protected void recvChallengeAck(int our_challenge)
{
byte[] her_digest = new byte[16];
try
{
byte[] buf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(buf, 0);
int tag = ibuf.read1();
if (tag != ChallengeAck)
{
throw new IOException("Handshake protocol error");
}
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");
}
catch (Exception)
{
throw new OtpAuthException("Peer authentication error.");
}
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE recvChallengeAck" + " from="
+ peer.Node + " digest=" + hex(her_digest) + " local=" + self);
}
}
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 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;
}
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);
}
}
protected void recvStatus()
{
try
{
byte[] buf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(buf, 0);
int tag = ibuf.read1();
if (tag != ChallengeStatus)
{
throw new IOException("Handshake protocol error");
}
byte[] tmpbuf = new byte[buf.Length - 1];
ibuf.readN(tmpbuf);
String status = OtpErlangString.newString(tmpbuf);
if (status.CompareTo("ok") != 0)
{
throw new IOException("Peer replied with status '" + status + "' instead of 'ok'");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE recvStatus (ok)" + " local=" + self);
}
}
/*
* this function will get an exception if it tries to talk to an r3 epmd, or
* if something else happens that it cannot forsee. In both cases we return
* an exception (and the caller should try again, using the r3 protocol). If
* we manage to successfully communicate with an r4 epmd, we return either
* the socket, or null, depending on the result.
*/
private static TcpClient r4_publish(OtpLocalNode node)
{
TcpClient s = null;
try
{
OtpOutputStream obuf = new OtpOutputStream();
s = new TcpClient(node.Host, EpmdPort.get());
obuf.write2BE(node.Alive.Length + 13);
obuf.write1(publish4req);
obuf.write2BE(node.Port);
obuf.write1(node.Type);
obuf.write1(node.Proto);
obuf.write2BE(node.DistHigh);
obuf.write2BE(node.DistLow);
obuf.write2BE(node.Alive.Length);
obuf.writeN(Encoding.GetEncoding("iso-8859-1").GetBytes(node.Alive));
obuf.write2BE(0); // No extra
// send request
obuf.WriteTo(s.GetStream());
if (traceLevel >= traceThreshold)
{
log.Debug("-> PUBLISH (r4) " + node + " port=" + node.Port);
}
// get reply
byte[] tmpbuf = new byte[100];
int n = s.GetStream().Read(tmpbuf, 0, tmpbuf.Length);
if (n < 0)
{
// this was an r3 node => not a failure (yet)
if (s != null)
{
s.Close();
}
throw new IOException("Nameserver not responding on "
+ node.Host + " when publishing " + node.Alive);
}
OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
int response = ibuf.read1();
if (response == publish4resp)
{
int result = ibuf.read1();
if (result == 0)
{
node.Creation = ibuf.read2BE();
if (traceLevel >= traceThreshold)
{
log.Debug("<- OK");
}
return s; // success
}
}
}
catch (SocketException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Nameserver not responding on " + node.Host);
}
catch (IOException)
{
// epmd closed the connection = fail
if (s != null)
{
s.Close();
}
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Nameserver not responding on " + node.Host
+ " when publishing " + node.Alive);
}
catch (OtpErlangDecodeException)
{
if (s != null)
{
s.Close();
}
if (traceLevel >= traceThreshold)
{
log.Debug("<- (invalid response)");
}
throw new IOException("Nameserver not responding on " + node.Host
+ " when publishing " + node.Alive);
}
if (s != null)
{
s.Close();
}
return null;
}
private static int r4_lookupPort(AbstractNode node)
{
int port = 0;
try
{
OtpOutputStream obuf = new OtpOutputStream();
using (TcpClient s = new TcpClient(node.Host, EpmdPort.get()))
{
// build and send epmd request
// length[2], tag[1], alivename[n] (length = n+1)
obuf.write2BE(node.Alive.Length + 1);
obuf.write1(port4req);
obuf.writeN(Encoding.GetEncoding("iso-8859-1").GetBytes(node.Alive));
// send request
obuf.WriteTo(s.GetStream());
if (traceLevel >= traceThreshold)
{
log.Debug("-> LOOKUP (r4) " + node);
}
// receive and decode reply
// resptag[1], result[1], port[2], ntype[1], proto[1],
// disthigh[2], distlow[2], nlen[2], alivename[n],
// elen[2], edata[m]
byte[] tmpbuf = new byte[100];
int n = s.GetStream().Read(tmpbuf, 0, tmpbuf.Length);
if (n < 0)
{
// this was an r3 node => not a failure (yet)
throw new IOException("Nameserver not responding on "
+ node.Host + " when looking up " + node.Alive);
}
OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
int response = ibuf.read1();
if (response == port4resp)
{
int result = ibuf.read1();
if (result == 0)
{
port = ibuf.read2BE();
node.Type = ibuf.read1();
node.Proto = ibuf.read1();
node.DistHigh = ibuf.read2BE();
node.DistLow = ibuf.read2BE();
// ignore rest of fields
}
}
}
}
catch (SocketException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Nameserver not responding on " + node.Host);
}
catch (IOException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Nameserver not responding on " + node.Host
+ " when looking up " + node.Alive);
}
catch (OtpErlangDecodeException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (invalid response)");
}
throw new IOException("Nameserver not responding on " + node.Host
+ " when looking up " + node.Alive);
}
if (traceLevel >= traceThreshold)
{
if (port == 0)
{
log.Debug("<- NOT FOUND");
}
else
{
log.Debug("<- PORT " + port);
}
}
return port;
}
private static TcpClient r3_publish(OtpLocalNode node)
{
TcpClient s;
try
{
OtpOutputStream obuf = new OtpOutputStream();
s = new TcpClient(node.Host, EpmdPort.get());
obuf.write2BE(node.Alive.Length + 3);
obuf.write1(publish3req);
obuf.write2BE(node.Port);
obuf.writeN(Encoding.GetEncoding("iso-8859-1").GetBytes(node.Alive));
// send request
obuf.WriteTo(s.GetStream());
if (traceLevel >= traceThreshold)
{
log.Debug("-> PUBLISH (r3) " + node + " port=" + node.Port);
}
byte[] tmpbuf = new byte[100];
int n = s.GetStream().Read(tmpbuf, 0, tmpbuf.Length);
if (n < 0)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
return null;
}
OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
if (ibuf.read1() == publish3ok)
{
node.Creation = ibuf.read2BE();
if (traceLevel >= traceThreshold)
{
log.Debug("<- OK");
}
return s; // success - don't close socket
}
}
catch (SocketException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Nameserver not responding on " + node.Host);
}
catch (IOException)
{
// epmd closed the connection = fail
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Nameserver not responding on " + node.Host
+ " when publishing " + node.Alive);
}
catch (OtpErlangDecodeException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (invalid response)");
}
throw new IOException("Nameserver not responding on " + node.Host
+ " when publishing " + node.Alive);
}
return null; // failure
}
private void r4_publish(TcpClient s, OtpInputStream ibuf)
{
try
{
int port = ibuf.read2BE();
int type = ibuf.read1();
int proto = ibuf.read1();
int distHigh = ibuf.read2BE();
int distLow = ibuf.read2BE();
int len = ibuf.read2BE();
byte[] alive = new byte[len];
ibuf.readN(alive);
int elen = ibuf.read2BE();
byte[] extra = new byte[elen];
ibuf.readN(extra);
String name = OtpErlangString.newString(alive);
OtpPublishedNode node = new OtpPublishedNode(name);
node.Type = type;
node.DistHigh = distHigh;
node.DistLow = distLow;
node.Proto = proto;
node.Port = port;
if (traceLevel >= traceThreshold)
{
log.Debug("<- PUBLISH (r4) " + name + " port=" + node.Port);
}
OtpOutputStream obuf = new OtpOutputStream();
obuf.write1(publish4resp);
obuf.write1(0);
obuf.write2BE(epmd.Creation);
obuf.WriteTo(s.GetStream());
lock (portmap)
{
portmap.Add(name, node);
}
publishedPort.Add(name);
}
catch (IOException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Request not responding");
}
return;
}
public override void run()
{
byte[] lbuf = new byte[2];
OtpInputStream ibuf;
int len;
try
{
while (!done)
{
readSock(sock, lbuf);
ibuf = new OtpInputStream(lbuf, 0);
len = ibuf.read2BE();
byte[] tmpbuf = new byte[len];
readSock(sock, tmpbuf);
ibuf = new OtpInputStream(tmpbuf, 0);
int request = ibuf.read1();
switch (request)
{
case publish4req:
r4_publish(sock, ibuf);
break;
case port4req:
r4_port(sock, ibuf);
done = true;
break;
case names4req:
r4_names(sock, ibuf);
done = true;
break;
case stopReq:
break;
default:
log.InfoFormat("[OtpEpmd] Unknown request (request={0}, length={1}) from {2}",
request, len, sock.Client.RemoteEndPoint);
break;
}
}
}
catch (IOException)
{
}
finally
{
quit();
}
}
