[SOLVED] openvpn, dhcp, suspend and hooks

[hujuice]

My openvpn crashes when resuming from the hibernation.
The reason is quite clear: the physical network is inactive because of the DHCP.
Both elogind and dhcpcd have hooks to handle the problem, but the solution I have found is quite "spaghetti".

dhcpcd is not aware of suspend, so the only way is to use a pre-suspend elogind hook.
On the other side, elogind is not aware of the dhcpcd procedure after resume (lost carrier, rebinding, bla bla), so the only way is a post-binding dhcpcd hook.

The two hooks work, but I find a bit strange to manage two complementary operations with different tools.
Better ideas?

Code: Select all

#!/bin/bash
# -- Stop openvpn before suspend
#
# NOTE: openvpn is stopped here, before suspend, but NOT
#       restarted here, because a bounded dhcp address is
#       necessary. A dhcp hook is used for that.
#       See: /etc/dhcpcd.exit-hook

case $1/$2 in
  pre/*)
    /usr/bin/logger -p daemon.info "Stopping openvpn.home before suspend."
    /etc/init.d/openvpn.home stop
    ;;
esac

Code: Select all

# -- Start openvpn after suspend
#
# NOTE: the runlevel is restored here, but openvpn has been
#       stopped with an elogind hook.
#       See: /etc/elogind/system-sleep/stop-openvpn-before-suspend

if [ "${interface}" = "eth0" ]; then
    if [ "${reason}" = "BOUND" ]; then
        /usr/bin/logger -p daemon.info "Restoring runlevel after bound."
        /usr/bin/openrc
    fi
fi

Regards,
HUjuice

[szatox]

I used to have an acpid hook that would restart my wifi after suspend. It was basically a crash recovery action.
It didn't even matter whether it was triggered by suspend event or resume event, because a suspended machine doesn't do anything useful anyway, so the restart would be relayed until after resume.

[hujuice]

The solution is quite simple: manage the appropriate rc dependencies and stop the network before suspend.
openrc will do the job.

Code: Select all

rc_need="net.eth0"

Code: Select all

#!/bin/bash
# Stop the network to avoid openpvn crashes

NET="net.eth0"

case $1 in
    pre)
        if /etc/init.d/"${NET}" status; then
            /usr/bin/logger -p daemon.info "Stopping network before suspend."
            /etc/init.d/"${NET}" stop
        fi
        ;;
    post)
        /usr/bin/logger -p daemon.info "Restoring runlevel."
        /usr/bin/openrc
        ;;
esac