (small) writesize. */
 589         writesize = (cli->max_xmit - (smb_size+32)) & ~1023;
 590
 591         if (write_mode == 0 &&
 592                         !client_is_signing_on(cli) &&
 593                         !cli_encryption_on(cli) &&
 594                         (cli->posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
 595                         (cli->capabilities & CAP_LARGE_FILES)) {
 596                 /* Only do massive writes if we can do them direct
 597                  * with no signing or encrypting - not on a pipe. */
 598                 writesize = CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
 599         } else if ((cli->capabilities & CAP_LARGE_WRITEX) &&
 600                         (strcmp(cli->dev, "LPT1:") != 0)) {
 601
 602                 /* Printer devices are restricted to max_xmit
 603                  * writesize in Vista and XPSP3. */
 604
 605                 if (cli->is_samba) {
 606                         writesize = CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
 607                 } else if (!client_is_signing_on(cli)) {
 608                         /* Windows restricts signed writes to max_xmit.
 609                          * Found by Volker. */
 610                         writesize = CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
 611                 }
 612         }
 613
 614         blocks = (size + (writesize-1)) / writesize;
 615
 616         while (received < blocks) {
 617
 618                 while ((issued - received < mpx) && (issued < blocks)) {
 619                         ssize_t bsent = issued * writesize;
 620                         ssize_t size1 = MIN(writesize, size - bsent);
 621
 622                         if (!cli_issue_write(cli, fnum, offset + bsent,
 623                                         write_mode,
 624                                         buf + bsent,
 625                                         size1, issued))
 626                                 return -1;
 627                         issued++;
 628                 }
 629
 630                 if (!cli_receive_smb(cli)) {
 631                         return bwritten;
 632                 }
 633
 634                 received++;
 635
 636                 if (cli_is_error(cli))
 637                         break;
 638
 639                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 640                 if (writesize > 0xFFFF) {
 641                         bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
 642                 }
 643         }
 644
 645         while (received < issued && cli_receive_smb(cli)) {
 646                 received++;
 647         }
 648
 649         return bwritten;
 650 }
 651
 652 /****************************************************************************
 653   write to a file using a SMBwrite and not bypassing 0 byte writes
 654 ****************************************************************************/
 655
 656 ssize_t cli_smbwrite(struct cli_state *cli,
 657                      int fnum, char *buf, off_t offset, size_t size1)
 658 {
 659         char *p;
 660         ssize_t total = 0;
 661
 662         do {
 663                 size_t size = MIN(size1, cli->max_xmit - 48);
 664
 665                 memset(cli->outbuf,'\0',smb_size);
 666                 memset(cli->inbuf,'\0',smb_size);
 667
 668                 cli_set_message(cli->outbuf,5, 0,True);
 669
 670                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 671                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 672                 cli_setup_packet(cli);
 673
 674                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 675                 SSVAL(cli->outbuf,smb_vwv1,size);
 676                 SIVAL(cli->outbuf,smb_vwv2,offset);
 677                 SSVAL(cli->outbuf,smb_vwv4,0);
 678
 679                 p = smb_buf(cli->outbuf);
 680                 *p++ = 1;
 681                 SSVAL(p, 0, size); p += 2;
 682                 memcpy(p, buf + total, size); p += size;
 683
 684                 cli_setup_bcc(cli, p);
 685
 686                 if (!cli_send_smb(cli))
 687                         return -1;
 688
 689                 if (!cli_receive_smb(cli))
 690                         return -1;
 691
 692                 if (cli_is_error(cli))
 693                         return -1;
 694
 695                 size = SVAL(cli->inbuf,smb_vwv0);
 696                 if (size == 0)
 697                         break;
 698
 699                 size1 -= size;
 700                 total += size;
 701                 offset += size;
 702
 703         } while (size1);
 704
 705         return total;
 706 }