public string GetMacAddress(string ipAddress)
{
string macAddress = string.Empty;
System.Diagnostics.Process pProcess = new System.Diagnostics.Process();
pProcess.StartInfo.FileName = "arp";
pProcess.StartInfo.Arguments = "-a " + ipAddress;
pProcess.StartInfo.UseShellExecute = false;
pProcess.StartInfo.RedirectStandardOutput = true;
pProcess.StartInfo.CreateNoWindow = true;
pProcess.Start();
string strOutput = pProcess.StandardOutput.ReadToEnd();
string[] substrings = strOutput.Split('-');
if (substrings.Length >= 8)
{
macAddress = substrings[3].Substring(Math.Max(0, substrings[3].Length - 2))
+ "-" + substrings[4] + "-" + substrings[5] + "-" + substrings[6]
+ "-" + substrings[7] + "-"
+ substrings[8].Substring(0, 2);
return macAddress;
}
else
{
return "not found";
}
}
非常に遅い編集:
オープン ソース プロジェクト iSpy ( https://github.com/ispysoftware/iSpy ) では、このコードを使用しています。
public static void RefreshARP()
{
_arpList = new Dictionary<string, string>();
_arpList.Clear();
try
{
var arpStream = ExecuteCommandLine("arp", "-a");
// Consume first three lines
for (int i = 0; i < 3; i++)
{
arpStream.ReadLine();
}
// Read entries
while (!arpStream.EndOfStream)
{
var line = arpStream.ReadLine();
if (line != null)
{
line = line.Trim();
while (line.Contains(" "))
{
line = line.Replace(" ", " ");
}
var parts = line.Trim().Split(' ');
if (parts.Length == 3)
{
string ip = parts[0];
string mac = parts[1];
if (!_arpList.ContainsKey(ip))
_arpList.Add(ip, mac);
}
}
}
}
catch (Exception ex)
{
Logger.LogExceptionToFile(ex, "ARP Table");
}
if (_arpList.Count > 0)
{
foreach (var nd in List)
{
string mac;
ARPList.TryGetValue(nd.IPAddress.ToString(), out mac);
nd.MAC = mac;
}
}
}
https://github.com/ispysoftware/iSpy/blob/master/Server/NetworkDeviceList.cs
更新 2 はさらに遅くなりますが、正確な一致をより適切にチェックする正規表現を使用するため、最適だと思います。
public string getMacByIp(string ip)
{
var macIpPairs = GetAllMacAddressesAndIppairs();
int index = macIpPairs.FindIndex(x => x.IpAddress == ip);
if (index >= 0)
{
return macIpPairs[index].MacAddress.ToUpper();
}
else
{
return null;
}
}
public List<MacIpPair> GetAllMacAddressesAndIppairs()
{
List<MacIpPair> mip = new List<MacIpPair>();
System.Diagnostics.Process pProcess = new System.Diagnostics.Process();
pProcess.StartInfo.FileName = "arp";
pProcess.StartInfo.Arguments = "-a ";
pProcess.StartInfo.UseShellExecute = false;
pProcess.StartInfo.RedirectStandardOutput = true;
pProcess.StartInfo.CreateNoWindow = true;
pProcess.Start();
string cmdOutput = pProcess.StandardOutput.ReadToEnd();
string pattern = @"(?<ip>([0-9]{1,3}\.?){4})\s*(?<mac>([a-f0-9]{2}-?){6})";
foreach (Match m in Regex.Matches(cmdOutput, pattern, RegexOptions.IgnoreCase))
{
mip.Add(new MacIpPair()
{
MacAddress = m.Groups["mac"].Value,
IpAddress = m.Groups["ip"].Value
});
}
return mip;
}
public struct MacIpPair
{
public string MacAddress;
public string IpAddress;
}