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source: branches/samba-3.2.x/source/smbd/msdfs.c@ 205

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Last change on this file since 205 was 138, checked in by Paul Smedley, 17 years ago
Update source to 3.2.0 GA level
File size: 42.7 KB

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1	/*
2	Unix SMB/Netbios implementation.
3	Version 3.0
4	MSDFS services for Samba
5	Copyright (C) Shirish Kalele 2000
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
23	#define DBGC_CLASS DBGC_MSDFS
24	#include "includes.h"
25
26	extern uint32 global_client_caps;
27
28	/**********************************************************************
29	Parse a DFS pathname of the form \hostname\service\reqpath
30	into the dfs_path structure.
31	If POSIX pathnames is true, the pathname may also be of the
32	form /hostname/service/reqpath.
33	We cope with either here.
34
35	Unfortunately, due to broken clients who might set the
36	SVAL(inbuf,smb_flg2) & FLAGS2_DFS_PATHNAMES bit and then
37	send a local path, we have to cope with that too....
38
39	If conn != NULL then ensure the provided service is
40	the one pointed to by the connection.
41
42	This version does everything using pointers within one copy of the
43	pathname string, talloced on the struct dfs_path pointer (which
44	must be talloced). This may be too clever to live....
45	JRA.
46	**********************************************************************/
47
48	static NTSTATUS parse_dfs_path(connection_struct *conn,
49	const char *pathname,
50	bool allow_wcards,
51	struct dfs_path pdp, / MUST BE TALLOCED */
52	bool *ppath_contains_wcard)
53	{
54	char *pathname_local;
55	char p,temp;
56	char *servicename;
57	char *eos_ptr;
58	NTSTATUS status = NT_STATUS_OK;
59	char sepchar;
60
61	ZERO_STRUCTP(pdp);
62
63	/*
64	* This is the only talloc we should need to do
65	* on the struct dfs_path. All the pointers inside
66	* it should point to offsets within this string.
67	*/
68
69	pathname_local = talloc_strdup(pdp, pathname);
70	if (!pathname_local) {
71	return NT_STATUS_NO_MEMORY;
72	}
73	/* Get a pointer to the terminating '\0' */
74	eos_ptr = &pathname_local[strlen(pathname_local)];
75	p = temp = pathname_local;
76
77	pdp->posix_path = (lp_posix_pathnames() && *pathname == '/');
78
79	sepchar = pdp->posix_path ? '/' : '\\';
80
81	if (*pathname != sepchar) {
82	DEBUG(10,("parse_dfs_path: path %s doesn't start with %c\n",
83	pathname, sepchar ));
84	/*
85	* Possibly client sent a local path by mistake.
86	* Try and convert to a local path.
87	*/
88
89	pdp->hostname = eos_ptr; /* "" */
90	pdp->servicename = eos_ptr; /* "" */
91
92	/* We've got no info about separators. */
93	pdp->posix_path = lp_posix_pathnames();
94	p = temp;
95	DEBUG(10,("parse_dfs_path: trying to convert %s to a "
96	"local path\n",
97	temp));
98	goto local_path;
99	}
100
101	/*
102	* Safe to use on talloc'ed string as it only shrinks.
103	* It also doesn't affect the eos_ptr.
104	*/
105	trim_char(temp,sepchar,sepchar);
106
107	DEBUG(10,("parse_dfs_path: temp = \|%s\| after trimming %c's\n",
108	temp, sepchar));
109
110	/* Now tokenize. */
111	/* Parse out hostname. */
112	p = strchr_m(temp,sepchar);
113	if(p == NULL) {
114	DEBUG(10,("parse_dfs_path: can't parse hostname from path %s\n",
115	temp));
116	/*
117	* Possibly client sent a local path by mistake.
118	* Try and convert to a local path.
119	*/
120
121	pdp->hostname = eos_ptr; /* "" */
122	pdp->servicename = eos_ptr; /* "" */
123
124	p = temp;
125	DEBUG(10,("parse_dfs_path: trying to convert %s "
126	"to a local path\n",
127	temp));
128	goto local_path;
129	}
130	*p = '\0';
131	pdp->hostname = temp;
132
133	DEBUG(10,("parse_dfs_path: hostname: %s\n",pdp->hostname));
134
135	/* Parse out servicename. */
136	servicename = p+1;
137	p = strchr_m(servicename,sepchar);
138	if (p) {
139	*p = '\0';
140	}
141
142	/* Is this really our servicename ? */
143	if (conn && !( strequal(servicename, lp_servicename(SNUM(conn)))
144	\|\| (strequal(servicename, HOMES_NAME)
145	&& strequal(lp_servicename(SNUM(conn)),
146	get_current_username()) )) ) {
147	DEBUG(10,("parse_dfs_path: %s is not our servicename\n",
148	servicename));
149
150	/*
151	* Possibly client sent a local path by mistake.
152	* Try and convert to a local path.
153	*/
154
155	pdp->hostname = eos_ptr; /* "" */
156	pdp->servicename = eos_ptr; /* "" */
157
158	/* Repair the path - replace the sepchar's
159	we nulled out */
160	servicename--;
161	*servicename = sepchar;
162	if (p) {
163	*p = sepchar;
164	}
165
166	p = temp;
167	DEBUG(10,("parse_dfs_path: trying to convert %s "
168	"to a local path\n",
169	temp));
170	goto local_path;
171	}
172
173	pdp->servicename = servicename;
174
175	DEBUG(10,("parse_dfs_path: servicename: %s\n",pdp->servicename));
176
177	if(p == NULL) {
178	/* Client sent self referral \server\share. */
179	pdp->reqpath = eos_ptr; /* "" */
180	return NT_STATUS_OK;
181	}
182
183	p++;
184
185	local_path:
186
187	*ppath_contains_wcard = False;
188
189	pdp->reqpath = p;
190
191	/* Rest is reqpath. */
192	if (pdp->posix_path) {
193	status = check_path_syntax_posix(pdp->reqpath);
194	} else {
195	if (allow_wcards) {
196	status = check_path_syntax_wcard(pdp->reqpath,
197	ppath_contains_wcard);
198	} else {
199	status = check_path_syntax(pdp->reqpath);
200	}
201	}
202
203	if (!NT_STATUS_IS_OK(status)) {
204	DEBUG(10,("parse_dfs_path: '%s' failed with %s\n",
205	p, nt_errstr(status) ));
206	return status;
207	}
208
209	DEBUG(10,("parse_dfs_path: rest of the path: %s\n",pdp->reqpath));
210	return NT_STATUS_OK;
211	}
212
213	/********************************************************
214	Fake up a connection struct for the VFS layer.
215	Note this CHANGES CWD !!!! JRA.
216	*********************************************************/
217
218	static NTSTATUS create_conn_struct(TALLOC_CTX *ctx,
219	connection_struct *conn,
220	int snum,
221	const char *path)
222	{
223	char *connpath;
224
225	ZERO_STRUCTP(conn);
226
227	connpath = talloc_strdup(ctx, path);
228	if (!connpath) {
229	return NT_STATUS_NO_MEMORY;
230	}
231	connpath = talloc_string_sub(ctx,
232	connpath,
233	"%S",
234	lp_servicename(snum));
235	if (!connpath) {
236	return NT_STATUS_NO_MEMORY;
237	}
238
239	/* needed for smbd_vfs_init() */
240
241	if ((conn->mem_ctx=talloc_init("connection_struct")) == NULL) {
242	DEBUG(0,("talloc_init(connection_struct) failed!\n"));
243	return NT_STATUS_NO_MEMORY;
244	}
245
246	if (!(conn->params = TALLOC_ZERO_P(conn->mem_ctx,
247	struct share_params))) {
248	DEBUG(0, ("TALLOC failed\n"));
249	return NT_STATUS_NO_MEMORY;
250	}
251
252	conn->params->service = snum;
253
254	set_conn_connectpath(conn, connpath);
255
256	if (!smbd_vfs_init(conn)) {
257	NTSTATUS status = map_nt_error_from_unix(errno);
258	DEBUG(0,("create_conn_struct: smbd_vfs_init failed.\n"));
259	conn_free_internal(conn);
260	return status;
261	}
262
263	/*
264	* Windows seems to insist on doing trans2getdfsreferral() calls on
265	* the IPC$ share as the anonymous user. If we try to chdir as that
266	* user we will fail.... WTF ? JRA.
267	*/
268
269	if (vfs_ChDir(conn,conn->connectpath) != 0) {
270	NTSTATUS status = map_nt_error_from_unix(errno);
271	DEBUG(3,("create_conn_struct: Can't ChDir to new conn path %s. "
272	"Error was %s\n",
273	conn->connectpath, strerror(errno) ));
274	conn_free_internal(conn);
275	return status;
276	}
277
278	return NT_STATUS_OK;
279	}
280
281	/**********************************************************************
282	Parse the contents of a symlink to verify if it is an msdfs referral
283	A valid referral is of the form:
284
285	msdfs:server1\share1,server2\share2
286	msdfs:server1\share1\pathname,server2\share2\pathname
287	msdfs:server1/share1,server2/share2
288	msdfs:server1/share1/pathname,server2/share2/pathname.
289
290	Note that the alternate paths returned here must be of the canonicalized
291	form:
292
293	\server\share or
294	\server\share\path\to\file,
295
296	even in posix path mode. This is because we have no knowledge if the
297	server we're referring to understands posix paths.
298	**********************************************************************/
299
300	static bool parse_msdfs_symlink(TALLOC_CTX *ctx,
301	const char *target,
302	struct referral **preflist,
303	int *refcount)
304	{
305	char *temp = NULL;
306	char *prot;
307	char **alt_path = NULL;
308	int count = 0, i;
309	struct referral *reflist;
310	char *saveptr;
311
312	temp = talloc_strdup(ctx, target);
313	if (!temp) {
314	return False;
315	}
316	prot = strtok_r(temp, ":", &saveptr);
317	if (!prot) {
318	DEBUG(0,("parse_msdfs_symlink: invalid path !\n"));
319	return False;
320	}
321
322	alt_path = TALLOC_ARRAY(ctx, char *, MAX_REFERRAL_COUNT);
323	if (!alt_path) {
324	return False;
325	}
326
327	/* parse out the alternate paths */
328	while((count<MAX_REFERRAL_COUNT) &&
329	((alt_path[count] = strtok_r(NULL, ",", &saveptr)) != NULL)) {
330	count++;
331	}
332
333	DEBUG(10,("parse_msdfs_symlink: count=%d\n", count));
334
335	if (count) {
336	reflist = *preflist = TALLOC_ZERO_ARRAY(ctx,
337	struct referral, count);
338	if(reflist == NULL) {
339	TALLOC_FREE(alt_path);
340	return False;
341	}
342	} else {
343	reflist = *preflist = NULL;
344	}
345
346	for(i=0;i<count;i++) {
347	char *p;
348
349	/* Canonicalize link target.
350	* Replace all /'s in the path by a \ */
351	string_replace(alt_path[i], '/', '\\');
352
353	/* Remove leading '\\'s */
354	p = alt_path[i];
355	while (p && (p == '\\')) {
356	p++;
357	}
358
359	reflist[i].alternate_path = talloc_asprintf(ctx,
360	"\\%s",
361	p);
362	if (!reflist[i].alternate_path) {
363	return False;
364	}
365
366	reflist[i].proximity = 0;
367	reflist[i].ttl = REFERRAL_TTL;
368	DEBUG(10, ("parse_msdfs_symlink: Created alt path: %s\n",
369	reflist[i].alternate_path));
370	}
371
372	*refcount = count;
373
374	TALLOC_FREE(alt_path);
375	return True;
376	}
377
378	/**********************************************************************
379	Returns true if the unix path is a valid msdfs symlink and also
380	returns the target string from inside the link.
381	**********************************************************************/
382
383	static bool is_msdfs_link_internal(TALLOC_CTX *ctx,
384	connection_struct *conn,
385	const char *path,
386	char **pp_link_target,
387	SMB_STRUCT_STAT *sbufp)
388	{
389	SMB_STRUCT_STAT st;
390	int referral_len = 0;
391	char link_target_buf[7];
392	size_t bufsize = 0;
393	char *link_target = NULL;
394
395	if (pp_link_target) {
396	bufsize = 1024;
397	link_target = TALLOC_ARRAY(ctx, char, bufsize);
398	if (!link_target) {
399	return False;
400	}
401	*pp_link_target = link_target;
402	} else {
403	bufsize = sizeof(link_target_buf);
404	link_target = link_target_buf;
405	}
406
407	if (sbufp == NULL) {
408	sbufp = &st;
409	}
410
411	if (SMB_VFS_LSTAT(conn, path, sbufp) != 0) {
412	DEBUG(5,("is_msdfs_link_read_target: %s does not exist.\n",
413	path));
414	goto err;
415	}
416
417	if (!S_ISLNK(sbufp->st_mode)) {
418	DEBUG(5,("is_msdfs_link_read_target: %s is not a link.\n",
419	path));
420	goto err;
421	}
422
423	referral_len = SMB_VFS_READLINK(conn, path, link_target, bufsize - 1);
424	if (referral_len == -1) {
425	DEBUG(0,("is_msdfs_link_read_target: Error reading "
426	"msdfs link %s: %s\n",
427	path, strerror(errno)));
428	goto err;
429	}
430	link_target[referral_len] = '\0';
431
432	DEBUG(5,("is_msdfs_link_internal: %s -> %s\n",path,
433	link_target));
434
435	if (!strnequal(link_target, "msdfs:", 6)) {
436	goto err;
437	}
438	return True;
439
440	err:
441
442	if (link_target != link_target_buf) {
443	TALLOC_FREE(link_target);
444	}
445	return False;
446	}
447
448	/**********************************************************************
449	Returns true if the unix path is a valid msdfs symlink.
450	**********************************************************************/
451
452	bool is_msdfs_link(connection_struct *conn,
453	const char *path,
454	SMB_STRUCT_STAT *sbufp)
455	{
456	return is_msdfs_link_internal(talloc_tos(),
457	conn,
458	path,
459	NULL,
460	sbufp);
461	}
462
463	/*****************************************************************
464	Used by other functions to decide if a dfs path is remote,
465	and to get the list of referred locations for that remote path.
466
467	search_flag: For findfirsts, dfs links themselves are not
468	redirected, but paths beyond the links are. For normal smb calls,
469	even dfs links need to be redirected.
470
471	consumedcntp: how much of the dfs path is being redirected. the client
472	should try the remaining path on the redirected server.
473
474	If this returns NT_STATUS_PATH_NOT_COVERED the contents of the msdfs
475	link redirect are in targetpath.
476	*****************************************************************/
477
478	static NTSTATUS dfs_path_lookup(TALLOC_CTX *ctx,
479	connection_struct *conn,
480	const char dfspath, / Incoming complete dfs path */
481	const struct dfs_path pdp, / Parsed out
482	server+share+extrapath. */
483	bool search_flag, /* Called from a findfirst ? */
484	int *consumedcntp,
485	char **pp_targetpath)
486	{
487	char *p = NULL;
488	char *q = NULL;
489	SMB_STRUCT_STAT sbuf;
490	NTSTATUS status;
491	char *localpath = NULL;
492	char canon_dfspath = NULL; / Canonicalized dfs path. (only '/'
493	components). */
494
495	DEBUG(10,("dfs_path_lookup: Conn path = %s reqpath = %s\n",
496	conn->connectpath, pdp->reqpath));
497
498	/*
499	* Note the unix path conversion here we're doing we can
500	* throw away. We're looking for a symlink for a dfs
501	* resolution, if we don't find it we'll do another
502	* unix_convert later in the codepath.
503	* If we needed to remember what we'd resolved in
504	* dp->reqpath (as the original code did) we'd
505	* copy (localhost, dp->reqpath) on any code
506	* path below that returns True - but I don't
507	* think this is needed. JRA.
508	*/
509
510	status = unix_convert(ctx, conn, pdp->reqpath, search_flag, &localpath,
511	NULL, &sbuf);
512	if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status,
513	NT_STATUS_OBJECT_PATH_NOT_FOUND)) {
514	return status;
515	}
516
517	/* Optimization - check if we can redirect the whole path. */
518
519	if (is_msdfs_link_internal(ctx, conn, localpath, pp_targetpath, NULL)) {
520	if (search_flag) {
521	DEBUG(6,("dfs_path_lookup (FindFirst) No redirection "
522	"for dfs link %s.\n", dfspath));
523	return NT_STATUS_OK;
524	}
525
526	DEBUG(6,("dfs_path_lookup: %s resolves to a "
527	"valid dfs link %s.\n", dfspath,
528	pp_targetpath ? *pp_targetpath : ""));
529
530	if (consumedcntp) {
531	*consumedcntp = strlen(dfspath);
532	}
533	return NT_STATUS_PATH_NOT_COVERED;
534	}
535
536	/* Prepare to test only for '/' components in the given path,
537	* so if a Windows path replace all '\\' characters with '/'.
538	* For a POSIX DFS path we know all separators are already '/'. */
539
540	canon_dfspath = talloc_strdup(ctx, dfspath);
541	if (!canon_dfspath) {
542	return NT_STATUS_NO_MEMORY;
543	}
544	if (!pdp->posix_path) {
545	string_replace(canon_dfspath, '\\', '/');
546	}
547
548	/*
549	* localpath comes out of unix_convert, so it has
550	* no trailing backslash. Make sure that canon_dfspath hasn't either.
551	* Fix for bug #4860 from Jan Martin <Jan.Martin@rwedea.com>.
552	*/
553
554	trim_char(canon_dfspath,0,'/');
555
556	/*
557	* Redirect if any component in the path is a link.
558	* We do this by walking backwards through the
559	* local path, chopping off the last component
560	* in both the local path and the canonicalized
561	* DFS path. If we hit a DFS link then we're done.
562	*/
563
564	p = strrchr_m(localpath, '/');
565	if (consumedcntp) {
566	q = strrchr_m(canon_dfspath, '/');
567	}
568
569	while (p) {
570	*p = '\0';
571	if (q) {
572	*q = '\0';
573	}
574
575	if (is_msdfs_link_internal(ctx, conn,
576	localpath, pp_targetpath, NULL)) {
577	DEBUG(4, ("dfs_path_lookup: Redirecting %s because "
578	"parent %s is dfs link\n", dfspath, localpath));
579
580	if (consumedcntp) {
581	*consumedcntp = strlen(canon_dfspath);
582	DEBUG(10, ("dfs_path_lookup: Path consumed: %s "
583	"(%d)\n",
584	canon_dfspath,
585	*consumedcntp));
586	}
587
588	return NT_STATUS_PATH_NOT_COVERED;
589	}
590
591	/* Step back on the filesystem. */
592	p = strrchr_m(localpath, '/');
593
594	if (consumedcntp) {
595	/* And in the canonicalized dfs path. */
596	q = strrchr_m(canon_dfspath, '/');
597	}
598	}
599
600	return NT_STATUS_OK;
601	}
602
603	/*****************************************************************
604	Decides if a dfs pathname should be redirected or not.
605	If not, the pathname is converted to a tcon-relative local unix path
606
607	search_wcard_flag: this flag performs 2 functions both related
608	to searches. See resolve_dfs_path() and parse_dfs_path_XX()
609	for details.
610
611	This function can return NT_STATUS_OK, meaning use the returned path as-is
612	(mapped into a local path).
613	or NT_STATUS_NOT_COVERED meaning return a DFS redirect, or
614	any other NT_STATUS error which is a genuine error to be
615	returned to the client.
616	*****************************************************************/
617
618	static NTSTATUS dfs_redirect(TALLOC_CTX *ctx,
619	connection_struct *conn,
620	const char *path_in,
621	bool search_wcard_flag,
622	char **pp_path_out,
623	bool *ppath_contains_wcard)
624	{
625	NTSTATUS status;
626	struct dfs_path *pdp = TALLOC_P(ctx, struct dfs_path);
627
628	if (!pdp) {
629	return NT_STATUS_NO_MEMORY;
630	}
631
632	status = parse_dfs_path(conn, path_in, search_wcard_flag, pdp,
633	ppath_contains_wcard);
634	if (!NT_STATUS_IS_OK(status)) {
635	TALLOC_FREE(pdp);
636	return status;
637	}
638
639	if (pdp->reqpath[0] == '\0') {
640	TALLOC_FREE(pdp);
641	*pp_path_out = talloc_strdup(ctx, "");
642	if (!*pp_path_out) {
643	return NT_STATUS_NO_MEMORY;
644	}
645	DEBUG(5,("dfs_redirect: self-referral.\n"));
646	return NT_STATUS_OK;
647	}
648
649	/* If dfs pathname for a non-dfs share, convert to tcon-relative
650	path and return OK */
651
652	if (!lp_msdfs_root(SNUM(conn))) {
653	*pp_path_out = talloc_strdup(ctx, pdp->reqpath);
654	TALLOC_FREE(pdp);
655	if (!*pp_path_out) {
656	return NT_STATUS_NO_MEMORY;
657	}
658	return NT_STATUS_OK;
659	}
660
661	/* If it looked like a local path (zero hostname/servicename)
662	* just treat as a tcon-relative path. */
663
664	if (pdp->hostname[0] == '\0' && pdp->servicename[0] == '\0') {
665	*pp_path_out = talloc_strdup(ctx, pdp->reqpath);
666	TALLOC_FREE(pdp);
667	if (!*pp_path_out) {
668	return NT_STATUS_NO_MEMORY;
669	}
670	return NT_STATUS_OK;
671	}
672
673	status = dfs_path_lookup(ctx, conn, path_in, pdp,
674	search_wcard_flag, NULL, NULL);
675	if (!NT_STATUS_IS_OK(status)) {
676	if (NT_STATUS_EQUAL(status, NT_STATUS_PATH_NOT_COVERED)) {
677	DEBUG(3,("dfs_redirect: Redirecting %s\n", path_in));
678	} else {
679	DEBUG(10,("dfs_redirect: dfs_path_lookup "
680	"failed for %s with %s\n",
681	path_in, nt_errstr(status) ));
682	}
683	return status;
684	}
685
686	DEBUG(3,("dfs_redirect: Not redirecting %s.\n", path_in));
687
688	/* Form non-dfs tcon-relative path */
689	*pp_path_out = talloc_strdup(ctx, pdp->reqpath);
690	TALLOC_FREE(pdp);
691	if (!*pp_path_out) {
692	return NT_STATUS_NO_MEMORY;
693	}
694
695	DEBUG(3,("dfs_redirect: Path %s converted to non-dfs path %s\n",
696	path_in,
697	*pp_path_out));
698
699	return NT_STATUS_OK;
700	}
701
702	/**********************************************************************
703	Return a self referral.
704	**********************************************************************/
705
706	static NTSTATUS self_ref(TALLOC_CTX *ctx,
707	const char *dfs_path,
708	struct junction_map *jucn,
709	int *consumedcntp,
710	bool *self_referralp)
711	{
712	struct referral *ref;
713
714	*self_referralp = True;
715
716	jucn->referral_count = 1;
717	if((ref = TALLOC_ZERO_P(ctx, struct referral)) == NULL) {
718	return NT_STATUS_NO_MEMORY;
719	}
720
721	ref->alternate_path = talloc_strdup(ctx, dfs_path);
722	if (!ref->alternate_path) {
723	return NT_STATUS_NO_MEMORY;
724	}
725	ref->proximity = 0;
726	ref->ttl = REFERRAL_TTL;
727	jucn->referral_list = ref;
728	*consumedcntp = strlen(dfs_path);
729	return NT_STATUS_OK;
730	}
731
732	/**********************************************************************
733	Gets valid referrals for a dfs path and fills up the
734	junction_map structure.
735	**********************************************************************/
736
737	NTSTATUS get_referred_path(TALLOC_CTX *ctx,
738	const char *dfs_path,
739	struct junction_map *jucn,
740	int *consumedcntp,
741	bool *self_referralp)
742	{
743	struct connection_struct conns;
744	struct connection_struct *conn = &conns;
745	char *targetpath = NULL;
746	int snum;
747	NTSTATUS status = NT_STATUS_NOT_FOUND;
748	bool dummy;
749	struct dfs_path *pdp = TALLOC_P(ctx, struct dfs_path);
750
751	if (!pdp) {
752	return NT_STATUS_NO_MEMORY;
753	}
754
755	ZERO_STRUCT(conns);
756	*self_referralp = False;
757
758	status = parse_dfs_path(NULL, dfs_path, False, pdp, &dummy);
759	if (!NT_STATUS_IS_OK(status)) {
760	return status;
761	}
762
763	jucn->service_name = talloc_strdup(ctx, pdp->servicename);
764	jucn->volume_name = talloc_strdup(ctx, pdp->reqpath);
765	if (!jucn->service_name \|\| !jucn->volume_name) {
766	TALLOC_FREE(pdp);
767	return NT_STATUS_NO_MEMORY;
768	}
769
770	/* Verify the share is a dfs root */
771	snum = lp_servicenumber(jucn->service_name);
772	if(snum < 0) {
773	fstring service_name;
774	fstrcpy(service_name, jucn->service_name);
775	if ((snum = find_service(service_name)) < 0) {
776	return NT_STATUS_NOT_FOUND;
777	}
778	TALLOC_FREE(jucn->service_name);
779	jucn->service_name = talloc_strdup(ctx, service_name);
780	if (!jucn->service_name) {
781	TALLOC_FREE(pdp);
782	return NT_STATUS_NO_MEMORY;
783	}
784	}
785
786	if (!lp_msdfs_root(snum) && (*lp_msdfs_proxy(snum) == '\0')) {
787	DEBUG(3,("get_referred_path: \|%s\| in dfs path %s is not "
788	"a dfs root.\n",
789	pdp->servicename, dfs_path));
790	TALLOC_FREE(pdp);
791	return NT_STATUS_NOT_FOUND;
792	}
793
794	/*
795	* Self referrals are tested with a anonymous IPC connection and
796	* a GET_DFS_REFERRAL call to \\server\share. (which means
797	* dp.reqpath[0] points to an empty string). create_conn_struct cd's
798	* into the directory and will fail if it cannot (as the anonymous
799	* user). Cope with this.
800	*/
801
802	if (pdp->reqpath[0] == '\0') {
803	char *tmp;
804	struct referral *ref;
805
806	if (*lp_msdfs_proxy(snum) == '\0') {
807	TALLOC_FREE(pdp);
808	return self_ref(ctx,
809	dfs_path,
810	jucn,
811	consumedcntp,
812	self_referralp);
813	}
814
815	/*
816	* It's an msdfs proxy share. Redirect to
817	* the configured target share.
818	*/
819
820	jucn->referral_count = 1;
821	if ((ref = TALLOC_ZERO_P(ctx, struct referral)) == NULL) {
822	TALLOC_FREE(pdp);
823	return NT_STATUS_NO_MEMORY;
824	}
825
826	if (!(tmp = talloc_strdup(ctx, lp_msdfs_proxy(snum)))) {
827	TALLOC_FREE(pdp);
828	return NT_STATUS_NO_MEMORY;
829	}
830
831	trim_string(tmp, "\\", 0);
832
833	ref->alternate_path = talloc_asprintf(ctx, "\\%s", tmp);
834	TALLOC_FREE(tmp);
835
836	if (!ref->alternate_path) {
837	TALLOC_FREE(pdp);
838	return NT_STATUS_NO_MEMORY;
839	}
840
841	if (pdp->reqpath[0] != '\0') {
842	ref->alternate_path = talloc_asprintf_append(
843	ref->alternate_path,
844	"%s",
845	pdp->reqpath);
846	if (!ref->alternate_path) {
847	TALLOC_FREE(pdp);
848	return NT_STATUS_NO_MEMORY;
849	}
850	}
851	ref->proximity = 0;
852	ref->ttl = REFERRAL_TTL;
853	jucn->referral_list = ref;
854	*consumedcntp = strlen(dfs_path);
855	TALLOC_FREE(pdp);
856	return NT_STATUS_OK;
857	}
858
859	status = create_conn_struct(ctx, conn, snum, lp_pathname(snum));
860	if (!NT_STATUS_IS_OK(status)) {
861	TALLOC_FREE(pdp);
862	return status;
863	}
864
865	/* If this is a DFS path dfs_lookup should return
866	* NT_STATUS_PATH_NOT_COVERED. */
867
868	status = dfs_path_lookup(ctx, conn, dfs_path, pdp,
869	False, consumedcntp, &targetpath);
870
871	if (!NT_STATUS_EQUAL(status, NT_STATUS_PATH_NOT_COVERED)) {
872	DEBUG(3,("get_referred_path: No valid referrals for path %s\n",
873	dfs_path));
874	conn_free_internal(conn);
875	TALLOC_FREE(pdp);
876	return status;
877	}
878
879	/* We know this is a valid dfs link. Parse the targetpath. */
880	if (!parse_msdfs_symlink(ctx, targetpath,
881	&jucn->referral_list,
882	&jucn->referral_count)) {
883	DEBUG(3,("get_referred_path: failed to parse symlink "
884	"target %s\n", targetpath ));
885	conn_free_internal(conn);
886	TALLOC_FREE(pdp);
887	return NT_STATUS_NOT_FOUND;
888	}
889
890	conn_free_internal(conn);
891	TALLOC_FREE(pdp);
892	return NT_STATUS_OK;
893	}
894
895	static int setup_ver2_dfs_referral(const char *pathname,
896	char **ppdata,
897	struct junction_map *junction,
898	int consumedcnt,
899	bool self_referral)
900	{
901	char* pdata = *ppdata;
902
903	smb_ucs2_t *uni_requestedpath = NULL;
904	int uni_reqpathoffset1,uni_reqpathoffset2;
905	int uni_curroffset;
906	int requestedpathlen=0;
907	int offset;
908	int reply_size = 0;
909	int i=0;
910
911	DEBUG(10,("Setting up version2 referral\nRequested path:\n"));
912
913	requestedpathlen = rpcstr_push_talloc(talloc_tos(),
914	&uni_requestedpath, pathname);
915	if (uni_requestedpath == NULL \|\| requestedpathlen == 0) {
916	return -1;
917	}
918
919	if (DEBUGLVL(10)) {
920	dump_data(0, (unsigned char *)uni_requestedpath,
921	requestedpathlen);
922	}
923
924	DEBUG(10,("ref count = %u\n",junction->referral_count));
925
926	uni_reqpathoffset1 = REFERRAL_HEADER_SIZE +
927	VERSION2_REFERRAL_SIZE * junction->referral_count;
928
929	uni_reqpathoffset2 = uni_reqpathoffset1 + requestedpathlen;
930
931	uni_curroffset = uni_reqpathoffset2 + requestedpathlen;
932
933	reply_size = REFERRAL_HEADER_SIZE +
934	VERSION2_REFERRAL_SIZE*junction->referral_count +
935	2 * requestedpathlen;
936	DEBUG(10,("reply_size: %u\n",reply_size));
937
938	/* add up the unicode lengths of all the referral paths */
939	for(i=0;i<junction->referral_count;i++) {
940	DEBUG(10,("referral %u : %s\n",
941	i,
942	junction->referral_list[i].alternate_path));
943	reply_size +=
944	(strlen(junction->referral_list[i].alternate_path)+1)*2;
945	}
946
947	DEBUG(10,("reply_size = %u\n",reply_size));
948	/* add the unexplained 0x16 bytes */
949	reply_size += 0x16;
950
951	pdata = (char *)SMB_REALLOC(pdata,reply_size);
952	if(pdata == NULL) {
953	DEBUG(0,("Realloc failed!\n"));
954	return -1;
955	}
956	*ppdata = pdata;
957
958	/* copy in the dfs requested paths.. required for offset calculations */
959	memcpy(pdata+uni_reqpathoffset1,uni_requestedpath,requestedpathlen);
960	memcpy(pdata+uni_reqpathoffset2,uni_requestedpath,requestedpathlen);
961
962	/* create the header */
963	SSVAL(pdata,0,consumedcnt * 2); /* path consumed */
964	/* number of referral in this pkt */
965	SSVAL(pdata,2,junction->referral_count);
966	if(self_referral) {
967	SIVAL(pdata,4,DFSREF_REFERRAL_SERVER \| DFSREF_STORAGE_SERVER);
968	} else {
969	SIVAL(pdata,4,DFSREF_STORAGE_SERVER);
970	}
971
972	offset = 8;
973	/* add the referral elements */
974	for(i=0;i<junction->referral_count;i++) {
975	struct referral* ref = &junction->referral_list[i];
976	int unilen;
977
978	SSVAL(pdata,offset,2); /* version 2 */
979	SSVAL(pdata,offset+2,VERSION2_REFERRAL_SIZE);
980	if(self_referral) {
981	SSVAL(pdata,offset+4,1);
982	} else {
983	SSVAL(pdata,offset+4,0);
984	}
985
986	/* ref_flags :use path_consumed bytes? */
987	SSVAL(pdata,offset+6,0);
988	SIVAL(pdata,offset+8,ref->proximity);
989	SIVAL(pdata,offset+12,ref->ttl);
990
991	SSVAL(pdata,offset+16,uni_reqpathoffset1-offset);
992	SSVAL(pdata,offset+18,uni_reqpathoffset2-offset);
993	/* copy referred path into current offset */
994	unilen = rpcstr_push(pdata+uni_curroffset,
995	ref->alternate_path,
996	reply_size - uni_curroffset,
997	STR_UNICODE);
998
999	SSVAL(pdata,offset+20,uni_curroffset-offset);
1000
1001	uni_curroffset += unilen;
1002	offset += VERSION2_REFERRAL_SIZE;
1003	}
1004	/* add in the unexplained 22 (0x16) bytes at the end */
1005	memset(pdata+uni_curroffset,'\0',0x16);
1006	return reply_size;
1007	}
1008
1009	static int setup_ver3_dfs_referral(const char *pathname,
1010	char **ppdata,
1011	struct junction_map *junction,
1012	int consumedcnt,
1013	bool self_referral)
1014	{
1015	char pdata = ppdata;
1016
1017	smb_ucs2_t *uni_reqpath = NULL;
1018	int uni_reqpathoffset1, uni_reqpathoffset2;
1019	int uni_curroffset;
1020	int reply_size = 0;
1021
1022	int reqpathlen = 0;
1023	int offset,i=0;
1024
1025	DEBUG(10,("setting up version3 referral\n"));
1026
1027	reqpathlen = rpcstr_push_talloc(talloc_tos(), &uni_reqpath, pathname);
1028	if (uni_reqpath == NULL \|\| reqpathlen == 0) {
1029	return -1;
1030	}
1031
1032	if (DEBUGLVL(10)) {
1033	dump_data(0, (unsigned char *)uni_reqpath,
1034	reqpathlen);
1035	}
1036
1037	uni_reqpathoffset1 = REFERRAL_HEADER_SIZE +
1038	VERSION3_REFERRAL_SIZE * junction->referral_count;
1039	uni_reqpathoffset2 = uni_reqpathoffset1 + reqpathlen;
1040	reply_size = uni_curroffset = uni_reqpathoffset2 + reqpathlen;
1041
1042	for(i=0;i<junction->referral_count;i++) {
1043	DEBUG(10,("referral %u : %s\n",
1044	i,
1045	junction->referral_list[i].alternate_path));
1046	reply_size +=
1047	(strlen(junction->referral_list[i].alternate_path)+1)*2;
1048	}
1049
1050	pdata = (char *)SMB_REALLOC(pdata,reply_size);
1051	if(pdata == NULL) {
1052	DEBUG(0,("version3 referral setup:"
1053	"malloc failed for Realloc!\n"));
1054	return -1;
1055	}
1056	*ppdata = pdata;
1057
1058	/* create the header */
1059	SSVAL(pdata,0,consumedcnt * 2); /* path consumed */
1060	SSVAL(pdata,2,junction->referral_count); /* number of referral */
1061	if(self_referral) {
1062	SIVAL(pdata,4,DFSREF_REFERRAL_SERVER \| DFSREF_STORAGE_SERVER);
1063	} else {
1064	SIVAL(pdata,4,DFSREF_STORAGE_SERVER);
1065	}
1066
1067	/* copy in the reqpaths */
1068	memcpy(pdata+uni_reqpathoffset1,uni_reqpath,reqpathlen);
1069	memcpy(pdata+uni_reqpathoffset2,uni_reqpath,reqpathlen);
1070
1071	offset = 8;
1072	for(i=0;i<junction->referral_count;i++) {
1073	struct referral* ref = &(junction->referral_list[i]);
1074	int unilen;
1075
1076	SSVAL(pdata,offset,3); /* version 3 */
1077	SSVAL(pdata,offset+2,VERSION3_REFERRAL_SIZE);
1078	if(self_referral) {
1079	SSVAL(pdata,offset+4,1);
1080	} else {
1081	SSVAL(pdata,offset+4,0);
1082	}
1083
1084	/* ref_flags :use path_consumed bytes? */
1085	SSVAL(pdata,offset+6,0);
1086	SIVAL(pdata,offset+8,ref->ttl);
1087
1088	SSVAL(pdata,offset+12,uni_reqpathoffset1-offset);
1089	SSVAL(pdata,offset+14,uni_reqpathoffset2-offset);
1090	/* copy referred path into current offset */
1091	unilen = rpcstr_push(pdata+uni_curroffset,ref->alternate_path,
1092	reply_size - uni_curroffset,
1093	STR_UNICODE \| STR_TERMINATE);
1094	SSVAL(pdata,offset+16,uni_curroffset-offset);
1095	/* copy 0x10 bytes of 00's in the ServiceSite GUID */
1096	memset(pdata+offset+18,'\0',16);
1097
1098	uni_curroffset += unilen;
1099	offset += VERSION3_REFERRAL_SIZE;
1100	}
1101	return reply_size;
1102	}
1103
1104	/******************************************************************
1105	Set up the DFS referral for the dfs pathname. This call returns
1106	the amount of the path covered by this server, and where the
1107	client should be redirected to. This is the meat of the
1108	TRANS2_GET_DFS_REFERRAL call.
1109	******************************************************************/
1110
1111	int setup_dfs_referral(connection_struct *orig_conn,
1112	const char *dfs_path,
1113	int max_referral_level,
1114	char *ppdata, NTSTATUS pstatus)
1115	{
1116	struct junction_map *junction = NULL;
1117	int consumedcnt = 0;
1118	bool self_referral = False;
1119	int reply_size = 0;
1120	char *pathnamep = NULL;
1121	char *local_dfs_path = NULL;
1122	TALLOC_CTX *ctx;
1123
1124	if (!(ctx=talloc_init("setup_dfs_referral"))) {
1125	*pstatus = NT_STATUS_NO_MEMORY;
1126	return -1;
1127	}
1128
1129	/* get the junction entry */
1130	if (!dfs_path) {
1131	talloc_destroy(ctx);
1132	*pstatus = NT_STATUS_NOT_FOUND;
1133	return -1;
1134	}
1135
1136	/*
1137	* Trim pathname sent by client so it begins with only one backslash.
1138	* Two backslashes confuse some dfs clients
1139	*/
1140
1141	local_dfs_path = talloc_strdup(ctx,dfs_path);
1142	if (!local_dfs_path) {
1143	*pstatus = NT_STATUS_NO_MEMORY;
1144	talloc_destroy(ctx);
1145	return -1;
1146	}
1147	pathnamep = local_dfs_path;
1148	while (IS_DIRECTORY_SEP(pathnamep[0]) &&
1149	IS_DIRECTORY_SEP(pathnamep[1])) {
1150	pathnamep++;
1151	}
1152
1153	junction = TALLOC_ZERO_P(ctx, struct junction_map);
1154	if (!junction) {
1155	*pstatus = NT_STATUS_NO_MEMORY;
1156	talloc_destroy(ctx);
1157	return -1;
1158	}
1159
1160	/* The following call can change cwd. */
1161	*pstatus = get_referred_path(ctx, pathnamep, junction,
1162	&consumedcnt, &self_referral);
1163	if (!NT_STATUS_IS_OK(*pstatus)) {
1164	vfs_ChDir(orig_conn,orig_conn->connectpath);
1165	talloc_destroy(ctx);
1166	return -1;
1167	}
1168	vfs_ChDir(orig_conn,orig_conn->connectpath);
1169
1170	if (!self_referral) {
1171	pathnamep[consumedcnt] = '\0';
1172
1173	if( DEBUGLVL( 3 ) ) {
1174	int i=0;
1175	dbgtext("setup_dfs_referral: Path %s to "
1176	"alternate path(s):",
1177	pathnamep);
1178	for(i=0;i<junction->referral_count;i++)
1179	dbgtext(" %s",
1180	junction->referral_list[i].alternate_path);
1181	dbgtext(".\n");
1182	}
1183	}
1184
1185	/* create the referral depeding on version */
1186	DEBUG(10,("max_referral_level :%d\n",max_referral_level));
1187
1188	if (max_referral_level < 2) {
1189	max_referral_level = 2;
1190	}
1191	if (max_referral_level > 3) {
1192	max_referral_level = 3;
1193	}
1194
1195	switch(max_referral_level) {
1196	case 2:
1197	reply_size = setup_ver2_dfs_referral(pathnamep,
1198	ppdata, junction,
1199	consumedcnt, self_referral);
1200	break;
1201	case 3:
1202	reply_size = setup_ver3_dfs_referral(pathnamep, ppdata,
1203	junction, consumedcnt, self_referral);
1204	break;
1205	default:
1206	DEBUG(0,("setup_dfs_referral: Invalid dfs referral "
1207	"version: %d\n",
1208	max_referral_level));
1209	talloc_destroy(ctx);
1210	*pstatus = NT_STATUS_INVALID_LEVEL;
1211	return -1;
1212	}
1213
1214	if (DEBUGLVL(10)) {
1215	DEBUGADD(0,("DFS Referral pdata:\n"));
1216	dump_data(0,(uint8 )ppdata,reply_size);
1217	}
1218
1219	talloc_destroy(ctx);
1220	*pstatus = NT_STATUS_OK;
1221	return reply_size;
1222	}
1223
1224	/**********************************************************************
1225	The following functions are called by the NETDFS RPC pipe functions
1226	**********************************************************************/
1227
1228	/*********************************************************************
1229	Creates a junction structure from a DFS pathname
1230	**********************************************************************/
1231
1232	bool create_junction(TALLOC_CTX *ctx,
1233	const char *dfs_path,
1234	struct junction_map *jucn)
1235	{
1236	int snum;
1237	bool dummy;
1238	struct dfs_path *pdp = TALLOC_P(ctx,struct dfs_path);
1239	NTSTATUS status;
1240
1241	if (!pdp) {
1242	return False;
1243	}
1244	status = parse_dfs_path(NULL, dfs_path, False, pdp, &dummy);
1245	if (!NT_STATUS_IS_OK(status)) {
1246	return False;
1247	}
1248
1249	/* check if path is dfs : validate first token */
1250	if (!is_myname_or_ipaddr(pdp->hostname)) {
1251	DEBUG(4,("create_junction: Invalid hostname %s "
1252	"in dfs path %s\n",
1253	pdp->hostname, dfs_path));
1254	TALLOC_FREE(pdp);
1255	return False;
1256	}
1257
1258	/* Check for a non-DFS share */
1259	snum = lp_servicenumber(pdp->servicename);
1260
1261	if(snum < 0 \|\| !lp_msdfs_root(snum)) {
1262	DEBUG(4,("create_junction: %s is not an msdfs root.\n",
1263	pdp->servicename));
1264	TALLOC_FREE(pdp);
1265	return False;
1266	}
1267
1268	jucn->service_name = talloc_strdup(ctx, pdp->servicename);
1269	jucn->volume_name = talloc_strdup(ctx, pdp->reqpath);
1270	jucn->comment = talloc_strdup(ctx, lp_comment(snum));
1271
1272	TALLOC_FREE(pdp);
1273	if (!jucn->service_name \|\| !jucn->volume_name \|\| ! jucn->comment) {
1274	return False;
1275	}
1276	return True;
1277	}
1278
1279	/**********************************************************************
1280	Forms a valid Unix pathname from the junction
1281	**********************************************************************/
1282
1283	static bool junction_to_local_path(const struct junction_map *jucn,
1284	char **pp_path_out,
1285	connection_struct *conn_out)
1286	{
1287	int snum;
1288
1289	snum = lp_servicenumber(jucn->service_name);
1290	if(snum < 0) {
1291	return False;
1292	}
1293	if (!NT_STATUS_IS_OK(create_conn_struct(talloc_tos(),
1294	conn_out, snum,
1295	lp_pathname(snum)))) {
1296	return False;
1297	}
1298
1299	*pp_path_out = talloc_asprintf(conn_out->mem_ctx,
1300	"%s/%s",
1301	lp_pathname(snum),
1302	jucn->volume_name);
1303	if (!*pp_path_out) {
1304	return False;
1305	}
1306	return True;
1307	}
1308
1309	bool create_msdfs_link(const struct junction_map *jucn)
1310	{
1311	char *path = NULL;
1312	char *msdfs_link = NULL;
1313	connection_struct conns;
1314	connection_struct *conn = &conns;
1315	int i=0;
1316	bool insert_comma = False;
1317	bool ret = False;
1318
1319	ZERO_STRUCT(conns);
1320
1321	if(!junction_to_local_path(jucn, &path, conn)) {
1322	return False;
1323	}
1324
1325	/* Form the msdfs_link contents */
1326	msdfs_link = talloc_strdup(conn->mem_ctx, "msdfs:");
1327	if (!msdfs_link) {
1328	goto out;
1329	}
1330	for(i=0; i<jucn->referral_count; i++) {
1331	char *refpath = jucn->referral_list[i].alternate_path;
1332
1333	/* Alternate paths always use Windows separators. */
1334	trim_char(refpath, '\\', '\\');
1335	if(*refpath == '\0') {
1336	if (i == 0) {
1337	insert_comma = False;
1338	}
1339	continue;
1340	}
1341	if (i > 0 && insert_comma) {
1342	msdfs_link = talloc_asprintf_append_buffer(msdfs_link,
1343	",%s",
1344	refpath);
1345	} else {
1346	msdfs_link = talloc_asprintf_append_buffer(msdfs_link,
1347	"%s",
1348	refpath);
1349	}
1350
1351	if (!msdfs_link) {
1352	goto out;
1353	}
1354	if (!insert_comma) {
1355	insert_comma = True;
1356	}
1357	}
1358
1359	DEBUG(5,("create_msdfs_link: Creating new msdfs link: %s -> %s\n",
1360	path, msdfs_link));
1361
1362	if(SMB_VFS_SYMLINK(conn, msdfs_link, path) < 0) {
1363	if (errno == EEXIST) {
1364	if(SMB_VFS_UNLINK(conn,path)!=0) {
1365	goto out;
1366	}
1367	}
1368	if (SMB_VFS_SYMLINK(conn, msdfs_link, path) < 0) {
1369	DEBUG(1,("create_msdfs_link: symlink failed "
1370	"%s -> %s\nError: %s\n",
1371	path, msdfs_link, strerror(errno)));
1372	goto out;
1373	}
1374	}
1375
1376	ret = True;
1377
1378	out:
1379
1380	conn_free_internal(conn);
1381	return ret;
1382	}
1383
1384	bool remove_msdfs_link(const struct junction_map *jucn)
1385	{
1386	char *path = NULL;
1387	connection_struct conns;
1388	connection_struct *conn = &conns;
1389	bool ret = False;
1390
1391	ZERO_STRUCT(conns);
1392
1393	if( junction_to_local_path(jucn, &path, conn) ) {
1394	if( SMB_VFS_UNLINK(conn, path) == 0 ) {
1395	ret = True;
1396	}
1397	}
1398
1399	conn_free_internal(conn);
1400	return ret;
1401	}
1402
1403	/*********************************************************************
1404	Return the number of DFS links at the root of this share.
1405	*********************************************************************/
1406
1407	static int count_dfs_links(TALLOC_CTX *ctx, int snum)
1408	{
1409	size_t cnt = 0;
1410	SMB_STRUCT_DIR *dirp = NULL;
1411	char *dname = NULL;
1412	const char *connect_path = lp_pathname(snum);
1413	const char *msdfs_proxy = lp_msdfs_proxy(snum);
1414	connection_struct conn;
1415
1416	ZERO_STRUCT(conn);
1417
1418	if(*connect_path == '\0') {
1419	return 0;
1420	}
1421
1422	/*
1423	* Fake up a connection struct for the VFS layer.
1424	*/
1425
1426	if (!NT_STATUS_IS_OK(create_conn_struct(talloc_tos(),
1427	&conn, snum, connect_path))) {
1428	return 0;
1429	}
1430
1431	/* Count a link for the msdfs root - convention */
1432	cnt = 1;
1433
1434	/* No more links if this is an msdfs proxy. */
1435	if (*msdfs_proxy != '\0') {
1436	goto out;
1437	}
1438
1439	/* Now enumerate all dfs links */
1440	dirp = SMB_VFS_OPENDIR(&conn, ".", NULL, 0);
1441	if(!dirp) {
1442	goto out;
1443	}
1444
1445	while ((dname = vfs_readdirname(&conn, dirp)) != NULL) {
1446	if (is_msdfs_link(&conn,
1447	dname,
1448	NULL)) {
1449	cnt++;
1450	}
1451	}
1452
1453	SMB_VFS_CLOSEDIR(&conn,dirp);
1454
1455	out:
1456
1457	conn_free_internal(&conn);
1458	return cnt;
1459	}
1460
1461	/*********************************************************************
1462	*********************************************************************/
1463
1464	static int form_junctions(TALLOC_CTX *ctx,
1465	int snum,
1466	struct junction_map *jucn,
1467	size_t jn_remain)
1468	{
1469	size_t cnt = 0;
1470	SMB_STRUCT_DIR *dirp = NULL;
1471	char *dname = NULL;
1472	const char *connect_path = lp_pathname(snum);
1473	char *service_name = lp_servicename(snum);
1474	const char *msdfs_proxy = lp_msdfs_proxy(snum);
1475	connection_struct conn;
1476	struct referral *ref = NULL;
1477
1478	ZERO_STRUCT(conn);
1479
1480	if (jn_remain == 0) {
1481	return 0;
1482	}
1483
1484	if(*connect_path == '\0') {
1485	return 0;
1486	}
1487
1488	/*
1489	* Fake up a connection struct for the VFS layer.
1490	*/
1491
1492	if (!NT_STATUS_IS_OK(create_conn_struct(ctx, &conn, snum, connect_path))) {
1493	return 0;
1494	}
1495
1496	/* form a junction for the msdfs root - convention
1497	DO NOT REMOVE THIS: NT clients will not work with us
1498	if this is not present
1499	*/
1500	jucn[cnt].service_name = talloc_strdup(ctx,service_name);
1501	jucn[cnt].volume_name = talloc_strdup(ctx, "");
1502	if (!jucn[cnt].service_name \|\| !jucn[cnt].volume_name) {
1503	goto out;
1504	}
1505	jucn[cnt].comment = "";
1506	jucn[cnt].referral_count = 1;
1507
1508	ref = jucn[cnt].referral_list = TALLOC_ZERO_P(ctx, struct referral);
1509	if (jucn[cnt].referral_list == NULL) {
1510	goto out;
1511	}
1512
1513	ref->proximity = 0;
1514	ref->ttl = REFERRAL_TTL;
1515	if (*msdfs_proxy != '\0') {
1516	ref->alternate_path = talloc_strdup(ctx,
1517	msdfs_proxy);
1518	} else {
1519	ref->alternate_path = talloc_asprintf(ctx,
1520	"\\\\%s\\%s",
1521	get_local_machine_name(),
1522	service_name);
1523	}
1524
1525	if (!ref->alternate_path) {
1526	goto out;
1527	}
1528	cnt++;
1529
1530	/* Don't enumerate if we're an msdfs proxy. */
1531	if (*msdfs_proxy != '\0') {
1532	goto out;
1533	}
1534
1535	/* Now enumerate all dfs links */
1536	dirp = SMB_VFS_OPENDIR(&conn, ".", NULL, 0);
1537	if(!dirp) {
1538	goto out;
1539	}
1540
1541	while ((dname = vfs_readdirname(&conn, dirp)) != NULL) {
1542	char *link_target = NULL;
1543	if (cnt >= jn_remain) {
1544	DEBUG(2, ("form_junctions: ran out of MSDFS "
1545	"junction slots"));
1546	goto out;
1547	}
1548	if (is_msdfs_link_internal(ctx,
1549	&conn,
1550	dname, &link_target,
1551	NULL)) {
1552	if (parse_msdfs_symlink(ctx,
1553	link_target,
1554	&jucn[cnt].referral_list,
1555	&jucn[cnt].referral_count)) {
1556
1557	jucn[cnt].service_name = talloc_strdup(ctx,
1558	service_name);
1559	jucn[cnt].volume_name = talloc_strdup(ctx,
1560	dname);
1561	if (!jucn[cnt].service_name \|\|
1562	!jucn[cnt].volume_name) {
1563	goto out;
1564	}
1565	jucn[cnt].comment = "";
1566	cnt++;
1567	}
1568	TALLOC_FREE(link_target);
1569	}
1570	}
1571
1572	out:
1573
1574	if (dirp) {
1575	SMB_VFS_CLOSEDIR(&conn,dirp);
1576	}
1577
1578	conn_free_internal(&conn);
1579	return cnt;
1580	}
1581
1582	struct junction_map enum_msdfs_links(TALLOC_CTX ctx, size_t *p_num_jn)
1583	{
1584	struct junction_map *jn = NULL;
1585	int i=0;
1586	size_t jn_count = 0;
1587	int sharecount = 0;
1588
1589	*p_num_jn = 0;
1590	if(!lp_host_msdfs()) {
1591	return NULL;
1592	}
1593
1594	/* Ensure all the usershares are loaded. */
1595	become_root();
1596	load_registry_shares();
1597	sharecount = load_usershare_shares();
1598	unbecome_root();
1599
1600	for(i=0;i < sharecount;i++) {
1601	if(lp_msdfs_root(i)) {
1602	jn_count += count_dfs_links(ctx, i);
1603	}
1604	}
1605	if (jn_count == 0) {
1606	return NULL;
1607	}
1608	jn = TALLOC_ARRAY(ctx, struct junction_map, jn_count);
1609	if (!jn) {
1610	return NULL;
1611	}
1612	for(i=0; i < sharecount; i++) {
1613	if (*p_num_jn >= jn_count) {
1614	break;
1615	}
1616	if(lp_msdfs_root(i)) {
1617	*p_num_jn += form_junctions(ctx, i,
1618	&jn[*p_num_jn],
1619	jn_count - *p_num_jn);
1620	}
1621	}
1622	return jn;
1623	}
1624
1625	/******************************************************************************
1626	Core function to resolve a dfs pathname.
1627	******************************************************************************/
1628
1629	NTSTATUS resolve_dfspath(TALLOC_CTX *ctx,
1630	connection_struct *conn,
1631	bool dfs_pathnames,
1632	const char *name_in,
1633	char **pp_name_out)
1634	{
1635	NTSTATUS status = NT_STATUS_OK;
1636	bool dummy;
1637	if (dfs_pathnames) {
1638	status = dfs_redirect(ctx,
1639	conn,
1640	name_in,
1641	False,
1642	pp_name_out,
1643	&dummy);
1644	} else {
1645	/*
1646	* Cheat and just return a copy of the in ptr.
1647	* Once srvstr_get_path() uses talloc it'll
1648	* be a talloced ptr anyway.
1649	*/
1650	pp_name_out = CONST_DISCARD(char ,name_in);
1651	}
1652	return status;
1653	}
1654
1655	/******************************************************************************
1656	Core function to resolve a dfs pathname possibly containing a wildcard.
1657	This function is identical to the above except for the bool param to
1658	dfs_redirect but I need this to be separate so it's really clear when
1659	we're allowing wildcards and when we're not. JRA.
1660	******************************************************************************/
1661
1662	NTSTATUS resolve_dfspath_wcard(TALLOC_CTX *ctx,
1663	connection_struct *conn,
1664	bool dfs_pathnames,
1665	const char *name_in,
1666	char **pp_name_out,
1667	bool *ppath_contains_wcard)
1668	{
1669	NTSTATUS status = NT_STATUS_OK;
1670	if (dfs_pathnames) {
1671	status = dfs_redirect(ctx,
1672	conn,
1673	name_in,
1674	True,
1675	pp_name_out,
1676	ppath_contains_wcard);
1677	} else {
1678	/*
1679	* Cheat and just return a copy of the in ptr.
1680	* Once srvstr_get_path() uses talloc it'll
1681	* be a talloced ptr anyway.
1682	*/
1683	pp_name_out = CONST_DISCARD(char ,name_in);
1684	}
1685	return status;
1686	}

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