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 #include "async_smb.h"
  22
  23 /****************************************************************************
  24   Calculate the recommended read buffer size
  25 ****************************************************************************/
  26 static size_t cli_read_max_bufsize(struct cli_state *cli)
  27 {
  28         if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
  29             && (cli->server_posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
  30                 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
  31         }
  32         if (cli->capabilities & CAP_LARGE_READX) {
  33                 return cli->is_samba
  34                         ? CLI_SAMBA_MAX_LARGE_READX_SIZE
  35                         : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
  36         }
  37         return (cli->max_xmit - (smb_size+32)) & ~1023;
  38 }
  39
  40 /****************************************************************************
  41   Calculate the recommended write buffer size
  42 ****************************************************************************/
  43 static size_t cli_write_max_bufsize(struct cli_state *cli, uint16_t write_mode)
  44 {
  45         if (write_mode == 0 &&
  46             !client_is_signing_on(cli) &&
  47             !cli_encryption_on(cli) &&
  48             (cli->server_posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
  49             (cli->capabilities & CAP_LARGE_FILES)) {
  50                 /* Only do massive writes if we can do them direct
  51                  * with no signing or encrypting - not on a pipe. */
  52                 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
  53         }
  54
  55         if (cli->is_samba) {
  56                 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
  57         }
  58
  59         if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
  60             || client_is_signing_on(cli)
  61             || strequal(cli->dev, "LPT1:")) {
  62
  63                 /*
  64                  * Printer devices are restricted to max_xmit writesize in
  65                  * Vista and XPSP3 as are signing connections.
  66                  */
  67
  68                 return (cli->max_xmit - (smb_size+32)) & ~1023;
  69         }
  70
  71         return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
  72 }
  73
  74 struct cli_read_andx_state {
  75         size_t size;
  76         uint16_t vwv[12];
  77         NTSTATUS status;
  78         size_t received;
  79         uint8_t *buf;
  80 };
  81
  82 static void cli_read_andx_done(struct tevent_req *subreq);
  83
  84 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
  85                                         struct event_context *ev,
  86                                         struct cli_state *cli, uint16_t fnum,
  87                                         off_t offset, size_t size,
  88                                         struct tevent_req **psmbreq)
  89 {
  90         struct tevent_req *req, *subreq;
  91         struct cli_read_andx_state *state;
  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                 SIVAL(state->vwv + 10, 0,
 120                       (((uint64_t)offset)>>32) & 0xffffffff);
 121                 wct += 2;
 122         }
 123
 124         subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
 125                                     state->vwv, 0, NULL);
 126         if (subreq == NULL) {
 127                 TALLOC_FREE(req);
 128                 return NULL;
 129         }
 130         tevent_req_set_callback(subreq, cli_read_andx_done, req);
 131         *psmbreq = subreq;
 132         return req;
 133 }
 134
 135 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
 136                                       struct event_context *ev,
 137                                       struct cli_state *cli, uint16_t fnum,
 138                                       off_t offset, size_t size)
 139 {
 140         struct tevent_req *req, *subreq;
 141         NTSTATUS status;
 142
 143         req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
 144                                    &subreq);
 145         if (req == NULL) {
 146                 return NULL;
 147         }
 148
 149         status = cli_smb_req_send(subreq);
 150         if (!NT_STATUS_IS_OK(status)) {
 151                 tevent_req_nterror(req, status);
 152                 return tevent_req_post(req, ev);
 153         }
 154         return req;
 155 }
 156
 157 static void cli_read_andx_done(struct tevent_req *subreq)
 158 {
 159         struct tevent_req *req = tevent_req_callback_data(
 160                 subreq, struct tevent_req);
 161         struct cli_read_andx_state *state = tevent_req_data(
 162                 req, struct cli_read_andx_state);
 163         uint8_t *inbuf;
 164         uint8_t wct;
 165         uint16_t *vwv;
 166         uint32_t num_bytes;
 167         uint8_t *bytes;
 168
 169         state->status = cli_smb_recv(subreq, state, &inbuf, 12, &wct, &vwv,
 170                                      &num_bytes, &bytes);
 171         TALLOC_FREE(subreq);
 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         state->buf = (uint8_t *)smb_base(inbuf) + SVAL(vwv+6, 0);
 200
 201         if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
 202             || ((state->received != 0) && (state->buf < bytes))) {
 203                 DEBUG(5, ("server returned invalid read&x data offset\n"));
 204                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 205                 return;
 206         }
 207         tevent_req_done(req);
 208 }
 209
 210 /*
 211  * Pull the data out of a finished async read_and_x request. rcvbuf is
 212  * talloced from the request, so better make sure that you copy it away before
 213  * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
 214  * talloc_move it!
 215  */
 216
 217 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
 218                             uint8_t **rcvbuf)
 219 {
 220         struct cli_read_andx_state *state = tevent_req_data(
 221                 req, struct cli_read_andx_state);
 222         NTSTATUS status;
 223
 224         if (tevent_req_is_nterror(req, &status)) {
 225                 return status;
 226         }
 227         *received = state->received;
 228         *rcvbuf = state->buf;
 229         return NT_STATUS_OK;
 230 }
 231
 232 struct cli_readall_state {
 233         struct tevent_context *ev;
 234         struct cli_state *cli;
 235         uint16_t fnum;
 236         off_t start_offset;
 237         size_t size;
 238         size_t received;
 239         uint8_t *buf;
 240 };
 241
 242 static void cli_readall_done(struct tevent_req *subreq);
 243
 244 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
 245                                            struct event_context *ev,
 246                                            struct cli_state *cli,
 247                                            uint16_t fnum,
 248                                            off_t offset, size_t size)
 249 {
 250         struct tevent_req *req, *subreq;
 251         struct cli_readall_state *state;
 252
 253         req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
 254         if (req == NULL) {
 255                 return NULL;
 256         }
 257         state->ev = ev;
 258         state->cli = cli;
 259         state->fnum = fnum;
 260         state->start_offset = offset;
 261         state->size = size;
 262         state->received = 0;
 263         state->buf = NULL;
 264
 265         subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
 266         if (tevent_req_nomem(subreq, req)) {
 267                 return tevent_req_post(req, ev);
 268         }
 269         tevent_req_set_callback(subreq, cli_readall_done, req);
 270         return req;
 271 }
 272
 273 static void cli_readall_done(struct tevent_req *subreq)
 274 {
 275         struct tevent_req *req = tevent_req_callback_data(
 276                 subreq, struct tevent_req);
 277         struct cli_readall_state *state = tevent_req_data(
 278                 req, struct cli_readall_state);
 279         ssize_t received;
 280         uint8_t *buf;
 281         NTSTATUS status;
 282
 283         status = cli_read_andx_recv(subreq, &received, &buf);
 284         if (!NT_STATUS_IS_OK(status)) {
 285                 tevent_req_nterror(req, status);
 286                 return;
 287         }
 288
 289         if (received == 0) {
 290                 /* EOF */
 291                 tevent_req_done(req);
 292                 return;
 293         }
 294
 295         if ((state->received == 0) && (received == state->size)) {
 296                 /* Ideal case: Got it all in one run */
 297                 state->buf = buf;
 298                 state->received += received;
 299                 tevent_req_done(req);
 300                 return;
 301         }
 302
 303         /*
 304          * We got a short read, issue a read for the
 305          * rest. Unfortunately we have to allocate the buffer
 306          * ourselves now, as our caller expects to receive a single
 307          * buffer. cli_read_andx does it from the buffer received from
 308          * the net, but with a short read we have to put it together
 309          * from several reads.
 310          */
 311
 312         if (state->buf == NULL) {
 313                 state->buf = talloc_array(state, uint8_t, state->size);
 314                 if (tevent_req_nomem(state->buf, req)) {
 315                         return;
 316                 }
 317         }
 318         memcpy(state->buf + state->received, buf, received);
 319         state->received += received;
 320
 321         TALLOC_FREE(subreq);
 322
 323         if (state->received >= state->size) {
 324                 tevent_req_done(req);
 325                 return;
 326         }
 327
 328         subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
 329                                     state->start_offset + state->received,
 330                                     state->size - state->received);
 331         if (tevent_req_nomem(subreq, req)) {
 332                 return;
 333         }
 334         tevent_req_set_callback(subreq, cli_readall_done, req);
 335 }
 336
 337 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
 338                                  uint8_t **rcvbuf)
 339 {
 340         struct cli_readall_state *state = tevent_req_data(
 341                 req, struct cli_readall_state);
 342         NTSTATUS status;
 343
 344         if (tevent_req_is_nterror(req, &status)) {
 345                 return status;
 346         }
 347         *received = state->received;
 348         *rcvbuf = state->buf;
 349         return NT_STATUS_OK;
 350 }
 351
 352 struct cli_pull_subreq {
 353         struct tevent_req *req;
 354         ssize_t received;
 355         uint8_t *buf;
 356 };
 357
 358 /*
 359  * Parallel read support.
 360  *
 361  * cli_pull sends as many read&x requests as the server would allow via
 362  * max_mux at a time. When replies flow back in, the data is written into
 363  * the callback function "sink" in the right order.
 364  */
 365
 366 struct cli_pull_state {
 367         struct tevent_req *req;
 368
 369         struct event_context *ev;
 370         struct cli_state *cli;
 371         uint16_t fnum;
 372         off_t start_offset;
 373         SMB_OFF_T size;
 374
 375         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 376         void *priv;
 377
 378         size_t chunk_size;
 379
 380         /*
 381          * Outstanding requests
 382          */
 383         int num_reqs;
 384         struct cli_pull_subreq *reqs;
 385
 386         /*
 387          * For how many bytes did we send requests already?
 388          */
 389         SMB_OFF_T requested;
 390
 391         /*
 392          * Next request index to push into "sink". This walks around the "req"
 393          * array, taking care that the requests are pushed to "sink" in the
 394          * right order. If necessary (i.e. replies don't come in in the right
 395          * order), replies are held back in "reqs".
 396          */
 397         int top_req;
 398
 399         /*
 400          * How many bytes did we push into "sink"?
 401          */
 402
 403         SMB_OFF_T pushed;
 404 };
 405
 406 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
 407 {
 408         struct cli_pull_state *state = tevent_req_data(
 409                 req, struct cli_pull_state);
 410         char *result;
 411
 412         result = tevent_req_default_print(req, mem_ctx);
 413         if (result == NULL) {
 414                 return NULL;
 415         }
 416
 417         return talloc_asprintf_append_buffer(
 418                 result, "num_reqs=%d, top_req=%d",
 419                 state->num_reqs, state->top_req);
 420 }
 421
 422 static void cli_pull_read_done(struct tevent_req *read_req);
 423
 424 /*
 425  * Prepare an async pull request
 426  */
 427
 428 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 429                                  struct event_context *ev,
 430                                  struct cli_state *cli,
 431                                  uint16_t fnum, off_t start_offset,
 432                                  SMB_OFF_T size, size_t window_size,
 433                                  NTSTATUS (*sink)(char *buf, size_t n,
 434                                                   void *priv),
 435                                  void *priv)
 436 {
 437         struct tevent_req *req;
 438         struct cli_pull_state *state;
 439         int i;
 440
 441         req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
 442         if (req == NULL) {
 443                 return NULL;
 444         }
 445         tevent_req_set_print_fn(req, cli_pull_print);
 446         state->req = req;
 447
 448         state->cli = cli;
 449         state->ev = ev;
 450         state->fnum = fnum;
 451         state->start_offset = start_offset;
 452         state->size = size;
 453         state->sink = sink;
 454         state->priv = priv;
 455
 456         state->pushed = 0;
 457         state->top_req = 0;
 458
 459         if (size == 0) {
 460                 tevent_req_done(req);
 461                 return tevent_req_post(req, ev);
 462         }
 463
 464         state->chunk_size = cli_read_max_bufsize(cli);
 465
 466         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 467         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 468
 469         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
 470                                         state->num_reqs);
 471         if (state->reqs == NULL) {
 472                 goto failed;
 473         }
 474
 475         state->requested = 0;
 476
 477         for (i=0; i<state->num_reqs; i++) {
 478                 struct cli_pull_subreq *subreq = &state->reqs[i];
 479                 SMB_OFF_T size_left;
 480                 size_t request_thistime;
 481
 482                 if (state->requested >= size) {
 483                         state->num_reqs = i;
 484                         break;
 485                 }
 486
 487                 size_left = size - state->requested;
 488                 request_thistime = MIN(size_left, state->chunk_size);
 489
 490                 subreq->req = cli_readall_send(
 491                         state->reqs, ev, cli, fnum,
 492                         state->start_offset + state->requested,
 493                         request_thistime);
 494
 495                 if (subreq->req == NULL) {
 496                         goto failed;
 497                 }
 498                 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
 499                 state->requested += request_thistime;
 500         }
 501         return req;
 502
 503 failed:
 504         TALLOC_FREE(req);
 505         return NULL;
 506 }
 507
 508 /*
 509  * Handle incoming read replies, push the data into sink and send out new
 510  * requests if necessary.
 511  */
 512
 513 static void cli_pull_read_done(struct tevent_req *subreq)
 514 {
 515         struct tevent_req *req = tevent_req_callback_data(
 516                 subreq, struct tevent_req);
 517         struct cli_pull_state *state = tevent_req_data(
 518                 req, struct cli_pull_state);
 519         struct cli_pull_subreq *pull_subreq = NULL;
 520         NTSTATUS status;
 521         int i;
 522
 523         for (i = 0; i < state->num_reqs; i++) {
 524                 pull_subreq = &state->reqs[i];
 525                 if (subreq == pull_subreq->req) {
 526                         break;
 527                 }
 528         }
 529         if (i == state->num_reqs) {
 530                 /* Huh -- received something we did not send?? */
 531                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 532                 return;
 533         }
 534
 535         status = cli_readall_recv(subreq, &pull_subreq->received,
 536                                   &pull_subreq->buf);
 537         if (!NT_STATUS_IS_OK(status)) {
 538                 tevent_req_nterror(state->req, status);
 539                 return;
 540         }
 541
 542         /*
 543          * This loop is the one to take care of out-of-order replies. All
 544          * pending requests are in state->reqs, state->reqs[top_req] is the
 545          * one that is to be pushed next. If however a request later than
 546          * top_req is replied to, then we can't push yet. If top_req is
 547          * replied to at a later point then, we need to push all the finished
 548          * requests.
 549          */
 550
 551         while (state->reqs[state->top_req].req != NULL) {
 552                 struct cli_pull_subreq *top_subreq;
 553
 554                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 555                            state->top_req));
 556
 557                 top_subreq = &state->reqs[state->top_req];
 558
 559                 if (tevent_req_is_in_progress(top_subreq->req)) {
 560                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 561                                    "done\n"));
 562                         return;
 563                 }
 564
 565                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 566                            "pushed\n", (int)top_subreq->received,
 567                            (int)state->pushed));
 568
 569                 status = state->sink((char *)top_subreq->buf,
 570                                      top_subreq->received, state->priv);
 571                 if (!NT_STATUS_IS_OK(status)) {
 572                         tevent_req_nterror(state->req, status);
 573                         return;
 574                 }
 575                 state->pushed += top_subreq->received;
 576
 577                 TALLOC_FREE(state->reqs[state->top_req].req);
 578
 579                 if (state->requested < state->size) {
 580                         struct tevent_req *new_req;
 581                         SMB_OFF_T size_left;
 582                         size_t request_thistime;
 583
 584                         size_left = state->size - state->requested;
 585                         request_thistime = MIN(size_left, state->chunk_size);
 586
 587                         DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
 588                                    "at %d, position %d\n",
 589                                    (int)request_thistime,
 590                                    (int)(state->start_offset
 591                                          + state->requested),
 592                                    state->top_req));
 593
 594                         new_req = cli_readall_send(
 595                                 state->reqs, state->ev, state->cli,
 596                                 state->fnum,
 597                                 state->start_offset + state->requested,
 598                                 request_thistime);
 599
 600                         if (tevent_req_nomem(new_req, state->req)) {
 601                                 return;
 602                         }
 603                         tevent_req_set_callback(new_req, cli_pull_read_done,
 604                                                 req);
 605
 606                         state->reqs[state->top_req].req = new_req;
 607                         state->requested += request_thistime;
 608                 }
 609
 610                 state->top_req = (state->top_req+1) % state->num_reqs;
 611         }
 612
 613         tevent_req_done(req);
 614 }
 615
 616 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
 617 {
 618         struct cli_pull_state *state = tevent_req_data(
 619                 req, struct cli_pull_state);
 620         NTSTATUS status;
 621
 622         if (tevent_req_is_nterror(req, &status)) {
 623                 return status;
 624         }
 625         *received = state->pushed;
 626         return NT_STATUS_OK;
 627 }
 628
 629 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
 630                   off_t start_offset, SMB_OFF_T size, size_t window_size,
 631                   NTSTATUS (*sink)(char *buf, size_t n, void *priv),
 632                   void *priv, SMB_OFF_T *received)
 633 {
 634         TALLOC_CTX *frame = talloc_stackframe();
 635         struct event_context *ev;
 636         struct tevent_req *req;
 637         NTSTATUS status = NT_STATUS_OK;
 638
 639         if (cli_has_async_calls(cli)) {
 640                 /*
 641                  * Can't use sync call while an async call is in flight
 642                  */
 643                 status = NT_STATUS_INVALID_PARAMETER;
 644                 goto fail;
 645         }
 646
 647         ev = event_context_init(frame);
 648         if (ev == NULL) {
 649                 status = NT_STATUS_NO_MEMORY;
 650                 goto fail;
 651         }
 652
 653         req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
 654                             window_size, sink, priv);
 655         if (req == NULL) {
 656                 status = NT_STATUS_NO_MEMORY;
 657                 goto fail;
 658         }
 659
 660         if (!tevent_req_poll(req, ev)) {
 661                 status = map_nt_error_from_unix(errno);
 662                 goto fail;
 663         }
 664
 665         status = cli_pull_recv(req, received);
 666  fail:
 667         TALLOC_FREE(frame);
 668         if (!NT_STATUS_IS_OK(status)) {
 669                 cli_set_error(cli, status);
 670         }
 671         return status;
 672 }
 673
 674 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
 675 {
 676         char **pbuf = (char **)priv;
 677         memcpy(*pbuf, buf, n);
 678         *pbuf += n;
 679         return NT_STATUS_OK;
 680 }
 681
 682 ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
 683                  off_t offset, size_t size)
 684 {
 685         NTSTATUS status;
 686         SMB_OFF_T ret;
 687
 688         status = cli_pull(cli, fnum, offset, size, size,
 689                           cli_read_sink, &buf, &ret);
 690         if (!NT_STATUS_IS_OK(status)) {
 691                 cli_set_error(cli, status);
 692                 return -1;
 693         }
 694         return ret;
 695 }
 696
 697 /****************************************************************************
 698  Issue a single SMBwrite and don't wait for a reply.
 699 ****************************************************************************/
 700
 701 static bool cli_issue_write(struct cli_state *cli,
 702                                 uint16_t fnum,
 703                                 off_t offset,
 704                                 uint16 mode,
 705                                 const char *buf,
 706                                 size_t size)
 707 {
 708         char *p;
 709         bool large_writex = false;
 710         /* We can only do direct writes if not signing and not encrypting. */
 711         bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
 712
 713         if (!direct_writes && size + 1 > cli->bufsize) {
 714                 cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
 715                 if (!cli->outbuf) {
 716                         return False;
 717                 }
 718                 cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
 719                 if (cli->inbuf == NULL) {
 720                         SAFE_FREE(cli->outbuf);
 721                         return False;
 722                 }
 723                 cli->bufsize = size + 1024;
 724         }
 725
 726         memset(cli->outbuf,'\0',smb_size);
 727         memset(cli->inbuf,'\0',smb_size);
 728
 729         if (cli->capabilities & CAP_LARGE_FILES) {
 730                 large_writex = True;
 731         }
 732
 733         if (large_writex) {
 734                 cli_set_message(cli->outbuf,14,0,True);
 735         } else {
 736                 cli_set_message(cli->outbuf,12,0,True);
 737         }
 738
 739         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 740         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 741         cli_setup_packet(cli);
 742
 743         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 744         SSVAL(cli->outbuf,smb_vwv2,fnum);
 745
 746         SIVAL(cli->outbuf,smb_vwv3,offset);
 747         SIVAL(cli->outbuf,smb_vwv5,0);
 748         SSVAL(cli->outbuf,smb_vwv7,mode);
 749
 750         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 751         /*
 752          * According to CIFS-TR-1p00, this following field should only
 753          * be set if CAP_LARGE_WRITEX is set. We should check this
 754          * locally. However, this check might already have been
 755          * done by our callers.
 756          */
 757         SSVAL(cli->outbuf,smb_vwv9,(size>>16));
 758         SSVAL(cli->outbuf,smb_vwv10,size);
 759         /* +1 is pad byte. */
 760         SSVAL(cli->outbuf,smb_vwv11,
 761               smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
 762
 763         if (large_writex) {
 764                 SIVAL(cli->outbuf,smb_vwv12,(((uint64_t)offset)>>32) & 0xffffffff);
 765         }
 766
 767         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
 768         *p++ = '\0'; /* pad byte. */
 769         if (!direct_writes) {
 770                 memcpy(p, buf, size);
 771         }
 772         if (size > 0x1FFFF) {
 773                 /* This is a POSIX 14 word large write. */
 774                 set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
 775                 _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
 776         } else {
 777                 cli_setup_bcc(cli, p+size);
 778         }
 779
 780         show_msg(cli->outbuf);
 781         if (direct_writes) {
 782                 /* For direct writes we now need to write the data
 783                  * directly out of buf. */
 784                 return cli_send_smb_direct_writeX(cli, buf, size);
 785         } else {
 786                 return cli_send_smb(cli);
 787         }
 788 }
 789
 790 /****************************************************************************
 791   write to a file
 792   write_mode: 0x0001 disallow write cacheing
 793               0x0002 return bytes remaining
 794               0x0004 use raw named pipe protocol
 795               0x0008 start of message mode named pipe protocol
 796 ****************************************************************************/
 797
 798 ssize_t cli_write(struct cli_state *cli,
 799                  uint16_t fnum, uint16 write_mode,
 800                  const char *buf, off_t offset, size_t size)
 801 {
 802         ssize_t bwritten = 0;
 803         unsigned int issued = 0;
 804         unsigned int received = 0;
 805         int mpx = 1;
 806         size_t writesize;
 807         int blocks;
 808
 809         if(cli->max_mux > 1) {
 810                 mpx = cli->max_mux-1;
 811         } else {
 812                 mpx = 1;
 813         }
 814
 815         writesize = cli_write_max_bufsize(cli, write_mode);
 816
 817         blocks = (size + (writesize-1)) / writesize;
 818
 819         while (received < blocks) {
 820
 821                 while ((issued - received < mpx) && (issued < blocks)) {
 822                         ssize_t bsent = issued * writesize;
 823                         ssize_t size1 = MIN(writesize, size - bsent);
 824
 825                         if (!cli_issue_write(cli, fnum, offset + bsent,
 826                                         write_mode,
 827                                         buf + bsent,
 828                                         size1))
 829                                 return -1;
 830                         issued++;
 831                 }
 832
 833                 if (!cli_receive_smb(cli)) {
 834                         return bwritten;
 835                 }
 836
 837                 received++;
 838
 839                 if (cli_is_error(cli))
 840                         break;
 841
 842                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 843                 if (writesize > 0xFFFF) {
 844                         bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
 845                 }
 846         }
 847
 848         while (received < issued && cli_receive_smb(cli)) {
 849                 received++;
 850         }
 851
 852         return bwritten;
 853 }
 854
 855 /****************************************************************************
 856   write to a file using a SMBwrite and not bypassing 0 byte writes
 857 ****************************************************************************/
 858
 859 NTSTATUS cli_smbwrite(struct cli_state *cli, uint16_t fnum, char *buf,
 860                       off_t offset, size_t size1, size_t *ptotal)
 861 {
 862         uint8_t *bytes;
 863         ssize_t total = 0;
 864
 865         /*
 866          * 3 bytes prefix
 867          */
 868
 869         bytes = TALLOC_ARRAY(talloc_tos(), uint8_t, 3);
 870         if (bytes == NULL) {
 871                 return NT_STATUS_NO_MEMORY;
 872         }
 873         bytes[0] = 1;
 874
 875         do {
 876                 size_t size = MIN(size1, cli->max_xmit - 48);
 877                 struct tevent_req *req;
 878                 uint16_t vwv[5];
 879                 uint16_t *ret_vwv;
 880                 NTSTATUS status;
 881
 882                 SSVAL(vwv+0, 0, fnum);
 883                 SSVAL(vwv+1, 0, size);
 884                 SIVAL(vwv+2, 0, offset);
 885                 SSVAL(vwv+4, 0, 0);
 886
 887                 bytes = TALLOC_REALLOC_ARRAY(talloc_tos(), bytes, uint8_t,
 888                                              size+3);
 889                 if (bytes == NULL) {
 890                         return NT_STATUS_NO_MEMORY;
 891                 }
 892                 SSVAL(bytes, 1, size);
 893                 memcpy(bytes + 3, buf + total, size);
 894
 895                 status = cli_smb(talloc_tos(), cli, SMBwrite, 0, 5, vwv,
 896                                  size+3, bytes, &req, 1, NULL, &ret_vwv,
 897                                  NULL, NULL);
 898                 if (!NT_STATUS_IS_OK(status)) {
 899                         TALLOC_FREE(bytes);
 900                         return status;
 901                 }
 902
 903                 size = SVAL(ret_vwv+0, 0);
 904                 TALLOC_FREE(req);
 905                 if (size == 0) {
 906                         break;
 907                 }
 908                 size1 -= size;
 909                 total += size;
 910                 offset += size;
 911
 912         } while (size1);
 913
 914         TALLOC_FREE(bytes);
 915
 916         if (ptotal != NULL) {
 917                 *ptotal = total;
 918         }
 919         return NT_STATUS_OK;
 920 }
 921
 922 /*
 923  * Send a write&x request
 924  */
 925
 926 struct cli_write_andx_state {
 927         size_t size;
 928         uint16_t vwv[14];
 929         size_t written;
 930         uint8_t pad;
 931         struct iovec iov[2];
 932 };
 933
 934 static void cli_write_andx_done(struct tevent_req *subreq);
 935
 936 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
 937                                          struct event_context *ev,
 938                                          struct cli_state *cli, uint16_t fnum,
 939                                          uint16_t mode, const uint8_t *buf,
 940                                          off_t offset, size_t size,
 941                                          struct tevent_req **reqs_before,
 942                                          int num_reqs_before,
 943                                          struct tevent_req **psmbreq)
 944 {
 945         struct tevent_req *req, *subreq;
 946         struct cli_write_andx_state *state;
 947         bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
 948         uint8_t wct = bigoffset ? 14 : 12;
 949         size_t max_write = cli_write_max_bufsize(cli, mode);
 950         uint16_t *vwv;
 951
 952         req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
 953         if (req == NULL) {
 954                 return NULL;
 955         }
 956
 957         size = MIN(size, max_write);
 958
 959         vwv = state->vwv;
 960
 961         SCVAL(vwv+0, 0, 0xFF);
 962         SCVAL(vwv+0, 1, 0);
 963         SSVAL(vwv+1, 0, 0);
 964         SSVAL(vwv+2, 0, fnum);
 965         SIVAL(vwv+3, 0, offset);
 966         SIVAL(vwv+5, 0, 0);
 967         SSVAL(vwv+7, 0, mode);
 968         SSVAL(vwv+8, 0, 0);
 969         SSVAL(vwv+9, 0, (size>>16));
 970         SSVAL(vwv+10, 0, size);
 971
 972         SSVAL(vwv+11, 0,
 973               cli_smb_wct_ofs(reqs_before, num_reqs_before)
 974               + 1               /* the wct field */
 975               + wct * 2         /* vwv */
 976               + 2               /* num_bytes field */
 977               + 1               /* pad */);
 978
 979         if (bigoffset) {
 980                 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
 981         }
 982
 983         state->pad = 0;
 984         state->iov[0].iov_base = (void *)&state->pad;
 985         state->iov[0].iov_len = 1;
 986         state->iov[1].iov_base = CONST_DISCARD(void *, buf);
 987         state->iov[1].iov_len = size;
 988
 989         subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
 990                                     2, state->iov);
 991         if (tevent_req_nomem(subreq, req)) {
 992                 return tevent_req_post(req, ev);
 993         }
 994         tevent_req_set_callback(subreq, cli_write_andx_done, req);
 995         *psmbreq = subreq;
 996         return req;
 997 }
 998
 999 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
1000                                        struct event_context *ev,
1001                                        struct cli_state *cli, uint16_t fnum,
1002                                        uint16_t mode, const uint8_t *buf,
1003                                        off_t offset, size_t size)
1004 {
1005         struct tevent_req *req, *subreq;
1006         NTSTATUS status;
1007
1008         req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
1009                                     size, NULL, 0, &subreq);
1010         if (req == NULL) {
1011                 return NULL;
1012         }
1013
1014         status = cli_smb_req_send(subreq);
1015         if (!NT_STATUS_IS_OK(status)) {
1016                 tevent_req_nterror(req, status);
1017                 return tevent_req_post(req, ev);
1018         }
1019         return req;
1020 }
1021
1022 static void cli_write_andx_done(struct tevent_req *subreq)
1023 {
1024         struct tevent_req *req = tevent_req_callback_data(
1025                 subreq, struct tevent_req);
1026         struct cli_write_andx_state *state = tevent_req_data(
1027                 req, struct cli_write_andx_state);
1028         uint8_t wct;
1029         uint16_t *vwv;
1030         uint8_t *inbuf;
1031         NTSTATUS status;
1032
1033         status = cli_smb_recv(subreq, state, &inbuf, 6, &wct, &vwv,
1034                               NULL, NULL);
1035         TALLOC_FREE(subreq);
1036         if (NT_STATUS_IS_ERR(status)) {
1037                 tevent_req_nterror(req, status);
1038                 return;
1039         }
1040         state->written = SVAL(vwv+2, 0);
1041         state->written |= SVAL(vwv+4, 0)<<16;
1042         tevent_req_done(req);
1043 }
1044
1045 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
1046 {
1047         struct cli_write_andx_state *state = tevent_req_data(
1048                 req, struct cli_write_andx_state);
1049         NTSTATUS status;
1050
1051         if (tevent_req_is_nterror(req, &status)) {
1052                 return status;
1053         }
1054         *pwritten = state->written;
1055         return NT_STATUS_OK;
1056 }
1057
1058 struct cli_writeall_state {
1059         struct event_context *ev;
1060         struct cli_state *cli;
1061         uint16_t fnum;
1062         uint16_t mode;
1063         const uint8_t *buf;
1064         off_t offset;
1065         size_t size;
1066         size_t written;
1067 };
1068
1069 static void cli_writeall_written(struct tevent_req *req);
1070
1071 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
1072                                             struct event_context *ev,
1073                                             struct cli_state *cli,
1074                                             uint16_t fnum,
1075                                             uint16_t mode,
1076                                             const uint8_t *buf,
1077                                             off_t offset, size_t size)
1078 {
1079         struct tevent_req *req, *subreq;
1080         struct cli_writeall_state *state;
1081
1082         req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
1083         if (req == NULL) {
1084                 return NULL;
1085         }
1086         state->ev = ev;
1087         state->cli = cli;
1088         state->fnum = fnum;
1089         state->mode = mode;
1090         state->buf = buf;
1091         state->offset = offset;
1092         state->size = size;
1093         state->written = 0;
1094
1095         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1096                                      state->mode, state->buf, state->offset,
1097                                      state->size);
1098         if (tevent_req_nomem(subreq, req)) {
1099                 return tevent_req_post(req, ev);
1100         }
1101         tevent_req_set_callback(subreq, cli_writeall_written, req);
1102         return req;
1103 }
1104
1105 static void cli_writeall_written(struct tevent_req *subreq)
1106 {
1107         struct tevent_req *req = tevent_req_callback_data(
1108                 subreq, struct tevent_req);
1109         struct cli_writeall_state *state = tevent_req_data(
1110                 req, struct cli_writeall_state);
1111         NTSTATUS status;
1112         size_t written, to_write;
1113
1114         status = cli_write_andx_recv(subreq, &written);
1115         TALLOC_FREE(subreq);
1116         if (!NT_STATUS_IS_OK(status)) {
1117                 tevent_req_nterror(req, status);
1118                 return;
1119         }
1120
1121         state->written += written;
1122
1123         if (state->written > state->size) {
1124                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
1125                 return;
1126         }
1127
1128         to_write = state->size - state->written;
1129
1130         if (to_write == 0) {
1131                 tevent_req_done(req);
1132                 return;
1133         }
1134
1135         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1136                                      state->mode,
1137                                      state->buf + state->written,
1138                                      state->offset + state->written, to_write);
1139         if (tevent_req_nomem(subreq, req)) {
1140                 return;
1141         }
1142         tevent_req_set_callback(subreq, cli_writeall_written, req);
1143 }
1144
1145 static NTSTATUS cli_writeall_recv(struct tevent_req *req)
1146 {
1147         return tevent_req_simple_recv_ntstatus(req);
1148 }
1149
1150 struct cli_push_write_state {
1151         struct tevent_req *req;/* This is the main request! Not the subreq */
1152         uint32_t idx;
1153         off_t ofs;
1154         uint8_t *buf;
1155         size_t size;
1156 };
1157
1158 struct cli_push_state {
1159         struct event_context *ev;
1160         struct cli_state *cli;
1161         uint16_t fnum;
1162         uint16_t mode;
1163         off_t start_offset;
1164         size_t window_size;
1165
1166         size_t (*source)(uint8_t *buf, size_t n, void *priv);
1167         void *priv;
1168
1169         bool eof;
1170
1171         size_t chunk_size;
1172         off_t next_offset;
1173
1174         /*
1175          * Outstanding requests
1176          */
1177         uint32_t pending;
1178         uint32_t num_reqs;
1179         struct cli_push_write_state **reqs;
1180 };
1181
1182 static void cli_push_written(struct tevent_req *req);
1183
1184 static bool cli_push_write_setup(struct tevent_req *req,
1185                                  struct cli_push_state *state,
1186                                  uint32_t idx)
1187 {
1188         struct cli_push_write_state *substate;
1189         struct tevent_req *subreq;
1190
1191         substate = talloc(state->reqs, struct cli_push_write_state);
1192         if (!substate) {
1193                 return false;
1194         }
1195         substate->req = req;
1196         substate->idx = idx;
1197         substate->ofs = state->next_offset;
1198         substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1199         if (!substate->buf) {
1200                 talloc_free(substate);
1201                 return false;
1202         }
1203         substate->size = state->source(substate->buf,
1204                                        state->chunk_size,
1205                                        state->priv);
1206         if (substate->size == 0) {
1207                 state->eof = true;
1208                 /* nothing to send */
1209                 talloc_free(substate);
1210                 return true;
1211         }
1212
1213         subreq = cli_writeall_send(substate,
1214                                    state->ev, state->cli,
1215                                    state->fnum, state->mode,
1216                                    substate->buf,
1217                                    substate->ofs,
1218                                    substate->size);
1219         if (!subreq) {
1220                 talloc_free(substate);
1221                 return false;
1222         }
1223         tevent_req_set_callback(subreq, cli_push_written, substate);
1224
1225         state->reqs[idx] = substate;
1226         state->pending += 1;
1227         state->next_offset += substate->size;
1228
1229         return true;
1230 }
1231
1232 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1233                                  struct cli_state *cli,
1234                                  uint16_t fnum, uint16_t mode,
1235                                  off_t start_offset, size_t window_size,
1236                                  size_t (*source)(uint8_t *buf, size_t n,
1237                                                   void *priv),
1238                                  void *priv)
1239 {
1240         struct tevent_req *req;
1241         struct cli_push_state *state;
1242         uint32_t i;
1243
1244         req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1245         if (req == NULL) {
1246                 return NULL;
1247         }
1248         state->cli = cli;
1249         state->ev = ev;
1250         state->fnum = fnum;
1251         state->start_offset = start_offset;
1252         state->mode = mode;
1253         state->source = source;
1254         state->priv = priv;
1255         state->eof = false;
1256         state->pending = 0;
1257         state->next_offset = start_offset;
1258
1259         state->chunk_size = cli_write_max_bufsize(cli, mode);
1260
1261         if (window_size == 0) {
1262                 window_size = cli->max_mux * state->chunk_size;
1263         }
1264         state->num_reqs = window_size/state->chunk_size;
1265         if ((window_size % state->chunk_size) > 0) {
1266                 state->num_reqs += 1;
1267         }
1268         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1269         state->num_reqs = MAX(state->num_reqs, 1);
1270
1271         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
1272                                         state->num_reqs);
1273         if (state->reqs == NULL) {
1274                 goto failed;
1275         }
1276
1277         for (i=0; i<state->num_reqs; i++) {
1278                 if (!cli_push_write_setup(req, state, i)) {
1279                         goto failed;
1280                 }
1281
1282                 if (state->eof) {
1283                         break;
1284                 }
1285         }
1286
1287         if (state->pending == 0) {
1288                 tevent_req_done(req);
1289                 return tevent_req_post(req, ev);
1290         }
1291
1292         return req;
1293
1294  failed:
1295         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1296         return tevent_req_post(req, ev);
1297 }
1298
1299 static void cli_push_written(struct tevent_req *subreq)
1300 {
1301         struct cli_push_write_state *substate = tevent_req_callback_data(
1302                 subreq, struct cli_push_write_state);
1303         struct tevent_req *req = substate->req;
1304         struct cli_push_state *state = tevent_req_data(
1305                 req, struct cli_push_state);
1306         NTSTATUS status;
1307         uint32_t idx = substate->idx;
1308
1309         state->reqs[idx] = NULL;
1310         state->pending -= 1;
1311
1312         status = cli_writeall_recv(subreq);
1313         TALLOC_FREE(subreq);
1314         TALLOC_FREE(substate);
1315         if (!NT_STATUS_IS_OK(status)) {
1316                 tevent_req_nterror(req, status);
1317                 return;
1318         }
1319
1320         if (!state->eof) {
1321                 if (!cli_push_write_setup(req, state, idx)) {
1322                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1323                         return;
1324                 }
1325         }
1326
1327         if (state->pending == 0) {
1328                 tevent_req_done(req);
1329                 return;
1330         }
1331 }
1332
1333 NTSTATUS cli_push_recv(struct tevent_req *req)
1334 {
1335         return tevent_req_simple_recv_ntstatus(req);
1336 }
1337
1338 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1339                   off_t start_offset, size_t window_size,
1340                   size_t (*source)(uint8_t *buf, size_t n, void *priv),
1341                   void *priv)
1342 {
1343         TALLOC_CTX *frame = talloc_stackframe();
1344         struct event_context *ev;
1345         struct tevent_req *req;
1346         NTSTATUS status = NT_STATUS_OK;
1347
1348         if (cli_has_async_calls(cli)) {
1349                 /*
1350                  * Can't use sync call while an async call is in flight
1351                  */
1352                 status = NT_STATUS_INVALID_PARAMETER;
1353                 goto fail;
1354         }
1355
1356         ev = event_context_init(frame);
1357         if (ev == NULL) {
1358                 status = NT_STATUS_NO_MEMORY;
1359                 goto fail;
1360         }
1361
1362         req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1363                             window_size, source, priv);
1364         if (req == NULL) {
1365                 status = NT_STATUS_NO_MEMORY;
1366                 goto fail;
1367         }
1368
1369         if (!tevent_req_poll(req, ev)) {
1370                 status = map_nt_error_from_unix(errno);
1371                 goto fail;
1372         }
1373
1374         status = cli_push_recv(req);
1375  fail:
1376         TALLOC_FREE(frame);
1377         if (!NT_STATUS_IS_OK(status)) {
1378                 cli_set_error(cli, status);
1379         }
1380         return status;
1381 }