source3/libsmb/clientgen.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client generic functions
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Jeremy Allison 2007.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smb_signing.h"
  23 #include "async_smb.h"
  24
  25 /*******************************************************************
  26  Setup the word count and byte count for a client smb message.
  27 ********************************************************************/
  28
  29 int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
  30 {
  31         if (zero && (num_words || num_bytes)) {
  32                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  33         }
  34         SCVAL(buf,smb_wct,num_words);
  35         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  36         smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
  37         return (smb_size + num_words*2 + num_bytes);
  38 }
  39
  40 /****************************************************************************
  41  Change the timeout (in milliseconds).
  42 ****************************************************************************/
  43
  44 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  45 {
  46         unsigned int old_timeout = cli->timeout;
  47         cli->timeout = timeout;
  48         return old_timeout;
  49 }
  50
  51 /****************************************************************************
  52  Change the port number used to call on.
  53 ****************************************************************************/
  54
  55 void cli_set_port(struct cli_state *cli, int port)
  56 {
  57         cli->port = port;
  58 }
  59
  60 /****************************************************************************
  61  convenience routine to find if we negotiated ucs2
  62 ****************************************************************************/
  63
  64 bool cli_ucs2(struct cli_state *cli)
  65 {
  66         return ((cli->capabilities & CAP_UNICODE) != 0);
  67 }
  68
  69
  70 /****************************************************************************
  71  Read an smb from a fd ignoring all keepalive packets.
  72  The timeout is in milliseconds
  73
  74  This is exactly the same as receive_smb except that it never returns
  75  a session keepalive packet (just as receive_smb used to do).
  76  receive_smb was changed to return keepalives as the oplock processing means this call
  77  should never go into a blocking read.
  78 ****************************************************************************/
  79
  80 static ssize_t client_receive_smb(struct cli_state *cli, size_t maxlen)
  81 {
  82         size_t len;
  83
  84         for(;;) {
  85                 NTSTATUS status;
  86
  87                 set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);
  88
  89                 status = receive_smb_raw(cli->fd, cli->inbuf, cli->bufsize,
  90                                         cli->timeout, maxlen, &len);
  91                 if (!NT_STATUS_IS_OK(status)) {
  92                         DEBUG(10,("client_receive_smb failed\n"));
  93                         show_msg(cli->inbuf);
  94
  95                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
  96                                 set_smb_read_error(&cli->smb_rw_error,
  97                                                    SMB_READ_EOF);
  98                                 return -1;
  99                         }
 100
 101                         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 102                                 set_smb_read_error(&cli->smb_rw_error,
 103                                                    SMB_READ_TIMEOUT);
 104                                 return -1;
 105                         }
 106
 107                         set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
 108                         return -1;
 109                 }
 110
 111                 /*
 112                  * I don't believe len can be < 0 with NT_STATUS_OK
 113                  * returned above, but this check doesn't hurt. JRA.
 114                  */
 115
 116                 if ((ssize_t)len < 0) {
 117                         return len;
 118                 }
 119
 120                 /* Ignore session keepalive packets. */
 121                 if(CVAL(cli->inbuf,0) != SMBkeepalive) {
 122                         break;
 123                 }
 124         }
 125
 126         if (cli_encryption_on(cli)) {
 127                 NTSTATUS status = cli_decrypt_message(cli);
 128                 if (!NT_STATUS_IS_OK(status)) {
 129                         DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
 130                                 nt_errstr(status)));
 131                         cli->smb_rw_error = SMB_READ_BAD_DECRYPT;
 132                         return -1;
 133                 }
 134         }
 135
 136         show_msg(cli->inbuf);
 137         return len;
 138 }
 139
 140 static bool cli_state_set_seqnum(struct cli_state *cli, uint16_t mid, uint32_t seqnum)
 141 {
 142         struct cli_state_seqnum *c;
 143
 144         for (c = cli->seqnum; c; c = c->next) {
 145                 if (c->mid == mid) {
 146                         c->seqnum = seqnum;
 147                         return true;
 148                 }
 149         }
 150
 151         c = talloc_zero(cli, struct cli_state_seqnum);
 152         if (!c) {
 153                 return false;
 154         }
 155
 156         c->mid = mid;
 157         c->seqnum = seqnum;
 158         c->persistent = false;
 159         DLIST_ADD_END(cli->seqnum, c, struct cli_state_seqnum *);
 160
 161         return true;
 162 }
 163
 164 bool cli_state_seqnum_persistent(struct cli_state *cli,
 165                                  uint16_t mid)
 166 {
 167         struct cli_state_seqnum *c;
 168
 169         for (c = cli->seqnum; c; c = c->next) {
 170                 if (c->mid == mid) {
 171                         c->persistent = true;
 172                         return true;
 173                 }
 174         }
 175
 176         return false;
 177 }
 178
 179 bool cli_state_seqnum_remove(struct cli_state *cli,
 180                              uint16_t mid)
 181 {
 182         struct cli_state_seqnum *c;
 183
 184         for (c = cli->seqnum; c; c = c->next) {
 185                 if (c->mid == mid) {
 186                         DLIST_REMOVE(cli->seqnum, c);
 187                         TALLOC_FREE(c);
 188                         return true;
 189                 }
 190         }
 191
 192         return false;
 193 }
 194
 195 static uint32_t cli_state_get_seqnum(struct cli_state *cli, uint16_t mid)
 196 {
 197         struct cli_state_seqnum *c;
 198
 199         for (c = cli->seqnum; c; c = c->next) {
 200                 if (c->mid == mid) {
 201                         uint32_t seqnum = c->seqnum;
 202                         if (!c->persistent) {
 203                                 DLIST_REMOVE(cli->seqnum, c);
 204                                 TALLOC_FREE(c);
 205                         }
 206                         return seqnum;
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 /****************************************************************************
 214  Recv an smb.
 215 ****************************************************************************/
 216
 217 bool cli_receive_smb(struct cli_state *cli)
 218 {
 219         ssize_t len;
 220         uint16_t mid;
 221         uint32_t seqnum;
 222
 223         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 224         if (cli->fd == -1)
 225                 return false;
 226
 227  again:
 228         len = client_receive_smb(cli, 0);
 229
 230         if (len > 0) {
 231                 /* it might be an oplock break request */
 232                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
 233                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
 234                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
 235                     SVAL(cli->inbuf,smb_vwv7) == 0) {
 236                         if (cli->oplock_handler) {
 237                                 int fnum = SVAL(cli->inbuf,smb_vwv2);
 238                                 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
 239                                 if (!NT_STATUS_IS_OK(cli->oplock_handler(cli, fnum, level))) {
 240                                         return false;
 241                                 }
 242                         }
 243                         /* try to prevent loops */
 244                         SCVAL(cli->inbuf,smb_com,0xFF);
 245                         goto again;
 246                 }
 247         }
 248
 249         /* If the server is not responding, note that now */
 250         if (len < 0) {
 251                 /*
 252                  * only log if the connection should still be open and not when
 253                  * the connection was closed due to a dropped ip message
 254                  */
 255                 if (cli->fd != -1) {
 256                         char addr[INET6_ADDRSTRLEN];
 257                         print_sockaddr(addr, sizeof(addr), &cli->dest_ss);
 258                         DEBUG(0, ("Receiving SMB: Server %s stopped responding\n",
 259                                 addr));
 260                         close(cli->fd);
 261                         cli->fd = -1;
 262                 }
 263                 return false;
 264         }
 265
 266         mid = SVAL(cli->inbuf,smb_mid);
 267         seqnum = cli_state_get_seqnum(cli, mid);
 268
 269         if (!cli_check_sign_mac(cli, cli->inbuf, seqnum+1)) {
 270                 /*
 271                  * If we get a signature failure in sessionsetup, then
 272                  * the server sometimes just reflects the sent signature
 273                  * back to us. Detect this and allow the upper layer to
 274                  * retrieve the correct Windows error message.
 275                  */
 276                 if (CVAL(cli->outbuf,smb_com) == SMBsesssetupX &&
 277                         (smb_len(cli->inbuf) > (smb_ss_field + 8 - 4)) &&
 278                         (SVAL(cli->inbuf,smb_flg2) & FLAGS2_SMB_SECURITY_SIGNATURES) &&
 279                         memcmp(&cli->outbuf[smb_ss_field],&cli->inbuf[smb_ss_field],8) == 0 &&
 280                         cli_is_error(cli)) {
 281
 282                         /*
 283                          * Reflected signature on login error.
 284                          * Set bad sig but don't close fd.
 285                          */
 286                         cli->smb_rw_error = SMB_READ_BAD_SIG;
 287                         return true;
 288                 }
 289
 290                 DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
 291                 cli->smb_rw_error = SMB_READ_BAD_SIG;
 292                 close(cli->fd);
 293                 cli->fd = -1;
 294                 return false;
 295         };
 296         return true;
 297 }
 298
 299 static ssize_t write_socket(int fd, const char *buf, size_t len)
 300 {
 301         ssize_t ret=0;
 302
 303         DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
 304         ret = write_data(fd,buf,len);
 305
 306         DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
 307         if(ret <= 0)
 308                 DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
 309                         (int)len, fd, strerror(errno) ));
 310
 311         return(ret);
 312 }
 313
 314 /****************************************************************************
 315  Send an smb to a fd.
 316 ****************************************************************************/
 317
 318 bool cli_send_smb(struct cli_state *cli)
 319 {
 320         size_t len;
 321         size_t nwritten=0;
 322         ssize_t ret;
 323         char *buf_out = cli->outbuf;
 324         bool enc_on = cli_encryption_on(cli);
 325         uint32_t seqnum;
 326
 327         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 328         if (cli->fd == -1)
 329                 return false;
 330
 331         cli_calculate_sign_mac(cli, cli->outbuf, &seqnum);
 332
 333         if (!cli_state_set_seqnum(cli, cli->mid, seqnum)) {
 334                 DEBUG(0,("Failed to store mid[%u]/seqnum[%u]\n",
 335                         (unsigned int)cli->mid,
 336                         (unsigned int)seqnum));
 337                 return false;
 338         }
 339
 340         if (enc_on) {
 341                 NTSTATUS status = cli_encrypt_message(cli, cli->outbuf,
 342                                                       &buf_out);
 343                 if (!NT_STATUS_IS_OK(status)) {
 344                         close(cli->fd);
 345                         cli->fd = -1;
 346                         cli->smb_rw_error = SMB_WRITE_ERROR;
 347                         DEBUG(0,("Error in encrypting client message. Error %s\n",
 348                                 nt_errstr(status) ));
 349                         return false;
 350                 }
 351         }
 352
 353         len = smb_len(buf_out) + 4;
 354
 355         while (nwritten < len) {
 356                 ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
 357                 if (ret <= 0) {
 358                         if (enc_on) {
 359                                 cli_free_enc_buffer(cli, buf_out);
 360                         }
 361                         close(cli->fd);
 362                         cli->fd = -1;
 363                         cli->smb_rw_error = SMB_WRITE_ERROR;
 364                         DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
 365                                 (int)len,(int)ret, strerror(errno) ));
 366                         return false;
 367                 }
 368                 nwritten += ret;
 369         }
 370
 371         if (enc_on) {
 372                 cli_free_enc_buffer(cli, buf_out);
 373         }
 374
 375         /* Increment the mid so we can tell between responses. */
 376         cli->mid++;
 377         if (!cli->mid)
 378                 cli->mid++;
 379         return true;
 380 }
 381
 382 /****************************************************************************
 383  Setup basics in a outgoing packet.
 384 ****************************************************************************/
 385
 386 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
 387 {
 388         uint16 flags2;
 389         cli->rap_error = 0;
 390         SIVAL(buf,smb_rcls,0);
 391         SSVAL(buf,smb_pid,cli->pid);
 392         memset(buf+smb_pidhigh, 0, 12);
 393         SSVAL(buf,smb_uid,cli->vuid);
 394         SSVAL(buf,smb_mid,cli->mid);
 395
 396         if (cli->protocol <= PROTOCOL_CORE) {
 397                 return;
 398         }
 399
 400         if (cli->case_sensitive) {
 401                 SCVAL(buf,smb_flg,0x0);
 402         } else {
 403                 /* Default setting, case insensitive. */
 404                 SCVAL(buf,smb_flg,0x8);
 405         }
 406         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 407         if (cli->capabilities & CAP_UNICODE)
 408                 flags2 |= FLAGS2_UNICODE_STRINGS;
 409         if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
 410                 flags2 |= FLAGS2_DFS_PATHNAMES;
 411         if (cli->capabilities & CAP_STATUS32)
 412                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 413         if (cli->use_spnego)
 414                 flags2 |= FLAGS2_EXTENDED_SECURITY;
 415         SSVAL(buf,smb_flg2, flags2);
 416 }
 417
 418 void cli_setup_packet(struct cli_state *cli)
 419 {
 420         cli_setup_packet_buf(cli, cli->outbuf);
 421 }
 422
 423 /****************************************************************************
 424  Setup the bcc length of the packet from a pointer to the end of the data.
 425 ****************************************************************************/
 426
 427 void cli_setup_bcc(struct cli_state *cli, void *p)
 428 {
 429         set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 430 }
 431
 432 /****************************************************************************
 433  Initialize Domain, user or password.
 434 ****************************************************************************/
 435
 436 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
 437 {
 438         TALLOC_FREE(cli->domain);
 439         cli->domain = talloc_strdup(cli, domain ? domain : "");
 440         if (cli->domain == NULL) {
 441                 return NT_STATUS_NO_MEMORY;
 442         }
 443         return NT_STATUS_OK;
 444 }
 445
 446 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
 447 {
 448         TALLOC_FREE(cli->user_name);
 449         cli->user_name = talloc_strdup(cli, username ? username : "");
 450         if (cli->user_name == NULL) {
 451                 return NT_STATUS_NO_MEMORY;
 452         }
 453         return NT_STATUS_OK;
 454 }
 455
 456 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
 457 {
 458         TALLOC_FREE(cli->password);
 459
 460         /* Password can be NULL. */
 461         if (password) {
 462                 cli->password = talloc_strdup(cli, password);
 463                 if (cli->password == NULL) {
 464                         return NT_STATUS_NO_MEMORY;
 465                 }
 466         } else {
 467                 /* Use zero NTLMSSP hashes and session key. */
 468                 cli->password = NULL;
 469         }
 470
 471         return NT_STATUS_OK;
 472 }
 473
 474 /****************************************************************************
 475  Initialise credentials of a client structure.
 476 ****************************************************************************/
 477
 478 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 479 {
 480         NTSTATUS status = cli_set_username(cli, username);
 481         if (!NT_STATUS_IS_OK(status)) {
 482                 return status;
 483         }
 484         status = cli_set_domain(cli, domain);
 485         if (!NT_STATUS_IS_OK(status)) {
 486                 return status;
 487         }
 488         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 489
 490         return cli_set_password(cli, password);
 491 }
 492
 493 /****************************************************************************
 494  Initialise a client structure. Always returns a talloc'ed struct.
 495  Set the signing state (used from the command line).
 496 ****************************************************************************/
 497
 498 struct cli_state *cli_initialise_ex(int signing_state)
 499 {
 500         struct cli_state *cli = NULL;
 501         bool allow_smb_signing = false;
 502         bool mandatory_signing = false;
 503
 504         /* Check the effective uid - make sure we are not setuid */
 505         if (is_setuid_root()) {
 506                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 507                 return NULL;
 508         }
 509
 510         cli = TALLOC_ZERO_P(NULL, struct cli_state);
 511         if (!cli) {
 512                 return NULL;
 513         }
 514
 515         cli->dfs_mountpoint = talloc_strdup(cli, "");
 516         if (!cli->dfs_mountpoint) {
 517                 goto error;
 518         }
 519         cli->port = 0;
 520         cli->fd = -1;
 521         cli->cnum = -1;
 522         cli->pid = (uint16)sys_getpid();
 523         cli->mid = 1;
 524         cli->vuid = UID_FIELD_INVALID;
 525         cli->protocol = PROTOCOL_NT1;
 526         cli->timeout = 20000; /* Timeout is in milliseconds. */
 527         cli->bufsize = CLI_BUFFER_SIZE+4;
 528         cli->max_xmit = cli->bufsize;
 529         cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 530         cli->seqnum = 0;
 531         cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 532         cli->oplock_handler = cli_oplock_ack;
 533         cli->case_sensitive = false;
 534         cli->smb_rw_error = SMB_READ_OK;
 535
 536         cli->use_spnego = lp_client_use_spnego();
 537
 538         cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
 539
 540         /* Set the CLI_FORCE_DOSERR environment variable to test
 541            client routines using DOS errors instead of STATUS32
 542            ones.  This intended only as a temporary hack. */
 543         if (getenv("CLI_FORCE_DOSERR"))
 544                 cli->force_dos_errors = true;
 545
 546         if (lp_client_signing()) {
 547                 allow_smb_signing = true;
 548         }
 549
 550         if (lp_client_signing() == Required) {
 551                 mandatory_signing = true;
 552         }
 553
 554         if (signing_state != Undefined) {
 555                 allow_smb_signing = true;
 556         }
 557
 558         if (signing_state == false) {
 559                 allow_smb_signing = false;
 560                 mandatory_signing = false;
 561         }
 562
 563         if (signing_state == Required) {
 564                 mandatory_signing = true;
 565         }
 566
 567         if (!cli->outbuf || !cli->inbuf)
 568                 goto error;
 569
 570         memset(cli->outbuf, 0, cli->bufsize);
 571         memset(cli->inbuf, 0, cli->bufsize);
 572
 573
 574 #if defined(DEVELOPER)
 575         /* just because we over-allocate, doesn't mean it's right to use it */
 576         clobber_region(__FUNCTION__, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
 577         clobber_region(__FUNCTION__, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
 578 #endif
 579
 580         /* initialise signing */
 581         cli->signing_state = smb_signing_init(cli,
 582                                               allow_smb_signing,
 583                                               mandatory_signing);
 584         if (!cli->signing_state) {
 585                 goto error;
 586         }
 587
 588         cli->outgoing = tevent_queue_create(cli, "cli_outgoing");
 589         if (cli->outgoing == NULL) {
 590                 goto error;
 591         }
 592         cli->pending = NULL;
 593
 594         cli->initialised = 1;
 595
 596         return cli;
 597
 598         /* Clean up after malloc() error */
 599
 600  error:
 601
 602         SAFE_FREE(cli->inbuf);
 603         SAFE_FREE(cli->outbuf);
 604         TALLOC_FREE(cli);
 605         return NULL;
 606 }
 607
 608 struct cli_state *cli_initialise(void)
 609 {
 610         return cli_initialise_ex(Undefined);
 611 }
 612
 613 /****************************************************************************
 614  Close all pipes open on this session.
 615 ****************************************************************************/
 616
 617 void cli_nt_pipes_close(struct cli_state *cli)
 618 {
 619         while (cli->pipe_list != NULL) {
 620                 /*
 621                  * No TALLOC_FREE here!
 622                  */
 623                 talloc_free(cli->pipe_list);
 624         }
 625 }
 626
 627 /****************************************************************************
 628  Shutdown a client structure.
 629 ****************************************************************************/
 630
 631 static void _cli_shutdown(struct cli_state *cli)
 632 {
 633         cli_nt_pipes_close(cli);
 634
 635         /*
 636          * tell our peer to free his resources.  Wihtout this, when an
 637          * application attempts to do a graceful shutdown and calls
 638          * smbc_free_context() to clean up all connections, some connections
 639          * can remain active on the peer end, until some (long) timeout period
 640          * later.  This tree disconnect forces the peer to clean up, since the
 641          * connection will be going away.
 642          *
 643          * Also, do not do tree disconnect when cli->smb_rw_error is SMB_DO_NOT_DO_TDIS
 644          * the only user for this so far is smbmount which passes opened connection
 645          * down to kernel's smbfs module.
 646          */
 647         if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != SMB_DO_NOT_DO_TDIS ) ) {
 648                 cli_tdis(cli);
 649         }
 650
 651         SAFE_FREE(cli->outbuf);
 652         SAFE_FREE(cli->inbuf);
 653
 654         data_blob_free(&cli->secblob);
 655         data_blob_free(&cli->user_session_key);
 656
 657         if (cli->fd != -1) {
 658                 close(cli->fd);
 659         }
 660         cli->fd = -1;
 661         cli->smb_rw_error = SMB_READ_OK;
 662
 663         /*
 664          * Need to free pending first, they remove themselves
 665          */
 666         while (cli->pending) {
 667                 talloc_free(cli->pending[0]);
 668         }
 669         TALLOC_FREE(cli);
 670 }
 671
 672 void cli_shutdown(struct cli_state *cli)
 673 {
 674         struct cli_state *cli_head;
 675         if (cli == NULL) {
 676                 return;
 677         }
 678         DLIST_HEAD(cli, cli_head);
 679         if (cli_head == cli) {
 680                 /*
 681                  * head of a DFS list, shutdown all subsidiary DFS
 682                  * connections.
 683                  */
 684                 struct cli_state *p, *next;
 685
 686                 for (p = cli_head->next; p; p = next) {
 687                         next = p->next;
 688                         DLIST_REMOVE(cli_head, p);
 689                         _cli_shutdown(p);
 690                 }
 691         } else {
 692                 DLIST_REMOVE(cli_head, cli);
 693         }
 694
 695         _cli_shutdown(cli);
 696 }
 697
 698 /****************************************************************************
 699  Set socket options on a open connection.
 700 ****************************************************************************/
 701
 702 void cli_sockopt(struct cli_state *cli, const char *options)
 703 {
 704         set_socket_options(cli->fd, options);
 705 }
 706
 707 /****************************************************************************
 708  Set the PID to use for smb messages. Return the old pid.
 709 ****************************************************************************/
 710
 711 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 712 {
 713         uint16 ret = cli->pid;
 714         cli->pid = pid;
 715         return ret;
 716 }
 717
 718 /****************************************************************************
 719  Set the case sensitivity flag on the packets. Returns old state.
 720 ****************************************************************************/
 721
 722 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 723 {
 724         bool ret = cli->case_sensitive;
 725         cli->case_sensitive = case_sensitive;
 726         return ret;
 727 }
 728
 729 struct cli_echo_state {
 730         uint16_t vwv[1];
 731         DATA_BLOB data;
 732         int num_echos;
 733 };
 734
 735 static void cli_echo_done(struct tevent_req *subreq);
 736
 737 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 738                                  struct cli_state *cli, uint16_t num_echos,
 739                                  DATA_BLOB data)
 740 {
 741         struct tevent_req *req, *subreq;
 742         struct cli_echo_state *state;
 743
 744         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 745         if (req == NULL) {
 746                 return NULL;
 747         }
 748         SSVAL(state->vwv, 0, num_echos);
 749         state->data = data;
 750         state->num_echos = num_echos;
 751
 752         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 753                               data.length, data.data);
 754         if (subreq == NULL) {
 755                 goto fail;
 756         }
 757         tevent_req_set_callback(subreq, cli_echo_done, req);
 758         return req;
 759  fail:
 760         TALLOC_FREE(req);
 761         return NULL;
 762 }
 763
 764 static void cli_echo_done(struct tevent_req *subreq)
 765 {
 766         struct tevent_req *req = tevent_req_callback_data(
 767                 subreq, struct tevent_req);
 768         struct cli_echo_state *state = tevent_req_data(
 769                 req, struct cli_echo_state);
 770         NTSTATUS status;
 771         uint32_t num_bytes;
 772         uint8_t *bytes;
 773         uint8_t *inbuf;
 774
 775         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 776                               &num_bytes, &bytes);
 777         if (!NT_STATUS_IS_OK(status)) {
 778                 tevent_req_nterror(req, status);
 779                 return;
 780         }
 781         if ((num_bytes != state->data.length)
 782             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 783                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 784                 return;
 785         }
 786
 787         state->num_echos -=1;
 788         if (state->num_echos == 0) {
 789                 tevent_req_done(req);
 790                 return;
 791         }
 792
 793         if (!cli_smb_req_set_pending(subreq)) {
 794                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 795                 return;
 796         }
 797 }
 798
 799 /**
 800  * Get the result out from an echo request
 801  * @param[in] req       The async_req from cli_echo_send
 802  * @retval Did the server reply correctly?
 803  */
 804
 805 NTSTATUS cli_echo_recv(struct tevent_req *req)
 806 {
 807         return tevent_req_simple_recv_ntstatus(req);
 808 }
 809
 810 /**
 811  * @brief Send/Receive SMBEcho requests
 812  * @param[in] mem_ctx   The memory context to put the async_req on
 813  * @param[in] ev        The event context that will call us back
 814  * @param[in] cli       The connection to send the echo to
 815  * @param[in] num_echos How many times do we want to get the reply?
 816  * @param[in] data      The data we want to get back
 817  * @retval Did the server reply correctly?
 818  */
 819
 820 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 821 {
 822         TALLOC_CTX *frame = talloc_stackframe();
 823         struct event_context *ev;
 824         struct tevent_req *req;
 825         NTSTATUS status = NT_STATUS_OK;
 826
 827         if (cli_has_async_calls(cli)) {
 828                 /*
 829                  * Can't use sync call while an async call is in flight
 830                  */
 831                 status = NT_STATUS_INVALID_PARAMETER;
 832                 goto fail;
 833         }
 834
 835         ev = event_context_init(frame);
 836         if (ev == NULL) {
 837                 status = NT_STATUS_NO_MEMORY;
 838                 goto fail;
 839         }
 840
 841         req = cli_echo_send(frame, ev, cli, num_echos, data);
 842         if (req == NULL) {
 843                 status = NT_STATUS_NO_MEMORY;
 844                 goto fail;
 845         }
 846
 847         if (!tevent_req_poll(req, ev)) {
 848                 status = map_nt_error_from_unix(errno);
 849                 goto fail;
 850         }
 851
 852         status = cli_echo_recv(req);
 853  fail:
 854         TALLOC_FREE(frame);
 855         if (!NT_STATUS_IS_OK(status)) {
 856                 cli_set_error(cli, status);
 857         }
 858         return status;
 859 }
 860
 861 /**
 862  * Is the SMB command able to hold an AND_X successor
 863  * @param[in] cmd       The SMB command in question
 864  * @retval Can we add a chained request after "cmd"?
 865  */
 866 bool is_andx_req(uint8_t cmd)
 867 {
 868         switch (cmd) {
 869         case SMBtconX:
 870         case SMBlockingX:
 871         case SMBopenX:
 872         case SMBreadX:
 873         case SMBwriteX:
 874         case SMBsesssetupX:
 875         case SMBulogoffX:
 876         case SMBntcreateX:
 877                 return true;
 878                 break;
 879         default:
 880                 break;
 881         }
 882
 883         return false;
 884 }
 885
 886 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 887                  uint8_t smb_command, uint8_t additional_flags,
 888                  uint8_t wct, uint16_t *vwv,
 889                  uint32_t num_bytes, const uint8_t *bytes,
 890                  struct tevent_req **result_parent,
 891                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 892                  uint32_t *pnum_bytes, uint8_t **pbytes)
 893 {
 894         struct tevent_context *ev;
 895         struct tevent_req *req = NULL;
 896         NTSTATUS status = NT_STATUS_NO_MEMORY;
 897
 898         if (cli_has_async_calls(cli)) {
 899                 return NT_STATUS_INVALID_PARAMETER;
 900         }
 901         ev = tevent_context_init(mem_ctx);
 902         if (ev == NULL) {
 903                 goto fail;
 904         }
 905         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 906                            wct, vwv, num_bytes, bytes);
 907         if (req == NULL) {
 908                 goto fail;
 909         }
 910         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 911                 goto fail;
 912         }
 913         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 914                               pnum_bytes, pbytes);
 915 fail:
 916         TALLOC_FREE(ev);
 917         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 918                 *result_parent = req;
 919         }
 920         return status;
 921 }