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->server_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->server_posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
  48             (cli->capabilities & CAP_LARGE_FILES)) {
  49                 /* Only do massive writes if we can do them direct
  50                  * with no signing or encrypting - not on a pipe. */
  51                 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
  52         }
  53
  54         if (cli->is_samba) {
  55                 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
  56         }
  57
  58         if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
  59             || client_is_signing_on(cli)
  60             || strequal(cli->dev, "LPT1:")) {
  61
  62                 /*
  63                  * Printer devices are restricted to max_xmit writesize in
  64                  * Vista and XPSP3 as are signing connections.
  65                  */
  66
  67                 return (cli->max_xmit - (smb_size+32)) & ~1023;
  68         }
  69
  70         return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
  71 }
  72
  73 struct cli_read_andx_state {
  74         size_t size;
  75         uint16_t vwv[12];
  76         NTSTATUS status;
  77         size_t received;
  78         uint8_t *buf;
  79 };
  80
  81 static void cli_read_andx_done(struct tevent_req *subreq);
  82
  83 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
  84                                         struct event_context *ev,
  85                                         struct cli_state *cli, uint16_t fnum,
  86                                         off_t offset, size_t size,
  87                                         struct tevent_req **psmbreq)
  88 {
  89         struct tevent_req *req, *subreq;
  90         struct cli_read_andx_state *state;
  91         uint8_t wct = 10;
  92
  93         if (size > cli_read_max_bufsize(cli)) {
  94                 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
  95                           "size=%d\n", (int)size,
  96                           (int)cli_read_max_bufsize(cli)));
  97                 return NULL;
  98         }
  99
 100         req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
 101         if (req == NULL) {
 102                 return NULL;
 103         }
 104         state->size = size;
 105
 106         SCVAL(state->vwv + 0, 0, 0xFF);
 107         SCVAL(state->vwv + 0, 1, 0);
 108         SSVAL(state->vwv + 1, 0, 0);
 109         SSVAL(state->vwv + 2, 0, fnum);
 110         SIVAL(state->vwv + 3, 0, offset);
 111         SSVAL(state->vwv + 5, 0, size);
 112         SSVAL(state->vwv + 6, 0, size);
 113         SSVAL(state->vwv + 7, 0, (size >> 16));
 114         SSVAL(state->vwv + 8, 0, 0);
 115         SSVAL(state->vwv + 9, 0, 0);
 116
 117         if ((uint64_t)offset >> 32) {
 118                 SIVAL(state->vwv + 10, 0,
 119                       (((uint64_t)offset)>>32) & 0xffffffff);
 120                 wct += 2;
 121         }
 122
 123         subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
 124                                     state->vwv, 0, NULL);
 125         if (subreq == NULL) {
 126                 TALLOC_FREE(req);
 127                 return NULL;
 128         }
 129         tevent_req_set_callback(subreq, cli_read_andx_done, req);
 130         *psmbreq = subreq;
 131         return req;
 132 }
 133
 134 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
 135                                       struct event_context *ev,
 136                                       struct cli_state *cli, uint16_t fnum,
 137                                       off_t offset, size_t size)
 138 {
 139         struct tevent_req *req, *subreq;
 140         NTSTATUS status;
 141
 142         req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
 143                                    &subreq);
 144         if (req == NULL) {
 145                 return NULL;
 146         }
 147
 148         status = cli_smb_req_send(subreq);
 149         if (!NT_STATUS_IS_OK(status)) {
 150                 tevent_req_nterror(req, status);
 151                 return tevent_req_post(req, ev);
 152         }
 153         return req;
 154 }
 155
 156 static void cli_read_andx_done(struct tevent_req *subreq)
 157 {
 158         struct tevent_req *req = tevent_req_callback_data(
 159                 subreq, struct tevent_req);
 160         struct cli_read_andx_state *state = tevent_req_data(
 161                 req, struct cli_read_andx_state);
 162         uint8_t *inbuf;
 163         uint8_t wct;
 164         uint16_t *vwv;
 165         uint32_t num_bytes;
 166         uint8_t *bytes;
 167
 168         state->status = cli_smb_recv(subreq, state, &inbuf, 12, &wct, &vwv,
 169                                      &num_bytes, &bytes);
 170         TALLOC_FREE(subreq);
 171         if (NT_STATUS_IS_ERR(state->status)) {
 172                 tevent_req_nterror(req, state->status);
 173                 return;
 174         }
 175
 176         /* size is the number of bytes the server returned.
 177          * Might be zero. */
 178         state->received = SVAL(vwv + 5, 0);
 179         state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
 180
 181         if (state->received > state->size) {
 182                 DEBUG(5,("server returned more than we wanted!\n"));
 183                 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
 184                 return;
 185         }
 186
 187         /*
 188          * bcc field must be valid for small reads, for large reads the 16-bit
 189          * bcc field can't be correct.
 190          */
 191
 192         if ((state->received < 0xffff) && (state->received > num_bytes)) {
 193                 DEBUG(5, ("server announced more bytes than sent\n"));
 194                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 195                 return;
 196         }
 197
 198         state->buf = (uint8_t *)smb_base(inbuf) + SVAL(vwv+6, 0);
 199
 200         if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
 201             || ((state->received != 0) && (state->buf < bytes))) {
 202                 DEBUG(5, ("server returned invalid read&x data offset\n"));
 203                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 204                 return;
 205         }
 206         tevent_req_done(req);
 207 }
 208
 209 /*
 210  * Pull the data out of a finished async read_and_x request. rcvbuf is
 211  * talloced from the request, so better make sure that you copy it away before
 212  * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
 213  * talloc_move it!
 214  */
 215
 216 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
 217                             uint8_t **rcvbuf)
 218 {
 219         struct cli_read_andx_state *state = tevent_req_data(
 220                 req, struct cli_read_andx_state);
 221         NTSTATUS status;
 222
 223         if (tevent_req_is_nterror(req, &status)) {
 224                 return status;
 225         }
 226         *received = state->received;
 227         *rcvbuf = state->buf;
 228         return NT_STATUS_OK;
 229 }
 230
 231 struct cli_readall_state {
 232         struct tevent_context *ev;
 233         struct cli_state *cli;
 234         uint16_t fnum;
 235         off_t start_offset;
 236         size_t size;
 237         size_t received;
 238         uint8_t *buf;
 239 };
 240
 241 static void cli_readall_done(struct tevent_req *subreq);
 242
 243 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
 244                                            struct event_context *ev,
 245                                            struct cli_state *cli,
 246                                            uint16_t fnum,
 247                                            off_t offset, size_t size)
 248 {
 249         struct tevent_req *req, *subreq;
 250         struct cli_readall_state *state;
 251
 252         req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
 253         if (req == NULL) {
 254                 return NULL;
 255         }
 256         state->ev = ev;
 257         state->cli = cli;
 258         state->fnum = fnum;
 259         state->start_offset = offset;
 260         state->size = size;
 261         state->received = 0;
 262         state->buf = NULL;
 263
 264         subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
 265         if (tevent_req_nomem(subreq, req)) {
 266                 return tevent_req_post(req, ev);
 267         }
 268         tevent_req_set_callback(subreq, cli_readall_done, req);
 269         return req;
 270 }
 271
 272 static void cli_readall_done(struct tevent_req *subreq)
 273 {
 274         struct tevent_req *req = tevent_req_callback_data(
 275                 subreq, struct tevent_req);
 276         struct cli_readall_state *state = tevent_req_data(
 277                 req, struct cli_readall_state);
 278         ssize_t received;
 279         uint8_t *buf;
 280         NTSTATUS status;
 281
 282         status = cli_read_andx_recv(subreq, &received, &buf);
 283         if (!NT_STATUS_IS_OK(status)) {
 284                 tevent_req_nterror(req, status);
 285                 return;
 286         }
 287
 288         if (received == 0) {
 289                 /* EOF */
 290                 tevent_req_done(req);
 291                 return;
 292         }
 293
 294         if ((state->received == 0) && (received == state->size)) {
 295                 /* Ideal case: Got it all in one run */
 296                 state->buf = buf;
 297                 state->received += received;
 298                 tevent_req_done(req);
 299                 return;
 300         }
 301
 302         /*
 303          * We got a short read, issue a read for the
 304          * rest. Unfortunately we have to allocate the buffer
 305          * ourselves now, as our caller expects to receive a single
 306          * buffer. cli_read_andx does it from the buffer received from
 307          * the net, but with a short read we have to put it together
 308          * from several reads.
 309          */
 310
 311         if (state->buf == NULL) {
 312                 state->buf = talloc_array(state, uint8_t, state->size);
 313                 if (tevent_req_nomem(state->buf, req)) {
 314                         return;
 315                 }
 316         }
 317         memcpy(state->buf + state->received, buf, received);
 318         state->received += received;
 319
 320         TALLOC_FREE(subreq);
 321
 322         if (state->received >= state->size) {
 323                 tevent_req_done(req);
 324                 return;
 325         }
 326
 327         subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
 328                                     state->start_offset + state->received,
 329                                     state->size - state->received);
 330         if (tevent_req_nomem(subreq, req)) {
 331                 return;
 332         }
 333         tevent_req_set_callback(subreq, cli_readall_done, req);
 334 }
 335
 336 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
 337                                  uint8_t **rcvbuf)
 338 {
 339         struct cli_readall_state *state = tevent_req_data(
 340                 req, struct cli_readall_state);
 341         NTSTATUS status;
 342
 343         if (tevent_req_is_nterror(req, &status)) {
 344                 return status;
 345         }
 346         *received = state->received;
 347         *rcvbuf = state->buf;
 348         return NT_STATUS_OK;
 349 }
 350
 351 struct cli_pull_subreq {
 352         struct tevent_req *req;
 353         ssize_t received;
 354         uint8_t *buf;
 355 };
 356
 357 /*
 358  * Parallel read support.
 359  *
 360  * cli_pull sends as many read&x requests as the server would allow via
 361  * max_mux at a time. When replies flow back in, the data is written into
 362  * the callback function "sink" in the right order.
 363  */
 364
 365 struct cli_pull_state {
 366         struct tevent_req *req;
 367
 368         struct event_context *ev;
 369         struct cli_state *cli;
 370         uint16_t fnum;
 371         off_t start_offset;
 372         SMB_OFF_T size;
 373
 374         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 375         void *priv;
 376
 377         size_t chunk_size;
 378
 379         /*
 380          * Outstanding requests
 381          */
 382         int num_reqs;
 383         struct cli_pull_subreq *reqs;
 384
 385         /*
 386          * For how many bytes did we send requests already?
 387          */
 388         SMB_OFF_T requested;
 389
 390         /*
 391          * Next request index to push into "sink". This walks around the "req"
 392          * array, taking care that the requests are pushed to "sink" in the
 393          * right order. If necessary (i.e. replies don't come in in the right
 394          * order), replies are held back in "reqs".
 395          */
 396         int top_req;
 397
 398         /*
 399          * How many bytes did we push into "sink"?
 400          */
 401
 402         SMB_OFF_T pushed;
 403 };
 404
 405 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
 406 {
 407         struct cli_pull_state *state = tevent_req_data(
 408                 req, struct cli_pull_state);
 409         char *result;
 410
 411         result = tevent_req_default_print(req, mem_ctx);
 412         if (result == NULL) {
 413                 return NULL;
 414         }
 415
 416         return talloc_asprintf_append_buffer(
 417                 result, "num_reqs=%d, top_req=%d",
 418                 state->num_reqs, state->top_req);
 419 }
 420
 421 static void cli_pull_read_done(struct tevent_req *read_req);
 422
 423 /*
 424  * Prepare an async pull request
 425  */
 426
 427 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 428                                  struct event_context *ev,
 429                                  struct cli_state *cli,
 430                                  uint16_t fnum, off_t start_offset,
 431                                  SMB_OFF_T size, size_t window_size,
 432                                  NTSTATUS (*sink)(char *buf, size_t n,
 433                                                   void *priv),
 434                                  void *priv)
 435 {
 436         struct tevent_req *req;
 437         struct cli_pull_state *state;
 438         int i;
 439
 440         req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
 441         if (req == NULL) {
 442                 return NULL;
 443         }
 444         tevent_req_set_print_fn(req, cli_pull_print);
 445         state->req = req;
 446
 447         state->cli = cli;
 448         state->ev = ev;
 449         state->fnum = fnum;
 450         state->start_offset = start_offset;
 451         state->size = size;
 452         state->sink = sink;
 453         state->priv = priv;
 454
 455         state->pushed = 0;
 456         state->top_req = 0;
 457
 458         if (size == 0) {
 459                 tevent_req_done(req);
 460                 return tevent_req_post(req, ev);
 461         }
 462
 463         state->chunk_size = cli_read_max_bufsize(cli);
 464
 465         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 466         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 467
 468         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
 469                                         state->num_reqs);
 470         if (state->reqs == NULL) {
 471                 goto failed;
 472         }
 473
 474         state->requested = 0;
 475
 476         for (i=0; i<state->num_reqs; i++) {
 477                 struct cli_pull_subreq *subreq = &state->reqs[i];
 478                 SMB_OFF_T size_left;
 479                 size_t request_thistime;
 480
 481                 if (state->requested >= size) {
 482                         state->num_reqs = i;
 483                         break;
 484                 }
 485
 486                 size_left = size - state->requested;
 487                 request_thistime = MIN(size_left, state->chunk_size);
 488
 489                 subreq->req = cli_readall_send(
 490                         state->reqs, ev, cli, fnum,
 491                         state->start_offset + state->requested,
 492                         request_thistime);
 493
 494                 if (subreq->req == NULL) {
 495                         goto failed;
 496                 }
 497                 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
 498                 state->requested += request_thistime;
 499         }
 500         return req;
 501
 502 failed:
 503         TALLOC_FREE(req);
 504         return NULL;
 505 }
 506
 507 /*
 508  * Handle incoming read replies, push the data into sink and send out new
 509  * requests if necessary.
 510  */
 511
 512 static void cli_pull_read_done(struct tevent_req *subreq)
 513 {
 514         struct tevent_req *req = tevent_req_callback_data(
 515                 subreq, struct tevent_req);
 516         struct cli_pull_state *state = tevent_req_data(
 517                 req, struct cli_pull_state);
 518         struct cli_pull_subreq *pull_subreq = NULL;
 519         NTSTATUS status;
 520         int i;
 521
 522         for (i = 0; i < state->num_reqs; i++) {
 523                 pull_subreq = &state->reqs[i];
 524                 if (subreq == pull_subreq->req) {
 525                         break;
 526                 }
 527         }
 528         if (i == state->num_reqs) {
 529                 /* Huh -- received something we did not send?? */
 530                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 531                 return;
 532         }
 533
 534         status = cli_readall_recv(subreq, &pull_subreq->received,
 535                                   &pull_subreq->buf);
 536         if (!NT_STATUS_IS_OK(status)) {
 537                 tevent_req_nterror(state->req, status);
 538                 return;
 539         }
 540
 541         /*
 542          * This loop is the one to take care of out-of-order replies. All
 543          * pending requests are in state->reqs, state->reqs[top_req] is the
 544          * one that is to be pushed next. If however a request later than
 545          * top_req is replied to, then we can't push yet. If top_req is
 546          * replied to at a later point then, we need to push all the finished
 547          * requests.
 548          */
 549
 550         while (state->reqs[state->top_req].req != NULL) {
 551                 struct cli_pull_subreq *top_subreq;
 552
 553                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 554                            state->top_req));
 555
 556                 top_subreq = &state->reqs[state->top_req];
 557
 558                 if (tevent_req_is_in_progress(top_subreq->req)) {
 559                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 560                                    "done\n"));
 561                         return;
 562                 }
 563
 564                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 565                            "pushed\n", (int)top_subreq->received,
 566                            (int)state->pushed));
 567
 568                 status = state->sink((char *)top_subreq->buf,
 569                                      top_subreq->received, state->priv);
 570                 if (!NT_STATUS_IS_OK(status)) {
 571                         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  Issue a single SMBwrite and don't wait for a reply.
 698 ****************************************************************************/
 699
 700 static bool cli_issue_write(struct cli_state *cli,
 701                                 uint16_t fnum,
 702                                 off_t offset,
 703                                 uint16 mode,
 704                                 const char *buf,
 705                                 size_t size)
 706 {
 707         char *p;
 708         bool large_writex = false;
 709         /* We can only do direct writes if not signing and not encrypting. */
 710         bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
 711
 712         if (!direct_writes && size + 1 > cli->bufsize) {
 713                 cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
 714                 if (!cli->outbuf) {
 715                         return False;
 716                 }
 717                 cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
 718                 if (cli->inbuf == NULL) {
 719                         SAFE_FREE(cli->outbuf);
 720                         return False;
 721                 }
 722                 cli->bufsize = size + 1024;
 723         }
 724
 725         memset(cli->outbuf,'\0',smb_size);
 726         memset(cli->inbuf,'\0',smb_size);
 727
 728         if (cli->capabilities & CAP_LARGE_FILES) {
 729                 large_writex = True;
 730         }
 731
 732         if (large_writex) {
 733                 cli_set_message(cli->outbuf,14,0,True);
 734         } else {
 735                 cli_set_message(cli->outbuf,12,0,True);
 736         }
 737
 738         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 739         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 740         cli_setup_packet(cli);
 741
 742         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 743         SSVAL(cli->outbuf,smb_vwv2,fnum);
 744
 745         SIVAL(cli->outbuf,smb_vwv3,offset);
 746         SIVAL(cli->outbuf,smb_vwv5,0);
 747         SSVAL(cli->outbuf,smb_vwv7,mode);
 748
 749         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 750         /*
 751          * According to CIFS-TR-1p00, this following field should only
 752          * be set if CAP_LARGE_WRITEX is set. We should check this
 753          * locally. However, this check might already have been
 754          * done by our callers.
 755          */
 756         SSVAL(cli->outbuf,smb_vwv9,(size>>16));
 757         SSVAL(cli->outbuf,smb_vwv10,size);
 758         /* +1 is pad byte. */
 759         SSVAL(cli->outbuf,smb_vwv11,
 760               smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
 761
 762         if (large_writex) {
 763                 SIVAL(cli->outbuf,smb_vwv12,(((uint64_t)offset)>>32) & 0xffffffff);
 764         }
 765
 766         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
 767         *p++ = '\0'; /* pad byte. */
 768         if (!direct_writes) {
 769                 memcpy(p, buf, size);
 770         }
 771         if (size > 0x1FFFF) {
 772                 /* This is a POSIX 14 word large write. */
 773                 set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
 774                 _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
 775         } else {
 776                 cli_setup_bcc(cli, p+size);
 777         }
 778
 779         show_msg(cli->outbuf);
 780         if (direct_writes) {
 781                 /* For direct writes we now need to write the data
 782                  * directly out of buf. */
 783                 return cli_send_smb_direct_writeX(cli, buf, size);
 784         } else {
 785                 return cli_send_smb(cli);
 786         }
 787 }
 788
 789 /****************************************************************************
 790   write to a file
 791   write_mode: 0x0001 disallow write cacheing
 792               0x0002 return bytes remaining
 793               0x0004 use raw named pipe protocol
 794               0x0008 start of message mode named pipe protocol
 795 ****************************************************************************/
 796
 797 ssize_t cli_write(struct cli_state *cli,
 798                  uint16_t fnum, uint16 write_mode,
 799                  const char *buf, off_t offset, size_t size)
 800 {
 801         ssize_t bwritten = 0;
 802         unsigned int issued = 0;
 803         unsigned int received = 0;
 804         int mpx = 1;
 805         size_t writesize;
 806         int blocks;
 807
 808         if(cli->max_mux > 1) {
 809                 mpx = cli->max_mux-1;
 810         } else {
 811                 mpx = 1;
 812         }
 813
 814         writesize = cli_write_max_bufsize(cli, write_mode);
 815
 816         blocks = (size + (writesize-1)) / writesize;
 817
 818         while (received < blocks) {
 819
 820                 while ((issued - received < mpx) && (issued < blocks)) {
 821                         ssize_t bsent = issued * writesize;
 822                         ssize_t size1 = MIN(writesize, size - bsent);
 823
 824                         if (!cli_issue_write(cli, fnum, offset + bsent,
 825                                         write_mode,
 826                                         buf + bsent,
 827                                         size1))
 828                                 return -1;
 829                         issued++;
 830                 }
 831
 832                 if (!cli_receive_smb(cli)) {
 833                         return bwritten;
 834                 }
 835
 836                 received++;
 837
 838                 if (cli_is_error(cli))
 839                         break;
 840
 841                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 842                 if (writesize > 0xFFFF) {
 843                         bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
 844                 }
 845         }
 846
 847         while (received < issued && cli_receive_smb(cli)) {
 848                 received++;
 849         }
 850
 851         return bwritten;
 852 }
 853
 854 /****************************************************************************
 855   write to a file using a SMBwrite and not bypassing 0 byte writes
 856 ****************************************************************************/
 857
 858 ssize_t cli_smbwrite(struct cli_state *cli,
 859                      uint16_t fnum, char *buf, off_t offset, size_t size1)
 860 {
 861         char *p;
 862         ssize_t total = 0;
 863
 864         do {
 865                 size_t size = MIN(size1, cli->max_xmit - 48);
 866
 867                 memset(cli->outbuf,'\0',smb_size);
 868                 memset(cli->inbuf,'\0',smb_size);
 869
 870                 cli_set_message(cli->outbuf,5, 0,True);
 871
 872                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 873                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 874                 cli_setup_packet(cli);
 875
 876                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 877                 SSVAL(cli->outbuf,smb_vwv1,size);
 878                 SIVAL(cli->outbuf,smb_vwv2,offset);
 879                 SSVAL(cli->outbuf,smb_vwv4,0);
 880
 881                 p = smb_buf(cli->outbuf);
 882                 *p++ = 1;
 883                 SSVAL(p, 0, size); p += 2;
 884                 memcpy(p, buf + total, size); p += size;
 885
 886                 cli_setup_bcc(cli, p);
 887
 888                 if (!cli_send_smb(cli))
 889                         return -1;
 890
 891                 if (!cli_receive_smb(cli))
 892                         return -1;
 893
 894                 if (cli_is_error(cli))
 895                         return -1;
 896
 897                 size = SVAL(cli->inbuf,smb_vwv0);
 898                 if (size == 0)
 899                         break;
 900
 901                 size1 -= size;
 902                 total += size;
 903                 offset += size;
 904
 905         } while (size1);
 906
 907         return total;
 908 }
 909
 910 /*
 911  * Send a write&x request
 912  */
 913
 914 struct cli_write_andx_state {
 915         size_t size;
 916         uint16_t vwv[14];
 917         size_t written;
 918         uint8_t pad;
 919         struct iovec iov[2];
 920 };
 921
 922 static void cli_write_andx_done(struct tevent_req *subreq);
 923
 924 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
 925                                          struct event_context *ev,
 926                                          struct cli_state *cli, uint16_t fnum,
 927                                          uint16_t mode, const uint8_t *buf,
 928                                          off_t offset, size_t size,
 929                                          struct tevent_req **reqs_before,
 930                                          int num_reqs_before,
 931                                          struct tevent_req **psmbreq)
 932 {
 933         struct tevent_req *req, *subreq;
 934         struct cli_write_andx_state *state;
 935         bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
 936         uint8_t wct = bigoffset ? 14 : 12;
 937         size_t max_write = cli_write_max_bufsize(cli, mode);
 938         uint16_t *vwv;
 939
 940         req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
 941         if (req == NULL) {
 942                 return NULL;
 943         }
 944
 945         size = MIN(size, max_write);
 946
 947         vwv = state->vwv;
 948
 949         SCVAL(vwv+0, 0, 0xFF);
 950         SCVAL(vwv+0, 1, 0);
 951         SSVAL(vwv+1, 0, 0);
 952         SSVAL(vwv+2, 0, fnum);
 953         SIVAL(vwv+3, 0, offset);
 954         SIVAL(vwv+5, 0, 0);
 955         SSVAL(vwv+7, 0, mode);
 956         SSVAL(vwv+8, 0, 0);
 957         SSVAL(vwv+9, 0, (size>>16));
 958         SSVAL(vwv+10, 0, size);
 959
 960         SSVAL(vwv+11, 0,
 961               cli_smb_wct_ofs(reqs_before, num_reqs_before)
 962               + 1               /* the wct field */
 963               + wct * 2         /* vwv */
 964               + 2               /* num_bytes field */
 965               + 1               /* pad */);
 966
 967         if (bigoffset) {
 968                 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
 969         }
 970
 971         state->pad = 0;
 972         state->iov[0].iov_base = (void *)&state->pad;
 973         state->iov[0].iov_len = 1;
 974         state->iov[1].iov_base = CONST_DISCARD(void *, buf);
 975         state->iov[1].iov_len = size;
 976
 977         subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
 978                                     2, state->iov);
 979         if (tevent_req_nomem(subreq, req)) {
 980                 return tevent_req_post(req, ev);
 981         }
 982         tevent_req_set_callback(subreq, cli_write_andx_done, req);
 983         *psmbreq = subreq;
 984         return req;
 985 }
 986
 987 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
 988                                        struct event_context *ev,
 989                                        struct cli_state *cli, uint16_t fnum,
 990                                        uint16_t mode, const uint8_t *buf,
 991                                        off_t offset, size_t size)
 992 {
 993         struct tevent_req *req, *subreq;
 994         NTSTATUS status;
 995
 996         req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
 997                                     size, NULL, 0, &subreq);
 998         if (req == NULL) {
 999                 return NULL;
1000         }
1001
1002         status = cli_smb_req_send(subreq);
1003         if (!NT_STATUS_IS_OK(status)) {
1004                 tevent_req_nterror(req, status);
1005                 return tevent_req_post(req, ev);
1006         }
1007         return req;
1008 }
1009
1010 static void cli_write_andx_done(struct tevent_req *subreq)
1011 {
1012         struct tevent_req *req = tevent_req_callback_data(
1013                 subreq, struct tevent_req);
1014         struct cli_write_andx_state *state = tevent_req_data(
1015                 req, struct cli_write_andx_state);
1016         uint8_t wct;
1017         uint16_t *vwv;
1018         uint8_t *inbuf;
1019         NTSTATUS status;
1020
1021         status = cli_smb_recv(subreq, state, &inbuf, 6, &wct, &vwv,
1022                               NULL, NULL);
1023         TALLOC_FREE(subreq);
1024         if (NT_STATUS_IS_ERR(status)) {
1025                 tevent_req_nterror(req, status);
1026                 return;
1027         }
1028         state->written = SVAL(vwv+2, 0);
1029         state->written |= SVAL(vwv+4, 0)<<16;
1030         tevent_req_done(req);
1031 }
1032
1033 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
1034 {
1035         struct cli_write_andx_state *state = tevent_req_data(
1036                 req, struct cli_write_andx_state);
1037         NTSTATUS status;
1038
1039         if (tevent_req_is_nterror(req, &status)) {
1040                 return status;
1041         }
1042         *pwritten = state->written;
1043         return NT_STATUS_OK;
1044 }
1045
1046 struct cli_writeall_state {
1047         struct event_context *ev;
1048         struct cli_state *cli;
1049         uint16_t fnum;
1050         uint16_t mode;
1051         const uint8_t *buf;
1052         off_t offset;
1053         size_t size;
1054         size_t written;
1055 };
1056
1057 static void cli_writeall_written(struct tevent_req *req);
1058
1059 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
1060                                             struct event_context *ev,
1061                                             struct cli_state *cli,
1062                                             uint16_t fnum,
1063                                             uint16_t mode,
1064                                             const uint8_t *buf,
1065                                             off_t offset, size_t size)
1066 {
1067         struct tevent_req *req, *subreq;
1068         struct cli_writeall_state *state;
1069
1070         req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
1071         if (req == NULL) {
1072                 return NULL;
1073         }
1074         state->ev = ev;
1075         state->cli = cli;
1076         state->fnum = fnum;
1077         state->mode = mode;
1078         state->buf = buf;
1079         state->offset = offset;
1080         state->size = size;
1081         state->written = 0;
1082
1083         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1084                                      state->mode, state->buf, state->offset,
1085                                      state->size);
1086         if (tevent_req_nomem(subreq, req)) {
1087                 return tevent_req_post(req, ev);
1088         }
1089         tevent_req_set_callback(subreq, cli_writeall_written, req);
1090         return req;
1091 }
1092
1093 static void cli_writeall_written(struct tevent_req *subreq)
1094 {
1095         struct tevent_req *req = tevent_req_callback_data(
1096                 subreq, struct tevent_req);
1097         struct cli_writeall_state *state = tevent_req_data(
1098                 req, struct cli_writeall_state);
1099         NTSTATUS status;
1100         size_t written, to_write;
1101
1102         status = cli_write_andx_recv(subreq, &written);
1103         TALLOC_FREE(subreq);
1104         if (!NT_STATUS_IS_OK(status)) {
1105                 tevent_req_nterror(req, status);
1106                 return;
1107         }
1108
1109         state->written += written;
1110
1111         if (state->written > state->size) {
1112                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
1113                 return;
1114         }
1115
1116         to_write = state->size - state->written;
1117
1118         if (to_write == 0) {
1119                 tevent_req_done(req);
1120                 return;
1121         }
1122
1123         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1124                                      state->mode,
1125                                      state->buf + state->written,
1126                                      state->offset + state->written, to_write);
1127         if (tevent_req_nomem(subreq, req)) {
1128                 return;
1129         }
1130         tevent_req_set_callback(subreq, cli_writeall_written, req);
1131 }
1132
1133 static NTSTATUS cli_writeall_recv(struct tevent_req *req)
1134 {
1135         return tevent_req_simple_recv_ntstatus(req);
1136 }
1137
1138 struct cli_push_write_state {
1139         struct tevent_req *req;/* This is the main request! Not the subreq */
1140         uint32_t idx;
1141         off_t ofs;
1142         uint8_t *buf;
1143         size_t size;
1144 };
1145
1146 struct cli_push_state {
1147         struct event_context *ev;
1148         struct cli_state *cli;
1149         uint16_t fnum;
1150         uint16_t mode;
1151         off_t start_offset;
1152         size_t window_size;
1153
1154         size_t (*source)(uint8_t *buf, size_t n, void *priv);
1155         void *priv;
1156
1157         bool eof;
1158
1159         size_t chunk_size;
1160         off_t next_offset;
1161
1162         /*
1163          * Outstanding requests
1164          */
1165         uint32_t pending;
1166         uint32_t num_reqs;
1167         struct cli_push_write_state **reqs;
1168 };
1169
1170 static void cli_push_written(struct tevent_req *req);
1171
1172 static bool cli_push_write_setup(struct tevent_req *req,
1173                                  struct cli_push_state *state,
1174                                  uint32_t idx)
1175 {
1176         struct cli_push_write_state *substate;
1177         struct tevent_req *subreq;
1178
1179         substate = talloc(state->reqs, struct cli_push_write_state);
1180         if (!substate) {
1181                 return false;
1182         }
1183         substate->req = req;
1184         substate->idx = idx;
1185         substate->ofs = state->next_offset;
1186         substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1187         if (!substate->buf) {
1188                 talloc_free(substate);
1189                 return false;
1190         }
1191         substate->size = state->source(substate->buf,
1192                                        state->chunk_size,
1193                                        state->priv);
1194         if (substate->size == 0) {
1195                 state->eof = true;
1196                 /* nothing to send */
1197                 talloc_free(substate);
1198                 return true;
1199         }
1200
1201         subreq = cli_writeall_send(substate,
1202                                    state->ev, state->cli,
1203                                    state->fnum, state->mode,
1204                                    substate->buf,
1205                                    substate->ofs,
1206                                    substate->size);
1207         if (!subreq) {
1208                 talloc_free(substate);
1209                 return false;
1210         }
1211         tevent_req_set_callback(subreq, cli_push_written, substate);
1212
1213         state->reqs[idx] = substate;
1214         state->pending += 1;
1215         state->next_offset += substate->size;
1216
1217         return true;
1218 }
1219
1220 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1221                                  struct cli_state *cli,
1222                                  uint16_t fnum, uint16_t mode,
1223                                  off_t start_offset, size_t window_size,
1224                                  size_t (*source)(uint8_t *buf, size_t n,
1225                                                   void *priv),
1226                                  void *priv)
1227 {
1228         struct tevent_req *req;
1229         struct cli_push_state *state;
1230         uint32_t i;
1231
1232         req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1233         if (req == NULL) {
1234                 return NULL;
1235         }
1236         state->cli = cli;
1237         state->ev = ev;
1238         state->fnum = fnum;
1239         state->start_offset = start_offset;
1240         state->mode = mode;
1241         state->source = source;
1242         state->priv = priv;
1243         state->eof = false;
1244         state->pending = 0;
1245         state->next_offset = start_offset;
1246
1247         state->chunk_size = cli_write_max_bufsize(cli, mode);
1248
1249         if (window_size == 0) {
1250                 window_size = cli->max_mux * state->chunk_size;
1251         }
1252         state->num_reqs = window_size/state->chunk_size;
1253         if ((window_size % state->chunk_size) > 0) {
1254                 state->num_reqs += 1;
1255         }
1256         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1257         state->num_reqs = MAX(state->num_reqs, 1);
1258
1259         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
1260                                         state->num_reqs);
1261         if (state->reqs == NULL) {
1262                 goto failed;
1263         }
1264
1265         for (i=0; i<state->num_reqs; i++) {
1266                 if (!cli_push_write_setup(req, state, i)) {
1267                         goto failed;
1268                 }
1269
1270                 if (state->eof) {
1271                         break;
1272                 }
1273         }
1274
1275         if (state->pending == 0) {
1276                 tevent_req_done(req);
1277                 return tevent_req_post(req, ev);
1278         }
1279
1280         return req;
1281
1282  failed:
1283         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1284         return tevent_req_post(req, ev);
1285 }
1286
1287 static void cli_push_written(struct tevent_req *subreq)
1288 {
1289         struct cli_push_write_state *substate = tevent_req_callback_data(
1290                 subreq, struct cli_push_write_state);
1291         struct tevent_req *req = substate->req;
1292         struct cli_push_state *state = tevent_req_data(
1293                 req, struct cli_push_state);
1294         NTSTATUS status;
1295         uint32_t idx = substate->idx;
1296
1297         state->reqs[idx] = NULL;
1298         state->pending -= 1;
1299
1300         status = cli_writeall_recv(subreq);
1301         TALLOC_FREE(subreq);
1302         TALLOC_FREE(substate);
1303         if (!NT_STATUS_IS_OK(status)) {
1304                 tevent_req_nterror(req, status);
1305                 return;
1306         }
1307
1308         if (!state->eof) {
1309                 if (!cli_push_write_setup(req, state, idx)) {
1310                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1311                         return;
1312                 }
1313         }
1314
1315         if (state->pending == 0) {
1316                 tevent_req_done(req);
1317                 return;
1318         }
1319 }
1320
1321 NTSTATUS cli_push_recv(struct tevent_req *req)
1322 {
1323         return tevent_req_simple_recv_ntstatus(req);
1324 }
1325
1326 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1327                   off_t start_offset, size_t window_size,
1328                   size_t (*source)(uint8_t *buf, size_t n, void *priv),
1329                   void *priv)
1330 {
1331         TALLOC_CTX *frame = talloc_stackframe();
1332         struct event_context *ev;
1333         struct tevent_req *req;
1334         NTSTATUS status = NT_STATUS_OK;
1335
1336         if (cli_has_async_calls(cli)) {
1337                 /*
1338                  * Can't use sync call while an async call is in flight
1339                  */
1340                 status = NT_STATUS_INVALID_PARAMETER;
1341                 goto fail;
1342         }
1343
1344         ev = event_context_init(frame);
1345         if (ev == NULL) {
1346                 status = NT_STATUS_NO_MEMORY;
1347                 goto fail;
1348         }
1349
1350         req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1351                             window_size, source, priv);
1352         if (req == NULL) {
1353                 status = NT_STATUS_NO_MEMORY;
1354                 goto fail;
1355         }
1356
1357         if (!tevent_req_poll(req, ev)) {
1358                 status = map_nt_error_from_unix(errno);
1359                 goto fail;
1360         }
1361
1362         status = cli_push_recv(req);
1363  fail:
1364         TALLOC_FREE(frame);
1365         if (!NT_STATUS_IS_OK(status)) {
1366                 cli_set_error(cli, status);
1367         }
1368         return status;
1369 }