1 /* backover.c - backend overlay routines */
2 /* $OpenLDAP$ */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 *
5 * Copyright 2003-2021 The OpenLDAP Foundation.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
10 * Public License.
11 *
12 * A copy of this license is available in the file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
15 */
16
17 /* Functions to overlay other modules over a backend. */
18
19 #include "portable.h"
20
21 #include <stdio.h>
22
23 #include <ac/string.h>
24 #include <ac/socket.h>
25
26 #define SLAPD_TOOLS
27 #include "slap.h"
28 #include "slap-config.h"
29
30 static slap_overinst *overlays;
31
32 static int
over_db_config(BackendDB * be,const char * fname,int lineno,int argc,char ** argv)33 over_db_config(
34 BackendDB *be,
35 const char *fname,
36 int lineno,
37 int argc,
38 char **argv
39 )
40 {
41 slap_overinfo *oi = be->bd_info->bi_private;
42 slap_overinst *on = oi->oi_list;
43 BackendInfo *bi_orig = be->bd_info;
44 struct ConfigOCs *be_cf_ocs = be->be_cf_ocs;
45 ConfigArgs ca = {0};
46 int rc = 0;
47
48 if ( oi->oi_orig->bi_db_config ) {
49 be->bd_info = oi->oi_orig;
50 be->be_cf_ocs = oi->oi_orig->bi_cf_ocs;
51 rc = oi->oi_orig->bi_db_config( be, fname, lineno,
52 argc, argv );
53
54 if ( be->bd_info != oi->oi_orig ) {
55 slap_overinfo *oi2;
56 slap_overinst *on2, **onp;
57 BackendDB be2 = *be;
58 int i;
59
60 /* a database added an overlay;
61 * work it around... */
62 assert( overlay_is_over( be ) );
63
64 oi2 = ( slap_overinfo * )be->bd_info->bi_private;
65 on2 = oi2->oi_list;
66
67 /* need to put a uniqueness check here as well;
68 * note that in principle there could be more than
69 * one overlay as a result of multiple calls to
70 * overlay_config() */
71 be2.bd_info = (BackendInfo *)oi;
72
73 for ( i = 0, onp = &on2; *onp; i++, onp = &(*onp)->on_next ) {
74 if ( overlay_is_inst( &be2, (*onp)->on_bi.bi_type ) ) {
75 Debug( LDAP_DEBUG_ANY, "over_db_config(): "
76 "warning, freshly added "
77 "overlay #%d \"%s\" is already in list\n",
78 i, (*onp)->on_bi.bi_type );
79
80 /* NOTE: if the overlay already exists,
81 * there is no way to merge the results
82 * of the configuration that may have
83 * occurred during bi_db_config(); we
84 * just issue a warning, and the
85 * administrator should deal with this */
86 }
87 }
88 *onp = oi->oi_list;
89
90 oi->oi_list = on2;
91
92 ch_free( be->bd_info );
93 }
94
95 be->bd_info = (BackendInfo *)oi;
96 if ( rc != SLAP_CONF_UNKNOWN ) return rc;
97 }
98
99 ca.argv = argv;
100 ca.argc = argc;
101 ca.fname = fname;
102 ca.lineno = lineno;
103 ca.be = be;
104 snprintf( ca.log, sizeof( ca.log ), "%s: line %d",
105 ca.fname, ca.lineno );
106 ca.op = SLAP_CONFIG_ADD;
107 ca.valx = -1;
108
109 for (; on; on=on->on_next) {
110 rc = SLAP_CONF_UNKNOWN;
111 if (on->on_bi.bi_cf_ocs) {
112 ConfigTable *ct;
113 ca.bi = &on->on_bi;
114 ct = config_find_keyword( on->on_bi.bi_cf_ocs->co_table, &ca );
115 if ( ct ) {
116 ca.table = on->on_bi.bi_cf_ocs->co_type;
117 rc = config_add_vals( ct, &ca );
118 if ( rc != SLAP_CONF_UNKNOWN )
119 break;
120 }
121 }
122 if (on->on_bi.bi_db_config && rc == SLAP_CONF_UNKNOWN) {
123 be->bd_info = &on->on_bi;
124 rc = on->on_bi.bi_db_config( be, fname, lineno,
125 argc, argv );
126 if ( rc != SLAP_CONF_UNKNOWN ) break;
127 }
128 }
129 be->bd_info = bi_orig;
130 be->be_cf_ocs = be_cf_ocs;
131
132 return rc;
133 }
134
135 static int
over_db_open(BackendDB * be,ConfigReply * cr)136 over_db_open(
137 BackendDB *be,
138 ConfigReply *cr
139 )
140 {
141 slap_overinfo *oi = be->bd_info->bi_private;
142 slap_overinst *on = oi->oi_list;
143 BackendDB db = *be;
144 int rc = 0;
145
146 db.be_flags |= SLAP_DBFLAG_OVERLAY;
147 db.bd_info = oi->oi_orig;
148 if ( db.bd_info->bi_db_open ) {
149 rc = db.bd_info->bi_db_open( &db, cr );
150 }
151
152 for (; on && rc == 0; on=on->on_next) {
153 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
154 continue;
155 db.bd_info = &on->on_bi;
156 if ( db.bd_info->bi_db_open ) {
157 rc = db.bd_info->bi_db_open( &db, cr );
158 }
159 }
160
161 return rc;
162 }
163
164 static int
over_db_close(BackendDB * be,ConfigReply * cr)165 over_db_close(
166 BackendDB *be,
167 ConfigReply *cr
168 )
169 {
170 slap_overinfo *oi = be->bd_info->bi_private;
171 slap_overinst *on = oi->oi_list;
172 BackendInfo *bi_orig = be->bd_info;
173 int rc = 0;
174
175 for (; on && rc == 0; on=on->on_next) {
176 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
177 continue;
178 be->bd_info = &on->on_bi;
179 if ( be->bd_info->bi_db_close ) {
180 rc = be->bd_info->bi_db_close( be, cr );
181 }
182 }
183
184 if ( oi->oi_orig->bi_db_close ) {
185 be->bd_info = oi->oi_orig;
186 rc = be->bd_info->bi_db_close( be, cr );
187 }
188
189 be->bd_info = bi_orig;
190 return rc;
191 }
192
193 static int
over_db_destroy(BackendDB * be,ConfigReply * cr)194 over_db_destroy(
195 BackendDB *be,
196 ConfigReply *cr
197 )
198 {
199 slap_overinfo *oi = be->bd_info->bi_private;
200 slap_overinst *on = oi->oi_list, *next;
201 BackendInfo *bi_orig = be->bd_info;
202 int rc = 0;
203
204 be->bd_info = oi->oi_orig;
205 if ( be->bd_info->bi_db_destroy ) {
206 rc = be->bd_info->bi_db_destroy( be, cr );
207 }
208
209 for (; on && rc == 0; on=on->on_next) {
210 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
211 continue;
212 be->bd_info = &on->on_bi;
213 if ( be->bd_info->bi_db_destroy ) {
214 rc = be->bd_info->bi_db_destroy( be, cr );
215 }
216 }
217
218 on = oi->oi_list;
219 if ( on ) {
220 for (next = on->on_next; on; on=next) {
221 next = on->on_next;
222 free( on );
223 }
224 }
225 be->bd_info = bi_orig;
226 free( oi );
227 return rc;
228 }
229
230 static int
over_back_response(Operation * op,SlapReply * rs)231 over_back_response ( Operation *op, SlapReply *rs )
232 {
233 slap_overinfo *oi = op->o_callback->sc_private;
234 slap_overinst *on = oi->oi_list;
235 int rc = SLAP_CB_CONTINUE;
236 BackendDB *be = op->o_bd, db = *op->o_bd;
237
238 db.be_flags |= SLAP_DBFLAG_OVERLAY;
239 op->o_bd = &db;
240 for (; on; on=on->on_next ) {
241 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
242 continue;
243 if ( on->on_response ) {
244 db.bd_info = (BackendInfo *)on;
245 rc = on->on_response( op, rs );
246 if ( rc != SLAP_CB_CONTINUE ) break;
247 }
248 }
249 /* Bypass the remaining on_response layers, but allow
250 * normal execution to continue.
251 */
252 if ( rc == SLAP_CB_BYPASS )
253 rc = SLAP_CB_CONTINUE;
254 op->o_bd = be;
255 return rc;
256 }
257
258 static int
over_access_allowed(Operation * op,Entry * e,AttributeDescription * desc,struct berval * val,slap_access_t access,AccessControlState * state,slap_mask_t * maskp)259 over_access_allowed(
260 Operation *op,
261 Entry *e,
262 AttributeDescription *desc,
263 struct berval *val,
264 slap_access_t access,
265 AccessControlState *state,
266 slap_mask_t *maskp )
267 {
268 slap_overinfo *oi;
269 slap_overinst *on;
270 BackendInfo *bi;
271 BackendDB *be = op->o_bd, db;
272 int rc = SLAP_CB_CONTINUE;
273
274 /* FIXME: used to happen for instance during abandon
275 * when global overlays are used... */
276 assert( op->o_bd != NULL );
277
278 bi = op->o_bd->bd_info;
279 /* Were we invoked on the frontend? */
280 if ( !bi->bi_access_allowed ) {
281 oi = frontendDB->bd_info->bi_private;
282 } else {
283 oi = op->o_bd->bd_info->bi_private;
284 }
285 on = oi->oi_list;
286
287 for ( ; on; on = on->on_next ) {
288 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
289 continue;
290 if ( on->on_bi.bi_access_allowed ) {
291 /* NOTE: do not copy the structure until required */
292 if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
293 db = *op->o_bd;
294 db.be_flags |= SLAP_DBFLAG_OVERLAY;
295 op->o_bd = &db;
296 }
297
298 op->o_bd->bd_info = (BackendInfo *)on;
299 rc = on->on_bi.bi_access_allowed( op, e,
300 desc, val, access, state, maskp );
301 if ( rc != SLAP_CB_CONTINUE ) break;
302 }
303 }
304
305 if ( rc == SLAP_CB_CONTINUE ) {
306 BI_access_allowed *bi_access_allowed;
307
308 /* if the database structure was changed, o_bd points to a
309 * copy of the structure; put the original bd_info in place */
310 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
311 op->o_bd->bd_info = oi->oi_orig;
312 }
313
314 if ( oi->oi_orig->bi_access_allowed ) {
315 bi_access_allowed = oi->oi_orig->bi_access_allowed;
316 } else {
317 bi_access_allowed = slap_access_allowed;
318 }
319
320 rc = bi_access_allowed( op, e,
321 desc, val, access, state, maskp );
322 }
323 /* should not fall thru this far without anything happening... */
324 if ( rc == SLAP_CB_CONTINUE ) {
325 /* access not allowed */
326 rc = 0;
327 }
328
329 op->o_bd = be;
330 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
331 op->o_bd->bd_info = bi;
332 }
333
334 return rc;
335 }
336
337 int
overlay_entry_get_ov(Operation * op,struct berval * dn,ObjectClass * oc,AttributeDescription * ad,int rw,Entry ** e,slap_overinst * on)338 overlay_entry_get_ov(
339 Operation *op,
340 struct berval *dn,
341 ObjectClass *oc,
342 AttributeDescription *ad,
343 int rw,
344 Entry **e,
345 slap_overinst *on )
346 {
347 slap_overinfo *oi = on->on_info;
348 BackendDB *be = op->o_bd, db;
349 BackendInfo *bi = op->o_bd->bd_info;
350 int rc = SLAP_CB_CONTINUE;
351
352 for ( ; on; on = on->on_next ) {
353 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
354 continue;
355 if ( on->on_bi.bi_entry_get_rw ) {
356 /* NOTE: do not copy the structure until required */
357 if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
358 db = *op->o_bd;
359 db.be_flags |= SLAP_DBFLAG_OVERLAY;
360 op->o_bd = &db;
361 }
362
363 op->o_bd->bd_info = (BackendInfo *)on;
364 rc = on->on_bi.bi_entry_get_rw( op, dn,
365 oc, ad, rw, e );
366 if ( rc != SLAP_CB_CONTINUE ) break;
367 }
368 }
369
370 if ( rc == SLAP_CB_CONTINUE ) {
371 /* if the database structure was changed, o_bd points to a
372 * copy of the structure; put the original bd_info in place */
373 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
374 op->o_bd->bd_info = oi->oi_orig;
375 }
376
377 if ( oi->oi_orig->bi_entry_get_rw ) {
378 rc = oi->oi_orig->bi_entry_get_rw( op, dn,
379 oc, ad, rw, e );
380 }
381 }
382 /* should not fall thru this far without anything happening... */
383 if ( rc == SLAP_CB_CONTINUE ) {
384 rc = LDAP_UNWILLING_TO_PERFORM;
385 }
386
387 op->o_bd = be;
388 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
389 op->o_bd->bd_info = bi;
390 }
391
392 return rc;
393 }
394
395 static int
over_entry_get_rw(Operation * op,struct berval * dn,ObjectClass * oc,AttributeDescription * ad,int rw,Entry ** e)396 over_entry_get_rw(
397 Operation *op,
398 struct berval *dn,
399 ObjectClass *oc,
400 AttributeDescription *ad,
401 int rw,
402 Entry **e )
403 {
404 slap_overinfo *oi;
405 slap_overinst *on;
406
407 assert( op->o_bd != NULL );
408
409 oi = op->o_bd->bd_info->bi_private;
410 on = oi->oi_list;
411
412 return overlay_entry_get_ov( op, dn, oc, ad, rw, e, on );
413 }
414
415 int
overlay_entry_release_ov(Operation * op,Entry * e,int rw,slap_overinst * on)416 overlay_entry_release_ov(
417 Operation *op,
418 Entry *e,
419 int rw,
420 slap_overinst *on )
421 {
422 slap_overinfo *oi = on->on_info;
423 BackendDB *be = op->o_bd, db;
424 BackendInfo *bi = op->o_bd->bd_info;
425 int rc = SLAP_CB_CONTINUE;
426
427 for ( ; on; on = on->on_next ) {
428 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
429 continue;
430 if ( on->on_bi.bi_entry_release_rw ) {
431 /* NOTE: do not copy the structure until required */
432 if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
433 db = *op->o_bd;
434 db.be_flags |= SLAP_DBFLAG_OVERLAY;
435 op->o_bd = &db;
436 }
437
438 op->o_bd->bd_info = (BackendInfo *)on;
439 rc = on->on_bi.bi_entry_release_rw( op, e, rw );
440 if ( rc != SLAP_CB_CONTINUE ) break;
441 }
442 }
443
444 if ( rc == SLAP_CB_CONTINUE ) {
445 /* if the database structure was changed, o_bd points to a
446 * copy of the structure; put the original bd_info in place */
447 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
448 op->o_bd->bd_info = oi->oi_orig;
449 }
450
451 if ( oi->oi_orig->bi_entry_release_rw ) {
452 rc = oi->oi_orig->bi_entry_release_rw( op, e, rw );
453 }
454 }
455 /* should not fall thru this far without anything happening... */
456 if ( rc == SLAP_CB_CONTINUE ) {
457 entry_free( e );
458 rc = 0;
459 }
460
461 op->o_bd = be;
462 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
463 op->o_bd->bd_info = bi;
464 }
465
466 return rc;
467 }
468
469 static int
over_entry_release_rw(Operation * op,Entry * e,int rw)470 over_entry_release_rw(
471 Operation *op,
472 Entry *e,
473 int rw )
474 {
475 slap_overinfo *oi;
476 slap_overinst *on;
477
478 assert( op->o_bd != NULL );
479
480 oi = op->o_bd->bd_info->bi_private;
481 on = oi->oi_list;
482
483 return overlay_entry_release_ov( op, e, rw, on );
484 }
485
486 static int
over_acl_group(Operation * op,Entry * e,struct berval * gr_ndn,struct berval * op_ndn,ObjectClass * group_oc,AttributeDescription * group_at)487 over_acl_group(
488 Operation *op,
489 Entry *e,
490 struct berval *gr_ndn,
491 struct berval *op_ndn,
492 ObjectClass *group_oc,
493 AttributeDescription *group_at )
494 {
495 slap_overinfo *oi;
496 slap_overinst *on;
497 BackendInfo *bi;
498 BackendDB *be = op->o_bd, db;
499 int rc = SLAP_CB_CONTINUE;
500
501 /* FIXME: used to happen for instance during abandon
502 * when global overlays are used... */
503 assert( be != NULL );
504
505 bi = be->bd_info;
506 oi = bi->bi_private;
507 on = oi->oi_list;
508
509 for ( ; on; on = on->on_next ) {
510 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
511 continue;
512 if ( on->on_bi.bi_acl_group ) {
513 /* NOTE: do not copy the structure until required */
514 if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
515 db = *op->o_bd;
516 db.be_flags |= SLAP_DBFLAG_OVERLAY;
517 op->o_bd = &db;
518 }
519
520 op->o_bd->bd_info = (BackendInfo *)on;
521 rc = on->on_bi.bi_acl_group( op, e,
522 gr_ndn, op_ndn, group_oc, group_at );
523 if ( rc != SLAP_CB_CONTINUE ) break;
524 }
525 }
526
527 if ( rc == SLAP_CB_CONTINUE ) {
528 BI_acl_group *bi_acl_group;
529
530 /* if the database structure was changed, o_bd points to a
531 * copy of the structure; put the original bd_info in place */
532 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
533 op->o_bd->bd_info = oi->oi_orig;
534 }
535
536 if ( oi->oi_orig->bi_acl_group ) {
537 bi_acl_group = oi->oi_orig->bi_acl_group;
538 } else {
539 bi_acl_group = backend_group;
540 }
541
542 rc = bi_acl_group( op, e,
543 gr_ndn, op_ndn, group_oc, group_at );
544 }
545 /* should not fall thru this far without anything happening... */
546 if ( rc == SLAP_CB_CONTINUE ) {
547 /* access not allowed */
548 rc = 0;
549 }
550
551 op->o_bd = be;
552 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
553 op->o_bd->bd_info = bi;
554 }
555
556 return rc;
557 }
558
559 static int
over_acl_attribute(Operation * op,Entry * target,struct berval * entry_ndn,AttributeDescription * entry_at,BerVarray * vals,slap_access_t access)560 over_acl_attribute(
561 Operation *op,
562 Entry *target,
563 struct berval *entry_ndn,
564 AttributeDescription *entry_at,
565 BerVarray *vals,
566 slap_access_t access )
567 {
568 slap_overinfo *oi;
569 slap_overinst *on;
570 BackendInfo *bi;
571 BackendDB *be = op->o_bd, db;
572 int rc = SLAP_CB_CONTINUE;
573
574 /* FIXME: used to happen for instance during abandon
575 * when global overlays are used... */
576 assert( be != NULL );
577
578 bi = be->bd_info;
579 oi = bi->bi_private;
580 on = oi->oi_list;
581
582 for ( ; on; on = on->on_next ) {
583 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
584 continue;
585 if ( on->on_bi.bi_acl_attribute ) {
586 /* NOTE: do not copy the structure until required */
587 if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
588 db = *op->o_bd;
589 db.be_flags |= SLAP_DBFLAG_OVERLAY;
590 op->o_bd = &db;
591 }
592
593 op->o_bd->bd_info = (BackendInfo *)on;
594 rc = on->on_bi.bi_acl_attribute( op, target,
595 entry_ndn, entry_at, vals, access );
596 if ( rc != SLAP_CB_CONTINUE ) break;
597 }
598 }
599
600 if ( rc == SLAP_CB_CONTINUE ) {
601 BI_acl_attribute *bi_acl_attribute;
602
603 /* if the database structure was changed, o_bd points to a
604 * copy of the structure; put the original bd_info in place */
605 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
606 op->o_bd->bd_info = oi->oi_orig;
607 }
608
609 if ( oi->oi_orig->bi_acl_attribute ) {
610 bi_acl_attribute = oi->oi_orig->bi_acl_attribute;
611 } else {
612 bi_acl_attribute = backend_attribute;
613 }
614
615 rc = bi_acl_attribute( op, target,
616 entry_ndn, entry_at, vals, access );
617 }
618 /* should not fall thru this far without anything happening... */
619 if ( rc == SLAP_CB_CONTINUE ) {
620 /* access not allowed */
621 rc = 0;
622 }
623
624 op->o_bd = be;
625 if ( SLAP_ISOVERLAY( op->o_bd ) ) {
626 op->o_bd->bd_info = bi;
627 }
628
629 return rc;
630 }
631
632 int
overlay_callback_after_backover(Operation * op,slap_callback * sc,int append)633 overlay_callback_after_backover( Operation *op, slap_callback *sc, int append )
634 {
635 slap_callback **scp;
636
637 for ( scp = &op->o_callback; *scp != NULL; scp = &(*scp)->sc_next ) {
638 if ( (*scp)->sc_response == over_back_response ) {
639 sc->sc_next = (*scp)->sc_next;
640 (*scp)->sc_next = sc;
641 return 0;
642 }
643 }
644
645 if ( append ) {
646 *scp = sc;
647 return 0;
648 }
649
650 return 1;
651 }
652
653 /*
654 * default return code in case of missing backend function
655 * and overlay stack returning SLAP_CB_CONTINUE
656 */
657 static int op_rc[ op_last ] = {
658 LDAP_UNWILLING_TO_PERFORM, /* bind */
659 LDAP_UNWILLING_TO_PERFORM, /* unbind */
660 LDAP_UNWILLING_TO_PERFORM, /* search */
661 SLAP_CB_CONTINUE, /* compare; pass to frontend */
662 LDAP_UNWILLING_TO_PERFORM, /* modify */
663 LDAP_UNWILLING_TO_PERFORM, /* modrdn */
664 LDAP_UNWILLING_TO_PERFORM, /* add */
665 LDAP_UNWILLING_TO_PERFORM, /* delete */
666 LDAP_UNWILLING_TO_PERFORM, /* abandon */
667 LDAP_UNWILLING_TO_PERFORM, /* cancel */
668 LDAP_UNWILLING_TO_PERFORM, /* extended */
669 LDAP_SUCCESS, /* aux_operational */
670 LDAP_SUCCESS, /* aux_chk_referrals */
671 SLAP_CB_CONTINUE /* aux_chk_controls; pass to frontend */
672 };
673
overlay_op_walk(Operation * op,SlapReply * rs,slap_operation_t which,slap_overinfo * oi,slap_overinst * on)674 int overlay_op_walk(
675 Operation *op,
676 SlapReply *rs,
677 slap_operation_t which,
678 slap_overinfo *oi,
679 slap_overinst *on
680 )
681 {
682 BackendInfo *bi;
683 int rc = SLAP_CB_CONTINUE;
684
685 for (; on; on=on->on_next ) {
686 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
687 continue;
688 bi = &on->on_bi;
689 if ( (&bi->bi_op_bind)[ which ] ) {
690 op->o_bd->bd_info = (BackendInfo *)on;
691 rc = (&bi->bi_op_bind)[ which ]( op, rs );
692 if ( rc != SLAP_CB_CONTINUE ) break;
693 }
694 }
695 if ( rc == SLAP_CB_BYPASS )
696 rc = SLAP_CB_CONTINUE;
697 /* if an overlay halted processing, make sure
698 * any previously set cleanup handlers are run
699 */
700 if ( rc != SLAP_CB_CONTINUE )
701 goto cleanup;
702
703 bi = oi->oi_orig;
704 if ( (&bi->bi_op_bind)[ which ] ) {
705 op->o_bd->bd_info = bi;
706 rc = (&bi->bi_op_bind)[ which ]( op, rs );
707 }
708 /* should not fall thru this far without anything happening... */
709 if ( rc == SLAP_CB_CONTINUE ) {
710 rc = op_rc[ which ];
711 }
712
713 /* The underlying backend didn't handle the request, make sure
714 * overlay cleanup is processed.
715 */
716 if ( rc == LDAP_UNWILLING_TO_PERFORM ) {
717 slap_callback *sc_next;
718 cleanup:
719 for ( ; op->o_callback && op->o_callback->sc_response !=
720 over_back_response; op->o_callback = sc_next ) {
721 sc_next = op->o_callback->sc_next;
722 if ( op->o_callback->sc_cleanup ) {
723 op->o_callback->sc_cleanup( op, rs );
724 }
725 }
726 }
727 return rc;
728 }
729
730 static int
over_op_func(Operation * op,SlapReply * rs,slap_operation_t which)731 over_op_func(
732 Operation *op,
733 SlapReply *rs,
734 slap_operation_t which
735 )
736 {
737 slap_overinfo *oi;
738 slap_overinst *on;
739 BackendDB *be = op->o_bd, db;
740 slap_callback **sc;
741 slap_callback *cb;
742 int rc = SLAP_CB_CONTINUE;
743
744 /* FIXME: used to happen for instance during abandon
745 * when global overlays are used... */
746 assert( op->o_bd != NULL );
747
748 oi = op->o_bd->bd_info->bi_private;
749 on = oi->oi_list;
750
751 if ( !SLAP_ISOVERLAY( op->o_bd )) {
752 db = *op->o_bd;
753 db.be_flags |= SLAP_DBFLAG_OVERLAY;
754 op->o_bd = &db;
755 }
756 if ( op->o_tag != LDAP_REQ_ABANDON && op->o_tag != LDAP_REQ_UNBIND ) {
757 cb = (slap_callback *)op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
758 cb->sc_cleanup = NULL;
759 cb->sc_response = over_back_response;
760 cb->sc_writewait = NULL;
761 cb->sc_next = op->o_callback;
762 cb->sc_private = oi;
763 op->o_callback = cb;
764 }
765
766 rc = overlay_op_walk( op, rs, which, oi, on );
767 if ( rc != SLAPD_ASYNCOP && op->o_tag != LDAP_REQ_ABANDON && op->o_tag != LDAP_REQ_UNBIND ) {
768 for ( sc = &op->o_callback; *sc; sc = &(*sc)->sc_next ) {
769 if ( *sc == cb ) {
770 *sc = cb->sc_next;
771 op->o_tmpfree( cb, op->o_tmpmemctx );
772 break;
773 }
774 }
775 }
776
777 op->o_bd = be;
778 return rc;
779 }
780
781 static int
over_op_bind(Operation * op,SlapReply * rs)782 over_op_bind( Operation *op, SlapReply *rs )
783 {
784 return over_op_func( op, rs, op_bind );
785 }
786
787 static int
over_op_unbind(Operation * op,SlapReply * rs)788 over_op_unbind( Operation *op, SlapReply *rs )
789 {
790 return over_op_func( op, rs, op_unbind );
791 }
792
793 static int
over_op_search(Operation * op,SlapReply * rs)794 over_op_search( Operation *op, SlapReply *rs )
795 {
796 return over_op_func( op, rs, op_search );
797 }
798
799 static int
over_op_compare(Operation * op,SlapReply * rs)800 over_op_compare( Operation *op, SlapReply *rs )
801 {
802 return over_op_func( op, rs, op_compare );
803 }
804
805 static int
over_op_modify(Operation * op,SlapReply * rs)806 over_op_modify( Operation *op, SlapReply *rs )
807 {
808 return over_op_func( op, rs, op_modify );
809 }
810
811 static int
over_op_modrdn(Operation * op,SlapReply * rs)812 over_op_modrdn( Operation *op, SlapReply *rs )
813 {
814 return over_op_func( op, rs, op_modrdn );
815 }
816
817 static int
over_op_add(Operation * op,SlapReply * rs)818 over_op_add( Operation *op, SlapReply *rs )
819 {
820 return over_op_func( op, rs, op_add );
821 }
822
823 static int
over_op_delete(Operation * op,SlapReply * rs)824 over_op_delete( Operation *op, SlapReply *rs )
825 {
826 return over_op_func( op, rs, op_delete );
827 }
828
829 static int
over_op_abandon(Operation * op,SlapReply * rs)830 over_op_abandon( Operation *op, SlapReply *rs )
831 {
832 return over_op_func( op, rs, op_abandon );
833 }
834
835 static int
over_op_cancel(Operation * op,SlapReply * rs)836 over_op_cancel( Operation *op, SlapReply *rs )
837 {
838 return over_op_func( op, rs, op_cancel );
839 }
840
841 static int
over_op_extended(Operation * op,SlapReply * rs)842 over_op_extended( Operation *op, SlapReply *rs )
843 {
844 return over_op_func( op, rs, op_extended );
845 }
846
847 static int
over_aux_operational(Operation * op,SlapReply * rs)848 over_aux_operational( Operation *op, SlapReply *rs )
849 {
850 return over_op_func( op, rs, op_aux_operational );
851 }
852
853 static int
over_aux_chk_referrals(Operation * op,SlapReply * rs)854 over_aux_chk_referrals( Operation *op, SlapReply *rs )
855 {
856 return over_op_func( op, rs, op_aux_chk_referrals );
857 }
858
859 static int
over_aux_chk_controls(Operation * op,SlapReply * rs)860 over_aux_chk_controls( Operation *op, SlapReply *rs )
861 {
862 return over_op_func( op, rs, op_aux_chk_controls );
863 }
864
865 enum conn_which {
866 conn_init = 0,
867 conn_destroy,
868 conn_last
869 };
870
871 static int
over_connection_func(BackendDB * bd,Connection * conn,enum conn_which which)872 over_connection_func(
873 BackendDB *bd,
874 Connection *conn,
875 enum conn_which which
876 )
877 {
878 slap_overinfo *oi;
879 slap_overinst *on;
880 BackendDB db;
881 int rc = SLAP_CB_CONTINUE;
882 BI_connection_init **func;
883
884 /* FIXME: used to happen for instance during abandon
885 * when global overlays are used... */
886 assert( bd != NULL );
887
888 oi = bd->bd_info->bi_private;
889 on = oi->oi_list;
890
891 if ( !SLAP_ISOVERLAY( bd ) ) {
892 db = *bd;
893 db.be_flags |= SLAP_DBFLAG_OVERLAY;
894 bd = &db;
895 }
896
897 for ( ; on; on = on->on_next ) {
898 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DISABLED )
899 continue;
900 func = &on->on_bi.bi_connection_init;
901 if ( func[ which ] ) {
902 bd->bd_info = (BackendInfo *)on;
903 rc = func[ which ]( bd, conn );
904 if ( rc != SLAP_CB_CONTINUE ) break;
905 }
906 }
907
908 func = &oi->oi_orig->bi_connection_init;
909 if ( func[ which ] && rc == SLAP_CB_CONTINUE ) {
910 bd->bd_info = oi->oi_orig;
911 rc = func[ which ]( bd, conn );
912 }
913 /* should not fall thru this far without anything happening... */
914 if ( rc == SLAP_CB_CONTINUE ) {
915 rc = LDAP_UNWILLING_TO_PERFORM;
916 }
917
918 return rc;
919 }
920
921 static int
over_connection_init(BackendDB * bd,Connection * conn)922 over_connection_init(
923 BackendDB *bd,
924 Connection *conn
925 )
926 {
927 return over_connection_func( bd, conn, conn_init );
928 }
929
930 static int
over_connection_destroy(BackendDB * bd,Connection * conn)931 over_connection_destroy(
932 BackendDB *bd,
933 Connection *conn
934 )
935 {
936 return over_connection_func( bd, conn, conn_destroy );
937 }
938
939 int
overlay_register(slap_overinst * on)940 overlay_register(
941 slap_overinst *on
942 )
943 {
944 slap_overinst *tmp;
945
946 /* FIXME: check for duplicates? */
947 for ( tmp = overlays; tmp != NULL; tmp = tmp->on_next ) {
948 if ( strcmp( on->on_bi.bi_type, tmp->on_bi.bi_type ) == 0 ) {
949 Debug( LDAP_DEBUG_ANY,
950 "overlay_register(\"%s\"): "
951 "name already in use.\n",
952 on->on_bi.bi_type );
953 return -1;
954 }
955
956 if ( on->on_bi.bi_obsolete_names != NULL ) {
957 int i;
958
959 for ( i = 0; on->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) {
960 if ( strcmp( on->on_bi.bi_obsolete_names[ i ], tmp->on_bi.bi_type ) == 0 ) {
961 Debug( LDAP_DEBUG_ANY,
962 "overlay_register(\"%s\"): "
963 "obsolete name \"%s\" already in use "
964 "by overlay \"%s\".\n",
965 on->on_bi.bi_type,
966 on->on_bi.bi_obsolete_names[ i ],
967 tmp->on_bi.bi_type );
968 return -1;
969 }
970 }
971 }
972
973 if ( tmp->on_bi.bi_obsolete_names != NULL ) {
974 int i;
975
976 for ( i = 0; tmp->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) {
977 int j;
978
979 if ( strcmp( on->on_bi.bi_type, tmp->on_bi.bi_obsolete_names[ i ] ) == 0 ) {
980 Debug( LDAP_DEBUG_ANY,
981 "overlay_register(\"%s\"): "
982 "name already in use "
983 "as obsolete by overlay \"%s\".\n",
984 on->on_bi.bi_type,
985 tmp->on_bi.bi_obsolete_names[ i ] );
986 return -1;
987 }
988
989 if ( on->on_bi.bi_obsolete_names != NULL ) {
990 for ( j = 0; on->on_bi.bi_obsolete_names[ j ] != NULL; j++ ) {
991 if ( strcmp( on->on_bi.bi_obsolete_names[ j ], tmp->on_bi.bi_obsolete_names[ i ] ) == 0 ) {
992 Debug( LDAP_DEBUG_ANY,
993 "overlay_register(\"%s\"): "
994 "obsolete name \"%s\" already in use "
995 "as obsolete by overlay \"%s\".\n",
996 on->on_bi.bi_type,
997 on->on_bi.bi_obsolete_names[ j ],
998 tmp->on_bi.bi_type );
999 return -1;
1000 }
1001 }
1002 }
1003 }
1004 }
1005 }
1006
1007 on->on_next = overlays;
1008 overlays = on;
1009 return 0;
1010 }
1011
1012 /*
1013 * iterator on registered overlays; overlay_next( NULL ) returns the first
1014 * overlay; subsequent calls with the previously returned value allow to
1015 * iterate over the entire list; returns NULL when no more overlays are
1016 * registered.
1017 */
1018
1019 slap_overinst *
overlay_next(slap_overinst * on)1020 overlay_next(
1021 slap_overinst *on
1022 )
1023 {
1024 if ( on == NULL ) {
1025 return overlays;
1026 }
1027
1028 return on->on_next;
1029 }
1030
1031 /*
1032 * returns a specific registered overlay based on the type; NULL if not
1033 * registered.
1034 */
1035
1036 slap_overinst *
overlay_find(const char * over_type)1037 overlay_find( const char *over_type )
1038 {
1039 slap_overinst *on = overlays;
1040
1041 assert( over_type != NULL );
1042
1043 for ( ; on; on = on->on_next ) {
1044 if ( strcmp( on->on_bi.bi_type, over_type ) == 0 ) {
1045 goto foundit;
1046 }
1047
1048 if ( on->on_bi.bi_obsolete_names != NULL ) {
1049 int i;
1050
1051 for ( i = 0; on->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) {
1052 if ( strcmp( on->on_bi.bi_obsolete_names[ i ], over_type ) == 0 ) {
1053 Debug( LDAP_DEBUG_ANY,
1054 "overlay_find(\"%s\"): "
1055 "obsolete name for \"%s\".\n",
1056 on->on_bi.bi_obsolete_names[ i ],
1057 on->on_bi.bi_type );
1058 goto foundit;
1059 }
1060 }
1061 }
1062 }
1063
1064 foundit:;
1065 return on;
1066 }
1067
1068 static const char overtype[] = "over";
1069
1070 /*
1071 * returns TRUE (1) if the database is actually an overlay instance;
1072 * FALSE (0) otherwise.
1073 */
1074
1075 int
overlay_is_over(BackendDB * be)1076 overlay_is_over( BackendDB *be )
1077 {
1078 return be->bd_info->bi_type == overtype;
1079 }
1080
1081 /*
1082 * returns TRUE (1) if the given database is actually an overlay
1083 * instance and, somewhere in the list, contains the requested overlay;
1084 * FALSE (0) otherwise.
1085 */
1086
1087 int
overlay_is_inst(BackendDB * be,const char * over_type)1088 overlay_is_inst( BackendDB *be, const char *over_type )
1089 {
1090 slap_overinst *on;
1091
1092 assert( be != NULL );
1093
1094 if ( !overlay_is_over( be ) ) {
1095 return 0;
1096 }
1097
1098 on = ((slap_overinfo *)be->bd_info->bi_private)->oi_list;
1099 for ( ; on; on = on->on_next ) {
1100 if ( strcmp( on->on_bi.bi_type, over_type ) == 0 ) {
1101 return 1;
1102 }
1103 }
1104
1105 return 0;
1106 }
1107
1108 int
overlay_register_control(BackendDB * be,const char * oid)1109 overlay_register_control( BackendDB *be, const char *oid )
1110 {
1111 int gotit = 0;
1112 int cid;
1113
1114 if ( slap_find_control_id( oid, &cid ) == LDAP_CONTROL_NOT_FOUND ) {
1115 return -1;
1116 }
1117
1118 if ( SLAP_ISGLOBALOVERLAY( be ) ) {
1119 BackendDB *bd;
1120
1121 /* add to all backends... */
1122 LDAP_STAILQ_FOREACH( bd, &backendDB, be_next ) {
1123 if ( bd == be->bd_self ) {
1124 gotit = 1;
1125 }
1126
1127 /* overlays can be instantiated multiple times, use
1128 * be_ctrls[ cid ] as an instance counter, so that the
1129 * overlay's controls are only really disabled after the
1130 * last instance called overlay_register_control() */
1131 bd->be_ctrls[ cid ]++;
1132 bd->be_ctrls[ SLAP_MAX_CIDS ] = 1;
1133 }
1134
1135 }
1136
1137 if ( !gotit ) {
1138 /* overlays can be instantiated multiple times, use
1139 * be_ctrls[ cid ] as an instance counter, so that the
1140 * overlay's controls are only really unregistered after the
1141 * last instance called overlay_register_control() */
1142 be->bd_self->be_ctrls[ cid ]++;
1143 be->bd_self->be_ctrls[ SLAP_MAX_CIDS ] = 1;
1144 }
1145
1146 return 0;
1147 }
1148
1149 #ifdef SLAP_CONFIG_DELETE
1150 void
overlay_unregister_control(BackendDB * be,const char * oid)1151 overlay_unregister_control( BackendDB *be, const char *oid )
1152 {
1153 int gotit = 0;
1154 int cid;
1155
1156 if ( slap_find_control_id( oid, &cid ) == LDAP_CONTROL_NOT_FOUND ) {
1157 return;
1158 }
1159
1160 if ( SLAP_ISGLOBALOVERLAY( be ) ) {
1161 BackendDB *bd;
1162
1163 /* remove from all backends... */
1164 LDAP_STAILQ_FOREACH( bd, &backendDB, be_next ) {
1165 if ( bd == be->bd_self ) {
1166 gotit = 1;
1167 }
1168
1169 bd->be_ctrls[ cid ]--;
1170 }
1171 }
1172
1173 if ( !gotit ) {
1174 be->bd_self->be_ctrls[ cid ]--;
1175 }
1176 }
1177 #endif /* SLAP_CONFIG_DELETE */
1178
1179 void
overlay_destroy_one(BackendDB * be,slap_overinst * on)1180 overlay_destroy_one( BackendDB *be, slap_overinst *on )
1181 {
1182 slap_overinfo *oi = on->on_info;
1183 slap_overinst **oidx;
1184
1185 for ( oidx = &oi->oi_list; *oidx; oidx = &(*oidx)->on_next ) {
1186 if ( *oidx == on ) {
1187 *oidx = on->on_next;
1188 if ( on->on_bi.bi_db_destroy ) {
1189 BackendInfo *bi_orig = be->bd_info;
1190 be->bd_info = (BackendInfo *)on;
1191 on->on_bi.bi_db_destroy( be, NULL );
1192 be->bd_info = bi_orig;
1193 }
1194 free( on );
1195 break;
1196 }
1197 }
1198 }
1199
1200 #ifdef SLAP_CONFIG_DELETE
1201 typedef struct ov_remove_ctx {
1202 BackendDB be;
1203 slap_overinst *on;
1204 } ov_remove_ctx;
1205
1206 int
overlay_remove_cb(Operation * op,SlapReply * rs)1207 overlay_remove_cb( Operation *op, SlapReply *rs )
1208 {
1209 slap_callback *sc = op->o_callback;
1210 ov_remove_ctx *rm_ctx = (ov_remove_ctx*) op->o_callback->sc_private;
1211
1212 op->o_callback = sc->sc_next;
1213 rm_ctx->be.bd_info = (BackendInfo*) rm_ctx->on;
1214
1215 if ( rm_ctx->on->on_bi.bi_db_close ) {
1216 rm_ctx->on->on_bi.bi_db_close( &rm_ctx->be, NULL );
1217 }
1218 if ( rm_ctx->on->on_bi.bi_db_destroy ) {
1219 rm_ctx->on->on_bi.bi_db_destroy( &rm_ctx->be, NULL );
1220 }
1221
1222 /* clean up after removing last overlay */
1223 if ( ! rm_ctx->on->on_info->oi_list ) {
1224 ch_free(rm_ctx->on->on_info);
1225 }
1226 ch_free( rm_ctx->on );
1227 op->o_tmpfree( sc, op->o_tmpmemctx );
1228 return SLAP_CB_CONTINUE;
1229 }
1230
1231 void
overlay_remove(BackendDB * be,slap_overinst * on,Operation * op)1232 overlay_remove( BackendDB *be, slap_overinst *on, Operation *op )
1233 {
1234 slap_overinfo *oi = on->on_info;
1235 slap_overinst **oidx;
1236 ov_remove_ctx *rm_ctx;
1237 slap_callback *rm_cb, *cb;
1238
1239 /* remove overlay from oi_list */
1240 for ( oidx = &oi->oi_list; *oidx; oidx = &(*oidx)->on_next ) {
1241 if ( *oidx == on ) {
1242 *oidx = on->on_next;
1243 break;
1244 }
1245 }
1246
1247 /* The db_close and db_destroy handlers to cleanup a release
1248 * the overlay's resources are called from the cleanup callback
1249 */
1250
1251 rm_cb = op->o_tmpalloc( sizeof( slap_callback ) + sizeof( ov_remove_ctx ), op->o_tmpmemctx );
1252 rm_cb->sc_next = NULL;
1253 rm_cb->sc_cleanup = overlay_remove_cb;
1254 rm_cb->sc_response = NULL;
1255 rm_cb->sc_private = (void*) ( rm_cb + 1 );
1256 rm_cb->sc_writewait = NULL;
1257
1258 rm_ctx = rm_cb->sc_private;
1259 rm_ctx->be = *be;
1260 rm_ctx->on = on;
1261
1262 /* Append callback to the end of the list */
1263 if ( !op->o_callback ) {
1264 op->o_callback = rm_cb;
1265 } else {
1266 for ( cb = op->o_callback; cb->sc_next; cb = cb->sc_next );
1267 cb->sc_next = rm_cb;
1268 }
1269
1270 /* if this is the last overlay */
1271 if ( ! on->on_info->oi_list ) {
1272 /* reset db flags and bd_info to orig */
1273 SLAP_DBFLAGS( be ) &= ~SLAP_DBFLAG_GLOBAL_OVERLAY;
1274 be->bd_info = on->on_info->oi_orig;
1275 }
1276 }
1277 #endif /* SLAP_CONFIG_DELETE */
1278
1279 void
overlay_insert(BackendDB * be,slap_overinst * on2,slap_overinst *** prev,int idx)1280 overlay_insert( BackendDB *be, slap_overinst *on2, slap_overinst ***prev,
1281 int idx )
1282 {
1283 slap_overinfo *oi = (slap_overinfo *)be->bd_info;
1284
1285 if ( idx == -1 ) {
1286 on2->on_next = oi->oi_list;
1287 oi->oi_list = on2;
1288 } else {
1289 int i, novs;
1290 slap_overinst *on, **prev;
1291
1292 /* Since the list is in reverse order and is singly linked,
1293 * we have to count the overlays and then insert backwards.
1294 * Adding on overlay at a specific point should be a pretty
1295 * infrequent occurrence.
1296 */
1297 novs = 0;
1298 for ( on = oi->oi_list; on; on=on->on_next )
1299 novs++;
1300
1301 if (idx > novs)
1302 idx = 0;
1303 else
1304 idx = novs - idx;
1305
1306 /* advance to insertion point */
1307 prev = &oi->oi_list;
1308 for ( i=0; i<idx; i++ ) {
1309 on = *prev;
1310 prev = &on->on_next;
1311 }
1312 /* insert */
1313 on2->on_next = *prev;
1314 *prev = on2;
1315 }
1316 }
1317
1318 void
overlay_move(BackendDB * be,slap_overinst * on,int idx)1319 overlay_move( BackendDB *be, slap_overinst *on, int idx )
1320 {
1321 slap_overinfo *oi = (slap_overinfo *)be->bd_info;
1322 slap_overinst **onp;
1323
1324 for (onp = &oi->oi_list; *onp; onp= &(*onp)->on_next) {
1325 if ( *onp == on ) {
1326 *onp = on->on_next;
1327 break;
1328 }
1329 }
1330 overlay_insert( be, on, &onp, idx );
1331 }
1332
1333 /* add an overlay to a particular backend. */
1334 int
overlay_config(BackendDB * be,const char * ov,int idx,BackendInfo ** res,ConfigReply * cr)1335 overlay_config( BackendDB *be, const char *ov, int idx, BackendInfo **res, ConfigReply *cr )
1336 {
1337 slap_overinst *on = NULL, *on2 = NULL, **prev;
1338 slap_overinfo *oi = NULL;
1339 BackendInfo *bi = NULL;
1340
1341 if ( res )
1342 *res = NULL;
1343
1344 on = overlay_find( ov );
1345 if ( !on ) {
1346 Debug( LDAP_DEBUG_ANY, "overlay \"%s\" not found\n", ov );
1347 return 1;
1348 }
1349
1350 /* If this is the first overlay on this backend, set up the
1351 * overlay info structure
1352 */
1353 if ( !overlay_is_over( be ) ) {
1354 int isglobal = 0;
1355
1356 /* NOTE: the first time a global overlay is configured,
1357 * frontendDB gets this flag; it is used later by overlays
1358 * to determine if they're stacked on top of the frontendDB */
1359 if ( be->bd_info == frontendDB->bd_info || SLAP_ISGLOBALOVERLAY( be ) ) {
1360 isglobal = 1;
1361 if ( on->on_bi.bi_flags & SLAPO_BFLAG_DBONLY ) {
1362 snprintf( cr->msg, sizeof( cr->msg ), "overlay_config(): "
1363 "overlay \"%s\" cannot be global.", ov );
1364 Debug( LDAP_DEBUG_ANY, "%s\n", cr->msg );
1365 return 1;
1366 }
1367
1368 } else if ( on->on_bi.bi_flags & SLAPO_BFLAG_GLOBONLY ) {
1369 snprintf( cr->msg, sizeof( cr->msg ), "overlay_config(): "
1370 "overlay \"%s\" can only be global.", ov );
1371 Debug( LDAP_DEBUG_ANY, "%s\n", cr->msg );
1372 return 1;
1373 }
1374
1375 oi = ch_malloc( sizeof( slap_overinfo ) );
1376 oi->oi_orig = be->bd_info;
1377 oi->oi_bi = *be->bd_info;
1378 oi->oi_origdb = be;
1379
1380 if ( isglobal ) {
1381 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLOBAL_OVERLAY;
1382 }
1383
1384 /* Save a pointer to ourself in bi_private.
1385 */
1386 oi->oi_bi.bi_private = oi;
1387 oi->oi_list = NULL;
1388 bi = (BackendInfo *)oi;
1389
1390 bi->bi_type = (char *)overtype;
1391
1392 bi->bi_db_config = over_db_config;
1393 bi->bi_db_open = over_db_open;
1394 bi->bi_db_close = over_db_close;
1395 bi->bi_db_destroy = over_db_destroy;
1396
1397 bi->bi_op_bind = over_op_bind;
1398 bi->bi_op_unbind = over_op_unbind;
1399 bi->bi_op_search = over_op_search;
1400 bi->bi_op_compare = over_op_compare;
1401 bi->bi_op_modify = over_op_modify;
1402 bi->bi_op_modrdn = over_op_modrdn;
1403 bi->bi_op_add = over_op_add;
1404 bi->bi_op_delete = over_op_delete;
1405 bi->bi_op_abandon = over_op_abandon;
1406 bi->bi_op_cancel = over_op_cancel;
1407
1408 bi->bi_extended = over_op_extended;
1409
1410 /*
1411 * this is fine because it has the same
1412 * args of the operations; we need to rework
1413 * all the hooks to share the same args
1414 * of the operations...
1415 */
1416 bi->bi_operational = over_aux_operational;
1417 bi->bi_chk_referrals = over_aux_chk_referrals;
1418 bi->bi_chk_controls = over_aux_chk_controls;
1419
1420 /* these have specific arglists */
1421 bi->bi_entry_get_rw = over_entry_get_rw;
1422 bi->bi_entry_release_rw = over_entry_release_rw;
1423 bi->bi_access_allowed = over_access_allowed;
1424 bi->bi_acl_group = over_acl_group;
1425 bi->bi_acl_attribute = over_acl_attribute;
1426
1427 bi->bi_connection_init = over_connection_init;
1428 bi->bi_connection_destroy = over_connection_destroy;
1429
1430 be->bd_info = bi;
1431
1432 } else {
1433 if ( overlay_is_inst( be, ov ) ) {
1434 if ( on->on_bi.bi_flags & SLAPO_BFLAG_SINGLE ) {
1435 snprintf( cr->msg, sizeof( cr->msg ), "overlay_config(): "
1436 "overlay \"%s\" already in list", ov );
1437 Debug( LDAP_DEBUG_ANY, "%s\n", cr->msg );
1438 return 1;
1439 }
1440 }
1441
1442 oi = be->bd_info->bi_private;
1443 }
1444
1445 /* Insert new overlay into list. By default overlays are
1446 * added to head of list and executed in LIFO order.
1447 */
1448 on2 = ch_calloc( 1, sizeof(slap_overinst) );
1449 *on2 = *on;
1450 on2->on_info = oi;
1451
1452 prev = &oi->oi_list;
1453 /* Do we need to find the insertion point? */
1454 if ( idx >= 0 ) {
1455 int i;
1456
1457 /* count current overlays */
1458 for ( i=0, on=oi->oi_list; on; on=on->on_next, i++ );
1459
1460 /* are we just appending a new one? */
1461 if ( idx >= i )
1462 idx = -1;
1463 }
1464 overlay_insert( be, on2, &prev, idx );
1465
1466 /* Any initialization needed? */
1467 if ( on2->on_bi.bi_db_init ) {
1468 int rc;
1469 be->bd_info = (BackendInfo *)on2;
1470 rc = on2->on_bi.bi_db_init( be, cr);
1471 be->bd_info = (BackendInfo *)oi;
1472 if ( rc ) {
1473 *prev = on2->on_next;
1474 ch_free( on2 );
1475 on2 = NULL;
1476 return rc;
1477 }
1478 }
1479
1480 if ( res )
1481 *res = &on2->on_bi;
1482
1483 return 0;
1484 }
1485