source3/libsmb/clireadwrite.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client file read/write routines
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "../lib/util/tevent_ntstatus.h"
  22 #include "async_smb.h"
  23 #include "trans2.h"
  24
  25 /****************************************************************************
  26   Calculate the recommended read buffer size
  27 ****************************************************************************/
  28 static size_t cli_read_max_bufsize(struct cli_state *cli)
  29 {
  30         if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
  31             && (cli->server_posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
  32                 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
  33         }
  34         if (cli->capabilities & CAP_LARGE_READX) {
  35                 return cli->is_samba
  36                         ? CLI_SAMBA_MAX_LARGE_READX_SIZE
  37                         : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
  38         }
  39         return (cli->max_xmit - (smb_size+32)) & ~1023;
  40 }
  41
  42 /****************************************************************************
  43   Calculate the recommended write buffer size
  44 ****************************************************************************/
  45 static size_t cli_write_max_bufsize(struct cli_state *cli, uint16_t write_mode)
  46 {
  47         if (write_mode == 0 &&
  48             !client_is_signing_on(cli) &&
  49             !cli_encryption_on(cli) &&
  50             (cli->server_posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
  51             (cli->capabilities & CAP_LARGE_FILES)) {
  52                 /* Only do massive writes if we can do them direct
  53                  * with no signing or encrypting - not on a pipe. */
  54                 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
  55         }
  56
  57         if (cli->is_samba) {
  58                 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
  59         }
  60
  61         if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
  62             || client_is_signing_on(cli)
  63             || strequal(cli->dev, "LPT1:")) {
  64
  65                 /*
  66                  * Printer devices are restricted to max_xmit writesize in
  67                  * Vista and XPSP3 as are signing connections.
  68                  */
  69
  70                 return (cli->max_xmit - (smb_size+32)) & ~1023;
  71         }
  72
  73         return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
  74 }
  75
  76 struct cli_read_andx_state {
  77         size_t size;
  78         uint16_t vwv[12];
  79         NTSTATUS status;
  80         size_t received;
  81         uint8_t *buf;
  82 };
  83
  84 static void cli_read_andx_done(struct tevent_req *subreq);
  85
  86 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
  87                                         struct event_context *ev,
  88                                         struct cli_state *cli, uint16_t fnum,
  89                                         off_t offset, size_t size,
  90                                         struct tevent_req **psmbreq)
  91 {
  92         struct tevent_req *req, *subreq;
  93         struct cli_read_andx_state *state;
  94         uint8_t wct = 10;
  95
  96         if (size > cli_read_max_bufsize(cli)) {
  97                 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
  98                           "size=%d\n", (int)size,
  99                           (int)cli_read_max_bufsize(cli)));
 100                 return NULL;
 101         }
 102
 103         req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
 104         if (req == NULL) {
 105                 return NULL;
 106         }
 107         state->size = size;
 108
 109         SCVAL(state->vwv + 0, 0, 0xFF);
 110         SCVAL(state->vwv + 0, 1, 0);
 111         SSVAL(state->vwv + 1, 0, 0);
 112         SSVAL(state->vwv + 2, 0, fnum);
 113         SIVAL(state->vwv + 3, 0, offset);
 114         SSVAL(state->vwv + 5, 0, size);
 115         SSVAL(state->vwv + 6, 0, size);
 116         SSVAL(state->vwv + 7, 0, (size >> 16));
 117         SSVAL(state->vwv + 8, 0, 0);
 118         SSVAL(state->vwv + 9, 0, 0);
 119
 120         if ((uint64_t)offset >> 32) {
 121                 SIVAL(state->vwv + 10, 0,
 122                       (((uint64_t)offset)>>32) & 0xffffffff);
 123                 wct += 2;
 124         }
 125
 126         subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
 127                                     state->vwv, 0, NULL);
 128         if (subreq == NULL) {
 129                 TALLOC_FREE(req);
 130                 return NULL;
 131         }
 132         tevent_req_set_callback(subreq, cli_read_andx_done, req);
 133         *psmbreq = subreq;
 134         return req;
 135 }
 136
 137 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
 138                                       struct event_context *ev,
 139                                       struct cli_state *cli, uint16_t fnum,
 140                                       off_t offset, size_t size)
 141 {
 142         struct tevent_req *req, *subreq;
 143         NTSTATUS status;
 144
 145         req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
 146                                    &subreq);
 147         if (req == NULL) {
 148                 return NULL;
 149         }
 150
 151         status = cli_smb_req_send(subreq);
 152         if (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, state, &inbuf, 12, &wct, &vwv,
 171                                      &num_bytes, &bytes);
 172         TALLOC_FREE(subreq);
 173         if (NT_STATUS_IS_ERR(state->status)) {
 174                 tevent_req_nterror(req, state->status);
 175                 return;
 176         }
 177
 178         /* size is the number of bytes the server returned.
 179          * Might be zero. */
 180         state->received = SVAL(vwv + 5, 0);
 181         state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
 182
 183         if (state->received > state->size) {
 184                 DEBUG(5,("server returned more than we wanted!\n"));
 185                 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
 186                 return;
 187         }
 188
 189         /*
 190          * bcc field must be valid for small reads, for large reads the 16-bit
 191          * bcc field can't be correct.
 192          */
 193
 194         if ((state->received < 0xffff) && (state->received > num_bytes)) {
 195                 DEBUG(5, ("server announced more bytes than sent\n"));
 196                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 197                 return;
 198         }
 199
 200         state->buf = discard_const_p(uint8_t, smb_base(inbuf)) + SVAL(vwv+6, 0);
 201
 202         if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
 203             || ((state->received != 0) && (state->buf < bytes))) {
 204                 DEBUG(5, ("server returned invalid read&x data offset\n"));
 205                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 206                 return;
 207         }
 208         tevent_req_done(req);
 209 }
 210
 211 /*
 212  * Pull the data out of a finished async read_and_x request. rcvbuf is
 213  * talloced from the request, so better make sure that you copy it away before
 214  * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
 215  * talloc_move it!
 216  */
 217
 218 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
 219                             uint8_t **rcvbuf)
 220 {
 221         struct cli_read_andx_state *state = tevent_req_data(
 222                 req, struct cli_read_andx_state);
 223         NTSTATUS status;
 224
 225         if (tevent_req_is_nterror(req, &status)) {
 226                 return status;
 227         }
 228         *received = state->received;
 229         *rcvbuf = state->buf;
 230         return NT_STATUS_OK;
 231 }
 232
 233 struct cli_readall_state {
 234         struct tevent_context *ev;
 235         struct cli_state *cli;
 236         uint16_t fnum;
 237         off_t start_offset;
 238         size_t size;
 239         size_t received;
 240         uint8_t *buf;
 241 };
 242
 243 static void cli_readall_done(struct tevent_req *subreq);
 244
 245 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
 246                                            struct event_context *ev,
 247                                            struct cli_state *cli,
 248                                            uint16_t fnum,
 249                                            off_t offset, size_t size)
 250 {
 251         struct tevent_req *req, *subreq;
 252         struct cli_readall_state *state;
 253
 254         req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
 255         if (req == NULL) {
 256                 return NULL;
 257         }
 258         state->ev = ev;
 259         state->cli = cli;
 260         state->fnum = fnum;
 261         state->start_offset = offset;
 262         state->size = size;
 263         state->received = 0;
 264         state->buf = NULL;
 265
 266         subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
 267         if (tevent_req_nomem(subreq, req)) {
 268                 return tevent_req_post(req, ev);
 269         }
 270         tevent_req_set_callback(subreq, cli_readall_done, req);
 271         return req;
 272 }
 273
 274 static void cli_readall_done(struct tevent_req *subreq)
 275 {
 276         struct tevent_req *req = tevent_req_callback_data(
 277                 subreq, struct tevent_req);
 278         struct cli_readall_state *state = tevent_req_data(
 279                 req, struct cli_readall_state);
 280         ssize_t received;
 281         uint8_t *buf;
 282         NTSTATUS status;
 283
 284         status = cli_read_andx_recv(subreq, &received, &buf);
 285         if (tevent_req_nterror(req, status)) {
 286                 return;
 287         }
 288
 289         if (received == 0) {
 290                 /* EOF */
 291                 tevent_req_done(req);
 292                 return;
 293         }
 294
 295         if ((state->received == 0) && (received == state->size)) {
 296                 /* Ideal case: Got it all in one run */
 297                 state->buf = buf;
 298                 state->received += received;
 299                 tevent_req_done(req);
 300                 return;
 301         }
 302
 303         /*
 304          * We got a short read, issue a read for the
 305          * rest. Unfortunately we have to allocate the buffer
 306          * ourselves now, as our caller expects to receive a single
 307          * buffer. cli_read_andx does it from the buffer received from
 308          * the net, but with a short read we have to put it together
 309          * from several reads.
 310          */
 311
 312         if (state->buf == NULL) {
 313                 state->buf = talloc_array(state, uint8_t, state->size);
 314                 if (tevent_req_nomem(state->buf, req)) {
 315                         return;
 316                 }
 317         }
 318         memcpy(state->buf + state->received, buf, received);
 319         state->received += received;
 320
 321         TALLOC_FREE(subreq);
 322
 323         if (state->received >= state->size) {
 324                 tevent_req_done(req);
 325                 return;
 326         }
 327
 328         subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
 329                                     state->start_offset + state->received,
 330                                     state->size - state->received);
 331         if (tevent_req_nomem(subreq, req)) {
 332                 return;
 333         }
 334         tevent_req_set_callback(subreq, cli_readall_done, req);
 335 }
 336
 337 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
 338                                  uint8_t **rcvbuf)
 339 {
 340         struct cli_readall_state *state = tevent_req_data(
 341                 req, struct cli_readall_state);
 342         NTSTATUS status;
 343
 344         if (tevent_req_is_nterror(req, &status)) {
 345                 return status;
 346         }
 347         *received = state->received;
 348         *rcvbuf = state->buf;
 349         return NT_STATUS_OK;
 350 }
 351
 352 struct cli_pull_subreq {
 353         struct tevent_req *req;
 354         ssize_t received;
 355         uint8_t *buf;
 356 };
 357
 358 /*
 359  * Parallel read support.
 360  *
 361  * cli_pull sends as many read&x requests as the server would allow via
 362  * max_mux at a time. When replies flow back in, the data is written into
 363  * the callback function "sink" in the right order.
 364  */
 365
 366 struct cli_pull_state {
 367         struct tevent_req *req;
 368
 369         struct event_context *ev;
 370         struct cli_state *cli;
 371         uint16_t fnum;
 372         off_t start_offset;
 373         SMB_OFF_T size;
 374
 375         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 376         void *priv;
 377
 378         size_t chunk_size;
 379
 380         /*
 381          * Outstanding requests
 382          */
 383         int num_reqs;
 384         struct cli_pull_subreq *reqs;
 385
 386         /*
 387          * For how many bytes did we send requests already?
 388          */
 389         SMB_OFF_T requested;
 390
 391         /*
 392          * Next request index to push into "sink". This walks around the "req"
 393          * array, taking care that the requests are pushed to "sink" in the
 394          * right order. If necessary (i.e. replies don't come in in the right
 395          * order), replies are held back in "reqs".
 396          */
 397         int top_req;
 398
 399         /*
 400          * How many bytes did we push into "sink"?
 401          */
 402
 403         SMB_OFF_T pushed;
 404 };
 405
 406 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
 407 {
 408         struct cli_pull_state *state = tevent_req_data(
 409                 req, struct cli_pull_state);
 410         char *result;
 411
 412         result = tevent_req_default_print(req, mem_ctx);
 413         if (result == NULL) {
 414                 return NULL;
 415         }
 416
 417         return talloc_asprintf_append_buffer(
 418                 result, "num_reqs=%d, top_req=%d",
 419                 state->num_reqs, state->top_req);
 420 }
 421
 422 static void cli_pull_read_done(struct tevent_req *read_req);
 423
 424 /*
 425  * Prepare an async pull request
 426  */
 427
 428 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 429                                  struct event_context *ev,
 430                                  struct cli_state *cli,
 431                                  uint16_t fnum, off_t start_offset,
 432                                  SMB_OFF_T size, size_t window_size,
 433                                  NTSTATUS (*sink)(char *buf, size_t n,
 434                                                   void *priv),
 435                                  void *priv)
 436 {
 437         struct tevent_req *req;
 438         struct cli_pull_state *state;
 439         int i;
 440
 441         req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
 442         if (req == NULL) {
 443                 return NULL;
 444         }
 445         tevent_req_set_print_fn(req, cli_pull_print);
 446         state->req = req;
 447
 448         state->cli = cli;
 449         state->ev = ev;
 450         state->fnum = fnum;
 451         state->start_offset = start_offset;
 452         state->size = size;
 453         state->sink = sink;
 454         state->priv = priv;
 455
 456         state->pushed = 0;
 457         state->top_req = 0;
 458
 459         if (size == 0) {
 460                 tevent_req_done(req);
 461                 return tevent_req_post(req, ev);
 462         }
 463
 464         state->chunk_size = cli_read_max_bufsize(cli);
 465
 466         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 467         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 468
 469         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
 470                                         state->num_reqs);
 471         if (state->reqs == NULL) {
 472                 goto failed;
 473         }
 474
 475         state->requested = 0;
 476
 477         for (i=0; i<state->num_reqs; i++) {
 478                 struct cli_pull_subreq *subreq = &state->reqs[i];
 479                 SMB_OFF_T size_left;
 480                 size_t request_thistime;
 481
 482                 if (state->requested >= size) {
 483                         state->num_reqs = i;
 484                         break;
 485                 }
 486
 487                 size_left = size - state->requested;
 488                 request_thistime = MIN(size_left, state->chunk_size);
 489
 490                 subreq->req = cli_readall_send(
 491                         state->reqs, ev, cli, fnum,
 492                         state->start_offset + state->requested,
 493                         request_thistime);
 494
 495                 if (subreq->req == NULL) {
 496                         goto failed;
 497                 }
 498                 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
 499                 state->requested += request_thistime;
 500         }
 501         return req;
 502
 503 failed:
 504         TALLOC_FREE(req);
 505         return NULL;
 506 }
 507
 508 /*
 509  * Handle incoming read replies, push the data into sink and send out new
 510  * requests if necessary.
 511  */
 512
 513 static void cli_pull_read_done(struct tevent_req *subreq)
 514 {
 515         struct tevent_req *req = tevent_req_callback_data(
 516                 subreq, struct tevent_req);
 517         struct cli_pull_state *state = tevent_req_data(
 518                 req, struct cli_pull_state);
 519         struct cli_pull_subreq *pull_subreq = NULL;
 520         NTSTATUS status;
 521         int i;
 522
 523         for (i = 0; i < state->num_reqs; i++) {
 524                 pull_subreq = &state->reqs[i];
 525                 if (subreq == pull_subreq->req) {
 526                         break;
 527                 }
 528         }
 529         if (i == state->num_reqs) {
 530                 /* Huh -- received something we did not send?? */
 531                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 532                 return;
 533         }
 534
 535         status = cli_readall_recv(subreq, &pull_subreq->received,
 536                                   &pull_subreq->buf);
 537         if (!NT_STATUS_IS_OK(status)) {
 538                 tevent_req_nterror(state->req, status);
 539                 return;
 540         }
 541
 542         /*
 543          * This loop is the one to take care of out-of-order replies. All
 544          * pending requests are in state->reqs, state->reqs[top_req] is the
 545          * one that is to be pushed next. If however a request later than
 546          * top_req is replied to, then we can't push yet. If top_req is
 547          * replied to at a later point then, we need to push all the finished
 548          * requests.
 549          */
 550
 551         while (state->reqs[state->top_req].req != NULL) {
 552                 struct cli_pull_subreq *top_subreq;
 553
 554                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 555                            state->top_req));
 556
 557                 top_subreq = &state->reqs[state->top_req];
 558
 559                 if (tevent_req_is_in_progress(top_subreq->req)) {
 560                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 561                                    "done\n"));
 562                         return;
 563                 }
 564
 565                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 566                            "pushed\n", (int)top_subreq->received,
 567                            (int)state->pushed));
 568
 569                 status = state->sink((char *)top_subreq->buf,
 570                                      top_subreq->received, state->priv);
 571                 if (tevent_req_nterror(state->req, status)) {
 572                         return;
 573                 }
 574                 state->pushed += top_subreq->received;
 575
 576                 TALLOC_FREE(state->reqs[state->top_req].req);
 577
 578                 if (state->requested < state->size) {
 579                         struct tevent_req *new_req;
 580                         SMB_OFF_T size_left;
 581                         size_t request_thistime;
 582
 583                         size_left = state->size - state->requested;
 584                         request_thistime = MIN(size_left, state->chunk_size);
 585
 586                         DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
 587                                    "at %d, position %d\n",
 588                                    (int)request_thistime,
 589                                    (int)(state->start_offset
 590                                          + state->requested),
 591                                    state->top_req));
 592
 593                         new_req = cli_readall_send(
 594                                 state->reqs, state->ev, state->cli,
 595                                 state->fnum,
 596                                 state->start_offset + state->requested,
 597                                 request_thistime);
 598
 599                         if (tevent_req_nomem(new_req, state->req)) {
 600                                 return;
 601                         }
 602                         tevent_req_set_callback(new_req, cli_pull_read_done,
 603                                                 req);
 604
 605                         state->reqs[state->top_req].req = new_req;
 606                         state->requested += request_thistime;
 607                 }
 608
 609                 state->top_req = (state->top_req+1) % state->num_reqs;
 610         }
 611
 612         tevent_req_done(req);
 613 }
 614
 615 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
 616 {
 617         struct cli_pull_state *state = tevent_req_data(
 618                 req, struct cli_pull_state);
 619         NTSTATUS status;
 620
 621         if (tevent_req_is_nterror(req, &status)) {
 622                 return status;
 623         }
 624         *received = state->pushed;
 625         return NT_STATUS_OK;
 626 }
 627
 628 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
 629                   off_t start_offset, SMB_OFF_T size, size_t window_size,
 630                   NTSTATUS (*sink)(char *buf, size_t n, void *priv),
 631                   void *priv, SMB_OFF_T *received)
 632 {
 633         TALLOC_CTX *frame = talloc_stackframe();
 634         struct event_context *ev;
 635         struct tevent_req *req;
 636         NTSTATUS status = NT_STATUS_OK;
 637
 638         if (cli_has_async_calls(cli)) {
 639                 /*
 640                  * Can't use sync call while an async call is in flight
 641                  */
 642                 status = NT_STATUS_INVALID_PARAMETER;
 643                 goto fail;
 644         }
 645
 646         ev = event_context_init(frame);
 647         if (ev == NULL) {
 648                 status = NT_STATUS_NO_MEMORY;
 649                 goto fail;
 650         }
 651
 652         req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
 653                             window_size, sink, priv);
 654         if (req == NULL) {
 655                 status = NT_STATUS_NO_MEMORY;
 656                 goto fail;
 657         }
 658
 659         if (!tevent_req_poll(req, ev)) {
 660                 status = map_nt_error_from_unix(errno);
 661                 goto fail;
 662         }
 663
 664         status = cli_pull_recv(req, received);
 665  fail:
 666         TALLOC_FREE(frame);
 667         if (!NT_STATUS_IS_OK(status)) {
 668                 cli_set_error(cli, status);
 669         }
 670         return status;
 671 }
 672
 673 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
 674 {
 675         char **pbuf = (char **)priv;
 676         memcpy(*pbuf, buf, n);
 677         *pbuf += n;
 678         return NT_STATUS_OK;
 679 }
 680
 681 ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
 682                  off_t offset, size_t size)
 683 {
 684         NTSTATUS status;
 685         SMB_OFF_T ret;
 686
 687         status = cli_pull(cli, fnum, offset, size, size,
 688                           cli_read_sink, &buf, &ret);
 689         if (!NT_STATUS_IS_OK(status)) {
 690                 cli_set_error(cli, status);
 691                 return -1;
 692         }
 693         return ret;
 694 }
 695
 696 /****************************************************************************
 697   write to a file using a SMBwrite and not bypassing 0 byte writes
 698 ****************************************************************************/
 699
 700 NTSTATUS cli_smbwrite(struct cli_state *cli, uint16_t fnum, char *buf,
 701                       off_t offset, size_t size1, size_t *ptotal)
 702 {
 703         uint8_t *bytes;
 704         ssize_t total = 0;
 705
 706         /*
 707          * 3 bytes prefix
 708          */
 709
 710         bytes = TALLOC_ARRAY(talloc_tos(), uint8_t, 3);
 711         if (bytes == NULL) {
 712                 return NT_STATUS_NO_MEMORY;
 713         }
 714         bytes[0] = 1;
 715
 716         do {
 717                 size_t size = MIN(size1, cli->max_xmit - 48);
 718                 struct tevent_req *req;
 719                 uint16_t vwv[5];
 720                 uint16_t *ret_vwv;
 721                 NTSTATUS status;
 722
 723                 SSVAL(vwv+0, 0, fnum);
 724                 SSVAL(vwv+1, 0, size);
 725                 SIVAL(vwv+2, 0, offset);
 726                 SSVAL(vwv+4, 0, 0);
 727
 728                 bytes = TALLOC_REALLOC_ARRAY(talloc_tos(), bytes, uint8_t,
 729                                              size+3);
 730                 if (bytes == NULL) {
 731                         return NT_STATUS_NO_MEMORY;
 732                 }
 733                 SSVAL(bytes, 1, size);
 734                 memcpy(bytes + 3, buf + total, size);
 735
 736                 status = cli_smb(talloc_tos(), cli, SMBwrite, 0, 5, vwv,
 737                                  size+3, bytes, &req, 1, NULL, &ret_vwv,
 738                                  NULL, NULL);
 739                 if (!NT_STATUS_IS_OK(status)) {
 740                         TALLOC_FREE(bytes);
 741                         return status;
 742                 }
 743
 744                 size = SVAL(ret_vwv+0, 0);
 745                 TALLOC_FREE(req);
 746                 if (size == 0) {
 747                         break;
 748                 }
 749                 size1 -= size;
 750                 total += size;
 751                 offset += size;
 752
 753         } while (size1);
 754
 755         TALLOC_FREE(bytes);
 756
 757         if (ptotal != NULL) {
 758                 *ptotal = total;
 759         }
 760         return NT_STATUS_OK;
 761 }
 762
 763 /*
 764  * Send a write&x request
 765  */
 766
 767 struct cli_write_andx_state {
 768         size_t size;
 769         uint16_t vwv[14];
 770         size_t written;
 771         uint8_t pad;
 772         struct iovec iov[2];
 773 };
 774
 775 static void cli_write_andx_done(struct tevent_req *subreq);
 776
 777 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
 778                                          struct event_context *ev,
 779                                          struct cli_state *cli, uint16_t fnum,
 780                                          uint16_t mode, const uint8_t *buf,
 781                                          off_t offset, size_t size,
 782                                          struct tevent_req **reqs_before,
 783                                          int num_reqs_before,
 784                                          struct tevent_req **psmbreq)
 785 {
 786         struct tevent_req *req, *subreq;
 787         struct cli_write_andx_state *state;
 788         bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
 789         uint8_t wct = bigoffset ? 14 : 12;
 790         size_t max_write = cli_write_max_bufsize(cli, mode);
 791         uint16_t *vwv;
 792
 793         req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
 794         if (req == NULL) {
 795                 return NULL;
 796         }
 797
 798         size = MIN(size, max_write);
 799
 800         vwv = state->vwv;
 801
 802         SCVAL(vwv+0, 0, 0xFF);
 803         SCVAL(vwv+0, 1, 0);
 804         SSVAL(vwv+1, 0, 0);
 805         SSVAL(vwv+2, 0, fnum);
 806         SIVAL(vwv+3, 0, offset);
 807         SIVAL(vwv+5, 0, 0);
 808         SSVAL(vwv+7, 0, mode);
 809         SSVAL(vwv+8, 0, 0);
 810         SSVAL(vwv+9, 0, (size>>16));
 811         SSVAL(vwv+10, 0, size);
 812
 813         SSVAL(vwv+11, 0,
 814               cli_smb_wct_ofs(reqs_before, num_reqs_before)
 815               + 1               /* the wct field */
 816               + wct * 2         /* vwv */
 817               + 2               /* num_bytes field */
 818               + 1               /* pad */);
 819
 820         if (bigoffset) {
 821                 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
 822         }
 823
 824         state->pad = 0;
 825         state->iov[0].iov_base = (void *)&state->pad;
 826         state->iov[0].iov_len = 1;
 827         state->iov[1].iov_base = discard_const_p(void, buf);
 828         state->iov[1].iov_len = size;
 829
 830         subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
 831                                     2, state->iov);
 832         if (tevent_req_nomem(subreq, req)) {
 833                 return tevent_req_post(req, ev);
 834         }
 835         tevent_req_set_callback(subreq, cli_write_andx_done, req);
 836         *psmbreq = subreq;
 837         return req;
 838 }
 839
 840 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
 841                                        struct event_context *ev,
 842                                        struct cli_state *cli, uint16_t fnum,
 843                                        uint16_t mode, const uint8_t *buf,
 844                                        off_t offset, size_t size)
 845 {
 846         struct tevent_req *req, *subreq;
 847         NTSTATUS status;
 848
 849         req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
 850                                     size, NULL, 0, &subreq);
 851         if (req == NULL) {
 852                 return NULL;
 853         }
 854
 855         status = cli_smb_req_send(subreq);
 856         if (tevent_req_nterror(req, status)) {
 857                 return tevent_req_post(req, ev);
 858         }
 859         return req;
 860 }
 861
 862 static void cli_write_andx_done(struct tevent_req *subreq)
 863 {
 864         struct tevent_req *req = tevent_req_callback_data(
 865                 subreq, struct tevent_req);
 866         struct cli_write_andx_state *state = tevent_req_data(
 867                 req, struct cli_write_andx_state);
 868         uint8_t wct;
 869         uint16_t *vwv;
 870         uint8_t *inbuf;
 871         NTSTATUS status;
 872
 873         status = cli_smb_recv(subreq, state, &inbuf, 6, &wct, &vwv,
 874                               NULL, NULL);
 875         TALLOC_FREE(subreq);
 876         if (NT_STATUS_IS_ERR(status)) {
 877                 tevent_req_nterror(req, status);
 878                 return;
 879         }
 880         state->written = SVAL(vwv+2, 0);
 881         state->written |= SVAL(vwv+4, 0)<<16;
 882         tevent_req_done(req);
 883 }
 884
 885 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
 886 {
 887         struct cli_write_andx_state *state = tevent_req_data(
 888                 req, struct cli_write_andx_state);
 889         NTSTATUS status;
 890
 891         if (tevent_req_is_nterror(req, &status)) {
 892                 return status;
 893         }
 894         *pwritten = state->written;
 895         return NT_STATUS_OK;
 896 }
 897
 898 struct cli_writeall_state {
 899         struct event_context *ev;
 900         struct cli_state *cli;
 901         uint16_t fnum;
 902         uint16_t mode;
 903         const uint8_t *buf;
 904         off_t offset;
 905         size_t size;
 906         size_t written;
 907 };
 908
 909 static void cli_writeall_written(struct tevent_req *req);
 910
 911 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
 912                                             struct event_context *ev,
 913                                             struct cli_state *cli,
 914                                             uint16_t fnum,
 915                                             uint16_t mode,
 916                                             const uint8_t *buf,
 917                                             off_t offset, size_t size)
 918 {
 919         struct tevent_req *req, *subreq;
 920         struct cli_writeall_state *state;
 921
 922         req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
 923         if (req == NULL) {
 924                 return NULL;
 925         }
 926         state->ev = ev;
 927         state->cli = cli;
 928         state->fnum = fnum;
 929         state->mode = mode;
 930         state->buf = buf;
 931         state->offset = offset;
 932         state->size = size;
 933         state->written = 0;
 934
 935         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 936                                      state->mode, state->buf, state->offset,
 937                                      state->size);
 938         if (tevent_req_nomem(subreq, req)) {
 939                 return tevent_req_post(req, ev);
 940         }
 941         tevent_req_set_callback(subreq, cli_writeall_written, req);
 942         return req;
 943 }
 944
 945 static void cli_writeall_written(struct tevent_req *subreq)
 946 {
 947         struct tevent_req *req = tevent_req_callback_data(
 948                 subreq, struct tevent_req);
 949         struct cli_writeall_state *state = tevent_req_data(
 950                 req, struct cli_writeall_state);
 951         NTSTATUS status;
 952         size_t written, to_write;
 953
 954         status = cli_write_andx_recv(subreq, &written);
 955         TALLOC_FREE(subreq);
 956         if (tevent_req_nterror(req, status)) {
 957                 return;
 958         }
 959
 960         state->written += written;
 961
 962         if (state->written > state->size) {
 963                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 964                 return;
 965         }
 966
 967         to_write = state->size - state->written;
 968
 969         if (to_write == 0) {
 970                 tevent_req_done(req);
 971                 return;
 972         }
 973
 974         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 975                                      state->mode,
 976                                      state->buf + state->written,
 977                                      state->offset + state->written, to_write);
 978         if (tevent_req_nomem(subreq, req)) {
 979                 return;
 980         }
 981         tevent_req_set_callback(subreq, cli_writeall_written, req);
 982 }
 983
 984 static NTSTATUS cli_writeall_recv(struct tevent_req *req,
 985                                   size_t *pwritten)
 986 {
 987         struct cli_writeall_state *state = tevent_req_data(
 988                 req, struct cli_writeall_state);
 989         NTSTATUS status;
 990
 991         if (tevent_req_is_nterror(req, &status)) {
 992                 return status;
 993         }
 994         if (pwritten != NULL) {
 995                 *pwritten = state->written;
 996         }
 997         return NT_STATUS_OK;
 998 }
 999
1000 NTSTATUS cli_writeall(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1001                       const uint8_t *buf, off_t offset, size_t size,
1002                       size_t *pwritten)
1003 {
1004         TALLOC_CTX *frame = talloc_stackframe();
1005         struct event_context *ev;
1006         struct tevent_req *req;
1007         NTSTATUS status = NT_STATUS_NO_MEMORY;
1008
1009         if (cli_has_async_calls(cli)) {
1010                 /*
1011                  * Can't use sync call while an async call is in flight
1012                  */
1013                 status = NT_STATUS_INVALID_PARAMETER;
1014                 goto fail;
1015         }
1016         ev = event_context_init(frame);
1017         if (ev == NULL) {
1018                 goto fail;
1019         }
1020         req = cli_writeall_send(frame, ev, cli, fnum, mode, buf, offset, size);
1021         if (req == NULL) {
1022                 goto fail;
1023         }
1024         if (!tevent_req_poll(req, ev)) {
1025                 status = map_nt_error_from_unix(errno);
1026                 goto fail;
1027         }
1028         status = cli_writeall_recv(req, pwritten);
1029  fail:
1030         TALLOC_FREE(frame);
1031         if (!NT_STATUS_IS_OK(status)) {
1032                 cli_set_error(cli, status);
1033         }
1034         return status;
1035 }
1036
1037 struct cli_push_write_state {
1038         struct tevent_req *req;/* This is the main request! Not the subreq */
1039         uint32_t idx;
1040         off_t ofs;
1041         uint8_t *buf;
1042         size_t size;
1043 };
1044
1045 struct cli_push_state {
1046         struct event_context *ev;
1047         struct cli_state *cli;
1048         uint16_t fnum;
1049         uint16_t mode;
1050         off_t start_offset;
1051         size_t window_size;
1052
1053         size_t (*source)(uint8_t *buf, size_t n, void *priv);
1054         void *priv;
1055
1056         bool eof;
1057
1058         size_t chunk_size;
1059         off_t next_offset;
1060
1061         /*
1062          * Outstanding requests
1063          */
1064         uint32_t pending;
1065         uint32_t num_reqs;
1066         struct cli_push_write_state **reqs;
1067 };
1068
1069 static void cli_push_written(struct tevent_req *req);
1070
1071 static bool cli_push_write_setup(struct tevent_req *req,
1072                                  struct cli_push_state *state,
1073                                  uint32_t idx)
1074 {
1075         struct cli_push_write_state *substate;
1076         struct tevent_req *subreq;
1077
1078         substate = talloc(state->reqs, struct cli_push_write_state);
1079         if (!substate) {
1080                 return false;
1081         }
1082         substate->req = req;
1083         substate->idx = idx;
1084         substate->ofs = state->next_offset;
1085         substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1086         if (!substate->buf) {
1087                 talloc_free(substate);
1088                 return false;
1089         }
1090         substate->size = state->source(substate->buf,
1091                                        state->chunk_size,
1092                                        state->priv);
1093         if (substate->size == 0) {
1094                 state->eof = true;
1095                 /* nothing to send */
1096                 talloc_free(substate);
1097                 return true;
1098         }
1099
1100         subreq = cli_writeall_send(substate,
1101                                    state->ev, state->cli,
1102                                    state->fnum, state->mode,
1103                                    substate->buf,
1104                                    substate->ofs,
1105                                    substate->size);
1106         if (!subreq) {
1107                 talloc_free(substate);
1108                 return false;
1109         }
1110         tevent_req_set_callback(subreq, cli_push_written, substate);
1111
1112         state->reqs[idx] = substate;
1113         state->pending += 1;
1114         state->next_offset += substate->size;
1115
1116         return true;
1117 }
1118
1119 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1120                                  struct cli_state *cli,
1121                                  uint16_t fnum, uint16_t mode,
1122                                  off_t start_offset, size_t window_size,
1123                                  size_t (*source)(uint8_t *buf, size_t n,
1124                                                   void *priv),
1125                                  void *priv)
1126 {
1127         struct tevent_req *req;
1128         struct cli_push_state *state;
1129         uint32_t i;
1130
1131         req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1132         if (req == NULL) {
1133                 return NULL;
1134         }
1135         state->cli = cli;
1136         state->ev = ev;
1137         state->fnum = fnum;
1138         state->start_offset = start_offset;
1139         state->mode = mode;
1140         state->source = source;
1141         state->priv = priv;
1142         state->eof = false;
1143         state->pending = 0;
1144         state->next_offset = start_offset;
1145
1146         state->chunk_size = cli_write_max_bufsize(cli, mode);
1147
1148         if (window_size == 0) {
1149                 window_size = cli->max_mux * state->chunk_size;
1150         }
1151         state->num_reqs = window_size/state->chunk_size;
1152         if ((window_size % state->chunk_size) > 0) {
1153                 state->num_reqs += 1;
1154         }
1155         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1156         state->num_reqs = MAX(state->num_reqs, 1);
1157
1158         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
1159                                         state->num_reqs);
1160         if (state->reqs == NULL) {
1161                 goto failed;
1162         }
1163
1164         for (i=0; i<state->num_reqs; i++) {
1165                 if (!cli_push_write_setup(req, state, i)) {
1166                         goto failed;
1167                 }
1168
1169                 if (state->eof) {
1170                         break;
1171                 }
1172         }
1173
1174         if (state->pending == 0) {
1175                 tevent_req_done(req);
1176                 return tevent_req_post(req, ev);
1177         }
1178
1179         return req;
1180
1181  failed:
1182         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1183         return tevent_req_post(req, ev);
1184 }
1185
1186 static void cli_push_written(struct tevent_req *subreq)
1187 {
1188         struct cli_push_write_state *substate = tevent_req_callback_data(
1189                 subreq, struct cli_push_write_state);
1190         struct tevent_req *req = substate->req;
1191         struct cli_push_state *state = tevent_req_data(
1192                 req, struct cli_push_state);
1193         NTSTATUS status;
1194         uint32_t idx = substate->idx;
1195
1196         state->reqs[idx] = NULL;
1197         state->pending -= 1;
1198
1199         status = cli_writeall_recv(subreq, NULL);
1200         TALLOC_FREE(subreq);
1201         TALLOC_FREE(substate);
1202         if (tevent_req_nterror(req, status)) {
1203                 return;
1204         }
1205
1206         if (!state->eof) {
1207                 if (!cli_push_write_setup(req, state, idx)) {
1208                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1209                         return;
1210                 }
1211         }
1212
1213         if (state->pending == 0) {
1214                 tevent_req_done(req);
1215                 return;
1216         }
1217 }
1218
1219 NTSTATUS cli_push_recv(struct tevent_req *req)
1220 {
1221         return tevent_req_simple_recv_ntstatus(req);
1222 }
1223
1224 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1225                   off_t start_offset, size_t window_size,
1226                   size_t (*source)(uint8_t *buf, size_t n, void *priv),
1227                   void *priv)
1228 {
1229         TALLOC_CTX *frame = talloc_stackframe();
1230         struct event_context *ev;
1231         struct tevent_req *req;
1232         NTSTATUS status = NT_STATUS_OK;
1233
1234         if (cli_has_async_calls(cli)) {
1235                 /*
1236                  * Can't use sync call while an async call is in flight
1237                  */
1238                 status = NT_STATUS_INVALID_PARAMETER;
1239                 goto fail;
1240         }
1241
1242         ev = event_context_init(frame);
1243         if (ev == NULL) {
1244                 status = NT_STATUS_NO_MEMORY;
1245                 goto fail;
1246         }
1247
1248         req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1249                             window_size, source, priv);
1250         if (req == NULL) {
1251                 status = NT_STATUS_NO_MEMORY;
1252                 goto fail;
1253         }
1254
1255         if (!tevent_req_poll(req, ev)) {
1256                 status = map_nt_error_from_unix(errno);
1257                 goto fail;
1258         }
1259
1260         status = cli_push_recv(req);
1261  fail:
1262         TALLOC_FREE(frame);
1263         if (!NT_STATUS_IS_OK(status)) {
1264                 cli_set_error(cli, status);
1265         }
1266         return status;
1267 }