Hacking source: un-forward local port?

Dan Kaminsky dan at doxpara.com
Thu Feb 4 07:19:13 EST 2010

I'm something of a fan of -D and socksifying client apps. Better than  
littering local port namespace, anyway.

On Feb 3, 2010, at 2:12 PM, Konstantin Leonov <edk at caribbeanblue.ru>  

> Hello!
> I was looking around for a solution which would allow me to un-forward
> already locally forwarded port but had no luck.
> So I decided to try and add it myself.
> I am not a good C coder, in fact, I've never really coded under unix
> before(it's just half a year since I fully moved from windowz). Here
> is what I made by now:
> http://www.linuxquestions.org/questions/programming-9/c-coding-hacking-ssh-dynamic-local-port-forwarding-implementation-786608/
> By querying ~C and "-KL<port>" now it is possible to remove local
> listener and later, reuse it to forward to another destination.
> I didn't test it with specifying bind address, and I guess that will
> probably fail anyways since I've only one input param in newly created
> function.
> If this hack can be of any help and developed further, to be added in
> OpenSSH later: that would be great! In fact I just had nothing to do
> and some guy on forum posted that question about impossibility of
> removing local port forward in openssh so I took some time and tried
> to hack sources to implement that myself, just my curiosity.
> Maybe if I'll wish, I'll get back to this later and see if I can
> improve it and make it not as ugly hack as it is now :)
> Anyway, can someone explain me why such an easy thingy has not been
> fully implemented recently? Noone ever asked? Noone ever thought? Or
> it was me who searched not good enough? Anyways it is neither in
> stable nor in SVN releases. Dynamic un-forwarding works great in
> PuTTY, for instance.
> Konstantin.
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