Instant Wi-Fi AP

hot-spot.sh

#!/bin/bash -e

# Instant Wi-Fi AP
#
# Dependencies: sudo apt-get install macchanger hostapd

if [ "$#" != '3' ]; then
    echo 'Usage: <SSID> <channel> <passphrase>' 1>&2
    exit 1
fi

SSID="$1"
CHANNEL="$2"
PASSPHRASE="$3"

BRIDGE_IFACE=br0
MAIN_IFACE=eth0
WIFI_IFACE=wlan0

HOSTAPD_CONF="
interface=$WIFI_IFACE
bridge=$BRIDGE_IFACE
ssid=$SSID
channel=$CHANNEL
wpa=3 # 0b11
wpa_passphrase=$PASSPHRASE
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP TKIP
rsn_pairwise=CCMP
"

log() {
    printf '\e[35m[+] \e[32m%s\e[0m\n' "$1"
}

setup() {
    log 'Spoofing the AP address'
    macchanger -r "$WIFI_IFACE"
    log 'Setting up the bridge'
    ip link add "$BRIDGE_IFACE" type bridge
    ip link set "$BRIDGE_IFACE" up
    ip link set "$MAIN_IFACE" master "$BRIDGE_IFACE"
}

cleanup() {
    log 'Removing the bridge'
    ip link delete "$BRIDGE_IFACE"
    ip link set "$MAIN_IFACE" nomaster
    log 'Bye!'
}

run() {
    log 'Starting the AP'
    hostapd 2>&1 <(echo "$HOSTAPD_CONF")
}

trap cleanup EXIT
setup
run