aboutsummaryrefslogtreecommitdiff
path: root/sys/netsmb/smb_conn.c
blob: 52aeb49ae4d43accf2d16575135e38b3d29d1d68 (plain) (blame)
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
/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2000-2001 Boris Popov
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Connection engine.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/sysctl.h>
#include <sys/socketvar.h>

#include <sys/iconv.h>

#include <netsmb/smb.h>
#include <netsmb/smb_subr.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_tran.h>
#include <netsmb/smb_trantcp.h>

static struct smb_connobj smb_vclist;
static int smb_vcnext = 1;	/* next unique id for VC */

SYSCTL_NODE(_net, OID_AUTO, smb, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
    "SMB protocol");

static MALLOC_DEFINE(M_SMBCONN, "smb_conn", "SMB connection");

static void smb_co_init(struct smb_connobj *cp, int level, char *ilockname,
    char *lockname);
static void smb_co_done(struct smb_connobj *cp);
static int  smb_vc_disconnect(struct smb_vc *vcp);
static void smb_vc_free(struct smb_connobj *cp);
static void smb_vc_gone(struct smb_connobj *cp, struct smb_cred *scred);
static smb_co_free_t smb_share_free;
static smb_co_gone_t smb_share_gone;

static int  smb_sysctl_treedump(SYSCTL_HANDLER_ARGS);

SYSCTL_PROC(_net_smb, OID_AUTO, treedump,
    CTLFLAG_RD | CTLTYPE_OPAQUE | CTLFLAG_MPSAFE,
    NULL, 0, smb_sysctl_treedump, "S,treedump",
    "Requester tree");

int
smb_sm_init(void)
{

	smb_co_init(&smb_vclist, SMBL_SM, "smbsm ilock", "smbsm");
	sx_xlock(&smb_vclist.co_interlock);
	smb_co_unlock(&smb_vclist);
	sx_unlock(&smb_vclist.co_interlock);
	return 0;
}

int
smb_sm_done(void)
{

	/* XXX: hold the mutex */
	if (smb_vclist.co_usecount > 1) {
		SMBERROR("%d connections still active\n", smb_vclist.co_usecount - 1);
		return EBUSY;
	}
	smb_co_done(&smb_vclist);
	return 0;
}

static int
smb_sm_lockvclist(void)
{
	int error;

	sx_xlock(&smb_vclist.co_interlock);
	error = smb_co_lock(&smb_vclist);
	sx_unlock(&smb_vclist.co_interlock);

	return error;
}

static void
smb_sm_unlockvclist(void)
{

	sx_xlock(&smb_vclist.co_interlock);
	smb_co_unlock(&smb_vclist);
	sx_unlock(&smb_vclist.co_interlock);
}

static int
smb_sm_lookupint(struct smb_vcspec *vcspec, struct smb_sharespec *shspec,
	struct smb_cred *scred,	struct smb_vc **vcpp)
{
	struct smb_connobj *scp;
	struct smb_vc *vcp;
	int exact = 1;
	int error;

	vcspec->shspec = shspec;
	error = ENOENT;
	vcp = NULL;
	SMBCO_FOREACH(scp, &smb_vclist) {
		vcp = (struct smb_vc *)scp;
		error = smb_vc_lock(vcp);
		if (error)
			continue;

		if ((vcp->obj.co_flags & SMBV_PRIVATE) ||
		    !CONNADDREQ(vcp->vc_paddr, vcspec->sap) ||
		    strcmp(vcp->vc_username, vcspec->username) != 0)
			goto err1;
		if (vcspec->owner != SMBM_ANY_OWNER) {
			if (vcp->vc_uid != vcspec->owner)
				goto err1;
		} else
			exact = 0;
		if (vcspec->group != SMBM_ANY_GROUP) {
			if (vcp->vc_grp != vcspec->group)
				goto err1;
		} else
			exact = 0;
		if (vcspec->mode & SMBM_EXACT) {
			if (!exact || (vcspec->mode & SMBM_MASK) !=
			    vcp->vc_mode)
				goto err1;
		}
		if (smb_vc_access(vcp, scred, vcspec->mode) != 0)
			goto err1;
		vcspec->ssp = NULL;
		if (shspec) {
			error = (int)smb_vc_lookupshare(vcp, shspec, scred,
			    &vcspec->ssp);
			if (error)
				goto fail;
		}
		error = 0;
		break;
	err1:
		error = 1;
	fail:
		smb_vc_unlock(vcp);
	}
	if (vcp) {
		smb_vc_ref(vcp);
		*vcpp = vcp;
	}
	return (error);
}

int
smb_sm_lookup(struct smb_vcspec *vcspec, struct smb_sharespec *shspec,
	struct smb_cred *scred,	struct smb_vc **vcpp)
{
	struct smb_vc *vcp;
	struct smb_share *ssp = NULL;
	int error;

	*vcpp = vcp = NULL;

	error = smb_sm_lockvclist();
	if (error)
		return error;
	error = smb_sm_lookupint(vcspec, shspec, scred, vcpp);
	if (error == 0 || (vcspec->flags & SMBV_CREATE) == 0) {
		smb_sm_unlockvclist();
		return error;
	}
	error = smb_sm_lookupint(vcspec, NULL, scred, &vcp);
	if (error) {
		error = smb_vc_create(vcspec, scred, &vcp);
		if (error)
			goto out;
		error = smb_vc_connect(vcp, scred);
		if (error)
			goto out;
	}
	if (shspec == NULL)
		goto out;
	error = smb_share_create(vcp, shspec, scred, &ssp);
	if (error)
		goto out;
	error = smb_smb_treeconnect(ssp, scred);
	if (error == 0)
		vcspec->ssp = ssp;
	else
		smb_share_put(ssp, scred);
out:
	smb_sm_unlockvclist();
	if (error == 0)
		*vcpp = vcp;
	else if (vcp) {
		smb_vc_lock(vcp);
		smb_vc_put(vcp, scred);
	}
	return error;
}

/*
 * Common code for connection object
 */
static void
smb_co_init(struct smb_connobj *cp, int level, char *ilockname, char *lockname)
{
	SLIST_INIT(&cp->co_children);
	sx_init_flags(&cp->co_interlock, ilockname, SX_RECURSE);
	cv_init(&cp->co_lock, "smblock");
	cp->co_lockcnt = 0;
	cp->co_locker = NULL;
	cp->co_level = level;
	cp->co_usecount = 1;
	sx_xlock(&cp->co_interlock);
	smb_co_lock(cp);
	sx_unlock(&cp->co_interlock);
}

static void
smb_co_done(struct smb_connobj *cp)
{

	sx_destroy(&cp->co_interlock);
	cv_destroy(&cp->co_lock);
	cp->co_locker = NULL;
	cp->co_flags = 0;
	cp->co_lockcnt = 0;
}

static void
smb_co_gone(struct smb_connobj *cp, struct smb_cred *scred)
{
	struct smb_connobj *parent;

	if (cp->co_gone)
		cp->co_gone(cp, scred);
	parent = cp->co_parent;
	if (parent) {
		sx_xlock(&parent->co_interlock);
		smb_co_lock(parent);
		sx_unlock(&parent->co_interlock);
		SLIST_REMOVE(&parent->co_children, cp, smb_connobj, co_next);
		smb_co_put(parent, scred);
	}
	if (cp->co_free)
		cp->co_free(cp);
}

void
smb_co_ref(struct smb_connobj *cp)
{

	sx_xlock(&cp->co_interlock);
	cp->co_usecount++;
	sx_unlock(&cp->co_interlock);
}

void
smb_co_rele(struct smb_connobj *cp, struct smb_cred *scred)
{

	sx_xlock(&cp->co_interlock);
	smb_co_unlock(cp);
	if (cp->co_usecount > 1) {
		cp->co_usecount--;
		sx_unlock(&cp->co_interlock);
		return;
	}
	if (cp->co_usecount == 0) {
		SMBERROR("negative use_count for object %d", cp->co_level);
		sx_unlock(&cp->co_interlock);
		return;
	}
	cp->co_usecount--;
	cp->co_flags |= SMBO_GONE;
	sx_unlock(&cp->co_interlock);
	smb_co_gone(cp, scred);
}

int
smb_co_get(struct smb_connobj *cp, struct smb_cred *scred)
{
	int error;

	MPASS(sx_xholder(&cp->co_interlock) == curthread);
	cp->co_usecount++;
	error = smb_co_lock(cp);
	if (error) 
		cp->co_usecount--;
	return error;
}

void
smb_co_put(struct smb_connobj *cp, struct smb_cred *scred)
{

	sx_xlock(&cp->co_interlock);
	if (cp->co_usecount > 1) {
		cp->co_usecount--;
	} else if (cp->co_usecount == 1) {
		cp->co_usecount--;
		cp->co_flags |= SMBO_GONE;
	} else {
		SMBERROR("negative usecount");
	}
	smb_co_unlock(cp);
	sx_unlock(&cp->co_interlock);
	if ((cp->co_flags & SMBO_GONE) == 0)
		return;
	smb_co_gone(cp, scred);
}

int
smb_co_lock(struct smb_connobj *cp)
{

	MPASS(sx_xholder(&cp->co_interlock) == curthread); 
	for (;;) {
		if (cp->co_flags & SMBO_GONE)
			return EINVAL;
		if (cp->co_locker == NULL) {
			cp->co_locker = curthread;
			return 0;
		}
		if (cp->co_locker == curthread) {
			cp->co_lockcnt++;
			return 0;
		}
		cv_wait(&cp->co_lock, &cp->co_interlock);
	}
}

void
smb_co_unlock(struct smb_connobj *cp)
{

	MPASS(sx_xholder(&cp->co_interlock) == curthread); 
	MPASS(cp->co_locker == curthread);
	if (cp->co_lockcnt != 0) {
		cp->co_lockcnt--;
		return;
	}
	cp->co_locker = NULL;
	cv_signal(&cp->co_lock);
}

static void
smb_co_addchild(struct smb_connobj *parent, struct smb_connobj *child)
{

	smb_co_ref(parent);
	SLIST_INSERT_HEAD(&parent->co_children, child, co_next);
	child->co_parent = parent;
}

/*
 * Session implementation
 */

int
smb_vc_create(struct smb_vcspec *vcspec,
	struct smb_cred *scred, struct smb_vc **vcpp)
{
	struct smb_vc *vcp;
	struct ucred *cred = scred->scr_cred;
	uid_t uid = vcspec->owner;
	gid_t gid = vcspec->group;
	uid_t realuid = cred->cr_uid;
	char *domain = vcspec->domain;
	int error, isroot;

	isroot = smb_suser(cred) == 0;
	/*
	 * Only superuser can create VCs with different uid and gid
	 */
	if (uid != SMBM_ANY_OWNER && uid != realuid && !isroot)
		return EPERM;
	if (gid != SMBM_ANY_GROUP && !groupmember(gid, cred) && !isroot)
		return EPERM;

	vcp = smb_zmalloc(sizeof(*vcp), M_SMBCONN, M_WAITOK);
	smb_co_init(VCTOCP(vcp), SMBL_VC, "smb_vc ilock", "smb_vc");
	vcp->obj.co_free = smb_vc_free;
	vcp->obj.co_gone = smb_vc_gone;
	vcp->vc_number = smb_vcnext++;
	vcp->vc_timo = SMB_DEFRQTIMO;
	vcp->vc_smbuid = SMB_UID_UNKNOWN;
	vcp->vc_mode = vcspec->rights & SMBM_MASK;
	vcp->obj.co_flags = vcspec->flags & (SMBV_PRIVATE | SMBV_SINGLESHARE);
	vcp->vc_tdesc = &smb_tran_nbtcp_desc;
	vcp->vc_seqno = 0;
	vcp->vc_mackey = NULL;
	vcp->vc_mackeylen = 0;

	if (uid == SMBM_ANY_OWNER)
		uid = realuid;
	if (gid == SMBM_ANY_GROUP)
		gid = cred->cr_groups[0];
	vcp->vc_uid = uid;
	vcp->vc_grp = gid;

	smb_sl_init(&vcp->vc_stlock, "vcstlock");
	error = ENOMEM;

	vcp->vc_paddr = sodupsockaddr(vcspec->sap, M_WAITOK);
	if (vcp->vc_paddr == NULL)
		goto fail;
	vcp->vc_laddr = sodupsockaddr(vcspec->lap, M_WAITOK);
	if (vcp->vc_laddr == NULL)
		goto fail;
	vcp->vc_pass = smb_strdup(vcspec->pass);
	if (vcp->vc_pass == NULL)
		goto fail;
	vcp->vc_domain = smb_strdup((domain && domain[0]) ? domain :
	    "NODOMAIN");
	if (vcp->vc_domain == NULL)
		goto fail;
	vcp->vc_srvname = smb_strdup(vcspec->srvname);
	if (vcp->vc_srvname == NULL)
		goto fail;
	vcp->vc_username = smb_strdup(vcspec->username);
	if (vcp->vc_username == NULL)
		goto fail;
	error = (int)iconv_open("tolower", vcspec->localcs, &vcp->vc_tolower);
	if (error)
		goto fail;
	error = (int)iconv_open("toupper", vcspec->localcs, &vcp->vc_toupper);
	if (error)
		goto fail;
	if (vcspec->servercs[0]) {
		error = (int)iconv_open(vcspec->servercs, vcspec->localcs,
		    &vcp->vc_cp_toserver);
		if (error)
			goto fail;
		error = (int)iconv_open(vcspec->localcs, vcspec->servercs,
		    &vcp->vc_cp_tolocal);
		if (error)
			goto fail;
		vcp->vc_toserver = vcp->vc_cp_toserver;
		vcp->vc_tolocal = vcp->vc_cp_tolocal;
		iconv_add(ENCODING_UNICODE, ENCODING_UNICODE, SMB_UNICODE_NAME);
		iconv_add(ENCODING_UNICODE, SMB_UNICODE_NAME, ENCODING_UNICODE);
		error = (int)iconv_open(SMB_UNICODE_NAME, vcspec->localcs,
		    &vcp->vc_ucs_toserver);
		if (!error) {
			error = (int)iconv_open(vcspec->localcs, SMB_UNICODE_NAME,
			    &vcp->vc_ucs_tolocal);
		}
		if (error) {
			if (vcp->vc_ucs_toserver)
				iconv_close(vcp->vc_ucs_toserver);
			vcp->vc_ucs_toserver = NULL;
			vcp->vc_ucs_tolocal = NULL;
		}
	}
	error = (int)smb_iod_create(vcp);
	if (error)
		goto fail;
	*vcpp = vcp;
	smb_co_addchild(&smb_vclist, VCTOCP(vcp));
	return (0);

 fail:
	smb_vc_put(vcp, scred);
	return (error);
}

static void
smb_vc_free(struct smb_connobj *cp)
{
	struct smb_vc *vcp = CPTOVC(cp);

	if (vcp->vc_iod)
		smb_iod_destroy(vcp->vc_iod);
	SMB_STRFREE(vcp->vc_username);
	SMB_STRFREE(vcp->vc_srvname);
	SMB_STRFREE(vcp->vc_pass);
	SMB_STRFREE(vcp->vc_domain);
	if (vcp->vc_mackey)
		free(vcp->vc_mackey, M_SMBTEMP);
	if (vcp->vc_paddr)
		free(vcp->vc_paddr, M_SONAME);
	if (vcp->vc_laddr)
		free(vcp->vc_laddr, M_SONAME);
	if (vcp->vc_tolower)
		iconv_close(vcp->vc_tolower);
	if (vcp->vc_toupper)
		iconv_close(vcp->vc_toupper);
	if (vcp->vc_tolocal)
		vcp->vc_tolocal = NULL;
	if (vcp->vc_toserver)
		vcp->vc_toserver = NULL;
	if (vcp->vc_cp_tolocal)
		iconv_close(vcp->vc_cp_tolocal);
	if (vcp->vc_cp_toserver)
		iconv_close(vcp->vc_cp_toserver);
	if (vcp->vc_ucs_tolocal)
		iconv_close(vcp->vc_ucs_tolocal);
	if (vcp->vc_ucs_toserver)
		iconv_close(vcp->vc_ucs_toserver);
	smb_co_done(VCTOCP(vcp));
	smb_sl_destroy(&vcp->vc_stlock);
	free(vcp, M_SMBCONN);
}

/*
 * Called when use count of VC dropped to zero.
 */
static void
smb_vc_gone(struct smb_connobj *cp, struct smb_cred *scred)
{
	struct smb_vc *vcp = CPTOVC(cp);

	smb_vc_disconnect(vcp);
}

void
smb_vc_ref(struct smb_vc *vcp)
{
	smb_co_ref(VCTOCP(vcp));
}

void
smb_vc_rele(struct smb_vc *vcp, struct smb_cred *scred)
{
	smb_co_rele(VCTOCP(vcp), scred);
}

int
smb_vc_get(struct smb_vc *vcp, struct smb_cred *scred)
{
	struct smb_connobj *cp;
	int error;

	cp = VCTOCP(vcp);
	sx_xlock(&cp->co_interlock);
	error = smb_co_get(cp, scred);
	sx_unlock(&cp->co_interlock);
	return error;
}

void
smb_vc_put(struct smb_vc *vcp, struct smb_cred *scred)
{
	smb_co_put(VCTOCP(vcp), scred);
}

int
smb_vc_lock(struct smb_vc *vcp)
{
	struct smb_connobj *cp;
	int error;

	cp = VCTOCP(vcp);
	sx_xlock(&cp->co_interlock);
	error = smb_co_lock(cp);
	sx_unlock(&cp->co_interlock);
	return error;
}

void
smb_vc_unlock(struct smb_vc *vcp)
{

	struct smb_connobj *cp;

	cp = VCTOCP(vcp);
	sx_xlock(&cp->co_interlock);
	smb_co_unlock(cp);
	sx_unlock(&cp->co_interlock);
}

int
smb_vc_access(struct smb_vc *vcp, struct smb_cred *scred, mode_t mode)
{
	struct ucred *cred = scred->scr_cred;

	if (smb_suser(cred) == 0 || cred->cr_uid == vcp->vc_uid)
		return 0;
	mode >>= 3;
	if (!groupmember(vcp->vc_grp, cred))
		mode >>= 3;
	return (vcp->vc_mode & mode) == mode ? 0 : EACCES;
}

static int
smb_vc_cmpshare(struct smb_share *ssp, struct smb_sharespec *dp)
{
	int exact = 1;

	if (strcmp(ssp->ss_name, dp->name) != 0)
		return 1;
	if (dp->owner != SMBM_ANY_OWNER) {
		if (ssp->ss_uid != dp->owner)
			return 1;
	} else
		exact = 0;
	if (dp->group != SMBM_ANY_GROUP) {
		if (ssp->ss_grp != dp->group)
			return 1;
	} else
		exact = 0;

	if (dp->mode & SMBM_EXACT) {
		if (!exact)
			return 1;
		return (dp->mode & SMBM_MASK) == ssp->ss_mode ? 0 : 1;
	}
	if (smb_share_access(ssp, dp->scred, dp->mode) != 0)
		return 1;
	return 0;
}

/*
 * Lookup share in the given VC. Share referenced and locked on return.
 * VC expected to be locked on entry and will be left locked on exit.
 */
int
smb_vc_lookupshare(struct smb_vc *vcp, struct smb_sharespec *dp,
	struct smb_cred *scred,	struct smb_share **sspp)
{
	struct smb_connobj *scp = NULL;
	struct smb_share *ssp = NULL;
	int error;

	*sspp = NULL;
	dp->scred = scred;
	SMBCO_FOREACH(scp, VCTOCP(vcp)) {
		ssp = (struct smb_share *)scp;
		error = smb_share_lock(ssp);
		if (error)
			continue;
		if (smb_vc_cmpshare(ssp, dp) == 0)
			break;
		smb_share_unlock(ssp);
	}
	if (ssp) {
		smb_share_ref(ssp);
		*sspp = ssp;
		error = 0;
	} else
		error = ENOENT;
	return error;
}

int
smb_vc_connect(struct smb_vc *vcp, struct smb_cred *scred)
{

	return smb_iod_request(vcp->vc_iod, SMBIOD_EV_CONNECT | SMBIOD_EV_SYNC, NULL);
}

/*
 * Destroy VC to server, invalidate shares linked with it.
 * Transport should be locked on entry.
 */
int
smb_vc_disconnect(struct smb_vc *vcp)
{

	if (vcp->vc_iod != NULL)
		smb_iod_request(vcp->vc_iod, SMBIOD_EV_DISCONNECT |
		    SMBIOD_EV_SYNC, NULL);
	return 0;
}

static char smb_emptypass[] = "";

const char *
smb_vc_getpass(struct smb_vc *vcp)
{
	if (vcp->vc_pass)
		return vcp->vc_pass;
	return smb_emptypass;
}

static int
smb_vc_getinfo(struct smb_vc *vcp, struct smb_vc_info *vip)
{
	bzero(vip, sizeof(struct smb_vc_info));
	vip->itype = SMB_INFO_VC;
	vip->usecount = vcp->obj.co_usecount;
	vip->uid = vcp->vc_uid;
	vip->gid = vcp->vc_grp;
	vip->mode = vcp->vc_mode;
	vip->flags = vcp->obj.co_flags;
	vip->sopt = vcp->vc_sopt;
	vip->iodstate = vcp->vc_iod->iod_state;
	bzero(&vip->sopt.sv_skey, sizeof(vip->sopt.sv_skey));
	snprintf(vip->srvname, sizeof(vip->srvname), "%s", vcp->vc_srvname);
	snprintf(vip->vcname, sizeof(vip->vcname), "%s", vcp->vc_username);
	return 0;
}

u_short
smb_vc_nextmid(struct smb_vc *vcp)
{
	u_short r;
	
	sx_xlock(&vcp->obj.co_interlock);
	r = vcp->vc_mid++;
	sx_unlock(&vcp->obj.co_interlock);
	return r;
}

/*
 * Share implementation
 */
/*
 * Allocate share structure and attach it to the given VC
 * Connection expected to be locked on entry. Share will be returned
 * in locked state.
 */
int
smb_share_create(struct smb_vc *vcp, struct smb_sharespec *shspec,
	struct smb_cred *scred, struct smb_share **sspp)
{
	struct smb_share *ssp;
	struct ucred *cred = scred->scr_cred;
	uid_t realuid = cred->cr_uid;
	uid_t uid = shspec->owner;
	gid_t gid = shspec->group;
	int error, isroot;

	isroot = smb_suser(cred) == 0;
	/*
	 * Only superuser can create shares with different uid and gid
	 */
	if (uid != SMBM_ANY_OWNER && uid != realuid && !isroot)
		return EPERM;
	if (gid != SMBM_ANY_GROUP && !groupmember(gid, cred) && !isroot)
		return EPERM;
	error = smb_vc_lookupshare(vcp, shspec, scred, &ssp);
	if (!error) {
		smb_share_put(ssp, scred);
		return EEXIST;
	}
	if (uid == SMBM_ANY_OWNER)
		uid = realuid;
	if (gid == SMBM_ANY_GROUP)
		gid = cred->cr_groups[0];
	ssp = smb_zmalloc(sizeof(*ssp), M_SMBCONN, M_WAITOK);
	smb_co_init(SSTOCP(ssp), SMBL_SHARE, "smbss ilock", "smbss");
	ssp->obj.co_free = smb_share_free;
	ssp->obj.co_gone = smb_share_gone;
	smb_sl_init(&ssp->ss_stlock, "ssstlock");
	ssp->ss_name = smb_strdup(shspec->name);
	if (shspec->pass && shspec->pass[0])
		ssp->ss_pass = smb_strdup(shspec->pass);
	ssp->ss_type = shspec->stype;
	ssp->ss_tid = SMB_TID_UNKNOWN;
	ssp->ss_uid = uid;
	ssp->ss_grp = gid;
	ssp->ss_mode = shspec->rights & SMBM_MASK;
	smb_co_addchild(VCTOCP(vcp), SSTOCP(ssp));
	*sspp = ssp;
	return 0;
}

static void
smb_share_free(struct smb_connobj *cp)
{
	struct smb_share *ssp = CPTOSS(cp);

	SMB_STRFREE(ssp->ss_name);
	SMB_STRFREE(ssp->ss_pass);
	smb_sl_destroy(&ssp->ss_stlock);
	smb_co_done(SSTOCP(ssp));
	free(ssp, M_SMBCONN);
}

static void
smb_share_gone(struct smb_connobj *cp, struct smb_cred *scred)
{
	struct smb_share *ssp = CPTOSS(cp);

	smb_smb_treedisconnect(ssp, scred);
}

void
smb_share_ref(struct smb_share *ssp)
{
	smb_co_ref(SSTOCP(ssp));
}

void
smb_share_rele(struct smb_share *ssp, struct smb_cred *scred)
{
	smb_co_rele(SSTOCP(ssp), scred);
}

int
smb_share_get(struct smb_share *ssp, struct smb_cred *scred)
{
	struct smb_connobj *cp = SSTOCP(ssp);
	int error;

	sx_xlock(&cp->co_interlock);
	error = smb_co_get(cp, scred);
	sx_unlock(&cp->co_interlock);
	return error;
}

void
smb_share_put(struct smb_share *ssp, struct smb_cred *scred)
{
	
	smb_co_put(SSTOCP(ssp), scred);
}

int
smb_share_lock(struct smb_share *ssp)
{
	struct smb_connobj *cp;
	int error;
	
	cp = SSTOCP(ssp);
	sx_xlock(&cp->co_interlock);
	error = smb_co_lock(cp);
	sx_unlock(&cp->co_interlock);
	return error;
}

void
smb_share_unlock(struct smb_share *ssp)
{
	struct smb_connobj *cp;
	
	cp = SSTOCP(ssp);
	sx_xlock(&cp->co_interlock);
	smb_co_unlock(cp);
	sx_unlock(&cp->co_interlock);
}

int
smb_share_access(struct smb_share *ssp, struct smb_cred *scred, mode_t mode)
{
	struct ucred *cred = scred->scr_cred;

	if (smb_suser(cred) == 0 || cred->cr_uid == ssp->ss_uid)
		return 0;
	mode >>= 3;
	if (!groupmember(ssp->ss_grp, cred))
		mode >>= 3;
	return (ssp->ss_mode & mode) == mode ? 0 : EACCES;
}

void
smb_share_invalidate(struct smb_share *ssp)
{
	ssp->ss_tid = SMB_TID_UNKNOWN;
}

int
smb_share_valid(struct smb_share *ssp)
{
	return ssp->ss_tid != SMB_TID_UNKNOWN &&
	    ssp->ss_vcgenid == SSTOVC(ssp)->vc_genid;
}

const char*
smb_share_getpass(struct smb_share *ssp)
{
	struct smb_vc *vcp;

	if (ssp->ss_pass)
		return ssp->ss_pass;
	vcp = SSTOVC(ssp);
	if (vcp->vc_pass)
		return vcp->vc_pass;
	return smb_emptypass;
}

static int
smb_share_getinfo(struct smb_share *ssp, struct smb_share_info *sip)
{
	bzero(sip, sizeof(struct smb_share_info));
	sip->itype = SMB_INFO_SHARE;
	sip->usecount = ssp->obj.co_usecount;
	sip->tid  = ssp->ss_tid;
	sip->type= ssp->ss_type;
	sip->uid = ssp->ss_uid;
	sip->gid = ssp->ss_grp;
	sip->mode= ssp->ss_mode;
	sip->flags = ssp->obj.co_flags;
	snprintf(sip->sname, sizeof(sip->sname), "%s", ssp->ss_name);
	return 0;
}

/*
 * Dump an entire tree into sysctl call
 */
static int
smb_sysctl_treedump(SYSCTL_HANDLER_ARGS)
{
	struct smb_connobj *scp1, *scp2;
	struct smb_vc *vcp;
	struct smb_share *ssp;
	struct smb_vc_info vci;
	struct smb_share_info ssi;
	int error, itype;

	error = sysctl_wire_old_buffer(req, 0);
	if (error)
		return (error);
	error = smb_sm_lockvclist();
	if (error)
		return error;
	SMBCO_FOREACH(scp1, &smb_vclist) {
		vcp = (struct smb_vc *)scp1;
		error = smb_vc_lock(vcp);
		if (error)
			continue;
		smb_vc_getinfo(vcp, &vci);
		error = SYSCTL_OUT(req, &vci, sizeof(struct smb_vc_info));
		if (error) {
			smb_vc_unlock(vcp);
			break;
		}
		SMBCO_FOREACH(scp2, VCTOCP(vcp)) {
			ssp = (struct smb_share *)scp2;
			error = smb_share_lock(ssp);
			if (error) {
				error = 0;
				continue;
			}
			smb_share_getinfo(ssp, &ssi);
			smb_share_unlock(ssp);
			error = SYSCTL_OUT(req, &ssi, sizeof(struct smb_share_info));
			if (error)
				break;
		}
		smb_vc_unlock(vcp);
		if (error)
			break;
	}
	if (!error) {
		itype = SMB_INFO_NONE;
		error = SYSCTL_OUT(req, &itype, sizeof(itype));
	}
	smb_sm_unlockvclist();
	return error;
}