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/* noopsrch.c - LDAP Control that counts entries a search would return */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2010-2024 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>.
*/
/* ACKNOWLEDGEMENTS:
* This work was initially developed by Pierangelo Masarati for inclusion
* in OpenLDAP Software.
*/
#include "portable.h"
/* define SLAPD_OVER_NOOPSRCH=2 to build as run-time loadable module */
#ifdef SLAPD_OVER_NOOPSRCH
/*
* Control OID
*/
#define LDAP_CONTROL_X_NOOPSRCH "1.3.6.1.4.1.4203.666.5.18"
#include "slap.h"
#include "ac/string.h"
#define o_noopsrch o_ctrlflag[noopsrch_cid]
#define o_ctrlnoopsrch o_controls[noopsrch_cid]
static int noopsrch_cid;
static slap_overinst noopsrch;
static int
noopsrch_parseCtrl (
Operation *op,
SlapReply *rs,
LDAPControl *ctrl )
{
if ( op->o_noopsrch != SLAP_CONTROL_NONE ) {
rs->sr_text = "No-op Search control specified multiple times";
return LDAP_PROTOCOL_ERROR;
}
if ( !BER_BVISNULL( &ctrl->ldctl_value ) ) {
rs->sr_text = "No-op Search control value is present";
return LDAP_PROTOCOL_ERROR;
}
op->o_ctrlnoopsrch = (void *)NULL;
op->o_noopsrch = ctrl->ldctl_iscritical
? SLAP_CONTROL_CRITICAL
: SLAP_CONTROL_NONCRITICAL;
rs->sr_err = LDAP_SUCCESS;
return rs->sr_err;
}
int dummy;
typedef struct noopsrch_cb_t {
slap_overinst *nc_on;
ber_int_t nc_nentries;
ber_int_t nc_nsearchref;
AttributeName *nc_save_attrs;
int *nc_pdummy;
int nc_save_slimit;
} noopsrch_cb_t;
static int
noopsrch_response( Operation *op, SlapReply *rs )
{
noopsrch_cb_t *nc = (noopsrch_cb_t *)op->o_callback->sc_private;
/* if the control is global, limits are not computed yet */
if ( nc->nc_pdummy == &dummy ) {
nc->nc_save_slimit = op->ors_slimit;
op->ors_slimit = SLAP_NO_LIMIT;
nc->nc_pdummy = NULL;
}
if ( rs->sr_type == REP_SEARCH ) {
nc->nc_nentries++;
#ifdef NOOPSRCH_DEBUG
Debug( LDAP_DEBUG_TRACE, "noopsrch_response(REP_SEARCH): nentries=%d\n", nc->nc_nentries );
#endif
return 0;
} else if ( rs->sr_type == REP_SEARCHREF ) {
nc->nc_nsearchref++;
return 0;
} else if ( rs->sr_type == REP_RESULT ) {
BerElementBuffer berbuf;
BerElement *ber = (BerElement *) &berbuf;
struct berval ctrlval;
LDAPControl *ctrl, *ctrlsp[2];
int rc = rs->sr_err;
if ( nc->nc_save_slimit >= 0 && nc->nc_nentries >= nc->nc_save_slimit ) {
rc = LDAP_SIZELIMIT_EXCEEDED;
}
#ifdef NOOPSRCH_DEBUG
Debug( LDAP_DEBUG_TRACE, "noopsrch_response(REP_RESULT): err=%d nentries=%d nref=%d\n", rc, nc->nc_nentries, nc->nc_nsearchref );
#endif
ber_init2( ber, NULL, LBER_USE_DER );
ber_printf( ber, "{iii}", rc, nc->nc_nentries, nc->nc_nsearchref );
if ( ber_flatten2( ber, &ctrlval, 0 ) == -1 ) {
ber_free_buf( ber );
if ( op->o_noopsrch == SLAP_CONTROL_CRITICAL ) {
return LDAP_CONSTRAINT_VIOLATION;
}
return SLAP_CB_CONTINUE;
}
ctrl = op->o_tmpcalloc( 1,
sizeof( LDAPControl ) + ctrlval.bv_len + 1,
op->o_tmpmemctx );
ctrl->ldctl_value.bv_val = (char *)&ctrl[ 1 ];
ctrl->ldctl_oid = LDAP_CONTROL_X_NOOPSRCH;
ctrl->ldctl_iscritical = 0;
ctrl->ldctl_value.bv_len = ctrlval.bv_len;
AC_MEMCPY( ctrl->ldctl_value.bv_val, ctrlval.bv_val, ctrlval.bv_len );
ctrl->ldctl_value.bv_val[ ctrl->ldctl_value.bv_len ] = '\0';
ber_free_buf( ber );
ctrlsp[0] = ctrl;
ctrlsp[1] = NULL;
slap_add_ctrls( op, rs, ctrlsp );
}
return SLAP_CB_CONTINUE;
}
static int
noopsrch_cleanup( Operation *op, SlapReply *rs )
{
if ( rs->sr_type == REP_RESULT || rs->sr_err == SLAPD_ABANDON ) {
noopsrch_cb_t *nc = (noopsrch_cb_t *)op->o_callback->sc_private;
op->ors_attrs = nc->nc_save_attrs;
if ( nc->nc_pdummy == NULL ) {
op->ors_slimit = nc->nc_save_slimit;
}
op->o_tmpfree( op->o_callback, op->o_tmpmemctx );
op->o_callback = NULL;
}
return SLAP_CB_CONTINUE;
}
static int
noopsrch_op_search( Operation *op, SlapReply *rs )
{
if ( op->o_noopsrch != SLAP_CONTROL_NONE ) {
slap_callback *sc;
noopsrch_cb_t *nc;
sc = op->o_tmpcalloc( 1, sizeof( slap_callback ) + sizeof( noopsrch_cb_t ), op->o_tmpmemctx );
nc = (noopsrch_cb_t *)&sc[ 1 ];
nc->nc_on = (slap_overinst *)op->o_bd->bd_info;
nc->nc_nentries = 0;
nc->nc_nsearchref = 0;
nc->nc_save_attrs = op->ors_attrs;
nc->nc_pdummy = &dummy;
sc->sc_response = noopsrch_response;
sc->sc_cleanup = noopsrch_cleanup;
sc->sc_private = (void *)nc;
op->ors_attrs = slap_anlist_no_attrs;
sc->sc_next = op->o_callback->sc_next;
op->o_callback->sc_next = sc;
}
return SLAP_CB_CONTINUE;
}
static int noopsrch_cnt;
static int
noopsrch_db_init( BackendDB *be, ConfigReply *cr)
{
if ( noopsrch_cnt++ == 0 ) {
int rc;
rc = register_supported_control( LDAP_CONTROL_X_NOOPSRCH,
SLAP_CTRL_SEARCH | SLAP_CTRL_GLOBAL_SEARCH, NULL,
noopsrch_parseCtrl, &noopsrch_cid );
if ( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_ANY,
"noopsrch_initialize: Failed to register control '%s' (%d)\n",
LDAP_CONTROL_X_NOOPSRCH, rc );
return rc;
}
}
return LDAP_SUCCESS;
}
static int
noopsrch_db_destroy( BackendDB *be, ConfigReply *cr )
{
assert( noopsrch_cnt > 0 );
#ifdef SLAP_CONFIG_DELETE
overlay_unregister_control( be, LDAP_CONTROL_X_NOOPSRCH );
if ( --noopsrch_cnt == 0 ) {
unregister_supported_control( LDAP_CONTROL_X_NOOPSRCH );
}
#endif /* SLAP_CONFIG_DELETE */
return 0;
}
#if SLAPD_OVER_NOOPSRCH == SLAPD_MOD_DYNAMIC
static
#endif /* SLAPD_OVER_NOOPSRCH == SLAPD_MOD_DYNAMIC */
int
noopsrch_initialize( void )
{
noopsrch.on_bi.bi_type = "noopsrch";
noopsrch.on_bi.bi_flags = SLAPO_BFLAG_SINGLE;
noopsrch.on_bi.bi_db_init = noopsrch_db_init;
noopsrch.on_bi.bi_db_destroy = noopsrch_db_destroy;
noopsrch.on_bi.bi_op_search = noopsrch_op_search;
return overlay_register( &noopsrch );
}
#if SLAPD_OVER_NOOPSRCH == SLAPD_MOD_DYNAMIC
int
init_module( int argc, char *argv[] )
{
return noopsrch_initialize();
}
#endif /* SLAPD_OVER_NOOPSRCH == SLAPD_MOD_DYNAMIC */
#endif /* SLAPD_OVER_NOOPSRCH */
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