/// <exception cref="WinrtCifs.Smb.SmbException"></exception>
public virtual int Read(byte[] b, int off, int len)
{
if (len <= 0)
{
return(0);
}
long start = _fp;
// ensure file is open
if (_file.IsOpen() == false)
{
_file.Open(_openFlags, 0, SmbFile.AttrNormal, _options);
}
int r;
int n;
SmbComReadAndXResponse response = new SmbComReadAndXResponse(b, off);
do
{
r = len > _readSize ? _readSize : len;
_file.Send(new SmbComReadAndX(_file.Fid, _fp, r, null), response);
if ((n = response.DataLength) <= 0)
{
return((int)((_fp - start) > 0L ? _fp - start : -1));
}
_fp += n;
len -= n;
response.Off += n;
}while (len > 0 && n == r);
return((int)(_fp - start));
}
/// <exception cref="System.IO.IOException"></exception>
protected internal override void DoRecv(Response response)
{
ServerMessageBlock resp = (ServerMessageBlock)response;
resp.UseUnicode = UseUnicode;
resp.ExtendedSecurity = (Capabilities & SmbConstants.CapExtendedSecurity) == SmbConstants.CapExtendedSecurity;
lock (Buf)
{
Array.Copy(Sbuf, 0, Buf, 0, 4 + SmbConstants.HeaderLength);
int size = Encdec.Dec_uint16be(Buf, 2) & 0xFFFF;
if (size < (SmbConstants.HeaderLength + 1) || (4 + size) > RcvBufSize)
{
throw new IOException("Invalid payload size: " + size);
}
int errorCode = Encdec.Dec_uint32le(Buf, 9) & unchecked ((int)(0xFFFFFFFF));
if (resp.Command == ServerMessageBlock.SmbComReadAndx && (errorCode == 0 || errorCode
== unchecked ((int)(0x80000005))))
{
// overflow indicator normal for pipe
SmbComReadAndXResponse r = (SmbComReadAndXResponse)resp;
int off = SmbConstants.HeaderLength;
Readn(In, Buf, 4 + off, 27);
off += 27;
resp.Decode(Buf, 4);
int pad = r.DataOffset - off;
if (r.ByteCount > 0 && pad > 0 && pad < 4)
{
Readn(In, Buf, 4 + off, pad);
}
if (r.DataLength > 0)
{
Readn(In, r.B, r.Off, r.DataLength);
}
}
else
{
Readn(In, Buf, 4 + 32, size - 32);
resp.Decode(Buf, 4);
if (resp is SmbComTransactionResponse)
{
((SmbComTransactionResponse)resp).Current();
}
}
if (Digest != null && resp.ErrorCode == 0)
{
Digest.Verify(Buf, 4, resp);
}
if (Log.Level >= 4)
{
Log.WriteLine(response);
if (Log.Level >= 6)
{
Hexdump.ToHexdump(Log, Buf, 4, size);
}
}
}
}
/// <summary>Performs MAC signature verification.</summary>
/// <remarks>
/// Performs MAC signature verification. This calculates the signature
/// of the SMB and compares it to the signature field on the SMB itself.
/// </remarks>
/// <param name="data">The data.</param>
/// <param name="offset">The starting offset at which the SMB header begins.</param>
/// <param name="length">The length of the SMB data starting at offset.</param>
internal virtual bool Verify(byte[] data, int offset, ServerMessageBlock response
)
{
Update(_macSigningKey, 0, _macSigningKey.Length);
int index = offset;
Update(data, index, SmbConstants.SignatureOffset);
index += SmbConstants.SignatureOffset;
byte[] sequence = new byte[8];
ServerMessageBlock.WriteInt4(response.SignSeq, sequence, 0);
Update(sequence, 0, sequence.Length);
index += 8;
if (response.Command == ServerMessageBlock.SmbComReadAndx)
{
SmbComReadAndXResponse raxr = (SmbComReadAndXResponse)response;
int length = response.Length - raxr.DataLength;
Update(data, index, length - SmbConstants.SignatureOffset - 8);
Update(raxr.B, raxr.Off, raxr.DataLength);
}
else
{
Update(data, index, response.Length - SmbConstants.SignatureOffset - 8);
}
byte[] signature = Digest();
for (int i = 0; i < 8; i++)
{
if (signature[i] != data[offset + SmbConstants.SignatureOffset + i])
{
if (Log.Level >= 2)
{
Log.WriteLine("signature verification failure");
Hexdump.ToHexdump(Log, signature, 0, 8);
Hexdump.ToHexdump(Log, data, offset + SmbConstants.SignatureOffset, 8);
}
return(response.VerifyFailed = true);
}
}
return(response.VerifyFailed = false);
}
/// <exception cref="System.IO.IOException"></exception>
public virtual int ReadDirect(byte[] b, int off, int len)
{
if (len <= 0)
{
return(0);
}
long start = _fp;
if (_tmp == null)
{
throw new IOException("Bad file descriptor");
}
// ensure file is open
File.Open(_openFlags, _access, SmbFile.AttrNormal, 0);
if (File.Log.Level >= 4)
{
File.Log.WriteLine("read: fid=" + File.Fid + ",off=" + off + ",len=" + len);
}
SmbComReadAndXResponse response = new SmbComReadAndXResponse(b, off);
if (File.Type == SmbFile.TypeNamedPipe)
{
response.ResponseTimeout = 0;
}
int r;
int n;
do
{
r = len > _readSize ? _readSize : len;
if (File.Log.Level >= 4)
{
File.Log.WriteLine("read: len=" + len + ",r=" + r + ",fp=" + _fp);
}
try
{
SmbComReadAndX request = new SmbComReadAndX(File.Fid, _fp, r, null);
if (File.Type == SmbFile.TypeNamedPipe)
{
request.MinCount = request.MaxCount = request.Remaining = 1024;
}
File.Send(request, response);
}
catch (SmbException se)
{
if (File.Type == SmbFile.TypeNamedPipe && se.GetNtStatus() == NtStatus.NtStatusPipeBroken)
{
return(-1);
}
throw SeToIoe(se);
}
if ((n = response.DataLength) <= 0)
{
return((int)((_fp - start) > 0L ? _fp - start : -1));
}
_fp += n;
len -= n;
response.Off += n;
}while (len > 0 && n == r);
return((int)(_fp - start));
}
