Messenger/Versions/Less Closed Beta/v4.0/MSGer.tk/ICMPPacket.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
namespace MSGer.tk
{
public static class ICMPPacket
{
public const byte Type = ICMP_ECHO;
public const byte SubCode = 0;
public const byte RespType = ICMP_TIME_EXCEEDED;
public const byte RespCode = 1;
public const UInt16 CheckSum = 0;
public const UInt16 Identifier = 52;
public const UInt16 SequenceNumber = 84;
public static readonly byte[] Data = Encoding.Unicode.GetBytes("MSGer.tk connection");
public const byte ICMP_ECHO = 8;
public const byte ICMP_REPLY = 0;
public const byte ICMP_TIME_EXCEEDED = 11;
public static byte[] CreateRequest() //2015.02.05.
{
var data = new List<byte>();
data.Add(Type);
data.Add(SubCode);
data.AddRange(BitConverter.GetBytes(CheckSum));
data.AddRange(BitConverter.GetBytes(Identifier));
data.AddRange(BitConverter.GetBytes(SequenceNumber));
data.AddRange(Data);
return data.ToArray();
}
public static byte[] CreateReply()
{
//ICMPPacket packet = new ICMPPacket();
var data = new List<byte>();
data.Add(RespType);
data.Add(RespCode);
data.AddRange(BitConverter.GetBytes(CheckSum));
data.AddRange(BitConverter.GetBytes((int)0)); //4 bytes unused
data.AddRange(CreateRequest()); //Original packet
return data.ToArray();
}
public static bool IsPacketGood(byte[] bytes)
{
return (bytes[0] == ICMP_TIME_EXCEEDED);
}
}
}