#!/bin/bash

OS=`uname`
#remove the active ip from eth0:#
if [ "${OS}" = "FreeBSD" ]; then
	ETH_DEV=dc0
else
	ETH_DEV=eth0
fi
DACONF=/usr/local/directadmin/conf/directadmin.conf
if [ -s ${DACONF} ]; then
	if grep -m1 -q '^ethernet_dev=' ${DACONF}; then
		ETH_DEV=`grep -m1 '^ethernet_dev=' ${DACONF} | cut -d= -f2 | cut -d: -f1`
	fi
fi

SBIN_IP=/sbin/ip
if [ ! -x ${SBIN_IP} ] && [ -x /usr/sbin/ip ]; then
	SBIN_IP=/usr/sbin/ip
fi
if [ ! -x ${SBIN_IP} ] && [ "${OS}" != "FreeBSD" ]; then
	echo "Cannot find ${SBIN_IP} nor in other locations."
	exit 2
fi

# we need the ip to delete
if [ $# -ne "1" ] && [ $# -ne "2" ]; then
        echo "Usage: $0 <ip> (<condensed_ipv6>)";
        exit 1;
fi

if [ "${OS}" = "FreeBSD" ]; then
	if /sbin/ifconfig | grep -m1 -q " $1 "; then
		/sbin/ifconfig $ETH_DEV inet $1	-alias
	fi
else
	if ${SBIN_IP} a | grep -m1 -q " $1/"; then
		#"ip" accepts IPs without netmasks, but shows a warning that the feature might not be avail in the future, this we delete IP with its mask
		IP_TO_REMOVE="`${SBIN_IP} a | grep -m1 -o \" ${1}/[0-9]*\" | awk '{print $1}'`"
		${SBIN_IP} addr del ${IP_TO_REMOVE} dev ${ETH_DEV}
		if [ "$?" -ne 0 ] && /sbin/ip a | grep -m1 -q " $1/"; then
			#old code, should not be needed anymore, but we fallback to it if IP is still there
			IP=$1
			IPv6=0
			if [ $# -eq "2" ] && [ "$2" != "" ]; then
				IP=$2
				/sbin/ifconfig $ETH_DEV del $IP/64

				IPv6=1
			fi

			#for each eth0:#, if ifconfig eth0:# has $1 (the ip) delete eth0:#
			for i in `/sbin/ifconfig | grep $ETH_DEV: | cut -d\  -f1 | cut -d: -f1,2`; do
			{
				NUMIP=`/sbin/ifconfig $i | grep -c "${IP} "`;
				
				if [ $NUMIP -gt "0" ];
				then
				{
					#we found the interface with the ip

					COLCOUNT=`echo $i | grep -c :`
					if [ "${COLCOUNT}" -gt 0 ] && [ -e /etc/debian_version ] && [ "${IPv6}" -eq 0 ]; then
						/sbin/ifconfig $i down
					else
						/sbin/ifconfig $i del $IP	#remove from the interface
					fi
					
					#it appears as though the ip is automatically removed from `route`

					exit 0
				}
				fi
			};
			done
		fi
	fi
fi

exit 0
#can't find it, it must be gone