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--
-- Copyright (c) 2002-2010, The University Court of the University of Glasgow.
-- Copyright (c) 2007-2010, Johan Tibell
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- - Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- - Redistributions in binary form must reproduce the above copyright notice,
-- this list of conditions and the following disclaimer in the documentation
-- and/or other materials provided with the distribution.
--
-- - Neither name of the University nor the names of its contributors may be
-- used to endorse or promote products derived from this software without
-- specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY COURT OF THE UNIVERSITY OF
-- GLASGOW AND THE CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
-- INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
-- FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-- UNIVERSITY COURT OF THE UNIVERSITY OF GLASGOW OR THE CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-- DAMAGE.
--
module Network.WireGuard.Foreign.In6Addr
( In6Addr(..)
) where
import Foreign
import Network.Socket.Internal
#include "uapi.h"
-- Extracted from network:Network/Socket/Types.hsc, with some modification.
-- The peek32 and poke32 functions work around the fact that the RFCs
-- don't require 32-bit-wide address fields to be present. We can
-- only portably rely on an 8-bit field, s6_addr.
s6_addr_offset :: Int
s6_addr_offset = (#offset struct in6_addr, s6_addr)
peek32 :: Ptr a -> Int -> IO Word32
peek32 p i0 = do
let i' = i0 * 4
peekByte n = peekByteOff p (s6_addr_offset + i' + n) :: IO Word8
a `sl` i = fromIntegral a `shiftL` i
a0 <- peekByte 0
a1 <- peekByte 1
a2 <- peekByte 2
a3 <- peekByte 3
return ((a0 `sl` 24) .|. (a1 `sl` 16) .|. (a2 `sl` 8) .|. (a3 `sl` 0))
poke32 :: Ptr a -> Int -> Word32 -> IO ()
poke32 p i0 a = do
let i' = i0 * 4
pokeByte n = pokeByteOff p (s6_addr_offset + i' + n)
x `sr` i = fromIntegral (x `shiftR` i) :: Word8
pokeByte 0 (a `sr` 24)
pokeByte 1 (a `sr` 16)
pokeByte 2 (a `sr` 8)
pokeByte 3 (a `sr` 0)
-- | Private newtype proxy for the Storable instance. To avoid orphan instances.
newtype In6Addr = In6Addr { fromIn6Addr :: HostAddress6 }
instance Storable In6Addr where
sizeOf _ = #const sizeof(struct in6_addr)
alignment _ = #alignment struct in6_addr
peek p = do
a <- peek32 p 0
b <- peek32 p 1
c <- peek32 p 2
d <- peek32 p 3
return $ In6Addr (a, b, c, d)
poke p (In6Addr (a, b, c, d)) = do
poke32 p 0 a
poke32 p 1 b
poke32 p 2 c
poke32 p 3 d
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