/// This method gets the packet and calculates the total size
/// of the packet by converting it to byte array
public static Int32 Serialize(IcmpPacket packet,
Byte [] Buffer, Int32 PacketSize, Int32 PingData)
{
Int32 cbReturn = 0;
// Serialize the struct into the array
int Index = 0;
Byte [] b_type = new Byte[1];
b_type[0] = (packet.Type);
Byte [] b_code = new Byte[1];
b_code[0] = (packet.SubCode);
Byte [] b_cksum = BitConverter.GetBytes(packet.CheckSum);
Byte [] b_id = BitConverter.GetBytes(packet.Identifier);
Byte [] b_seq = BitConverter.GetBytes(packet.SequenceNumber);
// Serialize type
Array.Copy(b_type, 0, Buffer, Index, b_type.Length);
Index += b_type.Length;
// Serialize subcode
Array.Copy(b_code, 0, Buffer, Index, b_code.Length);
Index += b_code.Length;
// Serialize cksum
Array.Copy(b_cksum, 0, Buffer, Index, b_cksum.Length);
Index += b_cksum.Length;
// Serialize id
Array.Copy(b_id, 0, Buffer, Index, b_id.Length);
Index += b_id.Length;
Array.Copy(b_seq, 0, Buffer, Index, b_seq.Length);
Index += b_seq.Length;
// Copy the data
Array.Copy(packet.Data, 0, Buffer, Index, PingData);
Index += PingData;
if (Index != PacketSize /* sizeof(IcmpPacket) */)
{
cbReturn = -1;
return(cbReturn);
}
cbReturn = Index;
return(cbReturn);
}
public static void TraceHost(string host)
{
// Declare the IPHostEntry
IPHostEntry serverHE, fromHE;
int nBytes = 0;
int dwStart = 0, dwStop = 0;
//Initialize a Socket of the Type ICMP
Socket socket = new
Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
// Get the server endpoint
try
{
serverHE = Dns.GetHostByName(host);
}
catch (Exception)
{
Console.WriteLine("Host not found");
return;
}
// Convert the server IP_EndPoint to an EndPoint
IPEndPoint ipepServer = new
IPEndPoint(serverHE.AddressList[0], 0);
EndPoint epServer = (ipepServer);
// Set the receiving endpoint to the client machine
fromHE = Dns.GetHostByName(Dns.GetHostName());
IPEndPoint ipEndPointFrom = new
IPEndPoint(fromHE.AddressList[0], 0);
EndPoint EndPointFrom = (ipEndPointFrom);
int PacketSize = 0;
IcmpPacket packet = new IcmpPacket();
// Construct the packet to send
packet.Type = 8; //8
packet.SubCode = 0;
packet.CheckSum = UInt16.Parse("0");
packet.Identifier = UInt16.Parse("45");
packet.SequenceNumber = UInt16.Parse("0");
int PingData = 32; // sizeof(IcmpPacket) - 8;
packet.Data = new Byte[PingData];
// Initialize the Packet.Data
for (int i = 0; i < PingData; i++)
{
packet.Data[i] = (byte)'#';
}
// Variable to hold the total packet size
PacketSize = PingData + 8;
Byte [] icmp_pkt_buffer = new Byte[PacketSize];
Int32 Index = 0;
// the total number of bytes in the packet
Index = Serialize(packet,
icmp_pkt_buffer,
PacketSize,
PingData);
// Error in packet size
if (Index == -1)
{
Console.WriteLine("Error in Making Packet");
return;
}
for (int ittl = 1; ittl <= 256; ittl++)
{
Byte[] ByteRecv = new Byte[256];
// Socket options to set TTL and Timeouts
socket.SetSocketOption(SocketOptionLevel.IP,
SocketOptionName.IpTimeToLive, ittl);
socket.SetSocketOption(SocketOptionLevel.Socket,
SocketOptionName.SendTimeout, 10000);
socket.SetSocketOption(SocketOptionLevel.Socket,
SocketOptionName.ReceiveTimeout, 10000);
// Get current time
DateTime dt = DateTime.Now;
// Send request
int iRet = socket.SendTo(icmp_pkt_buffer,
icmp_pkt_buffer.Length, SocketFlags.None,
epServer);
// Check for Win32 SOCKET_ERROR
if (iRet == -1)
{
Console.WriteLine("error sending data");
}
// Receive
iRet = socket.ReceiveFrom(ByteRecv, ByteRecv.Length,
SocketFlags.None, ref EndPointFrom);
// Calculate time required
TimeSpan ts = DateTime.Now - dt;
// Check if response is OK
if (iRet == -1)
{
Console.WriteLine("error getting data");
}
Console.WriteLine("TTL= {0,-5} IP= {1,-20}Time={2,3}ms", ittl, ((IPEndPoint)epServer)
.Address, ts.Milliseconds);
if ((iRet == 32 + 8 + 20) &&
(BitConverter.ToInt16(ByteRecv, 24) ==
BitConverter.ToInt16(icmp_pkt_buffer, 4)) &&
(ByteRecv[20] == 0))
{
break;
}
// Time out
if (ByteRecv[20] != 11)
{
Console.WriteLine("Unexpected Error");
break;
}
}
// Close the socket
socket.Close();
}
/// This method takes the hostname of the server
/// and then it pings it and shows the response time
public static void PingHost(string host)
{
// Declare the IPHostEntry
IPHostEntry serverHE, fromHE;
int nBytes = 0;
int dwStart = 0, dwStop = 0;
// Initialize a socket of the type ICMP
Socket socket = new Socket(AddressFamily.InterNetwork,
SocketType.Raw, ProtocolType.Icmp);
// Get the server endpoint
try
{
serverHE = Dns.GetHostByName(host);
}
catch (Exception)
{
Console.WriteLine("Host not found"); // fail
return;
}
// Convert the server IP_EndPoint to an EndPoint
IPEndPoint ipepServer = new
IPEndPoint(serverHE.AddressList[0], 0);
EndPoint epServer = (ipepServer);
// Set the receiving endpoint to the client machine
fromHE = Dns.GetHostByName(Dns.GetHostName());
IPEndPoint ipEndPointFrom = new
IPEndPoint(fromHE.AddressList[0], 0);
EndPoint EndPointFrom = (ipEndPointFrom);
int PacketSize = 0;
IcmpPacket packet = new IcmpPacket();
// Construct the packet to send
packet.Type = 8;
packet.SubCode = 0;
packet.CheckSum = UInt16.Parse("0");
packet.Identifier = UInt16.Parse("45");
packet.SequenceNumber = UInt16.Parse("0");
int PingData = 32; // sizeof(IcmpPacket) - 8;
packet.Data = new Byte[PingData];
// Initialize the Packet.Data
for (int i = 0; i < PingData; i++)
{
packet.Data[i] = (byte)'#';
}
// Variable to hold the total packet size
PacketSize = PingData + 8;
Byte [] icmp_pkt_buffer = new Byte[PacketSize];
Int32 Index = 0;
// Call the Serialize method you built earlier which
// counts the total number of bytes in the packet
Index = Serialize(packet,
icmp_pkt_buffer,
PacketSize,
PingData);
if (Index == -1)
{
// Error in packet size
Console.WriteLine("Error in Making Packet");
return;
}
// Now get this critter into a UInt16 array
// Get the half size of the packet
Double double_length = Convert.ToDouble(Index);
Double dtemp = System.Math.Ceiling(double_length / 2);
int cksum_buffer_length = Convert.ToInt32(dtemp);
// Create a byte array
UInt16 [] cksum_buffer = new UInt16[cksum_buffer_length];
// Code to initialize the Uint16 array
int icmp_header_buffer_index = 0;
for (int i = 0; i < cksum_buffer_length; i++)
{
cksum_buffer[i] = BitConverter.ToUInt16
(icmp_pkt_buffer, icmp_header_buffer_index);
icmp_header_buffer_index += 2;
}
// Call the checksum method you built, which will
// return a checksum
UInt16 u_cksum = checksum(cksum_buffer, cksum_buffer_length);
// Save the checksum to the Packet
packet.CheckSum = u_cksum;
// Now that you have the checksum, serialize the packet again
Byte [] sendbuf = new Byte[PacketSize];
// Again check the packet size
Index = Serialize(packet,
sendbuf,
PacketSize,
PingData);
// If there is a error report it
if (Index == -1)
{
Console.WriteLine("Error in Making Packet");
return;
}
// Start timing
dwStart = System.Environment.TickCount;
// Send the packet over the socket
try
{
if ((nBytes = socket.SendTo(sendbuf,
PacketSize, 0, epServer)) == -1)
{
Console.WriteLine("Socket Error cannot Send Packet");
}
}
// Gracefully handle host unreachable situations
catch (SocketException ex)
{
if (ex.ErrorCode == 10065)
{
Console.WriteLine("Destination host unreachable.");
}
}
// Initialize the buffers.
// The receive buffer is the size of the
// ICMP header plus the IP header (20 bytes)
Byte [] ReceiveBuffer = new Byte[256];
nBytes = 0;
// Receive the bytes
bool recd = false;
int timeout = 0;
// Loop for checking the time of the server responding
while (!recd)
{
nBytes = socket.ReceiveFrom
(ReceiveBuffer, 256, 0, ref EndPointFrom);
if (nBytes == -1)
{
Console.WriteLine("Host not responding");
recd = true;
break;
}
else if (nBytes > 0)
{
// Stop timing
dwStop = System.Environment.TickCount - dwStart;
Console.WriteLine("Reply from "
+ epServer.ToString() + " in "
+ dwStop + "ms :Bytes Received: " + nBytes);
recd = true;
break;
}
// Time out check
timeout = System.Environment.TickCount - dwStart;
if (timeout > 1000)
{
Console.WriteLine("Time Out");
recd = true;
}
}
// Close the socket
socket.Close();
}
