source3/libsmb/clireadwrite.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client file read/write routines
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 /****************************************************************************
  23   Calculate the recommended read buffer size
  24 ****************************************************************************/
  25 static size_t cli_read_max_bufsize(struct cli_state *cli)
  26 {
  27         if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
  28             && (cli->posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
  29                 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
  30         }
  31         if (cli->capabilities & CAP_LARGE_READX) {
  32                 return cli->is_samba
  33                         ? CLI_SAMBA_MAX_LARGE_READX_SIZE
  34                         : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
  35         }
  36         return (cli->max_xmit - (smb_size+32)) & ~1023;
  37 }
  38
  39 /****************************************************************************
  40   Calculate the recommended write buffer size
  41 ****************************************************************************/
  42 static size_t cli_write_max_bufsize(struct cli_state *cli, uint16_t write_mode)
  43 {
  44         if (write_mode == 0 &&
  45             !client_is_signing_on(cli) &&
  46             !cli_encryption_on(cli) &&
  47             (cli->posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
  48             (cli->capabilities & CAP_LARGE_FILES)) {
  49                 /* Only do massive writes if we can do them direct
  50                  * with no signing or encrypting - not on a pipe. */
  51                 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
  52         }
  53
  54         if (cli->is_samba) {
  55                 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
  56         }
  57
  58         if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
  59             || client_is_signing_on(cli)
  60             || strequal(cli->dev, "LPT1:")) {
  61
  62                 /*
  63                  * Printer devices are restricted to max_xmit writesize in
  64                  * Vista and XPSP3 as are signing connections.
  65                  */
  66
  67                 return (cli->max_xmit - (smb_size+32)) & ~1023;
  68         }
  69
  70         return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
  71 }
  72
  73
  74 /*
  75  * Send a read&x request
  76  */
  77
  78 struct async_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
  79                                      struct event_context *ev,
  80                                      struct cli_state *cli, int fnum,
  81                                      off_t offset, size_t size)
  82 {
  83         struct async_req *result;
  84         struct cli_request *req;
  85         bool bigoffset = False;
  86
  87         uint16_t vwv[12];
  88         uint8_t wct = 10;
  89
  90         if (size > cli_read_max_bufsize(cli)) {
  91                 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
  92                           "size=%d\n", (int)size,
  93                           (int)cli_read_max_bufsize(cli)));
  94                 return NULL;
  95         }
  96
  97         SCVAL(vwv + 0, 0, 0xFF);
  98         SCVAL(vwv + 0, 1, 0);
  99         SSVAL(vwv + 1, 0, 0);
 100         SSVAL(vwv + 2, 0, fnum);
 101         SIVAL(vwv + 3, 0, offset);
 102         SSVAL(vwv + 5, 0, size);
 103         SSVAL(vwv + 6, 0, size);
 104         SSVAL(vwv + 7, 0, (size >> 16));
 105         SSVAL(vwv + 8, 0, 0);
 106         SSVAL(vwv + 9, 0, 0);
 107
 108         if ((uint64_t)offset >> 32) {
 109                 bigoffset = True;
 110                 SIVAL(vwv + 10, 0,
 111                       (((uint64_t)offset)>>32) & 0xffffffff);
 112                 wct += 2;
 113         }
 114
 115         result = cli_request_send(mem_ctx, ev, cli, SMBreadX, 0, wct, vwv, 0,
 116                                   0, NULL);
 117         if (result == NULL) {
 118                 return NULL;
 119         }
 120
 121         req = talloc_get_type_abort(result->private_data, struct cli_request);
 122
 123         req->data.read.ofs = offset;
 124         req->data.read.size = size;
 125         req->data.read.received = 0;
 126         req->data.read.rcvbuf = NULL;
 127
 128         return result;
 129 }
 130
 131 /*
 132  * Pull the data out of a finished async read_and_x request. rcvbuf is
 133  * talloced from the request, so better make sure that you copy it away before
 134  * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
 135  * talloc_move it!
 136  */
 137
 138 NTSTATUS cli_read_andx_recv(struct async_req *req, ssize_t *received,
 139                             uint8_t **rcvbuf)
 140 {
 141         struct cli_request *cli_req = talloc_get_type_abort(
 142                 req->private_data, struct cli_request);
 143         uint8_t wct;
 144         uint16_t *vwv;
 145         uint16_t num_bytes;
 146         uint8_t *bytes;
 147         uint8_t *buf;
 148         NTSTATUS status;
 149         size_t size;
 150
 151         if (async_req_is_nterror(req, &status)) {
 152                 return status;
 153         }
 154
 155         status = cli_pull_reply(req, &wct, &vwv, &num_bytes, &bytes);
 156
 157         if (NT_STATUS_IS_ERR(status)) {
 158                 return status;
 159         }
 160
 161         if (wct < 12) {
 162                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 163         }
 164
 165         /* size is the number of bytes the server returned.
 166          * Might be zero. */
 167         size = SVAL(vwv + 5, 0);
 168         size |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
 169
 170         if (size > cli_req->data.read.size) {
 171                 DEBUG(5,("server returned more than we wanted!\n"));
 172                 return NT_STATUS_UNEXPECTED_IO_ERROR;
 173         }
 174
 175         /*
 176          * bcc field must be valid for small reads, for large reads the 16-bit
 177          * bcc field can't be correct.
 178          */
 179
 180         if ((size < 0xffff) && (size > num_bytes)) {
 181                 DEBUG(5, ("server announced more bytes than sent\n"));
 182                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 183         }
 184
 185         buf = (uint8_t *)smb_base(cli_req->inbuf) + SVAL(vwv+6, 0);
 186
 187         if (trans_oob(smb_len(cli_req->inbuf), SVAL(vwv+6, 0), size)
 188             || (buf < bytes)) {
 189                 DEBUG(5, ("server returned invalid read&x data offset\n"));
 190                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 191         }
 192
 193         *rcvbuf = (uint8_t *)(smb_base(cli_req->inbuf) + SVAL(vwv + 6, 0));
 194         *received = size;
 195         return NT_STATUS_OK;
 196 }
 197
 198 /*
 199  * Parallel read support.
 200  *
 201  * cli_pull sends as many read&x requests as the server would allow via
 202  * max_mux at a time. When replies flow back in, the data is written into
 203  * the callback function "sink" in the right order.
 204  */
 205
 206 struct cli_pull_state {
 207         struct async_req *req;
 208
 209         struct event_context *ev;
 210         struct cli_state *cli;
 211         uint16_t fnum;
 212         off_t start_offset;
 213         SMB_OFF_T size;
 214
 215         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 216         void *priv;
 217
 218         size_t chunk_size;
 219
 220         /*
 221          * Outstanding requests
 222          */
 223         int num_reqs;
 224         struct async_req **reqs;
 225
 226         /*
 227          * For how many bytes did we send requests already?
 228          */
 229         SMB_OFF_T requested;
 230
 231         /*
 232          * Next request index to push into "sink". This walks around the "req"
 233          * array, taking care that the requests are pushed to "sink" in the
 234          * right order. If necessary (i.e. replies don't come in in the right
 235          * order), replies are held back in "reqs".
 236          */
 237         int top_req;
 238
 239         /*
 240          * How many bytes did we push into "sink"?
 241          */
 242
 243         SMB_OFF_T pushed;
 244 };
 245
 246 static char *cli_pull_print(TALLOC_CTX *mem_ctx, struct async_req *req)
 247 {
 248         struct cli_pull_state *state = talloc_get_type_abort(
 249                 req->private_data, struct cli_pull_state);
 250         char *result;
 251
 252         result = async_req_print(mem_ctx, req);
 253         if (result == NULL) {
 254                 return NULL;
 255         }
 256
 257         return talloc_asprintf_append_buffer(
 258                 result, "num_reqs=%d, top_req=%d",
 259                 state->num_reqs, state->top_req);
 260 }
 261
 262 static void cli_pull_read_done(struct async_req *read_req);
 263
 264 /*
 265  * Prepare an async pull request
 266  */
 267
 268 struct async_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 269                                 struct event_context *ev,
 270                                 struct cli_state *cli,
 271                                 uint16_t fnum, off_t start_offset,
 272                                 SMB_OFF_T size, size_t window_size,
 273                                 NTSTATUS (*sink)(char *buf, size_t n,
 274                                                  void *priv),
 275                                 void *priv)
 276 {
 277         struct async_req *result;
 278         struct cli_pull_state *state;
 279         int i;
 280
 281         if (!async_req_setup(mem_ctx, &result, &state,
 282                              struct cli_pull_state)) {
 283                 return NULL;
 284         }
 285         result->print = cli_pull_print;
 286         state->req = result;
 287
 288         state->cli = cli;
 289         state->ev = ev;
 290         state->fnum = fnum;
 291         state->start_offset = start_offset;
 292         state->size = size;
 293         state->sink = sink;
 294         state->priv = priv;
 295
 296         state->pushed = 0;
 297         state->top_req = 0;
 298
 299         if (size == 0) {
 300                 if (!async_post_ntstatus(result, ev, NT_STATUS_OK)) {
 301                         goto failed;
 302                 }
 303                 return result;
 304         }
 305
 306         state->chunk_size = cli_read_max_bufsize(cli);
 307
 308         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 309         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 310
 311         state->reqs = TALLOC_ZERO_ARRAY(state, struct async_req *,
 312                                         state->num_reqs);
 313         if (state->reqs == NULL) {
 314                 goto failed;
 315         }
 316
 317         state->requested = 0;
 318
 319         for (i=0; i<state->num_reqs; i++) {
 320                 SMB_OFF_T size_left;
 321                 size_t request_thistime;
 322
 323                 if (state->requested >= size) {
 324                         state->num_reqs = i;
 325                         break;
 326                 }
 327
 328                 size_left = size - state->requested;
 329                 request_thistime = MIN(size_left, state->chunk_size);
 330
 331                 state->reqs[i] = cli_read_andx_send(
 332                         state->reqs, ev, cli, fnum,
 333                         state->start_offset + state->requested,
 334                         request_thistime);
 335
 336                 if (state->reqs[i] == NULL) {
 337                         goto failed;
 338                 }
 339
 340                 state->reqs[i]->async.fn = cli_pull_read_done;
 341                 state->reqs[i]->async.priv = result;
 342
 343                 state->requested += request_thistime;
 344         }
 345         return result;
 346
 347 failed:
 348         TALLOC_FREE(result);
 349         return NULL;
 350 }
 351
 352 /*
 353  * Handle incoming read replies, push the data into sink and send out new
 354  * requests if necessary.
 355  */
 356
 357 static void cli_pull_read_done(struct async_req *read_req)
 358 {
 359         struct async_req *pull_req = talloc_get_type_abort(
 360                 read_req->async.priv, struct async_req);
 361         struct cli_pull_state *state = talloc_get_type_abort(
 362                 pull_req->private_data, struct cli_pull_state);
 363         struct cli_request *read_state = talloc_get_type_abort(
 364                 read_req->private_data, struct cli_request);
 365         NTSTATUS status;
 366
 367         status = cli_read_andx_recv(read_req, &read_state->data.read.received,
 368                                     &read_state->data.read.rcvbuf);
 369         if (!NT_STATUS_IS_OK(status)) {
 370                 async_req_nterror(state->req, status);
 371                 return;
 372         }
 373
 374         /*
 375          * This loop is the one to take care of out-of-order replies. All
 376          * pending requests are in state->reqs, state->reqs[top_req] is the
 377          * one that is to be pushed next. If however a request later than
 378          * top_req is replied to, then we can't push yet. If top_req is
 379          * replied to at a later point then, we need to push all the finished
 380          * requests.
 381          */
 382
 383         while (state->reqs[state->top_req] != NULL) {
 384                 struct cli_request *top_read;
 385
 386                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 387                            state->top_req));
 388
 389                 if (state->reqs[state->top_req]->state < ASYNC_REQ_DONE) {
 390                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 391                                    "done\n"));
 392                         return;
 393                 }
 394
 395                 top_read = talloc_get_type_abort(
 396                         state->reqs[state->top_req]->private_data,
 397                         struct cli_request);
 398
 399                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 400                            "pushed\n", (int)top_read->data.read.received,
 401                            (int)state->pushed));
 402
 403                 status = state->sink((char *)top_read->data.read.rcvbuf,
 404                                      top_read->data.read.received,
 405                                      state->priv);
 406                 if (!NT_STATUS_IS_OK(status)) {
 407                         async_req_nterror(state->req, status);
 408                         return;
 409                 }
 410                 state->pushed += top_read->data.read.received;
 411
 412                 TALLOC_FREE(state->reqs[state->top_req]);
 413
 414                 if (state->requested < state->size) {
 415                         struct async_req *new_req;
 416                         SMB_OFF_T size_left;
 417                         size_t request_thistime;
 418
 419                         size_left = state->size - state->requested;
 420                         request_thistime = MIN(size_left, state->chunk_size);
 421
 422                         DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
 423                                    "at %d, position %d\n",
 424                                    (int)request_thistime,
 425                                    (int)(state->start_offset
 426                                          + state->requested),
 427                                    state->top_req));
 428
 429                         new_req = cli_read_andx_send(
 430                                 state->reqs, state->ev, state->cli,
 431                                 state->fnum,
 432                                 state->start_offset + state->requested,
 433                                 request_thistime);
 434
 435                         if (async_req_nomem(new_req, state->req)) {
 436                                 return;
 437                         }
 438
 439                         new_req->async.fn = cli_pull_read_done;
 440                         new_req->async.priv = pull_req;
 441
 442                         state->reqs[state->top_req] = new_req;
 443                         state->requested += request_thistime;
 444                 }
 445
 446                 state->top_req = (state->top_req+1) % state->num_reqs;
 447         }
 448
 449         async_req_done(pull_req);
 450 }
 451
 452 NTSTATUS cli_pull_recv(struct async_req *req, SMB_OFF_T *received)
 453 {
 454         struct cli_pull_state *state = talloc_get_type_abort(
 455                 req->private_data, struct cli_pull_state);
 456         NTSTATUS status;
 457
 458         if (async_req_is_nterror(req, &status)) {
 459                 return status;
 460         }
 461         *received = state->pushed;
 462         return NT_STATUS_OK;
 463 }
 464
 465 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
 466                   off_t start_offset, SMB_OFF_T size, size_t window_size,
 467                   NTSTATUS (*sink)(char *buf, size_t n, void *priv),
 468                   void *priv, SMB_OFF_T *received)
 469 {
 470         TALLOC_CTX *frame = talloc_stackframe();
 471         struct event_context *ev;
 472         struct async_req *req;
 473         NTSTATUS result = NT_STATUS_NO_MEMORY;
 474
 475         if (cli->fd_event != NULL) {
 476                 /*
 477                  * Can't use sync call while an async call is in flight
 478                  */
 479                 return NT_STATUS_INVALID_PARAMETER;
 480         }
 481
 482         ev = event_context_init(frame);
 483         if (ev == NULL) {
 484                 goto nomem;
 485         }
 486
 487         req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
 488                             window_size, sink, priv);
 489         if (req == NULL) {
 490                 goto nomem;
 491         }
 492
 493         while (req->state < ASYNC_REQ_DONE) {
 494                 event_loop_once(ev);
 495         }
 496
 497         result = cli_pull_recv(req, received);
 498  nomem:
 499         TALLOC_FREE(frame);
 500         return result;
 501 }
 502
 503 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
 504 {
 505         char **pbuf = (char **)priv;
 506         memcpy(*pbuf, buf, n);
 507         *pbuf += n;
 508         return NT_STATUS_OK;
 509 }
 510
 511 ssize_t cli_read(struct cli_state *cli, int fnum, char *buf,
 512                  off_t offset, size_t size)
 513 {
 514         NTSTATUS status;
 515         SMB_OFF_T ret;
 516
 517         status = cli_pull(cli, fnum, offset, size, size,
 518                           cli_read_sink, &buf, &ret);
 519         if (!NT_STATUS_IS_OK(status)) {
 520                 cli_set_error(cli, status);
 521                 return -1;
 522         }
 523         return ret;
 524 }
 525
 526 /****************************************************************************
 527  Issue a single SMBwrite and don't wait for a reply.
 528 ****************************************************************************/
 529
 530 static bool cli_issue_write(struct cli_state *cli,
 531                                 int fnum,
 532                                 off_t offset,
 533                                 uint16 mode,
 534                                 const char *buf,
 535                                 size_t size,
 536                                 int i)
 537 {
 538         char *p;
 539         bool large_writex = false;
 540         /* We can only do direct writes if not signing and not encrypting. */
 541         bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
 542
 543         if (!direct_writes && size + 1 > cli->bufsize) {
 544                 cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
 545                 if (!cli->outbuf) {
 546                         return False;
 547                 }
 548                 cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
 549                 if (cli->inbuf == NULL) {
 550                         SAFE_FREE(cli->outbuf);
 551                         return False;
 552                 }
 553                 cli->bufsize = size + 1024;
 554         }
 555
 556         memset(cli->outbuf,'\0',smb_size);
 557         memset(cli->inbuf,'\0',smb_size);
 558
 559         if (cli->capabilities & CAP_LARGE_FILES) {
 560                 large_writex = True;
 561         }
 562
 563         if (large_writex) {
 564                 cli_set_message(cli->outbuf,14,0,True);
 565         } else {
 566                 cli_set_message(cli->outbuf,12,0,True);
 567         }
 568
 569         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 570         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 571         cli_setup_packet(cli);
 572
 573         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 574         SSVAL(cli->outbuf,smb_vwv2,fnum);
 575
 576         SIVAL(cli->outbuf,smb_vwv3,offset);
 577         SIVAL(cli->outbuf,smb_vwv5,0);
 578         SSVAL(cli->outbuf,smb_vwv7,mode);
 579
 580         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 581         /*
 582          * According to CIFS-TR-1p00, this following field should only
 583          * be set if CAP_LARGE_WRITEX is set. We should check this
 584          * locally. However, this check might already have been
 585          * done by our callers.
 586          */
 587         SSVAL(cli->outbuf,smb_vwv9,(size>>16));
 588         SSVAL(cli->outbuf,smb_vwv10,size);
 589         /* +1 is pad byte. */
 590         SSVAL(cli->outbuf,smb_vwv11,
 591               smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
 592
 593         if (large_writex) {
 594                 SIVAL(cli->outbuf,smb_vwv12,(((uint64_t)offset)>>32) & 0xffffffff);
 595         }
 596
 597         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
 598         *p++ = '\0'; /* pad byte. */
 599         if (!direct_writes) {
 600                 memcpy(p, buf, size);
 601         }
 602         if (size > 0x1FFFF) {
 603                 /* This is a POSIX 14 word large write. */
 604                 set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
 605                 _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
 606         } else {
 607                 cli_setup_bcc(cli, p+size);
 608         }
 609
 610         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 611
 612         show_msg(cli->outbuf);
 613         if (direct_writes) {
 614                 /* For direct writes we now need to write the data
 615                  * directly out of buf. */
 616                 return cli_send_smb_direct_writeX(cli, buf, size);
 617         } else {
 618                 return cli_send_smb(cli);
 619         }
 620 }
 621
 622 /****************************************************************************
 623   write to a file
 624   write_mode: 0x0001 disallow write cacheing
 625               0x0002 return bytes remaining
 626               0x0004 use raw named pipe protocol
 627               0x0008 start of message mode named pipe protocol
 628 ****************************************************************************/
 629
 630 ssize_t cli_write(struct cli_state *cli,
 631                  int fnum, uint16 write_mode,
 632                  const char *buf, off_t offset, size_t size)
 633 {
 634         ssize_t bwritten = 0;
 635         unsigned int issued = 0;
 636         unsigned int received = 0;
 637         int mpx = 1;
 638         size_t writesize;
 639         int blocks;
 640
 641         if(cli->max_mux > 1) {
 642                 mpx = cli->max_mux-1;
 643         } else {
 644                 mpx = 1;
 645         }
 646
 647         writesize = cli_write_max_bufsize(cli, write_mode);
 648
 649         blocks = (size + (writesize-1)) / writesize;
 650
 651         while (received < blocks) {
 652
 653                 while ((issued - received < mpx) && (issued < blocks)) {
 654                         ssize_t bsent = issued * writesize;
 655                         ssize_t size1 = MIN(writesize, size - bsent);
 656
 657                         if (!cli_issue_write(cli, fnum, offset + bsent,
 658                                         write_mode,
 659                                         buf + bsent,
 660                                         size1, issued))
 661                                 return -1;
 662                         issued++;
 663                 }
 664
 665                 if (!cli_receive_smb(cli)) {
 666                         return bwritten;
 667                 }
 668
 669                 received++;
 670
 671                 if (cli_is_error(cli))
 672                         break;
 673
 674                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 675                 if (writesize > 0xFFFF) {
 676                         bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
 677                 }
 678         }
 679
 680         while (received < issued && cli_receive_smb(cli)) {
 681                 received++;
 682         }
 683
 684         return bwritten;
 685 }
 686
 687 /****************************************************************************
 688   write to a file using a SMBwrite and not bypassing 0 byte writes
 689 ****************************************************************************/
 690
 691 ssize_t cli_smbwrite(struct cli_state *cli,
 692                      int fnum, char *buf, off_t offset, size_t size1)
 693 {
 694         char *p;
 695         ssize_t total = 0;
 696
 697         do {
 698                 size_t size = MIN(size1, cli->max_xmit - 48);
 699
 700                 memset(cli->outbuf,'\0',smb_size);
 701                 memset(cli->inbuf,'\0',smb_size);
 702
 703                 cli_set_message(cli->outbuf,5, 0,True);
 704
 705                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 706                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 707                 cli_setup_packet(cli);
 708
 709                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 710                 SSVAL(cli->outbuf,smb_vwv1,size);
 711                 SIVAL(cli->outbuf,smb_vwv2,offset);
 712                 SSVAL(cli->outbuf,smb_vwv4,0);
 713
 714                 p = smb_buf(cli->outbuf);
 715                 *p++ = 1;
 716                 SSVAL(p, 0, size); p += 2;
 717                 memcpy(p, buf + total, size); p += size;
 718
 719                 cli_setup_bcc(cli, p);
 720
 721                 if (!cli_send_smb(cli))
 722                         return -1;
 723
 724                 if (!cli_receive_smb(cli))
 725                         return -1;
 726
 727                 if (cli_is_error(cli))
 728                         return -1;
 729
 730                 size = SVAL(cli->inbuf,smb_vwv0);
 731                 if (size == 0)
 732                         break;
 733
 734                 size1 -= size;
 735                 total += size;
 736                 offset += size;
 737
 738         } while (size1);
 739
 740         return total;
 741 }
 742
 743 /*
 744  * Send a write&x request
 745  */
 746
 747 struct async_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
 748                                       struct event_context *ev,
 749                                       struct cli_state *cli, uint16_t fnum,
 750                                       uint16_t mode, const uint8_t *buf,
 751                                       off_t offset, size_t size)
 752 {
 753         bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
 754         uint8_t wct = bigoffset ? 14 : 12;
 755         size_t max_write = cli_write_max_bufsize(cli, mode);
 756         uint16_t vwv[14];
 757
 758         size = MIN(size, max_write);
 759
 760         SCVAL(vwv+0, 0, 0xFF);
 761         SCVAL(vwv+0, 1, 0);
 762         SSVAL(vwv+1, 0, 0);
 763         SSVAL(vwv+2, 0, fnum);
 764         SIVAL(vwv+3, 0, offset);
 765         SIVAL(vwv+5, 0, 0);
 766         SSVAL(vwv+7, 0, mode);
 767         SSVAL(vwv+8, 0, 0);
 768         SSVAL(vwv+9, 0, (size>>16));
 769         SSVAL(vwv+10, 0, size);
 770
 771         SSVAL(vwv+11, 0,
 772               cli_wct_ofs(cli)
 773               + 1               /* the wct field */
 774               + wct * 2         /* vwv */
 775               + 2               /* num_bytes field */
 776               + 1               /* pad */);
 777
 778         if (bigoffset) {
 779                 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
 780         }
 781
 782         return cli_request_send(mem_ctx, ev, cli, SMBwriteX, 0, wct, vwv,
 783                                 2, size, buf);
 784 }
 785
 786 NTSTATUS cli_write_andx_recv(struct async_req *req, size_t *pwritten)
 787 {
 788         uint8_t wct;
 789         uint16_t *vwv;
 790         uint16_t num_bytes;
 791         uint8_t *bytes;
 792         NTSTATUS status;
 793         size_t written;
 794
 795         if (async_req_is_nterror(req, &status)) {
 796                 return status;
 797         }
 798
 799         status = cli_pull_reply(req, &wct, &vwv, &num_bytes, &bytes);
 800
 801         if (NT_STATUS_IS_ERR(status)) {
 802                 return status;
 803         }
 804
 805         if (wct < 6) {
 806                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 807         }
 808
 809         written = SVAL(vwv+2, 0);
 810         written |= SVAL(vwv+4, 0)<<16;
 811         *pwritten = written;
 812
 813         return NT_STATUS_OK;
 814 }
 815
 816 struct cli_writeall_state {
 817         struct event_context *ev;
 818         struct cli_state *cli;
 819         uint16_t fnum;
 820         uint16_t mode;
 821         const uint8_t *buf;
 822         off_t offset;
 823         size_t size;
 824         size_t written;
 825 };
 826
 827 static void cli_writeall_written(struct async_req *req);
 828
 829 static struct async_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
 830                                            struct event_context *ev,
 831                                            struct cli_state *cli,
 832                                            uint16_t fnum,
 833                                            uint16_t mode,
 834                                            const uint8_t *buf,
 835                                            off_t offset, size_t size)
 836 {
 837         struct async_req *result;
 838         struct async_req *subreq;
 839         struct cli_writeall_state *state;
 840
 841         if (!async_req_setup(mem_ctx, &result, &state,
 842                              struct cli_writeall_state)) {
 843                 return NULL;
 844         }
 845         state->ev = ev;
 846         state->cli = cli;
 847         state->fnum = fnum;
 848         state->mode = mode;
 849         state->buf = buf;
 850         state->offset = offset;
 851         state->size = size;
 852         state->written = 0;
 853
 854         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 855                                      state->mode, state->buf, state->offset,
 856                                      state->size);
 857         if (subreq == NULL) {
 858                 goto fail;
 859         }
 860
 861         subreq->async.fn = cli_writeall_written;
 862         subreq->async.priv = result;
 863         return result;
 864
 865  fail:
 866         TALLOC_FREE(result);
 867         return NULL;
 868 }
 869
 870 static void cli_writeall_written(struct async_req *subreq)
 871 {
 872         struct async_req *req = talloc_get_type_abort(
 873                 subreq->async.priv, struct async_req);
 874         struct cli_writeall_state *state = talloc_get_type_abort(
 875                 req->private_data, struct cli_writeall_state);
 876         NTSTATUS status;
 877         size_t written, to_write;
 878
 879         status = cli_write_andx_recv(subreq, &written);
 880         TALLOC_FREE(subreq);
 881         if (!NT_STATUS_IS_OK(status)) {
 882                 async_req_nterror(req, status);
 883                 return;
 884         }
 885
 886         state->written += written;
 887
 888         if (state->written > state->size) {
 889                 async_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 890                 return;
 891         }
 892
 893         to_write = state->size - state->written;
 894
 895         if (to_write == 0) {
 896                 async_req_done(req);
 897                 return;
 898         }
 899
 900         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 901                                      state->mode,
 902                                      state->buf + state->written,
 903                                      state->offset + state->written, to_write);
 904         if (subreq == NULL) {
 905                 async_req_nterror(req, NT_STATUS_NO_MEMORY);
 906                 return;
 907         }
 908
 909         subreq->async.fn = cli_writeall_written;
 910         subreq->async.priv = req;
 911 }
 912
 913 static NTSTATUS cli_writeall_recv(struct async_req *req)
 914 {
 915         return async_req_simple_recv_ntstatus(req);
 916 }
 917
 918 struct cli_push_state {
 919         struct async_req *req;
 920
 921         struct event_context *ev;
 922         struct cli_state *cli;
 923         uint16_t fnum;
 924         uint16_t mode;
 925         off_t start_offset;
 926         size_t window_size;
 927
 928         size_t (*source)(uint8_t *buf, size_t n, void *priv);
 929         void *priv;
 930
 931         size_t chunk_size;
 932
 933         size_t sent;
 934         bool eof;
 935
 936         /*
 937          * Outstanding requests
 938          */
 939         int num_reqs;
 940         struct async_req **reqs;
 941
 942         int pending;
 943
 944         uint8_t *buf;
 945 };
 946
 947 static void cli_push_written(struct async_req *req);
 948
 949 struct async_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 950                                 struct cli_state *cli,
 951                                 uint16_t fnum, uint16_t mode,
 952                                 off_t start_offset, size_t window_size,
 953                                 size_t (*source)(uint8_t *buf, size_t n,
 954                                                  void *priv),
 955                                 void *priv)
 956 {
 957         struct async_req *result;
 958         struct cli_push_state *state;
 959         int i;
 960
 961         if (!async_req_setup(mem_ctx, &result, &state,
 962                              struct cli_push_state)) {
 963                 return NULL;
 964         }
 965         state->req = result;
 966
 967         state->cli = cli;
 968         state->ev = ev;
 969         state->fnum = fnum;
 970         state->start_offset = start_offset;
 971         state->mode = mode;
 972         state->source = source;
 973         state->priv = priv;
 974         state->eof = false;
 975         state->sent = 0;
 976         state->pending = 0;
 977
 978         state->chunk_size = cli_write_max_bufsize(cli, mode);
 979
 980         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 981         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 982
 983         state->reqs = TALLOC_ZERO_ARRAY(state, struct async_req *,
 984                                         state->num_reqs);
 985         if (state->reqs == NULL) {
 986                 goto failed;
 987         }
 988
 989         state->buf = TALLOC_ARRAY(
 990                 state, uint8_t, state->chunk_size * state->num_reqs);
 991         if (state->buf == NULL) {
 992                 goto failed;
 993         }
 994
 995         for (i=0; i<state->num_reqs; i++) {
 996                 size_t to_write;
 997                 uint8_t *buf = state->buf + i*state->chunk_size;
 998
 999                 to_write = state->source(buf, state->chunk_size, state->priv);
1000                 if (to_write == 0) {
1001                         state->eof = true;
1002                         break;
1003                 }
1004
1005                 state->reqs[i] = cli_writeall_send(
1006                         state->reqs, state->ev, state->cli, state->fnum,
1007                         state->mode, buf, state->start_offset + state->sent,
1008                         to_write);
1009                 if (state->reqs[i] == NULL) {
1010                         goto failed;
1011                 }
1012
1013                 state->reqs[i]->async.fn = cli_push_written;
1014                 state->reqs[i]->async.priv = state;
1015
1016                 state->sent += to_write;
1017                 state->pending += 1;
1018         }
1019
1020         if (i == 0) {
1021                 if (!async_post_ntstatus(result, ev, NT_STATUS_OK)) {
1022                         goto failed;
1023                 }
1024                 return result;
1025         }
1026
1027         return result;
1028
1029  failed:
1030         TALLOC_FREE(result);
1031         return NULL;
1032 }
1033
1034 static void cli_push_written(struct async_req *req)
1035 {
1036         struct cli_push_state *state = talloc_get_type_abort(
1037                 req->async.priv, struct cli_push_state);
1038         NTSTATUS status;
1039         int i;
1040         uint8_t *buf;
1041         size_t to_write;
1042
1043         for (i=0; i<state->num_reqs; i++) {
1044                 if (state->reqs[i] == req) {
1045                         break;
1046                 }
1047         }
1048
1049         if (i == state->num_reqs) {
1050                 async_req_nterror(state->req, NT_STATUS_INTERNAL_ERROR);
1051                 return;
1052         }
1053
1054         status = cli_writeall_recv(req);
1055         TALLOC_FREE(state->reqs[i]);
1056         req = NULL;
1057         if (!NT_STATUS_IS_OK(status)) {
1058                 async_req_nterror(state->req, status);
1059                 return;
1060         }
1061
1062         state->pending -= 1;
1063         if (state->pending == 0) {
1064                 async_req_done(state->req);
1065                 return;
1066         }
1067
1068         if (state->eof) {
1069                 return;
1070         }
1071
1072         buf = state->buf + i * state->chunk_size;
1073
1074         to_write = state->source(buf, state->chunk_size, state->priv);
1075         if (to_write == 0) {
1076                 state->eof = true;
1077                 return;
1078         }
1079
1080         state->reqs[i] = cli_writeall_send(
1081                 state->reqs, state->ev, state->cli, state->fnum,
1082                 state->mode, buf, state->start_offset + state->sent, to_write);
1083         if (state->reqs[i] == NULL) {
1084                 async_req_nterror(state->req, NT_STATUS_NO_MEMORY);
1085                 return;
1086         }
1087
1088         state->reqs[i]->async.fn = cli_push_written;
1089         state->reqs[i]->async.priv = state;
1090
1091         state->sent += to_write;
1092         state->pending += 1;
1093 }
1094
1095 NTSTATUS cli_push_recv(struct async_req *req)
1096 {
1097         return async_req_simple_recv_ntstatus(req);
1098 }
1099
1100 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1101                   off_t start_offset, size_t window_size,
1102                   size_t (*source)(uint8_t *buf, size_t n, void *priv),
1103                   void *priv)
1104 {
1105         TALLOC_CTX *frame = talloc_stackframe();
1106         struct event_context *ev;
1107         struct async_req *req;
1108         NTSTATUS result = NT_STATUS_NO_MEMORY;
1109
1110         if (cli->fd_event != NULL) {
1111                 /*
1112                  * Can't use sync call while an async call is in flight
1113                  */
1114                 return NT_STATUS_INVALID_PARAMETER;
1115         }
1116
1117         ev = event_context_init(frame);
1118         if (ev == NULL) {
1119                 goto nomem;
1120         }
1121
1122         req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1123                             window_size, source, priv);
1124         if (req == NULL) {
1125                 goto nomem;
1126         }
1127
1128         while (req->state < ASYNC_REQ_DONE) {
1129                 event_loop_once(ev);
1130         }
1131
1132         result = cli_push_recv(req);
1133  nomem:
1134         TALLOC_FREE(frame);
1135         return result;
1136 }