Question

修改TCP数据包

将程序发送出去的数据包拦截后 进行修改 然后发送!
VB最好 VC也行. 希望提供代码 我需要代码 谢谢!
JAVA也可以啊 反正我能用就行 虽然不懂 可以学嘛

Answer 1

本程序用eclipse编辑在J2SDK6.0＋WinPcap 3.1＋Jpcap 0.5下编译运行

/*******************
* JpcapTip.java
*/
package m;

import jpcap.PacketReceiver;
import jpcap.JpcapCaptor;
import jpcap.packet.*;
import jpcap.NetworkInterface;
import jpcap.NetworkInterfaceAddress;
//import java.net.InetAddress;
//import java.net.UnknownHostException;

public class JpcapTip implements PacketReceiver {

public void receivePacket(Packet packet) {
System.out.println("********************************************");
/*IP数据报报文头*/
byte[] l=packet.header;
/*
for (int t=0;t<21;t++){
System.out.print(l[t]+" *** ");
}
*/
String str="";
System.out.print("报文头 : ");
for (int i=0;i<l.length;i++) {
//str=str+l;
int m=0;
m=l[i];
m=m<<24;
m=m>>>24;
str=str+Integer.toHexString(m);
//System.out.print(" *** "+l[i]);
}
System.out.println(str);
int d=l.length;
System.out.println("首部长度 ："+(d*8)+"bit");

/*分析源IP地址和目的IP地址*/
/*分析协议类型*/
/**
if(packet.getClass().equals(IPPacket.class)) {
IPPacket ipPacket=(IPPacket)packet;
byte[] iph=ipPacket.option;
String iphstr=new String(iph);
System.out.println(iphstr);
}
*/
if(packet.getClass().equals(ARPPacket.class))
{
System.out.println("协议类型 ：ARP协议");
try {
ARPPacket arpPacket = (ARPPacket)packet;
System.out.println("源网卡MAC地址为 ："+arpPacket.getSenderHardwareAddress());
System.out.println("源IP地址为 ："+arpPacket.getSenderProtocolAddress());
System.out.println("目的网卡MAC地址为 ："+arpPacket.getTargetHardwareAddress());
System.out.println("目的IP地址为 ："+arpPacket.getTargetProtocolAddress());

} catch( Exception e ) {
e.printStackTrace();
}
}
else
if(packet.getClass().equals(UDPPacket.class))
{
System.out.println("协议类型 ：UDP协议");
try {
UDPPacket udpPacket = (UDPPacket)packet;
System.out.println("源IP地址为 ："+udpPacket.src_ip);
int tport = udpPacket.src_port;
System.out.println("源端口为："+tport);
System.out.println("目的IP地址为 ："+udpPacket.dst_ip);
int lport = udpPacket.dst_port;
System.out.println("目的端口为："+lport);
} catch( Exception e ) {
e.printStackTrace();
}
}
else
if(packet.getClass().equals(TCPPacket.class)) {
System.out.println("协议类型 ：TCP协议");
try {
TCPPacket tcpPacket = (TCPPacket)packet;
int tport = tcpPacket.src_port;
System.out.println("源IP地址为 ："+tcpPacket.src_ip);
System.out.println("源端口为："+tport);
System.out.println("目的IP地址为 ："+tcpPacket.dst_ip);
int lport = tcpPacket.dst_port;
System.out.println("目的端口为："+lport);
} catch( Exception e ) {
e.printStackTrace();
}
}
else
if(packet.getClass().equals(ICMPPacket.class))
System.out.println("协议类型 ：ICMP协议");
else
System.out.println("协议类型 ：GGP、EGP、JGP协议或OSPF协议或ISO的第4类运输协议TP4");

/*IP数据报文数据*/
byte[] k=packet.data;
String str1="";
System.out.print("数据 : ");
for(int i=0;i<k.length;i++) {
//int m=0;
//m=k[i];
//m=m<<24;
//m=m>>>24;
//str1=str+Integer.toHexString(m);
str1 = new String(k);
//str1=str1+k[i];
//System.out.print(" *** "+k[i]);
}
System.out.println(str1);
System.out.println("数据报类型 : "+packet.getClass());

System.out.println("********************************************");
}

public static void main(String[] args) throws Exception{
// TODO 自动生成方法存根

NetworkInterface[] devices = JpcapCaptor.getDeviceList(); //.getDeviceList();.
//for (int i =0; i<devices.length;i++) {
int a=0;
//try {
/*本地网络信息*/
byte[] b=devices[1].mac_address; //网卡物理地址
//}
//catch() {}
System.out.print("网卡MAC : 00");
for (int j=0;j<b.length;j++){
//a=a<<8;
a=b[j];
a=a<<24;
a=a>>>24;
System.out.print(Integer.toHexString(a));
}
System.out.println();
NetworkInterfaceAddress[] k=devices[1].addresses;

//System.out.println("网卡MAC : "+Integer.toHexString(a));
for(int n=0;n<k.length;n++) {
System.out.println("本机IP地址 : "+k[n].address); //本机IP地址
System.out.println("子网掩码 : "+k[n].subnet); //子网掩码
}
System.out.println("网络连接类型 : "+devices[1].datalink_description);
//}
NetworkInterface deviceName = devices[1];
/*将网卡设为混杂模式下用网络设备deviceName*/
JpcapCaptor jpcap =JpcapCaptor.openDevice(deviceName, 2000, false, 1); //openDevice(deviceName,1028,false,1);
jpcap.loopPacket(-1,new JpcapTip());
}

Answer 2

唉

没啥用处

Answer 3

什么东西啊~~~~~~
别学了~~~~~
晕~~~~