#!/bin/bash
DATE=$(TZ=Europe/Copenhagen date +"%F %H:%M:%S")
ww=$(nmcli -g GENERAL.DEVICES con show door_sim | while read dev; do nmcli -g GENERAL.IP-IFACE device show "$dev"; done)
#echo $ww
ip_wwan0=$(/sbin/ip -o -4 addr list $ww | awk '{print $4}' | cut -d/ -f1)
#echo $ip_wwan0
FREEDNS_DOMAIN_0=doorbell.doordk.com
echo "$DATE $ww IP: $ip_wwan0 Domain: $FREEDNS_DOMAIN_0"

static_address="80.91.3.214"

# Returns true if iface exists and is up, otherwise false.
function ifup {
    typeset output
    output=$(ip link show $ww up) && [[ -n $output ]]
}

if ifup $ww; then
	#echo "wwan0 exists and is up"

	ping -c1 "8.8.8.8" &>"/dev/null"

	if [[ "${?}" -ne 0 ]]; then
		echo "offline. Take action?"
	elif [[ "${#args[@]}" -eq 0 ]]; then
		#echo "online"
		if [ "$ip_wwan0" != "$static_address" ];then
			echo "$DATE No $static_address ip address. Take action?"
			#echo "No wwan0 $static_address ip address. Take action?" | systemd-cat -t wwan0_sim7600 -p emerg
		else
			#echo "We have wwan0 $ip_wwan0"

			if : >/dev/tcp/8.8.8.8/53; then
				#echo "$DATE wwan0 is on internet"
				#FREEDNS_DOMAIN_0=doorbell.doordk.com
				FREEDNS_DOMAINHASHKEY_0=NEp1d2VnZTRsbXNaRzB5dkdIb0tEZ0IxOjIwNjQzODQ5 
				registered_ip_0=$(ping -qn -c 1 $FREEDNS_DOMAIN_0 | head -n 1 | grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}')
				#registered_ip_0=$(curl --silent "https://freedns.afraid.org/dynamic/update.php?$FREEDNS_DOMAINHASHKEY_0"  | grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}')
				UPDATE_URL_0="http://freedns.afraid.org/dynamic/update.php?$FREEDNS_DOMAINHASHKEY_0&address=$static_address"
				#echo "$DATE wwan0: $ip_wwan0 is on internet. Freedns reg ip addresse: $registered_ip_0"
				#

				if [ "$static_address" ] ; then
					if [ "$static_address" != "$registered_ip_0" ]; then
						echo "$DATE $FREEDNS_DOMAIN_0 Update from $registered_ip_0 to $static_address"
						wget -q --read-timeout=0.0 --waitretry=5 --tries=400 --background $UPDATE_URL_0
					fi
				fi
			else
				echo "$DATE wwan0 is NOT on internet. Take action?"
				#echo "wwan0 is NOT on freedns internet. Take action?" | systemd-cat -t wwan0_sim7600 -p emerg
			fi
		fi
	fi
else
	echo "wwan0 does not exists. Take action?"
fi