ubuntu wireless – ¿Alerta cuando se detecta una red wifi?

Pregunta:

¿Hay alguna forma de reproducir un sonido para alertarme cuando se detecta una red wifi (inalámbrica)?

Respuesta:

El problema es que no hay un programa / servicio / demonio específico para verificar cuando una nueva red inalámbrica aparece / desaparece en / del rango de la antena inalámbrica que yo sepa (de hecho, hay airodump-ng y tal vez otros, pero esto entra en conflicto con Network Manager).

Como alternativa, puede buscar redes wifi de vez en cuando, utilizando la herramienta iwlist .

Nota: En las pruebas, la herramienta iwlist solo puede funcionar con tarjetas Atheros, Intel o Broadcom.

Dicho esto, el siguiente script puede hacer lo que desee (lo wifidetect ):

#!/bin/bash

#wifidetect - Alert when new wireless 

#Licensed under the standard MIT license:
#Copyright 2013 Radu Rădeanu (http://askubuntu.com/users/147044/).
#Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
#The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE

DISPLAY=:0.0
#change 'username' with your username
HOME=/home/username/
XAUTHORITY=$HOME/.Xauthority
export DISPLAY XAUTHORITY HOME

#check if you run the script as root
if [ "$(whoami)" != "root" ]; then
    notify-send -i error "You must to run $(basename $0) script as root."
    echo "You must to run $(basename $0) script as root."
    exit
fi

#check if beep is installed
if [ ! -n "$(dpkg -s beep 2>/dev/null | grep 'Status: install ok installed')" ]; then
    notify-send -i error "The package 'beep' must to be installed before to run $(basename $0)." "Use 'sudo apt-get install beep' command in terminal to install it."
    echo -e "The package 'beep' must to be installed before to run $(basename $0)\nUse 'sudo apt-get install beep' command in terminal to install it."
    exit
fi

[ -f /tmp/networks ] || > /tmp/networks

#scan for networks - need root privileges
#change 'wlan0' with your interface name of your wireless network card; you can find it using 'ls /sys/class/net' command
sudo iwlist wlan0 scan | grep -E "Address|ESSID" |  awk 'BEGIN {FS=": |\""} {print $2}' | sed 'N;s/\n/ /' | sort > /tmp/new_networks

#check if there are new networks
new_networks=$(comm -1 -3 /tmp/networks /tmp/new_networks)
new_essids=$(echo $new_networks | sed "s/..:..:..:..:..:..//g" | sed "s/  /, /g")

if [ -n "$new_networks" ]; then   #if there are new networks
    #send a graphical notification
    notify-send -i /usr/share/app-install/icons/wifi-radar.svg "New network(s) detected:" "$new_essids"
    #send a sound notification
    pcspkr_on=$(lsmod | grep pcspkr)
    if [ -n "$pcspkr_on" ]; then 
        beep
    else 
        sudo modprobe pcspkr
        beep
        sudo modprobe -r pcspkr
    fi

    #change the old list of networks with the list containing new networks
    #the networks that were detected in the previous scan and wern't detected this time will be removed from the list
    cat /tmp/new_networks > /tmp/networks

    #if you want that only the new networks detected (who were not detected in previous scans) to be added to list, comment the previous line and and uncomment the following three
    #cat /tmp/networks > /tmp/tmp_networks
    #cat /tmp/new_networks >> /tmp/tmp_networks
    #cat /tmp/tmp_networks | sort | uniq > /tmp/networks
fi

Nota: wlan0 cambiar el username script con su nombre de usuario y wlan0 con el nombre de la interfaz de su tarjeta de red inalámbrica; puede encontrarlo usando el comando 'ls / sys / class / net'.

No olvide hacer que el script sea ejecutable, usando el siguiente comando en la terminal:

chmod +x /path/to/scripts/wifidetect

Finalmente, edite las entradas crontab para root usando el comando sudo crontab -e agregando la siguiente línea:

*/1 * * * * /path/to/scripts/wifidetect

He configurado el trabajo cron para cada minuto, pero puede cambiarlo como desee o como crea que es mejor. Consulte http://en.wikipedia.org/wiki/Cron en este sentido.