public byte[] getChallenge ( CIFSContext tf, Address dc ) throws SmbException {
        return getChallenge(tf, dc, 0);
    }


    @Override
    public byte[] getChallenge ( CIFSContext tf, Address dc, int port ) throws SmbException {
        try ( SmbTransportInternal trans = tf.getTransportPool()
                .getSmbTransport(tf, dc, port, false, !tf.getCredentials().isAnonymous() && tf.getConfig().isIpcSigningEnforced())

                            SmbTransportImpl transport = tf.getTransportPool().getSmbTransport(
                                tf,
                                dr.getServer(),
                                0,
                                false,
                                !tf.getCredentials().isAnonymous() && tf.getConfig().isSigningEnabled() && tf.getConfig().isIpcSigningEnforced())

    private static NtlmChallenge interrogate ( CIFSContext tf, Address addr ) throws SmbException {
        UniAddress dc = new UniAddress(addr);
        try ( SmbTransportInternal trans = tf.getTransportPool()
                .getSmbTransport(tf, dc, 0, false, tf.hasDefaultCredentials() && tf.getConfig().isIpcSigningEnforced())
                .unwrap(SmbTransportInternal.class) ) {
            if ( !tf.hasDefaultCredentials() ) {

    /**
     * @param domain
     * @param tf
     * @return whether the given domain is trusted
     * @throws CIFSException
     * @throws jcifs.smb.SmbAuthException
     */
    boolean isTrustedDomain ( CIFSContext tf, String domain ) throws CIFSException;


    /**
     * Get a connection to the domain controller for a given domain
     * 
     * @param domain
     * @param tf
     * @return connection

        else {
            Trans2FindFirst2 req = new Trans2FindFirst2(
                tf.getConfig(),
                "\\",
                "*",
                SmbConstants.ATTR_DIRECTORY,
                tf.getConfig().getListCount(),
                tf.getConfig().getListSize());
            Trans2FindFirst2Response resp = new Trans2FindFirst2Response(tf.getConfig());
            try {
                send(req, resp);
            }

                for ( String name : names ) {
                    URL u = new URL(purl, name);
                    try ( SmbResource tf = new SmbFile(u, d.getContext()) ) {
                        assertTrue("File exists " + u, tf.exists());
                        assertEquals(name, tf.getName());
                    }
                }
            }
            finally {
                d.delete();
            }

        throw new ClassCastException();
    }


    /**
     *
     * @param tf
     * @return a session for the context
     */
    @Override
    public SmbSessionImpl getSmbSession ( CIFSContext tf ) {
        return getSmbSession(tf, null, null);
    }


    /**
     *
     * @param tf
     *            context to use
     * @return a session for the context
     */
    @Override

    SmbSessionImpl ( CIFSContext tf, String targetHost, String targetDomain, SmbTransportImpl transport ) {
        this.transportContext = tf;
        this.targetDomain = targetDomain;
        this.targetHost = targetHost;
        this.transport = transport.acquire();
        this.trees = new ArrayList<>();
        this.credentials = tf.getCredentials().unwrap(CredentialsInternal.class).clone();
    }

import jcifs.internal.Request;


/**
 * @author mbechler
 * @internal
 */
public interface SmbTreeInternal extends SmbTree {

    /**
     * @param tf
     * @throws SmbException
     */
    @Deprecated
    void connectLogon ( CIFSContext tf ) throws SmbException;


    /**
     * @param request
     * @param params
     * @return response message
     * @throws CIFSException
     */

    /**
     * @param ctx
     * @return session
     */
    SmbSession getSmbSession ( CIFSContext ctx );


    /**
     * @param tf
     * @param targetHost
     * @param targetDomain
     * @return session
     */
    SmbSession getSmbSession ( CIFSContext tf, String targetHost, String targetDomain );


    /**
     * @return whether this is a SMB2 connection
     * @throws SmbException
     */