NetwokManager HE-dDNS hook

ddns

#!/bin/sh
#/etc/NetworkManager/dispatcher.d/ddns

arg1=$1
arg2=$2
DUMPS="/tmp/my Dispatch"
IF=enp5s0
name=host1.example.net
. /home/mz0/.ssh/ddns-key  # key=6KigGftdvYqEvTW

update() {
  updateURL="https://dyn.dns.he.net/nic/update?hostname=${name}&password=${key}&myip=${1}"
  curl -s -o /tmp/ddns-update.re -X GET $updateURL
  cat /tmp/ddns-update.re >> $2  # TODO log file timestamp
  echo >> ${2}
}

dumpvars() {
  echo "arg1=$arg1" >> ${1}
  echo "arg2=$arg2" >> ${1}
  /usr/bin/env  >> "$1"
}

echo '=========================================' >> $DUMPS
echo "$0 log"    >> $DUMPS
echo -n "start " >> $DUMPS
date >> $DUMPS

dumpvars "$DUMPS"

if [ $DEVICE_IFACE = $IF ] && [ -n $DHCP4_IP_ADDRESS ] \
   && [ NM_DISPATCHER_ACTION != dhcp6-change ]
then
  # takes ca. 2 seconds; TODO spaw a sub-shell to not delay NM
  update $DHCP4_IP_ADDRESS "$DUMPS"
fi

echo -n "finish " >> $DUMPS
date >> $DUMPS

TODO debug path with space

https://developer.gnome.org/NetworkManager/stable/NetworkManager.html