From: Michael Orlitzky Date: Thu, 5 Jun 2014 21:02:54 +0000 (-0400) Subject: Initial commit of something working. X-Git-Tag: 0.0.1~12 X-Git-Url: http://gitweb.michael.orlitzky.com/?p=list-remote-forwards.git;a=commitdiff_plain;h=e3ef76e60ddd54e5fad787c5883533d2410b3e2a Initial commit of something working. --- e3ef76e60ddd54e5fad787c5883533d2410b3e2a diff --git a/.ghci b/.ghci new file mode 100644 index 0000000..9c70fd2 --- /dev/null +++ b/.ghci @@ -0,0 +1,8 @@ +:set -isrc -idist/build/autogen +:load src/Main.hs +:load src/Report.hs + +import Database.HDBC +import Database.HDBC.Sqlite3 + +:set prompt "list-remote-forwards> " diff --git a/Setup.hs b/Setup.hs new file mode 100644 index 0000000..9a994af --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/doc/LICENSE b/doc/LICENSE new file mode 100644 index 0000000..bc08fe2 --- /dev/null +++ b/doc/LICENSE @@ -0,0 +1,619 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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This should return +# the set of all domains (i.e one column) that are local to the +# server. See the default value for an example. +# +# Default: "SELECT domain FROM domain WHERE domain <> 'ALL' ORDER BY domain;" +# +# domain_query = "SELECT DISTINCT domain FROM alias;" + + +# SQL query used to produce a list of all forwards on the mail +# system. This query should return the set of all (address, goto) +# triples, where "goto" is the destination address; i.e. to where +# the "address" forwards. The "goto" field may contain more +# than one email address, separated by commas. +# +# Default: "SELECT address,goto FROM alias ORDER BY address;" +# +# forward_query = "SELECT address,alias FROM aliases;" + + + +# Hostname where the database is located (Postgres-only). +# +# Default: None, a UNIX domain socket connection is attempted (Postgres only) +# +# host = "localhost" + + +# Password used to connect to the database (Postgres-only). +# +# Default: None (assumes passwordless authentication) +# +# password = "hunter2" + + +# Port number used to connect to the database (Postgres-only). +# +# Default: None, a UNIX domain socket connection is attempted (Postgres only) +# +# port = 5432 + + + +# Username used to connect to the database (Postgres-only). +# +# Default: The current user +# +# username = "postgres" diff --git a/doc/man1/list-remote-forwards.1 b/doc/man1/list-remote-forwards.1 new file mode 100644 index 0000000..fb9fb5c --- /dev/null +++ b/doc/man1/list-remote-forwards.1 @@ -0,0 +1,92 @@ +.TH list-remote-forwards 1 + +.SH NAME +list\-remote\-forwards \- List all remote forwards for mail accounts stored in +a SQL database +.SH SYNOPSIS + +\fBlist-remote-forwards\fR [\fIOPTIONS\fR] +.SH INPUT +.P +None. +.SH OUTPUT +.P +A list of addresses that are forwarded to remote domains. +.SH DESCRIPTION +.P +A list of local domains is supplied to the program (more or less) +through the \fI\-\-domain\-query\fR option. Any addresses which +forward to another address not contained in this list of local domains +is considered a remote forward. Remote forwards can cause problems for +a number of reasons, the most common of which are, +.IP \(bu 2 +If the sender has an SPF record authorizing his mail server to send +mail on his behalf, then when his message is forwarded by the +recipient's mail server, it will fail any subsequent SPF checks. This +will likely cause the message to be rejected, and the original +recipient's server will generate backscatter. +.IP \(bu +If any spam makes it through the filter on the recipient's mail +server, that spam will then be forwarded to a remote destination. The +remote destination will blame the forwarding server for the spam, and +that can impact its reputation and potentially lead to a blacklisting +even though the spam did not originate on the recipient's server. +.P +Whether or not these are an issue depends on the circumstances, but in +any case it is useful to know who is forwarding mail off-site. +.SH OPTIONS + +.IP \fB\-\-database\fR +The name of the database (or file, if SQLite) to which we should +connect. + +Default: The name of the current user (Postgres only). + +.IP \fB\-\-domain-query\fR +SQL query used to produce a list of local domains. This should return +the set of all domains (i.e one column) that are local to the +server. See the default value for an example. + +Default: \(dqSELECT domain FROM domain WHERE domain <> 'ALL' ORDER BY domain;\(dq + +.IP \fB\-\-forward-query\fR +SQL query used to produce a list of all forwards on the mail +system. This query should return the set of all (address, goto) +triples, where \(dqgoto\(dq is the destination address; i.e. to where +the \(dqaddress\(dq forwards. The \(dqgoto\(dq field may contain more +than one email address, separated by commas. + +Default: \(dqSELECT address,goto FROM alias ORDER BY address;\(dq + +.IP \fB\-\-host\fR +Hostname where the database is located (Postgres-only). + +Default: None, a UNIX domain socket connection is attempted (Postgres only) + +.IP \fB\-\-password\fR +Password used to connect to the database (Postgres-only). + +Default: None (assumes passwordless authentication) + +.IP \fB\-\-port\fR +Port number used to connect to the database (Postgres-only). + +Default: None, a UNIX domain socket connection is attempted (Postgres only) + +.IP \fB\-\-username\fR +Username used to connect to the database (Postgres-only). + +Default: The current user + +.SH EXAMPLES + +.nf +.I $ list-remote-forwards --database=postfixadmin.sqlite3 +user1@example.com -> user1@example.net +user2@example.com -> user1@example.org +user2@example.com -> user2@example.org +user2@example.com -> user3@example.org +.fi +.SH BUGS +.P +Send bugs to michael@orlitzky.com. diff --git a/list-remote-forwards.cabal b/list-remote-forwards.cabal new file mode 100644 index 0000000..cff0d70 --- /dev/null +++ b/list-remote-forwards.cabal @@ -0,0 +1,216 @@ +name: list-remote-forwards +version: 0.0.1 +cabal-version: >= 1.8 +author: Michael Orlitzky +maintainer: Michael Orlitzky +license: GPL-3 +license-file: doc/LICENSE +bug-reports: mailto:michael@orlitzky.com +category: Mail, Utils +build-type: Simple +extra-source-files: + doc/list-remote-forwards.example + doc/man1/list-remote-forwards.1 + test/fixtures/postfixadmin.sqlite3 +synopsis: + List all remote forwards for mail accounts stored in a SQL database. +description: + /Usage/: + . + @ + list-remote-forwards [OPTIONS] + @ + . + List all remote forwards for mail accounts stored in a SQL database. + . + A list of local domains is supplied to the program (more or less) + through the @--domain-query@ option. Any addresses which + forward to another address not contained in this list of local domains + is considered a remote forward. Remote forwards can cause problems for + a number of reasons, the most common of which are, + . + * If the sender has an SPF record authorizing his mail server to send + mail on his behalf, then when his message is forwarded by the + recipient's mail server, it will fail any subsequent SPF checks. This + will likely cause the message to be rejected, and the original + recipient's server will generate backscatter. + . + * If any spam makes it through the filter on the recipient's mail + server, that spam will then be forwarded to a remote destination. The + remote destination will blame the forwarding server for the spam, and + that can impact its reputation and potentially lead to a blacklisting + even though the spam did not originate on the recipient's server. + . + Whether or not these are an issue depends on the circumstances, but in + any case it is useful to know who is forwarding mail off-site. + . + /Input:/ + . + None. + . + /Output:/ + . + A list of addresses that are forwarded to remote domains. + . + /Options/: + . + @ + \--database + @ + . + The name of the database (or file, if SQLite) to which we should + connect. + . + Default: The name of the current user (Postgres only). + . + @ + \--domain-query + @ + SQL query used to produce a list of local domains. This should return + the set of all domains (i.e one column) that are local to the + server. See the default value for an example. + . + Default: \"SELECT domain FROM domain WHERE domain <> 'ALL' ORDER BY domain;\" + . + @ + \--forward-query + @ + . + SQL query used to produce a list of all forwards on the mail + system. This query should return the set of all (address, goto) + triples, where \"goto\" is the destination address; i.e. to where + the \"address\" forwards. The \"goto\" field may contain more + than one email address, separated by commas. + . + Default: \"SELECT address,goto FROM alias ORDER BY address;\" + . + @ + \--host + @ + . + Hostname where the database is located (Postgres-only). + . + Default: None, a UNIX domain socket connection is attempted (Postgres only) + . + @ + \--password + @ + . + Password used to connect to the database (Postgres-only). + . + Default: None (assumes passwordless authentication) + . + @ + \--port + @ + Port number used to connect to the database (Postgres-only). + . + Default: None, a UNIX domain socket connection is attempted (Postgres only) + . + @ + \--username + @ + . + Username used to connect to the database (Postgres-only). + . + Default: The current user + . + /Examples/: + . + @ + $ list-remote-forwards --database=postfixadmin.sqlite3 + user1@example.com -> user1@example.net + user2@example.com -> user1@example.org + user2@example.com -> user2@example.org + user2@example.com -> user3@example.org + @ + +executable list-remote-forwards + build-depends: + base >= 4.6 && < 5, + bytestring >= 0.10, + cmdargs >= 0.10, + configurator >= 0.2, + containers >= 0.5, + dns >= 1.2, + directory >= 1.2, + filepath >= 1.3, + HDBC >= 2.4, + HDBC-postgresql >= 2.3, + HDBC-sqlite3 >= 2.3, + MissingH >= 1.2, + tasty >= 0.8, + tasty-hunit >= 0.8, + tasty-quickcheck >= 0.8 + main-is: + Main.hs + + hs-source-dirs: + src/ + + other-modules: + Configuration + CommandLine + DNS + OptionalConfiguration + MxList + Report + + ghc-options: + -Wall + -fwarn-hi-shadowing + -fwarn-missing-signatures + -fwarn-name-shadowing + -fwarn-orphans + -fwarn-type-defaults + -fwarn-tabs + -fwarn-incomplete-record-updates + -fwarn-monomorphism-restriction + -fwarn-unused-do-bind + -rtsopts + -threaded + -optc-O3 + -optc-march=native + + +test-suite testsuite + type: exitcode-stdio-1.0 + hs-source-dirs: src test + main-is: TestSuite.hs + build-depends: + base >= 4.6 && < 5, + bytestring >= 0.10, + cmdargs >= 0.10, + configurator >= 0.2, + containers >= 0.5, + dns >= 1.2, + directory >= 1.2, + filepath >= 1.3, + HDBC >= 2.4, + HDBC-postgresql >= 2.3, + HDBC-sqlite3 >= 2.3, + MissingH >= 1.2, + tasty >= 0.8, + tasty-hunit >= 0.8, + tasty-quickcheck >= 0.8 + + -- It's not entirely clear to me why I have to reproduce all of this. + ghc-options: + -Wall + -fwarn-hi-shadowing + -fwarn-missing-signatures + -fwarn-name-shadowing + -fwarn-orphans + -fwarn-type-defaults + -fwarn-tabs + -fwarn-incomplete-record-updates + -fwarn-monomorphism-restriction + -fwarn-unused-do-bind + -O2 + + + +source-repository head + type: git + location: http://michael.orlitzky.com/git/list-remote-forwards.git + branch: master diff --git a/makefile b/makefile new file mode 100644 index 0000000..c024def --- /dev/null +++ b/makefile @@ -0,0 +1,56 @@ +PN = list-remote-forwards +BIN = dist/build/$(PN)/$(PN) +SRCS = $(shell find src/ -type f -name '*.hs') + +.PHONY : dist hlint + +$(BIN): $(PN).cabal $(SRCS) + runghc Setup.hs configure --user + runghc Setup.hs build + +doc: $(PN).cabal $(SRCS) + runghc Setup.hs hscolour --all + runghc Setup.hs haddock --all \ + --hyperlink-source \ + --haddock-options="--ignore-all-exports" + + +# +# Tests +# +TESTSUITE_BIN = dist/build/testsuite/testsuite +DOCTESTS_BIN = dist/build/doctests/doctests +TEST_SRCS := $(shell find test/ -type f -name '*.hs') + +$(TESTSUITE_BIN): $(PN).cabal $(SRCS) $(TEST_SRCS) + runghc Setup.hs configure --user --enable-tests --prefix=/ + runghc Setup.hs build + + +$(DOCTESTS_BIN): $(PN).cabal $(SRCS) $(TEST_SRCS) + runghc Setup.hs configure --user --enable-tests + runghc Setup.hs build + +test: $(BIN) $(TESTSUITE_BIN) $(DOCTESTS_BIN) + runghc Setup.hs test + + +# +# Misc +# + +dist: + runghc Setup.hs configure + TAR_OPTIONS="--format=ustar" runghc Setup.hs sdist + +hlint: + hlint --ignore="Use camelCase" \ + --ignore="Redundant bracket" \ + --color \ + src + +clean: + runghc Setup.hs clean + find ./ -type f -name '*.prof' -delete + find ./ -type f -name '*.o' -delete + find ./ -type f -name '*.hi' -delete diff --git a/src/CommandLine.hs b/src/CommandLine.hs new file mode 100644 index 0000000..9033f0d --- /dev/null +++ b/src/CommandLine.hs @@ -0,0 +1,80 @@ +module CommandLine ( + get_args ) +where + +import System.Console.CmdArgs ( + (&=), + cmdArgs, + def, + details, + help, + program, + summary ) + + +-- Get the version from Cabal. +import Paths_list_remote_forwards ( version ) +import Data.Version ( showVersion ) + +import OptionalConfiguration ( OptionalConfiguration(..) ) + + +description :: String +description = + "List all remote forwards for mail accounts stored in a SQL database." + +program_name :: String +program_name = "list-remote-forwards" + +my_summary :: String +my_summary = program_name ++ "-" ++ (showVersion version) + +database_help :: String +database_help = + "The name of the database (or file, if SQLite) to which we should connect" + +domain_query_help :: String +domain_query_help = + "SQL query used to produce the list of local domains" + +exclude_mx_help :: String +exclude_mx_help = + "MX for whom we don't report remote forwards" + +forward_query_help :: String +forward_query_help = + "SQL query used to produce the list of forwards, i.e. (to,from) pairs" + +host_help :: String +host_help = + "Hostname where the database is located (postgres-only)" + +password_help :: String +password_help = + "Password used to connect to the database (postgres-only)" + +port_help :: String +port_help = + "Port number used to connect to the database (postgres-only)" + +username_help :: String +username_help = + "Username used to connect to the database (postgres-only)" + +arg_spec :: OptionalConfiguration +arg_spec = + OptionalConfiguration { + database = def &= help database_help, + domain_query = def &= help domain_query_help, + exclude_mx = def &= help exclude_mx_help, + forward_query = def &= help forward_query_help, + host = def &= help host_help, + password = def &= help password_help, + port = def &= help port_help, + username = def &= help username_help } + &= program program_name + &= summary my_summary + &= details [description] + +get_args :: IO OptionalConfiguration +get_args = cmdArgs arg_spec diff --git a/src/Configuration.hs b/src/Configuration.hs new file mode 100644 index 0000000..7ef0722 --- /dev/null +++ b/src/Configuration.hs @@ -0,0 +1,83 @@ +-- | This module defines the 'Configuration' type, which is just a +-- wrapper around all of the configuration options we accept on the +-- command line. +-- +module Configuration ( + Configuration(..), + merge_optional ) +where + +import System.Console.CmdArgs.Default ( Default(..) ) + +import MxList (MxList(..)) +import qualified OptionalConfiguration as OC ( + OptionalConfiguration(..), + merge_maybes ) + +-- | The main configuration data type. This will be passed to most of +-- the important functions once it has been created. +-- +data Configuration = + Configuration { + database :: Maybe String, + domain_query :: String, + exclude_mx :: MxList, + forward_query :: String, + host :: Maybe String, + password :: Maybe String, + port :: Maybe Int, + username :: Maybe String } + deriving (Show) + + +-- | A Configuration with all of its fields set to their default +-- values. +-- +instance Default Configuration where + def = Configuration { + database = def, + domain_query = def_domain_query, + exclude_mx = def, + forward_query = def_forward_query, + host = def, + password = def, + port = def, + username = def } + where + def_domain_query = "SELECT domain " ++ + "FROM domain " ++ + "WHERE domain <> 'ALL' " ++ + "ORDER BY domain;" + + def_forward_query = "SELECT address,goto " ++ + "FROM alias " ++ + "ORDER BY address;" + +-- | Merge a 'Configuration' with an 'OptionalConfiguration'. This is +-- more or less the Monoid instance for 'OptionalConfiguration', but +-- since the two types are different, we have to repeat ourselves. +-- +merge_optional :: Configuration + -> OC.OptionalConfiguration + -> Configuration +merge_optional cfg opt_cfg = + Configuration + (OC.merge_maybes (database cfg) (OC.database opt_cfg)) + (merge (domain_query cfg) (OC.domain_query opt_cfg)) + all_excluded_mx + (merge (forward_query cfg) (OC.forward_query opt_cfg)) + (OC.merge_maybes (host cfg) (OC.host opt_cfg)) + (OC.merge_maybes (password cfg) (OC.password opt_cfg)) + (OC.merge_maybes (port cfg) (OC.port opt_cfg)) + (OC.merge_maybes (username cfg) (OC.username opt_cfg)) + where + -- | If the thing on the right is Just something, return that + -- something, otherwise return the thing on the left. + merge :: a -> Maybe a -> a + merge x Nothing = x + merge _ (Just y) = y + + -- If there are any optional usernames, use only those. + all_excluded_mx = if (null (get_mxs (OC.exclude_mx opt_cfg))) + then (exclude_mx cfg) + else (OC.exclude_mx opt_cfg) diff --git a/src/DNS.hs b/src/DNS.hs new file mode 100644 index 0000000..00db178 --- /dev/null +++ b/src/DNS.hs @@ -0,0 +1,107 @@ +module DNS ( + dns_properties, + dns_tests, + lookup_mxs, + normalize ) +where + +import qualified Data.ByteString.Char8 as BS ( + append, + last, + map, + null, + pack ) +import Data.Char ( toLower ) +import Network.DNS ( + Domain, + defaultResolvConf, + lookupMX, + makeResolvSeed, + withResolver ) +import Test.Tasty ( TestTree, testGroup ) +import Test.Tasty.HUnit ( (@?=), testCase ) +import Test.Tasty.QuickCheck ( testProperty ) + +-- Slow since we create the resolver every time. +lookup_mxs :: Domain -> IO [Domain] +lookup_mxs domain = do + default_rs <- makeResolvSeed defaultResolvConf + withResolver default_rs $ \resolver -> do + mxs <- lookupMX resolver domain + return $ case mxs of + Left _ -> [] + Right pairs -> map fst pairs + + +-- | Perform both normalize_case and normalize_root. +normalize :: Domain -> Domain +normalize = normalize_case . normalize_root + +-- | Normalize the given name by appending a trailing dot (the DNS +-- root) if necessary. +-- +normalize_root :: Domain -> Domain +normalize_root d + | BS.null d = BS.pack "." + | BS.last d == '.' = d + | otherwise = d `BS.append` trailing_dot + where + trailing_dot = BS.pack "." + + +-- | Normalize the given name by lowercasing it. +-- +normalize_case :: Domain -> Domain +normalize_case = BS.map toLower + +-- * Tests + +test_normalize_case :: TestTree +test_normalize_case = + testCase desc $ actual @?= expected + where + desc = "normalize_case lowercases DNS names" + expected = BS.pack "example.com" + actual = normalize_case $ BS.pack "ExAmPlE.COM" + +prop_normalize_case_idempotent :: TestTree +prop_normalize_case_idempotent = + testProperty desc $ prop + where + desc = "normalize_case is idempotent" + + prop :: String -> Bool + prop s = (normalize_case . normalize_case) bs == normalize_case bs + where + bs = BS.pack s + +test_normalize_root_adds_dot :: TestTree +test_normalize_root_adds_dot = + testCase desc $ actual @?= expected + where + desc = "normalize_root adds a trailing dot" + expected = BS.pack "example.com." + actual = normalize_root $ BS.pack "example.com" + +prop_normalize_root_idempotent :: TestTree +prop_normalize_root_idempotent = + testProperty desc prop + where + desc = "normalize_root is idempotent" + + prop :: String -> Bool + prop s = (normalize_root . normalize_root) bs == normalize_root bs + where + bs = BS.pack s + +dns_tests :: TestTree +dns_tests = + testGroup "DNS Tests" [ + test_normalize_case, + test_normalize_root_adds_dot ] + +dns_properties :: TestTree +dns_properties = + testGroup "DNS Properties" [ + prop_normalize_case_idempotent, + prop_normalize_root_idempotent ] diff --git a/src/Main.hs b/src/Main.hs new file mode 100644 index 0000000..d1d1ea8 --- /dev/null +++ b/src/Main.hs @@ -0,0 +1,85 @@ +{-# LANGUAGE DoAndIfThenElse #-} +{-# LANGUAGE NoMonomorphismRestriction #-} +module Main +where + +import Data.Maybe ( fromMaybe ) +import Data.Monoid ( (<>) ) +import Data.String.Utils ( join ) +import Database.HDBC ( SqlError(..), handleSql ) +import Database.HDBC.PostgreSQL ( connectPostgreSQL ) +import Database.HDBC.Sqlite3 ( connectSqlite3 ) +import System.Console.CmdArgs ( def ) +import System.Directory ( doesFileExist ) +import System.IO ( hPutStrLn, stderr ) +import CommandLine ( get_args ) +import Configuration ( Configuration(..), merge_optional ) +import qualified OptionalConfiguration as OC ( from_rc ) +import Report ( report ) + + +-- | Construct a connection string (postgres-only, for now) from a +-- 'Configuration'. All of these are optional, at least for +-- Postgres, and so we want to avoid appending e.g. \"host=\" to the +-- connection string if @(host cfg)@ is 'Nothing'. +-- +-- Examples: +-- +-- >>> let default_cfg = def :: Configuration +-- >>> let cfg = default_cfg { host = Just "localhost" } +-- >>> connection_string cfg +-- "host=localhost" +-- >>> let cfg2 = cfg { username = Just "postgres" } +-- >>> connection_string cfg2 +-- "host=localhost user=postgres" +-- +connection_string :: Configuration -> String +connection_string cfg = + trim $ join " " [host_part, port_part, user_part, pw_part, db_part] + where + -- | Strip leading/trailing whitespace, and collapse multiple + -- consecutive spaces into one. + trim :: String -> String + trim = unwords . words + + host_part = let h = fmap ("host=" ++) (host cfg) in fromMaybe "" h + port_part = let p = fmap (("port=" ++) . show) (port cfg) in fromMaybe "" p + user_part = let u = fmap ("user=" ++) (username cfg) in fromMaybe "" u + pw_part = let pw = fmap ("password=" ++) (password cfg) in fromMaybe "" pw + db_part = let db = fmap ("dbname=" ++) (database cfg) in fromMaybe "" db + + +main :: IO () +main = do + rc_cfg <- OC.from_rc + cmd_cfg <- get_args + + -- Merge the config file options with the command-line ones, + -- prefering the command-line ones. + let opt_config = rc_cfg <> cmd_cfg + + -- Update a default config with any options that have been set in + -- either the config file or on the command-line. We initialize + -- logging before the missing parameter checks below so that we can + -- log the errors. + let cfg = (def :: Configuration) `merge_optional` opt_config + + -- If a database name was specified, and that name exists as a file + -- on the system, assume that the user wanted to use SQLite. + handleSql show_sql_error $ do + r <- case (database cfg) of + Nothing -> connectPostgreSQL (connection_string cfg) >>= report cfg + + Just dbname -> do + exists <- doesFileExist dbname + if exists + then connectSqlite3 dbname >>= report cfg + else connectPostgreSQL (connection_string cfg) >>= report cfg + + -- The DB connection is implicitly closed when it gets garbage collected. + putStrLn r + + where + show_sql_error :: SqlError -> IO () + show_sql_error se = hPutStrLn stderr $ + "SQL Error (" ++ (show $ seNativeError se) ++ "): " ++ (seErrorMsg se) diff --git a/src/MxList.hs b/src/MxList.hs new file mode 100644 index 0000000..d79307d --- /dev/null +++ b/src/MxList.hs @@ -0,0 +1,48 @@ +{-# LANGUAGE DeriveDataTypeable #-} + +-- | A newtype around a list of Strings which represent the MXes whose +-- remote forwards we don't report. This is all to avoid an orphan +-- instance of Configured for [String] if we had defined one in +-- e.g. 'OptionalConfiguration'. +-- +module MxList +where + +-- DC is needed only for the DCT.Configured instance of String. +import qualified Data.Configurator as DC() +import qualified Data.Configurator.Types as DCT ( + Configured, + Value( List ), + convert ) +import Data.Data (Data) +import System.Console.CmdArgs.Default (Default(..)) +import Data.Typeable (Typeable) + + +-- | A (wrapper around a) list of MX hostnames. +-- +newtype MxList = + MxList { get_mxs :: [String] } + deriving (Data, Show, Typeable) + + +-- | The default (empty) list of MXes. +instance Default MxList where + def = MxList [] + +instance DCT.Configured MxList where + -- | This allows us to read a MxList object out of a Configurator + -- config file. By default Configurator wouldn't know what to do, + -- so we have to tell it that we expect a list, and if that list + -- has strings in it, we can apply the MxList constructor to + -- it. + convert (DCT.List xs) = + -- mapM gives us a Maybe [String] here. + fmap MxList (mapM convert_string xs) + where + convert_string :: DCT.Value -> Maybe String + convert_string = DCT.convert + + -- If we read anything other than a list of values out of the file, + -- fail. + convert _ = Nothing diff --git a/src/OptionalConfiguration.hs b/src/OptionalConfiguration.hs new file mode 100644 index 0000000..072f25b --- /dev/null +++ b/src/OptionalConfiguration.hs @@ -0,0 +1,139 @@ +{-# LANGUAGE DeriveDataTypeable #-} +{-# LANGUAGE OverloadedStrings #-} + +-- | An OptionalConfiguration is just like a 'Configuration', except +-- all of its fields are optional. The user can set options in two +-- places: the command-line, and a configuration file. Obviously if +-- a parameter is set in one place, it doesn't need to be set in the +-- other. Thus, the latter needs to be optional. +-- + +module OptionalConfiguration ( + OptionalConfiguration(..), + from_rc, + merge_maybes ) +where + +import qualified Data.Configurator as DC ( + Worth(Optional), + load, + lookup ) + +import Data.Maybe ( fromMaybe ) +import Data.Monoid ( Monoid(..) ) +import Data.Data ( Data ) +import Data.Typeable ( Typeable ) +import Paths_list_remote_forwards ( getSysconfDir ) +import System.Directory ( getHomeDirectory ) +import System.FilePath ( () ) +import System.IO.Error ( catchIOError ) + +import MxList ( MxList(..) ) + +-- | The same as Configuration, except everything is optional. It's easy to +-- merge two of these by simply dropping the Nothings in favor of +-- the Justs. The 'feed_hosts' are left un-maybed so that cmdargs +-- can parse more than one of them. +-- +data OptionalConfiguration = + OptionalConfiguration { + database :: Maybe String, + domain_query :: Maybe String, + exclude_mx :: MxList, + forward_query :: Maybe String, + host :: Maybe String, + password :: Maybe String, + port :: Maybe Int, + username :: Maybe String } + deriving (Show, Data, Typeable) + + +-- | Combine two Maybes into one, essentially mashing them +-- together. We give precedence to the second argument when both are +-- Justs. +merge_maybes :: (Maybe a) -> (Maybe a) -> (Maybe a) +merge_maybes Nothing Nothing = Nothing +merge_maybes (Just x) Nothing = Just x +merge_maybes Nothing (Just x) = Just x +merge_maybes (Just _) (Just y) = Just y + + +-- | The Monoid instance for these lets us "combine" two +-- OptionalConfigurations. The "combine" operation that we'd like to +-- perform is, essentially, to mash them together. So if we have two +-- OptionalConfigurations, each half full, we could combine them +-- into one big one. +-- +-- This is used to merge command-line and config-file settings. +-- +instance Monoid OptionalConfiguration where + -- | An empty OptionalConfiguration. + mempty = OptionalConfiguration + Nothing + Nothing + (MxList []) + Nothing + Nothing + Nothing + Nothing + Nothing + + -- | Combine @cfg1@ and @cfg2@, giving precedence to @cfg2@. + cfg1 `mappend` cfg2 = + OptionalConfiguration + (merge_maybes (database cfg1) (database cfg2)) + (merge_maybes (domain_query cfg1) (domain_query cfg2)) + all_excluded_mx + (merge_maybes (forward_query cfg1) (forward_query cfg2)) + (merge_maybes (host cfg1) (host cfg2)) + (merge_maybes (password cfg1) (password cfg2)) + (merge_maybes (port cfg1) (port cfg2)) + (merge_maybes (username cfg1) (username cfg2)) + where + -- Use only the latter exclude_mx if there are any. + all_excluded_mx = + exclude_mx $ if (null (get_mxs $ exclude_mx cfg2)) + then cfg1 + else cfg2 + + +-- | Obtain an OptionalConfiguration from list-remote-forwardsrc in +-- either the global configuration directory or the user's home +-- directory. The one in $HOME is prefixed by a dot so that it is +-- hidden. +-- +-- We make an attempt at cross-platform compatibility; we will try +-- to find the correct directory even on Windows. But if the calls +-- to getHomeDirectory/getSysconfDir fail for whatever reason, we +-- fall back to using the Unix-specific /etc and $HOME. +-- +from_rc :: IO OptionalConfiguration +from_rc = do + etc <- catchIOError getSysconfDir (\e -> do + putStrLn $ "ERROR: " ++ (show e) + return "/etc") + home <- catchIOError getHomeDirectory (\e -> do + putStrLn $ "ERROR: " ++ (show e) + return "$(HOME)") + let global_config_path = etc "list-remote-forwardsrc" + let user_config_path = home ".list-remote-forwardsrc" + cfg <- DC.load [ DC.Optional global_config_path, + DC.Optional user_config_path ] + cfg_database <- DC.lookup cfg "database" + cfg_domain_query <- DC.lookup cfg "domain_query" + cfg_exclude_mx <- DC.lookup cfg "exclude_mx" + cfg_forward_query <- DC.lookup cfg "forward_query" + cfg_host <- DC.lookup cfg "host" + cfg_password <- DC.lookup cfg "password" + cfg_port <- DC.lookup cfg "port" + cfg_username <- DC.lookup cfg "username" + + return $ OptionalConfiguration + cfg_database + cfg_domain_query + (fromMaybe (MxList []) cfg_exclude_mx) + cfg_forward_query + cfg_host + cfg_password + cfg_port + cfg_username diff --git a/src/Report.hs b/src/Report.hs new file mode 100644 index 0000000..b15da98 --- /dev/null +++ b/src/Report.hs @@ -0,0 +1,157 @@ +{-# LANGUAGE PatternGuards #-} + +module Report ( + report, + report_tests ) +where + +import Control.Monad ( filterM ) +import qualified Data.ByteString.Char8 as BS ( pack ) +import Data.Maybe ( catMaybes, listToMaybe ) +import Data.String.Utils ( join, split, strip ) +import Database.HDBC ( + IConnection, + execute, + prepare, + sFetchAllRows') +import Database.HDBC.Sqlite3 ( connectSqlite3 ) +import Data.List ( (\\) ) +import System.Console.CmdArgs.Default ( Default(..) ) +import Test.Tasty ( TestTree, testGroup ) +import Test.Tasty.HUnit ( (@?=), testCase ) + +import Configuration ( Configuration(..) ) +import DNS ( lookup_mxs, normalize ) +import MxList ( MxList(..) ) + +-- Type synonyms to make the signatures below a little more clear. +type Domain = String +type Address = String +type Goto = String + +data Forward = + Forward Address Goto + deriving (Show) + +get_domain_list :: IConnection a => a -> String -> IO [Domain] +get_domain_list conn query = do + stmt <- prepare conn query + + -- We really want executeRaw here, but there's a bug: it will tell + -- us we can't fetch rows from the statement since it hasn't been + -- executed yet! + _ <- execute stmt [] + + -- rows :: [[Maybe String]] + rows <- sFetchAllRows' stmt + + -- rows' :: [Maybe String] + let rows' = map (listToMaybe . catMaybes) rows + + -- domains :: [String] + let domains = catMaybes rows' + + return domains + + +get_forward_list :: IConnection a => a -> String -> IO [Forward] +get_forward_list conn query = do + stmt <- prepare conn query + + -- We really want executeRaw here, but there's a bug: it will tell + -- us we can't fetch rows from the statement since it hasn't been + -- executed yet! + _ <- execute stmt [] + + -- rows :: [[Maybe String]] + rows <- sFetchAllRows' stmt + + -- forwards :: [Forward] + let forwards = concatMap (row_to_forwards . catMaybes) rows + + return forwards + where + row_to_forwards :: [String] -> [Forward] + row_to_forwards (addr:gotos:_) = + [Forward addr (strip g) | g <- split "," gotos] + row_to_forwards _ = [] + + + +find_remote_forwards :: [Domain] -> [Forward] -> [Forward] +find_remote_forwards domains forwards = + filter is_remote forwards + where + is_remote :: Forward -> Bool + is_remote (Forward _ goto) = + let parts = split "@" goto + in + case parts of + (_:dp:[]) -> not $ dp `elem` domains + _ -> True -- Assume it's remote if something is wrong + + +format_forward :: Forward -> String +format_forward (Forward addr goto) = + addr ++ " -> " ++ goto + + +-- If the MX records for a domain are exactly those contained in the +-- MxList, then we exclude that domain from the report. Splitting on +-- the '@' is a lazy way of obtaining the domain, but if it's good +-- enough for determining that a forward is remote, then it's good +-- enough for this. +filter_by_mx :: MxList -> [Forward] -> IO [Forward] +-- This special case is necessary! Otherwise if we have an empty +-- exclude list and a domain that has no MX record, it will be +-- excluded. +filter_by_mx (MxList []) = return +filter_by_mx (MxList mxs) = + filterM all_mxs_excluded + where + all_mxs_excluded :: Forward -> IO Bool + all_mxs_excluded (Forward addr _) = + case (split "@" addr) of + (_:domain_part:[]) -> do + fw_mxs <- lookup_mxs (BS.pack domain_part) + let norm_mxs = map (normalize . BS.pack) mxs + if (norm_mxs \\ fw_mxs) == [] then return False else return True + _ -> return True -- Report it if we can't figure out the domain. + + +-- | Given a connection and a 'Configuration', produces the report as +-- a 'String'. +-- +report :: IConnection a => Configuration -> a -> IO String +report cfg conn = do + domains <- get_domain_list conn (domain_query cfg) + forwards <- get_forward_list conn (forward_query cfg) + + valid_forwards <- filter_by_mx (exclude_mx cfg) forwards + let remote_forwards = find_remote_forwards domains valid_forwards + let forward_strings = map format_forward remote_forwards + + return $ (join "\n" forward_strings) ++ "\n" + + + +-- * Tests + +report_tests :: TestTree +report_tests = + testGroup "Report Tests" [ test_example1 ] + + +test_example1 :: TestTree +test_example1 = + testCase desc $ do + conn <- connectSqlite3 "test/fixtures/postfixadmin.sqlite3" + let cfg = def :: Configuration + actual <- report cfg conn + actual @?= expected + where + desc = "all remote forwards are found" + expected = "user1@example.com -> user1@example.net\n" ++ + "user2@example.com -> user1@example.org\n" ++ + "user2@example.com -> user2@example.org\n" ++ + "user2@example.com -> user3@example.org\n" diff --git a/test/TestSuite.hs b/test/TestSuite.hs new file mode 100644 index 0000000..fc58bd8 --- /dev/null +++ b/test/TestSuite.hs @@ -0,0 +1,12 @@ +import Test.Tasty ( TestTree, defaultMain, testGroup ) + +import DNS ( dns_properties, dns_tests ) +import Report ( report_tests ) + +tests :: TestTree +tests = testGroup "All tests" [ dns_properties, + dns_tests, + report_tests ] + +main :: IO () +main = defaultMain tests diff --git a/test/fixtures/postfixadmin.sqlite3 b/test/fixtures/postfixadmin.sqlite3 new file mode 100644 index 0000000..38f39ee Binary files /dev/null and b/test/fixtures/postfixadmin.sqlite3 differ