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
  23 /*******************************************************************
  24  Setup the word count and byte count for a client smb message.
  25 ********************************************************************/
  26
  27 int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
  28 {
  29         if (zero && (num_words || num_bytes)) {
  30                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  31         }
  32         SCVAL(buf,smb_wct,num_words);
  33         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  34         smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
  35         return (smb_size + num_words*2 + num_bytes);
  36 }
  37
  38 /****************************************************************************
  39  Change the timeout (in milliseconds).
  40 ****************************************************************************/
  41
  42 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  43 {
  44         unsigned int old_timeout = cli->timeout;
  45         cli->timeout = timeout;
  46         return old_timeout;
  47 }
  48
  49 /****************************************************************************
  50  Change the port number used to call on.
  51 ****************************************************************************/
  52
  53 void cli_set_port(struct cli_state *cli, int port)
  54 {
  55         cli->port = port;
  56 }
  57
  58 /****************************************************************************
  59  convenience routine to find if we negotiated ucs2
  60 ****************************************************************************/
  61
  62 bool cli_ucs2(struct cli_state *cli)
  63 {
  64         return ((cli->capabilities & CAP_UNICODE) != 0);
  65 }
  66
  67
  68 /****************************************************************************
  69  Read an smb from a fd ignoring all keepalive packets.
  70  The timeout is in milliseconds
  71
  72  This is exactly the same as receive_smb except that it never returns
  73  a session keepalive packet (just as receive_smb used to do).
  74  receive_smb was changed to return keepalives as the oplock processing means this call
  75  should never go into a blocking read.
  76 ****************************************************************************/
  77
  78 static ssize_t client_receive_smb(struct cli_state *cli, size_t maxlen)
  79 {
  80         size_t len;
  81
  82         for(;;) {
  83                 NTSTATUS status;
  84
  85                 set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);
  86
  87                 status = receive_smb_raw(cli->fd, cli->inbuf, cli->bufsize,
  88                                         cli->timeout, maxlen, &len);
  89                 if (!NT_STATUS_IS_OK(status)) {
  90                         DEBUG(10,("client_receive_smb failed\n"));
  91                         show_msg(cli->inbuf);
  92
  93                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
  94                                 set_smb_read_error(&cli->smb_rw_error,
  95                                                    SMB_READ_EOF);
  96                                 return -1;
  97                         }
  98
  99                         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 100                                 set_smb_read_error(&cli->smb_rw_error,
 101                                                    SMB_READ_TIMEOUT);
 102                                 return -1;
 103                         }
 104
 105                         set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
 106                         return -1;
 107                 }
 108
 109                 /*
 110                  * I don't believe len can be < 0 with NT_STATUS_OK
 111                  * returned above, but this check doesn't hurt. JRA.
 112                  */
 113
 114                 if ((ssize_t)len < 0) {
 115                         return len;
 116                 }
 117
 118                 /* Ignore session keepalive packets. */
 119                 if(CVAL(cli->inbuf,0) != SMBkeepalive) {
 120                         break;
 121                 }
 122         }
 123
 124         if (cli_encryption_on(cli)) {
 125                 NTSTATUS status = cli_decrypt_message(cli);
 126                 if (!NT_STATUS_IS_OK(status)) {
 127                         DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
 128                                 nt_errstr(status)));
 129                         cli->smb_rw_error = SMB_READ_BAD_DECRYPT;
 130                         return -1;
 131                 }
 132         }
 133
 134         show_msg(cli->inbuf);
 135         return len;
 136 }
 137
 138 static bool cli_state_set_seqnum(struct cli_state *cli, uint16_t mid, uint32_t seqnum)
 139 {
 140         struct cli_state_seqnum *c;
 141
 142         for (c = cli->seqnum; c; c = c->next) {
 143                 if (c->mid == mid) {
 144                         c->seqnum = seqnum;
 145                         return true;
 146                 }
 147         }
 148
 149         c = talloc_zero(cli, struct cli_state_seqnum);
 150         if (!c) {
 151                 return false;
 152         }
 153
 154         c->mid = mid;
 155         c->seqnum = seqnum;
 156         c->persistent = false;
 157         DLIST_ADD_END(cli->seqnum, c, struct cli_state_seqnum *);
 158
 159         return true;
 160 }
 161
 162 bool cli_state_seqnum_persistent(struct cli_state *cli,
 163                                  uint16_t mid)
 164 {
 165         struct cli_state_seqnum *c;
 166
 167         for (c = cli->seqnum; c; c = c->next) {
 168                 if (c->mid == mid) {
 169                         c->persistent = true;
 170                         return true;
 171                 }
 172         }
 173
 174         return false;
 175 }
 176
 177 bool cli_state_seqnum_remove(struct cli_state *cli,
 178                              uint16_t mid)
 179 {
 180         struct cli_state_seqnum *c;
 181
 182         for (c = cli->seqnum; c; c = c->next) {
 183                 if (c->mid == mid) {
 184                         DLIST_REMOVE(cli->seqnum, c);
 185                         TALLOC_FREE(c);
 186                         return true;
 187                 }
 188         }
 189
 190         return false;
 191 }
 192
 193 static uint32_t cli_state_get_seqnum(struct cli_state *cli, uint16_t mid)
 194 {
 195         struct cli_state_seqnum *c;
 196
 197         for (c = cli->seqnum; c; c = c->next) {
 198                 if (c->mid == mid) {
 199                         uint32_t seqnum = c->seqnum;
 200                         if (!c->persistent) {
 201                                 DLIST_REMOVE(cli->seqnum, c);
 202                                 TALLOC_FREE(c);
 203                         }
 204                         return seqnum;
 205                 }
 206         }
 207
 208         return 0;
 209 }
 210
 211 /****************************************************************************
 212  Recv an smb.
 213 ****************************************************************************/
 214
 215 bool cli_receive_smb(struct cli_state *cli)
 216 {
 217         ssize_t len;
 218         uint16_t mid;
 219         uint32_t seqnum;
 220
 221         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 222         if (cli->fd == -1)
 223                 return false;
 224
 225  again:
 226         len = client_receive_smb(cli, 0);
 227
 228         if (len > 0) {
 229                 /* it might be an oplock break request */
 230                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
 231                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
 232                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
 233                     SVAL(cli->inbuf,smb_vwv7) == 0) {
 234                         if (cli->oplock_handler) {
 235                                 int fnum = SVAL(cli->inbuf,smb_vwv2);
 236                                 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
 237                                 if (!NT_STATUS_IS_OK(cli->oplock_handler(cli, fnum, level))) {
 238                                         return false;
 239                                 }
 240                         }
 241                         /* try to prevent loops */
 242                         SCVAL(cli->inbuf,smb_com,0xFF);
 243                         goto again;
 244                 }
 245         }
 246
 247         /* If the server is not responding, note that now */
 248         if (len < 0) {
 249                 DEBUG(0, ("Receiving SMB: Server stopped responding\n"));
 250                 close(cli->fd);
 251                 cli->fd = -1;
 252                 return false;
 253         }
 254
 255         mid = SVAL(cli->inbuf,smb_mid);
 256         seqnum = cli_state_get_seqnum(cli, mid);
 257
 258         if (!cli_check_sign_mac(cli, cli->inbuf, seqnum+1)) {
 259                 /*
 260                  * If we get a signature failure in sessionsetup, then
 261                  * the server sometimes just reflects the sent signature
 262                  * back to us. Detect this and allow the upper layer to
 263                  * retrieve the correct Windows error message.
 264                  */
 265                 if (CVAL(cli->outbuf,smb_com) == SMBsesssetupX &&
 266                         (smb_len(cli->inbuf) > (smb_ss_field + 8 - 4)) &&
 267                         (SVAL(cli->inbuf,smb_flg2) & FLAGS2_SMB_SECURITY_SIGNATURES) &&
 268                         memcmp(&cli->outbuf[smb_ss_field],&cli->inbuf[smb_ss_field],8) == 0 &&
 269                         cli_is_error(cli)) {
 270
 271                         /*
 272                          * Reflected signature on login error.
 273                          * Set bad sig but don't close fd.
 274                          */
 275                         cli->smb_rw_error = SMB_READ_BAD_SIG;
 276                         return true;
 277                 }
 278
 279                 DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
 280                 cli->smb_rw_error = SMB_READ_BAD_SIG;
 281                 close(cli->fd);
 282                 cli->fd = -1;
 283                 return false;
 284         };
 285         return true;
 286 }
 287
 288 static ssize_t write_socket(int fd, const char *buf, size_t len)
 289 {
 290         ssize_t ret=0;
 291
 292         DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
 293         ret = write_data(fd,buf,len);
 294
 295         DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
 296         if(ret <= 0)
 297                 DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
 298                         (int)len, fd, strerror(errno) ));
 299
 300         return(ret);
 301 }
 302
 303 /****************************************************************************
 304  Send an smb to a fd.
 305 ****************************************************************************/
 306
 307 bool cli_send_smb(struct cli_state *cli)
 308 {
 309         size_t len;
 310         size_t nwritten=0;
 311         ssize_t ret;
 312         char *buf_out = cli->outbuf;
 313         bool enc_on = cli_encryption_on(cli);
 314         uint32_t seqnum;
 315
 316         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 317         if (cli->fd == -1)
 318                 return false;
 319
 320         cli_calculate_sign_mac(cli, cli->outbuf, &seqnum);
 321
 322         if (!cli_state_set_seqnum(cli, cli->mid, seqnum)) {
 323                 DEBUG(0,("Failed to store mid[%u]/seqnum[%u]\n",
 324                         (unsigned int)cli->mid,
 325                         (unsigned int)seqnum));
 326                 return false;
 327         }
 328
 329         if (enc_on) {
 330                 NTSTATUS status = cli_encrypt_message(cli, cli->outbuf,
 331                                                       &buf_out);
 332                 if (!NT_STATUS_IS_OK(status)) {
 333                         close(cli->fd);
 334                         cli->fd = -1;
 335                         cli->smb_rw_error = SMB_WRITE_ERROR;
 336                         DEBUG(0,("Error in encrypting client message. Error %s\n",
 337                                 nt_errstr(status) ));
 338                         return false;
 339                 }
 340         }
 341
 342         len = smb_len(buf_out) + 4;
 343
 344         while (nwritten < len) {
 345                 ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
 346                 if (ret <= 0) {
 347                         if (enc_on) {
 348                                 cli_free_enc_buffer(cli, buf_out);
 349                         }
 350                         close(cli->fd);
 351                         cli->fd = -1;
 352                         cli->smb_rw_error = SMB_WRITE_ERROR;
 353                         DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
 354                                 (int)len,(int)ret, strerror(errno) ));
 355                         return false;
 356                 }
 357                 nwritten += ret;
 358         }
 359
 360         if (enc_on) {
 361                 cli_free_enc_buffer(cli, buf_out);
 362         }
 363
 364         /* Increment the mid so we can tell between responses. */
 365         cli->mid++;
 366         if (!cli->mid)
 367                 cli->mid++;
 368         return true;
 369 }
 370
 371 /****************************************************************************
 372  Send a "direct" writeX smb to a fd.
 373 ****************************************************************************/
 374
 375 bool cli_send_smb_direct_writeX(struct cli_state *cli,
 376                                 const char *p,
 377                                 size_t extradata)
 378 {
 379         /* First length to send is the offset to the data. */
 380         size_t len = SVAL(cli->outbuf,smb_vwv11) + 4;
 381         size_t nwritten=0;
 382         struct iovec iov[2];
 383
 384         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 385         if (cli->fd == -1) {
 386                 return false;
 387         }
 388
 389         if (client_is_signing_on(cli)) {
 390                 DEBUG(0,("cli_send_smb_large: cannot send signed packet.\n"));
 391                 return false;
 392         }
 393
 394         iov[0].iov_base = (void *)cli->outbuf;
 395         iov[0].iov_len = len;
 396         iov[1].iov_base = CONST_DISCARD(void *, p);
 397         iov[1].iov_len = extradata;
 398
 399         nwritten = write_data_iov(cli->fd, iov, 2);
 400         if (nwritten < (len + extradata)) {
 401                 close(cli->fd);
 402                 cli->fd = -1;
 403                 cli->smb_rw_error = SMB_WRITE_ERROR;
 404                 DEBUG(0,("Error writing %d bytes to client. (%s)\n",
 405                          (int)(len+extradata), strerror(errno)));
 406                 return false;
 407         }
 408
 409         /* Increment the mid so we can tell between responses. */
 410         cli->mid++;
 411         if (!cli->mid)
 412                 cli->mid++;
 413         return true;
 414 }
 415
 416 /****************************************************************************
 417  Setup basics in a outgoing packet.
 418 ****************************************************************************/
 419
 420 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
 421 {
 422         uint16 flags2;
 423         cli->rap_error = 0;
 424         SIVAL(buf,smb_rcls,0);
 425         SSVAL(buf,smb_pid,cli->pid);
 426         memset(buf+smb_pidhigh, 0, 12);
 427         SSVAL(buf,smb_uid,cli->vuid);
 428         SSVAL(buf,smb_mid,cli->mid);
 429
 430         if (cli->protocol <= PROTOCOL_CORE) {
 431                 return;
 432         }
 433
 434         if (cli->case_sensitive) {
 435                 SCVAL(buf,smb_flg,0x0);
 436         } else {
 437                 /* Default setting, case insensitive. */
 438                 SCVAL(buf,smb_flg,0x8);
 439         }
 440         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 441         if (cli->capabilities & CAP_UNICODE)
 442                 flags2 |= FLAGS2_UNICODE_STRINGS;
 443         if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
 444                 flags2 |= FLAGS2_DFS_PATHNAMES;
 445         if (cli->capabilities & CAP_STATUS32)
 446                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 447         if (cli->use_spnego)
 448                 flags2 |= FLAGS2_EXTENDED_SECURITY;
 449         SSVAL(buf,smb_flg2, flags2);
 450 }
 451
 452 void cli_setup_packet(struct cli_state *cli)
 453 {
 454         cli_setup_packet_buf(cli, cli->outbuf);
 455 }
 456
 457 /****************************************************************************
 458  Setup the bcc length of the packet from a pointer to the end of the data.
 459 ****************************************************************************/
 460
 461 void cli_setup_bcc(struct cli_state *cli, void *p)
 462 {
 463         set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 464 }
 465
 466 /****************************************************************************
 467  Initialize Domain, user or password.
 468 ****************************************************************************/
 469
 470 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
 471 {
 472         TALLOC_FREE(cli->domain);
 473         cli->domain = talloc_strdup(cli, domain ? domain : "");
 474         if (cli->domain == NULL) {
 475                 return NT_STATUS_NO_MEMORY;
 476         }
 477         return NT_STATUS_OK;
 478 }
 479
 480 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
 481 {
 482         TALLOC_FREE(cli->user_name);
 483         cli->user_name = talloc_strdup(cli, username ? username : "");
 484         if (cli->user_name == NULL) {
 485                 return NT_STATUS_NO_MEMORY;
 486         }
 487         return NT_STATUS_OK;
 488 }
 489
 490 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
 491 {
 492         TALLOC_FREE(cli->password);
 493
 494         /* Password can be NULL. */
 495         if (password) {
 496                 cli->password = talloc_strdup(cli, password);
 497                 if (cli->password == NULL) {
 498                         return NT_STATUS_NO_MEMORY;
 499                 }
 500         } else {
 501                 /* Use zero NTLMSSP hashes and session key. */
 502                 cli->password = NULL;
 503         }
 504
 505         return NT_STATUS_OK;
 506 }
 507
 508 /****************************************************************************
 509  Initialise credentials of a client structure.
 510 ****************************************************************************/
 511
 512 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 513 {
 514         NTSTATUS status = cli_set_username(cli, username);
 515         if (!NT_STATUS_IS_OK(status)) {
 516                 return status;
 517         }
 518         status = cli_set_domain(cli, domain);
 519         if (!NT_STATUS_IS_OK(status)) {
 520                 return status;
 521         }
 522         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 523
 524         return cli_set_password(cli, password);
 525 }
 526
 527 /****************************************************************************
 528  Initialise a client structure. Always returns a talloc'ed struct.
 529  Set the signing state (used from the command line).
 530 ****************************************************************************/
 531
 532 struct cli_state *cli_initialise_ex(int signing_state)
 533 {
 534         struct cli_state *cli = NULL;
 535         bool allow_smb_signing = false;
 536         bool mandatory_signing = false;
 537
 538         /* Check the effective uid - make sure we are not setuid */
 539         if (is_setuid_root()) {
 540                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 541                 return NULL;
 542         }
 543
 544         cli = TALLOC_ZERO_P(NULL, struct cli_state);
 545         if (!cli) {
 546                 return NULL;
 547         }
 548
 549         cli->dfs_mountpoint = talloc_strdup(cli, "");
 550         if (!cli->dfs_mountpoint) {
 551                 goto error;
 552         }
 553         cli->port = 0;
 554         cli->fd = -1;
 555         cli->cnum = -1;
 556         cli->pid = (uint16)sys_getpid();
 557         cli->mid = 1;
 558         cli->vuid = UID_FIELD_INVALID;
 559         cli->protocol = PROTOCOL_NT1;
 560         cli->timeout = 20000; /* Timeout is in milliseconds. */
 561         cli->bufsize = CLI_BUFFER_SIZE+4;
 562         cli->max_xmit = cli->bufsize;
 563         cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 564         cli->seqnum = 0;
 565         cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 566         cli->oplock_handler = cli_oplock_ack;
 567         cli->case_sensitive = false;
 568         cli->smb_rw_error = SMB_READ_OK;
 569
 570         cli->use_spnego = lp_client_use_spnego();
 571
 572         cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
 573
 574         /* Set the CLI_FORCE_DOSERR environment variable to test
 575            client routines using DOS errors instead of STATUS32
 576            ones.  This intended only as a temporary hack. */
 577         if (getenv("CLI_FORCE_DOSERR"))
 578                 cli->force_dos_errors = true;
 579
 580         if (lp_client_signing()) {
 581                 allow_smb_signing = true;
 582         }
 583
 584         if (lp_client_signing() == Required) {
 585                 mandatory_signing = true;
 586         }
 587
 588         if (signing_state != Undefined) {
 589                 allow_smb_signing = true;
 590         }
 591
 592         if (signing_state == false) {
 593                 allow_smb_signing = false;
 594                 mandatory_signing = false;
 595         }
 596
 597         if (signing_state == Required) {
 598                 mandatory_signing = true;
 599         }
 600
 601         if (!cli->outbuf || !cli->inbuf)
 602                 goto error;
 603
 604         memset(cli->outbuf, 0, cli->bufsize);
 605         memset(cli->inbuf, 0, cli->bufsize);
 606
 607
 608 #if defined(DEVELOPER)
 609         /* just because we over-allocate, doesn't mean it's right to use it */
 610         clobber_region(FUNCTION_MACRO, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
 611         clobber_region(FUNCTION_MACRO, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
 612 #endif
 613
 614         /* initialise signing */
 615         cli->signing_state = smb_signing_init(cli,
 616                                               allow_smb_signing,
 617                                               mandatory_signing);
 618         if (!cli->signing_state) {
 619                 goto error;
 620         }
 621
 622         cli->outgoing = tevent_queue_create(cli, "cli_outgoing");
 623         if (cli->outgoing == NULL) {
 624                 goto error;
 625         }
 626         cli->pending = NULL;
 627
 628         cli->initialised = 1;
 629
 630         return cli;
 631
 632         /* Clean up after malloc() error */
 633
 634  error:
 635
 636         SAFE_FREE(cli->inbuf);
 637         SAFE_FREE(cli->outbuf);
 638         TALLOC_FREE(cli);
 639         return NULL;
 640 }
 641
 642 struct cli_state *cli_initialise(void)
 643 {
 644         return cli_initialise_ex(Undefined);
 645 }
 646
 647 /****************************************************************************
 648  Close all pipes open on this session.
 649 ****************************************************************************/
 650
 651 void cli_nt_pipes_close(struct cli_state *cli)
 652 {
 653         while (cli->pipe_list != NULL) {
 654                 /*
 655                  * No TALLOC_FREE here!
 656                  */
 657                 talloc_free(cli->pipe_list);
 658         }
 659 }
 660
 661 /****************************************************************************
 662  Shutdown a client structure.
 663 ****************************************************************************/
 664
 665 static void _cli_shutdown(struct cli_state *cli)
 666 {
 667         cli_nt_pipes_close(cli);
 668
 669         /*
 670          * tell our peer to free his resources.  Wihtout this, when an
 671          * application attempts to do a graceful shutdown and calls
 672          * smbc_free_context() to clean up all connections, some connections
 673          * can remain active on the peer end, until some (long) timeout period
 674          * later.  This tree disconnect forces the peer to clean up, since the
 675          * connection will be going away.
 676          *
 677          * Also, do not do tree disconnect when cli->smb_rw_error is SMB_DO_NOT_DO_TDIS
 678          * the only user for this so far is smbmount which passes opened connection
 679          * down to kernel's smbfs module.
 680          */
 681         if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != SMB_DO_NOT_DO_TDIS ) ) {
 682                 cli_tdis(cli);
 683         }
 684
 685         SAFE_FREE(cli->outbuf);
 686         SAFE_FREE(cli->inbuf);
 687
 688         data_blob_free(&cli->secblob);
 689         data_blob_free(&cli->user_session_key);
 690
 691         if (cli->fd != -1) {
 692                 close(cli->fd);
 693         }
 694         cli->fd = -1;
 695         cli->smb_rw_error = SMB_READ_OK;
 696
 697         /*
 698          * Need to free pending first, they remove themselves
 699          */
 700         while (cli->pending) {
 701                 talloc_free(cli->pending[0]);
 702         }
 703         TALLOC_FREE(cli);
 704 }
 705
 706 void cli_shutdown(struct cli_state *cli)
 707 {
 708         struct cli_state *cli_head;
 709         if (cli == NULL) {
 710                 return;
 711         }
 712         DLIST_HEAD(cli, cli_head);
 713         if (cli_head == cli) {
 714                 /*
 715                  * head of a DFS list, shutdown all subsidiary DFS
 716                  * connections.
 717                  */
 718                 struct cli_state *p, *next;
 719
 720                 for (p = cli_head->next; p; p = next) {
 721                         next = p->next;
 722                         DLIST_REMOVE(cli_head, p);
 723                         _cli_shutdown(p);
 724                 }
 725         } else {
 726                 DLIST_REMOVE(cli_head, cli);
 727         }
 728
 729         _cli_shutdown(cli);
 730 }
 731
 732 /****************************************************************************
 733  Set socket options on a open connection.
 734 ****************************************************************************/
 735
 736 void cli_sockopt(struct cli_state *cli, const char *options)
 737 {
 738         set_socket_options(cli->fd, options);
 739 }
 740
 741 /****************************************************************************
 742  Set the PID to use for smb messages. Return the old pid.
 743 ****************************************************************************/
 744
 745 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 746 {
 747         uint16 ret = cli->pid;
 748         cli->pid = pid;
 749         return ret;
 750 }
 751
 752 /****************************************************************************
 753  Set the case sensitivity flag on the packets. Returns old state.
 754 ****************************************************************************/
 755
 756 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 757 {
 758         bool ret = cli->case_sensitive;
 759         cli->case_sensitive = case_sensitive;
 760         return ret;
 761 }
 762
 763 /****************************************************************************
 764 Send a keepalive packet to the server
 765 ****************************************************************************/
 766
 767 bool cli_send_keepalive(struct cli_state *cli)
 768 {
 769         if (cli->fd == -1) {
 770                 DEBUG(3, ("cli_send_keepalive: fd == -1\n"));
 771                 return false;
 772         }
 773         if (!send_keepalive(cli->fd)) {
 774                 close(cli->fd);
 775                 cli->fd = -1;
 776                 DEBUG(0,("Error sending keepalive packet to client.\n"));
 777                 return false;
 778         }
 779         return true;
 780 }
 781
 782 struct cli_echo_state {
 783         uint16_t vwv[1];
 784         DATA_BLOB data;
 785         int num_echos;
 786 };
 787
 788 static void cli_echo_done(struct tevent_req *subreq);
 789
 790 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 791                                  struct cli_state *cli, uint16_t num_echos,
 792                                  DATA_BLOB data)
 793 {
 794         struct tevent_req *req, *subreq;
 795         struct cli_echo_state *state;
 796
 797         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 798         if (req == NULL) {
 799                 return NULL;
 800         }
 801         SSVAL(state->vwv, 0, num_echos);
 802         state->data = data;
 803         state->num_echos = num_echos;
 804
 805         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 806                               data.length, data.data);
 807         if (subreq == NULL) {
 808                 goto fail;
 809         }
 810         tevent_req_set_callback(subreq, cli_echo_done, req);
 811         return req;
 812  fail:
 813         TALLOC_FREE(req);
 814         return NULL;
 815 }
 816
 817 static void cli_echo_done(struct tevent_req *subreq)
 818 {
 819         struct tevent_req *req = tevent_req_callback_data(
 820                 subreq, struct tevent_req);
 821         struct cli_echo_state *state = tevent_req_data(
 822                 req, struct cli_echo_state);
 823         NTSTATUS status;
 824         uint32_t num_bytes;
 825         uint8_t *bytes;
 826         uint8_t *inbuf;
 827
 828         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 829                               &num_bytes, &bytes);
 830         if (!NT_STATUS_IS_OK(status)) {
 831                 tevent_req_nterror(req, status);
 832                 return;
 833         }
 834         if ((num_bytes != state->data.length)
 835             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 836                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 837                 return;
 838         }
 839
 840         state->num_echos -=1;
 841         if (state->num_echos == 0) {
 842                 tevent_req_done(req);
 843                 return;
 844         }
 845
 846         if (!cli_smb_req_set_pending(subreq)) {
 847                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 848                 return;
 849         }
 850 }
 851
 852 /**
 853  * Get the result out from an echo request
 854  * @param[in] req       The async_req from cli_echo_send
 855  * @retval Did the server reply correctly?
 856  */
 857
 858 NTSTATUS cli_echo_recv(struct tevent_req *req)
 859 {
 860         return tevent_req_simple_recv_ntstatus(req);
 861 }
 862
 863 /**
 864  * @brief Send/Receive SMBEcho requests
 865  * @param[in] mem_ctx   The memory context to put the async_req on
 866  * @param[in] ev        The event context that will call us back
 867  * @param[in] cli       The connection to send the echo to
 868  * @param[in] num_echos How many times do we want to get the reply?
 869  * @param[in] data      The data we want to get back
 870  * @retval Did the server reply correctly?
 871  */
 872
 873 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 874 {
 875         TALLOC_CTX *frame = talloc_stackframe();
 876         struct event_context *ev;
 877         struct tevent_req *req;
 878         NTSTATUS status = NT_STATUS_OK;
 879
 880         if (cli_has_async_calls(cli)) {
 881                 /*
 882                  * Can't use sync call while an async call is in flight
 883                  */
 884                 status = NT_STATUS_INVALID_PARAMETER;
 885                 goto fail;
 886         }
 887
 888         ev = event_context_init(frame);
 889         if (ev == NULL) {
 890                 status = NT_STATUS_NO_MEMORY;
 891                 goto fail;
 892         }
 893
 894         req = cli_echo_send(frame, ev, cli, num_echos, data);
 895         if (req == NULL) {
 896                 status = NT_STATUS_NO_MEMORY;
 897                 goto fail;
 898         }
 899
 900         if (!tevent_req_poll(req, ev)) {
 901                 status = map_nt_error_from_unix(errno);
 902                 goto fail;
 903         }
 904
 905         status = cli_echo_recv(req);
 906  fail:
 907         TALLOC_FREE(frame);
 908         if (!NT_STATUS_IS_OK(status)) {
 909                 cli_set_error(cli, status);
 910         }
 911         return status;
 912 }
 913
 914 /**
 915  * Is the SMB command able to hold an AND_X successor
 916  * @param[in] cmd       The SMB command in question
 917  * @retval Can we add a chained request after "cmd"?
 918  */
 919 bool is_andx_req(uint8_t cmd)
 920 {
 921         switch (cmd) {
 922         case SMBtconX:
 923         case SMBlockingX:
 924         case SMBopenX:
 925         case SMBreadX:
 926         case SMBwriteX:
 927         case SMBsesssetupX:
 928         case SMBulogoffX:
 929         case SMBntcreateX:
 930                 return true;
 931                 break;
 932         default:
 933                 break;
 934         }
 935
 936         return false;
 937 }
 938
 939 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 940                  uint8_t smb_command, uint8_t additional_flags,
 941                  uint8_t wct, uint16_t *vwv,
 942                  uint32_t num_bytes, const uint8_t *bytes,
 943                  struct tevent_req **result_parent,
 944                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 945                  uint32_t *pnum_bytes, uint8_t **pbytes)
 946 {
 947         struct tevent_context *ev;
 948         struct tevent_req *req = NULL;
 949         NTSTATUS status = NT_STATUS_NO_MEMORY;
 950
 951         if (cli_has_async_calls(cli)) {
 952                 return NT_STATUS_INVALID_PARAMETER;
 953         }
 954         ev = tevent_context_init(mem_ctx);
 955         if (ev == NULL) {
 956                 goto fail;
 957         }
 958         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 959                            wct, vwv, num_bytes, bytes);
 960         if (req == NULL) {
 961                 goto fail;
 962         }
 963         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 964                 goto fail;
 965         }
 966         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 967                               pnum_bytes, pbytes);
 968 fail:
 969         TALLOC_FREE(ev);
 970         if (NT_STATUS_IS_OK(status)) {
 971                 *result_parent = req;
 972         }
 973         return status;
 974 }