Hotplug extras

• This instruction extends the functionality of Hotplug.
• Follow the automated section for quick setup.

• Run scripts at startup when the network is online.

• Rely on network functions to identify WAN interface.
• Use Hotplug to detect WAN connectivity and trigger network dependent scripts.
• Process subsystem-specific scripts with hotplug-call.
• Delay script invocation with sleep to work around tunneled connections.
• Write and read non-interactive logs with Syslog for troubleshooting.

# Configure hotplug
mkdir -p /etc/hotplug.d/iface
cat << "EOF" > /etc/hotplug.d/iface/90-online
. /lib/functions/network.sh
network_flush_cache
network_find_wan NET_IF
network_find_wan6 NET_IF6
if [ "${INTERFACE}" != "${NET_IF}" ] \
&& [ "${INTERFACE}" != "${NET_IF6}" ]
then exit 0
fi
if [ "${ACTION}" != "ifup" ] \
&& [ "${ACTION}" != "ifupdate" ]
then exit 0
fi
if [ "${ACTION}" = "ifupdate" ] \
&& [ -z "${IFUPDATE_ADDRESSES}" ] \
&& [ -z "${IFUPDATE_DATA}" ]
then exit 0
fi
hotplug-call online
EOF
cat << "EOF" >> /etc/sysupgrade.conf
/etc/hotplug.d/iface/90-online
EOF
mkdir -p /etc/hotplug.d/online
cat << "EOF" > /etc/hotplug.d/online/10-sleep
sleep 10
EOF
cat << "EOF" >> /etc/sysupgrade.conf
/etc/hotplug.d/online/10-sleep
EOF

# Example script
cat << "EOF" > /etc/hotplug.d/online/30-example
logger -t hotplug online
EOF
reboot

uclient-fetch -O hotplug-extras.sh "https://openwrt.org/_export/code/docs/guide-user/advanced/hotplug_extras?codeblock=0"
. ./hotplug-extras.sh