as part of academic project write piece of code can generate fake udp response. doing using jnetpcap , here code:
public static void sendresponse() throws ioexception { system.out.println("generating fake response!"); try { string host = "fakeme.example.com"; int port = xxxx; //this port dns lookup service runs. byte[] message = "hello boyz !".getbytes(); // internet address of specified host inetaddress address; address = inetaddress.getbyname("77.**.**.**"); // initialize datagram packet data , address datagrampacket packet = new datagrampacket(message, message.length, address, port); // create datagram socket, send packet through it, close it. datagramsocket dsocket = new datagramsocket(); dsocket.send(packet); dsocket.close(); } catch (socketexception ex) { logger.getlogger(sniffer.class.getname()).log(level.severe, null, ex); } } it happens have service, when piece of code runs service should return value. in case fails.
where have screwed?
thanks.
additional information: piece of code calls is:
public static pcappackethandler<string> packet_handler(pcap pcap) { pcappackethandler<string> jpackethandler = new pcappackethandler<string>() { udp udp = new udp(); @override public void nextpacket(pcappacket packet, string user) { if (!packet.hasheader(udp)) { return; // not udp package, skip } try { system.out.println("fake response "); //send repsonse sendresponse(); } catch (ioexception ex) { logger.getlogger(sniffer.class.getname()).log(level.severe, null, ex); } } }; return jpackethandler; } please note: , running first , service (which dns lookup given web address check if spoofer working) in 2 terminal tabs. asked used port, put in port address of code. correct way it?
thanks again.
