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|
import java.io.IOException;
import java.net.InetAddress;
import java.net.Inet6Address;
import java.util.Enumeration;
import java.util.concurrent.*;
import org.savarese.vserv.tcpip.*;
import org.savarese.rocksaw.net.RawSocket;
import static org.savarese.rocksaw.net.RawSocket.PF_INET;
import static org.savarese.rocksaw.net.RawSocket.PF_INET6;
import static org.savarese.rocksaw.net.RawSocket.getProtocolByName;
import static org.savarese.vserv.tcpip.ICMPPacket.OFFSET_ICMP_CHECKSUM;
/**
* <p>The Ping class is a simple demo showing how you can send
* ICMP echo requests and receive echo replies using raw sockets.
* It has been updated to work with both IPv4 and IPv6.</p>
*
* <p>Note, this is not a model of good programming. The point
* of the example is to show how the RawSocket API calls work. There
* is much kluginess surrounding the actual packet and protocol
* handling, all of which is outside of the scope of what RockSaw
* does.</p>
*
* @author <a href="http://www.savarese.org/">Daniel F. Savarese</a>
*/
public class Ping {
public static interface EchoReplyListener {
public void notifyEchoReply(ICMPEchoPacket packet,
byte[] data, int dataOffset,
byte[] srcAddress)
throws IOException;
}
public static class Pinger {
private static final int TIMEOUT = 10000;
protected RawSocket socket;
protected ICMPEchoPacket sendPacket, recvPacket;
protected int offset, length, dataOffset;
protected int requestType, replyType;
protected byte[] sendData, recvData, srcAddress;
protected int sequence, identifier;
protected EchoReplyListener listener;
protected Pinger(int id, int protocolFamily, int protocol)
throws IOException
{
sequence = 0;
identifier = id;
setEchoReplyListener(null);
sendPacket = new ICMPEchoPacket(1);
recvPacket = new ICMPEchoPacket(1);
sendData = new byte[84];
recvData = new byte[84];
sendPacket.setData(sendData);
recvPacket.setData(recvData);
sendPacket.setIPHeaderLength(5);
recvPacket.setIPHeaderLength(5);
sendPacket.setICMPDataByteLength(56);
recvPacket.setICMPDataByteLength(56);
offset = sendPacket.getIPHeaderByteLength();
dataOffset = offset + sendPacket.getICMPHeaderByteLength();
length = sendPacket.getICMPPacketByteLength();
socket = new RawSocket();
socket.open(protocolFamily, protocol);
try {
socket.setSendTimeout(TIMEOUT);
socket.setReceiveTimeout(TIMEOUT);
} catch(java.net.SocketException se) {
socket.setUseSelectTimeout(true);
socket.setSendTimeout(TIMEOUT);
socket.setReceiveTimeout(TIMEOUT);
}
}
public Pinger(int id) throws IOException {
this(id, PF_INET, getProtocolByName("icmp"));
srcAddress = new byte[4];
requestType = ICMPPacket.TYPE_ECHO_REQUEST;
replyType = ICMPPacket.TYPE_ECHO_REPLY;
}
protected void computeSendChecksum(InetAddress host)
throws IOException
{
sendPacket.computeICMPChecksum();
}
public void setEchoReplyListener(EchoReplyListener l) {
listener = l;
}
/**
* Closes the raw socket opened by the constructor. After calling
* this method, the object cannot be used.
*/
public void close() throws IOException {
socket.close();
}
public void sendEchoRequest(InetAddress host) throws IOException {
sendPacket.setType(requestType);
sendPacket.setCode(0);
sendPacket.setIdentifier(identifier);
sendPacket.setSequenceNumber(sequence++);
OctetConverter.longToOctets(System.nanoTime(), sendData, dataOffset);
computeSendChecksum(host);
socket.write(host, sendData, offset, length);
}
public void receive() throws IOException {
socket.read(recvData, srcAddress);
}
public void receiveEchoReply() throws IOException {
do {
receive();
} while(recvPacket.getType() != replyType ||
recvPacket.getIdentifier() != identifier);
if(listener != null)
listener.notifyEchoReply(recvPacket, recvData, dataOffset, srcAddress);
}
/**
* Issues a synchronous ping.
*
* @param host The host to ping.
* @return The round trip time in nanoseconds.
*/
public long ping(InetAddress host) throws IOException {
sendEchoRequest(host);
receiveEchoReply();
long end = System.nanoTime();
long start = OctetConverter.octetsToLong(recvData, dataOffset);
return (end - start);
}
/**
* @return The number of bytes in the data portion of the ICMP ping request
* packet.
*/
public int getRequestDataLength() {
return sendPacket.getICMPDataByteLength();
}
/** @return The number of bytes in the entire IP ping request packet. */
public int getRequestPacketLength() {
return sendPacket.getIPPacketLength();
}
}
public static class PingerIPv6 extends Pinger {
private static final int IPPROTO_ICMPV6 = 58;
private static final int ICMPv6_TYPE_ECHO_REQUEST = 128;
private static final int ICMPv6_TYPE_ECHO_REPLY = 129;
/**
* Operating system kernels are supposed to calculate the ICMPv6
* checksum for the sender, but Microsoft's IPv6 stack does not do
* this. Nor does it support the IPV6_CHECKSUM socket option.
* Therefore, in order to work on the Windows family of operating
* systems, we have to calculate the ICMPv6 checksum.
*/
private static class ICMPv6ChecksumCalculator extends IPPacket {
ICMPv6ChecksumCalculator() { super(1); }
private int computeVirtualHeaderTotal(byte[] destination, byte[] source,
int icmpLength)
{
int total = 0;
for(int i = 0; i < source.length;)
total+=(((source[i++] & 0xff) << 8) | (source[i++] & 0xff));
for(int i = 0; i < destination.length;)
total+=(((destination[i++] & 0xff) << 8) | (destination[i++] & 0xff));
total+=(icmpLength >>> 16);
total+=(icmpLength & 0xffff);
total+=IPPROTO_ICMPV6;
return total;
}
int computeChecksum(byte[] data, ICMPPacket packet, byte[] destination,
byte[] source)
{
int startOffset = packet.getIPHeaderByteLength();
int checksumOffset = startOffset + OFFSET_ICMP_CHECKSUM;
int ipLength = packet.getIPPacketLength();
int icmpLength = packet.getICMPPacketByteLength();
setData(data);
return
_computeChecksum_(startOffset, checksumOffset, ipLength,
computeVirtualHeaderTotal(destination, source,
icmpLength), true);
}
}
private byte[] localAddress;
private ICMPv6ChecksumCalculator icmpv6Checksummer;
public PingerIPv6(int id) throws IOException {
//socket.open(protocolFamily,
super(id, PF_INET6, IPPROTO_ICMPV6 /*getProtocolByName("ipv6-icmp")*/);
icmpv6Checksummer = new ICMPv6ChecksumCalculator();
srcAddress = new byte[16];
localAddress = new byte[16];
requestType = ICMPv6_TYPE_ECHO_REQUEST;
replyType = ICMPv6_TYPE_ECHO_REPLY;
}
protected void computeSendChecksum(InetAddress host)
throws IOException
{
// This is necessary only for Windows, which doesn't implement
// RFC 2463 correctly.
socket.getSourceAddressForDestination(host, localAddress);
icmpv6Checksummer.computeChecksum(sendData, sendPacket,
host.getAddress(), localAddress);
}
public void receive() throws IOException {
socket.read(recvData, offset, length, srcAddress);
}
}
public static final void main(String[] args) throws Exception {
if(args.length < 1 || args.length > 2) {
System.err.println("usage: Ping host [count]");
System.exit(1);
}
final ScheduledThreadPoolExecutor executor =
new ScheduledThreadPoolExecutor(2);
try{
final InetAddress address = InetAddress.getByName(args[0]);
final String hostname = address.getCanonicalHostName();
final String hostaddr = address.getHostAddress();
final int count;
// Ping programs usually use the process ID for the identifier,
// but we can't get it and this is only a demo.
final int id = 65535;
final Pinger ping;
if(args.length == 2)
count = Integer.parseInt(args[1]);
else
count = 5;
if(address instanceof Inet6Address)
ping = new Ping.PingerIPv6(id);
else
ping = new Ping.Pinger(id);
ping.setEchoReplyListener(new EchoReplyListener() {
StringBuffer buffer = new StringBuffer(128);
public void notifyEchoReply(ICMPEchoPacket packet,
byte[] data, int dataOffset,
byte[] srcAddress)
throws IOException
{
long end = System.nanoTime();
long start = OctetConverter.octetsToLong(data, dataOffset);
// Note: Java and JNI overhead will be noticeable (100-200
// microseconds) for sub-millisecond transmission times.
// The first ping may even show several seconds of delay
// because of initial JIT compilation overhead.
double rtt = (double)(end - start) / 1e6;
buffer.setLength(0);
buffer.append(packet.getICMPPacketByteLength())
.append(" bytes from ").append(hostname).append(" (");
buffer.append(InetAddress.getByAddress(srcAddress).toString());
buffer.append("): icmp_seq=")
.append(packet.getSequenceNumber())
.append(" ttl=").append(packet.getTTL()).append(" time=")
.append(rtt).append(" ms");
System.out.println(buffer.toString());
}
});
System.out.println("PING " + hostname + " (" + hostaddr + ") " +
ping.getRequestDataLength() + "(" +
ping.getRequestPacketLength() + ") bytes of data).");
final CountDownLatch latch = new CountDownLatch(1);
executor.scheduleAtFixedRate(new Runnable() {
int counter = count;
public void run() {
try {
if(counter > 0) {
ping.sendEchoRequest(address);
if(counter == count)
latch.countDown();
--counter;
} else
executor.shutdown();
} catch(IOException ioe) {
ioe.printStackTrace();
}
}
}, 0, 1, TimeUnit.SECONDS);
// We wait for first ping to be sent because Windows times out
// with WSAETIMEDOUT if echo request hasn't been sent first.
// POSIX does the right thing and just blocks on the first receive.
// An alternative is to bind the socket first, which should allow a
// receive to be performed frst on Windows.
latch.await();
for(int i = 0; i < count; ++i)
ping.receiveEchoReply();
ping.close();
} catch(Exception e) {
executor.shutdown();
e.printStackTrace();
}
}
} |
ping (rapide) en java
. entre temps j'ai trouvé des applications qui le font en utilisant icmp.dll de Windows.
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