+cidr_from_string :: String -> Cidr
+cidr_from_string s
+ | addr == IPv4Address.None = Cidr.None
+ | mbits == Maskbits.None = Cidr.None
+ | otherwise = Cidr addr mbits
+ where
+ addr = ipv4address_from_octets (oct1) (oct2) (oct3) (oct4)
+ oct1 = (octs !! 0)
+ oct2 = (octs !! 1)
+ oct3 = (octs !! 2)
+ oct4 = (octs !! 3)
+ octs = octets_from_cidr_string s
+ mbits = maskbits_from_cidr_string s
+
+
+
+min_host :: Cidr -> IPv4Address
+min_host Cidr.None = IPv4Address.None
+min_host (Cidr IPv4Address.None _) = IPv4Address.None
+min_host (Cidr _ Maskbits.None) = IPv4Address.None
+min_host (Cidr addr mask)
+ | mask == ThirtyTwo = addr
+ | mask == ThirtyOne = addr { octet4 = apply_mask oct4 Seven }
+ | mask == Thirty = addr { octet4 = apply_mask oct4 Six }
+ | mask == TwentyNine = addr { octet4 = apply_mask oct4 Five }
+ | mask == TwentyEight = addr { octet4 = apply_mask oct4 Four }
+ | mask == TwentySeven = addr { octet4 = apply_mask oct4 Three }
+ | mask == TwentySix = addr { octet4 = apply_mask oct4 Two }
+ | mask == TwentyFive = addr { octet4 = apply_mask oct4 One }
+ | mask == TwentyFour = addr { octet4 = min_octet }
+ | mask == TwentyThree = addr { octet3 = apply_mask oct3 Seven,
+ octet4 = min_octet }
+ | mask == TwentyTwo = addr { octet3 = apply_mask oct3 Six,
+ octet4 = min_octet }
+ | mask == TwentyOne = addr { octet3 = apply_mask oct3 Five,
+ octet4 = min_octet }
+ | mask == Twenty = addr { octet3 = apply_mask oct3 Four,
+ octet4 = min_octet }
+ | mask == Nineteen = addr { octet3 = apply_mask oct3 Three,
+ octet4 = min_octet }
+ | mask == Eighteen = addr { octet3 = apply_mask oct3 Two,
+ octet4 = min_octet }
+ | mask == Seventeen = addr { octet3 = apply_mask oct3 One,
+ octet4 = min_octet }
+ | mask == Sixteen = addr { octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Fifteen = addr { octet2 = apply_mask oct2 Seven,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Fourteen = addr { octet2 = apply_mask oct2 Six,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Thirteen = addr { octet2 = apply_mask oct2 Five,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Twelve = addr { octet2 = apply_mask oct2 Four,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Eleven = addr { octet2 = apply_mask oct2 Three,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Ten = addr { octet2 = apply_mask oct2 Two,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Nine = addr { octet2 = apply_mask oct2 One,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Eight = addr { octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Seven = addr { octet1 = apply_mask oct1 Seven,
+ octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Six = addr { octet1 = apply_mask oct1 Six,
+ octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Five = addr { octet1 = apply_mask oct1 Five,
+ octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Four = addr { octet1 = apply_mask oct1 Four,
+ octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Three = addr { octet1 = apply_mask oct1 Three,
+ octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Two = addr { octet1 = apply_mask oct1 Two,
+ octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == One = addr { octet1 = apply_mask oct1 One,
+ octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | mask == Zero = addr { octet1 = min_octet,
+ octet2 = min_octet,
+ octet3 = min_octet,
+ octet4 = min_octet }
+ | otherwise = addr
+ where
+ oct1 = (octet1 addr)
+ oct2 = (octet2 addr)
+ oct3 = (octet3 addr)
+ oct4 = (octet4 addr)
+
+
+
+max_host :: Cidr -> IPv4Address
+max_host Cidr.None = IPv4Address.None
+max_host (Cidr IPv4Address.None _) = IPv4Address.None
+max_host (Cidr _ Maskbits.None) = IPv4Address.None
+max_host (Cidr addr mask)
+ | mask == ThirtyTwo = addr
+ | mask == ThirtyOne = addr { octet4 = oct4 { b8 = B.One } }
+ | mask == Thirty = addr { octet4 = oct4 { b7 = B.One, b8 = B.One } }
+ | mask == TwentyNine = addr { octet4 = oct4 { b6 = B.One,
+ b7 = B.One,
+ b8 = B.One } }
+ | mask == TwentyEight = addr { octet4 = oct4 { b5 = B.One,
+ b6 = B.One,
+ b7 = B.One,
+ b8 = B.One } }
+ | mask == TwentySeven = addr { octet4 = oct4 { b4 = B.One,
+ b5 = B.One,
+ b6 = B.One,
+ b7 = B.One,
+ b8 = B.One } }
+ | mask == TwentySix = addr { octet4 = oct4 { b3 = B.One,
+ b4 = B.One,
+ b5 = B.One,
+ b6 = B.One,
+ b7 = B.One,
+ b8 = B.One } }
+ | mask == TwentyFive = addr { octet4 = oct4 { b2 = B.One,
+ b3 = B.One,
+ b4 = B.One,
+ b5 = B.One,
+ b6 = B.One,
+ b7 = B.One,
+ b8 = B.One } }
+ | mask == TwentyFour = addr { octet4 = max_octet }
+ | mask == TwentyThree = ipv4address_from_octets oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 a23 B.One) (max_octet)
+ | mask == TwentyTwo = ipv4address_from_octets oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 B.One B.One) (max_octet)
+ | mask == TwentyOne = ipv4address_from_octets oct1 oct2 (Octet a17 a18 a19 a20 a21 B.One B.One B.One) (max_octet)
+ | mask == Twenty = ipv4address_from_octets oct1 oct2 (Octet a17 a18 a19 a20 B.One B.One B.One B.One) (max_octet)
+ | mask == Nineteen = ipv4address_from_octets oct1 oct2 (Octet a17 a18 a19 B.One B.One B.One B.One B.One) (max_octet)
+ | mask == Eighteen = ipv4address_from_octets oct1 oct2 (Octet a17 a18 B.One B.One B.One B.One B.One B.One) (max_octet)
+ | mask == Seventeen = ipv4address_from_octets oct1 oct2 (Octet a17 B.One B.One B.One B.One B.One B.One B.One) (max_octet)
+ | mask == Sixteen = ipv4address_from_octets oct1 oct2 (max_octet) (max_octet)
+ | mask == Fifteen = ipv4address_from_octets oct1 (Octet a9 a10 a11 a12 a13 a14 a15 B.One) (max_octet) (max_octet)
+ | mask == Fourteen = ipv4address_from_octets oct1 (Octet a9 a10 a11 a12 a13 a14 B.One B.One) (max_octet) (max_octet)
+ | mask == Thirteen = ipv4address_from_octets oct1 (Octet a9 a10 a11 a12 a13 B.One B.One B.One) (max_octet) (max_octet)
+ | mask == Twelve = ipv4address_from_octets oct1 (Octet a9 a10 a11 a12 B.One B.One B.One B.One) (max_octet) (max_octet)
+ | mask == Eleven = ipv4address_from_octets oct1 (Octet a9 a10 a11 B.One B.One B.One B.One B.One) (max_octet) (max_octet)
+ | mask == Ten = ipv4address_from_octets oct1 (Octet a9 a10 B.One B.One B.One B.One B.One B.One) (max_octet) (max_octet)
+ | mask == Nine = ipv4address_from_octets oct1 (Octet a9 B.One B.One B.One B.One B.One B.One B.One) (max_octet) (max_octet)
+ | mask == Eight = ipv4address_from_octets oct1 (max_octet) (max_octet) (max_octet)
+ | mask == Seven = ipv4address_from_octets (Octet a1 a2 a3 a4 a5 a6 a7 B.One) (max_octet) (max_octet) (max_octet)
+ | mask == Six = ipv4address_from_octets (Octet a1 a2 a3 a4 a5 a6 B.One B.One) (max_octet) (max_octet) (max_octet)
+ | mask == Five = ipv4address_from_octets (Octet a1 a2 a3 a4 a5 B.One B.One B.One) (max_octet) (max_octet) (max_octet)
+ | mask == Four = ipv4address_from_octets (Octet a1 a2 a3 a4 B.One B.One B.One B.One) (max_octet) (max_octet) (max_octet)
+ | mask == Three = ipv4address_from_octets (Octet a1 a2 a3 B.One B.One B.One B.One B.One) (max_octet) (max_octet) (max_octet)
+ | mask == Two = ipv4address_from_octets (Octet a1 a2 B.One B.One B.One B.One B.One B.One) (max_octet) (max_octet) (max_octet)
+ | mask == One = ipv4address_from_octets (Octet a1 B.One B.One B.One B.One B.One B.One B.One) (max_octet) (max_octet) (max_octet)
+ | mask == Zero = ipv4address_from_octets (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)
+ oct1 = (octet1 addr)
+ oct2 = (octet2 addr)
+ oct3 = (octet3 addr)
+ oct4 = (octet4 addr)
+
+
+
+min_octet1 :: Cidr -> Octet
+min_octet1 cidr = octet1 (min_host cidr)
+
+min_octet2 :: Cidr -> Octet
+min_octet2 cidr = octet2 (min_host cidr)
+
+min_octet3 :: Cidr -> Octet
+min_octet3 cidr = octet3 (min_host cidr)
+
+min_octet4 :: Cidr -> Octet
+min_octet4 cidr = octet4 (min_host cidr)
+
+max_octet1 :: Cidr -> Octet
+max_octet1 cidr = octet1 (max_host cidr)
+
+max_octet2 :: Cidr -> Octet
+max_octet2 cidr = octet2 (max_host cidr)
+
+max_octet3 :: Cidr -> Octet
+max_octet3 cidr = octet3 (max_host cidr)
+
+max_octet4 :: Cidr -> Octet
+max_octet4 cidr = octet4 (max_host cidr)
+
+
+
+-- Return true if the first argument (a CIDR range) contains the
+-- second (another CIDR range). There are a lot of ways we can be fed
+-- junk here. For lack of a better alternative, just return False when
+-- we are given nonsense.
+contains :: Cidr -> Cidr -> Bool
+contains Cidr.None _ = False
+contains _ Cidr.None = False
+contains (Cidr _ Maskbits.None) _ = False
+contains (Cidr IPv4Address.None _) _ = False
+contains _ (Cidr _ Maskbits.None) = False
+contains _ (Cidr IPv4Address.None _) = False
+
+-- If the number of bits in the network part of the first address is
+-- larger than the number of bits in the second, there is no way that
+-- the first range can contain the second. For, if the number of
+-- network bits is larger, then the number of host bits must be
+-- smaller, and if cidr1 has fewer hosts than cidr2, cidr1 most
+-- certainly does not contain cidr2.
+--
+-- On the other hand, if the first argument (cidr1) has fewer (or the
+-- same number of) network bits as the second, it can contain the
+-- second. In this case, we need to check that every host in cidr2 is
+-- contained in cidr1. If a host in cidr2 is contained in cidr1, then
+-- at least mbits1 of an address in cidr2 will match cidr1. For
+-- example,
+--
+-- cidr1 = 192.168.1.0/23, cidr2 = 192.168.1.100/24
+--
+-- Here, cidr2 contains all of 192.168.1.0 through
+-- 192.168.1.255. However, cidr1 contains BOTH 192.168.0.0 through
+-- 192.168.0.255 and 192.168.1.0 through 192.168.1.255. In essence,
+-- what we want to check is that cidr2 "begins with" something that
+-- cidr1 CAN begin with. Since cidr1 can begin with 192.168.1, and
+-- cidr2 DOES, cidr1 contains cidr2..
+--
+-- The way that we check this is to apply cidr1's mask to cidr2's
+-- address and see if the result is the same as cidr1's mask applied
+-- to cidr1's address.
+--
+contains (Cidr addr1 mbits1) (Cidr addr2 mbits2)
+ | mbits1 > mbits2 = False
+ | otherwise = addr1masked == addr2masked
+ where
+ addr1masked = apply_mask addr1 mbits1
+ addr2masked = apply_mask addr2 mbits1