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