summaryrefslogtreecommitdiff
path: root/source3/smbd/msdfs.c
blob: fffe44ab6034fede54c251eb315f40978372db39 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
/* 
   Unix SMB/Netbios implementation.
   Version 3.0
   MSDfs services for Samba
   Copyright (C) Shirish Kalele 2000

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#define DBGC_CLASS DBGC_MSDFS
#include "includes.h"

extern uint32 global_client_caps;

/**********************************************************************
  Parse the pathname  of the form \hostname\service\reqpath
  into the dfs_path structure 
 **********************************************************************/

static BOOL parse_dfs_path(char* pathname, struct dfs_path* pdp)
{
	pstring pathname_local;
	char* p,*temp;

	pstrcpy(pathname_local,pathname);
	p = temp = pathname_local;

	ZERO_STRUCTP(pdp);

	trim_char(temp,'\\','\\');
	DEBUG(10,("temp in parse_dfs_path: .%s. after trimming \\'s\n",temp));

	/* now tokenize */
	/* parse out hostname */
	p = strchr_m(temp,'\\');
	if(p == NULL)
		return False;
	*p = '\0';
	pstrcpy(pdp->hostname,temp);
	DEBUG(10,("parse_dfs_path: hostname: %s\n",pdp->hostname));

	/* parse out servicename */
	temp = p+1;
	p = strchr_m(temp,'\\');
	if(p == NULL) {
		pstrcpy(pdp->servicename,temp);
		pdp->reqpath[0] = '\0';
		return True;
	}
	*p = '\0';
	pstrcpy(pdp->servicename,temp);
	DEBUG(10,("parse_dfs_path: servicename: %s\n",pdp->servicename));

	/* rest is reqpath */
	check_path_syntax(pdp->reqpath, p+1);

	DEBUG(10,("parse_dfs_path: rest of the path: %s\n",pdp->reqpath));
	return True;
}

/**********************************************************************
  Parse the pathname  of the form /hostname/service/reqpath
  into the dfs_path structure 
 **********************************************************************/

static BOOL parse_processed_dfs_path(char* pathname, struct dfs_path* pdp, BOOL allow_wcards)
{
	pstring pathname_local;
	char* p,*temp;

	pstrcpy(pathname_local,pathname);
	p = temp = pathname_local;

	ZERO_STRUCTP(pdp);

	trim_char(temp,'/','/');
	DEBUG(10,("temp in parse_processed_dfs_path: .%s. after trimming \\'s\n",temp));

	/* now tokenize */
	/* parse out hostname */
	p = strchr_m(temp,'/');
	if(p == NULL)
		return False;
	*p = '\0';
	pstrcpy(pdp->hostname,temp);
	DEBUG(10,("parse_processed_dfs_path: hostname: %s\n",pdp->hostname));

	/* parse out servicename */
	temp = p+1;
	p = strchr_m(temp,'/');
	if(p == NULL) {
		pstrcpy(pdp->servicename,temp);
		pdp->reqpath[0] = '\0';
		return True;
	}
	*p = '\0';
	pstrcpy(pdp->servicename,temp);
	DEBUG(10,("parse_processed_dfs_path: servicename: %s\n",pdp->servicename));

	/* rest is reqpath */
	if (allow_wcards) {
		check_path_syntax_wcard(pdp->reqpath, p+1);
	} else {
		check_path_syntax(pdp->reqpath, p+1);
	}

	DEBUG(10,("parse_processed_dfs_path: rest of the path: %s\n",pdp->reqpath));
	return True;
}

/********************************************************
 Fake up a connection struct for the VFS layer.
 Note this CHANGES CWD !!!! JRA.
*********************************************************/

static BOOL create_conn_struct( connection_struct *conn, int snum, char *path)
{
	ZERO_STRUCTP(conn);
	conn->service = snum;
	conn->connectpath = path;
	pstring_sub(conn->connectpath , "%S", lp_servicename(snum));

	/* needed for smbd_vfs_init() */
	
        if ( (conn->mem_ctx=talloc_init("connection_struct")) == NULL ) {
                DEBUG(0,("talloc_init(connection_struct) failed!\n"));
                return False;
        }
	
	if (!smbd_vfs_init(conn)) {
		DEBUG(0,("create_conn_struct: smbd_vfs_init failed.\n"));
		talloc_destroy( conn->mem_ctx );
		return False;
	}

	/*
	 * Windows seems to insist on doing trans2getdfsreferral() calls on the IPC$
	 * share as the anonymous user. If we try to chdir as that user we will
	 * fail.... WTF ? JRA.
	 */

	if (vfs_ChDir(conn,conn->connectpath) != 0) {
		DEBUG(3,("create_conn_struct: Can't ChDir to new conn path %s. Error was %s\n",
					conn->connectpath, strerror(errno) ));
		talloc_destroy( conn->mem_ctx );
		return False;
	}
	return True;
}


/**********************************************************************
 Parse the contents of a symlink to verify if it is an msdfs referral
 A valid referral is of the form: msdfs:server1\share1,server2\share2
 **********************************************************************/

static BOOL parse_symlink(char* buf,struct referral** preflist, 
				 int* refcount)
{
	pstring temp;
	char* prot;
	char* alt_path[MAX_REFERRAL_COUNT];
	int count=0, i;
	struct referral* reflist;

	pstrcpy(temp,buf);
  
	prot = strtok(temp,":");

	if (!strequal(prot, "msdfs"))
		return False;

	/* No referral list requested. Just yes/no. */
	if (!preflist) 
		return True;

	/* parse out the alternate paths */
	while(((alt_path[count] = strtok(NULL,",")) != NULL) && count<MAX_REFERRAL_COUNT)
		count++;

	DEBUG(10,("parse_symlink: count=%d\n", count));

	reflist = *preflist = SMB_MALLOC_ARRAY(struct referral, count);
	if(reflist == NULL) {
		DEBUG(0,("parse_symlink: Malloc failed!\n"));
		return False;
	}
	
	for(i=0;i<count;i++) {
		char *p;

		/* replace all /'s in the alternate path by a \ */
		for(p = alt_path[i]; *p && ((p = strchr_m(p,'/'))!=NULL); p++) {
			*p = '\\'; 
		}

		/* Remove leading '\\'s */
		p = alt_path[i];
		while (*p && (*p == '\\')) {
			p++;
		}

		pstrcpy(reflist[i].alternate_path, "\\");
		pstrcat(reflist[i].alternate_path, p);
		reflist[i].proximity = 0;
		reflist[i].ttl = REFERRAL_TTL;
		DEBUG(10, ("parse_symlink: Created alt path: %s\n", reflist[i].alternate_path));
	}

	if(refcount)
		*refcount = count;

	return True;
}
 
/**********************************************************************
 Returns true if the unix path is a valid msdfs symlink
 **********************************************************************/

BOOL is_msdfs_link(connection_struct* conn, char * path,
		   struct referral** reflistp, int* refcnt,
		   SMB_STRUCT_STAT *sbufp)
{
	SMB_STRUCT_STAT st;
	pstring referral;
	int referral_len = 0;

	if (!path || !conn)
		return False;

	if (sbufp == NULL)
		sbufp = &st;

	if (SMB_VFS_LSTAT(conn, path, sbufp) != 0) {
		DEBUG(5,("is_msdfs_link: %s does not exist.\n",path));
		return False;
	}
  
	if (S_ISLNK(sbufp->st_mode)) {
		/* open the link and read it */
		referral_len = SMB_VFS_READLINK(conn, path, referral, 
						      sizeof(pstring));
		if (referral_len == -1) {
			DEBUG(0,("is_msdfs_link: Error reading msdfs link %s: %s\n", path, strerror(errno)));
			return False;
		}

		referral[referral_len] = '\0';
		DEBUG(5,("is_msdfs_link: %s -> %s\n",path,referral));
		if (parse_symlink(referral, reflistp, refcnt))
			return True;
	}
	return False;
}

/*****************************************************************
 Used by other functions to decide if a dfs path is remote,
and to get the list of referred locations for that remote path.
 
findfirst_flag: For findfirsts, dfs links themselves are not
redirected, but paths beyond the links are. For normal smb calls,
even dfs links need to be redirected.

self_referralp: clients expect a dfs referral for the same share when
they request referrals for dfs roots on a server. 

consumedcntp: how much of the dfs path is being redirected. the client
should try the remaining path on the redirected server.
		
*****************************************************************/

static BOOL resolve_dfs_path(pstring dfspath, struct dfs_path* dp, 
		      connection_struct* conn, BOOL search_flag, 
		      struct referral** reflistpp, int* refcntp,
		      BOOL* self_referralp, int* consumedcntp)
{
	pstring localpath;
	int consumed_level = 1;
	char *p;
	BOOL bad_path = False;
	SMB_STRUCT_STAT sbuf;
	pstring reqpath;

	if (!dp || !conn) {
		DEBUG(1,("resolve_dfs_path: NULL dfs_path* or NULL connection_struct*!\n"));
		return False;
	}

	if (dp->reqpath[0] == '\0') {
		if (self_referralp) {
			DEBUG(6,("resolve_dfs_path: self-referral. returning False\n"));
			*self_referralp = True;
		}
		return False;
	}

	DEBUG(10,("resolve_dfs_path: Conn path = %s req_path = %s\n", conn->connectpath, dp->reqpath));

	unix_convert(dp->reqpath,conn,0,&bad_path,&sbuf);
	/* JRA... should we strlower the last component here.... ? */
	pstrcpy(localpath, dp->reqpath);

	/* check if need to redirect */
	if (is_msdfs_link(conn, localpath, reflistpp, refcntp, NULL)) {
		if ( search_flag ) {
			DEBUG(6,("resolve_dfs_path (FindFirst) No redirection "
				 "for dfs link %s.\n", dfspath));
			return False;
		}
		
		DEBUG(6,("resolve_dfs_path: %s resolves to a valid Dfs link.\n", dfspath));
		if (consumedcntp) 
			*consumedcntp = strlen(dfspath);
		return True;
	}

	/* redirect if any component in the path is a link */
	pstrcpy(reqpath, dp->reqpath);
	p = strrchr_m(reqpath, '/');
	while (p) {
		*p = '\0';
		pstrcpy(localpath, reqpath);
		if (is_msdfs_link(conn, localpath, reflistpp, refcntp, NULL)) {
		
			DEBUG(4, ("resolve_dfs_path: Redirecting %s because parent %s is dfs link\n", dfspath, localpath));

			/* To find the path consumed, we truncate the original
			   DFS pathname passed to use to remove the last
			   component. The length of the resulting string is
			   the path consumed 
			*/
			
			if (consumedcntp) {
				char *q;
				pstring buf;
				pstrcpy(buf, dfspath);
				trim_char(buf, '\0', '\\');
				for (; consumed_level; consumed_level--) {
					q = strrchr_m(buf, '\\');
					if (q)
						*q = 0;
				}
				*consumedcntp = strlen(buf);
				DEBUG(10, ("resolve_dfs_path: Path consumed: %s (%d)\n", buf, *consumedcntp));
			}
			
			return True;
		}
		p = strrchr_m(reqpath, '/');
		consumed_level++;
	}
	
	return False;
}

/*****************************************************************
  Decides if a dfs pathname should be redirected or not.
  If not, the pathname is converted to a tcon-relative local unix path

  search_wcard_flag: this flag performs 2 functions bother related
  to searches.  See resolve_dfs_path() and parse_processed_dfs_path()
  for details.
*****************************************************************/

BOOL dfs_redirect( pstring pathname, connection_struct* conn, BOOL search_wcard_flag )
{
	struct dfs_path dp;
	
	if (!conn || !pathname)
		return False;

	parse_processed_dfs_path(pathname, &dp, search_wcard_flag);

	/* if dfs pathname for a non-dfs share, convert to tcon-relative
	   path and return false */
	if (!lp_msdfs_root(SNUM(conn))) {
		pstrcpy(pathname, dp.reqpath);
		return False;
	}
	
	if (!strequal(dp.servicename, lp_servicename(SNUM(conn)) )) 
		return False;

	if (resolve_dfs_path(pathname, &dp, conn, search_wcard_flag,
			     NULL, NULL, NULL, NULL)) {
		DEBUG(3,("dfs_redirect: Redirecting %s\n", pathname));
		return True;
	} else {
		DEBUG(3,("dfs_redirect: Not redirecting %s.\n", pathname));
		
		/* Form non-dfs tcon-relative path */
		pstrcpy(pathname, dp.reqpath);
		DEBUG(3,("dfs_redirect: Path converted to non-dfs path %s\n",
			 pathname));
		return False;
	}

	/* never reached */
}

/**********************************************************************
 Return a self referral.
**********************************************************************/

static BOOL self_ref(char *pathname, struct junction_map *jucn,
			int *consumedcntp, BOOL *self_referralp)
{
	struct referral *ref;

	if (self_referralp != NULL)
		*self_referralp = True;

	jucn->referral_count = 1;
	if((ref = SMB_MALLOC_P(struct referral)) == NULL) {
		DEBUG(0,("self_ref: malloc failed for referral\n"));
		return False;
	}

	pstrcpy(ref->alternate_path,pathname);
	ref->proximity = 0;
	ref->ttl = REFERRAL_TTL;
	jucn->referral_list = ref;
	if (consumedcntp)
		*consumedcntp = strlen(pathname);

	return True;
}

/**********************************************************************
 Gets valid referrals for a dfs path and fills up the
 junction_map structure
**********************************************************************/

BOOL get_referred_path(char *pathname, struct junction_map *jucn,
		       int *consumedcntp, BOOL *self_referralp)
{
	struct dfs_path dp;

	struct connection_struct conns;
	struct connection_struct* conn = &conns;
	pstring conn_path;
	int snum;
	BOOL ret = False;
	BOOL self_referral = False;

	if (!pathname || !jucn)
		return False;

	ZERO_STRUCT(conns);

	if (self_referralp)
		*self_referralp = False;
	else
		self_referralp = &self_referral;

	parse_dfs_path(pathname, &dp);

	/* Verify hostname in path */
	if ( !strequal(get_local_machine_name(), dp.hostname) ) {
		/* Hostname mismatch, check if one of our IP addresses */
		if (!ismyip(*interpret_addr2(dp.hostname))) {
			DEBUG(3, ("get_referred_path: Invalid hostname %s in path %s\n",
				dp.hostname, pathname));
			return False;
		}
	}

	pstrcpy(jucn->service_name, dp.servicename);
	pstrcpy(jucn->volume_name, dp.reqpath);

	/* Verify the share is a dfs root */
	snum = lp_servicenumber(jucn->service_name);
	if(snum < 0) {
		if ((snum = find_service(jucn->service_name)) < 0)
			return False;
	}

	if (!lp_msdfs_root(snum)) {
		DEBUG(3,("get_referred_path: .%s. in dfs path %s is not a dfs root.\n",
			 dp.servicename, pathname));
		goto out;
	}

	/*
	 * Self referrals are tested with a anonymous IPC connection and
	 * a GET_DFS_REFERRAL call to \\server\share. (which means dp.reqpath[0] points
	 * to an empty string). create_conn_struct cd's into the directory and will
	 * fail if it cannot (as the anonymous user). Cope with this.
	 */

	if (dp.reqpath[0] == '\0') {

		struct referral* ref;

		if (*lp_msdfs_proxy(snum) == '\0')
			return self_ref(pathname, jucn, consumedcntp,
					self_referralp);

		jucn->referral_count = 1;
		if ((ref = SMB_MALLOC_P(struct referral)) == NULL) {
			DEBUG(0, ("malloc failed for referral\n"));
			goto out;
		}

		pstrcpy(ref->alternate_path, lp_msdfs_proxy(snum));
		if (dp.reqpath[0] != '\0')
			pstrcat(ref->alternate_path, dp.reqpath);
		ref->proximity = 0;
		ref->ttl = REFERRAL_TTL;
		jucn->referral_list = ref;
		if (consumedcntp)
			*consumedcntp = strlen(pathname);
		ret = True;
		goto out;
	}

	pstrcpy(conn_path, lp_pathname(snum));
	if (!create_conn_struct(conn, snum, conn_path))
		return False;

	/* If not remote & not a self referral, return False */
	if (!resolve_dfs_path(pathname, &dp, conn, False, 
			      &jucn->referral_list, &jucn->referral_count,
			      self_referralp, consumedcntp)) {
		if (!*self_referralp) {
			DEBUG(3,("get_referred_path: No valid referrals for path %s\n", pathname));
			goto out;
		}
	}
	
	/* if self_referral, fill up the junction map */
	if (*self_referralp) {
		if (self_ref(pathname, jucn, consumedcntp, self_referralp) == False) {
			goto out;
		}
	}
	
	ret = True;

out:
	if (conn->mem_ctx)
		talloc_destroy( conn->mem_ctx );
	
	return ret;
}

static int setup_ver2_dfs_referral(char* pathname, char** ppdata, 
				   struct junction_map* junction,
				   int consumedcnt,
				   BOOL self_referral)
{
	char* pdata = *ppdata;

	unsigned char uni_requestedpath[1024];
	int uni_reqpathoffset1,uni_reqpathoffset2;
	int uni_curroffset;
	int requestedpathlen=0;
	int offset;
	int reply_size = 0;
	int i=0;

	DEBUG(10,("setting up version2 referral\nRequested path:\n"));

	requestedpathlen = rpcstr_push(uni_requestedpath, pathname, -1,
				       STR_TERMINATE);

	if (DEBUGLVL(10)) {
	    dump_data(0, (const char *) uni_requestedpath,requestedpathlen);
	}

	DEBUG(10,("ref count = %u\n",junction->referral_count));

	uni_reqpathoffset1 = REFERRAL_HEADER_SIZE + 
			VERSION2_REFERRAL_SIZE * junction->referral_count;

	uni_reqpathoffset2 = uni_reqpathoffset1 + requestedpathlen;

	uni_curroffset = uni_reqpathoffset2 + requestedpathlen;

	reply_size = REFERRAL_HEADER_SIZE + VERSION2_REFERRAL_SIZE*junction->referral_count +
					2 * requestedpathlen;
	DEBUG(10,("reply_size: %u\n",reply_size));

	/* add up the unicode lengths of all the referral paths */
	for(i=0;i<junction->referral_count;i++) {
		DEBUG(10,("referral %u : %s\n",i,junction->referral_list[i].alternate_path));
		reply_size += (strlen(junction->referral_list[i].alternate_path)+1)*2;
	}

	DEBUG(10,("reply_size = %u\n",reply_size));
	/* add the unexplained 0x16 bytes */
	reply_size += 0x16;

	pdata = SMB_REALLOC(pdata,reply_size);
	if(pdata == NULL) {
		DEBUG(0,("malloc failed for Realloc!\n"));
		return -1;
	} else
		*ppdata = pdata;

	/* copy in the dfs requested paths.. required for offset calculations */
	memcpy(pdata+uni_reqpathoffset1,uni_requestedpath,requestedpathlen);
	memcpy(pdata+uni_reqpathoffset2,uni_requestedpath,requestedpathlen);

	/* create the header */
	SSVAL(pdata,0,consumedcnt * 2); /* path consumed */
	SSVAL(pdata,2,junction->referral_count); /* number of referral in this pkt */
	if(self_referral)
		SIVAL(pdata,4,DFSREF_REFERRAL_SERVER | DFSREF_STORAGE_SERVER); 
	else
		SIVAL(pdata,4,DFSREF_STORAGE_SERVER);

	offset = 8;
	/* add the referral elements */
	for(i=0;i<junction->referral_count;i++) {
		struct referral* ref = &junction->referral_list[i];
		int unilen;

		SSVAL(pdata,offset,2); /* version 2 */
		SSVAL(pdata,offset+2,VERSION2_REFERRAL_SIZE);
		if(self_referral)
			SSVAL(pdata,offset+4,1);
		else
			SSVAL(pdata,offset+4,0);
		SSVAL(pdata,offset+6,0); /* ref_flags :use path_consumed bytes? */
		SIVAL(pdata,offset+8,ref->proximity);
		SIVAL(pdata,offset+12,ref->ttl);

		SSVAL(pdata,offset+16,uni_reqpathoffset1-offset);
		SSVAL(pdata,offset+18,uni_reqpathoffset2-offset);
		/* copy referred path into current offset */
		unilen = rpcstr_push(pdata+uni_curroffset, ref->alternate_path,
				     -1, STR_UNICODE);

		SSVAL(pdata,offset+20,uni_curroffset-offset);

		uni_curroffset += unilen;
		offset += VERSION2_REFERRAL_SIZE;
	}
	/* add in the unexplained 22 (0x16) bytes at the end */
	memset(pdata+uni_curroffset,'\0',0x16);
	return reply_size;
}

static int setup_ver3_dfs_referral(char* pathname, char** ppdata, 
				   struct junction_map* junction,
				   int consumedcnt,
				   BOOL self_referral)
{
	char* pdata = *ppdata;

	unsigned char uni_reqpath[1024];
	int uni_reqpathoffset1, uni_reqpathoffset2;
	int uni_curroffset;
	int reply_size = 0;

	int reqpathlen = 0;
	int offset,i=0;
	
	DEBUG(10,("setting up version3 referral\n"));

	reqpathlen = rpcstr_push(uni_reqpath, pathname, -1, STR_TERMINATE);
	
	if (DEBUGLVL(10)) {
	    dump_data(0, (char *) uni_reqpath,reqpathlen);
	}

	uni_reqpathoffset1 = REFERRAL_HEADER_SIZE + VERSION3_REFERRAL_SIZE * junction->referral_count;
	uni_reqpathoffset2 = uni_reqpathoffset1 + reqpathlen;
	reply_size = uni_curroffset = uni_reqpathoffset2 + reqpathlen;

	for(i=0;i<junction->referral_count;i++) {
		DEBUG(10,("referral %u : %s\n",i,junction->referral_list[i].alternate_path));
		reply_size += (strlen(junction->referral_list[i].alternate_path)+1)*2;
	}

	pdata = SMB_REALLOC(pdata,reply_size);
	if(pdata == NULL) {
		DEBUG(0,("version3 referral setup: malloc failed for Realloc!\n"));
		return -1;
	} else
		*ppdata = pdata;

	/* create the header */
	SSVAL(pdata,0,consumedcnt * 2); /* path consumed */
	SSVAL(pdata,2,junction->referral_count); /* number of referral */
	if(self_referral)
		SIVAL(pdata,4,DFSREF_REFERRAL_SERVER | DFSREF_STORAGE_SERVER); 
	else
		SIVAL(pdata,4,DFSREF_STORAGE_SERVER);
	
	/* copy in the reqpaths */
	memcpy(pdata+uni_reqpathoffset1,uni_reqpath,reqpathlen);
	memcpy(pdata+uni_reqpathoffset2,uni_reqpath,reqpathlen);
	
	offset = 8;
	for(i=0;i<junction->referral_count;i++) {
		struct referral* ref = &(junction->referral_list[i]);
		int unilen;

		SSVAL(pdata,offset,3); /* version 3 */
		SSVAL(pdata,offset+2,VERSION3_REFERRAL_SIZE);
		if(self_referral)
			SSVAL(pdata,offset+4,1);
		else
			SSVAL(pdata,offset+4,0);

		SSVAL(pdata,offset+6,0); /* ref_flags :use path_consumed bytes? */
		SIVAL(pdata,offset+8,ref->ttl);
	    
		SSVAL(pdata,offset+12,uni_reqpathoffset1-offset);
		SSVAL(pdata,offset+14,uni_reqpathoffset2-offset);
		/* copy referred path into current offset */
		unilen = rpcstr_push(pdata+uni_curroffset,ref->alternate_path,
				     -1, STR_UNICODE | STR_TERMINATE);
		SSVAL(pdata,offset+16,uni_curroffset-offset);
		/* copy 0x10 bytes of 00's in the ServiceSite GUID */
		memset(pdata+offset+18,'\0',16);

		uni_curroffset += unilen;
		offset += VERSION3_REFERRAL_SIZE;
	}
	return reply_size;
}

/******************************************************************
 * Set up the Dfs referral for the dfs pathname
 ******************************************************************/

int setup_dfs_referral(connection_struct *orig_conn, char *pathname, int max_referral_level, char** ppdata)
{
	struct junction_map junction;
	int consumedcnt;
	BOOL self_referral = False;
	pstring buf;
	int reply_size = 0;
	char *pathnamep = pathname;

	ZERO_STRUCT(junction);

	/* get the junction entry */
	if (!pathnamep)
		return -1;

	/* Trim pathname sent by client so it begins with only one backslash.
	   Two backslashes confuse some dfs clients
	 */
	while (pathnamep[0] == '\\' && pathnamep[1] == '\\')
		pathnamep++;

	pstrcpy(buf, pathnamep);
	/* The following call can change cwd. */
	if (!get_referred_path(buf, &junction, &consumedcnt, &self_referral)) {
		vfs_ChDir(orig_conn,orig_conn->connectpath);
		return -1;
	}
	vfs_ChDir(orig_conn,orig_conn->connectpath);
	
	if (!self_referral) {
		pathnamep[consumedcnt] = '\0';

		if( DEBUGLVL( 3 ) ) {
			int i=0;
			dbgtext("setup_dfs_referral: Path %s to alternate path(s):",pathnamep);
			for(i=0;i<junction.referral_count;i++)
				dbgtext(" %s",junction.referral_list[i].alternate_path);
			dbgtext(".\n");
		}
	}

	/* create the referral depeding on version */
	DEBUG(10,("max_referral_level :%d\n",max_referral_level));
	if(max_referral_level<2 || max_referral_level>3)
		max_referral_level = 2;

	switch(max_referral_level) {
	case 2:
		reply_size = setup_ver2_dfs_referral(pathnamep, ppdata, &junction, 
						     consumedcnt, self_referral);
		SAFE_FREE(junction.referral_list);
		break;
	case 3:
		reply_size = setup_ver3_dfs_referral(pathnamep, ppdata, &junction, 
						     consumedcnt, self_referral);
		SAFE_FREE(junction.referral_list);
		break;
	default:
		DEBUG(0,("setup_dfs_referral: Invalid dfs referral version: %d\n", max_referral_level));
		return -1;
	}
      
	if (DEBUGLVL(10)) {
	    DEBUGADD(0,("DFS Referral pdata:\n"));
	    dump_data(0,*ppdata,reply_size);
	}

	return reply_size;
}

/**********************************************************************
 The following functions are called by the NETDFS RPC pipe functions
 **********************************************************************/

/**********************************************************************
 Creates a junction structure from a Dfs pathname
 **********************************************************************/

BOOL create_junction(char* pathname, struct junction_map* jucn)
{
        struct dfs_path dp;
 
        parse_dfs_path(pathname,&dp);

        /* check if path is dfs : validate first token */
        if ( !strequal(get_local_machine_name(),dp.hostname) ) {
	    
	   /* Hostname mismatch, check if one of our IP addresses */
	   if (!ismyip(*interpret_addr2(dp.hostname))) {
                DEBUG(4,("create_junction: Invalid hostname %s in dfs path %s\n",
			 dp.hostname, pathname));
                return False;
	   }
        }

        /* Check for a non-DFS share */
        if(!lp_msdfs_root(lp_servicenumber(dp.servicename))) {
                DEBUG(4,("create_junction: %s is not an msdfs root.\n", 
			 dp.servicename));
                return False;
        }

        pstrcpy(jucn->service_name,dp.servicename);
        pstrcpy(jucn->volume_name,dp.reqpath);
        return True;
}

/**********************************************************************
 Forms a valid Unix pathname from the junction 
 **********************************************************************/

static BOOL junction_to_local_path(struct junction_map* jucn, char* path,
				   int max_pathlen, connection_struct *conn)
{
	int snum;
	pstring conn_path;

	if(!path || !jucn)
		return False;

	snum = lp_servicenumber(jucn->service_name);
	if(snum < 0)
		return False;

	safe_strcpy(path, lp_pathname(snum), max_pathlen-1);
	safe_strcat(path, "/", max_pathlen-1);
	safe_strcat(path, jucn->volume_name, max_pathlen-1);

	pstrcpy(conn_path, lp_pathname(snum));
	if (!create_conn_struct(conn, snum, conn_path))
		return False;

	return True;
}

BOOL create_msdfs_link(struct junction_map *jucn, BOOL exists)
{
	pstring path;
	pstring msdfs_link;
	connection_struct conns;
 	connection_struct *conn = &conns;
	int i=0;
	BOOL insert_comma = False;
	BOOL ret = False;

	if(!junction_to_local_path(jucn, path, sizeof(path), conn))
		return False;
  
	/* form the msdfs_link contents */
	pstrcpy(msdfs_link, "msdfs:");
	for(i=0; i<jucn->referral_count; i++) {
		char* refpath = jucn->referral_list[i].alternate_path;
      
		trim_char(refpath, '\\', '\\');
		if(*refpath == '\0') {
			if (i == 0)
				insert_comma = False;
			continue;
		}
		if (i > 0 && insert_comma)
			pstrcat(msdfs_link, ",");

		pstrcat(msdfs_link, refpath);
		if (!insert_comma)
			insert_comma = True;
		
	}

	DEBUG(5,("create_msdfs_link: Creating new msdfs link: %s -> %s\n", path, msdfs_link));

	if(exists)
		if(SMB_VFS_UNLINK(conn,path)!=0)
			goto out;

	if(SMB_VFS_SYMLINK(conn, msdfs_link, path) < 0) {
		DEBUG(1,("create_msdfs_link: symlink failed %s -> %s\nError: %s\n", 
				path, msdfs_link, strerror(errno)));
		goto out;
	}
	
	
	ret = True;
	
out:
	talloc_destroy( conn->mem_ctx );
	return ret;
}

BOOL remove_msdfs_link(struct junction_map* jucn)
{
	pstring path;
	connection_struct conns;
 	connection_struct *conn = &conns;
	BOOL ret = False;

	if( junction_to_local_path(jucn, path, sizeof(path), conn) ) {
		if( SMB_VFS_UNLINK(conn, path) == 0 )
			ret = True;

		talloc_destroy( conn->mem_ctx );
	}
	
	return ret;
}

static int form_junctions(int snum, struct junction_map* jucn, int jn_remain)
{
	int cnt = 0;
	DIR *dirp;
	char* dname;
	pstring connect_path;
	char* service_name = lp_servicename(snum);
	connection_struct conn;
	struct referral *ref = NULL;
 
	if (jn_remain <= 0)
	    return(0);

	pstrcpy(connect_path,lp_pathname(snum));

	if(*connect_path == '\0')
		return 0;

	/*
	 * Fake up a connection struct for the VFS layer.
	 */

	if (!create_conn_struct(&conn, snum, connect_path))
		return 0;

	/* form a junction for the msdfs root - convention 
	   DO NOT REMOVE THIS: NT clients will not work with us
	   if this is not present
	*/ 
	pstrcpy(jucn[cnt].service_name, service_name);
	jucn[cnt].volume_name[0] = '\0';
	jucn[cnt].referral_count = 1;

	ref = jucn[cnt].referral_list = SMB_MALLOC_P(struct referral);
	if (jucn[cnt].referral_list == NULL) {
		DEBUG(0, ("Malloc failed!\n"));
		goto out;
	}

	ref->proximity = 0;
	ref->ttl = REFERRAL_TTL;
	if (*lp_msdfs_proxy(snum) != '\0') {
		pstrcpy(ref->alternate_path, lp_msdfs_proxy(snum));
		goto out;
	}
		
	slprintf(ref->alternate_path, sizeof(pstring)-1,
		 "\\\\%s\\%s", get_local_machine_name(), service_name);
	cnt++;

	/* Now enumerate all dfs links */
	dirp = SMB_VFS_OPENDIR(&conn, ".", NULL, 0);
	if(!dirp)
		goto out;

	while ((dname = vfs_readdirname(&conn, dirp)) != NULL) {
		if (cnt >= jn_remain) {
			SMB_VFS_CLOSEDIR(&conn,dirp);
			DEBUG(2, ("ran out of MSDFS junction slots"));
			goto out;
		}
		if (is_msdfs_link(&conn, dname, &(jucn[cnt].referral_list),
				  &(jucn[cnt].referral_count), NULL)) {
			pstrcpy(jucn[cnt].service_name, service_name);
			pstrcpy(jucn[cnt].volume_name, dname);
			cnt++;
		}
	}
	
	SMB_VFS_CLOSEDIR(&conn,dirp);
out:
	conn_free(&conn);
	return cnt;
}

int enum_msdfs_links(struct junction_map* jucn, int jn_max)
{
	int i=0;
	int jn_count = 0;

	if(!lp_host_msdfs())
		return 0;

	for(i=0;i < lp_numservices() && (jn_max - jn_count) > 0;i++) {
		if(lp_msdfs_root(i)) 
			jn_count += form_junctions(i,jucn,jn_max - jn_count);
	}
	return jn_count;
}