java.net.InetAddress.getLocalHost() returns wrong host name for loopback address ---------------------------------------------------------------------------------
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(); } } -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira