Examples with Inet4Address java.net.Inet4Address used on opensource projects

Example 11 with Inet4Address

use of java.net.Inet4Address in project hudson-2.x by hudson.

the class Computer method getHostName.

/**
     * This method tries to compute the name of the host that's reachable by all the other nodes.
     *
     * <p>
     * Since it's possible that the slave is not reachable from the master (it may be behind a firewall,
     * connecting to master via JNLP), this method may return null.
     *
     * It's surprisingly tricky for a machine to know a name that other systems can get to,
     * especially between things like DNS search suffix, the hosts file, and YP.
     *
     * <p>
     * So the technique here is to compute possible interfaces and names on the slave,
     * then try to ping them from the master, and pick the one that worked.
     *
     * <p>
     * The computation may take some time, so it employs caching to make the successive lookups faster.
     *
     * @since 1.300
     * @return
     *      null if the host name cannot be computed (for example because this computer is offline,
     *      because the slave is behind the firewall, etc.) 
     */
public String getHostName() throws IOException, InterruptedException {
    if (hostNameCached)
        // in the worst case we end up having multiple threads computing the host name simultaneously, but that's not harmful, just wasteful.
        return cachedHostName;
    VirtualChannel channel = getChannel();
    // can't compute right now
    if (channel == null)
        return null;
    for (String address : channel.call(new ListPossibleNames())) {
        try {
            InetAddress ia = InetAddress.getByName(address);
            if (!(ia instanceof Inet4Address)) {
                LOGGER.fine(address + " is not an IPv4 address");
                continue;
            }
            if (!ComputerPinger.checkIsReachable(ia, 3)) {
                LOGGER.fine(address + " didn't respond to ping");
                continue;
            }
            cachedHostName = ia.getCanonicalHostName();
            hostNameCached = true;
            return cachedHostName;
        } catch (IOException e) {
            // if a given name fails to parse on this host, we get this error
            LOGGER.log(Level.FINE, "Failed to parse " + address, e);
        }
    }
    // allow the administrator to manually specify the host name as a fallback. HUDSON-5373
    cachedHostName = channel.call(new GetFallbackName());
    hostNameCached = true;
    return null;
}

Example 12 with Inet4Address

use of java.net.Inet4Address in project netty by netty.

the class DefaultHostsFileEntriesResolverTest method shouldntFindWhenAddressTypeDoesntMatch.

@Test
public void shouldntFindWhenAddressTypeDoesntMatch() {
    Map<String, Inet4Address> inet4Entries = new HashMap<String, Inet4Address>();
    Map<String, Inet6Address> inet6Entries = new HashMap<String, Inet6Address>();
    inet4Entries.put("localhost", NetUtil.LOCALHOST4);
    DefaultHostsFileEntriesResolver resolver = new DefaultHostsFileEntriesResolver(new HostsFileEntries(inet4Entries, inet6Entries));
    InetAddress address = resolver.address("localhost", ResolvedAddressTypes.IPV6_ONLY);
    Assert.assertNull("Should pick an IPv6 address", address);
}

Example 13 with Inet4Address

use of java.net.Inet4Address in project netty by netty.

the class DefaultHostsFileEntriesResolverTest method shouldPickIpv4WhenBothAreDefinedButIpv4IsPreferred.

@Test
public void shouldPickIpv4WhenBothAreDefinedButIpv4IsPreferred() {
    Map<String, Inet4Address> inet4Entries = new HashMap<String, Inet4Address>();
    Map<String, Inet6Address> inet6Entries = new HashMap<String, Inet6Address>();
    inet4Entries.put("localhost", NetUtil.LOCALHOST4);
    inet6Entries.put("localhost", NetUtil.LOCALHOST6);
    DefaultHostsFileEntriesResolver resolver = new DefaultHostsFileEntriesResolver(new HostsFileEntries(inet4Entries, inet6Entries));
    InetAddress address = resolver.address("localhost", ResolvedAddressTypes.IPV4_PREFERRED);
    Assert.assertTrue("Should pick an IPv4 address", address instanceof Inet4Address);
}

Example 14 with Inet4Address

use of java.net.Inet4Address in project platformlayer by platformlayer.

the class SocatPeerToPeerCopy method findChannel.

private InetAddressPair findChannel(OpsTarget src, OpsTarget target) throws OpsException {
    InetAddress srcAddress = ((SshOpsTarget) src).getHost();
    InetAddress targetAddress = ((SshOpsTarget) target).getHost();
    if (srcAddress instanceof Inet4Address) {
        if (targetAddress instanceof Inet6Address) {
            Inet6Address srcIpv6 = findIpv6(src);
            if (srcIpv6 != null) {
                srcAddress = srcIpv6;
            } else {
                throw new UnsupportedOperationException();
            }
        }
    } else {
        if (targetAddress instanceof Inet4Address) {
            Inet6Address targetIpv6 = findIpv6(target);
            if (targetIpv6 != null) {
                targetAddress = targetIpv6;
            } else {
                throw new UnsupportedOperationException();
            }
        }
    }
    return new InetAddressPair(srcAddress, targetAddress);
}

Example 15 with Inet4Address

use of java.net.Inet4Address in project platform_frameworks_base by android.

the class WifiDisplayController method getInterfaceAddress.

private static Inet4Address getInterfaceAddress(WifiP2pGroup info) {
    NetworkInterface iface;
    try {
        iface = NetworkInterface.getByName(info.getInterface());
    } catch (SocketException ex) {
        Slog.w(TAG, "Could not obtain address of network interface " + info.getInterface(), ex);
        return null;
    }
    Enumeration<InetAddress> addrs = iface.getInetAddresses();
    while (addrs.hasMoreElements()) {
        InetAddress addr = addrs.nextElement();
        if (addr instanceof Inet4Address) {
            return (Inet4Address) addr;
        }
    }
    Slog.w(TAG, "Could not obtain address of network interface " + info.getInterface() + " because it had no IPv4 addresses.");
    return null;
}