protected void RecvChallengeAck(int our_challenge)
{
byte[] peer_digest;
try
{
OtpInputStream ibuf = Read2BytePackage();
int tag = ibuf.Read1();
if (tag != ChallengeAck)
{
throw new IOException("Handshake protocol error");
}
peer_digest = ibuf.ReadN(16);
byte[] our_digest = GenDigest(our_challenge, Local.Cookie);
if (!peer_digest.SequenceEqual(our_digest))
{
throw new OtpAuthException("Peer authentication error.");
}
}
catch (OtpDecodeException e)
{
throw new IOException("Handshake failed - not enough data", e);
}
catch (Exception e)
{
Logger.Error("Peer authentication error", e);
throw new OtpAuthException("Peer authentication error.", e);
}
if (TraceLevel >= TraceHandshake)
{
Logger.Debug($"<- HANDSHAKE recvChallengeAck from={Peer.Node} digest={Hex(peer_digest)} local={Local}");
}
}
private async Task Port_R4(IOtpTransport socket, OtpInputStream ibuf)
{
try
{
int len = (int)(ibuf.Length - 1);
byte[] alive = ibuf.ReadN(len);
string name = OtpErlangString.FromEncoding(alive);
if (traceLevel >= traceThreshold)
{
Logger.Debug($"<- PORT (r4) {name}");
}
if (!portmap.TryGetValue(name, out AbstractNode node))
{
node = null;
}
OtpOutputStream obuf = new OtpOutputStream();
if (node != null)
{
obuf.Write1(port4resp);
obuf.Write1(0);
obuf.Write2BE(node.Port);
obuf.Write1(node.Type);
obuf.Write1(node.Proto);
obuf.Write2BE(node.DistHigh);
obuf.Write2BE(node.DistLow);
obuf.Write2BE(len);
obuf.WriteN(alive);
obuf.Write2BE(0);
if (traceLevel >= traceThreshold)
{
Logger.Debug("-> 0 (success)");
}
}
else
{
obuf.Write1(port4resp);
obuf.Write1(1);
if (traceLevel >= traceThreshold)
{
Logger.Debug("-> 1 (failure)");
}
}
await obuf.WriteToAsync(socket.OutputStream);
}
catch (IOException e)
{
if (traceLevel >= traceThreshold)
{
Logger.Debug("<- (no response)");
}
throw new IOException("Request not responding", e);
}
}