Package: openssh-client
Version: 1:5.1p1-5
Three ssh client features, that work individually, fail in combination.
1) -f, to fork and exit after initial connection
2) -R, to bind remote ports and forward to the local network
3) -o ExitOnForwardFailure=yes, to immediately indicate failure of -L or -R
Unfortunately, -f causes the session to fork-and-exit before the
forwarding happens. So even if it does fail, we get an exit status 0
instead of 255.
It works without -f:
$ ssh -oExitOnForwardFailure=yes -R1024:localhost:1 some_host 'true' ||
echo 'FAILED'
$ ssh -oExitOnForwardFailure=yes -R1023:localhost:1 some_host 'true' ||
echo 'FAILED'
Error: remote port forwarding failed for listen port 1023
FAILED
But with -f, doesn't seem to fail until after the fork:
$ ssh -f -oExitOnForwardFailure=yes -R1024:localhost:1 some_host 'true' ||
echo 'FAILED'
$ ssh -f -oExitOnForwardFailure=yes -R1023:localhost:1 some_host 'true' ||
echo 'FAILED'
$ Error: remote port forwarding failed for listen port 1023
Interestingly, it works with protocol 1 - possibly because it just ignores the
-f...
$ ssh -f -1 -oExitOnForwardFailure=yes -R1024:localhost:1 some_host 'true'
|| echo 'FAILED'
$ ssh -f -1 -oExitOnForwardFailure=yes -R1023:localhost:1 some_host 'true'
|| echo 'FAILED'
Received disconnect from 172.17.99.20: Requested forwarding of port 1023
but user is not root.
FAILED
This is almost certainly client side, but FYI, the server is also on 1:5.1p1-5.
--
Peter Samuelson | org-tld!p12n!peter | http://p12n.org/
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