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Editing File: /usr/local/cpanel/whostmgr/bin/ipaliases

#!/bin/bash
### BEGIN INIT INFO
# Provides: ipalises
# Required-Start: $network
# Defalt-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Description: Activates/Deactivates all ip aliases
### END INIT INFO
#
# ipaliases       Bring up/down ipaliases
# chkconfig: 2345 11 91
#

success() {
    echo -en "\\033[60G[\\033[1;32m  OK  \\033[0;39m]\r"
    return 0
}

failure() {
    local rc=$?
    echo -en "\\033[60G[\\033[1;31mFAILED\\033[0;39m]\r"
    [ -x /bin/plymouth ] && /bin/plymouth --details
    return $rc
}

action() {
    local STRING=$1
    echo -n "$STRING "
    shift
    "$@" && success $"$STRING" || failure $"$STRING"
    local rc=$?
    echo
    return $rc
}

if [ ! -f /etc/ips ]; then
    exit 0
fi

[ -x /sbin/ip ] || exit 0

#
# Function calculates number of bit in a netmask
#
mask2cidr() {
    nbits=0
    IFS=.
    for dec in $1 ; do
        case $dec in
            255) let nbits+=8;;
            254) let nbits+=7;;
            252) let nbits+=6;;
            248) let nbits+=5;;
            240) let nbits+=4;;
            224) let nbits+=3;;
            192) let nbits+=2;;
            128) let nbits+=1;;
            0);;
            *) echo "Error: $dec is not a valid netmask value" >&2;;
        esac
    done
    echo "$nbits"
}

#
# Create a bitmask based on the number of bits in the CIDR
#
cidr2mask() {
	local i mask=""
	local full_octets=$(($1/8))
	local partial_octet=$(($1%8))

for ((i=0;i<4;i+=1)); do
		if [ $i -lt $full_octets ]; then
		    mask+=255
		elif [ $i -eq $full_octets ]; then
		    mask+=$((256 - 2**(8-$partial_octet)))
		else
		    mask+=0
		fi
		test $i -lt 3 && mask+=.
	done

echo $mask
}

ETHDEV=`grep ETHDEV /etc/wwwacct.conf | awk '{print $2}'`
defaultmask="255.255.255.0"
mainip=`grep -o -E '([0-9]{1,3}\.){3}[0-9]{1,3}' /var/cpanel/mainip | head -n1`

# Don't break an existing network config if the main IP isn't known:
if [ -z "$mainip" ]; then
	echo 'Could not find an IP address in /var/cpanel/mainip; network configuration will not be changed. Consider running /usr/local/cpanel/scripts/mainipcheck first to correct this.'
	exit 1
fi

if [ "$ETHDEV" = "" ]; then
	ETHDEV=eth0
fi
if [ "$ETHDEV" = " " ]; then
	ETHDEV=eth0
fi

# See how we were called.
case "$1" in
  start)

# Wait for ETHDEV to be up, as this is not guaranteed to be so on systems
    # which use NetworkManager. Redirect STDERR to /dev/null because some
    # systems will not have this unit existing even, and that's annoying.
    if [ "$(/usr/bin/systemctl is-enabled NetworkManager 2>/dev/null)" == 'enabled' ]; then
        printf "Checking if NetworkManager is started..."
        until [ "$(/usr/bin/nmcli -t -f RUNNING general)" == 'running' ]; do
            printf '.';
        done
        printf "\nChecking if $ETHDEV is up...";
        timeout 60 /bin/bash -c -- "while /usr/bin/nmcli -g GENERAL.STATE c s 'System $ETHDEV' | /usr/bin/grep -v activated; do printf '.'; done"
        printf "\n";
    fi

# Compile two lists: interfaces that already exist, and interfaces that must be created
	exists=''
	create=''
	ifcfg=`/sbin/ip -4 addr show | grep -E "inet[^0-9]"`
	for ip in `cat /etc/ips | grep -E -v "\\b$mainip\\b"`; do
		broadcast=`echo $ip | awk -F: '{ print $3 }'`
		netmask=`echo $ip | awk -F: '{ print $2 }'`
		ip=`echo $ip | awk -F: '{ print $1 }'`
		if [ "$netmask" = "" ]; then
			netmask=$defaultmask
			broadcast=`echo $ip | awk -F. '{ print $1"."$2"."$3".255" }'`
		fi
		if [ "$netmask" = "255.255.255.0" ]; then
			broadcast=`echo $ip | awk -F. '{ print $1"."$2"."$3".255" }'`
		fi
		found=`echo "$ifcfg" | awk '{intf=$NF} /[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*/ {print intf $0}' | grep -E "inet[^0-9]+$ip\\b"`
		if [ "$found" != "" ]; then
			intf=`echo $found | awk '{print $1}'`
			exists="$exists $intf,$ip,$netmask,$broadcast"
		else
			create="$create $ip,$netmask,$broadcast"
		fi
	done

if [ "$exists" != "" ]; then
		# Compile two lists: interfaces with the correct mask, and interfaces whose masks have changed
		# If any interfaces have to be taken down, we may need to rebuild them *all*,
		# since deleting a primary interface deletes all its secondary interfaces as well
		masksame=''
		maskdiff=''
		for ex in $exists ; do
			broadcast=`echo $ex | awk -F, '{ print $4 }'`
			netmask=`echo $ex | awk -F, '{ print $3 }'`
			ip=`echo $ex | awk -F, '{ print $2 }'`
			intf=`echo $ex | awk -F, '{ print $1 }'`
			cidr=$(mask2cidr $netmask)
			ipfull="$ip/$cidr"
			match=`/sbin/ip -4 addr show | grep -E "inet[^0-9]+$ipfull\\b"`
			if [ "$match" != "" ]; then
				masksame="$masksame $ex"
			else
				maskdiff="$ex $maskdiff"
				echo "Address $ip is already configured on $intf, but mask has changed to $netmask"
				# Verify that it's still up before trying to take it down;
				# Suppresses an error msg if it's a secondary interface that got nuked when we deleted a primary
				found=`/sbin/ip -4 addr show dev $intf | grep -E "inet[^0-9]+$ip\\b"`
				if [ "$found" != "" ]; then
					ipfull=`echo $found | awk '{print $2}'`
					action "UnRouting $ip" /sbin/ip route del $ip dev $intf
					action "Shutting down $intf" /sbin/ip addr del $ipfull $intf
				fi
			fi
		done

# Rebuild the interfaces that got taken down in the previous step, if any
		if [ "$maskdiff" != "" ]; then
			for md in $maskdiff ; do
				broadcast=`echo $md | awk -F, '{ print $4 }'`
				netmask=`echo $md | awk -F, '{ print $3 }'`
				ip=`echo $md | awk -F, '{ print $2 }'`
				intf=`echo $md | awk -F, '{ print $1 }'`
				cidr=$(mask2cidr $netmask)
				ipfull="$ip/$cidr"
				if [ "$broadcast" == "" ]; then
					action "Bringing up $intf" /sbin/ip addr add $ipfull dev $intf label $intf
				else
					action "Bringing up $intf" /sbin/ip addr add $ipfull broadcast $broadcast dev $intf label $intf
				fi
				action "Routing $ip" /sbin/ip route add src $ip to $ip dev $intf
			done
		fi

# For all the interfaces that aren't changing, make sure they are still there,
		# and rebuild any that are not, using the same interface name.
		# We need to rebuild these before building the new ('create') interfaces,
		# so we can preserve the original interface names without conflicting with the names of the new interfaces
		if [ "$masksame" != "" ]; then
			for ms in $masksame ; do
				broadcast=`echo $ms | awk -F, '{ print $4 }'`
				netmask=`echo $ms | awk -F, '{ print $3 }'`
				ip=`echo $ms | awk -F, '{ print $2 }'`
				intf=`echo $ms | awk -F, '{ print $1 }'`
				cidr=$(mask2cidr $netmask)
				ipfull="$ip/$cidr"
				found=`/sbin/ip -4 addr show dev $intf | grep -E "inet[^0-9]+$ip\\b"`
				if [ "$found" != "" ]; then
					echo "Address $ip/$netmask is already configured on $intf"
				else
					echo "Address $ip/$netmask was configured on $intf but must be reset"
					if [ "$broadcast" == "" ]; then
						action "Bringing up $intf" /sbin/ip addr add $ipfull dev $intf label $intf
					else
						action "Bringing up $intf" /sbin/ip addr add $ipfull broadcast $broadcast dev $intf label $intf
					fi
					action "Routing $ip" /sbin/ip route add src $ip to $ip dev $intf
				fi
			done
		fi
	fi

# Build all the interfaces that didn't previously exist.
	if [ "$create" != "" ]; then
		dev=0
		cpused=`/sbin/ip -4 addr show | awk '{ print $NF";"}' | grep ':cp'`
		for cr in $create ; do
			broadcast=`echo $cr | awk -F, '{ print $3 }'`
			netmask=`echo $cr | awk -F, '{ print $2 }'`
			ip=`echo $cr | awk -F, '{ print $1 }'`
			cidr=$(mask2cidr $netmask)
			ipfull="$ip/$cidr"
			# Find the next available numerical suffix, avoid naming conflicts with pre-existing interfaces
			dev=$(($dev+1))
			while [ ""`echo "$cpused" | grep "$ETHDEV:cp$dev;"` != "" ]; do
				dev=$(($dev+1))
			done
			if [ "$broadcast" == "" ]; then
				action "Bringing up $ETHDEV:cp$dev" /sbin/ip addr add $ipfull dev $ETHDEV label $ETHDEV:cp$dev
			else
				action "Bringing up $ETHDEV:cp$dev" /sbin/ip addr add $ipfull broadcast $broadcast dev $ETHDEV label $ETHDEV:cp$dev
			fi
			action "Routing $ip" /sbin/ip route add src $ip to $ip dev $ETHDEV:cp$dev
		done
	fi

/usr/local/cpanel/bin/clear_iplist_cache
	;;
  list)
	ifcfg=`/sbin/ip -4 addr show | grep -E "inet[^0-9]"`
	for ip in `cat /etc/ips | grep -E -v "\\b$mainip\\b"`; do
		broadcast=`echo $ip | awk -F: '{ print $3 }'`
		netmask=`echo $ip | awk -F: '{ print $2 }'`
		ip=`echo $ip | awk -F: '{ print $1 }'`
		if [ "$netmask" = "255.255.255.0" ]; then
			broadcast=`echo $ip | awk -F. '{ print $1"."$2"."$3".255" }'`
		fi
		found=`echo "$ifcfg" | awk '{intf=$NF} /[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*/ {print intf $0}' | grep -E "inet[^0-9]+$ip\\b"`
		if [ "$found" != "" ]; then
			intf=`echo $found | awk '{print $1}'`
		else
			intf='(Unavailable)'
		fi
		if [ "$netmask" = "" ]; then
			echo "$intf $ip"
		elif [ "$broadcast" = "" ]; then
			echo "$intf $ip $netmask"
		else
			echo "$intf $ip $netmask $broadcast"
		fi
	done
	;;
  stop)
	dev=1
	ips=`cat /etc/ips  | grep -E -v "\\b$mainip\\b"`
	addrs=`cat /etc/ips  | grep -E -v "\\b$mainip\\b" | awk -F: '{print ":"$1":"}'`
	TAC=`which tac`
	if [ "$TAC" == "" ]; then
		TAC='sort -r'
	fi
	# Traverse the list of interfaces in descending order,
	# so that we take down secondary interfaces before header interfaces
	for dev in `/sbin/ip -4 addr show | grep inet  | grep "$ETHDEV:" | awk '{ print $NF }' | $TAC`; do
		conf=`/sbin/ip -4 addr show label $dev | grep -P '\d+\.\d+\.\d+\.\d+'`
		[ "$conf" != "" ] || continue
		ipfull=`echo $conf | awk '{print $2}'`
		confaddr=`echo $ipfull | awk -F/ '{print $1}'`
		iscpanel=`echo $dev | grep ":cp"`
		if [ "$iscpanel" != "" ]; then
			# if this is a cpanel interface, we *must* shut it down
			if [ "$confaddr" != "" ]; then
				route=`/sbin/ip -4 route list | grep -E "\\b$confaddr\\b"`
				if [ "$route" != "" ]; then
					action "UnRouting $confaddr" /sbin/ip route del $confaddr dev $dev
				fi
				action "Shutting down $dev" /sbin/ip addr del $ipfull dev $dev
			fi
			continue
		fi

# not a cpanel interface (maybe); if it matches an /etc/ips address, shut it down anyway
		match=`echo $addrs | grep ":$confaddr:"`
		[ "$match" != "" ] || continue

for ip in $ips; do
			ipaddr=`echo $ip | awk -F: '{ print $1 }'`
			[ "$ipaddr" == "$confaddr" ] || continue

# If the netmask is known, make sure it matches
			netmask=`echo $ip | awk -F: '{ print $2 }'`
			if [ "$netmask" != "" ]; then
				match=`echo $conf | grep -E "\\b$ipaddr\\b" | grep -E "\\b$netmask\\b"`
				[ "$match" != "" ] || continue
			fi

# Get the cidr from the netmask
			cidr=$(mask2cidr $netmask)
			ipfull="$ipaddr/$cidr"

# Unroute the address and remove the interface
			route=`/sbin/ip -4 route list | grep -E "\\b$ipaddr\\b"`
			if [ "$route" != "" ]; then
				action "UnRouting $ipaddr" /sbin/ip route del $ipaddr dev $dev
			fi
			action "Shutting down $dev" /sbin/ip addr del $ipfull dev $dev

# Remove the address from the list, to eliminate redundant checks in subsequent iterations
			ips=`echo $ips | awk '{sub(/ *'$ip' */," "); print $0}'`
			addrs=`echo $addrs | awk '{sub(/ *:'$ipaddr': */," "); print $0}'`

# Don't bother checking any other addresses once we've found a match
			break
		done
	done
    /usr/local/cpanel/bin/clear_iplist_cache
	;;
  restart)
	$0 stop
	$0 start
	;;
  reload)
	$0 restart
	;;
  *)
	echo "Usage: ipaliases {start|stop|restart|reload}"
	exit 1
esac

exit 0

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