/*
* @(#)PlainDatagramSocketImpl.java 1.39 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.net;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.Enumeration;
/**
* 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;
private int trafficClass = 0;
private boolean connected = false;
private InetAddress connectedAddress = null;
private int connectedPort = -1;
/* cached socket options */
private int multicastInterface = 0;
private boolean loopbackMode = true;
private int ttl = -1;
/* Used for IPv6 on Windows only */
private FileDescriptor fd1;
private int fduse=-1; /* saved between peek() and receive() calls */
/* saved between successive calls to receive, if data is detected
* on both sockets at same time. To ensure that one socket is not
* starved, they rotate using this field
*/
private int lastfd=-1;
/*
* Needed for ipv6 on windows because we need to know
* if the socket was bound to ::0 or 0.0.0.0, when a caller
* asks for it. In this case, both sockets are used, but we
* don't know whether the caller requested ::0 or 0.0.0.0
* and need to remember it here.
*/
private InetAddress anyLocalBoundAddr=null;
/**
* Load net library into runtime.
*/
static {
java.security.AccessController.doPrivileged(
new sun.security.action.LoadLibraryAction("net"));
init();
}
/**
* Creates a datagram socket
*/
protected synchronized void create() throws SocketException {
fd = new FileDescriptor();
fd1 = new FileDescriptor();
datagramSocketCreate();
}
/**
* Binds a datagram socket to a local port.
*/
protected synchronized void bind(int lport, InetAddress laddr)
throws SocketException {
bind0(lport, laddr);
if (laddr.isAnyLocalAddress()) {
anyLocalBoundAddr = laddr;
}
}
protected synchronized native void bind0(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;
/**
* Connects a datagram socket to a remote destination. This associates the remote
* address with the local socket so that datagrams may only be sent to this destination
* and received from this destination.
* @param address the remote InetAddress to connect to
* @param port the remote port number
*/
protected void connect(InetAddress address, int port) throws SocketException {
connect0(address, port);
connectedAddress = address;
connectedPort = port;
connected = true;
}
/**
* Disconnects a previously connected socket. Does nothing if the socket was
* not connected already.
*/
protected void disconnect() {
disconnect0(connectedAddress.family);
connected = false;
connectedAddress = null;
connectedPort = -1;
}
/**
* 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;
protected synchronized native int peekData(DatagramPacket p) throws IOException;
/**
* Receive the datagram packet.
* @param Packet Received.
*/
protected synchronized void receive(DatagramPacket p)
throws IOException {
try {
receive0(p);
} finally {
fduse = -1;
}
}
protected synchronized native void receive0(DatagramPacket p)
throws IOException;
/**
* Set the TTL (time-to-live) option.
* @param TTL to be set.
*/
protected native void setTimeToLive(int ttl) throws IOException;
/**
* Get the TTL (time-to-live) option.
*/
protected native int getTimeToLive() 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 void join(InetAddress inetaddr) throws IOException {
join(inetaddr, null);
}
/**
* Leave the multicast group.
* @param multicast address to leave.
*/
protected void leave(InetAddress inetaddr) throws IOException {
leave(inetaddr, null);
}
/**
* Join the multicast group.
* @param multicast address to join.
* @param netIf specifies the local interface to receive multicast
* datagram packets
* @throws IllegalArgumentException if mcastaddr is null or is a
* SocketAddress subclass not supported by this socket
* @since 1.4
*/
protected void joinGroup(SocketAddress mcastaddr, NetworkInterface netIf)
throws IOException {
if (mcastaddr == null || !(mcastaddr instanceof InetSocketAddress))
throw new IllegalArgumentException("Unsupported address type");
join(((InetSocketAddress)mcastaddr).getAddress(), netIf);
}
private native void join(InetAddress inetaddr, NetworkInterface netIf)
throws IOException;
/**
* Leave the multicast group.
* @param multicast address to leave.
* @param netIf specified the local interface to leave the group at
* @throws IllegalArgumentException if mcastaddr is null or is a
* SocketAddress subclass not supported by this socket
* @since 1.4
*/
protected void leaveGroup(SocketAddress mcastaddr, NetworkInterface netIf)
throws IOException {
if (mcastaddr == null || !(mcastaddr instanceof InetSocketAddress))
throw new IllegalArgumentException("Unsupported address type");
leave(((InetSocketAddress)mcastaddr).getAddress(), netIf);
}
private native void leave(InetAddress inetaddr, NetworkInterface netIf)
throws IOException;
/**
* Close the socket.
*/
protected void close() {
if (fd != null || fd1 != null) {
datagramSocketClose();
fd = null;
fd1 = null;
}
}
protected 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 {
if (fd == null && fd1 == null) {
throw new SocketException("Socket Closed");
}
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 IP_TOS:
if (o == null || !(o instanceof Integer)) {
throw new SocketException("bad argument for IP_TOS");
}
trafficClass = ((Integer)o).intValue();
break;
case SO_REUSEADDR:
if (o == null || !(o instanceof Boolean)) {
throw new SocketException("bad argument for SO_REUSEADDR");
}
break;
case SO_BROADCAST:
if (o == null || !(o instanceof Boolean)) {
throw new SocketException("bad argument for SO_BROADCAST");
}
break;
case SO_BINDADDR:
throw new SocketException("Cannot re-bind Socket");
case SO_RCVBUF:
case SO_SNDBUF:
if (o == null || !(o instanceof Integer) ||
((Integer)o).intValue() < 0) {
throw new SocketException("bad argument for SO_SNDBUF or " +
"SO_RCVBUF");
}
break;
case IP_MULTICAST_IF:
if (o == null || !(o instanceof InetAddress))
throw new SocketException("bad argument for IP_MULTICAST_IF");
break;
case IP_MULTICAST_IF2:
if (o == null || !(o instanceof NetworkInterface))
throw new SocketException("bad argument for IP_MULTICAST_IF2");
break;
case IP_MULTICAST_LOOP:
if (o == null || !(o instanceof Boolean))
throw new SocketException("bad argument for IP_MULTICAST_LOOP");
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 (fd == null && fd1 == null) {
throw new SocketException("Socket Closed");
}
Object result;
switch (optID) {
case SO_TIMEOUT:
result = new Integer(timeout);
break;
case IP_TOS:
result = socketGetOption(optID);
if ( ((Integer)result).intValue() == -1) {
result = new Integer(trafficClass);
}
break;
case SO_BINDADDR:
if (fd != null && fd1 != null) {
return anyLocalBoundAddr;
}
/* fall through */
case IP_MULTICAST_IF:
case IP_MULTICAST_IF2:
case SO_RCVBUF:
case SO_SNDBUF:
case IP_MULTICAST_LOOP:
case SO_REUSEADDR:
case SO_BROADCAST:
result = socketGetOption(optID);
break;
default:
throw new SocketException("invalid option: " + optID);
}
return result;
}
private native void datagramSocketCreate() throws SocketException;
private native void datagramSocketClose();
private native void socketSetOption(int opt, Object val)
throws SocketException;
private native Object socketGetOption(int opt) throws SocketException;
private native void connect0(InetAddress address, int port) throws SocketException;
private native void disconnect0(int family);
/**
* Perform class load-time initializations.
*/
private native static void init();
}
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