c#编写的PING工具
www.chinacs.net 2001-4-27 16:06:00 中文C#技术站
导 读：PING 是一个用来检测网络连接速度的使用工具，下面的文章将介绍在C#中利用System.Net.Sockets 来创建一个自己的PING 工具。
PING 是一个用来检测网络连接速度的工具，它会在本机和给出的远程主机名之间建立一个SOCKET 连接并向其发送一个ICMP协议格式的数据包，然后远程主机作出响应，发回一个数据包，通过计算发送到接收数据包的时间间隔，我们可以确定连接的速度。
使用方法 ping <hostname> [/r]
<hostname> 主机名
[/r] 可选属性，决定是否连续的 ping 远程主机。
下面是代码：
///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
}