https://bz.apache.org/bugzilla/show_bug.cgi?id=62566
Bug ID: 62566
Summary: hostinfo task unusable if network interface is
multihomed
Product: Ant
Version: 1.10.5
Hardware: All
OS: HP-UX
Status: NEW
Severity: major
Priority: P2
Component: Core tasks
Assignee: notifications@ant.apache.org
Reporter: 1983-01...@gmx.net
Target Milestone: ---
Using <hostinfo /> on a multihomed machine gives incorrect hostname and host
address due to the best matching algorithm.
I have refactored Ant's code into a seperate class with a custom traversal for
my machine interfaces:
> public static void main(String[] args) throws Exception {
> InetAddress lo = InetAddress.getLocalHost();
> System.out.println("InetAddress.getLocalHost():");
> System.out.println(" HostName: " + lo.getHostName());
> System.out.println(" CanonicalHostName: " + lo.getCanonicalHostName());
> System.out.println(" HostAddress: " + lo.getHostAddress());
>
> Enumeration<NetworkInterface> ee =
> NetworkInterface.getNetworkInterfaces();
> System.out.println("Network Interfaces:");
> while (ee.hasMoreElements()) {
> NetworkInterface ni = ee.nextElement();
> if (!ni.isLoopback()) {
> System.out.println(
> " " + ni + " (" + (ni.isVirtual() ?
> "virtual" : "physical") + ")");
> List<InetAddress> addrs =
> Collections.list(ni.getInetAddresses());
>
> if (!addrs.isEmpty()) {
>
> System.out.println(" Addresses:");
>
> for (InetAddress inetAddress : addrs) {
> System.out.println(" " +
> inetAddress);
> }
> }
>
> List<NetworkInterface> see =
> Collections.list(ni.getSubInterfaces());
> if (!see.isEmpty()) {
> System.out.println(" Virtual Network
> Interfaces:");
> for (NetworkInterface vni : see) {
> System.out.println(" " + vni + " ("
> + (vni.isVirtual() ?
> "virtual" : "physical") + ")");
>
> List<InetAddress> vaddrs =
> Collections.list(vni.getInetAddresses());
>
> if (!vaddrs.isEmpty()) {
>
> System.out.println("
> Addresses:");
>
> for (InetAddress inetAddress :
> vaddrs) {
> System.out.println("
> " + inetAddress);
> }
> }
> }
> }
> }
> }
>
> HostInfo hi = new HostInfo();
> hi.executeLocal();
> System.out.println("Ant's HostInfo task:");
> System.out.println(" " + hi.props);
> }
The output is:
> bash $ java HostInfo
> InetAddress.getLocalHost():
> HostName: blnn724x.ad001.siemens.net
> CanonicalHostName: blnn724x.ad001.siemens.net
> HostAddress: 147.54.64.24
> Network Interfaces:
> name:lan0 (lan0) (physical)
> Addresses:
> /147.54.65.7
> /147.54.65.2
> /147.54.64.24
> Virtual Network Interfaces:
> name:lan0:2 (lan0:2) (virtual)
> Addresses:
> /147.54.65.7
> name:lan0:1 (lan0:1) (virtual)
> Addresses:
> /147.54.65.2
> Ant's HostInfo task:
> {ADDR6=::1, ADDR4=147.54.65.7, DOMAIN=bln3.siemens.de, NAME=hp7v}
As you can see, the task is unusable on this host. I know that changing the
code might break others, but a better option would be either to exclude
addresses on virtual interfaces OR provide two strategies: bestmatch and
localhost.
I am on Java 8 and HP-UX 11.31.
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