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 (!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 /****************************************************************************
 289  Read the data portion of a readX smb.
 290  The timeout is in milliseconds
 291 ****************************************************************************/
 292
 293 ssize_t cli_receive_smb_data(struct cli_state *cli, char *buffer, size_t len)
 294 {
 295         NTSTATUS status;
 296
 297         set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);
 298
 299         status = read_socket_with_timeout(
 300                 cli->fd, buffer, len, len, cli->timeout, NULL);
 301         if (NT_STATUS_IS_OK(status)) {
 302                 return len;
 303         }
 304
 305         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
 306                 set_smb_read_error(&cli->smb_rw_error, SMB_READ_EOF);
 307                 return -1;
 308         }
 309
 310         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 311                 set_smb_read_error(&cli->smb_rw_error, SMB_READ_TIMEOUT);
 312                 return -1;
 313         }
 314
 315         set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
 316         return -1;
 317 }
 318
 319 static ssize_t write_socket(int fd, const char *buf, size_t len)
 320 {
 321         ssize_t ret=0;
 322
 323         DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
 324         ret = write_data(fd,buf,len);
 325
 326         DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
 327         if(ret <= 0)
 328                 DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
 329                         (int)len, fd, strerror(errno) ));
 330
 331         return(ret);
 332 }
 333
 334 /****************************************************************************
 335  Send an smb to a fd.
 336 ****************************************************************************/
 337
 338 bool cli_send_smb(struct cli_state *cli)
 339 {
 340         size_t len;
 341         size_t nwritten=0;
 342         ssize_t ret;
 343         char *buf_out = cli->outbuf;
 344         bool enc_on = cli_encryption_on(cli);
 345         uint32_t seqnum;
 346
 347         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 348         if (cli->fd == -1)
 349                 return false;
 350
 351         cli_calculate_sign_mac(cli, cli->outbuf, &seqnum);
 352
 353         if (!cli_state_set_seqnum(cli, cli->mid, seqnum)) {
 354                 DEBUG(0,("Failed to store mid[%u]/seqnum[%u]\n",
 355                         (unsigned int)cli->mid,
 356                         (unsigned int)seqnum));
 357                 return false;
 358         }
 359
 360         if (enc_on) {
 361                 NTSTATUS status = cli_encrypt_message(cli, cli->outbuf,
 362                                                       &buf_out);
 363                 if (!NT_STATUS_IS_OK(status)) {
 364                         close(cli->fd);
 365                         cli->fd = -1;
 366                         cli->smb_rw_error = SMB_WRITE_ERROR;
 367                         DEBUG(0,("Error in encrypting client message. Error %s\n",
 368                                 nt_errstr(status) ));
 369                         return false;
 370                 }
 371         }
 372
 373         len = smb_len(buf_out) + 4;
 374
 375         while (nwritten < len) {
 376                 ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
 377                 if (ret <= 0) {
 378                         if (enc_on) {
 379                                 cli_free_enc_buffer(cli, buf_out);
 380                         }
 381                         close(cli->fd);
 382                         cli->fd = -1;
 383                         cli->smb_rw_error = SMB_WRITE_ERROR;
 384                         DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
 385                                 (int)len,(int)ret, strerror(errno) ));
 386                         return false;
 387                 }
 388                 nwritten += ret;
 389         }
 390
 391         if (enc_on) {
 392                 cli_free_enc_buffer(cli, buf_out);
 393         }
 394
 395         /* Increment the mid so we can tell between responses. */
 396         cli->mid++;
 397         if (!cli->mid)
 398                 cli->mid++;
 399         return true;
 400 }
 401
 402 /****************************************************************************
 403  Send a "direct" writeX smb to a fd.
 404 ****************************************************************************/
 405
 406 bool cli_send_smb_direct_writeX(struct cli_state *cli,
 407                                 const char *p,
 408                                 size_t extradata)
 409 {
 410         /* First length to send is the offset to the data. */
 411         size_t len = SVAL(cli->outbuf,smb_vwv11) + 4;
 412         size_t nwritten=0;
 413         struct iovec iov[2];
 414
 415         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 416         if (cli->fd == -1) {
 417                 return false;
 418         }
 419
 420         if (client_is_signing_on(cli)) {
 421                 DEBUG(0,("cli_send_smb_large: cannot send signed packet.\n"));
 422                 return false;
 423         }
 424
 425         iov[0].iov_base = cli->outbuf;
 426         iov[0].iov_len = len;
 427         iov[1].iov_base = CONST_DISCARD(char *, p);
 428         iov[1].iov_len = extradata;
 429
 430         nwritten = write_data_iov(cli->fd, iov, 2);
 431         if (nwritten < (len + extradata)) {
 432                 close(cli->fd);
 433                 cli->fd = -1;
 434                 cli->smb_rw_error = SMB_WRITE_ERROR;
 435                 DEBUG(0,("Error writing %d bytes to client. (%s)\n",
 436                          (int)(len+extradata), strerror(errno)));
 437                 return false;
 438         }
 439
 440         /* Increment the mid so we can tell between responses. */
 441         cli->mid++;
 442         if (!cli->mid)
 443                 cli->mid++;
 444         return true;
 445 }
 446
 447 /****************************************************************************
 448  Setup basics in a outgoing packet.
 449 ****************************************************************************/
 450
 451 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
 452 {
 453         uint16 flags2;
 454         cli->rap_error = 0;
 455         SIVAL(buf,smb_rcls,0);
 456         SSVAL(buf,smb_pid,cli->pid);
 457         memset(buf+smb_pidhigh, 0, 12);
 458         SSVAL(buf,smb_uid,cli->vuid);
 459         SSVAL(buf,smb_mid,cli->mid);
 460
 461         if (cli->protocol <= PROTOCOL_CORE) {
 462                 return;
 463         }
 464
 465         if (cli->case_sensitive) {
 466                 SCVAL(buf,smb_flg,0x0);
 467         } else {
 468                 /* Default setting, case insensitive. */
 469                 SCVAL(buf,smb_flg,0x8);
 470         }
 471         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 472         if (cli->capabilities & CAP_UNICODE)
 473                 flags2 |= FLAGS2_UNICODE_STRINGS;
 474         if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
 475                 flags2 |= FLAGS2_DFS_PATHNAMES;
 476         if (cli->capabilities & CAP_STATUS32)
 477                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 478         if (cli->use_spnego)
 479                 flags2 |= FLAGS2_EXTENDED_SECURITY;
 480         SSVAL(buf,smb_flg2, flags2);
 481 }
 482
 483 void cli_setup_packet(struct cli_state *cli)
 484 {
 485         cli_setup_packet_buf(cli, cli->outbuf);
 486 }
 487
 488 /****************************************************************************
 489  Setup the bcc length of the packet from a pointer to the end of the data.
 490 ****************************************************************************/
 491
 492 void cli_setup_bcc(struct cli_state *cli, void *p)
 493 {
 494         set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 495 }
 496
 497 /****************************************************************************
 498  Initialize Domain, user or password.
 499 ****************************************************************************/
 500
 501 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
 502 {
 503         TALLOC_FREE(cli->domain);
 504         cli->domain = talloc_strdup(cli, domain ? domain : "");
 505         if (cli->domain == NULL) {
 506                 return NT_STATUS_NO_MEMORY;
 507         }
 508         return NT_STATUS_OK;
 509 }
 510
 511 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
 512 {
 513         TALLOC_FREE(cli->user_name);
 514         cli->user_name = talloc_strdup(cli, username ? username : "");
 515         if (cli->user_name == NULL) {
 516                 return NT_STATUS_NO_MEMORY;
 517         }
 518         return NT_STATUS_OK;
 519 }
 520
 521 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
 522 {
 523         TALLOC_FREE(cli->password);
 524
 525         /* Password can be NULL. */
 526         if (password) {
 527                 cli->password = talloc_strdup(cli, password);
 528                 if (cli->password == NULL) {
 529                         return NT_STATUS_NO_MEMORY;
 530                 }
 531         } else {
 532                 /* Use zero NTLMSSP hashes and session key. */
 533                 cli->password = NULL;
 534         }
 535
 536         return NT_STATUS_OK;
 537 }
 538
 539 /****************************************************************************
 540  Initialise credentials of a client structure.
 541 ****************************************************************************/
 542
 543 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 544 {
 545         NTSTATUS status = cli_set_username(cli, username);
 546         if (!NT_STATUS_IS_OK(status)) {
 547                 return status;
 548         }
 549         status = cli_set_domain(cli, domain);
 550         if (!NT_STATUS_IS_OK(status)) {
 551                 return status;
 552         }
 553         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 554
 555         return cli_set_password(cli, password);
 556 }
 557
 558 /****************************************************************************
 559  Initialise a client structure. Always returns a talloc'ed struct.
 560  Set the signing state (used from the command line).
 561 ****************************************************************************/
 562
 563 struct cli_state *cli_initialise_ex(int signing_state)
 564 {
 565         struct cli_state *cli = NULL;
 566         bool allow_smb_signing = false;
 567         bool mandatory_signing = false;
 568
 569         /* Check the effective uid - make sure we are not setuid */
 570         if (is_setuid_root()) {
 571                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 572                 return NULL;
 573         }
 574
 575         cli = TALLOC_ZERO_P(NULL, struct cli_state);
 576         if (!cli) {
 577                 return NULL;
 578         }
 579
 580         cli->dfs_mountpoint = talloc_strdup(cli, "");
 581         if (!cli->dfs_mountpoint) {
 582                 goto error;
 583         }
 584         cli->port = 0;
 585         cli->fd = -1;
 586         cli->cnum = -1;
 587         cli->pid = (uint16)sys_getpid();
 588         cli->mid = 1;
 589         cli->vuid = UID_FIELD_INVALID;
 590         cli->protocol = PROTOCOL_NT1;
 591         cli->timeout = 20000; /* Timeout is in milliseconds. */
 592         cli->bufsize = CLI_BUFFER_SIZE+4;
 593         cli->max_xmit = cli->bufsize;
 594         cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 595         cli->seqnum = 0;
 596         cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 597         cli->oplock_handler = cli_oplock_ack;
 598         cli->case_sensitive = false;
 599         cli->smb_rw_error = SMB_READ_OK;
 600
 601         cli->use_spnego = lp_client_use_spnego();
 602
 603         cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
 604
 605         /* Set the CLI_FORCE_DOSERR environment variable to test
 606            client routines using DOS errors instead of STATUS32
 607            ones.  This intended only as a temporary hack. */
 608         if (getenv("CLI_FORCE_DOSERR"))
 609                 cli->force_dos_errors = true;
 610
 611         if (lp_client_signing()) {
 612                 allow_smb_signing = true;
 613         }
 614
 615         if (lp_client_signing() == Required) {
 616                 mandatory_signing = true;
 617         }
 618
 619         if (signing_state != Undefined) {
 620                 allow_smb_signing = true;
 621         }
 622
 623         if (signing_state == false) {
 624                 allow_smb_signing = false;
 625                 mandatory_signing = false;
 626         }
 627
 628         if (signing_state == Required) {
 629                 mandatory_signing = true;
 630         }
 631
 632         if (!cli->outbuf || !cli->inbuf)
 633                 goto error;
 634
 635         memset(cli->outbuf, 0, cli->bufsize);
 636         memset(cli->inbuf, 0, cli->bufsize);
 637
 638
 639 #if defined(DEVELOPER)
 640         /* just because we over-allocate, doesn't mean it's right to use it */
 641         clobber_region(FUNCTION_MACRO, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
 642         clobber_region(FUNCTION_MACRO, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
 643 #endif
 644
 645         /* initialise signing */
 646         cli->signing_state = smb_signing_init(cli,
 647                                               allow_smb_signing,
 648                                               mandatory_signing);
 649         if (!cli->signing_state) {
 650                 goto error;
 651         }
 652
 653         cli->initialised = 1;
 654
 655         return cli;
 656
 657         /* Clean up after malloc() error */
 658
 659  error:
 660
 661         SAFE_FREE(cli->inbuf);
 662         SAFE_FREE(cli->outbuf);
 663         TALLOC_FREE(cli);
 664         return NULL;
 665 }
 666
 667 struct cli_state *cli_initialise(void)
 668 {
 669         return cli_initialise_ex(Undefined);
 670 }
 671
 672 /****************************************************************************
 673  Close all pipes open on this session.
 674 ****************************************************************************/
 675
 676 void cli_nt_pipes_close(struct cli_state *cli)
 677 {
 678         while (cli->pipe_list != NULL) {
 679                 /*
 680                  * No TALLOC_FREE here!
 681                  */
 682                 talloc_free(cli->pipe_list);
 683         }
 684 }
 685
 686 /****************************************************************************
 687  Shutdown a client structure.
 688 ****************************************************************************/
 689
 690 void cli_shutdown(struct cli_state *cli)
 691 {
 692         if (cli->prev == NULL) {
 693                 /*
 694                  * Possible head of a DFS list,
 695                  * shutdown all subsidiary DFS
 696                  * connections.
 697                  */
 698                 struct cli_state *p, *next;
 699
 700                 for (p = cli->next; p; p = next) {
 701                         next = p->next;
 702                         cli_shutdown(p);
 703                 }
 704         } else {
 705                 /*
 706                  * We're a subsidiary connection.
 707                  * Just remove ourselves from the
 708                  * DFS list.
 709                  */
 710                 DLIST_REMOVE(cli->prev, cli);
 711         }
 712
 713         cli_nt_pipes_close(cli);
 714
 715         /*
 716          * tell our peer to free his resources.  Wihtout this, when an
 717          * application attempts to do a graceful shutdown and calls
 718          * smbc_free_context() to clean up all connections, some connections
 719          * can remain active on the peer end, until some (long) timeout period
 720          * later.  This tree disconnect forces the peer to clean up, since the
 721          * connection will be going away.
 722          *
 723          * Also, do not do tree disconnect when cli->smb_rw_error is SMB_DO_NOT_DO_TDIS
 724          * the only user for this so far is smbmount which passes opened connection
 725          * down to kernel's smbfs module.
 726          */
 727         if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != SMB_DO_NOT_DO_TDIS ) ) {
 728                 cli_tdis(cli);
 729         }
 730
 731         SAFE_FREE(cli->outbuf);
 732         SAFE_FREE(cli->inbuf);
 733
 734         data_blob_free(&cli->secblob);
 735         data_blob_free(&cli->user_session_key);
 736
 737         if (cli->fd != -1) {
 738                 close(cli->fd);
 739         }
 740         cli->fd = -1;
 741         cli->smb_rw_error = SMB_READ_OK;
 742
 743         TALLOC_FREE(cli);
 744 }
 745
 746 /****************************************************************************
 747  Set socket options on a open connection.
 748 ****************************************************************************/
 749
 750 void cli_sockopt(struct cli_state *cli, const char *options)
 751 {
 752         set_socket_options(cli->fd, options);
 753 }
 754
 755 /****************************************************************************
 756  Set the PID to use for smb messages. Return the old pid.
 757 ****************************************************************************/
 758
 759 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 760 {
 761         uint16 ret = cli->pid;
 762         cli->pid = pid;
 763         return ret;
 764 }
 765
 766 /****************************************************************************
 767  Set the case sensitivity flag on the packets. Returns old state.
 768 ****************************************************************************/
 769
 770 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 771 {
 772         bool ret = cli->case_sensitive;
 773         cli->case_sensitive = case_sensitive;
 774         return ret;
 775 }
 776
 777 /****************************************************************************
 778 Send a keepalive packet to the server
 779 ****************************************************************************/
 780
 781 bool cli_send_keepalive(struct cli_state *cli)
 782 {
 783         if (cli->fd == -1) {
 784                 DEBUG(3, ("cli_send_keepalive: fd == -1\n"));
 785                 return false;
 786         }
 787         if (!send_keepalive(cli->fd)) {
 788                 close(cli->fd);
 789                 cli->fd = -1;
 790                 DEBUG(0,("Error sending keepalive packet to client.\n"));
 791                 return false;
 792         }
 793         return true;
 794 }
 795
 796 /**
 797  * @brief: Collect a echo reply
 798  * @param[in] req       The corresponding async request
 799  *
 800  * There might be more than one echo reply. This helper pulls the reply out of
 801  * the data stream. If all expected replies have arrived, declare the
 802  * async_req done.
 803  */
 804
 805 static void cli_echo_recv_helper(struct async_req *req)
 806 {
 807         struct cli_request *cli_req;
 808         uint8_t wct;
 809         uint16_t *vwv;
 810         uint16_t num_bytes;
 811         uint8_t *bytes;
 812         NTSTATUS status;
 813
 814         status = cli_pull_reply(req, &wct, &vwv, &num_bytes, &bytes);
 815         if (!NT_STATUS_IS_OK(status)) {
 816                 async_req_nterror(req, status);
 817                 return;
 818         }
 819
 820         cli_req = talloc_get_type_abort(req->private_data, struct cli_request);
 821
 822         if ((num_bytes != cli_req->data.echo.data.length)
 823             || (memcmp(cli_req->data.echo.data.data, bytes,
 824                        num_bytes) != 0)) {
 825                 async_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 826                 return;
 827         }
 828
 829         cli_req->data.echo.num_echos -= 1;
 830
 831         if (cli_req->data.echo.num_echos == 0) {
 832                 async_req_done(req);
 833                 return;
 834         }
 835
 836         return;
 837 }
 838
 839 /**
 840  * @brief Send SMBEcho requests
 841  * @param[in] mem_ctx   The memory context to put the async_req on
 842  * @param[in] ev        The event context that will call us back
 843  * @param[in] cli       The connection to send the echo to
 844  * @param[in] num_echos How many times do we want to get the reply?
 845  * @param[in] data      The data we want to get back
 846  * @retval The async request
 847  */
 848
 849 struct async_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 850                                 struct cli_state *cli, uint16_t num_echos,
 851                                 DATA_BLOB data)
 852 {
 853         uint16_t vwv[1];
 854         uint8_t *data_copy;
 855         struct async_req *result;
 856         struct cli_request *req;
 857
 858         SSVAL(vwv, 0, num_echos);
 859
 860         data_copy = (uint8_t *)talloc_memdup(mem_ctx, data.data, data.length);
 861         if (data_copy == NULL) {
 862                 return NULL;
 863         }
 864
 865         result = cli_request_send(mem_ctx, ev, cli, SMBecho, 0, 1, vwv, 0,
 866                                   data.length, data.data);
 867         if (result == NULL) {
 868                 TALLOC_FREE(data_copy);
 869                 return NULL;
 870         }
 871         req = talloc_get_type_abort(result->private_data, struct cli_request);
 872
 873         req->data.echo.num_echos = num_echos;
 874         req->data.echo.data.data = talloc_move(req, &data_copy);
 875         req->data.echo.data.length = data.length;
 876
 877         req->recv_helper.fn = cli_echo_recv_helper;
 878
 879         return result;
 880 }
 881
 882 /**
 883  * Get the result out from an echo request
 884  * @param[in] req       The async_req from cli_echo_send
 885  * @retval Did the server reply correctly?
 886  */
 887
 888 NTSTATUS cli_echo_recv(struct async_req *req)
 889 {
 890         return async_req_simple_recv_ntstatus(req);
 891 }
 892
 893 /**
 894  * @brief Send/Receive SMBEcho requests
 895  * @param[in] mem_ctx   The memory context to put the async_req on
 896  * @param[in] ev        The event context that will call us back
 897  * @param[in] cli       The connection to send the echo to
 898  * @param[in] num_echos How many times do we want to get the reply?
 899  * @param[in] data      The data we want to get back
 900  * @retval Did the server reply correctly?
 901  */
 902
 903 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 904 {
 905         TALLOC_CTX *frame = talloc_stackframe();
 906         struct event_context *ev;
 907         struct async_req *req;
 908         NTSTATUS status = NT_STATUS_NO_MEMORY;
 909
 910         if (cli->fd_event != NULL) {
 911                 /*
 912                  * Can't use sync call while an async call is in flight
 913                  */
 914                 cli_set_error(cli, NT_STATUS_INVALID_PARAMETER);
 915                 goto fail;
 916         }
 917
 918         ev = event_context_init(frame);
 919         if (ev == NULL) {
 920                 goto fail;
 921         }
 922
 923         req = cli_echo_send(frame, ev, cli, num_echos, data);
 924         if (req == NULL) {
 925                 goto fail;
 926         }
 927
 928         while (req->state < ASYNC_REQ_DONE) {
 929                 event_loop_once(ev);
 930         }
 931
 932         status = cli_echo_recv(req);
 933
 934  fail:
 935         TALLOC_FREE(frame);
 936         return status;
 937 }
 938
 939 /**
 940  * Is the SMB command able to hold an AND_X successor
 941  * @param[in] cmd       The SMB command in question
 942  * @retval Can we add a chained request after "cmd"?
 943  */
 944 bool is_andx_req(uint8_t cmd)
 945 {
 946         switch (cmd) {
 947         case SMBtconX:
 948         case SMBlockingX:
 949         case SMBopenX:
 950         case SMBreadX:
 951         case SMBwriteX:
 952         case SMBsesssetupX:
 953         case SMBulogoffX:
 954         case SMBntcreateX:
 955                 return true;
 956                 break;
 957         default:
 958                 break;
 959         }
 960
 961         return false;
 962 }