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#!/bin/sh
### 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
#
# Source function library.
if [ -f /etc/init.d/functions ]; then
. /etc/init.d/functions
elif [ -f /etc/rc.d/init.d/functions ]; then
. /etc/rc.d/init.d/functions
else
echo "Could not find functions file, your system may be broken"
exit 1
fi
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 $2}'`
defaultmask="255.255.255.0"
mainip=`cat /var/cpanel/mainip`
if [ "$ETHDEV" = "" ]; then
ETHDEV=eth0
fi
if [ "$ETHDEV" = " " ]; then
ETHDEV=eth0
fi
# See how we were called.
case "$1" in
start)
# Compile two lists: interfaces that already exist, and interfaces that must be created
exists=''
create=''
ifcfg=`/sbin/ip -4 addr show | grep -E "inet[^0-9]"`
for ip in `cat /etc/ips | grep -E -v "\\b$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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