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+/* compare.c - shell backend compare function */
+/* $OpenLDAP$ */
+/* 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) 1995 Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of Michigan at Ann Arbor. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific prior written permission. This software
+ * is provided ``as is'' without express or implied warranty.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was originally developed by the University of Michigan
+ * (as part of U-MICH LDAP).
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/string.h>
+#include <ac/socket.h>
+
+#include "slap.h"
+#include "shell.h"
+
+int
+shell_back_compare(
+ Operation *op,
+ SlapReply *rs )
+{
+ struct shellinfo *si = (struct shellinfo *) op->o_bd->be_private;
+ AttributeDescription *entry = slap_schema.si_ad_entry;
+ Entry e;
+ FILE *rfp, *wfp;
+
+ if ( si->si_compare == NULL ) {
+ send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
+ "compare not implemented" );
+ return( -1 );
+ }
+
+ e.e_id = NOID;
+ e.e_name = op->o_req_dn;
+ e.e_nname = op->o_req_ndn;
+ e.e_attrs = NULL;
+ e.e_ocflags = 0;
+ e.e_bv.bv_len = 0;
+ e.e_bv.bv_val = NULL;
+ e.e_private = NULL;
+
+ if ( ! access_allowed( op, &e,
+ entry, NULL, ACL_READ, NULL ) )
+ {
+ send_ldap_error( op, rs, LDAP_INSUFFICIENT_ACCESS, NULL );
+ return -1;
+ }
+
+ if ( forkandexec( si->si_compare, &rfp, &wfp ) == (pid_t)-1 ) {
+ send_ldap_error( op, rs, LDAP_OTHER,
+ "could not fork/exec" );
+ return( -1 );
+ }
+
+ /*
+ * FIX ME: This should use LDIF routines so that binary
+ * values are properly dealt with
+ */
+
+ /* write out the request to the compare process */
+ fprintf( wfp, "COMPARE\n" );
+ fprintf( wfp, "msgid: %ld\n", (long) op->o_msgid );
+ print_suffixes( wfp, op->o_bd );
+ fprintf( wfp, "dn: %s\n", op->o_req_dn.bv_val );
+ fprintf( wfp, "%s: %s\n",
+ op->oq_compare.rs_ava->aa_desc->ad_cname.bv_val,
+ op->oq_compare.rs_ava->aa_value.bv_val /* could be binary! */ );
+ fclose( wfp );
+
+ /* read in the result and send it along */
+ read_and_send_results( op, rs, rfp );
+
+ fclose( rfp );
+ return( 0 );
+}