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/* cancel.c - LDAP cancel extended operation */
/* $OpenLDAP$ */
/* 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>.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/unistd.h>
#include "slap.h"
#include <lber_pvt.h>
#include <lutil.h>
const struct berval slap_EXOP_CANCEL = BER_BVC(LDAP_EXOP_CANCEL);
int cancel_extop( Operation *op, SlapReply *rs )
{
Operation *o;
int rc;
int opid;
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
assert( ber_bvcmp( &slap_EXOP_CANCEL, &op->ore_reqoid ) == 0 );
if ( op->ore_reqdata == NULL ) {
rs->sr_text = "no message ID supplied";
return LDAP_PROTOCOL_ERROR;
}
if ( op->ore_reqdata->bv_len == 0 ) {
rs->sr_text = "empty request data field";
return LDAP_PROTOCOL_ERROR;
}
/* ber_init2 uses reqdata directly, doesn't allocate new buffers */
ber_init2( ber, op->ore_reqdata, 0 );
if ( ber_scanf( ber, "{i}", &opid ) == LBER_ERROR ) {
rs->sr_text = "message ID parse failed";
return LDAP_PROTOCOL_ERROR;
}
Statslog( LDAP_DEBUG_STATS, "%s CANCEL msg=%d\n",
op->o_log_prefix, opid, 0, 0, 0 );
if ( opid < 0 ) {
rs->sr_text = "message ID invalid";
return LDAP_PROTOCOL_ERROR;
}
if ( opid == op->o_msgid ) {
op->o_cancel = SLAP_CANCEL_DONE;
return LDAP_SUCCESS;
}
ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
if ( op->o_abandon ) {
/* FIXME: Should instead reject the cancel/abandon of this op, but
* it seems unsafe to reset op->o_abandon once it is set. ITS#6138.
*/
rc = LDAP_OPERATIONS_ERROR;
rs->sr_text = "tried to abandon or cancel this operation";
goto out;
}
LDAP_STAILQ_FOREACH( o, &op->o_conn->c_pending_ops, o_next ) {
if ( o->o_msgid == opid ) {
/* TODO: We could instead remove the cancelled operation
* from c_pending_ops like Abandon does, and send its
* response here. Not if it is pending because of a
* congested connection though.
*/
rc = LDAP_CANNOT_CANCEL;
rs->sr_text = "too busy for Cancel, try Abandon instead";
goto out;
}
}
LDAP_STAILQ_FOREACH( o, &op->o_conn->c_ops, o_next ) {
if ( o->o_msgid == opid ) {
break;
}
}
if ( o == NULL ) {
rc = LDAP_NO_SUCH_OPERATION;
rs->sr_text = "message ID not found";
} else if ( o->o_tag == LDAP_REQ_BIND
|| o->o_tag == LDAP_REQ_UNBIND
|| o->o_tag == LDAP_REQ_ABANDON ) {
rc = LDAP_CANNOT_CANCEL;
} else if ( o->o_cancel != SLAP_CANCEL_NONE ) {
rc = LDAP_OPERATIONS_ERROR;
rs->sr_text = "message ID already being cancelled";
#if 0
} else if ( o->o_abandon ) {
/* TODO: Would this break something when
* o_abandon="suppress response"? (ITS#6138)
*/
rc = LDAP_TOO_LATE;
#endif
} else {
rc = LDAP_SUCCESS;
o->o_cancel = SLAP_CANCEL_REQ;
o->o_abandon = 1;
}
out:
ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
if ( rc == LDAP_SUCCESS ) {
LDAP_STAILQ_FOREACH( op->o_bd, &backendDB, be_next ) {
if( !op->o_bd->be_cancel ) continue;
op->oq_cancel.rs_msgid = opid;
if ( op->o_bd->be_cancel( op, rs ) == LDAP_SUCCESS ) {
return LDAP_SUCCESS;
}
}
do {
/* Fake a cond_wait with thread_yield, then
* verify the result properly mutex-protected.
*/
while ( o->o_cancel == SLAP_CANCEL_REQ )
ldap_pvt_thread_yield();
ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
rc = o->o_cancel;
ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
} while ( rc == SLAP_CANCEL_REQ );
if ( rc == SLAP_CANCEL_ACK ) {
rc = LDAP_SUCCESS;
}
o->o_cancel = SLAP_CANCEL_DONE;
}
return rc;
}
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