Linux WIFI 扫描

 启动wifi服务

1. connmanctl disable wifi
2. connmanctl enable wifi
3. ifconfig wlan0 down
4. ifconfig wlan0 up

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wpa_supplicant包含两个主要的可执行工具：wpa_supplicant和wpa_cli。

wpa_supplicant是核心程序，它和wpa_cli的关系就是服务和客户端的关系：后台运行wpa_supplicant，使用wpa_cli来搜索、设置、和连接网络。

大部分情况下编辑好配置文件，运行wpa_supplicant 就可以连通网络了，

创建一个  wpa_supplicant.conf

可以     

echo "update_config=1" > /tmp/ema_wpa_supplicant.conf
echo "ctrl_interface=/var/run/wpa_supplicant" >> /tmp/ema_wpa_supplicant.conf

1. vi /tmp/wpa_supplicant.conf

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1. ctrl_interface=/var/run/wpa_supplicant
2. update_config=1
5. 其中，update_config=1使能配置更改。

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 关闭  wpa_supplicant

 kill -9 `pgrep wpa_supplicant`

wpa_supplicant 命令如下

1. usage:
2. wpa_supplicant [-BddhKLqqtuvW] [-P<pid file>] [-g<global ctrl>] \
3. [-G<group>] \
4. -i<ifname> -c<config file> [-C<ctrl>] [-D<driver>] [-p<driver_param>] \
5. [-b<br_ifname>] [-e<entropy file>] [-f<debug file>] \
6. [-o<override driver>] [-O<override ctrl>] \
7. [-N -i<ifname> -c<conf> [-C<ctrl>] [-D<driver>] \
8. [-m<P2P Device config file>] \
9. [-p<driver_param>] [-b<br_ifname>] [-I<config file>] ...]
11. drivers:
12. nl80211 = Linux nl80211/cfg80211
13. wext = Linux wireless extensions (generic)
14. wired = Wired Ethernet driver
15. options:
16. -b = optional bridge interface name
17. -B = run daemon in the background
18. -c = Configuration file
19. -C = ctrl_interface parameter (only used if -c is not)
20. -d = increase debugging verbosity (-dd even more)
21. -D = driver name (can be multiple drivers: nl80211,wext)
22. -e = entropy file
23. -f = log output to debug file instead of stdout
24. -g = global ctrl_interface
25. -G = global ctrl_interface group
26. -h = show this help text
27. -i = interface name
28. -I = additional configuration file
29. -K = include keys (passwords, etc.) in debug output
30. -L = show license (BSD)
31. -m = Configuration file for the P2P Device interface
32. -M = start describing new matching interface
33. -N = start describing new interface
34. -o = override driver parameter for new interfaces
35. -O = override ctrl_interface parameter for new interfaces
36. -p = driver parameters
37. -P = PID file
38. -q = decrease debugging verbosity (-qq even less)
39. -t = include timestamp in debug messages
40. -u = enable DBus control interface
41. -v = show version
42. -W = wait for a control interface monitor before starting
43. example:
44. wpa_supplicant -Dnl80211 -iwlan0 -c/etc/wpa_supplicant.conf

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 其中最常用的为：

-i 指定端口

-c 指定配置文件

-D 指定使用的wifi驱动

我们这里只指定端口和配置文件，驱动使用默认的。

 查看网卡端口 ifconfig

1. 使用以下命令配置
2. wpa_supplicant -i wlan0 -D nl80211 -c/tmp/ema_wpa_supplicant.conf -B

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1. wpa_cli -i wlan0 scan 扫描
3. sleep 10
5. wpa_cli -i wlan0 scan_results | grep "$2"

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 这样就测试WiFi成功