source3/libsmb/clidfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client connect/disconnect routines
   4    Copyright (C) Andrew Tridgell                  1994-1998
   5    Copyright (C) Gerald (Jerry) Carter            2004
   6    Copyright (C) Jeremy Allison                   2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /********************************************************************
  25  Important point.
  26
  27  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  28  are not C escaped here).
  29
  30  - but if we're using POSIX paths then <pathname> may contain
  31    '/' separators, not '\\' separators. So cope with '\\' or '/'
  32    as a separator when looking at the pathname part.... JRA.
  33 ********************************************************************/
  34
  35 struct client_connection {
  36         struct client_connection *prev, *next;
  37         struct cli_state *cli;
  38         pstring mount;
  39 };
  40
  41 /* global state....globals reek! */
  42
  43 static pstring username;
  44 static pstring password;
  45 static bool use_kerberos;
  46 static bool got_pass;
  47 static int signing_state;
  48 int max_protocol = PROTOCOL_NT1;
  49
  50 static int port;
  51 static int name_type = 0x20;
  52 static bool have_ip;
  53 static struct sockaddr_storage dest_ss;
  54
  55 static struct client_connection *connections;
  56
  57 /********************************************************************
  58  Return a connection to a server.
  59 ********************************************************************/
  60
  61 static struct cli_state *do_connect( const char *server, const char *share,
  62                                      bool show_sessetup )
  63 {
  64         struct cli_state *c = NULL;
  65         struct nmb_name called, calling;
  66         const char *server_n;
  67         struct sockaddr_storage ss;
  68         pstring servicename;
  69         char *sharename;
  70         fstring newserver, newshare;
  71         NTSTATUS status;
  72
  73         /* make a copy so we don't modify the global string 'service' */
  74         pstrcpy(servicename, share);
  75         sharename = servicename;
  76         if (*sharename == '\\') {
  77                 server = sharename+2;
  78                 sharename = strchr_m(server,'\\');
  79                 if (!sharename) return NULL;
  80                 *sharename = 0;
  81                 sharename++;
  82         }
  83
  84         server_n = server;
  85
  86         zero_addr(&ss);
  87
  88         make_nmb_name(&calling, global_myname(), 0x0);
  89         make_nmb_name(&called , server, name_type);
  90
  91  again:
  92         zero_addr(&ss);
  93         if (have_ip)
  94                 ss = dest_ss;
  95
  96         /* have to open a new connection */
  97         if (!(c=cli_initialise()) || (cli_set_port(c, port) != port)) {
  98                 d_printf("Connection to %s failed\n", server_n);
  99                 return NULL;
 100         }
 101         status = cli_connect(c, server_n, &ss);
 102         if (!NT_STATUS_IS_OK(status)) {
 103                 d_printf("Connection to %s failed (Error %s)\n", server_n, nt_errstr(status));
 104                 return NULL;
 105         }
 106
 107         c->protocol = max_protocol;
 108         c->use_kerberos = use_kerberos;
 109         cli_setup_signing_state(c, signing_state);
 110
 111
 112         if (!cli_session_request(c, &calling, &called)) {
 113                 char *p;
 114                 d_printf("session request to %s failed (%s)\n",
 115                          called.name, cli_errstr(c));
 116                 cli_shutdown(c);
 117                 c = NULL;
 118                 if ((p=strchr_m(called.name, '.'))) {
 119                         *p = 0;
 120                         goto again;
 121                 }
 122                 if (strcmp(called.name, "*SMBSERVER")) {
 123                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 124                         goto again;
 125                 }
 126                 return NULL;
 127         }
 128
 129         DEBUG(4,(" session request ok\n"));
 130
 131         if (!cli_negprot(c)) {
 132                 d_printf("protocol negotiation failed\n");
 133                 cli_shutdown(c);
 134                 return NULL;
 135         }
 136
 137         if (!got_pass) {
 138                 char *pass = getpass("Password: ");
 139                 if (pass) {
 140                         pstrcpy(password, pass);
 141                         got_pass = 1;
 142                 }
 143         }
 144
 145         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 146                                                password, strlen(password),
 147                                                password, strlen(password),
 148                                                lp_workgroup()))) {
 149                 /* if a password was not supplied then try again with a null username */
 150                 if (password[0] || !username[0] || use_kerberos ||
 151                     !NT_STATUS_IS_OK(cli_session_setup(c, "", "", 0, "", 0,
 152                                                        lp_workgroup()))) {
 153                         d_printf("session setup failed: %s\n", cli_errstr(c));
 154                         if (NT_STATUS_V(cli_nt_error(c)) ==
 155                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 156                                 d_printf("did you forget to run kinit?\n");
 157                         cli_shutdown(c);
 158                         return NULL;
 159                 }
 160                 d_printf("Anonymous login successful\n");
 161         }
 162
 163         if ( show_sessetup ) {
 164                 if (*c->server_domain) {
 165                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 166                                 c->server_domain,c->server_os,c->server_type));
 167                 } else if (*c->server_os || *c->server_type){
 168                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 169                                  c->server_os,c->server_type));
 170                 }
 171         }
 172         DEBUG(4,(" session setup ok\n"));
 173
 174         /* here's the fun part....to support 'msdfs proxy' shares
 175            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 176            here before trying to connect to the original share.
 177            check_dfs_proxy() will fail if it is a normal share. */
 178
 179         if ( (c->capabilities & CAP_DFS) && cli_check_msdfs_proxy( c, sharename, newserver, newshare ) ) {
 180                 cli_shutdown(c);
 181                 return do_connect( newserver, newshare, False );
 182         }
 183
 184         /* must be a normal share */
 185
 186         if (!cli_send_tconX(c, sharename, "?????", password, strlen(password)+1)) {
 187                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 188                 cli_shutdown(c);
 189                 return NULL;
 190         }
 191
 192         DEBUG(4,(" tconx ok\n"));
 193
 194         return c;
 195 }
 196
 197 /****************************************************************************
 198 ****************************************************************************/
 199
 200 static void cli_cm_set_mntpoint( struct cli_state *c, const char *mnt )
 201 {
 202         struct client_connection *p;
 203         int i;
 204
 205         for ( p=connections,i=0; p; p=p->next,i++ ) {
 206                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 207                         break;
 208         }
 209
 210         if ( p ) {
 211                 char *name = clean_name(NULL, p->mount);
 212                 if (!name) {
 213                         return;
 214                 }
 215                 pstrcpy( p->mount, name );
 216                 TALLOC_FREE(name);
 217         }
 218 }
 219
 220 /****************************************************************************
 221 ****************************************************************************/
 222
 223 const char *cli_cm_get_mntpoint( struct cli_state *c )
 224 {
 225         struct client_connection *p;
 226         int i;
 227
 228         for ( p=connections,i=0; p; p=p->next,i++ ) {
 229                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 230                         break;
 231         }
 232
 233         if ( p )
 234                 return p->mount;
 235
 236         return NULL;
 237 }
 238
 239 /********************************************************************
 240  Add a new connection to the list
 241 ********************************************************************/
 242
 243 static struct cli_state *cli_cm_connect( const char *server,
 244                                         const char *share,
 245                                         bool show_hdr)
 246 {
 247         struct client_connection *node;
 248
 249         node = SMB_XMALLOC_P( struct client_connection );
 250
 251         node->cli = do_connect( server, share, show_hdr );
 252
 253         if ( !node->cli ) {
 254                 SAFE_FREE( node );
 255                 return NULL;
 256         }
 257
 258         DLIST_ADD( connections, node );
 259
 260         cli_cm_set_mntpoint( node->cli, "" );
 261
 262         return node->cli;
 263
 264 }
 265
 266 /********************************************************************
 267  Return a connection to a server.
 268 ********************************************************************/
 269
 270 static struct cli_state *cli_cm_find( const char *server, const char *share )
 271 {
 272         struct client_connection *p;
 273
 274         for ( p=connections; p; p=p->next ) {
 275                 if ( strequal(server, p->cli->desthost) && strequal(share,p->cli->share) )
 276                         return p->cli;
 277         }
 278
 279         return NULL;
 280 }
 281
 282 /****************************************************************************
 283  open a client connection to a \\server\share.  Set's the current *cli
 284  global variable as a side-effect (but only if the connection is successful).
 285 ****************************************************************************/
 286
 287 struct cli_state *cli_cm_open(const char *server,
 288                                 const char *share,
 289                                 bool show_hdr)
 290 {
 291         struct cli_state *c;
 292
 293         /* try to reuse an existing connection */
 294
 295         c = cli_cm_find( server, share );
 296
 297         if ( !c ) {
 298                 c = cli_cm_connect(server, share, show_hdr);
 299         }
 300
 301         return c;
 302 }
 303
 304 /****************************************************************************
 305 ****************************************************************************/
 306
 307 void cli_cm_shutdown( void )
 308 {
 309
 310         struct client_connection *p, *x;
 311
 312         for ( p=connections; p; ) {
 313                 cli_shutdown( p->cli );
 314                 x = p;
 315                 p = p->next;
 316
 317                 SAFE_FREE( x );
 318         }
 319
 320         connections = NULL;
 321         return;
 322 }
 323
 324 /****************************************************************************
 325 ****************************************************************************/
 326
 327 void cli_cm_display(void)
 328 {
 329         struct client_connection *p;
 330         int i;
 331
 332         for ( p=connections,i=0; p; p=p->next,i++ ) {
 333                 d_printf("%d:\tserver=%s, share=%s\n",
 334                         i, p->cli->desthost, p->cli->share );
 335         }
 336 }
 337
 338 /****************************************************************************
 339 ****************************************************************************/
 340
 341 void cli_cm_set_credentials( struct user_auth_info *user )
 342 {
 343         pstrcpy( username, user->username );
 344
 345         if ( user->got_pass ) {
 346                 pstrcpy( password, user->password );
 347                 got_pass = True;
 348         }
 349
 350         use_kerberos = user->use_kerberos;
 351         signing_state = user->signing_state;
 352 }
 353
 354 /****************************************************************************
 355 ****************************************************************************/
 356
 357 void cli_cm_set_port( int port_number )
 358 {
 359         port = port_number;
 360 }
 361
 362 /****************************************************************************
 363 ****************************************************************************/
 364
 365 void cli_cm_set_dest_name_type( int type )
 366 {
 367         name_type = type;
 368 }
 369
 370 /****************************************************************************
 371 ****************************************************************************/
 372
 373 void cli_cm_set_dest_ss(struct sockaddr_storage *pss)
 374 {
 375         dest_ss = *pss;
 376         have_ip = true;
 377 }
 378
 379 /**********************************************************************
 380  split a dfs path into the server, share name, and extrapath components
 381 **********************************************************************/
 382
 383 static void split_dfs_path( const char *nodepath, fstring server, fstring share, pstring extrapath )
 384 {
 385         char *p, *q;
 386         pstring path;
 387
 388         pstrcpy( path, nodepath );
 389
 390         if ( path[0] != '\\' ) {
 391                 return;
 392         }
 393
 394         p = strchr_m( path + 1, '\\' );
 395         if ( !p ) {
 396                 return;
 397         }
 398
 399         *p = '\0';
 400         p++;
 401
 402         /* Look for any extra/deep path */
 403         q = strchr_m(p, '\\');
 404         if (q != NULL) {
 405                 *q = '\0';
 406                 q++;
 407                 pstrcpy( extrapath, q );
 408         } else {
 409                 pstrcpy( extrapath, '\0' );
 410         }
 411
 412         fstrcpy( share, p );
 413         fstrcpy( server, &path[1] );
 414 }
 415
 416 /****************************************************************************
 417  Return the original path truncated at the directory component before
 418  the first wildcard character. Trust the caller to provide a NULL
 419  terminated string
 420 ****************************************************************************/
 421
 422 static void clean_path(const char *path, pstring path_out)
 423 {
 424         size_t len;
 425         char *p1, *p2, *p;
 426
 427         /* No absolute paths. */
 428         while (IS_DIRECTORY_SEP(*path)) {
 429                 path++;
 430         }
 431
 432         pstrcpy(path_out, path);
 433
 434         p1 = strchr_m(path_out, '*');
 435         p2 = strchr_m(path_out, '?');
 436
 437         if (p1 || p2) {
 438                 if (p1 && p2) {
 439                         p = MIN(p1,p2);
 440                 } else if (!p1) {
 441                         p = p2;
 442                 } else {
 443                         p = p1;
 444                 }
 445                 *p = '\0';
 446
 447                 /* Now go back to the start of this component. */
 448                 p1 = strrchr_m(path_out, '/');
 449                 p2 = strrchr_m(path_out, '\\');
 450                 p = MAX(p1,p2);
 451                 if (p) {
 452                         *p = '\0';
 453                 }
 454         }
 455
 456         /* Strip any trailing separator */
 457
 458         len = strlen(path_out);
 459         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 460                 path_out[len-1] = '\0';
 461         }
 462 }
 463
 464 /****************************************************************************
 465 ****************************************************************************/
 466
 467 static void cli_dfs_make_full_path( struct cli_state *cli,
 468                                         const char *dir,
 469                                         pstring path_out)
 470 {
 471         /* Ensure the extrapath doesn't start with a separator. */
 472         while (IS_DIRECTORY_SEP(*dir)) {
 473                 dir++;
 474         }
 475
 476         pstr_sprintf( path_out, "\\%s\\%s\\%s", cli->desthost, cli->share, dir);
 477 }
 478
 479 /********************************************************************
 480  check for dfs referral
 481 ********************************************************************/
 482
 483 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 484 {
 485         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 486
 487         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 488
 489         if ( !( (flgs2&FLAGS2_32_BIT_ERROR_CODES) && (flgs2&FLAGS2_UNICODE_STRINGS) ) )
 490                 return False;
 491
 492         if ( NT_STATUS_EQUAL( status, NT_STATUS(IVAL(cli->inbuf,smb_rcls)) ) )
 493                 return True;
 494
 495         return False;
 496 }
 497
 498 /********************************************************************
 499  get the dfs referral link
 500 ********************************************************************/
 501
 502 bool cli_dfs_get_referral( struct cli_state *cli,
 503                         const char *path,
 504                         CLIENT_DFS_REFERRAL**refs,
 505                         size_t *num_refs,
 506                         uint16 *consumed)
 507 {
 508         unsigned int data_len = 0;
 509         unsigned int param_len = 0;
 510         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 511         char param[sizeof(pstring)+2];
 512         pstring data;
 513         char *rparam=NULL, *rdata=NULL;
 514         char *p;
 515         size_t pathlen = 2*(strlen(path)+1);
 516         uint16 num_referrals;
 517         CLIENT_DFS_REFERRAL *referrals = NULL;
 518
 519         memset(param, 0, sizeof(param));
 520         SSVAL(param, 0, 0x03);  /* max referral level */
 521         p = &param[2];
 522
 523         p += clistr_push(cli, p, path, MIN(pathlen, sizeof(param)-2), STR_TERMINATE);
 524         param_len = PTR_DIFF(p, param);
 525
 526         if (!cli_send_trans(cli, SMBtrans2,
 527                 NULL,                        /* name */
 528                 -1, 0,                          /* fid, flags */
 529                 &setup, 1, 0,                   /* setup, length, max */
 530                 param, param_len, 2,            /* param, length, max */
 531                 (char *)&data,  data_len, cli->max_xmit /* data, length, max */
 532                 )) {
 533                         return False;
 534         }
 535
 536         if (!cli_receive_trans(cli, SMBtrans2,
 537                 &rparam, &param_len,
 538                 &rdata, &data_len)) {
 539                         return False;
 540         }
 541
 542         *consumed     = SVAL( rdata, 0 );
 543         num_referrals = SVAL( rdata, 2 );
 544
 545         if ( num_referrals != 0 ) {
 546                 uint16 ref_version;
 547                 uint16 ref_size;
 548                 int i;
 549                 uint16 node_offset;
 550
 551                 referrals = SMB_XMALLOC_ARRAY( CLIENT_DFS_REFERRAL, num_referrals );
 552
 553                 /* start at the referrals array */
 554
 555                 p = rdata+8;
 556                 for ( i=0; i<num_referrals; i++ ) {
 557                         ref_version = SVAL( p, 0 );
 558                         ref_size    = SVAL( p, 2 );
 559                         node_offset = SVAL( p, 16 );
 560
 561                         if ( ref_version != 3 ) {
 562                                 p += ref_size;
 563                                 continue;
 564                         }
 565
 566                         referrals[i].proximity = SVAL( p, 8 );
 567                         referrals[i].ttl       = SVAL( p, 10 );
 568
 569                         clistr_pull( cli, referrals[i].dfspath, p+node_offset,
 570                                 sizeof(referrals[i].dfspath), -1, STR_TERMINATE|STR_UNICODE );
 571
 572                         p += ref_size;
 573                 }
 574         }
 575
 576         *num_refs = num_referrals;
 577         *refs = referrals;
 578
 579         SAFE_FREE(rdata);
 580         SAFE_FREE(rparam);
 581
 582         return True;
 583 }
 584
 585
 586 /********************************************************************
 587 ********************************************************************/
 588
 589 bool cli_resolve_path( const char *mountpt,
 590                         struct cli_state *rootcli,
 591                         const char *path,
 592                         struct cli_state **targetcli,
 593                         pstring targetpath)
 594 {
 595         CLIENT_DFS_REFERRAL *refs = NULL;
 596         size_t num_refs;
 597         uint16 consumed;
 598         struct cli_state *cli_ipc;
 599         pstring dfs_path, cleanpath, extrapath;
 600         int pathlen;
 601         fstring server, share;
 602         struct cli_state *newcli;
 603         pstring newpath;
 604         pstring newmount;
 605         char *ppath, *temppath = NULL;
 606
 607         SMB_STRUCT_STAT sbuf;
 608         uint32 attributes;
 609
 610         if ( !rootcli || !path || !targetcli ) {
 611                 return False;
 612         }
 613
 614         /* Don't do anything if this is not a DFS root. */
 615
 616         if ( !rootcli->dfsroot) {
 617                 *targetcli = rootcli;
 618                 pstrcpy( targetpath, path );
 619                 return True;
 620         }
 621
 622         *targetcli = NULL;
 623
 624         /* Send a trans2_query_path_info to check for a referral. */
 625
 626         clean_path(path, cleanpath);
 627         cli_dfs_make_full_path(rootcli, cleanpath, dfs_path );
 628
 629         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes ) ) {
 630                 /* This is an ordinary path, just return it. */
 631                 *targetcli = rootcli;
 632                 pstrcpy( targetpath, path );
 633                 goto done;
 634         }
 635
 636         /* Special case where client asked for a path that does not exist */
 637
 638         if ( cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND) ) {
 639                 *targetcli = rootcli;
 640                 pstrcpy( targetpath, path );
 641                 goto done;
 642         }
 643
 644         /* We got an error, check for DFS referral. */
 645
 646         if ( !cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED))  {
 647                 return False;
 648         }
 649
 650         /* Check for the referral. */
 651
 652         if ( !(cli_ipc = cli_cm_open( rootcli->desthost, "IPC$", False )) ) {
 653                 return False;
 654         }
 655
 656         if ( !cli_dfs_get_referral(cli_ipc, dfs_path, &refs, &num_refs, &consumed)
 657                         || !num_refs ) {
 658                 return False;
 659         }
 660
 661         /* Just store the first referral for now. */
 662
 663         split_dfs_path( refs[0].dfspath, server, share, extrapath );
 664         SAFE_FREE(refs);
 665
 666         /* Make sure to recreate the original string including any wildcards. */
 667
 668         cli_dfs_make_full_path( rootcli, path, dfs_path);
 669         pathlen = strlen( dfs_path )*2;
 670         consumed = MIN(pathlen, consumed );
 671         pstrcpy( targetpath, &dfs_path[consumed/2] );
 672         dfs_path[consumed/2] = '\0';
 673
 674         /*
 675          * targetpath is now the unconsumed part of the path.
 676          * dfs_path is now the consumed part of the path (in \server\share\path format).
 677          */
 678
 679         /* Open the connection to the target server & share */
 680
 681         if ( (*targetcli = cli_cm_open(server, share, False)) == NULL ) {
 682                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 683                         server, share );
 684                 return False;
 685         }
 686
 687         if (strlen(extrapath) > 0) {
 688                 string_append(&temppath, extrapath);
 689                 string_append(&temppath, targetpath);
 690                 pstrcpy( targetpath, temppath );
 691         }
 692
 693         /* parse out the consumed mount path */
 694         /* trim off the \server\share\ */
 695
 696         ppath = dfs_path;
 697
 698         if (*ppath != '\\') {
 699                 d_printf("cli_resolve_path: dfs_path (%s) not in correct format.\n",
 700                         dfs_path );
 701                 return False;
 702         }
 703
 704         ppath++; /* Now pointing at start of server name. */
 705
 706         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 707                 return False;
 708         }
 709
 710         ppath++; /* Now pointing at start of share name. */
 711
 712         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 713                 return False;
 714         }
 715
 716         ppath++; /* Now pointing at path component. */
 717
 718         pstr_sprintf( newmount, "%s\\%s", mountpt, ppath );
 719
 720         cli_cm_set_mntpoint( *targetcli, newmount );
 721
 722         /* Check for another dfs referral, note that we are not
 723            checking for loops here. */
 724
 725         if ( !strequal( targetpath, "\\" ) &&  !strequal( targetpath, "/")) {
 726                 if ( cli_resolve_path( newmount, *targetcli, targetpath, &newcli, newpath ) ) {
 727                         /*
 728                          * When cli_resolve_path returns true here it's always
 729                          * returning the complete path in newpath, so we're done
 730                          * here.
 731                          */
 732                         *targetcli = newcli;
 733                         pstrcpy( targetpath, newpath );
 734                         return True;
 735                 }
 736         }
 737
 738   done:
 739
 740         /* If returning True ensure we return a dfs root full path. */
 741         if ( (*targetcli)->dfsroot ) {
 742                 pstrcpy(dfs_path, targetpath );
 743                 cli_dfs_make_full_path( *targetcli, dfs_path, targetpath);
 744         }
 745
 746         return True;
 747 }
 748
 749 /********************************************************************
 750 ********************************************************************/
 751
 752 bool cli_check_msdfs_proxy( struct cli_state *cli, const char *sharename,
 753                             fstring newserver, fstring newshare )
 754 {
 755         CLIENT_DFS_REFERRAL *refs = NULL;
 756         size_t num_refs;
 757         uint16 consumed;
 758         pstring fullpath;
 759         bool res;
 760         uint16 cnum;
 761         pstring newextrapath;
 762
 763         if ( !cli || !sharename )
 764                 return False;
 765
 766         cnum = cli->cnum;
 767
 768         /* special case.  never check for a referral on the IPC$ share */
 769
 770         if ( strequal( sharename, "IPC$" ) ) {
 771                 return False;
 772         }
 773
 774         /* send a trans2_query_path_info to check for a referral */
 775
 776         pstr_sprintf( fullpath, "\\%s\\%s", cli->desthost, sharename );
 777
 778         /* check for the referral */
 779
 780         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
 781                 return False;
 782         }
 783
 784         res = cli_dfs_get_referral(cli, fullpath, &refs, &num_refs, &consumed);
 785
 786         if (!cli_tdis(cli)) {
 787                 SAFE_FREE( refs );
 788                 return False;
 789         }
 790
 791         cli->cnum = cnum;
 792
 793         if (!res || !num_refs ) {
 794                 SAFE_FREE( refs );
 795                 return False;
 796         }
 797
 798         split_dfs_path( refs[0].dfspath, newserver, newshare, newextrapath );
 799
 800         /* check that this is not a self-referral */
 801
 802         if ( strequal( cli->desthost, newserver ) && strequal( sharename, newshare ) ) {
 803                 SAFE_FREE( refs );
 804                 return False;
 805         }
 806
 807         SAFE_FREE( refs );
 808
 809         return True;
 810 }