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   Calculate the recommended write buffer size
  41 ****************************************************************************/
  42 static size_t cli_write_max_bufsize(struct cli_state *cli, uint16_t write_mode)
  43 {
  44         if (write_mode == 0 &&
  45             !client_is_signing_on(cli) &&
  46             !cli_encryption_on(cli) &&
  47             (cli->posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
  48             (cli->capabilities & CAP_LARGE_FILES)) {
  49                 /* Only do massive writes if we can do them direct
  50                  * with no signing or encrypting - not on a pipe. */
  51                 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
  52         }
  53
  54         if (cli->is_samba) {
  55                 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
  56         }
  57
  58         if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
  59             || client_is_signing_on(cli)
  60             || strequal(cli->dev, "LPT1:")) {
  61
  62                 /*
  63                  * Printer devices are restricted to max_xmit writesize in
  64                  * Vista and XPSP3 as are signing connections.
  65                  */
  66
  67                 return (cli->max_xmit - (smb_size+32)) & ~1023;
  68         }
  69
  70         return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
  71 }
  72
  73 struct cli_read_andx_state {
  74         size_t size;
  75         uint16_t vwv[12];
  76         NTSTATUS status;
  77         size_t received;
  78         uint8_t *buf;
  79 };
  80
  81 static void cli_read_andx_done(struct tevent_req *subreq);
  82
  83 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
  84                                         struct event_context *ev,
  85                                         struct cli_state *cli, uint16_t fnum,
  86                                         off_t offset, size_t size,
  87                                         struct tevent_req **psmbreq)
  88 {
  89         struct tevent_req *req, *subreq;
  90         struct cli_read_andx_state *state;
  91         bool bigoffset = False;
  92         uint8_t wct = 10;
  93
  94         if (size > cli_read_max_bufsize(cli)) {
  95                 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
  96                           "size=%d\n", (int)size,
  97                           (int)cli_read_max_bufsize(cli)));
  98                 return NULL;
  99         }
 100
 101         req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
 102         if (req == NULL) {
 103                 return NULL;
 104         }
 105         state->size = size;
 106
 107         SCVAL(state->vwv + 0, 0, 0xFF);
 108         SCVAL(state->vwv + 0, 1, 0);
 109         SSVAL(state->vwv + 1, 0, 0);
 110         SSVAL(state->vwv + 2, 0, fnum);
 111         SIVAL(state->vwv + 3, 0, offset);
 112         SSVAL(state->vwv + 5, 0, size);
 113         SSVAL(state->vwv + 6, 0, size);
 114         SSVAL(state->vwv + 7, 0, (size >> 16));
 115         SSVAL(state->vwv + 8, 0, 0);
 116         SSVAL(state->vwv + 9, 0, 0);
 117
 118         if ((uint64_t)offset >> 32) {
 119                 bigoffset = true;
 120                 SIVAL(state->vwv + 10, 0,
 121                       (((uint64_t)offset)>>32) & 0xffffffff);
 122                 wct += 2;
 123         }
 124
 125         subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
 126                                     state->vwv, 0, NULL);
 127         if (subreq == NULL) {
 128                 TALLOC_FREE(req);
 129                 return NULL;
 130         }
 131         tevent_req_set_callback(subreq, cli_read_andx_done, req);
 132         *psmbreq = subreq;
 133         return req;
 134 }
 135
 136 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
 137                                       struct event_context *ev,
 138                                       struct cli_state *cli, uint16_t fnum,
 139                                       off_t offset, size_t size)
 140 {
 141         struct tevent_req *req, *subreq;
 142         NTSTATUS status;
 143
 144         req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
 145                                    &subreq);
 146         if (req == NULL) {
 147                 return NULL;
 148         }
 149
 150         status = cli_smb_req_send(subreq);
 151         if (!NT_STATUS_IS_OK(status)) {
 152                 tevent_req_nterror(req, status);
 153                 return tevent_req_post(req, ev);
 154         }
 155         return req;
 156 }
 157
 158 static void cli_read_andx_done(struct tevent_req *subreq)
 159 {
 160         struct tevent_req *req = tevent_req_callback_data(
 161                 subreq, struct tevent_req);
 162         struct cli_read_andx_state *state = tevent_req_data(
 163                 req, struct cli_read_andx_state);
 164         uint8_t *inbuf;
 165         uint8_t wct;
 166         uint16_t *vwv;
 167         uint32_t num_bytes;
 168         uint8_t *bytes;
 169
 170         state->status = cli_smb_recv(subreq, 12, &wct, &vwv, &num_bytes,
 171                                      &bytes);
 172         if (NT_STATUS_IS_ERR(state->status)) {
 173                 tevent_req_nterror(req, state->status);
 174                 return;
 175         }
 176
 177         /* size is the number of bytes the server returned.
 178          * Might be zero. */
 179         state->received = SVAL(vwv + 5, 0);
 180         state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
 181
 182         if (state->received > state->size) {
 183                 DEBUG(5,("server returned more than we wanted!\n"));
 184                 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
 185                 return;
 186         }
 187
 188         /*
 189          * bcc field must be valid for small reads, for large reads the 16-bit
 190          * bcc field can't be correct.
 191          */
 192
 193         if ((state->received < 0xffff) && (state->received > num_bytes)) {
 194                 DEBUG(5, ("server announced more bytes than sent\n"));
 195                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 196                 return;
 197         }
 198
 199         inbuf = cli_smb_inbuf(subreq);
 200         state->buf = (uint8_t *)smb_base(inbuf) + SVAL(vwv+6, 0);
 201
 202         if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
 203             || ((state->received != 0) && (state->buf < bytes))) {
 204                 DEBUG(5, ("server returned invalid read&x data offset\n"));
 205                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 206                 return;
 207         }
 208         tevent_req_done(req);
 209 }
 210
 211 /*
 212  * Pull the data out of a finished async read_and_x request. rcvbuf is
 213  * talloced from the request, so better make sure that you copy it away before
 214  * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
 215  * talloc_move it!
 216  */
 217
 218 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
 219                             uint8_t **rcvbuf)
 220 {
 221         struct cli_read_andx_state *state = tevent_req_data(
 222                 req, struct cli_read_andx_state);
 223         NTSTATUS status;
 224
 225         if (tevent_req_is_nterror(req, &status)) {
 226                 return status;
 227         }
 228         *received = state->received;
 229         *rcvbuf = state->buf;
 230         return NT_STATUS_OK;
 231 }
 232
 233 struct cli_readall_state {
 234         struct tevent_context *ev;
 235         struct cli_state *cli;
 236         uint16_t fnum;
 237         off_t start_offset;
 238         size_t size;
 239         size_t received;
 240         uint8_t *buf;
 241 };
 242
 243 static void cli_readall_done(struct tevent_req *subreq);
 244
 245 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
 246                                            struct event_context *ev,
 247                                            struct cli_state *cli,
 248                                            uint16_t fnum,
 249                                            off_t offset, size_t size)
 250 {
 251         struct tevent_req *req, *subreq;
 252         struct cli_readall_state *state;
 253
 254         req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
 255         if (req == NULL) {
 256                 return NULL;
 257         }
 258         state->ev = ev;
 259         state->cli = cli;
 260         state->fnum = fnum;
 261         state->start_offset = offset;
 262         state->size = size;
 263         state->received = 0;
 264         state->buf = NULL;
 265
 266         subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
 267         if (tevent_req_nomem(subreq, req)) {
 268                 return tevent_req_post(req, ev);
 269         }
 270         tevent_req_set_callback(subreq, cli_readall_done, req);
 271         return req;
 272 }
 273
 274 static void cli_readall_done(struct tevent_req *subreq)
 275 {
 276         struct tevent_req *req = tevent_req_callback_data(
 277                 subreq, struct tevent_req);
 278         struct cli_readall_state *state = tevent_req_data(
 279                 req, struct cli_readall_state);
 280         ssize_t received;
 281         uint8_t *buf;
 282         NTSTATUS status;
 283
 284         status = cli_read_andx_recv(subreq, &received, &buf);
 285         if (!NT_STATUS_IS_OK(status)) {
 286                 tevent_req_nterror(req, status);
 287                 return;
 288         }
 289
 290         if ((state->received == 0) && (received == state->size)) {
 291                 /* Ideal case: Got it all in one run */
 292                 state->buf = buf;
 293                 state->received += received;
 294                 tevent_req_done(req);
 295                 return;
 296         }
 297
 298         /*
 299          * We got a short read, issue a read for the
 300          * rest. Unfortunately we have to allocate the buffer
 301          * ourselves now, as our caller expects to receive a single
 302          * buffer. cli_read_andx does it from the buffer received from
 303          * the net, but with a short read we have to put it together
 304          * from several reads.
 305          */
 306
 307         if (state->buf == NULL) {
 308                 state->buf = talloc_array(state, uint8_t, state->size);
 309                 if (tevent_req_nomem(state->buf, req)) {
 310                         return;
 311                 }
 312         }
 313         memcpy(state->buf + state->received, buf, received);
 314         state->received += received;
 315
 316         TALLOC_FREE(subreq);
 317
 318         if (state->received >= state->size) {
 319                 tevent_req_done(req);
 320                 return;
 321         }
 322
 323         subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
 324                                     state->start_offset + state->received,
 325                                     state->size - state->received);
 326         if (tevent_req_nomem(subreq, req)) {
 327                 return;
 328         }
 329         tevent_req_set_callback(subreq, cli_readall_done, req);
 330 }
 331
 332 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
 333                                  uint8_t **rcvbuf)
 334 {
 335         struct cli_readall_state *state = tevent_req_data(
 336                 req, struct cli_readall_state);
 337         NTSTATUS status;
 338
 339         if (tevent_req_is_nterror(req, &status)) {
 340                 return status;
 341         }
 342         *received = state->received;
 343         *rcvbuf = state->buf;
 344         return NT_STATUS_OK;
 345 }
 346
 347 struct cli_pull_subreq {
 348         struct tevent_req *req;
 349         ssize_t received;
 350         uint8_t *buf;
 351 };
 352
 353 /*
 354  * Parallel read support.
 355  *
 356  * cli_pull sends as many read&x requests as the server would allow via
 357  * max_mux at a time. When replies flow back in, the data is written into
 358  * the callback function "sink" in the right order.
 359  */
 360
 361 struct cli_pull_state {
 362         struct tevent_req *req;
 363
 364         struct event_context *ev;
 365         struct cli_state *cli;
 366         uint16_t fnum;
 367         off_t start_offset;
 368         SMB_OFF_T size;
 369
 370         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 371         void *priv;
 372
 373         size_t chunk_size;
 374
 375         /*
 376          * Outstanding requests
 377          */
 378         int num_reqs;
 379         struct cli_pull_subreq *reqs;
 380
 381         /*
 382          * For how many bytes did we send requests already?
 383          */
 384         SMB_OFF_T requested;
 385
 386         /*
 387          * Next request index to push into "sink". This walks around the "req"
 388          * array, taking care that the requests are pushed to "sink" in the
 389          * right order. If necessary (i.e. replies don't come in in the right
 390          * order), replies are held back in "reqs".
 391          */
 392         int top_req;
 393
 394         /*
 395          * How many bytes did we push into "sink"?
 396          */
 397
 398         SMB_OFF_T pushed;
 399 };
 400
 401 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
 402 {
 403         struct cli_pull_state *state = tevent_req_data(
 404                 req, struct cli_pull_state);
 405         char *result;
 406
 407         result = tevent_req_print(mem_ctx, req);
 408         if (result == NULL) {
 409                 return NULL;
 410         }
 411
 412         return talloc_asprintf_append_buffer(
 413                 result, "num_reqs=%d, top_req=%d",
 414                 state->num_reqs, state->top_req);
 415 }
 416
 417 static void cli_pull_read_done(struct tevent_req *read_req);
 418
 419 /*
 420  * Prepare an async pull request
 421  */
 422
 423 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 424                                  struct event_context *ev,
 425                                  struct cli_state *cli,
 426                                  uint16_t fnum, off_t start_offset,
 427                                  SMB_OFF_T size, size_t window_size,
 428                                  NTSTATUS (*sink)(char *buf, size_t n,
 429                                                   void *priv),
 430                                  void *priv)
 431 {
 432         struct tevent_req *req;
 433         struct cli_pull_state *state;
 434         int i;
 435
 436         req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
 437         if (req == NULL) {
 438                 return NULL;
 439         }
 440         tevent_req_set_print_fn(req, cli_pull_print);
 441         state->req = req;
 442
 443         state->cli = cli;
 444         state->ev = ev;
 445         state->fnum = fnum;
 446         state->start_offset = start_offset;
 447         state->size = size;
 448         state->sink = sink;
 449         state->priv = priv;
 450
 451         state->pushed = 0;
 452         state->top_req = 0;
 453
 454         if (size == 0) {
 455                 tevent_req_done(req);
 456                 return tevent_req_post(req, ev);
 457         }
 458
 459         state->chunk_size = cli_read_max_bufsize(cli);
 460
 461         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 462         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 463
 464         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
 465                                         state->num_reqs);
 466         if (state->reqs == NULL) {
 467                 goto failed;
 468         }
 469
 470         state->requested = 0;
 471
 472         for (i=0; i<state->num_reqs; i++) {
 473                 struct cli_pull_subreq *subreq = &state->reqs[i];
 474                 SMB_OFF_T size_left;
 475                 size_t request_thistime;
 476
 477                 if (state->requested >= size) {
 478                         state->num_reqs = i;
 479                         break;
 480                 }
 481
 482                 size_left = size - state->requested;
 483                 request_thistime = MIN(size_left, state->chunk_size);
 484
 485                 subreq->req = cli_readall_send(
 486                         state->reqs, ev, cli, fnum,
 487                         state->start_offset + state->requested,
 488                         request_thistime);
 489
 490                 if (subreq->req == NULL) {
 491                         goto failed;
 492                 }
 493                 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
 494                 state->requested += request_thistime;
 495         }
 496         return req;
 497
 498 failed:
 499         TALLOC_FREE(req);
 500         return NULL;
 501 }
 502
 503 /*
 504  * Handle incoming read replies, push the data into sink and send out new
 505  * requests if necessary.
 506  */
 507
 508 static void cli_pull_read_done(struct tevent_req *subreq)
 509 {
 510         struct tevent_req *req = tevent_req_callback_data(
 511                 subreq, struct tevent_req);
 512         struct cli_pull_state *state = tevent_req_data(
 513                 req, struct cli_pull_state);
 514         struct cli_pull_subreq *pull_subreq = NULL;
 515         NTSTATUS status;
 516         int i;
 517
 518         for (i = 0; i < state->num_reqs; i++) {
 519                 pull_subreq = &state->reqs[i];
 520                 if (subreq == pull_subreq->req) {
 521                         break;
 522                 }
 523         }
 524         if (i == state->num_reqs) {
 525                 /* Huh -- received something we did not send?? */
 526                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 527                 return;
 528         }
 529
 530         status = cli_readall_recv(subreq, &pull_subreq->received,
 531                                   &pull_subreq->buf);
 532         if (!NT_STATUS_IS_OK(status)) {
 533                 tevent_req_nterror(state->req, status);
 534                 return;
 535         }
 536
 537         /*
 538          * This loop is the one to take care of out-of-order replies. All
 539          * pending requests are in state->reqs, state->reqs[top_req] is the
 540          * one that is to be pushed next. If however a request later than
 541          * top_req is replied to, then we can't push yet. If top_req is
 542          * replied to at a later point then, we need to push all the finished
 543          * requests.
 544          */
 545
 546         while (state->reqs[state->top_req].req != NULL) {
 547                 struct cli_pull_subreq *top_subreq;
 548
 549                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 550                            state->top_req));
 551
 552                 top_subreq = &state->reqs[state->top_req];
 553
 554                 if (tevent_req_is_in_progress(top_subreq->req)) {
 555                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 556                                    "done\n"));
 557                         return;
 558                 }
 559
 560                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 561                            "pushed\n", (int)top_subreq->received,
 562                            (int)state->pushed));
 563
 564                 status = state->sink((char *)top_subreq->buf,
 565                                      top_subreq->received, state->priv);
 566                 if (!NT_STATUS_IS_OK(status)) {
 567                         tevent_req_nterror(state->req, status);
 568                         return;
 569                 }
 570                 state->pushed += top_subreq->received;
 571
 572                 TALLOC_FREE(state->reqs[state->top_req].req);
 573
 574                 if (state->requested < state->size) {
 575                         struct tevent_req *new_req;
 576                         SMB_OFF_T size_left;
 577                         size_t request_thistime;
 578
 579                         size_left = state->size - state->requested;
 580                         request_thistime = MIN(size_left, state->chunk_size);
 581
 582                         DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
 583                                    "at %d, position %d\n",
 584                                    (int)request_thistime,
 585                                    (int)(state->start_offset
 586                                          + state->requested),
 587                                    state->top_req));
 588
 589                         new_req = cli_readall_send(
 590                                 state->reqs, state->ev, state->cli,
 591                                 state->fnum,
 592                                 state->start_offset + state->requested,
 593                                 request_thistime);
 594
 595                         if (tevent_req_nomem(new_req, state->req)) {
 596                                 return;
 597                         }
 598                         tevent_req_set_callback(new_req, cli_pull_read_done,
 599                                                 req);
 600
 601                         state->reqs[state->top_req].req = new_req;
 602                         state->requested += request_thistime;
 603                 }
 604
 605                 state->top_req = (state->top_req+1) % state->num_reqs;
 606         }
 607
 608         tevent_req_done(req);
 609 }
 610
 611 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
 612 {
 613         struct cli_pull_state *state = tevent_req_data(
 614                 req, struct cli_pull_state);
 615         NTSTATUS status;
 616
 617         if (tevent_req_is_nterror(req, &status)) {
 618                 return status;
 619         }
 620         *received = state->pushed;
 621         return NT_STATUS_OK;
 622 }
 623
 624 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
 625                   off_t start_offset, SMB_OFF_T size, size_t window_size,
 626                   NTSTATUS (*sink)(char *buf, size_t n, void *priv),
 627                   void *priv, SMB_OFF_T *received)
 628 {
 629         TALLOC_CTX *frame = talloc_stackframe();
 630         struct event_context *ev;
 631         struct tevent_req *req;
 632         NTSTATUS status = NT_STATUS_OK;
 633
 634         if (cli_has_async_calls(cli)) {
 635                 /*
 636                  * Can't use sync call while an async call is in flight
 637                  */
 638                 status = NT_STATUS_INVALID_PARAMETER;
 639                 goto fail;
 640         }
 641
 642         ev = event_context_init(frame);
 643         if (ev == NULL) {
 644                 status = NT_STATUS_NO_MEMORY;
 645                 goto fail;
 646         }
 647
 648         req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
 649                             window_size, sink, priv);
 650         if (req == NULL) {
 651                 status = NT_STATUS_NO_MEMORY;
 652                 goto fail;
 653         }
 654
 655         if (!tevent_req_poll(req, ev)) {
 656                 status = map_nt_error_from_unix(errno);
 657                 goto fail;
 658         }
 659
 660         status = cli_pull_recv(req, received);
 661  fail:
 662         TALLOC_FREE(frame);
 663         if (!NT_STATUS_IS_OK(status)) {
 664                 cli_set_error(cli, status);
 665         }
 666         return status;
 667 }
 668
 669 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
 670 {
 671         char **pbuf = (char **)priv;
 672         memcpy(*pbuf, buf, n);
 673         *pbuf += n;
 674         return NT_STATUS_OK;
 675 }
 676
 677 ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
 678                  off_t offset, size_t size)
 679 {
 680         NTSTATUS status;
 681         SMB_OFF_T ret;
 682
 683         status = cli_pull(cli, fnum, offset, size, size,
 684                           cli_read_sink, &buf, &ret);
 685         if (!NT_STATUS_IS_OK(status)) {
 686                 cli_set_error(cli, status);
 687                 return -1;
 688         }
 689         return ret;
 690 }
 691
 692 /****************************************************************************
 693  Issue a single SMBwrite and don't wait for a reply.
 694 ****************************************************************************/
 695
 696 static bool cli_issue_write(struct cli_state *cli,
 697                                 uint16_t fnum,
 698                                 off_t offset,
 699                                 uint16 mode,
 700                                 const char *buf,
 701                                 size_t size,
 702                                 int i)
 703 {
 704         char *p;
 705         bool large_writex = false;
 706         /* We can only do direct writes if not signing and not encrypting. */
 707         bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
 708
 709         if (!direct_writes && size + 1 > cli->bufsize) {
 710                 cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
 711                 if (!cli->outbuf) {
 712                         return False;
 713                 }
 714                 cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
 715                 if (cli->inbuf == NULL) {
 716                         SAFE_FREE(cli->outbuf);
 717                         return False;
 718                 }
 719                 cli->bufsize = size + 1024;
 720         }
 721
 722         memset(cli->outbuf,'\0',smb_size);
 723         memset(cli->inbuf,'\0',smb_size);
 724
 725         if (cli->capabilities & CAP_LARGE_FILES) {
 726                 large_writex = True;
 727         }
 728
 729         if (large_writex) {
 730                 cli_set_message(cli->outbuf,14,0,True);
 731         } else {
 732                 cli_set_message(cli->outbuf,12,0,True);
 733         }
 734
 735         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 736         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 737         cli_setup_packet(cli);
 738
 739         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 740         SSVAL(cli->outbuf,smb_vwv2,fnum);
 741
 742         SIVAL(cli->outbuf,smb_vwv3,offset);
 743         SIVAL(cli->outbuf,smb_vwv5,0);
 744         SSVAL(cli->outbuf,smb_vwv7,mode);
 745
 746         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 747         /*
 748          * According to CIFS-TR-1p00, this following field should only
 749          * be set if CAP_LARGE_WRITEX is set. We should check this
 750          * locally. However, this check might already have been
 751          * done by our callers.
 752          */
 753         SSVAL(cli->outbuf,smb_vwv9,(size>>16));
 754         SSVAL(cli->outbuf,smb_vwv10,size);
 755         /* +1 is pad byte. */
 756         SSVAL(cli->outbuf,smb_vwv11,
 757               smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
 758
 759         if (large_writex) {
 760                 SIVAL(cli->outbuf,smb_vwv12,(((uint64_t)offset)>>32) & 0xffffffff);
 761         }
 762
 763         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
 764         *p++ = '\0'; /* pad byte. */
 765         if (!direct_writes) {
 766                 memcpy(p, buf, size);
 767         }
 768         if (size > 0x1FFFF) {
 769                 /* This is a POSIX 14 word large write. */
 770                 set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
 771                 _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
 772         } else {
 773                 cli_setup_bcc(cli, p+size);
 774         }
 775
 776         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 777
 778         show_msg(cli->outbuf);
 779         if (direct_writes) {
 780                 /* For direct writes we now need to write the data
 781                  * directly out of buf. */
 782                 return cli_send_smb_direct_writeX(cli, buf, size);
 783         } else {
 784                 return cli_send_smb(cli);
 785         }
 786 }
 787
 788 /****************************************************************************
 789   write to a file
 790   write_mode: 0x0001 disallow write cacheing
 791               0x0002 return bytes remaining
 792               0x0004 use raw named pipe protocol
 793               0x0008 start of message mode named pipe protocol
 794 ****************************************************************************/
 795
 796 ssize_t cli_write(struct cli_state *cli,
 797                  uint16_t fnum, uint16 write_mode,
 798                  const char *buf, off_t offset, size_t size)
 799 {
 800         ssize_t bwritten = 0;
 801         unsigned int issued = 0;
 802         unsigned int received = 0;
 803         int mpx = 1;
 804         size_t writesize;
 805         int blocks;
 806
 807         if(cli->max_mux > 1) {
 808                 mpx = cli->max_mux-1;
 809         } else {
 810                 mpx = 1;
 811         }
 812
 813         writesize = cli_write_max_bufsize(cli, write_mode);
 814
 815         blocks = (size + (writesize-1)) / writesize;
 816
 817         while (received < blocks) {
 818
 819                 while ((issued - received < mpx) && (issued < blocks)) {
 820                         ssize_t bsent = issued * writesize;
 821                         ssize_t size1 = MIN(writesize, size - bsent);
 822
 823                         if (!cli_issue_write(cli, fnum, offset + bsent,
 824                                         write_mode,
 825                                         buf + bsent,
 826                                         size1, issued))
 827                                 return -1;
 828                         issued++;
 829                 }
 830
 831                 if (!cli_receive_smb(cli)) {
 832                         return bwritten;
 833                 }
 834
 835                 received++;
 836
 837                 if (cli_is_error(cli))
 838                         break;
 839
 840                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 841                 if (writesize > 0xFFFF) {
 842                         bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
 843                 }
 844         }
 845
 846         while (received < issued && cli_receive_smb(cli)) {
 847                 received++;
 848         }
 849
 850         return bwritten;
 851 }
 852
 853 /****************************************************************************
 854   write to a file using a SMBwrite and not bypassing 0 byte writes
 855 ****************************************************************************/
 856
 857 ssize_t cli_smbwrite(struct cli_state *cli,
 858                      uint16_t fnum, char *buf, off_t offset, size_t size1)
 859 {
 860         char *p;
 861         ssize_t total = 0;
 862
 863         do {
 864                 size_t size = MIN(size1, cli->max_xmit - 48);
 865
 866                 memset(cli->outbuf,'\0',smb_size);
 867                 memset(cli->inbuf,'\0',smb_size);
 868
 869                 cli_set_message(cli->outbuf,5, 0,True);
 870
 871                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 872                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 873                 cli_setup_packet(cli);
 874
 875                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 876                 SSVAL(cli->outbuf,smb_vwv1,size);
 877                 SIVAL(cli->outbuf,smb_vwv2,offset);
 878                 SSVAL(cli->outbuf,smb_vwv4,0);
 879
 880                 p = smb_buf(cli->outbuf);
 881                 *p++ = 1;
 882                 SSVAL(p, 0, size); p += 2;
 883                 memcpy(p, buf + total, size); p += size;
 884
 885                 cli_setup_bcc(cli, p);
 886
 887                 if (!cli_send_smb(cli))
 888                         return -1;
 889
 890                 if (!cli_receive_smb(cli))
 891                         return -1;
 892
 893                 if (cli_is_error(cli))
 894                         return -1;
 895
 896                 size = SVAL(cli->inbuf,smb_vwv0);
 897                 if (size == 0)
 898                         break;
 899
 900                 size1 -= size;
 901                 total += size;
 902                 offset += size;
 903
 904         } while (size1);
 905
 906         return total;
 907 }
 908
 909 /*
 910  * Send a write&x request
 911  */
 912
 913 struct cli_write_andx_state {
 914         size_t size;
 915         uint16_t vwv[14];
 916         size_t written;
 917         uint8_t pad;
 918         struct iovec iov[2];
 919 };
 920
 921 static void cli_write_andx_done(struct tevent_req *subreq);
 922
 923 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
 924                                          struct event_context *ev,
 925                                          struct cli_state *cli, uint16_t fnum,
 926                                          uint16_t mode, const uint8_t *buf,
 927                                          off_t offset, size_t size,
 928                                          struct tevent_req **reqs_before,
 929                                          int num_reqs_before,
 930                                          struct tevent_req **psmbreq)
 931 {
 932         struct tevent_req *req, *subreq;
 933         struct cli_write_andx_state *state;
 934         bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
 935         uint8_t wct = bigoffset ? 14 : 12;
 936         size_t max_write = cli_write_max_bufsize(cli, mode);
 937         uint16_t *vwv;
 938
 939         req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
 940         if (req == NULL) {
 941                 return NULL;
 942         }
 943
 944         size = MIN(size, max_write);
 945
 946         vwv = state->vwv;
 947
 948         SCVAL(vwv+0, 0, 0xFF);
 949         SCVAL(vwv+0, 1, 0);
 950         SSVAL(vwv+1, 0, 0);
 951         SSVAL(vwv+2, 0, fnum);
 952         SIVAL(vwv+3, 0, offset);
 953         SIVAL(vwv+5, 0, 0);
 954         SSVAL(vwv+7, 0, mode);
 955         SSVAL(vwv+8, 0, 0);
 956         SSVAL(vwv+9, 0, (size>>16));
 957         SSVAL(vwv+10, 0, size);
 958
 959         SSVAL(vwv+11, 0,
 960               cli_smb_wct_ofs(reqs_before, num_reqs_before)
 961               + 1               /* the wct field */
 962               + wct * 2         /* vwv */
 963               + 2               /* num_bytes field */
 964               + 1               /* pad */);
 965
 966         if (bigoffset) {
 967                 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
 968         }
 969
 970         state->pad = 0;
 971         state->iov[0].iov_base = (void *)&state->pad;
 972         state->iov[0].iov_len = 1;
 973         state->iov[1].iov_base = CONST_DISCARD(void *, buf);
 974         state->iov[1].iov_len = size;
 975
 976         subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
 977                                     2, state->iov);
 978         if (tevent_req_nomem(subreq, req)) {
 979                 return tevent_req_post(req, ev);
 980         }
 981         tevent_req_set_callback(subreq, cli_write_andx_done, req);
 982         *psmbreq = subreq;
 983         return req;
 984 }
 985
 986 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
 987                                        struct event_context *ev,
 988                                        struct cli_state *cli, uint16_t fnum,
 989                                        uint16_t mode, const uint8_t *buf,
 990                                        off_t offset, size_t size)
 991 {
 992         struct tevent_req *req, *subreq;
 993         NTSTATUS status;
 994
 995         req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
 996                                     size, NULL, 0, &subreq);
 997         if (req == NULL) {
 998                 return NULL;
 999         }
1000
1001         status = cli_smb_req_send(subreq);
1002         if (!NT_STATUS_IS_OK(status)) {
1003                 tevent_req_nterror(req, status);
1004                 return tevent_req_post(req, ev);
1005         }
1006         return req;
1007 }
1008
1009 static void cli_write_andx_done(struct tevent_req *subreq)
1010 {
1011         struct tevent_req *req = tevent_req_callback_data(
1012                 subreq, struct tevent_req);
1013         struct cli_write_andx_state *state = tevent_req_data(
1014                 req, struct cli_write_andx_state);
1015         uint8_t wct;
1016         uint16_t *vwv;
1017         NTSTATUS status;
1018
1019         status = cli_smb_recv(subreq, 6, &wct, &vwv, NULL, NULL);
1020         if (NT_STATUS_IS_ERR(status)) {
1021                 TALLOC_FREE(subreq);
1022                 tevent_req_nterror(req, status);
1023                 return;
1024         }
1025         state->written = SVAL(vwv+2, 0);
1026         state->written |= SVAL(vwv+4, 0)<<16;
1027         tevent_req_done(req);
1028 }
1029
1030 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
1031 {
1032         struct cli_write_andx_state *state = tevent_req_data(
1033                 req, struct cli_write_andx_state);
1034         NTSTATUS status;
1035
1036         if (tevent_req_is_nterror(req, &status)) {
1037                 return status;
1038         }
1039         *pwritten = state->written;
1040         return NT_STATUS_OK;
1041 }
1042
1043 struct cli_writeall_state {
1044         struct event_context *ev;
1045         struct cli_state *cli;
1046         uint16_t fnum;
1047         uint16_t mode;
1048         const uint8_t *buf;
1049         off_t offset;
1050         size_t size;
1051         size_t written;
1052 };
1053
1054 static void cli_writeall_written(struct tevent_req *req);
1055
1056 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
1057                                             struct event_context *ev,
1058                                             struct cli_state *cli,
1059                                             uint16_t fnum,
1060                                             uint16_t mode,
1061                                             const uint8_t *buf,
1062                                             off_t offset, size_t size)
1063 {
1064         struct tevent_req *req, *subreq;
1065         struct cli_writeall_state *state;
1066
1067         req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
1068         if (req == NULL) {
1069                 return NULL;
1070         }
1071         state->ev = ev;
1072         state->cli = cli;
1073         state->fnum = fnum;
1074         state->mode = mode;
1075         state->buf = buf;
1076         state->offset = offset;
1077         state->size = size;
1078         state->written = 0;
1079
1080         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1081                                      state->mode, state->buf, state->offset,
1082                                      state->size);
1083         if (tevent_req_nomem(subreq, req)) {
1084                 return tevent_req_post(req, ev);
1085         }
1086         tevent_req_set_callback(subreq, cli_writeall_written, req);
1087         return req;
1088 }
1089
1090 static void cli_writeall_written(struct tevent_req *subreq)
1091 {
1092         struct tevent_req *req = tevent_req_callback_data(
1093                 subreq, struct tevent_req);
1094         struct cli_writeall_state *state = tevent_req_data(
1095                 req, struct cli_writeall_state);
1096         NTSTATUS status;
1097         size_t written, to_write;
1098
1099         status = cli_write_andx_recv(subreq, &written);
1100         TALLOC_FREE(subreq);
1101         if (!NT_STATUS_IS_OK(status)) {
1102                 tevent_req_nterror(req, status);
1103                 return;
1104         }
1105
1106         state->written += written;
1107
1108         if (state->written > state->size) {
1109                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
1110                 return;
1111         }
1112
1113         to_write = state->size - state->written;
1114
1115         if (to_write == 0) {
1116                 tevent_req_done(req);
1117                 return;
1118         }
1119
1120         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1121                                      state->mode,
1122                                      state->buf + state->written,
1123                                      state->offset + state->written, to_write);
1124         if (tevent_req_nomem(subreq, req)) {
1125                 return;
1126         }
1127         tevent_req_set_callback(subreq, cli_writeall_written, req);
1128 }
1129
1130 static NTSTATUS cli_writeall_recv(struct tevent_req *req)
1131 {
1132         return tevent_req_simple_recv_ntstatus(req);
1133 }
1134
1135 struct cli_push_write_state {
1136         struct tevent_req *req;/* This is the main request! Not the subreq */
1137         uint32_t idx;
1138         off_t ofs;
1139         uint8_t *buf;
1140         size_t size;
1141 };
1142
1143 struct cli_push_state {
1144         struct event_context *ev;
1145         struct cli_state *cli;
1146         uint16_t fnum;
1147         uint16_t mode;
1148         off_t start_offset;
1149         size_t window_size;
1150
1151         size_t (*source)(uint8_t *buf, size_t n, void *priv);
1152         void *priv;
1153
1154         bool eof;
1155
1156         size_t chunk_size;
1157         off_t next_offset;
1158
1159         /*
1160          * Outstanding requests
1161          */
1162         uint32_t pending;
1163         uint32_t num_reqs;
1164         struct cli_push_write_state **reqs;
1165 };
1166
1167 static void cli_push_written(struct tevent_req *req);
1168
1169 static bool cli_push_write_setup(struct tevent_req *req,
1170                                  struct cli_push_state *state,
1171                                  uint32_t idx)
1172 {
1173         struct cli_push_write_state *substate;
1174         struct tevent_req *subreq;
1175
1176         substate = talloc(state->reqs, struct cli_push_write_state);
1177         if (!substate) {
1178                 return false;
1179         }
1180         substate->req = req;
1181         substate->idx = idx;
1182         substate->ofs = state->next_offset;
1183         substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1184         if (!substate->buf) {
1185                 talloc_free(substate);
1186                 return false;
1187         }
1188         substate->size = state->source(substate->buf,
1189                                        state->chunk_size,
1190                                        state->priv);
1191         if (substate->size == 0) {
1192                 state->eof = true;
1193                 /* nothing to send */
1194                 talloc_free(substate);
1195                 return true;
1196         }
1197
1198         subreq = cli_writeall_send(substate,
1199                                    state->ev, state->cli,
1200                                    state->fnum, state->mode,
1201                                    substate->buf,
1202                                    substate->ofs,
1203                                    substate->size);
1204         if (!subreq) {
1205                 talloc_free(substate);
1206                 return false;
1207         }
1208         tevent_req_set_callback(subreq, cli_push_written, substate);
1209
1210         state->reqs[idx] = substate;
1211         state->pending += 1;
1212         state->next_offset += substate->size;
1213
1214         return true;
1215 }
1216
1217 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1218                                  struct cli_state *cli,
1219                                  uint16_t fnum, uint16_t mode,
1220                                  off_t start_offset, size_t window_size,
1221                                  size_t (*source)(uint8_t *buf, size_t n,
1222                                                   void *priv),
1223                                  void *priv)
1224 {
1225         struct tevent_req *req;
1226         struct cli_push_state *state;
1227         uint32_t i;
1228
1229         req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1230         if (req == NULL) {
1231                 return NULL;
1232         }
1233         state->cli = cli;
1234         state->ev = ev;
1235         state->fnum = fnum;
1236         state->start_offset = start_offset;
1237         state->mode = mode;
1238         state->source = source;
1239         state->priv = priv;
1240         state->eof = false;
1241         state->pending = 0;
1242         state->next_offset = start_offset;
1243
1244         state->chunk_size = cli_write_max_bufsize(cli, mode);
1245
1246         if (window_size == 0) {
1247                 window_size = cli->max_mux * state->chunk_size;
1248         }
1249         state->num_reqs = window_size/state->chunk_size;
1250         if ((window_size % state->chunk_size) > 0) {
1251                 state->num_reqs += 1;
1252         }
1253         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1254         state->num_reqs = MAX(state->num_reqs, 1);
1255
1256         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
1257                                         state->num_reqs);
1258         if (state->reqs == NULL) {
1259                 goto failed;
1260         }
1261
1262         for (i=0; i<state->num_reqs; i++) {
1263                 if (!cli_push_write_setup(req, state, i)) {
1264                         goto failed;
1265                 }
1266
1267                 if (state->eof) {
1268                         break;
1269                 }
1270         }
1271
1272         if (state->pending == 0) {
1273                 tevent_req_done(req);
1274                 return tevent_req_post(req, ev);
1275         }
1276
1277         return req;
1278
1279  failed:
1280         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1281         return tevent_req_post(req, ev);
1282 }
1283
1284 static void cli_push_written(struct tevent_req *subreq)
1285 {
1286         struct cli_push_write_state *substate = tevent_req_callback_data(
1287                 subreq, struct cli_push_write_state);
1288         struct tevent_req *req = substate->req;
1289         struct cli_push_state *state = tevent_req_data(
1290                 req, struct cli_push_state);
1291         NTSTATUS status;
1292         uint32_t idx = substate->idx;
1293
1294         state->reqs[idx] = NULL;
1295         state->pending -= 1;
1296
1297         status = cli_writeall_recv(subreq);
1298         TALLOC_FREE(subreq);
1299         TALLOC_FREE(substate);
1300         if (!NT_STATUS_IS_OK(status)) {
1301                 tevent_req_nterror(req, status);
1302                 return;
1303         }
1304
1305         if (!state->eof) {
1306                 if (!cli_push_write_setup(req, state, idx)) {
1307                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1308                         return;
1309                 }
1310         }
1311
1312         if (state->pending == 0) {
1313                 tevent_req_done(req);
1314                 return;
1315         }
1316 }
1317
1318 NTSTATUS cli_push_recv(struct tevent_req *req)
1319 {
1320         return tevent_req_simple_recv_ntstatus(req);
1321 }
1322
1323 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1324                   off_t start_offset, size_t window_size,
1325                   size_t (*source)(uint8_t *buf, size_t n, void *priv),
1326                   void *priv)
1327 {
1328         TALLOC_CTX *frame = talloc_stackframe();
1329         struct event_context *ev;
1330         struct tevent_req *req;
1331         NTSTATUS status = NT_STATUS_OK;
1332
1333         if (cli_has_async_calls(cli)) {
1334                 /*
1335                  * Can't use sync call while an async call is in flight
1336                  */
1337                 status = NT_STATUS_INVALID_PARAMETER;
1338                 goto fail;
1339         }
1340
1341         ev = event_context_init(frame);
1342         if (ev == NULL) {
1343                 status = NT_STATUS_NO_MEMORY;
1344                 goto fail;
1345         }
1346
1347         req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1348                             window_size, source, priv);
1349         if (req == NULL) {
1350                 status = NT_STATUS_NO_MEMORY;
1351                 goto fail;
1352         }
1353
1354         if (!tevent_req_poll(req, ev)) {
1355                 status = map_nt_error_from_unix(errno);
1356                 goto fail;
1357         }
1358
1359         status = cli_push_recv(req);
1360  fail:
1361         TALLOC_FREE(frame);
1362         if (!NT_STATUS_IS_OK(status)) {
1363                 cli_set_error(cli, status);
1364         }
1365         return status;
1366 }