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(* Copyright (C) 2002-2006, 2008 Henry Cejtin, Matthew Fluet, Suresh
* Jagannathan, and Stephen Weeks.
*
* MLton is released under a HPND-style license.
* See the file MLton-LICENSE for details.
*)
structure NetHostDB: NET_HOST_DB_EXTRA =
struct
structure Prim = PrimitiveFFI.NetHostDB
(* network byte order (big-endian) *)
type pre_in_addr = Word8.word array
type in_addr = Word8.word vector
val preInAddrToWord8Array = fn a => a
val inAddrToWord8Vector = fn v => v
val inAddrLen = C_Size.toInt Prim.inAddrSize
fun newInAddr () =
let
val ia: pre_in_addr = Array.array (inAddrLen, 0wx0: Word8.word)
fun finish () = Array.vector ia
in
(ia, finish)
end
fun any () =
let
val (wa, finish) = newInAddr ()
fun loop (i, acc) =
if i >= inAddrLen
then ()
else let
val w = Word8.castFromSysWord (C_Int.castToSysWord acc)
val () =
Array.update
(wa, (inAddrLen - 1) - i, w)
in
loop (i + 1, C_Int.>> (acc, 0w4))
end
in
loop (0, Prim.INADDR_ANY)
; finish ()
end
structure AddrFamily = Net.AddrFamily
type addr_family = AddrFamily.t
datatype entry = T of {name: string,
aliases: string list,
addrType: addr_family,
addrs: in_addr list}
local
fun make s (T r) = s r
in
val name = make #name
val aliases = make #aliases
val addrType = make #addrType
val addrs = make #addrs
end
fun addr entry = hd (addrs entry)
local
fun get (i: C_Int.t): entry option =
if i <> C_Int.zero
then let
val name = CUtil.C_String.toString (Prim.getEntryName ())
val numAliases = Prim.getEntryAliasesNum ()
fun fill (n, aliases) =
if C_Int.< (n, numAliases)
then let
val alias =
CUtil.C_String.toString (Prim.getEntryAliasesN n)
in
fill (C_Int.+ (n, 1), alias::aliases)
end
else List.rev aliases
val aliases = fill (0, [])
val addrType = Prim.getEntryAddrType ()
val length = Prim.getEntryLength ()
val numAddrs = Prim.getEntryAddrsNum ()
fun fill (n, addrs) =
if C_Int.< (n, numAddrs)
then let
val addr = Word8Array.array (C_Int.toInt length, 0wx0)
val _ = Prim.getEntryAddrsN (n, Word8Array.toPoly addr)
val addr = Word8Vector.toPoly (Word8Array.vector addr)
in
fill (C_Int.+ (n, 1), addr::addrs)
end
else List.rev addrs
val addrs = fill (0, [])
in
SOME (T {name = name,
aliases = aliases,
addrType = AddrFamily.fromRep addrType,
addrs = addrs})
end
else NONE
in
fun getByAddr in_addr =
get (Prim.getByAddress (in_addr, C_Socklen.fromInt (Vector.length in_addr)))
fun getByName name =
get (Prim.getByName (NullString.nullTerm name))
end
fun getHostName () =
let
val n = 128
val buf = CharArray.array (n, #"\000")
val () =
Posix.Error.SysCall.simple
(fn () => Prim.getHostName (CharArray.toPoly buf, C_Size.fromInt n))
in
case CharArray.findi (fn (_, c) => c = #"\000") buf of
NONE => CharArray.vector buf
| SOME (i, _) =>
CharArraySlice.vector (CharArraySlice.slice (buf, 0, SOME i))
end
fun scan reader state =
let
fun scanW state =
case reader state of
SOME (#"0", state') =>
(case reader state' of
NONE => SOME (0w0, state')
| SOME (c, state'') =>
if Char.isDigit c
then StringCvt.wdigits StringCvt.OCT reader state'
else if c = #"x" orelse c = #"X"
then StringCvt.wdigits StringCvt.HEX reader state''
else SOME (0w0, state'))
| _ => StringCvt.wdigits StringCvt.DEC reader state
fun loop (n, state, acc) =
if n <= 0
then List.rev acc
else let
fun finish (w, state) =
case reader state of
SOME (#".", state') =>
loop (n - 1, state', (w, state)::acc)
| _ => List.rev ((w, state)::acc)
in
case scanW state of
SOME (w, state') => finish (w, state')
| NONE => List.rev acc
end
val l = loop (4, state, [])
fun get1 w =
(Word8.fromLarge (Word.toLarge (Word.andb (w, 0wxFF))),
Word.>>(w, 0w8))
fun get2 w =
let
val (a,w) = get1 w
val (b,w) = get1 w
in (a,b,w)
end
fun get3 w =
let
val (a,b,w) = get2 w
val (c,w) = get1 w
in (a,b,c,w)
end
fun get4 w =
let
val (a,b,c,w) = get3 w
val (d,w) = get1 w
in (a,b,c,d,w)
end
fun try l =
case l of
[] => NONE
| [(w, statew)] =>
let
val (d,c,b,a,w) = get4 w
in
if w = 0wx0
then SOME (Vector.fromList [a,b,c,d], statew)
else NONE
end
| [(x, statex), (w, statew)] =>
let
val (d,c,b,w) = get3 w
val (a,x) = get1 x
in
if w = 0wx0 andalso x = 0wx0
then SOME (Vector.fromList [a,b,c,d], statew)
else try [(x, statex)]
end
| [(y, statey), (x, statex), (w, statew)] =>
let
val (d,c,w) = get2 w
val (b,x) = get1 x
val (a,y) = get1 y
in
if w = 0wx0 andalso x = 0wx0 andalso y = 0wx0
then SOME (Vector.fromList [a,b,c,d], statew)
else try [(y, statey), (x, statex)]
end
| [(z, statez), (y, statey), (x, statex), (w, statew)] =>
let
val (d,w) = get1 w
val (c,x) = get1 x
val (b,y) = get1 y
val (a,z) = get1 z
in
if w = 0wx0 andalso x = 0wx0 andalso y = 0wx0 andalso z = 0wx0
then SOME (Vector.fromList [a,b,c,d], statew)
else try [(z, statez), (y, statey), (x, statex)]
end
| _ => NONE
in
try l
end
fun fromString s = StringCvt.scanString scan s
fun toString in_addr =
String.concatWith "."
(Vector.foldr (fn (w,ss) => (Word8.fmt StringCvt.DEC w)::ss) [] in_addr)
end
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