/// <summary>
/// Convert Icmp package to array of bytes
/// </summary>
/// <param name="package"></param>
/// <returns>Array of bytes</returns>
public byte[] PackageToByteArray(IcmpPackage package)
{
byte[] data = new byte[package.MessageSize + 9];
Buffer.BlockCopy(BitConverter.GetBytes(package.Type), 0, data, 0, 1);
Buffer.BlockCopy(BitConverter.GetBytes(package.Code), 0, data, 1, 1);
Buffer.BlockCopy(BitConverter.GetBytes(package.Checksum), 0, data, 2, 2);
Buffer.BlockCopy(package.Message, 0, data, 4, package.MessageSize);
return(data);
}
/// <summary>
/// Convert array of bytes to Icmp package
/// </summary>
/// <param name="data"></param>
/// <param name="size"></param>
/// <returns>Icmp Package</returns>
public IcmpPackage ByteArrayToPackage(byte[] data, int size)
{
IcmpPackage package = new IcmpPackage
{
Type = data[20],
Code = data[21],
Checksum = BitConverter.ToUInt16(data, 22),
MessageSize = size - 24
};
Buffer.BlockCopy(data, 24, package.Message, 0, package.MessageSize);
return(package);
}
public static void Main(string[] argv)
{
var remoteIPs = Dns.GetHostAddresses("www.google.com");
IPEndPoint ipEndPoint = new IPEndPoint(remoteIPs[0], 0);
EndPoint endPoint = (EndPoint)ipEndPoint;
IcmpPackageBuilder icmpBuilder = new IcmpPackageBuilder();
IcmpPackage icmpPackage = icmpBuilder.Build();
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3000);
icmpPackage.Checksum = icmpBuilder.CalculateChecksum(icmpPackage);
socket.SendTo(icmpBuilder.PackageToByteArray(icmpPackage), ipEndPoint);
int recv;
byte[] data = new byte[1024];
try
{
recv = socket.ReceiveFrom(data, ref endPoint);
}
catch (SocketException e)
{
Console.WriteLine(e.Message);
Console.ReadLine();
return;
}
Console.WriteLine("Response from: {0}", endPoint.ToString());
Console.WriteLine(" Type {0}", responsePackage.Type);
Console.WriteLine(" Code: {0}", responsePackage.Code);
int Sequence = BitConverter.ToInt16(responsePackage.Message, 2);
Console.WriteLine(" Identifier: {0}", responsePackage.Id);
Console.WriteLine(" Sequence: {0}", Sequence);
string stringData = Encoding.ASCII.GetString(responsePackage.Message, 4, responsePackage.MessageSize - 4);
Console.WriteLine(" Data: {0}", stringData);
Console.ReadLine();
socket.Close();
}
public UInt16 CalculateChecksum(IcmpPackage package)
{
UInt32 chcksm = 0;
byte[] data = this.PackageToByteArray(package);
int packetsize = package.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));
}
