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服务端

using System.Net.Sockets;
using System.Net;int serverPort = 50001;
Socket server;
EndPoint client = new IPEndPoint(IPAddress.Any, 0);//用来保存发送方的ip和端口号CreateSocket();void CreateSocket()
{server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);IPAddress ip = IPAddress.Any;server.Bind(new IPEndPoint(ip, serverPort));//绑定端口号和IPConsole.WriteLine("服务端已经开启，监听端口："+ serverPort);Thread t = new Thread(ReciveMsg);//开启接收消息线程t.Start();}/// <summary>
/// 接收发送给本机ip对应端口号的数据报
/// </summary>
void ReciveMsg()
{byte[] buffer = new byte[1024];while (true){Console.WriteLine("等待接收数据 ...");int length = server.ReceiveFrom(buffer, ref client);//接收数据报try{int no = BitConverter.ToInt32(buffer, 0);long getd = BitConverter.ToInt64(buffer, 4);//string message = Encoding.UTF8.GetString(buffer, 0, length);Console.WriteLine(client.ToString() + " : " + no + "," + getd);server.SendTo(buffer, client);}catch{Console.WriteLine("error."+ client.ToString()+","+ buffer.Length.ToString());}}
}

注意下端口号，可以使用下面的命令查看是否被占用

netstat -alnp |grep 50001

如果没输出代表没有被使用，注意防火墙开启udp的端口

客户端

#define WLOGusing System.Net.Sockets;
using System.Net;
using System.Text;
using System.Diagnostics;string serverIp = "192.168.3.76";
int serverPort = 50001;
int lost = 0;   //丢包率
long ping = 0;Socket client;
EndPoint server;
int sendno = 0; //连续编号int lostcount = 10;  //丢包百分比数组
int[] losts = new int[lostcount];EndPoint recivePoint = new IPEndPoint(IPAddress.Any, 0);//用来保存发送方的ip和端口号
CreateClient();void CreateClient()
{for (int i = 0; i < lostcount; i++)losts[i] = 1;client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);client.Bind(new IPEndPoint(IPAddress.Any, 0));server = new IPEndPoint(IPAddress.Parse(serverIp), serverPort);Thread t = new Thread(sendMsg);t.Start();Thread t2 = new Thread(ReciveMsg);t2.Start();
}void Send()
{//发包格式#0编号，1时间long milliseconds = DateTimeOffset.Now.ToUnixTimeMilliseconds();List<byte> byteSource = new List<byte>();byteSource.AddRange(BitConverter.GetBytes(sendno));byte[] tick = BitConverter.GetBytes(milliseconds);byteSource.AddRange(tick);//byte[] sendata = milliseconds.tob Encoding.UTF8.GetBytes("unity hellp");byte[] data = byteSource.ToArray();client.SendTo(data, server);losts[sendno % lostcount] = 0;sendno++;Console.WriteLine("data:"+ milliseconds.ToString()+ ",lost:"+ lost+"%");
}
/// <summary>
/// 向特定ip的主机的端口发送数据报
/// </summary>
void sendMsg()
{while (true){Send();Thread.Sleep(500);ComputLost();Thread.Sleep(500);}
}void ComputLost()
{int all = 0;for (int i = 0; i < lostcount; i++){if (losts[i] == 0)all++;}lost = (int)(all * 100.0 / lostcount);
}/// <summary>
/// 接收发送给本机ip对应端口号的数据报
/// </summary>
void ReciveMsg()
{byte[] buffer = new byte[1024];while (true){try{int length = client.Receive(buffer);//, ref recivePoint);//接收数据报int no = BitConverter.ToInt32(buffer, 0);long getd = BitConverter.ToInt64(buffer, 4);long milliseconds = DateTimeOffset.Now.ToUnixTimeMilliseconds();ping = milliseconds - getd;losts[no % lostcount] = (int)ping+1;Console.WriteLine(recivePoint.ToString() + " , no : " + no + " , getd : " + getd + " , ping : " + ping);}catch(Exception e) {Console.WriteLine(e.ToString());}}
}

其中ping就是发包返回的时间。lost都是发10个包丢了几个。

在Centos部署

把代码拷贝到centos目录下

如果没安装dotnet，我们安装运行时就可以了

sudo rpm -Uvh https://packages.microsoft.com/config/centos/7/packages-microsoft-prod.rpmsudo yum install dotnet-runtime-7.0

如果直接运行，可以输入

dotnet PingServer.dll

创建服务开机启动

vim /etc/systemd/system/pingserver.service

内容如下

[Unit]
Description=pingserver for centos7[Service]
WorkingDirectory=/home/pingserver/Release
ExecStart=/usr/bin/dotnet /home/pingserver/Release/PingServer.dll
Restart=always
RestartSec=10  # Restart service after 10 seconds if dotnet service crashes
SyslogIdentifier=dotnet-pingserver
User=root
Environment=ASPNETCORE_ENVIRONMENT=Production
Environment=DOTNET_PRINT_TELEMETRY_MESSAGE=false[Install]
WantedBy=multi-user.target

可以设置开机启动

systemctl enable pingserver.service

开启和状态

systemctl start pingserver.service
systemctl stop pingserver.service
systemctl status pingserver.service

注意配置文件如果在windows下编辑，记得换行符要改成LF（unix）格式的utf8才可以。