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 && (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_pull_subreq {
 234         struct tevent_req *req;
 235         ssize_t received;
 236         uint8_t *buf;
 237 };
 238
 239 /*
 240  * Parallel read support.
 241  *
 242  * cli_pull sends as many read&x requests as the server would allow via
 243  * max_mux at a time. When replies flow back in, the data is written into
 244  * the callback function "sink" in the right order.
 245  */
 246
 247 struct cli_pull_state {
 248         struct tevent_req *req;
 249
 250         struct event_context *ev;
 251         struct cli_state *cli;
 252         uint16_t fnum;
 253         off_t start_offset;
 254         SMB_OFF_T size;
 255
 256         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 257         void *priv;
 258
 259         size_t chunk_size;
 260
 261         /*
 262          * Outstanding requests
 263          */
 264         int num_reqs;
 265         struct cli_pull_subreq *reqs;
 266
 267         /*
 268          * For how many bytes did we send requests already?
 269          */
 270         SMB_OFF_T requested;
 271
 272         /*
 273          * Next request index to push into "sink". This walks around the "req"
 274          * array, taking care that the requests are pushed to "sink" in the
 275          * right order. If necessary (i.e. replies don't come in in the right
 276          * order), replies are held back in "reqs".
 277          */
 278         int top_req;
 279
 280         /*
 281          * How many bytes did we push into "sink"?
 282          */
 283
 284         SMB_OFF_T pushed;
 285 };
 286
 287 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
 288 {
 289         struct cli_pull_state *state = tevent_req_data(
 290                 req, struct cli_pull_state);
 291         char *result;
 292
 293         result = tevent_req_print(mem_ctx, req);
 294         if (result == NULL) {
 295                 return NULL;
 296         }
 297
 298         return talloc_asprintf_append_buffer(
 299                 result, "num_reqs=%d, top_req=%d",
 300                 state->num_reqs, state->top_req);
 301 }
 302
 303 static void cli_pull_read_done(struct tevent_req *read_req);
 304
 305 /*
 306  * Prepare an async pull request
 307  */
 308
 309 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 310                                  struct event_context *ev,
 311                                  struct cli_state *cli,
 312                                  uint16_t fnum, off_t start_offset,
 313                                  SMB_OFF_T size, size_t window_size,
 314                                  NTSTATUS (*sink)(char *buf, size_t n,
 315                                                   void *priv),
 316                                  void *priv)
 317 {
 318         struct tevent_req *req;
 319         struct cli_pull_state *state;
 320         int i;
 321
 322         req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
 323         if (req == NULL) {
 324                 return NULL;
 325         }
 326         tevent_req_set_print_fn(req, cli_pull_print);
 327         state->req = req;
 328
 329         state->cli = cli;
 330         state->ev = ev;
 331         state->fnum = fnum;
 332         state->start_offset = start_offset;
 333         state->size = size;
 334         state->sink = sink;
 335         state->priv = priv;
 336
 337         state->pushed = 0;
 338         state->top_req = 0;
 339
 340         if (size == 0) {
 341                 tevent_req_done(req);
 342                 return tevent_req_post(req, ev);
 343         }
 344
 345         state->chunk_size = cli_read_max_bufsize(cli);
 346
 347         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 348         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 349
 350         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
 351                                         state->num_reqs);
 352         if (state->reqs == NULL) {
 353                 goto failed;
 354         }
 355
 356         state->requested = 0;
 357
 358         for (i=0; i<state->num_reqs; i++) {
 359                 struct cli_pull_subreq *subreq = &state->reqs[i];
 360                 SMB_OFF_T size_left;
 361                 size_t request_thistime;
 362
 363                 if (state->requested >= size) {
 364                         state->num_reqs = i;
 365                         break;
 366                 }
 367
 368                 size_left = size - state->requested;
 369                 request_thistime = MIN(size_left, state->chunk_size);
 370
 371                 subreq->req = cli_read_andx_send(
 372                         state->reqs, ev, cli, fnum,
 373                         state->start_offset + state->requested,
 374                         request_thistime);
 375
 376                 if (subreq->req == NULL) {
 377                         goto failed;
 378                 }
 379                 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
 380                 state->requested += request_thistime;
 381         }
 382         return req;
 383
 384 failed:
 385         TALLOC_FREE(req);
 386         return NULL;
 387 }
 388
 389 /*
 390  * Handle incoming read replies, push the data into sink and send out new
 391  * requests if necessary.
 392  */
 393
 394 static void cli_pull_read_done(struct tevent_req *subreq)
 395 {
 396         struct tevent_req *req = tevent_req_callback_data(
 397                 subreq, struct tevent_req);
 398         struct cli_pull_state *state = tevent_req_data(
 399                 req, struct cli_pull_state);
 400         struct cli_pull_subreq *pull_subreq = NULL;
 401         NTSTATUS status;
 402         int i;
 403
 404         for (i = 0; i < state->num_reqs; i++) {
 405                 pull_subreq = &state->reqs[i];
 406                 if (subreq == pull_subreq->req) {
 407                         break;
 408                 }
 409         }
 410         if (i == state->num_reqs) {
 411                 /* Huh -- received something we did not send?? */
 412                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 413                 return;
 414         }
 415
 416         status = cli_read_andx_recv(subreq, &pull_subreq->received,
 417                                     &pull_subreq->buf);
 418         if (!NT_STATUS_IS_OK(status)) {
 419                 tevent_req_nterror(state->req, status);
 420                 return;
 421         }
 422
 423         /*
 424          * This loop is the one to take care of out-of-order replies. All
 425          * pending requests are in state->reqs, state->reqs[top_req] is the
 426          * one that is to be pushed next. If however a request later than
 427          * top_req is replied to, then we can't push yet. If top_req is
 428          * replied to at a later point then, we need to push all the finished
 429          * requests.
 430          */
 431
 432         while (state->reqs[state->top_req].req != NULL) {
 433                 struct cli_pull_subreq *top_subreq;
 434
 435                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 436                            state->top_req));
 437
 438                 top_subreq = &state->reqs[state->top_req];
 439
 440                 if (tevent_req_is_in_progress(top_subreq->req)) {
 441                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 442                                    "done\n"));
 443                         return;
 444                 }
 445
 446                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 447                            "pushed\n", (int)top_subreq->received,
 448                            (int)state->pushed));
 449
 450                 status = state->sink((char *)top_subreq->buf,
 451                                      top_subreq->received, state->priv);
 452                 if (!NT_STATUS_IS_OK(status)) {
 453                         tevent_req_nterror(state->req, status);
 454                         return;
 455                 }
 456                 state->pushed += top_subreq->received;
 457
 458                 TALLOC_FREE(state->reqs[state->top_req].req);
 459
 460                 if (state->requested < state->size) {
 461                         struct tevent_req *new_req;
 462                         SMB_OFF_T size_left;
 463                         size_t request_thistime;
 464
 465                         size_left = state->size - state->requested;
 466                         request_thistime = MIN(size_left, state->chunk_size);
 467
 468                         DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
 469                                    "at %d, position %d\n",
 470                                    (int)request_thistime,
 471                                    (int)(state->start_offset
 472                                          + state->requested),
 473                                    state->top_req));
 474
 475                         new_req = cli_read_andx_send(
 476                                 state->reqs, state->ev, state->cli,
 477                                 state->fnum,
 478                                 state->start_offset + state->requested,
 479                                 request_thistime);
 480
 481                         if (tevent_req_nomem(new_req, state->req)) {
 482                                 return;
 483                         }
 484                         tevent_req_set_callback(new_req, cli_pull_read_done,
 485                                                 req);
 486
 487                         state->reqs[state->top_req].req = new_req;
 488                         state->requested += request_thistime;
 489                 }
 490
 491                 state->top_req = (state->top_req+1) % state->num_reqs;
 492         }
 493
 494         tevent_req_done(req);
 495 }
 496
 497 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
 498 {
 499         struct cli_pull_state *state = tevent_req_data(
 500                 req, struct cli_pull_state);
 501         NTSTATUS status;
 502
 503         if (tevent_req_is_nterror(req, &status)) {
 504                 return status;
 505         }
 506         *received = state->pushed;
 507         return NT_STATUS_OK;
 508 }
 509
 510 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
 511                   off_t start_offset, SMB_OFF_T size, size_t window_size,
 512                   NTSTATUS (*sink)(char *buf, size_t n, void *priv),
 513                   void *priv, SMB_OFF_T *received)
 514 {
 515         TALLOC_CTX *frame = talloc_stackframe();
 516         struct event_context *ev;
 517         struct tevent_req *req;
 518         NTSTATUS status = NT_STATUS_OK;
 519
 520         if (cli_has_async_calls(cli)) {
 521                 /*
 522                  * Can't use sync call while an async call is in flight
 523                  */
 524                 status = NT_STATUS_INVALID_PARAMETER;
 525                 goto fail;
 526         }
 527
 528         ev = event_context_init(frame);
 529         if (ev == NULL) {
 530                 status = NT_STATUS_NO_MEMORY;
 531                 goto fail;
 532         }
 533
 534         req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
 535                             window_size, sink, priv);
 536         if (req == NULL) {
 537                 status = NT_STATUS_NO_MEMORY;
 538                 goto fail;
 539         }
 540
 541         if (!tevent_req_poll(req, ev)) {
 542                 status = map_nt_error_from_unix(errno);
 543                 goto fail;
 544         }
 545
 546         status = cli_pull_recv(req, received);
 547  fail:
 548         TALLOC_FREE(frame);
 549         if (!NT_STATUS_IS_OK(status)) {
 550                 cli_set_error(cli, status);
 551         }
 552         return status;
 553 }
 554
 555 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
 556 {
 557         char **pbuf = (char **)priv;
 558         memcpy(*pbuf, buf, n);
 559         *pbuf += n;
 560         return NT_STATUS_OK;
 561 }
 562
 563 ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
 564                  off_t offset, size_t size)
 565 {
 566         NTSTATUS status;
 567         SMB_OFF_T ret;
 568
 569         status = cli_pull(cli, fnum, offset, size, size,
 570                           cli_read_sink, &buf, &ret);
 571         if (!NT_STATUS_IS_OK(status)) {
 572                 cli_set_error(cli, status);
 573                 return -1;
 574         }
 575         return ret;
 576 }
 577
 578 /****************************************************************************
 579  Issue a single SMBwrite and don't wait for a reply.
 580 ****************************************************************************/
 581
 582 static bool cli_issue_write(struct cli_state *cli,
 583                                 uint16_t fnum,
 584                                 off_t offset,
 585                                 uint16 mode,
 586                                 const char *buf,
 587                                 size_t size,
 588                                 int i)
 589 {
 590         char *p;
 591         bool large_writex = false;
 592         /* We can only do direct writes if not signing and not encrypting. */
 593         bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
 594
 595         if (!direct_writes && size + 1 > cli->bufsize) {
 596                 cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
 597                 if (!cli->outbuf) {
 598                         return False;
 599                 }
 600                 cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
 601                 if (cli->inbuf == NULL) {
 602                         SAFE_FREE(cli->outbuf);
 603                         return False;
 604                 }
 605                 cli->bufsize = size + 1024;
 606         }
 607
 608         memset(cli->outbuf,'\0',smb_size);
 609         memset(cli->inbuf,'\0',smb_size);
 610
 611         if (cli->capabilities & CAP_LARGE_FILES) {
 612                 large_writex = True;
 613         }
 614
 615         if (large_writex) {
 616                 cli_set_message(cli->outbuf,14,0,True);
 617         } else {
 618                 cli_set_message(cli->outbuf,12,0,True);
 619         }
 620
 621         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 622         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 623         cli_setup_packet(cli);
 624
 625         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 626         SSVAL(cli->outbuf,smb_vwv2,fnum);
 627
 628         SIVAL(cli->outbuf,smb_vwv3,offset);
 629         SIVAL(cli->outbuf,smb_vwv5,0);
 630         SSVAL(cli->outbuf,smb_vwv7,mode);
 631
 632         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 633         /*
 634          * According to CIFS-TR-1p00, this following field should only
 635          * be set if CAP_LARGE_WRITEX is set. We should check this
 636          * locally. However, this check might already have been
 637          * done by our callers.
 638          */
 639         SSVAL(cli->outbuf,smb_vwv9,(size>>16));
 640         SSVAL(cli->outbuf,smb_vwv10,size);
 641         /* +1 is pad byte. */
 642         SSVAL(cli->outbuf,smb_vwv11,
 643               smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
 644
 645         if (large_writex) {
 646                 SIVAL(cli->outbuf,smb_vwv12,(((uint64_t)offset)>>32) & 0xffffffff);
 647         }
 648
 649         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
 650         *p++ = '\0'; /* pad byte. */
 651         if (!direct_writes) {
 652                 memcpy(p, buf, size);
 653         }
 654         if (size > 0x1FFFF) {
 655                 /* This is a POSIX 14 word large write. */
 656                 set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
 657                 _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
 658         } else {
 659                 cli_setup_bcc(cli, p+size);
 660         }
 661
 662         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 663
 664         show_msg(cli->outbuf);
 665         if (direct_writes) {
 666                 /* For direct writes we now need to write the data
 667                  * directly out of buf. */
 668                 return cli_send_smb_direct_writeX(cli, buf, size);
 669         } else {
 670                 return cli_send_smb(cli);
 671         }
 672 }
 673
 674 /****************************************************************************
 675   write to a file
 676   write_mode: 0x0001 disallow write cacheing
 677               0x0002 return bytes remaining
 678               0x0004 use raw named pipe protocol
 679               0x0008 start of message mode named pipe protocol
 680 ****************************************************************************/
 681
 682 ssize_t cli_write(struct cli_state *cli,
 683                  uint16_t fnum, uint16 write_mode,
 684                  const char *buf, off_t offset, size_t size)
 685 {
 686         ssize_t bwritten = 0;
 687         unsigned int issued = 0;
 688         unsigned int received = 0;
 689         int mpx = 1;
 690         size_t writesize;
 691         int blocks;
 692
 693         if(cli->max_mux > 1) {
 694                 mpx = cli->max_mux-1;
 695         } else {
 696                 mpx = 1;
 697         }
 698
 699         writesize = cli_write_max_bufsize(cli, write_mode);
 700
 701         blocks = (size + (writesize-1)) / writesize;
 702
 703         while (received < blocks) {
 704
 705                 while ((issued - received < mpx) && (issued < blocks)) {
 706                         ssize_t bsent = issued * writesize;
 707                         ssize_t size1 = MIN(writesize, size - bsent);
 708
 709                         if (!cli_issue_write(cli, fnum, offset + bsent,
 710                                         write_mode,
 711                                         buf + bsent,
 712                                         size1, issued))
 713                                 return -1;
 714                         issued++;
 715                 }
 716
 717                 if (!cli_receive_smb(cli)) {
 718                         return bwritten;
 719                 }
 720
 721                 received++;
 722
 723                 if (cli_is_error(cli))
 724                         break;
 725
 726                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 727                 if (writesize > 0xFFFF) {
 728                         bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
 729                 }
 730         }
 731
 732         while (received < issued && cli_receive_smb(cli)) {
 733                 received++;
 734         }
 735
 736         return bwritten;
 737 }
 738
 739 /****************************************************************************
 740   write to a file using a SMBwrite and not bypassing 0 byte writes
 741 ****************************************************************************/
 742
 743 ssize_t cli_smbwrite(struct cli_state *cli,
 744                      uint16_t fnum, char *buf, off_t offset, size_t size1)
 745 {
 746         char *p;
 747         ssize_t total = 0;
 748
 749         do {
 750                 size_t size = MIN(size1, cli->max_xmit - 48);
 751
 752                 memset(cli->outbuf,'\0',smb_size);
 753                 memset(cli->inbuf,'\0',smb_size);
 754
 755                 cli_set_message(cli->outbuf,5, 0,True);
 756
 757                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 758                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 759                 cli_setup_packet(cli);
 760
 761                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 762                 SSVAL(cli->outbuf,smb_vwv1,size);
 763                 SIVAL(cli->outbuf,smb_vwv2,offset);
 764                 SSVAL(cli->outbuf,smb_vwv4,0);
 765
 766                 p = smb_buf(cli->outbuf);
 767                 *p++ = 1;
 768                 SSVAL(p, 0, size); p += 2;
 769                 memcpy(p, buf + total, size); p += size;
 770
 771                 cli_setup_bcc(cli, p);
 772
 773                 if (!cli_send_smb(cli))
 774                         return -1;
 775
 776                 if (!cli_receive_smb(cli))
 777                         return -1;
 778
 779                 if (cli_is_error(cli))
 780                         return -1;
 781
 782                 size = SVAL(cli->inbuf,smb_vwv0);
 783                 if (size == 0)
 784                         break;
 785
 786                 size1 -= size;
 787                 total += size;
 788                 offset += size;
 789
 790         } while (size1);
 791
 792         return total;
 793 }
 794
 795 /*
 796  * Send a write&x request
 797  */
 798
 799 struct cli_write_andx_state {
 800         size_t size;
 801         uint16_t vwv[14];
 802         size_t written;
 803         uint8_t pad;
 804         struct iovec iov[2];
 805 };
 806
 807 static void cli_write_andx_done(struct tevent_req *subreq);
 808
 809 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
 810                                          struct event_context *ev,
 811                                          struct cli_state *cli, uint16_t fnum,
 812                                          uint16_t mode, const uint8_t *buf,
 813                                          off_t offset, size_t size,
 814                                          struct tevent_req **reqs_before,
 815                                          int num_reqs_before,
 816                                          struct tevent_req **psmbreq)
 817 {
 818         struct tevent_req *req, *subreq;
 819         struct cli_write_andx_state *state;
 820         bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
 821         uint8_t wct = bigoffset ? 14 : 12;
 822         size_t max_write = cli_write_max_bufsize(cli, mode);
 823         uint16_t *vwv;
 824
 825         req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
 826         if (req == NULL) {
 827                 return NULL;
 828         }
 829
 830         size = MIN(size, max_write);
 831
 832         vwv = state->vwv;
 833
 834         SCVAL(vwv+0, 0, 0xFF);
 835         SCVAL(vwv+0, 1, 0);
 836         SSVAL(vwv+1, 0, 0);
 837         SSVAL(vwv+2, 0, fnum);
 838         SIVAL(vwv+3, 0, offset);
 839         SIVAL(vwv+5, 0, 0);
 840         SSVAL(vwv+7, 0, mode);
 841         SSVAL(vwv+8, 0, 0);
 842         SSVAL(vwv+9, 0, (size>>16));
 843         SSVAL(vwv+10, 0, size);
 844
 845         SSVAL(vwv+11, 0,
 846               cli_smb_wct_ofs(reqs_before, num_reqs_before)
 847               + 1               /* the wct field */
 848               + wct * 2         /* vwv */
 849               + 2               /* num_bytes field */
 850               + 1               /* pad */);
 851
 852         if (bigoffset) {
 853                 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
 854         }
 855
 856         state->pad = 0;
 857         state->iov[0].iov_base = (void *)&state->pad;
 858         state->iov[0].iov_len = 1;
 859         state->iov[1].iov_base = CONST_DISCARD(void *, buf);
 860         state->iov[1].iov_len = size;
 861
 862         subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
 863                                     2, state->iov);
 864         if (tevent_req_nomem(subreq, req)) {
 865                 return tevent_req_post(req, ev);
 866         }
 867         tevent_req_set_callback(subreq, cli_write_andx_done, req);
 868         *psmbreq = subreq;
 869         return req;
 870 }
 871
 872 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
 873                                        struct event_context *ev,
 874                                        struct cli_state *cli, uint16_t fnum,
 875                                        uint16_t mode, const uint8_t *buf,
 876                                        off_t offset, size_t size)
 877 {
 878         struct tevent_req *req, *subreq;
 879         NTSTATUS status;
 880
 881         req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
 882                                     size, NULL, 0, &subreq);
 883         if (req == NULL) {
 884                 return NULL;
 885         }
 886
 887         status = cli_smb_req_send(subreq);
 888         if (!NT_STATUS_IS_OK(status)) {
 889                 tevent_req_nterror(req, status);
 890                 return tevent_req_post(req, ev);
 891         }
 892         return req;
 893 }
 894
 895 static void cli_write_andx_done(struct tevent_req *subreq)
 896 {
 897         struct tevent_req *req = tevent_req_callback_data(
 898                 subreq, struct tevent_req);
 899         struct cli_write_andx_state *state = tevent_req_data(
 900                 req, struct cli_write_andx_state);
 901         uint8_t wct;
 902         uint16_t *vwv;
 903         NTSTATUS status;
 904
 905         status = cli_smb_recv(subreq, 6, &wct, &vwv, NULL, NULL);
 906         if (NT_STATUS_IS_ERR(status)) {
 907                 TALLOC_FREE(subreq);
 908                 tevent_req_nterror(req, status);
 909                 return;
 910         }
 911         state->written = SVAL(vwv+2, 0);
 912         state->written |= SVAL(vwv+4, 0)<<16;
 913         tevent_req_done(req);
 914 }
 915
 916 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
 917 {
 918         struct cli_write_andx_state *state = tevent_req_data(
 919                 req, struct cli_write_andx_state);
 920         NTSTATUS status;
 921
 922         if (tevent_req_is_nterror(req, &status)) {
 923                 return status;
 924         }
 925         *pwritten = state->written;
 926         return NT_STATUS_OK;
 927 }
 928
 929 struct cli_writeall_state {
 930         struct event_context *ev;
 931         struct cli_state *cli;
 932         uint16_t fnum;
 933         uint16_t mode;
 934         const uint8_t *buf;
 935         off_t offset;
 936         size_t size;
 937         size_t written;
 938 };
 939
 940 static void cli_writeall_written(struct tevent_req *req);
 941
 942 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
 943                                             struct event_context *ev,
 944                                             struct cli_state *cli,
 945                                             uint16_t fnum,
 946                                             uint16_t mode,
 947                                             const uint8_t *buf,
 948                                             off_t offset, size_t size)
 949 {
 950         struct tevent_req *req, *subreq;
 951         struct cli_writeall_state *state;
 952
 953         req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
 954         if (req == NULL) {
 955                 return NULL;
 956         }
 957         state->ev = ev;
 958         state->cli = cli;
 959         state->fnum = fnum;
 960         state->mode = mode;
 961         state->buf = buf;
 962         state->offset = offset;
 963         state->size = size;
 964         state->written = 0;
 965
 966         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 967                                      state->mode, state->buf, state->offset,
 968                                      state->size);
 969         if (tevent_req_nomem(subreq, req)) {
 970                 return tevent_req_post(req, ev);
 971         }
 972         tevent_req_set_callback(subreq, cli_writeall_written, req);
 973         return req;
 974 }
 975
 976 static void cli_writeall_written(struct tevent_req *subreq)
 977 {
 978         struct tevent_req *req = tevent_req_callback_data(
 979                 subreq, struct tevent_req);
 980         struct cli_writeall_state *state = tevent_req_data(
 981                 req, struct cli_writeall_state);
 982         NTSTATUS status;
 983         size_t written, to_write;
 984
 985         status = cli_write_andx_recv(subreq, &written);
 986         TALLOC_FREE(subreq);
 987         if (!NT_STATUS_IS_OK(status)) {
 988                 tevent_req_nterror(req, status);
 989                 return;
 990         }
 991
 992         state->written += written;
 993
 994         if (state->written > state->size) {
 995                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 996                 return;
 997         }
 998
 999         to_write = state->size - state->written;
1000
1001         if (to_write == 0) {
1002                 tevent_req_done(req);
1003                 return;
1004         }
1005
1006         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1007                                      state->mode,
1008                                      state->buf + state->written,
1009                                      state->offset + state->written, to_write);
1010         if (tevent_req_nomem(subreq, req)) {
1011                 return;
1012         }
1013         tevent_req_set_callback(subreq, cli_writeall_written, req);
1014 }
1015
1016 static NTSTATUS cli_writeall_recv(struct tevent_req *req)
1017 {
1018         return tevent_req_simple_recv_ntstatus(req);
1019 }
1020
1021 struct cli_push_write_state {
1022         struct tevent_req *req;/* This is the main request! Not the subreq */
1023         uint32_t idx;
1024         off_t ofs;
1025         uint8_t *buf;
1026         size_t size;
1027 };
1028
1029 struct cli_push_state {
1030         struct event_context *ev;
1031         struct cli_state *cli;
1032         uint16_t fnum;
1033         uint16_t mode;
1034         off_t start_offset;
1035         size_t window_size;
1036
1037         size_t (*source)(uint8_t *buf, size_t n, void *priv);
1038         void *priv;
1039
1040         bool eof;
1041
1042         size_t chunk_size;
1043         off_t next_offset;
1044
1045         /*
1046          * Outstanding requests
1047          */
1048         uint32_t pending;
1049         uint32_t num_reqs;
1050         struct cli_push_write_state **reqs;
1051 };
1052
1053 static void cli_push_written(struct tevent_req *req);
1054
1055 static bool cli_push_write_setup(struct tevent_req *req,
1056                                  struct cli_push_state *state,
1057                                  uint32_t idx)
1058 {
1059         struct cli_push_write_state *substate;
1060         struct tevent_req *subreq;
1061
1062         substate = talloc(state->reqs, struct cli_push_write_state);
1063         if (!substate) {
1064                 return false;
1065         }
1066         substate->req = req;
1067         substate->idx = idx;
1068         substate->ofs = state->next_offset;
1069         substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1070         if (!substate->buf) {
1071                 talloc_free(substate);
1072                 return false;
1073         }
1074         substate->size = state->source(substate->buf,
1075                                        state->chunk_size,
1076                                        state->priv);
1077         if (substate->size == 0) {
1078                 state->eof = true;
1079                 /* nothing to send */
1080                 talloc_free(substate);
1081                 return true;
1082         }
1083
1084         subreq = cli_writeall_send(substate,
1085                                    state->ev, state->cli,
1086                                    state->fnum, state->mode,
1087                                    substate->buf,
1088                                    substate->ofs,
1089                                    substate->size);
1090         if (!subreq) {
1091                 talloc_free(substate);
1092                 return false;
1093         }
1094         tevent_req_set_callback(subreq, cli_push_written, substate);
1095
1096         state->reqs[idx] = substate;
1097         state->pending += 1;
1098         state->next_offset += substate->size;
1099
1100         return true;
1101 }
1102
1103 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1104                                  struct cli_state *cli,
1105                                  uint16_t fnum, uint16_t mode,
1106                                  off_t start_offset, size_t window_size,
1107                                  size_t (*source)(uint8_t *buf, size_t n,
1108                                                   void *priv),
1109                                  void *priv)
1110 {
1111         struct tevent_req *req;
1112         struct cli_push_state *state;
1113         uint32_t i;
1114
1115         req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1116         if (req == NULL) {
1117                 return NULL;
1118         }
1119         state->cli = cli;
1120         state->ev = ev;
1121         state->fnum = fnum;
1122         state->start_offset = start_offset;
1123         state->mode = mode;
1124         state->source = source;
1125         state->priv = priv;
1126         state->eof = false;
1127         state->pending = 0;
1128         state->next_offset = start_offset;
1129
1130         state->chunk_size = cli_write_max_bufsize(cli, mode);
1131
1132         if (window_size == 0) {
1133                 window_size = cli->max_mux * state->chunk_size;
1134         }
1135         state->num_reqs = window_size/state->chunk_size;
1136         if ((window_size % state->chunk_size) > 0) {
1137                 state->num_reqs += 1;
1138         }
1139         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1140         state->num_reqs = MAX(state->num_reqs, 1);
1141
1142         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
1143                                         state->num_reqs);
1144         if (state->reqs == NULL) {
1145                 goto failed;
1146         }
1147
1148         for (i=0; i<state->num_reqs; i++) {
1149                 if (!cli_push_write_setup(req, state, i)) {
1150                         goto failed;
1151                 }
1152
1153                 if (state->eof) {
1154                         break;
1155                 }
1156         }
1157
1158         if (state->pending == 0) {
1159                 tevent_req_done(req);
1160                 return tevent_req_post(req, ev);
1161         }
1162
1163         return req;
1164
1165  failed:
1166         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1167         return tevent_req_post(req, ev);
1168 }
1169
1170 static void cli_push_written(struct tevent_req *subreq)
1171 {
1172         struct cli_push_write_state *substate = tevent_req_callback_data(
1173                 subreq, struct cli_push_write_state);
1174         struct tevent_req *req = substate->req;
1175         struct cli_push_state *state = tevent_req_data(
1176                 req, struct cli_push_state);
1177         NTSTATUS status;
1178         uint32_t idx = substate->idx;
1179
1180         state->reqs[idx] = NULL;
1181         state->pending -= 1;
1182
1183         status = cli_writeall_recv(subreq);
1184         TALLOC_FREE(subreq);
1185         TALLOC_FREE(substate);
1186         if (!NT_STATUS_IS_OK(status)) {
1187                 tevent_req_nterror(req, status);
1188                 return;
1189         }
1190
1191         if (!state->eof) {
1192                 if (!cli_push_write_setup(req, state, idx)) {
1193                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1194                         return;
1195                 }
1196         }
1197
1198         if (state->pending == 0) {
1199                 tevent_req_done(req);
1200                 return;
1201         }
1202 }
1203
1204 NTSTATUS cli_push_recv(struct tevent_req *req)
1205 {
1206         return tevent_req_simple_recv_ntstatus(req);
1207 }
1208
1209 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1210                   off_t start_offset, size_t window_size,
1211                   size_t (*source)(uint8_t *buf, size_t n, void *priv),
1212                   void *priv)
1213 {
1214         TALLOC_CTX *frame = talloc_stackframe();
1215         struct event_context *ev;
1216         struct tevent_req *req;
1217         NTSTATUS status = NT_STATUS_OK;
1218
1219         if (cli_has_async_calls(cli)) {
1220                 /*
1221                  * Can't use sync call while an async call is in flight
1222                  */
1223                 status = NT_STATUS_INVALID_PARAMETER;
1224                 goto fail;
1225         }
1226
1227         ev = event_context_init(frame);
1228         if (ev == NULL) {
1229                 status = NT_STATUS_NO_MEMORY;
1230                 goto fail;
1231         }
1232
1233         req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1234                             window_size, source, priv);
1235         if (req == NULL) {
1236                 status = NT_STATUS_NO_MEMORY;
1237                 goto fail;
1238         }
1239
1240         if (!tevent_req_poll(req, ev)) {
1241                 status = map_nt_error_from_unix(errno);
1242                 goto fail;
1243         }
1244
1245         status = cli_push_recv(req);
1246  fail:
1247         TALLOC_FREE(frame);
1248         if (!NT_STATUS_IS_OK(status)) {
1249                 cli_set_error(cli, status);
1250         }
1251         return status;
1252 }