C# 实现TCP握手示例代码

class Program
    {
        private static Socket m_socket = null;
        private static byte[] m_buffer = new byte[65535];
        
        public static void Main(string[] args)
        {
            startSniffer("192.168.0.237");
            //发送握手包
                System.Random rnd = new Random(System.DateTime.Now.Millisecond); 
                byte[] tcpoption={0x02, 0x04, 0x05, 0xB4, 0x01, 0x01, 0x04, 0x02 };
                PackInfo packInfo=new PackInfo();
                packInfo.ip_ident=1600;//(ushort)rnd.Next();
                packInfo.ip_sourceIP=(uint)IPAddress.Parse("192.168.0.237").Address;
                packInfo.ip_destIP=(uint)IPAddress.Parse("192.168.0.36").Address;
                packInfo.tcp_th_sport=(ushort)rnd.Next();
                packInfo.tcp_th_dport=80;
                packInfo.tcp_th_seq=(uint)rnd.Next();
                packInfo.tcp_th_ack=0;
                //设置fLAG为申请握手
                packInfo.tcp_th_flag=0x2;
                packInfo.tcp_th_option=new byte[tcpoption.Length];packInfo.tcp_th_option=tcpoption;
                packInfo.tcp_data=String.Empty;
                IPPacket ipp = new IPPacket();
                ipp.IPPacketSent(m_socket,packInfo);//发申请包
                m_socket.BeginReceive(m_buffer, 0, m_buffer.Length, 0, new AsyncCallback(OnPacketSync), null);
                Console.WriteLine("BeginReceive.\r\n");
                Console.ReadLine();    
    }