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196 lines (164 loc) · 5.35 KB
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using System;
using System.Net;
using NetcodeIO.NET.Utils;
namespace NetcodeIO.NET
{
internal class EncryptionManager
{
internal struct encryptionMapEntry
{
public double ExpireTime;
public double LastAccessTime;
public int TimeoutSeconds;
public uint ClientID;
public EndPoint Address;
public byte[] SendKey;
public byte[] ReceiveKey;
public void Reset()
{
ExpireTime = -1.0;
LastAccessTime = -1000.0;
Address = null;
TimeoutSeconds = 0;
ClientID = 0;
Array.Clear(SendKey, 0, SendKey.Length);
Array.Clear(ReceiveKey, 0, ReceiveKey.Length);
}
}
internal int numEncryptionMappings;
internal encryptionMapEntry[] encryptionMappings;
public EncryptionManager(int maxClients)
{
encryptionMappings = new encryptionMapEntry[maxClients * 4];
for (int i = 0; i < encryptionMappings.Length; i++)
{
encryptionMappings[i].SendKey = new byte[32];
encryptionMappings[i].ReceiveKey = new byte[32];
}
Reset();
}
public void Reset()
{
numEncryptionMappings = 0;
for (int i = 0; i < encryptionMappings.Length; i++)
{
encryptionMappings[i].Reset();
}
}
public bool AddEncryptionMapping(EndPoint address, byte[] sendKey, byte[] receiveKey, double time, double expireTime, int timeoutSeconds, uint clientID)
{
for (int i = 0; i < numEncryptionMappings; i++)
{
if (MiscUtils.AddressEqual(encryptionMappings[i].Address, address)
&& ( timeoutSeconds >= 0 && encryptionMappings[i].LastAccessTime + timeoutSeconds >= time ))
{
encryptionMappings[i].ExpireTime = expireTime;
encryptionMappings[i].LastAccessTime = time;
encryptionMappings[i].TimeoutSeconds = timeoutSeconds;
encryptionMappings[i].ClientID = clientID;
Buffer.BlockCopy(sendKey, 0, encryptionMappings[i].SendKey, 0, 32);
Buffer.BlockCopy(receiveKey, 0, encryptionMappings[i].ReceiveKey, 0, 32);
return true;
}
}
for (int i = 0; i < encryptionMappings.Length; i++)
{
if ((timeoutSeconds >= 0 && encryptionMappings[i].LastAccessTime + timeoutSeconds < time) ||
(encryptionMappings[i].ExpireTime >= 0.0 && encryptionMappings[i].ExpireTime < time))
{
encryptionMappings[i].Address = address;
encryptionMappings[i].ExpireTime = expireTime;
encryptionMappings[i].LastAccessTime = time;
encryptionMappings[i].TimeoutSeconds = timeoutSeconds;
encryptionMappings[i].ClientID = clientID;
Buffer.BlockCopy(sendKey, 0, encryptionMappings[i].SendKey, 0, 32);
Buffer.BlockCopy(receiveKey, 0, encryptionMappings[i].ReceiveKey, 0, 32);
if (i + 1 > numEncryptionMappings)
numEncryptionMappings = i + 1;
return true;
}
}
return false;
}
public bool RemoveEncryptionMapping(EndPoint address, double time)
{
for (int i = 0; i < numEncryptionMappings; i++)
{
if (MiscUtils.AddressEqual(encryptionMappings[i].Address, address))
{
encryptionMappings[i].Reset();
if (i + 1 == numEncryptionMappings)
{
int index = i - 1;
while (index >= 0)
{
if ((encryptionMappings[i].TimeoutSeconds < 0 || encryptionMappings[index].LastAccessTime + encryptionMappings[i].TimeoutSeconds >= time ) &&
(encryptionMappings[index].ExpireTime < 0 || encryptionMappings[index].ExpireTime > time))
break;
index--;
}
numEncryptionMappings = index + 1;
}
return true;
}
}
return false;
}
public byte[] GetSendKey(int idx)
{
if (idx == -1 || idx >= encryptionMappings.Length) return null;
return encryptionMappings[idx].SendKey;
}
public byte[] GetReceiveKey(int idx)
{
if (idx == -1 || idx >= encryptionMappings.Length) return null;
return encryptionMappings[idx].ReceiveKey;
}
public int GetTimeoutSeconds(int idx)
{
if (idx == -1 || idx >= encryptionMappings.Length) return -1;
return encryptionMappings[idx].TimeoutSeconds;
}
public uint GetClientID(int idx)
{
if (idx == -1 || idx >= encryptionMappings.Length) return 0;
return encryptionMappings[idx].ClientID;
}
public void SetClientID(int idx, uint clientID)
{
if (idx < 0 || idx >= numEncryptionMappings)
throw new IndexOutOfRangeException();
encryptionMappings[idx].ClientID = clientID;
}
public bool Touch(int index, EndPoint address, double time)
{
if (index < 0 || index >= numEncryptionMappings)
throw new IndexOutOfRangeException();
if (!MiscUtils.AddressEqual(encryptionMappings[index].Address, address))
return false;
encryptionMappings[index].LastAccessTime = time;
encryptionMappings[index].ExpireTime = time + Defines.NETCODE_TIMEOUT_SECONDS;
return true;
}
public void SetExpireTime(int index, double expireTime)
{
if (index < 0 || index >= numEncryptionMappings)
throw new IndexOutOfRangeException();
encryptionMappings[index].ExpireTime = expireTime;
}
public int FindEncryptionMapping(EndPoint address, double time)
{
for (int i = 0; i < numEncryptionMappings; i++)
{
if (MiscUtils.AddressEqual(encryptionMappings[i].Address, address) &&
(encryptionMappings[i].LastAccessTime + encryptionMappings[i].TimeoutSeconds >= time || encryptionMappings[i].TimeoutSeconds < 0) &&
(encryptionMappings[i].ExpireTime < 0.0 || encryptionMappings[i].ExpireTime >= time))
{
encryptionMappings[i].LastAccessTime = time;
return i;
}
}
return -1;
}
}
}