module Main
where
-import Control.Concurrent.ParallelIO.Global (
- parallel,
- stopGlobalPool )
-import Control.Monad (unless, when)
+import Control.Concurrent.ParallelIO.Global ( stopGlobalPool )
+import Control.Monad (when)
import qualified Data.ByteString.Char8 as BS (intercalate, pack, unpack)
import Data.List ((\\), intercalate)
import Data.Maybe (catMaybes, isNothing)
import Data.String.Utils (splitWs)
-import System.Exit (ExitCode(..), exitSuccess, exitWith)
+import Network.DNS.Types ( DNSError (NameError) )
+import System.Exit (ExitCode(..), exitWith)
import System.IO (stderr, hPutStrLn)
+import Text.Read (readMaybe)
import Cidr (
Cidr(..),
- cidr_from_string,
combine_all,
enumerate,
max_octet1,
min_octet2,
min_octet3,
min_octet4 )
-import CommandLine (
- help_set,
- help_text,
- input_function,
- Mode(..),
- parse_errors,
- parse_mode )
-import DNS (Domain, lookup_ptrs)
-import ExitCodes ( exit_args_parse_failed, exit_invalid_cidr )
+import CommandLine (Args(..), get_args)
+import DNS (Domain, PTRResult, lookup_ptrs)
+import ExitCodes ( exit_invalid_cidr )
import Octet ()
-- | Add non_addr_chars on either side of the given String. This
-- prevents (for example) the regex '127.0.0.1' from matching
-- '127.0.0.100'.
-addr_barrier :: String -> String
-addr_barrier x = non_addr_char ++ x ++ non_addr_char
+add_barriers :: String -> String
+add_barriers x = non_addr_char ++ x ++ non_addr_char
-- | The magic happens here. We take a CIDR String as an argument, and
-- 3. Generate a regex matching every value between those min and
-- max values.
-- 4. Join the regexes from step 3 with regexes matching periods.
--- 5. Stick an address boundary on either side of the result.
-cidr_to_regex :: Cidr.Cidr -> String
-cidr_to_regex cidr =
- addr_barrier (intercalate "\\." [range1, range2, range3, range4])
+-- 5. Stick an address boundary on either side of the result if
+-- use_barriers is True.
+--
+cidr_to_regex :: Bool -> Cidr.Cidr -> String
+cidr_to_regex use_barriers cidr =
+ let f = if use_barriers then add_barriers else id in
+ f (intercalate "\\." [range1, range2, range3, range4])
where
range1 = numeric_range min1 max1
range2 = numeric_range min2 max2
-- | Take two Ints as parameters, and return a regex matching any
-- integer between them (inclusive).
+--
+-- IMPORTANT: we match from max to min so that if e.g. the last
+-- octet is '255', we want '255' to match before '2' in the regex
+-- (255|254|...|3|2|1) which does not happen if we use
+-- (1|2|3|...|254|255).
+--
numeric_range :: Int -> Int -> String
numeric_range x y =
- alternate (map show [lower..upper])
+ alternate (map show $ reverse [lower..upper])
where
lower = minimum [x,y]
upper = maximum [x,y]
main :: IO ()
main = do
- -- First, check for any errors that occurred while parsing
- -- the command line options.
- errors <- CommandLine.parse_errors
- unless (null errors) $ do
- hPutStrLn stderr (concat errors)
- putStrLn CommandLine.help_text
- exitWith (ExitFailure exit_args_parse_failed)
-
- -- Next, check to see if the 'help' option was passed to the
- -- program. If it was, display the help, and exit successfully.
- help_opt_set <- CommandLine.help_set
- when help_opt_set $ do
- putStrLn CommandLine.help_text
- exitSuccess
-
- -- The input function we receive here should know what to read.
- inputfunc <- (CommandLine.input_function)
- input <- inputfunc
+ args <- get_args
+
+ -- This reads stdin.
+ input <- getContents
let cidr_strings = splitWs input
- let cidrs = map cidr_from_string cidr_strings
+ let cidrs = map readMaybe cidr_strings
when (any isNothing cidrs) $ do
- putStrLn "Error: not valid CIDR notation."
+ hPutStrLn stderr "ERROR: not valid CIDR notation:"
+
+ -- Output the bad lines, safely.
+ let pairs = zip cidr_strings cidrs
+ let print_pair (x, Nothing) = hPutStrLn stderr (" * " ++ x)
+ print_pair (_, _) = return ()
+
+ mapM_ print_pair pairs
exitWith (ExitFailure exit_invalid_cidr)
-- Filter out only the valid ones.
let valid_cidrs = catMaybes cidrs
- -- Get the mode of operation.
- mode <- CommandLine.parse_mode
-
- case mode of
- Regex -> do
- let regexes = map cidr_to_regex valid_cidrs
+ case args of
+ Regexed{} -> do
+ let cidrs' = combine_all valid_cidrs
+ let regexes = map (cidr_to_regex (barriers args)) cidrs'
putStrLn $ alternate regexes
- Reduce ->
+ Reduced{} ->
mapM_ print (combine_all valid_cidrs)
- Dupe ->
+ Duped{} ->
mapM_ print dupes
where
dupes = valid_cidrs \\ (combine_all valid_cidrs)
- Diff -> do
+ Diffed{} -> do
mapM_ putStrLn deletions
mapM_ putStrLn additions
where
deletions = map (\s -> '-' : (show s)) dupes
newcidrs = (combine_all valid_cidrs) \\ valid_cidrs
additions = map (\s -> '+' : (show s)) newcidrs
- List -> do
+ Listed{} -> do
let combined_cidrs = combine_all valid_cidrs
let addrs = concatMap enumerate combined_cidrs
mapM_ print addrs
- Reverse -> do
+ Reversed{} -> do
let combined_cidrs = combine_all valid_cidrs
let addrs = concatMap enumerate combined_cidrs
let addr_bytestrings = map (BS.pack . show) addrs
ptrs <- lookup_ptrs addr_bytestrings
let pairs = zip addr_bytestrings ptrs
- _ <- parallel (map (putStrLn . show_pair) pairs)
- return ()
+ mapM_ (putStrLn . show_pair) pairs
stopGlobalPool
where
- show_pair :: (Domain, Maybe [Domain]) -> String
- show_pair (s, mds) =
+ show_pair :: (Domain, PTRResult) -> String
+ show_pair (s, eds) =
(BS.unpack s) ++ ": " ++ results
where
space = BS.pack " "
results =
- case mds of
- Nothing -> ""
- Just ds -> BS.unpack $ BS.intercalate space ds
+ case eds of
+ -- NameError simply means "not found" so we output nothing.
+ Left NameError -> ""
+ Left err -> "ERROR (" ++ (show err) ++ ")"
+ Right ds -> BS.unpack $ BS.intercalate space ds
projects / hath.git / blobdiff