cscの作法 その549

概要

cscの作法、調べてみた。
練習問題やってみた。

練習問題

IPv6を叩け。

環境

windows11

参考にしたページ

サンプルコード

using System;
using System.Net;
using System.Net.Sockets;

class Program {
	private static bool ListenFlag = true;
	static void Client(string ipAddr_v6, string ipAddr_v4, int port) {
		Console.WriteLine("IPv6 で送ります。");
		Socket socket = new Socket(AddressFamily.InterNetworkV6, SocketType.Stream, ProtocolType.Tcp);
		socket.Connect(new IPEndPoint(IPAddress.Parse(ipAddr_v6), port));
		socket.Disconnect(false);
		socket.Dispose();
		Console.WriteLine("3秒ほどWaitします");
		System.Threading.Thread.Sleep(3000);
		Console.WriteLine("IPv4 で送ります。");
		socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
		socket.Connect(new IPEndPoint(IPAddress.Parse(ipAddr_v4), port));
		socket.Disconnect(false);
		socket.Dispose();
	}
	static void Server(int port) {
		Console.WriteLine("Start IPv6 Listen");
		Listen(IPAddress.IPv6Any, port);
		Console.WriteLine("Start IPv4 Listen");
		Listen(IPAddress.Any, port);
		while (ListenFlag)
		{
			System.Threading.Thread.Sleep(10000);
			Console.WriteLine("Listen now ...");
		}
		Console.WriteLine("End Listen");
	}
	private static void Listen(IPAddress ipaddr, int port) {
		TcpListener listen = new TcpListener(ipaddr, port);
		listen.Start();
		listen.BeginAcceptSocket(DoAcceptSocketCallback, listen);
	}
	private static void DoAcceptSocketCallback(IAsyncResult ar) {
		TcpListener listen = ar.AsyncState as TcpListener;
		Socket socket = listen.EndAcceptSocket(ar);
		Console.WriteLine("Connect Success.");
		if (socket.AddressFamily == AddressFamily.InterNetworkV6)
		{
			Console.WriteLine("IPv6");
			Console.WriteLine("送信元IP");
			Console.WriteLine(socket.LocalEndPoint.ToString());
		}
		else if (socket.AddressFamily == AddressFamily.InterNetwork)
		{
			Console.WriteLine("IPv4");
			Console.WriteLine("送信元IP");
			Console.WriteLine(socket.LocalEndPoint.ToString());
		}
		listen.BeginAcceptSocket(DoAcceptSocketCallback, listen);
	}
	static void Main(string[] args) {
		string ipaddr_v6 = "fe80::*:*:*:cfa6%16";
		string ipaddr_v4 = "192.168.0.104";
		Console.WriteLine("0	:Client");
		Console.WriteLine("other:Server");
		int num = 0;
		try
		{
			num = int.Parse(Console.ReadLine());
		}
		catch (Exception)
		{
			num = int.MaxValue;
		}
		switch (num)
		{
		case 0:
			Console.WriteLine("Start Client");
			Client(ipaddr_v6, ipaddr_v4, 9999);
			Console.WriteLine("End Client");
		break;
		default:
			Console.WriteLine("Start Server");
			Server(9999);
			Console.WriteLine("End Server");
		break;
		}
	}
}

実行結果

server

>v6
0       :Client
other:Server
1
Start Server
Start IPv6 Listen
Start IPv4 Listen
Listen now ...
Connect Success.
IPv6
送信元IP
[fe80::*:*:*:cfa6%16]:9999
Connect Success.
IPv4
送信元IP
192.168.0.104:9999
Listen now ...
Listen now ...

client

>v6
0       :Client
other:Server
0
Start Client
IPv6 で送ります。
3秒ほどWaitします
IPv4 で送ります。
End Client

以上。