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->server_domain = talloc_strdup(cli, "");
 194         if (!cli->server_domain) {
 195                 goto error;
 196         }
 197         cli->server_os = talloc_strdup(cli, "");
 198         if (!cli->server_os) {
 199                 goto error;
 200         }
 201         cli->server_type = talloc_strdup(cli, "");
 202         if (!cli->server_type) {
 203                 goto error;
 204         }
 205
 206         cli->dfs_mountpoint = talloc_strdup(cli, "");
 207         if (!cli->dfs_mountpoint) {
 208                 goto error;
 209         }
 210         cli->raw_status = NT_STATUS_INTERNAL_ERROR;
 211         cli->map_dos_errors = true; /* remove this */
 212         cli->timeout = 20000; /* Timeout is in milliseconds. */
 213         cli->case_sensitive = false;
 214
 215         /* Set the CLI_FORCE_DOSERR environment variable to test
 216            client routines using DOS errors instead of STATUS32
 217            ones.  This intended only as a temporary hack. */
 218         if (getenv("CLI_FORCE_DOSERR")) {
 219                 force_dos_errors = true;
 220         }
 221         if (flags & CLI_FULL_CONNECTION_FORCE_DOS_ERRORS) {
 222                 force_dos_errors = true;
 223         }
 224
 225         if (getenv("CLI_FORCE_ASCII")) {
 226                 force_ascii = true;
 227         }
 228         if (flags & CLI_FULL_CONNECTION_FORCE_ASCII) {
 229                 force_ascii = true;
 230         }
 231
 232         if (flags & CLI_FULL_CONNECTION_DONT_SPNEGO) {
 233                 use_spnego = false;
 234         } else if (flags & CLI_FULL_CONNECTION_USE_KERBEROS) {
 235                 cli->use_kerberos = true;
 236         }
 237         if ((flags & CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS) &&
 238              cli->use_kerberos) {
 239                 cli->fallback_after_kerberos = true;
 240         }
 241
 242         if (flags & CLI_FULL_CONNECTION_USE_CCACHE) {
 243                 cli->use_ccache = true;
 244         }
 245
 246         if (flags & CLI_FULL_CONNECTION_OPLOCKS) {
 247                 cli->use_oplocks = true;
 248         }
 249         if (flags & CLI_FULL_CONNECTION_LEVEL_II_OPLOCKS) {
 250                 use_level_II_oplocks = true;
 251         }
 252
 253         if (signing_state == SMB_SIGNING_DEFAULT) {
 254                 signing_state = lp_client_signing();
 255         }
 256
 257         switch (signing_state) {
 258         case SMB_SIGNING_OFF:
 259                 /* never */
 260                 allow_smb_signing = false;
 261                 desire_smb_signing = false;
 262                 mandatory_signing = false;
 263                 break;
 264         default:
 265         case SMB_SIGNING_DEFAULT:
 266         case SMB_SIGNING_IF_REQUIRED:
 267                 allow_smb_signing = true;
 268                 desire_smb_signing = false;
 269                 mandatory_signing = false;
 270                 break;
 271         case SMB_SIGNING_REQUIRED:
 272                 /* always */
 273                 allow_smb_signing = true;
 274                 desire_smb_signing = true;
 275                 mandatory_signing = true;
 276                 break;
 277         }
 278
 279         /* initialise signing */
 280         cli->signing_state = smb_signing_init(cli,
 281                                               allow_smb_signing,
 282                                               desire_smb_signing,
 283                                               mandatory_signing);
 284         if (!cli->signing_state) {
 285                 goto error;
 286         }
 287
 288         cli->conn.smb1.client.capabilities = 0;
 289         cli->conn.smb1.client.capabilities |= CAP_LARGE_FILES;
 290         cli->conn.smb1.client.capabilities |= CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 291         cli->conn.smb1.client.capabilities |= CAP_LOCK_AND_READ | CAP_NT_FIND;
 292         cli->conn.smb1.client.capabilities |= CAP_DFS | CAP_W2K_SMBS;
 293         cli->conn.smb1.client.capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX;
 294         cli->conn.smb1.client.capabilities |= CAP_LWIO;
 295
 296         if (!force_dos_errors) {
 297                 cli->conn.smb1.client.capabilities |= CAP_STATUS32;
 298         }
 299
 300         if (!force_ascii) {
 301                 cli->conn.smb1.client.capabilities |= CAP_UNICODE;
 302         }
 303
 304         if (use_spnego) {
 305                 cli->conn.smb1.client.capabilities |= CAP_EXTENDED_SECURITY;
 306         }
 307
 308         if (use_level_II_oplocks) {
 309                 cli->conn.smb1.client.capabilities |= CAP_LEVEL_II_OPLOCKS;
 310         }
 311
 312         cli->conn.smb1.client.max_xmit = CLI_BUFFER_SIZE;
 313
 314         cli->conn.smb1.capabilities = cli->conn.smb1.client.capabilities;
 315         cli->conn.smb1.max_xmit = 1024;
 316
 317         cli->conn.smb1.mid = 1;
 318
 319         cli->conn.outgoing = tevent_queue_create(cli, "cli_outgoing");
 320         if (cli->conn.outgoing == NULL) {
 321                 goto error;
 322         }
 323         cli->conn.pending = NULL;
 324
 325         cli->conn.remote_name = talloc_strdup(cli, remote_name);
 326         if (cli->conn.remote_name == NULL) {
 327                 goto error;
 328         }
 329
 330         if (remote_realm) {
 331                 cli->conn.remote_realm = talloc_strdup(cli, remote_realm);
 332                 if (cli->conn.remote_realm == NULL) {
 333                         goto error;
 334                 }
 335         }
 336
 337         cli->conn.fd = fd;
 338
 339         ss_length = sizeof(cli->conn.local_ss);
 340         ret = getsockname(fd,
 341                           (struct sockaddr *)(void *)&cli->conn.local_ss,
 342                           &ss_length);
 343         if (ret == -1) {
 344                 goto error;
 345         }
 346         ss_length = sizeof(cli->conn.remote_ss);
 347         ret = getpeername(fd,
 348                           (struct sockaddr *)(void *)&cli->conn.remote_ss,
 349                           &ss_length);
 350         if (ret == -1) {
 351                 goto error;
 352         }
 353
 354         cli->smb1.pid = (uint16_t)sys_getpid();
 355         cli->smb1.vc_num = cli->smb1.pid;
 356         cli->smb1.tid = UINT16_MAX;
 357         cli->smb1.uid = UID_FIELD_INVALID;
 358
 359         cli->initialised = 1;
 360         return cli;
 361
 362         /* Clean up after malloc() error */
 363
 364  error:
 365
 366         TALLOC_FREE(cli);
 367         return NULL;
 368 }
 369
 370 bool cli_state_encryption_on(struct cli_state *cli)
 371 {
 372         return common_encryption_on(cli->trans_enc_state);
 373 }
 374
 375
 376 /****************************************************************************
 377  Close all pipes open on this session.
 378 ****************************************************************************/
 379
 380 void cli_nt_pipes_close(struct cli_state *cli)
 381 {
 382         while (cli->pipe_list != NULL) {
 383                 /*
 384                  * No TALLOC_FREE here!
 385                  */
 386                 talloc_free(cli->pipe_list);
 387         }
 388 }
 389
 390 /****************************************************************************
 391  Shutdown a client structure.
 392 ****************************************************************************/
 393
 394 static void _cli_shutdown(struct cli_state *cli)
 395 {
 396         cli_nt_pipes_close(cli);
 397
 398         /*
 399          * tell our peer to free his resources.  Wihtout this, when an
 400          * application attempts to do a graceful shutdown and calls
 401          * smbc_free_context() to clean up all connections, some connections
 402          * can remain active on the peer end, until some (long) timeout period
 403          * later.  This tree disconnect forces the peer to clean up, since the
 404          * connection will be going away.
 405          */
 406         if (cli_state_has_tcon(cli)) {
 407                 cli_tdis(cli);
 408         }
 409
 410         data_blob_free(&cli->user_session_key);
 411
 412         cli_state_disconnect(cli);
 413
 414         /*
 415          * Need to free pending first, they remove themselves
 416          */
 417         while (cli->conn.pending) {
 418                 talloc_free(cli->conn.pending[0]);
 419         }
 420         TALLOC_FREE(cli);
 421 }
 422
 423 void cli_shutdown(struct cli_state *cli)
 424 {
 425         struct cli_state *cli_head;
 426         if (cli == NULL) {
 427                 return;
 428         }
 429         DLIST_HEAD(cli, cli_head);
 430         if (cli_head == cli) {
 431                 /*
 432                  * head of a DFS list, shutdown all subsidiary DFS
 433                  * connections.
 434                  */
 435                 struct cli_state *p, *next;
 436
 437                 for (p = cli_head->next; p; p = next) {
 438                         next = p->next;
 439                         DLIST_REMOVE(cli_head, p);
 440                         _cli_shutdown(p);
 441                 }
 442         } else {
 443                 DLIST_REMOVE(cli_head, cli);
 444         }
 445
 446         _cli_shutdown(cli);
 447 }
 448
 449 /****************************************************************************
 450  Set socket options on a open connection.
 451 ****************************************************************************/
 452
 453 void cli_sockopt(struct cli_state *cli, const char *options)
 454 {
 455         set_socket_options(cli->conn.fd, options);
 456 }
 457
 458 const struct sockaddr_storage *cli_state_local_sockaddr(struct cli_state *cli)
 459 {
 460         return &cli->conn.local_ss;
 461 }
 462
 463 const struct sockaddr_storage *cli_state_remote_sockaddr(struct cli_state *cli)
 464 {
 465         return &cli->conn.remote_ss;
 466 }
 467
 468 const char *cli_state_remote_name(struct cli_state *cli)
 469 {
 470         return cli->conn.remote_name;
 471 }
 472
 473 const char *cli_state_remote_realm(struct cli_state *cli)
 474 {
 475         return cli->conn.remote_realm;
 476 }
 477
 478 uint16_t cli_state_get_vc_num(struct cli_state *cli)
 479 {
 480         return cli->smb1.vc_num;
 481 }
 482
 483 uint32_t cli_state_server_session_key(struct cli_state *cli)
 484 {
 485         return cli->conn.smb1.server.session_key;
 486 }
 487
 488 /****************************************************************************
 489  Set the PID to use for smb messages. Return the old pid.
 490 ****************************************************************************/
 491
 492 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 493 {
 494         uint16_t ret = cli->smb1.pid;
 495         cli->smb1.pid = pid;
 496         return ret;
 497 }
 498
 499 uint16_t cli_getpid(struct cli_state *cli)
 500 {
 501         return cli->smb1.pid;
 502 }
 503
 504 bool cli_state_has_tcon(struct cli_state *cli)
 505 {
 506         if (cli->smb1.tid == UINT16_MAX) {
 507                 return false;
 508         }
 509
 510         return true;
 511 }
 512
 513 uint16_t cli_state_get_tid(struct cli_state *cli)
 514 {
 515         return cli->smb1.tid;
 516 }
 517
 518 uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid)
 519 {
 520         uint16_t ret = cli->smb1.tid;
 521         cli->smb1.tid = tid;
 522         return ret;
 523 }
 524
 525 uint16_t cli_state_get_uid(struct cli_state *cli)
 526 {
 527         return cli->smb1.uid;
 528 }
 529
 530 uint16_t cli_state_set_uid(struct cli_state *cli, uint16_t uid)
 531 {
 532         uint16_t ret = cli->smb1.uid;
 533         cli->smb1.uid = uid;
 534         return ret;
 535 }
 536
 537 /****************************************************************************
 538  Set the case sensitivity flag on the packets. Returns old state.
 539 ****************************************************************************/
 540
 541 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 542 {
 543         bool ret = cli->case_sensitive;
 544         cli->case_sensitive = case_sensitive;
 545         return ret;
 546 }
 547
 548 enum protocol_types cli_state_protocol(struct cli_state *cli)
 549 {
 550         return cli->conn.protocol;
 551 }
 552
 553 uint32_t cli_state_capabilities(struct cli_state *cli)
 554 {
 555         return cli->conn.smb1.capabilities;
 556 }
 557
 558 uint32_t cli_state_available_size(struct cli_state *cli, uint32_t ofs)
 559 {
 560         uint32_t ret = cli->conn.smb1.max_xmit;
 561
 562         if (ofs >= ret) {
 563                 return 0;
 564         }
 565
 566         ret -= ofs;
 567
 568         return ret;
 569 }
 570
 571 uint16_t cli_state_max_requests(struct cli_state *cli)
 572 {
 573         return cli->conn.smb1.server.max_mux;
 574 }
 575
 576 const uint8_t *cli_state_server_challenge(struct cli_state *cli)
 577 {
 578         return cli->conn.smb1.server.challenge;
 579 }
 580
 581 const DATA_BLOB *cli_state_server_gss_blob(struct cli_state *cli)
 582 {
 583         return &cli->conn.smb1.server.gss_blob;
 584 }
 585
 586 uint16_t cli_state_security_mode(struct cli_state *cli)
 587 {
 588         return cli->conn.smb1.server.security_mode;
 589 }
 590
 591 int cli_state_server_time_zone(struct cli_state *cli)
 592 {
 593         return cli->conn.smb1.server.time_zone;
 594 }
 595
 596 time_t cli_state_server_time(struct cli_state *cli)
 597 {
 598         return cli->conn.smb1.server.system_time;
 599 }
 600
 601 struct cli_echo_state {
 602         uint16_t vwv[1];
 603         DATA_BLOB data;
 604         int num_echos;
 605 };
 606
 607 static void cli_echo_done(struct tevent_req *subreq);
 608
 609 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 610                                  struct cli_state *cli, uint16_t num_echos,
 611                                  DATA_BLOB data)
 612 {
 613         struct tevent_req *req, *subreq;
 614         struct cli_echo_state *state;
 615
 616         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 617         if (req == NULL) {
 618                 return NULL;
 619         }
 620         SSVAL(state->vwv, 0, num_echos);
 621         state->data = data;
 622         state->num_echos = num_echos;
 623
 624         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 625                               data.length, data.data);
 626         if (subreq == NULL) {
 627                 goto fail;
 628         }
 629         tevent_req_set_callback(subreq, cli_echo_done, req);
 630         return req;
 631  fail:
 632         TALLOC_FREE(req);
 633         return NULL;
 634 }
 635
 636 static void cli_echo_done(struct tevent_req *subreq)
 637 {
 638         struct tevent_req *req = tevent_req_callback_data(
 639                 subreq, struct tevent_req);
 640         struct cli_echo_state *state = tevent_req_data(
 641                 req, struct cli_echo_state);
 642         NTSTATUS status;
 643         uint32_t num_bytes;
 644         uint8_t *bytes;
 645         uint8_t *inbuf;
 646
 647         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 648                               &num_bytes, &bytes);
 649         if (!NT_STATUS_IS_OK(status)) {
 650                 tevent_req_nterror(req, status);
 651                 return;
 652         }
 653         if ((num_bytes != state->data.length)
 654             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 655                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 656                 return;
 657         }
 658
 659         state->num_echos -=1;
 660         if (state->num_echos == 0) {
 661                 tevent_req_done(req);
 662                 return;
 663         }
 664
 665         if (!cli_smb_req_set_pending(subreq)) {
 666                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 667                 return;
 668         }
 669 }
 670
 671 /**
 672  * Get the result out from an echo request
 673  * @param[in] req       The async_req from cli_echo_send
 674  * @retval Did the server reply correctly?
 675  */
 676
 677 NTSTATUS cli_echo_recv(struct tevent_req *req)
 678 {
 679         return tevent_req_simple_recv_ntstatus(req);
 680 }
 681
 682 /**
 683  * @brief Send/Receive SMBEcho requests
 684  * @param[in] mem_ctx   The memory context to put the async_req on
 685  * @param[in] ev        The event context that will call us back
 686  * @param[in] cli       The connection to send the echo to
 687  * @param[in] num_echos How many times do we want to get the reply?
 688  * @param[in] data      The data we want to get back
 689  * @retval Did the server reply correctly?
 690  */
 691
 692 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 693 {
 694         TALLOC_CTX *frame = talloc_stackframe();
 695         struct event_context *ev;
 696         struct tevent_req *req;
 697         NTSTATUS status = NT_STATUS_OK;
 698
 699         if (cli_has_async_calls(cli)) {
 700                 /*
 701                  * Can't use sync call while an async call is in flight
 702                  */
 703                 status = NT_STATUS_INVALID_PARAMETER;
 704                 goto fail;
 705         }
 706
 707         ev = event_context_init(frame);
 708         if (ev == NULL) {
 709                 status = NT_STATUS_NO_MEMORY;
 710                 goto fail;
 711         }
 712
 713         req = cli_echo_send(frame, ev, cli, num_echos, data);
 714         if (req == NULL) {
 715                 status = NT_STATUS_NO_MEMORY;
 716                 goto fail;
 717         }
 718
 719         if (!tevent_req_poll(req, ev)) {
 720                 status = map_nt_error_from_unix(errno);
 721                 goto fail;
 722         }
 723
 724         status = cli_echo_recv(req);
 725  fail:
 726         TALLOC_FREE(frame);
 727         return status;
 728 }
 729
 730 /**
 731  * Is the SMB command able to hold an AND_X successor
 732  * @param[in] cmd       The SMB command in question
 733  * @retval Can we add a chained request after "cmd"?
 734  */
 735 bool is_andx_req(uint8_t cmd)
 736 {
 737         switch (cmd) {
 738         case SMBtconX:
 739         case SMBlockingX:
 740         case SMBopenX:
 741         case SMBreadX:
 742         case SMBwriteX:
 743         case SMBsesssetupX:
 744         case SMBulogoffX:
 745         case SMBntcreateX:
 746                 return true;
 747                 break;
 748         default:
 749                 break;
 750         }
 751
 752         return false;
 753 }
 754
 755 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 756                  uint8_t smb_command, uint8_t additional_flags,
 757                  uint8_t wct, uint16_t *vwv,
 758                  uint32_t num_bytes, const uint8_t *bytes,
 759                  struct tevent_req **result_parent,
 760                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 761                  uint32_t *pnum_bytes, uint8_t **pbytes)
 762 {
 763         struct tevent_context *ev;
 764         struct tevent_req *req = NULL;
 765         NTSTATUS status = NT_STATUS_NO_MEMORY;
 766
 767         if (cli_has_async_calls(cli)) {
 768                 return NT_STATUS_INVALID_PARAMETER;
 769         }
 770         ev = tevent_context_init(mem_ctx);
 771         if (ev == NULL) {
 772                 goto fail;
 773         }
 774         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 775                            wct, vwv, num_bytes, bytes);
 776         if (req == NULL) {
 777                 goto fail;
 778         }
 779         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 780                 goto fail;
 781         }
 782         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 783                               pnum_bytes, pbytes);
 784 fail:
 785         TALLOC_FREE(ev);
 786         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 787                 *result_parent = req;
 788         }
 789         return status;
 790 }