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/*
 * Copyright (C) 2006-2015 phloc systems
 * http://www.phloc.com
 * office[at]phloc[dot]com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
function dnsDomainIs(host, domain) {
    return (host.length >= domain.length &&
            host.substring(host.length - domain.length) == domain);
}

function dnsDomainLevels(host) {
    return host.split('.').length-1;
}

function convert_addr(ipchars) {
    var bytes = ipchars.split('.');
    var result = ((bytes[0] & 0xff) << 24) |
                 ((bytes[1] & 0xff) << 16) |
                 ((bytes[2] & 0xff) <<  8) |
                  (bytes[3] & 0xff);
    return result;
}

function isInNet(ipaddr, pattern, maskstr) {
    var test = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/(ipaddr);
    if (test == null) {
        ipaddr = dnsResolve(ipaddr);
        if (ipaddr == null)
            return false;
    } else if (test[1] > 255 || test[2] > 255 || 
               test[3] > 255 || test[4] > 255) {
        return false;    // not an IP address
    }
    var host = convert_addr(ipaddr);
    var pat  = convert_addr(pattern);
    var mask = convert_addr(maskstr);
    return ((host & mask) == (pat & mask));
    
}

function isPlainHostName(host) {
    return (host.search('\\.') == -1);
}

function isResolvable(host) {
    var ip = dnsResolve(host);
    return (ip != null);
}

function localHostOrDomainIs(host, hostdom) {
    return (host == hostdom) ||
           (hostdom.lastIndexOf(host + '.', 0) == 0);
}

function shExpMatch(url, pattern) {
   pattern = pattern.replace(/\./g, '\\.');
   pattern = pattern.replace(/\*/g, '.*');
   pattern = pattern.replace(/\?/g, '.');
   var newRe = new RegExp('^'+pattern+'$');
   return newRe.test(url);
}