blind windows arp table implementation

src/Scanning/Arp/WindowsArpTableProvider.cs

@@ -0,0 +1,54 @@
+using System.Diagnostics;
+using System.Net;
+using System.Runtime.Versioning;
+using Drift.Domain.Device.Addresses;
+
+namespace Drift.Scanning.Arp;
+
+[SupportedOSPlatform( "windows" )]
+internal class WindowsArpTableProvider : ArpTableProviderBase {
+  protected override ArpTable ReadSystemArpCache() {
+    var map = new Dictionary<IPAddress, MacAddress>();
+
+    var startInfo = new ProcessStartInfo {
+      FileName = "arp",
+      Arguments = "-a",
+      RedirectStandardOutput = true,
+      UseShellExecute = false,
+      CreateNoWindow = true
+    };
+
+    using var proc = Process.Start( startInfo );
+    if ( proc == null ) {
+      throw new InvalidOperationException( "Failed to start 'arp' process." );
+    }
+
+    while ( !proc.StandardOutput.EndOfStream ) {
+      var line = proc.StandardOutput.ReadLine();
+      // Console.WriteLine( line );
+      if ( string.IsNullOrWhiteSpace( line ) ) {
+        continue;
+      }
+
+      if ( line.StartsWith( "Interface" ) ) {
+        continue; // skip header
+      }
+
+      var parts = line.Split( (char[]?) null, StringSplitOptions.RemoveEmptyEntries );
+
+      // Defensive: expects at least Internet Address, Physical Address, Type
+      if ( parts.Length >= 3 &&
+           parts[0].Count( c => c == '.' ) == 3 && // Looks like an IP
+           parts[1].Contains( ':' ) // Looks like a MAC
+         ) {
+        var ip = parts[0];
+        var mac = parts[1].ToUpperInvariant();
+
+        var ipParsed = IPAddress.Parse( ip );
+        map[ipParsed] = new MacAddress( mac );
+      }
+    }
+
+    return new ArpTable( map );
+  }
+}