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                   2007-2009
   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 #include "libsmb/libsmb.h"
  24 #include "libsmb/clirap.h"
  25 #include "msdfs.h"
  26 #include "trans2.h"
  27 #include "libsmb/nmblib.h"
  28 #include "../libcli/smb/smbXcli_base.h"
  29 #include "auth/credentials/credentials.h"
  30 #include "lib/param/param.h"
  31 #include "libcli/smb/smb2_negotiate_context.h"
  32
  33 /********************************************************************
  34  Important point.
  35
  36  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  37  are not C escaped here).
  38
  39  - but if we're using POSIX paths then <pathname> may contain
  40    '/' separators, not '\\' separators. So cope with '\\' or '/'
  41    as a separator when looking at the pathname part.... JRA.
  42 ********************************************************************/
  43
  44 /********************************************************************
  45  Ensure a connection is encrypted.
  46 ********************************************************************/
  47
  48 static NTSTATUS cli_cm_force_encryption_creds(struct cli_state *c,
  49                                               struct cli_credentials *creds,
  50                                               const char *sharename)
  51 {
  52         uint16_t major, minor;
  53         uint32_t caplow, caphigh;
  54         NTSTATUS status;
  55         bool temp_ipc = false;
  56
  57         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
  58                 status = smb2cli_session_encryption_on(c->smb2.session);
  59                 if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  60                         d_printf("Encryption required and "
  61                                 "server doesn't support "
  62                                 "SMB3 encryption - failing connect\n");
  63                 } else if (!NT_STATUS_IS_OK(status)) {
  64                         d_printf("Encryption required and "
  65                                 "setup failed with error %s.\n",
  66                                 nt_errstr(status));
  67                 }
  68                 return status;
  69         }
  70
  71         if (!SERVER_HAS_UNIX_CIFS(c)) {
  72                 d_printf("Encryption required and "
  73                         "server that doesn't support "
  74                         "UNIX extensions - failing connect\n");
  75                 return NT_STATUS_NOT_SUPPORTED;
  76         }
  77
  78         if (c->smb1.tcon == NULL) {
  79                 status = cli_tree_connect_creds(c, "IPC$", "IPC", creds);
  80                 if (!NT_STATUS_IS_OK(status)) {
  81                         d_printf("Encryption required and "
  82                                 "can't connect to IPC$ to check "
  83                                 "UNIX CIFS extensions.\n");
  84                         return NT_STATUS_UNKNOWN_REVISION;
  85                 }
  86                 temp_ipc = true;
  87         }
  88
  89         status = cli_unix_extensions_version(c, &major, &minor, &caplow,
  90                                              &caphigh);
  91         if (!NT_STATUS_IS_OK(status)) {
  92                 d_printf("Encryption required and "
  93                         "can't get UNIX CIFS extensions "
  94                         "version from server.\n");
  95                 if (temp_ipc) {
  96                         cli_tdis(c);
  97                 }
  98                 return NT_STATUS_UNKNOWN_REVISION;
  99         }
 100
 101         if (!(caplow & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)) {
 102                 d_printf("Encryption required and "
 103                         "share %s doesn't support "
 104                         "encryption.\n", sharename);
 105                 if (temp_ipc) {
 106                         cli_tdis(c);
 107                 }
 108                 return NT_STATUS_UNSUPPORTED_COMPRESSION;
 109         }
 110
 111         status = cli_smb1_setup_encryption(c, creds);
 112         if (!NT_STATUS_IS_OK(status)) {
 113                 d_printf("Encryption required and "
 114                         "setup failed with error %s.\n",
 115                         nt_errstr(status));
 116                 if (temp_ipc) {
 117                         cli_tdis(c);
 118                 }
 119                 return status;
 120         }
 121
 122         if (temp_ipc) {
 123                 cli_tdis(c);
 124         }
 125         return NT_STATUS_OK;
 126 }
 127
 128 /********************************************************************
 129  Return a connection to a server.
 130 ********************************************************************/
 131
 132 static NTSTATUS do_connect(TALLOC_CTX *ctx,
 133                                         const char *server,
 134                                         const char *share,
 135                                         struct cli_credentials *creds,
 136                                         const struct sockaddr_storage *dest_ss,
 137                                         int port,
 138                                         int name_type,
 139                                         struct cli_state **pcli)
 140 {
 141         struct cli_state *c = NULL;
 142         char *servicename;
 143         char *sharename;
 144         char *newserver, *newshare;
 145         NTSTATUS status;
 146         int flags = 0;
 147         enum protocol_types protocol = PROTOCOL_NONE;
 148         enum smb_signing_setting signing_state =
 149                 cli_credentials_get_smb_signing(creds);
 150         enum smb_encryption_setting encryption_state =
 151                 cli_credentials_get_smb_encryption(creds);
 152         struct smb2_negotiate_contexts *in_contexts = NULL;
 153         struct smb2_negotiate_contexts *out_contexts = NULL;
 154
 155         if (encryption_state >= SMB_ENCRYPTION_DESIRED) {
 156                 signing_state = SMB_SIGNING_REQUIRED;
 157         }
 158
 159         /* make a copy so we don't modify the global string 'service' */
 160         servicename = talloc_strdup(ctx,share);
 161         if (!servicename) {
 162                 return NT_STATUS_NO_MEMORY;
 163         }
 164         sharename = servicename;
 165         if (*sharename == '\\') {
 166                 sharename += 2;
 167                 if (server == NULL) {
 168                         server = sharename;
 169                 }
 170                 sharename = strchr_m(sharename,'\\');
 171                 if (!sharename) {
 172                         return NT_STATUS_NO_MEMORY;
 173                 }
 174                 *sharename = 0;
 175                 sharename++;
 176         }
 177         if (server == NULL) {
 178                 return NT_STATUS_INVALID_PARAMETER;
 179         }
 180
 181         /*
 182          * The functions cli_resolve_path() and cli_cm_open() might not create a
 183          * new cli context, but might return an already existing one. This
 184          * forces us to have a long lived cli allocated on the NULL context.
 185          */
 186         status = cli_connect_nb(NULL,
 187                                 server,
 188                                 dest_ss,
 189                                 port,
 190                                 name_type,
 191                                 NULL,
 192                                 signing_state,
 193                                 flags,
 194                                 &c);
 195
 196         if (!NT_STATUS_IS_OK(status)) {
 197                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 198                         DBG_ERR("NetBIOS support disabled, unable to connect\n");
 199                 }
 200
 201                 DBG_WARNING("Connection to %s failed (Error %s)\n",
 202                             server,
 203                             nt_errstr(status));
 204                 return status;
 205         }
 206
 207         DEBUG(4,(" session request ok\n"));
 208
 209         in_contexts = talloc_zero(ctx, struct smb2_negotiate_contexts);
 210         if (in_contexts == NULL) {
 211                 return NT_STATUS_NO_MEMORY;
 212         }
 213
 214         status = smb2_negotiate_context_add(
 215                 in_contexts,
 216                 in_contexts,
 217                 SMB2_POSIX_EXTENSIONS_AVAILABLE,
 218                 (const uint8_t *)SMB2_CREATE_TAG_POSIX,
 219                 strlen(SMB2_CREATE_TAG_POSIX));
 220         if (!NT_STATUS_IS_OK(status)) {
 221                 return status;
 222         }
 223
 224         status = smbXcli_negprot(c->conn,
 225                                  c->timeout,
 226                                  lp_client_min_protocol(),
 227                                  lp_client_max_protocol(),
 228                                  in_contexts,
 229                                  ctx,
 230                                  &out_contexts);
 231         TALLOC_FREE(in_contexts);
 232
 233         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 234                 d_printf("Protocol negotiation (with timeout %d ms) timed out against server %s\n",
 235                          c->timeout,
 236                          smbXcli_conn_remote_name(c->conn));
 237                 cli_shutdown(c);
 238                 return status;
 239         } else if (!NT_STATUS_IS_OK(status)) {
 240                 d_printf("Protocol negotiation to server %s (for a protocol between %s and %s) failed: %s\n",
 241                          smbXcli_conn_remote_name(c->conn),
 242                          lpcfg_get_smb_protocol(lp_client_min_protocol()),
 243                          lpcfg_get_smb_protocol(lp_client_max_protocol()),
 244                          nt_errstr(status));
 245                 cli_shutdown(c);
 246                 return status;
 247         }
 248         protocol = smbXcli_conn_protocol(c->conn);
 249         DEBUG(4,(" negotiated dialect[%s] against server[%s]\n",
 250                  smb_protocol_types_string(protocol),
 251                  smbXcli_conn_remote_name(c->conn)));
 252
 253         if (protocol >= PROTOCOL_SMB2_02) {
 254                 /* Ensure we ask for some initial credits. */
 255                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 256         }
 257
 258         status = cli_session_setup_creds(c, creds);
 259         if (!NT_STATUS_IS_OK(status)) {
 260                 /* If a password was not supplied then
 261                  * try again with a null username. */
 262                 if (encryption_state == SMB_ENCRYPTION_REQUIRED ||
 263                         smbXcli_conn_signing_mandatory(c->conn) ||
 264                         cli_credentials_authentication_requested(creds) ||
 265                         cli_credentials_is_anonymous(creds) ||
 266                         !NT_STATUS_IS_OK(status = cli_session_setup_anon(c)))
 267                 {
 268                         d_printf("session setup failed: %s\n",
 269                                  nt_errstr(status));
 270                         if (NT_STATUS_EQUAL(status,
 271                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 272                                 d_printf("did you forget to run kinit?\n");
 273                         cli_shutdown(c);
 274                         return status;
 275                 }
 276                 d_printf("Anonymous login successful\n");
 277         }
 278
 279         if (!NT_STATUS_IS_OK(status)) {
 280                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 281                 cli_shutdown(c);
 282                 return status;
 283         }
 284
 285         DEBUG(4,(" session setup ok\n"));
 286
 287         if (encryption_state >= SMB_ENCRYPTION_DESIRED) {
 288                 status = cli_cm_force_encryption_creds(c,
 289                                                        creds,
 290                                                        sharename);
 291                 if (!NT_STATUS_IS_OK(status)) {
 292                         switch (encryption_state) {
 293                         case SMB_ENCRYPTION_DESIRED:
 294                                 break;
 295                         case SMB_ENCRYPTION_REQUIRED:
 296                         default:
 297                                 cli_shutdown(c);
 298                                 return status;
 299                         }
 300                 }
 301         }
 302
 303         /* here's the fun part....to support 'msdfs proxy' shares
 304            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 305            here before trying to connect to the original share.
 306            cli_check_msdfs_proxy() will fail if it is a normal share. */
 307
 308         if (smbXcli_conn_dfs_supported(c->conn) &&
 309                         cli_check_msdfs_proxy(ctx, c, sharename,
 310                                 &newserver, &newshare,
 311                                 creds)) {
 312                 cli_shutdown(c);
 313                 return do_connect(ctx, newserver,
 314                                 newshare, creds,
 315                                 NULL, port, name_type, pcli);
 316         }
 317
 318         /* must be a normal share */
 319
 320         status = cli_tree_connect_creds(c, sharename, "?????", creds);
 321         if (!NT_STATUS_IS_OK(status)) {
 322                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 323                 cli_shutdown(c);
 324                 return status;
 325         }
 326
 327         DEBUG(4,(" tconx ok\n"));
 328         *pcli = c;
 329         return NT_STATUS_OK;
 330 }
 331
 332 /********************************************************************
 333  Add a new connection to the list.
 334  referring_cli == NULL means a new initial connection.
 335 ********************************************************************/
 336
 337 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 338                                struct cli_state *referring_cli,
 339                                const char *server,
 340                                const char *share,
 341                                struct cli_credentials *creds,
 342                                const struct sockaddr_storage *dest_ss,
 343                                int port,
 344                                int name_type,
 345                                struct cli_state **pcli)
 346 {
 347         struct cli_state *cli = NULL;
 348         NTSTATUS status;
 349
 350         status = do_connect(ctx, server, share,
 351                                 creds,
 352                                 dest_ss, port, name_type, &cli);
 353
 354         if (!NT_STATUS_IS_OK(status)) {
 355                 return status;
 356         }
 357
 358         /*
 359          * This can't happen, this test is to satisfy static
 360          * checkers (clang)
 361          */
 362         if (cli == NULL) {
 363                 return NT_STATUS_NO_MEMORY;
 364         }
 365
 366         /* Enter into the list. */
 367         if (referring_cli) {
 368                 DLIST_ADD_END(referring_cli, cli);
 369         }
 370
 371         if (referring_cli && referring_cli->requested_posix_capabilities) {
 372                 uint16_t major, minor;
 373                 uint32_t caplow, caphigh;
 374                 status = cli_unix_extensions_version(cli, &major, &minor,
 375                                                      &caplow, &caphigh);
 376                 if (NT_STATUS_IS_OK(status)) {
 377                         cli_set_unix_extensions_capabilities(cli,
 378                                         major, minor,
 379                                         caplow, caphigh);
 380                 }
 381         }
 382
 383         *pcli = cli;
 384         return NT_STATUS_OK;
 385 }
 386
 387 /********************************************************************
 388  Return a connection to a server on a particular share.
 389 ********************************************************************/
 390
 391 static struct cli_state *cli_cm_find(struct cli_state *cli,
 392                                 const char *server,
 393                                 const char *share)
 394 {
 395         struct cli_state *p;
 396
 397         if (cli == NULL) {
 398                 return NULL;
 399         }
 400
 401         /* Search to the start of the list. */
 402         for (p = cli; p; p = DLIST_PREV(p)) {
 403                 const char *remote_name =
 404                         smbXcli_conn_remote_name(p->conn);
 405
 406                 if (strequal(server, remote_name) &&
 407                                 strequal(share,p->share)) {
 408                         return p;
 409                 }
 410         }
 411
 412         /* Search to the end of the list. */
 413         for (p = cli->next; p; p = p->next) {
 414                 const char *remote_name =
 415                         smbXcli_conn_remote_name(p->conn);
 416
 417                 if (strequal(server, remote_name) &&
 418                                 strequal(share,p->share)) {
 419                         return p;
 420                 }
 421         }
 422
 423         return NULL;
 424 }
 425
 426 /****************************************************************************
 427  Open a client connection to a \\server\share.
 428 ****************************************************************************/
 429
 430 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 431                      struct cli_state *referring_cli,
 432                      const char *server,
 433                      const char *share,
 434                      struct cli_credentials *creds,
 435                      const struct sockaddr_storage *dest_ss,
 436                      int port,
 437                      int name_type,
 438                      struct cli_state **pcli)
 439 {
 440         /* Try to reuse an existing connection in this list. */
 441         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 442         NTSTATUS status;
 443
 444         if (c) {
 445                 *pcli = c;
 446                 return NT_STATUS_OK;
 447         }
 448
 449         if (creds == NULL) {
 450                 /* Can't do a new connection
 451                  * without auth info. */
 452                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 453                         "without client credentials\n",
 454                         server, share );
 455                 return NT_STATUS_INVALID_PARAMETER;
 456         }
 457
 458         status = cli_cm_connect(ctx,
 459                                 referring_cli,
 460                                 server,
 461                                 share,
 462                                 creds,
 463                                 dest_ss,
 464                                 port,
 465                                 name_type,
 466                                 &c);
 467         if (!NT_STATUS_IS_OK(status)) {
 468                 return status;
 469         }
 470         *pcli = c;
 471         return NT_STATUS_OK;
 472 }
 473
 474 /****************************************************************************
 475 ****************************************************************************/
 476
 477 void cli_cm_display(struct cli_state *cli)
 478 {
 479         int i;
 480
 481         for (i=0; cli; cli = cli->next,i++ ) {
 482                 d_printf("%d:\tserver=%s, share=%s\n",
 483                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 484         }
 485 }
 486
 487 /**********************************************************************
 488  split a dfs path into the server, share name, and extrapath components
 489 **********************************************************************/
 490
 491 static bool split_dfs_path(TALLOC_CTX *ctx,
 492                                 const char *nodepath,
 493                                 char **pp_server,
 494                                 char **pp_share,
 495                                 char **pp_extrapath)
 496 {
 497         char *p, *q;
 498         char *path;
 499
 500         *pp_server = NULL;
 501         *pp_share = NULL;
 502         *pp_extrapath = NULL;
 503
 504         path = talloc_strdup(ctx, nodepath);
 505         if (!path) {
 506                 goto fail;
 507         }
 508
 509         if ( path[0] != '\\' ) {
 510                 goto fail;
 511         }
 512
 513         p = strchr_m( path + 1, '\\' );
 514         if ( !p ) {
 515                 goto fail;
 516         }
 517
 518         *p = '\0';
 519         p++;
 520
 521         /* Look for any extra/deep path */
 522         q = strchr_m(p, '\\');
 523         if (q != NULL) {
 524                 *q = '\0';
 525                 q++;
 526                 *pp_extrapath = talloc_strdup(ctx, q);
 527         } else {
 528                 *pp_extrapath = talloc_strdup(ctx, "");
 529         }
 530         if (*pp_extrapath == NULL) {
 531                 goto fail;
 532         }
 533
 534         *pp_share = talloc_strdup(ctx, p);
 535         if (*pp_share == NULL) {
 536                 goto fail;
 537         }
 538
 539         *pp_server = talloc_strdup(ctx, &path[1]);
 540         if (*pp_server == NULL) {
 541                 goto fail;
 542         }
 543
 544         TALLOC_FREE(path);
 545         return true;
 546
 547 fail:
 548         TALLOC_FREE(*pp_share);
 549         TALLOC_FREE(*pp_extrapath);
 550         TALLOC_FREE(path);
 551         return false;
 552 }
 553
 554 /****************************************************************************
 555  Return the original path truncated at the directory component before
 556  the first wildcard character. Trust the caller to provide a NULL
 557  terminated string
 558 ****************************************************************************/
 559
 560 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 561 {
 562         size_t len;
 563         char *p1, *p2, *p;
 564         char *path_out;
 565
 566         /* No absolute paths. */
 567         while (IS_DIRECTORY_SEP(*path)) {
 568                 path++;
 569         }
 570
 571         path_out = talloc_strdup(ctx, path);
 572         if (!path_out) {
 573                 return NULL;
 574         }
 575
 576         p1 = strchr_m(path_out, '*');
 577         p2 = strchr_m(path_out, '?');
 578
 579         if (p1 || p2) {
 580                 if (p1 && p2) {
 581                         p = MIN(p1,p2);
 582                 } else if (!p1) {
 583                         p = p2;
 584                 } else {
 585                         p = p1;
 586                 }
 587                 *p = '\0';
 588
 589                 /* Now go back to the start of this component. */
 590                 p1 = strrchr_m(path_out, '/');
 591                 p2 = strrchr_m(path_out, '\\');
 592                 p = MAX(p1,p2);
 593                 if (p) {
 594                         *p = '\0';
 595                 }
 596         }
 597
 598         /* Strip any trailing separator */
 599
 600         len = strlen(path_out);
 601         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 602                 path_out[len-1] = '\0';
 603         }
 604
 605         return path_out;
 606 }
 607
 608 /****************************************************************************
 609 ****************************************************************************/
 610
 611 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 612                                         struct cli_state *cli,
 613                                         const char *dir)
 614 {
 615         char path_sep = '\\';
 616
 617         /* Ensure the extrapath doesn't start with a separator. */
 618         while (IS_DIRECTORY_SEP(*dir)) {
 619                 dir++;
 620         }
 621
 622         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 623                 path_sep = '/';
 624         }
 625         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 626                         path_sep,
 627                         smbXcli_conn_remote_name(cli->conn),
 628                         path_sep,
 629                         cli->share,
 630                         path_sep,
 631                         dir);
 632 }
 633
 634 /********************************************************************
 635  Check if a path has already been converted to DFS.
 636 ********************************************************************/
 637
 638 bool cli_dfs_is_already_full_path(struct cli_state *cli, const char *path)
 639 {
 640         const char *server = smbXcli_conn_remote_name(cli->conn);
 641         size_t server_len = strlen(server);
 642         bool found_server = false;
 643         const char *share = cli->share;
 644         size_t share_len = strlen(share);
 645         bool found_share = false;
 646
 647         if (!IS_DIRECTORY_SEP(path[0])) {
 648                 return false;
 649         }
 650         path++;
 651         found_server = (strncasecmp_m(path, server, server_len) == 0);
 652         if (!found_server) {
 653                 return false;
 654         }
 655         path += server_len;
 656         if (!IS_DIRECTORY_SEP(path[0])) {
 657                 return false;
 658         }
 659         path++;
 660         found_share = (strncasecmp_m(path, share, share_len) == 0);
 661         if (!found_share) {
 662                 return false;
 663         }
 664         path += share_len;
 665         if (path[0] == '\0') {
 666                 return true;
 667         }
 668         if (IS_DIRECTORY_SEP(path[0])) {
 669                 return true;
 670         }
 671         return false;
 672 }
 673
 674 /********************************************************************
 675  Get the dfs referral link.
 676 ********************************************************************/
 677
 678 NTSTATUS cli_dfs_get_referral_ex(TALLOC_CTX *ctx,
 679                         struct cli_state *cli,
 680                         const char *path,
 681                         uint16_t max_referral_level,
 682                         struct client_dfs_referral **refs,
 683                         size_t *num_refs,
 684                         size_t *consumed)
 685 {
 686         unsigned int param_len = 0;
 687         uint16_t recv_flags2;
 688         uint8_t *param = NULL;
 689         uint8_t *rdata = NULL;
 690         char *p;
 691         char *endp;
 692         smb_ucs2_t *path_ucs;
 693         char *consumed_path = NULL;
 694         uint16_t consumed_ucs;
 695         uint16_t num_referrals;
 696         struct client_dfs_referral *referrals = NULL;
 697         NTSTATUS status;
 698         TALLOC_CTX *frame = talloc_stackframe();
 699
 700         *num_refs = 0;
 701         *refs = NULL;
 702
 703         param = talloc_array(talloc_tos(), uint8_t, 2);
 704         if (!param) {
 705                 status = NT_STATUS_NO_MEMORY;
 706                 goto out;
 707         }
 708         SSVAL(param, 0, max_referral_level);
 709
 710         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 711                                       path, strlen(path)+1,
 712                                       NULL);
 713         if (!param) {
 714                 status = NT_STATUS_NO_MEMORY;
 715                 goto out;
 716         }
 717         param_len = talloc_get_size(param);
 718         path_ucs = (smb_ucs2_t *)&param[2];
 719
 720         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
 721                 DATA_BLOB in_input_buffer;
 722                 DATA_BLOB in_output_buffer = data_blob_null;
 723                 DATA_BLOB out_input_buffer = data_blob_null;
 724                 DATA_BLOB out_output_buffer = data_blob_null;
 725
 726                 in_input_buffer.data = param;
 727                 in_input_buffer.length = param_len;
 728
 729                 status = smb2cli_ioctl(cli->conn,
 730                                        cli->timeout,
 731                                        cli->smb2.session,
 732                                        cli->smb2.tcon,
 733                                        UINT64_MAX, /* in_fid_persistent */
 734                                        UINT64_MAX, /* in_fid_volatile */
 735                                        FSCTL_DFS_GET_REFERRALS,
 736                                        0, /* in_max_input_length */
 737                                        &in_input_buffer,
 738                                        CLI_BUFFER_SIZE, /* in_max_output_length */
 739                                        &in_output_buffer,
 740                                        SMB2_IOCTL_FLAG_IS_FSCTL,
 741                                        talloc_tos(),
 742                                        &out_input_buffer,
 743                                        &out_output_buffer);
 744                 if (!NT_STATUS_IS_OK(status)) {
 745                         goto out;
 746                 }
 747
 748                 if (out_output_buffer.length < 4) {
 749                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 750                         goto out;
 751                 }
 752
 753                 recv_flags2 = FLAGS2_UNICODE_STRINGS;
 754                 rdata = out_output_buffer.data;
 755                 endp = (char *)rdata + out_output_buffer.length;
 756         } else {
 757                 unsigned int data_len = 0;
 758                 uint16_t setup[1];
 759
 760                 SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 761
 762                 status = cli_trans(talloc_tos(), cli, SMBtrans2,
 763                                    NULL, 0xffff, 0, 0,
 764                                    setup, 1, 0,
 765                                    param, param_len, 2,
 766                                    NULL, 0, CLI_BUFFER_SIZE,
 767                                    &recv_flags2,
 768                                    NULL, 0, NULL, /* rsetup */
 769                                    NULL, 0, NULL,
 770                                    &rdata, 4, &data_len);
 771                 if (!NT_STATUS_IS_OK(status)) {
 772                         goto out;
 773                 }
 774
 775                 endp = (char *)rdata + data_len;
 776         }
 777
 778         consumed_ucs  = SVAL(rdata, 0);
 779         num_referrals = SVAL(rdata, 2);
 780
 781         /* consumed_ucs is the number of bytes
 782          * of the UCS2 path consumed not counting any
 783          * terminating null. We need to convert
 784          * back to unix charset and count again
 785          * to get the number of bytes consumed from
 786          * the incoming path. */
 787
 788         errno = 0;
 789         if (pull_string_talloc(talloc_tos(),
 790                         NULL,
 791                         0,
 792                         &consumed_path,
 793                         path_ucs,
 794                         consumed_ucs,
 795                         STR_UNICODE) == 0) {
 796                 if (errno != 0) {
 797                         status = map_nt_error_from_unix(errno);
 798                 } else {
 799                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 800                 }
 801                 goto out;
 802         }
 803         if (consumed_path == NULL) {
 804                 status = map_nt_error_from_unix(errno);
 805                 goto out;
 806         }
 807         *consumed = strlen(consumed_path);
 808
 809         if (num_referrals != 0) {
 810                 uint16_t ref_version;
 811                 uint16_t ref_size;
 812                 int i;
 813                 uint16_t node_offset;
 814
 815                 referrals = talloc_array(ctx, struct client_dfs_referral,
 816                                          num_referrals);
 817
 818                 if (!referrals) {
 819                         status = NT_STATUS_NO_MEMORY;
 820                         goto out;
 821                 }
 822                 /* start at the referrals array */
 823
 824                 p = (char *)rdata+8;
 825                 for (i=0; i<num_referrals && p < endp; i++) {
 826                         if (p + 18 > endp) {
 827                                 goto out;
 828                         }
 829                         ref_version = SVAL(p, 0);
 830                         ref_size    = SVAL(p, 2);
 831                         node_offset = SVAL(p, 16);
 832
 833                         if (ref_version != 3) {
 834                                 p += ref_size;
 835                                 continue;
 836                         }
 837
 838                         referrals[i].proximity = SVAL(p, 8);
 839                         referrals[i].ttl       = SVAL(p, 10);
 840
 841                         if (p + node_offset > endp) {
 842                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 843                                 goto out;
 844                         }
 845                         pull_string_talloc(referrals,
 846                                            (const char *)rdata,
 847                                            recv_flags2,
 848                                            &referrals[i].dfspath,
 849                                            p+node_offset,
 850                                            PTR_DIFF(endp, p+node_offset),
 851                                            STR_TERMINATE|STR_UNICODE);
 852
 853                         if (!referrals[i].dfspath) {
 854                                 status = map_nt_error_from_unix(errno);
 855                                 goto out;
 856                         }
 857                         p += ref_size;
 858                 }
 859                 if (i < num_referrals) {
 860                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 861                         goto out;
 862                 }
 863         }
 864
 865         *num_refs = num_referrals;
 866         *refs = referrals;
 867
 868   out:
 869
 870         TALLOC_FREE(frame);
 871         return status;
 872 }
 873
 874 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 875                         struct cli_state *cli,
 876                         const char *path,
 877                         struct client_dfs_referral **refs,
 878                         size_t *num_refs,
 879                         size_t *consumed)
 880 {
 881         return cli_dfs_get_referral_ex(ctx,
 882                                 cli,
 883                                 path,
 884                                 3,
 885                                 refs, /* Max referral level we want */
 886                                 num_refs,
 887                                 consumed);
 888 }
 889
 890 static bool cli_conn_have_dfs(struct cli_state *cli)
 891 {
 892         struct smbXcli_conn *conn = cli->conn;
 893         struct smbXcli_tcon *tcon = NULL;
 894         bool ok;
 895
 896         if (smbXcli_conn_protocol(conn) < PROTOCOL_SMB2_02) {
 897                 uint32_t capabilities = smb1cli_conn_capabilities(conn);
 898
 899                 if ((capabilities & CAP_STATUS32) == 0) {
 900                         return false;
 901                 }
 902                 if ((capabilities & CAP_UNICODE) == 0) {
 903                         return false;
 904                 }
 905
 906                 tcon = cli->smb1.tcon;
 907         } else {
 908                 tcon = cli->smb2.tcon;
 909         }
 910
 911         ok = smbXcli_tcon_is_dfs_share(tcon);
 912         return ok;
 913 }
 914
 915 /********************************************************************
 916 ********************************************************************/
 917 struct cli_dfs_path_split {
 918         char *server;
 919         char *share;
 920         char *extrapath;
 921 };
 922
 923 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 924                           const char *mountpt,
 925                           struct cli_credentials *creds,
 926                           struct cli_state *rootcli,
 927                           const char *path,
 928                           struct cli_state **targetcli,
 929                           char **pp_targetpath)
 930 {
 931         struct client_dfs_referral *refs = NULL;
 932         size_t num_refs = 0;
 933         size_t consumed = 0;
 934         struct cli_state *cli_ipc = NULL;
 935         char *dfs_path = NULL;
 936         char *cleanpath = NULL;
 937         char *extrapath = NULL;
 938         int pathlen;
 939         struct cli_state *newcli = NULL;
 940         struct cli_state *ccli = NULL;
 941         size_t count = 0;
 942         char *newpath = NULL;
 943         char *newmount = NULL;
 944         char *ppath = NULL;
 945         SMB_STRUCT_STAT sbuf;
 946         uint32_t attributes;
 947         NTSTATUS status;
 948         struct smbXcli_tcon *target_tcon = NULL;
 949         struct cli_dfs_path_split *dfs_refs = NULL;
 950         bool ok;
 951         bool is_already_dfs = false;
 952
 953         if ( !rootcli || !path || !targetcli ) {
 954                 return NT_STATUS_INVALID_PARAMETER;
 955         }
 956
 957         /*
 958          * Avoid more than one leading directory separator
 959          */
 960         while (IS_DIRECTORY_SEP(path[0]) && IS_DIRECTORY_SEP(path[1])) {
 961                 path++;
 962         }
 963
 964         ok = cli_conn_have_dfs(rootcli);
 965         if (!ok) {
 966                 *targetcli = rootcli;
 967                 *pp_targetpath = talloc_strdup(ctx, path);
 968                 if (!*pp_targetpath) {
 969                         return NT_STATUS_NO_MEMORY;
 970                 }
 971                 return NT_STATUS_OK;
 972         }
 973
 974         *targetcli = NULL;
 975
 976         is_already_dfs = cli_dfs_is_already_full_path(rootcli, path);
 977         if (is_already_dfs) {
 978                 const char *localpath = NULL;
 979                 /*
 980                  * Given path is already converted to DFS.
 981                  * Convert to a local path so clean_path()
 982                  * can correctly strip any wildcards.
 983                  */
 984                 status = cli_dfs_target_check(ctx,
 985                                               rootcli,
 986                                               path,
 987                                               &localpath);
 988                 if (!NT_STATUS_IS_OK(status)) {
 989                         return status;
 990                 }
 991                 path = localpath;
 992         }
 993
 994         /* Send a trans2_query_path_info to check for a referral. */
 995
 996         cleanpath = clean_path(ctx, path);
 997         if (!cleanpath) {
 998                 return NT_STATUS_NO_MEMORY;
 999         }
1000
1001         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
1002         if (!dfs_path) {
1003                 return NT_STATUS_NO_MEMORY;
1004         }
1005
1006         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
1007         if (NT_STATUS_IS_OK(status)) {
1008                 /* This is an ordinary path, just return it. */
1009                 *targetcli = rootcli;
1010                 *pp_targetpath = talloc_strdup(ctx, path);
1011                 if (!*pp_targetpath) {
1012                         return NT_STATUS_NO_MEMORY;
1013                 }
1014                 goto done;
1015         }
1016
1017         /* Special case where client asked for a path that does not exist */
1018
1019         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1020                 *targetcli = rootcli;
1021                 *pp_targetpath = talloc_strdup(ctx, path);
1022                 if (!*pp_targetpath) {
1023                         return NT_STATUS_NO_MEMORY;
1024                 }
1025                 goto done;
1026         }
1027
1028         /* We got an error, check for DFS referral. */
1029
1030         if (!NT_STATUS_EQUAL(status, NT_STATUS_PATH_NOT_COVERED)) {
1031                 return status;
1032         }
1033
1034         /* Check for the referral. */
1035
1036         status = cli_cm_open(ctx,
1037                              rootcli,
1038                              smbXcli_conn_remote_name(rootcli->conn),
1039                              "IPC$",
1040                              creds,
1041                              NULL, /* dest_ss not needed, we reuse the transport */
1042                              0,
1043                              0x20,
1044                              &cli_ipc);
1045         if (!NT_STATUS_IS_OK(status)) {
1046                 return status;
1047         }
1048
1049         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
1050                                       &num_refs, &consumed);
1051         if (!NT_STATUS_IS_OK(status)) {
1052                 return status;
1053         }
1054
1055         if (!num_refs || !refs[0].dfspath) {
1056                 return NT_STATUS_NOT_FOUND;
1057         }
1058
1059         /*
1060          * Bug#10123 - DFS referral entries can be provided in a random order,
1061          * so check the connection cache for each item to avoid unnecessary
1062          * reconnections.
1063          */
1064         dfs_refs = talloc_array(ctx, struct cli_dfs_path_split, num_refs);
1065         if (dfs_refs == NULL) {
1066                 return NT_STATUS_NO_MEMORY;
1067         }
1068
1069         for (count = 0; count < num_refs; count++) {
1070                 if (!split_dfs_path(dfs_refs, refs[count].dfspath,
1071                                     &dfs_refs[count].server,
1072                                     &dfs_refs[count].share,
1073                                     &dfs_refs[count].extrapath)) {
1074                         TALLOC_FREE(dfs_refs);
1075                         return NT_STATUS_NOT_FOUND;
1076                 }
1077
1078                 ccli = cli_cm_find(rootcli, dfs_refs[count].server,
1079                                    dfs_refs[count].share);
1080                 if (ccli != NULL) {
1081                         extrapath = dfs_refs[count].extrapath;
1082                         *targetcli = ccli;
1083                         break;
1084                 }
1085         }
1086
1087         /*
1088          * If no cached connection was found, then connect to the first live
1089          * referral server in the list.
1090          */
1091         for (count = 0; (ccli == NULL) && (count < num_refs); count++) {
1092                 /* Connect to the target server & share */
1093                 status = cli_cm_connect(ctx, rootcli,
1094                                 dfs_refs[count].server,
1095                                 dfs_refs[count].share,
1096                                 creds,
1097                                 NULL, /* dest_ss */
1098                                 0, /* port */
1099                                 0x20,
1100                                 targetcli);
1101                 if (!NT_STATUS_IS_OK(status)) {
1102                         d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
1103                                  dfs_refs[count].server,
1104                                  dfs_refs[count].share);
1105                         continue;
1106                 } else {
1107                         extrapath = dfs_refs[count].extrapath;
1108                         break;
1109                 }
1110         }
1111
1112         /* No available referral server for the connection */
1113         if (*targetcli == NULL) {
1114                 TALLOC_FREE(dfs_refs);
1115                 return status;
1116         }
1117
1118         /* Make sure to recreate the original string including any wildcards. */
1119
1120         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
1121         if (!dfs_path) {
1122                 TALLOC_FREE(dfs_refs);
1123                 return NT_STATUS_NO_MEMORY;
1124         }
1125         pathlen = strlen(dfs_path);
1126         consumed = MIN(pathlen, consumed);
1127         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
1128         if (!*pp_targetpath) {
1129                 TALLOC_FREE(dfs_refs);
1130                 return NT_STATUS_NO_MEMORY;
1131         }
1132         dfs_path[consumed] = '\0';
1133
1134         /*
1135          * *pp_targetpath is now the unconsumed part of the path.
1136          * dfs_path is now the consumed part of the path
1137          * (in \server\share\path format).
1138          */
1139
1140         if (extrapath && strlen(extrapath) > 0) {
1141                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
1142                 /* put the trailing \ on the path, so to be safe we put one in if needed */
1143                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
1144                         *pp_targetpath = talloc_asprintf(ctx,
1145                                                   "%s\\%s",
1146                                                   extrapath,
1147                                                   *pp_targetpath);
1148                 } else {
1149                         *pp_targetpath = talloc_asprintf(ctx,
1150                                                   "%s%s",
1151                                                   extrapath,
1152                                                   *pp_targetpath);
1153                 }
1154                 if (!*pp_targetpath) {
1155                         TALLOC_FREE(dfs_refs);
1156                         return NT_STATUS_NO_MEMORY;
1157                 }
1158         }
1159
1160         /* parse out the consumed mount path */
1161         /* trim off the \server\share\ */
1162
1163         ppath = dfs_path;
1164
1165         if (*ppath != '\\') {
1166                 d_printf("cli_resolve_path: "
1167                         "dfs_path (%s) not in correct format.\n",
1168                         dfs_path );
1169                 TALLOC_FREE(dfs_refs);
1170                 return NT_STATUS_NOT_FOUND;
1171         }
1172
1173         ppath++; /* Now pointing at start of server name. */
1174
1175         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
1176                 TALLOC_FREE(dfs_refs);
1177                 return NT_STATUS_NOT_FOUND;
1178         }
1179
1180         ppath++; /* Now pointing at start of share name. */
1181
1182         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1183                 TALLOC_FREE(dfs_refs);
1184                 return NT_STATUS_NOT_FOUND;
1185         }
1186
1187         ppath++; /* Now pointing at path component. */
1188
1189         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1190         if (!newmount) {
1191                 TALLOC_FREE(dfs_refs);
1192                 return NT_STATUS_NOT_FOUND;
1193         }
1194
1195         /* Check for another dfs referral, note that we are not
1196            checking for loops here. */
1197
1198         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1199                 status = cli_resolve_path(ctx,
1200                                           newmount,
1201                                           creds,
1202                                           *targetcli,
1203                                           *pp_targetpath,
1204                                           &newcli,
1205                                           &newpath);
1206                 if (NT_STATUS_IS_OK(status)) {
1207                         /*
1208                          * When cli_resolve_path returns true here it's always
1209                          * returning the complete path in newpath, so we're done
1210                          * here.
1211                          */
1212                         *targetcli = newcli;
1213                         *pp_targetpath = newpath;
1214                         TALLOC_FREE(dfs_refs);
1215                         return status;
1216                 }
1217         }
1218
1219   done:
1220
1221         if (smbXcli_conn_protocol((*targetcli)->conn) >= PROTOCOL_SMB2_02) {
1222                 target_tcon = (*targetcli)->smb2.tcon;
1223         } else {
1224                 target_tcon = (*targetcli)->smb1.tcon;
1225         }
1226
1227         /* If returning true ensure we return a dfs root full path. */
1228         if (smbXcli_tcon_is_dfs_share(target_tcon)) {
1229                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1230                 if (!dfs_path) {
1231                         TALLOC_FREE(dfs_refs);
1232                         return NT_STATUS_NO_MEMORY;
1233                 }
1234                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1235                 if (*pp_targetpath == NULL) {
1236                         TALLOC_FREE(dfs_refs);
1237                         return NT_STATUS_NO_MEMORY;
1238                 }
1239         }
1240
1241         TALLOC_FREE(dfs_refs);
1242         return NT_STATUS_OK;
1243 }
1244
1245 /********************************************************************
1246 ********************************************************************/
1247
1248 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1249                                 struct cli_state *cli,
1250                                 const char *sharename,
1251                                 char **pp_newserver,
1252                                 char **pp_newshare,
1253                                 struct cli_credentials *creds)
1254 {
1255         struct client_dfs_referral *refs = NULL;
1256         size_t num_refs = 0;
1257         size_t consumed = 0;
1258         char *fullpath = NULL;
1259         bool res;
1260         struct smbXcli_tcon *orig_tcon = NULL;
1261         char *orig_share = NULL;
1262         char *newextrapath = NULL;
1263         NTSTATUS status;
1264         const char *remote_name;
1265         enum smb_encryption_setting encryption_state =
1266                 cli_credentials_get_smb_encryption(creds);
1267
1268         if (!cli || !sharename) {
1269                 return false;
1270         }
1271
1272         remote_name = smbXcli_conn_remote_name(cli->conn);
1273
1274         /* special case.  never check for a referral on the IPC$ share */
1275
1276         if (strequal(sharename, "IPC$")) {
1277                 return false;
1278         }
1279
1280         /* send a trans2_query_path_info to check for a referral */
1281
1282         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1283         if (!fullpath) {
1284                 return false;
1285         }
1286
1287         /* Store tcon state. */
1288         if (cli_state_has_tcon(cli)) {
1289                 cli_state_save_tcon_share(cli, &orig_tcon, &orig_share);
1290         }
1291
1292         /* check for the referral */
1293
1294         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL))) {
1295                 cli_state_restore_tcon_share(cli, orig_tcon, orig_share);
1296                 return false;
1297         }
1298
1299         if (encryption_state >= SMB_ENCRYPTION_DESIRED) {
1300                 status = cli_cm_force_encryption_creds(cli, creds, "IPC$");
1301                 if (!NT_STATUS_IS_OK(status)) {
1302                         switch (encryption_state) {
1303                         case SMB_ENCRYPTION_DESIRED:
1304                                 break;
1305                         case SMB_ENCRYPTION_REQUIRED:
1306                         default:
1307                                 /*
1308                                  * Failed to set up encryption.
1309                                  * Disconnect the temporary IPC$
1310                                  * tcon before restoring the original
1311                                  * tcon so we don't leak it.
1312                                  */
1313                                 cli_tdis(cli);
1314                                 cli_state_restore_tcon_share(cli,
1315                                                              orig_tcon,
1316                                                              orig_share);
1317                                 return false;
1318                         }
1319                 }
1320         }
1321
1322         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1323                                       &num_refs, &consumed);
1324         res = NT_STATUS_IS_OK(status);
1325
1326         status = cli_tdis(cli);
1327
1328         cli_state_restore_tcon_share(cli, orig_tcon, orig_share);
1329
1330         if (!NT_STATUS_IS_OK(status)) {
1331                 return false;
1332         }
1333
1334         if (!res || !num_refs) {
1335                 return false;
1336         }
1337
1338         if (!refs[0].dfspath) {
1339                 return false;
1340         }
1341
1342         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1343                             pp_newshare, &newextrapath)) {
1344                 return false;
1345         }
1346
1347         /* check that this is not a self-referral */
1348
1349         if (strequal(remote_name, *pp_newserver) &&
1350                         strequal(sharename, *pp_newshare)) {
1351                 return false;
1352         }
1353
1354         return true;
1355 }
1356
1357 /********************************************************************
1358  Windows and NetApp (and arguably the SMB1/2/3 specs) expect a non-DFS
1359  path for the targets of rename and hardlink. If we have been given
1360  a DFS path for these calls, convert it back into a local path by
1361  stripping off the DFS prefix.
1362 ********************************************************************/
1363
1364 NTSTATUS cli_dfs_target_check(TALLOC_CTX *mem_ctx,
1365                         struct cli_state *cli,
1366                         const char *fname_dst,
1367                         const char **fname_dst_out)
1368 {
1369         char *dfs_prefix = NULL;
1370         size_t prefix_len = 0;
1371         struct smbXcli_tcon *tcon = NULL;
1372
1373         if (!smbXcli_conn_dfs_supported(cli->conn)) {
1374                 goto copy_fname_out;
1375         }
1376         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
1377                 tcon = cli->smb2.tcon;
1378         } else {
1379                 tcon = cli->smb1.tcon;
1380         }
1381         if (!smbXcli_tcon_is_dfs_share(tcon)) {
1382                 goto copy_fname_out;
1383         }
1384         dfs_prefix = cli_dfs_make_full_path(mem_ctx, cli, "");
1385         if (dfs_prefix == NULL) {
1386                 return NT_STATUS_NO_MEMORY;
1387         }
1388         prefix_len = strlen(dfs_prefix);
1389         if (strncmp(fname_dst, dfs_prefix, prefix_len) != 0) {
1390                 /*
1391                  * Prefix doesn't match. Assume it was
1392                  * already stripped or not added in the
1393                  * first place.
1394                  */
1395                 goto copy_fname_out;
1396         }
1397         /* Return the trailing name after the prefix. */
1398         *fname_dst_out = &fname_dst[prefix_len];
1399         TALLOC_FREE(dfs_prefix);
1400         return NT_STATUS_OK;
1401
1402   copy_fname_out:
1403
1404         /*
1405          * No change to the destination name. Just
1406          * point it at the incoming destination name.
1407          */
1408         *fname_dst_out = fname_dst;
1409         TALLOC_FREE(dfs_prefix);
1410         return NT_STATUS_OK;
1411 }
1412
1413 /********************************************************************
1414  Convert a pathname into a DFS path if it hasn't already been converted.
1415  Always returns a talloc'ed path, makes it easy to pass const paths in.
1416 ********************************************************************/
1417
1418 char *smb1_dfs_share_path(TALLOC_CTX *ctx,
1419                           struct cli_state *cli,
1420                           const char *path)
1421 {
1422         bool is_dfs = smbXcli_conn_dfs_supported(cli->conn) &&
1423                         smbXcli_tcon_is_dfs_share(cli->smb1.tcon);
1424         bool is_already_dfs_path = false;
1425         bool posix = (cli->requested_posix_capabilities &
1426                         CIFS_UNIX_POSIX_PATHNAMES_CAP);
1427         char sepchar = (posix ? '/' : '\\');
1428
1429         if (!is_dfs) {
1430                 return talloc_strdup(ctx, path);
1431         }
1432         is_already_dfs_path = cli_dfs_is_already_full_path(cli, path);
1433         if (is_already_dfs_path) {
1434                 return talloc_strdup(ctx, path);
1435         }
1436         /*
1437          * We don't use cli_dfs_make_full_path() as,
1438          * when given a null path, cli_dfs_make_full_path
1439          * deliberately adds a trailing '\\' (this is by
1440          * design to check for an existing DFS prefix match).
1441          */
1442         if (path[0] == '\0') {
1443                 return talloc_asprintf(ctx,
1444                                        "%c%s%c%s",
1445                                        sepchar,
1446                                        smbXcli_conn_remote_name(cli->conn),
1447                                        sepchar,
1448                                        cli->share);
1449         }
1450         while (*path == sepchar) {
1451                 path++;
1452         }
1453         return talloc_asprintf(ctx,
1454                                "%c%s%c%s%c%s",
1455                                sepchar,
1456                                smbXcli_conn_remote_name(cli->conn),
1457                                sepchar,
1458                                cli->share,
1459                                sepchar,
1460                                path);
1461 }