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;
}
/*
* 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 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 static int r3_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(port3req);
obuf.writeN(Encoding.GetEncoding("iso-8859-1").GetBytes(node.Alive));
// send request
obuf.WriteTo(s.GetStream());
if (traceLevel >= traceThreshold)
{
log.Debug("-> LOOKUP (r3) " + node);
}
// receive and decode reply
byte[] tmpbuf = new byte[100];
s.GetStream().Read(tmpbuf, 0, tmpbuf.Length);
OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
port = ibuf.read2BE();
}
}
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;
}
// Ask epmd to close his end of the connection.
// Caller should close his epmd socket as well.
// This method is pretty forgiving...
/**
* Unregister from Epmd. Other nodes wishing to connect will no longer be
* able to.
*
* <p>
* This method does not report any failures.
*/
public static void unPublishPort(OtpLocalNode node)
{
try
{
using (TcpClient s = new TcpClient(Dns.GetHostName(), EpmdPort.get()))
{
OtpOutputStream obuf = new OtpOutputStream();
obuf.write2BE(node.Alive.Length + 1);
obuf.write1(stopReq);
obuf.writeN(Encoding.GetEncoding("iso-8859-1").GetBytes(node.Alive));
obuf.WriteTo(s.GetStream());
// don't even wait for a response (is there one?)
if (traceLevel >= traceThreshold)
{
log.Debug("-> UNPUBLISH " + node + " port=" + node.Port);
log.Debug("<- OK (assumed)");
}
}
}
catch (Exception) /* ignore all failures */
{
}
}
private void r4_port(TcpClient s, OtpInputStream ibuf)
{
try
{
int len = (int)(ibuf.Length - 1);
byte[] alive = new byte[len];
ibuf.readN(alive);
String name = OtpErlangString.newString(alive);
OtpPublishedNode node = null;
if (traceLevel >= traceThreshold)
{
log.Debug("<- PORT (r4) " + name);
}
lock (portmap)
{
if (portmap.ContainsKey(name))
{
node = portmap[name];
}
}
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);
}
else
{
obuf.write1(port4resp);
obuf.write1(1);
}
obuf.WriteTo(s.GetStream());
}
catch (IOException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Request not responding");
}
return;
}
private void r4_names(TcpClient s, OtpInputStream ibuf)
{
try
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- NAMES(r4) ");
}
OtpOutputStream obuf = new OtpOutputStream();
obuf.write4BE(EpmdPort.get());
lock (portmap)
{
foreach (KeyValuePair<string, OtpPublishedNode> pair in portmap)
{
OtpPublishedNode node = pair.Value;
string info = String.Format("name {0} at port {1}\n", node.Alive, node.Port);
byte[] bytes = Encoding.GetEncoding("iso-8859-1").GetBytes(info);
obuf.writeN(bytes);
}
}
obuf.WriteTo(s.GetStream());
}
catch (IOException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Request not responding");
}
return;
}
