source/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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern int smb_read_error;
  25
  26 /****************************************************************************
  27  Change the timeout (in milliseconds).
  28 ****************************************************************************/
  29
  30 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  31 {
  32         unsigned int old_timeout = cli->timeout;
  33         cli->timeout = timeout;
  34         return old_timeout;
  35 }
  36
  37 /****************************************************************************
  38  Change the port number used to call on.
  39 ****************************************************************************/
  40
  41 int cli_set_port(struct cli_state *cli, int port)
  42 {
  43         cli->port = port;
  44         return port;
  45 }
  46
  47 /****************************************************************************
  48  Read an smb from a fd ignoring all keepalive packets. Note that the buffer
  49  *MUST* be of size BUFFER_SIZE+SAFETY_MARGIN.
  50  The timeout is in milliseconds
  51
  52  This is exactly the same as receive_smb except that it can be set to never return
  53  a session keepalive packet (just as receive_smb used to do).
  54  receive_smb was changed to return keepalives as the oplock processing means this call
  55  should never go into a blocking read.
  56 ****************************************************************************/
  57
  58 static ssize_t client_receive_smb(struct cli_state *cli, BOOL eat_keepalives, size_t maxlen)
  59 {
  60         ssize_t len;
  61         int fd = cli->fd;
  62         char *buffer = cli->inbuf;
  63         unsigned int timeout = cli->timeout;
  64
  65         for(;;) {
  66                 len = receive_smb_raw(fd, buffer, timeout, maxlen);
  67
  68                 if (len < 0) {
  69                         DEBUG(10,("client_receive_smb failed\n"));
  70                         show_msg(buffer);
  71                         return len;
  72                 }
  73
  74                 /* Ignore session keepalive packets. */
  75                 if (eat_keepalives && (CVAL(buffer,0) == SMBkeepalive)) {
  76                         continue;
  77                 }
  78                 break;
  79         }
  80
  81         if (cli_encryption_on(cli)) {
  82                 NTSTATUS status = cli_decrypt_message(cli);
  83                 if (!NT_STATUS_IS_OK(status)) {
  84                         DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
  85                                 nt_errstr(status)));
  86                         cli->smb_rw_error = READ_BAD_DECRYPT;
  87                         close(cli->fd);
  88                         cli->fd = -1;
  89                         return -1;
  90                 }
  91         }
  92         show_msg(buffer);
  93         return len;
  94 }
  95
  96 /****************************************************************************
  97  Recv an smb.
  98 ****************************************************************************/
  99
 100 BOOL cli_receive_smb_internal(struct cli_state *cli, BOOL eat_keepalives)
 101 {
 102         ssize_t len;
 103
 104         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 105         if (cli->fd == -1)
 106                 return False;
 107
 108  again:
 109         len = client_receive_smb(cli, eat_keepalives, 0);
 110
 111         if (len >= 0 && !eat_keepalives && (CVAL(cli->inbuf,0) == SMBkeepalive)) {
 112                 /* Give back the keepalive. */
 113                 return True;
 114         }
 115
 116         if (len > 0) {
 117                 /* it might be an oplock break request */
 118                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
 119                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
 120                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
 121                     SVAL(cli->inbuf,smb_vwv7) == 0) {
 122                         if (cli->oplock_handler) {
 123                                 int fnum = SVAL(cli->inbuf,smb_vwv2);
 124                                 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
 125                                 if (!cli->oplock_handler(cli, fnum, level)) {
 126                                         return False;
 127                                 }
 128                         }
 129                         /* try to prevent loops */
 130                         SCVAL(cli->inbuf,smb_com,0xFF);
 131                         goto again;
 132                 }
 133         }
 134
 135         /* If the server is not responding, note that now */
 136         if (len <= 0) {
 137                 DEBUG(0, ("Receiving SMB: Server stopped responding\n"));
 138                 cli->smb_rw_error = smb_read_error;
 139                 close(cli->fd);
 140                 cli->fd = -1;
 141                 return False;
 142         }
 143
 144         if (!cli_check_sign_mac(cli)) {
 145                 /*
 146                  * If we get a signature failure in sessionsetup, then
 147                  * the server sometimes just reflects the sent signature
 148                  * back to us. Detect this and allow the upper layer to
 149                  * retrieve the correct Windows error message.
 150                  */
 151                 if (CVAL(cli->outbuf,smb_com) == SMBsesssetupX &&
 152                         (smb_len(cli->inbuf) > (smb_ss_field + 8 - 4)) &&
 153                         (SVAL(cli->inbuf,smb_flg2) & FLAGS2_SMB_SECURITY_SIGNATURES) &&
 154                         memcmp(&cli->outbuf[smb_ss_field],&cli->inbuf[smb_ss_field],8) == 0 &&
 155                         cli_is_error(cli)) {
 156
 157                         /*
 158                          * Reflected signature on login error.
 159                          * Set bad sig but don't close fd.
 160                          */
 161                         cli->smb_rw_error = READ_BAD_SIG;
 162                         return True;
 163                 }
 164
 165                 DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
 166                 cli->smb_rw_error = READ_BAD_SIG;
 167                 close(cli->fd);
 168                 cli->fd = -1;
 169                 return False;
 170         }
 171
 172         return True;
 173 }
 174
 175 /****************************************************************************
 176  Recv an smb - eat keepalives.
 177 ****************************************************************************/
 178
 179 BOOL cli_receive_smb(struct cli_state *cli)
 180 {
 181         return cli_receive_smb_internal(cli, True);
 182 }
 183
 184 /****************************************************************************
 185  Recv an smb - return keepalives.
 186 ****************************************************************************/
 187
 188 BOOL cli_receive_smb_return_keepalive(struct cli_state *cli)
 189 {
 190         return cli_receive_smb_internal(cli, False);
 191 }
 192
 193 /****************************************************************************
 194  Recv an smb session reply
 195 ****************************************************************************/
 196
 197 BOOL cli_receive_sessionreply(struct cli_state *cli)
 198 {
 199         ssize_t len;
 200
 201         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 202         if (cli->fd == -1)
 203                 return False;
 204
 205         len = client_receive_smb(cli, False, 0);
 206
 207         /* If the server is not responding, note that now */
 208         if (len < 0) {
 209                 DEBUG(0, ("Receiving SMB: Server stopped responding\n"));
 210                 cli->smb_rw_error = smb_read_error;
 211                 close(cli->fd);
 212                 cli->fd = -1;
 213                 return False;
 214         }
 215
 216         return True;
 217 }
 218
 219 /****************************************************************************
 220  Read the data portion of a readX smb.
 221  The timeout is in milliseconds
 222 ****************************************************************************/
 223
 224 ssize_t cli_receive_smb_data(struct cli_state *cli, char *buffer, size_t len)
 225 {
 226         if (cli->timeout > 0) {
 227                 return read_socket_with_timeout(cli->fd, buffer, len, len, cli->timeout);
 228         } else {
 229                 return read_data(cli->fd, buffer, len);
 230         }
 231 }
 232
 233 /****************************************************************************
 234  Read a smb readX header.
 235  We can only use this if encryption and signing are off.
 236 ****************************************************************************/
 237
 238 BOOL cli_receive_smb_readX_header(struct cli_state *cli)
 239 {
 240         ssize_t len, offset;
 241
 242         if (cli->fd == -1)
 243                 return False;
 244
 245  again:
 246
 247         /* Read up to the size of a readX header reply. */
 248         len = client_receive_smb(cli, True, (smb_size - 4) + 24);
 249
 250         if (len > 0) {
 251                 /* it might be an oplock break request */
 252                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
 253                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
 254                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
 255                     SVAL(cli->inbuf,smb_vwv7) == 0) {
 256                         ssize_t total_len = smb_len(cli->inbuf);
 257
 258                         if (total_len > CLI_SAMBA_MAX_LARGE_READX_SIZE+SAFETY_MARGIN) {
 259                                 goto read_err;
 260                         }
 261
 262                         /* Read the rest of the data. */
 263                         if ((total_len - len > 0) &&
 264                             !cli_receive_smb_data(cli,cli->inbuf+len,total_len - len)) {
 265                                 goto read_err;
 266                         }
 267
 268                         if (cli->oplock_handler) {
 269                                 int fnum = SVAL(cli->inbuf,smb_vwv2);
 270                                 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
 271                                 if (!cli->oplock_handler(cli, fnum, level)) return False;
 272                         }
 273                         /* try to prevent loops */
 274                         SCVAL(cli->inbuf,smb_com,0xFF);
 275                         goto again;
 276                 }
 277         }
 278
 279         /* If it's not the above size it probably was an error packet. */
 280
 281         if ((len == (smb_size - 4) + 24) && !cli_is_error(cli)) {
 282                 /* Check it's a non-chained readX reply. */
 283                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) ||
 284                         (CVAL(cli->inbuf,smb_vwv0) != 0xFF) ||
 285                         (CVAL(cli->inbuf,smb_com) != SMBreadX)) {
 286                         /*
 287                          * We're not coping here with asnyc replies to
 288                          * other calls. Punt here - we need async client
 289                          * libs for this.
 290                          */
 291                         goto read_err;
 292                 }
 293
 294                 /*
 295                  * We know it's a readX reply - ensure we've read the
 296                  * padding bytes also.
 297                  */
 298
 299                 offset = SVAL(cli->inbuf,smb_vwv6);
 300                 if (offset > len) {
 301                         ssize_t ret;
 302                         size_t padbytes = offset - len;
 303                         ret = cli_receive_smb_data(cli,smb_buf(cli->inbuf),padbytes);
 304                         if (ret != padbytes) {
 305                                 goto read_err;
 306                         }
 307                 }
 308         }
 309
 310         return True;
 311
 312   read_err:
 313
 314         cli->smb_rw_error = smb_read_error = READ_ERROR;
 315         close(cli->fd);
 316         cli->fd = -1;
 317         return False;
 318 }
 319
 320 static ssize_t write_socket(int fd, const char *buf, size_t len)
 321 {
 322         ssize_t ret=0;
 323
 324         DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
 325         ret = write_data(fd,buf,len);
 326
 327         DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
 328         if(ret <= 0)
 329                 DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
 330                         (int)len, fd, strerror(errno) ));
 331
 332         return(ret);
 333 }
 334
 335 /****************************************************************************
 336  Send an smb to a fd.
 337 ****************************************************************************/
 338
 339 BOOL cli_send_smb(struct cli_state *cli)
 340 {
 341         size_t len;
 342         size_t nwritten=0;
 343         ssize_t ret;
 344         char *buf_out = cli->outbuf;
 345         BOOL enc_on = cli_encryption_on(cli);
 346
 347         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 348         if (cli->fd == -1) {
 349                 return False;
 350         }
 351
 352         cli_calculate_sign_mac(cli);
 353
 354         if (enc_on) {
 355                 NTSTATUS status = cli_encrypt_message(cli, &buf_out);
 356                 if (!NT_STATUS_IS_OK(status)) {
 357                         close(cli->fd);
 358                         cli->fd = -1;
 359                         cli->smb_rw_error = WRITE_ERROR;
 360                         DEBUG(0,("Error in encrypting client message. Error %s\n",
 361                                 nt_errstr(status) ));
 362                         return False;
 363                 }
 364         }
 365
 366         len = smb_len(buf_out) + 4;
 367
 368         while (nwritten < len) {
 369                 ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
 370                 if (ret <= 0) {
 371                         if (enc_on) {
 372                                 cli_free_enc_buffer(cli, buf_out);
 373                         }
 374                         close(cli->fd);
 375                         cli->fd = -1;
 376                         cli->smb_rw_error = WRITE_ERROR;
 377                         DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
 378                                 (int)len,(int)ret, strerror(errno) ));
 379                         return False;
 380                 }
 381                 nwritten += ret;
 382         }
 383
 384         cli_free_enc_buffer(cli, buf_out);
 385
 386         /* Increment the mid so we can tell between responses. */
 387         cli->mid++;
 388         if (!cli->mid) {
 389                 cli->mid++;
 390         }
 391         return True;
 392 }
 393
 394 /****************************************************************************
 395  Setup basics in a outgoing packet.
 396 ****************************************************************************/
 397
 398 void cli_setup_packet(struct cli_state *cli)
 399 {
 400         cli->rap_error = 0;
 401         SSVAL(cli->outbuf,smb_pid,cli->pid);
 402         SSVAL(cli->outbuf,smb_uid,cli->vuid);
 403         SSVAL(cli->outbuf,smb_mid,cli->mid);
 404         if (cli->protocol > PROTOCOL_CORE) {
 405                 uint16 flags2;
 406                 if (cli->case_sensitive) {
 407                         SCVAL(cli->outbuf,smb_flg,0x0);
 408                 } else {
 409                         /* Default setting, case insensitive. */
 410                         SCVAL(cli->outbuf,smb_flg,0x8);
 411                 }
 412                 flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 413                 if (cli->capabilities & CAP_UNICODE)
 414                         flags2 |= FLAGS2_UNICODE_STRINGS;
 415                 if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
 416                         flags2 |= FLAGS2_DFS_PATHNAMES;
 417                 if (cli->capabilities & CAP_STATUS32)
 418                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 419                 if (cli->use_spnego)
 420                         flags2 |= FLAGS2_EXTENDED_SECURITY;
 421                 SSVAL(cli->outbuf,smb_flg2, flags2);
 422         }
 423 }
 424
 425 /****************************************************************************
 426  Setup the bcc length of the packet from a pointer to the end of the data.
 427 ****************************************************************************/
 428
 429 void cli_setup_bcc(struct cli_state *cli, void *p)
 430 {
 431         set_message_bcc(NULL,cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 432 }
 433
 434 /****************************************************************************
 435  Initialise credentials of a client structure.
 436 ****************************************************************************/
 437
 438 void cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 439 {
 440         fstrcpy(cli->domain, domain);
 441         fstrcpy(cli->user_name, username);
 442         pwd_set_cleartext(&cli->pwd, password);
 443         if (!*username) {
 444                 cli->pwd.null_pwd = True;
 445         }
 446
 447         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 448 }
 449
 450 /****************************************************************************
 451  Set the signing state (used from the command line).
 452 ****************************************************************************/
 453
 454 void cli_setup_signing_state(struct cli_state *cli, int signing_state)
 455 {
 456         if (signing_state == Undefined)
 457                 return;
 458
 459         if (signing_state == False) {
 460                 cli->sign_info.allow_smb_signing = False;
 461                 cli->sign_info.mandatory_signing = False;
 462                 return;
 463         }
 464
 465         cli->sign_info.allow_smb_signing = True;
 466
 467         if (signing_state == Required)
 468                 cli->sign_info.mandatory_signing = True;
 469 }
 470
 471 /****************************************************************************
 472  Initialise a client structure. Always returns a malloc'ed struct.
 473 ****************************************************************************/
 474
 475 struct cli_state *cli_initialise(void)
 476 {
 477         struct cli_state *cli = NULL;
 478
 479         /* Check the effective uid - make sure we are not setuid */
 480         if (is_setuid_root()) {
 481                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 482                 return NULL;
 483         }
 484
 485         cli = SMB_MALLOC_P(struct cli_state);
 486         if (!cli) {
 487                 return NULL;
 488         }
 489
 490         ZERO_STRUCTP(cli);
 491
 492         cli->port = 0;
 493         cli->fd = -1;
 494         cli->cnum = -1;
 495         cli->pid = (uint16)sys_getpid();
 496         cli->mid = 1;
 497         cli->vuid = UID_FIELD_INVALID;
 498         cli->protocol = PROTOCOL_NT1;
 499         cli->timeout = 20000; /* Timeout is in milliseconds. */
 500         cli->bufsize = CLI_BUFFER_SIZE+4;
 501         cli->max_xmit = cli->bufsize;
 502         cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 503         cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 504         cli->oplock_handler = cli_oplock_ack;
 505         cli->case_sensitive = False;
 506         cli->smb_rw_error = 0;
 507
 508         cli->use_spnego = lp_client_use_spnego();
 509
 510         cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
 511
 512         /* Set the CLI_FORCE_DOSERR environment variable to test
 513            client routines using DOS errors instead of STATUS32
 514            ones.  This intended only as a temporary hack. */
 515         if (getenv("CLI_FORCE_DOSERR"))
 516                 cli->force_dos_errors = True;
 517
 518         if (lp_client_signing())
 519                 cli->sign_info.allow_smb_signing = True;
 520
 521         if (lp_client_signing() == Required)
 522                 cli->sign_info.mandatory_signing = True;
 523
 524         if (!cli->outbuf || !cli->inbuf)
 525                 goto error;
 526
 527         if ((cli->mem_ctx = talloc_init("cli based talloc")) == NULL)
 528                 goto error;
 529
 530         memset(cli->outbuf, 0, cli->bufsize);
 531         memset(cli->inbuf, 0, cli->bufsize);
 532
 533
 534 #if defined(DEVELOPER)
 535         /* just because we over-allocate, doesn't mean it's right to use it */
 536         clobber_region(FUNCTION_MACRO, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
 537         clobber_region(FUNCTION_MACRO, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
 538 #endif
 539
 540         /* initialise signing */
 541         cli_null_set_signing(cli);
 542
 543         cli->initialised = 1;
 544
 545         return cli;
 546
 547         /* Clean up after malloc() error */
 548
 549  error:
 550
 551         SAFE_FREE(cli->inbuf);
 552         SAFE_FREE(cli->outbuf);
 553         SAFE_FREE(cli);
 554         return NULL;
 555 }
 556
 557 /****************************************************************************
 558  External interface.
 559  Close an open named pipe over SMB. Free any authentication data.
 560  Returns False if the cli_close call failed.
 561  ****************************************************************************/
 562
 563 BOOL cli_rpc_pipe_close(struct rpc_pipe_client *cli)
 564 {
 565         BOOL ret;
 566
 567         if (!cli) {
 568                 return False;
 569         }
 570
 571         ret = cli_close(cli->cli, cli->fnum);
 572
 573         if (!ret) {
 574                 DEBUG(1,("cli_rpc_pipe_close: cli_close failed on pipe %s, "
 575                          "fnum 0x%x "
 576                          "to machine %s.  Error was %s\n",
 577                          cli->pipe_name,
 578                          (int) cli->fnum,
 579                          cli->cli->desthost,
 580                          cli_errstr(cli->cli)));
 581         }
 582
 583         if (cli->auth.cli_auth_data_free_func) {
 584                 (*cli->auth.cli_auth_data_free_func)(&cli->auth);
 585         }
 586
 587         DEBUG(10,("cli_rpc_pipe_close: closed pipe %s to machine %s\n",
 588                 cli->pipe_name, cli->cli->desthost ));
 589
 590         DLIST_REMOVE(cli->cli->pipe_list, cli);
 591         talloc_destroy(cli->mem_ctx);
 592         return ret;
 593 }
 594
 595 /****************************************************************************
 596  Close all pipes open on this session.
 597 ****************************************************************************/
 598
 599 void cli_nt_pipes_close(struct cli_state *cli)
 600 {
 601         struct rpc_pipe_client *cp, *next;
 602
 603         for (cp = cli->pipe_list; cp; cp = next) {
 604                 next = cp->next;
 605                 cli_rpc_pipe_close(cp);
 606         }
 607 }
 608
 609 /****************************************************************************
 610  Shutdown a client structure.
 611 ****************************************************************************/
 612
 613 void cli_shutdown(struct cli_state *cli)
 614 {
 615         cli_nt_pipes_close(cli);
 616
 617         /*
 618          * tell our peer to free his resources.  Wihtout this, when an
 619          * application attempts to do a graceful shutdown and calls
 620          * smbc_free_context() to clean up all connections, some connections
 621          * can remain active on the peer end, until some (long) timeout period
 622          * later.  This tree disconnect forces the peer to clean up, since the
 623          * connection will be going away.
 624          *
 625          * Also, do not do tree disconnect when cli->smb_rw_error is DO_NOT_DO_TDIS
 626          * the only user for this so far is smbmount which passes opened connection
 627          * down to kernel's smbfs module.
 628          */
 629         if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != DO_NOT_DO_TDIS ) ) {
 630                 cli_tdis(cli);
 631         }
 632
 633         SAFE_FREE(cli->outbuf);
 634         SAFE_FREE(cli->inbuf);
 635
 636         cli_free_signing_context(cli);
 637         cli_free_encryption_context(cli);
 638
 639         data_blob_free(&cli->secblob);
 640         data_blob_free(&cli->user_session_key);
 641
 642         if (cli->mem_ctx) {
 643                 talloc_destroy(cli->mem_ctx);
 644                 cli->mem_ctx = NULL;
 645         }
 646
 647         if (cli->fd != -1) {
 648                 close(cli->fd);
 649         }
 650         cli->fd = -1;
 651         cli->smb_rw_error = 0;
 652
 653         SAFE_FREE(cli);
 654 }
 655
 656 /****************************************************************************
 657  Set socket options on a open connection.
 658 ****************************************************************************/
 659
 660 void cli_sockopt(struct cli_state *cli, const char *options)
 661 {
 662         set_socket_options(cli->fd, options);
 663 }
 664
 665 /****************************************************************************
 666  Set the PID to use for smb messages. Return the old pid.
 667 ****************************************************************************/
 668
 669 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 670 {
 671         uint16 ret = cli->pid;
 672         cli->pid = pid;
 673         return ret;
 674 }
 675
 676 /****************************************************************************
 677  Set the case sensitivity flag on the packets. Returns old state.
 678 ****************************************************************************/
 679
 680 BOOL cli_set_case_sensitive(struct cli_state *cli, BOOL case_sensitive)
 681 {
 682         BOOL ret = cli->case_sensitive;
 683         cli->case_sensitive = case_sensitive;
 684         return ret;
 685 }
 686
 687 /****************************************************************************
 688 Send a keepalive packet to the server
 689 ****************************************************************************/
 690
 691 BOOL cli_send_keepalive(struct cli_state *cli)
 692 {
 693         if (cli->fd == -1) {
 694                 DEBUG(3, ("cli_send_keepalive: fd == -1\n"));
 695                 return False;
 696         }
 697         if (!send_keepalive(cli->fd)) {
 698                 close(cli->fd);
 699                 cli->fd = -1;
 700                 DEBUG(0,("Error sending keepalive packet to client.\n"));
 701                 return False;
 702         }
 703         return True;
 704 }
 705
 706 /****************************************************************************
 707  Send/receive a SMBecho command: ping the server
 708 ****************************************************************************/
 709
 710 BOOL cli_echo(struct cli_state *cli, unsigned char *data, size_t length)
 711 {
 712         char *p;
 713
 714         SMB_ASSERT(length < 1024);
 715
 716         memset(cli->outbuf,'\0',smb_size);
 717         set_message(NULL,cli->outbuf,1,length,True);
 718         SCVAL(cli->outbuf,smb_com,SMBecho);
 719         SSVAL(cli->outbuf,smb_tid,65535);
 720         SSVAL(cli->outbuf,smb_vwv0,1);
 721         cli_setup_packet(cli);
 722         p = smb_buf(cli->outbuf);
 723         memcpy(p, data, length);
 724         p += length;
 725
 726         cli_setup_bcc(cli, p);
 727
 728         cli_send_smb(cli);
 729         if (!cli_receive_smb(cli)) {
 730                 return False;
 731         }
 732
 733         if (cli_is_error(cli)) {
 734                 return False;
 735         }
 736         return True;
 737 }