资源简介

doc目录下有教程;lib目录下有jpcap.jar,jpcap.dll;sample目录下是示例程序;src目录下是源码。

资源截图

代码片段和文件信息

import java.net.Inet4Address;
import java.net.InetAddress;
import java.util.Arrays;

import jpcap.*;
import jpcap.packet.*;

public class ARP {
public static byte[] arp(InetAddress ip) throws java.io.IOException{
//find network interface
NetworkInterface[] devices=JpcapCaptor.getDeviceList();
NetworkInterface device=null;

loop: for(NetworkInterface d:devices){
for(NetworkInterfaceAddress addr:d.addresses){
if(!(addr.address instanceof Inet4Address)) continue;
byte[] bip=ip.getAddress();
byte[] subnet=addr.subnet.getAddress();
byte[] bif=addr.address.getAddress();
for(int i=0;i<4;i++){
bip[i]=(byte)(bip[i]&subnet[i]);
bif[i]=(byte)(bif[i]&subnet[i]);
}
if(Arrays.equals(bipbif)){
device=d;
break loop;
}
}
}

if(device==null)
throw new IllegalArgumentException(ip+“ is not a local address“);

//open Jpcap
JpcapCaptor captor=JpcapCaptor.openDevice(device2000false3000);
captor.setFilter(“arp“true);
JpcapSender sender=captor.getJpcapSenderInstance();

InetAddress srcip=null;
for(NetworkInterfaceAddress addr:device.addresses)
if(addr.address instanceof Inet4Address){
srcip=addr.address;
break;
}

byte[] broadcast=new byte[]{(byte)255(byte)255(byte)255(byte)255(byte)255(byte)255};
ARPPacket arp=new ARPPacket();
arp.hardtype=ARPPacket.HARDTYPE_ETHER;
arp.prototype=ARPPacket.PROTOTYPE_IP;
arp.operation=ARPPacket.ARP_REQUEST;
arp.hlen=6;
arp.plen=4;
arp.sender_hardaddr=device.mac_address;
arp.sender_protoaddr=srcip.getAddress();
arp.target_hardaddr=broadcast;
arp.target_protoaddr=ip.getAddress();

EthernetPacket ether=new EthernetPacket();
ether.frametype=EthernetPacket.ETHERTYPE_ARP;
ether.src_mac=device.mac_address;
ether.dst_mac=broadcast;
arp.datalink=ether;

sender.sendPacket(arp);

while(true){
ARPPacket p=(ARPPacket)captor.getPacket();
if(p==null){
throw new IllegalArgumentException(ip+“ is not a local address“);
}
if(Arrays.equals(p.target_protoaddrsrcip.getAddress())){
return p.sender_hardaddr;
}
}
}

public static void main(String[] args) throws Exception{
if(args.length<1){
System.out.println(“Usage: java ARP “);
}else{
byte[] mac=ARP.arp(InetAddress.getByName(args[0]));
for (byte b : mac)
System.out.print(Integer.toHexString(b&0xff) + “:“);
System.out.println();
System.exit(0);
}
}
}

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