blob: 12343d99bc46529998d205110d6b38700fdd7e5e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
module Network.DNS.Query (composeQuery) where
import qualified Data.ByteString.Lazy.Char8 as BL (ByteString)
import qualified Data.ByteString.Char8 as BS (length, split, unpack, null)
import Data.Char
import Network.DNS.StateBinary
import Network.DNS.Internal
import Data.Monoid
(+++) :: Monoid a => a -> a -> a
(+++) = mappend
----------------------------------------------------------------
composeQuery :: Int -> [Question] -> BL.ByteString
composeQuery idt qs = runSPut (encodeQuery qry)
where
hdr = header defaultQuery
qry = defaultQuery {
header = hdr {
identifier = idt
, qdCount = length qs
}
, question = qs
}
----------------------------------------------------------------
encodeQuery :: DNSFormat -> SPut
encodeQuery fmt = encodeHeader hdr
+++ encodeQuestion qs
where
hdr = header fmt
qs = question fmt
encodeHeader :: DNSHeader -> SPut
encodeHeader hdr = encodeIdentifier (identifier hdr)
+++ encodeFlags (flags hdr)
+++ decodeQdCount (qdCount hdr)
+++ decodeAnCount (anCount hdr)
+++ decodeNsCount (nsCount hdr)
+++ decodeArCount (arCount hdr)
where
encodeIdentifier = putInt16 . fromIntegral
decodeQdCount = putInt16 . fromIntegral
decodeAnCount = putInt16 . fromIntegral
decodeNsCount = putInt16 . fromIntegral
decodeArCount = putInt16 . fromIntegral
encodeFlags :: DNSFlags -> SPut
encodeFlags _ = put16 0x0100 -- xxx
encodeQuestion :: [Question] -> SPut
encodeQuestion qs = encodeDomain dom
+++ putInt16 (fromIntegral (typeToInt typ))
+++ put16 1
where
q = head qs
dom = qname q
typ = qtype q
----------------------------------------------------------------
encodeDomain :: Domain -> SPut
encodeDomain dom = foldr (+++) (put8 0) (map encodeSubDomain $ zip ls ss)
where
ss = filter (not . BS.null) $ BS.split '.' dom
ls = map BS.length ss
encodeSubDomain (len,sub) = putInt8 (fromIntegral len)
+++ foldr (+++) mempty (map (putInt8 . fromIntegral . ord) (BS.unpack sub))
|
