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EonaCat.Connections
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Initial version

This commit is contained in:
EonaCat 2025-08-20 20:08:15 +02:00
parent d802217546
commit f08de22c70
21 changed files with 1680 additions and 42 deletions
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14
EonaCat.Connections.Client/EonaCat.Connections.Client.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\EonaCat.Connections\EonaCat.Connections.csproj" />
</ItemGroup>
</Project>

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EonaCat.Connections.Client/Program.cs Normal file
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using EonaCat.Connections;
using EonaCat.Connections.Models;
namespace EonaCat.Connections.Client.Example
{
public class Program
{
private static NetworkClient _client;
public static void Main(string[] args)
{
CreateClientAsync().ConfigureAwait(false);
while (true)
{
Console.Write("Enter message to send (or 'exit' to quit): ");
var message = Console.ReadLine();
if (!string.IsNullOrEmpty(message) && message.Equals("exit", StringComparison.OrdinalIgnoreCase))
{
_client.DisconnectAsync().ConfigureAwait(false);
break;
}
if (!string.IsNullOrEmpty(message))
{
_client.SendAsync(message).ConfigureAwait(false);
}
}
}
private static async Task CreateClientAsync()
{
var config = new Configuration
{
Protocol = ProtocolType.TCP,
Host = "127.0.0.1",
Port = 8080,
UseSsl = true,
UseAesEncryption = true,
ServerCertificate = new System.Security.Cryptography.X509Certificates.X509Certificate2("client.pfx", "p@ss"),
};
_client = new NetworkClient(config);
// Subscribe to events
_client.OnConnected += (sender, e) =>
Console.WriteLine($"Connected to server at {e.RemoteEndPoint}");
_client.OnDataReceived += (sender, e) =>
Console.WriteLine($"Server says: {(e.IsBinary ? $"{e.Data.Length} bytes" : e.StringData)}");
_client.OnDisconnected += (sender, e) =>
Console.WriteLine("Disconnected from server");
await _client.ConnectAsync();
// Send nickname
await _client.SendNicknameAsync("TestUser");
// Send a message
await _client.SendAsync("Hello server!");
}
}
}

14
EonaCat.Connections.Server/EonaCat.Connections.Server.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\EonaCat.Connections\EonaCat.Connections.csproj" />
</ItemGroup>
</Project>

75
EonaCat.Connections.Server/Program.cs Normal file
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using EonaCat.Connections;
using EonaCat.Connections.Models;
namespace EonaCat.Connections.Server.Example
{
public class Program
{
private static NetworkServer _server;
public static void Main(string[] args)
{
CreateServerAsync().ConfigureAwait(false);
while (true)
{
Console.Write("Enter message to send (or 'exit' to quit): ");
var message = Console.ReadLine();
if (!string.IsNullOrEmpty(message) && message.Equals("exit", StringComparison.OrdinalIgnoreCase))
{
_server.Stop();
_server.Dispose();
Console.WriteLine("Server stopped.");
break;
}
if (!string.IsNullOrEmpty(message))
{
_server.BroadcastAsync(message).ConfigureAwait(false);
}
}
}
private static async Task CreateServerAsync()
{
var config = new Configuration
{
Protocol = ProtocolType.TCP,
Port = 8080,
UseSsl = true,
UseAesEncryption = true,
MaxConnections = 100000,
ServerCertificate = new System.Security.Cryptography.X509Certificates.X509Certificate2("server.pfx", "p@ss"),
};
_server = new NetworkServer(config);
// Subscribe to events
_server.OnConnected += (sender, e) =>
Console.WriteLine($"Client {e.ClientId} connected from {e.RemoteEndPoint}");
_server.OnConnectedWithNickname += (sender, e) =>
Console.WriteLine($"Client {e.ClientId} connected with nickname: {e.Nickname}");
_server.OnDataReceived += async (sender, e) =>
{
Console.WriteLine($"Received from {e.ClientId}: {(e.IsBinary ? $"{e.Data.Length} bytes" : e.StringData)}");
// Echo back the message
if (e.IsBinary)
{
await _server.SendToClientAsync(e.ClientId, e.Data);
}
else
{
await _server.SendToClientAsync(e.ClientId, $"Echo: {e.StringData}");
}
};
_server.OnDisconnected += (sender, e) =>
Console.WriteLine($"Client {e.ClientId} disconnected");
await _server.StartAsync();
}
}
}

37
EonaCat.Connections.sln Normal file
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.14.36408.4
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EonaCat.Connections", "EonaCat.Connections\EonaCat.Connections.csproj", "{D3925D5A-4791-C3BB-93E0-25AC0C0ED425}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EonaCat.Connections.Client", "EonaCat.Connections.Client\EonaCat.Connections.Client.csproj", "{42A5F58D-850A-8272-4CD9-0B1BEFD12A11}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EonaCat.Connections.Server", "EonaCat.Connections.Server\EonaCat.Connections.Server.csproj", "{B0756C21-1D41-041C-D3D7-76A9A01E0009}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{D3925D5A-4791-C3BB-93E0-25AC0C0ED425}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{D3925D5A-4791-C3BB-93E0-25AC0C0ED425}.Debug|Any CPU.Build.0 = Debug|Any CPU
{D3925D5A-4791-C3BB-93E0-25AC0C0ED425}.Release|Any CPU.ActiveCfg = Release|Any CPU
{D3925D5A-4791-C3BB-93E0-25AC0C0ED425}.Release|Any CPU.Build.0 = Release|Any CPU
{42A5F58D-850A-8272-4CD9-0B1BEFD12A11}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{42A5F58D-850A-8272-4CD9-0B1BEFD12A11}.Debug|Any CPU.Build.0 = Debug|Any CPU
{42A5F58D-850A-8272-4CD9-0B1BEFD12A11}.Release|Any CPU.ActiveCfg = Release|Any CPU
{42A5F58D-850A-8272-4CD9-0B1BEFD12A11}.Release|Any CPU.Build.0 = Release|Any CPU
{B0756C21-1D41-041C-D3D7-76A9A01E0009}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{B0756C21-1D41-041C-D3D7-76A9A01E0009}.Debug|Any CPU.Build.0 = Debug|Any CPU
{B0756C21-1D41-041C-D3D7-76A9A01E0009}.Release|Any CPU.ActiveCfg = Release|Any CPU
{B0756C21-1D41-041C-D3D7-76A9A01E0009}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {28C40F0B-3539-41D4-B3F3-9DA55FE9CF1A}
EndGlobalSection
EndGlobal

27
EonaCat.Connections/EonaCat.Connections.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFrameworks>net48; net8.0</TargetFrameworks>
<LangVersion>latest</LangVersion>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
<Title>EonaCat.Connections</Title>
<Company>EonaCat (Jeroen Saey)</Company>
<Copyright>EonaCat (Jeroen Saey)</Copyright>
<PackageIcon>EonaCat.png</PackageIcon>
<PackageReadmeFile>readme.md</PackageReadmeFile>
</PropertyGroup>
<ItemGroup>
<None Include="..\EonaCat.png">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
<None Include="..\readme.md">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
</ItemGroup>
</Project>

11
EonaCat.Connections/EventArguments/ConnectionEventArgs.cs Normal file
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using System.Net;
namespace EonaCat.Connections.EventArguments
{
public class ConnectionEventArgs : EventArgs
{
public string ClientId { get; set; }
public IPEndPoint RemoteEndPoint { get; set; }
public DateTime Timestamp { get; set; } = DateTime.UtcNow;
}
}

11
EonaCat.Connections/EventArguments/DataReceivedEventArgs.cs Normal file
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namespace EonaCat.Connections
{
public class DataReceivedEventArgs : EventArgs
{
public string ClientId { get; set; }
public byte[] Data { get; set; }
public string StringData { get; set; }
public bool IsBinary { get; set; }
public DateTime Timestamp { get; set; } = DateTime.UtcNow;
}
}

10
EonaCat.Connections/EventArguments/ErrorEventArgs.cs Normal file
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namespace EonaCat.Connections.EventArguments
{
public class ErrorEventArgs : EventArgs
{
public string ClientId { get; set; }
public Exception Exception { get; set; }
public string Message { get; set; }
public DateTime Timestamp { get; set; } = DateTime.UtcNow;
}
}

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EonaCat.Connections/EventArguments/NicknameConnectionEventArgs.cs Normal file
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namespace EonaCat.Connections.EventArguments
{
public class NicknameConnectionEventArgs : ConnectionEventArgs
{
public string Nickname { get; set; }
}
}

131
EonaCat.Connections/Helpers/AesKeyExchange.cs Normal file
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using System.Security.Cryptography;
using System.Text;
namespace EonaCat.Connections.Helpers
{
public static class AesKeyExchange
{
private static readonly string Pepper = "EonaCat.Connections.Salt";
/// <summary>
/// Send AES key, IV, and salt to the stream.
/// </summary>
/// <param name="stream"></param>
/// <param name="aes"></param>
/// <returns></returns>
public static async Task<Aes> SendAesKeyAsync(Stream stream, Aes aes)
{
var rawKey = aes.Key;
var iv = aes.IV;
var salt = new byte[32];
using (var rng = RandomNumberGenerator.Create())
{
rng.GetBytes(salt);
}
// Send raw key, IV, and salt
await WriteBytesWithLengthAsync(stream, rawKey);
await WriteBytesWithLengthAsync(stream, iv);
await WriteBytesWithLengthAsync(stream, salt);
await stream.FlushAsync();
// Derive stronger key using PBKDF2-SHA256 + salt + pepper
var derivedKey = PBKDF2_SHA256(Combine(rawKey, Encoding.UTF8.GetBytes(Pepper)), salt, 100_000, 32);
aes.Key = derivedKey;
return aes;
}
/// <summary>
/// Receive AES key, IV, and salt from the stream and derive the AES key.
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static async Task<Aes> ReceiveAesKeyAsync(Stream stream)
{
var rawKey = await ReadBytesWithLengthAsync(stream);
var iv = await ReadBytesWithLengthAsync(stream);
var salt = await ReadBytesWithLengthAsync(stream);
var derivedKey = PBKDF2_SHA256(Combine(rawKey, Encoding.UTF8.GetBytes(Pepper)), salt, 100_000, 32);
Aes _aesEncryption = Aes.Create();
_aesEncryption.Key = derivedKey;
_aesEncryption.IV = iv;
return _aesEncryption;
}
private static byte[] PBKDF2_SHA256(byte[] password, byte[] salt, int iterations, int outputBytes)
{
using (var hmac = new HMACSHA256(password))
{
int hashLength = hmac.HashSize / 8;
int keyBlocks = (int)Math.Ceiling((double)outputBytes / hashLength);
byte[] output = new byte[outputBytes];
byte[] buffer = new byte[hashLength];
for (int block = 1; block <= keyBlocks; block++)
{
byte[] intBlock = BitConverter.GetBytes(block);
if (BitConverter.IsLittleEndian) Array.Reverse(intBlock);
hmac.Initialize();
hmac.TransformBlock(salt, 0, salt.Length, salt, 0);
hmac.TransformFinalBlock(intBlock, 0, intBlock.Length);
Array.Copy(hmac.Hash, buffer, hashLength);
byte[] temp = (byte[])buffer.Clone();
for (int i = 1; i < iterations; i++)
{
temp = hmac.ComputeHash(temp);
for (int j = 0; j < hashLength; j++)
buffer[j] ^= temp[j];
}
int offset = (block - 1) * hashLength;
int remaining = Math.Min(hashLength, outputBytes - offset);
Array.Copy(buffer, 0, output, offset, remaining);
}
return output;
}
}
private static async Task<byte[]> ReadBytesWithLengthAsync(Stream stream)
{
var lengthBytes = new byte[4];
await ReadExactlyAsync(stream, lengthBytes, 0, 4);
int length = BitConverter.ToInt32(lengthBytes, 0);
var data = new byte[length];
await ReadExactlyAsync(stream, data, 0, length);
return data;
}
private static async Task ReadExactlyAsync(Stream stream, byte[] buffer, int offset, int count)
{
int totalRead = 0;
while (totalRead < count)
{
int read = await stream.ReadAsync(buffer, offset + totalRead, count - totalRead);
if (read == 0) throw new EndOfStreamException("Stream ended prematurely");
totalRead += read;
}
}
private static async Task WriteBytesWithLengthAsync(Stream stream, byte[] data)
{
var lengthBytes = BitConverter.GetBytes(data.Length);
await stream.WriteAsync(lengthBytes, 0, 4);
await stream.WriteAsync(data, 0, data.Length);
}
private static byte[] Combine(byte[] a, byte[] b)
{
var c = new byte[a.Length + b.Length];
Buffer.BlockCopy(a, 0, c, 0, a.Length);
Buffer.BlockCopy(b, 0, c, a.Length, b.Length);
return c;
}
}
}

27
EonaCat.Connections/Models/Configuration.cs Normal file
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using System.Security.Cryptography.X509Certificates;
namespace EonaCat.Connections.Models
{
// Configuration class
public class Configuration
{
public bool EnableAutoReconnect { get; set; } = true;
public int ReconnectDelayMs { get; set; } = 5000;
public int MaxReconnectAttempts { get; set; } = 0; // 0 means unlimited attempts
public ProtocolType Protocol { get; set; } = ProtocolType.TCP;
public int Port { get; set; } = 8080;
public string Host { get; set; } = "127.0.0.1";
public bool UseSsl { get; set; } = false;
public X509Certificate2 ServerCertificate { get; set; }
public bool UseAesEncryption { get; set; } = false;
public int BufferSize { get; set; } = 8192;
public int MaxConnections { get; set; } = 100000;
public TimeSpan ConnectionTimeout { get; set; } = TimeSpan.FromSeconds(30);
public bool EnableKeepAlive { get; set; } = true;
public bool EnableNagle { get; set; } = false;
// For testing purposes, allow self-signed certificates
public bool IsSelfSignedEnabled { get; set; } = true;
}
}

23
EonaCat.Connections/Models/Connection.cs Normal file
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using System.Net;
using System.Net.Sockets;
using System.Security.Cryptography;
namespace EonaCat.Connections.Models
{
public class Connection
{
public string Id { get; set; }
public TcpClient TcpClient { get; set; }
public UdpClient UdpClient { get; set; }
public IPEndPoint RemoteEndPoint { get; set; }
public Stream Stream { get; set; }
public string Nickname { get; set; }
public DateTime ConnectedAt { get; set; }
public bool IsSecure { get; set; }
public bool IsEncrypted { get; set; }
public Aes AesEncryption { get; set; }
public CancellationTokenSource CancellationToken { get; set; }
public long BytesSent { get; set; }
public long BytesReceived { get; set; }
}
}

16
EonaCat.Connections/Models/Stats.cs Normal file
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namespace EonaCat.Connections
{
// Connection statistics
public class Stats
{
public int ActiveConnections { get; set; }
public long TotalConnections { get; set; }
public long BytesSent { get; set; }
public long BytesReceived { get; set; }
public long MessagesSent { get; set; }
public long MessagesReceived { get; set; }
public DateTime StartTime { get; set; }
public TimeSpan Uptime => DateTime.UtcNow - StartTime;
public double MessagesPerSecond => MessagesReceived / Math.Max(1, Uptime.TotalSeconds);
}
}

379
EonaCat.Connections/NetworkClient.cs Normal file
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using EonaCat.Connections.EventArguments;
using EonaCat.Connections.Helpers;
using EonaCat.Connections.Models;
using System.Collections.Concurrent;
using System.Net;
using System.Net.Security;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using ErrorEventArgs = EonaCat.Connections.EventArguments.ErrorEventArgs;
namespace EonaCat.Connections
{
public class NetworkClient
{
private readonly Configuration _config;
private TcpClient _tcpClient;
private UdpClient _udpClient;
private Stream _stream;
private Aes _aesEncryption;
private CancellationTokenSource _cancellation;
private bool _isConnected;
public event EventHandler<ConnectionEventArgs> OnConnected;
public event EventHandler<DataReceivedEventArgs> OnDataReceived;
public event EventHandler<ConnectionEventArgs> OnDisconnected;
public event EventHandler<ErrorEventArgs> OnSslError;
public event EventHandler<ErrorEventArgs> OnEncryptionError;
public event EventHandler<ErrorEventArgs> OnGeneralError;
public NetworkClient(Configuration config)
{
_config = config;
}
public async Task ConnectAsync()
{
_cancellation = new CancellationTokenSource();
if (_config.Protocol == ProtocolType.TCP)
{
await ConnectTcpAsync();
}
else
{
await ConnectUdp();
}
}
private async Task ConnectTcpAsync()
{
try
{
_tcpClient = new TcpClient();
await _tcpClient.ConnectAsync(_config.Host, _config.Port);
Stream stream = _tcpClient.GetStream();
// Setup SSL if required
if (_config.UseSsl)
{
try
{
var sslStream = new SslStream(stream, false, userCertificateValidationCallback:RemoteCertificateValidationCallback);
await sslStream.AuthenticateAsClientAsync(_config.Host);
stream = sslStream;
}
catch (Exception ex)
{
OnSslError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "SSL authentication failed" });
return;
}
}
// Setup AES encryption if required
if (_config.UseAesEncryption)
{
try
{
_aesEncryption = await AesKeyExchange.ReceiveAesKeyAsync(stream);
}
catch (Exception ex)
{
OnEncryptionError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "AES setup failed" });
return;
}
}
_stream = stream;
_isConnected = true;
OnConnected?.Invoke(this, new ConnectionEventArgs { ClientId = "self", RemoteEndPoint = new IPEndPoint(IPAddress.Parse(_config.Host), _config.Port) });
// Start receiving data
_ = Task.Run(() => ReceiveDataAsync(), _cancellation.Token);
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Failed to connect" });
}
}
private bool RemoteCertificateValidationCallback(object sender, X509Certificate? certificate, X509Chain? chain, SslPolicyErrors sslPolicyErrors)
{
if (_config.IsSelfSignedEnabled)
{
return true; // Accept self-signed certificates
}
if (sslPolicyErrors == SslPolicyErrors.None)
{
return true; // Certificate is valid
}
// Log or handle the SSL error as needed
OnSslError?.Invoke(this, new ErrorEventArgs
{
Exception = new AuthenticationException("SSL certificate validation failed"),
Message = $"SSL Policy Errors: {sslPolicyErrors}"
});
return false; // Reject the certificate
}
private async Task ConnectUdp()
{
try
{
_udpClient = new UdpClient();
_udpClient.Connect(_config.Host, _config.Port);
_isConnected = true;
OnConnected?.Invoke(this, new ConnectionEventArgs { ClientId = "self", RemoteEndPoint = new IPEndPoint(IPAddress.Parse(_config.Host), _config.Port) });
// Start receiving data
_ = Task.Run(() => ReceiveUdpDataAsync(), _cancellation.Token);
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Failed to connect UDP" });
}
}
private async Task ReceiveDataAsync()
{
var buffer = new byte[_config.BufferSize];
while (!_cancellation.Token.IsCancellationRequested && _isConnected)
{
try
{
var bytesRead = await _stream.ReadAsync(buffer, 0, buffer.Length, _cancellation.Token);
if (bytesRead == 0)
{
break;
}
var data = new byte[bytesRead];
Array.Copy(buffer, data, bytesRead);
await ProcessReceivedDataAsync(data);
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Error receiving data" });
_isConnected = false;
// Start reconnect
_ = Task.Run(() => AutoReconnectAsync());
break;
}
}
await DisconnectAsync();
}
private async Task ReceiveUdpDataAsync()
{
while (!_cancellation.Token.IsCancellationRequested && _isConnected)
{
try
{
var result = await _udpClient.ReceiveAsync();
await ProcessReceivedDataAsync(result.Buffer);
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Error receiving data" });
_isConnected = false;
// Start reconnect
_ = Task.Run(() => AutoReconnectAsync());
break;
}
}
}
private async Task ProcessReceivedDataAsync(byte[] data)
{
try
{
// Decrypt if AES encryption is enabled
if (_config.UseAesEncryption && _aesEncryption != null)
{
data = await DecryptDataAsync(data, _aesEncryption);
}
// Try to decode as string, fallback to binary
bool isBinary = true;
string stringData = null;
try
{
stringData = Encoding.UTF8.GetString(data);
if (Encoding.UTF8.GetBytes(stringData).Length == data.Length)
{
isBinary = false;
}
}
catch
{
// Keep as binary
}
OnDataReceived?.Invoke(this, new DataReceivedEventArgs
{
ClientId = "server",
Data = data,
StringData = stringData,
IsBinary = isBinary
});
}
catch (Exception ex)
{
if (_config.UseAesEncryption)
{
OnEncryptionError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Error decrypting data" });
}
else
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Error processing received data" });
}
}
}
public async Task SendAsync(byte[] data)
{
if (!_isConnected)
{
return;
}
try
{
// Encrypt if AES encryption is enabled
if (_config.UseAesEncryption && _aesEncryption != null)
{
data = await EncryptDataAsync(data, _aesEncryption);
}
if (_config.Protocol == ProtocolType.TCP)
{
await _stream.WriteAsync(data, 0, data.Length);
await _stream.FlushAsync();
}
else
{
await _udpClient.SendAsync(data, data.Length);
}
}
catch (Exception ex)
{
if (_config.UseAesEncryption)
{
OnEncryptionError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Error encrypting/sending data" });
}
else
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Error sending data" });
}
}
}
public async Task SendAsync(string message)
{
await SendAsync(Encoding.UTF8.GetBytes(message));
}
public async Task SendNicknameAsync(string nickname)
{
await SendAsync($"NICKNAME:{nickname}");
}
private async Task<byte[]> EncryptDataAsync(byte[] data, Aes aes)
{
using (var encryptor = aes.CreateEncryptor())
using (var ms = new MemoryStream())
using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
await cs.WriteAsync(data, 0, data.Length);
cs.FlushFinalBlock();
return ms.ToArray();
}
}
private async Task<byte[]> DecryptDataAsync(byte[] data, Aes aes)
{
using (var decryptor = aes.CreateDecryptor())
using (var ms = new MemoryStream(data))
using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
using (var result = new MemoryStream())
{
await cs.CopyToAsync(result);
return result.ToArray();
}
}
private async Task AutoReconnectAsync()
{
if (!_config.EnableAutoReconnect)
{
return;
}
int attempt = 0;
while (!_isConnected && (_config.MaxReconnectAttempts == 0 || attempt < _config.MaxReconnectAttempts))
{
attempt++;
try
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Message = $"Attempting to reconnect (Attempt {attempt})" });
await ConnectAsync();
if (_isConnected)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Message = $"Reconnected successfully after {attempt} attempt(s)" });
break;
}
}
catch
{
// Ignore exceptions, we'll retry
}
await Task.Delay(_config.ReconnectDelayMs);
}
if (!_isConnected)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Message = "Failed to reconnect" });
}
}
public async Task DisconnectAsync()
{
_isConnected = false;
_cancellation?.Cancel();
_tcpClient?.Close();
_udpClient?.Close();
_stream?.Dispose();
_aesEncryption?.Dispose();
OnDisconnected?.Invoke(this, new ConnectionEventArgs { ClientId = "self" });
_ = Task.Run(() => AutoReconnectAsync());
}
public void Dispose()
{
DisconnectAsync().Wait();
_cancellation?.Dispose();
}
}
}

477
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using EonaCat.Connections.EventArguments;
using EonaCat.Connections.Helpers;
using EonaCat.Connections.Models;
using System.Collections.Concurrent;
using System.Net;
using System.Net.Security;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using ErrorEventArgs = EonaCat.Connections.EventArguments.ErrorEventArgs;
namespace EonaCat.Connections
{
public class NetworkServer
{
private readonly Configuration _config;
private readonly Stats _stats;
private readonly ConcurrentDictionary<string, Connection> _clients;
private TcpListener _tcpListener;
private UdpClient _udpListener;
private CancellationTokenSource _serverCancellation;
private readonly object _statsLock = new object();
public event EventHandler<ConnectionEventArgs> OnConnected;
public event EventHandler<NicknameConnectionEventArgs> OnConnectedWithNickname;
public event EventHandler<DataReceivedEventArgs> OnDataReceived;
public event EventHandler<ConnectionEventArgs> OnDisconnected;
public event EventHandler<ErrorEventArgs> OnSslError;
public event EventHandler<ErrorEventArgs> OnEncryptionError;
public event EventHandler<ErrorEventArgs> OnGeneralError;
public NetworkServer(Configuration config)
{
_config = config;
_stats = new Stats { StartTime = DateTime.UtcNow };
_clients = new ConcurrentDictionary<string, Connection>();
}
public Stats GetStats()
{
lock (_statsLock)
{
_stats.ActiveConnections = _clients.Count;
return _stats;
}
}
public async Task StartAsync()
{
_serverCancellation = new CancellationTokenSource();
if (_config.Protocol == ProtocolType.TCP)
{
await StartTcpServerAsync();
}
else
{
await StartUdpServerAsync();
}
}
private async Task StartTcpServerAsync()
{
_tcpListener = new TcpListener(IPAddress.Parse(_config.Host), _config.Port);
_tcpListener.Start();
Console.WriteLine($"TCP Server started on {_config.Host}:{_config.Port}");
while (!_serverCancellation.Token.IsCancellationRequested)
{
try
{
var tcpClient = await _tcpListener.AcceptTcpClientAsync();
_ = Task.Run(() => HandleTcpClientAsync(tcpClient), _serverCancellation.Token);
}
catch (ObjectDisposedException)
{
break;
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Error accepting TCP client" });
}
}
}
private async Task StartUdpServerAsync()
{
_udpListener = new UdpClient(_config.Port);
Console.WriteLine($"UDP Server started on {_config.Host}:{_config.Port}");
while (!_serverCancellation.Token.IsCancellationRequested)
{
try
{
var result = await _udpListener.ReceiveAsync();
_ = Task.Run(() => HandleUdpDataAsync(result), _serverCancellation.Token);
}
catch (ObjectDisposedException)
{
break;
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { Exception = ex, Message = "Error receiving UDP data" });
}
}
}
private async Task HandleTcpClientAsync(TcpClient tcpClient)
{
var clientId = Guid.NewGuid().ToString();
var client = new Connection
{
Id = clientId,
TcpClient = tcpClient,
RemoteEndPoint = (IPEndPoint)tcpClient.Client.RemoteEndPoint,
ConnectedAt = DateTime.UtcNow,
CancellationToken = new CancellationTokenSource()
};
try
{
// Configure TCP client
tcpClient.NoDelay = !_config.EnableNagle;
if (_config.EnableKeepAlive)
{
tcpClient.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
}
Stream stream = tcpClient.GetStream();
// Setup SSL if required
if (_config.UseSsl)
{
try
{
var sslStream = new SslStream(stream, false, userCertificateValidationCallback:RemoteCertificateValidationCallback);
await sslStream.AuthenticateAsServerAsync(_config.ServerCertificate, false, SslProtocols.Tls12, false);
stream = sslStream;
client.IsSecure = true;
}
catch (Exception ex)
{
OnSslError?.Invoke(this, new ErrorEventArgs { ClientId = clientId, Exception = ex, Message = "SSL authentication failed" });
return;
}
}
// Setup AES encryption if required
if (_config.UseAesEncryption)
{
try
{
client.AesEncryption = Aes.Create();
client.AesEncryption.GenerateKey();
client.AesEncryption.GenerateIV();
client.IsEncrypted = true;
// Securely send raw AES key + IV + salt
await AesKeyExchange.SendAesKeyAsync(stream, client.AesEncryption);
}
catch (Exception ex)
{
OnEncryptionError?.Invoke(this, new ErrorEventArgs
{
ClientId = clientId,
Exception = ex,
Message = "AES setup failed"
});
return;
}
}
client.Stream = stream;
_clients[clientId] = client;
lock (_statsLock)
{
_stats.TotalConnections++;
}
OnConnected?.Invoke(this, new ConnectionEventArgs { ClientId = clientId, RemoteEndPoint = client.RemoteEndPoint });
// Handle client communication
await HandleClientCommunicationAsync(client);
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { ClientId = clientId, Exception = ex, Message = "Error handling TCP client" });
}
finally
{
await DisconnectClientAsync(clientId);
}
}
private bool RemoteCertificateValidationCallback(object sender, X509Certificate? certificate, X509Chain? chain, SslPolicyErrors sslPolicyErrors)
{
if (_config.IsSelfSignedEnabled)
{
return true; // Accept self-signed certificates
}
if (sslPolicyErrors == SslPolicyErrors.None)
{
return true; // Certificate is valid
}
// Log or handle the SSL error as needed
OnSslError?.Invoke(this, new ErrorEventArgs
{
Exception = new AuthenticationException("SSL certificate validation failed"),
Message = $"SSL Policy Errors: {sslPolicyErrors}"
});
return false; // Reject the certificate
}
private async Task HandleUdpDataAsync(UdpReceiveResult result)
{
var clientKey = result.RemoteEndPoint.ToString();
if (!_clients.TryGetValue(clientKey, out var client))
{
client = new Connection
{
Id = clientKey,
RemoteEndPoint = result.RemoteEndPoint,
ConnectedAt = DateTime.UtcNow
};
_clients[clientKey] = client;
lock (_statsLock)
{
_stats.TotalConnections++;
}
OnConnected?.Invoke(this, new ConnectionEventArgs { ClientId = clientKey, RemoteEndPoint = result.RemoteEndPoint });
}
await ProcessReceivedDataAsync(client, result.Buffer);
}
private async Task HandleClientCommunicationAsync(Connection client)
{
var buffer = new byte[_config.BufferSize];
while (!client.CancellationToken.Token.IsCancellationRequested && client.TcpClient.Connected)
{
try
{
var bytesRead = await client.Stream.ReadAsync(buffer, 0, buffer.Length, client.CancellationToken.Token);
if (bytesRead == 0)
{
break; // Client disconnected
}
var data = new byte[bytesRead];
Array.Copy(buffer, data, bytesRead);
await ProcessReceivedDataAsync(client, data);
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { ClientId = client.Id, Exception = ex, Message = "Error reading from client" });
break;
}
}
}
private async Task ProcessReceivedDataAsync(Connection client, byte[] data)
{
try
{
// Decrypt if AES encryption is enabled
if (client.IsEncrypted && client.AesEncryption != null)
{
data = await DecryptDataAsync(data, client.AesEncryption);
}
client.BytesReceived += data.Length;
lock (_statsLock)
{
_stats.BytesReceived += data.Length;
_stats.MessagesReceived++;
}
// Try to decode as string, fallback to binary
bool isBinary = true;
string stringData = null;
try
{
stringData = Encoding.UTF8.GetString(data);
// Check if it's valid UTF-8
if (Encoding.UTF8.GetBytes(stringData).Length == data.Length)
{
isBinary = false;
}
}
catch
{
// Keep as binary
}
// Handle special commands
if (!isBinary && stringData.StartsWith("NICKNAME:"))
{
var nickname = stringData.Substring(9);
client.Nickname = nickname;
OnConnectedWithNickname?.Invoke(this, new NicknameConnectionEventArgs
{
ClientId = client.Id,
RemoteEndPoint = client.RemoteEndPoint,
Nickname = nickname
});
return;
}
OnDataReceived?.Invoke(this, new DataReceivedEventArgs
{
ClientId = client.Id,
Data = data,
StringData = stringData,
IsBinary = isBinary
});
}
catch (Exception ex)
{
if (client.IsEncrypted)
{
OnEncryptionError?.Invoke(this, new ErrorEventArgs { ClientId = client.Id, Exception = ex, Message = "Error decrypting data" });
}
else
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { ClientId = client.Id, Exception = ex, Message = "Error processing received data" });
}
}
}
public async Task SendToClientAsync(string clientId, byte[] data)
{
if (_clients.TryGetValue(clientId, out var client))
{
await SendDataAsync(client, data);
}
}
public async Task SendToClientAsync(string clientId, string message)
{
await SendToClientAsync(clientId, Encoding.UTF8.GetBytes(message));
}
public async Task BroadcastAsync(byte[] data)
{
var tasks = new List<Task>();
foreach (var client in _clients.Values)
{
tasks.Add(SendDataAsync(client, data));
}
await Task.WhenAll(tasks);
}
public async Task BroadcastAsync(string message)
{
await BroadcastAsync(Encoding.UTF8.GetBytes(message));
}
private async Task SendDataAsync(Connection client, byte[] data)
{
try
{
// Encrypt if AES encryption is enabled
if (client.IsEncrypted && client.AesEncryption != null)
{
data = await EncryptDataAsync(data, client.AesEncryption);
}
if (_config.Protocol == ProtocolType.TCP)
{
await client.Stream.WriteAsync(data, 0, data.Length);
await client.Stream.FlushAsync();
}
else
{
await _udpListener.SendAsync(data, data.Length, client.RemoteEndPoint);
}
client.BytesSent += data.Length;
lock (_statsLock)
{
_stats.BytesSent += data.Length;
_stats.MessagesSent++;
}
}
catch (Exception ex)
{
if (client.IsEncrypted)
{
OnEncryptionError?.Invoke(this, new ErrorEventArgs { ClientId = client.Id, Exception = ex, Message = "Error encrypting/sending data" });
}
else
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { ClientId = client.Id, Exception = ex, Message = "Error sending data" });
}
}
}
private async Task<byte[]> EncryptDataAsync(byte[] data, Aes aes)
{
using (var encryptor = aes.CreateEncryptor())
using (var ms = new MemoryStream())
using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
await cs.WriteAsync(data, 0, data.Length);
cs.FlushFinalBlock();
return ms.ToArray();
}
}
private async Task<byte[]> DecryptDataAsync(byte[] data, Aes aes)
{
using (var decryptor = aes.CreateDecryptor())
using (var ms = new MemoryStream(data))
using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
using (var result = new MemoryStream())
{
await cs.CopyToAsync(result);
return result.ToArray();
}
}
private async Task DisconnectClientAsync(string clientId)
{
if (_clients.TryRemove(clientId, out var client))
{
try
{
client.CancellationToken?.Cancel();
client.TcpClient?.Close();
client.Stream?.Dispose();
client.AesEncryption?.Dispose();
OnDisconnected?.Invoke(this, new ConnectionEventArgs { ClientId = clientId, RemoteEndPoint = client.RemoteEndPoint });
}
catch (Exception ex)
{
OnGeneralError?.Invoke(this, new ErrorEventArgs { ClientId = clientId, Exception = ex, Message = "Error disconnecting client" });
}
}
}
public void Stop()
{
_serverCancellation?.Cancel();
_tcpListener?.Stop();
_udpListener?.Close();
// Disconnect all clients
var disconnectTasks = new List<Task>();
foreach (var clientId in _clients.Keys.ToArray())
{
disconnectTasks.Add(DisconnectClientAsync(clientId));
}
Task.WaitAll(disconnectTasks.ToArray());
}
public void Dispose()
{
Stop();
_serverCancellation?.Dispose();
}
}
}

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namespace EonaCat.Connections
{
// Protocol types
public enum ProtocolType
{
TCP,
UDP
}
}

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LICENSE
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@ -1,73 +1,204 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
https://EonaCat.com/license/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
OF SOFTWARE BY EONACAT (JEROEN SAEY)
1. Definitions.
1. Definitions.
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"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files.
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including but not limited to software source code, documentation
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"Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types.
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"Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below).
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# EonaCat.Connections
.NET Framework 4.8+ / .NET (Core) compatible library providing high-throughput TCP/UDP
servers and clients with optional TLS (for TCP) and optional application-layer encryption (TCP/UDP).
EonaCat.Connections
## Design goals:
- High performance and low latency
- Scalable to tens of thousands of concurrent connections
- Scalable socket I/O via SocketAsyncEventArgs (SAEA) for raw TCP and UDP
- TLS (SSL) over TCP using SslStream (built-in)
- Optional encryption (AES-CBC + PBKDF2_SHA256) for TCP/UDP payloads
- Minimal allocations, event-driven callbacks
#### - For highest throughput, run x64, enable LargePage, set appropriate Socket options and OS registry tuning.
## Generate self-signed certificate for TLS (TCP):
### Run as Administrator
$cert = New-SelfSignedCertificate `
-DnsName "localhost" `
-CertStoreLocation "Cert:\LocalMachine\My" `
-KeyExportPolicy Exportable `
-NotAfter (Get-Date).AddYears(5) `
-FriendlyName "EonaCat Connections Test Certificate"
$password = ConvertTo-SecureString -String "p@ss" -Force -AsPlainText
Export-PfxCertificate `
-Cert "Cert:\LocalMachine\My\$($cert.Thumbprint)" `
-FilePath "C:\temp\server.pfx" `
-Password $password
#### This will create a self-signed certificate with the password 'p@ss' in the folder C:\temp\server.pfx.
## Server example:
using EonaCat.Connections;
using EonaCat.Connections.Models;
namespace EonaCat.Connections.Server.Example
{
public class Program
{
private static NetworkServer _server;
public static void Main(string[] args)
{
CreateServerAsync().ConfigureAwait(false);
while (true)
{
Console.Write("Enter message to send (or 'exit' to quit): ");
var message = Console.ReadLine();
if (!string.IsNullOrEmpty(message) && message.Equals("exit", StringComparison.OrdinalIgnoreCase))
{
_server.Stop();
_server.Dispose();
Console.WriteLine("Server stopped.");
break;
}
if (!string.IsNullOrEmpty(message))
{
_server.BroadcastAsync(message).ConfigureAwait(false);
}
}
}
private static async Task CreateServerAsync()
{
var config = new Configuration
{
Protocol = ProtocolType.TCP,
Port = 8080,
UseSsl = true,
UseAesEncryption = true,
MaxConnections = 100000,
ServerCertificate = new System.Security.Cryptography.X509Certificates.X509Certificate2("server.pfx", "p@ss"),
};
_server = new NetworkServer(config);
// Subscribe to events
_server.OnConnected += (sender, e) =>
Console.WriteLine($"Client {e.ClientId} connected from {e.RemoteEndPoint}");
_server.OnConnectedWithNickname += (sender, e) =>
Console.WriteLine($"Client {e.ClientId} connected with nickname: {e.Nickname}");
_server.OnDataReceived += async (sender, e) =>
{
Console.WriteLine($"Received from {e.ClientId}: {(e.IsBinary ? $"{e.Data.Length} bytes" : e.StringData)}");
// Echo back the message
if (e.IsBinary)
{
await _server.SendToClientAsync(e.ClientId, e.Data);
}
else
{
await _server.SendToClientAsync(e.ClientId, $"Echo: {e.StringData}");
}
};
_server.OnDisconnected += (sender, e) =>
Console.WriteLine($"Client {e.ClientId} disconnected");
await _server.StartAsync();
}
}
}
## Client example:
using EonaCat.Connections;
using EonaCat.Connections.Models;
namespace EonaCat.Connections.Client.Example
{
public class Program
{
private static NetworkClient _client;
public static void Main(string[] args)
{
CreateClientAsync().ConfigureAwait(false);
while (true)
{
Console.Write("Enter message to send (or 'exit' to quit): ");
var message = Console.ReadLine();
if (!string.IsNullOrEmpty(message) && message.Equals("exit", StringComparison.OrdinalIgnoreCase))
{
_client.DisconnectAsync().ConfigureAwait(false);
break;
}
if (!string.IsNullOrEmpty(message))
{
_client.SendAsync(message).ConfigureAwait(false);
}
}
}
private static async Task CreateClientAsync()
{
var config = new Configuration
{
Protocol = ProtocolType.TCP,
Host = "127.0.0.1",
Port = 8080,
UseSsl = true,
UseAesEncryption = true,
ServerCertificate = new System.Security.Cryptography.X509Certificates.X509Certificate2("client.pfx", "p@ss"),
};
_client = new NetworkClient(config);
// Subscribe to events
_client.OnConnected += (sender, e) =>
Console.WriteLine($"Connected to server at {e.RemoteEndPoint}");
_client.OnDataReceived += (sender, e) =>
Console.WriteLine($"Server says: {(e.IsBinary ? $"{e.Data.Length} bytes" : e.StringData)}");
_client.OnDisconnected += (sender, e) =>
Console.WriteLine("Disconnected from server");
await _client.ConnectAsync();
// Send nickname
await _client.SendNicknameAsync("TestUser");
// Send a message
await _client.SendAsync("Hello server!");
}
}
}