Network.java

Network.java

import java.util.Scanner;
class Network{
	// ip method
	public void ip(String newString){
			
		// make a position of each string
		int numberPosition[] = new int[newString.length()];
		for(int i=0;i<=newString.length()-1;i++){
			numberPosition[i] = Character.getNumericValue(newString.charAt(i));
		}
		
		// type of field that we use to calculate and show to user
		int version = numberPosition[0];
		int HeaderLength = numberPosition[0]*numberPosition[1];
		int totalLength = (int)(numberPosition[4]*4096 + numberPosition[5]*256 + numberPosition[6]*16 + numberPosition[7]*1);
		String identification = "0x"+newString.charAt(8)+newString.charAt(9)+newString.charAt(10)+newString.charAt(11);
		int timeToLive = (int)(numberPosition[16]*16 + (numberPosition[17]*1));
		int Protocol = (int)(numberPosition[19]*1);
		String headerCheckSum = "0x"+newString.charAt(20)+newString.charAt(21)+newString.charAt(22)+newString.charAt(23);
		int sourceIP1 = (int)(numberPosition[24]*16 + (numberPosition[25]*1));
		int sourceIP2 = (int)(numberPosition[26]*16 + (numberPosition[27]*1));
		int sourceIP3 = (int)(numberPosition[28]*16 + (numberPosition[29]*1));
		int sourceIP4 = (int)(numberPosition[30]*16 + (numberPosition[31]*1));
		int destinationIP1 = (int)(numberPosition[32]*16 + (numberPosition[33]*1));
		int destinationIP2 = (int)(numberPosition[34]*16 + (numberPosition[35]*1));
		int destinationIP3 = (int)(numberPosition[36]*16 + (numberPosition[37]*1));
		int destinationIP4 = (int)(numberPosition[38]*16 + (numberPosition[39]*1));
		
		// check protocol name
		String protoColName = "";
		if(Protocol == 4){
			protoColName = "(IPv4)";
		}else if(Protocol==6){
			protoColName = "(TCP)";
		}else{
			protoColName = "";
		}
		
		// print output of each field 
		System.out.println("\n====================== IP Analyzer ======================");
		System.out.println("\n\tVersion \t\t: " + version);
		System.out.println("\tHeader Length \t\t: " + HeaderLength);
		System.out.println("\tTotal Length \t\t: " + totalLength);
		System.out.println("\tIdentification \t\t: " + identification);
		System.out.println("\tTime to Live \t\t: " + timeToLive);
		System.out.println("\tProtocol \t\t: " + Protocol + protoColName);
		System.out.println("\tHeader Checksum \t: " + headerCheckSum);
		System.out.println("\tSource IP \t\t: " +sourceIP1 +"."+ sourceIP2 +"."+ sourceIP3 +"."+ sourceIP4);
		System.out.println("\tDestination IP \t\t: " +destinationIP1 +"."+ destinationIP2 +"."+ destinationIP3 +"."+ destinationIP4);
	}
	// tcp method
	public void tcp(String newString){
		
		// make a position of each string
		int numberPosition[] = new int[newString.length()];
		for(int i=0;i<=newString.length()-1;i++){
			numberPosition[i] = Character.getNumericValue(newString.charAt(i));
		}
		
		// type of field that we use to calculate and show to user
		int soucePortTCP = (int)(numberPosition[40]*4096 + numberPosition[41]*256 + numberPosition[42]*16 + numberPosition[43]*1);
		int destinationPortTCP = (int)(numberPosition[44]*4096 + numberPosition[45]*256 + numberPosition[46]*16 + numberPosition[47]*1);
		long sequenceNumber = (long)(numberPosition[48]*Math.pow(16, 7) + numberPosition[49]*Math.pow(16, 6) + numberPosition[50]*Math.pow(16, 5) + numberPosition[51]*Math.pow(16, 4) + numberPosition[52]*Math.pow(16, 3) + numberPosition[53]*Math.pow(16, 2) + numberPosition[54]*16 + numberPosition[55]*1);
		long acknowledgeMentNumber = (long)(numberPosition[56]*Math.pow(16, 7) + numberPosition[57]*Math.pow(16, 6) + numberPosition[58]*Math.pow(16, 5) + numberPosition[59]*Math.pow(16, 4) + numberPosition[60]*Math.pow(16, 3) + numberPosition[61]*Math.pow(16, 2) + numberPosition[62]*16 + numberPosition[63]*1);
		int headerLength = (int)(numberPosition[64]*4);
		String flag = "0x"+numberPosition[65]+numberPosition[66]+numberPosition[67];
		String checkSumTCP = "0x"+newString.charAt(72)+newString.charAt(73)+newString.charAt(74)+newString.charAt(75);
		int windowSizeValue = (int)(numberPosition[68]*4096 + numberPosition[69]*256 + numberPosition[70]*16 + numberPosition[71]*1);
		int flagPositionOne = Character.getNumericValue(flag.charAt(3));
		int flagPositionTwo = Character.getNumericValue(flag.charAt(4));
		String flagName = null;
		String destinationPortName,sourcePortName = "";
		
		// check port to print out.
		if(soucePortTCP==80){
			sourcePortName = " (https)";
		}else if(soucePortTCP==443){
			sourcePortName = " (http)";
		}else{
			sourcePortName = "";
		}
		
		// check port to print out.
		if(destinationPortTCP==80){
			destinationPortName = " (https)";
		}else if(destinationPortTCP==443){
			destinationPortName = " (http)";
		}else{
			destinationPortName = "";
		}
		
		// check flag
		if(flagPositionOne==1 && flagPositionTwo==0){
			flagName = " (ACK)";
		}else if(flagPositionOne==0 && flagPositionTwo==1){
			flagName = " (FIN)";
		}else if(flagPositionOne==0 && flagPositionTwo==2){
			flagName = " (SYN)";
		}else if(flagPositionOne==0 && flagPositionTwo==4){
			flagName = " (RST)";
		}else if(flagPositionOne==1 && flagPositionTwo==1){
			flagName = " (FIN, ACK)";
		}else if(flagPositionOne==1 && flagPositionTwo==2){
			flagName = " (SYN, ACK)";
		}else if(flagPositionOne==1 && flagPositionTwo==4){
			flagName = " (RST, ACK)";
		}else if(flagPositionOne==1 && flagPositionTwo==8){
			flagName = " (PSH, ACK)";
		}else if(flagPositionOne==2 && flagPositionTwo==1){
			flagName = " (FIN, URG)";
		}else if(flagPositionOne==2 && flagPositionTwo==2){
			flagName = " (SYN, URG)";
		}else if(flagPositionOne==2 && flagPositionTwo==4){
			flagName = " (RSP, URG)";
		}else if(flagPositionOne==2 && flagPositionTwo==4){
			flagName = " (PSH, URG)";
		}
		
		// print output of each field 
		System.out.println("\n====================== TCP Analyzer ======================");
		System.out.println("\n\tSource Port \t\t: " + soucePortTCP + sourcePortName);
		System.out.println("\tDestination Port \t: " + destinationPortTCP + destinationPortName);
		System.out.println("\tSequence Number\t\t: " + sequenceNumber);
		System.out.println("\tAcknowledgement Number\t: " + acknowledgeMentNumber);
		System.out.println("\tHeader Length \t\t: " + headerLength + " bytes");
		System.out.println("\tFlag \t\t\t: " + flag + "" + flagName);
		System.out.println("\tWindow Size Value \t: " + windowSizeValue);
		System.out.println("\tCheck Sum \t\t: " + checkSumTCP);
	}
	
	public static void main(String[] args){
	
		// create onject called network
		Network nwtwork = new Network();	
		Scanner kb = new Scanner(System.in);
		
		// input from keyboard
		System.out.print("Enter Hexadecimal : ");
		// input to HEX
		String HEX = kb.nextLine();
		
		// try to get input that have space to
		String[] SplitedString = HEX.split("\\s");
		String newString = "";
		
		// try to connect new string
		for(int i=0;i<SplitedString.length;i++){
			newString = newString+SplitedString[i];
		}
		
		// check character that in a-f or A-F or 0-9 or not.
		if(HEX.matches("[a-fA-F0-9]+")){
			// check length of header
			if(HEX.length()<80){
				System.out.println("Header should more than 80 characters");
				main(args);
			}else{
				// calculate 2 values
				nwtwork.ip(HEX);
				nwtwork.tcp(HEX);
			}
		}else{
			// try to call main() again
			System.out.println("Please enter set of characters between A-F or number 0-9");
			main(args);
		}
	}
}