point_squid_to_vpn.sh

# Sets tcp_outgoing_address in squid.conf to point to IP of ppp0
# Ensure the line tcp_outgoing_address already exists in squid.conf!

# Crontab set up to reconnect Mac OS VPN like so: 
# */1 * * * *  networksetup -connectpppoeservice "VPN"; ~/SCRIPTS/SetProxyIP.sh;

export VPNIP=''
CONFDIR=/usr/local/etc/squid.conf

for i in 1 2 3 4 5; do
        # Parse ifconfig for the IP of ppp9
        export VPNIP="$(ifconfig ppp0 | sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p')"
        echo "GETTING VPN IP" $VPNIP
        
        # If we got something that looks like an IP...
        if [[ $VPNIP =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]];
        then
                # Rewrite Squid conf with that address
                sed -i .bak 's/.*tcp_outgoing_address.*.*/tcp_outgoing_address '$VPNIP'/' $CONFDIR
                #kill -9 `cat /tmp/squid.pid` || :
                #killall squid
                #/usr/local/squid/sbin/squid -f ~/Library/Preferences/squid.conf
                
                # Then hot reload
                /usr/local/opt/squid/sbin/squid -k reconfigure
                break
        fi
        sleep 1
done