/// <summary>
/// Sets negotiated data
/// </summary>
/// <param name = "msg">SMB message returned by negotiation</param>
private void SetNegotiatedData(SmbMessage msg)
{
// Security mode at position 2
fSecurityMode = msg.getByteParameterAt(2);
fExtendedSecurity = ((fCapabilities & CAP_EXTENDED_SECURITY) != 0);
fMaxPendingMPRequests = msg.getShortParameterAt(3);
fMaxVCs = msg.getShortParameterAt(5);
fMaxBufferSize = msg.getIntParameterAt(7);
fMaxRawSize = msg.getIntParameterAt(11);
fSessionKey = msg.getIntParameterAt(15);
fCapabilities = msg.getIntParameterAt(19);
// System time from 1601 in 100ns (ticks)
long lo_time = msg.getIntParameterAt(23) & 0xffffffff;
long hi_time = msg.getIntParameterAt(27) & 0xffffffff;
// System time from 1601 in 100ns -> convert it to base 1/1/0001
fSystemTime = DateTime.FromFileTime((hi_time << 32) + lo_time).Ticks;
fTimeZone = msg.getSignedShortParameterAt(31);
fEncryptionKeyLen = msg.getByteParameterAt(33) & 0xff;
int off = msg.getContentOffset();
byte[] msgbuf = msg.getMessageBuffer();
int content_size = msg.getContentSize();
if (!fExtendedSecurity)
{
// Encryption key
fEncryptionKey = new byte[fEncryptionKeyLen];
for (int i = 0; i < fEncryptionKeyLen; i++)
fEncryptionKey[i] = msgbuf[off + i];
}
}
/// <summary>
/// Negotiates protocol (we only support NT_LM_0_12). Calls NetBIOS
/// </summary>
/// <param name = "nbt">NetBIOS session</param>
/// <param name = "nbtname">NetBIOS name</param>
/// <param name = "msg">SMB Message</param>
/// <returns>Negotiated protocol</returns>
internal static int Negotiate(NbtSession nbt, string nbtname, SmbMessage msg)
{
if (Debug.DebugOn)
Debug.WriteLine(Debug.Info, "SMB_COM_NEGOTIATE");
nbt.DoCall(nbtname);
msg.setCommand(SmbMessage.SMB_COM_NEGOTIATE);
msg.setPID(fPID);
/**
* struct {
* UCHAR BufferFormat; // DT_DIALECT
* UCHAR DialectName[]; // Null-terminated
* } Dialects[];
*/
var buf = new StringBuilder();
for (int i = 0; i < SUPPORTED_DIALECTS.Length; i++)
{
buf.Append((char) SmbMessage.DT_DIALECT);
buf.Append(SUPPORTED_DIALECTS[i]);
buf.Append('\0');
}
msg.setContent(Encoding.UTF8.GetBytes(buf.ToString()));
if (Debug.DebugOn && Debug.DebugLevel >= Debug.Buffer)
{
Debug.WriteLine(Debug.Buffer, "Supported Dialects:");
Debug.WriteLine(Debug.Buffer, msg.getMessageBuffer(), 0, msg.getMessageSize());
}
msg.SendAndRecieve(nbt, msg);
if (Debug.DebugOn && Debug.DebugLevel >= Debug.Buffer)
{
Debug.WriteLine(Debug.Buffer, "Dialects Response:");
Debug.WriteLine(Debug.Buffer, msg.getMessageBuffer(), 0, msg.getMessageSize());
}
int protocol = msg.getParameter(0);
if (protocol == -1)
throw new CifsIoException("PE1");
if (protocol != NT_LM_0_12)
throw new CifsIoException("PE2", SUPPORTED_DIALECTS[protocol]);
if (msg.getWordCount() != 17)
throw new CifsIoException("PE2", SUPPORTED_DIALECTS[protocol]);
if (Debug.DebugOn && Debug.DebugLevel >= Debug.Info)
Debug.WriteLine(Debug.Info, "Negotiated protocol: " + SUPPORTED_DIALECTS[protocol]);
return protocol;
}
