[maemo-developers] auto-start openvpn and udhcpc

[From: Marius Gedminas]

On Tue, Mar 02, 2010 at 10:25:48PM -0500, Jason wrote:
> I'm attempting to get openvpn on my N900 connecting to my existing
> openvpn server.  The openvpn part works well.  The automation part is
> trickier :-)
> 
> First, how do I get openvpn to automagically start anytime I select a
> network to connect to?  I'd like mail checks (which should pull up an
> interface on demand) to find my mailserver, which is only available
> via vpn.

Good question.  I suppose you already tried /etc/network/if-up.d/ and
it didn't work?

> Second, I've found a script workaround for the gprs0 unnamed gateway
> issue, but I can't figure out the proper way to trigger udhcpc on my
> tap0.  I've setup my openvpn infrastructure to use my dnsmasq server
> for dhcp and to use real dhcp clients to configure tap0 (one tool for
> one job [1]).  This has worked great for years on
> desktop/laptop/embedded platforms.  
> 
> I tried adding tap0 to /etc/network/interfaces, but that earned me a
> dumb look.  Isn't maemo supposed to be debian-based?

It is; that doesn't mean nothing was changed.

> I cat'd the
> /proc/$PID/cmdline of udhcpc for my wlan0 which sent me on a script
> hunt and didn't yield, at least to me, a clean way to hook in or
> trigger it.

Worst case you can listen for DBUS notifications to discover when the
N900 gets online.

Best case -- I hope you can find a script you can hook into.  E.g.
/etc/udhcpc/default.script might work.

> I also found that resolv.conf is changed in /var/run...

That's normal for dnsmasq, as far as I understand.
Incidentally, the script that modifies it is /etc/udhcpc/default.bound
or default.renew

> Any ideas?
> 
> thx,
> 
> Jason.
> 
> [1] http://www.faqs.org/docs/artu/ch01s06.html

Regards,
Marius Gedminas
-- 
C is a language that combines all the elegance and power of assembly language
with all the readability and maintainability of assembly language.
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