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 int cli_set_port(struct cli_state *cli, int port)
  54 {
  55         cli->port = port;
  56         return port;
  57 }
  58
  59 /****************************************************************************
  60  Read an smb from a fd ignoring all keepalive packets.
  61  The timeout is in milliseconds
  62
  63  This is exactly the same as receive_smb except that it never returns
  64  a session keepalive packet (just as receive_smb used to do).
  65  receive_smb was changed to return keepalives as the oplock processing means this call
  66  should never go into a blocking read.
  67 ****************************************************************************/
  68
  69 static ssize_t client_receive_smb(struct cli_state *cli, size_t maxlen)
  70 {
  71         size_t len;
  72
  73         for(;;) {
  74                 NTSTATUS status;
  75
  76                 set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);
  77
  78                 status = receive_smb_raw(cli->fd, cli->inbuf, cli->bufsize,
  79                                         cli->timeout, maxlen, &len);
  80                 if (!NT_STATUS_IS_OK(status)) {
  81                         DEBUG(10,("client_receive_smb failed\n"));
  82                         show_msg(cli->inbuf);
  83
  84                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
  85                                 set_smb_read_error(&cli->smb_rw_error,
  86                                                    SMB_READ_EOF);
  87                                 return -1;
  88                         }
  89
  90                         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
  91                                 set_smb_read_error(&cli->smb_rw_error,
  92                                                    SMB_READ_TIMEOUT);
  93                                 return -1;
  94                         }
  95
  96                         set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
  97                         return -1;
  98                 }
  99
 100                 /*
 101                  * I don't believe len can be < 0 with NT_STATUS_OK
 102                  * returned above, but this check doesn't hurt. JRA.
 103                  */
 104
 105                 if ((ssize_t)len < 0) {
 106                         return len;
 107                 }
 108
 109                 /* Ignore session keepalive packets. */
 110                 if(CVAL(cli->inbuf,0) != SMBkeepalive) {
 111                         break;
 112                 }
 113         }
 114
 115         if (cli_encryption_on(cli)) {
 116                 NTSTATUS status = cli_decrypt_message(cli);
 117                 if (!NT_STATUS_IS_OK(status)) {
 118                         DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
 119                                 nt_errstr(status)));
 120                         cli->smb_rw_error = SMB_READ_BAD_DECRYPT;
 121                         return -1;
 122                 }
 123         }
 124
 125         show_msg(cli->inbuf);
 126         return len;
 127 }
 128
 129 /****************************************************************************
 130  Recv an smb.
 131 ****************************************************************************/
 132
 133 bool cli_receive_smb(struct cli_state *cli)
 134 {
 135         ssize_t len;
 136
 137         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 138         if (cli->fd == -1)
 139                 return false;
 140
 141  again:
 142         len = client_receive_smb(cli, 0);
 143
 144         if (len > 0) {
 145                 /* it might be an oplock break request */
 146                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
 147                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
 148                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
 149                     SVAL(cli->inbuf,smb_vwv7) == 0) {
 150                         if (cli->oplock_handler) {
 151                                 int fnum = SVAL(cli->inbuf,smb_vwv2);
 152                                 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
 153                                 if (!cli->oplock_handler(cli, fnum, level)) {
 154                                         return false;
 155                                 }
 156                         }
 157                         /* try to prevent loops */
 158                         SCVAL(cli->inbuf,smb_com,0xFF);
 159                         goto again;
 160                 }
 161         }
 162
 163         /* If the server is not responding, note that now */
 164         if (len < 0) {
 165                 DEBUG(0, ("Receiving SMB: Server stopped responding\n"));
 166                 close(cli->fd);
 167                 cli->fd = -1;
 168                 return false;
 169         }
 170
 171         if (!cli_check_sign_mac(cli, cli->inbuf)) {
 172                 /*
 173                  * If we get a signature failure in sessionsetup, then
 174                  * the server sometimes just reflects the sent signature
 175                  * back to us. Detect this and allow the upper layer to
 176                  * retrieve the correct Windows error message.
 177                  */
 178                 if (CVAL(cli->outbuf,smb_com) == SMBsesssetupX &&
 179                         (smb_len(cli->inbuf) > (smb_ss_field + 8 - 4)) &&
 180                         (SVAL(cli->inbuf,smb_flg2) & FLAGS2_SMB_SECURITY_SIGNATURES) &&
 181                         memcmp(&cli->outbuf[smb_ss_field],&cli->inbuf[smb_ss_field],8) == 0 &&
 182                         cli_is_error(cli)) {
 183
 184                         /*
 185                          * Reflected signature on login error.
 186                          * Set bad sig but don't close fd.
 187                          */
 188                         cli->smb_rw_error = SMB_READ_BAD_SIG;
 189                         return true;
 190                 }
 191
 192                 DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
 193                 cli->smb_rw_error = SMB_READ_BAD_SIG;
 194                 close(cli->fd);
 195                 cli->fd = -1;
 196                 return false;
 197         };
 198         return true;
 199 }
 200
 201 /****************************************************************************
 202  Read the data portion of a readX smb.
 203  The timeout is in milliseconds
 204 ****************************************************************************/
 205
 206 ssize_t cli_receive_smb_data(struct cli_state *cli, char *buffer, size_t len)
 207 {
 208         NTSTATUS status;
 209
 210         set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);
 211
 212         status = read_socket_with_timeout(
 213                 cli->fd, buffer, len, len, cli->timeout, NULL);
 214         if (NT_STATUS_IS_OK(status)) {
 215                 return len;
 216         }
 217
 218         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
 219                 set_smb_read_error(&cli->smb_rw_error, SMB_READ_EOF);
 220                 return -1;
 221         }
 222
 223         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 224                 set_smb_read_error(&cli->smb_rw_error, SMB_READ_TIMEOUT);
 225                 return -1;
 226         }
 227
 228         set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
 229         return -1;
 230 }
 231
 232 static ssize_t write_socket(int fd, const char *buf, size_t len)
 233 {
 234         ssize_t ret=0;
 235
 236         DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
 237         ret = write_data(fd,buf,len);
 238
 239         DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
 240         if(ret <= 0)
 241                 DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
 242                         (int)len, fd, strerror(errno) ));
 243
 244         return(ret);
 245 }
 246
 247 /****************************************************************************
 248  Send an smb to a fd.
 249 ****************************************************************************/
 250
 251 bool cli_send_smb(struct cli_state *cli)
 252 {
 253         size_t len;
 254         size_t nwritten=0;
 255         ssize_t ret;
 256         char *buf_out = cli->outbuf;
 257         bool enc_on = cli_encryption_on(cli);
 258
 259         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 260         if (cli->fd == -1)
 261                 return false;
 262
 263         cli_calculate_sign_mac(cli, cli->outbuf);
 264
 265         if (enc_on) {
 266                 NTSTATUS status = cli_encrypt_message(cli, cli->outbuf,
 267                                                       &buf_out);
 268                 if (!NT_STATUS_IS_OK(status)) {
 269                         close(cli->fd);
 270                         cli->fd = -1;
 271                         cli->smb_rw_error = SMB_WRITE_ERROR;
 272                         DEBUG(0,("Error in encrypting client message. Error %s\n",
 273                                 nt_errstr(status) ));
 274                         return false;
 275                 }
 276         }
 277
 278         len = smb_len(buf_out) + 4;
 279
 280         while (nwritten < len) {
 281                 ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
 282                 if (ret <= 0) {
 283                         if (enc_on) {
 284                                 cli_free_enc_buffer(cli, buf_out);
 285                         }
 286                         close(cli->fd);
 287                         cli->fd = -1;
 288                         cli->smb_rw_error = SMB_WRITE_ERROR;
 289                         DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
 290                                 (int)len,(int)ret, strerror(errno) ));
 291                         return false;
 292                 }
 293                 nwritten += ret;
 294         }
 295
 296         if (enc_on) {
 297                 cli_free_enc_buffer(cli, buf_out);
 298         }
 299
 300         /* Increment the mid so we can tell between responses. */
 301         cli->mid++;
 302         if (!cli->mid)
 303                 cli->mid++;
 304         return true;
 305 }
 306
 307 /****************************************************************************
 308  Send a "direct" writeX smb to a fd.
 309 ****************************************************************************/
 310
 311 bool cli_send_smb_direct_writeX(struct cli_state *cli,
 312                                 const char *p,
 313                                 size_t extradata)
 314 {
 315         /* First length to send is the offset to the data. */
 316         size_t len = SVAL(cli->outbuf,smb_vwv11) + 4;
 317         size_t nwritten=0;
 318         ssize_t ret;
 319
 320         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 321         if (cli->fd == -1) {
 322                 return false;
 323         }
 324
 325         if (client_is_signing_on(cli)) {
 326                 DEBUG(0,("cli_send_smb_large: cannot send signed packet.\n"));
 327                 return false;
 328         }
 329
 330         while (nwritten < len) {
 331                 ret = write_socket(cli->fd,cli->outbuf+nwritten,len - nwritten);
 332                 if (ret <= 0) {
 333                         close(cli->fd);
 334                         cli->fd = -1;
 335                         cli->smb_rw_error = SMB_WRITE_ERROR;
 336                         DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
 337                                 (int)len,(int)ret, strerror(errno) ));
 338                         return false;
 339                 }
 340                 nwritten += ret;
 341         }
 342
 343         /* Now write the extra data. */
 344         nwritten=0;
 345         while (nwritten < extradata) {
 346                 ret = write_socket(cli->fd,p+nwritten,extradata - nwritten);
 347                 if (ret <= 0) {
 348                         close(cli->fd);
 349                         cli->fd = -1;
 350                         cli->smb_rw_error = SMB_WRITE_ERROR;
 351                         DEBUG(0,("Error writing %d extradata "
 352                                 "bytes to client. %d (%s)\n",
 353                                 (int)extradata,(int)ret, strerror(errno) ));
 354                         return false;
 355                 }
 356                 nwritten += ret;
 357         }
 358
 359         /* Increment the mid so we can tell between responses. */
 360         cli->mid++;
 361         if (!cli->mid)
 362                 cli->mid++;
 363         return true;
 364 }
 365
 366 /****************************************************************************
 367  Setup basics in a outgoing packet.
 368 ****************************************************************************/
 369
 370 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
 371 {
 372         uint16 flags2;
 373         cli->rap_error = 0;
 374         SIVAL(buf,smb_rcls,0);
 375         SSVAL(buf,smb_pid,cli->pid);
 376         memset(buf+smb_pidhigh, 0, 12);
 377         SSVAL(buf,smb_uid,cli->vuid);
 378         SSVAL(buf,smb_mid,cli->mid);
 379
 380         if (cli->protocol <= PROTOCOL_CORE) {
 381                 return;
 382         }
 383
 384         if (cli->case_sensitive) {
 385                 SCVAL(buf,smb_flg,0x0);
 386         } else {
 387                 /* Default setting, case insensitive. */
 388                 SCVAL(buf,smb_flg,0x8);
 389         }
 390         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 391         if (cli->capabilities & CAP_UNICODE)
 392                 flags2 |= FLAGS2_UNICODE_STRINGS;
 393         if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
 394                 flags2 |= FLAGS2_DFS_PATHNAMES;
 395         if (cli->capabilities & CAP_STATUS32)
 396                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 397         if (cli->use_spnego)
 398                 flags2 |= FLAGS2_EXTENDED_SECURITY;
 399         SSVAL(buf,smb_flg2, flags2);
 400 }
 401
 402 void cli_setup_packet(struct cli_state *cli)
 403 {
 404         cli_setup_packet_buf(cli, cli->outbuf);
 405 }
 406
 407 /****************************************************************************
 408  Setup the bcc length of the packet from a pointer to the end of the data.
 409 ****************************************************************************/
 410
 411 void cli_setup_bcc(struct cli_state *cli, void *p)
 412 {
 413         set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 414 }
 415
 416 /****************************************************************************
 417  Initialise credentials of a client structure.
 418 ****************************************************************************/
 419
 420 void cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 421 {
 422         fstrcpy(cli->domain, domain);
 423         fstrcpy(cli->user_name, username);
 424         pwd_set_cleartext(&cli->pwd, password);
 425         if (!*username) {
 426                 cli->pwd.null_pwd = true;
 427         }
 428
 429         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 430 }
 431
 432 /****************************************************************************
 433  Set the signing state (used from the command line).
 434 ****************************************************************************/
 435
 436 void cli_setup_signing_state(struct cli_state *cli, int signing_state)
 437 {
 438         if (signing_state == Undefined)
 439                 return;
 440
 441         if (signing_state == false) {
 442                 cli->sign_info.allow_smb_signing = false;
 443                 cli->sign_info.mandatory_signing = false;
 444                 return;
 445         }
 446
 447         cli->sign_info.allow_smb_signing = true;
 448
 449         if (signing_state == Required)
 450                 cli->sign_info.mandatory_signing = true;
 451 }
 452
 453 /****************************************************************************
 454  Initialise a client structure. Always returns a malloc'ed struct.
 455 ****************************************************************************/
 456
 457 struct cli_state *cli_initialise(void)
 458 {
 459         struct cli_state *cli = NULL;
 460
 461         /* Check the effective uid - make sure we are not setuid */
 462         if (is_setuid_root()) {
 463                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 464                 return NULL;
 465         }
 466
 467         cli = TALLOC_ZERO_P(NULL, struct cli_state);
 468         if (!cli) {
 469                 return NULL;
 470         }
 471
 472         cli->port = 0;
 473         cli->fd = -1;
 474         cli->cnum = -1;
 475         cli->pid = (uint16)sys_getpid();
 476         cli->mid = 1;
 477         cli->vuid = UID_FIELD_INVALID;
 478         cli->protocol = PROTOCOL_NT1;
 479         cli->timeout = 20000; /* Timeout is in milliseconds. */
 480         cli->bufsize = CLI_BUFFER_SIZE+4;
 481         cli->max_xmit = cli->bufsize;
 482         cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 483         cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
 484         cli->oplock_handler = cli_oplock_ack;
 485         cli->case_sensitive = false;
 486         cli->smb_rw_error = SMB_READ_OK;
 487
 488         cli->use_spnego = lp_client_use_spnego();
 489
 490         cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
 491
 492         /* Set the CLI_FORCE_DOSERR environment variable to test
 493            client routines using DOS errors instead of STATUS32
 494            ones.  This intended only as a temporary hack. */
 495         if (getenv("CLI_FORCE_DOSERR"))
 496                 cli->force_dos_errors = true;
 497
 498         if (lp_client_signing())
 499                 cli->sign_info.allow_smb_signing = true;
 500
 501         if (lp_client_signing() == Required)
 502                 cli->sign_info.mandatory_signing = true;
 503
 504         if (!cli->outbuf || !cli->inbuf)
 505                 goto error;
 506
 507         memset(cli->outbuf, 0, cli->bufsize);
 508         memset(cli->inbuf, 0, cli->bufsize);
 509
 510
 511 #if defined(DEVELOPER)
 512         /* just because we over-allocate, doesn't mean it's right to use it */
 513         clobber_region(FUNCTION_MACRO, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
 514         clobber_region(FUNCTION_MACRO, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
 515 #endif
 516
 517         /* initialise signing */
 518         cli_null_set_signing(cli);
 519
 520         cli->initialised = 1;
 521
 522         return cli;
 523
 524         /* Clean up after malloc() error */
 525
 526  error:
 527
 528         SAFE_FREE(cli->inbuf);
 529         SAFE_FREE(cli->outbuf);
 530         SAFE_FREE(cli);
 531         return NULL;
 532 }
 533
 534 /****************************************************************************
 535  Close all pipes open on this session.
 536 ****************************************************************************/
 537
 538 void cli_nt_pipes_close(struct cli_state *cli)
 539 {
 540         while (cli->pipe_list != NULL) {
 541                 /*
 542                  * No TALLOC_FREE here!
 543                  */
 544                 talloc_free(cli->pipe_list);
 545         }
 546 }
 547
 548 /****************************************************************************
 549  Shutdown a client structure.
 550 ****************************************************************************/
 551
 552 void cli_shutdown(struct cli_state *cli)
 553 {
 554         cli_nt_pipes_close(cli);
 555
 556         /*
 557          * tell our peer to free his resources.  Wihtout this, when an
 558          * application attempts to do a graceful shutdown and calls
 559          * smbc_free_context() to clean up all connections, some connections
 560          * can remain active on the peer end, until some (long) timeout period
 561          * later.  This tree disconnect forces the peer to clean up, since the
 562          * connection will be going away.
 563          *
 564          * Also, do not do tree disconnect when cli->smb_rw_error is SMB_DO_NOT_DO_TDIS
 565          * the only user for this so far is smbmount which passes opened connection
 566          * down to kernel's smbfs module.
 567          */
 568         if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != SMB_DO_NOT_DO_TDIS ) ) {
 569                 cli_tdis(cli);
 570         }
 571
 572         SAFE_FREE(cli->outbuf);
 573         SAFE_FREE(cli->inbuf);
 574
 575         cli_free_signing_context(cli);
 576         data_blob_free(&cli->secblob);
 577         data_blob_free(&cli->user_session_key);
 578
 579         if (cli->fd != -1) {
 580                 close(cli->fd);
 581         }
 582         cli->fd = -1;
 583         cli->smb_rw_error = SMB_READ_OK;
 584
 585         TALLOC_FREE(cli);
 586 }
 587
 588 /****************************************************************************
 589  Set socket options on a open connection.
 590 ****************************************************************************/
 591
 592 void cli_sockopt(struct cli_state *cli, const char *options)
 593 {
 594         set_socket_options(cli->fd, options);
 595 }
 596
 597 /****************************************************************************
 598  Set the PID to use for smb messages. Return the old pid.
 599 ****************************************************************************/
 600
 601 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 602 {
 603         uint16 ret = cli->pid;
 604         cli->pid = pid;
 605         return ret;
 606 }
 607
 608 /****************************************************************************
 609  Set the case sensitivity flag on the packets. Returns old state.
 610 ****************************************************************************/
 611
 612 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 613 {
 614         bool ret = cli->case_sensitive;
 615         cli->case_sensitive = case_sensitive;
 616         return ret;
 617 }
 618
 619 /****************************************************************************
 620 Send a keepalive packet to the server
 621 ****************************************************************************/
 622
 623 bool cli_send_keepalive(struct cli_state *cli)
 624 {
 625         if (cli->fd == -1) {
 626                 DEBUG(3, ("cli_send_keepalive: fd == -1\n"));
 627                 return false;
 628         }
 629         if (!send_keepalive(cli->fd)) {
 630                 close(cli->fd);
 631                 cli->fd = -1;
 632                 DEBUG(0,("Error sending keepalive packet to client.\n"));
 633                 return false;
 634         }
 635         return true;
 636 }
 637
 638 /**
 639  * @brief: Collect a echo reply
 640  * @param[in] req       The corresponding async request
 641  *
 642  * There might be more than one echo reply. This helper pulls the reply out of
 643  * the data stream. If all expected replies have arrived, declare the
 644  * async_req done.
 645  */
 646
 647 static void cli_echo_recv_helper(struct async_req *req)
 648 {
 649         struct cli_request *cli_req;
 650         uint8_t wct;
 651         uint16_t *vwv;
 652         uint16_t num_bytes;
 653         uint8_t *bytes;
 654         NTSTATUS status;
 655
 656         status = cli_pull_reply(req, &wct, &vwv, &num_bytes, &bytes);
 657         if (!NT_STATUS_IS_OK(status)) {
 658                 async_req_error(req, status);
 659                 return;
 660         }
 661
 662         cli_req = talloc_get_type_abort(req->private_data, struct cli_request);
 663
 664         if ((num_bytes != cli_req->data.echo.data.length)
 665             || (memcmp(cli_req->data.echo.data.data, bytes,
 666                        num_bytes) != 0)) {
 667                 async_req_error(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 668                 return;
 669         }
 670
 671         cli_req->data.echo.num_echos -= 1;
 672
 673         if (cli_req->data.echo.num_echos == 0) {
 674                 client_set_trans_sign_state_off(cli_req->cli, cli_req->mid);
 675                 async_req_done(req);
 676                 return;
 677         }
 678
 679         return;
 680 }
 681
 682 /**
 683  * @brief Send SMBEcho requests
 684  * @param[in] mem_ctx   The memory context to put the async_req on
 685  * @param[in] ev        The event context that will call us back
 686  * @param[in] cli       The connection to send the echo to
 687  * @param[in] num_echos How many times do we want to get the reply?
 688  * @param[in] data      The data we want to get back
 689  * @retval The async request
 690  */
 691
 692 struct async_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 693                                 struct cli_state *cli, uint16_t num_echos,
 694                                 DATA_BLOB data)
 695 {
 696         uint16_t vwv[1];
 697         uint8_t *data_copy;
 698         struct async_req *result;
 699         struct cli_request *req;
 700
 701         SSVAL(vwv, 0, num_echos);
 702
 703         data_copy = (uint8_t *)talloc_memdup(mem_ctx, data.data, data.length);
 704         if (data_copy == NULL) {
 705                 return NULL;
 706         }
 707
 708         result = cli_request_send(mem_ctx, ev, cli, SMBecho, 0, 1, vwv,
 709                                   data.length, data.data);
 710         if (result == NULL) {
 711                 TALLOC_FREE(data_copy);
 712                 return NULL;
 713         }
 714         req = talloc_get_type_abort(result->private_data, struct cli_request);
 715
 716         client_set_trans_sign_state_on(cli, req->mid);
 717
 718         req->data.echo.num_echos = num_echos;
 719         req->data.echo.data.data = talloc_move(req, &data_copy);
 720         req->data.echo.data.length = data.length;
 721
 722         req->recv_helper.fn = cli_echo_recv_helper;
 723
 724         return result;
 725 }
 726
 727 /**
 728  * Get the result out from an echo request
 729  * @param[in] req       The async_req from cli_echo_send
 730  * @retval Did the server reply correctly?
 731  */
 732
 733 NTSTATUS cli_echo_recv(struct async_req *req)
 734 {
 735         SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
 736         if (req->state == ASYNC_REQ_ERROR) {
 737                 return req->status;
 738         }
 739
 740         return NT_STATUS_OK;
 741 }
 742
 743 /**
 744  * @brief Send/Receive SMBEcho requests
 745  * @param[in] mem_ctx   The memory context to put the async_req on
 746  * @param[in] ev        The event context that will call us back
 747  * @param[in] cli       The connection to send the echo to
 748  * @param[in] num_echos How many times do we want to get the reply?
 749  * @param[in] data      The data we want to get back
 750  * @retval Did the server reply correctly?
 751  */
 752
 753 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 754 {
 755         TALLOC_CTX *frame = talloc_stackframe();
 756         struct event_context *ev;
 757         struct async_req *req;
 758         NTSTATUS status = NT_STATUS_NO_MEMORY;
 759
 760         if (cli->fd_event != NULL) {
 761                 /*
 762                  * Can't use sync call while an async call is in flight
 763                  */
 764                 cli_set_error(cli, NT_STATUS_INVALID_PARAMETER);
 765                 goto fail;
 766         }
 767
 768         ev = event_context_init(frame);
 769         if (ev == NULL) {
 770                 goto fail;
 771         }
 772
 773         req = cli_echo_send(frame, ev, cli, num_echos, data);
 774         if (req == NULL) {
 775                 goto fail;
 776         }
 777
 778         while (req->state < ASYNC_REQ_DONE) {
 779                 event_loop_once(ev);
 780         }
 781
 782         status = cli_echo_recv(req);
 783
 784  fail:
 785         TALLOC_FREE(frame);
 786         return status;
 787 }