如何通过.NET访问ARP协议信息？
我正试图弄清楚我们的局域网中有哪些设备在线和离线。 我见过很多程序在做一种graphics化的networking概述，介绍局域网IP和MAC地址。 我想知道是否以及如何从C＃/。NET中提取这些（ARP？）信息？
任何示例代码片断/链接将不胜感激。
如果你知道哪些设备在那里，你可以使用Ping类 。 这将允许你至less填满ARP表。 您可以始终执行ARP -a并在必要时parsing输出。 这里也是一个链接，显示如何调用GetIpNetTable 。 我已经包含了Ping类以下的示例以及如何使用GetIpNetTable访问ARP表。
这是Ping类的一个例子
using System; using System.Net; using System.Net.NetworkInformation; using System.Text; namespace Examples.System.Net.NetworkInformation.PingTest { public class PingExample { // args[0] can be an IPaddress or host name. public static void Main (string[] args) { Ping pingSender = new Ping (); PingOptions options = new PingOptions (); // Use the default Ttl value which is 128, // but change the fragmentation behavior. options.DontFragment = true; // Create a buffer of 32 bytes of data to be transmitted. string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"; byte[] buffer = Encoding.ASCII.GetBytes (data); int timeout = 120; PingReply reply = pingSender.Send (args[0], timeout, buffer, options); if (reply.Status == IPStatus.Success) { Console.WriteLine ("Address: {0}", reply.Address.ToString ()); Console.WriteLine ("RoundTrip time: {0}", reply.RoundtripTime); Console.WriteLine ("Time to live: {0}", reply.Options.Ttl); Console.WriteLine ("Don't fragment: {0}", reply.Options.DontFragment); Console.WriteLine ("Buffer size: {0}", reply.Buffer.Length); } } } } 这是GetIpNetTable的一个例子。
using System; using System.Runtime.InteropServices; using System.ComponentModel; using System.Net; namespace GetIpNetTable { class Program { // The max number of physical addresses. const int MAXLEN_PHYSADDR = 8; // Define the MIB_IPNETROW structure. [StructLayout(LayoutKind.Sequential)] struct MIB_IPNETROW { [MarshalAs(UnmanagedType.U4)] public int dwIndex; [MarshalAs(UnmanagedType.U4)] public int dwPhysAddrLen; [MarshalAs(UnmanagedType.U1)] public byte mac0; [MarshalAs(UnmanagedType.U1)] public byte mac1; [MarshalAs(UnmanagedType.U1)] public byte mac2; [MarshalAs(UnmanagedType.U1)] public byte mac3; [MarshalAs(UnmanagedType.U1)] public byte mac4; [MarshalAs(UnmanagedType.U1)] public byte mac5; [MarshalAs(UnmanagedType.U1)] public byte mac6; [MarshalAs(UnmanagedType.U1)] public byte mac7; [MarshalAs(UnmanagedType.U4)] public int dwAddr; [MarshalAs(UnmanagedType.U4)] 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); [DllImport("IpHlpApi.dll", SetLastError = true, CharSet = CharSet.Auto)] internal static extern int FreeMibTable(IntPtr plpNetTable); // The insufficient buffer error. const int ERROR_INSUFFICIENT_BUFFER = 122; static void Main(string[] args) { // The number of bytes needed. int bytesNeeded = 0; // The result from the API call. int 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. IntPtr 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); } // 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++) { MIB_IPNETROW row = table[index]; IPAddress ip=new IPAddress(BitConverter.GetBytes(row.dwAddr)); Console.Write("IP:"+ip.ToString()+"\t\tMAC:"); Console.Write( row.mac0.ToString("X2") + '-'); Console.Write( row.mac1.ToString("X2") + '-'); Console.Write( row.mac2.ToString("X2") + '-'); Console.Write( row.mac3.ToString("X2") + '-'); Console.Write( row.mac4.ToString("X2") + '-'); Console.WriteLine( row.mac5.ToString("X2")); } } finally { // Release the memory. FreeMibTable(buffer); } } } }
希望你试图从IP地址获得MAC地址，而不是相反。
这是一个人的例子的链接：
ARPparsing器
我没有尝试过，让我们知道它是如何工作的。
Googlesearch“fingbox”。 似乎你正在试图检测事件？
这是一个入侵者检测设备，这是完全合法的，这是很好的知道谁是运输使用您的WiFi，在什么端口。 有时它也显示MAC地址，可以ping通。 有其他function的堆。
