protected int recvChallenge()
{
int challenge;
try
{
byte[] buf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(buf, 0);
peer.Type = ibuf.read1();
if (peer.Type != AbstractNode.NTYPE_R6)
{
throw new IOException("Unexpected peer type");
}
peer.DistLow = peer.DistHigh = ibuf.read2BE();
peer.Flags = ibuf.read4BE();
challenge = ibuf.read4BE();
byte[] tmpname = new byte[buf.Length - 11];
ibuf.readN(tmpname);
String hisname = OtpErlangString.newString(tmpname);
if (!hisname.Equals(peer.Node))
{
throw new IOException("Handshake failed - peer has wrong name: " + hisname);
}
if ((peer.Flags & AbstractNode.dFlagExtendedReferences) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended references");
}
if ((peer.Flags & AbstractNode.dFlagExtendedPidsPorts) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended pids and ports");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE recvChallenge" + " from="
+ peer.Node + " challenge=" + challenge + " local=" + self);
}
return challenge;
}
public override void run()
{
if (!connected)
{
deliver(new IOException("Not connected"));
return;
}
byte[] lbuf = new byte[4];
OtpInputStream ibuf;
OtpErlangObject traceobj;
int len;
byte[] tock = { 0, 0, 0, 0 };
try
{
receive_loop:
while (!done)
{
// 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!
do
{
// read 4 bytes - get length of incoming packet
// socket.getInputStream().read(lbuf);
readSock(socket, lbuf);
ibuf = new OtpInputStream(lbuf, flags);
len = ibuf.read4BE();
// received tick? send tock!
if (len == 0)
{
lock (this)
{
socket.GetOutputStream().Write(tock, 0, tock.Length);
socket.GetOutputStream().Flush();
}
}
} while (len == 0); // tick_loop
// got a real message (maybe) - read len bytes
byte[] tmpbuf = new byte[len];
// i = socket.getInputStream().read(tmpbuf);
readSock(socket, tmpbuf);
ibuf = new OtpInputStream(tmpbuf, flags);
if (ibuf.read1() != passThrough)
{
goto receive_loop;
}
// got a real message (really)
OtpErlangObject reason = null;
OtpErlangAtom cookie = null;
OtpErlangObject tmp = null;
OtpErlangTuple head = null;
OtpErlangAtom toName;
OtpErlangPid to;
OtpErlangPid from;
int tag;
// decode the header
tmp = ibuf.read_any();
if (!(tmp is OtpErlangTuple))
{
goto receive_loop;
}
head = (OtpErlangTuple)tmp;
if (!(head.elementAt(0) is OtpErlangLong))
{
goto receive_loop;
}
// 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))
{
goto receive_loop;
}
cookie = (OtpErlangAtom)head.elementAt(1);
if (sendCookie)
{
if (!cookie.atomValue().Equals(self.Cookie))
{
cookieError(self, cookie);
}
}
else
{
if (!cookie.atomValue().Equals(""))
{
cookieError(self, cookie);
}
}
cookieOk = true;
}
if (traceLevel >= sendThreshold)
{
log.Debug("<- " + headerType(head) + " " + head);
/* show received payload too */
ibuf.Mark(0);
traceobj = ibuf.read_any();
if (traceobj != null)
{
log.Debug(" " + traceobj);
}
else
{
log.Debug(" (null)");
}
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))
{
goto receive_loop;
}
cookie = (OtpErlangAtom)head.elementAt(2);
if (sendCookie)
{
if (!cookie.atomValue().Equals(self.Cookie))
{
cookieError(self, cookie);
}
}
else
{
if (!cookie.atomValue().Equals(""))
{
cookieError(self, cookie);
}
}
cookieOk = true;
}
if (traceLevel >= sendThreshold)
{
log.Debug("<- " + headerType(head) + " " + head);
/* show received payload too */
ibuf.Mark(0);
traceobj = ibuf.read_any();
if (traceobj != null)
{
log.Debug(" " + traceobj);
}
else
{
log.Debug(" (null)");
}
ibuf.Reset();
}
from = (OtpErlangPid)head.elementAt(1);
toName = (OtpErlangAtom)head.elementAt(3);
deliver(new OtpMsg(from, toName.atomValue(), ibuf));
break;
case exitTag: // { EXIT, FromPid, ToPid, Reason }
case exit2Tag: // { EXIT2, FromPid, ToPid, Reason }
if (head.elementAt(3) == null)
{
goto receive_loop;
}
if (traceLevel >= ctrlThreshold)
{
log.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)
{
goto receive_loop;
}
if (traceLevel >= ctrlThreshold)
{
log.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 >= ctrlThreshold)
{
log.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}
case nodeLinkTag: // { NODELINK }
// (just show trace)
if (traceLevel >= ctrlThreshold)
{
log.Debug("<- " + headerType(head) + " " + head);
}
break;
default:
// garbage?
goto receive_loop;
}
} // end receive_loop
// this section reachable only with break
// we have received garbage from peer
deliver(new OtpErlangExit("Remote is sending garbage"));
} // try
catch (OtpAuthException e)
{
deliver(e);
}
catch (OtpErlangDecodeException)
{
deliver(new OtpErlangExit("Remote is sending garbage"));
}
catch (IOException)
{
deliver(new OtpErlangExit("Remote has closed connection"));
}
finally
{
close();
}
}
protected int recvChallengeReply(int our_challenge)
{
int challenge;
byte[] her_digest = new byte[16];
try
{
byte[] buf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(buf, 0);
int tag = ibuf.read1();
if (tag != ChallengeReply)
{
throw new IOException("Handshake protocol error");
}
challenge = ibuf.read4BE();
ibuf.readN(her_digest);
byte[] our_digest = genDigest(our_challenge, self.Cookie);
if (!digests_equals(her_digest, our_digest))
{
throw new OtpAuthException("Peer authentication error.");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE recvChallengeReply"
+ " from=" + peer.Node + " challenge=" + challenge
+ " digest=" + hex(her_digest) + " local=" + self);
}
return challenge;
}
protected void recvName(OtpPeer peer)
{
String hisname = "";
try
{
byte[] tmpbuf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
byte[] tmpname;
int len = tmpbuf.Length;
peer.Type = ibuf.read1();
if (peer.Type != AbstractNode.NTYPE_R6)
{
throw new IOException("Unknown remote node type");
}
peer.DistLow = peer.DistHigh = ibuf.read2BE();
if (peer.DistLow < 5)
{
throw new IOException("Unknown remote node type");
}
peer.Flags = ibuf.read4BE();
tmpname = new byte[len - 7];
ibuf.readN(tmpname);
hisname = OtpErlangString.newString(tmpname);
// Set the old nodetype parameter to indicate hidden/normal status
// When the old handshake is removed, the ntype should also be.
if ((peer.Flags & AbstractNode.dFlagPublished) != 0)
{
peer.Type = AbstractNode.NTYPE_R4_ERLANG;
}
else
{
peer.Type = AbstractNode.NTYPE_R4_HIDDEN;
}
if ((peer.Flags & AbstractNode.dFlagExtendedReferences) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended references");
}
if ((peer.Flags & AbstractNode.dFlagExtendedPidsPorts) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended pids and ports");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
int i = hisname.IndexOf('@', 0);
peer.Node = hisname;
peer.Alive = hisname.Substring(0, i);
peer.Host = hisname.Substring(i + 1, hisname.Length - (i + 1));
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE" + " ntype=" + peer.Type
+ " dist=" + peer.DistHigh + " remote=" + peer);
}
}
public static String[] lookupNames(IPAddress address)
{
try
{
OtpOutputStream obuf = new OtpOutputStream();
using (TcpClient s = new TcpClient(address.ToString(), EpmdPort.get()))
{
obuf.write2BE(1);
obuf.write1(names4req);
// send request
obuf.WriteTo(s.GetStream());
if (traceLevel >= traceThreshold)
{
log.Debug("-> NAMES (r4) ");
}
// get reply
byte[] buffer = new byte[256];
MemoryStream ms = new MemoryStream(256);
while (true)
{
int bytesRead = s.GetStream().Read(buffer, 0, buffer.Length);
if (bytesRead == -1)
{
break;
}
ms.Write(buffer, 0, bytesRead);
}
byte[] tmpbuf = ms.GetBuffer();
OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
ibuf.read4BE(); // read port int
// int port = ibuf.read4BE();
// check if port = epmdPort
int n = tmpbuf.Length;
byte[] buf = new byte[n - 4];
Array.Copy(tmpbuf, 4, buf, 0, n - 4);
String all = OtpErlangString.newString(buf);
return all.Split(new char[] { '\n' });
}
}
catch (SocketException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Nameserver not responding on " + address);
}
catch (IOException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Nameserver not responding when requesting names");
}
catch (OtpErlangDecodeException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (invalid response)");
}
throw new IOException("Nameserver not responding when requesting names");
}
}
