Set WiFi Hotspot

set_wifi_hotspot.sh

# by c4mx

set_wifi_hotspot () {
    if [ "$#" -ne 2 ]; then
        echo "Usage: $0 [start|stop] interface"
        return 1
    fi

    action=$1
    iface=$2

    ip link show "$iface"
    if [ "$?" -ne 0 ]; then
        echo "[-] Network interface \"$iface\" not found"
        return 1
    fi

    case $action in
    "start")
        echo "[+] Cleaning env..."
        sudo airmon-ng check kill
        echo "==================="

        echo "[+] Configuring IP address for $iface..."
        #sudo ifconfig $iface 192.168.150.1 || echo "[-] Cannot configure IP address"; return 1
        ip a show "$iface" | grep "192.168.150.1"
        if [ "$?" -ne 0 ]; then
            sudo ip addr flush dev "$iface"
            sudo ip addr add 192.168.150.1/24 dev "$iface"

            if [ "$?" -ne 0 ]; then
                echo "[-] Cannot configure IP address"
                return 1
            fi
        fi

        ip a show $iface
        echo "==================="

        echo "[+] Starting dnsmasq server..."
        sudo service dnsmasq restart
        if [ "$?" -ne 0 ]; then
            echo "[-] dnsmasq error";
            return 1
        fi
        echo "==================="

        echo "[+] Enabling kernel ip forwarding..."
        sudo sysctl net.ipv4.ip_forward=1
        echo "==================="

        echo "[+] Setting iptables NAT and forwarding..."
        sudo iptables -F
        sudo iptables -F -t nat
        sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
        sudo iptables -A FORWARD -i "$iface" -o eth0 -j ACCEPT
        sudo iptables -L -t nat -v
        sudo iptables -L -v
        echo "==================="

        echo "[+] Running hostapd daemon in the background..."
        sudo killall hostapd 2>/dev/null
        #sudo hostapd -d /etc/hostapd.conf
        sleep 3
        sudo hostapd -B /etc/hostapd/hostapd.conf
        if [ "$?" -ne 0 ]; then
            echo "[-] hostapd error";
            return 1
        fi
        echo "==================="
        ;;

    "stop")
        echo "[+] Stopping dnsmasq server..."
        sudo service dnsmasq stop
        echo "[+] Disabling kernel ip forwarding..."
        sudo sysctl net.ipv4.ip_forward=0
        echo "[+] Flushing iptables..."
        sudo iptables -F
        sudo iptables -F -t nat
        echo "[+] Killing hostapd daemon..."
        sudo killall hostapd 2>/dev/null
        ;;
    esac
}