servermessageblock.java

实现网上邻居需要的jar库；可以使用库中的接口实现文件共享的功能

/* jcifs smb client library in Java
 * Copyright (C) 2000  "Michael B. Allen" <jcifs at samba dot org>
 * 
 * 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.smb;

import jcifs.Config;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Calendar;
import java.util.Date;
import jcifs.util.Hexdump;
import jcifs.util.LogStream;
import jcifs.util.transport.*;

abstract class ServerMessageBlock extends Response implements Request, SmbConstants {

    static LogStream log = LogStream.getInstance();

    static final byte[] header = {
        (byte)0xFF, (byte)'S', (byte)'M', (byte)'B',
        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00
    };

    static void writeInt2( long val, byte[] dst, int dstIndex ) {
        dst[dstIndex] = (byte)(val);
        dst[++dstIndex] = (byte)(val >> 8);
    }
    static void writeInt4( long val, byte[] dst, int dstIndex ) {
        dst[dstIndex] = (byte)(val);
        dst[++dstIndex] = (byte)(val >>= 8);
        dst[++dstIndex] = (byte)(val >>= 8);
        dst[++dstIndex] = (byte)(val >> 8);
    }
    static int readInt2( byte[] src, int srcIndex ) {
        return ( src[srcIndex] & 0xFF ) +
                (( src[srcIndex + 1] & 0xFF ) << 8 );
    }
    static int readInt4( byte[] src, int srcIndex ) {
        return ( src[srcIndex] & 0xFF ) +
                (( src[srcIndex + 1] & 0xFF ) << 8 ) +
                (( src[srcIndex + 2] & 0xFF ) << 16 ) +
                (( src[srcIndex + 3] & 0xFF ) << 24 );
    }
    static long readInt8( byte[] src, int srcIndex ) {
        return (readInt4( src, srcIndex ) & 0xFFFFFFFFL) +
            ((long)(readInt4( src, srcIndex + 4 )) << 32);
    }
    static void writeInt8( long val, byte[] dst, int dstIndex ) {
        dst[dstIndex] = (byte)(val);
        dst[++dstIndex] = (byte)(val >>= 8);
        dst[++dstIndex] = (byte)(val >>= 8);
        dst[++dstIndex] = (byte)(val >>= 8);
        dst[++dstIndex] = (byte)(val >>= 8);
        dst[++dstIndex] = (byte)(val >>= 8);
        dst[++dstIndex] = (byte)(val >>= 8);
        dst[++dstIndex] = (byte)(val >> 8);
    }
    static long readTime( byte[] src, int srcIndex ) {
        int low = readInt4( src, srcIndex );
        int hi = readInt4( src, srcIndex + 4 );
        long t = ((long)hi << 32L ) | (low & 0xFFFFFFFFL);
        t = ( t / 10000L - MILLISECONDS_BETWEEN_1970_AND_1601 );
        return t;
    }
    static void writeTime( long t, byte[] dst, int dstIndex ) {
        if( t != 0L ) {
            t = (t + MILLISECONDS_BETWEEN_1970_AND_1601) * 10000L;
        }
        writeInt8( t, dst, dstIndex );
    }
    static long readUTime( byte[] buffer, int bufferIndex ) {
        return readInt4( buffer, bufferIndex ) * 1000L;
    }
    static void writeUTime( long t, byte[] dst, int dstIndex ) {
        if( t == 0L || t == 0xFFFFFFFFFFFFFFFFL ) {
            writeInt4( 0xFFFFFFFF, dst, dstIndex );
            return;
        }
        synchronized( TZ ) {
            if( TZ.inDaylightTime( new Date() )) {
                // in DST
                if( TZ.inDaylightTime( new Date( t ))) {
                    // t also in DST so no correction
                } else {
                    // t not in DST so subtract 1 hour
                    t -= 3600000;
                }
            } else {
                // not in DST
                if( TZ.inDaylightTime( new Date( t ))) {
                    // t is in DST so add 1 hour
                    t += 3600000;
                } else {
                    // t isn't in DST either
                }
            }
        }
        writeInt4( (int)(t / 1000L), dst, dstIndex );
    }

    /*
     * These are all the smbs supported by this library. This includes requests
     * and well as their responses for each type however the actuall implementations
     * of the readXxxWireFormat and writeXxxWireFormat methods may not be in
     * place. For example at the time of this writing the readXxxWireFormat
     * for requests and the writeXxxWireFormat for responses are not implemented
     * and simply return 0. These would need to be completed for a server
     * implementation.
     */

    static final byte SMB_COM_CREATE_DIRECTORY   = (byte)0x00;
    static final byte SMB_COM_DELETE_DIRECTORY   = (byte)0x01;
    static final byte SMB_COM_CLOSE              = (byte)0x04;
    static final byte SMB_COM_DELETE             = (byte)0x06;
    static final byte SMB_COM_RENAME             = (byte)0x07;
    static final byte SMB_COM_QUERY_INFORMATION  = (byte)0x08;
    static final byte SMB_COM_WRITE              = (byte)0x0B;
    static final byte SMB_COM_CHECK_DIRECTORY    = (byte)0x10;
    static final byte SMB_COM_TRANSACTION        = (byte)0x25;
    static final byte SMB_COM_TRANSACTION_SECONDARY = (byte)0x26;
    static final byte SMB_COM_MOVE               = (byte)0x2A;
    static final byte SMB_COM_ECHO               = (byte)0x2B;
    static final byte SMB_COM_OPEN_ANDX          = (byte)0x2D;
    static final byte SMB_COM_READ_ANDX          = (byte)0x2E;
    static final byte SMB_COM_WRITE_ANDX         = (byte)0x2F;
    static final byte SMB_COM_TRANSACTION2       = (byte)0x32;
    static final byte SMB_COM_FIND_CLOSE2        = (byte)0x34;
    static final byte SMB_COM_TREE_DISCONNECT    = (byte)0x71;
    static final byte SMB_COM_NEGOTIATE          = (byte)0x72;
    static final byte SMB_COM_SESSION_SETUP_ANDX = (byte)0x73;
    static final byte SMB_COM_LOGOFF_ANDX        = (byte)0x74;
    static final byte SMB_COM_TREE_CONNECT_ANDX  = (byte)0x75;
    static final byte SMB_COM_NT_TRANSACT        = (byte)0xA0;
    static final byte SMB_COM_NT_TRANSACT_SECONDARY = (byte)0xA1;
    static final byte SMB_COM_NT_CREATE_ANDX     = (byte)0xA2;

    /*
     * Some fields specify the offset from the beginning of the header. This
     * field should be used for calculating that. This would likely be zero
     * but an implemantation that encorporates the transport header(for
     * efficiency) might use a different initial bufferIndex. For example,
     * to eliminate copying data when writing NbtSession data one might
     * manage that 4 byte header specifically and therefore the initial
     * bufferIndex, and thus headerStart, would be 4).(NOTE: If one where
     * looking for a way to improve perfomance this is precisly what you
     * would want to do as the jcifs.netbios.SocketXxxputStream classes
     * arraycopy all data read or written into a new buffer shifted over 4!)
     */

    byte command, flags;
    int headerStart,
        length,
        batchLevel,
        errorCode,
        flags2,
        tid, pid, uid, mid,
        wordCount, byteCount;
    boolean useUnicode, received, extendedSecurity;
    long responseTimeout = 1;
    int signSeq;
    boolean verifyFailed;
    NtlmPasswordAuthentication auth = null;
    String path;
    SigningDigest digest = null;
    ServerMessageBlock response;

    ServerMessageBlock() {
        flags = (byte)( FLAGS_PATH_NAMES_CASELESS | FLAGS_PATH_NAMES_CANONICALIZED );
        pid = PID;
        batchLevel = 0;
    }

    void reset() {
        flags = (byte)( FLAGS_PATH_NAMES_CASELESS | FLAGS_PATH_NAMES_CANONICALIZED );
        flags2 = 0;
        errorCode = 0;
        received = false;
        digest = null;
    }
    int writeString( String str, byte[] dst, int dstIndex ) {
        return writeString( str, dst, dstIndex, useUnicode );
    }
    int writeString( String str, byte[] dst, int dstIndex, boolean useUnicode ) {
        int start = dstIndex;

        try {
            if( useUnicode ) {
                // Unicode requires word alignment
                if((( dstIndex - headerStart ) % 2 ) != 0 ) {
                    dst[dstIndex++] = (byte)'\0';
                }
                System.arraycopy( str.getBytes( "UnicodeLittleUnmarked" ), 0,
                                    dst, dstIndex, str.length() * 2 );
                dstIndex += str.length() * 2;
                dst[dstIndex++] = (byte)'\0';
                dst[dstIndex++] = (byte)'\0';
            } else {
                byte[] b = str.getBytes( OEM_ENCODING );
                System.arraycopy( b, 0, dst, dstIndex, b.length );
                dstIndex += b.length;
                dst[dstIndex++] = (byte)'\0';
            }
        } catch( UnsupportedEncodingException uee ) {
            if( log.level > 1 )
                uee.printStackTrace( log );
        }

        return dstIndex - start;
    }
    String readString( byte[] src, int srcIndex ) {
        return readString( src, srcIndex, 256, useUnicode );
    }
    String readString( byte[] src, int srcIndex, int maxLen, boolean useUnicode ) {
        int len = 0;
        String str = null;
        try {
            if( useUnicode ) {
                // Unicode requires word alignment
                if((( srcIndex - headerStart ) % 2 ) != 0 ) {
                    srcIndex++;
                }
                while( src[srcIndex + len] != (byte)0x00 ||
                                            src[srcIndex + len + 1] != (byte)0x00 ) {
                    len += 2;
                    if( len > maxLen ) {
if( log.level > 0 )
Hexdump.hexdump( System.err, src, srcIndex, maxLen < 128 ? maxLen + 8 : 128 );
                        throw new RuntimeException( "zero termination not found" );
                    }
                }
                str = new String( src, srcIndex, len, "UnicodeLittleUnmarked" );
            } else {
                while( src[srcIndex + len] != (byte)0x00 ) {
                    len++;
                    if( len > maxLen ) {
if( log.level > 0 )
Hexdump.hexdump( System.err, src, srcIndex, maxLen < 128 ? maxLen + 8 : 128 );
                        throw new RuntimeException( "zero termination not found" );
                    }
                }
                str = new String( src, srcIndex, len, OEM_ENCODING );
            }
        } catch( UnsupportedEncodingException uee ) {
            if( log.level > 1 )
                uee.printStackTrace( log );
        }
        return str;
    }