///ping.cs namespace SaurabhPing { using System; using System.Net; using System.Net.Sockets; /// <summary> /// 主要的类:ping /// </summary> class Ping { //声明几个常量 const int SOCKET_ERROR = -1; const int ICMP_ECHO = 8; /// <summary> /// 这里取得Hostname参数 /// </summary> public static void Main(string[] argv) { if(argv.Length==0) { //If user did not enter any Parameter inform him Console.WriteLine("Usage:Ping <hostname> /r") ; Console.WriteLine("<hostname> The name of the Host who you want to ping"); Console.WriteLine("/r Ping the host continuously") ; } else if(argv.Length==1) { //Just the hostname provided by the user //call the method "PingHost" and pass the HostName as a parameter PingHost(argv[0]) ; } else if(argv.Length==2) { //the user provided the hostname and the switch if(argv[1]=="/r") { //loop the ping program while(true) { //call the method "PingHost" and pass the HostName as a parameter PingHost(argv[0]) ; } } else { //if the user provided some other switch PingHost(argv[0]) ; } } else { //Some error occurred Console.WriteLine("Error in Arguments") ; } } /// <summary> /// 主要的方法,用来取得IP, /// 并计算响应时间 /// </summary> public static void PingHost(string host) { //Declare the IPHostEntry IPHostEntry serverHE, fromHE; int nBytes = 0; int dwStart = 0, dwStop = 0; //Initilize a Socket of the Type ICMP Socket socket = new Socket(AddressFamily.AfINet, SocketType.SockRaw, ProtocolType.ProtICMP); // 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 = ICMP_ECHO; //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]; //Initilize 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 a Method Serialize which counts //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 ; } // now get this critter into a UInt16 array //Get the Half size of the Packet Double double_length = Convert.ToDouble(Index); Double dtemp = Math.Ceil( 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 a method 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 we 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 ; } dwStart = System.Environment.TickCount; // Start timing //send the Pack over the socket if ((nBytes = socket.SendTo(sendbuf, PacketSize, 0, epServer)) == SOCKET_ERROR) { Console.WriteLine("Socket Error cannot Send Packet"); } // 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 == SOCKET_ERROR) { Console.WriteLine("Host not Responding") ; recd=true ; break; } else if(nBytes>0) { dwStop = System.Environment.TickCount - dwStart; // stop timing Console.WriteLine("Reply from "+epServer.ToString()+" in " +dwStop+"MS :Bytes Received"+nBytes); recd=true; break; } timeout=System.Environment.TickCount - dwStart; if(timeout>1000) { Console.WriteLine("Time Out") ; recd=true; } } //close the socket socket.Close(); } /// <summary> /// This method get the Packet and calculates the total size /// of the Pack by converting it to byte array /// </summary> 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); // Console.WriteLine("Serialize type "); Array.Copy( b_type, 0, Buffer, Index, b_type.Length ); Index += b_type.Length; // Console.WriteLine("Serialize code "); Array.Copy( b_code, 0, Buffer, Index, b_code.Length ); Index += b_code.Length; // Console.WriteLine("Serialize cksum "); Array.Copy( b_cksum, 0, Buffer, Index, b_cksum.Length ); Index += b_cksum.Length; // Console.WriteLine("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; } /// <summary> /// This Method has the algorithm to make a checksum /// </summary> public static UInt16 checksum( UInt16[] buffer, int size ) { Int32 cksum = 0; int counter; counter = 0; while ( size > 0 ) { UInt16 val = buffer[counter]; cksum += Convert.ToInt32( buffer[counter] ); counter += 1; size -= 1; } cksum = (cksum >> 16) + (cksum & 0xffff); cksum += (cksum >> 16); return (UInt16)(~cksum); } } // class ping /// <summary> /// Class that holds the Pack information /// </summary> public class IcmpPacket { public Byte Type; // type of message public Byte SubCode; // type of sub code public UInt16 CheckSum; // ones complement checksum of struct public UInt16 Identifier; // identifier public UInt16 SequenceNumber; // sequence number public Byte [] Data; } // class IcmpPacket }
namespace SaurabhPing
{
using System;
using System.Net;
using System.Net.Sockets;
/// <summary>
/// 主要的类:ping
/// </summary>
class Ping
{
//声明几个常量
const int SOCKET_ERROR = -1;
const int ICMP_ECHO = 8;
/// <summary>
/// 这里取得Hostname参数
/// </summary>
public static void Main(string[] argv)
{
if(argv.Length==0)
{
//If user did not enter any Parameter inform him
Console.WriteLine("Usage:Ping <hostname> /r") ;
Console.WriteLine("<hostname> The name of the Host who you want to ping");
Console.WriteLine("/r Ping the host continuously") ;
}
else if(argv.Length==1)
{
//Just the hostname provided by the user
//call the method "PingHost" and pass the HostName as a parameter
PingHost(argv[0]) ;
}
else if(argv.Length==2)
{
//the user provided the hostname and the switch
if(argv[1]=="/r")
{
//loop the ping program
while(true)
{
//call the method "PingHost" and pass the HostName as a parameter
PingHost(argv[0]) ;
}
}
else
{
//if the user provided some other switch
PingHost(argv[0]) ;
}
}
else
{
//Some error occurred
Console.WriteLine("Error in Arguments") ;
}
} /// <summary>
/// 主要的方法,用来取得IP,
/// 并计算响应时间
/// </summary>
public static void PingHost(string host)
{
//Declare the IPHostEntry
IPHostEntry serverHE, fromHE;
int nBytes = 0;
int dwStart = 0, dwStop = 0;
//Initilize a Socket of the Type ICMP
Socket socket =
new Socket(AddressFamily.AfINet, SocketType.SockRaw, ProtocolType.ProtICMP); // 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 = ICMP_ECHO; //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];
//Initilize 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 a Method Serialize which counts
//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 ;
} // now get this critter into a UInt16 array //Get the Half size of the Packet
Double double_length = Convert.ToDouble(Index);
Double dtemp = Math.Ceil( 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 a method 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 we 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 ;
}
dwStart = System.Environment.TickCount; // Start timing
//send the Pack over the socket
if ((nBytes = socket.SendTo(sendbuf, PacketSize, 0, epServer)) == SOCKET_ERROR)
{
Console.WriteLine("Socket Error cannot Send Packet");
}
// 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 == SOCKET_ERROR)
{
Console.WriteLine("Host not Responding") ;
recd=true ;
break;
}
else if(nBytes>0)
{
dwStop = System.Environment.TickCount - dwStart; // stop timing
Console.WriteLine("Reply from "+epServer.ToString()+" in "
+dwStop+"MS :Bytes Received"+nBytes);
recd=true;
break;
}
timeout=System.Environment.TickCount - dwStart;
if(timeout>1000)
{
Console.WriteLine("Time Out") ;
recd=true;
}
} //close the socket
socket.Close();
}
/// <summary>
/// This method get the Packet and calculates the total size
/// of the Pack by converting it to byte array
/// </summary>
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); // Console.WriteLine("Serialize type ");
Array.Copy( b_type, 0, Buffer, Index, b_type.Length );
Index += b_type.Length; // Console.WriteLine("Serialize code ");
Array.Copy( b_code, 0, Buffer, Index, b_code.Length );
Index += b_code.Length; // Console.WriteLine("Serialize cksum ");
Array.Copy( b_cksum, 0, Buffer, Index, b_cksum.Length );
Index += b_cksum.Length; // Console.WriteLine("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;
}
/// <summary>
/// This Method has the algorithm to make a checksum
/// </summary>
public static UInt16 checksum( UInt16[] buffer, int size )
{
Int32 cksum = 0;
int counter;
counter = 0; while ( size > 0 ) {
UInt16 val = buffer[counter]; cksum += Convert.ToInt32( buffer[counter] );
counter += 1;
size -= 1;
} cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >> 16);
return (UInt16)(~cksum);
}
} // class ping
/// <summary>
/// Class that holds the Pack information
/// </summary>
public class IcmpPacket
{
public Byte Type; // type of message
public Byte SubCode; // type of sub code
public UInt16 CheckSum; // ones complement checksum of struct
public UInt16 Identifier; // identifier
public UInt16 SequenceNumber; // sequence number
public Byte [] Data; } // class IcmpPacket
}