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/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @requires (os.family == "linux" | os.family == "mac")
* @bug 8203937
* @summary Test reading bytes from a socket after the connection has been
* reset by the peer
*/
import java.io.IOException;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
* This test exercises platform specific and unspecified behavior. It exists
* only to ensure that the behavior doesn't change between JDK releases.
*/
public class ReadAfterReset {
private static final PrintStream out = System.out;
// number of bytes to write before the connection reset
private static final int NUM_BYTES_TO_WRITE = 1000;
public static void main(String[] args) throws IOException {
try (ServerSocket ss = new ServerSocket()) {
ss.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
/**
* Connect to the server which will write some bytes and reset the
* connection. The client then attempts to read the bytes sent by
* the server before it closed the connection.
*/
out.println("Test connection ...");
try (Socket s = new Socket()) {
s.connect(ss.getLocalSocketAddress());
int nwrote = acceptAndResetConnection(ss);
int nread = readUntilIOException(s);
if (nread != nwrote) {
throw new RuntimeException("Client read " + nread + ", expected " + nwrote);
}
}
/**
* Connect to the server which will write some bytes and reset the
* connection. The client then writes to its end of the connection,
* failing as the connection is reset. It then attempts to read the
* bytes sent by the server before it closed the connection.
*/
out.println();
out.println("Test connection ...");
try (Socket s = new Socket()) {
s.connect(ss.getLocalSocketAddress());
int nwrote = acceptAndResetConnection(ss);
writeUntilIOException(s);
int nread = readUntilIOException(s);
if (nread != nwrote) {
throw new RuntimeException("Client read " + nread + ", expected " + nwrote);
}
}
}
}
/**
* Accept a connection, write bytes, and then reset the connection
*/
static int acceptAndResetConnection(ServerSocket ss) throws IOException {
int count = NUM_BYTES_TO_WRITE;
try (Socket peer = ss.accept()) {
peer.getOutputStream().write(new byte[count]);
peer.setSoLinger(true, 0);
out.format("Server wrote %d bytes and reset connection%n", count);
}
return count;
}
/**
* Write bytes to a socket until I/O exception is thrown
*/
static void writeUntilIOException(Socket s) {
try {
byte[] bytes = new byte[100];
while (true) {
s.getOutputStream().write(bytes);
out.format("Client wrote %d bytes%n", bytes.length);
}
} catch (IOException ioe) {
out.format("Client write failed: %s (expected)%n", ioe);
}
}
/**
* Read bytes from a socket until I/O exception is thrown.
*
* @return the number of bytes read before the I/O exception was thrown
*/
static int readUntilIOException(Socket s) {
int nread = 0;
try {
byte[] bytes = new byte[100];
while (true) {
int n = s.getInputStream().read(bytes);
if (n < 0) {
out.println("Client read EOF");
break;
} else {
out.format("Client read %s bytes%n", n);
nread += n;
}
}
} catch (IOException ioe) {
out.format("Client read failed: %s (expected)%n", ioe);
}
return nread;
}
}
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