source3/libsmb/async_smb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async SMB client requests
   4    Copyright (C) Volker Lendecke 2008
   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  * Read an smb packet asynchronously, discard keepalives
  24  */
  25
  26 struct read_smb_state {
  27         struct tevent_context *ev;
  28         int fd;
  29         uint8_t *buf;
  30 };
  31
  32 static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data);
  33 static void read_smb_done(struct tevent_req *subreq);
  34
  35 static struct tevent_req *read_smb_send(TALLOC_CTX *mem_ctx,
  36                                         struct tevent_context *ev,
  37                                         int fd)
  38 {
  39         struct tevent_req *result, *subreq;
  40         struct read_smb_state *state;
  41
  42         result = tevent_req_create(mem_ctx, &state, struct read_smb_state);
  43         if (result == NULL) {
  44                 return NULL;
  45         }
  46         state->ev = ev;
  47         state->fd = fd;
  48
  49         subreq = read_packet_send(state, ev, fd, 4, read_smb_more, NULL);
  50         if (subreq == NULL) {
  51                 goto fail;
  52         }
  53         tevent_req_set_callback(subreq, read_smb_done, result);
  54         return result;
  55  fail:
  56         TALLOC_FREE(result);
  57         return NULL;
  58 }
  59
  60 static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data)
  61 {
  62         if (buflen > 4) {
  63                 return 0;       /* We've been here, we're done */
  64         }
  65         return smb_len_large(buf);
  66 }
  67
  68 static void read_smb_done(struct tevent_req *subreq)
  69 {
  70         struct tevent_req *req = tevent_req_callback_data(
  71                 subreq, struct tevent_req);
  72         struct read_smb_state *state = tevent_req_data(
  73                 req, struct read_smb_state);
  74         ssize_t len;
  75         int err;
  76
  77         len = read_packet_recv(subreq, state, &state->buf, &err);
  78         TALLOC_FREE(subreq);
  79         if (len == -1) {
  80                 tevent_req_error(req, err);
  81                 return;
  82         }
  83
  84         if (CVAL(state->buf, 0) == SMBkeepalive) {
  85                 subreq = read_packet_send(state, state->ev, state->fd, 4,
  86                                           read_smb_more, NULL);
  87                 if (tevent_req_nomem(subreq, req)) {
  88                         return;
  89                 }
  90                 tevent_req_set_callback(subreq, read_smb_done, req);
  91                 return;
  92         }
  93         tevent_req_done(req);
  94 }
  95
  96 static ssize_t read_smb_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
  97                              uint8_t **pbuf, int *perrno)
  98 {
  99         struct read_smb_state *state = tevent_req_data(
 100                 req, struct read_smb_state);
 101
 102         if (tevent_req_is_unix_error(req, perrno)) {
 103                 return -1;
 104         }
 105         *pbuf = talloc_move(mem_ctx, &state->buf);
 106         return talloc_get_size(*pbuf);
 107 }
 108
 109 /**
 110  * Fetch an error out of a NBT packet
 111  * @param[in] buf       The SMB packet
 112  * @retval              The error, converted to NTSTATUS
 113  */
 114
 115 NTSTATUS cli_pull_error(char *buf)
 116 {
 117         uint32_t flags2 = SVAL(buf, smb_flg2);
 118
 119         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
 120                 return NT_STATUS(IVAL(buf, smb_rcls));
 121         }
 122
 123         /* if the client uses dos errors, but there is no error,
 124            we should return no error here, otherwise it looks
 125            like an unknown bad NT_STATUS. jmcd */
 126         if (CVAL(buf, smb_rcls) == 0)
 127                 return NT_STATUS_OK;
 128
 129         return NT_STATUS_DOS(CVAL(buf, smb_rcls), SVAL(buf,smb_err));
 130 }
 131
 132 /**
 133  * Compatibility helper for the sync APIs: Fake NTSTATUS in cli->inbuf
 134  * @param[in] cli       The client connection that just received an error
 135  * @param[in] status    The error to set on "cli"
 136  */
 137
 138 void cli_set_error(struct cli_state *cli, NTSTATUS status)
 139 {
 140         uint32_t flags2 = SVAL(cli->inbuf, smb_flg2);
 141
 142         if (NT_STATUS_IS_DOS(status)) {
 143                 SSVAL(cli->inbuf, smb_flg2,
 144                       flags2 & ~FLAGS2_32_BIT_ERROR_CODES);
 145                 SCVAL(cli->inbuf, smb_rcls, NT_STATUS_DOS_CLASS(status));
 146                 SSVAL(cli->inbuf, smb_err, NT_STATUS_DOS_CODE(status));
 147                 return;
 148         }
 149
 150         SSVAL(cli->inbuf, smb_flg2, flags2 | FLAGS2_32_BIT_ERROR_CODES);
 151         SIVAL(cli->inbuf, smb_rcls, NT_STATUS_V(status));
 152         return;
 153 }
 154
 155 /**
 156  * Figure out if there is an andx command behind the current one
 157  * @param[in] buf       The smb buffer to look at
 158  * @param[in] ofs       The offset to the wct field that is followed by the cmd
 159  * @retval Is there a command following?
 160  */
 161
 162 static bool have_andx_command(const char *buf, uint16_t ofs)
 163 {
 164         uint8_t wct;
 165         size_t buflen = talloc_get_size(buf);
 166
 167         if ((ofs == buflen-1) || (ofs == buflen)) {
 168                 return false;
 169         }
 170
 171         wct = CVAL(buf, ofs);
 172         if (wct < 2) {
 173                 /*
 174                  * Not enough space for the command and a following pointer
 175                  */
 176                 return false;
 177         }
 178         return (CVAL(buf, ofs+1) != 0xff);
 179 }
 180
 181 #define MAX_SMB_IOV 5
 182
 183 struct cli_smb_state {
 184         struct tevent_context *ev;
 185         struct cli_state *cli;
 186         uint8_t header[smb_wct+1]; /* Space for the header including the wct */
 187
 188         /*
 189          * For normal requests, cli_smb_req_send chooses a mid. Secondary
 190          * trans requests need to use the mid of the primary request, so we
 191          * need a place to store it. Assume it's set if != 0.
 192          */
 193         uint16_t mid;
 194
 195         uint16_t *vwv;
 196         uint8_t bytecount_buf[2];
 197
 198         struct iovec iov[MAX_SMB_IOV+3];
 199         int iov_count;
 200
 201         uint8_t *inbuf;
 202         uint32_t seqnum;
 203         int chain_num;
 204         int chain_length;
 205         struct tevent_req **chained_requests;
 206 };
 207
 208 static uint16_t cli_alloc_mid(struct cli_state *cli)
 209 {
 210         int num_pending = talloc_array_length(cli->pending);
 211         uint16_t result;
 212
 213         while (true) {
 214                 int i;
 215
 216                 result = cli->mid++;
 217                 if ((result == 0) || (result == 0xffff)) {
 218                         continue;
 219                 }
 220
 221                 for (i=0; i<num_pending; i++) {
 222                         if (result == cli_smb_req_mid(cli->pending[i])) {
 223                                 break;
 224                         }
 225                 }
 226
 227                 if (i == num_pending) {
 228                         return result;
 229                 }
 230         }
 231 }
 232
 233 void cli_smb_req_unset_pending(struct tevent_req *req)
 234 {
 235         struct cli_smb_state *state = tevent_req_data(
 236                 req, struct cli_smb_state);
 237         struct cli_state *cli = state->cli;
 238         int num_pending = talloc_array_length(cli->pending);
 239         int i;
 240
 241         if (num_pending == 1) {
 242                 /*
 243                  * The pending read_smb tevent_req is a child of
 244                  * cli->pending. So if nothing is pending anymore, we need to
 245                  * delete the socket read fde.
 246                  */
 247                 TALLOC_FREE(cli->pending);
 248                 return;
 249         }
 250
 251         for (i=0; i<num_pending; i++) {
 252                 if (req == cli->pending[i]) {
 253                         break;
 254                 }
 255         }
 256         if (i == num_pending) {
 257                 /*
 258                  * Something's seriously broken. Just returning here is the
 259                  * right thing nevertheless, the point of this routine is to
 260                  * remove ourselves from cli->pending.
 261                  */
 262                 return;
 263         }
 264
 265         /*
 266          * Remove ourselves from the cli->pending array
 267          */
 268         if (num_pending > 1) {
 269                 cli->pending[i] = cli->pending[num_pending-1];
 270         }
 271
 272         /*
 273          * No NULL check here, we're shrinking by sizeof(void *), and
 274          * talloc_realloc just adjusts the size for this.
 275          */
 276         cli->pending = talloc_realloc(NULL, cli->pending, struct tevent_req *,
 277                                       num_pending - 1);
 278         return;
 279 }
 280
 281 static int cli_smb_req_destructor(struct tevent_req *req)
 282 {
 283         cli_smb_req_unset_pending(req);
 284         return 0;
 285 }
 286
 287 static void cli_smb_received(struct tevent_req *subreq);
 288
 289 bool cli_smb_req_set_pending(struct tevent_req *req)
 290 {
 291         struct cli_smb_state *state = tevent_req_data(
 292                 req, struct cli_smb_state);
 293         struct cli_state *cli;
 294         struct tevent_req **pending;
 295         int num_pending;
 296         struct tevent_req *subreq;
 297
 298         cli = state->cli;
 299         num_pending = talloc_array_length(cli->pending);
 300
 301         pending = talloc_realloc(cli, cli->pending, struct tevent_req *,
 302                                  num_pending+1);
 303         if (pending == NULL) {
 304                 return false;
 305         }
 306         pending[num_pending] = req;
 307         cli->pending = pending;
 308         talloc_set_destructor(req, cli_smb_req_destructor);
 309
 310         if (num_pending > 0) {
 311                 return true;
 312         }
 313
 314         /*
 315          * We're the first ones, add the read_smb request that waits for the
 316          * answer from the server
 317          */
 318         subreq = read_smb_send(cli->pending, state->ev, cli->fd);
 319         if (subreq == NULL) {
 320                 cli_smb_req_unset_pending(req);
 321                 return false;
 322         }
 323         tevent_req_set_callback(subreq, cli_smb_received, cli);
 324         return true;
 325 }
 326
 327 /*
 328  * Fetch a smb request's mid. Only valid after the request has been sent by
 329  * cli_smb_req_send().
 330  */
 331 uint16_t cli_smb_req_mid(struct tevent_req *req)
 332 {
 333         struct cli_smb_state *state = tevent_req_data(
 334                 req, struct cli_smb_state);
 335         return SVAL(state->header, smb_mid);
 336 }
 337
 338 void cli_smb_req_set_mid(struct tevent_req *req, uint16_t mid)
 339 {
 340         struct cli_smb_state *state = tevent_req_data(
 341                 req, struct cli_smb_state);
 342         state->mid = mid;
 343 }
 344
 345 static size_t iov_len(const struct iovec *iov, int count)
 346 {
 347         size_t result = 0;
 348         int i;
 349         for (i=0; i<count; i++) {
 350                 result += iov[i].iov_len;
 351         }
 352         return result;
 353 }
 354
 355 static uint8_t *iov_concat(TALLOC_CTX *mem_ctx, const struct iovec *iov,
 356                            int count)
 357 {
 358         size_t len = iov_len(iov, count);
 359         size_t copied;
 360         uint8_t *buf;
 361         int i;
 362
 363         buf = talloc_array(mem_ctx, uint8_t, len);
 364         if (buf == NULL) {
 365                 return NULL;
 366         }
 367         copied = 0;
 368         for (i=0; i<count; i++) {
 369                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
 370                 copied += iov[i].iov_len;
 371         }
 372         return buf;
 373 }
 374
 375 struct tevent_req *cli_smb_req_create(TALLOC_CTX *mem_ctx,
 376                                       struct event_context *ev,
 377                                       struct cli_state *cli,
 378                                       uint8_t smb_command,
 379                                       uint8_t additional_flags,
 380                                       uint8_t wct, uint16_t *vwv,
 381                                       int iov_count,
 382                                       struct iovec *bytes_iov)
 383 {
 384         struct tevent_req *result;
 385         struct cli_smb_state *state;
 386         struct timeval endtime;
 387
 388         if (iov_count > MAX_SMB_IOV) {
 389                 /*
 390                  * Should not happen :-)
 391                  */
 392                 return NULL;
 393         }
 394
 395         result = tevent_req_create(mem_ctx, &state, struct cli_smb_state);
 396         if (result == NULL) {
 397                 return NULL;
 398         }
 399         state->ev = ev;
 400         state->cli = cli;
 401         state->mid = 0;         /* Set to auto-choose in cli_smb_req_send */
 402         state->chain_num = 0;
 403         state->chained_requests = NULL;
 404
 405         cli_setup_packet_buf(cli, (char *)state->header);
 406         SCVAL(state->header, smb_com, smb_command);
 407         SSVAL(state->header, smb_tid, cli->cnum);
 408         SCVAL(state->header, smb_wct, wct);
 409
 410         state->vwv = vwv;
 411
 412         SSVAL(state->bytecount_buf, 0, iov_len(bytes_iov, iov_count));
 413
 414         state->iov[0].iov_base = (void *)state->header;
 415         state->iov[0].iov_len  = sizeof(state->header);
 416         state->iov[1].iov_base = (void *)state->vwv;
 417         state->iov[1].iov_len  = wct * sizeof(uint16_t);
 418         state->iov[2].iov_base = (void *)state->bytecount_buf;
 419         state->iov[2].iov_len  = sizeof(uint16_t);
 420
 421         if (iov_count != 0) {
 422                 memcpy(&state->iov[3], bytes_iov,
 423                        iov_count * sizeof(*bytes_iov));
 424         }
 425         state->iov_count = iov_count + 3;
 426
 427         endtime = timeval_current_ofs(0, cli->timeout * 1000);
 428         if (!tevent_req_set_endtime(result, ev, endtime)) {
 429                 tevent_req_nomem(NULL, result);
 430         }
 431         return result;
 432 }
 433
 434 static NTSTATUS cli_signv(struct cli_state *cli, struct iovec *iov, int count,
 435                           uint32_t *seqnum)
 436 {
 437         uint8_t *buf;
 438
 439         /*
 440          * Obvious optimization: Make cli_calculate_sign_mac work with struct
 441          * iovec directly. MD5Update would do that just fine.
 442          */
 443
 444         if ((count <= 0) || (iov[0].iov_len < smb_wct)) {
 445                 return NT_STATUS_INVALID_PARAMETER;
 446         }
 447
 448         buf = iov_concat(talloc_tos(), iov, count);
 449         if (buf == NULL) {
 450                 return NT_STATUS_NO_MEMORY;
 451         }
 452
 453         cli_calculate_sign_mac(cli, (char *)buf, seqnum);
 454         memcpy(iov[0].iov_base, buf, iov[0].iov_len);
 455
 456         TALLOC_FREE(buf);
 457         return NT_STATUS_OK;
 458 }
 459
 460 static void cli_smb_sent(struct tevent_req *subreq);
 461
 462 static NTSTATUS cli_smb_req_iov_send(struct tevent_req *req,
 463                                      struct cli_smb_state *state,
 464                                      struct iovec *iov, int iov_count)
 465 {
 466         struct tevent_req *subreq;
 467         NTSTATUS status;
 468
 469         if (state->cli->fd == -1) {
 470                 return NT_STATUS_CONNECTION_INVALID;
 471         }
 472
 473         if (iov[0].iov_len < smb_wct) {
 474                 return NT_STATUS_INVALID_PARAMETER;
 475         }
 476
 477         if (state->mid != 0) {
 478                 SSVAL(iov[0].iov_base, smb_mid, state->mid);
 479         } else {
 480                 uint16_t mid = cli_alloc_mid(state->cli);
 481                 SSVAL(iov[0].iov_base, smb_mid, mid);
 482         }
 483
 484         smb_setlen((char *)iov[0].iov_base, iov_len(iov, iov_count) - 4);
 485
 486         status = cli_signv(state->cli, iov, iov_count, &state->seqnum);
 487
 488         if (!NT_STATUS_IS_OK(status)) {
 489                 return status;
 490         }
 491
 492         if (cli_encryption_on(state->cli)) {
 493                 char *buf, *enc_buf;
 494
 495                 buf = (char *)iov_concat(talloc_tos(), iov, iov_count);
 496                 if (buf == NULL) {
 497                         return NT_STATUS_NO_MEMORY;
 498                 }
 499                 status = cli_encrypt_message(state->cli, (char *)buf,
 500                                              &enc_buf);
 501                 TALLOC_FREE(buf);
 502                 if (!NT_STATUS_IS_OK(status)) {
 503                         DEBUG(0, ("Error in encrypting client message: %s\n",
 504                                   nt_errstr(status)));
 505                         return status;
 506                 }
 507                 buf = (char *)talloc_memdup(state, enc_buf,
 508                                             smb_len(enc_buf)+4);
 509                 SAFE_FREE(enc_buf);
 510                 if (buf == NULL) {
 511                         return NT_STATUS_NO_MEMORY;
 512                 }
 513                 iov[0].iov_base = (void *)buf;
 514                 iov[0].iov_len = talloc_get_size(buf);
 515                 iov_count = 1;
 516         }
 517         subreq = writev_send(state, state->ev, state->cli->outgoing,
 518                              state->cli->fd, false, iov, iov_count);
 519         if (subreq == NULL) {
 520                 return NT_STATUS_NO_MEMORY;
 521         }
 522         tevent_req_set_callback(subreq, cli_smb_sent, req);
 523         return NT_STATUS_OK;
 524 }
 525
 526 NTSTATUS cli_smb_req_send(struct tevent_req *req)
 527 {
 528         struct cli_smb_state *state = tevent_req_data(
 529                 req, struct cli_smb_state);
 530
 531         return cli_smb_req_iov_send(req, state, state->iov, state->iov_count);
 532 }
 533
 534 struct tevent_req *cli_smb_send(TALLOC_CTX *mem_ctx,
 535                                 struct event_context *ev,
 536                                 struct cli_state *cli,
 537                                 uint8_t smb_command,
 538                                 uint8_t additional_flags,
 539                                 uint8_t wct, uint16_t *vwv,
 540                                 uint32_t num_bytes,
 541                                 const uint8_t *bytes)
 542 {
 543         struct tevent_req *req;
 544         struct iovec iov;
 545         NTSTATUS status;
 546
 547         iov.iov_base = CONST_DISCARD(void *, bytes);
 548         iov.iov_len = num_bytes;
 549
 550         req = cli_smb_req_create(mem_ctx, ev, cli, smb_command,
 551                                  additional_flags, wct, vwv, 1, &iov);
 552         if (req == NULL) {
 553                 return NULL;
 554         }
 555
 556         status = cli_smb_req_send(req);
 557         if (!NT_STATUS_IS_OK(status)) {
 558                 tevent_req_nterror(req, status);
 559                 return tevent_req_post(req, ev);
 560         }
 561         return req;
 562 }
 563
 564 static void cli_smb_sent(struct tevent_req *subreq)
 565 {
 566         struct tevent_req *req = tevent_req_callback_data(
 567                 subreq, struct tevent_req);
 568         struct cli_smb_state *state = tevent_req_data(
 569                 req, struct cli_smb_state);
 570         ssize_t nwritten;
 571         int err;
 572
 573         nwritten = writev_recv(subreq, &err);
 574         TALLOC_FREE(subreq);
 575         if (nwritten == -1) {
 576                 if (state->cli->fd != -1) {
 577                         close(state->cli->fd);
 578                         state->cli->fd = -1;
 579                 }
 580                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 581                 return;
 582         }
 583
 584         switch (CVAL(state->header, smb_com)) {
 585         case SMBtranss:
 586         case SMBtranss2:
 587         case SMBnttranss:
 588         case SMBntcancel:
 589                 state->inbuf = NULL;
 590                 tevent_req_done(req);
 591                 return;
 592         case SMBlockingX:
 593                 if ((CVAL(state->header, smb_wct) == 8) &&
 594                     (CVAL(state->vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
 595                         state->inbuf = NULL;
 596                         tevent_req_done(req);
 597                         return;
 598                 }
 599         }
 600
 601         if (!cli_smb_req_set_pending(req)) {
 602                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 603                 return;
 604         }
 605 }
 606
 607 static void cli_smb_received(struct tevent_req *subreq)
 608 {
 609         struct cli_state *cli = tevent_req_callback_data(
 610                 subreq, struct cli_state);
 611         struct tevent_req *req;
 612         struct cli_smb_state *state;
 613         NTSTATUS status;
 614         uint8_t *inbuf;
 615         ssize_t received;
 616         int num_pending;
 617         int i, err;
 618         uint16_t mid;
 619         bool oplock_break;
 620
 621         received = read_smb_recv(subreq, talloc_tos(), &inbuf, &err);
 622         TALLOC_FREE(subreq);
 623         if (received == -1) {
 624                 if (cli->fd != -1) {
 625                         close(cli->fd);
 626                         cli->fd = -1;
 627                 }
 628                 status = map_nt_error_from_unix(err);
 629                 goto fail;
 630         }
 631
 632         if ((IVAL(inbuf, 4) != 0x424d53ff) /* 0xFF"SMB" */
 633             && (SVAL(inbuf, 4) != 0x45ff)) /* 0xFF"E" */ {
 634                 DEBUG(10, ("Got non-SMB PDU\n"));
 635                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 636                 goto fail;
 637         }
 638
 639         if (cli_encryption_on(cli) && (CVAL(inbuf, 0) == 0)) {
 640                 uint16_t enc_ctx_num;
 641
 642                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
 643                 if (!NT_STATUS_IS_OK(status)) {
 644                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
 645                                    nt_errstr(status)));
 646                         goto fail;
 647                 }
 648
 649                 if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
 650                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
 651                                    enc_ctx_num,
 652                                    cli->trans_enc_state->enc_ctx_num));
 653                         status = NT_STATUS_INVALID_HANDLE;
 654                         goto fail;
 655                 }
 656
 657                 status = common_decrypt_buffer(cli->trans_enc_state,
 658                                                (char *)inbuf);
 659                 if (!NT_STATUS_IS_OK(status)) {
 660                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
 661                                    nt_errstr(status)));
 662                         goto fail;
 663                 }
 664         }
 665
 666         mid = SVAL(inbuf, smb_mid);
 667         num_pending = talloc_array_length(cli->pending);
 668
 669         for (i=0; i<num_pending; i++) {
 670                 if (mid == cli_smb_req_mid(cli->pending[i])) {
 671                         break;
 672                 }
 673         }
 674         if (i == num_pending) {
 675                 /* Dump unexpected reply */
 676                 TALLOC_FREE(inbuf);
 677                 goto done;
 678         }
 679
 680         oplock_break = false;
 681
 682         if (mid == 0xffff) {
 683                 /*
 684                  * Paranoia checks that this is really an oplock break request.
 685                  */
 686                 oplock_break = (smb_len(inbuf) == 51); /* hdr + 8 words */
 687                 oplock_break &= ((CVAL(inbuf, smb_flg) & FLAG_REPLY) == 0);
 688                 oplock_break &= (CVAL(inbuf, smb_com) == SMBlockingX);
 689                 oplock_break &= (SVAL(inbuf, smb_vwv6) == 0);
 690                 oplock_break &= (SVAL(inbuf, smb_vwv7) == 0);
 691
 692                 if (!oplock_break) {
 693                         /* Dump unexpected reply */
 694                         TALLOC_FREE(inbuf);
 695                         goto done;
 696                 }
 697         }
 698
 699         req = cli->pending[i];
 700         state = tevent_req_data(req, struct cli_smb_state);
 701
 702         if (!oplock_break /* oplock breaks are not signed */
 703             && !cli_check_sign_mac(cli, (char *)inbuf, state->seqnum+1)) {
 704                 DEBUG(10, ("cli_check_sign_mac failed\n"));
 705                 TALLOC_FREE(inbuf);
 706                 status = NT_STATUS_ACCESS_DENIED;
 707                 goto fail;
 708         }
 709
 710         if (state->chained_requests == NULL) {
 711                 state->inbuf = talloc_move(state, &inbuf);
 712                 talloc_set_destructor(req, NULL);
 713                 cli_smb_req_destructor(req);
 714                 state->chain_num = 0;
 715                 state->chain_length = 1;
 716                 tevent_req_done(req);
 717         } else {
 718                 struct tevent_req **chain = talloc_move(
 719                         talloc_tos(), &state->chained_requests);
 720                 int num_chained = talloc_array_length(chain);
 721
 722                 for (i=0; i<num_chained; i++) {
 723                         state = tevent_req_data(chain[i], struct
 724                                                 cli_smb_state);
 725                         state->inbuf = inbuf;
 726                         state->chain_num = i;
 727                         state->chain_length = num_chained;
 728                         tevent_req_done(chain[i]);
 729                 }
 730                 TALLOC_FREE(inbuf);
 731                 TALLOC_FREE(chain);
 732         }
 733  done:
 734         if (talloc_array_length(cli->pending) > 0) {
 735                 /*
 736                  * Set up another read request for the other pending cli_smb
 737                  * requests
 738                  */
 739                 state = tevent_req_data(cli->pending[0], struct cli_smb_state);
 740                 subreq = read_smb_send(cli->pending, state->ev, cli->fd);
 741                 if (subreq == NULL) {
 742                         status = NT_STATUS_NO_MEMORY;
 743                         goto fail;
 744                 }
 745                 tevent_req_set_callback(subreq, cli_smb_received, cli);
 746         }
 747         return;
 748  fail:
 749         /*
 750          * Cancel all pending requests. We don't do a for-loop walking
 751          * cli->pending because that array changes in
 752          * cli_smb_req_destructor().
 753          */
 754         while (talloc_array_length(cli->pending) > 0) {
 755                 req = cli->pending[0];
 756                 talloc_set_destructor(req, NULL);
 757                 cli_smb_req_destructor(req);
 758                 tevent_req_nterror(req, status);
 759         }
 760 }
 761
 762 NTSTATUS cli_smb_recv(struct tevent_req *req,
 763                       TALLOC_CTX *mem_ctx, uint8_t **pinbuf,
 764                       uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 765                       uint32_t *pnum_bytes, uint8_t **pbytes)
 766 {
 767         struct cli_smb_state *state = tevent_req_data(
 768                 req, struct cli_smb_state);
 769         NTSTATUS status = NT_STATUS_OK;
 770         uint8_t cmd, wct;
 771         uint16_t num_bytes;
 772         size_t wct_ofs, bytes_offset;
 773         int i;
 774
 775         if (tevent_req_is_nterror(req, &status)) {
 776                 return status;
 777         }
 778
 779         if (state->inbuf == NULL) {
 780                 /* This was a request without a reply */
 781                 return NT_STATUS_OK;
 782         }
 783
 784         wct_ofs = smb_wct;
 785         cmd = CVAL(state->inbuf, smb_com);
 786
 787         for (i=0; i<state->chain_num; i++) {
 788                 if (i < state->chain_num-1) {
 789                         if (cmd == 0xff) {
 790                                 return NT_STATUS_REQUEST_ABORTED;
 791                         }
 792                         if (!is_andx_req(cmd)) {
 793                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 794                         }
 795                 }
 796
 797                 if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
 798                         /*
 799                          * This request was not completed because a previous
 800                          * request in the chain had received an error.
 801                          */
 802                         return NT_STATUS_REQUEST_ABORTED;
 803                 }
 804
 805                 wct_ofs = SVAL(state->inbuf, wct_ofs + 3);
 806
 807                 /*
 808                  * Skip the all-present length field. No overflow, we've just
 809                  * put a 16-bit value into a size_t.
 810                  */
 811                 wct_ofs += 4;
 812
 813                 if (wct_ofs+2 > talloc_get_size(state->inbuf)) {
 814                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 815                 }
 816
 817                 cmd = CVAL(state->inbuf, wct_ofs + 1);
 818         }
 819
 820         status = cli_pull_error((char *)state->inbuf);
 821
 822         if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
 823
 824                 if ((cmd == SMBsesssetupX)
 825                     && NT_STATUS_EQUAL(
 826                             status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 827                         /*
 828                          * NT_STATUS_MORE_PROCESSING_REQUIRED is a
 829                          * valid return code for session setup
 830                          */
 831                         goto no_err;
 832                 }
 833
 834                 if (NT_STATUS_IS_ERR(status)) {
 835                         /*
 836                          * The last command takes the error code. All
 837                          * further commands down the requested chain
 838                          * will get a NT_STATUS_REQUEST_ABORTED.
 839                          */
 840                         return status;
 841                 }
 842         }
 843
 844 no_err:
 845
 846         wct = CVAL(state->inbuf, wct_ofs);
 847         bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
 848         num_bytes = SVAL(state->inbuf, bytes_offset);
 849
 850         if (wct < min_wct) {
 851                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 852         }
 853
 854         /*
 855          * wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
 856          * is a 16-bit value. So bytes_offset being size_t should be far from
 857          * wrapping.
 858          */
 859         if ((bytes_offset + 2 > talloc_get_size(state->inbuf))
 860             || (bytes_offset > 0xffff)) {
 861                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 862         }
 863
 864         if (pwct != NULL) {
 865                 *pwct = wct;
 866         }
 867         if (pvwv != NULL) {
 868                 *pvwv = (uint16_t *)(state->inbuf + wct_ofs + 1);
 869         }
 870         if (pnum_bytes != NULL) {
 871                 *pnum_bytes = num_bytes;
 872         }
 873         if (pbytes != NULL) {
 874                 *pbytes = (uint8_t *)state->inbuf + bytes_offset + 2;
 875         }
 876         if ((mem_ctx != NULL) && (pinbuf != NULL)) {
 877                 if (state->chain_num == state->chain_length-1) {
 878                         *pinbuf = talloc_move(mem_ctx, &state->inbuf);
 879                 } else {
 880                         *pinbuf = state->inbuf;
 881                 }
 882         }
 883
 884         return status;
 885 }
 886
 887 size_t cli_smb_wct_ofs(struct tevent_req **reqs, int num_reqs)
 888 {
 889         size_t wct_ofs;
 890         int i;
 891
 892         wct_ofs = smb_wct - 4;
 893
 894         for (i=0; i<num_reqs; i++) {
 895                 struct cli_smb_state *state;
 896                 state = tevent_req_data(reqs[i], struct cli_smb_state);
 897                 wct_ofs += iov_len(state->iov+1, state->iov_count-1);
 898                 wct_ofs = (wct_ofs + 3) & ~3;
 899         }
 900         return wct_ofs;
 901 }
 902
 903 NTSTATUS cli_smb_chain_send(struct tevent_req **reqs, int num_reqs)
 904 {
 905         struct cli_smb_state *first_state = tevent_req_data(
 906                 reqs[0], struct cli_smb_state);
 907         struct cli_smb_state *last_state = tevent_req_data(
 908                 reqs[num_reqs-1], struct cli_smb_state);
 909         struct cli_smb_state *state;
 910         size_t wct_offset;
 911         size_t chain_padding = 0;
 912         int i, iovlen;
 913         struct iovec *iov = NULL;
 914         struct iovec *this_iov;
 915         NTSTATUS status;
 916
 917         iovlen = 0;
 918         for (i=0; i<num_reqs; i++) {
 919                 state = tevent_req_data(reqs[i], struct cli_smb_state);
 920                 iovlen += state->iov_count;
 921         }
 922
 923         iov = talloc_array(last_state, struct iovec, iovlen);
 924         if (iov == NULL) {
 925                 return NT_STATUS_NO_MEMORY;
 926         }
 927
 928         first_state->chained_requests = (struct tevent_req **)talloc_memdup(
 929                 last_state, reqs, sizeof(*reqs) * num_reqs);
 930         if (first_state->chained_requests == NULL) {
 931                 TALLOC_FREE(iov);
 932                 return NT_STATUS_NO_MEMORY;
 933         }
 934
 935         wct_offset = smb_wct - 4;
 936         this_iov = iov;
 937
 938         for (i=0; i<num_reqs; i++) {
 939                 size_t next_padding = 0;
 940                 uint16_t *vwv;
 941
 942                 state = tevent_req_data(reqs[i], struct cli_smb_state);
 943
 944                 if (i < num_reqs-1) {
 945                         if (!is_andx_req(CVAL(state->header, smb_com))
 946                             || CVAL(state->header, smb_wct) < 2) {
 947                                 TALLOC_FREE(iov);
 948                                 TALLOC_FREE(first_state->chained_requests);
 949                                 return NT_STATUS_INVALID_PARAMETER;
 950                         }
 951                 }
 952
 953                 wct_offset += iov_len(state->iov+1, state->iov_count-1) + 1;
 954                 if ((wct_offset % 4) != 0) {
 955                         next_padding = 4 - (wct_offset % 4);
 956                 }
 957                 wct_offset += next_padding;
 958                 vwv = state->vwv;
 959
 960                 if (i < num_reqs-1) {
 961                         struct cli_smb_state *next_state = tevent_req_data(
 962                                 reqs[i+1], struct cli_smb_state);
 963                         SCVAL(vwv+0, 0, CVAL(next_state->header, smb_com));
 964                         SCVAL(vwv+0, 1, 0);
 965                         SSVAL(vwv+1, 0, wct_offset);
 966                 } else if (is_andx_req(CVAL(state->header, smb_com))) {
 967                         /* properly end the chain */
 968                         SCVAL(vwv+0, 0, 0xff);
 969                         SCVAL(vwv+0, 1, 0xff);
 970                         SSVAL(vwv+1, 0, 0);
 971                 }
 972
 973                 if (i == 0) {
 974                         this_iov[0] = state->iov[0];
 975                 } else {
 976                         /*
 977                          * This one is a bit subtle. We have to add
 978                          * chain_padding bytes between the requests, and we
 979                          * have to also include the wct field of the
 980                          * subsequent requests. We use the subsequent header
 981                          * for the padding, it contains the wct field in its
 982                          * last byte.
 983                          */
 984                         this_iov[0].iov_len = chain_padding+1;
 985                         this_iov[0].iov_base = (void *)&state->header[
 986                                 sizeof(state->header) - this_iov[0].iov_len];
 987                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
 988                 }
 989                 memcpy(this_iov+1, state->iov+1,
 990                        sizeof(struct iovec) * (state->iov_count-1));
 991                 this_iov += state->iov_count;
 992                 chain_padding = next_padding;
 993         }
 994
 995         status = cli_smb_req_iov_send(reqs[0], last_state, iov, iovlen);
 996         if (!NT_STATUS_IS_OK(status)) {
 997                 TALLOC_FREE(iov);
 998                 TALLOC_FREE(first_state->chained_requests);
 999                 return status;
1000         }
1001
1002         return NT_STATUS_OK;
1003 }
1004
1005 uint8_t *cli_smb_inbuf(struct tevent_req *req)
1006 {
1007         struct cli_smb_state *state = tevent_req_data(
1008                 req, struct cli_smb_state);
1009         return state->inbuf;
1010 }
1011
1012 bool cli_has_async_calls(struct cli_state *cli)
1013 {
1014         return ((tevent_queue_length(cli->outgoing) != 0)
1015                 || (talloc_array_length(cli->pending) != 0));
1016 }
1017
1018 struct cli_smb_oplock_break_waiter_state {
1019         uint16_t fnum;
1020         uint8_t level;
1021 };
1022
1023 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq);
1024
1025 struct tevent_req *cli_smb_oplock_break_waiter_send(TALLOC_CTX *mem_ctx,
1026                                                     struct event_context *ev,
1027                                                     struct cli_state *cli)
1028 {
1029         struct tevent_req *req, *subreq;
1030         struct cli_smb_oplock_break_waiter_state *state;
1031         struct cli_smb_state *smb_state;
1032
1033         req = tevent_req_create(mem_ctx, &state,
1034                                 struct cli_smb_oplock_break_waiter_state);
1035         if (req == NULL) {
1036                 return NULL;
1037         }
1038
1039         /*
1040          * Create a fake SMB request that we will never send out. This is only
1041          * used to be set into the pending queue with the right mid.
1042          */
1043         subreq = cli_smb_req_create(mem_ctx, ev, cli, 0, 0, 0, NULL, 0, NULL);
1044         if (tevent_req_nomem(subreq, req)) {
1045                 return tevent_req_post(req, ev);
1046         }
1047         smb_state = tevent_req_data(subreq, struct cli_smb_state);
1048         SSVAL(smb_state->header, smb_mid, 0xffff);
1049
1050         if (!cli_smb_req_set_pending(subreq)) {
1051                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1052                 return tevent_req_post(req, ev);
1053         }
1054         tevent_req_set_callback(subreq, cli_smb_oplock_break_waiter_done, req);
1055         return req;
1056 }
1057
1058 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq)
1059 {
1060         struct tevent_req *req = tevent_req_callback_data(
1061                 subreq, struct tevent_req);
1062         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
1063                 req, struct cli_smb_oplock_break_waiter_state);
1064         uint8_t wct;
1065         uint16_t *vwv;
1066         uint32_t num_bytes;
1067         uint8_t *bytes;
1068         uint8_t *inbuf;
1069         NTSTATUS status;
1070
1071         status = cli_smb_recv(subreq, state, &inbuf, 8, &wct, &vwv,
1072                               &num_bytes, &bytes);
1073         TALLOC_FREE(subreq);
1074         if (!NT_STATUS_IS_OK(status)) {
1075                 tevent_req_nterror(req, status);
1076                 return;
1077         }
1078         state->fnum = SVAL(vwv+2, 0);
1079         state->level = CVAL(vwv+3, 1);
1080         tevent_req_done(req);
1081 }
1082
1083 NTSTATUS cli_smb_oplock_break_waiter_recv(struct tevent_req *req,
1084                                           uint16_t *pfnum,
1085                                           uint8_t *plevel)
1086 {
1087         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
1088                 req, struct cli_smb_oplock_break_waiter_state);
1089         NTSTATUS status;
1090
1091         if (tevent_req_is_nterror(req, &status)) {
1092                 return status;
1093         }
1094         *pfnum = state->fnum;
1095         *plevel = state->level;
1096         return NT_STATUS_OK;
1097 }