1 /* backover.c - backend overlay routines */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
5 * Copyright 2003-2004 The OpenLDAP Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
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>.
17 /* Functions to overlay other modules over a backend. */
23 #include <ac/string.h>
24 #include <ac/socket.h>
29 static slap_overinst *overlays;
31 enum db_which { db_open = 0, db_close, db_destroy };
39 slap_overinfo *oi = be->bd_info->bi_private;
40 slap_overinst *on = oi->oi_list;
41 BackendInfo *bi_orig = be->bd_info;
45 func = &oi->oi_orig->bi_db_open;
47 be->bd_info = oi->oi_orig;
48 rc = func[which]( be );
51 for (; on && rc == 0; on=on->on_next) {
52 be->bd_info = &on->on_bi;
53 func = &on->on_bi.bi_db_open;
55 rc = func[which]( be );
58 be->bd_info = bi_orig;
71 slap_overinfo *oi = be->bd_info->bi_private;
72 slap_overinst *on = oi->oi_list;
73 BackendInfo *bi_orig = be->bd_info;
76 if ( oi->oi_orig->bi_db_config ) {
77 be->bd_info = oi->oi_orig;
78 rc = oi->oi_orig->bi_db_config( be, fname, lineno,
81 if ( be->bd_info != oi->oi_orig ) {
83 slap_overinst *on2, **onp;
87 /* a database added an overlay;
88 * work it around... */
89 assert( overlay_is_over( be ) );
91 oi2 = ( slap_overinfo * )be->bd_info->bi_private;
94 /* need to put a uniqueness check here as well;
95 * note that in principle there could be more than
96 * one overlay as a result of multiple calls to
98 be2.bd_info = (BackendInfo *)oi;
100 for ( i = 0, onp = &on2; *onp; i++, onp = &(*onp)->on_next ) {
101 if ( overlay_is_inst( &be2, (*onp)->on_bi.bi_type ) ) {
102 Debug( LDAP_DEBUG_ANY, "over_db_config(): "
103 "warning, freshly added "
104 "overlay #%d \"%s\" is already in list\n",
105 i, (*onp)->on_bi.bi_type, 0 );
107 /* NOTE: if the overlay already exists,
108 * there is no way to merge the results
109 * of the configuration that may have
110 * occurred during bi_db_config(); we
111 * just issue a warning, and the
112 * administrator should deal with this */
119 ch_free( be->bd_info );
122 be->bd_info = (BackendInfo *)oi;
123 if ( rc != SLAP_CONF_UNKNOWN ) return rc;
126 for (; on; on=on->on_next) {
127 if (on->on_bi.bi_db_config) {
128 be->bd_info = &on->on_bi;
129 rc = on->on_bi.bi_db_config( be, fname, lineno,
131 if ( rc != SLAP_CONF_UNKNOWN ) break;
134 be->bd_info = bi_orig;
143 return over_db_func( be, db_open );
151 slap_overinfo *oi = be->bd_info->bi_private;
152 slap_overinst *on = oi->oi_list;
153 BackendInfo *bi_orig = be->bd_info;
156 for (; on && rc == 0; on=on->on_next) {
157 be->bd_info = &on->on_bi;
158 if ( be->bd_info->bi_db_close ) {
159 rc = be->bd_info->bi_db_close( be );
163 if ( oi->oi_orig->bi_db_close ) {
164 be->bd_info = oi->oi_orig;
165 rc = be->bd_info->bi_db_close( be );
168 be->bd_info = bi_orig;
177 slap_overinfo *oi = be->bd_info->bi_private;
178 slap_overinst *on = oi->oi_list, *next;
181 rc = over_db_func( be, db_destroy );
183 for (next = on->on_next; on; on=next) {
192 over_back_response ( Operation *op, SlapReply *rs )
194 slap_overinfo *oi = op->o_callback->sc_private;
195 slap_overinst *on = oi->oi_list;
196 int rc = SLAP_CB_CONTINUE;
197 BackendDB *be = op->o_bd, db = *op->o_bd;
199 db.be_flags |= SLAP_DBFLAG_OVERLAY;
201 for (; on; on=on->on_next ) {
202 if ( on->on_response ) {
203 db.bd_info = (BackendInfo *)on;
204 rc = on->on_response( op, rs );
205 if ( rc != SLAP_CB_CONTINUE ) break;
225 op_aux_chk_referrals,
230 * default return code in case of missing backend function
231 * and overlay stack returning SLAP_CB_CONTINUE
233 static int op_rc[] = {
234 LDAP_UNWILLING_TO_PERFORM, /* bind */
235 LDAP_UNWILLING_TO_PERFORM, /* unbind */
236 LDAP_UNWILLING_TO_PERFORM, /* search */
237 LDAP_UNWILLING_TO_PERFORM, /* compare */
238 LDAP_UNWILLING_TO_PERFORM, /* modify */
239 LDAP_UNWILLING_TO_PERFORM, /* modrdn */
240 LDAP_UNWILLING_TO_PERFORM, /* add */
241 LDAP_UNWILLING_TO_PERFORM, /* delete */
242 LDAP_UNWILLING_TO_PERFORM, /* abandon */
243 LDAP_UNWILLING_TO_PERFORM, /* cancel */
244 LDAP_UNWILLING_TO_PERFORM, /* extended */
245 LDAP_SUCCESS, /* aux_operational */
246 LDAP_SUCCESS /* aux_chk_referrals */
259 BackendDB *be = op->o_bd, db;
260 slap_callback cb = {NULL, over_back_response, NULL, NULL};
261 int rc = SLAP_CB_CONTINUE;
263 if ( op->o_bd == NULL ) {
264 /* FIXME: happens for instance during abandon... */
268 oi = op->o_bd->bd_info->bi_private;
271 if ( !SLAP_ISOVERLAY( op->o_bd )) {
273 db.be_flags |= SLAP_DBFLAG_OVERLAY;
276 cb.sc_next = op->o_callback;
278 op->o_callback = &cb;
280 for (; on; on=on->on_next ) {
281 func = &on->on_bi.bi_op_bind;
283 db.bd_info = (BackendInfo *)on;
284 rc = func[which]( op, rs );
285 if ( rc != SLAP_CB_CONTINUE ) break;
289 func = &oi->oi_orig->bi_op_bind;
290 if ( func[which] && rc == SLAP_CB_CONTINUE ) {
291 db.bd_info = oi->oi_orig;
292 rc = func[which]( op, rs );
294 /* should not fall thru this far without anything happening... */
295 if ( rc == SLAP_CB_CONTINUE ) {
299 op->o_callback = cb.sc_next;
304 over_op_bind( Operation *op, SlapReply *rs )
306 return over_op_func( op, rs, op_bind );
310 over_op_unbind( Operation *op, SlapReply *rs )
312 return over_op_func( op, rs, op_unbind );
316 over_op_search( Operation *op, SlapReply *rs )
318 return over_op_func( op, rs, op_search );
322 over_op_compare( Operation *op, SlapReply *rs )
324 return over_op_func( op, rs, op_compare );
328 over_op_modify( Operation *op, SlapReply *rs )
330 return over_op_func( op, rs, op_modify );
334 over_op_modrdn( Operation *op, SlapReply *rs )
336 return over_op_func( op, rs, op_modrdn );
340 over_op_add( Operation *op, SlapReply *rs )
342 return over_op_func( op, rs, op_add );
346 over_op_delete( Operation *op, SlapReply *rs )
348 return over_op_func( op, rs, op_delete );
352 over_op_abandon( Operation *op, SlapReply *rs )
354 return over_op_func( op, rs, op_abandon );
358 over_op_cancel( Operation *op, SlapReply *rs )
360 return over_op_func( op, rs, op_cancel );
364 over_op_extended( Operation *op, SlapReply *rs )
366 return over_op_func( op, rs, op_extended );
370 over_aux_operational( Operation *op, SlapReply *rs )
372 return over_op_func( op, rs, op_aux_operational );
376 over_aux_chk_referrals( Operation *op, SlapReply *rs )
378 return over_op_func( op, rs, op_aux_chk_referrals );
386 on->on_next = overlays;
392 * iterator on registered overlays; overlay_next( NULL ) returns the first
393 * overlay; * subsequent calls with the previously returned value allow to
394 * iterate * over the entire list; returns NULL when no more overlays are
411 * returns a specific registered overlay based on the type; NULL if not
416 overlay_find( const char *over_type )
418 slap_overinst *on = overlays;
422 for ( ; on; on = on->on_next ) {
423 if ( strcmp( on->on_bi.bi_type, over_type ) == 0 ) {
431 static const char overtype[] = "over";
434 * returns TRUE (1) if the database is actually an overlay instance;
435 * FALSE (0) otherwise.
439 overlay_is_over( BackendDB *be )
441 return be->bd_info->bi_type == overtype;
445 * returns TRUE (1) if the given database is actually an overlay
446 * instance and, somewhere in the list, contains the requested overlay;
447 * FALSE (0) otherwise.
451 overlay_is_inst( BackendDB *be, const char *over_type )
457 if ( !overlay_is_over( be ) ) {
461 on = ((slap_overinfo *)be->bd_info->bi_private)->oi_list;
462 for ( ; on; on = on->on_next ) {
463 if ( strcmp( on->on_bi.bi_type, over_type ) == 0 ) {
471 /* add an overlay to a particular backend. */
473 overlay_config( BackendDB *be, const char *ov )
475 slap_overinst *on = NULL, *on2 = NULL;
476 slap_overinfo *oi = NULL;
477 BackendInfo *bi = NULL;
479 on = overlay_find( ov );
481 Debug( LDAP_DEBUG_ANY, "overlay \"%s\" not found\n", ov, 0, 0 );
485 /* If this is the first overlay on this backend, set up the
486 * overlay info structure
488 if ( !overlay_is_over( be ) ) {
489 oi = ch_malloc( sizeof( slap_overinfo ) );
490 oi->oi_orig = be->bd_info;
491 oi->oi_bi = *be->bd_info;
493 /* Save a pointer to ourself in bi_private.
495 oi->oi_bi.bi_private = oi;
497 bi = (BackendInfo *)oi;
499 bi->bi_type = (char *)overtype;
501 bi->bi_db_config = over_db_config;
502 bi->bi_db_open = over_db_open;
503 bi->bi_db_close = over_db_close;
504 bi->bi_db_destroy = over_db_destroy;
506 bi->bi_op_bind = over_op_bind;
507 bi->bi_op_unbind = over_op_unbind;
508 bi->bi_op_search = over_op_search;
509 bi->bi_op_compare = over_op_compare;
510 bi->bi_op_modify = over_op_modify;
511 bi->bi_op_modrdn = over_op_modrdn;
512 bi->bi_op_add = over_op_add;
513 bi->bi_op_delete = over_op_delete;
514 bi->bi_op_abandon = over_op_abandon;
515 bi->bi_op_cancel = over_op_cancel;
517 bi->bi_extended = over_op_extended;
520 * this is fine because it has the same
521 * args of the operations; we need to rework
522 * all the hooks to share the same args
523 * of the operations...
525 bi->bi_operational = over_aux_operational;
526 bi->bi_chk_referrals = over_aux_chk_referrals;
531 if ( overlay_is_inst( be, ov ) ) {
532 Debug( LDAP_DEBUG_ANY, "overlay_config(): "
533 "warning, overlay \"%s\" "
534 "already in list\n", ov, 0, 0 );
537 oi = be->bd_info->bi_private;
540 /* Insert new overlay on head of list. Overlays are executed
541 * in reverse of config order...
543 on2 = ch_calloc( 1, sizeof(slap_overinst) );
546 on2->on_next = oi->oi_list;
549 /* Any initialization needed? */
550 if ( on->on_bi.bi_db_init ) {
551 be->bd_info = (BackendInfo *)on2;
552 on2->on_bi.bi_db_init( be );
553 be->bd_info = (BackendInfo *)oi;