centos-ip.sh

#!/bin/bash

###
#
# 1. Gateway
# 2. Subnet mask
# 3. IP1
# ...
# n. IPn

### Get config information


if [ -f config.cfg ]
then
	FILE="config.cfg"
	gw=$(sed '1q;d' $FILE)
	subm=$(sed '2q;d' $FILE)
	IPS=$(tail -n +3 $FILE)
else
	echo "File config.cfg: Not found."
fi

IPprefix_by_netmask() { 
   c=0 x=0$( printf '%o' ${1//./ } )
   while [ $x -gt 0 ]; do
       let c+=$((x%2)) 'x>>=1'
   done
   echo $c;
}

all_get_if(){
## Get all interface on system and check IP assigned on each interface
for x in `ls /sys/class/net`
do
	IP=`ip -f inet -o addr show $x | cut -d\  -f 7 | cut -d/ -f 1`
	if [ -z "$IP" ] 
	then
		echo $x
	fi
done
}

all_routing_table(){

	## Adding routing table
	cp /etc/iproute2/rt_tables /etc/iproute2/rt_tables.bk
	echo -e "201\tgw100"  >> /etc/iproute2/rt_tables
}

centos_gen_format(){
	i=0
	for x in $IPS
	do
		## Adding rule
		echo "from $x table gw100 prio 1000" >> /etc/sysconfig/network-scripts/rule-$1
		## Generate format
		echo -e "IPADDR${i}=${x}\nNETMASK${i}=${subm}" >> /tmp/ipgen.tmp
		i=$(expr $i + 1)
	done
	echo "DEVICE=$1
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=static
$(cat /tmp/ipgen.tmp)
ZONE=public" > /etc/sysconfig/network-scripts/ifcfg-$1
	rm -rf /tmp/ipgen.tmp
}

centos_main(){

	CARD=$(all_get_if)

	GATEWAY=${gw}

	## Genarate format configure 
	centos_gen_format ${CARD}

	all_routing_table

	## Adding Gateway
	echo "default via ${GATEWAY} table gw100"  >> /etc/sysconfig/network-scripts/route-${CARD}
	ip link set dev ${CARD} up
}

# centos_main

ubuntu_gen_format(){
	cp /etc/network/interfaces /etc/network/interfaces.bk-`date +%Y%m%d%H%M%S`
	i=0
	CARD=$1
	for x in $IPS
	do
		NETWORK=$(echo $x | awk -F '.' '{print $1, $2, $3, "0"}' | sed 's/ /\./g')
		if [ $i == 0 ]
		then
			PREFIX=$(IPprefix_by_netmask $subm)
			IP=$(echo ${x}/$PREFIX)
			echo -e "auto $CARD
\tiface $CARD inet static
\taddress $x
\tnetmask $subm
\tpost-up ip route add $NETWORK/$PREFIX dev $CARD src $x table gw100
\tpost-up ip route add default via $gw dev $CARD table gw100
\tpost-up ip rule add from $IP table gw100
\tpost-up ip rule add to $IP table gw100" > /tmp/ipgen.tmp
		else
		
			echo -e "\tpost-up ip addr add $x/$PREFIX dev $CARD label $CARD:$i" >> /tmp/ipgen.tmp
			# i=$(expr $i + 1)
		fi
		i=$(expr $i + 1)
	done
	cat /tmp/ipgen.tmp >> /etc/network/interfaces
	rm -rf /tmp/ipgen.tmp
}


ubuntu_main(){

	CARD=$(all_get_if)

	## Genarate format configure 
	ubuntu_gen_format ${CARD}
	all_routing_table
	service networking restart
}

centos_main
# ubuntu_main