X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FIPv4Address.hs;h=b46f18c453ea967d19291810cd824a546975f5c9;hb=a6569af040d40db73dfd32677893916638c0d56a;hp=01bf36e63126ef51ebb8aae4aec301a8db97c43b;hpb=fbd4a98a9a0996d41e3715a2698114b8a061f2cd;p=hath.git diff --git a/src/IPv4Address.hs b/src/IPv4Address.hs index 01bf36e..b46f18c 100644 --- a/src/IPv4Address.hs +++ b/src/IPv4Address.hs @@ -1,211 +1,331 @@ module IPv4Address -( ipv4address_from_octets, - IPv4Address(None), - max_octet1, - max_octet2, - max_octet3, - max_octet4, - min_octet1, - min_octet2, - min_octet3, - min_octet4, - octet1, - octet2, - octet3, - octet4 -) - where +( ipv4address_tests, + IPv4Address(..), + max_address, + min_address, + most_sig_bit_different, +) where + +import Data.Maybe (fromJust) +import Test.HUnit +import Test.QuickCheck -import Bit +import Maskable import Maskbits import Octet -data IPv4Address = None | IPv4Address { octet1 :: Octet, - octet2 :: Octet, - octet3 :: Octet, - octet4 :: Octet } - deriving (Eq, Show) - - --- We don't export our constructor so this function is the only --- way to construct an address from octets. As a result, we can --- return IPv4Address.None in response to being passed one of more --- Octet.None octets. -ipv4address_from_octets :: Octet -> Octet -> Octet -> Octet -> IPv4Address -ipv4address_from_octets oct1 oct2 oct3 oct4 - | or [oct1 == Octet.None, - oct2 == Octet.None, - oct3 == Octet.None, - oct4 == Octet.None] = IPv4Address.None - | otherwise = IPv4Address oct1 oct2 oct3 oct4 - - -min_address :: IPv4Address -> Maskbits -> IPv4Address -min_address _ Maskbits.None = IPv4Address.None -min_address addr (Maskbits mask) - | mask == 32 = IPv4Address oct1 oct2 oct3 oct4 - | mask == 31 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 a30 a31 Zero) - | mask == 30 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 a30 Zero Zero) - | mask == 29 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 Zero Zero Zero) - | mask == 28 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 Zero Zero Zero Zero) - | mask == 27 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 Zero Zero Zero Zero Zero) - | mask == 26 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 Zero Zero Zero Zero Zero Zero) - | mask == 25 = IPv4Address oct1 oct2 oct3 (Octet a25 Zero Zero Zero Zero Zero Zero Zero) - | mask == 24 = IPv4Address oct1 oct2 oct3 (min_octet) - | mask == 23 = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 a23 Zero) (min_octet) - | mask == 22 = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 Zero Zero) (min_octet) - | mask == 21 = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 Zero Zero Zero) (min_octet) - | mask == 20 = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 Zero Zero Zero Zero) (min_octet) - | mask == 19 = IPv4Address oct1 oct2 (Octet a17 a18 a19 Zero Zero Zero Zero Zero) (min_octet) - | mask == 18 = IPv4Address oct1 oct2 (Octet a17 a18 Zero Zero Zero Zero Zero Zero) (min_octet) - | mask == 17 = IPv4Address oct1 oct2 (Octet a17 Zero Zero Zero Zero Zero Zero Zero) (min_octet) - | mask == 16 = IPv4Address oct1 oct2 (min_octet) (min_octet) - | mask == 15 = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 a14 a15 Zero) (min_octet) (min_octet) - | mask == 14 = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 a14 Zero Zero) (min_octet) (min_octet) - | mask == 13 = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 Zero Zero Zero) (min_octet) (min_octet) - | mask == 12 = IPv4Address oct1 (Octet a9 a10 a11 a12 Zero Zero Zero Zero) (min_octet) (min_octet) - | mask == 11 = IPv4Address oct1 (Octet a9 a10 a11 Zero Zero Zero Zero Zero) (min_octet) (min_octet) - | mask == 10 = IPv4Address oct1 (Octet a9 a10 Zero Zero Zero Zero Zero Zero) (min_octet) (min_octet) - | mask == 9 = IPv4Address oct1 (Octet a9 Zero Zero Zero Zero Zero Zero Zero) (min_octet) (min_octet) - | mask == 8 = IPv4Address oct1 (min_octet) (min_octet) (min_octet) - | mask == 7 = IPv4Address (Octet a1 a2 a3 a4 a5 a6 a7 Zero) (min_octet) (min_octet) (min_octet) - | mask == 6 = IPv4Address (Octet a1 a2 a3 a4 a5 a6 Zero Zero) (min_octet) (min_octet) (min_octet) - | mask == 5 = IPv4Address (Octet a1 a2 a3 a4 a5 Zero Zero Zero) (min_octet) (min_octet) (min_octet) - | mask == 4 = IPv4Address (Octet a1 a2 a3 a4 Zero Zero Zero Zero) (min_octet) (min_octet) (min_octet) - | mask == 3 = IPv4Address (Octet a1 a2 a3 Zero Zero Zero Zero Zero) (min_octet) (min_octet) (min_octet) - | mask == 2 = IPv4Address (Octet a1 a2 Zero Zero Zero Zero Zero Zero) (min_octet) (min_octet) (min_octet) - | mask == 1 = IPv4Address (Octet a1 Zero Zero Zero Zero Zero Zero Zero) (min_octet) (min_octet) (min_octet) - | mask == 0 = IPv4Address (min_octet) (min_octet) (min_octet) (min_octet) - | otherwise = addr - where - a1 = (b1 oct1) - a2 = (b2 oct1) - a3 = (b3 oct1) - a4 = (b4 oct1) - a5 = (b5 oct1) - a6 = (b6 oct1) - a7 = (b7 oct1) - a9 = (b1 oct2) - a10 = (b2 oct2) - a11 = (b3 oct2) - a12 = (b4 oct2) - a13 = (b5 oct2) - a14 = (b6 oct2) - a15 = (b7 oct2) - a17 = (b1 oct3) - a18 = (b2 oct3) - a19 = (b3 oct3) - a20 = (b4 oct3) - a21 = (b5 oct3) - a22 = (b6 oct3) - a23 = (b7 oct3) - a25 = (b1 oct4) - a26 = (b2 oct4) - a27 = (b3 oct4) - a28 = (b4 oct4) - a29 = (b5 oct4) - a30 = (b6 oct4) - a31 = (b7 oct4) - oct1 = (octet1 addr) - oct2 = (octet2 addr) - oct3 = (octet3 addr) - oct4 = (octet4 addr) - - - -max_address :: IPv4Address -> Maskbits -> IPv4Address -max_address _ Maskbits.None = IPv4Address.None -max_address addr (Maskbits mask) - | mask == 32 = IPv4Address oct1 oct2 oct3 oct4 - | mask == 31 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 a30 a31 One) - | mask == 30 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 a30 One One) - | mask == 29 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 One One One) - | mask == 28 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 One One One One) - | mask == 27 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 One One One One One) - | mask == 26 = IPv4Address oct1 oct2 oct3 (Octet a25 a26 One One One One One One) - | mask == 25 = IPv4Address oct1 oct2 oct3 (Octet a25 One One One One One One One) - | mask == 24 = IPv4Address oct1 oct2 oct3 (max_octet) - | mask == 23 = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 a23 One) (max_octet) - | mask == 22 = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 One One) (max_octet) - | mask == 21 = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 One One One) (max_octet) - | mask == 20 = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 One One One One) (max_octet) - | mask == 19 = IPv4Address oct1 oct2 (Octet a17 a18 a19 One One One One One) (max_octet) - | mask == 18 = IPv4Address oct1 oct2 (Octet a17 a18 One One One One One One) (max_octet) - | mask == 17 = IPv4Address oct1 oct2 (Octet a17 One One One One One One One) (max_octet) - | mask == 16 = IPv4Address oct1 oct2 (max_octet) (max_octet) - | mask == 15 = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 a14 a15 One) (max_octet) (max_octet) - | mask == 14 = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 a14 One One) (max_octet) (max_octet) - | mask == 13 = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 One One One) (max_octet) (max_octet) - | mask == 12 = IPv4Address oct1 (Octet a9 a10 a11 a12 One One One One) (max_octet) (max_octet) - | mask == 11 = IPv4Address oct1 (Octet a9 a10 a11 One One One One One) (max_octet) (max_octet) - | mask == 10 = IPv4Address oct1 (Octet a9 a10 One One One One One One) (max_octet) (max_octet) - | mask == 9 = IPv4Address oct1 (Octet a9 One One One One One One One) (max_octet) (max_octet) - | mask == 8 = IPv4Address oct1 (max_octet) (max_octet) (max_octet) - | mask == 7 = IPv4Address (Octet a1 a2 a3 a4 a5 a6 a7 One) (max_octet) (max_octet) (max_octet) - | mask == 6 = IPv4Address (Octet a1 a2 a3 a4 a5 a6 One One) (max_octet) (max_octet) (max_octet) - | mask == 5 = IPv4Address (Octet a1 a2 a3 a4 a5 One One One) (max_octet) (max_octet) (max_octet) - | mask == 4 = IPv4Address (Octet a1 a2 a3 a4 One One One One) (max_octet) (max_octet) (max_octet) - | mask == 3 = IPv4Address (Octet a1 a2 a3 One One One One One) (max_octet) (max_octet) (max_octet) - | mask == 2 = IPv4Address (Octet a1 a2 One One One One One One) (max_octet) (max_octet) (max_octet) - | mask == 1 = IPv4Address (Octet a1 One One One One One One One) (max_octet) (max_octet) (max_octet) - | mask == 0 = IPv4Address (max_octet) (max_octet) (max_octet) (max_octet) - | otherwise = addr - where - a1 = (b1 oct1) - a2 = (b2 oct1) - a3 = (b3 oct1) - a4 = (b4 oct1) - a5 = (b5 oct1) - a6 = (b6 oct1) - a7 = (b7 oct1) - a9 = (b1 oct2) - a10 = (b2 oct2) - a11 = (b3 oct2) - a12 = (b4 oct2) - a13 = (b5 oct2) - a14 = (b6 oct2) - a15 = (b7 oct2) - a17 = (b1 oct3) - a18 = (b2 oct3) - a19 = (b3 oct3) - a20 = (b4 oct3) - a21 = (b5 oct3) - a22 = (b6 oct3) - a23 = (b7 oct3) - a25 = (b1 oct4) - a26 = (b2 oct4) - a27 = (b3 oct4) - a28 = (b4 oct4) - a29 = (b5 oct4) - a30 = (b6 oct4) - a31 = (b7 oct4) - oct1 = (octet1 addr) - oct2 = (octet2 addr) - oct3 = (octet3 addr) - oct4 = (octet4 addr) - - - -min_octet1 :: IPv4Address -> Maskbits -> Octet -min_octet1 addr mask = octet1 (min_address addr mask) - -min_octet2 :: IPv4Address -> Maskbits -> Octet -min_octet2 addr mask = octet2 (min_address addr mask) - -min_octet3 :: IPv4Address -> Maskbits -> Octet -min_octet3 addr mask = octet3 (min_address addr mask) - -min_octet4 :: IPv4Address -> Maskbits -> Octet -min_octet4 addr mask = octet4 (min_address addr mask) - -max_octet1 :: IPv4Address -> Maskbits -> Octet -max_octet1 addr mask = octet1 (max_address addr mask) - -max_octet2 :: IPv4Address -> Maskbits -> Octet -max_octet2 addr mask = octet2 (max_address addr mask) - -max_octet3 :: IPv4Address -> Maskbits -> Octet -max_octet3 addr mask = octet3 (max_address addr mask) - -max_octet4 :: IPv4Address -> Maskbits -> Octet -max_octet4 addr mask = octet4 (max_address addr mask) +data IPv4Address = + IPv4Address { octet1 :: Octet, + octet2 :: Octet, + octet3 :: Octet, + octet4 :: Octet } + deriving (Eq) + + +instance Show IPv4Address where + show addr = concat [(show oct1) ++ ".", + (show oct2) ++ ".", + (show oct3) ++ ".", + (show oct4)] + where + oct1 = (octet1 addr) + oct2 = (octet2 addr) + oct3 = (octet3 addr) + oct4 = (octet4 addr) + + +instance Arbitrary IPv4Address where + arbitrary = do + oct1 <- arbitrary :: Gen Octet + oct2 <- arbitrary :: Gen Octet + oct3 <- arbitrary :: Gen Octet + oct4 <- arbitrary :: Gen Octet + return (IPv4Address oct1 oct2 oct3 oct4) + + + +instance Maskable IPv4Address where + + apply_mask addr mask bit = + apply_mask' mask + where + oct1 = octet1 addr + oct2 = octet2 addr + oct3 = octet3 addr + oct4 = octet4 addr + + -- A copy of 'addr' with the fourth octet zeroed (or oned). + new_addr1 = addr { octet4 = (apply_mask oct4 Zero bit) } + + -- Likewise for new_addr1's third octet. + new_addr2 = new_addr1 { octet3 = (apply_mask oct3 Zero bit) } + + -- And new_addr2's second octet. + new_addr3 = new_addr2 { octet2 = (apply_mask oct2 Zero bit) } + + -- This helper function allows us to pattern-match cleanly. + apply_mask' :: Maskbits -> IPv4Address + + apply_mask' ThirtyTwo = addr + + apply_mask' ThirtyOne = addr { octet4 = (apply_mask oct4 Seven bit) } + + apply_mask' Thirty = + addr { octet4 = (apply_mask oct4 Six bit) } + + apply_mask' TwentyNine = + addr { octet4 = (apply_mask oct4 Five bit) } + + apply_mask' TwentyEight = + addr { octet4 = (apply_mask oct4 Four bit) } + + apply_mask' TwentySeven = + addr { octet4 = (apply_mask oct4 Three bit) } + + apply_mask' TwentySix = + addr { octet4 = (apply_mask oct4 Two bit) } + + apply_mask' TwentyFive = + addr { octet4 = (apply_mask oct4 One bit) } + + apply_mask' TwentyFour = new_addr1 + + apply_mask' TwentyThree = + new_addr1 { octet3 = (apply_mask oct3 Seven bit) } + + apply_mask' TwentyTwo = + new_addr1 { octet3 = (apply_mask oct3 Six bit) } + + apply_mask' TwentyOne = + new_addr1 { octet3 = (apply_mask oct3 Five bit) } + + apply_mask' Twenty = + new_addr1 { octet3 = (apply_mask oct3 Four bit) } + + apply_mask' Nineteen = + new_addr1 { octet3 = (apply_mask oct3 Three bit) } + + apply_mask' Eighteen = + new_addr1 { octet3 = (apply_mask oct3 Two bit) } + + apply_mask' Seventeen = + new_addr1 { octet3 = (apply_mask oct3 One bit) } + + apply_mask' Sixteen = + new_addr2 + + apply_mask' Fifteen = + new_addr2 { octet2 = (apply_mask oct2 Seven bit) } + + apply_mask' Fourteen = + new_addr2 { octet2 = (apply_mask oct2 Six bit) } + + apply_mask' Thirteen = + new_addr2 { octet2 = (apply_mask oct2 Five bit) } + + apply_mask' Twelve = + new_addr2 { octet2 = (apply_mask oct2 Four bit) } + + apply_mask' Eleven = + new_addr2 { octet2 = (apply_mask oct2 Three bit) } + + apply_mask' Ten = + new_addr2 { octet2 = (apply_mask oct2 Two bit) } + + apply_mask' Nine = + new_addr2 { octet2 = (apply_mask oct2 One bit) } + + apply_mask' Eight = + new_addr3 { octet2 = (apply_mask oct2 Zero bit) } + + apply_mask' Seven = + new_addr3 { octet1 = (apply_mask oct1 Seven bit) } + + apply_mask' Six = + new_addr3 { octet1 = (apply_mask oct1 Six bit) } + + apply_mask' Five = + new_addr3 { octet1 = (apply_mask oct1 Five bit) } + + apply_mask' Four = + new_addr3 { octet1 = (apply_mask oct1 Four bit) } + + apply_mask' Three = + new_addr3 { octet1 = (apply_mask oct1 Three bit) } + + apply_mask' Two = + new_addr3 { octet1 = (apply_mask oct1 Two bit) } + + apply_mask' One = + new_addr3 { octet1 = (apply_mask oct1 One bit) } + + apply_mask' Zero = + new_addr3 { octet1 = (apply_mask oct1 Zero bit) } + + + +-- | The minimum possible IPv4 address, 0.0.0.0. +min_address :: IPv4Address +min_address = + IPv4Address min_octet min_octet min_octet min_octet + + +-- | The maximum possible IPv4 address, 255.255.255.255. +max_address :: IPv4Address +max_address = + IPv4Address max_octet max_octet max_octet max_octet + + +-- | Given two addresses, find the number of the most significant bit +-- where they differ. If the addresses are the same, return +-- Maskbits.Zero. +most_sig_bit_different :: IPv4Address -> IPv4Address -> Maskbits +most_sig_bit_different addr1 addr2 + | addr1 == addr2 = Maskbits.Zero + | m1 /= n1 = Maskbits.One + | m2 /= n2 = Two + | m3 /= n3 = Three + | m4 /= n4 = Four + | m5 /= n5 = Five + | m6 /= n6 = Six + | m7 /= n7 = Seven + | m8 /= n8 = Eight + | m9 /= n9 = Nine + | m10 /= n10 = Ten + | m11 /= n11 = Eleven + | m12 /= n12 = Twelve + | m13 /= n13 = Thirteen + | m14 /= n14 = Fourteen + | m15 /= n15 = Fifteen + | m16 /= n16 = Sixteen + | m17 /= n17 = Seventeen + | m18 /= n18 = Eighteen + | m19 /= n19 = Nineteen + | m20 /= n20 = Twenty + | m21 /= n21 = TwentyOne + | m22 /= n22 = TwentyTwo + | m23 /= n23 = TwentyThree + | m24 /= n24 = TwentyFour + | m25 /= n25 = TwentyFive + | m26 /= n26 = TwentySix + | m27 /= n27 = TwentySeven + | m28 /= n28 = TwentyEight + | m29 /= n29 = TwentyNine + | m30 /= n30 = Thirty + | m31 /= n31 = ThirtyOne + | m32 /= n32 = ThirtyTwo + | otherwise = Maskbits.Zero + where + m1 = (b1 oct1a) + m2 = (b2 oct1a) + m3 = (b3 oct1a) + m4 = (b4 oct1a) + m5 = (b5 oct1a) + m6 = (b6 oct1a) + m7 = (b7 oct1a) + m8 = (b8 oct1a) + m9 = (b1 oct2a) + m10 = (b2 oct2a) + m11 = (b3 oct2a) + m12 = (b4 oct2a) + m13 = (b5 oct2a) + m14 = (b6 oct2a) + m15 = (b7 oct2a) + m16 = (b8 oct2a) + m17 = (b1 oct3a) + m18 = (b2 oct3a) + m19 = (b3 oct3a) + m20 = (b4 oct3a) + m21 = (b5 oct3a) + m22 = (b6 oct3a) + m23 = (b7 oct3a) + m24 = (b8 oct3a) + m25 = (b1 oct4a) + m26 = (b2 oct4a) + m27 = (b3 oct4a) + m28 = (b4 oct4a) + m29 = (b5 oct4a) + m30 = (b6 oct4a) + m31 = (b7 oct4a) + m32 = (b8 oct4a) + oct1a = (octet1 addr1) + oct2a = (octet2 addr1) + oct3a = (octet3 addr1) + oct4a = (octet4 addr1) + n1 = (b1 oct1b) + n2 = (b2 oct1b) + n3 = (b3 oct1b) + n4 = (b4 oct1b) + n5 = (b5 oct1b) + n6 = (b6 oct1b) + n7 = (b7 oct1b) + n8 = (b8 oct1b) + n9 = (b1 oct2b) + n10 = (b2 oct2b) + n11 = (b3 oct2b) + n12 = (b4 oct2b) + n13 = (b5 oct2b) + n14 = (b6 oct2b) + n15 = (b7 oct2b) + n16 = (b8 oct2b) + n17 = (b1 oct3b) + n18 = (b2 oct3b) + n19 = (b3 oct3b) + n20 = (b4 oct3b) + n21 = (b5 oct3b) + n22 = (b6 oct3b) + n23 = (b7 oct3b) + n24 = (b8 oct3b) + n25 = (b1 oct4b) + n26 = (b2 oct4b) + n27 = (b3 oct4b) + n28 = (b4 oct4b) + n29 = (b5 oct4b) + n30 = (b6 oct4b) + n31 = (b7 oct4b) + n32 = (b8 oct4b) + oct1b = (octet1 addr2) + oct2b = (octet2 addr2) + oct3b = (octet3 addr2) + oct4b = (octet4 addr2) + + + +-- HUnit Tests +mk_testaddr :: Int -> Int -> Int -> Int -> IPv4Address +mk_testaddr a b c d = + IPv4Address oct1 oct2 oct3 oct4 + where + oct1 = fromJust $ octet_from_int a + oct2 = fromJust $ octet_from_int b + oct3 = fromJust $ octet_from_int c + oct4 = fromJust $ octet_from_int d + + +test_most_sig_bit_different1 :: Test +test_most_sig_bit_different1 = + TestCase $ assertEqual "10.1.1.0 and 10.1.0.0 differ in bit 24" + TwentyFour + bit + where + addr1 = mk_testaddr 10 1 1 0 + addr2 = (mk_testaddr 10 1 0 0) + bit = most_sig_bit_different addr1 addr2 + + + +test_most_sig_bit_different2 :: Test +test_most_sig_bit_different2 = + TestCase $ assertEqual "10.1.2.0 and 10.1.1.0 differ in bit 23" + TwentyThree + bit + where + addr1 = mk_testaddr 10 1 2 0 + addr2 = mk_testaddr 10 1 1 0 + bit = most_sig_bit_different addr1 addr2 + + +ipv4address_tests :: [Test] +ipv4address_tests = + [ test_most_sig_bit_different1, + test_most_sig_bit_different2 ]