JDK-6206527 : "cannot assign address" when binding ServerSocket on Suse 9
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.net
  • Affected Version: 5.0
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: linux_2.6,solaris_9
  • CPU: x86,sparc
  • Submitted: 2004-12-09
  • Updated: 2011-03-17
  • Resolved: 2005-04-15
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Other JDK 6
1.4.2_09Fixed 6 betaFixed
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Description
When IPv6 is enabled on Suse 9 (or JDS 3) it is not possible
to bind a ServerSocket to the local address.
App receives a "cannot assign requested address" error
###@###.### 2004-12-09 18:17:48 GMT


Just in case.., test case is here:
============ TestCase ===========

import java.net.*;

public class TestServer {

 public static void main(String[] args) throws Exception {

   if (args.length != 2) {
     System.out.println("Usage: java TestServer <host_address_ipv6> <port>");
     System.exit(1);
   }

   System.out.println("Host Address="+args[0]);
   System.out.println("Port        ="+args[1]);

   ServerSocket ss = new ServerSocket();

   ss.bind(new InetSocketAddress(InetAddress.getByName(args[0]), 
  	Integer.parseInt(args[1])));

   System.out.println("ServerSocket Bound");

   ss.accept();
 }
}
java TestServer <host ipv6 address> <port>

for host use local link-local address of the host port 5555

Verify:

On success, the server socket will be bound to the specified address and port. O
n failure some exception will be thrown. For
SuSE Linux ES 9.0, following is thrown:

Exception in thread "main" java.net.BindException: Cannot assign requested addre
ss
        at java.net.PlainSocketImpl.socketBind(Native Method)
        at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:331)
        at java.net.ServerSocket.bind(ServerSocket.java:318)
        at java.net.ServerSocket.bind(ServerSocket.java:276)
        at TestServer.main(TestServer.java:17)

--------------------------------------------------------------------------------
---

System Specification:

java version "1.4.2_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
Java HotSpot(TM) Client VM (build 1.4.2_05-b04, mixed mode)

SUSE LINUX Enterprise Server 9 (i586) - Kernel 2.6.5-7.97-default (6)
----------------end
###@###.### 2004-12-15 19:15:49 GMT

Comments
EVALUATION In the Linux native code, we use the kernel IPv6 routing table to figure out which scope_id value to use when a given Inet6Address has no scope_id set. For the local link-local address, this always points to the "lo" loopback interface, which is correct for destination addresses, ie. packets are sent out the loopback interface when the destination is the local LL address. However, this is not correct when binding to a local address. In this case, it doesn't make sense to set the scope_id to the loopback interface because that would seem to preclude binding on physical interfaces (which is normally what you want to do). This worked ok on Linux kernels prior to 2.6 because presumably they just ignored the scope_id setting in the bind() call. Unfortunately, it is broken now in 2.6. Linux should allow the application to use a scope_id of zero which would force the kernel to try an figure out which interface to use (in most cases it would be possible to determine it). Since it does not do this, we need to use a different method for determining the scope_id when binding to a local address. In this case, we will search /proc/net/if_inet6 instead of /proc/net/ipv6_route. ###@###.### 2005-1-04 13:31:44 GMT
2005-01-04