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 "../libcli/smb/smb_signing.h"
  25 #include "../libcli/smb/smb_seal.h"
  26 #include "async_smb.h"
  27
  28 /*******************************************************************
  29  Setup the word count and byte count for a client smb message.
  30 ********************************************************************/
  31
  32 int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
  33 {
  34         if (zero && (num_words || num_bytes)) {
  35                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  36         }
  37         SCVAL(buf,smb_wct,num_words);
  38         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  39         smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
  40         return (smb_size + num_words*2 + num_bytes);
  41 }
  42
  43 /****************************************************************************
  44  Change the timeout (in milliseconds).
  45 ****************************************************************************/
  46
  47 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  48 {
  49         unsigned int old_timeout = cli->timeout;
  50         cli->timeout = timeout;
  51         return old_timeout;
  52 }
  53
  54 /****************************************************************************
  55  convenience routine to find if we negotiated ucs2
  56 ****************************************************************************/
  57
  58 bool cli_ucs2(struct cli_state *cli)
  59 {
  60         return ((cli_state_capabilities(cli) & CAP_UNICODE) != 0);
  61 }
  62
  63 /****************************************************************************
  64  Setup basics in a outgoing packet.
  65 ****************************************************************************/
  66
  67 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
  68 {
  69         uint16 flags2;
  70         cli->rap_error = 0;
  71         SIVAL(buf,smb_rcls,0);
  72         SSVAL(buf,smb_pid,cli->smb1.pid);
  73         memset(buf+smb_pidhigh, 0, 12);
  74         SSVAL(buf,smb_uid, cli_state_get_uid(cli));
  75         SSVAL(buf,smb_mid, 0);
  76
  77         if (cli_state_protocol(cli) <= PROTOCOL_CORE) {
  78                 return;
  79         }
  80
  81         if (cli->case_sensitive) {
  82                 SCVAL(buf,smb_flg,0x0);
  83         } else {
  84                 /* Default setting, case insensitive. */
  85                 SCVAL(buf,smb_flg,0x8);
  86         }
  87         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
  88         if (cli_state_capabilities(cli) & CAP_UNICODE)
  89                 flags2 |= FLAGS2_UNICODE_STRINGS;
  90         if ((cli_state_capabilities(cli) & CAP_DFS) && cli->dfsroot)
  91                 flags2 |= FLAGS2_DFS_PATHNAMES;
  92         if (cli_state_capabilities(cli) & CAP_STATUS32)
  93                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
  94         if (cli_state_capabilities(cli) & CAP_EXTENDED_SECURITY)
  95                 flags2 |= FLAGS2_EXTENDED_SECURITY;
  96         SSVAL(buf,smb_flg2, flags2);
  97 }
  98
  99 /****************************************************************************
 100  Initialize Domain, user or password.
 101 ****************************************************************************/
 102
 103 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
 104 {
 105         TALLOC_FREE(cli->domain);
 106         cli->domain = talloc_strdup(cli, domain ? domain : "");
 107         if (cli->domain == NULL) {
 108                 return NT_STATUS_NO_MEMORY;
 109         }
 110         return NT_STATUS_OK;
 111 }
 112
 113 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
 114 {
 115         TALLOC_FREE(cli->user_name);
 116         cli->user_name = talloc_strdup(cli, username ? username : "");
 117         if (cli->user_name == NULL) {
 118                 return NT_STATUS_NO_MEMORY;
 119         }
 120         return NT_STATUS_OK;
 121 }
 122
 123 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
 124 {
 125         TALLOC_FREE(cli->password);
 126
 127         /* Password can be NULL. */
 128         if (password) {
 129                 cli->password = talloc_strdup(cli, password);
 130                 if (cli->password == NULL) {
 131                         return NT_STATUS_NO_MEMORY;
 132                 }
 133         } else {
 134                 /* Use zero NTLMSSP hashes and session key. */
 135                 cli->password = NULL;
 136         }
 137
 138         return NT_STATUS_OK;
 139 }
 140
 141 /****************************************************************************
 142  Initialise credentials of a client structure.
 143 ****************************************************************************/
 144
 145 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 146 {
 147         NTSTATUS status = cli_set_username(cli, username);
 148         if (!NT_STATUS_IS_OK(status)) {
 149                 return status;
 150         }
 151         status = cli_set_domain(cli, domain);
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 return status;
 154         }
 155         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 156
 157         return cli_set_password(cli, password);
 158 }
 159
 160 /****************************************************************************
 161  Initialise a client structure. Always returns a talloc'ed struct.
 162  Set the signing state (used from the command line).
 163 ****************************************************************************/
 164
 165 struct cli_state *cli_state_create(TALLOC_CTX *mem_ctx,
 166                                    int fd,
 167                                    const char *remote_name,
 168                                    const char *remote_realm,
 169                                    int signing_state, int flags)
 170 {
 171         struct cli_state *cli = NULL;
 172         bool allow_smb_signing;
 173         bool desire_smb_signing;
 174         bool mandatory_signing;
 175         socklen_t ss_length;
 176         int ret;
 177         bool use_spnego = lp_client_use_spnego();
 178         bool force_dos_errors = false;
 179         bool force_ascii = false;
 180         bool use_level_II_oplocks = false;
 181
 182         /* Check the effective uid - make sure we are not setuid */
 183         if (is_setuid_root()) {
 184                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 185                 return NULL;
 186         }
 187
 188         cli = talloc_zero(mem_ctx, struct cli_state);
 189         if (!cli) {
 190                 return NULL;
 191         }
 192
 193         cli->dfs_mountpoint = talloc_strdup(cli, "");
 194         if (!cli->dfs_mountpoint) {
 195                 goto error;
 196         }
 197         cli->raw_status = NT_STATUS_INTERNAL_ERROR;
 198         cli->timeout = 20000; /* Timeout is in milliseconds. */
 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         default:
 251         case true:
 252         case Undefined:
 253         case Auto:
 254                 allow_smb_signing = true;
 255                 desire_smb_signing = false;
 256                 mandatory_signing = false;
 257                 break;
 258         case Required:
 259                 /* always */
 260                 allow_smb_signing = true;
 261                 desire_smb_signing = true;
 262                 mandatory_signing = true;
 263                 break;
 264         }
 265
 266         /* initialise signing */
 267         cli->signing_state = smb_signing_init(cli,
 268                                               allow_smb_signing,
 269                                               desire_smb_signing,
 270                                               mandatory_signing);
 271         if (!cli->signing_state) {
 272                 goto error;
 273         }
 274
 275         cli->conn.smb1.client.capabilities = 0;
 276         cli->conn.smb1.client.capabilities |= CAP_LARGE_FILES;
 277         cli->conn.smb1.client.capabilities |= CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 278         cli->conn.smb1.client.capabilities |= CAP_LOCK_AND_READ | CAP_NT_FIND;
 279         cli->conn.smb1.client.capabilities |= CAP_DFS | CAP_W2K_SMBS;
 280         cli->conn.smb1.client.capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX;
 281         cli->conn.smb1.client.capabilities |= CAP_LWIO;
 282
 283         if (!force_dos_errors) {
 284                 cli->conn.smb1.client.capabilities |= CAP_STATUS32;
 285         }
 286
 287         if (!force_ascii) {
 288                 cli->conn.smb1.client.capabilities |= CAP_UNICODE;
 289         }
 290
 291         if (use_spnego) {
 292                 cli->conn.smb1.client.capabilities |= CAP_EXTENDED_SECURITY;
 293         }
 294
 295         if (use_level_II_oplocks) {
 296                 cli->conn.smb1.client.capabilities |= CAP_LEVEL_II_OPLOCKS;
 297         }
 298
 299         cli->conn.smb1.client.max_xmit = CLI_BUFFER_SIZE;
 300
 301         cli->conn.smb1.capabilities = cli->conn.smb1.client.capabilities;
 302         cli->conn.smb1.max_xmit = 1024;
 303
 304         cli->conn.smb1.mid = 1;
 305
 306         cli->conn.outgoing = tevent_queue_create(cli, "cli_outgoing");
 307         if (cli->conn.outgoing == NULL) {
 308                 goto error;
 309         }
 310         cli->conn.pending = NULL;
 311
 312         cli->conn.remote_name = talloc_strdup(cli, remote_name);
 313         if (cli->conn.remote_name == NULL) {
 314                 goto error;
 315         }
 316
 317         if (remote_realm) {
 318                 cli->conn.remote_realm = talloc_strdup(cli, remote_realm);
 319                 if (cli->conn.remote_realm == NULL) {
 320                         goto error;
 321                 }
 322         }
 323
 324         cli->conn.fd = fd;
 325
 326         ss_length = sizeof(cli->conn.local_ss);
 327         ret = getsockname(fd,
 328                           (struct sockaddr *)(void *)&cli->conn.local_ss,
 329                           &ss_length);
 330         if (ret == -1) {
 331                 goto error;
 332         }
 333         ss_length = sizeof(cli->conn.remote_ss);
 334         ret = getpeername(fd,
 335                           (struct sockaddr *)(void *)&cli->conn.remote_ss,
 336                           &ss_length);
 337         if (ret == -1) {
 338                 goto error;
 339         }
 340
 341         cli->smb1.pid = (uint16_t)sys_getpid();
 342         cli->smb1.vc_num = cli->smb1.pid;
 343         cli->smb1.tid = UINT16_MAX;
 344         cli->smb1.uid = UID_FIELD_INVALID;
 345
 346         cli->initialised = 1;
 347         return cli;
 348
 349         /* Clean up after malloc() error */
 350
 351  error:
 352
 353         TALLOC_FREE(cli);
 354         return NULL;
 355 }
 356
 357 bool cli_state_encryption_on(struct cli_state *cli)
 358 {
 359         return common_encryption_on(cli->trans_enc_state);
 360 }
 361
 362
 363 /****************************************************************************
 364  Close all pipes open on this session.
 365 ****************************************************************************/
 366
 367 void cli_nt_pipes_close(struct cli_state *cli)
 368 {
 369         while (cli->pipe_list != NULL) {
 370                 /*
 371                  * No TALLOC_FREE here!
 372                  */
 373                 talloc_free(cli->pipe_list);
 374         }
 375 }
 376
 377 /****************************************************************************
 378  Shutdown a client structure.
 379 ****************************************************************************/
 380
 381 static void _cli_shutdown(struct cli_state *cli)
 382 {
 383         cli_nt_pipes_close(cli);
 384
 385         /*
 386          * tell our peer to free his resources.  Wihtout this, when an
 387          * application attempts to do a graceful shutdown and calls
 388          * smbc_free_context() to clean up all connections, some connections
 389          * can remain active on the peer end, until some (long) timeout period
 390          * later.  This tree disconnect forces the peer to clean up, since the
 391          * connection will be going away.
 392          */
 393         if (cli_state_has_tcon(cli)) {
 394                 cli_tdis(cli);
 395         }
 396
 397         data_blob_free(&cli->user_session_key);
 398
 399         cli_state_disconnect(cli);
 400
 401         /*
 402          * Need to free pending first, they remove themselves
 403          */
 404         while (cli->conn.pending) {
 405                 talloc_free(cli->conn.pending[0]);
 406         }
 407         TALLOC_FREE(cli);
 408 }
 409
 410 void cli_shutdown(struct cli_state *cli)
 411 {
 412         struct cli_state *cli_head;
 413         if (cli == NULL) {
 414                 return;
 415         }
 416         DLIST_HEAD(cli, cli_head);
 417         if (cli_head == cli) {
 418                 /*
 419                  * head of a DFS list, shutdown all subsidiary DFS
 420                  * connections.
 421                  */
 422                 struct cli_state *p, *next;
 423
 424                 for (p = cli_head->next; p; p = next) {
 425                         next = p->next;
 426                         DLIST_REMOVE(cli_head, p);
 427                         _cli_shutdown(p);
 428                 }
 429         } else {
 430                 DLIST_REMOVE(cli_head, cli);
 431         }
 432
 433         _cli_shutdown(cli);
 434 }
 435
 436 /****************************************************************************
 437  Set socket options on a open connection.
 438 ****************************************************************************/
 439
 440 void cli_sockopt(struct cli_state *cli, const char *options)
 441 {
 442         set_socket_options(cli->conn.fd, options);
 443 }
 444
 445 const struct sockaddr_storage *cli_state_local_sockaddr(struct cli_state *cli)
 446 {
 447         return &cli->conn.local_ss;
 448 }
 449
 450 const struct sockaddr_storage *cli_state_remote_sockaddr(struct cli_state *cli)
 451 {
 452         return &cli->conn.remote_ss;
 453 }
 454
 455 const char *cli_state_remote_name(struct cli_state *cli)
 456 {
 457         return cli->conn.remote_name;
 458 }
 459
 460 const char *cli_state_remote_realm(struct cli_state *cli)
 461 {
 462         return cli->conn.remote_realm;
 463 }
 464
 465 uint16_t cli_state_get_vc_num(struct cli_state *cli)
 466 {
 467         return cli->smb1.vc_num;
 468 }
 469
 470 uint32_t cli_state_server_session_key(struct cli_state *cli)
 471 {
 472         return cli->conn.smb1.server.session_key;
 473 }
 474
 475 /****************************************************************************
 476  Set the PID to use for smb messages. Return the old pid.
 477 ****************************************************************************/
 478
 479 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 480 {
 481         uint16_t ret = cli->smb1.pid;
 482         cli->smb1.pid = pid;
 483         return ret;
 484 }
 485
 486 uint16_t cli_getpid(struct cli_state *cli)
 487 {
 488         return cli->smb1.pid;
 489 }
 490
 491 bool cli_state_has_tcon(struct cli_state *cli)
 492 {
 493         if (cli->smb1.tid == UINT16_MAX) {
 494                 return false;
 495         }
 496
 497         return true;
 498 }
 499
 500 uint16_t cli_state_get_tid(struct cli_state *cli)
 501 {
 502         return cli->smb1.tid;
 503 }
 504
 505 uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid)
 506 {
 507         uint16_t ret = cli->smb1.tid;
 508         cli->smb1.tid = tid;
 509         return ret;
 510 }
 511
 512 uint16_t cli_state_get_uid(struct cli_state *cli)
 513 {
 514         return cli->smb1.uid;
 515 }
 516
 517 uint16_t cli_state_set_uid(struct cli_state *cli, uint16_t uid)
 518 {
 519         uint16_t ret = cli->smb1.uid;
 520         cli->smb1.uid = uid;
 521         return ret;
 522 }
 523
 524 /****************************************************************************
 525  Set the case sensitivity flag on the packets. Returns old state.
 526 ****************************************************************************/
 527
 528 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 529 {
 530         bool ret = cli->case_sensitive;
 531         cli->case_sensitive = case_sensitive;
 532         return ret;
 533 }
 534
 535 enum protocol_types cli_state_protocol(struct cli_state *cli)
 536 {
 537         return cli->conn.protocol;
 538 }
 539
 540 uint32_t cli_state_capabilities(struct cli_state *cli)
 541 {
 542         return cli->conn.smb1.capabilities;
 543 }
 544
 545 uint32_t cli_state_available_size(struct cli_state *cli, uint32_t ofs)
 546 {
 547         uint32_t ret = cli->conn.smb1.max_xmit;
 548
 549         if (ofs >= ret) {
 550                 return 0;
 551         }
 552
 553         ret -= ofs;
 554
 555         return ret;
 556 }
 557
 558 uint16_t cli_state_max_requests(struct cli_state *cli)
 559 {
 560         return cli->conn.smb1.server.max_mux;
 561 }
 562
 563 const uint8_t *cli_state_server_challenge(struct cli_state *cli)
 564 {
 565         return cli->conn.smb1.server.challenge;
 566 }
 567
 568 const DATA_BLOB *cli_state_server_gss_blob(struct cli_state *cli)
 569 {
 570         return &cli->conn.smb1.server.gss_blob;
 571 }
 572
 573 uint16_t cli_state_security_mode(struct cli_state *cli)
 574 {
 575         return cli->conn.smb1.server.security_mode;
 576 }
 577
 578 int cli_state_server_time_zone(struct cli_state *cli)
 579 {
 580         return cli->conn.smb1.server.time_zone;
 581 }
 582
 583 time_t cli_state_server_time(struct cli_state *cli)
 584 {
 585         return cli->conn.smb1.server.system_time;
 586 }
 587
 588 struct cli_echo_state {
 589         uint16_t vwv[1];
 590         DATA_BLOB data;
 591         int num_echos;
 592 };
 593
 594 static void cli_echo_done(struct tevent_req *subreq);
 595
 596 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 597                                  struct cli_state *cli, uint16_t num_echos,
 598                                  DATA_BLOB data)
 599 {
 600         struct tevent_req *req, *subreq;
 601         struct cli_echo_state *state;
 602
 603         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 604         if (req == NULL) {
 605                 return NULL;
 606         }
 607         SSVAL(state->vwv, 0, num_echos);
 608         state->data = data;
 609         state->num_echos = num_echos;
 610
 611         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 612                               data.length, data.data);
 613         if (subreq == NULL) {
 614                 goto fail;
 615         }
 616         tevent_req_set_callback(subreq, cli_echo_done, req);
 617         return req;
 618  fail:
 619         TALLOC_FREE(req);
 620         return NULL;
 621 }
 622
 623 static void cli_echo_done(struct tevent_req *subreq)
 624 {
 625         struct tevent_req *req = tevent_req_callback_data(
 626                 subreq, struct tevent_req);
 627         struct cli_echo_state *state = tevent_req_data(
 628                 req, struct cli_echo_state);
 629         NTSTATUS status;
 630         uint32_t num_bytes;
 631         uint8_t *bytes;
 632         uint8_t *inbuf;
 633
 634         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 635                               &num_bytes, &bytes);
 636         if (!NT_STATUS_IS_OK(status)) {
 637                 tevent_req_nterror(req, status);
 638                 return;
 639         }
 640         if ((num_bytes != state->data.length)
 641             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 642                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 643                 return;
 644         }
 645
 646         state->num_echos -=1;
 647         if (state->num_echos == 0) {
 648                 tevent_req_done(req);
 649                 return;
 650         }
 651
 652         if (!cli_smb_req_set_pending(subreq)) {
 653                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 654                 return;
 655         }
 656 }
 657
 658 /**
 659  * Get the result out from an echo request
 660  * @param[in] req       The async_req from cli_echo_send
 661  * @retval Did the server reply correctly?
 662  */
 663
 664 NTSTATUS cli_echo_recv(struct tevent_req *req)
 665 {
 666         return tevent_req_simple_recv_ntstatus(req);
 667 }
 668
 669 /**
 670  * @brief Send/Receive SMBEcho requests
 671  * @param[in] mem_ctx   The memory context to put the async_req on
 672  * @param[in] ev        The event context that will call us back
 673  * @param[in] cli       The connection to send the echo to
 674  * @param[in] num_echos How many times do we want to get the reply?
 675  * @param[in] data      The data we want to get back
 676  * @retval Did the server reply correctly?
 677  */
 678
 679 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 680 {
 681         TALLOC_CTX *frame = talloc_stackframe();
 682         struct event_context *ev;
 683         struct tevent_req *req;
 684         NTSTATUS status = NT_STATUS_OK;
 685
 686         if (cli_has_async_calls(cli)) {
 687                 /*
 688                  * Can't use sync call while an async call is in flight
 689                  */
 690                 status = NT_STATUS_INVALID_PARAMETER;
 691                 goto fail;
 692         }
 693
 694         ev = event_context_init(frame);
 695         if (ev == NULL) {
 696                 status = NT_STATUS_NO_MEMORY;
 697                 goto fail;
 698         }
 699
 700         req = cli_echo_send(frame, ev, cli, num_echos, data);
 701         if (req == NULL) {
 702                 status = NT_STATUS_NO_MEMORY;
 703                 goto fail;
 704         }
 705
 706         if (!tevent_req_poll(req, ev)) {
 707                 status = map_nt_error_from_unix(errno);
 708                 goto fail;
 709         }
 710
 711         status = cli_echo_recv(req);
 712  fail:
 713         TALLOC_FREE(frame);
 714         return status;
 715 }
 716
 717 /**
 718  * Is the SMB command able to hold an AND_X successor
 719  * @param[in] cmd       The SMB command in question
 720  * @retval Can we add a chained request after "cmd"?
 721  */
 722 bool is_andx_req(uint8_t cmd)
 723 {
 724         switch (cmd) {
 725         case SMBtconX:
 726         case SMBlockingX:
 727         case SMBopenX:
 728         case SMBreadX:
 729         case SMBwriteX:
 730         case SMBsesssetupX:
 731         case SMBulogoffX:
 732         case SMBntcreateX:
 733                 return true;
 734                 break;
 735         default:
 736                 break;
 737         }
 738
 739         return false;
 740 }
 741
 742 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 743                  uint8_t smb_command, uint8_t additional_flags,
 744                  uint8_t wct, uint16_t *vwv,
 745                  uint32_t num_bytes, const uint8_t *bytes,
 746                  struct tevent_req **result_parent,
 747                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 748                  uint32_t *pnum_bytes, uint8_t **pbytes)
 749 {
 750         struct tevent_context *ev;
 751         struct tevent_req *req = NULL;
 752         NTSTATUS status = NT_STATUS_NO_MEMORY;
 753
 754         if (cli_has_async_calls(cli)) {
 755                 return NT_STATUS_INVALID_PARAMETER;
 756         }
 757         ev = tevent_context_init(mem_ctx);
 758         if (ev == NULL) {
 759                 goto fail;
 760         }
 761         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 762                            wct, vwv, num_bytes, bytes);
 763         if (req == NULL) {
 764                 goto fail;
 765         }
 766         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 767                 goto fail;
 768         }
 769         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 770                               pnum_bytes, pbytes);
 771 fail:
 772         TALLOC_FREE(ev);
 773         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 774                 *result_parent = req;
 775         }
 776         return status;
 777 }