449 lines
11 KiB
C#
449 lines
11 KiB
C#
// This code is derived from jcifs smb client library <jcifs at samba dot org>
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// Ported by J. Arturo <webmaster at komodosoft dot net>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System.Net;
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using SharpCifs.Util;
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using SharpCifs.Util.Sharpen;
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namespace SharpCifs.Netbios
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{
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internal abstract class NameServicePacket
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{
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internal const int Query = 0;
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internal const int Wack = 7;
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internal const int FmtErr = 0x1;
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internal const int SrvErr = 0x2;
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internal const int ImpErr = 0x4;
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internal const int RfsErr = 0x5;
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internal const int ActErr = 0x6;
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internal const int CftErr = 0x7;
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internal const int NbIn = 0x00200001;
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internal const int NbstatIn = 0x00210001;
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internal const int Nb = 0x0020;
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internal const int Nbstat = 0x0021;
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internal const int In = 0x0001;
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internal const int A = 0x0001;
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internal const int Ns = 0x0002;
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internal const int Null = 0x000a;
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internal const int HeaderLength = 12;
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internal const int OpcodeOffset = 2;
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internal const int QuestionOffset = 4;
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internal const int AnswerOffset = 6;
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internal const int AuthorityOffset = 8;
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internal const int AdditionalOffset = 10;
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// opcode
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// rcode
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// type/class
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// header field offsets
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internal static void WriteInt2(int val, byte[] dst, int dstIndex)
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{
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dst[dstIndex++] = unchecked((byte)((val >> 8) & unchecked(0xFF)));
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dst[dstIndex] = unchecked((byte)(val & unchecked(0xFF)));
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}
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internal static void WriteInt4(int val, byte[] dst, int dstIndex)
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{
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dst[dstIndex++] = unchecked((byte)((val >> 24) & unchecked(0xFF)));
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dst[dstIndex++] = unchecked((byte)((val >> 16) & unchecked(0xFF)));
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dst[dstIndex++] = unchecked((byte)((val >> 8) & unchecked(0xFF)));
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dst[dstIndex] = unchecked((byte)(val & unchecked(0xFF)));
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}
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internal static int ReadInt2(byte[] src, int srcIndex)
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{
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return ((src[srcIndex] & unchecked(0xFF)) << 8) + (src[srcIndex + 1] & unchecked(
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0xFF));
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}
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internal static int ReadInt4(byte[] src, int srcIndex)
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{
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return ((src[srcIndex] & unchecked(0xFF)) << 24) + ((src[srcIndex + 1] & unchecked(
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0xFF)) << 16) + ((src[srcIndex + 2] & unchecked(0xFF)) << 8) + (src
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[srcIndex + 3] & unchecked(0xFF));
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}
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internal static int ReadNameTrnId(byte[] src, int srcIndex)
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{
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return ReadInt2(src, srcIndex);
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}
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internal int AddrIndex;
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internal NbtAddress[] AddrEntry;
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internal int NameTrnId;
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internal int OpCode;
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internal int ResultCode;
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internal int QuestionCount;
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internal int AnswerCount;
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internal int AuthorityCount;
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internal int AdditionalCount;
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internal bool Received;
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internal bool IsResponse;
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internal bool IsAuthAnswer;
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internal bool IsTruncated;
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internal bool IsRecurDesired;
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internal bool IsRecurAvailable;
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internal bool IsBroadcast;
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internal Name QuestionName;
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internal Name RecordName;
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internal int QuestionType;
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internal int QuestionClass;
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internal int RecordType;
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internal int RecordClass;
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internal int Ttl;
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internal int RDataLength;
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internal IPAddress Addr;
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public NameServicePacket()
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{
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IsRecurDesired = true;
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IsBroadcast = true;
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QuestionCount = 1;
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QuestionClass = In;
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}
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internal virtual int WriteWireFormat(byte[] dst, int dstIndex)
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{
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int start = dstIndex;
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dstIndex += WriteHeaderWireFormat(dst, dstIndex);
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dstIndex += WriteBodyWireFormat(dst, dstIndex);
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return dstIndex - start;
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}
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internal virtual int ReadWireFormat(byte[] src, int srcIndex)
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{
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int start = srcIndex;
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srcIndex += ReadHeaderWireFormat(src, srcIndex);
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srcIndex += ReadBodyWireFormat(src, srcIndex);
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return srcIndex - start;
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}
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internal virtual int WriteHeaderWireFormat(byte[] dst, int dstIndex)
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{
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int start = dstIndex;
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WriteInt2(NameTrnId, dst, dstIndex);
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dst[dstIndex + OpcodeOffset] = unchecked((byte)((IsResponse ? unchecked(0x80) : unchecked(0x00)) + ((OpCode << 3) & unchecked(0x78)) + (IsAuthAnswer
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? unchecked(0x04) : unchecked(0x00)) + (IsTruncated ? unchecked(0x02) : unchecked(0x00)) + (IsRecurDesired ? unchecked(0x01)
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: unchecked(0x00))));
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dst[dstIndex + OpcodeOffset + 1] = unchecked((byte)((IsRecurAvailable ? unchecked(
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0x80) : unchecked(0x00)) + (IsBroadcast ? unchecked(0x10) :
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unchecked(0x00)) + (ResultCode & unchecked(0x0F))));
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WriteInt2(QuestionCount, dst, start + QuestionOffset);
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WriteInt2(AnswerCount, dst, start + AnswerOffset);
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WriteInt2(AuthorityCount, dst, start + AuthorityOffset);
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WriteInt2(AdditionalCount, dst, start + AdditionalOffset);
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return HeaderLength;
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}
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internal virtual int ReadHeaderWireFormat(byte[] src, int srcIndex)
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{
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NameTrnId = ReadInt2(src, srcIndex);
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IsResponse = ((src[srcIndex + OpcodeOffset] & unchecked(0x80)) == 0) ? false
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: true;
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OpCode = (src[srcIndex + OpcodeOffset] & unchecked(0x78)) >> 3;
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IsAuthAnswer = ((src[srcIndex + OpcodeOffset] & unchecked(0x04)) == 0) ?
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false : true;
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IsTruncated = ((src[srcIndex + OpcodeOffset] & unchecked(0x02)) == 0) ? false
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: true;
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IsRecurDesired = ((src[srcIndex + OpcodeOffset] & unchecked(0x01)) == 0) ?
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false : true;
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IsRecurAvailable = ((src[srcIndex + OpcodeOffset + 1] & unchecked(0x80))
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== 0) ? false : true;
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IsBroadcast = ((src[srcIndex + OpcodeOffset + 1] & unchecked(0x10)) == 0)
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? false : true;
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ResultCode = src[srcIndex + OpcodeOffset + 1] & unchecked(0x0F);
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QuestionCount = ReadInt2(src, srcIndex + QuestionOffset);
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AnswerCount = ReadInt2(src, srcIndex + AnswerOffset);
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AuthorityCount = ReadInt2(src, srcIndex + AuthorityOffset);
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AdditionalCount = ReadInt2(src, srcIndex + AdditionalOffset);
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return HeaderLength;
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}
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internal virtual int WriteQuestionSectionWireFormat(byte[] dst, int dstIndex)
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{
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int start = dstIndex;
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dstIndex += QuestionName.WriteWireFormat(dst, dstIndex);
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WriteInt2(QuestionType, dst, dstIndex);
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dstIndex += 2;
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WriteInt2(QuestionClass, dst, dstIndex);
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dstIndex += 2;
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return dstIndex - start;
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}
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internal virtual int ReadQuestionSectionWireFormat(byte[] src, int srcIndex)
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{
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int start = srcIndex;
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srcIndex += QuestionName.ReadWireFormat(src, srcIndex);
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QuestionType = ReadInt2(src, srcIndex);
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srcIndex += 2;
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QuestionClass = ReadInt2(src, srcIndex);
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srcIndex += 2;
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return srcIndex - start;
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}
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internal virtual int WriteResourceRecordWireFormat(byte[] dst, int dstIndex)
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{
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int start = dstIndex;
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if (RecordName == QuestionName)
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{
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dst[dstIndex++] = unchecked(unchecked(0xC0));
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// label string pointer to
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dst[dstIndex++] = unchecked(unchecked(0x0C));
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}
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else
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{
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// questionName (offset 12)
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dstIndex += RecordName.WriteWireFormat(dst, dstIndex);
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}
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WriteInt2(RecordType, dst, dstIndex);
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dstIndex += 2;
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WriteInt2(RecordClass, dst, dstIndex);
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dstIndex += 2;
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WriteInt4(Ttl, dst, dstIndex);
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dstIndex += 4;
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RDataLength = WriteRDataWireFormat(dst, dstIndex + 2);
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WriteInt2(RDataLength, dst, dstIndex);
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dstIndex += 2 + RDataLength;
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return dstIndex - start;
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}
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internal virtual int ReadResourceRecordWireFormat(byte[] src, int srcIndex)
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{
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int start = srcIndex;
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int end;
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if ((src[srcIndex] & unchecked(0xC0)) == unchecked(0xC0))
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{
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RecordName = QuestionName;
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// label string pointer to questionName
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srcIndex += 2;
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}
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else
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{
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srcIndex += RecordName.ReadWireFormat(src, srcIndex);
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}
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RecordType = ReadInt2(src, srcIndex);
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srcIndex += 2;
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RecordClass = ReadInt2(src, srcIndex);
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srcIndex += 2;
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Ttl = ReadInt4(src, srcIndex);
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srcIndex += 4;
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RDataLength = ReadInt2(src, srcIndex);
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srcIndex += 2;
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AddrEntry = new NbtAddress[RDataLength / 6];
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end = srcIndex + RDataLength;
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for (AddrIndex = 0; srcIndex < end; AddrIndex++)
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{
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srcIndex += ReadRDataWireFormat(src, srcIndex);
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}
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return srcIndex - start;
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}
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internal abstract int WriteBodyWireFormat(byte[] dst, int dstIndex);
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internal abstract int ReadBodyWireFormat(byte[] src, int srcIndex);
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internal abstract int WriteRDataWireFormat(byte[] dst, int dstIndex);
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internal abstract int ReadRDataWireFormat(byte[] src, int srcIndex);
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public override string ToString()
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{
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string opCodeString;
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string resultCodeString;
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string questionTypeString;
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string recordTypeString;
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switch (OpCode)
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{
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case Query:
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{
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opCodeString = "QUERY";
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break;
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}
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case Wack:
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{
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opCodeString = "WACK";
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break;
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}
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default:
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{
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opCodeString = Extensions.ToString(OpCode);
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break;
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}
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}
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switch (ResultCode)
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{
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case FmtErr:
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{
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resultCodeString = "FMT_ERR";
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break;
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}
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case SrvErr:
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{
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resultCodeString = "SRV_ERR";
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break;
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}
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case ImpErr:
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{
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resultCodeString = "IMP_ERR";
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break;
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}
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case RfsErr:
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{
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resultCodeString = "RFS_ERR";
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break;
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}
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case ActErr:
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{
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resultCodeString = "ACT_ERR";
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break;
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}
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case CftErr:
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{
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resultCodeString = "CFT_ERR";
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break;
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}
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default:
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{
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resultCodeString = "0x" + Hexdump.ToHexString(ResultCode, 1);
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break;
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}
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}
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switch (QuestionType)
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{
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case Nb:
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{
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questionTypeString = "NB";
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break;
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}
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case Nbstat:
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{
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questionTypeString = "NBSTAT";
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break;
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}
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default:
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{
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questionTypeString = "0x" + Hexdump.ToHexString(QuestionType, 4);
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break;
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}
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}
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switch (RecordType)
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{
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case A:
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{
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recordTypeString = "A";
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break;
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}
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case Ns:
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{
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recordTypeString = "NS";
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break;
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}
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case Null:
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{
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recordTypeString = "NULL";
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break;
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}
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case Nb:
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{
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recordTypeString = "NB";
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break;
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}
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case Nbstat:
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{
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recordTypeString = "NBSTAT";
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break;
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}
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default:
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{
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recordTypeString = "0x" + Hexdump.ToHexString(RecordType, 4);
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break;
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}
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}
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return "nameTrnId=" + NameTrnId + ",isResponse=" + IsResponse + ",opCode="
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+ opCodeString + ",isAuthAnswer=" + IsAuthAnswer + ",isTruncated=" + IsTruncated
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+ ",isRecurAvailable=" + IsRecurAvailable + ",isRecurDesired=" + IsRecurDesired
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+ ",isBroadcast=" + IsBroadcast + ",resultCode=" + ResultCode + ",questionCount="
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+ QuestionCount + ",answerCount=" + AnswerCount + ",authorityCount=" + AuthorityCount
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+ ",additionalCount=" + AdditionalCount + ",questionName=" + QuestionName + ",questionType="
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+ questionTypeString + ",questionClass=" + (QuestionClass == In ? "IN" : "0x" +
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Hexdump.ToHexString(QuestionClass, 4)) + ",recordName=" + RecordName + ",recordType="
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+ recordTypeString + ",recordClass=" + (RecordClass == In ? "IN" : "0x" + Hexdump
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.ToHexString(RecordClass, 4)) + ",ttl=" + Ttl + ",rDataLength=" + RDataLength;
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}
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}
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}
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