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