动态查找wifi桥的MAC和ip

Question

I have a terminal and a wifi bridge(to access avaliable wifi spots). Via NetworkInterface I can find ethernet connection with wifi bridge. So now I need to connect to this bridge to get avaliable wifi spots, is it wright or it is already connected(I can see Lan connection)? For connection I need to find MAC and Ip address of this bridge. Is it possible to find dynamically using Net libraries? I was tring managedwifi, but it gives error 1062:

 WlanClient client = new WlanClient();

Any ideas how can I find MAC address of that wifi bridge?

Answer 1

Here is code to get arp table

   public class GetArpTable
    {
        // The max number of physical addresses. 
        const int MAXLEN_PHYSADDR = 8;

       // Define the MIB_IPNETROW structure. 

        struct MIB_IPNETROW 
        {
            public int dwIndex;
            public int dwPhysAddrLen;
            public byte mac0;
            public byte mac1;
            public byte mac2;
            public byte mac3;
            public byte mac4;
            public byte mac5;
            public byte mac6;
            public byte mac7;
            public int dwAddr;
            public int dwType;
        }

        // Declare the GetIpNetTable function.
        [DllImport("IpHlpApi.dll")]
        [return: MarshalAs(UnmanagedType.U4)]

        static extern int GetIpNetTable(
           IntPtr pIpNetTable,
           [MarshalAs(UnmanagedType.U4)] 
         ref int pdwSize,
           bool bOrder);

        // The insufficient buffer error. 
        const int ERROR_INSUFFICIENT_BUFFER = 122;

        static IntPtr buffer;

        static int result;

        public GetArpTable()
        {
            // The number of bytes needed. 
            int bytesNeeded = 0;

            // The result from the API call. 
            result = GetIpNetTable(IntPtr.Zero, ref bytesNeeded, false);

            // Call the function, expecting an insufficient buffer. 
            if (result != ERROR_INSUFFICIENT_BUFFER)
            {
                // Throw an exception. 
                throw new Win32Exception(result);
            }

            // Allocate the memory, do it in a try/finally block, to ensure 
            // that it is released. 
            buffer = IntPtr.Zero;

            // Try/finally. 
            try
            {
                // Allocate the memory. 
                buffer = Marshal.AllocCoTaskMem(bytesNeeded);

                // Make the call again. If it did not succeed, then 
                // raise an error. 
                result = GetIpNetTable(buffer, ref bytesNeeded, false);

                // If the result is not 0 (no error), then throw an exception. 
                if (result != 0)
                {
                    // Throw an exception. 
                    throw new Win32Exception(result);
                }
            }
            finally
            {

            }
          }

         public static string ipstr;
         public static string macname;

         public static void GetNames(IP_Code.LocalHost LocalHost)
         {
            // Now we have the buffer, we have to marshal it. We can read 
            // the first 4 bytes to get the length of the buffer. 
            int entries = Marshal.ReadInt32(buffer);



            // Increment the memory pointer by the size of the int. 
            IntPtr currentBuffer = new IntPtr(buffer.ToInt64() +
               Marshal.SizeOf(typeof(int)));

            // Allocate an array of entries. 
            MIB_IPNETROW[] table = new MIB_IPNETROW[entries];

            // Cycle through the entries. 
            for (int index = 0; index < entries; index++)
            {
                // Call PtrToStructure, getting the structure information. 
                table[index] = (MIB_IPNETROW)Marshal.PtrToStructure(new
                   IntPtr(currentBuffer.ToInt64() + (index *
                   Marshal.SizeOf(typeof(MIB_IPNETROW)))), typeof(MIB_IPNETROW));
            }

            for (int index = 0; index < entries; index++)
            {

                IPAddress ip = new IPAddress((table[index].dwAddr& 0xFFFFFFFF));
                Console.Write("IP:" + ip.ToString() + "\t\tMAC:");


                ipstr = ip.ToString();
                macname = "MAC:";


                byte b;

                b = table[index].mac0;
                if (b < 0x10)
                {
                    Console.Write("0");
                    macname = macname + "0";
                }
                else
                {
                    Console.Write("");
                }
                Console.Write(b.ToString("X"));
                macname = macname + b.ToString("X");

                b = table[index].mac1;
                if (b < 0x10)
                {
                    Console.Write("-0");
                    macname = macname + "-0";
                }
                else
                {
                    Console.Write("-");
                    macname = macname + "-";
                }
                Console.Write(b.ToString("X"));
                macname = macname + b.ToString("X");

                b = table[index].mac2;
                if (b < 0x10)
                {
                    Console.Write("-0");
                    macname = macname + "-0";
                }
                else
                {
                    Console.Write("-");
                    macname = macname + "-";
                }
                Console.Write(b.ToString("X"));
                macname = macname + b.ToString("X");

                b = table[index].mac3;
                if (b < 0x10)
                {
                    Console.Write("-0");
                    macname = macname + "-0";
                }
                else
                {
                    Console.Write("-");
                    macname = macname + "-";
                }
                Console.Write(b.ToString("X"));
                macname = macname + b.ToString("X");

                b = table[index].mac4;
                if (b < 0x10)
                {
                    Console.Write("-0");
                    macname = macname + "-0";
                }
                else
                {
                    Console.Write("-");
                    macname = macname + "-";
                }
                Console.Write(b.ToString("X"));
                macname = macname + b.ToString("X");

                b = table[index].mac5;
                if (b < 0x10)
                {
                    Console.Write("-0");
                    macname = macname + "-0";
                }
                else
                {
                    Console.Write("-");
                    macname = macname + "-";
                }
                Console.Write(b.ToString("X"));
                macname = macname + b.ToString("X");
                Console.WriteLine();

                //test for device
                if (table[index].mac0 == 0x00 && 
                    table[index].mac1 == 0x00 && 
                    table[index].mac2 == 0x00)
                {
                    //if device matches
                }
            }   

         }

         ~GetArpTable()
         {
             // Release the memory. 
             Marshal.FreeCoTaskMem(buffer);
         }

    } ​

Answer 2

You need the BSSID, which is the MAC address of the access point. There is another thread explaining something related to wifi and inside it you can find the code to obtain the bssid in c#: C# - How do I access the WLAN signal strength and others?