[PATCH] LocalPreCommand: Support for executing command before ssh connection (like port knock before ssh)

[Bartłomiej Korupczynski]

2014-12-23 2:15 GMT+01:00 Damien Miller <djm at mindrot.org>:
> On Sun, 21 Dec 2014, Bart?omiej Korupczynski wrote:
>
>> Hi guys,
>>
>> I've made a patch adding LocalPreCommand to ssh_config. It mimics
>> behaviour of LocalCommand, but is executed right before the connection
>> is opened. This makes possible e.g. to integrate ssh with port
>> knocking. It also removes "-oPermitLocalCommand=no" from scp allowing
>
> This can be done using a shell script, shell alias, shell function or
> other wrapper without touching ssh.

Well, not exactly. When using ControlMaster, connection is setup once,
thus the LocalPreCommand is also called only once. Having mixed
ControlMaster for some hosts and not for others makes headache. Been
there, done that. Wrapping with functions/aliases make unnecessary
mess around, especially having many hosts with different setups. To be
really transparent, it would require parsing ssh command line to
search for host name.