wpa_supplicant无线网络配置
From:? http://blog.163.com/wxiongn@126/blog/static/11788203820102262748358/
??? 目前可以使用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，但缺點是它不支持所有的驅動。請瀏覽wpa_supplicant網站獲得它所支持的驅動列表。另外，wpa_supplicant目前只能連接到那些你已經配置好ESSID的無線網絡。wireless-tools支持幾乎所有的無線網卡和驅動，但它不能連接到那些只支持WPA的AP。
?? ?經過編譯后的wpa_supplicant源程序可以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的關系就是服務和客戶端的關系：后臺運行wpa_supplicant，使用wpa_cli來搜索、設置、和連接網絡。
?? ? ? 如何用wpa_supplicant使能一個wifi連接？
Step by step：
1、運行wpa_supplicant程序；
執行：/system/bin/wpa_supplicant -d -Dwext -iwlan0 -c/data/misc/wifi/wpa_supplicant.conf
其中：
-d ：增加調試信息
-Dwext ：wext，驅動名稱
-iwlan0 ：wlan0，網絡接口名稱
/system/bin/wpa_supplicant ：wpa_supplicant可執行程序path
/data/misc/wifi/wpa_supplicant.conf ：wpa_supplicant的配置文件path
2、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并不是可執行程序，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如下表：
| 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>
相應的參數如下表：
| 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.1、連接無加密的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.2、連接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.3、連接WPA-PSK/WPA2-PSK加密的AP
>add_network ? (assume return 2)
>set_network 2 ssid "666"
>set_network 2 psk "your pre-shared key"
>enable_network 2
到此，wifi模塊就能連接上AP了。
3、以上是通過命令行工具wpa_cli來實現wifi網絡的連接。當然，也可以通過wpa_supplicant的配置文件來實現連接。
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
我們在執行時加上了-c/data/misc/wifi/wpa_supplicant.conf，我們可以將我們要連接的AP的設置以一定的格式寫入wpa_supplicant.conf配置文件中即可。
eg.?
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"
}
具體格式可參考：http://hostap.epitest.fi/gitweb/gitweb.cgi?p=hostap.git;a=blob_plain;f=wpa_supplicant/wpa_supplicant.conf
總結
以上是生活随笔為你收集整理的wpa_supplicant无线网络配置的全部內容，希望文章能夠幫你解決所遇到的問題。
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