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         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.client.max_xmit = CLI_BUFFER_SIZE;
 306
 307         cli->conn.smb1.capabilities = cli->conn.smb1.client.capabilities;
 308         cli->conn.smb1.max_xmit = 1024;
 309
 310         cli->conn.smb1.mid = 1;
 311
 312         cli->conn.outgoing = tevent_queue_create(cli, "cli_outgoing");
 313         if (cli->conn.outgoing == NULL) {
 314                 goto error;
 315         }
 316         cli->conn.pending = NULL;
 317
 318         cli->conn.remote_name = talloc_strdup(cli, remote_name);
 319         if (cli->conn.remote_name == NULL) {
 320                 goto error;
 321         }
 322
 323         if (remote_realm) {
 324                 cli->conn.remote_realm = talloc_strdup(cli, remote_realm);
 325                 if (cli->conn.remote_realm == NULL) {
 326                         goto error;
 327                 }
 328         }
 329
 330         cli->conn.fd = fd;
 331
 332         ss_length = sizeof(cli->conn.local_ss);
 333         ret = getsockname(fd,
 334                           (struct sockaddr *)(void *)&cli->conn.local_ss,
 335                           &ss_length);
 336         if (ret == -1) {
 337                 goto error;
 338         }
 339         ss_length = sizeof(cli->conn.remote_ss);
 340         ret = getpeername(fd,
 341                           (struct sockaddr *)(void *)&cli->conn.remote_ss,
 342                           &ss_length);
 343         if (ret == -1) {
 344                 goto error;
 345         }
 346
 347         cli->smb1.pid = (uint16_t)sys_getpid();
 348         cli->smb1.vc_num = cli->smb1.pid;
 349         cli->smb1.tid = UINT16_MAX;
 350         cli->smb1.uid = UID_FIELD_INVALID;
 351
 352         cli->initialised = 1;
 353         return cli;
 354
 355         /* Clean up after malloc() error */
 356
 357  error:
 358
 359         TALLOC_FREE(cli);
 360         return NULL;
 361 }
 362
 363 bool cli_state_encryption_on(struct cli_state *cli)
 364 {
 365         return common_encryption_on(cli->trans_enc_state);
 366 }
 367
 368
 369 /****************************************************************************
 370  Close all pipes open on this session.
 371 ****************************************************************************/
 372
 373 void cli_nt_pipes_close(struct cli_state *cli)
 374 {
 375         while (cli->pipe_list != NULL) {
 376                 /*
 377                  * No TALLOC_FREE here!
 378                  */
 379                 talloc_free(cli->pipe_list);
 380         }
 381 }
 382
 383 /****************************************************************************
 384  Shutdown a client structure.
 385 ****************************************************************************/
 386
 387 static void _cli_shutdown(struct cli_state *cli)
 388 {
 389         cli_nt_pipes_close(cli);
 390
 391         /*
 392          * tell our peer to free his resources.  Wihtout this, when an
 393          * application attempts to do a graceful shutdown and calls
 394          * smbc_free_context() to clean up all connections, some connections
 395          * can remain active on the peer end, until some (long) timeout period
 396          * later.  This tree disconnect forces the peer to clean up, since the
 397          * connection will be going away.
 398          */
 399         if (cli_state_has_tcon(cli)) {
 400                 cli_tdis(cli);
 401         }
 402
 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->conn.smb1.server.session_key;
 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->conn.smb1.server.max_mux;
 567 }
 568
 569 const uint8_t *cli_state_server_challenge(struct cli_state *cli)
 570 {
 571         return cli->conn.smb1.server.challenge;
 572 }
 573
 574 const DATA_BLOB *cli_state_server_gss_blob(struct cli_state *cli)
 575 {
 576         return &cli->conn.smb1.server.gss_blob;
 577 }
 578
 579 uint16_t cli_state_security_mode(struct cli_state *cli)
 580 {
 581         return cli->conn.smb1.server.security_mode;
 582 }
 583
 584 int cli_state_server_time_zone(struct cli_state *cli)
 585 {
 586         return cli->conn.smb1.server.time_zone;
 587 }
 588
 589 time_t cli_state_server_time(struct cli_state *cli)
 590 {
 591         return cli->conn.smb1.server.system_time;
 592 }
 593
 594 struct cli_echo_state {
 595         uint16_t vwv[1];
 596         DATA_BLOB data;
 597         int num_echos;
 598 };
 599
 600 static void cli_echo_done(struct tevent_req *subreq);
 601
 602 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 603                                  struct cli_state *cli, uint16_t num_echos,
 604                                  DATA_BLOB data)
 605 {
 606         struct tevent_req *req, *subreq;
 607         struct cli_echo_state *state;
 608
 609         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 610         if (req == NULL) {
 611                 return NULL;
 612         }
 613         SSVAL(state->vwv, 0, num_echos);
 614         state->data = data;
 615         state->num_echos = num_echos;
 616
 617         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 618                               data.length, data.data);
 619         if (subreq == NULL) {
 620                 goto fail;
 621         }
 622         tevent_req_set_callback(subreq, cli_echo_done, req);
 623         return req;
 624  fail:
 625         TALLOC_FREE(req);
 626         return NULL;
 627 }
 628
 629 static void cli_echo_done(struct tevent_req *subreq)
 630 {
 631         struct tevent_req *req = tevent_req_callback_data(
 632                 subreq, struct tevent_req);
 633         struct cli_echo_state *state = tevent_req_data(
 634                 req, struct cli_echo_state);
 635         NTSTATUS status;
 636         uint32_t num_bytes;
 637         uint8_t *bytes;
 638         uint8_t *inbuf;
 639
 640         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 641                               &num_bytes, &bytes);
 642         if (!NT_STATUS_IS_OK(status)) {
 643                 tevent_req_nterror(req, status);
 644                 return;
 645         }
 646         if ((num_bytes != state->data.length)
 647             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 648                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 649                 return;
 650         }
 651
 652         state->num_echos -=1;
 653         if (state->num_echos == 0) {
 654                 tevent_req_done(req);
 655                 return;
 656         }
 657
 658         if (!cli_smb_req_set_pending(subreq)) {
 659                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 660                 return;
 661         }
 662 }
 663
 664 /**
 665  * Get the result out from an echo request
 666  * @param[in] req       The async_req from cli_echo_send
 667  * @retval Did the server reply correctly?
 668  */
 669
 670 NTSTATUS cli_echo_recv(struct tevent_req *req)
 671 {
 672         return tevent_req_simple_recv_ntstatus(req);
 673 }
 674
 675 /**
 676  * @brief Send/Receive SMBEcho requests
 677  * @param[in] mem_ctx   The memory context to put the async_req on
 678  * @param[in] ev        The event context that will call us back
 679  * @param[in] cli       The connection to send the echo to
 680  * @param[in] num_echos How many times do we want to get the reply?
 681  * @param[in] data      The data we want to get back
 682  * @retval Did the server reply correctly?
 683  */
 684
 685 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 686 {
 687         TALLOC_CTX *frame = talloc_stackframe();
 688         struct event_context *ev;
 689         struct tevent_req *req;
 690         NTSTATUS status = NT_STATUS_OK;
 691
 692         if (cli_has_async_calls(cli)) {
 693                 /*
 694                  * Can't use sync call while an async call is in flight
 695                  */
 696                 status = NT_STATUS_INVALID_PARAMETER;
 697                 goto fail;
 698         }
 699
 700         ev = event_context_init(frame);
 701         if (ev == NULL) {
 702                 status = NT_STATUS_NO_MEMORY;
 703                 goto fail;
 704         }
 705
 706         req = cli_echo_send(frame, ev, cli, num_echos, data);
 707         if (req == NULL) {
 708                 status = NT_STATUS_NO_MEMORY;
 709                 goto fail;
 710         }
 711
 712         if (!tevent_req_poll(req, ev)) {
 713                 status = map_nt_error_from_unix(errno);
 714                 goto fail;
 715         }
 716
 717         status = cli_echo_recv(req);
 718  fail:
 719         TALLOC_FREE(frame);
 720         return status;
 721 }
 722
 723 /**
 724  * Is the SMB command able to hold an AND_X successor
 725  * @param[in] cmd       The SMB command in question
 726  * @retval Can we add a chained request after "cmd"?
 727  */
 728 bool is_andx_req(uint8_t cmd)
 729 {
 730         switch (cmd) {
 731         case SMBtconX:
 732         case SMBlockingX:
 733         case SMBopenX:
 734         case SMBreadX:
 735         case SMBwriteX:
 736         case SMBsesssetupX:
 737         case SMBulogoffX:
 738         case SMBntcreateX:
 739                 return true;
 740                 break;
 741         default:
 742                 break;
 743         }
 744
 745         return false;
 746 }
 747
 748 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 749                  uint8_t smb_command, uint8_t additional_flags,
 750                  uint8_t wct, uint16_t *vwv,
 751                  uint32_t num_bytes, const uint8_t *bytes,
 752                  struct tevent_req **result_parent,
 753                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 754                  uint32_t *pnum_bytes, uint8_t **pbytes)
 755 {
 756         struct tevent_context *ev;
 757         struct tevent_req *req = NULL;
 758         NTSTATUS status = NT_STATUS_NO_MEMORY;
 759
 760         if (cli_has_async_calls(cli)) {
 761                 return NT_STATUS_INVALID_PARAMETER;
 762         }
 763         ev = tevent_context_init(mem_ctx);
 764         if (ev == NULL) {
 765                 goto fail;
 766         }
 767         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 768                            wct, vwv, num_bytes, bytes);
 769         if (req == NULL) {
 770                 goto fail;
 771         }
 772         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 773                 goto fail;
 774         }
 775         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 776                               pnum_bytes, pbytes);
 777 fail:
 778         TALLOC_FREE(ev);
 779         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 780                 *result_parent = req;
 781         }
 782         return status;
 783 }