8220673: Add test library support for determining platform IP support
Reviewed-by: dfuchs, chegar
Contributed-by: aeubanks@google.com
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/**
* @test
* @bug 5087907
* @summary InetAddress.getAllByName does not obey setting of java.net.preferIPv6Addresses
* @run main/othervm -Djava.net.preferIPv6Addresses=false B5087907
* @run main/othervm -Djava.net.preferIPv6Addresses=true B5087907
* @run main/othervm B5087907
*/
import java.net.*;
public class B5087907 {
public static void main(String args[]) {
InetAddress lh = null;
InetAddress addrs[] = null;
try {
lh = InetAddress.getByName("localhost");
addrs = InetAddress.getAllByName("localhost");
} catch (UnknownHostException e) {
System.out.println ("Cant lookup localhost. cant run test");
return;
}
boolean hasIPv4Address = false;
boolean hasIPv6Address = false;
for (InetAddress addr: addrs) {
if (addr instanceof Inet4Address) {
hasIPv4Address = true;
}
if (addr instanceof Inet6Address) {
hasIPv6Address = true;
}
if (hasIPv4Address && hasIPv6Address) {
break;
}
}
String prop = System.getProperty("java.net.preferIPv6Addresses");
boolean preferIPv6Addresses = (prop == null) ? false : prop.equals("true");
System.out.println("java.net.preferIPv6Addresses: " + preferIPv6Addresses);
System.out.println("localhost resolves to:");
for (InetAddress addr: addrs) {
System.out.println(" " + addr);
}
System.out.println("InetAddres.getByName returned: " + lh);
boolean failed = false;
if (preferIPv6Addresses && hasIPv6Address) {
if (!(lh instanceof Inet6Address)) failed = true;
}
if (!preferIPv6Addresses && hasIPv4Address) {
if (!(lh instanceof Inet4Address)) failed = true;
}
if (failed) {
throw new RuntimeException("Test failed!");
}
}
}