SimplePing.cs

[เนติ นามวงศ์]

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class SimplePing
{
public static void Main (string[] argv)
{
byte[] data = new byte[1024];
int recv;
Socket host = new Socket(AddressFamily.InterNetwork,
SocketType.Raw,
ProtocolType.Icmp);
IPEndPoint iep = new IPEndPoint(IPAddress.Parse(argv[0]), 0);
EndPoint ep = (EndPoint)iep;
ICMP packet = new ICMP();
packet.Type = 0x08;
packet.Code = 0x00;
packet.Checksum = 0;
Buffer.BlockCopy(
BitConverter.GetBytes((short)1), 0, packet.Message, 0, 2);
Buffer.BlockCopy(
BitConverter.GetBytes((short)1), 0, packet.Message, 2, 2);
data = Encoding.ASCII.GetBytes("test packet");
Buffer.BlockCopy(data, 0, packet.Message, 4, data.Length);
packet.MessageSize = data.Length + 4;
int packetsize = packet.MessageSize + 4;
UInt16 chcksum = packet.getChecksum();
packet.Checksum = chcksum;
host.SetSocketOption(SocketOptionLevel.Socket,
SocketOptionName.ReceiveTimeout, 3000);
host.SendTo(packet.getBytes(), packetsize, SocketFlags.None, iep);
try
{
data = new byte[1024];
recv = host.ReceiveFrom(data, ref ep);
} catch (SocketException)
{
Console.WriteLine("No response from remote host");
return;
}
ICMP response = new ICMP(data, recv);
Console.WriteLine("response from: {0}", ep.ToString());
Console.WriteLine(" Type {0}", response.Type);
Console.WriteLine(" Code: {0}", response.Code);
int Identifier = BitConverter.ToInt16(response.Message, 0);
int Sequence = BitConverter.ToInt16(response.Message, 2);
Console.WriteLine(" Identifier: {0}", Identifier);
Console.WriteLine(" Sequence: {0}", Sequence);
string stringData = Encoding.ASCII.GetString(response.Message,
4, response.MessageSize - 4);
Console.WriteLine(" data: {0}", stringData);

host.Close();
}
}