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 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 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
  62                                 struct cli_state *cli,
  63                                 const char *sharename,
  64                                 char **pp_newserver,
  65                                 char **pp_newshare,
  66                                 bool force_encrypt,
  67                                 const char *username,
  68                                 const char *password,
  69                                 const char *domain);
  70
  71 /********************************************************************
  72  Ensure a connection is encrypted.
  73 ********************************************************************/
  74
  75 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  76                         const char *username,
  77                         const char *password,
  78                         const char *domain,
  79                         const char *sharename)
  80 {
  81         NTSTATUS status = cli_force_encryption(c,
  82                                         username,
  83                                         password,
  84                                         domain);
  85
  86         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  87                 d_printf("Encryption required and "
  88                         "server that doesn't support "
  89                         "UNIX extensions - failing connect\n");
  90         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  91                 d_printf("Encryption required and "
  92                         "can't get UNIX CIFS extensions "
  93                         "version from server.\n");
  94         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  95                 d_printf("Encryption required and "
  96                         "share %s doesn't support "
  97                         "encryption.\n", sharename);
  98         } else if (!NT_STATUS_IS_OK(status)) {
  99                 d_printf("Encryption required and "
 100                         "setup failed with error %s.\n",
 101                         nt_errstr(status));
 102         }
 103
 104         return status;
 105 }
 106
 107 /********************************************************************
 108  Return a connection to a server.
 109 ********************************************************************/
 110
 111 static struct cli_state *do_connect(TALLOC_CTX *ctx,
 112                                         const char *server,
 113                                         const char *share,
 114                                         bool show_sessetup,
 115                                         bool force_encrypt)
 116 {
 117         struct cli_state *c = NULL;
 118         struct nmb_name called, calling;
 119         const char *server_n;
 120         struct sockaddr_storage ss;
 121         char *servicename;
 122         char *sharename;
 123         char *newserver, *newshare;
 124         const char *username;
 125         const char *password;
 126         NTSTATUS status;
 127
 128         /* make a copy so we don't modify the global string 'service' */
 129         servicename = talloc_strdup(ctx,share);
 130         if (!servicename) {
 131                 return NULL;
 132         }
 133         sharename = servicename;
 134         if (*sharename == '\\') {
 135                 server = sharename+2;
 136                 sharename = strchr_m(server,'\\');
 137                 if (!sharename) {
 138                         return NULL;
 139                 }
 140                 *sharename = 0;
 141                 sharename++;
 142         }
 143
 144         server_n = server;
 145
 146         zero_addr(&ss);
 147
 148         make_nmb_name(&calling, global_myname(), 0x0);
 149         make_nmb_name(&called , server, name_type);
 150
 151  again:
 152         zero_addr(&ss);
 153         if (have_ip)
 154                 ss = dest_ss;
 155
 156         /* have to open a new connection */
 157         if (!(c=cli_initialise()) || (cli_set_port(c, port) != port)) {
 158                 d_printf("Connection to %s failed\n", server_n);
 159                 if (c) {
 160                         cli_shutdown(c);
 161                 }
 162                 return NULL;
 163         }
 164         status = cli_connect(c, server_n, &ss);
 165         if (!NT_STATUS_IS_OK(status)) {
 166                 d_printf("Connection to %s failed (Error %s)\n",
 167                                 server_n,
 168                                 nt_errstr(status));
 169                 cli_shutdown(c);
 170                 return NULL;
 171         }
 172
 173         c->protocol = max_protocol;
 174         c->use_kerberos = cm_creds.use_kerberos;
 175         cli_setup_signing_state(c, cm_creds.signing_state);
 176
 177         if (!cli_session_request(c, &calling, &called)) {
 178                 char *p;
 179                 d_printf("session request to %s failed (%s)\n",
 180                          called.name, cli_errstr(c));
 181                 cli_shutdown(c);
 182                 c = NULL;
 183                 if ((p=strchr_m(called.name, '.'))) {
 184                         *p = 0;
 185                         goto again;
 186                 }
 187                 if (strcmp(called.name, "*SMBSERVER")) {
 188                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 189                         goto again;
 190                 }
 191                 return NULL;
 192         }
 193
 194         DEBUG(4,(" session request ok\n"));
 195
 196         if (!cli_negprot(c)) {
 197                 d_printf("protocol negotiation failed\n");
 198                 cli_shutdown(c);
 199                 return NULL;
 200         }
 201
 202         if (!cm_creds.got_pass) {
 203                 char *pass = getpass("Password: ");
 204                 if (pass) {
 205                         cm_set_password(pass);
 206                 }
 207         }
 208
 209         username = cm_creds.username ? cm_creds.username : "";
 210         password = cm_creds.password ? cm_creds.password : "";
 211
 212         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 213                                                password, strlen(password),
 214                                                password, strlen(password),
 215                                                lp_workgroup()))) {
 216                 /* If a password was not supplied then
 217                  * try again with a null username. */
 218                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 219                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 220                                                 "", 0,
 221                                                 "", 0,
 222                                                lp_workgroup()))) {
 223                         d_printf("session setup failed: %s\n", cli_errstr(c));
 224                         if (NT_STATUS_V(cli_nt_error(c)) ==
 225                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 226                                 d_printf("did you forget to run kinit?\n");
 227                         cli_shutdown(c);
 228                         return NULL;
 229                 }
 230                 d_printf("Anonymous login successful\n");
 231         }
 232
 233         if ( show_sessetup ) {
 234                 if (*c->server_domain) {
 235                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 236                                 c->server_domain,c->server_os,c->server_type));
 237                 } else if (*c->server_os || *c->server_type) {
 238                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 239                                  c->server_os,c->server_type));
 240                 }
 241         }
 242         DEBUG(4,(" session setup ok\n"));
 243
 244         /* here's the fun part....to support 'msdfs proxy' shares
 245            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 246            here before trying to connect to the original share.
 247            check_dfs_proxy() will fail if it is a normal share. */
 248
 249         if ((c->capabilities & CAP_DFS) &&
 250                         cli_check_msdfs_proxy(ctx, c, sharename,
 251                                 &newserver, &newshare,
 252                                 force_encrypt,
 253                                 username,
 254                                 password,
 255                                 lp_workgroup())) {
 256                 cli_shutdown(c);
 257                 return do_connect(ctx, newserver,
 258                                 newshare, false, force_encrypt);
 259         }
 260
 261         /* must be a normal share */
 262
 263         if (!cli_send_tconX(c, sharename, "?????",
 264                                 password, strlen(password)+1)) {
 265                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 266                 cli_shutdown(c);
 267                 return NULL;
 268         }
 269
 270         if (force_encrypt) {
 271                 status = cli_cm_force_encryption(c,
 272                                         username,
 273                                         password,
 274                                         lp_workgroup(),
 275                                         sharename);
 276                 if (!NT_STATUS_IS_OK(status)) {
 277                         cli_shutdown(c);
 278                         return NULL;
 279                 }
 280         }
 281
 282         DEBUG(4,(" tconx ok\n"));
 283         return c;
 284 }
 285
 286 /****************************************************************************
 287 ****************************************************************************/
 288
 289 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
 290 {
 291         struct client_connection *p;
 292         int i;
 293
 294         for (p=connections,i=0; p; p=p->next,i++) {
 295                 if (strequal(p->cli->desthost, c->desthost) &&
 296                                 strequal(p->cli->share, c->share)) {
 297                         break;
 298                 }
 299         }
 300
 301         if (p) {
 302                 char *name = clean_name(NULL, p->mount);
 303                 if (!name) {
 304                         return;
 305                 }
 306                 p->mount = talloc_strdup(p, name);
 307                 TALLOC_FREE(name);
 308         }
 309 }
 310
 311 /****************************************************************************
 312 ****************************************************************************/
 313
 314 const char *cli_cm_get_mntpoint(struct cli_state *c)
 315 {
 316         struct client_connection *p;
 317         int i;
 318
 319         for (p=connections,i=0; p; p=p->next,i++) {
 320                 if (strequal(p->cli->desthost, c->desthost) &&
 321                                 strequal(p->cli->share, c->share)) {
 322                         break;
 323                 }
 324         }
 325
 326         if (p) {
 327                 return p->mount;
 328         }
 329         return NULL;
 330 }
 331
 332 /********************************************************************
 333  Add a new connection to the list
 334 ********************************************************************/
 335
 336 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 337                                         struct cli_state *referring_cli,
 338                                         const char *server,
 339                                         const char *share,
 340                                         bool show_hdr,
 341                                         bool force_encrypt)
 342 {
 343         struct client_connection *node;
 344
 345         /* NB This must be the null context here... JRA. */
 346         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 347         if (!node) {
 348                 return NULL;
 349         }
 350
 351         node->cli = do_connect(ctx, server, share, show_hdr, force_encrypt);
 352
 353         if ( !node->cli ) {
 354                 TALLOC_FREE( node );
 355                 return NULL;
 356         }
 357
 358         DLIST_ADD( connections, node );
 359
 360         cli_cm_set_mntpoint(node->cli, "");
 361
 362         if (referring_cli && referring_cli->posix_capabilities) {
 363                 uint16 major, minor;
 364                 uint32 caplow, caphigh;
 365                 if (cli_unix_extensions_version(node->cli, &major,
 366                                         &minor, &caplow, &caphigh)) {
 367                         cli_set_unix_extensions_capabilities(node->cli,
 368                                         major, minor,
 369                                         caplow, caphigh);
 370                 }
 371         }
 372
 373         return node->cli;
 374 }
 375
 376 /********************************************************************
 377  Return a connection to a server.
 378 ********************************************************************/
 379
 380 static struct cli_state *cli_cm_find(const char *server, const char *share)
 381 {
 382         struct client_connection *p;
 383
 384         for (p=connections; p; p=p->next) {
 385                 if ( strequal(server, p->cli->desthost) &&
 386                                 strequal(share,p->cli->share)) {
 387                         return p->cli;
 388                 }
 389         }
 390
 391         return NULL;
 392 }
 393
 394 /****************************************************************************
 395  Open a client connection to a \\server\share.  Set's the current *cli
 396  global variable as a side-effect (but only if the connection is successful).
 397 ****************************************************************************/
 398
 399 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 400                                 struct cli_state *referring_cli,
 401                                 const char *server,
 402                                 const char *share,
 403                                 bool show_hdr,
 404                                 bool force_encrypt)
 405 {
 406         struct cli_state *c;
 407
 408         /* try to reuse an existing connection */
 409
 410         c = cli_cm_find(server, share);
 411         if (!c) {
 412                 c = cli_cm_connect(ctx, referring_cli,
 413                                 server, share, show_hdr, force_encrypt);
 414         }
 415
 416         return c;
 417 }
 418
 419 /****************************************************************************
 420 ****************************************************************************/
 421
 422 void cli_cm_shutdown(void)
 423 {
 424         struct client_connection *p, *x;
 425
 426         for (p=connections; p;) {
 427                 cli_shutdown(p->cli);
 428                 x = p;
 429                 p = p->next;
 430
 431                 TALLOC_FREE(x);
 432         }
 433
 434         connections = NULL;
 435         return;
 436 }
 437
 438 /****************************************************************************
 439 ****************************************************************************/
 440
 441 void cli_cm_display(void)
 442 {
 443         struct client_connection *p;
 444         int i;
 445
 446         for ( p=connections,i=0; p; p=p->next,i++ ) {
 447                 d_printf("%d:\tserver=%s, share=%s\n",
 448                         i, p->cli->desthost, p->cli->share );
 449         }
 450 }
 451
 452 /****************************************************************************
 453 ****************************************************************************/
 454
 455 static void cm_set_password(const char *newpass)
 456 {
 457         SAFE_FREE(cm_creds.password);
 458         cm_creds.password = SMB_STRDUP(newpass);
 459         if (cm_creds.password) {
 460                 cm_creds.got_pass = true;
 461         }
 462 }
 463
 464 void cli_cm_set_credentials(void)
 465 {
 466         SAFE_FREE(cm_creds.username);
 467         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username());
 468
 469         if (get_cmdline_auth_info_got_pass()) {
 470                 cm_set_password(get_cmdline_auth_info_password());
 471         }
 472
 473         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos();
 474         cm_creds.signing_state = get_cmdline_auth_info_signing_state();
 475 }
 476
 477 /****************************************************************************
 478 ****************************************************************************/
 479
 480 void cli_cm_set_port(int port_number)
 481 {
 482         port = port_number;
 483 }
 484
 485 /****************************************************************************
 486 ****************************************************************************/
 487
 488 void cli_cm_set_dest_name_type(int type)
 489 {
 490         name_type = type;
 491 }
 492
 493 /****************************************************************************
 494 ****************************************************************************/
 495
 496 void cli_cm_set_dest_ss(struct sockaddr_storage *pss)
 497 {
 498         dest_ss = *pss;
 499         have_ip = true;
 500 }
 501
 502 /**********************************************************************
 503  split a dfs path into the server, share name, and extrapath components
 504 **********************************************************************/
 505
 506 static void split_dfs_path(TALLOC_CTX *ctx,
 507                                 const char *nodepath,
 508                                 char **pp_server,
 509                                 char **pp_share,
 510                                 char **pp_extrapath)
 511 {
 512         char *p, *q;
 513         char *path;
 514
 515         *pp_server = NULL;
 516         *pp_share = NULL;
 517         *pp_extrapath = NULL;
 518
 519         path = talloc_strdup(ctx, nodepath);
 520         if (!path) {
 521                 return;
 522         }
 523
 524         if ( path[0] != '\\' ) {
 525                 return;
 526         }
 527
 528         p = strchr_m( path + 1, '\\' );
 529         if ( !p ) {
 530                 return;
 531         }
 532
 533         *p = '\0';
 534         p++;
 535
 536         /* Look for any extra/deep path */
 537         q = strchr_m(p, '\\');
 538         if (q != NULL) {
 539                 *q = '\0';
 540                 q++;
 541                 *pp_extrapath = talloc_strdup(ctx, q);
 542         } else {
 543                 *pp_extrapath = talloc_strdup(ctx, "");
 544         }
 545
 546         *pp_share = talloc_strdup(ctx, p);
 547         *pp_server = talloc_strdup(ctx, &path[1]);
 548 }
 549
 550 /****************************************************************************
 551  Return the original path truncated at the directory component before
 552  the first wildcard character. Trust the caller to provide a NULL
 553  terminated string
 554 ****************************************************************************/
 555
 556 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 557 {
 558         size_t len;
 559         char *p1, *p2, *p;
 560         char *path_out;
 561
 562         /* No absolute paths. */
 563         while (IS_DIRECTORY_SEP(*path)) {
 564                 path++;
 565         }
 566
 567         path_out = talloc_strdup(ctx, path);
 568         if (!path_out) {
 569                 return NULL;
 570         }
 571
 572         p1 = strchr_m(path_out, '*');
 573         p2 = strchr_m(path_out, '?');
 574
 575         if (p1 || p2) {
 576                 if (p1 && p2) {
 577                         p = MIN(p1,p2);
 578                 } else if (!p1) {
 579                         p = p2;
 580                 } else {
 581                         p = p1;
 582                 }
 583                 *p = '\0';
 584
 585                 /* Now go back to the start of this component. */
 586                 p1 = strrchr_m(path_out, '/');
 587                 p2 = strrchr_m(path_out, '\\');
 588                 p = MAX(p1,p2);
 589                 if (p) {
 590                         *p = '\0';
 591                 }
 592         }
 593
 594         /* Strip any trailing separator */
 595
 596         len = strlen(path_out);
 597         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 598                 path_out[len-1] = '\0';
 599         }
 600
 601         return path_out;
 602 }
 603
 604 /****************************************************************************
 605 ****************************************************************************/
 606
 607 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 608                                         struct cli_state *cli,
 609                                         const char *dir)
 610 {
 611         /* Ensure the extrapath doesn't start with a separator. */
 612         while (IS_DIRECTORY_SEP(*dir)) {
 613                 dir++;
 614         }
 615
 616         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 617                         cli->desthost, cli->share, dir);
 618 }
 619
 620 /********************************************************************
 621  check for dfs referral
 622 ********************************************************************/
 623
 624 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 625 {
 626         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 627
 628         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 629
 630         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 631                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 632                 return false;
 633
 634         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 635                 return true;
 636
 637         return false;
 638 }
 639
 640 /********************************************************************
 641  Get the dfs referral link.
 642 ********************************************************************/
 643
 644 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 645                         struct cli_state *cli,
 646                         const char *path,
 647                         CLIENT_DFS_REFERRAL**refs,
 648                         size_t *num_refs,
 649                         uint16 *consumed)
 650 {
 651         unsigned int data_len = 0;
 652         unsigned int param_len = 0;
 653         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 654         char *param;
 655         char *rparam=NULL, *rdata=NULL;
 656         char *p;
 657         char *endp;
 658         size_t pathlen = 2*(strlen(path)+1);
 659         uint16 num_referrals;
 660         CLIENT_DFS_REFERRAL *referrals = NULL;
 661         bool ret = false;
 662
 663         *num_refs = 0;
 664         *refs = NULL;
 665
 666         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 667         if (!param) {
 668                 return false;
 669         }
 670         SSVAL(param, 0, 0x03);  /* max referral level */
 671         p = &param[2];
 672
 673         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 674         param_len = PTR_DIFF(p, param);
 675
 676         if (!cli_send_trans(cli, SMBtrans2,
 677                         NULL,                        /* name */
 678                         -1, 0,                          /* fid, flags */
 679                         &setup, 1, 0,                   /* setup, length, max */
 680                         param, param_len, 2,            /* param, length, max */
 681                         NULL, 0, cli->max_xmit /* data, length, max */
 682                         )) {
 683                 SAFE_FREE(param);
 684                 return false;
 685         }
 686
 687         SAFE_FREE(param);
 688
 689         if (!cli_receive_trans(cli, SMBtrans2,
 690                 &rparam, &param_len,
 691                 &rdata, &data_len)) {
 692                         return false;
 693         }
 694
 695         if (data_len < 4) {
 696                 goto out;
 697         }
 698
 699         endp = rdata + data_len;
 700
 701         *consumed     = SVAL(rdata, 0);
 702         num_referrals = SVAL(rdata, 2);
 703
 704         if (num_referrals != 0) {
 705                 uint16 ref_version;
 706                 uint16 ref_size;
 707                 int i;
 708                 uint16 node_offset;
 709
 710                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 711                                 num_referrals);
 712
 713                 if (!referrals) {
 714                         goto out;
 715                 }
 716                 /* start at the referrals array */
 717
 718                 p = rdata+8;
 719                 for (i=0; i<num_referrals && p < endp; i++) {
 720                         if (p + 18 > endp) {
 721                                 goto out;
 722                         }
 723                         ref_version = SVAL(p, 0);
 724                         ref_size    = SVAL(p, 2);
 725                         node_offset = SVAL(p, 16);
 726
 727                         if (ref_version != 3) {
 728                                 p += ref_size;
 729                                 continue;
 730                         }
 731
 732                         referrals[i].proximity = SVAL(p, 8);
 733                         referrals[i].ttl       = SVAL(p, 10);
 734
 735                         if (p + node_offset > endp) {
 736                                 goto out;
 737                         }
 738                         clistr_pull_talloc(ctx, cli, &referrals[i].dfspath,
 739                                 p+node_offset, -1,
 740                                 STR_TERMINATE|STR_UNICODE );
 741
 742                         if (!referrals[i].dfspath) {
 743                                 goto out;
 744                         }
 745                         p += ref_size;
 746                 }
 747                 if (i < num_referrals) {
 748                         goto out;
 749                 }
 750         }
 751
 752         ret = true;
 753
 754         *num_refs = num_referrals;
 755         *refs = referrals;
 756
 757   out:
 758
 759         SAFE_FREE(rdata);
 760         SAFE_FREE(rparam);
 761         return ret;
 762 }
 763
 764 /********************************************************************
 765 ********************************************************************/
 766
 767 bool cli_resolve_path(TALLOC_CTX *ctx,
 768                         const char *mountpt,
 769                         struct cli_state *rootcli,
 770                         const char *path,
 771                         struct cli_state **targetcli,
 772                         char **pp_targetpath)
 773 {
 774         CLIENT_DFS_REFERRAL *refs = NULL;
 775         size_t num_refs = 0;
 776         uint16 consumed;
 777         struct cli_state *cli_ipc = NULL;
 778         char *dfs_path = NULL;
 779         char *cleanpath = NULL;
 780         char *extrapath = NULL;
 781         int pathlen;
 782         char *server = NULL;
 783         char *share = NULL;
 784         struct cli_state *newcli = NULL;
 785         char *newpath = NULL;
 786         char *newmount = NULL;
 787         char *ppath = NULL;
 788         SMB_STRUCT_STAT sbuf;
 789         uint32 attributes;
 790
 791         if ( !rootcli || !path || !targetcli ) {
 792                 return false;
 793         }
 794
 795         /* Don't do anything if this is not a DFS root. */
 796
 797         if ( !rootcli->dfsroot) {
 798                 *targetcli = rootcli;
 799                 *pp_targetpath = talloc_strdup(ctx, path);
 800                 if (!*pp_targetpath) {
 801                         return false;
 802                 }
 803                 return true;
 804         }
 805
 806         *targetcli = NULL;
 807
 808         /* Send a trans2_query_path_info to check for a referral. */
 809
 810         cleanpath = clean_path(ctx, path);
 811         if (!cleanpath) {
 812                 return false;
 813         }
 814
 815         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 816         if (!dfs_path) {
 817                 return false;
 818         }
 819
 820         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 821                 /* This is an ordinary path, just return it. */
 822                 *targetcli = rootcli;
 823                 *pp_targetpath = talloc_strdup(ctx, path);
 824                 if (!*pp_targetpath) {
 825                         return false;
 826                 }
 827                 goto done;
 828         }
 829
 830         /* Special case where client asked for a path that does not exist */
 831
 832         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 833                 *targetcli = rootcli;
 834                 *pp_targetpath = talloc_strdup(ctx, path);
 835                 if (!*pp_targetpath) {
 836                         return false;
 837                 }
 838                 goto done;
 839         }
 840
 841         /* We got an error, check for DFS referral. */
 842
 843         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 844                 return false;
 845         }
 846
 847         /* Check for the referral. */
 848
 849         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 850                                         rootcli->desthost,
 851                                         "IPC$", false,
 852                                         (rootcli->trans_enc_state != NULL)))) {
 853                 return false;
 854         }
 855
 856         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 857                         &num_refs, &consumed) || !num_refs) {
 858                 return false;
 859         }
 860
 861         /* Just store the first referral for now. */
 862
 863         if (!refs[0].dfspath) {
 864                 return false;
 865         }
 866         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 867
 868         if (!server || !share) {
 869                 return false;
 870         }
 871
 872         /* Make sure to recreate the original string including any wildcards. */
 873
 874         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 875         if (!dfs_path) {
 876                 return false;
 877         }
 878         pathlen = strlen(dfs_path)*2;
 879         consumed = MIN(pathlen, consumed);
 880         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 881         if (!*pp_targetpath) {
 882                 return false;
 883         }
 884         dfs_path[consumed/2] = '\0';
 885
 886         /*
 887          * *pp_targetpath is now the unconsumed part of the path.
 888          * dfs_path is now the consumed part of the path
 889          * (in \server\share\path format).
 890          */
 891
 892         /* Open the connection to the target server & share */
 893         if ((*targetcli = cli_cm_open(ctx, rootcli,
 894                                         server,
 895                                         share,
 896                                         false,
 897                                         (rootcli->trans_enc_state != NULL))) == NULL) {
 898                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 899                         server, share );
 900                 return false;
 901         }
 902
 903         if (extrapath && strlen(extrapath) > 0) {
 904                 *pp_targetpath = talloc_asprintf(ctx,
 905                                                 "%s%s",
 906                                                 extrapath,
 907                                                 *pp_targetpath);
 908                 if (!*pp_targetpath) {
 909                         return false;
 910                 }
 911         }
 912
 913         /* parse out the consumed mount path */
 914         /* trim off the \server\share\ */
 915
 916         ppath = dfs_path;
 917
 918         if (*ppath != '\\') {
 919                 d_printf("cli_resolve_path: "
 920                         "dfs_path (%s) not in correct format.\n",
 921                         dfs_path );
 922                 return false;
 923         }
 924
 925         ppath++; /* Now pointing at start of server name. */
 926
 927         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 928                 return false;
 929         }
 930
 931         ppath++; /* Now pointing at start of share name. */
 932
 933         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 934                 return false;
 935         }
 936
 937         ppath++; /* Now pointing at path component. */
 938
 939         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 940         if (!newmount) {
 941                 return false;
 942         }
 943
 944         cli_cm_set_mntpoint(*targetcli, newmount);
 945
 946         /* Check for another dfs referral, note that we are not
 947            checking for loops here. */
 948
 949         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 950                 if (cli_resolve_path(ctx,
 951                                         newmount,
 952                                         *targetcli,
 953                                         *pp_targetpath,
 954                                         &newcli,
 955                                         &newpath)) {
 956                         /*
 957                          * When cli_resolve_path returns true here it's always
 958                          * returning the complete path in newpath, so we're done
 959                          * here.
 960                          */
 961                         *targetcli = newcli;
 962                         *pp_targetpath = newpath;
 963                         return true;
 964                 }
 965         }
 966
 967   done:
 968
 969         /* If returning true ensure we return a dfs root full path. */
 970         if ((*targetcli)->dfsroot) {
 971                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 972                 if (!dfs_path) {
 973                         return false;
 974                 }
 975                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 976         }
 977
 978         return true;
 979 }
 980
 981 /********************************************************************
 982 ********************************************************************/
 983
 984 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 985                                 struct cli_state *cli,
 986                                 const char *sharename,
 987                                 char **pp_newserver,
 988                                 char **pp_newshare,
 989                                 bool force_encrypt,
 990                                 const char *username,
 991                                 const char *password,
 992                                 const char *domain)
 993 {
 994         CLIENT_DFS_REFERRAL *refs = NULL;
 995         size_t num_refs = 0;
 996         uint16 consumed;
 997         char *fullpath = NULL;
 998         bool res;
 999         uint16 cnum;
1000         char *newextrapath = NULL;
1001
1002         if (!cli || !sharename) {
1003                 return false;
1004         }
1005
1006         cnum = cli->cnum;
1007
1008         /* special case.  never check for a referral on the IPC$ share */
1009
1010         if (strequal(sharename, "IPC$")) {
1011                 return false;
1012         }
1013
1014         /* send a trans2_query_path_info to check for a referral */
1015
1016         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1017         if (!fullpath) {
1018                 return false;
1019         }
1020
1021         /* check for the referral */
1022
1023         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
1024                 return false;
1025         }
1026
1027         if (force_encrypt) {
1028                 NTSTATUS status = cli_cm_force_encryption(cli,
1029                                         username,
1030                                         password,
1031                                         lp_workgroup(),
1032                                         "IPC$");
1033                 if (!NT_STATUS_IS_OK(status)) {
1034                         return false;
1035                 }
1036         }
1037
1038         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1039
1040         if (!cli_tdis(cli)) {
1041                 return false;
1042         }
1043
1044         cli->cnum = cnum;
1045
1046         if (!res || !num_refs) {
1047                 return false;
1048         }
1049
1050         if (!refs[0].dfspath) {
1051                 return false;
1052         }
1053
1054         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1055                         pp_newshare, &newextrapath );
1056
1057         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1058                 return false;
1059         }
1060
1061         /* check that this is not a self-referral */
1062
1063         if (strequal(cli->desthost, *pp_newserver) &&
1064                         strequal(sharename, *pp_newshare)) {
1065                 return false;
1066         }
1067
1068         return true;
1069 }