X-Git-Url: https://git.hcoop.net/hcoop/domtool2.git/blobdiff_plain/113d72170910c3dd0e9b49c6b46a8ae42df66ab8..090692f732336ea1d094032821fa121cb54078c4:/src/domain.sml

diff --git a/src/domain.sml b/src/domain.sml
index 94eb077..8384f85 100644
--- a/src/domain.sml
+++ b/src/domain.sml
@@ -80,6 +80,36 @@ fun validIp s =
 	n1 >= 0 andalso n1 < 256 andalso n2 >= 0 andalso n2 < 256 andalso n3 >= 0 andalso n3 < 256 andalso n4 >= 0 andalso n4 < 256
       | _ => false
 
+fun isHexDigit ch = Char.isDigit ch orelse (ord ch >= ord #"a" andalso ord ch <= ord #"f")
+
+fun validIpv6 s =
+    let
+	val fields = String.fields (fn ch => ch = #":") s
+
+	val empties = foldl (fn ("", n) => n + 1
+			      | (_, n) => n) 0 fields
+
+	fun noIpv4 maxLen =
+	    length fields >= 2
+	    andalso length fields <= maxLen
+	    andalso empties <= 1
+	    andalso List.all (fn "" => true
+			       | s => size s <= 4
+				      andalso CharVector.all isHexDigit s) fields
+
+	fun hasIpv4 () =
+	    length fields > 0
+	    andalso
+	    let
+		val maybeIpv4 = List.last fields
+		val theRest = List.take (fields, length fields - 1)
+	    in
+		validIp maybeIpv4 andalso noIpv4 6
+	    end
+    in
+	noIpv4 8 orelse hasIpv4 ()
+    end
+
 fun isIdent ch = Char.isLower ch orelse Char.isDigit ch
 
 fun validHost s =
@@ -143,6 +173,10 @@ val _ = Env.type_one "ip"
 	Env.string
 	validIp
 
+val _ = Env.type_one "ipv6"
+	Env.string
+	validIpv6
+
 val _ = Env.type_one "host"
 	Env.string
 	validHost