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 in_addr dest_ip;
  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 in_addr ip;
  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_ip_v4(&ip);
  87
  88         make_nmb_name(&calling, global_myname(), 0x0);
  89         make_nmb_name(&called , server, name_type);
  90
  91  again:
  92         zero_ip_v4(&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                 d_printf("Connection to %s failed\n", server_n);
  99                 return NULL;
 100         }
 101         status = cli_connect(c, server_n, &ip);
 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                 pstrcpy( p->mount, mnt );
 212                 clean_name(p->mount);
 213         }
 214 }
 215
 216 /****************************************************************************
 217 ****************************************************************************/
 218
 219 const char *cli_cm_get_mntpoint( struct cli_state *c )
 220 {
 221         struct client_connection *p;
 222         int i;
 223
 224         for ( p=connections,i=0; p; p=p->next,i++ ) {
 225                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 226                         break;
 227         }
 228
 229         if ( p )
 230                 return p->mount;
 231
 232         return NULL;
 233 }
 234
 235 /********************************************************************
 236  Add a new connection to the list
 237 ********************************************************************/
 238
 239 static struct cli_state *cli_cm_connect( const char *server,
 240                                         const char *share,
 241                                         BOOL show_hdr)
 242 {
 243         struct client_connection *node;
 244
 245         node = SMB_XMALLOC_P( struct client_connection );
 246
 247         node->cli = do_connect( server, share, show_hdr );
 248
 249         if ( !node->cli ) {
 250                 SAFE_FREE( node );
 251                 return NULL;
 252         }
 253
 254         DLIST_ADD( connections, node );
 255
 256         cli_cm_set_mntpoint( node->cli, "" );
 257
 258         return node->cli;
 259
 260 }
 261
 262 /********************************************************************
 263  Return a connection to a server.
 264 ********************************************************************/
 265
 266 static struct cli_state *cli_cm_find( const char *server, const char *share )
 267 {
 268         struct client_connection *p;
 269
 270         for ( p=connections; p; p=p->next ) {
 271                 if ( strequal(server, p->cli->desthost) && strequal(share,p->cli->share) )
 272                         return p->cli;
 273         }
 274
 275         return NULL;
 276 }
 277
 278 /****************************************************************************
 279  open a client connection to a \\server\share.  Set's the current *cli
 280  global variable as a side-effect (but only if the connection is successful).
 281 ****************************************************************************/
 282
 283 struct cli_state *cli_cm_open(const char *server,
 284                                 const char *share,
 285                                 BOOL show_hdr)
 286 {
 287         struct cli_state *c;
 288
 289         /* try to reuse an existing connection */
 290
 291         c = cli_cm_find( server, share );
 292
 293         if ( !c ) {
 294                 c = cli_cm_connect(server, share, show_hdr);
 295         }
 296
 297         return c;
 298 }
 299
 300 /****************************************************************************
 301 ****************************************************************************/
 302
 303 void cli_cm_shutdown( void )
 304 {
 305
 306         struct client_connection *p, *x;
 307
 308         for ( p=connections; p; ) {
 309                 cli_shutdown( p->cli );
 310                 x = p;
 311                 p = p->next;
 312
 313                 SAFE_FREE( x );
 314         }
 315
 316         connections = NULL;
 317         return;
 318 }
 319
 320 /****************************************************************************
 321 ****************************************************************************/
 322
 323 void cli_cm_display(void)
 324 {
 325         struct client_connection *p;
 326         int i;
 327
 328         for ( p=connections,i=0; p; p=p->next,i++ ) {
 329                 d_printf("%d:\tserver=%s, share=%s\n",
 330                         i, p->cli->desthost, p->cli->share );
 331         }
 332 }
 333
 334 /****************************************************************************
 335 ****************************************************************************/
 336
 337 void cli_cm_set_credentials( struct user_auth_info *user )
 338 {
 339         pstrcpy( username, user->username );
 340
 341         if ( user->got_pass ) {
 342                 pstrcpy( password, user->password );
 343                 got_pass = True;
 344         }
 345
 346         use_kerberos = user->use_kerberos;
 347         signing_state = user->signing_state;
 348 }
 349
 350 /****************************************************************************
 351 ****************************************************************************/
 352
 353 void cli_cm_set_port( int port_number )
 354 {
 355         port = port_number;
 356 }
 357
 358 /****************************************************************************
 359 ****************************************************************************/
 360
 361 void cli_cm_set_dest_name_type( int type )
 362 {
 363         name_type = type;
 364 }
 365
 366 /****************************************************************************
 367 ****************************************************************************/
 368
 369 void cli_cm_set_dest_ip(struct in_addr ip )
 370 {
 371         dest_ip = ip;
 372         have_ip = True;
 373 }
 374
 375 /**********************************************************************
 376  split a dfs path into the server, share name, and extrapath components
 377 **********************************************************************/
 378
 379 static void split_dfs_path( const char *nodepath, fstring server, fstring share, pstring extrapath )
 380 {
 381         char *p, *q;
 382         pstring path;
 383
 384         pstrcpy( path, nodepath );
 385
 386         if ( path[0] != '\\' ) {
 387                 return;
 388         }
 389
 390         p = strchr_m( path + 1, '\\' );
 391         if ( !p ) {
 392                 return;
 393         }
 394
 395         *p = '\0';
 396         p++;
 397
 398         /* Look for any extra/deep path */
 399         q = strchr_m(p, '\\');
 400         if (q != NULL) {
 401                 *q = '\0';
 402                 q++;
 403                 pstrcpy( extrapath, q );
 404         } else {
 405                 pstrcpy( extrapath, '\0' );
 406         }
 407
 408         fstrcpy( share, p );
 409         fstrcpy( server, &path[1] );
 410 }
 411
 412 /****************************************************************************
 413  Return the original path truncated at the directory component before
 414  the first wildcard character. Trust the caller to provide a NULL
 415  terminated string
 416 ****************************************************************************/
 417
 418 static void clean_path(const char *path, pstring path_out)
 419 {
 420         size_t len;
 421         char *p1, *p2, *p;
 422
 423         /* No absolute paths. */
 424         while (IS_DIRECTORY_SEP(*path)) {
 425                 path++;
 426         }
 427
 428         pstrcpy(path_out, path);
 429
 430         p1 = strchr_m(path_out, '*');
 431         p2 = strchr_m(path_out, '?');
 432
 433         if (p1 || p2) {
 434                 if (p1 && p2) {
 435                         p = MIN(p1,p2);
 436                 } else if (!p1) {
 437                         p = p2;
 438                 } else {
 439                         p = p1;
 440                 }
 441                 *p = '\0';
 442
 443                 /* Now go back to the start of this component. */
 444                 p1 = strrchr_m(path_out, '/');
 445                 p2 = strrchr_m(path_out, '\\');
 446                 p = MAX(p1,p2);
 447                 if (p) {
 448                         *p = '\0';
 449                 }
 450         }
 451
 452         /* Strip any trailing separator */
 453
 454         len = strlen(path_out);
 455         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 456                 path_out[len-1] = '\0';
 457         }
 458 }
 459
 460 /****************************************************************************
 461 ****************************************************************************/
 462
 463 static void cli_dfs_make_full_path( struct cli_state *cli,
 464                                         const char *dir,
 465                                         pstring path_out)
 466 {
 467         /* Ensure the extrapath doesn't start with a separator. */
 468         while (IS_DIRECTORY_SEP(*dir)) {
 469                 dir++;
 470         }
 471
 472         pstr_sprintf( path_out, "\\%s\\%s\\%s", cli->desthost, cli->share, dir);
 473 }
 474
 475 /********************************************************************
 476  check for dfs referral
 477 ********************************************************************/
 478
 479 static BOOL cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 480 {
 481         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 482
 483         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 484
 485         if ( !( (flgs2&FLAGS2_32_BIT_ERROR_CODES) && (flgs2&FLAGS2_UNICODE_STRINGS) ) )
 486                 return False;
 487
 488         if ( NT_STATUS_EQUAL( status, NT_STATUS(IVAL(cli->inbuf,smb_rcls)) ) )
 489                 return True;
 490
 491         return False;
 492 }
 493
 494 /********************************************************************
 495  get the dfs referral link
 496 ********************************************************************/
 497
 498 BOOL cli_dfs_get_referral( struct cli_state *cli,
 499                         const char *path,
 500                         CLIENT_DFS_REFERRAL**refs,
 501                         size_t *num_refs,
 502                         uint16 *consumed)
 503 {
 504         unsigned int data_len = 0;
 505         unsigned int param_len = 0;
 506         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 507         char param[sizeof(pstring)+2];
 508         pstring data;
 509         char *rparam=NULL, *rdata=NULL;
 510         char *p;
 511         size_t pathlen = 2*(strlen(path)+1);
 512         uint16 num_referrals;
 513         CLIENT_DFS_REFERRAL *referrals = NULL;
 514
 515         memset(param, 0, sizeof(param));
 516         SSVAL(param, 0, 0x03);  /* max referral level */
 517         p = &param[2];
 518
 519         p += clistr_push(cli, p, path, MIN(pathlen, sizeof(param)-2), STR_TERMINATE);
 520         param_len = PTR_DIFF(p, param);
 521
 522         if (!cli_send_trans(cli, SMBtrans2,
 523                 NULL,                        /* name */
 524                 -1, 0,                          /* fid, flags */
 525                 &setup, 1, 0,                   /* setup, length, max */
 526                 param, param_len, 2,            /* param, length, max */
 527                 (char *)&data,  data_len, cli->max_xmit /* data, length, max */
 528                 )) {
 529                         return False;
 530         }
 531
 532         if (!cli_receive_trans(cli, SMBtrans2,
 533                 &rparam, &param_len,
 534                 &rdata, &data_len)) {
 535                         return False;
 536         }
 537
 538         *consumed     = SVAL( rdata, 0 );
 539         num_referrals = SVAL( rdata, 2 );
 540
 541         if ( num_referrals != 0 ) {
 542                 uint16 ref_version;
 543                 uint16 ref_size;
 544                 int i;
 545                 uint16 node_offset;
 546
 547                 referrals = SMB_XMALLOC_ARRAY( CLIENT_DFS_REFERRAL, num_referrals );
 548
 549                 /* start at the referrals array */
 550
 551                 p = rdata+8;
 552                 for ( i=0; i<num_referrals; i++ ) {
 553                         ref_version = SVAL( p, 0 );
 554                         ref_size    = SVAL( p, 2 );
 555                         node_offset = SVAL( p, 16 );
 556
 557                         if ( ref_version != 3 ) {
 558                                 p += ref_size;
 559                                 continue;
 560                         }
 561
 562                         referrals[i].proximity = SVAL( p, 8 );
 563                         referrals[i].ttl       = SVAL( p, 10 );
 564
 565                         clistr_pull( cli, referrals[i].dfspath, p+node_offset,
 566                                 sizeof(referrals[i].dfspath), -1, STR_TERMINATE|STR_UNICODE );
 567
 568                         p += ref_size;
 569                 }
 570         }
 571
 572         *num_refs = num_referrals;
 573         *refs = referrals;
 574
 575         SAFE_FREE(rdata);
 576         SAFE_FREE(rparam);
 577
 578         return True;
 579 }
 580
 581
 582 /********************************************************************
 583 ********************************************************************/
 584
 585 BOOL cli_resolve_path( const char *mountpt,
 586                         struct cli_state *rootcli,
 587                         const char *path,
 588                         struct cli_state **targetcli,
 589                         pstring targetpath)
 590 {
 591         CLIENT_DFS_REFERRAL *refs = NULL;
 592         size_t num_refs;
 593         uint16 consumed;
 594         struct cli_state *cli_ipc;
 595         pstring dfs_path, cleanpath, extrapath;
 596         int pathlen;
 597         fstring server, share;
 598         struct cli_state *newcli;
 599         pstring newpath;
 600         pstring newmount;
 601         char *ppath, *temppath = NULL;
 602
 603         SMB_STRUCT_STAT sbuf;
 604         uint32 attributes;
 605
 606         if ( !rootcli || !path || !targetcli ) {
 607                 return False;
 608         }
 609
 610         /* Don't do anything if this is not a DFS root. */
 611
 612         if ( !rootcli->dfsroot) {
 613                 *targetcli = rootcli;
 614                 pstrcpy( targetpath, path );
 615                 return True;
 616         }
 617
 618         *targetcli = NULL;
 619
 620         /* Send a trans2_query_path_info to check for a referral. */
 621
 622         clean_path(path, cleanpath);
 623         cli_dfs_make_full_path(rootcli, cleanpath, dfs_path );
 624
 625         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes ) ) {
 626                 /* This is an ordinary path, just return it. */
 627                 *targetcli = rootcli;
 628                 pstrcpy( targetpath, path );
 629                 goto done;
 630         }
 631
 632         /* Special case where client asked for a path that does not exist */
 633
 634         if ( cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND) ) {
 635                 *targetcli = rootcli;
 636                 pstrcpy( targetpath, path );
 637                 goto done;
 638         }
 639
 640         /* We got an error, check for DFS referral. */
 641
 642         if ( !cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED))  {
 643                 return False;
 644         }
 645
 646         /* Check for the referral. */
 647
 648         if ( !(cli_ipc = cli_cm_open( rootcli->desthost, "IPC$", False )) ) {
 649                 return False;
 650         }
 651
 652         if ( !cli_dfs_get_referral(cli_ipc, dfs_path, &refs, &num_refs, &consumed)
 653                         || !num_refs ) {
 654                 return False;
 655         }
 656
 657         /* Just store the first referral for now. */
 658
 659         split_dfs_path( refs[0].dfspath, server, share, extrapath );
 660         SAFE_FREE(refs);
 661
 662         /* Make sure to recreate the original string including any wildcards. */
 663
 664         cli_dfs_make_full_path( rootcli, path, dfs_path);
 665         pathlen = strlen( dfs_path )*2;
 666         consumed = MIN(pathlen, consumed );
 667         pstrcpy( targetpath, &dfs_path[consumed/2] );
 668         dfs_path[consumed/2] = '\0';
 669
 670         /*
 671          * targetpath is now the unconsumed part of the path.
 672          * dfs_path is now the consumed part of the path (in \server\share\path format).
 673          */
 674
 675         /* Open the connection to the target server & share */
 676
 677         if ( (*targetcli = cli_cm_open(server, share, False)) == NULL ) {
 678                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 679                         server, share );
 680                 return False;
 681         }
 682
 683         if (strlen(extrapath) > 0) {
 684                 string_append(&temppath, extrapath);
 685                 string_append(&temppath, targetpath);
 686                 pstrcpy( targetpath, temppath );
 687         }
 688
 689         /* parse out the consumed mount path */
 690         /* trim off the \server\share\ */
 691
 692         ppath = dfs_path;
 693
 694         if (*ppath != '\\') {
 695                 d_printf("cli_resolve_path: dfs_path (%s) not in correct format.\n",
 696                         dfs_path );
 697                 return False;
 698         }
 699
 700         ppath++; /* Now pointing at start of server name. */
 701
 702         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 703                 return False;
 704         }
 705
 706         ppath++; /* Now pointing at start of share name. */
 707
 708         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 709                 return False;
 710         }
 711
 712         ppath++; /* Now pointing at path component. */
 713
 714         pstr_sprintf( newmount, "%s\\%s", mountpt, ppath );
 715
 716         cli_cm_set_mntpoint( *targetcli, newmount );
 717
 718         /* Check for another dfs referral, note that we are not
 719            checking for loops here. */
 720
 721         if ( !strequal( targetpath, "\\" ) &&  !strequal( targetpath, "/")) {
 722                 if ( cli_resolve_path( newmount, *targetcli, targetpath, &newcli, newpath ) ) {
 723                         /*
 724                          * When cli_resolve_path returns true here it's always
 725                          * returning the complete path in newpath, so we're done
 726                          * here.
 727                          */
 728                         *targetcli = newcli;
 729                         pstrcpy( targetpath, newpath );
 730                         return True;
 731                 }
 732         }
 733
 734   done:
 735
 736         /* If returning True ensure we return a dfs root full path. */
 737         if ( (*targetcli)->dfsroot ) {
 738                 pstrcpy(dfs_path, targetpath );
 739                 cli_dfs_make_full_path( *targetcli, dfs_path, targetpath);
 740         }
 741
 742         return True;
 743 }
 744
 745 /********************************************************************
 746 ********************************************************************/
 747
 748 BOOL cli_check_msdfs_proxy( struct cli_state *cli, const char *sharename,
 749                             fstring newserver, fstring newshare )
 750 {
 751         CLIENT_DFS_REFERRAL *refs = NULL;
 752         size_t num_refs;
 753         uint16 consumed;
 754         pstring fullpath;
 755         BOOL res;
 756         uint16 cnum;
 757         pstring newextrapath;
 758
 759         if ( !cli || !sharename )
 760                 return False;
 761
 762         cnum = cli->cnum;
 763
 764         /* special case.  never check for a referral on the IPC$ share */
 765
 766         if ( strequal( sharename, "IPC$" ) ) {
 767                 return False;
 768         }
 769
 770         /* send a trans2_query_path_info to check for a referral */
 771
 772         pstr_sprintf( fullpath, "\\%s\\%s", cli->desthost, sharename );
 773
 774         /* check for the referral */
 775
 776         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
 777                 return False;
 778         }
 779
 780         res = cli_dfs_get_referral(cli, fullpath, &refs, &num_refs, &consumed);
 781
 782         if (!cli_tdis(cli)) {
 783                 SAFE_FREE( refs );
 784                 return False;
 785         }
 786
 787         cli->cnum = cnum;
 788
 789         if (!res || !num_refs ) {
 790                 SAFE_FREE( refs );
 791                 return False;
 792         }
 793
 794         split_dfs_path( refs[0].dfspath, newserver, newshare, newextrapath );
 795
 796         /* check that this is not a self-referral */
 797
 798         if ( strequal( cli->desthost, newserver ) && strequal( sharename, newshare ) ) {
 799                 SAFE_FREE( refs );
 800                 return False;
 801         }
 802
 803         SAFE_FREE( refs );
 804
 805         return True;
 806 }