#!/bin/sh

# filename: get_net.sh

default_route=$(ip route show)

default_interface=$(echo $default_route | sed -e 's/^.*dev \([^ ]*\).*$/\1/' | head -n )

address=$(ip addr show label $default_interface scope global | awk '$1 == "inet" { print $2,$4}')

#ip address

ip=$(echo $address | awk '{print $1 }')

ip=${ip%%/*}

#broadcast

broadcast=$(echo $address | awk '{print $2 }')

#mask address

mask=$(route -n |grep 'U[ \t]' | head -n 1 | awk '{print $3}')

#gateway address

gateway=$(route -n | grep 'UG[ \t]' | awk '{print $2}')

#dns

dns=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2}')

echo ip:$ip,mask:$mask,broadcast:$broadcast,gateway:$gateway,dns:$dns