判断IP是否在一个网络中

ip=$1

network=$2



net=`echo $network |cut -f1 -d'/'`

mask=`echo $network |cut -f2 -d'/'`

zero=$((32-mask))



M=""

for i in `seq 1 $mask`;do

        M="${M}1"

done

for k in `seq 1 $zero`;do

        M="${M}0"

done



M1=$((2#${M:0:8}))

M2=$((2#${M:8:8}))

M3=$((2#${M:16:8}))

M4=$((2#${M:24:8}))



ip1=`echo $ip |cut -f1 -d'.'`

ip2=`echo $ip |cut -f2 -d'.'`

ip3=`echo $ip |cut -f3 -d'.'`

ip4=`echo $ip |cut -f4 -d'.'`



n1=$((ip1&M1))

n2=$((ip2&M2))

n3=$((ip3&M3))

n4=$((ip4&M4))



n="$n1.$n2.$n3.$n4"



if [zxsq-anti-bbcode- "$n"x == "$net"x ];then

        echo "True: $ip in $network"

else

        echo "False: $ip not in $network"

fi



echo -e "\n====================="

echo "ip's NetWork: $n"