-- with the CIDR type.
module Cidr
( Cidr(..),
- cidr_from_string,
cidr_properties,
cidr_tests,
combine_all,
import Data.List (nubBy)
import Data.List.Split (splitOneOf)
-import Data.Maybe (catMaybes, fromJust, mapMaybe)
+import Data.Maybe (catMaybes, mapMaybe)
import Test.HUnit (assertEqual)
import Test.Framework (Test, testGroup)
import Test.QuickCheck (Arbitrary(..), Gen, Property, (==>))
import Text.Read (readMaybe)
-import qualified Bit as B
-import IPv4Address
-import Maskable
-import Maskbits
-import Octet
+import qualified Bit as B (Bit(..))
+import IPv4Address (IPv4Address(..), most_sig_bit_different)
+import Maskable (Maskable(..))
+import Maskbits (Maskbits(..))
+import Octet (Octet(..))
data Cidr = Cidr { ipv4address :: IPv4Address,
maskbits :: Maskbits }
-
instance Show Cidr where
show cidr = (show (ipv4address cidr)) ++ "/" ++ (show (maskbits cidr))
-- after the trailing slash.
maskbits_from_cidr_string :: String -> Maybe Maskbits
maskbits_from_cidr_string s
- | length partlist == 2 = maskbits_from_string (partlist !! 1)
+ | length partlist == 2 = readMaybe (partlist !! 1)
| otherwise = Nothing
where
partlist = splitOneOf "/" s
-- of its octets (as Ints).
octets_from_cidr_string :: String -> [Octet]
octets_from_cidr_string s =
- mapMaybe readMaybe (take 4 (splitOneOf "./" s))
-
-
--- | Return Nothing if we can't parse both maskbits and octets from
--- the string.
-cidr_from_string :: String -> Maybe Cidr
-cidr_from_string s =
- case (octets_from_cidr_string s) of
- [oct1, oct2, oct3, oct4] ->
- case (maskbits_from_cidr_string s) of
- Just mbits ->
- Just $ Cidr (IPv4Address oct1 oct2 oct3 oct4) mbits
- _ -> Nothing
- _ -> Nothing
+ case parts of
+ (p1:p2:p3:p4:_) -> mapMaybe readMaybe [p1,p2,p3,p4]
+ _ -> []
+ where
+ parts = splitOneOf "./" s
+instance Read Cidr where
+ -- | Parse everything or nothing.
+ readsPrec _ = \s ->
+ case (octets_from_cidr_string s) of
+ [oct1, oct2, oct3, oct4] ->
+ case (maskbits_from_cidr_string s) of
+ Just mbits ->
+ [(Cidr (IPv4Address oct1 oct2 oct3 oct4) mbits, "")]
+ _ -> []
+ _ -> []
-- | Given a CIDR, return the minimum valid IPv4 address contained
combine_adjacent cidr1 cidr2
| not (adjacent cidr1 cidr2) = Nothing
| (maskbits cidr1 == Zero) = Nothing
- | otherwise = Just $ cidr1 { maskbits = decrement (maskbits cidr1) }
+ | otherwise = Just $ cidr1 { maskbits = pred (maskbits cidr1) }
enumerate :: Cidr -> [IPv4Address]
enumerate cidr = [(min_host cidr)..(max_host cidr)]
+-- Test lists.
+cidr_tests :: Test
+cidr_tests =
+ testGroup "CIDR Tests" [
+ test_enumerate,
+ test_min_host1,
+ test_max_host1,
+ test_equality1,
+ test_contains1,
+ test_contains2,
+ test_contains_proper1,
+ test_contains_proper2,
+ test_adjacent1,
+ test_adjacent2,
+ test_adjacent3,
+ test_adjacent4,
+ test_combine_contained1,
+ test_combine_contained2,
+ test_combine_all1,
+ test_combine_all2,
+ test_combine_all3 ]
+
+cidr_properties :: Test
+cidr_properties =
+ testGroup "CIDR Properties" [
+ testProperty
+ "All CIDRs contain themselves"
+ prop_all_cidrs_contain_themselves,
+
+ testProperty
+ "contains_proper is intransitive"
+ prop_contains_proper_intransitive
+ ]
+
-- HUnit Tests
+test_enumerate :: Test
+test_enumerate =
+ testCase desc $ assertEqual desc expected actual
+ where
+ desc = "192.168.0.240/30 is enumerated correctly"
+ oct1 = toEnum 192
+ oct2 = toEnum 168
+ oct3 = minBound
+ mk_ip = IPv4Address oct1 oct2 oct3
+ addr1 = mk_ip $ toEnum 240
+ addr2 = mk_ip $ toEnum 241
+ addr3 = mk_ip $ toEnum 242
+ addr4 = mk_ip $ toEnum 243
+ expected = [addr1, addr2, addr3, addr4]
+ actual = enumerate $ read "192.168.0.240/30"
test_min_host1 :: Test
test_min_host1 =
actual
where
desc = "The minimum host in 10.0.0.0/24 is 10.0.0.0"
- actual = show $ min_host (fromJust $ cidr_from_string "10.0.0.0/24")
+ actual = show $ min_host (read "10.0.0.0/24")
expected = "10.0.0.0"
actual
where
desc = "The maximum host in 10.0.0.0/24 is 10.0.0.255"
- actual = show $ max_host (fromJust $ cidr_from_string "10.0.0.0/24")
+ actual = show $ max_host (read "10.0.0.0/24")
expected = "10.0.0.255"
(cidr1 == cidr1)
where
desc = "10.1.1.0/23 equals itself"
- cidr1 = fromJust $ cidr_from_string "10.1.1.0/23"
+ cidr1 = read "10.1.1.0/23" :: Cidr
test_contains1 :: Test
(cidr1 `contains` cidr2)
where
desc = "10.1.1.0/23 contains 10.1.1.0/24"
- cidr1 = fromJust $ cidr_from_string "10.1.1.0/23"
- cidr2 = fromJust $ cidr_from_string "10.1.1.0/24"
+ cidr1 = read "10.1.1.0/23"
+ cidr2 = read "10.1.1.0/24"
test_contains2 :: Test
(cidr1 `contains` cidr1)
where
desc = "10.1.1.0/23 contains itself"
- cidr1 = fromJust $ cidr_from_string "10.1.1.0/23"
+ cidr1 = read "10.1.1.0/23"
test_contains_proper1 :: Test
(cidr1 `contains_proper` cidr2)
where
desc = "10.1.1.0/23 contains 10.1.1.0/24 properly"
- cidr1 = fromJust $ cidr_from_string "10.1.1.0/23"
- cidr2 = fromJust $ cidr_from_string "10.1.1.0/24"
+ cidr1 = read "10.1.1.0/23"
+ cidr2 = read "10.1.1.0/24"
test_contains_proper2 :: Test
(cidr1 `contains_proper` cidr1)
where
desc = "10.1.1.0/23 does not contain itself properly"
- cidr1 = fromJust $ cidr_from_string "10.1.1.0/23"
+ cidr1 = read "10.1.1.0/23"
test_adjacent1 :: Test
(cidr1 `adjacent` cidr2)
where
desc = "10.1.0.0/24 is adjacent to 10.1.1.0/24"
- cidr1 = fromJust $ cidr_from_string "10.1.0.0/24"
- cidr2 = fromJust $ cidr_from_string "10.1.1.0/24"
+ cidr1 = read "10.1.0.0/24"
+ cidr2 = read "10.1.1.0/24"
test_adjacent2 :: Test
(cidr1 `adjacent` cidr2)
where
desc = "10.1.0.0/23 is not adjacent to 10.1.0.0/24"
- cidr1 = fromJust $ cidr_from_string "10.1.0.0/23"
- cidr2 = fromJust $ cidr_from_string "10.1.0.0/24"
+ cidr1 = read "10.1.0.0/23"
+ cidr2 = read "10.1.0.0/24"
test_adjacent3 :: Test
(cidr1 `adjacent` cidr2)
where
desc = "10.1.0.0/24 is not adjacent to 10.2.5.0/24"
- cidr1 = fromJust $ cidr_from_string "10.1.0.0/24"
- cidr2 = fromJust $ cidr_from_string "10.2.5.0/24"
+ cidr1 = read "10.1.0.0/24"
+ cidr2 = read "10.2.5.0/24"
test_adjacent4 :: Test
(cidr1 `adjacent` cidr2)
where
desc = "10.1.1.0/24 is not adjacent to 10.1.2.0/24"
- cidr1 = fromJust $ cidr_from_string "10.1.1.0/24"
- cidr2 = fromJust $ cidr_from_string "10.1.2.0/24"
+ cidr1 = read "10.1.1.0/24"
+ cidr2 = read "10.1.2.0/24"
test_combine_contained1 :: Test
(combine_contained test_cidrs)
where
desc = "10.0.0.0/8, 10.1.0.0/16, and 10.1.1.0/24 combine to 10.0.0.0/8"
- cidr1 = fromJust $ cidr_from_string "10.0.0.0/8"
- cidr2 = fromJust $ cidr_from_string "10.1.0.0/16"
- cidr3 = fromJust $ cidr_from_string "10.1.1.0/24"
+ cidr1 = read "10.0.0.0/8"
+ cidr2 = read "10.1.0.0/16"
+ cidr3 = read "10.1.1.0/24"
expected_cidrs = [cidr1]
test_cidrs = [cidr1, cidr2, cidr3]
(combine_contained [cidr1, cidr2])
where
desc = "192.168.3.0/23 does not contain 192.168.1.0/24"
- cidr1 = fromJust $ cidr_from_string "192.168.3.0/23"
- cidr2 = fromJust $ cidr_from_string "192.168.1.0/24"
+ cidr1 = read "192.168.3.0/23"
+ cidr2 = read "192.168.1.0/24"
test_combine_all1 :: Test
where
desc = "10.0.0.0/24 is adjacent to 10.0.1.0/24 "
++ "and 10.0.3.0/23 contains 10.0.2.0/24"
- cidr1 = fromJust $ cidr_from_string "10.0.0.0/24"
- cidr2 = fromJust $ cidr_from_string "10.0.1.0/24"
- cidr3 = fromJust $ cidr_from_string "10.0.2.0/24"
- cidr4 = fromJust $ cidr_from_string "10.0.3.0/23"
- cidr5 = fromJust $ cidr_from_string "10.0.0.0/23"
- expected_cidrs = [fromJust $ cidr_from_string "10.0.0.0/22"]
+ cidr1 = read "10.0.0.0/24"
+ cidr2 = read "10.0.1.0/24"
+ cidr3 = read "10.0.2.0/24"
+ cidr4 = read "10.0.3.0/23"
+ cidr5 = read "10.0.0.0/23"
+ expected_cidrs = [read "10.0.0.0/22"]
test_cidrs = [cidr1, cidr2, cidr3, cidr4, cidr5]
(combine_all test_cidrs)
where
desc = "127.0.0.1/32 combines with itself recursively"
- cidr1 = fromJust $ cidr_from_string "127.0.0.1/32"
+ cidr1 = read "127.0.0.1/32"
expected_cidrs = [cidr1]
test_cidrs = [cidr1, cidr1, cidr1, cidr1, cidr1]
where
desc = "10.0.0.16, 10.0.0.17, 10.0.0.18, and "
++ "10.0.0.19 get combined into 10.0.0.16/30"
- cidr1 = fromJust $ cidr_from_string "10.0.0.16/32"
- cidr2 = fromJust $ cidr_from_string "10.0.0.17/32"
- cidr3 = fromJust $ cidr_from_string "10.0.0.18/32"
- cidr4 = fromJust $ cidr_from_string "10.0.0.19/32"
- expected_cidrs = [fromJust $ cidr_from_string "10.0.0.16/30"]
+ cidr1 = read "10.0.0.16/32"
+ cidr2 = read "10.0.0.17/32"
+ cidr3 = read "10.0.0.18/32"
+ cidr4 = read "10.0.0.19/32"
+ expected_cidrs = [read "10.0.0.16/30"]
test_cidrs = [cidr1, cidr2, cidr3, cidr4]
-cidr_tests :: Test
-cidr_tests =
- testGroup "CIDR Tests" [
- test_min_host1,
- test_max_host1,
- test_equality1,
- test_contains1,
- test_contains2,
- test_contains_proper1,
- test_contains_proper2,
- test_adjacent1,
- test_adjacent2,
- test_adjacent3,
- test_adjacent4,
- test_combine_contained1,
- test_combine_contained2,
- test_combine_all1,
- test_combine_all2,
- test_combine_all3 ]
-
-
-- QuickCheck Tests
prop_all_cidrs_contain_themselves :: Cidr -> Bool
prop_all_cidrs_contain_themselves cidr1 = cidr1 `contains` cidr1
prop_contains_proper_intransitive cidr1 cidr2 =
(cidr1 `contains_proper` cidr2) ==>
(not (cidr2 `contains_proper` cidr1))
-
-cidr_properties :: Test
-cidr_properties =
- testGroup "CIDR Properties" [
- testProperty
- "All CIDRs contain themselves"
- prop_all_cidrs_contain_themselves,
-
- testProperty
- "contains_proper is intransitive"
- prop_contains_proper_intransitive
- ]
projects / hath.git / blobdiff