最近在調試無線軟AP軟件 hostapd 時遇到個錯誤，總是無法啟動服務。

調試輸出如下：[root@server?~]#?/usr/sbin/hostapd?/etc/hostapd/hostapd.conf?-d

……省略……

Could?not?set?interface?wlp2s0?flags?(UP):?Operation?not?possible?due?to?RF-kill

nl80211:?Failed?to?set?interface?up?after?switching?mode

……省略……

那 RF-kill 是什么呢？

這里是 rfkill 相關介紹：

好吧，先搜索 rfkill 相關的軟件包。yum?search?rfkill[root@server?~]#?yum?search?rfkill

已加載插件：fastestmirror,?remove-with-leaves

Loading?mirror?speeds?from?cached?hostfile

============================?N/S?matched:?fkill?============================

rfkill.x86_64?:?A?tool?for?enabling?and?disabling?wireless?devices

這里也可以看出 rfkill 是一個啟用/禁用無線設備的工具，也就是一個無線設備軟開關。

接下來安裝 rfkill 軟件包。yum?install?rfkill

看看 rfkill 有哪些文件。rpm?-ql?rfkill[root@server?~]#?rpm?-ql?rfkill

/sbin/rfkill

/usr/share/doc/rfkill

/usr/share/doc/rfkill/COPYING

/usr/share/doc/rfkill/README

/usr/share/man/man8/rfkill.8.gz

從輸出來看看來就主要一個可執(zhí)行文件 rfkill。

man rfkill 看看 rfkill 的用法。man?8?rfkill[root@server?~]#?man?8?rfkill

……簡要輸出……

rfkill?command

COMMANDS

help???Show?rfkill's?built-in?help?text.

event??Listen?for?rfkill?events?and?display?them?on?stdout.

list?[type]?????????????????????????????#查看設備狀態(tài)

List?the?current?state?of?all?available?rfkill-using?devices,

or?just?all?of?the?given?type.

block?index|type????????????????????????#關閉開關操作

Disable??the??device?corresponding?to?the?given?index.

type?is?one?of?"all",?"wifi",?"wlan",?"bluetooth",?"uwb",

"ultrawideband",?"wimax",?"wwan",?"gps",?"fm"?or?"nfc".

unblock?index|type??????????????????????#開啟開關操作

Enable?the?device?corresponding?to?the?given?index.

If?the?device?is?hard-blocked,?e.g.?via?a?hardware?switch,

it?will??remain??unavailable?though?it?is?now?soft-unblocked.

那么接下來就看看有沒有無線設備被關掉。rfkill?list[root@server?~]#?rfkill?list

0:?phy0:?Wireless?LAN

Soft?blocked:?yes??????????????#開關開啟，無線網卡無法使用

Hard?blocked:?no

解鎖操作rfkill?unblock?wlan[root@server?~]#?rfkill?unblock?wlan

再次查看rfkill?list[root@server?~]#?rfkill?list

0:?phy0:?Wireless?LAN

Soft?blocked:?no???????????????#此時已關閉，可以使用無線網卡

Hard?blocked:?no

再次運行調試模式/usr/sbin/hostapd?/etc/hostapd/hostapd.conf?-d

OK一切正常，那么就可以結束調試以正常模式啟動服務了。

總結

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