private Smb2Packet DecodeSingleResponsePacket(
byte[] messageBytes,
bool ignoreCompoundFlag,
ulong realSessionId,
uint realTreeId,
out int consumedLength,
out int expectedLength
)
{
Packet_Header smb2Header;
bool isLeaseBreakPacket = false;
int offset = 0;
smb2Header = TypeMarshal.ToStruct<Packet_Header>(messageBytes, ref offset);
if (smb2Header.Command == Smb2Command.OPLOCK_BREAK)
{
ushort structureSize = TypeMarshal.ToStruct<ushort>(messageBytes, ref offset);
if (structureSize == (ushort)OplockLeaseBreakStructureSize.LeaseBreakNotification
|| structureSize == (ushort)OplockLeaseBreakStructureSize.LeaseBreakResponse
|| structureSize == 9) // Add this condition temporally to handle LeaseBreakResponse is error response (i.e. structureSize == 9), but this will still hide the condition when OplockBreakResponse is error response
{
isLeaseBreakPacket = true;
}
}
Smb2SinglePacket packet = null;
ushort structSize = BitConverter.ToUInt16(messageBytes, Smb2Consts.Smb2HeaderLen);
switch (smb2Header.Command)
{
case Smb2Command.CANCEL:
packet = new Smb2CancelResponsePacket();
break;
case Smb2Command.CHANGE_NOTIFY:
packet = new Smb2ChangeNotifyResponsePacket();
break;
case Smb2Command.CLOSE:
packet = new Smb2CloseResponsePacket();
break;
case Smb2Command.CREATE:
packet = new Smb2CreateResponsePacket();
break;
case Smb2Command.ECHO:
packet = new Smb2EchoResponsePacket();
break;
case Smb2Command.FLUSH:
packet = new Smb2FlushResponsePacket();
break;
case Smb2Command.IOCTL:
packet = new Smb2IOCtlResponsePacket();
break;
case Smb2Command.LOCK:
packet = new Smb2LockResponsePacket();
break;
case Smb2Command.LOGOFF:
packet = new Smb2LogOffResponsePacket();
break;
case Smb2Command.NEGOTIATE:
packet = new Smb2NegotiateResponsePacket();
break;
case Smb2Command.OPLOCK_BREAK:
if (smb2Header.MessageId == ulong.MaxValue)
{
if (!isLeaseBreakPacket)
{
packet = new Smb2OpLockBreakNotificationPacket();
}
else
{
packet = new Smb2LeaseBreakNotificationPacket();
}
}
else
{
if (!isLeaseBreakPacket)
{
packet = new Smb2OpLockBreakResponsePacket();
}
else
{
packet = new Smb2LeaseBreakResponsePacket();
}
}
break;
case Smb2Command.QUERY_DIRECTORY:
packet = new Smb2QueryDirectoryResponePacket();
break;
case Smb2Command.QUERY_INFO:
packet = new Smb2QueryInfoResponsePacket();
break;
case Smb2Command.READ:
packet = new Smb2ReadResponsePacket();
break;
case Smb2Command.SESSION_SETUP:
packet = new Smb2SessionSetupResponsePacket();
break;
case Smb2Command.SET_INFO:
packet = new Smb2SetInfoResponsePacket();
break;
case Smb2Command.TREE_CONNECT:
packet = new Smb2TreeConnectResponsePacket();
break;
case Smb2Command.TREE_DISCONNECT:
packet = new Smb2TreeDisconnectResponsePacket();
break;
case Smb2Command.WRITE:
packet = new Smb2WriteResponsePacket();
break;
default:
throw new InvalidOperationException("Received an unknown packet! the type of the packet is "
+ smb2Header.Command.ToString());
}
if (IsErrorPacket(smb2Header))
{
var error = new Smb2ErrorResponsePacket();
error.FromBytes(messageBytes, out consumedLength, out expectedLength);
packet.Header = error.Header;
packet.Error = error;
}
else
{
packet.FromBytes(messageBytes, out consumedLength, out expectedLength);
}
//if ignoreCompoundFlag is false, means the process of decoding this packet
//is not part of the process of decoding a compound packet. We will update
//context here.
if (!ignoreCompoundFlag)
{
// TODO
}
return packet;
}
public Smb2LeaseBreakNotificationPacket CreateLeaseBreakNotificationResponse(
Smb2Endpoint endpoint,
LEASE_BREAK_Notification_Packet_Flags_Values flags,
byte[] leaseKey,
LeaseStateValues currentLeaseState,
LeaseStateValues newLeaseState
)
{
Smb2LeaseBreakNotificationPacket packet = new Smb2LeaseBreakNotificationPacket();
packet.Header.Flags = Packet_Header_Flags_Values.FLAGS_SERVER_TO_REDIR;
packet.Header.Command = Smb2Command.OPLOCK_BREAK;
packet.Header.MessageId = ulong.MaxValue;
packet.Header.ProtocolId = Smb2Consts.Smb2ProtocolId;
packet.Header.Signature = new byte[Smb2Consts.SignatureSize];
packet.Header.StructureSize = Packet_Header_StructureSize_Values.V1;
packet.Endpoint = endpoint;
packet.PayLoad.AccessMaskHint = LEASE_BREAK_Notification_Packet_AccessMaskHint_Values.V1;
packet.PayLoad.BreakReason = LEASE_BREAK_Notification_Packet_BreakReason_Values.V1;
packet.PayLoad.CurrentLeaseState = currentLeaseState;
packet.PayLoad.Flags = LEASE_BREAK_Notification_Packet_Flags_Values.SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
packet.PayLoad.LeaseKey = leaseKey;
packet.PayLoad.NewLeaseState = newLeaseState;
packet.PayLoad.Reserved = LEASE_BREAK_Notification_Packet_Reserved_Values.V1;
packet.PayLoad.ShareMaskHint = LEASE_BREAK_Notification_Packet_ShareMaskHint_Values.V1;
packet.PayLoad.StructureSize = LEASE_BREAK_Notification_Packet_StructureSize_Values.V1;
packet.Sign();
return packet;
}