* "peek named pipe" operation and return the number of available bytes
     * on the server.
     */
    @Override
    public int available () throws IOException {
        return 0;
    }


    /**
     * Skip n bytes of data on this stream. This operation will not result
     * in any IO with the server. Unlink <tt>InputStream</tt> value less than

 * This can be a problem if using DFS in it's default configuration as they still return referrals in short form.
 * See <a href="https://support.microsoft.com/en-us/kb/244380">KB-244380</a> for compatible server configuration.
 * See {@link jcifs.Configuration#isDfsConvertToFQDN()} for a workaround.
 */
public class Kerb5Authenticator extends NtlmPasswordAuthenticator {

        if ( locator.getType() != SmbConstants.TYPE_SERVER )
            throw new SmbException("The requested list operations is invalid: " + u.toString());

        Set<FileEntry> set = new HashSet<>();

        if ( tc.getDfs().isTrustedDomain(tc, locator.getServer()) ) {
            /*
             * The server name is actually the name of a trusted
             * domain. Add DFS roots to the list.

     *            authentication). If false and the user has not been authenticated yet
     *            the client will be forced to send an authentication (server sends
     *            HttpServletResponse.SC_UNAUTHORIZED).
     * @return True if the negotiation is complete, otherwise false
     * @throws ServletException
     */

        return getConfigs("smb1", "smb2", "smb30", "smb31");
    }


    private String getTestDfsTargetServer () {
        String dfsTargetServer = getProperties().get("test.server.dfs");
        if ( dfsTargetServer != null ) {
            return dfsTargetServer;
        }
        return getTestServer();
    }


    private String getTestDC () {

            /*
             * A word about communicating header info to andx smbs
             *
             * This is where we recursively invoke the provided andx smb
             * object to write it's parameter words and bytes to our outgoing
             * array. Incedentally when these andx smbs are created they are not
             * necessarily populated with header data because they're not writing

    static final int NBSTAT = 0x0021;
    static final int IN = 0x0001;
    static final int A = 0x0001;
    static final int NS = 0x0002;
    static final int NULL = 0x000a;

    static final int HEADER_LENGTH = 12;

    // header field offsets
    static final int OPCODE_OFFSET = 2;
    static final int QUESTION_OFFSET = 4;
    static final int ANSWER_OFFSET = 6;
    static final int AUTHORITY_OFFSET = 8;

    /**
     * @param fullName
     *            the fullName to set
     */
    @Override
    public void setFullUNCPath ( String domain, String server, String fullName ) {
        this.domain = domain;
        this.server = server;
        this.fullName = fullName;
    }


    /**
     * {@inheritDoc}
     * 
     * Strips a leading \
     *

        if (server.signaturesRequired || (server.signaturesEnabled && SIGNPREF)) {
            flags2 |= ServerMessageBlock.FLAGS2_SECURITY_SIGNATURES;
        } else {
            flags2 &= 0xFFFF ^ ServerMessageBlock.FLAGS2_SECURITY_SIGNATURES;
        }
        maxMpxCount = Math.min( maxMpxCount, server.maxMpxCount );
        if (maxMpxCount < 1) maxMpxCount = 1;
        snd_buf_size = Math.min( snd_buf_size, server.maxBufferSize );

        return this.server;
    }


    /**
     * 
     * {@inheritDoc}
     *
     * @see jcifs.internal.RequestWithPath#setFullUNCPath(java.lang.String, java.lang.String, java.lang.String)
     */
    @Override
    public void setFullUNCPath ( String domain, String server, String fullPath ) {
        this.domain = domain;
        this.server = server;
        this.fullPath = fullPath;