检测到 wifi 网络时发出警报？

Question

当检测到 wifi（无线）网络时，有没有办法播放声音来提醒我？

Answer 1

问题是，据我所知，没有特定的程序/服务/守护程序来检查新的无线网络何时出现/消失在无线天线的范围内（实际上有airodump-ng，也许还有其他，但这有冲突与网络管理器）。

作为替代方案，您可以使用工具不时扫描 wifi 网络iwlist。

注意：在测试中iwlist工具可能只适用于 Atheros、Intel 或 Broadcom 卡。

话虽如此，下面的脚本可以做你想做的事（我把它命名为wifidetect）：

#!/bin/bash

#wifidetect - Alert when new wireless 

#Licensed under the standard MIT license:
#Copyright 2013 Radu R?deanu (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

注意：您必须在脚本中更改username您的用户名和wlan0无线网卡的接口名称；您可以使用“ls /sys/class/net”命令找到它。

不要忘记在终端中使用以下命令使脚本可执行：

chmod +x /path/to/scripts/wifidetect

最后，sudo crontab -e通过添加以下行，使用命令编辑 root 的 crontab 条目：

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

我已经为每一分钟设置了 cron 工作，但是您可以根据自己的意愿或认为更好的方式进行更改。从这个意义上说，请参阅http://en.wikipedia.org/wiki/Cron。