openssh bugs - Jan 2007 - [Bug 1278] CYGWIN controlMaster connections don't work.

http://bugzilla.mindrot.org/show_bug.cgi?id=1278

           Summary: CYGWIN controlMaster connections don't work.
           Product: Portable OpenSSH
           Version: v4.5p1
          Platform: ix86
        OS/Version: Cygwin on NT/2k
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: bitbucket at mindrot.org
        ReportedBy: public.marvin at gmail.com


With this in my .ssh/config:
   ControlMaster auto
   ControlPath ~/.ssh/master-%r@%h-%p

I do (in one shell)
   ssh -Mnf REMOTE.HOST.NAME sleep 600
   <enter password>

In other shell
   ssh REMOTE.HOST.NAME

Master says:
mm_receive_fd: no message header 
 - - and exits
"Slave" says:
ssh_msg_recv: read: header
control_client: msg_recv
   - - and exits

Tried various permutations with -M, -S and nothing in config file,
yield
same result.




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------- Comment #1 from public.marvin at gmail.com  2007-01-30 03:15 -------
Created an attachment (id=1234)
 --> (http://bugzilla.mindrot.org/attachment.cgi?id=1234&action=view)
-v -v -v log of the initial master during failure

 ssh -Mnf -v  -v -v -S .ssh/foo REMOTE.HOST.NAME sleep 600 2> ssh.log

(hostnames and ips removed from log)




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------- Comment #2 from public.marvin at gmail.com  2007-01-30 03:17 -------
Created an attachment (id=1235)
 --> (http://bugzilla.mindrot.org/attachment.cgi?id=1235&action=view)
log of client connection during failure

ssh  -v -v -v -S .ssh/foo REMOTE.HOST.NAME 2> sshclient.log

(hostnames and ips removed)




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------- Comment #3 from dtucker at zip.com.au  2007-01-30 07:05 -------
ControlMaster works by passing a file descriptor between unrelated
processes via a Unix domain socket, and I don't think that's even
possible on Cygwin.  ssh should probably return a more specific error
message if that's the case. 




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------- Comment #4 from marvinpublic at comcast.net  2007-01-30 10:08 -------
I am not at all a cygwin expert, but it seems from googling that there
is support for unix domain sockets:  see
http://comments.gmane.org/gmane.os.cygwin/1046, for example.

I'll see if I can put together a python testcase demonstrating cygwin
unix domain sockets work.  Note that in the example I wsa running I did
see ssh -M creating "something" in the file system.  Here's what
happens when I do
ssh -M -S /tmp/foo3 some.hostname...

ls -l /tmp
srw------- 1 mgreenberg None 53 Jan 29 18:05 foo3




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------- Comment #5 from dtucker at zip.com.au  2007-01-30 10:55 -------
(In reply to comment #4)
> I am not at all a cygwin expert, but it seems from googling that there
> is support for unix domain sockets: [...]
It's not Unix domain sockets that's the problem but *descriptor passing
over Unix domain sockets*.

I found the reference I was thinking of from Corinna (who most
definitely is a Cygwin expert :-) here:
http://marc.theaimsgroup.com/?l=openssh-unix-dev&m=108357562706575

The fact that Cygwin in general works as well as it does makes it easy
to forget that the underlying OS is actually quite difference.




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------- Comment #6 from marvinpublic at comcast.net  2007-01-30 13:32 -------
so sad.  I was really looking forward to this feature...




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