飞凌嵌入式ElfBoard-Shell编程应用实例-使用WiFi拨号上网

#!/bin/sh

cnt1=`ps aux | grep hostapd | grep -v grep | wc -l`

#计算正在运行的 hostapd 进程的数量

if [ "$cnt1" != "0" ];then

killall hostapd > /dev/null

fi

#如果 hostapd 进程的数量不为零（即有进程在运行），则停止所有 hostapd 进程

ifconfig uap0 down

function usage()

{

echo "Usage: -i <wifi> -s <ssid> -p <password>"

echo "eg: ./wifi.sh -i mlan0 -s elf -p NONE "

echo " -i : mlan0 or mlan1"

echo " -s : wifi ssid"

echo " -p : wifi password or NONE"

}

function parse_args()

{

while true; do

case "$1" in

-i ) wifi=$2;echo wifi $wifi;shift 2 ;;

-s ) ssid=$2;echo ssid $ssid;shift 2 ;;

-p ) pasw=$2;echo pasw $pasw;shift 2 ;;

-h ) usage; exit 1 ;;

* ) break ;;

esac

done

}

#定义一个函数 parse_args，用于解析传入的命令行参数，并根据参数设置对应的变量

if [ $# != 6 ]

then

usage;

exit 1;

fi

#检查传入的参数数量是否为6（包括脚本名称在内）。如果不是，则输出使用说明并退出

parse_args $@

#调用 parse_args 函数来解析命令行参数

if [ -e /etc/wpa_supplicant.conf ]

then

rm /etc/wpa_supplicant.conf

fi

#如果 /etc/wpa_supplicant.conf 文件存在，则删除它

echo \#PSK/TKIP >> /etc/wpa_supplicant.conf

echo ctrl_interface=/var/run/wpa_supplicant >>/etc/wpa_supplicant.conf

echo ctrl_interface_group=0 >>/etc/wpa_supplicant.conf

echo update_config=1 >>/etc/wpa_supplicant.conf

echo network={ >>/etc/wpa_supplicant.conf

echo ssid=\"$ssid\" >>/etc/wpa_supplicant.conf

echo scan_ssid=1 >>/etc/wpa_supplicant.conf

if [ $pasw == NONE ]

then

echo key_mgmt=NONE >>/etc/wpa_supplicant.conf

else

echo psk=\"$pasw\" >>/etc/wpa_supplicant.conf

echo key_mgmt=WPA-EAP WPA-PSK IEEE8021X NONE >>/etc/wpa_supplicant.conf

echo group=CCMP TKIP WEP104 WEP40 >>/etc/wpa_supplicant.conf

fi

echo } >>/etc/wpa_supplicant.conf

#创建新的 /etc/wpa_supplicant.conf 配置文件，配置文件包括网络的基本设置、SSID 和#密码等

ifconfig -a|grep mlan0 |grep -v grep > /dev/null

if [ $? -eq 0 ]

then

ifconfig mlan0 down > /dev/null

fi

#检查 mlan0 网络接口是否存在，如果存在，则关闭它

ifconfig -a|grep mlan1 |grep -v grep > /dev/null

if [ $? -eq 0 ]

then

ifconfig mlan1 down > /dev/null

fi

ifconfig -a|grep eth0 |grep -v grep > /dev/null

if [ $? -eq 0 ]

then

ifconfig eth0 down > /dev/null

fi

ifconfig -a|grep eth1 |grep -v grep > /dev/null

if [ $? -eq 0 ]

then

ifconfig eth1 down > /dev/null

fi

ifconfig -a|grep usb0 |grep -v grep > /dev/null

if [ $? -eq 0 ]

then

ifconfig usb0 down > /dev/null

fi

ps -fe|grep wpa_supplicant |grep -v grep > /dev/null

if [ $? -eq 0 ]

then

kill -9 $(pidof wpa_supplicant)

fi

#查找是否有wpa_supplicant进程运行，如果有则kill掉

sleep 1

ifconfig $wifi up > /dev/null

sleep 1

#启动$wifi接口

(wpa_supplicant -Dnl80211,wext -i$wifi -c/etc/wpa_supplicant.conf >/dev/null) &

echo "waiting..."

sleep 3

wpa_cli -i$wifi status |grep COMPLETED |grep -v grep >/dev/null

if [ $? -eq 0 ]

then

udhcpc -i $wifi

echo "Finshed!"

else

echo "try to connect again..."

sleep 3

wpa_cli -i$wifi status |grep COMPLETED |grep -v grep >/dev/null

if [ $? -eq 0 ]

then

udhcpc -i $wifi

echo "nameserver 114.114.114.114" > /etc/resolv.conf

echo "Finshed!"

else

echo "************************************************"

echo "connect faild,please check the passward and ssid"

kill -9 $(pidof wpa_supplicant)

exit 1

fi

fi

#尝试连接Wi-Fi网络并获取IP地址，若失败则重新尝试，最终若连接仍失败则输出错误#信息并终止wpa_supplicant进程

root@ELF2:~#chmod 777 wifi.sh

root@ELF2:~#./wifi.sh -i 8723 -s p50 -p xx000628