Need JavaScript's 'isInNet()' in Java

You'd need to start with http://java.sun.com/javase/6/docs/api/java/net/InetAddress.html#getAllByName(java.lang.String) and handle the netmask yourself

Haven't looked at this closely but relevant stuff here:

http://js.ibex.org/src/org/ibex/js/ProxyAutoConfig.java

thanks CEHJ, BUT:

1. the InetAdress API descriptions shows no occurences of mask or range an does not mention any subnet operations.

2. ProxyAutoConfig simply shows an implementation. I did not want to implement it by myself.
By the way: this implementation fails for IPV6.

1. Yes, that's why i said:

>>and handle the netmask yourself

2. I realise that. I posted the link as there's relevant code in there

theres nothing that i am aware of, you would probably need to implement it yourself.
I'll ask around and see if anyone knows of anything.

1. This might do it:

http://lenya.apache.org/apidocs/2.0/org/apache/lenya/net/InetAddressUtil.html#contains(java.net.InetAddress,%20java.net.InetAddress,%20java.net.InetAddress)

nothing exists ready to use sorry, the best someone could offer was some internal code from sun (which I haven't even looked at). Posting it here in case it helps

    public boolean isInNet(String host, String pattern, String mask) {
        // int count= number of 255's in mask
        int count = 0;
        int startPos = 0;
        while ((startPos = mask.indexOf("255", startPos + 1)) > -1)
            count++;

        // String tokenize host and pattern with "." as delimeter
        StringTokenizer hostTok = new StringTokenizer(host, ".");
        StringTokenizer patternTok = new StringTokenizer(pattern, ".");

        for (int i = 0; i <= count; i++) {
            if ((!hostTok.hasMoreTokens()) || (!patternTok.hasMoreTokens()))
                return false;
            if (!(hostTok.nextToken()).equals(patternTok.nextToken())) {
                return false;
            }
        }
        return true;

        // compare count times the tokens of host and pattern

        // default impl as per browser's Java Plugin
        // return false;

    }

(Though sun's plugin implementation was been broken prior to java6)

@objects: again: I don't need implementation suggestions - I can do that myself. But then I have to take care myself about changes in network addressing (IPV6 as most prominent example). I really can't believe, that in twelve years of Java nobody addressed that lack of functionality in java.net.


@CEHJ: thanks. That comes very near to what I'm looking for. But lenya seems to be quite big for that specific use case. Is there any other significally smaller commonly accepted library which supplies an equivalent functionallity?

realised that, but as there isn't anything available thought I'd mention it.
If you're needing it in a browser environment then you could use the js version.
Sun does have it own implementation but just uses it internally in the plugin.

that lenya code is also busted.

unbelievable: even the apache commons-net seems to get that functionality late with the upcoming version 2.0. And that fresh feature ist not able to handle IPV6.

Overall, Apache's commons-net-2.0 is an acceptable solution, regarding to my initial question. Thanks to all.

PS: maybe I'll write some code myself and publish it.

:-)