Date: Wed, 04 Jul 2001 04:47:58 +0100 From: Brian Somers <brian@Awfulhak.org> To: freebsd-mobile@FreeBSD.org Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org, Brian Somers <brian@Awfulhak.org> Subject: Wireless setup (was: cvs commit: src/usr.sbin/ppp main.c) Message-ID: <200107040347.f643lwc15969@hak.lan.Awfulhak.org> In-Reply-To: Message from Brian Somers <brian@FreeBSD.org> of "Tue, 03 Jul 2001 20:34:20 PDT." <200107040334.f643YKx49662@freefall.freebsd.org>
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For those interested in how my wireless gear is setup (now that
it's working):
At home, I have my wireless access point attached to my external
(dirty) network. When I attach my laptop, it obtains a (MAC-based)
IP number via dhcp from my gateway box. I have an
/etc/dhclient-exit-hooks script that says:
case "$reason" in
BOUND|REBOOT|RENEW)
if [ ."$new_ip_address" = .217.204.245.19 -a \
."$new_server_name" = .gw.Awfulhak.org ]
then
ps axopid,command | fgrep 'ppp -ddial hgw' | while read pid cmd
do
kill $pid
kill -2 $pid
done
ppp -ddial hgw
killall -0 nmbd 2>/dev/null ||
/usr/local/etc/rc.d/samba.sh start
fi;;
esac
The hgw profile runs an encrypted PPPoE session to my gateway box -
providing un-firewalled VPN access.
Because dhclient was executing this with closed stdin/stdout/stderr
descriptors in the RENEW case, ppp was erroneously opening /dev/tun0
as descriptor 0 and the daemonisation bit further on in main() happily
closed STDIN_FILENO, blowing away half of the tun device !
This bug has been irritating me for weeks !!!
> brian 2001/07/03 20:34:20 PDT
>
> Modified files:
> usr.sbin/ppp main.c
> Log:
> Handle any of descriptors 0, 1 or 2 being closed when we're
> envoked -- don't use them (as return values from open()), then
> (say) close(STDIN_FILENO) when daemonising.
>
> This is done by grabbing 3 descriptors to /dev/null at startup and
> releasing them after we've daemonised.
>
> MFC after: 1 week
>
> Revision Changes Path
> 1.181 +19 -2 src/usr.sbin/ppp/main.c
--
Brian <brian@freebsd-services.com> <brian@Awfulhak.org>
http://www.freebsd-services.com/ <brian@[uk.]FreeBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@[uk.]OpenBSD.org>
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