private async Task RunHeartbeatAsync(int interval, CancellationToken token)
{
#region Valve sucks at naming enum members
/*
* Let me tell you a story about 10/14/2017
* So I was working on this lib ironing out some kinks, rewriting the connection code
* when I finally completed it and decided to test it. So I pop open a console just to
* find obvious bugs like the whole thing exploding for no reason. Suddenly at about 5:08 PM
* it starts working properly. Stuff starts printing in the console and it's working properly.
* It works correctly until about 20 seconds later when the console window vanishes and up pops an error
* "IOException: Unable to transfer data" bla bla bla BASICALLY the connection was aborted.
* This brought up another bug in my TCP client where I wouldn't actually tell anyone the connection disconnected,
* but who cares about that. This brought in a more important problem: Steam drops my connection even though my heart is beating
* So I try a WebSocket. Same thing. Check the headers (because there's nothing the in body), everything lines up.
* I reference the SteamKit, everything related to serialization is in order. Everything is right except one thing.
* One small piece that nobody would notice.
* The correct message type for a heartbeat is "ClientHeartBeat", not "Heartbeat"...
* I found this out after 3 hours. Please kill me.
*
*
* TLDR: Valve sucks at naming enum members.
*/
#endregion
// cache the data so we don't serialize 500 times per session. Our session ID will never change and neither will our Steam ID
var beat = NetworkMessage.CreateProtobufMessage(MessageType.ClientHeartBeat, new CMsgClientHeartBeat()).WithClientInfo(SteamId, SessionId).Serialize();
try
{
await NetLog.DebugAsync($"Heartbeat started on a {interval} ms interval").ConfigureAwait(false);
while (!token.IsCancellationRequested)
{
await Task.Delay(interval, token).ConfigureAwait(false);
try
{
await SendAsync(beat).ConfigureAwait(false);
}
catch (Exception ex)
{
await NetLog.ErrorAsync($"The heartbeat task encountered an unknown exception while sending the heartbeat message", ex).ConfigureAwait(false);
}
}
}
catch (OperationCanceledException)
{
await NetLog.DebugAsync("Heartbeat stopped").ConfigureAwait(false);
}
catch (Exception ex)
{
await NetLog.ErrorAsync($"The heartbeat task encountered an unknown exception", ex).ConfigureAwait(false);
}
}
private async Task ProcessEncryptRequest(NetworkMessage message)
{
ChannelEncryptRequest encryptRequest = message.Deserialize <ChannelEncryptRequest>();
await NetLog.VerboseAsync($"Encrypting channel on protocol version {encryptRequest.ProtocolVersion} in universe {encryptRequest.Universe}").ConfigureAwait(false);
byte[] challange = encryptRequest.Challenge.All(b => b == 0) ? encryptRequest.Challenge : null; // check if all the values were made 0 by the marshal
byte[] publicKey = UniverseUtils.GetPublicKey(encryptRequest.Universe);
if (publicKey == null)
{
await NetLog.ErrorAsync($"Cannot find public key for universe {encryptRequest.Universe}").ConfigureAwait(false);
throw new InvalidOperationException($"Public key does not exist for universe {encryptRequest.Universe}");
}
byte[] tempSessionKey = CryptoUtils.GenerateBytes(32);
byte[] encryptedHandshake = null;
using (RsaCrypto rsa = new RsaCrypto(publicKey))
{
if (challange != null)
{
byte[] handshakeToEncrypt = new byte[tempSessionKey.Length + challange.Length];
Array.Copy(tempSessionKey, handshakeToEncrypt, tempSessionKey.Length);
Array.Copy(challange, 0, handshakeToEncrypt, tempSessionKey.Length, challange.Length);
encryptedHandshake = rsa.Encrypt(handshakeToEncrypt);
}
else
{
encryptedHandshake = rsa.Encrypt(tempSessionKey);
}
}
Encryption = challange != null ? (IEncryptor) new HmacEncryptor(tempSessionKey) : new SimpleEncryptor(tempSessionKey);
var encryptResponse = NetworkMessage.CreateMessage(MessageType.ChannelEncryptResponse, new ChannelEncryptResponse
{
KeySize = 128,
KeyHash = CryptoUtils.CrcHash(encryptedHandshake),
EncryptedHandshake = encryptedHandshake,
ProtocolVersion = 1,
});
await SendAsync(encryptResponse).ConfigureAwait(false);
}