Java Socket network Interception

This program is compiled and run in j2sdk6.0 + Winpcap 3.1 + jpcap 0.5 by using eclipse.

/*******************
* 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 ){
System. out. println ("************************************* *******");
/* IP datagram packet header */
Byte [] L = packet. header;
/*
For (int t = 0; t <21; t ++ ){
System. Out. Print (L [T] + "***");
}
*/
String STR = "";
System. Out. Print ("packet header :");
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 ("Header Length:" + (D * 8) + "bit ");

/* Analyze the source IP address and destination IP address */
/* Analyze the protocol type */
/**
If (packet. getclass (). Equals (ippacket. Class )){
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 ("protocol type: ARP Protocol ");
Try {
Arppacket = (arppacket) packet;
System. Out. println ("Source Nic MAC address:" + arppacket. getsenderhardwareaddress ());
System. Out. println ("Source IP Address:" + arppacket. getsenderprotocoladdress ());
System. Out. println ("target Nic MAC address:" + arppacket. gettargethardwareaddress ());
System. Out. println ("Destination IP Address:" + arppacket. gettargetprotocoladdress ());


} Catch (exception e ){
E. printstacktrace ();
}
}
Else
If (packet. getclass (). Equals (udppacket. Class ))
{
System. Out. println ("protocol type: UDP ");
Try {
Udppacket = (udppacket) packet;
System. Out. println ("Source IP Address:" + udppacket. src_ip );
Int tport = udppacket. src_port;
System. Out. println ("Source Port:" + tport );
System. Out. println ("Destination IP Address:" + udppacket. dst_ip );
Int lport = udppacket. dst_port;
System. Out. println ("Destination Port:" + lport );
} Catch (exception e ){
E. printstacktrace ();
}
}
Else
If (packet. getclass (). Equals (tcppacket. Class )){
System. Out. println ("protocol type: TCP ");
Try {
Tcppacket = (tcppacket) packet;
Int tport = tcppacket. src_port;
System. Out. println ("Source IP Address:" + tcppacket. src_ip );
System. Out. println ("Source Port:" + tport );
System. Out. println ("Destination IP Address:" + tcppacket. dst_ip );
Int lport = tcppacket. dst_port;
System. Out. println ("Destination Port:" + lport );
} Catch (exception e ){
E. printstacktrace ();
}
}
Else
If (packet. getclass (). Equals (icmppacket. Class ))
System. Out. println ("protocol type: ICMP ");
Else
System. Out. println ("protocol type: GGP, EGP, jgp, OSPF, or ISO Transport Protocol tp4 ");



/* IP data packet data */
Byte [] K = packet. Data;
String str1 = "";
System. Out. Print ("data :");
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 ("datagram type:" + packet. getclass ());

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

Public static void main (string [] ARGs) throws exception {
// Todo automatically generates method stubs

Networkinterface [] devices = jpcapcaptor. Getdevicelist (); //. Getdevicelist ();.
// For (INT I = 0; I <devices. length; I ++ ){
Int A = 0;
// Try {
/* Local network information */
Byte [] B = devices [1]. mac_address; // the physical address of the NIC.
//}
// Catch (){}
System. Out. Print ("Nic 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 ());
}
System. Out. println ();
Networkinterfaceaddress [] K = devices [1]. addresses;

// System. Out. println ("Nic Mac:" + integer. tohexstring ());
For (INT n = 0; n <K. length; n ++ ){
System. Out. println ("local IP Address:" + k [N]. Address); // local IP Address
System. Out. println ("subnet mask:" + k [N]. subnet); // Subnet Mask
}
System. Out. println ("network connection type:" + devices [1]. datalink_description );
//}
Networkinterface devicename = devices [1];
/* Set the NIC to devicename of the network device in mixed mode */
Jpcapcaptor jpcap = jpcapcaptor. opendevice (devicename, 2000, false, 1); // opendevice (devicename, 1028, false, 1 );
Jpcap. looppacket (-1, new jpcaptip ());
}

}

 

 

From: http://hi.baidu.com/wr5666/blog/item/a50e32cf03e34e3fb700c878.html