How to use netlink to determine wifi protection WEP

From: Thomas Thielemann <thomas@th-thielemann.de>
To: linux-wireless@vger.kernel.org
Subject: How to use netlink to determine wifi protection WEP
Date: Wed, 5 Apr 2017 09:27:03 +0200	[thread overview]
Message-ID: <163FFAFB-1BA3-42A1-9F84-0EAEDFEBE5AE@th-thielemann.de> (raw)

Hello!

I need a solution to determine whether a WiFi is using WEP. I know there is a protection flag within MAC frame but do not know how to access.

To detect whether a WiFi i protected by WPA2 I found the following solution: 

Scan with

nl_sock* socket = nl_socket_alloc();
genl_connect(socket);
struct nl_msg* msg = nlmsg_alloc();
int driverId = genl_ctrl_resolve(socket, "nl80211"); 
genlmsg_put(msg, 0, 0, driverId, 0, 0, NL80211_CMD_TRIGGER_SCAN, 0);

and fetch with

genlmsg_put(msg, 0, 0, driverId, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0);

Read the received structure using nl80211_bss:: NL80211_BSS_INFORMATION_ELEMENTS from nl80211.h and

examine the field RSN(id=48) (see IEEE802.11-2012.pdf, chapter 8.4.2 Information elements)

Which netlink command gives me the related data? Is it NL80211_CMD_GET_BEACON?

Regards,
Thomas

E-Mail: th-thielemann@web.de