linux下使用wifi

一、无线网卡已经up。

rfkill list all

rfkill unblock wifi

二、wpa_supplicant -u配合networkmanager

systemctl start wpa_supplicant

三、wpa_supplicant指定网卡

配置/etc/wpa_supplicant/wpa_supplicant-wlan0.conf

ctrl_interface=/run/wpa_supplicant
update_config=1
network={
       ssid="Oak"
       psk="password"
       key_mgmt=WPA-PSK
}
执行systemctl start wpa_supplicant@wlan0.service后启动后台进程

/usr/bin/wpa_supplicant -c/etc/wpa_supplicant/wpa_supplicant-wlan0.conf -iwlan0

再使用dhcpcd wlan0得到地址，为了实现启动时自动dhcp分配地址，可使 用dhcpcd@service。对于systemd-networkd管理的网络也能够在/etc/systemd/network目录下建文件wlan0.network实现dhcp。

[Match]
Name=wlan0
[Network]
DHCP=yes

四、wpa_supplicant控制接口与wpa_cli

wpa_supplicant -i wlan0 -u -s -O /var/run/wpa_supplicant

(其它参数：

-d调试

-Dwext 驱动

-c /etc/wpa_supplicant.conf配置文件)

wpa_cli使用

wpa_cli -iwlan0 -p /var/run/wpa_supplicant

1)scan

2)scan_results

3)链接无加密的AP
>add_network  (It will display a network id for you, assume it returns 0)
>set_network 0 ssid "parrot"
>set_network 0 key_mgmt NONE
>enable_network 0
>quit
4)链接WEP加密AP
>add_network   (assume return 1)
>set_network 1 ssid "parrot"
>set_network 1 key_mgmt NONE
>set_network 1 wep_key0 "your ap password"
>enable_network 1
5)链接WPA-PSK/WPA2-PSK加密的AP
>add_network   (assume return 2)
>set_network 2 ssid "parrot"
>set_network 2 psk "your pre-shared key"
>enable_network 2

6)list_networks

四、配置文件内容

ctrl_interface=DIR=/var/run/wpa_supplicant

GROUP=system

update_config=1
network={
ssid="parrot"

scan_ssid=1
proto=WPA
key_mgmt=WPA-PSK
#psk="parrot111"

psk=b074643a1c8018d16a9a6d875d21dd6e31ebbc718cf63e7b26756889bfed0a79
}

能够用wpa_passphase parror parrot111自动生成。