Java 網絡數據分析包 JNetStream

JNetStream 是一個用 Java 語言開發的網絡數據包分析類庫，同時也提供了一個分析工具。可以通過內置的NPL語言定義自己需要的協議 (比如可用NPL定義RTP與SIP協議)，NPL的語法與Java/C相似。JNetStream還提供一個NPL語言調試器。

package org.jnetstream.example;

import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.jnetpcap.packet.JMemoryPacket;
import org.jnetpcap.packet.PeeringException;
import org.jnetpcap.protocol.JProtocol;
import org.jnetstream.capture.Captures;
import org.jnetstream.capture.FileFormatException;
import org.jnetstream.capture.FileMode;
import org.jnetstream.capture.file.RecordIndexer;
import org.jnetstream.capture.file.pcap.PcapFile;
import org.jnetstream.capture.file.pcap.PcapRecord;
/**

A little test program to see what it would take to use jNetPcap to decode
jNetStream read packets. We take a pcap capture file, open it for read-write
with memory mapping so that we can peer natively with the underlying data.

@author Mark Bednarczyk
@author Sly Technologies, Inc.
*/
public class DecodeUsingJNetPcap {
/**

Entry point.

@param args
ignored
*/
public static void main(String[] args) {
try {
PcapFile pcap =
Captures.openFile(PcapFile.class, new File("tests/test-l2tp.pcap"),

FileMode.ReadWriteWithMap);


RecordIndexer records = pcap.getRecordIndexer();
long count = pcap.getPacketCount();
for (long i = 1; i < count; i++) {
PcapRecord record = records.get(i);
ByteBuffer b = record.getRecordBuffer();
JMemoryPacket packet = new JMemoryPacket(JProtocol.ETHERNET_ID, b);
System.out.println(packet);
}
pcap.close();
} catch (FileFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (PeeringException e) {
e.printStackTrace();
}
}
}</pre> 


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