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## How to make wpa_cli talk to wpa_supplicant in Ubuntu

On a stock Ubuntu 11.04 distribution, wpa_cli can not talk to wpa_supplicant. Regardless of the options used, wpa_cli will always report:

Could not connect to wpa_supplicant - re-trying


That’s because wpa_cli expects to talk to wpa_supplicant over a control socket, but the default wpa_supplicant command line options don’t create a control socket (only the D-Bus interface is activated).

The fix is fairly easy. Modify the following file:

/usr/share/dbus-1/system-services/fi.epitest.hostap.WPASupplicant.service


and pass the -O option to wpa_supplicant by replacing the

Exec=/sbin/wpa_supplicant -u -s


line with

Exec=/sbin/wpa_supplicant -u -s -O /var/run/wpa_supplicant


Notice, that’s a capital-o, not a zero in the command line.

Restart the supplicant with: sudo killall wpa_supplicant and run ps auxww | grep wpa_supplicant to verify that the new options are being used.

If you notice that your changes are ignored, try making the same changes to:

/usr/share/dbus-1/system-services/fi.w1.wpa_supplicant1.service


You should now be able to run wpa_cli without any command line options (or with wpa_cli -p /var/run/wpa_supplicant) and talk to wpa_supplicant.

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1. May 22nd, 2012 at 08:48 | #1

Tried this with Sabayon but unfortunately made no difference :/

2. July 17th, 2012 at 16:40 | #2

Thanks for pointing that out. It did not work for me but you pointed me into the right direction.
I don’t know if it is a good idea to change that script. It might be overwritten by an update. So I looked into the wpa_supplicant config doc http://linux.die.net/man/8/wpa_supplicant and there it was:

-C ctrl_inter-C ctrl_interface
Path to ctrl_interface socket (Per interface. Only used if -c is not).

and you can put that in wpa_supplicant.conf:

ctrl_interface=/var/run/wpa_supplicant

(I run the wpa_gui as root, using Gentoo linux)

–Kees

3. July 23rd, 2012 at 08:53 | #3

not valid anymore since at least 12.04.
There already -O option present by default while wpa_cli still return that error

4. November 22nd, 2012 at 21:25 | #4

the version of wpa_supplicant installed on my system does not seem to support the “-O” flag
wpa_supplicant v0.6.10

is it possible I need to get an updated version to use this work around?

1. November 23rd, 2012 at 00:32 | #1