public static BitcoinVersionPayload CreateVersionPayload(string userAgent, byte[] nonce, IPEndPoint sender,
IPEndPoint receiver)
{
var now = DateTimeOffset.UtcNow;
var bitcoinVersionPayload = new BitcoinVersionPayload(
new BitcoinVarString(userAgent),
nonce,
new BitcoinNetworkAddressPayload(now, ChatClientConfiguration.PeerServices, sender.Address, sender.Port),
new BitcoinNetworkAddressPayload(now, PeerServices.Network, receiver.Address, receiver.Port));
return(bitcoinVersionPayload);
}
public async Task VersionHandshakeAsync(string userAgent, byte[] nonce, CancellationToken cancellationToken)
{
try
{
BitcoinVersionPayload outgoingVersionPayload = PayloadFactory.CreateVersionPayload(userAgent, nonce,
(IPEndPoint)this._tcpClient.Client.LocalEndPoint,
(IPEndPoint)this._tcpClient.Client.RemoteEndPoint);
var myVersionMessage = new BitcoinMessage("version", outgoingVersionPayload.Serialize());
this._logger.LogInformation("Sending own version.");
await WriteAsync(myVersionMessage.Serialize());
this._logger.LogInformation("'version' sent.");
// do it like this so that there is no specific expected order for version and verack, but expect both.
while (this.PeerVersionPayload == null || this.PeerVerAckReceived == false)
{
var reply = await ReadMessageAsync(cancellationToken);
if (reply.Command == "version")
{
this.PeerVersionPayload = new BitcoinVersionPayload(reply.PayloadBytes);
this._logger.LogInformation(
$"Version payload decoded from {this.PeerVersionPayload.UserAgent.Text} at {this.PeerVersionPayload.Sender}.");
this._logger.LogInformation($"Setting own address to {this.PeerVersionPayload.Receiver}.");
this.SelfFromPeer = this.PeerVersionPayload.Receiver.ToPeer();
this._logger.LogInformation("Sending version acknowledgement.");
await WriteAsync(new BitcoinMessage("verack", new byte[0]).Serialize());
this._logger.LogInformation("'verack' sent.");
}
else if (reply.Command == "verack")
{
this.PeerVerAckReceived = true;
}
else
{
throw new InvalidOperationException(
$"Received unexpected message '{reply.Command}' during handshake.");
}
}
}
catch (Exception e)
{
DisposeAndThrow(e);
}
}