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/*
* Copyright (c) 2019, 2021, 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
* @run testng ConnectionReset
* @summary Test behavior of read and available when a connection is reset
*/
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
@Test
public class ConnectionReset {
static final int REPEAT_COUNT = 5;
/**
* Tests available before read when there are no bytes to read
*/
public void testAvailableBeforeRead1() throws IOException {
System.out.println("testAvailableBeforeRead1");
withResetConnection(null, s -> {
InputStream in = s.getInputStream();
for (int i=0; i<REPEAT_COUNT; i++) {
int bytesAvailable = in.available();
System.out.format("available => %d%n", bytesAvailable);
assertTrue(bytesAvailable == 0);
try {
int bytesRead = in.read();
if (bytesRead == -1) {
System.out.println("read => EOF");
} else {
System.out.println("read => 1 byte");
}
assertTrue(false);
} catch (IOException ioe) {
System.out.format("read => %s (expected)%n", ioe);
}
}
});
}
/**
* Tests available before read when there are bytes to read
*/
public void testAvailableBeforeRead2() throws IOException {
System.out.println("testAvailableBeforeRead2");
byte[] data = { 1, 2, 3 };
withResetConnection(data, s -> {
InputStream in = s.getInputStream();
int remaining = data.length;
for (int i=0; i<REPEAT_COUNT; i++) {
int bytesAvailable = in.available();
System.out.format("available => %d%n", bytesAvailable);
assertTrue(bytesAvailable <= remaining);
try {
int bytesRead = in.read();
if (bytesRead == -1) {
System.out.println("read => EOF");
assertTrue(false);
} else {
System.out.println("read => 1 byte");
assertTrue(remaining > 0);
remaining--;
}
} catch (IOException ioe) {
System.out.format("read => %s%n", ioe);
remaining = 0;
}
}
});
}
/**
* Tests read before available when there are no bytes to read
*/
public void testReadBeforeAvailable1() throws IOException {
System.out.println("testReadBeforeAvailable1");
withResetConnection(null, s -> {
InputStream in = s.getInputStream();
for (int i=0; i<REPEAT_COUNT; i++) {
try {
int bytesRead = in.read();
if (bytesRead == -1) {
System.out.println("read => EOF");
} else {
System.out.println("read => 1 byte");
}
assertTrue(false);
} catch (IOException ioe) {
System.out.format("read => %s (expected)%n", ioe);
}
int bytesAvailable = in.available();
System.out.format("available => %d%n", bytesAvailable);
assertTrue(bytesAvailable == 0);
}
});
}
/**
* Tests read before available when there are bytes to read
*/
public void testReadBeforeAvailable2() throws IOException {
System.out.println("testReadBeforeAvailable2");
byte[] data = { 1, 2, 3 };
withResetConnection(data, s -> {
InputStream in = s.getInputStream();
int remaining = data.length;
for (int i=0; i<REPEAT_COUNT; i++) {
try {
int bytesRead = in.read();
if (bytesRead == -1) {
System.out.println("read => EOF");
assertTrue(false);
} else {
System.out.println("read => 1 byte");
assertTrue(remaining > 0);
remaining--;
}
} catch (IOException ioe) {
System.out.format("read => %s%n", ioe);
remaining = 0;
}
int bytesAvailable = in.available();
System.out.format("available => %d%n", bytesAvailable);
assertTrue(bytesAvailable <= remaining);
}
});
}
/**
* Tests available and read on a socket closed after connection reset
*/
public void testAfterClose() throws IOException {
System.out.println("testAfterClose");
withResetConnection(null, s -> {
InputStream in = s.getInputStream();
try {
in.read();
assertTrue(false);
} catch (IOException ioe) {
// expected
}
s.close();
try {
int bytesAvailable = in.available();
System.out.format("available => %d%n", bytesAvailable);
assertTrue(false);
} catch (IOException ioe) {
System.out.format("available => %s (expected)%n", ioe);
}
try {
int n = in.read();
System.out.format("read => %d%n", n);
assertTrue(false);
} catch (IOException ioe) {
System.out.format("read => %s (expected)%n", ioe);
}
});
}
interface ThrowingConsumer<T> {
void accept(T t) throws IOException;
}
/**
* Invokes a consumer with a Socket connected to a peer that has closed the
* connection with a "connection reset". The peer sends the given data bytes
* before closing (when data is not null).
*/
static void withResetConnection(byte[] data, ThrowingConsumer<Socket> consumer)
throws IOException
{
var loopback = InetAddress.getLoopbackAddress();
try (var listener = new ServerSocket()) {
listener.bind(new InetSocketAddress(loopback, 0));
try (var socket = new Socket()) {
socket.connect(listener.getLocalSocketAddress());
try (Socket peer = listener.accept()) {
if (data != null) {
peer.getOutputStream().write(data);
}
peer.setSoLinger(true, 0);
}
consumer.accept(socket);
}
}
}
}
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