rotate_mac.sh

#!/bin/sh

# list of MAC addresses, 1 per line
MACFILE="/jffs/etc/config/maclist"

# current mac address
current_mac=$( nvram get def_hwaddr )
# get current MAC index from file
macindex=$( grep -n $current_mac $MACFILE | cut -f1 -d: )

# if we didn't find a match, don't do anything
if [ -z $macindex ] ; then
 exit
fi

# increment the index we have
macindex="$( expr $macindex + 1 )"

# get the length of our MAC file
file_length="$( wc -l $MACFILE | cut -f1 -d' ' )"

# wrap around if index is more than
# number of lines in MAC list file
if [ $macindex -gt $file_length ] ; then
 macindex=1
fi

# get new MAC from file
new_mac=$( sed -n ${macindex}p $MACFILE )
#echo "New MAC: $new_mac"

# set new value in nvram
nvram set def_hwaddr=$new_mac
ifdown eth1
wl down
# wait 45 seconds and bring wlan back up
sleep 45
ifconfig eth1 hw ether $new_mac
sleep 2
wl restart
ifup eth1
wl up