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