#!/bin/sh +x

# script to help meshnodes make an autoupdate
# a node which looses connection (because a uplink mesh node is talking newer 
# batman v15) try to log in as client in a network with well known essid
# and forces a autoupdate (if it is turned on in general)
#
# this script do not do any harm if running for years, we suggest running once a day
# more Info: https://github.com/viisauksena/gluon-v14tov15-helper
#
# maybe you have to adjust nameservers, etc/hosts entry and fallback-ffssid
# below

# some cron debug help , write in ram 
echo "$0 successfully start at $(date +%y%m%d_%H%M)" > /tmp/v14_lastrun

# if your script is dependend on autoupdater, do only uptate if its realy enabled!
if [ $(uci get autoupdater.settings.enabled) = 0 ]; then 
	echo "autoupdater not active - exit" > /tmp/v14_lastrun 
	exit 1
fi

# check gw
# quick and dirty do it 4 times every 30 seconds
# to highly prevent false positives
gwl=$(batctl gwl -H -n |grep gateways | wc -l)
if [ $gwl -eq 0 ]; then echo "find batctl gwl - exit1" >> /tmp/v14_lastrun; exit 11; fi ; sleep 30
gwl=$(batctl gwl -H -n |grep gateways | wc -l)
if [ $gwl -eq 0 ]; then echo "find batctl gwl - exit2" >> /tmp/v14_lastrun; exit 12; fi ; sleep 30 
gwl=$(batctl gwl -H -n |grep gateways | wc -l)
if [ $gwl -eq 0 ]; then echo "find batctl gwl - exit3" >> /tmp/v14_lastrun; exit 13; fi ; sleep 30 
gwl=$(batctl gwl -H -n |grep gateways | wc -l)
if [ $gwl -eq 0 ]; then echo "find batctl gwl - exit4" >> /tmp/v14_lastrun; exit 14; fi

# check if freifunk as we know it is nearby
# ffssid=$(uci get wireless.client_radio0.ssid) # fail with simplified ssid offline changer
: ${ffssid:=freiburg.freifunk.net} # if for whatever reason ffssid is NULL, obviously not generic
many=$(iwinfo phy0 scan |grep "$ffssid" | wc -l)

# connect to freifunk and get dhcp lease
if [ $many != 0 ]; then
	# generate foo mac, and alternative if failing
        foomac=42:42:$(iwinfo | grep Acc |head -n1 |grep -oE '[^ ]+$' |cut -d":" -f 3-6)
	: ${foomac:=42:42:23:$(date +%H:%M:%S)}
	# install new if in /etc/config/wireless if needed
	if [ $(uci get wireless.update_radio0.ifname) != "update" ];then
	        echo "insert update IF via uci try wifi restart" >> /tmp/v14_lastrun
		uci set wireless.update_radio0=wifi-iface
		uci set wireless.update_radio0.ifname=update
		uci set wireless.update_radio0.network=update
		uci set wireless.update_radio0.disabled=0
		uci set wireless.update_radio0.device=radio0
		uci set wireless.update_radio0.mode=sta
		uci set wireless.update_radio0.macaddr=$foomac
		uci set wireless.update_radio0.ssid=$ffssid
	else 
		echo "reactivate known update if and restart wifi" >> /tmp/v14_lastrun
		uci set wireless.update_radio0.disabled=0
	fi
	# restart wifi and get ip 
	wifi; sleep 5;
        echo "accept ra on update if and try to get ip" >> /tmp/v14_lastrun
	echo 2 > /proc/sys/net/ipv6/conf/update/accept_ra
	udhcpc -B -b -i update
else 
	echo "no ssid : __ $ffssid __ found, exit" >> /tmp/v14_lastrun
	exit 33
fi

# in case dns doesnt work correctly
# (sorry, not generic - so please adjust)
echo "nameserver 10.60.0.100" >> /tmp/resolv.conf
echo "nameserver 4.2.2.2" >> /tmp/resolv.conf
echo "nameserver 10.60.0.110" >> /tmp/resolv.conf

# failsafe hardcoded ip for updateservers
# (sorry, not generic - so please adjust)
if [ $(cat /etc/hosts|grep "fdf0:9bb:7814:a630::007"|wc -l) = 0 ]; then
	echo "fdf0:9bb:7814:a630::007 firmware.fffr" >> /etc/hosts
fi
#if [ $(cat /etc/hosts|grep "2001:470:25:713::2"|wc -l) = 0 ]; then
#	echo "2001:470:25:713::2 openfreiburg.de" >> /etc/hosts
#fi
if [ $(cat /etc/hosts|grep "178.254.39.111"|wc -l) = 0 ]; then
        echo 178.254.39.111 openfreiburg.de >> /etc/hosts
fi
if [ $(cat /etc/hosts|grep "fdf0:9bb:7814:a630::b45b"|wc -l) = 0 ]; then
        echo "fdf0:9bb:7814:a630::b45b 1.updates.services.fffr" >> /etc/hosts
fi

# here comes the funny part, regular
# also means update server MUST be reachable as client
autoupdater -f

# if autoupdater and first checks above run correct you should never reach this point
# better safe than sorry - taking new IF down
# could be while download and/or manifest-signing or checksum check fails
# fails also if device memory is/was_ever full : i/o error
if [ $(uci get wireless.update_radio0.disabled) = 0 ]; then
	uci set wireless.update_radio0.disabled=1
fi
wifi
logger "something strange happens - could not autoupdate via $0"
exit 21