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         if (cli->timeout) {
 428                 endtime = timeval_current_ofs(0, cli->timeout * 1000);
 429                 if (!tevent_req_set_endtime(result, ev, endtime)) {
 430                         tevent_req_nomem(NULL, result);
 431                 }
 432         }
 433         return result;
 434 }
 435
 436 static NTSTATUS cli_signv(struct cli_state *cli, struct iovec *iov, int count,
 437                           uint32_t *seqnum)
 438 {
 439         uint8_t *buf;
 440
 441         /*
 442          * Obvious optimization: Make cli_calculate_sign_mac work with struct
 443          * iovec directly. MD5Update would do that just fine.
 444          */
 445
 446         if ((count <= 0) || (iov[0].iov_len < smb_wct)) {
 447                 return NT_STATUS_INVALID_PARAMETER;
 448         }
 449
 450         buf = iov_concat(talloc_tos(), iov, count);
 451         if (buf == NULL) {
 452                 return NT_STATUS_NO_MEMORY;
 453         }
 454
 455         cli_calculate_sign_mac(cli, (char *)buf, seqnum);
 456         memcpy(iov[0].iov_base, buf, iov[0].iov_len);
 457
 458         TALLOC_FREE(buf);
 459         return NT_STATUS_OK;
 460 }
 461
 462 static void cli_smb_sent(struct tevent_req *subreq);
 463
 464 static NTSTATUS cli_smb_req_iov_send(struct tevent_req *req,
 465                                      struct cli_smb_state *state,
 466                                      struct iovec *iov, int iov_count)
 467 {
 468         struct tevent_req *subreq;
 469         NTSTATUS status;
 470
 471         if (state->cli->fd == -1) {
 472                 return NT_STATUS_CONNECTION_INVALID;
 473         }
 474
 475         if (iov[0].iov_len < smb_wct) {
 476                 return NT_STATUS_INVALID_PARAMETER;
 477         }
 478
 479         if (state->mid != 0) {
 480                 SSVAL(iov[0].iov_base, smb_mid, state->mid);
 481         } else {
 482                 uint16_t mid = cli_alloc_mid(state->cli);
 483                 SSVAL(iov[0].iov_base, smb_mid, mid);
 484         }
 485
 486         smb_setlen((char *)iov[0].iov_base, iov_len(iov, iov_count) - 4);
 487
 488         status = cli_signv(state->cli, iov, iov_count, &state->seqnum);
 489
 490         if (!NT_STATUS_IS_OK(status)) {
 491                 return status;
 492         }
 493
 494         if (cli_encryption_on(state->cli)) {
 495                 char *buf, *enc_buf;
 496
 497                 buf = (char *)iov_concat(talloc_tos(), iov, iov_count);
 498                 if (buf == NULL) {
 499                         return NT_STATUS_NO_MEMORY;
 500                 }
 501                 status = cli_encrypt_message(state->cli, (char *)buf,
 502                                              &enc_buf);
 503                 TALLOC_FREE(buf);
 504                 if (!NT_STATUS_IS_OK(status)) {
 505                         DEBUG(0, ("Error in encrypting client message: %s\n",
 506                                   nt_errstr(status)));
 507                         return status;
 508                 }
 509                 buf = (char *)talloc_memdup(state, enc_buf,
 510                                             smb_len(enc_buf)+4);
 511                 SAFE_FREE(enc_buf);
 512                 if (buf == NULL) {
 513                         return NT_STATUS_NO_MEMORY;
 514                 }
 515                 iov[0].iov_base = (void *)buf;
 516                 iov[0].iov_len = talloc_get_size(buf);
 517                 iov_count = 1;
 518         }
 519         subreq = writev_send(state, state->ev, state->cli->outgoing,
 520                              state->cli->fd, false, iov, iov_count);
 521         if (subreq == NULL) {
 522                 return NT_STATUS_NO_MEMORY;
 523         }
 524         tevent_req_set_callback(subreq, cli_smb_sent, req);
 525         return NT_STATUS_OK;
 526 }
 527
 528 NTSTATUS cli_smb_req_send(struct tevent_req *req)
 529 {
 530         struct cli_smb_state *state = tevent_req_data(
 531                 req, struct cli_smb_state);
 532
 533         return cli_smb_req_iov_send(req, state, state->iov, state->iov_count);
 534 }
 535
 536 struct tevent_req *cli_smb_send(TALLOC_CTX *mem_ctx,
 537                                 struct event_context *ev,
 538                                 struct cli_state *cli,
 539                                 uint8_t smb_command,
 540                                 uint8_t additional_flags,
 541                                 uint8_t wct, uint16_t *vwv,
 542                                 uint32_t num_bytes,
 543                                 const uint8_t *bytes)
 544 {
 545         struct tevent_req *req;
 546         struct iovec iov;
 547         NTSTATUS status;
 548
 549         iov.iov_base = CONST_DISCARD(void *, bytes);
 550         iov.iov_len = num_bytes;
 551
 552         req = cli_smb_req_create(mem_ctx, ev, cli, smb_command,
 553                                  additional_flags, wct, vwv, 1, &iov);
 554         if (req == NULL) {
 555                 return NULL;
 556         }
 557
 558         status = cli_smb_req_send(req);
 559         if (!NT_STATUS_IS_OK(status)) {
 560                 tevent_req_nterror(req, status);
 561                 return tevent_req_post(req, ev);
 562         }
 563         return req;
 564 }
 565
 566 static void cli_smb_sent(struct tevent_req *subreq)
 567 {
 568         struct tevent_req *req = tevent_req_callback_data(
 569                 subreq, struct tevent_req);
 570         struct cli_smb_state *state = tevent_req_data(
 571                 req, struct cli_smb_state);
 572         ssize_t nwritten;
 573         int err;
 574
 575         nwritten = writev_recv(subreq, &err);
 576         TALLOC_FREE(subreq);
 577         if (nwritten == -1) {
 578                 if (state->cli->fd != -1) {
 579                         close(state->cli->fd);
 580                         state->cli->fd = -1;
 581                 }
 582                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 583                 return;
 584         }
 585
 586         switch (CVAL(state->header, smb_com)) {
 587         case SMBtranss:
 588         case SMBtranss2:
 589         case SMBnttranss:
 590         case SMBntcancel:
 591                 state->inbuf = NULL;
 592                 tevent_req_done(req);
 593                 return;
 594         case SMBlockingX:
 595                 if ((CVAL(state->header, smb_wct) == 8) &&
 596                     (CVAL(state->vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
 597                         state->inbuf = NULL;
 598                         tevent_req_done(req);
 599                         return;
 600                 }
 601         }
 602
 603         if (!cli_smb_req_set_pending(req)) {
 604                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 605                 return;
 606         }
 607 }
 608
 609 static void cli_smb_received(struct tevent_req *subreq)
 610 {
 611         struct cli_state *cli = tevent_req_callback_data(
 612                 subreq, struct cli_state);
 613         struct tevent_req *req;
 614         struct cli_smb_state *state;
 615         NTSTATUS status;
 616         uint8_t *inbuf;
 617         ssize_t received;
 618         int num_pending;
 619         int i, err;
 620         uint16_t mid;
 621         bool oplock_break;
 622
 623         received = read_smb_recv(subreq, talloc_tos(), &inbuf, &err);
 624         TALLOC_FREE(subreq);
 625         if (received == -1) {
 626                 if (cli->fd != -1) {
 627                         close(cli->fd);
 628                         cli->fd = -1;
 629                 }
 630                 status = map_nt_error_from_unix(err);
 631                 goto fail;
 632         }
 633
 634         if ((IVAL(inbuf, 4) != 0x424d53ff) /* 0xFF"SMB" */
 635             && (SVAL(inbuf, 4) != 0x45ff)) /* 0xFF"E" */ {
 636                 DEBUG(10, ("Got non-SMB PDU\n"));
 637                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 638                 goto fail;
 639         }
 640
 641         if (cli_encryption_on(cli) && (CVAL(inbuf, 0) == 0)) {
 642                 uint16_t enc_ctx_num;
 643
 644                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
 645                 if (!NT_STATUS_IS_OK(status)) {
 646                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
 647                                    nt_errstr(status)));
 648                         goto fail;
 649                 }
 650
 651                 if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
 652                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
 653                                    enc_ctx_num,
 654                                    cli->trans_enc_state->enc_ctx_num));
 655                         status = NT_STATUS_INVALID_HANDLE;
 656                         goto fail;
 657                 }
 658
 659                 status = common_decrypt_buffer(cli->trans_enc_state,
 660                                                (char *)inbuf);
 661                 if (!NT_STATUS_IS_OK(status)) {
 662                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
 663                                    nt_errstr(status)));
 664                         goto fail;
 665                 }
 666         }
 667
 668         mid = SVAL(inbuf, smb_mid);
 669         num_pending = talloc_array_length(cli->pending);
 670
 671         for (i=0; i<num_pending; i++) {
 672                 if (mid == cli_smb_req_mid(cli->pending[i])) {
 673                         break;
 674                 }
 675         }
 676         if (i == num_pending) {
 677                 /* Dump unexpected reply */
 678                 TALLOC_FREE(inbuf);
 679                 goto done;
 680         }
 681
 682         oplock_break = false;
 683
 684         if (mid == 0xffff) {
 685                 /*
 686                  * Paranoia checks that this is really an oplock break request.
 687                  */
 688                 oplock_break = (smb_len(inbuf) == 51); /* hdr + 8 words */
 689                 oplock_break &= ((CVAL(inbuf, smb_flg) & FLAG_REPLY) == 0);
 690                 oplock_break &= (CVAL(inbuf, smb_com) == SMBlockingX);
 691                 oplock_break &= (SVAL(inbuf, smb_vwv6) == 0);
 692                 oplock_break &= (SVAL(inbuf, smb_vwv7) == 0);
 693
 694                 if (!oplock_break) {
 695                         /* Dump unexpected reply */
 696                         TALLOC_FREE(inbuf);
 697                         goto done;
 698                 }
 699         }
 700
 701         req = cli->pending[i];
 702         state = tevent_req_data(req, struct cli_smb_state);
 703
 704         if (!oplock_break /* oplock breaks are not signed */
 705             && !cli_check_sign_mac(cli, (char *)inbuf, state->seqnum+1)) {
 706                 DEBUG(10, ("cli_check_sign_mac failed\n"));
 707                 TALLOC_FREE(inbuf);
 708                 status = NT_STATUS_ACCESS_DENIED;
 709                 goto fail;
 710         }
 711
 712         if (state->chained_requests == NULL) {
 713                 state->inbuf = talloc_move(state, &inbuf);
 714                 talloc_set_destructor(req, NULL);
 715                 cli_smb_req_destructor(req);
 716                 state->chain_num = 0;
 717                 state->chain_length = 1;
 718                 tevent_req_done(req);
 719         } else {
 720                 struct tevent_req **chain = talloc_move(
 721                         talloc_tos(), &state->chained_requests);
 722                 int num_chained = talloc_array_length(chain);
 723
 724                 for (i=0; i<num_chained; i++) {
 725                         state = tevent_req_data(chain[i], struct
 726                                                 cli_smb_state);
 727                         state->inbuf = inbuf;
 728                         state->chain_num = i;
 729                         state->chain_length = num_chained;
 730                         tevent_req_done(chain[i]);
 731                 }
 732                 TALLOC_FREE(inbuf);
 733                 TALLOC_FREE(chain);
 734         }
 735  done:
 736         if (talloc_array_length(cli->pending) > 0) {
 737                 /*
 738                  * Set up another read request for the other pending cli_smb
 739                  * requests
 740                  */
 741                 state = tevent_req_data(cli->pending[0], struct cli_smb_state);
 742                 subreq = read_smb_send(cli->pending, state->ev, cli->fd);
 743                 if (subreq == NULL) {
 744                         status = NT_STATUS_NO_MEMORY;
 745                         goto fail;
 746                 }
 747                 tevent_req_set_callback(subreq, cli_smb_received, cli);
 748         }
 749         return;
 750  fail:
 751         /*
 752          * Cancel all pending requests. We don't do a for-loop walking
 753          * cli->pending because that array changes in
 754          * cli_smb_req_destructor().
 755          */
 756         while (talloc_array_length(cli->pending) > 0) {
 757                 req = cli->pending[0];
 758                 talloc_set_destructor(req, NULL);
 759                 cli_smb_req_destructor(req);
 760                 tevent_req_nterror(req, status);
 761         }
 762 }
 763
 764 NTSTATUS cli_smb_recv(struct tevent_req *req,
 765                       TALLOC_CTX *mem_ctx, uint8_t **pinbuf,
 766                       uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 767                       uint32_t *pnum_bytes, uint8_t **pbytes)
 768 {
 769         struct cli_smb_state *state = tevent_req_data(
 770                 req, struct cli_smb_state);
 771         NTSTATUS status = NT_STATUS_OK;
 772         uint8_t cmd, wct;
 773         uint16_t num_bytes;
 774         size_t wct_ofs, bytes_offset;
 775         int i;
 776
 777         if (tevent_req_is_nterror(req, &status)) {
 778                 return status;
 779         }
 780
 781         if (state->inbuf == NULL) {
 782                 /* This was a request without a reply */
 783                 return NT_STATUS_OK;
 784         }
 785
 786         wct_ofs = smb_wct;
 787         cmd = CVAL(state->inbuf, smb_com);
 788
 789         for (i=0; i<state->chain_num; i++) {
 790                 if (i < state->chain_num-1) {
 791                         if (cmd == 0xff) {
 792                                 return NT_STATUS_REQUEST_ABORTED;
 793                         }
 794                         if (!is_andx_req(cmd)) {
 795                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 796                         }
 797                 }
 798
 799                 if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
 800                         /*
 801                          * This request was not completed because a previous
 802                          * request in the chain had received an error.
 803                          */
 804                         return NT_STATUS_REQUEST_ABORTED;
 805                 }
 806
 807                 wct_ofs = SVAL(state->inbuf, wct_ofs + 3);
 808
 809                 /*
 810                  * Skip the all-present length field. No overflow, we've just
 811                  * put a 16-bit value into a size_t.
 812                  */
 813                 wct_ofs += 4;
 814
 815                 if (wct_ofs+2 > talloc_get_size(state->inbuf)) {
 816                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 817                 }
 818
 819                 cmd = CVAL(state->inbuf, wct_ofs + 1);
 820         }
 821
 822         status = cli_pull_error((char *)state->inbuf);
 823
 824         if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
 825
 826                 if ((cmd == SMBsesssetupX)
 827                     && NT_STATUS_EQUAL(
 828                             status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 829                         /*
 830                          * NT_STATUS_MORE_PROCESSING_REQUIRED is a
 831                          * valid return code for session setup
 832                          */
 833                         goto no_err;
 834                 }
 835
 836                 if (NT_STATUS_IS_ERR(status)) {
 837                         /*
 838                          * The last command takes the error code. All
 839                          * further commands down the requested chain
 840                          * will get a NT_STATUS_REQUEST_ABORTED.
 841                          */
 842                         return status;
 843                 }
 844         }
 845
 846 no_err:
 847
 848         wct = CVAL(state->inbuf, wct_ofs);
 849         bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
 850         num_bytes = SVAL(state->inbuf, bytes_offset);
 851
 852         if (wct < min_wct) {
 853                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 854         }
 855
 856         /*
 857          * wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
 858          * is a 16-bit value. So bytes_offset being size_t should be far from
 859          * wrapping.
 860          */
 861         if ((bytes_offset + 2 > talloc_get_size(state->inbuf))
 862             || (bytes_offset > 0xffff)) {
 863                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 864         }
 865
 866         if (pwct != NULL) {
 867                 *pwct = wct;
 868         }
 869         if (pvwv != NULL) {
 870                 *pvwv = (uint16_t *)(state->inbuf + wct_ofs + 1);
 871         }
 872         if (pnum_bytes != NULL) {
 873                 *pnum_bytes = num_bytes;
 874         }
 875         if (pbytes != NULL) {
 876                 *pbytes = (uint8_t *)state->inbuf + bytes_offset + 2;
 877         }
 878         if ((mem_ctx != NULL) && (pinbuf != NULL)) {
 879                 if (state->chain_num == state->chain_length-1) {
 880                         *pinbuf = talloc_move(mem_ctx, &state->inbuf);
 881                 } else {
 882                         *pinbuf = state->inbuf;
 883                 }
 884         }
 885
 886         return status;
 887 }
 888
 889 size_t cli_smb_wct_ofs(struct tevent_req **reqs, int num_reqs)
 890 {
 891         size_t wct_ofs;
 892         int i;
 893
 894         wct_ofs = smb_wct - 4;
 895
 896         for (i=0; i<num_reqs; i++) {
 897                 struct cli_smb_state *state;
 898                 state = tevent_req_data(reqs[i], struct cli_smb_state);
 899                 wct_ofs += iov_len(state->iov+1, state->iov_count-1);
 900                 wct_ofs = (wct_ofs + 3) & ~3;
 901         }
 902         return wct_ofs;
 903 }
 904
 905 NTSTATUS cli_smb_chain_send(struct tevent_req **reqs, int num_reqs)
 906 {
 907         struct cli_smb_state *first_state = tevent_req_data(
 908                 reqs[0], struct cli_smb_state);
 909         struct cli_smb_state *last_state = tevent_req_data(
 910                 reqs[num_reqs-1], struct cli_smb_state);
 911         struct cli_smb_state *state;
 912         size_t wct_offset;
 913         size_t chain_padding = 0;
 914         int i, iovlen;
 915         struct iovec *iov = NULL;
 916         struct iovec *this_iov;
 917         NTSTATUS status;
 918
 919         iovlen = 0;
 920         for (i=0; i<num_reqs; i++) {
 921                 state = tevent_req_data(reqs[i], struct cli_smb_state);
 922                 iovlen += state->iov_count;
 923         }
 924
 925         iov = talloc_array(last_state, struct iovec, iovlen);
 926         if (iov == NULL) {
 927                 return NT_STATUS_NO_MEMORY;
 928         }
 929
 930         first_state->chained_requests = (struct tevent_req **)talloc_memdup(
 931                 last_state, reqs, sizeof(*reqs) * num_reqs);
 932         if (first_state->chained_requests == NULL) {
 933                 TALLOC_FREE(iov);
 934                 return NT_STATUS_NO_MEMORY;
 935         }
 936
 937         wct_offset = smb_wct - 4;
 938         this_iov = iov;
 939
 940         for (i=0; i<num_reqs; i++) {
 941                 size_t next_padding = 0;
 942                 uint16_t *vwv;
 943
 944                 state = tevent_req_data(reqs[i], struct cli_smb_state);
 945
 946                 if (i < num_reqs-1) {
 947                         if (!is_andx_req(CVAL(state->header, smb_com))
 948                             || CVAL(state->header, smb_wct) < 2) {
 949                                 TALLOC_FREE(iov);
 950                                 TALLOC_FREE(first_state->chained_requests);
 951                                 return NT_STATUS_INVALID_PARAMETER;
 952                         }
 953                 }
 954
 955                 wct_offset += iov_len(state->iov+1, state->iov_count-1) + 1;
 956                 if ((wct_offset % 4) != 0) {
 957                         next_padding = 4 - (wct_offset % 4);
 958                 }
 959                 wct_offset += next_padding;
 960                 vwv = state->vwv;
 961
 962                 if (i < num_reqs-1) {
 963                         struct cli_smb_state *next_state = tevent_req_data(
 964                                 reqs[i+1], struct cli_smb_state);
 965                         SCVAL(vwv+0, 0, CVAL(next_state->header, smb_com));
 966                         SCVAL(vwv+0, 1, 0);
 967                         SSVAL(vwv+1, 0, wct_offset);
 968                 } else if (is_andx_req(CVAL(state->header, smb_com))) {
 969                         /* properly end the chain */
 970                         SCVAL(vwv+0, 0, 0xff);
 971                         SCVAL(vwv+0, 1, 0xff);
 972                         SSVAL(vwv+1, 0, 0);
 973                 }
 974
 975                 if (i == 0) {
 976                         this_iov[0] = state->iov[0];
 977                 } else {
 978                         /*
 979                          * This one is a bit subtle. We have to add
 980                          * chain_padding bytes between the requests, and we
 981                          * have to also include the wct field of the
 982                          * subsequent requests. We use the subsequent header
 983                          * for the padding, it contains the wct field in its
 984                          * last byte.
 985                          */
 986                         this_iov[0].iov_len = chain_padding+1;
 987                         this_iov[0].iov_base = (void *)&state->header[
 988                                 sizeof(state->header) - this_iov[0].iov_len];
 989                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
 990                 }
 991                 memcpy(this_iov+1, state->iov+1,
 992                        sizeof(struct iovec) * (state->iov_count-1));
 993                 this_iov += state->iov_count;
 994                 chain_padding = next_padding;
 995         }
 996
 997         status = cli_smb_req_iov_send(reqs[0], last_state, iov, iovlen);
 998         if (!NT_STATUS_IS_OK(status)) {
 999                 TALLOC_FREE(iov);
1000                 TALLOC_FREE(first_state->chained_requests);
1001                 return status;
1002         }
1003
1004         return NT_STATUS_OK;
1005 }
1006
1007 uint8_t *cli_smb_inbuf(struct tevent_req *req)
1008 {
1009         struct cli_smb_state *state = tevent_req_data(
1010                 req, struct cli_smb_state);
1011         return state->inbuf;
1012 }
1013
1014 bool cli_has_async_calls(struct cli_state *cli)
1015 {
1016         return ((tevent_queue_length(cli->outgoing) != 0)
1017                 || (talloc_array_length(cli->pending) != 0));
1018 }
1019
1020 struct cli_smb_oplock_break_waiter_state {
1021         uint16_t fnum;
1022         uint8_t level;
1023 };
1024
1025 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq);
1026
1027 struct tevent_req *cli_smb_oplock_break_waiter_send(TALLOC_CTX *mem_ctx,
1028                                                     struct event_context *ev,
1029                                                     struct cli_state *cli)
1030 {
1031         struct tevent_req *req, *subreq;
1032         struct cli_smb_oplock_break_waiter_state *state;
1033         struct cli_smb_state *smb_state;
1034
1035         req = tevent_req_create(mem_ctx, &state,
1036                                 struct cli_smb_oplock_break_waiter_state);
1037         if (req == NULL) {
1038                 return NULL;
1039         }
1040
1041         /*
1042          * Create a fake SMB request that we will never send out. This is only
1043          * used to be set into the pending queue with the right mid.
1044          */
1045         subreq = cli_smb_req_create(mem_ctx, ev, cli, 0, 0, 0, NULL, 0, NULL);
1046         if (tevent_req_nomem(subreq, req)) {
1047                 return tevent_req_post(req, ev);
1048         }
1049         smb_state = tevent_req_data(subreq, struct cli_smb_state);
1050         SSVAL(smb_state->header, smb_mid, 0xffff);
1051
1052         if (!cli_smb_req_set_pending(subreq)) {
1053                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1054                 return tevent_req_post(req, ev);
1055         }
1056         tevent_req_set_callback(subreq, cli_smb_oplock_break_waiter_done, req);
1057         return req;
1058 }
1059
1060 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq)
1061 {
1062         struct tevent_req *req = tevent_req_callback_data(
1063                 subreq, struct tevent_req);
1064         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
1065                 req, struct cli_smb_oplock_break_waiter_state);
1066         uint8_t wct;
1067         uint16_t *vwv;
1068         uint32_t num_bytes;
1069         uint8_t *bytes;
1070         uint8_t *inbuf;
1071         NTSTATUS status;
1072
1073         status = cli_smb_recv(subreq, state, &inbuf, 8, &wct, &vwv,
1074                               &num_bytes, &bytes);
1075         TALLOC_FREE(subreq);
1076         if (!NT_STATUS_IS_OK(status)) {
1077                 tevent_req_nterror(req, status);
1078                 return;
1079         }
1080         state->fnum = SVAL(vwv+2, 0);
1081         state->level = CVAL(vwv+3, 1);
1082         tevent_req_done(req);
1083 }
1084
1085 NTSTATUS cli_smb_oplock_break_waiter_recv(struct tevent_req *req,
1086                                           uint16_t *pfnum,
1087                                           uint8_t *plevel)
1088 {
1089         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
1090                 req, struct cli_smb_oplock_break_waiter_state);
1091         NTSTATUS status;
1092
1093         if (tevent_req_is_nterror(req, &status)) {
1094                 return status;
1095         }
1096         *pfnum = state->fnum;
1097         *plevel = state->level;
1098         return NT_STATUS_OK;
1099 }