source/msdfs/msdfs.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    MSDfs services for Samba
   5    Copyright (C) Shirish Kalele 2000
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern int DEBUGLEVEL;
  25 extern pstring global_myname;
  26 extern uint32 global_client_caps;
  27
  28 #ifdef WITH_MSDFS
  29
  30 /**********************************************************************
  31  Create a tcon relative path from a dfs_path structure
  32  **********************************************************************/
  33
  34 static void create_nondfs_path(char* pathname, struct dfs_path* pdp)
  35 {
  36         pstrcpy(pathname,pdp->volumename);
  37         pstrcat(pathname,"\\");
  38         pstrcat(pathname,pdp->restofthepath);
  39 }
  40
  41 /**********************************************************************
  42   Parse the pathname  of the form \hostname\service\volume\restofthepath
  43   into the dfs_path structure
  44  **********************************************************************/
  45
  46 static BOOL parse_dfs_path(char* pathname, struct dfs_path* pdp)
  47 {
  48         pstring pathname_local;
  49         char* p,*temp;
  50
  51         pstrcpy(pathname_local,pathname);
  52         p = temp = pathname_local;
  53
  54         ZERO_STRUCTP(pdp);
  55
  56         trim_string(temp,"\\","\\");
  57         DEBUG(10,("temp in parse_dfs_path: .%s. after trimming \\'s\n",temp));
  58
  59         /* now tokenize */
  60         /* parse out hostname */
  61         p = strchr_m(temp,'\\');
  62         if(p == NULL)
  63                 return False;
  64         *p = '\0';
  65         pstrcpy(pdp->hostname,temp);
  66         DEBUG(10,("hostname: %s\n",pdp->hostname));
  67
  68         /* parse out servicename */
  69         temp = p+1;
  70         p = strchr_m(temp,'\\');
  71         if(p == NULL) {
  72                 pstrcpy(pdp->servicename,temp);
  73                 return True;
  74         }
  75         *p = '\0';
  76         pstrcpy(pdp->servicename,temp);
  77         DEBUG(10,("servicename: %s\n",pdp->servicename));
  78
  79         /* parse out volumename */
  80         temp = p+1;
  81         p = strchr_m(temp,'\\');
  82         if(p == NULL) {
  83                 pstrcpy(pdp->volumename,temp);
  84                 return True;
  85         }
  86         *p = '\0';
  87         pstrcpy(pdp->volumename,temp);
  88         DEBUG(10,("volumename: %s\n",pdp->volumename));
  89
  90         /* remaining path .. */
  91         pstrcpy(pdp->restofthepath,p+1);
  92         DEBUG(10,("rest of the path: %s\n",pdp->restofthepath));
  93         return True;
  94 }
  95
  96 /********************************************************
  97  Fake up a connection struct for the VFS layer.
  98 *********************************************************/
  99
 100 static BOOL create_conn_struct( connection_struct *conn, int snum, char *path)
 101 {
 102         ZERO_STRUCTP(conn);
 103         conn->service = snum;
 104         conn->connectpath = path;
 105
 106         if (!vfs_init(conn)) {
 107                 DEBUG(0,("create_conn_struct: vfs init failed.\n"));
 108                 return False;
 109         }
 110         return True;
 111 }
 112
 113 /**********************************************************************
 114  Forms a valid Unix pathname from the junction
 115  **********************************************************************/
 116
 117 static BOOL form_path_from_junction(struct junction_map* jn, char* path, int max_pathlen,
 118                                                                 connection_struct *conn)
 119 {
 120         int snum;
 121
 122         if(!path || !jn)
 123                 return False;
 124
 125         snum = lp_servicenumber(jn->service_name);
 126         if(snum < 0)
 127                 return False;
 128
 129         safe_strcpy(path, lp_pathname(snum), max_pathlen-1);
 130         safe_strcat(path, "/", max_pathlen-1);
 131         strlower(jn->volume_name);
 132         safe_strcat(path, jn->volume_name, max_pathlen-1);
 133
 134         if (!create_conn_struct(conn, snum, path))
 135                 return False;
 136
 137         return True;
 138 }
 139
 140 /**********************************************************************
 141  Creates a junction structure from the Dfs pathname
 142  **********************************************************************/
 143
 144 BOOL create_junction(char* pathname, struct junction_map* jn)
 145 {
 146         struct dfs_path dp;
 147
 148         parse_dfs_path(pathname,&dp);
 149
 150         /* check if path is dfs : check hostname is the first token */
 151         if(global_myname && (strcasecmp(global_myname,dp.hostname)!=0)) {
 152                 DEBUG(4,("create_junction: Invalid hostname %s in dfs path %s\n", dp.hostname, pathname));
 153                 return False;
 154         }
 155
 156         /* Check for a non-DFS share */
 157         if(!lp_msdfs_root(lp_servicenumber(dp.servicename))) {
 158                 DEBUG(4,("create_junction: %s is not an msdfs root.\n", dp.servicename));
 159                 return False;
 160         }
 161
 162         pstrcpy(jn->service_name,dp.servicename);
 163         pstrcpy(jn->volume_name,dp.volumename);
 164         return True;
 165 }
 166
 167 /**********************************************************************
 168  Parse the contents of a symlink to verify if it is an msdfs referral
 169  A valid referral is of the form: msdfs:server1\share1,server2\share2
 170  **********************************************************************/
 171
 172 static BOOL parse_symlink(char* buf,struct referral** preflist, int* refcount)
 173 {
 174         pstring temp;
 175         char* prot;
 176         char* alt_path[MAX_REFERRAL_COUNT];
 177         int count=0, i;
 178         struct referral* reflist;
 179
 180         pstrcpy(temp,buf);
 181
 182         prot = strtok(temp,":");
 183
 184         if(!strequal(prot, "msdfs"))
 185                 return False;
 186
 187         /* It's an msdfs referral */
 188         if(!preflist)
 189                 return True;
 190
 191         /* parse out the alternate paths */
 192         while(((alt_path[count] = strtok(NULL,",")) != NULL) && count<MAX_REFERRAL_COUNT)
 193                 count++;
 194
 195         DEBUG(10,("parse_symlink: count=%d\n", count));
 196
 197         reflist = *preflist = (struct referral*) malloc(count * sizeof(struct referral));
 198         if(reflist == NULL) {
 199                 DEBUG(0,("parse_symlink: Malloc failed!\n"));
 200                 return False;
 201         }
 202
 203         for(i=0;i<count;i++) {
 204                 /* replace / in the alternate path by a \ */
 205                 char* p = strchr_m(alt_path[i],'/');
 206                 if(p)
 207                         *p = '\\';
 208
 209                 pstrcpy(reflist[i].alternate_path, "\\");
 210                 pstrcat(reflist[i].alternate_path, alt_path[i]);
 211                 reflist[i].proximity = 0;
 212                 reflist[i].ttl = REFERRAL_TTL;
 213                 DEBUG(10, ("parse_symlink: Created alt path: %s\n", reflist[i].alternate_path));
 214         }
 215
 216         if(refcount)
 217                 *refcount = count;
 218
 219         return True;
 220 }
 221
 222 /**********************************************************************
 223  Returns true if the unix path is a valid msdfs symlink
 224  **********************************************************************/
 225
 226 BOOL is_msdfs_link(connection_struct* conn, char* path)
 227 {
 228         SMB_STRUCT_STAT st;
 229         pstring referral;
 230         int referral_len = 0;
 231
 232         if(!path || !conn)
 233                 return False;
 234
 235         strlower(path);
 236
 237         if(conn->vfs_ops.lstat(conn,path,&st) != 0) {
 238                 DEBUG(5,("is_msdfs_link: %s does not exist.\n",path));
 239                 return False;
 240         }
 241
 242         if(S_ISLNK(st.st_mode)) {
 243                 /* open the link and read it */
 244                 referral_len = conn->vfs_ops.readlink(conn, path, referral, sizeof(pstring));
 245                 if(referral_len == -1)
 246                         DEBUG(0,("is_msdfs_link: Error reading msdfs link %s: %s\n", path, strerror(errno)));
 247
 248                 referral[referral_len] = '\0';
 249                 DEBUG(5,("is_msdfs_link: %s -> %s\n",path,referral));
 250                 if(parse_symlink(referral, NULL, NULL))
 251                         return True;
 252         }
 253         return False;
 254 }
 255
 256 /**********************************************************************
 257  Fills in the junction_map struct with the referrals from the
 258  symbolic link
 259  **********************************************************************/
 260
 261 BOOL get_referred_path(struct junction_map* junction)
 262 {
 263         pstring path;
 264         pstring buf;
 265         SMB_STRUCT_STAT st;
 266         connection_struct conns;
 267         connection_struct *conn = &conns;
 268
 269         if(!form_path_from_junction(junction, path, sizeof(path), conn))
 270                 return False;
 271
 272         DEBUG(5,("get_referred_path: lstat target: %s\n", path));
 273
 274         if(conn->vfs_ops.lstat(conn,path,&st) != 0) {
 275                 DEBUG(5,("get_referred_path: %s does not exist.\n",path));
 276                 return False;
 277         }
 278
 279         if(S_ISLNK(st.st_mode)) {
 280                 /* open the link and read it to get the dfs referral */
 281                 int linkcnt = 0;
 282                 linkcnt = conn->vfs_ops.readlink(conn, path, buf, sizeof(buf));
 283                 buf[linkcnt] = '\0';
 284                 DEBUG(5,("get_referred_path: Referral: %s\n",buf));
 285                 if(parse_symlink(buf, &junction->referral_list, &junction->referral_count))
 286                         return True;
 287         }
 288         return False;
 289 }
 290
 291 /**************************************************************
 292 Decides if given pathname is Dfs and if it should be redirected
 293 Converts pathname to non-dfs format if Dfs redirection not required
 294 **************************************************************/
 295
 296 BOOL dfs_redirect(char* pathname, connection_struct* conn)
 297 {
 298         struct dfs_path dp;
 299         pstring temp;
 300         fstring path;
 301
 302         pstrcpy(temp,pathname);
 303
 304         if(!lp_msdfs_root(SNUM(conn)) )
 305                 return False;
 306
 307         parse_dfs_path(pathname,&dp);
 308
 309         if(global_myname && (strcasecmp(global_myname,dp.hostname)!=0))
 310                 return False;
 311
 312         /* check if need to redirect */
 313         fstrcpy(path, conn->connectpath);
 314         fstrcat(path, "/");
 315         fstrcat(path, dp.volumename);
 316         if(is_msdfs_link(conn, path)) {
 317                 DEBUG(4,("dfs_redirect: Redirecting %s\n",temp));
 318                 return True;
 319         } else {
 320                 create_nondfs_path(pathname,&dp);
 321                 DEBUG(4,("dfs_redirect: Not redirecting %s. Converted to non-dfs pathname \'%s\'\n",
 322                                 temp,pathname));
 323                 return False;
 324         }
 325 }
 326
 327 /*
 328   Special DFS redirect call for findfirst's.
 329   If the findfirst is for the dfs junction, then no redirection,
 330   if it is for the underlying directory contents, redirect.
 331   */
 332
 333 BOOL dfs_findfirst_redirect(char* pathname, connection_struct* conn)
 334 {
 335         struct dfs_path dp;
 336
 337         pstring temp;
 338
 339         pstrcpy(temp,pathname);
 340
 341         /* Is the path Dfs-redirectable? */
 342         if(!dfs_redirect(temp,conn)) {
 343                 pstrcpy(pathname,temp);
 344                 return False;
 345         }
 346
 347         parse_dfs_path(pathname,&dp);
 348         DEBUG(8,("dfs_findfirst_redirect: path %s is in Dfs. dp.restofthepath=.%s.\n",
 349                                 pathname,dp.restofthepath));
 350         if(!(*(dp.restofthepath))) {
 351                 create_nondfs_path(pathname,&dp);
 352                 return False;
 353         }
 354
 355         return True;
 356 }
 357
 358 static int setup_ver2_dfs_referral(char* pathname, char** ppdata,
 359                                    struct junction_map* junction,
 360                                    BOOL self_referral)
 361 {
 362         char* pdata = *ppdata;
 363
 364         unsigned char uni_requestedpath[1024];
 365         int uni_reqpathoffset1,uni_reqpathoffset2;
 366         int uni_curroffset;
 367         int requestedpathlen=0;
 368         int offset;
 369         int reply_size = 0;
 370         int i=0;
 371
 372         DEBUG(10,("setting up version2 referral\nRequested path:\n"));
 373
 374         requestedpathlen = (dos_struni2(uni_requestedpath,pathname,512)+1)*2;
 375
 376         dump_data(10,uni_requestedpath,requestedpathlen);
 377
 378         DEBUG(10,("ref count = %u\n",junction->referral_count));
 379
 380         uni_reqpathoffset1 = REFERRAL_HEADER_SIZE +
 381                         VERSION2_REFERRAL_SIZE * junction->referral_count;
 382
 383         uni_reqpathoffset2 = uni_reqpathoffset1 + requestedpathlen;
 384
 385         uni_curroffset = uni_reqpathoffset2 + requestedpathlen;
 386
 387         reply_size = REFERRAL_HEADER_SIZE + VERSION2_REFERRAL_SIZE*junction->referral_count +
 388                                         2 * requestedpathlen;
 389         DEBUG(10,("reply_size: %u\n",reply_size));
 390
 391         /* add up the unicode lengths of all the referral paths */
 392         for(i=0;i<junction->referral_count;i++) {
 393                 DEBUG(10,("referral %u : %s\n",i,junction->referral_list[i].alternate_path));
 394                 reply_size += (strlen(junction->referral_list[i].alternate_path)+1)*2;
 395         }
 396
 397         DEBUG(10,("reply_size = %u\n",reply_size));
 398         /* add the unexplained 0x16 bytes */
 399         reply_size += 0x16;
 400
 401         pdata = *ppdata = Realloc(pdata,reply_size);
 402         if(pdata == NULL) {
 403                 DEBUG(0,("malloc failed for Realloc!\n"));
 404                 return -1;
 405         }
 406
 407         /* copy in the dfs requested paths.. required for offset calculations */
 408         memcpy(pdata+uni_reqpathoffset1,uni_requestedpath,requestedpathlen);
 409         memcpy(pdata+uni_reqpathoffset2,uni_requestedpath,requestedpathlen);
 410
 411         /* create the header */
 412         SSVAL(pdata,0,requestedpathlen-2); /* path consumed */
 413         SSVAL(pdata,2,junction->referral_count); /* number of referral in this pkt */
 414         if(self_referral)
 415                 SIVAL(pdata,4,DFSREF_REFERRAL_SERVER | DFSREF_STORAGE_SERVER);
 416         else
 417                 SIVAL(pdata,4,DFSREF_STORAGE_SERVER);
 418
 419         offset = 8;
 420         /* add the referral elements */
 421         for(i=0;i<junction->referral_count;i++) {
 422                 struct referral* ref = &(junction->referral_list[i]);
 423                 int unilen;
 424
 425                 SSVAL(pdata,offset,2); /* version 2 */
 426                 SSVAL(pdata,offset+2,VERSION2_REFERRAL_SIZE);
 427                 if(self_referral)
 428                         SSVAL(pdata,offset+4,1);
 429                 else
 430                         SSVAL(pdata,offset+4,0);
 431                 SSVAL(pdata,offset+6,0); /* ref_flags :use path_consumed bytes? */
 432                 SIVAL(pdata,offset+8,ref->proximity);
 433                 SIVAL(pdata,offset+12,ref->ttl);
 434
 435                 SSVAL(pdata,offset+16,uni_reqpathoffset1-offset);
 436                 SSVAL(pdata,offset+18,uni_reqpathoffset2-offset);
 437                 /* copy referred path into current offset */
 438                 unilen = (dos_struni2(pdata+uni_curroffset,ref->alternate_path,512) +1)*2;
 439                 SSVAL(pdata,offset+20,uni_curroffset-offset);
 440
 441                 uni_curroffset += unilen;
 442                 offset += VERSION2_REFERRAL_SIZE;
 443         }
 444         /* add in the unexplained 22 (0x16) bytes at the end */
 445         memset(pdata+uni_curroffset,'\0',0x16);
 446         free(junction->referral_list);
 447         return reply_size;
 448 }
 449
 450 static int setup_ver3_dfs_referral(char* pathname, char** ppdata,
 451                                    struct junction_map* junction,
 452                                    BOOL self_referral)
 453 {
 454         char* pdata = *ppdata;
 455
 456         unsigned char uni_reqpath[1024];
 457         int uni_reqpathoffset1, uni_reqpathoffset2;
 458         int uni_curroffset;
 459         int reply_size = 0;
 460
 461         int reqpathlen = 0;
 462         int offset,i=0;
 463
 464         DEBUG(10,("setting up version3 referral\n"));
 465
 466         reqpathlen = (dos_struni2(uni_reqpath,pathname,512)+1)*2;
 467
 468         dump_data(10,uni_reqpath,reqpathlen);
 469
 470         uni_reqpathoffset1 = REFERRAL_HEADER_SIZE + VERSION3_REFERRAL_SIZE * junction->referral_count;
 471         uni_reqpathoffset2 = uni_reqpathoffset1 + reqpathlen;
 472         reply_size = uni_curroffset = uni_reqpathoffset2 + reqpathlen;
 473
 474         for(i=0;i<junction->referral_count;i++) {
 475                 DEBUG(10,("referral %u : %s\n",i,junction->referral_list[i].alternate_path));
 476                 reply_size += (strlen(junction->referral_list[i].alternate_path)+1)*2;
 477         }
 478
 479         pdata = *ppdata = Realloc(pdata,reply_size);
 480         if(pdata == NULL) {
 481                 DEBUG(0,("version3 referral setup: malloc failed for Realloc!\n"));
 482                 return -1;
 483         }
 484
 485         /* create the header */
 486         SSVAL(pdata,0,reqpathlen-2); /* path consumed */
 487         SSVAL(pdata,2,junction->referral_count); /* number of referral in this pkt */
 488         if(self_referral)
 489                 SIVAL(pdata,4,DFSREF_REFERRAL_SERVER | DFSREF_STORAGE_SERVER);
 490         else
 491                 SIVAL(pdata,4,DFSREF_STORAGE_SERVER);
 492
 493         /* copy in the reqpaths */
 494         memcpy(pdata+uni_reqpathoffset1,uni_reqpath,reqpathlen);
 495         memcpy(pdata+uni_reqpathoffset2,uni_reqpath,reqpathlen);
 496
 497         offset = 8;
 498         for(i=0;i<junction->referral_count;i++) {
 499                 struct referral* ref = &(junction->referral_list[i]);
 500                 int unilen;
 501
 502                 SSVAL(pdata,offset,3); /* version 3 */
 503                 SSVAL(pdata,offset+2,VERSION3_REFERRAL_SIZE);
 504                 if(self_referral)
 505                         SSVAL(pdata,offset+4,1);
 506                 else
 507                         SSVAL(pdata,offset+4,0);
 508
 509                 SSVAL(pdata,offset+6,0); /* ref_flags :use path_consumed bytes? */
 510                 SIVAL(pdata,offset+8,ref->ttl);
 511
 512                 SSVAL(pdata,offset+12,uni_reqpathoffset1-offset);
 513                 SSVAL(pdata,offset+14,uni_reqpathoffset2-offset);
 514                 /* copy referred path into current offset */
 515                 unilen = (dos_struni2(pdata+uni_curroffset,ref->alternate_path,512) +1)*2;
 516                 SSVAL(pdata,offset+16,uni_curroffset-offset);
 517                 /* copy 0x10 bytes of 00's in the ServiceSite GUID */
 518                 memset(pdata+offset+18,'\0',16);
 519
 520                 uni_curroffset += unilen;
 521                 offset += VERSION3_REFERRAL_SIZE;
 522         }
 523         free(junction->referral_list);
 524         return reply_size;
 525 }
 526
 527 /******************************************************************
 528  * Set up the Dfs referral for the dfs pathname
 529  ******************************************************************/
 530
 531 int setup_dfs_referral(char* pathname, int max_referral_level, char** ppdata)
 532 {
 533         struct junction_map junction;
 534
 535         BOOL self_referral;
 536
 537         int reply_size = 0;
 538
 539         ZERO_STRUCT(junction);
 540
 541         if(!create_junction(pathname, &junction))
 542                 return -1;
 543
 544         /* get the junction entry */
 545         if(!get_referred_path(&junction)) {
 546
 547                 /* refer the same pathname, create a standard referral struct */
 548                 struct referral* ref;
 549                 self_referral = True;
 550                 junction.referral_count = 1;
 551                 if((ref = (struct referral*) malloc(sizeof(struct referral))) == NULL) {
 552                         DEBUG(0,("malloc failed for referral\n"));
 553                         return -1;
 554                 }
 555
 556                 pstrcpy(ref->alternate_path,pathname);
 557                 ref->proximity = 0;
 558                 ref->ttl = REFERRAL_TTL;
 559                 junction.referral_list = ref;
 560         } else {
 561                 self_referral = False;
 562                 if( DEBUGLVL( 3 ) ) {
 563                         int i=0;
 564                         dbgtext("setup_dfs_referral: Path %s to alternate path(s):",pathname);
 565                         for(i=0;i<junction.referral_count;i++)
 566                                 dbgtext(" %s",junction.referral_list[i].alternate_path);
 567                         dbgtext(".\n");
 568                 }
 569         }
 570
 571         /* create the referral depeding on version */
 572         DEBUG(10,("max_referral_level :%d\n",max_referral_level));
 573         if(max_referral_level<2 || max_referral_level>3)
 574                 max_referral_level = 2;
 575
 576         switch(max_referral_level) {
 577         case 2:
 578                 {
 579                 reply_size = setup_ver2_dfs_referral(pathname, ppdata, &junction, self_referral);
 580                 break;
 581                 }
 582         case 3:
 583                 {
 584                 reply_size = setup_ver3_dfs_referral(pathname, ppdata, &junction, self_referral);
 585                 break;
 586                 }
 587         default:
 588                 {
 589                 DEBUG(0,("setup_dfs_referral: Invalid dfs referral version: %d\n", max_referral_level));
 590                 return -1;
 591                 }
 592         }
 593
 594         DEBUG(10,("DFS Referral pdata:\n"));
 595         dump_data(10,*ppdata,reply_size);
 596         return reply_size;
 597 }
 598
 599 int dfs_path_error(char* inbuf, char* outbuf)
 600 {
 601         enum remote_arch_types ra_type = get_remote_arch();
 602         BOOL NT_arch = ((ra_type==RA_WINNT) || (ra_type == RA_WIN2K));
 603         if(NT_arch && (global_client_caps & (CAP_NT_SMBS | CAP_STATUS32)) ) {
 604                 SSVAL(outbuf,smb_flg2,SVAL(outbuf,smb_flg2) | FLAGS2_32_BIT_ERROR_CODES);
 605                 return(ERROR(0,0xc0000000|NT_STATUS_PATH_NOT_COVERED));
 606         }
 607         return(ERROR(ERRSRV,ERRbadpath));
 608 }
 609
 610 /**********************************************************************
 611  The following functions are called by the NETDFS RPC pipe functions
 612  **********************************************************************/
 613
 614 BOOL create_msdfs_link(struct junction_map* jn, BOOL exists)
 615 {
 616         pstring path;
 617         pstring msdfs_link;
 618         connection_struct conns;
 619         connection_struct *conn = &conns;
 620         int i=0;
 621
 622         if(!form_path_from_junction(jn, path, sizeof(path), conn))
 623                 return False;
 624
 625         /* form the msdfs_link contents */
 626         pstrcpy(msdfs_link, "msdfs:");
 627         for(i=0; i<jn->referral_count; i++) {
 628                 char* refpath = jn->referral_list[i].alternate_path;
 629
 630                 trim_string(refpath, "\\", "\\");
 631                 if(*refpath == '\0')
 632                         continue;
 633
 634                 if(i>0)
 635                         pstrcat(msdfs_link, ",");
 636
 637                 pstrcat(msdfs_link, refpath);
 638         }
 639
 640         DEBUG(5,("create_msdfs_link: Creating new msdfs link: %s -> %s\n", path, msdfs_link));
 641
 642         if(exists)
 643                 if(conn->vfs_ops.unlink(conn,path)!=0)
 644                         return False;
 645
 646         if(conn->vfs_ops.symlink(conn, msdfs_link, path) < 0) {
 647                 DEBUG(1,("create_msdfs_link: symlink failed %s -> %s\nError: %s\n",
 648                                 path, msdfs_link, strerror(errno)));
 649                 return False;
 650         }
 651         return True;
 652 }
 653
 654 BOOL remove_msdfs_link(struct junction_map* jn)
 655 {
 656         pstring path;
 657         connection_struct conns;
 658         connection_struct *conn = &conns;
 659
 660         if(!form_path_from_junction(jn, path, sizeof(path), conn))
 661                 return False;
 662
 663         if(conn->vfs_ops.unlink(conn, path)!=0)
 664                 return False;
 665
 666         return True;
 667 }
 668
 669 static BOOL form_junctions(int snum, struct junction_map* jn, int* jn_count)
 670 {
 671         int cnt = *jn_count;
 672         DIR *dirp;
 673         char* dname;
 674         pstring connect_path;
 675         char* service_name = lp_servicename(snum);
 676         connection_struct conns;
 677         connection_struct *conn = &conns;
 678
 679         pstrcpy(connect_path,lp_pathname(snum));
 680
 681         if(*connect_path == '\0')
 682                 return False;
 683
 684         /*
 685          * Fake up a connection struct for the VFS layer.
 686          */
 687
 688         if (!create_conn_struct(conn, snum, connect_path))
 689                 return False;
 690
 691         /* form a junction for the msdfs root - convention */
 692         /*
 693                 pstrpcy(jn[cnt].service_name, service_name);
 694                 jn[cnt].volume_name[0] = '\0';
 695                 jn[cnt].referral_count = 1;
 696
 697                 slprintf(alt_path,sizeof(alt_path)-1"\\\\%s\\%s", global_myname, service_name);
 698                 jn[cnt].referral_l
 699         */
 700
 701         dirp = conn->vfs_ops.opendir(conn, connect_path);
 702         if(!dirp)
 703                 return False;
 704
 705         while((dname = vfs_readdirname(conn, dirp)) != NULL) {
 706                 SMB_STRUCT_STAT st;
 707                 pstring pathreal;
 708                 fstring buf;
 709                 int buflen = 0;
 710                 pstrcpy(pathreal, connect_path);
 711                 pstrcat(pathreal, "/");
 712                 pstrcat(pathreal, dname);
 713
 714                 if(conn->vfs_ops.lstat(conn,pathreal,&st) != 0) {
 715                         DEBUG(4,("lstat error for %s: %s\n",pathreal, strerror(errno)));
 716                         continue;
 717                 }
 718                 if(S_ISLNK(st.st_mode)) {
 719                         buflen = conn->vfs_ops.readlink(conn, pathreal, buf, sizeof(fstring));
 720                         buf[buflen] = '\0';
 721                         if(parse_symlink(buf, &(jn[cnt].referral_list), &(jn[cnt].referral_count))) {
 722                                 pstrcpy(jn[cnt].service_name, service_name);
 723                                 pstrcpy(jn[cnt].volume_name, dname);
 724                                 cnt++;
 725                         }
 726                 }
 727         }
 728
 729         conn->vfs_ops.closedir(conn,dirp);
 730         *jn_count = cnt;
 731         return True;
 732 }
 733
 734 int enum_msdfs_links(struct junction_map* jn)
 735 {
 736         int i=0;
 737         int jn_count = 0;
 738
 739         if(!lp_host_msdfs())
 740                 return -1;
 741
 742         for(i=0;*lp_servicename(i);i++) {
 743                 if(lp_msdfs_root(i))
 744                         form_junctions(i,jn,&jn_count);
 745         }
 746         return jn_count;
 747 }
 748
 749
 750 #else
 751 /* Stub functions if WITH_MSDFS not defined */
 752  int setup_dfs_referral(char* pathname, int max_referral_level, char** ppdata)
 753 {
 754         return -1;
 755 }
 756
 757  BOOL is_msdfs_link(connection_struct* conn, char* path)
 758 {
 759         return False;
 760 }
 761
 762 #endif