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/*
 * Copyright (C) 2006-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see .
 */

package org.filesys.server.auth.acl;

import java.net.InetAddress;

import org.filesys.server.SrvSession;
import org.filesys.server.core.SharedDevice;
import org.filesys.util.IPAddress;

/**
 * Ip Address Access Control Class
 *
 * Allow/disallow access by checking for a particular TCP/IP address or checking that the address is within
 * a specified subnet.
 *
 * @author gkspencer
 */
public class IpAddressAccessControl extends AccessControl {

    //	Subnet and network mask if the address specifies the subnet
    private String m_subnet;
    private String m_netMask;

    /**
     * Class constructor
     *
     * @param address String
     * @param mask    String
     * @param type    String
     * @param access  int
     */
    public IpAddressAccessControl(String address, String mask, String type, int access) {
        super(address, type, access);

        //	Save the subnet and network mask, if specified
        m_subnet = address;
        m_netMask = mask;

        //	Change the rule name if a network mask has been specified
        if (m_netMask != null)
            setName(m_subnet + "/" + m_netMask);
    }

    /**
     * Check if the TCP/IP address matches the specifed address or is within the subnet.
     *
     * @param sess  SrvSession
     * @param share SharedDevice
     * @param mgr   AccessControlManager
     * @return int
     */
    public int allowsAccess(SrvSession sess, SharedDevice share, AccessControlManager mgr) {

        //	Check if the remote address is set for the session
        InetAddress remoteAddr = sess.getRemoteAddress();

        if (remoteAddr == null)
            return Default;

        //	Get the remote address as a numeric IP address string
        String ipAddr = remoteAddr.getHostAddress();

        //	Check if the access control is a single TCP/IP address check
        int sts = Default;

        if (m_netMask == null) {

            //	Check if the TCP/IP address matches the check address
            if( IPAddress.isIPv4Address( ipAddr) && IPAddress.isIPv4Address( m_subnet)) {
                if (IPAddress.parseNumericAddress(ipAddr) == IPAddress.parseNumericAddress(getName()))
                    sts = getAccess();
            }
            else if ( IPAddress.isIPv6Address( ipAddr) && IPAddress.isIPv6Address( m_subnet)) {

                // Strip the scope index
                int idx = ipAddr.indexOf( '%');
                if ( idx != -1)
                    ipAddr = ipAddr.substring( 0, idx);

                if ( ipAddr.equalsIgnoreCase( m_subnet))
                    sts = getAccess();
            }
        } else {

            //	Check if the address is within the subnet range
            if (IPAddress.isInSubnet(ipAddr, m_subnet, m_netMask) == true)
                sts = getAccess();
        }

        //	Return the access status
        return sts;
    }
}