private void threadSpinCore()
{
if (!m_Connected)
{
Deliver(new ErlConnectionException(Name, StringConsts.ERL_CONN_NOT_CONNECTED_ERROR));
return;
}
int len;
byte[] header = new byte[4];
byte[] tock = new byte[] { 0, 0, 0, 0 };
byte[] payloadBuf = new byte[1024 * 1024];
try
{
while (m_Home.Running && !this.DisposeStarted && !m_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);
int n;
if ((n = ReadSock(header, header.Length, false)) < header.Length)
throw new ErlException(StringConsts.ERL_CONN_READ_TOO_SHORT_ERROR, n, header.Length);
len = header.ReadBEInt32();
// received tick? send tock!
if (len == 0)
lock (this)
{
if (m_Transport != null)
(m_Transport.GetStream()).Write(tock, 0, tock.Length);
}
}
while (len == 0); // tick_loop
if (len > DEFAULT_MAX_PAYLOAD_LENGTH)
throw new ErlException(
StringConsts.ERL_CONN_MSG_SIZE_TOO_LONG_ERROR, DEFAULT_MAX_PAYLOAD_LENGTH, len);
// got a real message (maybe) - read len bytes
byte[] tmpbuf = new byte[len]; // len > payloadBuf.Length ? new byte[len] : payloadBuf;
// i = socket.getInputStream().read(tmpbuf);
int m = ReadSock(tmpbuf, len, true);
if (m != len)
throw new ErlException(StringConsts.ERL_CONN_READ_TOO_SHORT_ERROR, m, len);
var ibuf = new ErlInputStream(tmpbuf, 0, len, checkVersion: false);
if (ibuf.Read1() != PASS_THROUGH)
goto receive_loop_brk;
try
{
// decode the header
var tmp = ibuf.Read(true);
if (!(tmp is ErlTuple))
goto receive_loop_brk;
var head = (ErlTuple)tmp;
if (!(head[0] is ErlByte))
goto receive_loop_brk;
// lets see what kind of message this is
ErlMsg.Tag tag = (ErlMsg.Tag)head[0].ValueAsInt;
switch (tag)
{
case ErlMsg.Tag.Send:
case ErlMsg.Tag.SendTT:
{
// { SEND, Cookie, ToPid, TraceToken }
if (!m_CookieOk)
{
// we only check this once, he can send us bad cookies later if he likes
if (!(head[1] is ErlAtom))
goto receive_loop_brk;
var cookie = (ErlAtom)head[1];
if (m_ShouldSendCookie)
{
if (!cookie.Equals(m_Cookie))
cookieError(m_Home, cookie);
}
else if (!cookie.Empty)
cookieError(m_Home, cookie);
m_CookieOk = true;
}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
{
long mark = ibuf.Position;
var traceobj = ibuf.Read(true);
ibuf.Position = mark;
return "{0} {1} trace: {2}".Args(
HeaderType(head), head.ToString(),
traceobj == null ? "(null)" : traceobj.ToString());
});
var to = (ErlPid)head[2];
Deliver(new ErlMsg(tag, ErlPid.Null, to, paybuf: ibuf));
break;
}
case ErlMsg.Tag.RegSend:
case ErlMsg.Tag.RegSendTT:
{
// { REG_SEND, FromPid, Cookie, ToName, TraceToken }
if (!m_CookieOk)
{
// we only check this once, he can send us bad cookies later if he likes
if (!(head[2] is ErlAtom))
goto receive_loop_brk;
var cookie = (ErlAtom)head[2];
if (m_ShouldSendCookie)
{
if (!cookie.Equals(m_Cookie))
cookieError(m_Home, cookie);
}
else if (!cookie.Empty)
cookieError(m_Home, cookie);
m_CookieOk = true;
}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
{
long mark = ibuf.Position;
var traceobj = ibuf.Read(true);
ibuf.Position = mark;
return "{0} {1} trace: {2}".Args(
HeaderType(head), head.ToString(),
traceobj == null ? "(null)" : traceobj.ToString());
});
var from = (ErlPid)head[1];
var toName = (ErlAtom)head[3];
Deliver(new ErlMsg(tag, from, toName, paybuf: ibuf));
break;
}
case ErlMsg.Tag.Exit:
case ErlMsg.Tag.Exit2:
{
// { EXIT2, FromPid, ToPid, Reason }
if (!(head[3] is ErlAtom))
goto receive_loop_brk;
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
var reason = (ErlAtom)head[3];
Deliver(new ErlMsg(tag, from, to, reason: reason));
break;
}
case ErlMsg.Tag.ExitTT:
case ErlMsg.Tag.Exit2TT:
{
// { EXIT2, FromPid, ToPid, TraceToken, Reason }
// as above, but bifferent element number
if (!(head[4] is ErlAtom))
goto receive_loop_brk;
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
// TODO: print TraceToken
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
var trace = (ErlTrace)head[3];
var reason = (ErlAtom)head[4];
Deliver(new ErlMsg(tag, from, to, reason: reason, trace: trace));
break;
}
case ErlMsg.Tag.Link:
case ErlMsg.Tag.Unlink:
{
// {UNLINK, FromPid, ToPid}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
Deliver(new ErlMsg(tag, from, to));
break;
}
case ErlMsg.Tag.GroupLeader:
case ErlMsg.Tag.NodeLink:
{
// No idea what to do with these, so we ignore them...
// {GROUP_LEADER, FromPid, ToPid}, { NODELINK }
// (just show trace)
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
break;
}
case ErlMsg.Tag.MonitorP:
case ErlMsg.Tag.DemonitorP:
{
// {MONITOR_P, FromPid, ToProc, Ref}
// {DEMONITOR_P, FromPid, ToProc, Ref}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
var eref = (ErlRef)head[3];
Deliver(new ErlMsg(tag, from, to, eref));
break;
}
case ErlMsg.Tag.MonitorPexit:
{
// {MONITOR_P_EXIT, FromPid, ToProc, Ref, Reason}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
var eref = (ErlRef)head[3];
var reason = head[4];
Deliver(ErlMsg.MonitorPexit(from, to, eref, reason));
break;
}
default:
// garbage?
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
StringConsts.ERL_CONN_UNKNOWN_TAG_ERROR.Args(
HeaderType(head), head.ToString()));
goto receive_loop_brk;
}
}
catch (Exception e)
{
// we have received garbage
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, e.ToString());
Deliver(new ErlBadDataException(
Name, /* "Remote has closed connection or sending garbage: " + */
e.Message));
}
}
receive_loop_brk:
// end receive_loop
// this section reachable only with break
// connection went down or we have received garbage from peer
Deliver(new ErlConnectionException(Name, StringConsts.ERL_CONN_INVALID_DATA_FROM_PEER_ERROR));
}
catch (ErlAuthException e)
{
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () => e.ToString());
Deliver(e);
}
catch (Exception e)
{
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () => e.ToString());
Deliver(new ErlConnectionException(
Name, /* "Remote has closed connection or sending garbage: " + */
e.Message));
}
finally
{
m_Thread = null;
Close();
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"Exiting connection (thread {0})".Args(Thread.CurrentThread.Name));
}
}
/// <summary>
/// Determine what port a node listens for incoming connections on
/// </summary>
/// <param name="home">Local node</param>
/// <param name="node">Remote lode for which to look up the port number from remote EPMD</param>
/// <param name="closeSocket">If true, close the connection to remote EPMD at return</param>
/// <returns>the listen port for the specified node, or 0 if the node
/// was not registered with Epmd</returns>
public static int LookupPort(ErlLocalNode home, ErlRemoteNode node,
bool closeSocket = false)
{
IErlTransport s = null;
try
{
var obuf = new ErlOutputStream(writeVersion: false, capacity: 4 + 3 + node.AliveName.Length + 1);
s = node.Epmd;
if (s == null)
{
//create transport
s = ErlTransportFactory.Create(node.TransportClassName, node.NodeName.Value);
s.Trace += (o, t, d, msg) => home.OnTrace(t, d, msg);
//append SSH params to transport
node.AppendSSHParamsToTransport(s);
//connect (I am not sure)
s.Connect(node.Host, EPMD_PORT, node.ConnectTimeout);
}
// build and send epmd request
// length[2], tag[1], alivename[n] (length = n+1)
obuf.Write2BE(node.AliveName.Length + 1);
obuf.Write1((byte)Indicator.Port4req);
//UPGRADE_NOTE: This code will be optimized in the future;
byte[] buf = Encoding.ASCII.GetBytes(node.AliveName);
obuf.Write(buf);
// send request
obuf.WriteTo(s.GetStream());
home.OnTrace(ErlTraceLevel.Epmd, Direction.Outbound,
StringConsts.ERL_EPMD_LOOKUP_R4.Args(node.NodeName.Value));
// 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]
buf = new byte[100];
int n = s.GetStream().Read(buf, 0, buf.Length);
if (n < 0)
throw new ErlException(StringConsts.ERL_EPMD_NOT_RESPONDING.Args(node.Host, node.AliveName));
var ibuf = new ErlInputStream(buf, 0, n, checkVersion: false);
if (Indicator.Port4resp == (Indicator)ibuf.Read1())
{
if (0 == ibuf.Read1())
{
node.Port = ibuf.Read2BE();
node.Ntype = (ErlAbstractNode.NodeType)ibuf.Read1();
node.Proto = ibuf.Read1();
node.DistHigh = ibuf.Read2BE();
node.DistLow = ibuf.Read2BE();
// ignore rest of fields
}
}
if (!closeSocket)
{
node.Epmd = s;
s = null;
}
}
catch (Exception e)
{
home.OnTrace(ErlTraceLevel.Epmd, Direction.Inbound, StringConsts.ERL_EPMD_INVALID_RESPONSE_ERROR.Args(node.Host, node.AliveName, e.ToString()));
throw new ErlException(StringConsts.ERL_EPMD_NOT_RESPONDING.Args(node.Host, node.AliveName, e.ToString()));
}
finally
{
if (s != null)
try { s.Close(); } catch { }
s = null;
}
home.OnTrace(ErlTraceLevel.Epmd, Direction.Inbound, () =>
node.Port == 0 ? StringConsts.ERL_EPMD_NOT_FOUND : StringConsts.ERL_EPMD_PORT.Args(node.Port));
return node.Port;
}
/// <summary>
/// Publish node's port at local EPMD, so that other nodes can connect to it.
///
/// On failure to connect to EPMD the function may throw if the value of
/// ErlApp.IgnoreLocalEpmdConnectErrors variable is true.
///
/// On failed connection attempt the function calls
/// node.OnEpmdFailedConnectAttempt delegate
/// </summary>
/// <remarks>
/// 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
/// </remarks>
public static bool PublishPort(ErlLocalNode node)
{
Exception error = null;
IErlTransport s = null;
try
{
ErlOutputStream obuf = new ErlOutputStream(writeVersion: false, capacity: node.AliveName.Length + 20);
s = node.Epmd ?? new ErlTcpTransport(ErlLocalNode.LocalHost, EPMD_PORT) { NodeName = node.NodeName.Value };
obuf.Write2BE(node.AliveName.Length + 13);
obuf.Write1((byte)Indicator.Publish4req);
obuf.Write2BE(node.Port);
obuf.Write1((byte)node.Ntype);
obuf.Write1((byte)node.Proto);
obuf.Write2BE(node.DistHigh);
obuf.Write2BE(node.DistLow);
obuf.Write2BE(node.AliveName.Length);
var buf = Encoding.ASCII.GetBytes(node.AliveName);
//UPGRADE_NOTE: This code will be optimized in the future;
obuf.Write(buf);
obuf.Write2BE(0); // No extra
// send request
obuf.WriteTo(s.GetStream());
node.OnTrace(ErlTraceLevel.Epmd, Direction.Outbound, () =>
StringConsts.ERL_EPMD_PUBLISH.Args(node.AliveName, node.Port, "r4"));
// get reply
buf = new byte[100];
int n = s.GetStream().Read(buf, 0, buf.Length);
if (n < 0)
// this was an r3 node => not a failure (yet)
throw new ErlException(StringConsts.ERL_EPMD_NOT_RESPONDING.Args(node.Host, node.AliveName));
ErlInputStream ibuf = new ErlInputStream(buf, 0, n, checkVersion: false);
if (Indicator.Publish4resp == (Indicator)ibuf.Read1())
{
int result = ibuf.Read1();
if (result == 0)
{
node.Creation = (byte)ibuf.Read2BE();
node.OnTrace(ErlTraceLevel.Epmd, Direction.Inbound, StringConsts.ERL_EPMD_OK);
node.Epmd = s;
return true; // success
}
}
error = new ErlException("Cannot register node '{0}' (not unique?)".Args(node.AliveName));
}
catch (Exception e)
{
error = e;
}
// epmd closed the connection = fail
if (s != null)
try { s.Close(); } catch { }
node.Epmd = null;
node.OnTrace(ErlTraceLevel.Epmd, Direction.Inbound, StringConsts.ERL_EPMD_NO_RESPONSE);
node.OnEpmdFailedConnectAttempt(node.NodeName, error.Message);
node.OnTrace(ErlTraceLevel.Epmd, Direction.Inbound, StringConsts.ERL_EPMD_FAILED_TO_CONNECT_ERROR);
if (!ErlApp.IgnoreLocalEpmdConnectErrors)
throw new ErlException(StringConsts.ERL_EPMD_FAILED_TO_CONNECT_ERROR + ": " + error.Message);
node.Creation = 0;
return false;
}
private void threadSpinCore()
{
if (!m_Connected)
{
Deliver(new ErlConnectionException(Name, StringConsts.ERL_CONN_NOT_CONNECTED_ERROR));
return;
}
int len;
byte[] header = new byte[4];
byte[] tock = new byte[] { 0, 0, 0, 0 };
byte[] payloadBuf = new byte[1024 * 1024];
try
{
while (m_Home.Running && !this.DisposeStarted && !m_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);
int n;
if ((n = ReadSock(header, header.Length, false)) < header.Length)
{
throw new ErlException(StringConsts.ERL_CONN_READ_TOO_SHORT_ERROR, n, header.Length);
}
len = header.ReadBEInt32();
// received tick? send tock!
if (len == 0)
{
lock (this)
{
if (m_Transport != null)
{
(m_Transport.GetStream()).Write(tock, 0, tock.Length);
}
}
}
}while (len == 0); // tick_loop
if (len > DEFAULT_MAX_PAYLOAD_LENGTH)
{
throw new ErlException(
StringConsts.ERL_CONN_MSG_SIZE_TOO_LONG_ERROR, DEFAULT_MAX_PAYLOAD_LENGTH, len);
}
// got a real message (maybe) - read len bytes
byte[] tmpbuf = new byte[len]; // len > payloadBuf.Length ? new byte[len] : payloadBuf;
// i = socket.getInputStream().read(tmpbuf);
int m = ReadSock(tmpbuf, len, true);
if (m != len)
{
throw new ErlException(StringConsts.ERL_CONN_READ_TOO_SHORT_ERROR, m, len);
}
var ibuf = new ErlInputStream(tmpbuf, 0, len, checkVersion: false);
if (ibuf.Read1() != PASS_THROUGH)
{
goto receive_loop_brk;
}
try
{
// decode the header
var tmp = ibuf.Read(true);
if (!(tmp is ErlTuple))
{
goto receive_loop_brk;
}
var head = (ErlTuple)tmp;
if (!(head[0] is ErlByte))
{
goto receive_loop_brk;
}
// lets see what kind of message this is
ErlMsg.Tag tag = (ErlMsg.Tag)head[0].ValueAsInt;
switch (tag)
{
case ErlMsg.Tag.Send:
case ErlMsg.Tag.SendTT:
{
// { SEND, Cookie, ToPid, TraceToken }
if (!m_CookieOk)
{
// we only check this once, he can send us bad cookies later if he likes
if (!(head[1] is ErlAtom))
{
goto receive_loop_brk;
}
var cookie = (ErlAtom)head[1];
if (m_ShouldSendCookie)
{
if (!cookie.Equals(m_Cookie))
{
cookieError(m_Home, cookie);
}
}
else if (!cookie.Empty)
{
cookieError(m_Home, cookie);
}
m_CookieOk = true;
}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
{
long mark = ibuf.Position;
var traceobj = ibuf.Read(true);
ibuf.Position = mark;
return("{0} {1} trace: {2}".Args(
HeaderType(head), head.ToString(),
traceobj == null ? "(null)" : traceobj.ToString()));
});
var to = (ErlPid)head[2];
Deliver(new ErlMsg(tag, ErlPid.Null, to, paybuf: ibuf));
break;
}
case ErlMsg.Tag.RegSend:
case ErlMsg.Tag.RegSendTT:
{
// { REG_SEND, FromPid, Cookie, ToName, TraceToken }
if (!m_CookieOk)
{
// we only check this once, he can send us bad cookies later if he likes
if (!(head[2] is ErlAtom))
{
goto receive_loop_brk;
}
var cookie = (ErlAtom)head[2];
if (m_ShouldSendCookie)
{
if (!cookie.Equals(m_Cookie))
{
cookieError(m_Home, cookie);
}
}
else if (!cookie.Empty)
{
cookieError(m_Home, cookie);
}
m_CookieOk = true;
}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
{
long mark = ibuf.Position;
var traceobj = ibuf.Read(true);
ibuf.Position = mark;
return("{0} {1} trace: {2}".Args(
HeaderType(head), head.ToString(),
traceobj == null ? "(null)" : traceobj.ToString()));
});
var from = (ErlPid)head[1];
var toName = (ErlAtom)head[3];
Deliver(new ErlMsg(tag, from, toName, paybuf: ibuf));
break;
}
case ErlMsg.Tag.Exit:
case ErlMsg.Tag.Exit2:
{
// { EXIT2, FromPid, ToPid, Reason }
if (!(head[3] is ErlAtom))
{
goto receive_loop_brk;
}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
var reason = (ErlAtom)head[3];
Deliver(new ErlMsg(tag, from, to, reason: reason));
break;
}
case ErlMsg.Tag.ExitTT:
case ErlMsg.Tag.Exit2TT:
{
// { EXIT2, FromPid, ToPid, TraceToken, Reason }
// as above, but bifferent element number
if (!(head[4] is ErlAtom))
{
goto receive_loop_brk;
}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
// TODO: print TraceToken
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
var trace = (ErlTrace)head[3];
var reason = (ErlAtom)head[4];
Deliver(new ErlMsg(tag, from, to, reason: reason, trace: trace));
break;
}
case ErlMsg.Tag.Link:
case ErlMsg.Tag.Unlink:
{
// {UNLINK, FromPid, ToPid}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
Deliver(new ErlMsg(tag, from, to));
break;
}
case ErlMsg.Tag.GroupLeader:
case ErlMsg.Tag.NodeLink:
{
// No idea what to do with these, so we ignore them...
// {GROUP_LEADER, FromPid, ToPid}, { NODELINK }
// (just show trace)
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
break;
}
case ErlMsg.Tag.MonitorP:
case ErlMsg.Tag.DemonitorP:
{
// {MONITOR_P, FromPid, ToProc, Ref}
// {DEMONITOR_P, FromPid, ToProc, Ref}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
var eref = (ErlRef)head[3];
Deliver(new ErlMsg(tag, from, to, eref));
break;
}
case ErlMsg.Tag.MonitorPexit:
{
// {MONITOR_P_EXIT, FromPid, ToProc, Ref, Reason}
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"{0} {1}".Args(HeaderType(head), head.ToString()));
var from = (ErlPid)head[1];
var to = (ErlPid)head[2];
var eref = (ErlRef)head[3];
var reason = head[4];
Deliver(ErlMsg.MonitorPexit(from, to, eref, reason));
break;
}
default:
// garbage?
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
StringConsts.ERL_CONN_UNKNOWN_TAG_ERROR.Args(
HeaderType(head), head.ToString()));
goto receive_loop_brk;
}
}
catch (Exception e)
{
// we have received garbage
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, e.ToString());
Deliver(new ErlBadDataException(
Name, /* "Remote has closed connection or sending garbage: " + */
e.Message));
}
}
receive_loop_brk:
// end receive_loop
// this section reachable only with break
// connection went down or we have received garbage from peer
Deliver(new ErlConnectionException(Name, StringConsts.ERL_CONN_INVALID_DATA_FROM_PEER_ERROR));
}
catch (ErlAuthException e)
{
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () => e.ToString());
Deliver(e);
}
catch (Exception e)
{
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () => e.ToString());
Deliver(new ErlConnectionException(
Name, /* "Remote has closed connection or sending garbage: " + */
e.Message));
}
finally
{
m_Thread = null;
Close();
m_Home.OnTrace(ErlTraceLevel.Ctrl, Direction.Inbound, () =>
"Exiting connection (thread {0})".Args(Thread.CurrentThread.Name));
}
}
/// <summary>
/// Determine what port a node listens for incoming connections on
/// </summary>
/// <param name="home">Local node</param>
/// <param name="node">Remote lode for which to look up the port number from remote EPMD</param>
/// <param name="closeSocket">If true, close the connection to remote EPMD at return</param>
/// <returns>the listen port for the specified node, or 0 if the node
/// was not registered with Epmd</returns>
public static int LookupPort(ErlLocalNode home, ErlRemoteNode node,
bool closeSocket = false)
{
TcpClient s = null;
try
{
var obuf = new ErlOutputStream(
writeVersion: false, capacity: 4 + 3 + node.AliveName.Length + 1);
s = node.Epmd ?? new TcpClient(node.Host, EPMD_PORT);
// build and send epmd request
// length[2], tag[1], alivename[n] (length = n+1)
obuf.Write2BE(node.AliveName.Length + 1);
obuf.Write1((byte)Indicator.Port4req);
//UPGRADE_NOTE: This code will be optimized in the future;
byte[] buf = Encoding.ASCII.GetBytes(node.AliveName);
obuf.Write(buf);
// send request
obuf.WriteTo(s.GetStream());
home.Trace(ErlTraceLevel.Epmd, Direction.Outbound,
StringConsts.ERL_EPMD_LOOKUP_R4.Args(node.NodeName.Value));
// 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]
buf = new byte[100];
int n = s.GetStream().Read(buf, 0, buf.Length);
if (n < 0)
{
throw new ErlException(StringConsts.ERL_EPMD_NOT_RESPONDING.Args(node.Host, node.AliveName));
}
var ibuf = new ErlInputStream(buf, 0, n, checkVersion: false);
if (Indicator.Port4resp == (Indicator)ibuf.Read1())
{
if (0 == ibuf.Read1())
{
node.Port = ibuf.Read2BE();
node.Ntype = (ErlAbstractNode.NodeType)ibuf.Read1();
node.Proto = ibuf.Read1();
node.DistHigh = ibuf.Read2BE();
node.DistLow = ibuf.Read2BE();
// ignore rest of fields
}
}
if (!closeSocket)
{
node.Epmd = s;
s = null;
}
}
catch (Exception)
{
home.Trace(ErlTraceLevel.Epmd, Direction.Inbound, StringConsts.ERL_EPMD_INVALID_RESPONSE_ERROR);
throw new ErlException(StringConsts.ERL_EPMD_NOT_RESPONDING.Args(node.Host, node.AliveName));
}
finally
{
if (s != null)
{
try { s.Close(); } catch {}
}
s = null;
}
home.Trace(ErlTraceLevel.Epmd, Direction.Inbound, () =>
node.Port == 0 ? StringConsts.ERL_EPMD_NOT_FOUND : StringConsts.ERL_EPMD_PORT.Args(node.Port));
return(node.Port);
}
/// <summary>
/// Publish node's port at local EPMD, so that other nodes can connect to it.
///
/// On failure to connect to EPMD the function may throw if the value of
/// ErlApp.IgnoreLocalEpmdConnectErrors variable is true.
///
/// On failed connection attempt the function calls
/// node.OnEpmdFailedConnectAttempt delegate
/// </summary>
/// <remarks>
/// 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
/// </remarks>
public static bool PublishPort(ErlLocalNode node)
{
Exception error = null;
TcpClient s = null;
try
{
ErlOutputStream obuf = new ErlOutputStream(
writeVersion: false, capacity: node.AliveName.Length + 20);
s = node.Epmd ?? new TcpClient(ErlLocalNode.LocalHost, EPMD_PORT);
obuf.Write2BE(node.AliveName.Length + 13);
obuf.Write1((byte)Indicator.Publish4req);
obuf.Write2BE(node.Port);
obuf.Write1((byte)node.Ntype);
obuf.Write1((byte)node.Proto);
obuf.Write2BE(node.DistHigh);
obuf.Write2BE(node.DistLow);
obuf.Write2BE(node.AliveName.Length);
var buf = Encoding.ASCII.GetBytes(node.AliveName);
//UPGRADE_NOTE: This code will be optimized in the future;
obuf.Write(buf);
obuf.Write2BE(0); // No extra
// send request
obuf.WriteTo(s.GetStream());
node.Trace(ErlTraceLevel.Epmd, Direction.Outbound, () =>
StringConsts.ERL_EPMD_PUBLISH.Args(node.AliveName, node.Port, "r4"));
// get reply
buf = new byte[100];
int n = s.GetStream().Read(buf, 0, buf.Length);
if (n < 0)
{
// this was an r3 node => not a failure (yet)
throw new ErlException(StringConsts.ERL_EPMD_NOT_RESPONDING.Args(node.Host, node.AliveName));
}
ErlInputStream ibuf = new ErlInputStream(buf, 0, n, checkVersion: false);
if (Indicator.Publish4resp == (Indicator)ibuf.Read1())
{
int result = ibuf.Read1();
if (result == 0)
{
node.Creation = (byte)ibuf.Read2BE();
node.Trace(ErlTraceLevel.Epmd, Direction.Inbound, StringConsts.ERL_EPMD_OK);
node.Epmd = s;
return(true); // success
}
}
error = new ErlException("Cannot register node '{0}' (not unique?)".Args(node.AliveName));
}
catch (Exception e)
{
error = e;
}
// epmd closed the connection = fail
if (s != null)
{
try { s.Close(); } catch {}
}
node.Epmd = null;
node.Trace(ErlTraceLevel.Epmd, Direction.Inbound, StringConsts.ERL_EPMD_NO_RESPONSE);
node.OnEpmdFailedConnectAttempt(node.NodeName, error.Message);
node.Trace(ErlTraceLevel.Epmd, Direction.Inbound, StringConsts.ERL_EPMD_FAILED_TO_CONNECT_ERROR);
if (!ErlApp.IgnoreLocalEpmdConnectErrors)
{
throw new ErlException(error.Message);
}
node.Creation = 0;
return(false);
}