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 "libsmb/libsmb.h"
  22 #include "../lib/util/tevent_ntstatus.h"
  23 #include "async_smb.h"
  24 #include "trans2.h"
  25
  26 /****************************************************************************
  27   Calculate the recommended read buffer size
  28 ****************************************************************************/
  29 static size_t cli_read_max_bufsize(struct cli_state *cli)
  30 {
  31         if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
  32             && (cli->server_posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
  33                 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
  34         }
  35         if (cli->capabilities & CAP_LARGE_READX) {
  36                 return cli->is_samba
  37                         ? CLI_SAMBA_MAX_LARGE_READX_SIZE
  38                         : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
  39         }
  40         return (cli->max_xmit - (smb_size+32)) & ~1023;
  41 }
  42
  43 /****************************************************************************
  44   Calculate the recommended write buffer size
  45 ****************************************************************************/
  46 static size_t cli_write_max_bufsize(struct cli_state *cli, uint16_t write_mode)
  47 {
  48         if (write_mode == 0 &&
  49             !client_is_signing_on(cli) &&
  50             !cli_encryption_on(cli) &&
  51             (cli->server_posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
  52             (cli->capabilities & CAP_LARGE_FILES)) {
  53                 /* Only do massive writes if we can do them direct
  54                  * with no signing or encrypting - not on a pipe. */
  55                 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
  56         }
  57
  58         if (cli->is_samba) {
  59                 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
  60         }
  61
  62         if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
  63             || client_is_signing_on(cli)
  64             || strequal(cli->dev, "LPT1:")) {
  65
  66                 /*
  67                  * Printer devices are restricted to max_xmit writesize in
  68                  * Vista and XPSP3 as are signing connections.
  69                  */
  70
  71                 return (cli->max_xmit - (smb_size+32)) & ~1023;
  72         }
  73
  74         return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
  75 }
  76
  77 struct cli_read_andx_state {
  78         size_t size;
  79         uint16_t vwv[12];
  80         NTSTATUS status;
  81         size_t received;
  82         uint8_t *buf;
  83 };
  84
  85 static void cli_read_andx_done(struct tevent_req *subreq);
  86
  87 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
  88                                         struct event_context *ev,
  89                                         struct cli_state *cli, uint16_t fnum,
  90                                         off_t offset, size_t size,
  91                                         struct tevent_req **psmbreq)
  92 {
  93         struct tevent_req *req, *subreq;
  94         struct cli_read_andx_state *state;
  95         uint8_t wct = 10;
  96
  97         if (size > cli_read_max_bufsize(cli)) {
  98                 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
  99                           "size=%d\n", (int)size,
 100                           (int)cli_read_max_bufsize(cli)));
 101                 return NULL;
 102         }
 103
 104         req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
 105         if (req == NULL) {
 106                 return NULL;
 107         }
 108         state->size = size;
 109
 110         SCVAL(state->vwv + 0, 0, 0xFF);
 111         SCVAL(state->vwv + 0, 1, 0);
 112         SSVAL(state->vwv + 1, 0, 0);
 113         SSVAL(state->vwv + 2, 0, fnum);
 114         SIVAL(state->vwv + 3, 0, offset);
 115         SSVAL(state->vwv + 5, 0, size);
 116         SSVAL(state->vwv + 6, 0, size);
 117         SSVAL(state->vwv + 7, 0, (size >> 16));
 118         SSVAL(state->vwv + 8, 0, 0);
 119         SSVAL(state->vwv + 9, 0, 0);
 120
 121         if ((uint64_t)offset >> 32) {
 122                 SIVAL(state->vwv + 10, 0,
 123                       (((uint64_t)offset)>>32) & 0xffffffff);
 124                 wct += 2;
 125         }
 126
 127         subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
 128                                     state->vwv, 0, NULL);
 129         if (subreq == NULL) {
 130                 TALLOC_FREE(req);
 131                 return NULL;
 132         }
 133         tevent_req_set_callback(subreq, cli_read_andx_done, req);
 134         *psmbreq = subreq;
 135         return req;
 136 }
 137
 138 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
 139                                       struct event_context *ev,
 140                                       struct cli_state *cli, uint16_t fnum,
 141                                       off_t offset, size_t size)
 142 {
 143         struct tevent_req *req, *subreq;
 144         NTSTATUS status;
 145
 146         req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
 147                                    &subreq);
 148         if (req == NULL) {
 149                 return NULL;
 150         }
 151
 152         status = cli_smb_req_send(subreq);
 153         if (tevent_req_nterror(req, status)) {
 154                 return tevent_req_post(req, ev);
 155         }
 156         return req;
 157 }
 158
 159 static void cli_read_andx_done(struct tevent_req *subreq)
 160 {
 161         struct tevent_req *req = tevent_req_callback_data(
 162                 subreq, struct tevent_req);
 163         struct cli_read_andx_state *state = tevent_req_data(
 164                 req, struct cli_read_andx_state);
 165         uint8_t *inbuf;
 166         uint8_t wct;
 167         uint16_t *vwv;
 168         uint32_t num_bytes;
 169         uint8_t *bytes;
 170
 171         state->status = cli_smb_recv(subreq, state, &inbuf, 12, &wct, &vwv,
 172                                      &num_bytes, &bytes);
 173         TALLOC_FREE(subreq);
 174         if (NT_STATUS_IS_ERR(state->status)) {
 175                 tevent_req_nterror(req, state->status);
 176                 return;
 177         }
 178
 179         /* size is the number of bytes the server returned.
 180          * Might be zero. */
 181         state->received = SVAL(vwv + 5, 0);
 182         state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
 183
 184         if (state->received > state->size) {
 185                 DEBUG(5,("server returned more than we wanted!\n"));
 186                 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
 187                 return;
 188         }
 189
 190         /*
 191          * bcc field must be valid for small reads, for large reads the 16-bit
 192          * bcc field can't be correct.
 193          */
 194
 195         if ((state->received < 0xffff) && (state->received > num_bytes)) {
 196                 DEBUG(5, ("server announced more bytes than sent\n"));
 197                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 198                 return;
 199         }
 200
 201         state->buf = discard_const_p(uint8_t, smb_base(inbuf)) + SVAL(vwv+6, 0);
 202
 203         if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
 204             || ((state->received != 0) && (state->buf < bytes))) {
 205                 DEBUG(5, ("server returned invalid read&x data offset\n"));
 206                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 207                 return;
 208         }
 209         tevent_req_done(req);
 210 }
 211
 212 /*
 213  * Pull the data out of a finished async read_and_x request. rcvbuf is
 214  * talloced from the request, so better make sure that you copy it away before
 215  * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
 216  * talloc_move it!
 217  */
 218
 219 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
 220                             uint8_t **rcvbuf)
 221 {
 222         struct cli_read_andx_state *state = tevent_req_data(
 223                 req, struct cli_read_andx_state);
 224         NTSTATUS status;
 225
 226         if (tevent_req_is_nterror(req, &status)) {
 227                 return status;
 228         }
 229         *received = state->received;
 230         *rcvbuf = state->buf;
 231         return NT_STATUS_OK;
 232 }
 233
 234 struct cli_readall_state {
 235         struct tevent_context *ev;
 236         struct cli_state *cli;
 237         uint16_t fnum;
 238         off_t start_offset;
 239         size_t size;
 240         size_t received;
 241         uint8_t *buf;
 242 };
 243
 244 static void cli_readall_done(struct tevent_req *subreq);
 245
 246 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
 247                                            struct event_context *ev,
 248                                            struct cli_state *cli,
 249                                            uint16_t fnum,
 250                                            off_t offset, size_t size)
 251 {
 252         struct tevent_req *req, *subreq;
 253         struct cli_readall_state *state;
 254
 255         req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
 256         if (req == NULL) {
 257                 return NULL;
 258         }
 259         state->ev = ev;
 260         state->cli = cli;
 261         state->fnum = fnum;
 262         state->start_offset = offset;
 263         state->size = size;
 264         state->received = 0;
 265         state->buf = NULL;
 266
 267         subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
 268         if (tevent_req_nomem(subreq, req)) {
 269                 return tevent_req_post(req, ev);
 270         }
 271         tevent_req_set_callback(subreq, cli_readall_done, req);
 272         return req;
 273 }
 274
 275 static void cli_readall_done(struct tevent_req *subreq)
 276 {
 277         struct tevent_req *req = tevent_req_callback_data(
 278                 subreq, struct tevent_req);
 279         struct cli_readall_state *state = tevent_req_data(
 280                 req, struct cli_readall_state);
 281         ssize_t received;
 282         uint8_t *buf;
 283         NTSTATUS status;
 284
 285         status = cli_read_andx_recv(subreq, &received, &buf);
 286         if (tevent_req_nterror(req, status)) {
 287                 return;
 288         }
 289
 290         if (received == 0) {
 291                 /* EOF */
 292                 tevent_req_done(req);
 293                 return;
 294         }
 295
 296         if ((state->received == 0) && (received == state->size)) {
 297                 /* Ideal case: Got it all in one run */
 298                 state->buf = buf;
 299                 state->received += received;
 300                 tevent_req_done(req);
 301                 return;
 302         }
 303
 304         /*
 305          * We got a short read, issue a read for the
 306          * rest. Unfortunately we have to allocate the buffer
 307          * ourselves now, as our caller expects to receive a single
 308          * buffer. cli_read_andx does it from the buffer received from
 309          * the net, but with a short read we have to put it together
 310          * from several reads.
 311          */
 312
 313         if (state->buf == NULL) {
 314                 state->buf = talloc_array(state, uint8_t, state->size);
 315                 if (tevent_req_nomem(state->buf, req)) {
 316                         return;
 317                 }
 318         }
 319         memcpy(state->buf + state->received, buf, received);
 320         state->received += received;
 321
 322         TALLOC_FREE(subreq);
 323
 324         if (state->received >= state->size) {
 325                 tevent_req_done(req);
 326                 return;
 327         }
 328
 329         subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
 330                                     state->start_offset + state->received,
 331                                     state->size - state->received);
 332         if (tevent_req_nomem(subreq, req)) {
 333                 return;
 334         }
 335         tevent_req_set_callback(subreq, cli_readall_done, req);
 336 }
 337
 338 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
 339                                  uint8_t **rcvbuf)
 340 {
 341         struct cli_readall_state *state = tevent_req_data(
 342                 req, struct cli_readall_state);
 343         NTSTATUS status;
 344
 345         if (tevent_req_is_nterror(req, &status)) {
 346                 return status;
 347         }
 348         *received = state->received;
 349         *rcvbuf = state->buf;
 350         return NT_STATUS_OK;
 351 }
 352
 353 struct cli_pull_subreq {
 354         struct tevent_req *req;
 355         ssize_t received;
 356         uint8_t *buf;
 357 };
 358
 359 /*
 360  * Parallel read support.
 361  *
 362  * cli_pull sends as many read&x requests as the server would allow via
 363  * max_mux at a time. When replies flow back in, the data is written into
 364  * the callback function "sink" in the right order.
 365  */
 366
 367 struct cli_pull_state {
 368         struct tevent_req *req;
 369
 370         struct event_context *ev;
 371         struct cli_state *cli;
 372         uint16_t fnum;
 373         off_t start_offset;
 374         SMB_OFF_T size;
 375
 376         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 377         void *priv;
 378
 379         size_t chunk_size;
 380
 381         /*
 382          * Outstanding requests
 383          */
 384         int num_reqs;
 385         struct cli_pull_subreq *reqs;
 386
 387         /*
 388          * For how many bytes did we send requests already?
 389          */
 390         SMB_OFF_T requested;
 391
 392         /*
 393          * Next request index to push into "sink". This walks around the "req"
 394          * array, taking care that the requests are pushed to "sink" in the
 395          * right order. If necessary (i.e. replies don't come in in the right
 396          * order), replies are held back in "reqs".
 397          */
 398         int top_req;
 399
 400         /*
 401          * How many bytes did we push into "sink"?
 402          */
 403
 404         SMB_OFF_T pushed;
 405 };
 406
 407 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
 408 {
 409         struct cli_pull_state *state = tevent_req_data(
 410                 req, struct cli_pull_state);
 411         char *result;
 412
 413         result = tevent_req_default_print(req, mem_ctx);
 414         if (result == NULL) {
 415                 return NULL;
 416         }
 417
 418         return talloc_asprintf_append_buffer(
 419                 result, "num_reqs=%d, top_req=%d",
 420                 state->num_reqs, state->top_req);
 421 }
 422
 423 static void cli_pull_read_done(struct tevent_req *read_req);
 424
 425 /*
 426  * Prepare an async pull request
 427  */
 428
 429 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 430                                  struct event_context *ev,
 431                                  struct cli_state *cli,
 432                                  uint16_t fnum, off_t start_offset,
 433                                  SMB_OFF_T size, size_t window_size,
 434                                  NTSTATUS (*sink)(char *buf, size_t n,
 435                                                   void *priv),
 436                                  void *priv)
 437 {
 438         struct tevent_req *req;
 439         struct cli_pull_state *state;
 440         int i;
 441
 442         req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
 443         if (req == NULL) {
 444                 return NULL;
 445         }
 446         tevent_req_set_print_fn(req, cli_pull_print);
 447         state->req = req;
 448
 449         state->cli = cli;
 450         state->ev = ev;
 451         state->fnum = fnum;
 452         state->start_offset = start_offset;
 453         state->size = size;
 454         state->sink = sink;
 455         state->priv = priv;
 456
 457         state->pushed = 0;
 458         state->top_req = 0;
 459
 460         if (size == 0) {
 461                 tevent_req_done(req);
 462                 return tevent_req_post(req, ev);
 463         }
 464
 465         state->chunk_size = cli_read_max_bufsize(cli);
 466
 467         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 468         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 469
 470         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
 471                                         state->num_reqs);
 472         if (state->reqs == NULL) {
 473                 goto failed;
 474         }
 475
 476         state->requested = 0;
 477
 478         for (i=0; i<state->num_reqs; i++) {
 479                 struct cli_pull_subreq *subreq = &state->reqs[i];
 480                 SMB_OFF_T size_left;
 481                 size_t request_thistime;
 482
 483                 if (state->requested >= size) {
 484                         state->num_reqs = i;
 485                         break;
 486                 }
 487
 488                 size_left = size - state->requested;
 489                 request_thistime = MIN(size_left, state->chunk_size);
 490
 491                 subreq->req = cli_readall_send(
 492                         state->reqs, ev, cli, fnum,
 493                         state->start_offset + state->requested,
 494                         request_thistime);
 495
 496                 if (subreq->req == NULL) {
 497                         goto failed;
 498                 }
 499                 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
 500                 state->requested += request_thistime;
 501         }
 502         return req;
 503
 504 failed:
 505         TALLOC_FREE(req);
 506         return NULL;
 507 }
 508
 509 /*
 510  * Handle incoming read replies, push the data into sink and send out new
 511  * requests if necessary.
 512  */
 513
 514 static void cli_pull_read_done(struct tevent_req *subreq)
 515 {
 516         struct tevent_req *req = tevent_req_callback_data(
 517                 subreq, struct tevent_req);
 518         struct cli_pull_state *state = tevent_req_data(
 519                 req, struct cli_pull_state);
 520         struct cli_pull_subreq *pull_subreq = NULL;
 521         NTSTATUS status;
 522         int i;
 523
 524         for (i = 0; i < state->num_reqs; i++) {
 525                 pull_subreq = &state->reqs[i];
 526                 if (subreq == pull_subreq->req) {
 527                         break;
 528                 }
 529         }
 530         if (i == state->num_reqs) {
 531                 /* Huh -- received something we did not send?? */
 532                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 533                 return;
 534         }
 535
 536         status = cli_readall_recv(subreq, &pull_subreq->received,
 537                                   &pull_subreq->buf);
 538         if (!NT_STATUS_IS_OK(status)) {
 539                 tevent_req_nterror(state->req, status);
 540                 return;
 541         }
 542
 543         /*
 544          * This loop is the one to take care of out-of-order replies. All
 545          * pending requests are in state->reqs, state->reqs[top_req] is the
 546          * one that is to be pushed next. If however a request later than
 547          * top_req is replied to, then we can't push yet. If top_req is
 548          * replied to at a later point then, we need to push all the finished
 549          * requests.
 550          */
 551
 552         while (state->reqs[state->top_req].req != NULL) {
 553                 struct cli_pull_subreq *top_subreq;
 554
 555                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 556                            state->top_req));
 557
 558                 top_subreq = &state->reqs[state->top_req];
 559
 560                 if (tevent_req_is_in_progress(top_subreq->req)) {
 561                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 562                                    "done\n"));
 563                         return;
 564                 }
 565
 566                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 567                            "pushed\n", (int)top_subreq->received,
 568                            (int)state->pushed));
 569
 570                 status = state->sink((char *)top_subreq->buf,
 571                                      top_subreq->received, state->priv);
 572                 if (tevent_req_nterror(state->req, status)) {
 573                         return;
 574                 }
 575                 state->pushed += top_subreq->received;
 576
 577                 TALLOC_FREE(state->reqs[state->top_req].req);
 578
 579                 if (state->requested < state->size) {
 580                         struct tevent_req *new_req;
 581                         SMB_OFF_T size_left;
 582                         size_t request_thistime;
 583
 584                         size_left = state->size - state->requested;
 585                         request_thistime = MIN(size_left, state->chunk_size);
 586
 587                         DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
 588                                    "at %d, position %d\n",
 589                                    (int)request_thistime,
 590                                    (int)(state->start_offset
 591                                          + state->requested),
 592                                    state->top_req));
 593
 594                         new_req = cli_readall_send(
 595                                 state->reqs, state->ev, state->cli,
 596                                 state->fnum,
 597                                 state->start_offset + state->requested,
 598                                 request_thistime);
 599
 600                         if (tevent_req_nomem(new_req, state->req)) {
 601                                 return;
 602                         }
 603                         tevent_req_set_callback(new_req, cli_pull_read_done,
 604                                                 req);
 605
 606                         state->reqs[state->top_req].req = new_req;
 607                         state->requested += request_thistime;
 608                 }
 609
 610                 state->top_req = (state->top_req+1) % state->num_reqs;
 611         }
 612
 613         tevent_req_done(req);
 614 }
 615
 616 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
 617 {
 618         struct cli_pull_state *state = tevent_req_data(
 619                 req, struct cli_pull_state);
 620         NTSTATUS status;
 621
 622         if (tevent_req_is_nterror(req, &status)) {
 623                 return status;
 624         }
 625         *received = state->pushed;
 626         return NT_STATUS_OK;
 627 }
 628
 629 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
 630                   off_t start_offset, SMB_OFF_T size, size_t window_size,
 631                   NTSTATUS (*sink)(char *buf, size_t n, void *priv),
 632                   void *priv, SMB_OFF_T *received)
 633 {
 634         TALLOC_CTX *frame = talloc_stackframe();
 635         struct event_context *ev;
 636         struct tevent_req *req;
 637         NTSTATUS status = NT_STATUS_OK;
 638
 639         if (cli_has_async_calls(cli)) {
 640                 /*
 641                  * Can't use sync call while an async call is in flight
 642                  */
 643                 status = NT_STATUS_INVALID_PARAMETER;
 644                 goto fail;
 645         }
 646
 647         ev = event_context_init(frame);
 648         if (ev == NULL) {
 649                 status = NT_STATUS_NO_MEMORY;
 650                 goto fail;
 651         }
 652
 653         req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
 654                             window_size, sink, priv);
 655         if (req == NULL) {
 656                 status = NT_STATUS_NO_MEMORY;
 657                 goto fail;
 658         }
 659
 660         if (!tevent_req_poll(req, ev)) {
 661                 status = map_nt_error_from_unix(errno);
 662                 goto fail;
 663         }
 664
 665         status = cli_pull_recv(req, received);
 666  fail:
 667         TALLOC_FREE(frame);
 668         if (!NT_STATUS_IS_OK(status)) {
 669                 cli_set_error(cli, status);
 670         }
 671         return status;
 672 }
 673
 674 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
 675 {
 676         char **pbuf = (char **)priv;
 677         memcpy(*pbuf, buf, n);
 678         *pbuf += n;
 679         return NT_STATUS_OK;
 680 }
 681
 682 ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
 683                  off_t offset, size_t size)
 684 {
 685         NTSTATUS status;
 686         SMB_OFF_T ret;
 687
 688         status = cli_pull(cli, fnum, offset, size, size,
 689                           cli_read_sink, &buf, &ret);
 690         if (!NT_STATUS_IS_OK(status)) {
 691                 cli_set_error(cli, status);
 692                 return -1;
 693         }
 694         return ret;
 695 }
 696
 697 /****************************************************************************
 698   write to a file using a SMBwrite and not bypassing 0 byte writes
 699 ****************************************************************************/
 700
 701 NTSTATUS cli_smbwrite(struct cli_state *cli, uint16_t fnum, char *buf,
 702                       off_t offset, size_t size1, size_t *ptotal)
 703 {
 704         uint8_t *bytes;
 705         ssize_t total = 0;
 706
 707         /*
 708          * 3 bytes prefix
 709          */
 710
 711         bytes = TALLOC_ARRAY(talloc_tos(), uint8_t, 3);
 712         if (bytes == NULL) {
 713                 return NT_STATUS_NO_MEMORY;
 714         }
 715         bytes[0] = 1;
 716
 717         do {
 718                 size_t size = MIN(size1, cli->max_xmit - 48);
 719                 struct tevent_req *req;
 720                 uint16_t vwv[5];
 721                 uint16_t *ret_vwv;
 722                 NTSTATUS status;
 723
 724                 SSVAL(vwv+0, 0, fnum);
 725                 SSVAL(vwv+1, 0, size);
 726                 SIVAL(vwv+2, 0, offset);
 727                 SSVAL(vwv+4, 0, 0);
 728
 729                 bytes = TALLOC_REALLOC_ARRAY(talloc_tos(), bytes, uint8_t,
 730                                              size+3);
 731                 if (bytes == NULL) {
 732                         return NT_STATUS_NO_MEMORY;
 733                 }
 734                 SSVAL(bytes, 1, size);
 735                 memcpy(bytes + 3, buf + total, size);
 736
 737                 status = cli_smb(talloc_tos(), cli, SMBwrite, 0, 5, vwv,
 738                                  size+3, bytes, &req, 1, NULL, &ret_vwv,
 739                                  NULL, NULL);
 740                 if (!NT_STATUS_IS_OK(status)) {
 741                         TALLOC_FREE(bytes);
 742                         return status;
 743                 }
 744
 745                 size = SVAL(ret_vwv+0, 0);
 746                 TALLOC_FREE(req);
 747                 if (size == 0) {
 748                         break;
 749                 }
 750                 size1 -= size;
 751                 total += size;
 752                 offset += size;
 753
 754         } while (size1);
 755
 756         TALLOC_FREE(bytes);
 757
 758         if (ptotal != NULL) {
 759                 *ptotal = total;
 760         }
 761         return NT_STATUS_OK;
 762 }
 763
 764 /*
 765  * Send a write&x request
 766  */
 767
 768 struct cli_write_andx_state {
 769         size_t size;
 770         uint16_t vwv[14];
 771         size_t written;
 772         uint8_t pad;
 773         struct iovec iov[2];
 774 };
 775
 776 static void cli_write_andx_done(struct tevent_req *subreq);
 777
 778 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
 779                                          struct event_context *ev,
 780                                          struct cli_state *cli, uint16_t fnum,
 781                                          uint16_t mode, const uint8_t *buf,
 782                                          off_t offset, size_t size,
 783                                          struct tevent_req **reqs_before,
 784                                          int num_reqs_before,
 785                                          struct tevent_req **psmbreq)
 786 {
 787         struct tevent_req *req, *subreq;
 788         struct cli_write_andx_state *state;
 789         bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
 790         uint8_t wct = bigoffset ? 14 : 12;
 791         size_t max_write = cli_write_max_bufsize(cli, mode);
 792         uint16_t *vwv;
 793
 794         req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
 795         if (req == NULL) {
 796                 return NULL;
 797         }
 798
 799         size = MIN(size, max_write);
 800
 801         vwv = state->vwv;
 802
 803         SCVAL(vwv+0, 0, 0xFF);
 804         SCVAL(vwv+0, 1, 0);
 805         SSVAL(vwv+1, 0, 0);
 806         SSVAL(vwv+2, 0, fnum);
 807         SIVAL(vwv+3, 0, offset);
 808         SIVAL(vwv+5, 0, 0);
 809         SSVAL(vwv+7, 0, mode);
 810         SSVAL(vwv+8, 0, 0);
 811         SSVAL(vwv+9, 0, (size>>16));
 812         SSVAL(vwv+10, 0, size);
 813
 814         SSVAL(vwv+11, 0,
 815               cli_smb_wct_ofs(reqs_before, num_reqs_before)
 816               + 1               /* the wct field */
 817               + wct * 2         /* vwv */
 818               + 2               /* num_bytes field */
 819               + 1               /* pad */);
 820
 821         if (bigoffset) {
 822                 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
 823         }
 824
 825         state->pad = 0;
 826         state->iov[0].iov_base = (void *)&state->pad;
 827         state->iov[0].iov_len = 1;
 828         state->iov[1].iov_base = discard_const_p(void, buf);
 829         state->iov[1].iov_len = size;
 830
 831         subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
 832                                     2, state->iov);
 833         if (tevent_req_nomem(subreq, req)) {
 834                 return tevent_req_post(req, ev);
 835         }
 836         tevent_req_set_callback(subreq, cli_write_andx_done, req);
 837         *psmbreq = subreq;
 838         return req;
 839 }
 840
 841 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
 842                                        struct event_context *ev,
 843                                        struct cli_state *cli, uint16_t fnum,
 844                                        uint16_t mode, const uint8_t *buf,
 845                                        off_t offset, size_t size)
 846 {
 847         struct tevent_req *req, *subreq;
 848         NTSTATUS status;
 849
 850         req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
 851                                     size, NULL, 0, &subreq);
 852         if (req == NULL) {
 853                 return NULL;
 854         }
 855
 856         status = cli_smb_req_send(subreq);
 857         if (tevent_req_nterror(req, status)) {
 858                 return tevent_req_post(req, ev);
 859         }
 860         return req;
 861 }
 862
 863 static void cli_write_andx_done(struct tevent_req *subreq)
 864 {
 865         struct tevent_req *req = tevent_req_callback_data(
 866                 subreq, struct tevent_req);
 867         struct cli_write_andx_state *state = tevent_req_data(
 868                 req, struct cli_write_andx_state);
 869         uint8_t wct;
 870         uint16_t *vwv;
 871         uint8_t *inbuf;
 872         NTSTATUS status;
 873
 874         status = cli_smb_recv(subreq, state, &inbuf, 6, &wct, &vwv,
 875                               NULL, NULL);
 876         TALLOC_FREE(subreq);
 877         if (NT_STATUS_IS_ERR(status)) {
 878                 tevent_req_nterror(req, status);
 879                 return;
 880         }
 881         state->written = SVAL(vwv+2, 0);
 882         state->written |= SVAL(vwv+4, 0)<<16;
 883         tevent_req_done(req);
 884 }
 885
 886 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
 887 {
 888         struct cli_write_andx_state *state = tevent_req_data(
 889                 req, struct cli_write_andx_state);
 890         NTSTATUS status;
 891
 892         if (tevent_req_is_nterror(req, &status)) {
 893                 return status;
 894         }
 895         *pwritten = state->written;
 896         return NT_STATUS_OK;
 897 }
 898
 899 struct cli_writeall_state {
 900         struct event_context *ev;
 901         struct cli_state *cli;
 902         uint16_t fnum;
 903         uint16_t mode;
 904         const uint8_t *buf;
 905         off_t offset;
 906         size_t size;
 907         size_t written;
 908 };
 909
 910 static void cli_writeall_written(struct tevent_req *req);
 911
 912 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
 913                                             struct event_context *ev,
 914                                             struct cli_state *cli,
 915                                             uint16_t fnum,
 916                                             uint16_t mode,
 917                                             const uint8_t *buf,
 918                                             off_t offset, size_t size)
 919 {
 920         struct tevent_req *req, *subreq;
 921         struct cli_writeall_state *state;
 922
 923         req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
 924         if (req == NULL) {
 925                 return NULL;
 926         }
 927         state->ev = ev;
 928         state->cli = cli;
 929         state->fnum = fnum;
 930         state->mode = mode;
 931         state->buf = buf;
 932         state->offset = offset;
 933         state->size = size;
 934         state->written = 0;
 935
 936         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 937                                      state->mode, state->buf, state->offset,
 938                                      state->size);
 939         if (tevent_req_nomem(subreq, req)) {
 940                 return tevent_req_post(req, ev);
 941         }
 942         tevent_req_set_callback(subreq, cli_writeall_written, req);
 943         return req;
 944 }
 945
 946 static void cli_writeall_written(struct tevent_req *subreq)
 947 {
 948         struct tevent_req *req = tevent_req_callback_data(
 949                 subreq, struct tevent_req);
 950         struct cli_writeall_state *state = tevent_req_data(
 951                 req, struct cli_writeall_state);
 952         NTSTATUS status;
 953         size_t written, to_write;
 954
 955         status = cli_write_andx_recv(subreq, &written);
 956         TALLOC_FREE(subreq);
 957         if (tevent_req_nterror(req, status)) {
 958                 return;
 959         }
 960
 961         state->written += written;
 962
 963         if (state->written > state->size) {
 964                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 965                 return;
 966         }
 967
 968         to_write = state->size - state->written;
 969
 970         if (to_write == 0) {
 971                 tevent_req_done(req);
 972                 return;
 973         }
 974
 975         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 976                                      state->mode,
 977                                      state->buf + state->written,
 978                                      state->offset + state->written, to_write);
 979         if (tevent_req_nomem(subreq, req)) {
 980                 return;
 981         }
 982         tevent_req_set_callback(subreq, cli_writeall_written, req);
 983 }
 984
 985 static NTSTATUS cli_writeall_recv(struct tevent_req *req,
 986                                   size_t *pwritten)
 987 {
 988         struct cli_writeall_state *state = tevent_req_data(
 989                 req, struct cli_writeall_state);
 990         NTSTATUS status;
 991
 992         if (tevent_req_is_nterror(req, &status)) {
 993                 return status;
 994         }
 995         if (pwritten != NULL) {
 996                 *pwritten = state->written;
 997         }
 998         return NT_STATUS_OK;
 999 }
1000
1001 NTSTATUS cli_writeall(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1002                       const uint8_t *buf, off_t offset, size_t size,
1003                       size_t *pwritten)
1004 {
1005         TALLOC_CTX *frame = talloc_stackframe();
1006         struct event_context *ev;
1007         struct tevent_req *req;
1008         NTSTATUS status = NT_STATUS_NO_MEMORY;
1009
1010         if (cli_has_async_calls(cli)) {
1011                 /*
1012                  * Can't use sync call while an async call is in flight
1013                  */
1014                 status = NT_STATUS_INVALID_PARAMETER;
1015                 goto fail;
1016         }
1017         ev = event_context_init(frame);
1018         if (ev == NULL) {
1019                 goto fail;
1020         }
1021         req = cli_writeall_send(frame, ev, cli, fnum, mode, buf, offset, size);
1022         if (req == NULL) {
1023                 goto fail;
1024         }
1025         if (!tevent_req_poll(req, ev)) {
1026                 status = map_nt_error_from_unix(errno);
1027                 goto fail;
1028         }
1029         status = cli_writeall_recv(req, pwritten);
1030  fail:
1031         TALLOC_FREE(frame);
1032         if (!NT_STATUS_IS_OK(status)) {
1033                 cli_set_error(cli, status);
1034         }
1035         return status;
1036 }
1037
1038 struct cli_push_write_state {
1039         struct tevent_req *req;/* This is the main request! Not the subreq */
1040         uint32_t idx;
1041         off_t ofs;
1042         uint8_t *buf;
1043         size_t size;
1044 };
1045
1046 struct cli_push_state {
1047         struct event_context *ev;
1048         struct cli_state *cli;
1049         uint16_t fnum;
1050         uint16_t mode;
1051         off_t start_offset;
1052         size_t window_size;
1053
1054         size_t (*source)(uint8_t *buf, size_t n, void *priv);
1055         void *priv;
1056
1057         bool eof;
1058
1059         size_t chunk_size;
1060         off_t next_offset;
1061
1062         /*
1063          * Outstanding requests
1064          */
1065         uint32_t pending;
1066         uint32_t num_reqs;
1067         struct cli_push_write_state **reqs;
1068 };
1069
1070 static void cli_push_written(struct tevent_req *req);
1071
1072 static bool cli_push_write_setup(struct tevent_req *req,
1073                                  struct cli_push_state *state,
1074                                  uint32_t idx)
1075 {
1076         struct cli_push_write_state *substate;
1077         struct tevent_req *subreq;
1078
1079         substate = talloc(state->reqs, struct cli_push_write_state);
1080         if (!substate) {
1081                 return false;
1082         }
1083         substate->req = req;
1084         substate->idx = idx;
1085         substate->ofs = state->next_offset;
1086         substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1087         if (!substate->buf) {
1088                 talloc_free(substate);
1089                 return false;
1090         }
1091         substate->size = state->source(substate->buf,
1092                                        state->chunk_size,
1093                                        state->priv);
1094         if (substate->size == 0) {
1095                 state->eof = true;
1096                 /* nothing to send */
1097                 talloc_free(substate);
1098                 return true;
1099         }
1100
1101         subreq = cli_writeall_send(substate,
1102                                    state->ev, state->cli,
1103                                    state->fnum, state->mode,
1104                                    substate->buf,
1105                                    substate->ofs,
1106                                    substate->size);
1107         if (!subreq) {
1108                 talloc_free(substate);
1109                 return false;
1110         }
1111         tevent_req_set_callback(subreq, cli_push_written, substate);
1112
1113         state->reqs[idx] = substate;
1114         state->pending += 1;
1115         state->next_offset += substate->size;
1116
1117         return true;
1118 }
1119
1120 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1121                                  struct cli_state *cli,
1122                                  uint16_t fnum, uint16_t mode,
1123                                  off_t start_offset, size_t window_size,
1124                                  size_t (*source)(uint8_t *buf, size_t n,
1125                                                   void *priv),
1126                                  void *priv)
1127 {
1128         struct tevent_req *req;
1129         struct cli_push_state *state;
1130         uint32_t i;
1131
1132         req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1133         if (req == NULL) {
1134                 return NULL;
1135         }
1136         state->cli = cli;
1137         state->ev = ev;
1138         state->fnum = fnum;
1139         state->start_offset = start_offset;
1140         state->mode = mode;
1141         state->source = source;
1142         state->priv = priv;
1143         state->eof = false;
1144         state->pending = 0;
1145         state->next_offset = start_offset;
1146
1147         state->chunk_size = cli_write_max_bufsize(cli, mode);
1148
1149         if (window_size == 0) {
1150                 window_size = cli->max_mux * state->chunk_size;
1151         }
1152         state->num_reqs = window_size/state->chunk_size;
1153         if ((window_size % state->chunk_size) > 0) {
1154                 state->num_reqs += 1;
1155         }
1156         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1157         state->num_reqs = MAX(state->num_reqs, 1);
1158
1159         state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
1160                                         state->num_reqs);
1161         if (state->reqs == NULL) {
1162                 goto failed;
1163         }
1164
1165         for (i=0; i<state->num_reqs; i++) {
1166                 if (!cli_push_write_setup(req, state, i)) {
1167                         goto failed;
1168                 }
1169
1170                 if (state->eof) {
1171                         break;
1172                 }
1173         }
1174
1175         if (state->pending == 0) {
1176                 tevent_req_done(req);
1177                 return tevent_req_post(req, ev);
1178         }
1179
1180         return req;
1181
1182  failed:
1183         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1184         return tevent_req_post(req, ev);
1185 }
1186
1187 static void cli_push_written(struct tevent_req *subreq)
1188 {
1189         struct cli_push_write_state *substate = tevent_req_callback_data(
1190                 subreq, struct cli_push_write_state);
1191         struct tevent_req *req = substate->req;
1192         struct cli_push_state *state = tevent_req_data(
1193                 req, struct cli_push_state);
1194         NTSTATUS status;
1195         uint32_t idx = substate->idx;
1196
1197         state->reqs[idx] = NULL;
1198         state->pending -= 1;
1199
1200         status = cli_writeall_recv(subreq, NULL);
1201         TALLOC_FREE(subreq);
1202         TALLOC_FREE(substate);
1203         if (tevent_req_nterror(req, status)) {
1204                 return;
1205         }
1206
1207         if (!state->eof) {
1208                 if (!cli_push_write_setup(req, state, idx)) {
1209                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1210                         return;
1211                 }
1212         }
1213
1214         if (state->pending == 0) {
1215                 tevent_req_done(req);
1216                 return;
1217         }
1218 }
1219
1220 NTSTATUS cli_push_recv(struct tevent_req *req)
1221 {
1222         return tevent_req_simple_recv_ntstatus(req);
1223 }
1224
1225 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1226                   off_t start_offset, size_t window_size,
1227                   size_t (*source)(uint8_t *buf, size_t n, void *priv),
1228                   void *priv)
1229 {
1230         TALLOC_CTX *frame = talloc_stackframe();
1231         struct event_context *ev;
1232         struct tevent_req *req;
1233         NTSTATUS status = NT_STATUS_OK;
1234
1235         if (cli_has_async_calls(cli)) {
1236                 /*
1237                  * Can't use sync call while an async call is in flight
1238                  */
1239                 status = NT_STATUS_INVALID_PARAMETER;
1240                 goto fail;
1241         }
1242
1243         ev = event_context_init(frame);
1244         if (ev == NULL) {
1245                 status = NT_STATUS_NO_MEMORY;
1246                 goto fail;
1247         }
1248
1249         req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1250                             window_size, source, priv);
1251         if (req == NULL) {
1252                 status = NT_STATUS_NO_MEMORY;
1253                 goto fail;
1254         }
1255
1256         if (!tevent_req_poll(req, ev)) {
1257                 status = map_nt_error_from_unix(errno);
1258                 goto fail;
1259         }
1260
1261         status = cli_push_recv(req);
1262  fail:
1263         TALLOC_FREE(frame);
1264         if (!NT_STATUS_IS_OK(status)) {
1265                 cli_set_error(cli, status);
1266         }
1267         return status;
1268 }