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/*
C# Network Programming
by Richard Blum
Publisher: Sybex
ISBN: 0782141765
*/
using System;
using System.Drawing;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;
public class AdvPing : Form
{
private static int pingstart, pingstop, elapsedtime;
private static TextBox hostbox, databox;
private static ListBox results;
private static Thread pinger;
private static Socket sock;
public AdvPing()
{
Text = "Advanced Ping Program";
Size = new Size(400, 380);
Label label1 = new Label();
label1.Parent = this;
label1.Text = "Enter host to ping:";
label1.AutoSize = true;
label1.Location = new Point(10, 30);
hostbox = new TextBox();
hostbox.Parent = this;
hostbox.Size = new Size(200, 2 * Font.Height);
hostbox.Location = new Point(10, 55);
results = new ListBox();
results.Parent = this;
results.Location = new Point(10, 85);
results.Size = new Size(360, 18 * Font.Height);
Label label2 = new Label();
label2.Parent = this;
label2.Text = "Packet data:";
label2.AutoSize = true;
label2.Location = new Point(10, 330);
databox = new TextBox();
databox.Parent = this;
databox.Text = "test packet";
databox.Size = new Size(200, 2 * Font.Height);
databox.Location = new Point(80, 325);
Button sendit = new Button();
sendit.Parent = this;
sendit.Text = "Start";
sendit.Location = new Point(220,52);
sendit.Size = new Size(5 * Font.Height, 2 * Font.Height);
sendit.Click += new EventHandler(ButtonSendOnClick);
Button stopit = new Button();
stopit.Parent = this;
stopit.Text = "Stop";
stopit.Location = new Point(295,52);
stopit.Size = new Size(5 * Font.Height, 2 * Font.Height);
stopit.Click += new EventHandler(ButtonStopOnClick);
Button closeit = new Button();
closeit.Parent = this;
closeit.Text = "Close";
closeit.Location = new Point(300, 320);
closeit.Size = new Size(5 * Font.Height, 2 * Font.Height);
closeit.Click += new EventHandler(ButtonCloseOnClick);
sock = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3000);
}
void ButtonSendOnClick(object obj, EventArgs ea)
{
pinger = new Thread(new ThreadStart(sendPing));
pinger.IsBackground = true;
pinger.Start();
}
void ButtonStopOnClick(object obj, EventArgs ea)
{
pinger.Abort();
}
void ButtonCloseOnClick(object obj, EventArgs ea)
{
sock.Close();
Close();
}
void sendPing()
{
IPHostEntry iphe = Dns.Resolve(hostbox.Text);
IPEndPoint iep = new IPEndPoint(iphe.AddressList[0], 0);
EndPoint ep = (EndPoint)iep;
ICMP packet = new ICMP();
int recv, i = 1;
packet.Type = 0x08;
packet.Code = 0x00;
Buffer.BlockCopy(BitConverter.GetBytes(1), 0, packet.Message, 0, 2);
byte[] data = Encoding.ASCII.GetBytes(databox.Text);
Buffer.BlockCopy(data, 0, packet.Message, 4, data.Length);
packet.MessageSize = data.Length + 4;
int packetsize = packet.MessageSize + 4;
results.Items.Add("Pinging " + hostbox.Text);
while(true)
{
packet.Checksum = 0;
Buffer.BlockCopy(BitConverter.GetBytes(i), 0, packet.Message, 2, 2);
UInt16 chcksum = packet.getChecksum();
packet.Checksum = chcksum;
pingstart = Environment.TickCount;
sock.SendTo(packet.getBytes(), packetsize, SocketFlags.None, iep);
try
{
data = new byte[1024];
recv = sock.ReceiveFrom(data, ref ep);
pingstop = Environment.TickCount;
elapsedtime = pingstop - pingstart;
results.Items.Add("reply from: " + ep.ToString() + ", seq: " + i +
", time = " + elapsedtime + "ms");
} catch (SocketException)
{
results.Items.Add("no reply from host");
}
i++;
Thread.Sleep(3000);
}
}
public static void Main()
{
Application.Run(new AdvPing());
}
}
class ICMP
{
public byte Type;
public byte Code;
public UInt16 Checksum;
public int MessageSize;
public byte[] Message = new byte[1024];
public ICMP()
{
}
public ICMP(byte[] data, int size)
{
Type = data[20];
Code = data[21];
Checksum = BitConverter.ToUInt16(data, 22);
MessageSize = size - 24;
Buffer.BlockCopy(data, 24, Message, 0, MessageSize);
}
public byte[] getBytes()
{
byte[] data = new byte[MessageSize + 9];
Buffer.BlockCopy(BitConverter.GetBytes(Type), 0, data, 0, 1);
Buffer.BlockCopy(BitConverter.GetBytes(Code), 0, data, 1, 1);
Buffer.BlockCopy(BitConverter.GetBytes(Checksum), 0, data, 2, 2);
Buffer.BlockCopy(Message, 0, data, 4, MessageSize);
return data;
}
public UInt16 getChecksum()
{
UInt32 chcksm = 0;
byte[] data = getBytes();
int packetsize = MessageSize + 8;
int index = 0;
while ( index < packetsize)
{
chcksm += Convert.ToUInt32(BitConverter.ToUInt16(data, index));
index += 2;
}
chcksm = (chcksm >> 16) + (chcksm & 0xffff);
chcksm += (chcksm >> 16);
return (UInt16)(~chcksm);
}
}
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