Made a lot of changes. Enhanced memory usage.

Models/Experimental/CustomPing.cs

@@ -0,0 +1,39 @@
+using System.Diagnostics;
+using System.Net;
+using System.Net.NetworkInformation;
+using System.Net.Sockets;
+using Models.Model.Backend;
+namespace Models.Experimental;
+public class CustomPing
+{
+    public static IPStatus SendIcmpEchoRequestOverRawSocket(IPAddress address, int timeout)
+    {
+        SocketConfig socketConfig = new SocketConfig(new IPEndPoint(address, 0), timeout, (CustomProtocolType) 1, RawSocket.CreateSendMessageBuffer(new() {Type = 8}));
+        using Socket rawSocket = RawSocket.GetRawSocket(socketConfig);
+        int ipHeaderLength = 20;
+            
+        try
+        {
+            rawSocket.SendTo(socketConfig.SendBuffer, 0, socketConfig.SendBuffer.Length, SocketFlags.None, socketConfig.EndPoint);
+            byte[] numArray = new byte[136];
+            long timestamp = Stopwatch.GetTimestamp();
+            
+            // TODO: WTF ???
+            EndPoint lol = socketConfig.EndPoint;
+                
+            while (Stopwatch.GetElapsedTime(timestamp).TotalMilliseconds < timeout)
+            {
+                int from = rawSocket.ReceiveFrom(numArray, SocketFlags.None, ref lol);
+                    
+                IPStatus status;
+                if (from - ipHeaderLength >= 8 && RawSocket.TryGetPingReply(numArray, from, ref ipHeaderLength, out status))
+                    return status;
+            }
+        }
+        catch (SocketException ex) when (ex.SocketErrorCode == SocketError.TimedOut)
+        {
+        }
+            
+        return IPStatus.TimedOut;
+    }
+}

Models/Experimental/MessageConstant.cs

@@ -0,0 +1,59 @@
+using System.Net.NetworkInformation;
+namespace Models.Experimental;
+public struct MessageConstant
+{
+  public static IPStatus MapV4TypeToIpStatus(int type, int code)
+  {
+    IPStatus ipStatus1;
+    switch ((IcmpV4MessageType) type)
+    {
+      case IcmpV4MessageType.EchoReply:
+        ipStatus1 = IPStatus.Success;
+        break;
+      case IcmpV4MessageType.DestinationUnreachable:
+        IPStatus ipStatus2;
+        switch ((byte) code)
+        {
+          case 0:
+            ipStatus2 = IPStatus.DestinationNetworkUnreachable;
+            break;
+          case 1:
+            ipStatus2 = IPStatus.DestinationHostUnreachable;
+            break;
+          case 2:
+            ipStatus2 = IPStatus.DestinationProtocolUnreachable;
+            break;
+          case 3:
+            ipStatus2 = IPStatus.DestinationPortUnreachable;
+            break;
+          default:
+            ipStatus2 = IPStatus.DestinationUnreachable;
+            break;
+        }
+        ipStatus1 = ipStatus2;
+        break;
+      case IcmpV4MessageType.SourceQuench:
+        ipStatus1 = IPStatus.SourceQuench;
+        break;
+      case IcmpV4MessageType.TimeExceeded:
+        ipStatus1 = IPStatus.TtlExpired;
+        break;
+      case IcmpV4MessageType.ParameterProblemBadIpHeader:
+        ipStatus1 = IPStatus.BadHeader;
+        break;
+      default:
+        ipStatus1 = IPStatus.Unknown;
+        break;
+    }
+    return ipStatus1;
+  }
+}
+
+internal enum IcmpV4MessageType : byte
+{
+  EchoReply = 0,
+  DestinationUnreachable = 3,
+  SourceQuench = 4,
+  TimeExceeded = 11, // 0x0B
+  ParameterProblemBadIpHeader = 12, // 0x0C
+}

Models/Experimental/RawSocket.cs

@@ -0,0 +1,91 @@
+using System.Net;
+using System.Net.NetworkInformation;
+using System.Net.Sockets;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using Models.Model.Backend;
+
+namespace Models.Experimental;
+
+public class RawSocket
+{
+    public static unsafe Socket GetRawSocket(SocketConfig socketConfig)
+    {
+        Socket rawSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, (ProtocolType)socketConfig.ProtocolType);
+        rawSocket.ReceiveTimeout = socketConfig.Timeout;
+        rawSocket.SendTimeout = socketConfig.Timeout;
+        rawSocket.Connect(socketConfig.EndPoint);
+        int num = 1;
+        rawSocket.SetRawSocketOption(0, 11, new ReadOnlySpan<byte>((void*) &num, 4));
+        return rawSocket;
+    }
+    
+    public static bool TryGetPingReply(byte[] receiveBuffer, int bytesReceived, ref int ipHeaderLength, out IPStatus reply)
+    {
+        byte num = (byte) (receiveBuffer[0] & 15U);
+        ipHeaderLength = 4 * num;
+        
+        int start = ipHeaderLength;
+        int srcOffset = ipHeaderLength + 8;
+        
+        IcmpHeader icmpHeader = Unsafe.ReadUnaligned<IcmpHeader>(ref MemoryMarshal.GetReference<byte>(receiveBuffer.AsSpan<byte>(start)));
+        byte[] numArray = new byte[bytesReceived - srcOffset];
+        Buffer.BlockCopy(receiveBuffer, srcOffset, numArray, 0, numArray.Length);
+        reply = MessageConstant.MapV4TypeToIpStatus(icmpHeader.Type, icmpHeader.Code);
+        return true;
+    }
+    
+    public static unsafe byte[] CreateSendMessageBuffer(IcmpHeader icmpHeader)
+    {
+        int length = sizeof (IcmpHeader);
+        byte[] sendMessageBuffer = new byte[length];
+        new Span<byte>((void*) &icmpHeader, length).CopyTo(new Span<byte>(sendMessageBuffer, 0, length));
+        ushort bufferChecksum = ComputeBufferChecksum(sendMessageBuffer.AsSpan<byte>(0));
+        sendMessageBuffer[2] = (byte) ((uint) bufferChecksum >> 8);
+        sendMessageBuffer[3] = (byte) (bufferChecksum & byte.MaxValue);
+        return sendMessageBuffer;
+    }
+    
+    private static ushort ComputeBufferChecksum(ReadOnlySpan<byte> buffer)
+    {
+        uint num1 = 0;
+        for (int index = 0; index < buffer.Length; index += 2)
+        {
+            ushort num2 = (ushort) ((ushort) (buffer[index] << 8 & 65280) | (index + 1 < buffer.Length ? (ushort) (buffer[index + 1] & (uint) byte.MaxValue) : 0));
+            num1 += num2;
+        }
+        while (num1 >> 16 != 0U)
+            num1 = (num1 & ushort.MaxValue) + (num1 >> 16);
+        return (ushort) ~num1;
+    }
+}
+
+public class SocketConfig
+{
+    public EndPoint EndPoint;
+    public readonly int Timeout;
+    public readonly CustomProtocolType ProtocolType;
+    public readonly byte[] SendBuffer;
+
+    public SocketConfig(
+        EndPoint endPoint,
+        int timeout,
+        CustomProtocolType protocolType,
+        byte[] sendBuffer)
+    {
+        EndPoint = endPoint;
+        Timeout = timeout;
+        ProtocolType = protocolType;
+        SendBuffer = sendBuffer;
+    }
+}
+
+
+public struct IcmpHeader
+{
+    public byte Type;
+    public byte Code;
+    public ushort HeaderChecksum;
+    public ushort Identifier;
+    public ushort SequenceNumber;
+}