[jira] [Resolved] (KARAF-7096) When rmiServerHost is 127.0.0.1, RMIServerImpl_Stub still uses hostname's IP

["Jean-Baptiste Onofré (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KARAF-7096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Baptiste Onofré resolved KARAF-7096.
-----------------------------------------
    Target Version/s: 4.2.12, 4.3.2
          Resolution: Fixed

> When rmiServerHost is 127.0.0.1, RMIServerImpl_Stub still uses hostname's IP
> ----------------------------------------------------------------------------
>
>                 Key: KARAF-7096
>                 URL: https://issues.apache.org/jira/browse/KARAF-7096
>             Project: Karaf
>          Issue Type: Bug
>    Affects Versions: 4.2.11, 4.3.1
>            Reporter: Grzegorz Grzybek
>            Assignee: Grzegorz Grzybek
>            Priority: Major
>             Fix For: 4.2.12, 4.3.2
>
>
> It's a follow-up of the investigation from KARAF-6955. Copying the description:
> I had problem after this change - {{jconsole}} stopped working and sample Java application ended with {{Connection refused}} exception.
> I did enjoyable analysis and I found that:
> * ports are opened on proper interfaces ({{::ffff:127.0.0.1}} in my case, which is an IPv6 address from _::ffff:0:0/96 CIDR_ that represents _Transition from IPv4_ address block)
> * I could connect to RMI Registry at port 1099 and even obtain {{karaf-root}} object from there, which:
> ** is of {{javax.management.remote.rmi.RMIServer}} interface
> ** is of {{javax.management.remote.rmi.RMIServerImpl_Stub}} implementation
> The problem is that this stub contains:
> {noformat}
> ref: java.rmi.server.RemoteRef  = {sun.rmi.server.UnicastRef2@1918} 
> ...
>  ref: sun.rmi.transport.LiveRef  = {sun.rmi.transport.LiveRef@1925} "[endpoint:[192.168.0.38:44444](remote),objID:[2f23195f:178a6a29327:-7ffa, 4962682433218761153]]"
>   ep: sun.rmi.transport.Endpoint  = {sun.rmi.transport.tcp.TCPEndpoint@1927} "[192.168.0.38:44444]"
>    host: java.lang.String  = "192.168.0.38"
>    port: int  = 44444 (0xAD9C)
> {noformat}
> The problem is that when {{RMIServerImpl_Stub}} is created *at server side* by karaf.management.server bundle, the bind address of this remote object is NOT taken from {{rmiServerHost}} property of {{org.apache.karaf.management}} PID. It's taken from (top to bottom):
> * sun.rmi.transport.tcp.TCPEndpoint#getLocalEndpoint()
> * java.net.InetAddress#getLocalHost()
> * java.net.InetAddressImpl#getLocalHostName()
> * java.net.InetAddress#getAddressesFromNameService()
> * java.net.Inet6AddressImpl#lookupAllHostAddr()
> * getaddress() libc method
> * /etc/hosts
> The way to solve this is to set {{java.rmi.server.hostname}} system property to 127.0.0.1, so the Stub contains proper address.



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