public void C2S_PING(GameConnection conn, Packet packet)
{
Log.Info("Received ping from " + conn.Character.Name);
var currentServerTick = (uint)(int.MaxValue & (Environment.TickCount - conn.Character.Handle));
var cTick = new MSG_CHK_TIMETICK();
var buffer = packet.GetBuffer();
cTick.Deserialize(ref buffer);
if (conn.Character.ClientTick == 0)
{
conn.Character.PreviousServerTick = currentServerTick;
conn.Character.ClientTick = cTick.ClientTick;
conn.Character.PreviousTickCount = cTick.TickCount;
return;
}
if (cTick.TickCount - conn.Character.PreviousTickCount != 1)
{
Log.Info(string.Format("[Index] {0} {1} {2} Pre:{3} now:{4} SendTime:{5} {6}", conn.Character.Account.Username, conn.Character.Name, conn.Character.IPAddress, conn.Character.CurrentTickCount, cTick.TickCount, cTick.ClientTick - conn.Character.ClientTick, currentServerTick - conn.Character.CurrentServerTick));
conn.Character.CurrentTickCount = cTick.TickCount++;
conn.Character.CurrentTickCount = cTick.TickCount;
return;
}
if (cTick.ServerTick != conn.Character.CurrentServerTick)
{
Log.Info(string.Format("[Hack] {0} {1} {2} Changed SvrTick:{3}->{4} {5}", conn.Character.Account.Username, conn.Character.Name, conn.Character.IPAddress, conn.Character.CurrentServerTick, cTick.ServerTick, currentServerTick - conn.Character.CurrentServerTick));
// TODO: Handle speed hackers
return;
}
var serverTickDiff = Math.Abs(currentServerTick - conn.Character.PreviousServerTick);
var clientTickDiff = Math.Abs(cTick.ClientTick - conn.Character.ClientTick);
if (Math.Abs(serverTickDiff - clientTickDiff) > 500)
{
if (++conn.Character.TickErrorCount > 1)
{
Log.Info(string.Format("[Hack] {0} {1} {2} {3} {4} {5}", conn.Character.Account.Username, conn.Character.Name, conn.Character.IPAddress, serverTickDiff, clientTickDiff, currentServerTick - conn.Character.CurrentServerTick));
// TODO: Handle speed hackers
return;
}
conn.Character.PreviousTickCount = cTick.TickCount;
conn.Character.ClientTick = cTick.ClientTick;
conn.Character.PreviousServerTick = currentServerTick;
return;
}
conn.Character.PreviousTickCount = cTick.TickCount;
conn.Character.ClientTick = cTick.ClientTick;
conn.Character.PreviousServerTick = currentServerTick;
conn.Character.TickErrorCount = 0;
}
public void PingCharacters()
{
foreach (var character in this._characters.Values)
{
if (character.CurrentState == Shared.Const.PlayerState.STANDBY)
{
continue;
}
var msg = new MSG_CHK_TIMETICK();
character.CurrentServerTick = (uint)(int.MaxValue & (Environment.TickCount - character.Handle));
msg.TickCount = character.CurrentTickCount++;
msg.ServerTick = character.CurrentServerTick;
character.GameConnection.NoEncryptSend(msg.Serialize());
Shared.Util.Log.Info("Sent ping to " + character.Name);
}
}