package ns.tcphack;

class MyTcpHandler extends TcpHandler {
	public static void main(String[] args) {
		new MyTcpHandler();
	}

	public MyTcpHandler() {
		super();

		boolean done = false;

		// array of bytes in which we're going to build our packet:
		int[] txpkt = new int[68];		// 40 bytes long for now, may need to expand this later

		txpkt[0] = 0x60;	// first byte of the IPv6 header contains version number in upper nibble
		// add our traffic class to the same byte
//		txpkt[0] = txpkt[0] | 0x00;
//		the rest of traffic class
		txpkt[1] = 0x00;
//		flow label
		txpkt[2] = 0x00;
		txpkt[3] = 0x00;

//		payload length
		txpkt[4] = 0x00;
		txpkt[5] = 0x1c;

//		next header (type TCP is 6)
		txpkt[6] = 0x06;
//		hop limit 64
		txpkt[7] = 0x40;

//		Our source IP:
//		2001:67c:2564:a309:f91c:f77c:9c2f:24ed
//		Split this up into 16 array elements:
		txpkt[8] = 0x20;
		txpkt[9] = 0x01;
		txpkt[10] = 0x06;
		txpkt[11] = 0x7c;
		txpkt[12] = 0x25;
		txpkt[13] = 0x64;
		txpkt[14] = 0xa3;
		txpkt[15] = 0x09;
		txpkt[16] = 0xf9;
		txpkt[17] = 0x1c;
		txpkt[18] = 0xf7;
		txpkt[19] = 0x7c;
		txpkt[20] = 0x9c;
		txpkt[21] = 0x2f;
		txpkt[22] = 0x24;
		txpkt[23] = 0xed;

//		Our destination IP:
// 		2001:67c:2564:a170:204:23ff:fede:4b2c
		txpkt[24] = 0x20;
		txpkt[25] = 0x01;
		txpkt[26] = 0x06;
		txpkt[27] = 0x7c;
		txpkt[28] = 0x25;
		txpkt[29] = 0x64;
		txpkt[30] = 0xa1;
		txpkt[31] = 0x70;
		txpkt[32] = 0x02;
		txpkt[33] = 0x04;
		txpkt[34] = 0x23;
		txpkt[35] = 0xff;
		txpkt[36] = 0xfe;
		txpkt[37] = 0xde;
		txpkt[38] = 0x4b;
		txpkt[39] = 0x2c;

//		TCP header
//		source port (we chose 6543)
		txpkt[40] = 0x19;
		txpkt[41] = 0x8f;

//		destination port (this depends on which one we're doing)
		txpkt[42] = 0x1e;
		txpkt[43] = 0x1e;

//		sequence number! initially choose 1
		txpkt[44] = 0x01;
		txpkt[45] = 0x00;
		txpkt[46] = 0x00;
		txpkt[47] = 0x00;

//		ack number! initially choose 0
		txpkt[48] = 0x00;
		txpkt[49] = 0x00;
		txpkt[50] = 0x00;
		txpkt[51] = 0x00;

//		data offset initially choose 0
		txpkt[52] = 0x50;
//		reserved (must be 0)
		//						 | FLAGS:  								   |
		//  Reserved:   (2 bits)     | urg  | ack  |  psh | rst  | syn  | fin |
		txpkt[53] = 0b00000010;

		// window
		txpkt[54] = 0xff;
		txpkt[55] = 0x00;

		// checksum
		txpkt[56] = 0x00;
		txpkt[57] = 0x00;

		// Urgent pointer
		txpkt[58] = 0x00;
		txpkt[59] = 0x00;

		// options
		txpkt[60] = 0x00;
		txpkt[61] = 0x00;
		txpkt[62] = 0x00;

		// Padding
		txpkt[63] = 0x00;

		// Data
		txpkt[64] = 0x00;
		txpkt[65] = 0x00;
		txpkt[66] = 0x00;
		txpkt[67] = 0x00;

		this.sendData(txpkt);	// send the packet

		while (!done) {
			// check for reception of a packet, but wait at most 500 ms:
			int[] rxpkt = this.receiveData(500);
			if (rxpkt.length==0) {
				// nothing has been received yet
				System.out.println("Nothing...");
				continue;
			}

			// something has been received
			int len=rxpkt.length;

			// print the received bytes:
			int i;
			System.out.print("Received "+len+" bytes: ");
			for (i=0;i<len;i++) System.out.print(rxpkt[i]+" ");
			System.out.println("");
		}
	}
}