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-rw-r--r--libraries/libldap/compare.c197
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diff --git a/libraries/libldap/compare.c b/libraries/libldap/compare.c
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* Portions Copyright (c) 1990 Regents of the University of Michigan.
+ * All rights reserved.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/socket.h>
+#include <ac/string.h>
+#include <ac/time.h>
+
+#include "ldap-int.h"
+#include "ldap_log.h"
+
+/* The compare request looks like this:
+ * CompareRequest ::= SEQUENCE {
+ * entry DistinguishedName,
+ * ava SEQUENCE {
+ * type AttributeType,
+ * value AttributeValue
+ * }
+ * }
+ */
+
+BerElement *
+ldap_build_compare_req(
+ LDAP *ld,
+ LDAP_CONST char *dn,
+ LDAP_CONST char *attr,
+ struct berval *bvalue,
+ LDAPControl **sctrls,
+ LDAPControl **cctrls,
+ int *msgidp )
+{
+ BerElement *ber;
+ int rc;
+
+ /* create a message to send */
+ if ( (ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
+ return( NULL );
+ }
+
+ LDAP_NEXT_MSGID(ld, *msgidp);
+ rc = ber_printf( ber, "{it{s{sON}N}", /* '}' */
+ *msgidp,
+ LDAP_REQ_COMPARE, dn, attr, bvalue );
+ if ( rc == -1 )
+ {
+ ld->ld_errno = LDAP_ENCODING_ERROR;
+ ber_free( ber, 1 );
+ return( NULL );
+ }
+
+ /* Put Server Controls */
+ if( ldap_int_put_controls( ld, sctrls, ber ) != LDAP_SUCCESS ) {
+ ber_free( ber, 1 );
+ return( NULL );
+ }
+
+ if( ber_printf( ber, /*{*/ "N}" ) == -1 ) {
+ ld->ld_errno = LDAP_ENCODING_ERROR;
+ ber_free( ber, 1 );
+ return( NULL );
+ }
+
+ return( ber );
+}
+
+/*
+ * ldap_compare_ext - perform an ldap extended compare operation. The dn
+ * of the entry to compare to and the attribute and value to compare (in
+ * attr and value) are supplied. The msgid of the response is returned.
+ *
+ * Example:
+ * struct berval bvalue = { "secret", sizeof("secret")-1 };
+ * rc = ldap_compare( ld, "c=us@cn=bob",
+ * "userPassword", &bvalue,
+ * sctrl, cctrl, &msgid )
+ */
+int
+ldap_compare_ext(
+ LDAP *ld,
+ LDAP_CONST char *dn,
+ LDAP_CONST char *attr,
+ struct berval *bvalue,
+ LDAPControl **sctrls,
+ LDAPControl **cctrls,
+ int *msgidp )
+{
+ int rc;
+ BerElement *ber;
+ ber_int_t id;
+
+ Debug( LDAP_DEBUG_TRACE, "ldap_compare\n", 0, 0, 0 );
+
+ assert( ld != NULL );
+ assert( LDAP_VALID( ld ) );
+ assert( dn != NULL );
+ assert( attr != NULL );
+ assert( msgidp != NULL );
+
+ /* check client controls */
+ rc = ldap_int_client_controls( ld, cctrls );
+ if( rc != LDAP_SUCCESS ) return rc;
+
+ ber = ldap_build_compare_req(
+ ld, dn, attr, bvalue, sctrls, cctrls, &id );
+ if( !ber )
+ return ld->ld_errno;
+
+ /* send the message */
+ *msgidp = ldap_send_initial_request( ld, LDAP_REQ_COMPARE, dn, ber, id );
+ return ( *msgidp < 0 ? ld->ld_errno : LDAP_SUCCESS );
+}
+
+/*
+ * ldap_compare_ext - perform an ldap extended compare operation. The dn
+ * of the entry to compare to and the attribute and value to compare (in
+ * attr and value) are supplied. The msgid of the response is returned.
+ *
+ * Example:
+ * msgid = ldap_compare( ld, "c=us@cn=bob", "userPassword", "secret" )
+ */
+int
+ldap_compare(
+ LDAP *ld,
+ LDAP_CONST char *dn,
+ LDAP_CONST char *attr,
+ LDAP_CONST char *value )
+{
+ int msgid;
+ struct berval bvalue;
+
+ assert( value != NULL );
+
+ bvalue.bv_val = (char *) value;
+ bvalue.bv_len = (value == NULL) ? 0 : strlen( value );
+
+ return ldap_compare_ext( ld, dn, attr, &bvalue, NULL, NULL, &msgid ) == LDAP_SUCCESS
+ ? msgid : -1;
+}
+
+int
+ldap_compare_ext_s(
+ LDAP *ld,
+ LDAP_CONST char *dn,
+ LDAP_CONST char *attr,
+ struct berval *bvalue,
+ LDAPControl **sctrl,
+ LDAPControl **cctrl )
+{
+ int rc;
+ int msgid;
+ LDAPMessage *res;
+
+ rc = ldap_compare_ext( ld, dn, attr, bvalue, sctrl, cctrl, &msgid );
+
+ if ( rc != LDAP_SUCCESS )
+ return( rc );
+
+ if ( ldap_result( ld, msgid, LDAP_MSG_ALL, (struct timeval *) NULL, &res ) == -1 || !res )
+ return( ld->ld_errno );
+
+ return( ldap_result2error( ld, res, 1 ) );
+}
+
+int
+ldap_compare_s(
+ LDAP *ld,
+ LDAP_CONST char *dn,
+ LDAP_CONST char *attr,
+ LDAP_CONST char *value )
+{
+ struct berval bvalue;
+
+ assert( value != NULL );
+
+ bvalue.bv_val = (char *) value;
+ bvalue.bv_len = (value == NULL) ? 0 : strlen( value );
+
+ return ldap_compare_ext_s( ld, dn, attr, &bvalue, NULL, NULL );
+}