Disassociate, generate new mac, reconnect

regenMac

#!/bin/bash

# arp -ani en0
# ^^ Get MAC addrs of other users on same network.
# Change en0 to your network interface.
# On macos, this can be seen through:
# networksetup -listallhardwareports

# sudo ifconfig en0 ether $MAC
# ^^ replace $MAC with an addr from above command

deviceOverride="${1}"

if [ -n $deviceOverride ]; then
	ifout="$(ifconfig $deviceOverride 2>/dev/null)"
	echo "$ifout" | grep 'status: active' > /dev/null 2>&1
	rc="$?"
	if [ "$rc" -eq 0 ]; then
		currentservice="User input"
		currentdevice="$deviceOverride"
		currentmac=$(echo "$ifout" | awk '/ether/{print $2}')
	fi
else
	services=$(networksetup -listnetworkserviceorder | grep 'Hardware Port')

	while read line; do
		sname=$(echo $line | awk -F  "(, )|(: )|[)]" '{print $2}')
		sdevice=$(echo $line | awk -F  "(, )|(: )|[)]" '{print $4}')
		#echo "Current service: $sname, $sdevice, $currentservice"
		if [ -n "$sdevice" ]; then
			ifout="$(ifconfig $sdevice 2>/dev/null)"
			echo "$ifout" | grep 'status: active' > /dev/null 2>&1
			rc="$?"
			if [ "$rc" -eq 0 ]; then
				currentservice="$sname"
				currentdevice="$sdevice"
				currentmac=$(echo "$ifout" | awk '/ether/{print $2}')
			fi
		fi
	done <<< "$(echo "$services")"
fi

if [ -n "$currentservice" ]; then
	printf "Service: $currentservice\nDevice: $currentdevice\nMAC:$currentmac\n"

	echo "Getting network password"
	ssid=$(/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | awk '/ SSID/ {print substr($0, index($0, $2))}')
	netpass=$(security find-generic-password -ga $ssid | awk  -F'"' '/password:/{print $2}')

	echo "Disassociating from current network"
	sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -z

	echo "Generating new MAC addr and assigning it"
	sudo ifconfig $currentdevice ether $(openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/./0/2; s/.$//')

	echo "Detecting new network hardware"
	networksetup -detectnewhardware

	newmac=$(ifconfig $currentdevice | awk '/ether/{print $2}')
	printf "New MAC: $newmac\n"

	echo "Reconnecting to the network"
	networksetup -setairportnetwork $currentdevice $ssid $netpass

	echo "Opening captive portal network"

	# This should open in default browser, but that wasn't working for me
	# open http://captive.apple.com/hotspot-detect.html

	# So use this to open in your favourite app
	# open -a "App Name" http://captive.apple.com/hotspot-detect.html

	open -a "Google Chrome Canary" http://captive.apple.com/hotspot-detect.html
else
	>&2 echo "Could not find current service"
	exit 1
fi