SSHv2 sshd exit criteria

[Nicolas Williams]

When should sshd disconnect an SSHv2 connection?

Markus Friedl says "for protocol v2 the client decides when to close the
connection."

In principle, I agree, because SSHv2 supports multiple sessions over the
same connection, with the client able to launch new sessions anytime
then it should be upto the client.

But this would be a major cultural change for most users, and would
break any useage of SSHv2 for batch purposes.

So perhaps the sshd exit criteria ought to be defined.

I propose that, if the client never started any session other than the
default session, and if the session ended, and there are no more open
channels, then sshd should exit. But, if the client did open more than
one session, then sshd should not exit, even if there are no more
sessions in use and no more open channels. Fatal errors aside.

Nico
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