java.net.InetAddress.getLocalHost() returns wrong host name for loopback
address
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Key: HARMONY-73
URL: http://issues.apache.org/jira/browse/HARMONY-73
Project: Harmony
Type: Bug
Components: Classlib
Reporter: Svetlana Samoilenko
Priority: Minor
J2se 1.4.2 and 5.0 specifications for java.net.InetAddress.getLocalHost() read,
that if there is a security manager, its checkConnect method is called with the
local host name and -1 as its arguments to see if the operation is allowed.
If the operation is not allowed, an InetAddress representing the loopback
address is returned as hostname/hostaddress (as followed from toString()
specification).
The test listed below shows that the returned loopback address has wrong
hostname, "127.0.0.1" instead of "loopback".
Inet_SecurityManager class is called twice and therefore host name is
substituted with hostaddress address.
Code to reproduce:
import java.net.*;
public class test2 {
public static void main(String[] args) {
try {
System.setSecurityManager(new Inet_SecurityManager());
System.out.println("Loopback address = " +
InetAddress.getLocalHost());
} catch (Exception e){
System.out.println("Unexpected exception = " + e);
};
}
}
class Inet_SecurityManager extends SecurityManager {
public void checkConnect(String host, int port) {
super.checkConnect(host,port);
throw new SecurityException();
}
}
Steps to Reproduce:
1. Build Harmony (check-out on 2006-01-30) j2se subset as described in
README.txt.
2. Compile test2.java using BEA 1.4 javac
> javac -d . test2.java
3. Run java using compatible VM (J9)
> java -showversion test2
Output:
C:\tmp>C:\jrockit-j2sdk1.4.2_04\bin\java.exe -showversion test2
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
BEA WebLogic JRockit(TM) 1.4.2_04 JVM (build ari-31788-20040616-1132-win-ia32,
Native Threads, GC strategy: parallel)
Inet_SecurityManager :host= nswssamoil1
Inet_SecurityManager :port= -1
Loopback address = localhost/127.0.0.1
C:\tmp>C:\harmony\trunk\deploy\jre\bin\java -showversion test2
(c) Copyright 1991, 2005 The Apache Software Foundation or its licensors, as
applicable.
Inet_SecurityManager :host= nswssamoil1
Inet_SecurityManager :port= -1
Inet_SecurityManager :host= localhost
Inet_SecurityManager :port= -1
Loopback address = 127.0.0.1/127.0.0.1
Suggested junit test case:
------------------------ InetAddressTest.java
-------------------------------------------------
import java.net.*;
import junit.framework.*;
public class InetAddressTest extends TestCase {
public static void main(String[] args) {
junit.textui.TestRunner.run(InetAddress.class);
}
public void test_getLocalHost() {
try{
System.setSecurityManager(new Inet_SecurityManager());
String hostname=InetAddress.getLocalHost().getHostName();
assertEquals("localhost", hostname);
} catch (Exception e){
fail("Unexpected exception = " + e);
};
}
}
class Inet_SecurityManager extends SecurityManager {
public void checkConnect(String host, int port) {
super.checkConnect(host,port);
throw new SecurityException();
}
}
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