Openwrt操作無線介面有很多值得借鑑地方，如獲取dhcp列表，獲取無線列表，獲取連線流量等。而這一切依靠Lua


背景：需要通過iw獲取無線列表，並根據無線加密型別進行連線。參考openwrt原生介面：


1.安裝lua
官網預設映象居然沒有lua的支援，那麼安裝之：
opkg install luci
/etc/init.d/uhttpd start


2.lua目錄相關資訊;
/usr/lib/lua/luci/controller/  controller實現目錄
/usr/lib/lua/luci/model/cbi/admin_network/wifi_add.lua    這裡應該是操作iw的檔案


一些對應關係：
一番搜尋後發現此頁面的原始碼在系統的/usr/lib/lua/luci/view/admin_network/wifi_join.htm檔案裡，對應openwrt的原始碼路徑
為./feeds/luci/modules/admin-full/luasrc/view/admin_network/wifi_join.htm。






由local iw = luci.sys.wifi.getiwinfo(dev)找到sys.lua模組，路徑/usr/lib/lua/luci/sys.lua，對應openwrt原始碼位置./feeds/luci/modules/base/luasrc/sys.lua

[email protected]:/usr/lib/lua/luci# grep "scanlist" * -r
view/admin_network/wifi_join.htm:       function scanlist(times)
view/admin_network/wifi_join.htm:                       for k, v in ipairs(iw.scanlist or { }) do
view/admin_network/wifi_join.htm:                       <% for i, net in ipairs(scanlist(3)) do net.encryption = net.encryption or { } %>

[email protected]:/usr/lib/lua/luci#


[email protected]:/usr/lib/lua# grep "scanlist" * -r
iwinfo.so:scanlist


除錯思路：
https://my.oschina.net/osbin/blog/298526


目前openwrt具體實現：


function format_wifi_encryption(info)
if info.wep == true then
return "WEP"
elseif info.wpa > 0 then
return translatef("<abbr title='Pairwise: %s / Group: %s'>%s - %s</abbr>",
table.concat(info.pair_ciphers, ", "),
table.concat(info.group_ciphers, ", "),
(info.wpa == 3) and translate("mixed WPA/WPA2")
or (info.wpa == 2 and "WPA2" or "WPA"),
table.concat(info.auth_suites, ", ")
)
elseif info.enabled then
return "<em>%s</em>" % translate("unknown")
else
return "<em>%s</em>" % translate("open")
end
end


網友板：
#!/usr/bin/lua


dev = arg[1]
local sys = require "luci.sys"
local utl = require "luci.util"
local iw = luci.sys.wifi.getiwinfo(dev)


    function scanlist(times)
        local i, k, v
        local l = { }
        local s = { }


        for i = 1, times do
            for k, v in ipairs(iw.scanlist or { }) do
                if not s[v.bssid] then
                    l[#l+1] = v
                    s[v.bssid] = true
                end
            end
        end


        return l
    end


    function format_wifi_encryption(info)
        if info.wep == true then
            return "WEP"
        elseif info.wpa > 0 then
            return string.format("Pairwise: %s / Group: %s >%s - %s",
                table.concat(info.pair_ciphers, ", "),
                table.concat(info.group_ciphers, ", "),
                (info.wpa == 3) and string.format("mixed WPA/WPA2")
                    or (info.wpa == 2 and "WPA2" or "WPA"),
                table.concat(info.auth_suites, ", ")
            )
        elseif info.enabled then
            return unknown
        else
            return open
        end
    end




for i, net in ipairs(scanlist(3)) do
    net.encryption = net.encryption or { }
    print("channel:",net.channel);
    print("ssid:",net.ssid);
    print("bssid:",net.bssid);
    print("Mode:",net.mode);
    wep=net.encryption.wep and 1 or 0
    
    print("Encryption:",format_wifi_encryption(net.encryption));
    print("");
end