/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.sun.jini.phoenix;
import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.rmi.server.ServerNotActiveException;
import java.security.AccessControlException;
import java.util.HashMap;
import java.util.Map;
import net.jini.export.ServerContext;
import net.jini.io.context.ClientHost;
/**
* Definition of an access control only allowing calls from the local host.
*
* @author Sun Microsystems, Inc.
*
* @since 2.0
*/
class LocalAccess {
private static Map cache = new HashMap(3);
private LocalAccess() {
}
/**
* Checks whether a call was made by a local host.
* Specifically, this means that if, in the dispatched call,
* there is a ServerContext and it contains an element
* that is an instance of ClientHost, then if the InetAddress
* returned by ClientHost.getClientHost is not a local
* network interface (according to NetworkInterface.getByInetAddress)
* or not a loopback address
* (according to NetworkInterface.isLoopBackAddress),
* the call will be rejected; in all other cases,
* the call will be accepted.
*
* @throws AccessControlException when the origin is not a local host
*/
public static synchronized void check() {
ClientHost host = null;
try {
host = (ClientHost)
ServerContext.getServerContextElement(ClientHost.class);
} catch (ServerNotActiveException e) {
return;
}
if (host == null) return;
InetAddress addr = host.getClientHost();
Boolean ok = (Boolean) cache.get(addr);
if (ok == null) {
try {
ok = Boolean.valueOf(addr != null && (NetworkInterface.getByInetAddress(
addr) != null || addr.isLoopbackAddress()));
} catch (IOException e) {
ok = Boolean.FALSE;
}
cache.put(addr, ok);
}
if (!ok.booleanValue()) {
throw new AccessControlException("origin is non-local host");
}
}
}