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A toy/demo overlay for collective attributes.
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Howard Chu
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a576085200
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be16224b03
170
servers/slapd/overlays/collect.c
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170
servers/slapd/overlays/collect.c
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/* collect.c - Demonstration of overlay code */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 2003-2004 The OpenLDAP Foundation.
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* Portions Copyright 2003 Howard Chu.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* ACKNOWLEDGEMENTS:
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* This work was initially developed by the Howard Chu for inclusion
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* in OpenLDAP Software.
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*/
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#include "portable.h"
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#ifdef SLAPD_OVER_COLLECT
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#include <stdio.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#include "slap.h"
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/* This is a cheap hack to implement a collective attribute.
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*
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* This demonstration overlay looks for a specified attribute in an
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* ancestor of a given entry and adds that attribute to the given
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* entry when it is returned in a search response. It takes no effect
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* for any other operations. If the ancestor does not exist, there
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* is no effect. If no attribute was configured, there is no effect.
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*/
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typedef struct collect_info {
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struct collect_info *ci_next;
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struct berval ci_dn;
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AttributeDescription *ci_ad;
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} collect_info;
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static int
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collect_response( Operation *op, SlapReply *rs )
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{
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slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
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collect_info *ci = on->on_bi.bi_private;
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/* If we've been configured and the current response is
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* a search entry
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*/
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if ( ci && rs->sr_type == REP_SEARCH ) {
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Entry *new = NULL;
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int rc;
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op->o_bd->bd_info = (BackendInfo *)on->on_info;
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for (; ci; ci=ci->ci_next ) {
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BerVarray vals = NULL;
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/* Is our configured entry an ancestor of this one? */
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rc = rs->sr_entry->e_nname.bv_len - ci->ci_dn.bv_len;
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if ( rc < 1 || strcmp( rs->sr_entry->e_nname.bv_val + rc,
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ci->ci_dn.bv_val )) continue;
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/* Extract the values of the desired attribute from
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* the ancestor entry
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*/
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rc = backend_attribute( op, NULL, &ci->ci_dn, ci->ci_ad, &vals );
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/* If there are any values, merge them into the
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* current entry
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*/
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if ( vals ) {
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/* The current entry may live in a cache, so
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* don't modify it directly. Make a copy and
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* work with that instead.
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*/
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if ( !new ) {
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new = entry_dup( rs->sr_entry );
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}
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attr_merge( new, ci->ci_ad, vals, NULL );
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ber_bvarray_free_x( vals, op->o_tmpmemctx );
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}
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}
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if ( new ) {
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rs->sr_entry = new;
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rs->sr_flags |= REP_ENTRY_MUSTBEFREED;
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}
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}
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/* Default is to just fall through to the normal processing */
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return SLAP_CB_CONTINUE;
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}
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static int collect_config(
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BackendDB *be,
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const char *fname,
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int lineno,
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int argc,
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char **argv
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)
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{
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slap_overinst *on = (slap_overinst *) be->bd_info;
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AttributeDescription *ad = NULL;
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/* The config syntax is "collectinfo <dn> <attribute-description>"
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* and only one directive may be specified per overlay instance.
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*/
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if ( strcasecmp( argv[0], "collectinfo" ) == 0 ) {
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collect_info *ci;
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struct berval bv, dn;
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const char *text;
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if ( argc != 3 ) {
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Debug( LDAP_DEBUG_ANY,
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"%s: line %d: argument missing in \"collectinfo <dn> <attribute-description>\" line.\n",
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fname, lineno, 0 );
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return( 1 );
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}
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ber_str2bv( argv[1], 0, 0, &bv );
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if ( dnNormalize( 0, NULL, NULL, &bv, &dn, NULL ) ) {
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Debug( LDAP_DEBUG_ANY,
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"%s: line %d: invalid DN in \"collectinfo\" line: %s.\n",
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fname, lineno, text );
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return( 1 );
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}
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if ( slap_str2ad( argv[2], &ad, &text ) ) {
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Debug( LDAP_DEBUG_ANY,
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"%s: line %d: attribute description unknown in \"collectinfo\" line: %s.\n",
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fname, lineno, text );
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return( 1 );
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}
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/* The on->on_bi.bi_private pointer can be used for
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* anything this instance of the overlay needs.
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*/
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ci = ch_malloc( sizeof( collect_info ));
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ci->ci_ad = ad;
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ci->ci_dn = dn;
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ci->ci_next = on->on_bi.bi_private;
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on->on_bi.bi_private = ci;
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return 0;
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}
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return SLAP_CONF_UNKNOWN;
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}
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static slap_overinst collect;
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int collect_init() {
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collect.on_bi.bi_type = "collect";
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collect.on_bi.bi_db_config = collect_config;
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collect.on_response = collect_response;
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return overlay_register( &collect );
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}
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#if SLAPD_OVER_COLLECT == SLAPD_MOD_DYNAMIC
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int init_module(int argc, char *argv[]) {
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return collect_init();
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}
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#endif
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#endif /* SLAPD_OVER_COLLECT */
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