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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed 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 tests.net;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
/**
* A test ServerSocket that you can't connect to --- connects will time out.
*/
public final class StuckServer {
private static final boolean DEBUG = false;
private ServerSocket serverSocket;
private InetSocketAddress address;
private ArrayList<Socket> clients = new ArrayList<Socket>();
public StuckServer(boolean useBacklog) throws IOException {
// Set a backlog and use it up so that we can expect the
// connection to time out. According to Stevens
// 4.5 "listen function", Linux adds 3 to the specified
// backlog, so we need to connect 4 times before it will hang.
// The trouble with this is that it won't hang forever.
// After 10s or so, the kernel allows a couple more connections.
// This mode is ony useful if you actually want to continue eventually; we use it to
// test non-blocking connects, for example, where you want to test every part of the code.
if (useBacklog) {
this.serverSocket = new ServerSocket(0, 1);
this.address = (InetSocketAddress) serverSocket.getLocalSocketAddress();
if (DEBUG) {
System.err.println("StuckServer: " + serverSocket);
}
for (int i = 0; i < 4; ++i) {
Socket client = new Socket(serverSocket.getInetAddress(), serverSocket.getLocalPort());
clients.add(client);
if (DEBUG) {
System.err.println("StuckServer client " + i + " - " + client);
}
}
} else {
// In general, though, you don't want to rely on listen(2) backlog. http://b/6971145.
// RFC 5737 implies this network will be unreachable. (There are two other networks
// to try if we have trouble with this one.)
// We've had trouble with 10.* in the past (because test labs running CTS often use
// net 10!) but hopefully this network will be better.
InetAddress testNet1 = InetAddress.getByAddress(new byte[] { (byte) 192, 0, 2, 0 });
this.address = new InetSocketAddress(testNet1, 80);
}
}
public InetSocketAddress getLocalSocketAddress() {
return address;
}
public int getLocalPort() {
return address.getPort();
}
public void close() throws IOException {
if (serverSocket != null) {
serverSocket.close();
}
for (Socket client : clients) {
client.close();
}
}
}
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