sockscape/server/Socks/MasterIntraServer.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Security.Cryptography;
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using System.Text;
using System.Threading;
using System.Threading.Tasks;
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using Glove;
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using SockScape.DAL;
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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;
private static Dictionary<string, Client> Clients;
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private static UdpClient Sock;
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private static Thread ListeningThread;
private static bool IsOpen;
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public static void Initialize() {
if(IsOpen || ListeningThread != null)
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return;
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MasterServerList.Clear();
Prospects = new Dictionary<string, Client>();
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Clients = new Dictionary<string, Client>();
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();
}
public static void Listener() {
while(IsOpen) {
IPEndPoint endPoint = new IPEndPoint(0, 0);
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while(Sock.Available > 0) {
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var data = Sock.Receive(ref endPoint);
var client = endPoint.ToString();
var encryptor = IsClientConnected(client) ? Clients[client].Encryptor : null;
if(data.Take(Packet.MagicNumber.Length).SequenceEqual(Packet.MagicNumber))
encryptor = null;
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Packet packet =
encryptor == null ? Packet.FromBytes(data)
: Packet.FromBytes(encryptor.Parse(data));
if(packet == null) {
if(encryptor != null)
EncryptionError(endPoint);
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continue;
}
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Clients[client].LastReceive = DateTime.Now;
switch((kIntraSlaveId)packet.Id) {
case kIntraSlaveId.InitiationAttempt:
if(packet.RegionCount != 1 || IsProspectConnected(client))
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break;
if(packet[0] == Configuration.General["Master Secret"]) {
var key = new Key();
Prospects[client] = new Client {
LastReceive = DateTime.Now,
Address = endPoint,
Key = key
};
Send(key.GenerateRequestPacket(), endPoint);
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}
break;
case kIntraSlaveId.KeyExchange:
if(!IsProspectConnected(client))
break;
var privateKey = Prospects[client].Key.ParseResponsePacket(packet);
if(privateKey != -1) {
Prospects[client].LastReceive = DateTime.Now;
Prospects[client].Encryptor = new StreamCipher(privateKey);
Clients[client] = Prospects[client];
Prospects.Remove(client);
} else
Prospects.Remove(client);
break;
case kIntraSlaveId.StatusUpdate:
if(!IsClientConnected(client) || packet.RegionCount < 1)
break;
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if(packet.CheckRegions(0, 1)) {
NegativeAck(endPoint, encryptor, kIntraSlaveId.StatusUpdate, "Server count is malformed.");
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break;
}
byte serverCount = packet[0].Raw[0];
if(packet.RegionCount != 1 + 3 * serverCount) {
NegativeAck(endPoint, encryptor, kIntraSlaveId.StatusUpdate, "Region count does not match server count");
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break;
}
for(byte i = 0; i < serverCount; ++i) {
if(!packet.CheckRegions(2 + 3 * i, 2, 2, 2))
continue;
MasterServerList.Write(new Server {
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Id = packet[2 + 3 * i].Raw.UnpackUInt16(),
UserCount = packet[3 + 3 * i].Raw.UnpackUInt16(),
Address = endPoint.Address,
Port = packet[4 + 3 * i].Raw.UnpackUInt16()
});
}
PositiveAck(endPoint, encryptor, kIntraSlaveId.StatusUpdate);
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break;
}
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}
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Thread.Sleep(1);
}
}
private static void Send(Packet packet, IPEndPoint client) {
Send(packet.GetBytes(), client);
}
private static void Send(byte[] bytes, IPEndPoint client) {
Sock.Send(bytes, bytes.Length, client);
}
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public static void Close() {
IsOpen = false;
ListeningThread.Join();
ListeningThread = null;
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Sock.Dispose();
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}
private static bool IsProspectConnected(string client) {
return Prospects.ContainsKey(client);
}
private static bool IsClientConnected(string client) {
return Clients.ContainsKey(client);
}
private static void PositiveAck(IPEndPoint endPoint, StreamCipher cipher, kIntraSlaveId id) {
Send(cipher.Parse(new Packet(kIntraMasterId.PositiveAck, id).GetBytes()), endPoint);
}
private static void NegativeAck(IPEndPoint endPoint, StreamCipher cipher, kIntraSlaveId id, string message = "An error occurred while parsing a packet.") {
Send(cipher.Parse(new Packet(kIntraMasterId.NegativeAck, id, message).GetBytes()), endPoint);
}
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private static void EncryptionError(IPEndPoint endPoint, string message = "A general encryption error has occurred. Renegotiation required.") {
Send(new Packet(kIntraMasterId.EncryptionError, message), endPoint);
}
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class Client {
public IPEndPoint Address { get; set; }
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public DateTime LastReceive { get; set; }
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public TimeSpan ReceiveDelta => DateTime.Now - LastReceive;
public StreamCipher Encryptor { get; set; }
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public Key Key { get; set; }
}
}
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}