140 lines
5 KiB
C#
140 lines
5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using Glove;
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using SockScape.Encryption;
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namespace SockScape {
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static class MasterUdpServer {
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private static Dictionary<string, Client> Prospects;
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private static Dictionary<string, Client> Clients;
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private static ServerList Servers;
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private static UdpClient Sock;
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private static Thread ListeningThread;
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private static bool IsOpen;
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public static void Initialize() {
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if(IsOpen || ListeningThread != null)
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return;
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Servers = new ServerList();
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Prospects = new Dictionary<string, Client>();
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Clients = new Dictionary<string, Client>();
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ushort port = (ushort)Configuration.General["Master Port"];
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Sock = new UdpClient(new IPEndPoint(IPAddress.Any, port));
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IsOpen = true;
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ListeningThread = new Thread(Listener);
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ListeningThread.Start();
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}
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public static void Listener() {
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while(IsOpen) {
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IPEndPoint endPoint = new IPEndPoint(0, 0);
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while(Sock.Available > 0) {
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var data = Sock.Receive(ref endPoint);
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var client = endPoint.ToString();
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var encryptor = IsClientConnected(client) ? Clients[client].Encryptor : null;
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if(data.Take(Packet.MagicNumber.Length).SequenceEqual(Packet.MagicNumber))
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encryptor = null;
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Packet packet =
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encryptor == null ? Packet.FromBytes(data)
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: Packet.FromBytes(encryptor.Parse(data));
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if(packet == null)
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break;
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switch((kIntraSlaveId)packet.Id) {
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case kIntraSlaveId.InitiationAttempt:
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if(packet.RegionCount != 1 || IsProspectConnected(client))
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break;
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if(packet[0] == Configuration.General["Master Secret"]) {
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var key = new Key();
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Prospects[client] = new Client {
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LastReceive = DateTime.Now,
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Address = endPoint,
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Key = key
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};
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Send(key.GenerateRequestPacket(), endPoint);
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}
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break;
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case kIntraSlaveId.KeyExchange:
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if(!IsProspectConnected(client))
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break;
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var privateKey = Prospects[client].Key.ParseResponsePacket(packet);
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if(privateKey != -1) {
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Prospects[client].Encryptor = new Cipher(privateKey);
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Clients[client] = Prospects[client];
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Prospects.Remove(client);
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} else
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Prospects.Remove(client);
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break;
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case kIntraSlaveId.StatusUpdate:
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if(!IsClientConnected(client) || packet.RegionCount < 1)
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break;
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break;
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}
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}
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Thread.Sleep(1);
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}
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}
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private static void Send(Packet packet, IPEndPoint client) {
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var message = packet.GetBytes();
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Sock.Send(message, message.Length, client);
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}
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public static void Close() {
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IsOpen = false;
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ListeningThread.Join();
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ListeningThread = null;
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Sock.Dispose();
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}
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private static bool IsProspectConnected(string client) {
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return Prospects.ContainsKey(client);
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}
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private static bool IsClientConnected(string client) {
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return Clients.ContainsKey(client);
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}
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private static Packet PositiveAck(byte id) {
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return new Packet(kIntraMasterId.PositiveAck, id);
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}
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private static Packet NegativeAck(byte id, string message = "") {
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return new Packet(kIntraMasterId.NegativeAck, id, message);
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}
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private static Packet EncryptionError(string message = "A general encryption error has occurred.") {
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return new Packet(kIntraMasterId.EncryptionError, message);
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}
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class Client {
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public IPEndPoint Address { get; set; }
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public DateTime LastReceive { get; set; }
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public Cipher Encryptor { get; set; }
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public Key Key { get; set; }
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}
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}
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}
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