在Java中用Jpcap捕获网络包
作者:渠上明月 提交日期:2005-12-23 13:40:00
如果你想捕获Java程序中的网络包,那么你需要一些辅助工具,因为核心Java API不能访问底层的网络数据。但Jpcap是一种提供在Windows或UNIX系统上进行这种访问的Java API。
Jpcap不是一种纯粹的Java解决方案;它依赖本地库的使用。在Windows 或 UNIX上,你必须有必要的第三方库,分别是WinPcap或libpcap。
Jpcap的工作原理
Jpcap使用一个事件模型来让你处理包。首先你必须创建一个执行接口jpcap.JpcapHandler的类。
public class JpcapTip implements JpcapHandler {
public void handlePacket(Packet packet){
System.out.println(packet);
}
}
为了捕获包,你需要告诉Jpcap你想用哪个网络设备来监听。API提供了jpcap.Jpcap.getDeviceList()方法以满足这一目的。这个方法返回一列字符串,你可以象如下使用它:
String[] devices = Jpcap.getDeviceList();
一旦你有了一个设备名称的目录,你必须选取一个用来监听:
String deviceName = devices[0];
选择一个设备之后,通过Jpcap.openDevice()方法打开它。openDevice()方法需要四个参数:即将打开的设备名,从设备上一次读取的最大字节数,说明是否将设备设为混杂模式的Boolean值,和以后调用processPacket()方法要使用到的超时值。
Jpcapjpcap = Jpcap.openDevice(deviceName, 1028, false, 10000);
openDevice()方法将一个参数返回到用以捕获的Jpcap对象。既然有了Jpcap实例,你可以调用processPacket() 或loopPacket()开始监听了。这两种方式都带有两个参数:捕获的最大包数可以是-1(说明没有限制);执行JpcapHandler的一个类的实例。
如果你调用processPacket(),那么Jpcap将一直捕获包,直到超过openDevice中规定的时限或达到了规定的最大包数。loopPacket()则将一直捕获包,直到达到最大包数,如果没有最大数限制,它将永远运行下去。就像下面这样调用:
jpcap.loopPacket(-1, new JpcapTip());
下面则是全部测试类的代码:
import jpcap.JpcapHandler;
import jpcap.Jpcap;
import jpcap.Packet;
public class JpcapTip implements JpcapHandler {
public void handlePacket(Packet packet){
System.out.println(packet);
}
public static void main(String[] args) throws java.io.IOException{
String[] devices = Jpcap.getDeviceList();
for (inti = 0; i < devices.length; i++) {
System.out.println(devices[i]);
}
String deviceName = devices[0];
Jpcapjpcap = Jpcap.openDevice(deviceName, 1028, false, 1);
jpcap.loopPacket(-1, new JpcapTip());
}
}
为了执行这个类,你必须确保虚拟机可以找到Jpcap的本地库。在Window上,如果jpcap.dll在库地址目录中,Java命令如下:
java -Djava.library.path=lib -cp lib\jpcap.jar;. JpcapTip
执行测试类的输出则如下(出于篇幅考虑进行了缩减):
ARP REQUEST 00:06:5b:01:b2:4d(192.168.15.79)
00:00:00:00:00:00(192.168.15.34)
ARP REQUEST 00:06:5b:01:b2:4d(192.168.15.79)
00:00:00:00:00:00(192.168.15.34)
1052251329:525479 192.168.15.103->255.255.255.255 protocol(17) priority(0)
hop(
offset(0) ident(59244) UDP 1211 1211
...
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