protected int RecvChallengeReply(int our_challenge)
{
int challenge;
byte[] peer_digest;
try
{
OtpInputStream ibuf = Read2BytePackage();
int tag = ibuf.Read1();
if (tag != ChallengeReply)
{
throw new IOException("Handshake protocol error");
}
challenge = ibuf.Read4BE();
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);
}
if (TraceLevel >= TraceHandshake)
{
Logger.Debug($"<- HANDSHAKE recvChallengeReply from={Peer.Node} challenge={challenge} digest={Hex(peer_digest)} local={Local}");
}
return(challenge);
}
protected void RecvComplement(int send_name_tag)
{
if (send_name_tag == 'n' && (Peer.CapFlags & AbstractNode.dFlagHandshake23) != 0)
{
try
{
OtpInputStream ibuf = Read2BytePackage();
if (ibuf.Read1() != 'c')
{
throw new IOException("Not a complement tag");
}
long flagsHigh = ibuf.Read4BE();
Peer.CapFlags |= flagsHigh << 32;
Peer.Creation = ibuf.Read4BE();
}
catch (OtpDecodeException e)
{
throw new IOException("Handshake failed - not enough data", e);
}
}
}
public override void Run()
{
if (!Connected)
{
Deliver(new IOException("Not connected"));
return;
}
byte[] lbuf = new byte[4];
int len;
try
{
while (!Stopping)
{
// don't return until we get a real message
// or a failure of some kind (e.g. EXIT)
// read length and read buffer must be atomic!
// read 4 bytes - get length of incoming packet
ReadSock(lbuf);
OtpInputStream ibuf = new OtpInputStream(lbuf)
{
Flags = Local.Flags
};
len = ibuf.Read4BE();
// received tick? send tock!
if (len == 0)
{
lock (objWrite)
{
socket.OutputStream.Write(TOCK, 0, TOCK.Length);
socket.OutputStream.Flush();
}
continue;
}
// got a real message (maybe) - read len bytes
byte[] tmpbuf = new byte[len];
ReadSock(tmpbuf);
ibuf = new OtpInputStream(tmpbuf)
{
Flags = Local.Flags
};
if (ibuf.Read1() != passThrough)
{
continue;
}
// got a real message (really)
IOtpErlangObject reason = null;
OtpErlangAtom cookie = null;
IOtpErlangObject tmp = null;
OtpErlangTuple head = null;
OtpErlangAtom toName;
OtpErlangPid to;
OtpErlangPid from;
int tag;
// decode the header
tmp = ibuf.ReadAny();
if (!(tmp is OtpErlangTuple))
{
continue;
}
head = (OtpErlangTuple)tmp;
if (!(head.ElementAt(0) is OtpErlangLong))
{
continue;
}
// lets see what kind of message this is
tag = (int)((OtpErlangLong)head.ElementAt(0)).LongValue();
switch (tag)
{
case sendTag: // { SEND, Cookie, ToPid }
case sendTTTag: // { SEND, Cookie, ToPid, TraceToken }
if (!cookieOk)
{
// we only check this once, he can send us bad cookies later if he likes
if (!(head.ElementAt(1) is OtpErlangAtom))
{
continue;
}
cookie = (OtpErlangAtom)head.ElementAt(1);
if (sendCookie)
{
if (cookie.Value != Local.Cookie)
{
CookieError(Local, cookie);
}
}
else
{
if (cookie.Value != "")
{
CookieError(Local, cookie);
}
}
cookieOk = true;
}
if (TraceLevel >= TraceSend)
{
Logger.Debug($"<- {HeaderType(head)} {head}");
/* show received payload too */
ibuf.Mark();
Logger.Debug($" {ibuf.ReadAny()}");
ibuf.Reset();
}
to = (OtpErlangPid)head.ElementAt(2);
Deliver(new OtpMsg(to, ibuf));
break;
case regSendTag: // { REG_SEND, FromPid, Cookie, ToName }
case regSendTTTag: // { REG_SEND, FromPid, Cookie, ToName, TraceToken }
if (!cookieOk)
{
// we only check this once, he can send us bad cookies later if he likes
if (!(head.ElementAt(2) is OtpErlangAtom))
{
continue;
}
cookie = (OtpErlangAtom)head.ElementAt(2);
if (sendCookie)
{
if (cookie.Value != Local.Cookie)
{
CookieError(Local, cookie);
}
}
else
{
if (cookie.Value != "")
{
CookieError(Local, cookie);
}
}
cookieOk = true;
}
if (TraceLevel >= TraceSend)
{
Logger.Debug($"<- {HeaderType(head)} {head}");
/* show received payload too */
ibuf.Mark();
Logger.Debug($" {ibuf.ReadAny()}");
ibuf.Reset();
}
from = (OtpErlangPid)head.ElementAt(1);
toName = (OtpErlangAtom)head.ElementAt(3);
Deliver(new OtpMsg(from, toName.Value, ibuf));
break;
case exitTag: // { EXIT, FromPid, ToPid, Reason }
case exit2Tag: // { EXIT2, FromPid, ToPid, Reason }
if (head.ElementAt(3) == null)
{
continue;
}
if (TraceLevel >= TraceCTRL)
{
Logger.Debug($"<- {HeaderType(head)} {head}");
}
from = (OtpErlangPid)head.ElementAt(1);
to = (OtpErlangPid)head.ElementAt(2);
reason = head.ElementAt(3);
Deliver(new OtpMsg(tag, from, to, reason));
break;
case exitTTTag: // { EXIT, FromPid, ToPid, TraceToken, Reason }
case exit2TTTag: // { EXIT2, FromPid, ToPid, TraceToken, Reason }
// as above, but bifferent element number
if (head.ElementAt(4) == null)
{
continue;
}
if (TraceLevel >= TraceCTRL)
{
Logger.Debug($"<- {HeaderType(head)} {head}");
}
from = (OtpErlangPid)head.ElementAt(1);
to = (OtpErlangPid)head.ElementAt(2);
reason = head.ElementAt(4);
Deliver(new OtpMsg(tag, from, to, reason));
break;
case linkTag: // { LINK, FromPid, ToPid}
case unlinkTag: // { UNLINK, FromPid, ToPid}
if (TraceLevel >= TraceCTRL)
{
Logger.Debug($"<- {HeaderType(head)} {head}");
}
from = (OtpErlangPid)head.ElementAt(1);
to = (OtpErlangPid)head.ElementAt(2);
Deliver(new OtpMsg(tag, from, to));
break;
// absolutely no idea what to do with these, so we ignore them...
case groupLeaderTag: // { GROUPLEADER, FromPid, ToPid}
// (just show trace)
if (TraceLevel >= TraceCTRL)
{
Logger.Debug("<- " + HeaderType(head) + " " + head);
}
break;
default:
// garbage?
break;
}
}
// this section reachable only with break
// we have received garbage from peer
Deliver(new OtpExit("Remote is sending garbage"));
}
catch (OtpAuthException e)
{
Deliver(e);
}
catch (OtpDecodeException)
{
Deliver(new OtpExit("Remote is sending garbage"));
}
catch (IOException)
{
Deliver(new OtpExit("Remote has closed connection"));
}
finally
{
Close();
}
}
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);
}