Bug ID: JDK-4073539 InetAddress get local host fails on Solaris in some cases

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1.2.2 1.2.2Fixed

If the first entry of /etc/hosts is localhost on Solaris, the getLocalHost call will return "localhost".


dale.mcduffie@Eng 1998-09-30
----------------------------
A customer reports that this bug is in fact not fixed in 1.2beta4: they are not
using NIS. I am unable to find a non-NIS machine, but believe that the customer
is correct. Here is the call with the test case:

Bug #4073539 describes how java.net.InetAddress.getLocalHost()
returns the first entry in /etc/hosts instead of the correct
address.  That bug page is labeled "closed, fixed in 1.2beta4,
1998-04-13".  However, the bug is still present in 1.2beta4
on my Solaris 2.6 system, as seen below.


[baskerville] uname -a
SunOS baskerville.CS.Arizona.EDU 5.6 Generic_105181-06 sun4u sparc SUNW,Ultra-1
[baskerville] java -version
java version "1.2beta4"
Classic VM (build JDK-1.2beta4-K, green threads, sunwjit)
[baskerville] java -fullversion
java full version "JDK-1.2beta4-K"
[baskerville] 
[baskerville] cat t.java

import java.net.*;

class t {
    public static void main (String args[]) {
        try {
            System.out.println(InetAddress.getLocalHost().getHostName());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

[baskerville] 
[baskerville] javac t.java
[baskerville] java t
localhost
[baskerville]

CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: 1.2.2 FIXED IN: 1.2.2 INTEGRATED IN: 1.2.2
14-06-2004
SUGGESTED FIX Use sysV sysinfo callinstead of getlocalhost in the implementation.
11-06-2004
WORK AROUND Make sure that the first entry in /etc/hosts is the actual host name and not "localhost". jeff.nisewanger@Eng 1998-12-15
15-12-1998
EVALUATION Fixed in 1.2beta4. benjamin.renaud@Eng 1998-04-13 All we do is call gethostname() from libc. If it gives us a goofy answer then that is a Solaris bug -- it will be giving goofy answers to a bunch of other software on the same machine also. It's hard to see how this is the JDK's problem. jeff.nisewanger@Eng 1998-10-27 Actually gethostname() returns the correct host name which isn't a fully qualified host name. InetAddressImpl.c tries its best to get a fully qualified host name. It calls gethostbyname_r() to get the IP address; then calls gethostbyaddr_r() to get the host name - in some cases, it gets fully qualified name at this point. But due to a solaris bug (#4185755), if "files" is the first source for "hosts" in /etc/nsswitch.conf, the first entry in /etc/hosts is returned instead of the correct host information. To work around this solaris bug, we can check the host name returned by gethostbyaddr_r(). If the host name returned by gethostname() isn't a prefix of the name returned by gethostbyaddr_r(), we just return the host name returned by gethostname(). sharon.liu@eng 1998-10-29
29-10-1998

Duplicate :	JDK-4056768 - InetAddress.getLocalHost() always returns "localhost"
Duplicate :	JDK-4060691 - java.net.InetAddress.getLocalHost() returns 127.0.0.1
Duplicate :	JDK-4065543 - getByName returns a different result from the one for getLocalHost
Duplicate :	JDK-4163652 - InetAddress.getLocalHost returns first line in /etc/hosts
Duplicate :	JDK-4073306 - iaddr.getLocalHost/iaddr.getHostName() does not understand /etc/hosts correctly
Duplicate :	JDK-4088617 - InetAddress.getLocalHost() not returning host-info
Duplicate :	JDK-4066222 - pass wrong parameter to gethostbyaddr_r() in java_net_InetAddressImpl_getLocalHo