Hi,
On Tue, Aug 14, 2012 at 09:47:36PM +0200, Gert Doering wrote:
> I can see two options how to solve this:
>
> 1 - set a flag if a device has been opened using a dynamic number
> ("--dev tap", which hunts for the first-free tapN device), and
> if yes, destroy the device on tun_close().
>
> This would leave devices lingering around if you call openvpn with
> "--dev tap3" and there has not been a "tap3" before - but this could
> be documented as "intended behaviour", and it would be fairly
> straightforward to implement.
>
> 2 - actually check for "--dev tap3" whether it exists before (by calling
> "ifconfig tap3" and checking the error return code - accessing /dev/tap3
> will not work, as that *always* springs the device to life), and
> destroy devices that we newly created, while leaving alone devices that
> have been there before.
>
> This will have the most nice user experience ("always leave the system
> as it was before"), but the implementation would mess up tun.c somewhat
> more.
3 - check for the existance of "--dev tap3" and remember, not cleaning
if it existed previously, doing this with RT_NETLINK which should
be sufficiently portable across all BSDs. Same advantage as "2",
hopefully much nicer implementation.
I'll see whether I can get "3" done in sufficiently nice code...
gert
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