$ wget https://www.stunnel.org/downloads/stunnel-4.56-android.zip

$ unzip stunnel-4.56-android.zip

$ cd stunnel-4.56-android

$ nano stunnel.conf

pid = /data/data/org.stunnel/stunnel.pid
compression = zlib
client = yes

[squid]
accept = localhost:8080
connect = SERVER_IP:PORT

$ nano 99stunnel

#!/system/bin/sh

STUNNEL=/system/bin/stunnel
STUNNEL_CONF=/etc/stunnel.conf
LOG=/sdcard/data/stunnel.log

if [ -e $LOG ]; then
        rm $LOG;
fi;

if [ ! -e $STUNNEL ]; then
        echo stunnel binary not found | tee -a $LOG
        exit 1;
fi;

if [ ! -e $STUNNEL ]; then
        echo stunnel configuration file not found | tee -a $LOG
        exit 1;
fi;

echo "$( date +"%Y.%m.%d %H:%M:%S" ) starting stunnel" | tee -a $LOG
$STUNNEL $STUNNEL_CONF | tee -a $LOG

PID="$( pidof stunnel)"
if [ -z $PID ]; then
        echo stunnel was not started properly | tee -a $LOG
        exit 1;
else
        echo stunnel running with pid $PID | tee -a $LOG;
fi;

exit 0;

$ chmod +x 99stunnel

$ adb root

$ adb shell mount -o rw,remount /system

$ adb shell mkdir /data/data/org.stunnel

$ adb push stunnel /system/bin/

$ adb push stunnel.conf /etc/

$ adb push 99stunnel /etc/init.d/

$ adb shell

$ adb /etc/init.d/99stunnel start

$ su -

# /etc/init.d/99stunnel start