source3/libsmb/clientgen.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client generic functions
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Jeremy Allison 2007.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "libsmb/libsmb.h"
  23 #include "../lib/util/tevent_ntstatus.h"
  24 #include "smb_signing.h"
  25 #include "async_smb.h"
  26
  27 /*******************************************************************
  28  Setup the word count and byte count for a client smb message.
  29 ********************************************************************/
  30
  31 int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
  32 {
  33         if (zero && (num_words || num_bytes)) {
  34                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  35         }
  36         SCVAL(buf,smb_wct,num_words);
  37         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  38         smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
  39         return (smb_size + num_words*2 + num_bytes);
  40 }
  41
  42 /****************************************************************************
  43  Change the timeout (in milliseconds).
  44 ****************************************************************************/
  45
  46 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  47 {
  48         unsigned int old_timeout = cli->timeout;
  49         cli->timeout = timeout;
  50         return old_timeout;
  51 }
  52
  53 /****************************************************************************
  54  Change the port number used to call on.
  55 ****************************************************************************/
  56
  57 void cli_set_port(struct cli_state *cli, int port)
  58 {
  59         cli->port = port;
  60 }
  61
  62 /****************************************************************************
  63  convenience routine to find if we negotiated ucs2
  64 ****************************************************************************/
  65
  66 bool cli_ucs2(struct cli_state *cli)
  67 {
  68         return ((cli->capabilities & CAP_UNICODE) != 0);
  69 }
  70
  71
  72 /****************************************************************************
  73  Read an smb from a fd ignoring all keepalive packets.
  74  The timeout is in milliseconds
  75
  76  This is exactly the same as receive_smb except that it never returns
  77  a session keepalive packet (just as receive_smb used to do).
  78  receive_smb was changed to return keepalives as the oplock processing means this call
  79  should never go into a blocking read.
  80 ****************************************************************************/
  81
  82 static ssize_t client_receive_smb(struct cli_state *cli, size_t maxlen)
  83 {
  84         size_t len;
  85
  86         for(;;) {
  87                 NTSTATUS status;
  88
  89                 set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);
  90
  91                 status = receive_smb_raw(cli->fd, cli->inbuf, cli->bufsize,
  92                                         cli->timeout, maxlen, &len);
  93                 if (!NT_STATUS_IS_OK(status)) {
  94                         DEBUG(10,("client_receive_smb failed\n"));
  95                         show_msg(cli->inbuf);
  96
  97                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
  98                                 set_smb_read_error(&cli->smb_rw_error,
  99                                                    SMB_READ_EOF);
 100                                 return -1;
 101                         }
 102
 103                         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 104                                 set_smb_read_error(&cli->smb_rw_error,
 105                                                    SMB_READ_TIMEOUT);
 106                                 return -1;
 107                         }
 108
 109                         set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
 110                         return -1;
 111                 }
 112
 113                 /*
 114                  * I don't believe len can be < 0 with NT_STATUS_OK
 115                  * returned above, but this check doesn't hurt. JRA.
 116                  */
 117
 118                 if ((ssize_t)len < 0) {
 119                         return len;
 120                 }
 121
 122                 /* Ignore session keepalive packets. */
 123                 if(CVAL(cli->inbuf,0) != SMBkeepalive) {
 124                         break;
 125                 }
 126         }
 127
 128         if (cli_encryption_on(cli)) {
 129                 NTSTATUS status = cli_decrypt_message(cli);
 130                 if (!NT_STATUS_IS_OK(status)) {
 131                         DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
 132                                 nt_errstr(status)));
 133                         cli->smb_rw_error = SMB_READ_BAD_DECRYPT;
 134                         return -1;
 135                 }
 136         }
 137
 138         show_msg(cli->inbuf);
 139         return len;
 140 }
 141
 142 static bool cli_state_set_seqnum(struct cli_state *cli, uint16_t mid, uint32_t seqnum)
 143 {
 144         struct cli_state_seqnum *c;
 145
 146         for (c = cli->seqnum; c; c = c->next) {
 147                 if (c->mid == mid) {
 148                         c->seqnum = seqnum;
 149                         return true;
 150                 }
 151         }
 152
 153         c = talloc_zero(cli, struct cli_state_seqnum);
 154         if (!c) {
 155                 return false;
 156         }
 157
 158         c->mid = mid;
 159         c->seqnum = seqnum;
 160         c->persistent = false;
 161         DLIST_ADD_END(cli->seqnum, c, struct cli_state_seqnum *);
 162
 163         return true;
 164 }
 165
 166 bool cli_state_seqnum_persistent(struct cli_state *cli,
 167                                  uint16_t mid)
 168 {
 169         struct cli_state_seqnum *c;
 170
 171         for (c = cli->seqnum; c; c = c->next) {
 172                 if (c->mid == mid) {
 173                         c->persistent = true;
 174                         return true;
 175                 }
 176         }
 177
 178         return false;
 179 }
 180
 181 bool cli_state_seqnum_remove(struct cli_state *cli,
 182                              uint16_t mid)
 183 {
 184         struct cli_state_seqnum *c;
 185
 186         for (c = cli->seqnum; c; c = c->next) {
 187                 if (c->mid == mid) {
 188                         DLIST_REMOVE(cli->seqnum, c);
 189                         TALLOC_FREE(c);
 190                         return true;
 191                 }
 192         }
 193
 194         return false;
 195 }
 196
 197 static uint32_t cli_state_get_seqnum(struct cli_state *cli, uint16_t mid)
 198 {
 199         struct cli_state_seqnum *c;
 200
 201         for (c = cli->seqnum; c; c = c->next) {
 202                 if (c->mid == mid) {
 203                         uint32_t seqnum = c->seqnum;
 204                         if (!c->persistent) {
 205                                 DLIST_REMOVE(cli->seqnum, c);
 206                                 TALLOC_FREE(c);
 207                         }
 208                         return seqnum;
 209                 }
 210         }
 211
 212         return 0;
 213 }
 214
 215 /****************************************************************************
 216  Recv an smb.
 217 ****************************************************************************/
 218
 219 bool cli_receive_smb(struct cli_state *cli)
 220 {
 221         ssize_t len;
 222         uint16_t mid;
 223         uint32_t seqnum;
 224
 225         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 226         if (cli->fd == -1)
 227                 return false;
 228
 229  again:
 230         len = client_receive_smb(cli, 0);
 231
 232         if (len > 0) {
 233                 /* it might be an oplock break request */
 234                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
 235                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
 236                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
 237                     SVAL(cli->inbuf,smb_vwv7) == 0) {
 238                         if (cli->oplock_handler) {
 239                                 int fnum = SVAL(cli->inbuf,smb_vwv2);
 240                                 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
 241                                 if (!NT_STATUS_IS_OK(cli->oplock_handler(cli, fnum, level))) {
 242                                         return false;
 243                                 }
 244                         }
 245                         /* try to prevent loops */
 246                         SCVAL(cli->inbuf,smb_com,0xFF);
 247                         goto again;
 248                 }
 249         }
 250
 251         /* If the server is not responding, note that now */
 252         if (len < 0) {
 253                 /*
 254                  * only log if the connection should still be open and not when
 255                  * the connection was closed due to a dropped ip message
 256                  */
 257                 if (cli->fd != -1) {
 258                         char addr[INET6_ADDRSTRLEN];
 259                         print_sockaddr(addr, sizeof(addr), &cli->dest_ss);
 260                         DEBUG(0, ("Receiving SMB: Server %s stopped responding\n",
 261                                 addr));
 262                         close(cli->fd);
 263                         cli->fd = -1;
 264                 }
 265                 return false;
 266         }
 267
 268         mid = SVAL(cli->inbuf,smb_mid);
 269         seqnum = cli_state_get_seqnum(cli, mid);
 270
 271         if (!cli_check_sign_mac(cli, cli->inbuf, seqnum+1)) {
 272                 /*
 273                  * If we get a signature failure in sessionsetup, then
 274                  * the server sometimes just reflects the sent signature
 275                  * back to us. Detect this and allow the upper layer to
 276                  * retrieve the correct Windows error message.
 277                  */
 278                 if (CVAL(cli->outbuf,smb_com) == SMBsesssetupX &&
 279                         (smb_len(cli->inbuf) > (smb_ss_field + 8 - 4)) &&
 280                         (SVAL(cli->inbuf,smb_flg2) & FLAGS2_SMB_SECURITY_SIGNATURES) &&
 281                         memcmp(&cli->outbuf[smb_ss_field],&cli->inbuf[smb_ss_field],8) == 0 &&
 282                         cli_is_error(cli)) {
 283
 284                         /*
 285                          * Reflected signature on login error.
 286                          * Set bad sig but don't close fd.
 287                          */
 288                         cli->smb_rw_error = SMB_READ_BAD_SIG;
 289                         return true;
 290                 }
 291
 292                 DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
 293                 cli->smb_rw_error = SMB_READ_BAD_SIG;
 294                 close(cli->fd);
 295                 cli->fd = -1;
 296                 return false;
 297         };
 298         return true;
 299 }
 300
 301 static ssize_t write_socket(int fd, const char *buf, size_t len)
 302 {
 303         ssize_t ret=0;
 304
 305         DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
 306         ret = write_data(fd,buf,len);
 307
 308         DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
 309         if(ret <= 0)
 310                 DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
 311                         (int)len, fd, strerror(errno) ));
 312
 313         return(ret);
 314 }
 315
 316 /****************************************************************************
 317  Send an smb to a fd.
 318 ****************************************************************************/
 319
 320 bool cli_send_smb(struct cli_state *cli)
 321 {
 322         size_t len;
 323         size_t nwritten=0;
 324         ssize_t ret;
 325         char *buf_out = cli->outbuf;
 326         bool enc_on = cli_encryption_on(cli);
 327         uint32_t seqnum;
 328
 329         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 330         if (cli->fd == -1)
 331                 return false;
 332
 333         cli_calculate_sign_mac(cli, cli->outbuf, &seqnum);
 334
 335         if (!cli_state_set_seqnum(cli, cli->mid, seqnum)) {
 336                 DEBUG(0,("Failed to store mid[%u]/seqnum[%u]\n",
 337                         (unsigned int)cli->mid,
 338                         (unsigned int)seqnum));
 339                 return false;
 340         }
 341
 342         if (enc_on) {
 343                 NTSTATUS status = cli_encrypt_message(cli, cli->outbuf,
 344                                                       &buf_out);
 345                 if (!NT_STATUS_IS_OK(status)) {
 346                         close(cli->fd);
 347                         cli->fd = -1;
 348                         cli->smb_rw_error = SMB_WRITE_ERROR;
 349                         DEBUG(0,("Error in encrypting client message. Error %s\n",
 350                                 nt_errstr(status) ));
 351                         return false;
 352                 }
 353         }
 354
 355         len = smb_len(buf_out) + 4;
 356
 357         while (nwritten < len) {
 358                 ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
 359                 if (ret <= 0) {
 360                         if (enc_on) {
 361                                 cli_free_enc_buffer(cli, buf_out);
 362                         }
 363                         close(cli->fd);
 364                         cli->fd = -1;
 365                         cli->smb_rw_error = SMB_WRITE_ERROR;
 366                         DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
 367                                 (int)len,(int)ret, strerror(errno) ));
 368                         return false;
 369                 }
 370                 nwritten += ret;
 371         }
 372
 373         if (enc_on) {
 374                 cli_free_enc_buffer(cli, buf_out);
 375         }
 376
 377         /* Increment the mid so we can tell between responses. */
 378         cli->mid++;
 379         if (!cli->mid)
 380                 cli->mid++;
 381         return true;
 382 }
 383
 384 /****************************************************************************
 385  Setup basics in a outgoing packet.
 386 ****************************************************************************/
 387
 388 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
 389 {
 390         uint16 flags2;
 391         cli->rap_error = 0;
 392         SIVAL(buf,smb_rcls,0);
 393         SSVAL(buf,smb_pid,cli->pid);
 394         memset(buf+smb_pidhigh, 0, 12);
 395         SSVAL(buf,smb_uid,cli->vuid);
 396         SSVAL(buf,smb_mid,cli->mid);
 397
 398         if (cli->protocol <= PROTOCOL_CORE) {
 399                 return;
 400         }
 401
 402         if (cli->case_sensitive) {
 403                 SCVAL(buf,smb_flg,0x0);
 404         } else {
 405                 /* Default setting, case insensitive. */
 406                 SCVAL(buf,smb_flg,0x8);
 407         }
 408         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 409         if (cli->capabilities & CAP_UNICODE)
 410                 flags2 |= FLAGS2_UNICODE_STRINGS;
 411         if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
 412                 flags2 |= FLAGS2_DFS_PATHNAMES;
 413         if (cli->capabilities & CAP_STATUS32)
 414                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 415         if (cli->use_spnego)
 416                 flags2 |= FLAGS2_EXTENDED_SECURITY;
 417         SSVAL(buf,smb_flg2, flags2);
 418 }
 419
 420 void cli_setup_packet(struct cli_state *cli)
 421 {
 422         cli_setup_packet_buf(cli, cli->outbuf);
 423 }
 424
 425 /****************************************************************************
 426  Setup the bcc length of the packet from a pointer to the end of the data.
 427 ****************************************************************************/
 428
 429 void cli_setup_bcc(struct cli_state *cli, void *p)
 430 {
 431         set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 432 }
 433
 434 /****************************************************************************
 435  Initialize Domain, user or password.
 436 ****************************************************************************/
 437
 438 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
 439 {
 440         TALLOC_FREE(cli->domain);
 441         cli->domain = talloc_strdup(cli, domain ? domain : "");
 442         if (cli->domain == NULL) {
 443                 return NT_STATUS_NO_MEMORY;
 444         }
 445         return NT_STATUS_OK;
 446 }
 447
 448 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
 449 {
 450         TALLOC_FREE(cli->user_name);
 451         cli->user_name = talloc_strdup(cli, username ? username : "");
 452         if (cli->user_name == NULL) {
 453                 return NT_STATUS_NO_MEMORY;
 454         }
 455         return NT_STATUS_OK;
 456 }
 457
 458 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
 459 {
 460         TALLOC_FREE(cli->password);
 461
 462         /* Password can be NULL. */
 463         if (password) {
 464                 cli->password = talloc_strdup(cli, password);
 465                 if (cli->password == NULL) {
 466                         return NT_STATUS_NO_MEMORY;
 467                 }
 468         } else {
 469                 /* Use zero NTLMSSP hashes and session key. */
 470                 cli->password = NULL;
 471         }
 472
 473         return NT_STATUS_OK;
 474 }
 475
 476 /****************************************************************************
 477  Initialise credentials of a client structure.
 478 ****************************************************************************/
 479
 480 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 481 {
 482         NTSTATUS status = cli_set_username(cli, username);
 483         if (!NT_STATUS_IS_OK(status)) {
 484                 return status;
 485         }
 486         status = cli_set_domain(cli, domain);
 487         if (!NT_STATUS_IS_OK(status)) {
 488                 return status;
 489         }
 490         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 491
 492         return cli_set_password(cli, password);
 493 }
 494
 495 /****************************************************************************
 496  Initialise a client structure. Always returns a talloc'ed struct.
 497  Set the signing state (used from the command line).
 498 ****************************************************************************/
 499
 500 struct cli_state *cli_initialise_ex(int signing_state)
 501 {
 502         struct cli_state *cli = NULL;
 503         bool allow_smb_signing = false;
 504         bool mandatory_signing = false;
 505
 506         /* Check the effective uid - make sure we are not setuid */
 507         if (is_setuid_root()) {
 508                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 509                 return NULL;
 510         }
 511
 512         cli = TALLOC_ZERO_P(NULL, struct cli_state);
 513         if (!cli) {
 514                 return NULL;
 515         }
 516
 517         cli->dfs_mountpoint = talloc_strdup(cli, "");
 518         if (!cli->dfs_mountpoint) {
 519                 goto error;
 520         }
 521         cli->port = 0;
 522         cli->fd = -1;
 523         cli->cnum = -1;
 524         cli->pid = (uint16)sys_getpid();
 525         cli->mid = 1;
 526         cli->vuid = UID_FIELD_INVALID;
 527         cli->protocol = PROTOCOL_NT1;
 528         cli->timeout = 20000; /* Timeout is in milliseconds. */
 529         cli->bufsize = CLI_BUFFER_SIZE+4;
 530         cli->max_xmit = cli->bufsize;
 531         cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 532         cli->seqnum = 0;
 533         cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 534         cli->oplock_handler = cli_oplock_ack;
 535         cli->case_sensitive = false;
 536         cli->smb_rw_error = SMB_READ_OK;
 537
 538         cli->use_spnego = lp_client_use_spnego();
 539
 540         cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
 541
 542         /* Set the CLI_FORCE_DOSERR environment variable to test
 543            client routines using DOS errors instead of STATUS32
 544            ones.  This intended only as a temporary hack. */
 545         if (getenv("CLI_FORCE_DOSERR"))
 546                 cli->force_dos_errors = true;
 547
 548         if (lp_client_signing()) {
 549                 allow_smb_signing = true;
 550         }
 551
 552         if (lp_client_signing() == Required) {
 553                 mandatory_signing = true;
 554         }
 555
 556         if (signing_state != Undefined) {
 557                 allow_smb_signing = true;
 558         }
 559
 560         if (signing_state == false) {
 561                 allow_smb_signing = false;
 562                 mandatory_signing = false;
 563         }
 564
 565         if (signing_state == Required) {
 566                 mandatory_signing = true;
 567         }
 568
 569         if (!cli->outbuf || !cli->inbuf)
 570                 goto error;
 571
 572         memset(cli->outbuf, 0, cli->bufsize);
 573         memset(cli->inbuf, 0, cli->bufsize);
 574
 575
 576 #if defined(DEVELOPER)
 577         /* just because we over-allocate, doesn't mean it's right to use it */
 578         clobber_region(__FUNCTION__, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
 579         clobber_region(__FUNCTION__, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
 580 #endif
 581
 582         /* initialise signing */
 583         cli->signing_state = smb_signing_init(cli,
 584                                               allow_smb_signing,
 585                                               mandatory_signing);
 586         if (!cli->signing_state) {
 587                 goto error;
 588         }
 589
 590         cli->outgoing = tevent_queue_create(cli, "cli_outgoing");
 591         if (cli->outgoing == NULL) {
 592                 goto error;
 593         }
 594         cli->pending = NULL;
 595
 596         cli->initialised = 1;
 597
 598         return cli;
 599
 600         /* Clean up after malloc() error */
 601
 602  error:
 603
 604         SAFE_FREE(cli->inbuf);
 605         SAFE_FREE(cli->outbuf);
 606         TALLOC_FREE(cli);
 607         return NULL;
 608 }
 609
 610 struct cli_state *cli_initialise(void)
 611 {
 612         return cli_initialise_ex(Undefined);
 613 }
 614
 615 /****************************************************************************
 616  Close all pipes open on this session.
 617 ****************************************************************************/
 618
 619 void cli_nt_pipes_close(struct cli_state *cli)
 620 {
 621         while (cli->pipe_list != NULL) {
 622                 /*
 623                  * No TALLOC_FREE here!
 624                  */
 625                 talloc_free(cli->pipe_list);
 626         }
 627 }
 628
 629 /****************************************************************************
 630  Shutdown a client structure.
 631 ****************************************************************************/
 632
 633 static void _cli_shutdown(struct cli_state *cli)
 634 {
 635         cli_nt_pipes_close(cli);
 636
 637         /*
 638          * tell our peer to free his resources.  Wihtout this, when an
 639          * application attempts to do a graceful shutdown and calls
 640          * smbc_free_context() to clean up all connections, some connections
 641          * can remain active on the peer end, until some (long) timeout period
 642          * later.  This tree disconnect forces the peer to clean up, since the
 643          * connection will be going away.
 644          *
 645          * Also, do not do tree disconnect when cli->smb_rw_error is SMB_DO_NOT_DO_TDIS
 646          * the only user for this so far is smbmount which passes opened connection
 647          * down to kernel's smbfs module.
 648          */
 649         if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != SMB_DO_NOT_DO_TDIS ) ) {
 650                 cli_tdis(cli);
 651         }
 652
 653         SAFE_FREE(cli->outbuf);
 654         SAFE_FREE(cli->inbuf);
 655
 656         data_blob_free(&cli->secblob);
 657         data_blob_free(&cli->user_session_key);
 658
 659         if (cli->fd != -1) {
 660                 close(cli->fd);
 661         }
 662         cli->fd = -1;
 663         cli->smb_rw_error = SMB_READ_OK;
 664
 665         /*
 666          * Need to free pending first, they remove themselves
 667          */
 668         while (cli->pending) {
 669                 talloc_free(cli->pending[0]);
 670         }
 671         TALLOC_FREE(cli);
 672 }
 673
 674 void cli_shutdown(struct cli_state *cli)
 675 {
 676         struct cli_state *cli_head;
 677         if (cli == NULL) {
 678                 return;
 679         }
 680         DLIST_HEAD(cli, cli_head);
 681         if (cli_head == cli) {
 682                 /*
 683                  * head of a DFS list, shutdown all subsidiary DFS
 684                  * connections.
 685                  */
 686                 struct cli_state *p, *next;
 687
 688                 for (p = cli_head->next; p; p = next) {
 689                         next = p->next;
 690                         DLIST_REMOVE(cli_head, p);
 691                         _cli_shutdown(p);
 692                 }
 693         } else {
 694                 DLIST_REMOVE(cli_head, cli);
 695         }
 696
 697         _cli_shutdown(cli);
 698 }
 699
 700 /****************************************************************************
 701  Set socket options on a open connection.
 702 ****************************************************************************/
 703
 704 void cli_sockopt(struct cli_state *cli, const char *options)
 705 {
 706         set_socket_options(cli->fd, options);
 707 }
 708
 709 /****************************************************************************
 710  Set the PID to use for smb messages. Return the old pid.
 711 ****************************************************************************/
 712
 713 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 714 {
 715         uint16 ret = cli->pid;
 716         cli->pid = pid;
 717         return ret;
 718 }
 719
 720 /****************************************************************************
 721  Set the case sensitivity flag on the packets. Returns old state.
 722 ****************************************************************************/
 723
 724 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 725 {
 726         bool ret = cli->case_sensitive;
 727         cli->case_sensitive = case_sensitive;
 728         return ret;
 729 }
 730
 731 struct cli_echo_state {
 732         uint16_t vwv[1];
 733         DATA_BLOB data;
 734         int num_echos;
 735 };
 736
 737 static void cli_echo_done(struct tevent_req *subreq);
 738
 739 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 740                                  struct cli_state *cli, uint16_t num_echos,
 741                                  DATA_BLOB data)
 742 {
 743         struct tevent_req *req, *subreq;
 744         struct cli_echo_state *state;
 745
 746         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 747         if (req == NULL) {
 748                 return NULL;
 749         }
 750         SSVAL(state->vwv, 0, num_echos);
 751         state->data = data;
 752         state->num_echos = num_echos;
 753
 754         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 755                               data.length, data.data);
 756         if (subreq == NULL) {
 757                 goto fail;
 758         }
 759         tevent_req_set_callback(subreq, cli_echo_done, req);
 760         return req;
 761  fail:
 762         TALLOC_FREE(req);
 763         return NULL;
 764 }
 765
 766 static void cli_echo_done(struct tevent_req *subreq)
 767 {
 768         struct tevent_req *req = tevent_req_callback_data(
 769                 subreq, struct tevent_req);
 770         struct cli_echo_state *state = tevent_req_data(
 771                 req, struct cli_echo_state);
 772         NTSTATUS status;
 773         uint32_t num_bytes;
 774         uint8_t *bytes;
 775         uint8_t *inbuf;
 776
 777         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 778                               &num_bytes, &bytes);
 779         if (!NT_STATUS_IS_OK(status)) {
 780                 tevent_req_nterror(req, status);
 781                 return;
 782         }
 783         if ((num_bytes != state->data.length)
 784             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 785                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 786                 return;
 787         }
 788
 789         state->num_echos -=1;
 790         if (state->num_echos == 0) {
 791                 tevent_req_done(req);
 792                 return;
 793         }
 794
 795         if (!cli_smb_req_set_pending(subreq)) {
 796                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 797                 return;
 798         }
 799 }
 800
 801 /**
 802  * Get the result out from an echo request
 803  * @param[in] req       The async_req from cli_echo_send
 804  * @retval Did the server reply correctly?
 805  */
 806
 807 NTSTATUS cli_echo_recv(struct tevent_req *req)
 808 {
 809         return tevent_req_simple_recv_ntstatus(req);
 810 }
 811
 812 /**
 813  * @brief Send/Receive SMBEcho requests
 814  * @param[in] mem_ctx   The memory context to put the async_req on
 815  * @param[in] ev        The event context that will call us back
 816  * @param[in] cli       The connection to send the echo to
 817  * @param[in] num_echos How many times do we want to get the reply?
 818  * @param[in] data      The data we want to get back
 819  * @retval Did the server reply correctly?
 820  */
 821
 822 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 823 {
 824         TALLOC_CTX *frame = talloc_stackframe();
 825         struct event_context *ev;
 826         struct tevent_req *req;
 827         NTSTATUS status = NT_STATUS_OK;
 828
 829         if (cli_has_async_calls(cli)) {
 830                 /*
 831                  * Can't use sync call while an async call is in flight
 832                  */
 833                 status = NT_STATUS_INVALID_PARAMETER;
 834                 goto fail;
 835         }
 836
 837         ev = event_context_init(frame);
 838         if (ev == NULL) {
 839                 status = NT_STATUS_NO_MEMORY;
 840                 goto fail;
 841         }
 842
 843         req = cli_echo_send(frame, ev, cli, num_echos, data);
 844         if (req == NULL) {
 845                 status = NT_STATUS_NO_MEMORY;
 846                 goto fail;
 847         }
 848
 849         if (!tevent_req_poll(req, ev)) {
 850                 status = map_nt_error_from_unix(errno);
 851                 goto fail;
 852         }
 853
 854         status = cli_echo_recv(req);
 855  fail:
 856         TALLOC_FREE(frame);
 857         if (!NT_STATUS_IS_OK(status)) {
 858                 cli_set_error(cli, status);
 859         }
 860         return status;
 861 }
 862
 863 /**
 864  * Is the SMB command able to hold an AND_X successor
 865  * @param[in] cmd       The SMB command in question
 866  * @retval Can we add a chained request after "cmd"?
 867  */
 868 bool is_andx_req(uint8_t cmd)
 869 {
 870         switch (cmd) {
 871         case SMBtconX:
 872         case SMBlockingX:
 873         case SMBopenX:
 874         case SMBreadX:
 875         case SMBwriteX:
 876         case SMBsesssetupX:
 877         case SMBulogoffX:
 878         case SMBntcreateX:
 879                 return true;
 880                 break;
 881         default:
 882                 break;
 883         }
 884
 885         return false;
 886 }
 887
 888 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 889                  uint8_t smb_command, uint8_t additional_flags,
 890                  uint8_t wct, uint16_t *vwv,
 891                  uint32_t num_bytes, const uint8_t *bytes,
 892                  struct tevent_req **result_parent,
 893                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 894                  uint32_t *pnum_bytes, uint8_t **pbytes)
 895 {
 896         struct tevent_context *ev;
 897         struct tevent_req *req = NULL;
 898         NTSTATUS status = NT_STATUS_NO_MEMORY;
 899
 900         if (cli_has_async_calls(cli)) {
 901                 return NT_STATUS_INVALID_PARAMETER;
 902         }
 903         ev = tevent_context_init(mem_ctx);
 904         if (ev == NULL) {
 905                 goto fail;
 906         }
 907         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 908                            wct, vwv, num_bytes, bytes);
 909         if (req == NULL) {
 910                 goto fail;
 911         }
 912         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 913                 goto fail;
 914         }
 915         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 916                               pnum_bytes, pbytes);
 917 fail:
 918         TALLOC_FREE(ev);
 919         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 920                 *result_parent = req;
 921         }
 922         return status;
 923 }