protected int RecvChallenge()
{
int challenge;
try
{
OtpInputStream ibuf = Read2BytePackage();
int namelen;
switch (ibuf.Read1())
{
case 'n':
if (Peer.DistChoose != 5)
{
throw new IOException("Old challenge wrong version");
}
Peer.DistLow = Peer.DistHigh = ibuf.Read2BE();
Peer.CapFlags = ibuf.Read4BE();
if ((Peer.CapFlags & AbstractNode.dFlagHandshake23) != 0)
{
throw new IOException("Old challenge unexpected DFLAG_HANDHAKE_23");
}
challenge = ibuf.Read4BE();
namelen = (int)ibuf.Length - (1 + 2 + 4 + 4);
break;
case 'N':
Peer.DistLow = Peer.DistHigh = Peer.DistChoose = 6;
Peer.CapFlags = ibuf.Read8BE();
if ((Peer.CapFlags & AbstractNode.dFlagHandshake23) == 0)
{
throw new IOException("New challenge missing DFLAG_HANDHAKE_23");
}
challenge = ibuf.Read4BE();
Peer.Creation = ibuf.Read4BE();
namelen = ibuf.Read2BE();
break;
default:
throw new IOException("Unexpected peer type");
}
string hisname = ibuf.ReadStringData(namelen);
if (!hisname.Equals(Peer.Node))
{
throw new IOException("Handshake failed - peer has wrong name: " + hisname);
}
if ((Peer.CapFlags & AbstractNode.dFlagExtendedReferences) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended references");
}
if ((Peer.CapFlags & AbstractNode.dFlagExtendedPidsPorts) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended pids and ports");
}
}
catch (OtpDecodeException e)
{
throw new IOException("Handshake failed - not enough data", e);
}
if (TraceLevel >= TraceHandshake)
{
Logger.Debug($"<- HANDSHAKE recvChallenge from={Peer.Node} challenge={challenge} local={Local}");
}
return(challenge);
}
protected int RecvName()
{
int nameTag;
string hisname;
try
{
OtpInputStream ibuf = Read2BytePackage();
nameTag = ibuf.Read1();
switch (nameTag)
{
case 'n':
Peer.DistLow = Peer.DistHigh = ibuf.Read2BE();
if (Peer.DistLow != 5)
{
throw new IOException("Invalid handshake version");
}
Peer.CapFlags = ibuf.Read4BE();
hisname = ibuf.ReadStringData((int)ibuf.Length - 7);
break;
case 'N':
Peer.DistLow = Peer.DistHigh = 6;
Peer.CapFlags = ibuf.Read8BE();
if ((Peer.CapFlags & AbstractNode.dFlagHandshake23) == 0)
{
throw new IOException("Missing DFLAG_HANDSHAKE_23");
}
Peer.Creation = ibuf.Read4BE();
hisname = ibuf.ReadStringData();
break;
default:
throw new IOException("Unknown remote node type");
}
if ((Peer.CapFlags & AbstractNode.dFlagExtendedReferences) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended references");
}
if ((Peer.CapFlags & AbstractNode.dFlagExtendedPidsPorts) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended pids and ports");
}
}
catch (OtpDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
Peer.Node = hisname;
if (Peer.Alive == null || Peer.Host == null)
{
throw new IOException("Handshake failed - peer name invalid: " + hisname);
}
if (TraceLevel >= TraceHandshake)
{
Logger.Debug($"<- HANDSHAKE ntype={Peer.Type} dist={Peer.DistHigh} remote={Peer}");
}
return(nameTag);
}
