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[openldap] / servers / slapd / back-ldap / compare.c
1 /* compare.c - ldap backend compare function */
2 /* $OpenLDAP$ */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4  *
5  * Copyright 2003-2011 The OpenLDAP Foundation.
6  * Portions Copyright 1999-2003 Howard Chu.
7  * Portions Copyright 2000-2003 Pierangelo Masarati.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted only as authorized by the OpenLDAP
12  * Public License.
13  *
14  * A copy of this license is available in the file LICENSE in the
15  * top-level directory of the distribution or, alternatively, at
16  * <http://www.OpenLDAP.org/license.html>.
17  */
18 /* ACKNOWLEDGEMENTS:
19  * This work was initially developed by the Howard Chu for inclusion
20  * in OpenLDAP Software and subsequently enhanced by Pierangelo
21  * Masarati.
22  */
23
24 #include "portable.h"
25
26 #include <stdio.h>
27
28 #include <ac/string.h>
29 #include <ac/socket.h>
30
31 #include "slap.h"
32 #include "back-ldap.h"
33
34 int
35 ldap_back_compare(
36                 Operation       *op,
37                 SlapReply       *rs )
38 {
39         ldapinfo_t              *li = (ldapinfo_t *)op->o_bd->be_private;
40
41         ldapconn_t              *lc = NULL;
42         ber_int_t               msgid;
43         ldap_back_send_t        retrying = LDAP_BACK_RETRYING;
44         LDAPControl             **ctrls = NULL;
45         int                     rc = LDAP_SUCCESS;
46
47         if ( !ldap_back_dobind( &lc, op, rs, LDAP_BACK_SENDERR ) ) {
48                 lc = NULL;
49                 goto cleanup;
50         }
51
52 retry:
53         ctrls = op->o_ctrls;
54         rc = ldap_back_controls_add( op, rs, lc, &ctrls );
55         if ( rc != LDAP_SUCCESS ) {
56                 send_ldap_result( op, rs );
57                 goto cleanup;
58         }
59
60         rs->sr_err = ldap_compare_ext( lc->lc_ld, op->o_req_dn.bv_val,
61                         op->orc_ava->aa_desc->ad_cname.bv_val,
62                         &op->orc_ava->aa_value, 
63                         ctrls, NULL, &msgid );
64         rc = ldap_back_op_result( lc, op, rs, msgid,
65                 li->li_timeout[ SLAP_OP_COMPARE ],
66                 ( LDAP_BACK_SENDRESULT | retrying ) );
67         if ( rc == LDAP_UNAVAILABLE && retrying ) {
68                 retrying &= ~LDAP_BACK_RETRYING;
69                 if ( ldap_back_retry( &lc, op, rs, LDAP_BACK_SENDERR ) ) {
70                         /* if the identity changed, there might be need to re-authz */
71                         (void)ldap_back_controls_free( op, rs, &ctrls );
72                         goto retry;
73                 }
74         }
75
76 cleanup:
77         (void)ldap_back_controls_free( op, rs, &ctrls );
78         
79         if ( lc != NULL ) {
80                 ldap_back_release_conn( li, lc );
81         }
82
83         return rs->sr_err;
84 }