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[openldap] / servers / slapd / ctxcsn.c
1 /* ctxcsn.c -- Context CSN Management Routines */
2 /* $OpenLDAP$ */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4  *
5  * Copyright 2003-2013 The OpenLDAP Foundation.
6  * Portions Copyright 2003 IBM Corporation.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted only as authorized by the OpenLDAP
11  * Public License.
12  *
13  * A copy of this license is available in the file LICENSE in the
14  * top-level directory of the distribution or, alternatively, at
15  * <http://www.OpenLDAP.org/license.html>.
16  */
17
18 #include "portable.h"
19
20 #include <stdio.h>
21
22 #include <ac/string.h>
23 #include <ac/socket.h>
24
25 #include "lutil.h"
26 #include "slap.h"
27 #include "lutil_ldap.h"
28
29 const struct berval slap_ldapsync_bv = BER_BVC("ldapsync");
30 const struct berval slap_ldapsync_cn_bv = BER_BVC("cn=ldapsync");
31 int slap_serverID;
32
33 /* maxcsn->bv_val must point to a char buf[LDAP_PVT_CSNSTR_BUFSIZE] */
34 void
35 slap_get_commit_csn(
36         Operation *op,
37         struct berval *maxcsn,
38         int *foundit
39 )
40 {
41         struct slap_csn_entry *csne, *committed_csne = NULL;
42         BackendDB *be = op->o_bd->bd_self;
43         int sid = -1;
44
45         if ( maxcsn ) {
46                 assert( maxcsn->bv_val != NULL );
47                 assert( maxcsn->bv_len >= LDAP_PVT_CSNSTR_BUFSIZE );
48         }
49         if ( foundit ) {
50                 *foundit = 0;
51         }
52
53         if ( !BER_BVISEMPTY( &op->o_csn )) {
54                 sid = slap_parse_csn_sid( &op->o_csn );
55         }
56
57         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
58
59         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
60                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
61                         csne->ce_state = SLAP_CSN_COMMIT;
62                         if ( foundit ) *foundit = 1;
63                         break;
64                 }
65         }
66
67         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
68                 if ( sid != -1 && sid == csne->ce_sid ) {
69                         if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
70                         if ( csne->ce_state == SLAP_CSN_PENDING ) break;
71                 }
72         }
73
74         if ( maxcsn ) {
75                 if ( committed_csne ) {
76                         if ( committed_csne->ce_csn.bv_len < maxcsn->bv_len )
77                                 maxcsn->bv_len = committed_csne->ce_csn.bv_len;
78                         AC_MEMCPY( maxcsn->bv_val, committed_csne->ce_csn.bv_val,
79                                 maxcsn->bv_len+1 );
80                 } else {
81                         maxcsn->bv_len = 0;
82                         maxcsn->bv_val[0] = 0;
83                 }
84         }
85         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
86 }
87
88 void
89 slap_rewind_commit_csn( Operation *op )
90 {
91         struct slap_csn_entry *csne;
92         BackendDB *be = op->o_bd->bd_self;
93
94         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
95
96         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
97                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
98                         csne->ce_state = SLAP_CSN_PENDING;
99                         break;
100                 }
101         }
102
103         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
104 }
105
106 void
107 slap_graduate_commit_csn( Operation *op )
108 {
109         struct slap_csn_entry *csne;
110         BackendDB *be;
111
112         if ( op == NULL ) return;
113         if ( op->o_bd == NULL ) return;
114         be = op->o_bd->bd_self;
115
116         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
117
118         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
119                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
120                         LDAP_TAILQ_REMOVE( be->be_pending_csn_list,
121                                 csne, ce_csn_link );
122                         Debug( LDAP_DEBUG_SYNC, "slap_graduate_commit_csn: removing %p %s\n",
123                                 csne->ce_csn.bv_val, csne->ce_csn.bv_val, 0 );
124                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
125                                 BER_BVZERO( &op->o_csn );
126                         }
127                         ch_free( csne->ce_csn.bv_val );
128                         ch_free( csne );
129                         break;
130                 }
131         }
132
133         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
134
135         return;
136 }
137
138 static struct berval ocbva[] = {
139         BER_BVC("top"),
140         BER_BVC("subentry"),
141         BER_BVC("syncProviderSubentry"),
142         BER_BVNULL
143 };
144
145 Entry *
146 slap_create_context_csn_entry(
147         Backend *be,
148         struct berval *context_csn )
149 {
150         Entry* e;
151
152         struct berval bv;
153
154         e = entry_alloc();
155
156         attr_merge( e, slap_schema.si_ad_objectClass,
157                 ocbva, NULL );
158         attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
159                 &ocbva[1], NULL );
160         attr_merge_one( e, slap_schema.si_ad_cn,
161                 (struct berval *)&slap_ldapsync_bv, NULL );
162
163         if ( context_csn ) {
164                 attr_merge_one( e, slap_schema.si_ad_contextCSN,
165                         context_csn, NULL );
166         }
167
168         BER_BVSTR( &bv, "{}" );
169         attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
170
171         build_new_dn( &e->e_name, &be->be_nsuffix[0],
172                 (struct berval *)&slap_ldapsync_cn_bv, NULL );
173         ber_dupbv( &e->e_nname, &e->e_name );
174
175         return e;
176 }
177
178 void
179 slap_queue_csn(
180         Operation *op,
181         struct berval *csn )
182 {
183         struct slap_csn_entry *pending;
184         BackendDB *be = op->o_bd->bd_self;
185
186         pending = (struct slap_csn_entry *) ch_calloc( 1,
187                         sizeof( struct slap_csn_entry ));
188
189         Debug( LDAP_DEBUG_SYNC, "slap_queue_csn: queing %p %s\n", csn->bv_val, csn->bv_val, 0 );
190
191         ber_dupbv( &pending->ce_csn, csn );
192         ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
193         pending->ce_sid = slap_parse_csn_sid( csn );
194         pending->ce_connid = op->o_connid;
195         pending->ce_opid = op->o_opid;
196         pending->ce_state = SLAP_CSN_PENDING;
197
198         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
199         LDAP_TAILQ_INSERT_TAIL( be->be_pending_csn_list,
200                 pending, ce_csn_link );
201         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
202 }
203
204 int
205 slap_get_csn(
206         Operation *op,
207         struct berval *csn,
208         int manage_ctxcsn )
209 {
210         if ( csn == NULL ) return LDAP_OTHER;
211
212         csn->bv_len = ldap_pvt_csnstr( csn->bv_val, csn->bv_len, slap_serverID, 0 );
213         if ( manage_ctxcsn )
214                 slap_queue_csn( op, csn );
215
216         return LDAP_SUCCESS;
217 }