| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
Net.IPv4
Contents
Description
An IPv4 data type
This module provides the IPv4 data type and functions for working
with it. There are also encoding and decoding functions provided
in this module, but they should be imported from
Net.IPv4.Text and Net.ByteString.Char8 instead. They are
defined here so that the FromJSON and ToJSON instances can
use them.
At some point, a highly efficient IPv4-to-ByteString function needs
to be added to this module to take advantage of aeson's new
toEncoding method.
Synopsis
- ipv4 :: Word8 -> Word8 -> Word8 -> Word8 -> IPv4
- fromOctets :: Word8 -> Word8 -> Word8 -> Word8 -> IPv4
- fromTupleOctets :: (Word8, Word8, Word8, Word8) -> IPv4
- toOctets :: IPv4 -> (Word8, Word8, Word8, Word8)
- any :: IPv4
- loopback :: IPv4
- broadcast :: IPv4
- private :: IPv4 -> Bool
- reserved :: IPv4 -> Bool
- public :: IPv4 -> Bool
- encode :: IPv4 -> Text
- decode :: Text -> Maybe IPv4
- builder :: IPv4 -> Builder
- reader :: Reader IPv4
- parser :: Parser IPv4
- encodeUtf8 :: IPv4 -> ByteString
- decodeUtf8 :: ByteString -> Maybe IPv4
- builderUtf8 :: IPv4 -> Builder
- parserUtf8 :: Parser IPv4
- encodeString :: IPv4 -> String
- decodeString :: String -> Maybe IPv4
- print :: IPv4 -> IO ()
- range :: IPv4 -> Word8 -> IPv4Range
- fromBounds :: IPv4 -> IPv4 -> IPv4Range
- normalize :: IPv4Range -> IPv4Range
- contains :: IPv4Range -> IPv4 -> Bool
- member :: IPv4 -> IPv4Range -> Bool
- lowerInclusive :: IPv4Range -> IPv4
- upperInclusive :: IPv4Range -> IPv4
- toList :: IPv4Range -> [IPv4]
- toGenerator :: MonadPlus m => IPv4Range -> m IPv4
- private24 :: IPv4Range
- private20 :: IPv4Range
- private16 :: IPv4Range
- encodeRange :: IPv4Range -> Text
- decodeRange :: Text -> Maybe IPv4Range
- builderRange :: IPv4Range -> Builder
- parserRange :: Parser IPv4Range
- printRange :: IPv4Range -> IO ()
- newtype IPv4 = IPv4 {}
- data IPv4Range = IPv4Range {
- ipv4RangeBase :: !IPv4
- ipv4RangeLength :: !Word8
Conversion Functions
ipv4 :: Word8 -> Word8 -> Word8 -> Word8 -> IPv4 Source #
Create an IPv4 address from four octets. The first argument
is the most significant octet. The last argument is the least
significant. Since IP addresses are commonly written using dot-decimal
notation, this is the recommended way to create an IP address.
Additionally, it is used for the Show and Read instances
of IPv4 to help keep things readable in GHCi.
>>>let addr = ipv4 192 168 1 1>>>addripv4 192 168 1 1>>>getIPv4 addr3232235777
fromOctets :: Word8 -> Word8 -> Word8 -> Word8 -> IPv4 Source #
An alias for the ipv4 smart constructor.
fromTupleOctets :: (Word8, Word8, Word8, Word8) -> IPv4 Source #
An uncurried variant of fromOctets.
toOctets :: IPv4 -> (Word8, Word8, Word8, Word8) Source #
Convert an IPv4 address into a quadruple of octets. The first
element in the quadruple is the most significant octet. The last
element is the least significant octet.
Special IP Addresses
Range Predicates
private :: IPv4 -> Bool Source #
Checks to see if the IPv4 address belongs to a private
network. The three private networks that are checked are
10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
public :: IPv4 -> Bool Source #
Checks to see if the IPv4 address is publicly routable.
public x == not (reserved x)
Textual Conversion
Text
UTF-8 ByteString
encodeUtf8 :: IPv4 -> ByteString Source #
Encode an IPv4 address to a UTF-8 encoded ByteString.
decodeUtf8 :: ByteString -> Maybe IPv4 Source #
builderUtf8 :: IPv4 -> Builder Source #
parserUtf8 :: Parser IPv4 Source #
String
These functions exist for the convenience of those who need a
String representation of an IPv4 address. Using them
is discouraged unless the end user is working with a library
that can only use String to deal with textual data (such as
pandoc, hxr, or network).
encodeString :: IPv4 -> String Source #
Printing
IPv4 Ranges
Range functions
fromBounds :: IPv4 -> IPv4 -> IPv4Range Source #
Given an inclusive lower and upper ip address, create the smallest
IPv4Range that contains the two. This is helpful in situations where
input given as a range like 192.168.16.0-192.168.19.255 needs to be
handled. This makes the range broader if it cannot be represented in
CIDR notation.
>>>printRange $ fromBounds (fromOctets 192 168 16 0) (fromOctets 192 168 19 255)192.168.16.0/22>>>printRange $ fromBounds (fromOctets 10 0 5 7) (fromOctets 10 0 5 14)10.0.5.0/28
normalize :: IPv4Range -> IPv4Range Source #
Normalize an IPv4Range. The first result of this is that the
IPv4 inside the IPv4Range is changed so that the insignificant
bits are zeroed out. For example:
>>>printRange $ normalize $ IPv4Range (fromOctets 192 168 1 19) 24192.168.1.0/24>>>printRange $ normalize $ IPv4Range (fromOctets 192 168 1 163) 28192.168.1.160/28
The second effect of this is that the mask length is lowered to
be 32 or smaller. Working with IPv4Ranges that have not been
normalized does not cause any issues for this library, although
other applications may reject such ranges (especially those with
a mask length above 32).
Note that normalize is idempotent, that is:
normalize r == (normalize . normalize) r
contains :: IPv4Range -> IPv4 -> Bool Source #
Checks to see if an IPv4 address belongs in the IPv4Range.
>>>let ip = fromOctets 10 10 1 92>>>contains (IPv4Range (fromOctets 10 0 0 0) 8) ipTrue>>>contains (IPv4Range (fromOctets 10 11 0 0) 16) ipFalse
Typically, element-testing functions are written to take the element as the first argument and the set as the second argument. This is intentionally written the other way for better performance when iterating over a collection. For example, you might test elements in a list for membership like this:
>>>let r = IPv4Range (fromOctets 10 10 10 6) 31>>>mapM_ (P.print . contains r) (take 5 $ iterate succ $ fromOctets 10 10 10 5)False True True False False
The implementation of contains ensures that (with GHC), the bitmask
creation and range normalization only occur once in the above example.
They are reused as the list is iterated.
member :: IPv4 -> IPv4Range -> Bool Source #
This is provided to mirror the interface provided by Data.Set. It
behaves just like contains but with flipped arguments.
member ip r == contains r ip
lowerInclusive :: IPv4Range -> IPv4 Source #
The inclusive lower bound of an IPv4Range. This is conventionally
understood to be the broadcast address of a subnet. For example:
>>>T.putStrLn $ encode $ lowerInclusive $ IPv4Range (ipv4 10 10 1 160) 2510.10.1.128
Note that the lower bound of a normalized IPv4Range is simply the
ip address of the range:
lowerInclusive r == ipv4RangeBase (normalize r)
upperInclusive :: IPv4Range -> IPv4 Source #
Conversion to IPv4
Private Ranges
Textual Conversion
Text
encodeRange :: IPv4Range -> Text Source #
builderRange :: IPv4Range -> Builder Source #
printRange :: IPv4Range -> IO () Source #
This exists mostly for testing purposes.
Types
A 32-bit Internet Protocol version 4 address. To use this with the
network library, it is necessary to use Network.Socket.htonl to
convert the underlying Word32 from host byte order to network byte
order.
Instances
The length should be between 0 and 32. These bounds are inclusive. This expectation is not in any way enforced by this library because it does not cause errors. A mask length greater than 32 will be treated as if it were 32.
Constructors
| IPv4Range | |
Fields
| |
Instances
Interoperability
The network library is commonly
used to open sockets and communicate over them. In the Network.Socket module,
it provides a type synonym HostAddress that, like IPv4, is used
to represent an IPv4 address. However, while IPv4 uses a big-endian representation
for ip addresses, HostAddress has platform dependent endianness.
Consequently, it is necessary to convert between the two as follows:
import Network.Socket (HostAddress,htonl,ntohl) toHostAddr :: IPv4 -> HostAddress toHostAddr (IPv4 w) = htonl w fromHostAddr :: HostAddress -> IPv4 fromHostAddr w = IPv4 (ntohl w)
These functions are not included with this library since it would require
picking up a dependency on network.