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JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java
/* jcifs smb client library in Java
* Copyright (C) 2000 "Michael B. Allen"
*
* 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.netbios;
import java.net.InetAddress;
import jcifs.util.Hexdump;
abstract class NameServicePacket {
// opcode
static final int QUERY = 0;
static final int WACK = 7;
// rcode
static final int FMT_ERR = 0x1;
static final int SRV_ERR = 0x2;
static final int IMP_ERR = 0x4;
static final int RFS_ERR = 0x5;
static final int ACT_ERR = 0x6;
static final int CFT_ERR = 0x7;
// type/class
static final int NB_IN = 0x00200001;
static final int NBSTAT_IN = 0x00210001;
static final int NB = 0x0020;
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;
static final int ADDITIONAL_OFFSET = 10;
static void writeInt2( int val, byte[] dst, int dstIndex ) {
dst[dstIndex++] = (byte)(( val >> 8 ) & 0xFF );
dst[dstIndex] = (byte)( val & 0xFF );
}
static void writeInt4( int val, byte[] dst, int dstIndex ) {
dst[dstIndex++] = (byte)(( val >> 24 ) & 0xFF );
dst[dstIndex++] = (byte)(( val >> 16 ) & 0xFF );
dst[dstIndex++] = (byte)(( val >> 8 ) & 0xFF );
dst[dstIndex] = (byte)( val & 0xFF );
}
static int readInt2( byte[] src, int srcIndex ) {
return (( src[srcIndex] & 0xFF ) << 8 ) +
( src[srcIndex + 1] & 0xFF );
}
static int readInt4( byte[] src, int srcIndex ) {
return (( src[srcIndex] & 0xFF ) << 24 ) +
(( src[srcIndex + 1] & 0xFF ) << 16 ) +
(( src[srcIndex + 2] & 0xFF ) << 8 ) +
( src[srcIndex + 3] & 0xFF );
}
static int readNameTrnId( byte[] src, int srcIndex ) {
return readInt2( src, srcIndex );
}
int addrIndex;
NbtAddress[] addrEntry;
int nameTrnId;
int opCode,
resultCode,
questionCount,
answerCount,
authorityCount,
additionalCount;
boolean received,
isResponse,
isAuthAnswer,
isTruncated,
isRecurDesired,
isRecurAvailable,
isBroadcast;
Name questionName;
Name recordName;
int questionType,
questionClass,
recordType,
recordClass,
ttl,
rDataLength;
InetAddress addr;
NameServicePacket() {
isRecurDesired = true;
isBroadcast = true;
questionCount = 1;
questionClass = IN;
}
int writeWireFormat( byte[] dst, int dstIndex ) {
int start = dstIndex;
dstIndex += writeHeaderWireFormat( dst, dstIndex );
dstIndex += writeBodyWireFormat( dst, dstIndex );
return dstIndex - start;
}
int readWireFormat( byte[] src, int srcIndex ) {
int start = srcIndex;
srcIndex += readHeaderWireFormat( src, srcIndex );
srcIndex += readBodyWireFormat( src, srcIndex );
return srcIndex - start;
}
int writeHeaderWireFormat( byte[] dst, int dstIndex ) {
int start = dstIndex;
writeInt2( nameTrnId, dst, dstIndex );
dst[dstIndex + OPCODE_OFFSET] = (byte)(( isResponse ? 0x80 : 0x00 ) +
(( opCode << 3 ) & 0x78 ) +
( isAuthAnswer ? 0x04 : 0x00 ) +
( isTruncated ? 0x02 : 0x00 ) +
( isRecurDesired ? 0x01 : 0x00 ));
dst[dstIndex + OPCODE_OFFSET + 1] = (byte)(( isRecurAvailable ? 0x80 : 0x00 ) +
( isBroadcast ? 0x10 : 0x00 ) +
( resultCode & 0x0F ));
writeInt2( questionCount, dst, start + QUESTION_OFFSET );
writeInt2( answerCount, dst, start + ANSWER_OFFSET );
writeInt2( authorityCount, dst, start + AUTHORITY_OFFSET );
writeInt2( additionalCount, dst, start + ADDITIONAL_OFFSET );
return HEADER_LENGTH;
}
int readHeaderWireFormat( byte[] src, int srcIndex ) {
nameTrnId = readInt2( src, srcIndex );
isResponse = (( src[srcIndex + OPCODE_OFFSET] & 0x80 ) == 0 ) ? false : true;
opCode = ( src[srcIndex + OPCODE_OFFSET] & 0x78 ) >> 3;
isAuthAnswer = (( src[srcIndex + OPCODE_OFFSET] & 0x04 ) == 0 ) ? false : true;
isTruncated = (( src[srcIndex + OPCODE_OFFSET] & 0x02 ) == 0 ) ? false : true;
isRecurDesired = (( src[srcIndex + OPCODE_OFFSET] & 0x01 ) == 0 ) ? false : true;
isRecurAvailable =
(( src[srcIndex + OPCODE_OFFSET + 1] & 0x80 ) == 0 ) ? false : true;
isBroadcast = (( src[srcIndex + OPCODE_OFFSET + 1] & 0x10 ) == 0 ) ? false : true;
resultCode = src[srcIndex + OPCODE_OFFSET + 1] & 0x0F;
questionCount = readInt2( src, srcIndex + QUESTION_OFFSET );
answerCount = readInt2( src, srcIndex + ANSWER_OFFSET );
authorityCount = readInt2( src, srcIndex + AUTHORITY_OFFSET );
additionalCount = readInt2( src, srcIndex + ADDITIONAL_OFFSET );
return HEADER_LENGTH;
}
int writeQuestionSectionWireFormat( byte[] dst, int dstIndex ) {
int start = dstIndex;
dstIndex += questionName.writeWireFormat( dst, dstIndex );
writeInt2( questionType, dst, dstIndex );
dstIndex += 2;
writeInt2( questionClass, dst, dstIndex );
dstIndex += 2;
return dstIndex - start;
}
int readQuestionSectionWireFormat( byte[] src, int srcIndex ) {
int start = srcIndex;
srcIndex += questionName.readWireFormat( src, srcIndex );
questionType = readInt2( src, srcIndex );
srcIndex += 2;
questionClass = readInt2( src, srcIndex );
srcIndex += 2;
return srcIndex - start;
}
int writeResourceRecordWireFormat( byte[] dst, int dstIndex ) {
int start = dstIndex;
if( recordName == questionName ) {
dst[dstIndex++] = (byte)0xC0; // label string pointer to
dst[dstIndex++] = (byte)0x0C; // questionName (offset 12)
} else {
dstIndex += recordName.writeWireFormat( dst, dstIndex );
}
writeInt2( recordType, dst, dstIndex );
dstIndex += 2;
writeInt2( recordClass, dst, dstIndex );
dstIndex += 2;
writeInt4( ttl, dst, dstIndex );
dstIndex += 4;
rDataLength = writeRDataWireFormat( dst, dstIndex + 2 );
writeInt2( rDataLength, dst, dstIndex );
dstIndex += 2 + rDataLength;
return dstIndex - start;
}
int readResourceRecordWireFormat( byte[] src, int srcIndex ) {
int start = srcIndex;
int end;
if(( src[srcIndex] & 0xC0 ) == 0xC0 ) {
recordName = questionName; // label string pointer to questionName
srcIndex += 2;
} else {
srcIndex += recordName.readWireFormat( src, srcIndex );
}
recordType = readInt2( src, srcIndex );
srcIndex += 2;
recordClass = readInt2( src, srcIndex );
srcIndex += 2;
ttl = readInt4( src, srcIndex );
srcIndex += 4;
rDataLength = readInt2( src, srcIndex );
srcIndex += 2;
addrEntry = new NbtAddress[rDataLength / 6];
end = srcIndex + rDataLength;
/* Apparently readRDataWireFormat can return 0 if resultCode != 0 in
which case this will look indefinitely. Putting this else clause around
the loop might fix that. But I would need to see a capture to confirm.
if (resultCode != 0) {
srcIndex += rDataLength;
} else {
*/
for( addrIndex = 0; srcIndex < end; addrIndex++ ) {
srcIndex += readRDataWireFormat( src, srcIndex );
}
return srcIndex - start;
}
abstract int writeBodyWireFormat( byte[] dst, int dstIndex );
abstract int readBodyWireFormat( byte[] src, int srcIndex );
abstract int writeRDataWireFormat( byte[] dst, int dstIndex );
abstract int readRDataWireFormat( byte[] src, int srcIndex );
public String toString() {
String opCodeString,
resultCodeString,
questionTypeString,
questionClassString,
recordTypeString,
recordClassString;
switch( opCode ) {
case QUERY:
opCodeString = "QUERY";
break;
case WACK:
opCodeString = "WACK";
break;
default:
opCodeString = Integer.toString( opCode );
break;
}
switch( resultCode ) {
case FMT_ERR:
resultCodeString = "FMT_ERR";
break;
case SRV_ERR:
resultCodeString = "SRV_ERR";
break;
case IMP_ERR:
resultCodeString = "IMP_ERR";
break;
case RFS_ERR:
resultCodeString = "RFS_ERR";
break;
case ACT_ERR:
resultCodeString = "ACT_ERR";
break;
case CFT_ERR:
resultCodeString = "CFT_ERR";
break;
default:
resultCodeString = "0x" + Hexdump.toHexString( resultCode, 1 );
break;
}
switch( questionType ) {
case NB:
questionTypeString = "NB";
break;
case NBSTAT:
questionTypeString = "NBSTAT";
break;
default:
questionTypeString = "0x" + Hexdump.toHexString( questionType, 4 );
break;
}
switch( recordType ) {
case A:
recordTypeString = "A";
break;
case NS:
recordTypeString = "NS";
break;
case NULL:
recordTypeString = "NULL";
break;
case NB:
recordTypeString = "NB";
break;
case NBSTAT:
recordTypeString = "NBSTAT";
break;
default:
recordTypeString = "0x" + Hexdump.toHexString( recordType, 4 );
break;
}
return new String(
"nameTrnId=" + nameTrnId +
",isResponse=" + isResponse +
",opCode=" + opCodeString +
",isAuthAnswer=" + isAuthAnswer +
",isTruncated=" + isTruncated +
",isRecurAvailable=" + isRecurAvailable +
",isRecurDesired=" + isRecurDesired +
",isBroadcast=" + isBroadcast +
",resultCode=" + resultCode +
",questionCount=" + questionCount +
",answerCount=" + answerCount +
",authorityCount=" + authorityCount +
",additionalCount=" + additionalCount +
",questionName=" + questionName +
",questionType=" + questionTypeString +
",questionClass=" + ( questionClass == IN ? "IN" :
"0x" + Hexdump.toHexString( questionClass, 4 )) +
",recordName=" + recordName +
",recordType=" + recordTypeString +
",recordClass=" + ( recordClass == IN ? "IN" :
"0x" + Hexdump.toHexString( recordClass, 4 )) +
",ttl=" + ttl +
",rDataLength=" + rDataLength );
}
}
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