LinuxGSM/functions/fn_check_ip

#!/bin/bash
# LGSM fn_check_ip function
# Author: Daniel Gibbs
# Website: http://danielgibbs.co.uk
# Version: 210115

# Description: Automatically identifies the server interface IP.
# If multiple interfaces are detected the user will need to manualy set using ip="0.0.0.0".

if [ ! -f /bin/ip ]; then
	ipcommand="/sbin/ip"
else
	ipcommand="ip"
fi
getip=$(${ipcommand} -o -4 addr|awk '{print $4 }'|grep -oe '\([0-9]\{1,3\}\.\?\)\{4\}'|grep -v 127.0.0)
getipwc=$(${ipcommand} -o -4 addr|awk '{print $4 }'|grep -oe '\([0-9]\{1,3\}\.\?\)\{4\}'|grep -vc 127.0.0)

if [ "${ip}" == "0.0.0.0" ]||[ "${ip}" == "" ]; then
	if [ "${getipwc}" -ge "2" ]; then
		fn_printwarn "Multiple active network interfaces found.\n\n"
		echo -en "Manually specify the IP you want to use within the ${selfname} script.\n"
		echo -en "Set ip=\"0.0.0.0\" to one of the following:\n"
		echo -en "${getip}\n"
		exit
	else
		ip=${getip}
	fi
fi