org.jinterop.dcom.core.JISecurityBinding Maven / Gradle / Ivy

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/** j-Interop (Pure Java implementation of DCOM protocol)
 * Copyright (C) 2006  Vikram Roopchand
 *
 * This library 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 3.0 of the License, or (at your option) any later version.
 *
 * Though a sincere effort has been made to deliver a professional,
 * quality product,the library itself is distributed WITHOUT ANY WARRANTY;
 * 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 this library; if not, write to the Free Software
 * Foundation Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 */
package org.jinterop.dcom.core;

import java.io.Serializable;
import ndr.NetworkDataRepresentation;

final class JISecurityBinding implements Serializable {

    private static final long serialVersionUID = 2100264431889577123L;

    private JISecurityBinding() {
    }

    public static final int COM_C_AUTHZ_NONE = 0xffff;
    private int authnSvc = 0;  // Cannot be zero.
    private int authzSvc = 0;  // Must not be zero.
    private String princName = null; // Zero terminated.
    private int length = -1;

    public int getLength() {
        return length;
    }

    JISecurityBinding(int authnSvc, int authzSvc, String princName) {
        this.authnSvc = authnSvc;
        this.authzSvc = authzSvc;
        this.princName = princName;
        if (princName.isEmpty()) {
            length = 2 + 2 + 2;
        } else {
            length = 2 + 2 + princName.length() * 2 + 2;
        }
    }

    static JISecurityBinding decode(NetworkDataRepresentation ndr) {
        JISecurityBinding securityBinding = new JISecurityBinding();

        securityBinding.authnSvc = ndr.readUnsignedShort();

        if (securityBinding.authnSvc == 0) {
            //security binding over.
            return null;
        }

        securityBinding.authzSvc = ndr.readUnsignedShort();

        //now to read the String till a null termination character.
        // a '0' will be represented as 30
        int retVal = -1;
        StringBuilder buffer = new StringBuilder();
        while ((retVal = ndr.readUnsignedShort()) != 0) {
            //even though this is a unicode string , but will not have anything else
            //other than ascii charset, which is supported by all encodings.
            buffer.append(new String(new byte[]{(byte) retVal}));
        }

        securityBinding.princName = buffer.toString();

        // 2 bytes for authnsvc, 2 for authzsvc , each character is 2 bytes (short) and last 2 bytes for null termination
        securityBinding.length = 2 + 2 + securityBinding.princName.length() * 2 + 2;

        return securityBinding;
    }

    public void encode(NetworkDataRepresentation ndr) {
        ndr.writeUnsignedShort(authnSvc);
        ndr.writeUnsignedShort(authzSvc);

        //now to write the network address.
        int i = 0;
        while (i < princName.length()) {
            ndr.writeUnsignedShort(princName.charAt(i));
            i++;
        }

        ndr.writeUnsignedShort(0); //null termination

    }
}