/** Returns true if host matches the LOOPBACK (127.0.0.1). */
public static boolean isLoopback(Object host) {
if (host instanceof InetAddress) {
return LOOPBACK.equals(host);
} else {
return isLoopback(InetAddressUtil.toInetAddress(host.toString()));
}
}
/** Returns true if host matches the LOCALHOST. */
public static boolean isLocalHost(Object host) {
if (host instanceof InetAddress) {
if (LOCALHOST.equals(host)) {
return true;
} else {
// InetAddress hostAddr = (InetAddress)host;
try {
Enumeration en = NetworkInterface.getNetworkInterfaces();
while (en.hasMoreElements()) {
NetworkInterface i = (NetworkInterface) en.nextElement();
for (Enumeration en2 = i.getInetAddresses(); en2.hasMoreElements(); ) {
InetAddress addr = (InetAddress) en2.nextElement();
if (host.equals(addr)) {
return true;
}
}
}
return false;
} catch (SocketException e) {
throw new GemFireIOException(
LocalizedStrings.InetAddressUtil_UNABLE_TO_QUERY_NETWORK_INTERFACE
.toLocalizedString(),
e);
}
}
} else {
return isLocalHost(InetAddressUtil.toInetAddress(host.toString()));
}
}
/**
* Provides static utilities for manipulating, validating, and converting InetAddresses and host
* strings.
*
* @author Kirk Lund
* @since 3.5
*/
public class InetAddressUtil {
/** InetAddress instance representing the local host */
public static final InetAddress LOCALHOST = createLocalHost();
public static final String LOOPBACK_ADDRESS =
Boolean.getBoolean("java.net.preferIPv6Addresses") ? "::1" : "127.0.0.1";
public static final InetAddress LOOPBACK = InetAddressUtil.toInetAddress(LOOPBACK_ADDRESS);
/** Disallows InetAddressUtil instantiation. */
private InetAddressUtil() {}
/**
* Returns a string version of InetAddress which can be converted back to an InetAddress later.
* Essentially any leading slash is trimmed.
*
* @param val the InetAddress or String to return a formatted string of
* @return string version the InetAddress minus any leading slash
*/
public static String toString(Object val) {
if (val instanceof String) {
return trimLeadingSlash((String) val);
} else if (val instanceof InetAddress) {
return ((InetAddress) val).getHostAddress();
} else {
return trimLeadingSlash(val.toString());
}
}
/**
* Converts the string host to an instance of InetAddress. Returns null if the string is empty.
* Fails Assertion if the conversion would result in <code>java.lang.UnknownHostException</code>.
*
* <p>Any leading slashes on host will be ignored.
*
* @param host string version the InetAddress
* @return the host converted to InetAddress instance
*/
public static InetAddress toInetAddress(String host) {
if (host == null || host.length() == 0) {
return null;
}
try {
if (host.indexOf("/") > -1) {
return InetAddress.getByName(host.substring(host.indexOf("/") + 1));
} else {
return InetAddress.getByName(host);
}
} catch (java.net.UnknownHostException e) {
logStackTrace(e);
Assert.assertTrue(false, "Failed to get InetAddress: " + host);
return null; // will never happen since the Assert will fail
}
}
/**
* Creates an InetAddress representing the local host. The checked exception <code>
* java.lang.UnknownHostException</code> is captured and results in an Assertion failure instead.
*
* @return InetAddress instance representing the local host
*/
public static InetAddress createLocalHost() {
try {
return SocketCreator.getLocalHost();
} catch (java.net.UnknownHostException e) {
logStackTrace(e);
Assert.assertTrue(false, "Failed to get local host");
return null; // will never happen
}
}
/**
* Validates the host by making sure it can successfully be used to get an instance of
* InetAddress. If the host string is null, empty or would result in <code>
* java.lang.UnknownHostException</code> then null is returned.
*
* <p>Any leading slashes on host will be ignored.
*
* @param host string version the InetAddress
* @return the host converted to InetAddress instance
*/
public static String validateHost(String host) {
if (host == null || host.length() == 0) {
return null;
}
try {
InetAddress.getByName(trimLeadingSlash(host));
return host;
} catch (java.net.UnknownHostException e) {
logStackTrace(e);
return null;
}
}
/** Returns true if host matches the LOCALHOST. */
public static boolean isLocalHost(Object host) {
if (host instanceof InetAddress) {
if (LOCALHOST.equals(host)) {
return true;
} else {
// InetAddress hostAddr = (InetAddress)host;
try {
Enumeration en = NetworkInterface.getNetworkInterfaces();
while (en.hasMoreElements()) {
NetworkInterface i = (NetworkInterface) en.nextElement();
for (Enumeration en2 = i.getInetAddresses(); en2.hasMoreElements(); ) {
InetAddress addr = (InetAddress) en2.nextElement();
if (host.equals(addr)) {
return true;
}
}
}
return false;
} catch (SocketException e) {
throw new GemFireIOException(
LocalizedStrings.InetAddressUtil_UNABLE_TO_QUERY_NETWORK_INTERFACE
.toLocalizedString(),
e);
}
}
} else {
return isLocalHost(InetAddressUtil.toInetAddress(host.toString()));
}
}
/** Returns true if host matches the LOOPBACK (127.0.0.1). */
public static boolean isLoopback(Object host) {
if (host instanceof InetAddress) {
return LOOPBACK.equals(host);
} else {
return isLoopback(InetAddressUtil.toInetAddress(host.toString()));
}
}
/** Returns a version of the value after removing any leading slashes */
private static String trimLeadingSlash(String value) {
if (value == null) return "";
while (value.indexOf("/") > -1) {
value = value.substring(value.indexOf("/") + 1);
}
return value;
}
/**
* Logs the stack trace for the given Throwable if logger is initialized else prints the stack
* trace using System.out. If logged the logs are logged at WARNING level.
*
* @param throwable Throwable to log stack trace for
*/
private static void logStackTrace(Throwable throwable) {
AdminDistributedSystemImpl adminDS = AdminDistributedSystemImpl.getConnectedInstance();
if (adminDS != null) {
adminDS.getLogWriter().warning(throwable);
} else {
throwable.printStackTrace();
}
}
}
