计算机科学论坛--C# Socket 异步接受网络广播

必须设置SOCKET为低级操作模式

                    byte[] InByte = new byte[4] { 1, 0, 0, 0 };
                    byte[] OutByte = new byte[4];
                    int SIO_RCVALL = unchecked((int)0x98000001);
                    int ScoketCode = MySocket.IOControl(SIO_RCVALL, InByte, OutByte);
                    ScoketCode = OutByte[0] + OutByte[1] + OutByte[2] + OutByte[3];

数据包的结构
[StructLayout(LayoutKind.Explicit)]
public struct IPHeader
{
  [FieldOffset(0)] public byte    ip_verlen; //IP version and IP Header length Combined
  [FieldOffset(1)] public byte    ip_tos; //Type of Service
  [FieldOffset(2)] public ushort  ip_totallength; //Total Packet Length
  [FieldOffset(4)] public ushort  ip_id; //Unique ID
  [FieldOffset(6)] public ushort  ip_offset; //Flags and Offset
  [FieldOffset(8)] public byte    ip_ttl; //Time To Live
  [FieldOffset(9)] public byte    ip_protocol; //Protocol (TCP, UDP, ICMP, Etc.)
  [FieldOffset(10)] public ushort ip_checksum; //IP Header Checksum
  [FieldOffset(12)] public uint   ip_srcaddr; //Source IP Address
  [FieldOffset(16)] public uint   ip_destaddr; //Destination IP Address
}

下面是全部代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;

namespace ReceiveAll
{
    public class MyRawSocket
    {
        private IPAddress MyIP;
        private bool RunRawSocket = false;
        private Socket MySocket;

        public MyRawSocket(IPAddress MyIPAddress)
        {
            MyIP = MyIPAddress;

            MySocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
            MySocket.Blocking = false;
            MySocket.Bind(new IPEndPoint(MyIPAddress, 0));

            if (SetSocketIOControl() == false) return;
            RunRawSocket = true;
        }

        private bool SetSocketIOControl()
        {
            bool ReturnBool = true;
            try
            {
                MySocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, 1);
                byte[] InByte = new byte[4] { 1, 0, 0, 0 };
                byte[] OutByte = new byte[4];
                int SIO_RCVALL = unchecked((int)0x98000001);
                int ScoketCode = MySocket.IOControl(SIO_RCVALL, InByte, OutByte);
                ScoketCode = OutByte[0] + OutByte[1] + OutByte[2] + OutByte[3];
                if (ScoketCode != 0) ReturnBool = false;
            }
            catch (SocketException)
            {
                ReturnBool = false;
            }
            return ReturnBool;
        }

        public void Star()
        {
            byte[] Temp = new byte[0];
            IAsyncResult StarAsyncResult = MySocket.BeginReceive(Temp, 0, 0, SocketFlags.None, new AsyncCallback(CallReceive), MySocket);
        }
        public void Stop()
        {
            RunRawSocket = false;
        }

        private void CallReceive(IAsyncResult ar)
        {
            Socket sock = (Socket)ar.AsyncState;
            int ReceiveCount = sock.Available;

            if (ReceiveCount != 0)
            {
                byte[] Data = new byte[ReceiveCount];
                sock.Receive(Data);
                AssayByte(Data);
            }
            if (RunRawSocket) Star();
        }

        /// <summary>
        /// 分析数据
        /// </summary>
        /// <param name="Data"></param>
        private void AssayByte(byte[] Data)
        {
            IPData MyData = new IPData();
            if (Data.Length >= 24)
            {

MyData.HeaderLength = (uint)(Data[0] & 0x0F) << 2;

MyData.Version = (uint)(Data[0] & 0xF0) >> 4;

                switch (Data[9])
                {
                    case 1: MyData.Protocol = "ICMP"; break;
                    case 2: MyData.Protocol = "IGMP"; break;
                    case 6: MyData.Protocol = "TCP"; break;
                    case 17: MyData.Protocol = "UDP"; break;
                    default: MyData.Protocol = "UNKNOWN"; break;
                }

MyData.OriginationAddress = new IPAddress(new byte[] { Data[12], Data[13], Data[14], Data[15] });
MyData.DestinationAddress = new IPAddress(new byte[] { Data[16], Data[17], Data[18], Data[19] });

MyData.OriginationPort = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(new byte[] { Data[20], Data[21] }, 0));
MyData.DestinationPort = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(new byte[] { Data[22], Data[23] }, 0));

MyData.PacketLength = (uint)Data.Length;
MyData.MessageLength = (uint)Data.Length - MyData.HeaderLength;

                MyData.PackByte = Data;
            }
            else
            {
                MyData.PackByte = Data;
            }
            if (Receive != null) Receive(MyData);
        }

public delegate void ReceiveData(IPData ReceiveClass);
public event ReceiveData Receive;

public class IPData
{

            private uint _HeaderLength = 0;
            private uint _Version = 0;
            private string _Protocol = "";
            private IPAddress _OriginationAddress;
            private IPAddress _DestinationAddress;
            private short _OriginationPort = 0;
            private short _DestinationPort = 0;
            private uint _PacketLength = 0;
            private uint _MessageLength = 0;
            private byte[] _PackByte;
            /// <summary>
            /// IP头长度
            /// </summary>
            public uint HeaderLength { get { return _HeaderLength; } set { _HeaderLength = value; } }
            /// <summary>
            /// IP版本
            /// </summary>
            public uint Version { get { return _Version; } set { _Version = value; } }
            /// <summary>
            /// IP协议
            /// </summary>
            public string Protocol { get { return _Protocol; } set { _Protocol = value; } }
            /// <summary>
            /// 发送IP地址
            /// </summary>
            public IPAddress OriginationAddress { get { return _OriginationAddress; } set { _OriginationAddress = value; } }
            /// <summary>
            /// 接收IP地址
            /// </summary>
            public IPAddress DestinationAddress { get { return _DestinationAddress; } set { _DestinationAddress = value; } }
            /// <summary>
            /// 发送端口
            /// </summary>
            public short OriginationPort { get { return _OriginationPort; } set { _OriginationPort = value; } }
            /// <summary>
            /// 接收端口
            /// </summary>
            public short DestinationPort { get { return _DestinationPort; } set { _DestinationPort = value; } }
            /// <summary>
            /// 接收长度
            /// </summary>
            public uint PacketLength { get { return _PacketLength; } set { _PacketLength = value; } }
            /// <summary>
            /// 消息长度
            /// </summary>
            public uint MessageLength { get { return _MessageLength; } set { _MessageLength = value; } }

            /// <summary>
            /// 包数据
            /// </summary>
            public byte[] PackByte { get { return _PackByte; } set { _PackByte = value; } }

}

}
}

使用方式

   MyRawSocket myRawSock;
  private void MainForm_Load(object sender, System.EventArgs e)
  {
            myRawSock = new MyRawSocket(IPAddress.Parse("192.168.1.111"));
            myRawSock.Receive += new MyRawSocket.ReceiveData(myRawSock_Receive);
  }

        void myRawSock_Receive(MyRawSocket.IPData ReceiveClass)
        {
            string Temp = ReceiveClass.OriginationAddress.ToString() + ":" + ReceiveClass.OriginationPort.ToString()+"\t";
            Temp+=ReceiveClass.DestinationAddress.ToString() + ":" + ReceiveClass.DestinationPort.ToString()+"\t";
            Temp+="{Size="+ReceiveClass.PackByte.Length.ToString()+"}";
            this.Invoke((MethodInvoker)delegate { listBox1.Items.Add(Temp); });
        }
        private void button1_Click(object sender, System.EventArgs e)
  {
            myRawSock.Star();
  }


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