void InterpretServerOrder(Connection conn, Order o)
{
lock (LobbyInfo)
{
// Only accept handshake responses from unvalidated clients
// Anything else may be an attempt to exploit the server
if (!conn.Validated)
{
if (o.OrderString == "HandshakeResponse")
{
ValidateClient(conn, o.TargetString);
}
else
{
Log.Write("server", "Rejected connection from {0}; Order `{1}` is not a `HandshakeResponse`.",
conn.Socket.RemoteEndPoint, o.OrderString);
DropClient(conn);
}
return;
}
switch (o.OrderString)
{
case "Command":
{
var handledBy = serverTraits.WithInterface <IInterpretCommand>()
.FirstOrDefault(t => t.InterpretCommand(this, conn, GetClient(conn), o.TargetString));
if (handledBy == null)
{
Log.Write("server", "Unknown server command: {0}", o.TargetString);
SendOrderTo(conn, "Message", "Unknown server command: {0}".F(o.TargetString));
}
break;
}
case "Chat":
DispatchOrdersToClients(conn, 0, o.Serialize());
break;
case "Pong":
{
if (!OpenRA.Exts.TryParseInt64Invariant(o.TargetString, out var pingSent))
{
Log.Write("server", "Invalid order pong payload: {0}", o.TargetString);
break;
}
var client = GetClient(conn);
if (client == null)
{
return;
}
var pingFromClient = LobbyInfo.PingFromClient(client);
if (pingFromClient == null)
{
return;
}
var history = pingFromClient.LatencyHistory.ToList();
history.Add(Game.RunTime - pingSent);
// Cap ping history at 5 values (25 seconds)
if (history.Count > 5)
{
history.RemoveRange(0, history.Count - 5);
}
pingFromClient.Latency = history.Sum() / history.Count;
pingFromClient.LatencyJitter = (history.Max() - history.Min()) / 2;
pingFromClient.LatencyHistory = history.ToArray();
SyncClientPing();
break;
}
case "GameSaveTraitData":
{
if (GameSave != null)
{
var data = MiniYaml.FromString(o.TargetString)[0];
GameSave.AddTraitData(int.Parse(data.Key), data.Value);
}
break;
}
case "CreateGameSave":
{
if (GameSave != null)
{
// Sanitize potentially malicious input
var filename = o.TargetString;
var invalidIndex = -1;
var invalidChars = Path.GetInvalidFileNameChars();
while ((invalidIndex = filename.IndexOfAny(invalidChars)) != -1)
{
filename = filename.Remove(invalidIndex, 1);
}
var baseSavePath = Platform.ResolvePath(
Platform.SupportDirPrefix,
"Saves",
ModData.Manifest.Id,
ModData.Manifest.Metadata.Version);
if (!Directory.Exists(baseSavePath))
{
Directory.CreateDirectory(baseSavePath);
}
GameSave.Save(Path.Combine(baseSavePath, filename));
DispatchOrdersToClients(null, 0, Order.FromTargetString("GameSaved", filename, true).Serialize());
}
break;
}
case "LoadGameSave":
{
if (Type == ServerType.Dedicated || State >= ServerState.GameStarted)
{
break;
}
// Sanitize potentially malicious input
var filename = o.TargetString;
var invalidIndex = -1;
var invalidChars = Path.GetInvalidFileNameChars();
while ((invalidIndex = filename.IndexOfAny(invalidChars)) != -1)
{
filename = filename.Remove(invalidIndex, 1);
}
var savePath = Platform.ResolvePath(
Platform.SupportDirPrefix,
"Saves",
ModData.Manifest.Id,
ModData.Manifest.Metadata.Version,
filename);
GameSave = new GameSave(savePath);
LobbyInfo.GlobalSettings = GameSave.GlobalSettings;
LobbyInfo.Slots = GameSave.Slots;
// Reassign clients to slots
// - Bot ordering is preserved
// - Humans are assigned on a first-come-first-serve basis
// - Leftover humans become spectators
// Start by removing all bots and assigning all players as spectators
foreach (var c in LobbyInfo.Clients)
{
if (c.Bot != null)
{
LobbyInfo.Clients.Remove(c);
var ping = LobbyInfo.PingFromClient(c);
if (ping != null)
{
LobbyInfo.ClientPings.Remove(ping);
}
}
else
{
c.Slot = null;
}
}
// Rebuild/remap the saved client state
// TODO: Multiplayer saves should leave all humans as spectators so they can manually pick slots
var adminClientIndex = LobbyInfo.Clients.First(c => c.IsAdmin).Index;
foreach (var kv in GameSave.SlotClients)
{
if (kv.Value.Bot != null)
{
var bot = new Session.Client()
{
Index = ChooseFreePlayerIndex(),
State = Session.ClientState.NotReady,
BotControllerClientIndex = adminClientIndex
};
kv.Value.ApplyTo(bot);
LobbyInfo.Clients.Add(bot);
}
else
{
// This will throw if the server doesn't have enough human clients to fill all player slots
// See TODO above - this isn't a problem in practice because MP saves won't use this
var client = LobbyInfo.Clients.First(c => c.Slot == null);
kv.Value.ApplyTo(client);
}
}
SyncLobbyInfo();
SyncLobbyClients();
SyncClientPing();
break;
}
}
}
}
