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PlainDatagramSocketImpl.java
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1998-09-22
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/*
* @(#)PlainDatagramSocketImpl.java 1.10 98/07/01
*
* Copyright 1995-1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package java.net;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InterruptedIOException;
/**
* Concrete datagram and multicast socket implementation base class.
* Note: This is not a public class, so that applets cannot call
* into the implementation directly and hence cannot bypass the
* security checks present in the DatagramSocket and MulticastSocket
* classes.
*
* @author Pavani Diwanji
*/
class PlainDatagramSocketImpl extends DatagramSocketImpl
{
/* timeout value for receive() */
private int timeout = 0;
/**
* Load net library into runtime.
*/
static {
System.loadLibrary("net");
}
/**
* Creates a datagram socket
*/
protected synchronized void create() throws SocketException {
fd = new FileDescriptor();
datagramSocketCreate();
}
/**
* Binds a datagram socket to a local port.
*/
protected synchronized native void bind(int lport, InetAddress laddr) throws SocketException;
/**
* Sends a datagram packet. The packet contains the data and the
* destination address to send the packet to.
* @param packet to be sent.
*/
protected native void send(DatagramPacket p) throws IOException;
/**
* Peek at the packet to see who it is from.
* @param return the address which the packet came from.
*/
protected synchronized native int peek(InetAddress i) throws IOException;
/**
* Receive the datagram packet.
* @param Packet Received.
*/
protected synchronized native void receive(DatagramPacket p) throws IOException;
/**
* Set the TTL (time-to-live) option.
* @param TTL to be set.
*/
protected native void setTTL(byte ttl) throws IOException;
/**
* Get the TTL (time-to-live) option.
*/
protected native byte getTTL() throws IOException;
/**
* Join the multicast group.
* @param multicast address to join.
*/
protected native void join(InetAddress inetaddr) throws IOException;
/**
* Leave the multicast group.
* @param multicast address to leave.
*/
protected native void leave(InetAddress inetaddr) throws IOException;
/**
* Close the socket.
*/
protected void close() {
if (fd != null) {
datagramSocketClose();
fd = null;
}
}
protected synchronized void finalize() {
close();
}
/**
* set a value - since we only support (setting) binary options
* here, o must be a Boolean
*/
public void setOption(int optID, Object o) throws SocketException {
switch (optID) {
/* check type safety b4 going native. These should never
* fail, since only java.Socket* has access to
* PlainSocketImpl.setOption().
*/
case SO_TIMEOUT:
if (o == null || !(o instanceof Integer)) {
throw new SocketException("bad argument for SO_TIMEOUT");
}
int tmp = ((Integer) o).intValue();
if (tmp < 0)
throw new IllegalArgumentException("timeout < 0");
timeout = tmp;
return;
case SO_BINDADDR:
throw new SocketException("Cannot re-bind Socket");
case SO_REUSEADDR:
if (o == null || !(o instanceof Integer)) {
throw new SocketException("bad argument for SO_REUSEADDR");
}
break;
case IP_MULTICAST_IF:
if (o == null || !(o instanceof InetAddress))
throw new SocketException("bad argument for IP_MULTICAST_IF");
break;
default:
throw new SocketException("invalid option: " + optID);
}
socketSetOption(optID, o);
}
/*
* get option's state - set or not
*/
public Object getOption(int optID) throws SocketException {
if (optID == SO_TIMEOUT) {
return new Integer(timeout);
}
int ret = socketGetOption(optID);
if (optID == SO_BINDADDR || optID == IP_MULTICAST_IF) {
InetAddress in = new InetAddress();
in.address = ret;
return in;
} else {
return null;
}
}
private native void datagramSocketCreate() throws SocketException;
private native void datagramSocketClose();
private native void socketSetOption(int opt, Object val) throws SocketException;
private native int socketGetOption(int opt) throws SocketException;
}