Perhaps this approaches what you're trying to do:

http://code.google.com/p/ssh-fwknop/

On 07/22/2009 22:21 +0530, J. Bakshi wrote:
>> On Wed, 22 Jul 2009 01:27:14 -0430
>> Aar__n Mizrachi <unmanarc (at) gmail (dot) com [email concealed]> wrote:
>>
>> > On Martes 21 Julio 2009 12:29:44 J. Bakshi escribi__:
>> > > Hello list,
>> > >
>> > > I have openssh-client __1:5.1p1-5+b1 installed in my debian box. I
>> > > have remote ssh information stored in my .ssh/config file. I have
>> > > protected one remote ssh by fwknop. When I need ssh login to that
>> > > particular sever I have to open the port with fwknop client
>> > > installed in my local box. Is there any option in sshclient so that
>> > > It can execute a local command ( here the fwknop obviously ) before
>> > > doing ssh to that remote server ?
>> > >
>> > > Thanks
>> >
>> > You can do something like that defining some alias on /etc/bashrc
>> >
>> > alias ssh="function dossh { fwknop -A \"tcp/22\" -s -D
>> > \$1; /usr/bin/ssh -l myuser \$1; }; dossh "
>> >
>> > Then: ssh myhost
>> >
>> > Moreover... for more complex expresion... you can add the user
>> > parameter as $2, add if's if you want, or even use the $@ and extract
>> > the hostname from the parameters to use it on fwknop and use the rest
>> > of the argument on -A and ssh command.
>> >
>> >
>>
>> well, using the alias is a brilliant idea, but I have multiple hosts and they have different fwknop encryption password. That's why I stored all the server info at .ssh/config file. It would be helpful if ssh can execute local command for individual host prior to its connection attempt.
End of included message

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