6wpa_supplicant無線網絡配置

目前可使用wireless-tools 或wpa_supplicant工具來配置無線網絡。請記住重要的一點是，對無線網絡的配置是全局性的，而非針對具體的接口。

   wpa_supplicant是一個較好的選擇，但缺點是它不支持全部的驅動。請瀏覽wpa_supplicant網站得到它所支持的驅動列表。另外，wpa_supplicant目前只能鏈接到那些你已經配置好ESSID的無線網絡，它可讓您鏈接到那些使用WPA的AP。wireless-tools支持幾乎全部的無線網卡和驅動，但它不能鏈接到那些只支持WPA的AP。

    通過編譯後的wpa_supplicant源程序能夠看到兩個主要的可執行工具：wpa_supplicant和wpa_cli。wpa_supplicant是核心程序，它和wpa_cli的關係就是服務和客戶端的關係：後臺運行wpa_supplicant，使用wpa_cli來搜索、設置、和鏈接網絡。

如何用wpa_supplicant使能一個wifi鏈接？

一、運行wpa_supplicant程序；

執行：/system/bin/wpa_supplicant -d -Dwext -iwlan0 -c/data/misc/wifi/wpa_supplicant.conf

其中：

-i<ifname> : 網絡接口名稱

-c<conf>: 配置文件名稱
-C<ctrl_intf>: 控制接口名稱
-D<driver>: 驅動類型名稱
-p<driver_param>: 驅動參數
-b<br_ifname>: 橋接口名稱

-d: 增長調試信息

/system/bin/wpa_supplicant ：是 wpa_supplicant可執行程序的 path；

二、運行命令行工具wpa_cli ；

執行 ：wpa_cli -iwlan0 -p/data/system/wpa_supplicant

注，-p/data/system/wpa_supplicant中的wpa_supplicant並非可執行程序，而是個控制套接字。

此時會進入交互模式。其中交互模式的命令以下表：

Full command	Short command	Description
status	stat	displays the current connection status
disconnect	disc	prevents wpa_supplicant from connecting to any access point
quit	q	exits wpa_cli
terminate	term	kills wpa_supplicant
reconfigure	recon	reloads wpa_supplicant with the configuration file supplied (-c parameter)
scan	scan	scans for available access points (only scans it, doesn't display anything)
scan_result	scan_r	displays the results of the last scan
list_networks	list_n	displays a list of configured networks and their status (active or not, enabled or disabled)
select_network	select_n	select a network among those defined to initiate a connection (ie select_network 0)
enable_network	enable_n	makes a configured network available for selection (ie enable_network 0)
disable_network	disable_n	makes a configured network unavailable for selection (ie disable_network 0)
remove_network	remove_n	removes a network and its configuration from the list (ie remove_network 0)
add_network	add_n	adds a new network to the list. Its id will be created automatically
set_network	set_n	shows a very short list of available options to configure a network when supplied with no parameters. See next section for a list of extremely useful parameters to be used with set_network and get_network.
get_network	get_n	displays the required parameter for the specified network. See next section for a list of parameters
save_config	save_c	saves the configuration

設置網絡的基本格式：set_network <network id> <key><parameter> [<parameter>]

顯示網絡信息的基本格式：get_network <network id> <key>

相應的參數以下表：

Key	Description	Parameters
ssid	Access point name	string
id_str	String identifying the network	string
priority	Connection priority over other APs	number (0 being the default low priority)
bssid	Mac address of the access point	mac address
scan_ssid	Enable/disbale ssid scan	0, 1, 2
key_mgmt	Type of key management	WPA-PSK, WPA_EAP, None
pairwise	Pairwise ciphers for WPA	CCMP, TKIP
group=TKIP	Group ciphers for WPA	CCMP, TKIP, WEP104, WEP40
psk	Pre-Shared Key (clear or encrypted)	string
wep_key0	WEP key (up to 4: wep_key[0123])	string
eap	Extensible Authentication Protocol	MD5, MSCHAPV2, OTP, GTC, TLS, PEAP, TTLS
identity	EAP identity string	string
password	EAP password	string
ca_cert	Pathname to CA certificate file	/full/path/to/certificate
client_cert	Pathname to client certificate	/full/path/to/certificate (PEM/DER)
private_key	Pathname to a client private key file	/full/path/to/private_key (PEM/DER/PFX)

eg.一、鏈接無加密的AP

>add_network  (It will display a network id for you, assume it returns 0)

>set_network 0 ssid "666"

>set_network 0 key_mgmt NONE

>enable_network 0

>quit

eg.二、鏈接WEP加密AP

>add_network   (assume return 1)

>set_network 1 ssid "666"

>set_network 1 key_mgmt NONE

>set_network 1 wep_key0 "your ap password"

>enable_network 1

eg.三、鏈接WPA-PSK/WPA2-PSK加密的AP

>add_network   (assume return 2)

>set_network 2 ssid "666"

>set_network 2psk "your pre-shared key"

>enable_network 2

到此，wifi模塊就能鏈接上AP了。

三、以上是經過命令行工具wpa_cli來實現wifi網絡的鏈接。固然，也能夠經過wpa_supplicant的配置文件來實現鏈接。

再回顧下運行wpa_supplicant時執行的命令：

/system/bin/wpa_supplicant -d -Dwext -iwlan0 -c/data/misc/wifi/wpa_supplicant.conf

咱們在執行時加上了-c/data/misc/wifi/wpa_supplicant.conf，咱們能夠將咱們要鏈接的AP的設置以必定的格式寫入wpa_supplicant.conf配置文件中便可。

例如： 

ctrl_interface=DIR=/data/system/wpa_supplicant GROUP=system update_config=1

network={

ssid="my access point"

proto=WPA

key_mgmt=WPA-PSK

psk="you pass words"

}