/// <summary>
/// "login" packet. This is the response to the server's login challenge.
/// </summary>
private void OnReceive_Login(NetState ns, GsTcpReader reader)
{
string clientChallenge = reader.GetParameter("challenge"); // 32 chars ASCII upper/lower. Verifies server.
string sessionToken = reader.GetParameter("authtoken"); // identifies account DS wishes to log in with.
string response = reader.GetParameter("response"); // 128bit (as 32char hex) response LOGIN_CHALLENGE.
string firewall = reader.GetParameter("firewall"); // whether the client is behind a firewall.
string port = reader.GetParameter("port"); // port open on the device for communications.
string product = reader.GetParameter("productid"); // GameSpy-specific ID indicating the product attempting to connect to GameSpy.
string gamename = reader.GetParameter("gamename"); // GameSpy-specific name of the game
// string nmspace = reader.GetParameter("nmspace"); // indicates presence of additional login parameters in this packet
int seqNum = int.Parse(reader.GetParameter("id")); // sequence ID of the previous LOGIN_CHALLENGE.
// get account
AccountRequestLogin info = new AccountRequestLogin(sessionToken);
EventSink.InvokeAccountLogin(info);
if (info.IsHandled && info.IsSuccess)
{
// verify client authentication:
string verify = GsMd5Sum.HashChallenge(info.Account.GsLoginPassword, info.Account.GsLoginToken, clientChallenge, ns.GsServerChallenge);
if (verify != response)
{
throw new NetStateMsgException(ns, "sent incorrect LOGIN verification.", reader);
}
// client authenticated! Create server authentication proof and then login client:
string proof = GsMd5Sum.HashChallenge(info.Account.GsLoginPassword, info.Account.GsLoginToken, ns.GsServerChallenge, clientChallenge);
ns.Account = info.Account;
ns.GenerateGamespySessionData();
ns.Account.GenerateGamespyLoginData(info);
Kernel.WriteLine(TypeName, $"{ns} logged in as '{ns.Account}'.");
Send(ns, new GsSmsgLoggedIn(proof, ns, seqNum));
}
else if (info.IsHandled)
{
Send(ns, GsSmsgError.ErrFatalLoginFailed(seqNum));
throw new NetStateMsgException(ns, $"sent wrong credentials: {info.FailReason}", reader);
}
else
{
Send(ns, GsSmsgError.ErrFatalDatabaseError(seqNum));
throw new NetStateMsgException(ns, "sent Login; EventSink did not handle the message.", reader);
}
}