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         char *mount;
  39 };
  40
  41 /* global state....globals reek! */
  42 int max_protocol = PROTOCOL_NT1;
  43
  44 static struct cm_cred_struct {
  45         char *username;
  46         char *password;
  47         bool got_pass;
  48         bool use_kerberos;
  49         int signing_state;
  50 } cm_creds;
  51
  52 static void cm_set_password(const char *newpass);
  53
  54 static int port;
  55 static int name_type = 0x20;
  56 static bool have_ip;
  57 static struct sockaddr_storage dest_ss;
  58
  59 static struct client_connection *connections;
  60
  61 /********************************************************************
  62  Return a connection to a server.
  63 ********************************************************************/
  64
  65 static struct cli_state *do_connect(TALLOC_CTX *ctx,
  66                                         const char *server,
  67                                         const char *share,
  68                                         bool show_sessetup)
  69 {
  70         struct cli_state *c = NULL;
  71         struct nmb_name called, calling;
  72         const char *server_n;
  73         struct sockaddr_storage ss;
  74         char *servicename;
  75         char *sharename;
  76         char *newserver, *newshare;
  77         const char *username;
  78         const char *password;
  79         NTSTATUS status;
  80
  81         /* make a copy so we don't modify the global string 'service' */
  82         servicename = talloc_strdup(ctx,share);
  83         if (!servicename) {
  84                 return NULL;
  85         }
  86         sharename = servicename;
  87         if (*sharename == '\\') {
  88                 server = sharename+2;
  89                 sharename = strchr_m(server,'\\');
  90                 if (!sharename) {
  91                         return NULL;
  92                 }
  93                 *sharename = 0;
  94                 sharename++;
  95         }
  96
  97         server_n = server;
  98
  99         zero_addr(&ss);
 100
 101         make_nmb_name(&calling, global_myname(), 0x0);
 102         make_nmb_name(&called , server, name_type);
 103
 104  again:
 105         zero_addr(&ss);
 106         if (have_ip)
 107                 ss = dest_ss;
 108
 109         /* have to open a new connection */
 110         if (!(c=cli_initialise()) || (cli_set_port(c, port) != port)) {
 111                 d_printf("Connection to %s failed\n", server_n);
 112                 return NULL;
 113         }
 114         status = cli_connect(c, server_n, &ss);
 115         if (!NT_STATUS_IS_OK(status)) {
 116                 d_printf("Connection to %s failed (Error %s)\n",
 117                                 server_n,
 118                                 nt_errstr(status));
 119                 return NULL;
 120         }
 121
 122         c->protocol = max_protocol;
 123         c->use_kerberos = cm_creds.use_kerberos;
 124         cli_setup_signing_state(c, cm_creds.signing_state);
 125
 126         if (!cli_session_request(c, &calling, &called)) {
 127                 char *p;
 128                 d_printf("session request to %s failed (%s)\n",
 129                          called.name, cli_errstr(c));
 130                 cli_shutdown(c);
 131                 c = NULL;
 132                 if ((p=strchr_m(called.name, '.'))) {
 133                         *p = 0;
 134                         goto again;
 135                 }
 136                 if (strcmp(called.name, "*SMBSERVER")) {
 137                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 138                         goto again;
 139                 }
 140                 return NULL;
 141         }
 142
 143         DEBUG(4,(" session request ok\n"));
 144
 145         if (!cli_negprot(c)) {
 146                 d_printf("protocol negotiation failed\n");
 147                 cli_shutdown(c);
 148                 return NULL;
 149         }
 150
 151         if (!cm_creds.got_pass) {
 152                 char *pass = getpass("Password: ");
 153                 if (pass) {
 154                         cm_set_password(pass);
 155                 }
 156         }
 157
 158         username = cm_creds.username ? cm_creds.username : "";
 159         password = cm_creds.password ? cm_creds.password : "";
 160
 161         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 162                                                password, strlen(password),
 163                                                password, strlen(password),
 164                                                lp_workgroup()))) {
 165                 /* If a password was not supplied then
 166                  * try again with a null username. */
 167                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 168                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 169                                                 "", 0,
 170                                                 "", 0,
 171                                                lp_workgroup()))) {
 172                         d_printf("session setup failed: %s\n", cli_errstr(c));
 173                         if (NT_STATUS_V(cli_nt_error(c)) ==
 174                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 175                                 d_printf("did you forget to run kinit?\n");
 176                         cli_shutdown(c);
 177                         return NULL;
 178                 }
 179                 d_printf("Anonymous login successful\n");
 180         }
 181
 182         if ( show_sessetup ) {
 183                 if (*c->server_domain) {
 184                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 185                                 c->server_domain,c->server_os,c->server_type));
 186                 } else if (*c->server_os || *c->server_type) {
 187                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 188                                  c->server_os,c->server_type));
 189                 }
 190         }
 191         DEBUG(4,(" session setup ok\n"));
 192
 193         /* here's the fun part....to support 'msdfs proxy' shares
 194            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 195            here before trying to connect to the original share.
 196            check_dfs_proxy() will fail if it is a normal share. */
 197
 198         if ((c->capabilities & CAP_DFS) &&
 199                         cli_check_msdfs_proxy(ctx, c, sharename,
 200                                 &newserver, &newshare)) {
 201                 cli_shutdown(c);
 202                 return do_connect(ctx, newserver, newshare, false);
 203         }
 204
 205         /* must be a normal share */
 206
 207         if (!cli_send_tconX(c, sharename, "?????",
 208                                 password, strlen(password)+1)) {
 209                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 210                 cli_shutdown(c);
 211                 return NULL;
 212         }
 213
 214         DEBUG(4,(" tconx ok\n"));
 215         return c;
 216 }
 217
 218 /****************************************************************************
 219 ****************************************************************************/
 220
 221 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
 222 {
 223         struct client_connection *p;
 224         int i;
 225
 226         for (p=connections,i=0; p; p=p->next,i++) {
 227                 if (strequal(p->cli->desthost, c->desthost) &&
 228                                 strequal(p->cli->share, c->share)) {
 229                         break;
 230                 }
 231         }
 232
 233         if (p) {
 234                 char *name = clean_name(NULL, p->mount);
 235                 if (!name) {
 236                         return;
 237                 }
 238                 p->mount = talloc_strdup(p, name);
 239                 TALLOC_FREE(name);
 240         }
 241 }
 242
 243 /****************************************************************************
 244 ****************************************************************************/
 245
 246 const char *cli_cm_get_mntpoint(struct cli_state *c)
 247 {
 248         struct client_connection *p;
 249         int i;
 250
 251         for (p=connections,i=0; p; p=p->next,i++) {
 252                 if (strequal(p->cli->desthost, c->desthost) &&
 253                                 strequal(p->cli->share, c->share)) {
 254                         break;
 255                 }
 256         }
 257
 258         if (p) {
 259                 return p->mount;
 260         }
 261         return NULL;
 262 }
 263
 264 /********************************************************************
 265  Add a new connection to the list
 266 ********************************************************************/
 267
 268 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 269                                         struct cli_state *referring_cli,
 270                                         const char *server,
 271                                         const char *share,
 272                                         bool show_hdr)
 273 {
 274         struct client_connection *node;
 275
 276         /* NB This must be the null context here... JRA. */
 277         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 278         if (!node) {
 279                 return NULL;
 280         }
 281
 282         node->cli = do_connect(ctx, server, share, show_hdr);
 283
 284         if ( !node->cli ) {
 285                 TALLOC_FREE( node );
 286                 return NULL;
 287         }
 288
 289         DLIST_ADD( connections, node );
 290
 291         cli_cm_set_mntpoint(node->cli, "");
 292
 293         if (referring_cli && referring_cli->posix_capabilities) {
 294                 uint16 major, minor;
 295                 uint32 caplow, caphigh;
 296                 if (cli_unix_extensions_version(node->cli, &major,
 297                                         &minor, &caplow, &caphigh)) {
 298                         cli_set_unix_extensions_capabilities(node->cli,
 299                                         major, minor,
 300                                         caplow, caphigh);
 301                 }
 302         }
 303
 304         return node->cli;
 305 }
 306
 307 /********************************************************************
 308  Return a connection to a server.
 309 ********************************************************************/
 310
 311 static struct cli_state *cli_cm_find(const char *server, const char *share)
 312 {
 313         struct client_connection *p;
 314
 315         for (p=connections; p; p=p->next) {
 316                 if ( strequal(server, p->cli->desthost) &&
 317                                 strequal(share,p->cli->share)) {
 318                         return p->cli;
 319                 }
 320         }
 321
 322         return NULL;
 323 }
 324
 325 /****************************************************************************
 326  Open a client connection to a \\server\share.  Set's the current *cli
 327  global variable as a side-effect (but only if the connection is successful).
 328 ****************************************************************************/
 329
 330 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 331                                 struct cli_state *referring_cli,
 332                                 const char *server,
 333                                 const char *share,
 334                                 bool show_hdr)
 335 {
 336         struct cli_state *c;
 337
 338         /* try to reuse an existing connection */
 339
 340         c = cli_cm_find(server, share);
 341         if (!c) {
 342                 c = cli_cm_connect(ctx, referring_cli, server, share, show_hdr);
 343         }
 344
 345         return c;
 346 }
 347
 348 /****************************************************************************
 349 ****************************************************************************/
 350
 351 void cli_cm_shutdown(void)
 352 {
 353         struct client_connection *p, *x;
 354
 355         for (p=connections; p;) {
 356                 cli_shutdown(p->cli);
 357                 x = p;
 358                 p = p->next;
 359
 360                 TALLOC_FREE(x);
 361         }
 362
 363         connections = NULL;
 364         return;
 365 }
 366
 367 /****************************************************************************
 368 ****************************************************************************/
 369
 370 void cli_cm_display(void)
 371 {
 372         struct client_connection *p;
 373         int i;
 374
 375         for ( p=connections,i=0; p; p=p->next,i++ ) {
 376                 d_printf("%d:\tserver=%s, share=%s\n",
 377                         i, p->cli->desthost, p->cli->share );
 378         }
 379 }
 380
 381 /****************************************************************************
 382 ****************************************************************************/
 383
 384 static void cm_set_password(const char *newpass)
 385 {
 386         SAFE_FREE(cm_creds.password);
 387         cm_creds.password = SMB_STRDUP(newpass);
 388         if (cm_creds.password) {
 389                 cm_creds.got_pass = true;
 390         }
 391 }
 392
 393 void cli_cm_set_credentials(void)
 394 {
 395         SAFE_FREE(cm_creds.username);
 396         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username());
 397
 398         if (get_cmdline_auth_info_got_pass()) {
 399                 cm_set_password(get_cmdline_auth_info_password());
 400         }
 401
 402         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos();
 403         cm_creds.signing_state = get_cmdline_auth_info_signing_state();
 404 }
 405
 406 /****************************************************************************
 407 ****************************************************************************/
 408
 409 void cli_cm_set_port(int port_number)
 410 {
 411         port = port_number;
 412 }
 413
 414 /****************************************************************************
 415 ****************************************************************************/
 416
 417 void cli_cm_set_dest_name_type(int type)
 418 {
 419         name_type = type;
 420 }
 421
 422 /****************************************************************************
 423 ****************************************************************************/
 424
 425 void cli_cm_set_dest_ss(struct sockaddr_storage *pss)
 426 {
 427         dest_ss = *pss;
 428         have_ip = true;
 429 }
 430
 431 /**********************************************************************
 432  split a dfs path into the server, share name, and extrapath components
 433 **********************************************************************/
 434
 435 static void split_dfs_path(TALLOC_CTX *ctx,
 436                                 const char *nodepath,
 437                                 char **pp_server,
 438                                 char **pp_share,
 439                                 char **pp_extrapath)
 440 {
 441         char *p, *q;
 442         char *path;
 443
 444         *pp_server = NULL;
 445         *pp_share = NULL;
 446         *pp_extrapath = NULL;
 447
 448         path = talloc_strdup(ctx, nodepath);
 449         if (!path) {
 450                 return;
 451         }
 452
 453         if ( path[0] != '\\' ) {
 454                 return;
 455         }
 456
 457         p = strchr_m( path + 1, '\\' );
 458         if ( !p ) {
 459                 return;
 460         }
 461
 462         *p = '\0';
 463         p++;
 464
 465         /* Look for any extra/deep path */
 466         q = strchr_m(p, '\\');
 467         if (q != NULL) {
 468                 *q = '\0';
 469                 q++;
 470                 *pp_extrapath = talloc_strdup(ctx, q);
 471         } else {
 472                 *pp_extrapath = talloc_strdup(ctx, "");
 473         }
 474
 475         *pp_share = talloc_strdup(ctx, p);
 476         *pp_server = talloc_strdup(ctx, &path[1]);
 477 }
 478
 479 /****************************************************************************
 480  Return the original path truncated at the directory component before
 481  the first wildcard character. Trust the caller to provide a NULL
 482  terminated string
 483 ****************************************************************************/
 484
 485 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 486 {
 487         size_t len;
 488         char *p1, *p2, *p;
 489         char *path_out;
 490
 491         /* No absolute paths. */
 492         while (IS_DIRECTORY_SEP(*path)) {
 493                 path++;
 494         }
 495
 496         path_out = talloc_strdup(ctx, path);
 497         if (!path_out) {
 498                 return NULL;
 499         }
 500
 501         p1 = strchr_m(path_out, '*');
 502         p2 = strchr_m(path_out, '?');
 503
 504         if (p1 || p2) {
 505                 if (p1 && p2) {
 506                         p = MIN(p1,p2);
 507                 } else if (!p1) {
 508                         p = p2;
 509                 } else {
 510                         p = p1;
 511                 }
 512                 *p = '\0';
 513
 514                 /* Now go back to the start of this component. */
 515                 p1 = strrchr_m(path_out, '/');
 516                 p2 = strrchr_m(path_out, '\\');
 517                 p = MAX(p1,p2);
 518                 if (p) {
 519                         *p = '\0';
 520                 }
 521         }
 522
 523         /* Strip any trailing separator */
 524
 525         len = strlen(path_out);
 526         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 527                 path_out[len-1] = '\0';
 528         }
 529
 530         return path_out;
 531 }
 532
 533 /****************************************************************************
 534 ****************************************************************************/
 535
 536 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 537                                         struct cli_state *cli,
 538                                         const char *dir)
 539 {
 540         /* Ensure the extrapath doesn't start with a separator. */
 541         while (IS_DIRECTORY_SEP(*dir)) {
 542                 dir++;
 543         }
 544
 545         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 546                         cli->desthost, cli->share, dir);
 547 }
 548
 549 /********************************************************************
 550  check for dfs referral
 551 ********************************************************************/
 552
 553 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 554 {
 555         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 556
 557         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 558
 559         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 560                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 561                 return false;
 562
 563         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 564                 return true;
 565
 566         return false;
 567 }
 568
 569 /********************************************************************
 570  Get the dfs referral link.
 571 ********************************************************************/
 572
 573 bool cli_dfs_get_referral(struct cli_state *cli,
 574                         const char *path,
 575                         CLIENT_DFS_REFERRAL**refs,
 576                         size_t *num_refs,
 577                         uint16 *consumed)
 578 {
 579         unsigned int data_len = 0;
 580         unsigned int param_len = 0;
 581         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 582         char param[1024+2];
 583         char *rparam=NULL, *rdata=NULL;
 584         char *p;
 585         size_t pathlen = 2*(strlen(path)+1);
 586         uint16 num_referrals;
 587         CLIENT_DFS_REFERRAL *referrals = NULL;
 588
 589         memset(param, 0, sizeof(param));
 590         SSVAL(param, 0, 0x03);  /* max referral level */
 591         p = &param[2];
 592
 593         p += clistr_push(cli, p, path, MIN(pathlen, sizeof(param)-2),
 594                         STR_TERMINATE);
 595         param_len = PTR_DIFF(p, param);
 596
 597         if (!cli_send_trans(cli, SMBtrans2,
 598                 NULL,                        /* name */
 599                 -1, 0,                          /* fid, flags */
 600                 &setup, 1, 0,                   /* setup, length, max */
 601                 param, param_len, 2,            /* param, length, max */
 602                 NULL, 0, cli->max_xmit /* data, length, max */
 603                 )) {
 604                         return false;
 605         }
 606
 607         if (!cli_receive_trans(cli, SMBtrans2,
 608                 &rparam, &param_len,
 609                 &rdata, &data_len)) {
 610                         return false;
 611         }
 612
 613         *consumed     = SVAL( rdata, 0 );
 614         num_referrals = SVAL( rdata, 2 );
 615
 616         if ( num_referrals != 0 ) {
 617                 uint16 ref_version;
 618                 uint16 ref_size;
 619                 int i;
 620                 uint16 node_offset;
 621
 622                 referrals = SMB_XMALLOC_ARRAY( CLIENT_DFS_REFERRAL,
 623                                 num_referrals);
 624
 625                 /* start at the referrals array */
 626
 627                 p = rdata+8;
 628                 for ( i=0; i<num_referrals; i++ ) {
 629                         ref_version = SVAL( p, 0 );
 630                         ref_size    = SVAL( p, 2 );
 631                         node_offset = SVAL( p, 16 );
 632
 633                         if ( ref_version != 3 ) {
 634                                 p += ref_size;
 635                                 continue;
 636                         }
 637
 638                         referrals[i].proximity = SVAL( p, 8 );
 639                         referrals[i].ttl       = SVAL( p, 10 );
 640
 641                         clistr_pull( cli, referrals[i].dfspath, p+node_offset,
 642                                 sizeof(referrals[i].dfspath), -1,
 643                                 STR_TERMINATE|STR_UNICODE );
 644
 645                         p += ref_size;
 646                 }
 647         }
 648
 649         *num_refs = num_referrals;
 650         *refs = referrals;
 651
 652         SAFE_FREE(rdata);
 653         SAFE_FREE(rparam);
 654
 655         return true;
 656 }
 657
 658
 659 /********************************************************************
 660 ********************************************************************/
 661
 662 bool cli_resolve_path(TALLOC_CTX *ctx,
 663                         const char *mountpt,
 664                         struct cli_state *rootcli,
 665                         const char *path,
 666                         struct cli_state **targetcli,
 667                         char **pp_targetpath)
 668 {
 669         CLIENT_DFS_REFERRAL *refs = NULL;
 670         size_t num_refs;
 671         uint16 consumed;
 672         struct cli_state *cli_ipc = NULL;
 673         char *dfs_path = NULL;
 674         char *cleanpath = NULL;
 675         char *extrapath = NULL;
 676         int pathlen;
 677         char *server = NULL;
 678         char *share = NULL;
 679         struct cli_state *newcli = NULL;
 680         char *newpath = NULL;
 681         char *newmount = NULL;
 682         char *ppath = NULL;
 683         SMB_STRUCT_STAT sbuf;
 684         uint32 attributes;
 685
 686         if ( !rootcli || !path || !targetcli ) {
 687                 return false;
 688         }
 689
 690         /* Don't do anything if this is not a DFS root. */
 691
 692         if ( !rootcli->dfsroot) {
 693                 *targetcli = rootcli;
 694                 *pp_targetpath = talloc_strdup(ctx, path);
 695                 if (!*pp_targetpath) {
 696                         return false;
 697                 }
 698                 return true;
 699         }
 700
 701         *targetcli = NULL;
 702
 703         /* Send a trans2_query_path_info to check for a referral. */
 704
 705         cleanpath = clean_path(ctx, path);
 706         if (!cleanpath) {
 707                 return false;
 708         }
 709
 710         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 711         if (!dfs_path) {
 712                 return false;
 713         }
 714
 715         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 716                 /* This is an ordinary path, just return it. */
 717                 *targetcli = rootcli;
 718                 *pp_targetpath = talloc_strdup(ctx, path);
 719                 if (!*pp_targetpath) {
 720                         return false;
 721                 }
 722                 goto done;
 723         }
 724
 725         /* Special case where client asked for a path that does not exist */
 726
 727         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 728                 *targetcli = rootcli;
 729                 *pp_targetpath = talloc_strdup(ctx, path);
 730                 if (!*pp_targetpath) {
 731                         return false;
 732                 }
 733                 goto done;
 734         }
 735
 736         /* We got an error, check for DFS referral. */
 737
 738         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 739                 return false;
 740         }
 741
 742         /* Check for the referral. */
 743
 744         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 745                                         rootcli->desthost, "IPC$", false))) {
 746                 return false;
 747         }
 748
 749         if (!cli_dfs_get_referral(cli_ipc, dfs_path, &refs,
 750                         &num_refs, &consumed) || !num_refs) {
 751                 return false;
 752         }
 753
 754         /* Just store the first referral for now. */
 755
 756         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 757         SAFE_FREE(refs);
 758
 759         if (!server || !share) {
 760                 return false;
 761         }
 762
 763         /* Make sure to recreate the original string including any wildcards. */
 764
 765         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 766         if (!dfs_path) {
 767                 return false;
 768         }
 769         pathlen = strlen(dfs_path)*2;
 770         consumed = MIN(pathlen, consumed);
 771         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 772         if (!*pp_targetpath) {
 773                 return false;
 774         }
 775         dfs_path[consumed/2] = '\0';
 776
 777         /*
 778          * *pp_targetpath is now the unconsumed part of the path.
 779          * dfs_path is now the consumed part of the path
 780          * (in \server\share\path format).
 781          */
 782
 783         /* Open the connection to the target server & share */
 784         if ((*targetcli = cli_cm_open(ctx, rootcli,
 785                                         server, share, false)) == NULL) {
 786                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 787                         server, share );
 788                 return false;
 789         }
 790
 791         if (extrapath && strlen(extrapath) > 0) {
 792                 *pp_targetpath = talloc_asprintf(ctx,
 793                                                 "%s%s",
 794                                                 extrapath,
 795                                                 *pp_targetpath);
 796                 if (!*pp_targetpath) {
 797                         return false;
 798                 }
 799         }
 800
 801         /* parse out the consumed mount path */
 802         /* trim off the \server\share\ */
 803
 804         ppath = dfs_path;
 805
 806         if (*ppath != '\\') {
 807                 d_printf("cli_resolve_path: "
 808                         "dfs_path (%s) not in correct format.\n",
 809                         dfs_path );
 810                 return false;
 811         }
 812
 813         ppath++; /* Now pointing at start of server name. */
 814
 815         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 816                 return false;
 817         }
 818
 819         ppath++; /* Now pointing at start of share name. */
 820
 821         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 822                 return false;
 823         }
 824
 825         ppath++; /* Now pointing at path component. */
 826
 827         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 828         if (!newmount) {
 829                 return false;
 830         }
 831
 832         cli_cm_set_mntpoint(*targetcli, newmount);
 833
 834         /* Check for another dfs referral, note that we are not
 835            checking for loops here. */
 836
 837         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 838                 if (cli_resolve_path(ctx,
 839                                         newmount,
 840                                         *targetcli,
 841                                         *pp_targetpath,
 842                                         &newcli,
 843                                         &newpath)) {
 844                         /*
 845                          * When cli_resolve_path returns true here it's always
 846                          * returning the complete path in newpath, so we're done
 847                          * here.
 848                          */
 849                         *targetcli = newcli;
 850                         *pp_targetpath = newpath;
 851                         return true;
 852                 }
 853         }
 854
 855   done:
 856
 857         /* If returning true ensure we return a dfs root full path. */
 858         if ((*targetcli)->dfsroot) {
 859                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 860                 if (!dfs_path) {
 861                         return false;
 862                 }
 863                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 864         }
 865
 866         return true;
 867 }
 868
 869 /********************************************************************
 870 ********************************************************************/
 871
 872 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 873                                 struct cli_state *cli,
 874                                 const char *sharename,
 875                                 char **pp_newserver,
 876                                 char **pp_newshare )
 877 {
 878         CLIENT_DFS_REFERRAL *refs = NULL;
 879         size_t num_refs;
 880         uint16 consumed;
 881         char *fullpath = NULL;
 882         bool res;
 883         uint16 cnum;
 884         char *newextrapath = NULL;
 885
 886         if (!cli || !sharename) {
 887                 return false;
 888         }
 889
 890         cnum = cli->cnum;
 891
 892         /* special case.  never check for a referral on the IPC$ share */
 893
 894         if (strequal(sharename, "IPC$")) {
 895                 return false;
 896         }
 897
 898         /* send a trans2_query_path_info to check for a referral */
 899
 900         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
 901         if (!fullpath) {
 902                 return false;
 903         }
 904
 905         /* check for the referral */
 906
 907         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
 908                 return false;
 909         }
 910
 911         res = cli_dfs_get_referral(cli, fullpath, &refs, &num_refs, &consumed);
 912
 913         if (!cli_tdis(cli)) {
 914                 SAFE_FREE(refs);
 915                 return false;
 916         }
 917
 918         cli->cnum = cnum;
 919
 920         if (!res || !num_refs) {
 921                 SAFE_FREE(refs);
 922                 return false;
 923         }
 924
 925         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
 926                         pp_newshare, &newextrapath );
 927
 928         SAFE_FREE(refs);
 929
 930         if (!pp_newserver || !pp_newshare) {
 931                 return false;
 932         }
 933
 934         /* check that this is not a self-referral */
 935
 936         if (strequal(cli->desthost, *pp_newserver) &&
 937                         strequal(sharename, *pp_newshare)) {
 938                 return false;
 939         }
 940
 941         return true;
 942 }