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[openldap] / servers / slapd / back-bdb / delete.c
1 /* delete.c - bdb backend delete routine */
2 /* $OpenLDAP$ */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4  *
5  * Copyright 2000-2006 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 #include "portable.h"
18
19 #include <stdio.h>
20 #include <ac/string.h>
21
22 #include "lutil.h"
23 #include "back-bdb.h"
24
25 int
26 bdb_delete( Operation *op, SlapReply *rs )
27 {
28         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
29         Entry   *matched = NULL;
30         struct berval   pdn = {0, NULL};
31         Entry   *e = NULL;
32         Entry   *p = NULL;
33         EntryInfo       *ei = NULL, *eip = NULL;
34         int             manageDSAit = get_manageDSAit( op );
35         AttributeDescription *children = slap_schema.si_ad_children;
36         AttributeDescription *entry = slap_schema.si_ad_entry;
37         DB_TXN          *ltid = NULL, *lt2;
38         struct bdb_op_info opinfo = {0};
39         ID      eid;
40
41         u_int32_t       locker = 0;
42         DB_LOCK         lock, plock;
43
44         int             num_retries = 0;
45
46         int     rc;
47
48         LDAPControl **preread_ctrl = NULL;
49         LDAPControl *ctrls[SLAP_MAX_RESPONSE_CONTROLS];
50         int num_ctrls = 0;
51
52         int     parent_is_glue = 0;
53         int parent_is_leaf = 0;
54
55 #ifdef LDAP_X_TXN
56         int settle = 0;
57 #endif
58
59         Debug( LDAP_DEBUG_ARGS, "==> " LDAP_XSTRING(bdb_delete) ": %s\n",
60                 op->o_req_dn.bv_val, 0, 0 );
61
62 #ifdef LDAP_X_TXN
63         if( op->o_txnSpec ) {
64                 /* acquire connection lock */
65                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
66                 if( op->o_conn->c_txn == CONN_TXN_INACTIVE ) {
67                         rs->sr_text = "invalid transaction identifier";
68                         rs->sr_err = LDAP_X_TXN_ID_INVALID;
69                         goto txnReturn;
70                 } else if( op->o_conn->c_txn == CONN_TXN_SETTLE ) {
71                         settle=1;
72                         goto txnReturn;
73                 }
74
75                 if( op->o_conn->c_txn_backend == NULL ) {
76                         op->o_conn->c_txn_backend = op->o_bd;
77
78                 } else if( op->o_conn->c_txn_backend != op->o_bd ) {
79                         rs->sr_text = "transaction cannot span multiple database contexts";
80                         rs->sr_err = LDAP_AFFECTS_MULTIPLE_DSAS;
81                         goto txnReturn;
82                 }
83
84                 /* insert operation into transaction */
85
86                 rs->sr_text = "transaction specified";
87                 rs->sr_err = LDAP_X_TXN_SPECIFY_OKAY;
88
89 txnReturn:
90                 /* release connection lock */
91                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
92
93                 if( !settle ) {
94                         send_ldap_result( op, rs );
95                         return rs->sr_err;
96                 }
97         }
98 #endif
99
100         ctrls[num_ctrls] = 0;
101
102         /* allocate CSN */
103         if ( BER_BVISEMPTY( &op->o_csn )) {
104                 struct berval csn;
105                 char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
106
107                 csn.bv_val = csnbuf;
108                 csn.bv_len = sizeof(csnbuf);
109                 slap_get_csn( op, &csn, 1 );
110         }
111
112         if( 0 ) {
113 retry:  /* transaction retry */
114                 if( e != NULL ) {
115                         bdb_unlocked_cache_return_entry_w(&bdb->bi_cache, e);
116                         e = NULL;
117                 }
118                 if( p != NULL ) {
119                         bdb_unlocked_cache_return_entry_r(&bdb->bi_cache, p);
120                         p = NULL;
121                 }
122                 Debug( LDAP_DEBUG_TRACE,
123                         "==> " LDAP_XSTRING(bdb_delete) ": retrying...\n",
124                         0, 0, 0 );
125                 rs->sr_err = TXN_ABORT( ltid );
126                 ltid = NULL;
127                 op->o_private = NULL;
128                 op->o_do_not_cache = opinfo.boi_acl_cache;
129                 if( rs->sr_err != 0 ) {
130                         rs->sr_err = LDAP_OTHER;
131                         rs->sr_text = "internal error";
132                         goto return_results;
133                 }
134                 if ( op->o_abandon ) {
135                         rs->sr_err = SLAPD_ABANDON;
136                         goto return_results;
137                 }
138                 parent_is_glue = 0;
139                 parent_is_leaf = 0;
140                 bdb_trans_backoff( ++num_retries );
141         }
142
143         /* begin transaction */
144         rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL, &ltid, 
145                 bdb->bi_db_opflags );
146         rs->sr_text = NULL;
147         if( rs->sr_err != 0 ) {
148                 Debug( LDAP_DEBUG_TRACE,
149                         LDAP_XSTRING(bdb_delete) ": txn_begin failed: "
150                         "%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
151                 rs->sr_err = LDAP_OTHER;
152                 rs->sr_text = "internal error";
153                 goto return_results;
154         }
155
156         locker = TXN_ID ( ltid );
157
158         opinfo.boi_bdb = op->o_bd;
159         opinfo.boi_txn = ltid;
160         opinfo.boi_locker = locker;
161         opinfo.boi_err = 0;
162         opinfo.boi_acl_cache = op->o_do_not_cache;
163         op->o_private = &opinfo;
164
165         if ( !be_issuffix( op->o_bd, &op->o_req_ndn ) ) {
166                 dnParent( &op->o_req_ndn, &pdn );
167         }
168
169         /* get entry */
170         rs->sr_err = bdb_dn2entry( op, ltid, &op->o_req_ndn, &ei, 1,
171                 locker, &lock );
172
173         switch( rs->sr_err ) {
174         case 0:
175         case DB_NOTFOUND:
176                 break;
177         case DB_LOCK_DEADLOCK:
178         case DB_LOCK_NOTGRANTED:
179                 goto retry;
180         case LDAP_BUSY:
181                 rs->sr_text = "ldap server busy";
182                 goto return_results;
183         default:
184                 rs->sr_err = LDAP_OTHER;
185                 rs->sr_text = "internal error";
186                 goto return_results;
187         }
188
189         if ( rs->sr_err == 0 ) {
190                 e = ei->bei_e;
191                 eip = ei->bei_parent;
192         } else {
193                 matched = ei->bei_e;
194         }
195
196         /* FIXME : dn2entry() should return non-glue entry */
197         if ( e == NULL || ( !manageDSAit && is_entry_glue( e ))) {
198                 Debug( LDAP_DEBUG_ARGS,
199                         "<=- " LDAP_XSTRING(bdb_delete) ": no such object %s\n",
200                         op->o_req_dn.bv_val, 0, 0);
201
202                 if ( matched != NULL ) {
203                         rs->sr_matched = ch_strdup( matched->e_dn );
204                         rs->sr_ref = is_entry_referral( matched )
205                                 ? get_entry_referrals( op, matched )
206                                 : NULL;
207                         bdb_unlocked_cache_return_entry_r(&bdb->bi_cache, matched);
208                         matched = NULL;
209
210                 } else {
211                         rs->sr_ref = referral_rewrite( default_referral, NULL,
212                                         &op->o_req_dn, LDAP_SCOPE_DEFAULT );
213                 }
214
215                 rs->sr_err = LDAP_REFERRAL;
216                 rs->sr_flags = REP_MATCHED_MUSTBEFREED | REP_REF_MUSTBEFREED;
217                 goto return_results;
218         }
219
220         rc = bdb_cache_find_id( op, ltid, eip->bei_id, &eip, 0, locker, &plock );
221         switch( rc ) {
222         case DB_LOCK_DEADLOCK:
223         case DB_LOCK_NOTGRANTED:
224                 goto retry;
225         case 0:
226         case DB_NOTFOUND:
227                 break;
228         default:
229                 rs->sr_err = LDAP_OTHER;
230                 rs->sr_text = "internal error";
231                 goto return_results;
232         }
233         if ( eip ) p = eip->bei_e;
234
235         if ( pdn.bv_len != 0 ) {
236                 if( p == NULL || !bvmatch( &pdn, &p->e_nname )) {
237                         Debug( LDAP_DEBUG_TRACE,
238                                 "<=- " LDAP_XSTRING(bdb_delete) ": parent "
239                                 "does not exist\n", 0, 0, 0 );
240                         rs->sr_err = LDAP_OTHER;
241                         rs->sr_text = "could not locate parent of entry";
242                         goto return_results;
243                 }
244
245                 /* check parent for "children" acl */
246                 rs->sr_err = access_allowed( op, p,
247                         children, NULL, ACL_WDEL, NULL );
248
249                 if ( !rs->sr_err  ) {
250                         switch( opinfo.boi_err ) {
251                         case DB_LOCK_DEADLOCK:
252                         case DB_LOCK_NOTGRANTED:
253                                 goto retry;
254                         }
255
256                         Debug( LDAP_DEBUG_TRACE,
257                                 "<=- " LDAP_XSTRING(bdb_delete) ": no write "
258                                 "access to parent\n", 0, 0, 0 );
259                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
260                         rs->sr_text = "no write access to parent";
261                         goto return_results;
262                 }
263
264         } else {
265                 /* no parent, must be root to delete */
266                 if( ! be_isroot( op ) ) {
267                         if ( be_issuffix( op->o_bd, (struct berval *)&slap_empty_bv )
268                                 || be_shadow_update( op ) ) {
269                                 p = (Entry *)&slap_entry_root;
270
271                                 /* check parent for "children" acl */
272                                 rs->sr_err = access_allowed( op, p,
273                                         children, NULL, ACL_WDEL, NULL );
274
275                                 p = NULL;
276
277                                 if ( !rs->sr_err  ) {
278                                         switch( opinfo.boi_err ) {
279                                         case DB_LOCK_DEADLOCK:
280                                         case DB_LOCK_NOTGRANTED:
281                                                 goto retry;
282                                         }
283
284                                         Debug( LDAP_DEBUG_TRACE,
285                                                 "<=- " LDAP_XSTRING(bdb_delete)
286                                                 ": no access to parent\n",
287                                                 0, 0, 0 );
288                                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
289                                         rs->sr_text = "no write access to parent";
290                                         goto return_results;
291                                 }
292
293                         } else {
294                                 Debug( LDAP_DEBUG_TRACE,
295                                         "<=- " LDAP_XSTRING(bdb_delete)
296                                         ": no parent and not root\n", 0, 0, 0 );
297                                 rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
298                                 goto return_results;
299                         }
300                 }
301         }
302
303         if ( get_assert( op ) &&
304                 ( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
305         {
306                 rs->sr_err = LDAP_ASSERTION_FAILED;
307                 goto return_results;
308         }
309
310         rs->sr_err = access_allowed( op, e,
311                 entry, NULL, ACL_WDEL, NULL );
312
313         if ( !rs->sr_err  ) {
314                 switch( opinfo.boi_err ) {
315                 case DB_LOCK_DEADLOCK:
316                 case DB_LOCK_NOTGRANTED:
317                         goto retry;
318                 }
319
320                 Debug( LDAP_DEBUG_TRACE,
321                         "<=- " LDAP_XSTRING(bdb_delete) ": no write access "
322                         "to entry\n", 0, 0, 0 );
323                 rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
324                 rs->sr_text = "no write access to entry";
325                 goto return_results;
326         }
327
328         if ( !manageDSAit && is_entry_referral( e ) ) {
329                 /* entry is a referral, don't allow delete */
330                 rs->sr_ref = get_entry_referrals( op, e );
331
332                 Debug( LDAP_DEBUG_TRACE,
333                         LDAP_XSTRING(bdb_delete) ": entry is referral\n",
334                         0, 0, 0 );
335
336                 rs->sr_err = LDAP_REFERRAL;
337                 rs->sr_matched = ch_strdup( e->e_name.bv_val );
338                 rs->sr_flags = REP_MATCHED_MUSTBEFREED | REP_REF_MUSTBEFREED;
339                 goto return_results;
340         }
341
342         /* pre-read */
343         if( op->o_preread ) {
344                 if( preread_ctrl == NULL ) {
345                         preread_ctrl = &ctrls[num_ctrls++];
346                         ctrls[num_ctrls] = NULL;
347                 }
348                 if( slap_read_controls( op, rs, e,
349                         &slap_pre_read_bv, preread_ctrl ) )
350                 {
351                         Debug( LDAP_DEBUG_TRACE,
352                                 "<=- " LDAP_XSTRING(bdb_delete) ": pre-read "
353                                 "failed!\n", 0, 0, 0 );
354                         goto return_results;
355                 }
356         }
357
358         /* nested transaction */
359         rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, ltid, &lt2, 
360                 bdb->bi_db_opflags );
361         rs->sr_text = NULL;
362         if( rs->sr_err != 0 ) {
363                 Debug( LDAP_DEBUG_TRACE,
364                         LDAP_XSTRING(bdb_delete) ": txn_begin(2) failed: "
365                         "%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
366                 rs->sr_err = LDAP_OTHER;
367                 rs->sr_text = "internal error";
368                 goto return_results;
369         }
370
371         /* Can't do it if we have kids */
372         rs->sr_err = bdb_cache_children( op, lt2, e );
373         if( rs->sr_err != DB_NOTFOUND ) {
374                 switch( rs->sr_err ) {
375                 case DB_LOCK_DEADLOCK:
376                 case DB_LOCK_NOTGRANTED:
377                         goto retry;
378                 case 0:
379                         Debug(LDAP_DEBUG_ARGS,
380                                 "<=- " LDAP_XSTRING(bdb_delete)
381                                 ": non-leaf %s\n",
382                                 op->o_req_dn.bv_val, 0, 0);
383                         rs->sr_err = LDAP_NOT_ALLOWED_ON_NONLEAF;
384                         rs->sr_text = "subordinate objects must be deleted first";
385                         break;
386                 default:
387                         Debug(LDAP_DEBUG_ARGS,
388                                 "<=- " LDAP_XSTRING(bdb_delete)
389                                 ": has_children failed: %s (%d)\n",
390                                 db_strerror(rs->sr_err), rs->sr_err, 0 );
391                         rs->sr_err = LDAP_OTHER;
392                         rs->sr_text = "internal error";
393                 }
394                 goto return_results;
395         }
396
397         /* delete from dn2id */
398         rs->sr_err = bdb_dn2id_delete( op, lt2, eip, e );
399         if ( rs->sr_err != 0 ) {
400                 Debug(LDAP_DEBUG_TRACE,
401                         "<=- " LDAP_XSTRING(bdb_delete) ": dn2id failed: "
402                         "%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
403                 switch( rs->sr_err ) {
404                 case DB_LOCK_DEADLOCK:
405                 case DB_LOCK_NOTGRANTED:
406                         goto retry;
407                 }
408                 rs->sr_text = "DN index delete failed";
409                 rs->sr_err = LDAP_OTHER;
410                 goto return_results;
411         }
412
413         /* delete indices for old attributes */
414         rs->sr_err = bdb_index_entry_del( op, lt2, e );
415         if ( rs->sr_err != LDAP_SUCCESS ) {
416                 Debug(LDAP_DEBUG_TRACE,
417                         "<=- " LDAP_XSTRING(bdb_delete) ": index failed: "
418                         "%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
419                 switch( rs->sr_err ) {
420                 case DB_LOCK_DEADLOCK:
421                 case DB_LOCK_NOTGRANTED:
422                         goto retry;
423                 }
424                 rs->sr_text = "entry index delete failed";
425                 rs->sr_err = LDAP_OTHER;
426                 goto return_results;
427         }
428
429         /* fixup delete CSN */
430         if ( !SLAP_SHADOW( op->o_bd )) {
431                 struct berval vals[2];
432
433                 assert( !BER_BVISNULL( &op->o_csn ) );
434                 vals[0] = op->o_csn;
435                 BER_BVZERO( &vals[1] );
436                 rs->sr_err = bdb_index_values( op, lt2, slap_schema.si_ad_entryCSN,
437                         vals, 0, SLAP_INDEX_ADD_OP );
438         if ( rs->sr_err != LDAP_SUCCESS ) {
439                         switch( rs->sr_err ) {
440                         case DB_LOCK_DEADLOCK:
441                         case DB_LOCK_NOTGRANTED:
442                                 goto retry;
443                         }
444                         rs->sr_text = "entryCSN index update failed";
445                         rs->sr_err = LDAP_OTHER;
446                         goto return_results;
447                 }
448         }
449
450         /* delete from id2entry */
451         rs->sr_err = bdb_id2entry_delete( op->o_bd, lt2, e );
452         if ( rs->sr_err != 0 ) {
453                 Debug( LDAP_DEBUG_TRACE,
454                         "<=- " LDAP_XSTRING(bdb_delete) ": id2entry failed: "
455                         "%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
456                 switch( rs->sr_err ) {
457                 case DB_LOCK_DEADLOCK:
458                 case DB_LOCK_NOTGRANTED:
459                         goto retry;
460                 }
461                 rs->sr_text = "entry delete failed";
462                 rs->sr_err = LDAP_OTHER;
463                 goto return_results;
464         }
465
466         if ( pdn.bv_len != 0 ) {
467                 parent_is_glue = is_entry_glue(p);
468                 rs->sr_err = bdb_cache_children( op, lt2, p );
469                 if ( rs->sr_err != DB_NOTFOUND ) {
470                         switch( rs->sr_err ) {
471                         case DB_LOCK_DEADLOCK:
472                         case DB_LOCK_NOTGRANTED:
473                                 goto retry;
474                         case 0:
475                                 break;
476                         default:
477                                 Debug(LDAP_DEBUG_ARGS,
478                                         "<=- " LDAP_XSTRING(bdb_delete)
479                                         ": has_children failed: %s (%d)\n",
480                                         db_strerror(rs->sr_err), rs->sr_err, 0 );
481                                 rs->sr_err = LDAP_OTHER;
482                                 rs->sr_text = "internal error";
483                                 goto return_results;
484                         }
485                         parent_is_leaf = 1;
486                 }
487                 bdb_unlocked_cache_return_entry_r(&bdb->bi_cache, p);
488                 p = NULL;
489         }
490
491         if ( TXN_COMMIT( lt2, 0 ) != 0 ) {
492                 rs->sr_err = LDAP_OTHER;
493                 rs->sr_text = "txn_commit(2) failed";
494                 goto return_results;
495         }
496
497         eid = e->e_id;
498
499 #if 0   /* Do we want to reclaim deleted IDs? */
500         ldap_pvt_thread_mutex_lock( &bdb->bi_lastid_mutex );
501         if ( e->e_id == bdb->bi_lastid ) {
502                 bdb_last_id( op->o_bd, ltid );
503         }
504         ldap_pvt_thread_mutex_unlock( &bdb->bi_lastid_mutex );
505 #endif
506
507         if( op->o_noop ) {
508                 if ( ( rs->sr_err = TXN_ABORT( ltid ) ) != 0 ) {
509                         rs->sr_text = "txn_abort (no-op) failed";
510                 } else {
511                         rs->sr_err = LDAP_X_NO_OPERATION;
512                         ltid = NULL;
513                         goto return_results;
514                 }
515         } else {
516                 rc = bdb_cache_delete( &bdb->bi_cache, e, bdb->bi_dbenv,
517                         locker, &lock );
518                 switch( rc ) {
519                 case DB_LOCK_DEADLOCK:
520                 case DB_LOCK_NOTGRANTED:
521                         goto retry;
522                 }
523
524                 rs->sr_err = TXN_COMMIT( ltid, 0 );
525         }
526         ltid = NULL;
527         op->o_private = NULL;
528
529         if( rs->sr_err != 0 ) {
530                 Debug( LDAP_DEBUG_TRACE,
531                         LDAP_XSTRING(bdb_delete) ": txn_%s failed: %s (%d)\n",
532                         op->o_noop ? "abort (no-op)" : "commit",
533                         db_strerror(rs->sr_err), rs->sr_err );
534                 rs->sr_err = LDAP_OTHER;
535                 rs->sr_text = "commit failed";
536
537                 goto return_results;
538         }
539
540         Debug( LDAP_DEBUG_TRACE,
541                 LDAP_XSTRING(bdb_delete) ": deleted%s id=%08lx dn=\"%s\"\n",
542                 op->o_noop ? " (no-op)" : "",
543                 eid, op->o_req_dn.bv_val );
544         rs->sr_err = LDAP_SUCCESS;
545         rs->sr_text = NULL;
546         if( num_ctrls ) rs->sr_ctrls = ctrls;
547
548 return_results:
549         if ( rs->sr_err == LDAP_SUCCESS && parent_is_glue && parent_is_leaf ) {
550                 op->o_delete_glue_parent = 1;
551         }
552
553         if ( p )
554                 bdb_unlocked_cache_return_entry_r(&bdb->bi_cache, p);
555
556         /* free entry */
557         if( e != NULL ) {
558                 if ( rs->sr_err == LDAP_SUCCESS ) {
559                         /* Free the EntryInfo and the Entry */
560                         bdb_cache_delete_cleanup( &bdb->bi_cache, BEI(e) );
561                 } else {
562                         bdb_unlocked_cache_return_entry_w(&bdb->bi_cache, e);
563                 }
564         }
565
566         if( ltid != NULL ) {
567                 TXN_ABORT( ltid );
568         }
569         op->o_private = NULL;
570
571         send_ldap_result( op, rs );
572         slap_graduate_commit_csn( op );
573
574         if( preread_ctrl != NULL && (*preread_ctrl) != NULL ) {
575                 slap_sl_free( (*preread_ctrl)->ldctl_value.bv_val, op->o_tmpmemctx );
576                 slap_sl_free( *preread_ctrl, op->o_tmpmemctx );
577         }
578
579         if( rs->sr_err == LDAP_SUCCESS && bdb->bi_txn_cp ) {
580                 TXN_CHECKPOINT( bdb->bi_dbenv,
581                         bdb->bi_txn_cp_kbyte, bdb->bi_txn_cp_min, 0 );
582         }
583         return rs->sr_err;
584 }