winsock2wrapper.cs

破解的飞信源代码

namespace NCindy.Util
{
    using System;
    using System.Net;
    using System.Net.Sockets;
    using System.Runtime.InteropServices;

    public static class WinSock2Wrapper
    {
        public const int INT32_LENGTH = 4;
        private static readonly byte[] KeepAliveOff = BitConverter.GetBytes((uint) 0);
        private static readonly byte[] KeepAliveOn = BitConverter.GetBytes((uint) 1);
        public const int SO_CONNECT_TIME = 0x700c;
        private static readonly int UintSize = Marshal.SizeOf(typeof(uint));

        public static int GetConnectTime(Socket sock)
        {
            int optval;
            if (sock == null)
            {
                throw new ArgumentNullException();
            }
            int optlen = 4;
            if (getsockopt(sock.Handle, 0xffff, 0x700c, out optval, ref optlen) != 0)
            {
                throw new SocketException(WSAGetLastError());
            }
            return optval;
        }

        [DllImport("ws2_32.dll", CharSet=CharSet.Auto, SetLastError=true)]
        private static extern int getsockopt(IntPtr socketHandle, int level, int optname, out int optval, ref int optlen);
        public static IPEndPoint QueryRoutingInterface(Socket sock, IPEndPoint remoteEP)
        {
            LangHelper.CheckNullArgument("sock", sock);
            LangHelper.CheckNullArgument("remoteEP", remoteEP);
            SocketAddress socketAddress = remoteEP.Serialize();
            byte[] buffer = new byte[socketAddress.Size];
            for (int i = 0; i < socketAddress.Size; i++)
            {
                buffer[i] = socketAddress[i];
            }
            byte[] buffer2 = new byte[buffer.Length];
            sock.IOControl(0xc8000014, buffer, buffer2);
            for (int j = 0; j < socketAddress.Size; j++)
            {
                socketAddress[j] = buffer2[j];
            }
            IPEndPoint point = (IPEndPoint) remoteEP.Create(socketAddress);
            point.Port = ((IPEndPoint) sock.LocalEndPoint).Port;
            return point;
        }

        public static void SetKeepAlive(Socket s, bool on, uint time, uint interval)
        {
            byte[] dst = new byte[UintSize * 3];
            Buffer.BlockCopy(on ? ((Array) KeepAliveOn) : ((Array) KeepAliveOff), 0, dst, 0, UintSize);
            Buffer.BlockCopy(BitConverter.GetBytes(time), 0, dst, UintSize, UintSize);
            Buffer.BlockCopy(BitConverter.GetBytes(interval), 0, dst, UintSize * 2, UintSize);
            s.IOControl(0x98000004, dst, null);
        }

        [DllImport("ws2_32.dll", CharSet=CharSet.Auto, SetLastError=true)]
        private static extern int WSAGetLastError();
    }
}