source/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24
  25 /********************************************************************
  26  Important point.
  27
  28  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  29  are not C escaped here).
  30
  31  - but if we're using POSIX paths then <pathname> may contain
  32    '/' separators, not '\\' separators. So cope with '\\' or '/'
  33    as a separator when looking at the pathname part.... JRA.
  34 ********************************************************************/
  35
  36 struct client_connection {
  37         struct client_connection *prev, *next;
  38         struct cli_state *cli;
  39         pstring mount;
  40 };
  41
  42 /* global state....globals reek! */
  43
  44 static pstring username;
  45 static pstring password;
  46 static BOOL use_kerberos;
  47 static BOOL got_pass;
  48 static int signing_state;
  49 int max_protocol = PROTOCOL_NT1;
  50
  51 static int port;
  52 static int name_type = 0x20;
  53 static BOOL have_ip;
  54 static struct in_addr dest_ip;
  55
  56 static struct client_connection *connections;
  57
  58 /********************************************************************
  59  Return a connection to a server.
  60 ********************************************************************/
  61
  62 static struct cli_state *do_connect( const char *server, const char *share,
  63                                      BOOL show_sessetup )
  64 {
  65         struct cli_state *c = NULL;
  66         struct nmb_name called, calling;
  67         const char *server_n;
  68         struct in_addr ip;
  69         pstring servicename;
  70         char *sharename;
  71         fstring newserver, newshare;
  72         NTSTATUS status;
  73
  74         /* make a copy so we don't modify the global string 'service' */
  75         pstrcpy(servicename, share);
  76         sharename = servicename;
  77         if (*sharename == '\\') {
  78                 server = sharename+2;
  79                 sharename = strchr_m(server,'\\');
  80                 if (!sharename) return NULL;
  81                 *sharename = 0;
  82                 sharename++;
  83         }
  84
  85         server_n = server;
  86
  87         zero_ip(&ip);
  88
  89         make_nmb_name(&calling, global_myname(), 0x0);
  90         make_nmb_name(&called , server, name_type);
  91
  92  again:
  93         zero_ip(&ip);
  94         if (have_ip)
  95                 ip = dest_ip;
  96
  97         /* have to open a new connection */
  98         if (!(c=cli_initialise()) || (cli_set_port(c, port) != port)) {
  99                 d_printf("Connection to %s failed\n", server_n);
 100                 return NULL;
 101         }
 102         status = cli_connect(c, server_n, &ip);
 103         if (!NT_STATUS_IS_OK(status)) {
 104                 d_printf("Connection to %s failed (Error %s)\n", server_n, nt_errstr(status));
 105                 return NULL;
 106         }
 107
 108         c->protocol = max_protocol;
 109         c->use_kerberos = use_kerberos;
 110         cli_setup_signing_state(c, signing_state);
 111
 112
 113         if (!cli_session_request(c, &calling, &called)) {
 114                 char *p;
 115                 d_printf("session request to %s failed (%s)\n",
 116                          called.name, cli_errstr(c));
 117                 cli_shutdown(c);
 118                 c = NULL;
 119                 if ((p=strchr_m(called.name, '.'))) {
 120                         *p = 0;
 121                         goto again;
 122                 }
 123                 if (strcmp(called.name, "*SMBSERVER")) {
 124                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 125                         goto again;
 126                 }
 127                 return NULL;
 128         }
 129
 130         DEBUG(4,(" session request ok\n"));
 131
 132         if (!cli_negprot(c)) {
 133                 d_printf("protocol negotiation failed\n");
 134                 cli_shutdown(c);
 135                 return NULL;
 136         }
 137
 138         if (!got_pass) {
 139                 char *pass = getpass("Password: ");
 140                 if (pass) {
 141                         pstrcpy(password, pass);
 142                         got_pass = 1;
 143                 }
 144         }
 145
 146         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 147                                                password, strlen(password),
 148                                                password, strlen(password),
 149                                                lp_workgroup()))) {
 150                 /* if a password was not supplied then try again with a null username */
 151                 if (password[0] || !username[0] || use_kerberos ||
 152                     !NT_STATUS_IS_OK(cli_session_setup(c, "", "", 0, "", 0,
 153                                                        lp_workgroup()))) {
 154                         d_printf("session setup failed: %s\n", cli_errstr(c));
 155                         if (NT_STATUS_V(cli_nt_error(c)) ==
 156                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 157                                 d_printf("did you forget to run kinit?\n");
 158                         cli_shutdown(c);
 159                         return NULL;
 160                 }
 161                 d_printf("Anonymous login successful\n");
 162         }
 163
 164         if ( show_sessetup ) {
 165                 if (*c->server_domain) {
 166                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 167                                 c->server_domain,c->server_os,c->server_type));
 168                 } else if (*c->server_os || *c->server_type){
 169                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 170                                  c->server_os,c->server_type));
 171                 }
 172         }
 173         DEBUG(4,(" session setup ok\n"));
 174
 175         /* here's the fun part....to support 'msdfs proxy' shares
 176            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 177            here before trying to connect to the original share.
 178            check_dfs_proxy() will fail if it is a normal share. */
 179
 180         if ( (c->capabilities & CAP_DFS) && cli_check_msdfs_proxy( c, sharename, newserver, newshare ) ) {
 181                 cli_shutdown(c);
 182                 return do_connect( newserver, newshare, False );
 183         }
 184
 185         /* must be a normal share */
 186
 187         if (!cli_send_tconX(c, sharename, "?????", password, strlen(password)+1)) {
 188                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 189                 cli_shutdown(c);
 190                 return NULL;
 191         }
 192
 193         DEBUG(4,(" tconx ok\n"));
 194
 195         return c;
 196 }
 197
 198 /****************************************************************************
 199 ****************************************************************************/
 200
 201 static void cli_cm_set_mntpoint( struct cli_state *c, const char *mnt )
 202 {
 203         struct client_connection *p;
 204         int i;
 205
 206         for ( p=connections,i=0; p; p=p->next,i++ ) {
 207                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 208                         break;
 209         }
 210
 211         if ( p ) {
 212                 pstrcpy( p->mount, mnt );
 213                 clean_name(p->mount);
 214         }
 215 }
 216
 217 /****************************************************************************
 218 ****************************************************************************/
 219
 220 const char *cli_cm_get_mntpoint( struct cli_state *c )
 221 {
 222         struct client_connection *p;
 223         int i;
 224
 225         for ( p=connections,i=0; p; p=p->next,i++ ) {
 226                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 227                         break;
 228         }
 229
 230         if ( p )
 231                 return p->mount;
 232
 233         return NULL;
 234 }
 235
 236 /********************************************************************
 237  Add a new connection to the list
 238 ********************************************************************/
 239
 240 static struct cli_state *cli_cm_connect( const char *server,
 241                                         const char *share,
 242                                         BOOL show_hdr)
 243 {
 244         struct client_connection *node;
 245
 246         node = SMB_XMALLOC_P( struct client_connection );
 247
 248         node->cli = do_connect( server, share, show_hdr );
 249
 250         if ( !node->cli ) {
 251                 SAFE_FREE( node );
 252                 return NULL;
 253         }
 254
 255         DLIST_ADD( connections, node );
 256
 257         cli_cm_set_mntpoint( node->cli, "" );
 258
 259         return node->cli;
 260
 261 }
 262
 263 /********************************************************************
 264  Return a connection to a server.
 265 ********************************************************************/
 266
 267 static struct cli_state *cli_cm_find( const char *server, const char *share )
 268 {
 269         struct client_connection *p;
 270
 271         for ( p=connections; p; p=p->next ) {
 272                 if ( strequal(server, p->cli->desthost) && strequal(share,p->cli->share) )
 273                         return p->cli;
 274         }
 275
 276         return NULL;
 277 }
 278
 279 /****************************************************************************
 280  open a client connection to a \\server\share.  Set's the current *cli
 281  global variable as a side-effect (but only if the connection is successful).
 282 ****************************************************************************/
 283
 284 struct cli_state *cli_cm_open(const char *server,
 285                                 const char *share,
 286                                 BOOL show_hdr)
 287 {
 288         struct cli_state *c;
 289
 290         /* try to reuse an existing connection */
 291
 292         c = cli_cm_find( server, share );
 293
 294         if ( !c ) {
 295                 c = cli_cm_connect(server, share, show_hdr);
 296         }
 297
 298         return c;
 299 }
 300
 301 /****************************************************************************
 302 ****************************************************************************/
 303
 304 void cli_cm_shutdown( void )
 305 {
 306
 307         struct client_connection *p, *x;
 308
 309         for ( p=connections; p; ) {
 310                 cli_shutdown( p->cli );
 311                 x = p;
 312                 p = p->next;
 313
 314                 SAFE_FREE( x );
 315         }
 316
 317         connections = NULL;
 318         return;
 319 }
 320
 321 /****************************************************************************
 322 ****************************************************************************/
 323
 324 void cli_cm_display(void)
 325 {
 326         struct client_connection *p;
 327         int i;
 328
 329         for ( p=connections,i=0; p; p=p->next,i++ ) {
 330                 d_printf("%d:\tserver=%s, share=%s\n",
 331                         i, p->cli->desthost, p->cli->share );
 332         }
 333 }
 334
 335 /****************************************************************************
 336 ****************************************************************************/
 337
 338 void cli_cm_set_credentials( struct user_auth_info *user )
 339 {
 340         pstrcpy( username, user->username );
 341
 342         if ( user->got_pass ) {
 343                 pstrcpy( password, user->password );
 344                 got_pass = True;
 345         }
 346
 347         use_kerberos = user->use_kerberos;
 348         signing_state = user->signing_state;
 349 }
 350
 351 /****************************************************************************
 352 ****************************************************************************/
 353
 354 void cli_cm_set_port( int port_number )
 355 {
 356         port = port_number;
 357 }
 358
 359 /****************************************************************************
 360 ****************************************************************************/
 361
 362 void cli_cm_set_dest_name_type( int type )
 363 {
 364         name_type = type;
 365 }
 366
 367 /****************************************************************************
 368 ****************************************************************************/
 369
 370 void cli_cm_set_dest_ip(struct in_addr ip )
 371 {
 372         dest_ip = ip;
 373         have_ip = True;
 374 }
 375
 376 /**********************************************************************
 377  split a dfs path into the server, share name, and extrapath components
 378 **********************************************************************/
 379
 380 static void split_dfs_path( const char *nodepath, fstring server, fstring share, pstring extrapath )
 381 {
 382         char *p, *q;
 383         pstring path;
 384
 385         pstrcpy( path, nodepath );
 386
 387         if ( path[0] != '\\' ) {
 388                 return;
 389         }
 390
 391         p = strchr_m( path + 1, '\\' );
 392         if ( !p ) {
 393                 return;
 394         }
 395
 396         *p = '\0';
 397         p++;
 398
 399         /* Look for any extra/deep path */
 400         q = strchr_m(p, '\\');
 401         if (q != NULL) {
 402                 *q = '\0';
 403                 q++;
 404                 pstrcpy( extrapath, q );
 405         } else {
 406                 pstrcpy( extrapath, '\0' );
 407         }
 408
 409         fstrcpy( share, p );
 410         fstrcpy( server, &path[1] );
 411 }
 412
 413 /****************************************************************************
 414  Return the original path truncated at the directory component before
 415  the first wildcard character. Trust the caller to provide a NULL
 416  terminated string
 417 ****************************************************************************/
 418
 419 static void clean_path(const char *path, pstring path_out)
 420 {
 421         size_t len;
 422         char *p1, *p2, *p;
 423
 424         /* No absolute paths. */
 425         while (IS_DIRECTORY_SEP(*path)) {
 426                 path++;
 427         }
 428
 429         pstrcpy(path_out, path);
 430
 431         p1 = strchr_m(path_out, '*');
 432         p2 = strchr_m(path_out, '?');
 433
 434         if (p1 || p2) {
 435                 if (p1 && p2) {
 436                         p = MIN(p1,p2);
 437                 } else if (!p1) {
 438                         p = p2;
 439                 } else {
 440                         p = p1;
 441                 }
 442                 *p = '\0';
 443
 444                 /* Now go back to the start of this component. */
 445                 p1 = strrchr_m(path_out, '/');
 446                 p2 = strrchr_m(path_out, '\\');
 447                 p = MAX(p1,p2);
 448                 if (p) {
 449                         *p = '\0';
 450                 }
 451         }
 452
 453         /* Strip any trailing separator */
 454
 455         len = strlen(path_out);
 456         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 457                 path_out[len-1] = '\0';
 458         }
 459 }
 460
 461 /****************************************************************************
 462 ****************************************************************************/
 463
 464 static void cli_dfs_make_full_path( struct cli_state *cli,
 465                                         const char *dir,
 466                                         pstring path_out)
 467 {
 468         /* Ensure the extrapath doesn't start with a separator. */
 469         while (IS_DIRECTORY_SEP(*dir)) {
 470                 dir++;
 471         }
 472
 473         pstr_sprintf( path_out, "\\%s\\%s\\%s", cli->desthost, cli->share, dir);
 474 }
 475
 476 /********************************************************************
 477  check for dfs referral
 478 ********************************************************************/
 479
 480 static BOOL cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 481 {
 482         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 483
 484         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 485
 486         if ( !( (flgs2&FLAGS2_32_BIT_ERROR_CODES) && (flgs2&FLAGS2_UNICODE_STRINGS) ) )
 487                 return False;
 488
 489         if ( NT_STATUS_EQUAL( status, NT_STATUS(IVAL(cli->inbuf,smb_rcls)) ) )
 490                 return True;
 491
 492         return False;
 493 }
 494
 495 /********************************************************************
 496  get the dfs referral link
 497 ********************************************************************/
 498
 499 BOOL cli_dfs_get_referral( struct cli_state *cli,
 500                         const char *path,
 501                         CLIENT_DFS_REFERRAL**refs,
 502                         size_t *num_refs,
 503                         uint16 *consumed)
 504 {
 505         unsigned int data_len = 0;
 506         unsigned int param_len = 0;
 507         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 508         char param[sizeof(pstring)+2];
 509         pstring data;
 510         char *rparam=NULL, *rdata=NULL;
 511         char *p;
 512         size_t pathlen = 2*(strlen(path)+1);
 513         uint16 num_referrals;
 514         CLIENT_DFS_REFERRAL *referrals = NULL;
 515
 516         memset(param, 0, sizeof(param));
 517         SSVAL(param, 0, 0x03);  /* max referral level */
 518         p = &param[2];
 519
 520         p += clistr_push(cli, p, path, MIN(pathlen, sizeof(param)-2), STR_TERMINATE);
 521         param_len = PTR_DIFF(p, param);
 522
 523         if (!cli_send_trans(cli, SMBtrans2,
 524                 NULL,                        /* name */
 525                 -1, 0,                          /* fid, flags */
 526                 &setup, 1, 0,                   /* setup, length, max */
 527                 param, param_len, 2,            /* param, length, max */
 528                 (char *)&data,  data_len, cli->max_xmit /* data, length, max */
 529                 )) {
 530                         return False;
 531         }
 532
 533         if (!cli_receive_trans(cli, SMBtrans2,
 534                 &rparam, &param_len,
 535                 &rdata, &data_len)) {
 536                         return False;
 537         }
 538
 539         *consumed     = SVAL( rdata, 0 );
 540         num_referrals = SVAL( rdata, 2 );
 541
 542         if ( num_referrals != 0 ) {
 543                 uint16 ref_version;
 544                 uint16 ref_size;
 545                 int i;
 546                 uint16 node_offset;
 547
 548                 referrals = SMB_XMALLOC_ARRAY( CLIENT_DFS_REFERRAL, num_referrals );
 549
 550                 /* start at the referrals array */
 551
 552                 p = rdata+8;
 553                 for ( i=0; i<num_referrals; i++ ) {
 554                         ref_version = SVAL( p, 0 );
 555                         ref_size    = SVAL( p, 2 );
 556                         node_offset = SVAL( p, 16 );
 557
 558                         if ( ref_version != 3 ) {
 559                                 p += ref_size;
 560                                 continue;
 561                         }
 562
 563                         referrals[i].proximity = SVAL( p, 8 );
 564                         referrals[i].ttl       = SVAL( p, 10 );
 565
 566                         clistr_pull( cli, referrals[i].dfspath, p+node_offset,
 567                                 sizeof(referrals[i].dfspath), -1, STR_TERMINATE|STR_UNICODE );
 568
 569                         p += ref_size;
 570                 }
 571         }
 572
 573         *num_refs = num_referrals;
 574         *refs = referrals;
 575
 576         SAFE_FREE(rdata);
 577         SAFE_FREE(rparam);
 578
 579         return True;
 580 }
 581
 582
 583 /********************************************************************
 584 ********************************************************************/
 585
 586 BOOL cli_resolve_path( const char *mountpt,
 587                         struct cli_state *rootcli,
 588                         const char *path,
 589                         struct cli_state **targetcli,
 590                         pstring targetpath)
 591 {
 592         CLIENT_DFS_REFERRAL *refs = NULL;
 593         size_t num_refs;
 594         uint16 consumed;
 595         struct cli_state *cli_ipc;
 596         pstring dfs_path, cleanpath, extrapath;
 597         int pathlen;
 598         fstring server, share;
 599         struct cli_state *newcli;
 600         pstring newpath;
 601         pstring newmount;
 602         char *ppath, *temppath = NULL;
 603
 604         SMB_STRUCT_STAT sbuf;
 605         uint32 attributes;
 606
 607         if ( !rootcli || !path || !targetcli ) {
 608                 return False;
 609         }
 610
 611         /* Don't do anything if this is not a DFS root. */
 612
 613         if ( !rootcli->dfsroot) {
 614                 *targetcli = rootcli;
 615                 pstrcpy( targetpath, path );
 616                 return True;
 617         }
 618
 619         *targetcli = NULL;
 620
 621         /* Send a trans2_query_path_info to check for a referral. */
 622
 623         clean_path(path, cleanpath);
 624         cli_dfs_make_full_path(rootcli, cleanpath, dfs_path );
 625
 626         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes ) ) {
 627                 /* This is an ordinary path, just return it. */
 628                 *targetcli = rootcli;
 629                 pstrcpy( targetpath, path );
 630                 goto done;
 631         }
 632
 633         /* Special case where client asked for a path that does not exist */
 634
 635         if ( cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND) ) {
 636                 *targetcli = rootcli;
 637                 pstrcpy( targetpath, path );
 638                 goto done;
 639         }
 640
 641         /* We got an error, check for DFS referral. */
 642
 643         if ( !cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED))  {
 644                 return False;
 645         }
 646
 647         /* Check for the referral. */
 648
 649         if ( !(cli_ipc = cli_cm_open( rootcli->desthost, "IPC$", False )) ) {
 650                 return False;
 651         }
 652
 653         if ( !cli_dfs_get_referral(cli_ipc, dfs_path, &refs, &num_refs, &consumed)
 654                         || !num_refs ) {
 655                 return False;
 656         }
 657
 658         /* Just store the first referral for now. */
 659
 660         split_dfs_path( refs[0].dfspath, server, share, extrapath );
 661         SAFE_FREE(refs);
 662
 663         /* Make sure to recreate the original string including any wildcards. */
 664
 665         cli_dfs_make_full_path( rootcli, path, dfs_path);
 666         pathlen = strlen( dfs_path )*2;
 667         consumed = MIN(pathlen, consumed );
 668         pstrcpy( targetpath, &dfs_path[consumed/2] );
 669         dfs_path[consumed/2] = '\0';
 670
 671         /*
 672          * targetpath is now the unconsumed part of the path.
 673          * dfs_path is now the consumed part of the path (in \server\share\path format).
 674          */
 675
 676         /* Open the connection to the target server & share */
 677
 678         if ( (*targetcli = cli_cm_open(server, share, False)) == NULL ) {
 679                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 680                         server, share );
 681                 return False;
 682         }
 683
 684         if (strlen(extrapath) > 0) {
 685                 string_append(&temppath, extrapath);
 686                 string_append(&temppath, targetpath);
 687                 pstrcpy( targetpath, temppath );
 688         }
 689
 690         /* parse out the consumed mount path */
 691         /* trim off the \server\share\ */
 692
 693         ppath = dfs_path;
 694
 695         if (*ppath != '\\') {
 696                 d_printf("cli_resolve_path: dfs_path (%s) not in correct format.\n",
 697                         dfs_path );
 698                 return False;
 699         }
 700
 701         ppath++; /* Now pointing at start of server name. */
 702
 703         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 704                 return False;
 705         }
 706
 707         ppath++; /* Now pointing at start of share name. */
 708
 709         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 710                 return False;
 711         }
 712
 713         ppath++; /* Now pointing at path component. */
 714
 715         pstr_sprintf( newmount, "%s\\%s", mountpt, ppath );
 716
 717         cli_cm_set_mntpoint( *targetcli, newmount );
 718
 719         /* Check for another dfs referral, note that we are not
 720            checking for loops here. */
 721
 722         if ( !strequal( targetpath, "\\" ) &&  !strequal( targetpath, "/")) {
 723                 if ( cli_resolve_path( newmount, *targetcli, targetpath, &newcli, newpath ) ) {
 724                         /*
 725                          * When cli_resolve_path returns true here it's always
 726                          * returning the complete path in newpath, so we're done
 727                          * here.
 728                          */
 729                         *targetcli = newcli;
 730                         pstrcpy( targetpath, newpath );
 731                         return True;
 732                 }
 733         }
 734
 735   done:
 736
 737         /* If returning True ensure we return a dfs root full path. */
 738         if ( (*targetcli)->dfsroot ) {
 739                 pstrcpy(dfs_path, targetpath );
 740                 cli_dfs_make_full_path( *targetcli, dfs_path, targetpath);
 741         }
 742
 743         return True;
 744 }
 745
 746 /********************************************************************
 747 ********************************************************************/
 748
 749 BOOL cli_check_msdfs_proxy( struct cli_state *cli, const char *sharename,
 750                             fstring newserver, fstring newshare )
 751 {
 752         CLIENT_DFS_REFERRAL *refs = NULL;
 753         size_t num_refs;
 754         uint16 consumed;
 755         pstring fullpath;
 756         BOOL res;
 757         uint16 cnum;
 758         pstring newextrapath;
 759
 760         if ( !cli || !sharename )
 761                 return False;
 762
 763         cnum = cli->cnum;
 764
 765         /* special case.  never check for a referral on the IPC$ share */
 766
 767         if ( strequal( sharename, "IPC$" ) ) {
 768                 return False;
 769         }
 770
 771         /* send a trans2_query_path_info to check for a referral */
 772
 773         pstr_sprintf( fullpath, "\\%s\\%s", cli->desthost, sharename );
 774
 775         /* check for the referral */
 776
 777         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
 778                 return False;
 779         }
 780
 781         res = cli_dfs_get_referral(cli, fullpath, &refs, &num_refs, &consumed);
 782
 783         if (!cli_tdis(cli)) {
 784                 SAFE_FREE( refs );
 785                 return False;
 786         }
 787
 788         cli->cnum = cnum;
 789
 790         if (!res || !num_refs ) {
 791                 SAFE_FREE( refs );
 792                 return False;
 793         }
 794
 795         split_dfs_path( refs[0].dfspath, newserver, newshare, newextrapath );
 796
 797         /* check that this is not a self-referral */
 798
 799         if ( strequal( cli->desthost, newserver ) && strequal( sharename, newshare ) ) {
 800                 SAFE_FREE( refs );
 801                 return False;
 802         }
 803
 804         SAFE_FREE( refs );
 805
 806         return True;
 807 }