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->case_sensitive = false;
 199
 200         /* Set the CLI_FORCE_DOSERR environment variable to test
 201            client routines using DOS errors instead of STATUS32
 202            ones.  This intended only as a temporary hack. */
 203         if (getenv("CLI_FORCE_DOSERR")) {
 204                 force_dos_errors = true;
 205         }
 206         if (flags & CLI_FULL_CONNECTION_FORCE_DOS_ERRORS) {
 207                 force_dos_errors = true;
 208         }
 209
 210         if (getenv("CLI_FORCE_ASCII")) {
 211                 force_ascii = true;
 212         }
 213         if (flags & CLI_FULL_CONNECTION_FORCE_ASCII) {
 214                 force_ascii = true;
 215         }
 216
 217         if (flags & CLI_FULL_CONNECTION_DONT_SPNEGO) {
 218                 use_spnego = false;
 219         } else if (flags & CLI_FULL_CONNECTION_USE_KERBEROS) {
 220                 cli->use_kerberos = true;
 221         }
 222         if ((flags & CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS) &&
 223              cli->use_kerberos) {
 224                 cli->fallback_after_kerberos = true;
 225         }
 226
 227         if (flags & CLI_FULL_CONNECTION_USE_CCACHE) {
 228                 cli->use_ccache = true;
 229         }
 230
 231         if (flags & CLI_FULL_CONNECTION_OPLOCKS) {
 232                 cli->use_oplocks = true;
 233         }
 234         if (flags & CLI_FULL_CONNECTION_LEVEL_II_OPLOCKS) {
 235                 use_level_II_oplocks = true;
 236         }
 237
 238         if (signing_state == Undefined) {
 239                 signing_state = lp_client_signing();
 240         }
 241
 242         switch (signing_state) {
 243         case false:
 244                 /* never */
 245                 allow_smb_signing = false;
 246                 desire_smb_signing = false;
 247                 mandatory_signing = false;
 248                 break;
 249         case true:
 250                 /* if the server supports it */
 251                 allow_smb_signing = true;
 252                 desire_smb_signing = true;
 253                 mandatory_signing = false;
 254                 break;
 255         default:
 256         case Undefined:
 257         case Auto:
 258                 /* if the server requires it */
 259                 allow_smb_signing = true;
 260                 desire_smb_signing = false;
 261                 mandatory_signing = false;
 262                 break;
 263         case Required:
 264                 /* always */
 265                 allow_smb_signing = true;
 266                 desire_smb_signing = true;
 267                 mandatory_signing = true;
 268                 break;
 269         }
 270
 271         /* initialise signing */
 272         cli->signing_state = smb_signing_init(cli,
 273                                               allow_smb_signing,
 274                                               desire_smb_signing,
 275                                               mandatory_signing);
 276         if (!cli->signing_state) {
 277                 goto error;
 278         }
 279
 280         cli->conn.smb1.client.capabilities = 0;
 281         cli->conn.smb1.client.capabilities |= CAP_LARGE_FILES;
 282         cli->conn.smb1.client.capabilities |= CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 283         cli->conn.smb1.client.capabilities |= CAP_LOCK_AND_READ | CAP_NT_FIND;
 284         cli->conn.smb1.client.capabilities |= CAP_DFS | CAP_W2K_SMBS;
 285         cli->conn.smb1.client.capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX;
 286         cli->conn.smb1.client.capabilities |= CAP_LWIO;
 287
 288         if (!force_dos_errors) {
 289                 cli->conn.smb1.client.capabilities |= CAP_STATUS32;
 290         }
 291
 292         if (!force_ascii) {
 293                 cli->conn.smb1.client.capabilities |= CAP_UNICODE;
 294         }
 295
 296         if (use_spnego) {
 297                 cli->conn.smb1.client.capabilities |= CAP_EXTENDED_SECURITY;
 298         }
 299
 300         if (use_level_II_oplocks) {
 301                 cli->conn.smb1.client.capabilities |= CAP_LEVEL_II_OPLOCKS;
 302         }
 303
 304         cli->conn.smb1.client.max_xmit = CLI_BUFFER_SIZE;
 305
 306         cli->conn.smb1.capabilities = cli->conn.smb1.client.capabilities;
 307         cli->conn.smb1.max_xmit = 1024;
 308
 309         cli->conn.smb1.mid = 1;
 310
 311         cli->conn.outgoing = tevent_queue_create(cli, "cli_outgoing");
 312         if (cli->conn.outgoing == NULL) {
 313                 goto error;
 314         }
 315         cli->conn.pending = NULL;
 316
 317         cli->conn.remote_name = talloc_strdup(cli, remote_name);
 318         if (cli->conn.remote_name == NULL) {
 319                 goto error;
 320         }
 321
 322         if (remote_realm) {
 323                 cli->conn.remote_realm = talloc_strdup(cli, remote_realm);
 324                 if (cli->conn.remote_realm == NULL) {
 325                         goto error;
 326                 }
 327         }
 328
 329         cli->conn.fd = fd;
 330
 331         ss_length = sizeof(cli->conn.local_ss);
 332         ret = getsockname(fd,
 333                           (struct sockaddr *)(void *)&cli->conn.local_ss,
 334                           &ss_length);
 335         if (ret == -1) {
 336                 goto error;
 337         }
 338         ss_length = sizeof(cli->conn.remote_ss);
 339         ret = getpeername(fd,
 340                           (struct sockaddr *)(void *)&cli->conn.remote_ss,
 341                           &ss_length);
 342         if (ret == -1) {
 343                 goto error;
 344         }
 345
 346         cli->smb1.pid = (uint16_t)sys_getpid();
 347         cli->smb1.vc_num = cli->smb1.pid;
 348         cli->smb1.tid = UINT16_MAX;
 349         cli->smb1.uid = UID_FIELD_INVALID;
 350
 351         cli->initialised = 1;
 352         return cli;
 353
 354         /* Clean up after malloc() error */
 355
 356  error:
 357
 358         TALLOC_FREE(cli);
 359         return NULL;
 360 }
 361
 362 bool cli_state_encryption_on(struct cli_state *cli)
 363 {
 364         return common_encryption_on(cli->trans_enc_state);
 365 }
 366
 367
 368 /****************************************************************************
 369  Close all pipes open on this session.
 370 ****************************************************************************/
 371
 372 void cli_nt_pipes_close(struct cli_state *cli)
 373 {
 374         while (cli->pipe_list != NULL) {
 375                 /*
 376                  * No TALLOC_FREE here!
 377                  */
 378                 talloc_free(cli->pipe_list);
 379         }
 380 }
 381
 382 /****************************************************************************
 383  Shutdown a client structure.
 384 ****************************************************************************/
 385
 386 static void _cli_shutdown(struct cli_state *cli)
 387 {
 388         cli_nt_pipes_close(cli);
 389
 390         /*
 391          * tell our peer to free his resources.  Wihtout this, when an
 392          * application attempts to do a graceful shutdown and calls
 393          * smbc_free_context() to clean up all connections, some connections
 394          * can remain active on the peer end, until some (long) timeout period
 395          * later.  This tree disconnect forces the peer to clean up, since the
 396          * connection will be going away.
 397          */
 398         if (cli_state_has_tcon(cli)) {
 399                 cli_tdis(cli);
 400         }
 401
 402         data_blob_free(&cli->secblob);
 403         data_blob_free(&cli->user_session_key);
 404
 405         cli_state_disconnect(cli);
 406
 407         /*
 408          * Need to free pending first, they remove themselves
 409          */
 410         while (cli->conn.pending) {
 411                 talloc_free(cli->conn.pending[0]);
 412         }
 413         TALLOC_FREE(cli);
 414 }
 415
 416 void cli_shutdown(struct cli_state *cli)
 417 {
 418         struct cli_state *cli_head;
 419         if (cli == NULL) {
 420                 return;
 421         }
 422         DLIST_HEAD(cli, cli_head);
 423         if (cli_head == cli) {
 424                 /*
 425                  * head of a DFS list, shutdown all subsidiary DFS
 426                  * connections.
 427                  */
 428                 struct cli_state *p, *next;
 429
 430                 for (p = cli_head->next; p; p = next) {
 431                         next = p->next;
 432                         DLIST_REMOVE(cli_head, p);
 433                         _cli_shutdown(p);
 434                 }
 435         } else {
 436                 DLIST_REMOVE(cli_head, cli);
 437         }
 438
 439         _cli_shutdown(cli);
 440 }
 441
 442 /****************************************************************************
 443  Set socket options on a open connection.
 444 ****************************************************************************/
 445
 446 void cli_sockopt(struct cli_state *cli, const char *options)
 447 {
 448         set_socket_options(cli->conn.fd, options);
 449 }
 450
 451 const struct sockaddr_storage *cli_state_local_sockaddr(struct cli_state *cli)
 452 {
 453         return &cli->conn.local_ss;
 454 }
 455
 456 const struct sockaddr_storage *cli_state_remote_sockaddr(struct cli_state *cli)
 457 {
 458         return &cli->conn.remote_ss;
 459 }
 460
 461 const char *cli_state_remote_name(struct cli_state *cli)
 462 {
 463         return cli->conn.remote_name;
 464 }
 465
 466 const char *cli_state_remote_realm(struct cli_state *cli)
 467 {
 468         return cli->conn.remote_realm;
 469 }
 470
 471 uint16_t cli_state_get_vc_num(struct cli_state *cli)
 472 {
 473         return cli->smb1.vc_num;
 474 }
 475
 476 uint32_t cli_state_server_session_key(struct cli_state *cli)
 477 {
 478         return cli->sesskey;
 479 }
 480
 481 /****************************************************************************
 482  Set the PID to use for smb messages. Return the old pid.
 483 ****************************************************************************/
 484
 485 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 486 {
 487         uint16_t ret = cli->smb1.pid;
 488         cli->smb1.pid = pid;
 489         return ret;
 490 }
 491
 492 uint16_t cli_getpid(struct cli_state *cli)
 493 {
 494         return cli->smb1.pid;
 495 }
 496
 497 bool cli_state_has_tcon(struct cli_state *cli)
 498 {
 499         if (cli->smb1.tid == UINT16_MAX) {
 500                 return false;
 501         }
 502
 503         return true;
 504 }
 505
 506 uint16_t cli_state_get_tid(struct cli_state *cli)
 507 {
 508         return cli->smb1.tid;
 509 }
 510
 511 uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid)
 512 {
 513         uint16_t ret = cli->smb1.tid;
 514         cli->smb1.tid = tid;
 515         return ret;
 516 }
 517
 518 uint16_t cli_state_get_uid(struct cli_state *cli)
 519 {
 520         return cli->smb1.uid;
 521 }
 522
 523 uint16_t cli_state_set_uid(struct cli_state *cli, uint16_t uid)
 524 {
 525         uint16_t ret = cli->smb1.uid;
 526         cli->smb1.uid = uid;
 527         return ret;
 528 }
 529
 530 /****************************************************************************
 531  Set the case sensitivity flag on the packets. Returns old state.
 532 ****************************************************************************/
 533
 534 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 535 {
 536         bool ret = cli->case_sensitive;
 537         cli->case_sensitive = case_sensitive;
 538         return ret;
 539 }
 540
 541 enum protocol_types cli_state_protocol(struct cli_state *cli)
 542 {
 543         return cli->conn.protocol;
 544 }
 545
 546 uint32_t cli_state_capabilities(struct cli_state *cli)
 547 {
 548         return cli->conn.smb1.capabilities;
 549 }
 550
 551 uint32_t cli_state_available_size(struct cli_state *cli, uint32_t ofs)
 552 {
 553         uint32_t ret = cli->conn.smb1.max_xmit;
 554
 555         if (ofs >= ret) {
 556                 return 0;
 557         }
 558
 559         ret -= ofs;
 560
 561         return ret;
 562 }
 563
 564 uint16_t cli_state_max_requests(struct cli_state *cli)
 565 {
 566         return cli->max_mux;
 567 }
 568
 569 uint16_t cli_state_security_mode(struct cli_state *cli)
 570 {
 571         return cli->sec_mode;
 572 }
 573
 574 int cli_state_server_time_zone(struct cli_state *cli)
 575 {
 576         return cli->serverzone;
 577 }
 578
 579 time_t cli_state_server_time(struct cli_state *cli)
 580 {
 581         return cli->servertime;
 582 }
 583
 584 struct cli_echo_state {
 585         uint16_t vwv[1];
 586         DATA_BLOB data;
 587         int num_echos;
 588 };
 589
 590 static void cli_echo_done(struct tevent_req *subreq);
 591
 592 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 593                                  struct cli_state *cli, uint16_t num_echos,
 594                                  DATA_BLOB data)
 595 {
 596         struct tevent_req *req, *subreq;
 597         struct cli_echo_state *state;
 598
 599         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 600         if (req == NULL) {
 601                 return NULL;
 602         }
 603         SSVAL(state->vwv, 0, num_echos);
 604         state->data = data;
 605         state->num_echos = num_echos;
 606
 607         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 608                               data.length, data.data);
 609         if (subreq == NULL) {
 610                 goto fail;
 611         }
 612         tevent_req_set_callback(subreq, cli_echo_done, req);
 613         return req;
 614  fail:
 615         TALLOC_FREE(req);
 616         return NULL;
 617 }
 618
 619 static void cli_echo_done(struct tevent_req *subreq)
 620 {
 621         struct tevent_req *req = tevent_req_callback_data(
 622                 subreq, struct tevent_req);
 623         struct cli_echo_state *state = tevent_req_data(
 624                 req, struct cli_echo_state);
 625         NTSTATUS status;
 626         uint32_t num_bytes;
 627         uint8_t *bytes;
 628         uint8_t *inbuf;
 629
 630         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 631                               &num_bytes, &bytes);
 632         if (!NT_STATUS_IS_OK(status)) {
 633                 tevent_req_nterror(req, status);
 634                 return;
 635         }
 636         if ((num_bytes != state->data.length)
 637             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 638                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 639                 return;
 640         }
 641
 642         state->num_echos -=1;
 643         if (state->num_echos == 0) {
 644                 tevent_req_done(req);
 645                 return;
 646         }
 647
 648         if (!cli_smb_req_set_pending(subreq)) {
 649                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 650                 return;
 651         }
 652 }
 653
 654 /**
 655  * Get the result out from an echo request
 656  * @param[in] req       The async_req from cli_echo_send
 657  * @retval Did the server reply correctly?
 658  */
 659
 660 NTSTATUS cli_echo_recv(struct tevent_req *req)
 661 {
 662         return tevent_req_simple_recv_ntstatus(req);
 663 }
 664
 665 /**
 666  * @brief Send/Receive SMBEcho requests
 667  * @param[in] mem_ctx   The memory context to put the async_req on
 668  * @param[in] ev        The event context that will call us back
 669  * @param[in] cli       The connection to send the echo to
 670  * @param[in] num_echos How many times do we want to get the reply?
 671  * @param[in] data      The data we want to get back
 672  * @retval Did the server reply correctly?
 673  */
 674
 675 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 676 {
 677         TALLOC_CTX *frame = talloc_stackframe();
 678         struct event_context *ev;
 679         struct tevent_req *req;
 680         NTSTATUS status = NT_STATUS_OK;
 681
 682         if (cli_has_async_calls(cli)) {
 683                 /*
 684                  * Can't use sync call while an async call is in flight
 685                  */
 686                 status = NT_STATUS_INVALID_PARAMETER;
 687                 goto fail;
 688         }
 689
 690         ev = event_context_init(frame);
 691         if (ev == NULL) {
 692                 status = NT_STATUS_NO_MEMORY;
 693                 goto fail;
 694         }
 695
 696         req = cli_echo_send(frame, ev, cli, num_echos, data);
 697         if (req == NULL) {
 698                 status = NT_STATUS_NO_MEMORY;
 699                 goto fail;
 700         }
 701
 702         if (!tevent_req_poll(req, ev)) {
 703                 status = map_nt_error_from_unix(errno);
 704                 goto fail;
 705         }
 706
 707         status = cli_echo_recv(req);
 708  fail:
 709         TALLOC_FREE(frame);
 710         return status;
 711 }
 712
 713 /**
 714  * Is the SMB command able to hold an AND_X successor
 715  * @param[in] cmd       The SMB command in question
 716  * @retval Can we add a chained request after "cmd"?
 717  */
 718 bool is_andx_req(uint8_t cmd)
 719 {
 720         switch (cmd) {
 721         case SMBtconX:
 722         case SMBlockingX:
 723         case SMBopenX:
 724         case SMBreadX:
 725         case SMBwriteX:
 726         case SMBsesssetupX:
 727         case SMBulogoffX:
 728         case SMBntcreateX:
 729                 return true;
 730                 break;
 731         default:
 732                 break;
 733         }
 734
 735         return false;
 736 }
 737
 738 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 739                  uint8_t smb_command, uint8_t additional_flags,
 740                  uint8_t wct, uint16_t *vwv,
 741                  uint32_t num_bytes, const uint8_t *bytes,
 742                  struct tevent_req **result_parent,
 743                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 744                  uint32_t *pnum_bytes, uint8_t **pbytes)
 745 {
 746         struct tevent_context *ev;
 747         struct tevent_req *req = NULL;
 748         NTSTATUS status = NT_STATUS_NO_MEMORY;
 749
 750         if (cli_has_async_calls(cli)) {
 751                 return NT_STATUS_INVALID_PARAMETER;
 752         }
 753         ev = tevent_context_init(mem_ctx);
 754         if (ev == NULL) {
 755                 goto fail;
 756         }
 757         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 758                            wct, vwv, num_bytes, bytes);
 759         if (req == NULL) {
 760                 goto fail;
 761         }
 762         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 763                 goto fail;
 764         }
 765         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 766                               pnum_bytes, pbytes);
 767 fail:
 768         TALLOC_FREE(ev);
 769         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 770                 *result_parent = req;
 771         }
 772         return status;
 773 }