support powerdns ABI v.4 (#1386)

[pdns-pipe-nmc.git] / pdns-pipe-nmc.hs

diff --git a/pdns-pipe-nmc.hs b/pdns-pipe-nmc.hs
index 8f26fa72864557e48b0bf04c16af4dd54068bfaf..1f5a8918675d40f34ce66b49d59ae88c2e2df90c 100644 (file)
--- a/pdns-pipe-nmc.hs
+++ b/pdns-pipe-nmc.hs
@@ -1,9 +1,11 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 module Main where
 
 import Prelude hiding (lookup, readFile)
 import System.Environment
+import System.Console.GetOpt
 import System.IO hiding (readFile)
 import System.IO.Error
 import Data.Time.Clock.POSIX
@@ -20,7 +22,11 @@ import Data.Map.Lazy (Map, empty, lookup, insert, delete, size)
 import Data.Aeson (encode, decode, Value(..))
 import Network.HTTP.Types
 import Network.HTTP.Client
+#if MIN_VERSION_http_client(0,3,0)
+import Data.Default.Class (def)
+#else
 import Data.Default (def)
+#endif
 
 import JsonRpcClient
 import Config
@@ -78,7 +84,7 @@ queryDom queryOp fqdn =
 -- Yet another - to use (const - expires_in) from the lookup.
 nmcAge = fmap (\x -> floor ((x - 1303070400) / 600)) getPOSIXTime
 
--- Main entries
+-- run a PowerDNS coprocess. Negotiate ABI version and execute requests.
 
 mainPdnsNmc = do
 
@@ -98,6 +104,7 @@ mainPdnsNmc = do
       ["HELO", "1"] -> return 1
       ["HELO", "2"] -> return 2
       ["HELO", "3"] -> return 3
+      ["HELO", "4"] -> return 4
       ["HELO",  x ] -> loopErr $ "unsupported ABI version " ++ (show x)
       _             -> loopErr $ "bad HELO " ++ (show s)
 
@@ -127,6 +134,7 @@ mainPdnsNmc = do
             PdnsRequestQ qname qtype id _ _ _ -> do
               io $ queryDom (queryOpNmc cfg mgr id) qname
                      >>= putStr . (pdnsOutQ ver count gen qname qtype)
+  {-
   -- debug
               io $ putStrLn $ "LOG\tRequest number " ++ (show count)
                            ++ " id: " ++ (show id)
@@ -134,15 +142,28 @@ mainPdnsNmc = do
                            ++ " qtype: " ++ (show qtype)
                            ++ " cache size: " ++ (show (size cache))
   -- end debug
+  -}
               put $ stow qname (count, cache)
-            PdnsRequestAXFR xrq ->
-              case fetch xrq cache of
-                Nothing ->
-                  io $ putStr $
-                    pdnsReport ("AXFR for unknown id: " ++ (show xrq))
+            PdnsRequestAXFR xrq zid -> do
+  {-
+  -- debug
+              io $ putStrLn $ "LOG\tAXFR request id=" ++ (show xrq)
+                                ++ ", zone name: " ++ (show zid)
+  -- end debug
+  -}
+              let
+                czone = fetch xrq cache
+                zone = case zid of
+                  Nothing    -> czone
+                  Just qname -> Just qname
+                    -- if zid == czone then zid else Nothing -- paranoid
+              case zone of
                 Just qname ->
                   io $ queryDom (queryOpNmc cfg mgr xrq) qname
-                    >>= putStr . (pdnsOutXfr ver count gen qname)
+                     >>= putStr . (pdnsOutXfr ver count gen qname)
+                Nothing ->
+                  io $ putStr $ pdnsReport $ "AXFR cannot determine zone: "
+                                          ++ (show xrq) ++ ", " ++ (show zid)
             PdnsRequestPing -> io $ putStrLn "END"
 
   runStateT mainloop (0, empty) >> return ()
@@ -154,7 +175,7 @@ pdnsOut gen key qt dom =
     "AXFR" -> pdnsOutXfr 1 (-1) gen key dom
     _      -> pdnsOutQ 1 (-1) gen key (rrType qt) dom
 
--- query by key from Namecoin
+-- run one query by key from Namecoin, print domain object and answer
 
 mainOne gen key qt = do
   cfg <- readConfig confFile
@@ -163,7 +184,7 @@ mainOne gen key qt = do
   putStrLn $ ppShow dom
   putStr $ pdnsOut gen key qt dom
 
--- using file backend for testing json domain data
+-- get data from the file, print domain object and answer
 
 mainFile gen key qt = do
   dom <- queryDom queryOpFile key
@@ -175,8 +196,12 @@ mainFile gen key qt = do
 main = do
   args <- getArgs
   gen <- nmcAge
+  let
+    with f xs = case xs of
+      [qfqdn, qtype]       -> f gen qfqdn qtype
+      _ -> error $ "usage: empty args, or \"[-f] <fqdn> {<TYPE>|ANY|AXFR}\""
+                ++ " (type in caps)"
   case args of
-    []                 -> mainPdnsNmc
-    [key, qtype]       -> mainOne gen key qtype
-    ["-f" ,key, qtype] -> mainFile gen key qtype
-    _ -> error $ "usage: empty args, or \"[-f] <fqdn> {<TYPE>|ANY|AXFR}\" (type in caps)"
+    []      -> mainPdnsNmc
+    "-f":xs -> with mainFile xs
+    _       -> with mainOne args