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|
-----------------------------------------------------------------------------
-- |
-- Module : IWlib
-- Copyright : (c) Jose A Ortega Ruiz
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- A partial binding to iwlib
--
-----------------------------------------------------------------------------
{-# LANGUAGE CPP, ForeignFunctionInterface, EmptyDataDecls #-}
module IWlib (WirelessInfo(..), getWirelessInfo) where
import Foreign
import Foreign.C.Types
import Foreign.C.String
data WirelessInfo = WirelessInfo { wiEssid :: String, wiQuality :: Int }
deriving Show
#include <iwlib.h>
data WCfg
data WStats
data WRange
foreign import ccall "iwlib.h iw_sockets_open"
c_iw_open :: IO CInt
foreign import ccall "unistd.h close"
c_iw_close :: CInt -> IO ()
foreign import ccall "iwlib.h iw_get_basic_config"
c_iw_basic_config :: CInt -> CString -> Ptr WCfg -> IO CInt
foreign import ccall "iwlib.h iw_get_stats"
c_iw_stats :: CInt -> CString -> Ptr WStats -> Ptr WRange -> CInt -> IO CInt
foreign import ccall "iwlib.h iw_get_range_info"
c_iw_range :: CInt -> CString -> Ptr WRange -> IO CInt
getWirelessInfo :: String -> IO WirelessInfo
getWirelessInfo iface =
allocaBytes (#size struct wireless_config) $ \wc ->
allocaBytes (#size struct iw_statistics) $ \stats ->
allocaBytes (#size struct iw_range) $ \rng ->
withCString iface $ \istr -> do
i <- c_iw_open
bcr <- c_iw_basic_config i istr wc
str <- c_iw_stats i istr stats rng 1
rgr <- c_iw_range i istr rng
c_iw_close i
if (bcr < 0) then return nullInfo else
do hase <- (#peek struct wireless_config, has_essid) wc :: IO CInt
eon <- (#peek struct wireless_config, essid_on) wc :: IO CInt
essid <- if hase > 0 && eon > 0 then
do l <- (#peek struct wireless_config, essid_len) wc
let e = (#ptr struct wireless_config, essid) wc
peekCStringLen (e, fromIntegral (l :: CInt))
else return ""
q <- if str >= 0 && rgr >=0 then
do qualv <- xqual $ (#ptr struct iw_statistics, qual) stats
mv <- xqual $ (#ptr struct iw_range, max_qual) rng
let mxv = if mv > 0 then fromIntegral mv else 1
return $ fromIntegral qualv / mxv
else return (-1)
let qv = round (100 * (q :: Double))
return $ WirelessInfo { wiEssid = essid, wiQuality = min 100 qv }
where nullInfo = WirelessInfo { wiEssid = "", wiQuality = -1 }
xqual p = let qp = (#ptr struct iw_param, value) p in
(#peek struct iw_quality, qual) qp :: IO CChar
|
