source3/libsmb/clientgen.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client generic functions
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Jeremy Allison 2007.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "libsmb/libsmb.h"
  23 #include "../lib/util/tevent_ntstatus.h"
  24 #include "smb_signing.h"
  25 #include "async_smb.h"
  26
  27 /*******************************************************************
  28  Setup the word count and byte count for a client smb message.
  29 ********************************************************************/
  30
  31 int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
  32 {
  33         if (zero && (num_words || num_bytes)) {
  34                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  35         }
  36         SCVAL(buf,smb_wct,num_words);
  37         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  38         smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
  39         return (smb_size + num_words*2 + num_bytes);
  40 }
  41
  42 /****************************************************************************
  43  Change the timeout (in milliseconds).
  44 ****************************************************************************/
  45
  46 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  47 {
  48         unsigned int old_timeout = cli->timeout;
  49         cli->timeout = timeout;
  50         return old_timeout;
  51 }
  52
  53 /****************************************************************************
  54  convenience routine to find if we negotiated ucs2
  55 ****************************************************************************/
  56
  57 bool cli_ucs2(struct cli_state *cli)
  58 {
  59         return ((cli_state_capabilities(cli) & CAP_UNICODE) != 0);
  60 }
  61
  62 /****************************************************************************
  63  Setup basics in a outgoing packet.
  64 ****************************************************************************/
  65
  66 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
  67 {
  68         uint16 flags2;
  69         cli->rap_error = 0;
  70         SIVAL(buf,smb_rcls,0);
  71         SSVAL(buf,smb_pid,cli->smb1.pid);
  72         memset(buf+smb_pidhigh, 0, 12);
  73         SSVAL(buf,smb_uid, cli_state_get_uid(cli));
  74         SSVAL(buf,smb_mid, 0);
  75
  76         if (cli_state_protocol(cli) <= PROTOCOL_CORE) {
  77                 return;
  78         }
  79
  80         if (cli->case_sensitive) {
  81                 SCVAL(buf,smb_flg,0x0);
  82         } else {
  83                 /* Default setting, case insensitive. */
  84                 SCVAL(buf,smb_flg,0x8);
  85         }
  86         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
  87         if (cli_state_capabilities(cli) & CAP_UNICODE)
  88                 flags2 |= FLAGS2_UNICODE_STRINGS;
  89         if ((cli_state_capabilities(cli) & CAP_DFS) && cli->dfsroot)
  90                 flags2 |= FLAGS2_DFS_PATHNAMES;
  91         if (cli_state_capabilities(cli) & CAP_STATUS32)
  92                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
  93         if (cli_state_capabilities(cli) & CAP_EXTENDED_SECURITY)
  94                 flags2 |= FLAGS2_EXTENDED_SECURITY;
  95         SSVAL(buf,smb_flg2, flags2);
  96 }
  97
  98 /****************************************************************************
  99  Initialize Domain, user or password.
 100 ****************************************************************************/
 101
 102 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
 103 {
 104         TALLOC_FREE(cli->domain);
 105         cli->domain = talloc_strdup(cli, domain ? domain : "");
 106         if (cli->domain == NULL) {
 107                 return NT_STATUS_NO_MEMORY;
 108         }
 109         return NT_STATUS_OK;
 110 }
 111
 112 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
 113 {
 114         TALLOC_FREE(cli->user_name);
 115         cli->user_name = talloc_strdup(cli, username ? username : "");
 116         if (cli->user_name == NULL) {
 117                 return NT_STATUS_NO_MEMORY;
 118         }
 119         return NT_STATUS_OK;
 120 }
 121
 122 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
 123 {
 124         TALLOC_FREE(cli->password);
 125
 126         /* Password can be NULL. */
 127         if (password) {
 128                 cli->password = talloc_strdup(cli, password);
 129                 if (cli->password == NULL) {
 130                         return NT_STATUS_NO_MEMORY;
 131                 }
 132         } else {
 133                 /* Use zero NTLMSSP hashes and session key. */
 134                 cli->password = NULL;
 135         }
 136
 137         return NT_STATUS_OK;
 138 }
 139
 140 /****************************************************************************
 141  Initialise credentials of a client structure.
 142 ****************************************************************************/
 143
 144 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 145 {
 146         NTSTATUS status = cli_set_username(cli, username);
 147         if (!NT_STATUS_IS_OK(status)) {
 148                 return status;
 149         }
 150         status = cli_set_domain(cli, domain);
 151         if (!NT_STATUS_IS_OK(status)) {
 152                 return status;
 153         }
 154         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 155
 156         return cli_set_password(cli, password);
 157 }
 158
 159 /****************************************************************************
 160  Initialise a client structure. Always returns a talloc'ed struct.
 161  Set the signing state (used from the command line).
 162 ****************************************************************************/
 163
 164 struct cli_state *cli_state_create(TALLOC_CTX *mem_ctx,
 165                                    int fd,
 166                                    const char *remote_name,
 167                                    const char *remote_realm,
 168                                    int signing_state, int flags)
 169 {
 170         struct cli_state *cli = NULL;
 171         bool allow_smb_signing;
 172         bool desire_smb_signing;
 173         bool mandatory_signing;
 174         socklen_t ss_length;
 175         int ret;
 176         bool use_spnego = lp_client_use_spnego();
 177         bool force_dos_errors = false;
 178         bool force_ascii = false;
 179         bool use_level_II_oplocks = false;
 180
 181         /* Check the effective uid - make sure we are not setuid */
 182         if (is_setuid_root()) {
 183                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 184                 return NULL;
 185         }
 186
 187         cli = talloc_zero(mem_ctx, struct cli_state);
 188         if (!cli) {
 189                 return NULL;
 190         }
 191
 192         cli->dfs_mountpoint = talloc_strdup(cli, "");
 193         if (!cli->dfs_mountpoint) {
 194                 goto error;
 195         }
 196         cli->raw_status = NT_STATUS_INTERNAL_ERROR;
 197         cli->timeout = 20000; /* Timeout is in milliseconds. */
 198         cli->max_xmit = CLI_BUFFER_SIZE+4;
 199         cli->case_sensitive = false;
 200
 201         /* Set the CLI_FORCE_DOSERR environment variable to test
 202            client routines using DOS errors instead of STATUS32
 203            ones.  This intended only as a temporary hack. */
 204         if (getenv("CLI_FORCE_DOSERR")) {
 205                 force_dos_errors = true;
 206         }
 207         if (flags & CLI_FULL_CONNECTION_FORCE_DOS_ERRORS) {
 208                 force_dos_errors = true;
 209         }
 210
 211         if (getenv("CLI_FORCE_ASCII")) {
 212                 force_ascii = true;
 213         }
 214         if (flags & CLI_FULL_CONNECTION_FORCE_ASCII) {
 215                 force_ascii = true;
 216         }
 217
 218         if (flags & CLI_FULL_CONNECTION_DONT_SPNEGO) {
 219                 use_spnego = false;
 220         } else if (flags & CLI_FULL_CONNECTION_USE_KERBEROS) {
 221                 cli->use_kerberos = true;
 222         }
 223         if ((flags & CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS) &&
 224              cli->use_kerberos) {
 225                 cli->fallback_after_kerberos = true;
 226         }
 227
 228         if (flags & CLI_FULL_CONNECTION_USE_CCACHE) {
 229                 cli->use_ccache = true;
 230         }
 231
 232         if (flags & CLI_FULL_CONNECTION_OPLOCKS) {
 233                 cli->use_oplocks = true;
 234         }
 235         if (flags & CLI_FULL_CONNECTION_LEVEL_II_OPLOCKS) {
 236                 use_level_II_oplocks = true;
 237         }
 238
 239         if (signing_state == Undefined) {
 240                 signing_state = lp_client_signing();
 241         }
 242
 243         switch (signing_state) {
 244         case false:
 245                 /* never */
 246                 allow_smb_signing = false;
 247                 desire_smb_signing = false;
 248                 mandatory_signing = false;
 249                 break;
 250         case true:
 251                 /* if the server supports it */
 252                 allow_smb_signing = true;
 253                 desire_smb_signing = true;
 254                 mandatory_signing = false;
 255                 break;
 256         default:
 257         case Undefined:
 258         case Auto:
 259                 /* if the server requires it */
 260                 allow_smb_signing = true;
 261                 desire_smb_signing = false;
 262                 mandatory_signing = false;
 263                 break;
 264         case Required:
 265                 /* always */
 266                 allow_smb_signing = true;
 267                 desire_smb_signing = true;
 268                 mandatory_signing = true;
 269                 break;
 270         }
 271
 272         /* initialise signing */
 273         cli->signing_state = smb_signing_init(cli,
 274                                               allow_smb_signing,
 275                                               desire_smb_signing,
 276                                               mandatory_signing);
 277         if (!cli->signing_state) {
 278                 goto error;
 279         }
 280
 281         cli->conn.smb1.client.capabilities = 0;
 282         cli->conn.smb1.client.capabilities |= CAP_LARGE_FILES;
 283         cli->conn.smb1.client.capabilities |= CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 284         cli->conn.smb1.client.capabilities |= CAP_LOCK_AND_READ | CAP_NT_FIND;
 285         cli->conn.smb1.client.capabilities |= CAP_DFS | CAP_W2K_SMBS;
 286         cli->conn.smb1.client.capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX;
 287         cli->conn.smb1.client.capabilities |= CAP_LWIO;
 288
 289         if (!force_dos_errors) {
 290                 cli->conn.smb1.client.capabilities |= CAP_STATUS32;
 291         }
 292
 293         if (!force_ascii) {
 294                 cli->conn.smb1.client.capabilities |= CAP_UNICODE;
 295         }
 296
 297         if (use_spnego) {
 298                 cli->conn.smb1.client.capabilities |= CAP_EXTENDED_SECURITY;
 299         }
 300
 301         if (use_level_II_oplocks) {
 302                 cli->conn.smb1.client.capabilities |= CAP_LEVEL_II_OPLOCKS;
 303         }
 304
 305         cli->conn.smb1.capabilities = cli->conn.smb1.client.capabilities;
 306
 307         cli->conn.smb1.mid = 1;
 308
 309         cli->conn.outgoing = tevent_queue_create(cli, "cli_outgoing");
 310         if (cli->conn.outgoing == NULL) {
 311                 goto error;
 312         }
 313         cli->conn.pending = NULL;
 314
 315         cli->conn.remote_name = talloc_strdup(cli, remote_name);
 316         if (cli->conn.remote_name == NULL) {
 317                 goto error;
 318         }
 319
 320         if (remote_realm) {
 321                 cli->conn.remote_realm = talloc_strdup(cli, remote_realm);
 322                 if (cli->conn.remote_realm == NULL) {
 323                         goto error;
 324                 }
 325         }
 326
 327         cli->conn.fd = fd;
 328
 329         ss_length = sizeof(cli->conn.local_ss);
 330         ret = getsockname(fd,
 331                           (struct sockaddr *)(void *)&cli->conn.local_ss,
 332                           &ss_length);
 333         if (ret == -1) {
 334                 goto error;
 335         }
 336         ss_length = sizeof(cli->conn.remote_ss);
 337         ret = getpeername(fd,
 338                           (struct sockaddr *)(void *)&cli->conn.remote_ss,
 339                           &ss_length);
 340         if (ret == -1) {
 341                 goto error;
 342         }
 343
 344         cli->smb1.pid = (uint16_t)sys_getpid();
 345         cli->smb1.vc_num = cli->smb1.pid;
 346         cli->smb1.tid = UINT16_MAX;
 347         cli->smb1.uid = UID_FIELD_INVALID;
 348
 349         cli->initialised = 1;
 350         return cli;
 351
 352         /* Clean up after malloc() error */
 353
 354  error:
 355
 356         TALLOC_FREE(cli);
 357         return NULL;
 358 }
 359
 360 bool cli_state_encryption_on(struct cli_state *cli)
 361 {
 362         return common_encryption_on(cli->trans_enc_state);
 363 }
 364
 365
 366 /****************************************************************************
 367  Close all pipes open on this session.
 368 ****************************************************************************/
 369
 370 void cli_nt_pipes_close(struct cli_state *cli)
 371 {
 372         while (cli->pipe_list != NULL) {
 373                 /*
 374                  * No TALLOC_FREE here!
 375                  */
 376                 talloc_free(cli->pipe_list);
 377         }
 378 }
 379
 380 /****************************************************************************
 381  Shutdown a client structure.
 382 ****************************************************************************/
 383
 384 static void _cli_shutdown(struct cli_state *cli)
 385 {
 386         cli_nt_pipes_close(cli);
 387
 388         /*
 389          * tell our peer to free his resources.  Wihtout this, when an
 390          * application attempts to do a graceful shutdown and calls
 391          * smbc_free_context() to clean up all connections, some connections
 392          * can remain active on the peer end, until some (long) timeout period
 393          * later.  This tree disconnect forces the peer to clean up, since the
 394          * connection will be going away.
 395          */
 396         if (cli_state_has_tcon(cli)) {
 397                 cli_tdis(cli);
 398         }
 399
 400         data_blob_free(&cli->secblob);
 401         data_blob_free(&cli->user_session_key);
 402
 403         cli_state_disconnect(cli);
 404
 405         /*
 406          * Need to free pending first, they remove themselves
 407          */
 408         while (cli->conn.pending) {
 409                 talloc_free(cli->conn.pending[0]);
 410         }
 411         TALLOC_FREE(cli);
 412 }
 413
 414 void cli_shutdown(struct cli_state *cli)
 415 {
 416         struct cli_state *cli_head;
 417         if (cli == NULL) {
 418                 return;
 419         }
 420         DLIST_HEAD(cli, cli_head);
 421         if (cli_head == cli) {
 422                 /*
 423                  * head of a DFS list, shutdown all subsidiary DFS
 424                  * connections.
 425                  */
 426                 struct cli_state *p, *next;
 427
 428                 for (p = cli_head->next; p; p = next) {
 429                         next = p->next;
 430                         DLIST_REMOVE(cli_head, p);
 431                         _cli_shutdown(p);
 432                 }
 433         } else {
 434                 DLIST_REMOVE(cli_head, cli);
 435         }
 436
 437         _cli_shutdown(cli);
 438 }
 439
 440 /****************************************************************************
 441  Set socket options on a open connection.
 442 ****************************************************************************/
 443
 444 void cli_sockopt(struct cli_state *cli, const char *options)
 445 {
 446         set_socket_options(cli->conn.fd, options);
 447 }
 448
 449 const struct sockaddr_storage *cli_state_local_sockaddr(struct cli_state *cli)
 450 {
 451         return &cli->conn.local_ss;
 452 }
 453
 454 const struct sockaddr_storage *cli_state_remote_sockaddr(struct cli_state *cli)
 455 {
 456         return &cli->conn.remote_ss;
 457 }
 458
 459 const char *cli_state_remote_name(struct cli_state *cli)
 460 {
 461         return cli->conn.remote_name;
 462 }
 463
 464 const char *cli_state_remote_realm(struct cli_state *cli)
 465 {
 466         return cli->conn.remote_realm;
 467 }
 468
 469 uint16_t cli_state_get_vc_num(struct cli_state *cli)
 470 {
 471         return cli->smb1.vc_num;
 472 }
 473
 474 uint32_t cli_state_server_session_key(struct cli_state *cli)
 475 {
 476         return cli->sesskey;
 477 }
 478
 479 /****************************************************************************
 480  Set the PID to use for smb messages. Return the old pid.
 481 ****************************************************************************/
 482
 483 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 484 {
 485         uint16_t ret = cli->smb1.pid;
 486         cli->smb1.pid = pid;
 487         return ret;
 488 }
 489
 490 uint16_t cli_getpid(struct cli_state *cli)
 491 {
 492         return cli->smb1.pid;
 493 }
 494
 495 bool cli_state_has_tcon(struct cli_state *cli)
 496 {
 497         if (cli->smb1.tid == UINT16_MAX) {
 498                 return false;
 499         }
 500
 501         return true;
 502 }
 503
 504 uint16_t cli_state_get_tid(struct cli_state *cli)
 505 {
 506         return cli->smb1.tid;
 507 }
 508
 509 uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid)
 510 {
 511         uint16_t ret = cli->smb1.tid;
 512         cli->smb1.tid = tid;
 513         return ret;
 514 }
 515
 516 uint16_t cli_state_get_uid(struct cli_state *cli)
 517 {
 518         return cli->smb1.uid;
 519 }
 520
 521 uint16_t cli_state_set_uid(struct cli_state *cli, uint16_t uid)
 522 {
 523         uint16_t ret = cli->smb1.uid;
 524         cli->smb1.uid = uid;
 525         return ret;
 526 }
 527
 528 /****************************************************************************
 529  Set the case sensitivity flag on the packets. Returns old state.
 530 ****************************************************************************/
 531
 532 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 533 {
 534         bool ret = cli->case_sensitive;
 535         cli->case_sensitive = case_sensitive;
 536         return ret;
 537 }
 538
 539 enum protocol_types cli_state_protocol(struct cli_state *cli)
 540 {
 541         return cli->conn.protocol;
 542 }
 543
 544 uint32_t cli_state_capabilities(struct cli_state *cli)
 545 {
 546         return cli->conn.smb1.capabilities;
 547 }
 548
 549 uint32_t cli_state_available_size(struct cli_state *cli, uint32_t ofs)
 550 {
 551         uint32_t ret = cli->max_xmit;
 552
 553         if (ofs >= ret) {
 554                 return 0;
 555         }
 556
 557         ret -= ofs;
 558
 559         return ret;
 560 }
 561
 562 uint16_t cli_state_max_requests(struct cli_state *cli)
 563 {
 564         return cli->max_mux;
 565 }
 566
 567 uint16_t cli_state_security_mode(struct cli_state *cli)
 568 {
 569         return cli->sec_mode;
 570 }
 571
 572 int cli_state_server_time_zone(struct cli_state *cli)
 573 {
 574         return cli->serverzone;
 575 }
 576
 577 time_t cli_state_server_time(struct cli_state *cli)
 578 {
 579         return cli->servertime;
 580 }
 581
 582 struct cli_echo_state {
 583         uint16_t vwv[1];
 584         DATA_BLOB data;
 585         int num_echos;
 586 };
 587
 588 static void cli_echo_done(struct tevent_req *subreq);
 589
 590 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 591                                  struct cli_state *cli, uint16_t num_echos,
 592                                  DATA_BLOB data)
 593 {
 594         struct tevent_req *req, *subreq;
 595         struct cli_echo_state *state;
 596
 597         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 598         if (req == NULL) {
 599                 return NULL;
 600         }
 601         SSVAL(state->vwv, 0, num_echos);
 602         state->data = data;
 603         state->num_echos = num_echos;
 604
 605         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 606                               data.length, data.data);
 607         if (subreq == NULL) {
 608                 goto fail;
 609         }
 610         tevent_req_set_callback(subreq, cli_echo_done, req);
 611         return req;
 612  fail:
 613         TALLOC_FREE(req);
 614         return NULL;
 615 }
 616
 617 static void cli_echo_done(struct tevent_req *subreq)
 618 {
 619         struct tevent_req *req = tevent_req_callback_data(
 620                 subreq, struct tevent_req);
 621         struct cli_echo_state *state = tevent_req_data(
 622                 req, struct cli_echo_state);
 623         NTSTATUS status;
 624         uint32_t num_bytes;
 625         uint8_t *bytes;
 626         uint8_t *inbuf;
 627
 628         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 629                               &num_bytes, &bytes);
 630         if (!NT_STATUS_IS_OK(status)) {
 631                 tevent_req_nterror(req, status);
 632                 return;
 633         }
 634         if ((num_bytes != state->data.length)
 635             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 636                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 637                 return;
 638         }
 639
 640         state->num_echos -=1;
 641         if (state->num_echos == 0) {
 642                 tevent_req_done(req);
 643                 return;
 644         }
 645
 646         if (!cli_smb_req_set_pending(subreq)) {
 647                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 648                 return;
 649         }
 650 }
 651
 652 /**
 653  * Get the result out from an echo request
 654  * @param[in] req       The async_req from cli_echo_send
 655  * @retval Did the server reply correctly?
 656  */
 657
 658 NTSTATUS cli_echo_recv(struct tevent_req *req)
 659 {
 660         return tevent_req_simple_recv_ntstatus(req);
 661 }
 662
 663 /**
 664  * @brief Send/Receive SMBEcho requests
 665  * @param[in] mem_ctx   The memory context to put the async_req on
 666  * @param[in] ev        The event context that will call us back
 667  * @param[in] cli       The connection to send the echo to
 668  * @param[in] num_echos How many times do we want to get the reply?
 669  * @param[in] data      The data we want to get back
 670  * @retval Did the server reply correctly?
 671  */
 672
 673 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 674 {
 675         TALLOC_CTX *frame = talloc_stackframe();
 676         struct event_context *ev;
 677         struct tevent_req *req;
 678         NTSTATUS status = NT_STATUS_OK;
 679
 680         if (cli_has_async_calls(cli)) {
 681                 /*
 682                  * Can't use sync call while an async call is in flight
 683                  */
 684                 status = NT_STATUS_INVALID_PARAMETER;
 685                 goto fail;
 686         }
 687
 688         ev = event_context_init(frame);
 689         if (ev == NULL) {
 690                 status = NT_STATUS_NO_MEMORY;
 691                 goto fail;
 692         }
 693
 694         req = cli_echo_send(frame, ev, cli, num_echos, data);
 695         if (req == NULL) {
 696                 status = NT_STATUS_NO_MEMORY;
 697                 goto fail;
 698         }
 699
 700         if (!tevent_req_poll(req, ev)) {
 701                 status = map_nt_error_from_unix(errno);
 702                 goto fail;
 703         }
 704
 705         status = cli_echo_recv(req);
 706  fail:
 707         TALLOC_FREE(frame);
 708         return status;
 709 }
 710
 711 /**
 712  * Is the SMB command able to hold an AND_X successor
 713  * @param[in] cmd       The SMB command in question
 714  * @retval Can we add a chained request after "cmd"?
 715  */
 716 bool is_andx_req(uint8_t cmd)
 717 {
 718         switch (cmd) {
 719         case SMBtconX:
 720         case SMBlockingX:
 721         case SMBopenX:
 722         case SMBreadX:
 723         case SMBwriteX:
 724         case SMBsesssetupX:
 725         case SMBulogoffX:
 726         case SMBntcreateX:
 727                 return true;
 728                 break;
 729         default:
 730                 break;
 731         }
 732
 733         return false;
 734 }
 735
 736 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 737                  uint8_t smb_command, uint8_t additional_flags,
 738                  uint8_t wct, uint16_t *vwv,
 739                  uint32_t num_bytes, const uint8_t *bytes,
 740                  struct tevent_req **result_parent,
 741                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 742                  uint32_t *pnum_bytes, uint8_t **pbytes)
 743 {
 744         struct tevent_context *ev;
 745         struct tevent_req *req = NULL;
 746         NTSTATUS status = NT_STATUS_NO_MEMORY;
 747
 748         if (cli_has_async_calls(cli)) {
 749                 return NT_STATUS_INVALID_PARAMETER;
 750         }
 751         ev = tevent_context_init(mem_ctx);
 752         if (ev == NULL) {
 753                 goto fail;
 754         }
 755         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 756                            wct, vwv, num_bytes, bytes);
 757         if (req == NULL) {
 758                 goto fail;
 759         }
 760         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 761                 goto fail;
 762         }
 763         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 764                               pnum_bytes, pbytes);
 765 fail:
 766         TALLOC_FREE(ev);
 767         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 768                 *result_parent = req;
 769         }
 770         return status;
 771 }