[Bug libgcj/24583] New: InetAddress.getLocalHost() returns broken InetAddress object when run in chroot

[Bug libgcj/24583] New: InetAddress.getLocalHost() returns broken InetAddress object when run in chroot

[greenrd at gcc dot gnu dot org]

When a Java program is run in a chroot environment on Linux,
InetAddress.getLocalHost() returns a broken InetAddress object (broken in the
same way as it was in bug 17069).

Test case:

import java.net.InetAddress;
import java.net.UnknownHostException;

public class TestAddr {

        public static void main (String args []) throws UnknownHostException {
                InetAddress.getLocalHost ().getAddress ();
        }

} // end of class TestAddr

The test case prints this inside the chroot:

Exception in thread "main" java.lang.NullPointerException
   at java.net.InetAddress.getAddress() (/usr/lib/libgcj.so.6.0.0)
   at TestAddr.main(java.lang.String[]) (Unknown Source)
   at gnu.java.lang.MainThread.call_main() (/usr/lib/libgcj.so.6.0.0)
   at gnu.java.lang.MainThread.run() (/usr/lib/libgcj.so.6.0.0)

and nothing when not in a chroot.

By using LD_LIBRARY_PATH I have verified that the brokenness _is_ triggered by
the chroot, not by the different versions of libc and libgcj that are
dynamically linked against when inside the chroot:

bash-3.00$ LD_LIBRARY_PATH=/mnt/rawhide/usr/lib:/mnt/rawhide/lib ldd
/mnt/rawhide/home/greenrd/testaddr
        linux-gate.so.1 =>  (0xffffe000)
        libgcc_s.so.1 => /mnt/rawhide/lib/libgcc_s.so.1 (0x00db1000)
        libgcj.so.6 => /mnt/rawhide/usr/lib/libgcj.so.6 (0x02000000)
        libm.so.6 => /mnt/rawhide/lib/libm.so.6 (0x00354000)
        libpthread.so.0 => /mnt/rawhide/lib/libpthread.so.0 (0x00390000)
        libz.so.1 => /mnt/rawhide/usr/lib/libz.so.1 (0x0037b000)
        libdl.so.2 => /mnt/rawhide/lib/libdl.so.2 (0x0034e000)
        libc.so.6 => /mnt/rawhide/lib/libc.so.6 (0xf7ed1000)
        /lib/ld-linux.so.2 (0x00248000)
bash-3.00$ LD_LIBRARY_PATH=/mnt/rawhide/usr/lib:/mnt/rawhide/lib
/mnt/rawhide/home/greenrd/testaddr
bash-3.00$

The real /dev, /proc and /sys are mounted inside the chroot, and /sbin/ifconfig
can see all the network interfaces and their IPs when run as the same user from
inside the chroot, so it is not the case that the kernel is hiding this
information.


-- 
           Summary: InetAddress.getLocalHost() returns broken InetAddress
                    object when run in chroot
           Product: gcc
           Version: 4.0.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libgcj
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: greenrd at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24583

[Bug libgcj/24583] InetAddress.getLocalHost() returns broken InetAddress object when run in chroot

[greenrd at gcc dot gnu dot org]

------- Comment #1 from greenrd at gcc dot gnu dot org  2005-10-30 00:21 -------
Also, the hostname command does work inside the chroot - it returns the
hostname of the real machine. So I don't think this is a reoccurrence of bug
17069.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24583

[Bug libgcj/24583] [4.0 only] InetAddress.getLocalHost() returns broken InetAddress object when local hostname cannot be resolved

[greenrd at gcc dot gnu dot org]

------- Comment #2 from greenrd at gcc dot gnu dot org  2005-10-30 12:00 -------
The real problem here was that I had a typo in my /etc/hosts, so the hostname
could not be resolved. I've updated the bug summary.

GNU classpath 0.18 implements the correct behaviour:

$ jamvm TestAddr
java.net.UnknownHostException: lcoyle1
   at java.net.VMInetAddress.getHostByName (Native Method)
   at java.net.InetAddress.getAllByName (InetAddress.java:667)
   at java.net.InetAddress.getByName (InetAddress.java:622)
   at java.net.InetAddress.getLocalHost (InetAddress.java:777)
   at TestAddr.main (TestAddr.java:7)


-- 

greenrd at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|InetAddress.getLocalHost()  |[4.0 only]
                   |returns broken InetAddress  |InetAddress.getLocalHost()
                   |object when run in chroot   |returns broken InetAddress
                   |                            |object when local hostname
                   |                            |cannot be resolved


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24583

[Bug libgcj/24583] [4.0 only] InetAddress.getLocalHost() returns broken InetAddress object when local hostname cannot be resolved

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2005-10-30 15:14 -------
So this is fixed in 4.1.0?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24583

[Bug libgcj/24583] [4.0 only] InetAddress.getLocalHost() returns broken InetAddress object when local hostname cannot be resolved

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2006-01-29 17:46 -------
Fixed in 4.1.0.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24583