openssh bugs - Oct 2005 - [Bug 1101] terminal allocation hangs ssh at a blocking tcsetattr (-t option)

http://bugzilla.mindrot.org/show_bug.cgi?id=1101

           Summary: terminal allocation hangs ssh at a blocking tcsetattr (-
                    t option)
           Product: Portable OpenSSH
           Version: 4.2p1
          Platform: ix86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: bitbucket at mindrot.org
        ReportedBy: imre.deak at nokia.com


I'm trying to use ppp over ssh as follows:

# pppd passive pty "ssh -qtt remote.mine.nu pppd
192.168.10.1:192.168.10.2"

The ssh process which is run as a child will try as a consequence of option -t
will hang for ever in function enter_raw_mode / tcsetattr(fileno(stdin),
TCSADRAIN, &tio) .

I could avoid the problem with replacing TCSADRAIN with TCSANOW, not sure
though what a proper fix would be for this.




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http://bugzilla.mindrot.org/show_bug.cgi?id=1101





------- Comment #1 from djm at mindrot.org  2005-10-12 22:39 -------
I'm not sure I understand: does it hang because pppd is filling the pty
buffer
so it never drains?




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------- Comment #2 from imre.deak at nokia.com  2005-10-14 15:52 -------
Well I'm not sure, why it hangs at this point, but even if it is as you
say filled by the local pppd there won't be anyone reading it on the other
side, since the remote pppd is not yet started. So it's a dead-lock
situation
in that case.

Let me know if you need any other info, or want me to perform some test.




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