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JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java
There is a newer version: 1.3.18.1
/* jcifs msrpc client library in Java
 * Copyright (C) 2006  "Michael B. Allen" 
 *                     "Eric Glass" 
 * 
 * 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 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.dcerpc;

import java.net.*;
import java.io.*;

import jcifs.dcerpc.ndr.NdrBuffer;
import jcifs.smb.*;
import jcifs.util.*;

public class DcerpcPipeHandle extends DcerpcHandle {

    SmbNamedPipe pipe;
    SmbFileInputStream in = null;
    SmbFileOutputStream out = null;
    boolean isStart = true;

    public DcerpcPipeHandle(String url,
                NtlmPasswordAuthentication auth)
                throws UnknownHostException, MalformedURLException, DcerpcException {
        binding = DcerpcHandle.parseBinding(url);
        url = "smb://" + binding.server + "/IPC$/" + binding.endpoint.substring(6);

        String params = "", server, address;
        server = (String)binding.getOption("server");
        if (server != null)
            params += "&server=" + server;
        address = (String)binding.getOption("address");
        if (server != null)
            params += "&address=" + address;
        if (params.length() > 0)
            url += "?" + params.substring(1);

        pipe = new SmbNamedPipe(url,
                /* This 0x20000 bit is going to get chopped! */
                (0x2019F << 16) | SmbNamedPipe.PIPE_TYPE_RDWR | SmbNamedPipe.PIPE_TYPE_DCE_TRANSACT,
                auth);
    }

    protected void doSendFragment(byte[] buf,
                    int off,
                    int length,
                    boolean isDirect) throws IOException {
        if (out != null && out.isOpen() == false)
            throw new IOException("DCERPC pipe is no longer open");

        if (in == null)
            in = (SmbFileInputStream)pipe.getNamedPipeInputStream();
        if (out == null)
            out = (SmbFileOutputStream)pipe.getNamedPipeOutputStream();
        if (isDirect) {
            out.writeDirect( buf, off, length, 1 );
            return;
        }
        out.write(buf, off, length);
    }
    protected void doReceiveFragment(byte[] buf, boolean isDirect) throws IOException {
        int off, flags, length;

        if (buf.length < max_recv)
            throw new IllegalArgumentException("buffer too small");

        if (isStart && !isDirect) { // start of new frag, do trans
            off = in.read(buf, 0, 1024);
        } else {
            off = in.readDirect(buf, 0, buf.length);
        }

        if (buf[0] != 5 && buf[1] != 0)
            throw new IOException("Unexpected DCERPC PDU header");

        flags = buf[3] & 0xFF;
        // next read is start of new frag
        isStart = (flags & DCERPC_LAST_FRAG) == DCERPC_LAST_FRAG;

        length = Encdec.dec_uint16le(buf, 8);
        if (length > max_recv)
            throw new IOException("Unexpected fragment length: " + length);

        while (off < length) {
            off += in.readDirect(buf, off, length - off);
        }
    }
    public void close() throws IOException {
        state = 0;
        if (out != null)
            out.close();
    }
}