source3/libsmb/clidfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client connect/disconnect routines
   4    Copyright (C) Andrew Tridgell                  1994-1998
   5    Copyright (C) Gerald (Jerry) Carter            2004
   6    Copyright (C) Jeremy Allison                   2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /********************************************************************
  25  Important point.
  26
  27  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  28  are not C escaped here).
  29
  30  - but if we're using POSIX paths then <pathname> may contain
  31    '/' separators, not '\\' separators. So cope with '\\' or '/'
  32    as a separator when looking at the pathname part.... JRA.
  33 ********************************************************************/
  34
  35 struct client_connection {
  36         struct client_connection *prev, *next;
  37         struct cli_state *cli;
  38         char *mount;
  39 };
  40
  41 /* global state....globals reek! */
  42 int max_protocol = PROTOCOL_NT1;
  43
  44 static struct cm_cred_struct {
  45         char *username;
  46         char *password;
  47         bool got_pass;
  48         bool use_kerberos;
  49         int signing_state;
  50 } cm_creds;
  51
  52 static void cm_set_password(const char *newpass);
  53
  54 static int port;
  55 static int name_type = 0x20;
  56 static bool have_ip;
  57 static struct sockaddr_storage dest_ss;
  58
  59 static struct client_connection *connections;
  60
  61 /********************************************************************
  62  Return a connection to a server.
  63 ********************************************************************/
  64
  65 static struct cli_state *do_connect(TALLOC_CTX *ctx,
  66                                         const char *server,
  67                                         const char *share,
  68                                         bool show_sessetup)
  69 {
  70         struct cli_state *c = NULL;
  71         struct nmb_name called, calling;
  72         const char *server_n;
  73         struct sockaddr_storage ss;
  74         char *servicename;
  75         char *sharename;
  76         char *newserver, *newshare;
  77         const char *username;
  78         const char *password;
  79         NTSTATUS status;
  80
  81         /* make a copy so we don't modify the global string 'service' */
  82         servicename = talloc_strdup(ctx,share);
  83         if (!servicename) {
  84                 return NULL;
  85         }
  86         sharename = servicename;
  87         if (*sharename == '\\') {
  88                 server = sharename+2;
  89                 sharename = strchr_m(server,'\\');
  90                 if (!sharename) {
  91                         return NULL;
  92                 }
  93                 *sharename = 0;
  94                 sharename++;
  95         }
  96
  97         server_n = server;
  98
  99         zero_addr(&ss);
 100
 101         make_nmb_name(&calling, global_myname(), 0x0);
 102         make_nmb_name(&called , server, name_type);
 103
 104  again:
 105         zero_addr(&ss);
 106         if (have_ip)
 107                 ss = dest_ss;
 108
 109         /* have to open a new connection */
 110         if (!(c=cli_initialise()) || (cli_set_port(c, port) != port)) {
 111                 d_printf("Connection to %s failed\n", server_n);
 112                 return NULL;
 113         }
 114         status = cli_connect(c, server_n, &ss);
 115         if (!NT_STATUS_IS_OK(status)) {
 116                 d_printf("Connection to %s failed (Error %s)\n",
 117                                 server_n,
 118                                 nt_errstr(status));
 119                 return NULL;
 120         }
 121
 122         c->protocol = max_protocol;
 123         c->use_kerberos = cm_creds.use_kerberos;
 124         cli_setup_signing_state(c, cm_creds.signing_state);
 125
 126         if (!cli_session_request(c, &calling, &called)) {
 127                 char *p;
 128                 d_printf("session request to %s failed (%s)\n",
 129                          called.name, cli_errstr(c));
 130                 cli_shutdown(c);
 131                 c = NULL;
 132                 if ((p=strchr_m(called.name, '.'))) {
 133                         *p = 0;
 134                         goto again;
 135                 }
 136                 if (strcmp(called.name, "*SMBSERVER")) {
 137                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 138                         goto again;
 139                 }
 140                 return NULL;
 141         }
 142
 143         DEBUG(4,(" session request ok\n"));
 144
 145         if (!cli_negprot(c)) {
 146                 d_printf("protocol negotiation failed\n");
 147                 cli_shutdown(c);
 148                 return NULL;
 149         }
 150
 151         if (!cm_creds.got_pass) {
 152                 char *pass = getpass("Password: ");
 153                 if (pass) {
 154                         cm_set_password(pass);
 155                 }
 156         }
 157
 158         username = cm_creds.username ? cm_creds.username : "";
 159         password = cm_creds.password ? cm_creds.password : "";
 160
 161         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 162                                                password, strlen(password),
 163                                                password, strlen(password),
 164                                                lp_workgroup()))) {
 165                 /* If a password was not supplied then
 166                  * try again with a null username. */
 167                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 168                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 169                                                 "", 0,
 170                                                 "", 0,
 171                                                lp_workgroup()))) {
 172                         d_printf("session setup failed: %s\n", cli_errstr(c));
 173                         if (NT_STATUS_V(cli_nt_error(c)) ==
 174                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 175                                 d_printf("did you forget to run kinit?\n");
 176                         cli_shutdown(c);
 177                         return NULL;
 178                 }
 179                 d_printf("Anonymous login successful\n");
 180         }
 181
 182         if ( show_sessetup ) {
 183                 if (*c->server_domain) {
 184                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 185                                 c->server_domain,c->server_os,c->server_type));
 186                 } else if (*c->server_os || *c->server_type) {
 187                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 188                                  c->server_os,c->server_type));
 189                 }
 190         }
 191         DEBUG(4,(" session setup ok\n"));
 192
 193         /* here's the fun part....to support 'msdfs proxy' shares
 194            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 195            here before trying to connect to the original share.
 196            check_dfs_proxy() will fail if it is a normal share. */
 197
 198         if ((c->capabilities & CAP_DFS) &&
 199                         cli_check_msdfs_proxy(ctx, c, sharename,
 200                                 &newserver, &newshare)) {
 201                 cli_shutdown(c);
 202                 return do_connect(ctx, newserver, newshare, false);
 203         }
 204
 205         /* must be a normal share */
 206
 207         if (!cli_send_tconX(c, sharename, "?????",
 208                                 password, strlen(password)+1)) {
 209                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 210                 cli_shutdown(c);
 211                 return NULL;
 212         }
 213
 214         DEBUG(4,(" tconx ok\n"));
 215         return c;
 216 }
 217
 218 /****************************************************************************
 219 ****************************************************************************/
 220
 221 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
 222 {
 223         struct client_connection *p;
 224         int i;
 225
 226         for (p=connections,i=0; p; p=p->next,i++) {
 227                 if (strequal(p->cli->desthost, c->desthost) &&
 228                                 strequal(p->cli->share, c->share)) {
 229                         break;
 230                 }
 231         }
 232
 233         if (p) {
 234                 char *name = clean_name(NULL, p->mount);
 235                 if (!name) {
 236                         return;
 237                 }
 238                 p->mount = talloc_strdup(p, name);
 239                 TALLOC_FREE(name);
 240         }
 241 }
 242
 243 /****************************************************************************
 244 ****************************************************************************/
 245
 246 const char *cli_cm_get_mntpoint(struct cli_state *c)
 247 {
 248         struct client_connection *p;
 249         int i;
 250
 251         for (p=connections,i=0; p; p=p->next,i++) {
 252                 if (strequal(p->cli->desthost, c->desthost) &&
 253                                 strequal(p->cli->share, c->share)) {
 254                         break;
 255                 }
 256         }
 257
 258         if (p) {
 259                 return p->mount;
 260         }
 261         return NULL;
 262 }
 263
 264 /********************************************************************
 265  Add a new connection to the list
 266 ********************************************************************/
 267
 268 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 269                                         const char *server,
 270                                         const char *share,
 271                                         bool show_hdr)
 272 {
 273         struct client_connection *node;
 274
 275         /* NB This must be the null context here... JRA. */
 276         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 277         if (!node) {
 278                 return NULL;
 279         }
 280
 281         node->cli = do_connect(ctx, server, share, show_hdr);
 282
 283         if ( !node->cli ) {
 284                 TALLOC_FREE( node );
 285                 return NULL;
 286         }
 287
 288         DLIST_ADD( connections, node );
 289
 290         cli_cm_set_mntpoint(node->cli, "");
 291
 292         return node->cli;
 293
 294 }
 295
 296 /********************************************************************
 297  Return a connection to a server.
 298 ********************************************************************/
 299
 300 static struct cli_state *cli_cm_find(const char *server, const char *share)
 301 {
 302         struct client_connection *p;
 303
 304         for (p=connections; p; p=p->next) {
 305                 if ( strequal(server, p->cli->desthost) &&
 306                                 strequal(share,p->cli->share)) {
 307                         return p->cli;
 308                 }
 309         }
 310
 311         return NULL;
 312 }
 313
 314 /****************************************************************************
 315  Open a client connection to a \\server\share.  Set's the current *cli
 316  global variable as a side-effect (but only if the connection is successful).
 317 ****************************************************************************/
 318
 319 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 320                                 const char *server,
 321                                 const char *share,
 322                                 bool show_hdr)
 323 {
 324         struct cli_state *c;
 325
 326         /* try to reuse an existing connection */
 327
 328         c = cli_cm_find(server, share);
 329         if (!c) {
 330                 c = cli_cm_connect(ctx, server, share, show_hdr);
 331         }
 332
 333         return c;
 334 }
 335
 336 /****************************************************************************
 337 ****************************************************************************/
 338
 339 void cli_cm_shutdown(void)
 340 {
 341         struct client_connection *p, *x;
 342
 343         for (p=connections; p;) {
 344                 cli_shutdown(p->cli);
 345                 x = p;
 346                 p = p->next;
 347
 348                 TALLOC_FREE(x);
 349         }
 350
 351         connections = NULL;
 352         return;
 353 }
 354
 355 /****************************************************************************
 356 ****************************************************************************/
 357
 358 void cli_cm_display(void)
 359 {
 360         struct client_connection *p;
 361         int i;
 362
 363         for ( p=connections,i=0; p; p=p->next,i++ ) {
 364                 d_printf("%d:\tserver=%s, share=%s\n",
 365                         i, p->cli->desthost, p->cli->share );
 366         }
 367 }
 368
 369 /****************************************************************************
 370 ****************************************************************************/
 371
 372 static void cm_set_password(const char *newpass)
 373 {
 374         SAFE_FREE(cm_creds.password);
 375         cm_creds.password = SMB_STRDUP(newpass);
 376         if (cm_creds.password) {
 377                 cm_creds.got_pass = true;
 378         }
 379 }
 380
 381 void cli_cm_set_credentials(struct user_auth_info *user)
 382 {
 383         SAFE_FREE(cm_creds.username);
 384         cm_creds.username = SMB_STRDUP(user->username);
 385
 386         if (user->got_pass) {
 387                 cm_set_password(user->password);
 388         }
 389
 390         cm_creds.use_kerberos = user->use_kerberos;
 391         cm_creds.signing_state = user->signing_state;
 392 }
 393
 394 /****************************************************************************
 395 ****************************************************************************/
 396
 397 void cli_cm_set_port(int port_number)
 398 {
 399         port = port_number;
 400 }
 401
 402 /****************************************************************************
 403 ****************************************************************************/
 404
 405 void cli_cm_set_dest_name_type(int type)
 406 {
 407         name_type = type;
 408 }
 409
 410 /****************************************************************************
 411 ****************************************************************************/
 412
 413 void cli_cm_set_dest_ss(struct sockaddr_storage *pss)
 414 {
 415         dest_ss = *pss;
 416         have_ip = true;
 417 }
 418
 419 /**********************************************************************
 420  split a dfs path into the server, share name, and extrapath components
 421 **********************************************************************/
 422
 423 static void split_dfs_path(TALLOC_CTX *ctx,
 424                                 const char *nodepath,
 425                                 char **pp_server,
 426                                 char **pp_share,
 427                                 char **pp_extrapath)
 428 {
 429         char *p, *q;
 430         char *path;
 431
 432         *pp_server = NULL;
 433         *pp_share = NULL;
 434         *pp_extrapath = NULL;
 435
 436         path = talloc_strdup(ctx, nodepath);
 437         if (!path) {
 438                 return;
 439         }
 440
 441         if ( path[0] != '\\' ) {
 442                 return;
 443         }
 444
 445         p = strchr_m( path + 1, '\\' );
 446         if ( !p ) {
 447                 return;
 448         }
 449
 450         *p = '\0';
 451         p++;
 452
 453         /* Look for any extra/deep path */
 454         q = strchr_m(p, '\\');
 455         if (q != NULL) {
 456                 *q = '\0';
 457                 q++;
 458                 *pp_extrapath = talloc_strdup(ctx, q);
 459         } else {
 460                 *pp_extrapath = talloc_strdup(ctx, "");
 461         }
 462
 463         *pp_share = talloc_strdup(ctx, p);
 464         *pp_server = talloc_strdup(ctx, &path[1]);
 465 }
 466
 467 /****************************************************************************
 468  Return the original path truncated at the directory component before
 469  the first wildcard character. Trust the caller to provide a NULL
 470  terminated string
 471 ****************************************************************************/
 472
 473 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 474 {
 475         size_t len;
 476         char *p1, *p2, *p;
 477         char *path_out;
 478
 479         /* No absolute paths. */
 480         while (IS_DIRECTORY_SEP(*path)) {
 481                 path++;
 482         }
 483
 484         path_out = talloc_strdup(ctx, path);
 485         if (!path_out) {
 486                 return NULL;
 487         }
 488
 489         p1 = strchr_m(path_out, '*');
 490         p2 = strchr_m(path_out, '?');
 491
 492         if (p1 || p2) {
 493                 if (p1 && p2) {
 494                         p = MIN(p1,p2);
 495                 } else if (!p1) {
 496                         p = p2;
 497                 } else {
 498                         p = p1;
 499                 }
 500                 *p = '\0';
 501
 502                 /* Now go back to the start of this component. */
 503                 p1 = strrchr_m(path_out, '/');
 504                 p2 = strrchr_m(path_out, '\\');
 505                 p = MAX(p1,p2);
 506                 if (p) {
 507                         *p = '\0';
 508                 }
 509         }
 510
 511         /* Strip any trailing separator */
 512
 513         len = strlen(path_out);
 514         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 515                 path_out[len-1] = '\0';
 516         }
 517
 518         return path_out;
 519 }
 520
 521 /****************************************************************************
 522 ****************************************************************************/
 523
 524 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 525                                         struct cli_state *cli,
 526                                         const char *dir)
 527 {
 528         /* Ensure the extrapath doesn't start with a separator. */
 529         while (IS_DIRECTORY_SEP(*dir)) {
 530                 dir++;
 531         }
 532
 533         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 534                         cli->desthost, cli->share, dir);
 535 }
 536
 537 /********************************************************************
 538  check for dfs referral
 539 ********************************************************************/
 540
 541 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 542 {
 543         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 544
 545         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 546
 547         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 548                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 549                 return false;
 550
 551         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 552                 return true;
 553
 554         return false;
 555 }
 556
 557 /********************************************************************
 558  Get the dfs referral link.
 559 ********************************************************************/
 560
 561 bool cli_dfs_get_referral(struct cli_state *cli,
 562                         const char *path,
 563                         CLIENT_DFS_REFERRAL**refs,
 564                         size_t *num_refs,
 565                         uint16 *consumed)
 566 {
 567         unsigned int data_len = 0;
 568         unsigned int param_len = 0;
 569         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 570         char param[1024+2];
 571         char *rparam=NULL, *rdata=NULL;
 572         char *p;
 573         size_t pathlen = 2*(strlen(path)+1);
 574         uint16 num_referrals;
 575         CLIENT_DFS_REFERRAL *referrals = NULL;
 576
 577         memset(param, 0, sizeof(param));
 578         SSVAL(param, 0, 0x03);  /* max referral level */
 579         p = &param[2];
 580
 581         p += clistr_push(cli, p, path, MIN(pathlen, sizeof(param)-2),
 582                         STR_TERMINATE);
 583         param_len = PTR_DIFF(p, param);
 584
 585         if (!cli_send_trans(cli, SMBtrans2,
 586                 NULL,                        /* name */
 587                 -1, 0,                          /* fid, flags */
 588                 &setup, 1, 0,                   /* setup, length, max */
 589                 param, param_len, 2,            /* param, length, max */
 590                 NULL, 0, cli->max_xmit /* data, length, max */
 591                 )) {
 592                         return false;
 593         }
 594
 595         if (!cli_receive_trans(cli, SMBtrans2,
 596                 &rparam, &param_len,
 597                 &rdata, &data_len)) {
 598                         return false;
 599         }
 600
 601         *consumed     = SVAL( rdata, 0 );
 602         num_referrals = SVAL( rdata, 2 );
 603
 604         if ( num_referrals != 0 ) {
 605                 uint16 ref_version;
 606                 uint16 ref_size;
 607                 int i;
 608                 uint16 node_offset;
 609
 610                 referrals = SMB_XMALLOC_ARRAY( CLIENT_DFS_REFERRAL,
 611                                 num_referrals);
 612
 613                 /* start at the referrals array */
 614
 615                 p = rdata+8;
 616                 for ( i=0; i<num_referrals; i++ ) {
 617                         ref_version = SVAL( p, 0 );
 618                         ref_size    = SVAL( p, 2 );
 619                         node_offset = SVAL( p, 16 );
 620
 621                         if ( ref_version != 3 ) {
 622                                 p += ref_size;
 623                                 continue;
 624                         }
 625
 626                         referrals[i].proximity = SVAL( p, 8 );
 627                         referrals[i].ttl       = SVAL( p, 10 );
 628
 629                         clistr_pull( cli, referrals[i].dfspath, p+node_offset,
 630                                 sizeof(referrals[i].dfspath), -1,
 631                                 STR_TERMINATE|STR_UNICODE );
 632
 633                         p += ref_size;
 634                 }
 635         }
 636
 637         *num_refs = num_referrals;
 638         *refs = referrals;
 639
 640         SAFE_FREE(rdata);
 641         SAFE_FREE(rparam);
 642
 643         return true;
 644 }
 645
 646
 647 /********************************************************************
 648 ********************************************************************/
 649
 650 bool cli_resolve_path(TALLOC_CTX *ctx,
 651                         const char *mountpt,
 652                         struct cli_state *rootcli,
 653                         const char *path,
 654                         struct cli_state **targetcli,
 655                         char **pp_targetpath)
 656 {
 657         CLIENT_DFS_REFERRAL *refs = NULL;
 658         size_t num_refs;
 659         uint16 consumed;
 660         struct cli_state *cli_ipc = NULL;
 661         char *dfs_path = NULL;
 662         char *cleanpath = NULL;
 663         char *extrapath = NULL;
 664         int pathlen;
 665         char *server = NULL;
 666         char *share = NULL;
 667         struct cli_state *newcli = NULL;
 668         char *newpath = NULL;
 669         char *newmount = NULL;
 670         char *ppath = NULL;
 671         SMB_STRUCT_STAT sbuf;
 672         uint32 attributes;
 673
 674         if ( !rootcli || !path || !targetcli ) {
 675                 return false;
 676         }
 677
 678         /* Don't do anything if this is not a DFS root. */
 679
 680         if ( !rootcli->dfsroot) {
 681                 *targetcli = rootcli;
 682                 *pp_targetpath = talloc_strdup(ctx, path);
 683                 if (!*pp_targetpath) {
 684                         return false;
 685                 }
 686                 return true;
 687         }
 688
 689         *targetcli = NULL;
 690
 691         /* Send a trans2_query_path_info to check for a referral. */
 692
 693         cleanpath = clean_path(ctx, path);
 694         if (!cleanpath) {
 695                 return false;
 696         }
 697
 698         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 699         if (!dfs_path) {
 700                 return false;
 701         }
 702
 703         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 704                 /* This is an ordinary path, just return it. */
 705                 *targetcli = rootcli;
 706                 *pp_targetpath = talloc_strdup(ctx, path);
 707                 if (!*pp_targetpath) {
 708                         return false;
 709                 }
 710                 goto done;
 711         }
 712
 713         /* Special case where client asked for a path that does not exist */
 714
 715         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 716                 *targetcli = rootcli;
 717                 *pp_targetpath = talloc_strdup(ctx, path);
 718                 if (!*pp_targetpath) {
 719                         return false;
 720                 }
 721                 goto done;
 722         }
 723
 724         /* We got an error, check for DFS referral. */
 725
 726         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 727                 return false;
 728         }
 729
 730         /* Check for the referral. */
 731
 732         if (!(cli_ipc = cli_cm_open(ctx, rootcli->desthost, "IPC$", false))) {
 733                 return false;
 734         }
 735
 736         if (!cli_dfs_get_referral(cli_ipc, dfs_path, &refs,
 737                         &num_refs, &consumed) || !num_refs) {
 738                 return false;
 739         }
 740
 741         /* Just store the first referral for now. */
 742
 743         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 744         SAFE_FREE(refs);
 745
 746         if (!server || !share) {
 747                 return false;
 748         }
 749
 750         /* Make sure to recreate the original string including any wildcards. */
 751
 752         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 753         if (!dfs_path) {
 754                 return false;
 755         }
 756         pathlen = strlen(dfs_path)*2;
 757         consumed = MIN(pathlen, consumed);
 758         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 759         if (!*pp_targetpath) {
 760                 return false;
 761         }
 762         dfs_path[consumed/2] = '\0';
 763
 764         /*
 765          * *pp_targetpath is now the unconsumed part of the path.
 766          * dfs_path is now the consumed part of the path
 767          * (in \server\share\path format).
 768          */
 769
 770         /* Open the connection to the target server & share */
 771         if ((*targetcli = cli_cm_open(ctx, server, share, false)) == NULL) {
 772                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 773                         server, share );
 774                 return false;
 775         }
 776
 777         if (extrapath && strlen(extrapath) > 0) {
 778                 *pp_targetpath = talloc_asprintf(ctx,
 779                                                 "%s%s",
 780                                                 extrapath,
 781                                                 *pp_targetpath);
 782                 if (!*pp_targetpath) {
 783                         return false;
 784                 }
 785         }
 786
 787         /* parse out the consumed mount path */
 788         /* trim off the \server\share\ */
 789
 790         ppath = dfs_path;
 791
 792         if (*ppath != '\\') {
 793                 d_printf("cli_resolve_path: "
 794                         "dfs_path (%s) not in correct format.\n",
 795                         dfs_path );
 796                 return false;
 797         }
 798
 799         ppath++; /* Now pointing at start of server name. */
 800
 801         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 802                 return false;
 803         }
 804
 805         ppath++; /* Now pointing at start of share name. */
 806
 807         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 808                 return false;
 809         }
 810
 811         ppath++; /* Now pointing at path component. */
 812
 813         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 814         if (!newmount) {
 815                 return false;
 816         }
 817
 818         cli_cm_set_mntpoint(*targetcli, newmount);
 819
 820         /* Check for another dfs referral, note that we are not
 821            checking for loops here. */
 822
 823         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 824                 if (cli_resolve_path(ctx,
 825                                         newmount,
 826                                         *targetcli,
 827                                         *pp_targetpath,
 828                                         &newcli,
 829                                         &newpath)) {
 830                         /*
 831                          * When cli_resolve_path returns true here it's always
 832                          * returning the complete path in newpath, so we're done
 833                          * here.
 834                          */
 835                         *targetcli = newcli;
 836                         *pp_targetpath = newpath;
 837                         return true;
 838                 }
 839         }
 840
 841   done:
 842
 843         /* If returning true ensure we return a dfs root full path. */
 844         if ((*targetcli)->dfsroot) {
 845                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 846                 if (!dfs_path) {
 847                         return false;
 848                 }
 849                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 850         }
 851
 852         return true;
 853 }
 854
 855 /********************************************************************
 856  Temporary hack - remove when pstring is dead. JRA.
 857 ********************************************************************/
 858
 859 bool cli_resolve_path_pstring( const char *mountpt,
 860                         struct cli_state *rootcli,
 861                         const char *path,
 862                         struct cli_state **targetcli,
 863                         pstring targetpath)
 864 {
 865         char *tpath = NULL;
 866         TALLOC_CTX *ctx = talloc_stackframe();
 867         bool ret = cli_resolve_path(ctx,
 868                                 mountpt,
 869                                 rootcli,
 870                                 path,
 871                                 targetcli,
 872                                 &tpath);
 873         if (tpath) {
 874                 pstrcpy(targetpath, tpath);
 875         }
 876         return ret;
 877 }
 878
 879 /********************************************************************
 880 ********************************************************************/
 881
 882 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 883                                 struct cli_state *cli,
 884                                 const char *sharename,
 885                                 char **pp_newserver,
 886                                 char **pp_newshare )
 887 {
 888         CLIENT_DFS_REFERRAL *refs = NULL;
 889         size_t num_refs;
 890         uint16 consumed;
 891         char *fullpath = NULL;
 892         bool res;
 893         uint16 cnum;
 894         char *newextrapath = NULL;
 895
 896         if (!cli || !sharename) {
 897                 return false;
 898         }
 899
 900         cnum = cli->cnum;
 901
 902         /* special case.  never check for a referral on the IPC$ share */
 903
 904         if (strequal(sharename, "IPC$")) {
 905                 return false;
 906         }
 907
 908         /* send a trans2_query_path_info to check for a referral */
 909
 910         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
 911         if (!fullpath) {
 912                 return false;
 913         }
 914
 915         /* check for the referral */
 916
 917         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
 918                 return false;
 919         }
 920
 921         res = cli_dfs_get_referral(cli, fullpath, &refs, &num_refs, &consumed);
 922
 923         if (!cli_tdis(cli)) {
 924                 SAFE_FREE(refs);
 925                 return false;
 926         }
 927
 928         cli->cnum = cnum;
 929
 930         if (!res || !num_refs) {
 931                 SAFE_FREE(refs);
 932                 return false;
 933         }
 934
 935         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
 936                         pp_newshare, &newextrapath );
 937
 938         SAFE_FREE(refs);
 939
 940         if (!pp_newserver || !pp_newshare) {
 941                 return false;
 942         }
 943
 944         /* check that this is not a self-referral */
 945
 946         if (strequal(cli->desthost, *pp_newserver) &&
 947                         strequal(sharename, *pp_newshare)) {
 948                 return false;
 949         }
 950
 951         return true;
 952 }