org.h2.util

Class NetUtils

java.lang.Object

org.h2.util.NetUtils

public class NetUtils
extends java.lang.Object

This utility class contains socket helper functions.

Method Summary

Modifier and Type	Method and Description
static java.net.ServerSocket	closeSilently(java.net.ServerSocket socket) Close a server socket and ignore any exceptions.
static java.net.Socket	createLoopbackSocket(int port, boolean ssl) Create a loopback socket (a socket that is connected to localhost) on this port.
static java.net.ServerSocket	createServerSocket(int port, boolean ssl) Create a server socket.
static java.net.Socket	createSocket(java.net.InetAddress address, int port, boolean ssl) Create a client socket that is connected to the given address and port.
static java.net.Socket	createSocket(java.lang.String server, int defaultPort, boolean ssl) Create a client socket that is connected to the given address and port.
static java.lang.String	getHostName(java.lang.String localAddress) Get the host name of a local address, if available.
static java.lang.String	getLocalAddress() Get the local host address as a string.
static boolean	isLocalAddress(java.net.Socket socket) Check if a socket is connected to a local address.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

createLoopbackSocket

public static java.net.Socket createLoopbackSocket(int port,
                                                   boolean ssl)
                                            throws java.io.IOException

Create a loopback socket (a socket that is connected to localhost) on this port.

Parameters:

port - the port

ssl - if SSL should be used

Returns:

the socket

Throws:

java.io.IOException

createSocket

public static java.net.Socket createSocket(java.lang.String server,
                                           int defaultPort,
                                           boolean ssl)
                                    throws java.io.IOException

Create a client socket that is connected to the given address and port.

Parameters:

server - to connect to (including an optional port)

defaultPort - the default port (if not specified in the server address)

ssl - if SSL should be used

Returns:

the socket

Throws:

java.io.IOException

createSocket

public static java.net.Socket createSocket(java.net.InetAddress address,
                                           int port,
                                           boolean ssl)
                                    throws java.io.IOException

Create a client socket that is connected to the given address and port.

Parameters:

address - the address to connect to

port - the port

ssl - if SSL should be used

Returns:

the socket

Throws:

java.io.IOException

createServerSocket

public static java.net.ServerSocket createServerSocket(int port,
                                                       boolean ssl)

Create a server socket. The system property h2.bindAddress is used if set. If SSL is used and h2.enableAnonymousTLS is true, an attempt is made to modify the security property jdk.tls.legacyAlgorithms (in newer JVMs) to allow anonymous TLS.

This system change is effectively permanent for the lifetime of the JVM.

Parameters:

port - the port to listen on

ssl - if SSL should be used

Returns:

the server socket

See Also:

CipherFactory.removeAnonFromLegacyAlgorithms()

isLocalAddress

public static boolean isLocalAddress(java.net.Socket socket)
                              throws java.net.UnknownHostException

Check if a socket is connected to a local address.

Parameters:

socket - the socket

Returns:

true if it is

Throws:

java.net.UnknownHostException

closeSilently

public static java.net.ServerSocket closeSilently(java.net.ServerSocket socket)

Close a server socket and ignore any exceptions.

Parameters:

socket - the socket

Returns:

null

getLocalAddress

public static java.lang.String getLocalAddress()

Get the local host address as a string. For performance, the result is cached for one second.

Returns:

the local host address

getHostName

public static java.lang.String getHostName(java.lang.String localAddress)

Get the host name of a local address, if available.

Parameters:

localAddress - the local address

Returns:

the host name, or another text if not available