private bool NegotiateNTLanManagerDialect()
{
if (m_transport == SMBTransportType.NetBiosOverTCP)
{
SessionRequestPacket sessionRequest = new SessionRequestPacket();
sessionRequest.CalledName = NetBiosUtils.GetMSNetBiosName("*SMBSERVER", NetBiosSuffix.FileServiceService);;
sessionRequest.CallingName = NetBiosUtils.GetMSNetBiosName(Environment.MachineName, NetBiosSuffix.WorkstationService);
TrySendPacket(m_clientSocket, sessionRequest);
}
NegotiateRequest request = new NegotiateRequest();
request.Dialects.Add(NTLanManagerDialect);
TrySendMessage(m_clientSocket, request);
SMB1Message reply = WaitForMessage(CommandName.SMB_COM_NEGOTIATE);
if (reply == null)
{
return(false);
}
if (reply.Commands[0] is NegotiateResponse)
{
NegotiateResponse response = (NegotiateResponse)reply.Commands[0];
return(true);
}
else if (reply.Commands[0] is NegotiateResponseExtended)
{
NegotiateResponseExtended response = (NegotiateResponseExtended)reply.Commands[0];
return(true);
}
else
{
return(false);
}
}
public bool Connect(IPAddress serverAddress, SMBTransportType transport, bool forceExtendedSecurity, string serverName = null)
{
m_transport = transport;
if (!m_isConnected)
{
m_forceExtendedSecurity = forceExtendedSecurity;
int port;
port = transport == SMBTransportType.NetBiosOverTCP ? NetBiosOverTCPPort : DirectTCPPort;
if (!ConnectSocket(serverAddress, port))
{
return(false);
}
if (transport == SMBTransportType.NetBiosOverTCP)
{
SessionRequestPacket sessionRequest = new SessionRequestPacket();
sessionRequest.CalledName = NetBiosUtils.GetMSNetBiosName(serverName ?? "*SMBSERVER", NetBiosSuffix.FileServiceService);
sessionRequest.CallingName = NetBiosUtils.GetMSNetBiosName(Environment.MachineName, NetBiosSuffix.WorkstationService);
TrySendPacket(m_clientSocket, sessionRequest);
SessionPacket sessionResponsePacket = WaitForSessionResponsePacket();
if (!(sessionResponsePacket is PositiveSessionResponsePacket))
{
m_clientSocket.Disconnect(false);
if (!ConnectSocket(serverAddress, port))
{
return(false);
}
NameServiceClient nameServiceClient = new NameServiceClient(serverAddress);
serverName = nameServiceClient.GetServerName();
if (serverName == null)
{
return(false);
}
sessionRequest.CalledName = serverName;
TrySendPacket(m_clientSocket, sessionRequest);
sessionResponsePacket = WaitForSessionResponsePacket();
if (!(sessionResponsePacket is PositiveSessionResponsePacket))
{
return(false);
}
}
}
bool supportsDialect = NegotiateDialect(m_forceExtendedSecurity);
if (!supportsDialect)
{
m_clientSocket.Close();
}
else
{
m_isConnected = true;
}
}
return(m_isConnected);
}
private bool NegotiateDialect(bool forceExtendedSecurity)
{
if (m_transport == SMBTransportType.NetBiosOverTCP)
{
SessionRequestPacket sessionRequest = new SessionRequestPacket();
sessionRequest.CalledName = NetBiosUtils.GetMSNetBiosName("*SMBSERVER", NetBiosSuffix.FileServiceService);;
sessionRequest.CallingName = NetBiosUtils.GetMSNetBiosName(Environment.MachineName, NetBiosSuffix.WorkstationService);
TrySendPacket(m_clientSocket, sessionRequest);
}
NegotiateRequest request = new NegotiateRequest();
request.Dialects.Add(NTLanManagerDialect);
TrySendMessage(request);
SMB1Message reply = WaitForMessage(CommandName.SMB_COM_NEGOTIATE);
if (reply == null)
{
return(false);
}
if (reply.Commands[0] is NegotiateResponse && !forceExtendedSecurity)
{
NegotiateResponse response = (NegotiateResponse)reply.Commands[0];
m_unicode = ((response.Capabilities & Capabilities.Unicode) > 0);
m_largeFiles = ((response.Capabilities & Capabilities.LargeFiles) > 0);
bool ntSMB = ((response.Capabilities & Capabilities.NTSMB) > 0);
bool rpc = ((response.Capabilities & Capabilities.RpcRemoteApi) > 0);
bool ntStatusCode = ((response.Capabilities & Capabilities.NTStatusCode) > 0);
m_infoLevelPassthrough = ((response.Capabilities & Capabilities.InfoLevelPassthrough) > 0);
m_largeRead = ((response.Capabilities & Capabilities.LargeRead) > 0);
m_largeWrite = ((response.Capabilities & Capabilities.LargeWrite) > 0);
m_serverMaxBufferSize = response.MaxBufferSize;
m_maxMpxCount = Math.Min(response.MaxMpxCount, ClientMaxMpxCount);
m_serverChallenge = response.Challenge;
return(ntSMB && rpc && ntStatusCode);
}
else if (reply.Commands[0] is NegotiateResponseExtended)
{
NegotiateResponseExtended response = (NegotiateResponseExtended)reply.Commands[0];
m_unicode = ((response.Capabilities & Capabilities.Unicode) > 0);
m_largeFiles = ((response.Capabilities & Capabilities.LargeFiles) > 0);
bool ntSMB = ((response.Capabilities & Capabilities.NTSMB) > 0);
bool rpc = ((response.Capabilities & Capabilities.RpcRemoteApi) > 0);
bool ntStatusCode = ((response.Capabilities & Capabilities.NTStatusCode) > 0);
m_infoLevelPassthrough = ((response.Capabilities & Capabilities.InfoLevelPassthrough) > 0);
m_largeRead = ((response.Capabilities & Capabilities.LargeRead) > 0);
m_largeWrite = ((response.Capabilities & Capabilities.LargeWrite) > 0);
m_serverMaxBufferSize = response.MaxBufferSize;
m_maxMpxCount = Math.Min(response.MaxMpxCount, ClientMaxMpxCount);
m_securityBlob = response.SecurityBlob;
return(ntSMB && rpc && ntStatusCode);
}
else
{
return(false);
}
}
private void ReceiveCallback(IAsyncResult result)
{
if (!m_listening)
{
return;
}
IPEndPoint remoteEP = null;
byte[] buffer;
try
{
buffer = m_client.EndReceive(result, ref remoteEP);
}
catch (ObjectDisposedException)
{
return;
}
catch (SocketException)
{
return;
}
// Process buffer
if (buffer.Length > NameServicePacketHeader.Length)
{
NameServicePacketHeader header = new NameServicePacketHeader(buffer, 0);
if (header.OpCode == NameServiceOperation.QueryRequest)
{
NameQueryRequest request = null;
try
{
request = new NameQueryRequest(buffer, 0);
}
catch
{
}
if (request != null)
{
if (request.Question.Type == NameRecordType.NB)
{
string name = NetBiosUtils.GetNameFromMSNetBiosName(request.Question.Name);
NetBiosSuffix suffix = (NetBiosSuffix)request.Question.Name[15];
bool nameMatch = String.Equals(name, Environment.MachineName, StringComparison.OrdinalIgnoreCase);
if (nameMatch && ((suffix == NetBiosSuffix.WorkstationService) || (suffix == NetBiosSuffix.FileServiceService)))
{
PositiveNameQueryResponse response = new PositiveNameQueryResponse();
response.Header.TransactionID = request.Header.TransactionID;
response.Resource.Name = request.Question.Name;
NameFlags nameFlags = new NameFlags();
response.Addresses.Add(m_serverAddress.GetAddressBytes(), nameFlags);
byte[] responseBytes = response.GetBytes();
m_client.Send(responseBytes, responseBytes.Length, remoteEP);
}
}
else // NBStat
{
NodeStatusResponse response = new NodeStatusResponse();
response.Header.TransactionID = request.Header.TransactionID;
response.Resource.Name = request.Question.Name;
NameFlags nameFlags = new NameFlags();
string name1 = NetBiosUtils.GetMSNetBiosName(Environment.MachineName, NetBiosSuffix.WorkstationService);
string name2 = NetBiosUtils.GetMSNetBiosName(Environment.MachineName, NetBiosSuffix.FileServiceService);
NameFlags nameFlags3 = new NameFlags();
nameFlags3.WorkGroup = true;
string name3 = NetBiosUtils.GetMSNetBiosName(WorkgroupName, NetBiosSuffix.WorkstationService);
response.Names.Add(name1, nameFlags);
response.Names.Add(name2, nameFlags);
response.Names.Add(name3, nameFlags3);
byte[] responseBytes = response.GetBytes();
try
{
m_client.Send(responseBytes, responseBytes.Length, remoteEP);
}
catch (ObjectDisposedException)
{
}
}
}
}
}
try
{
m_client.BeginReceive(ReceiveCallback, null);
}
catch (ObjectDisposedException)
{
}
catch (SocketException)
{
}
}
public bool Connect(IPAddress serverAddress, SMBTransportType transport)
{
// Sometimes underline socket is disconnected, but m_isConnected flag is still true.
// This cause the caller try to reuse the client and fail on all calls.
if (m_clientSocket != null && !m_clientSocket.Connected)
{
// Since reconnect doesn't work for now, return false directly make response faster
return(false);
}
m_transport = transport;
if (!m_isConnected)
{
int port;
if (transport == SMBTransportType.NetBiosOverTCP)
{
port = NetBiosOverTCPPort;
}
else
{
port = DirectTCPPort;
}
if (!ConnectSocket(serverAddress, port))
{
return(false);
}
if (transport == SMBTransportType.NetBiosOverTCP)
{
SessionRequestPacket sessionRequest = new SessionRequestPacket();
sessionRequest.CalledName = NetBiosUtils.GetMSNetBiosName("*SMBSERVER", NetBiosSuffix.FileServiceService);
sessionRequest.CallingName = NetBiosUtils.GetMSNetBiosName(Environment.MachineName, NetBiosSuffix.WorkstationService);
TrySendPacket(m_clientSocket, sessionRequest);
SessionPacket sessionResponsePacket = WaitForSessionResponsePacket();
if (!(sessionResponsePacket is PositiveSessionResponsePacket))
{
m_clientSocket.Disconnect(false);
if (!ConnectSocket(serverAddress, port))
{
return(false);
}
NameServiceClient nameServiceClient = new NameServiceClient(serverAddress);
string serverName = nameServiceClient.GetServerName();
if (serverName == null)
{
return(false);
}
sessionRequest.CalledName = serverName;
TrySendPacket(m_clientSocket, sessionRequest);
sessionResponsePacket = WaitForSessionResponsePacket();
if (!(sessionResponsePacket is PositiveSessionResponsePacket))
{
return(false);
}
}
}
bool supportsDialect = NegotiateDialect();
if (!supportsDialect)
{
m_clientSocket.Close();
}
else
{
m_isConnected = true;
}
}
return(m_isConnected);
}
private bool Connect(IPAddress serverAddress, SMBTransportType transport, bool forceExtendedSecurity)
{
m_transport = transport;
if (IsConnected)
{
return(true);
}
m_forceExtendedSecurity = forceExtendedSecurity;
int port = transport == SMBTransportType.NetBiosOverTcp ? NetBiosOverTCPPort : DirectTCPPort;
ConnectSocket(serverAddress, port);
if (transport == SMBTransportType.NetBiosOverTcp)
{
SessionRequestPacket sessionRequest = new SessionRequestPacket
{
CalledName = NetBiosUtils.GetMSNetBiosName("*SMBSERVER", NetBiosSuffix.FileServiceService),
CallingName = NetBiosUtils.GetMSNetBiosName(Environment.MachineName, NetBiosSuffix.WorkstationService)
};
SendPacket(m_clientSocket !, sessionRequest);
SessionPacket?sessionResponsePacket = WaitForSessionResponsePacket();
if (!(sessionResponsePacket is PositiveSessionResponsePacket))
{
m_clientSocket?.Shutdown(SocketShutdown.Both);
m_clientSocket?.Dispose();
m_clientSocket = null;
ConnectSocket(serverAddress, port);
NameServiceClient nameServiceClient = new NameServiceClient(serverAddress);
string? serverName = nameServiceClient.GetServerName();
if (serverName == null)
{
return(false);
}
sessionRequest.CalledName = serverName;
SendPacket(m_clientSocket, sessionRequest);
sessionResponsePacket = WaitForSessionResponsePacket();
if (!(sessionResponsePacket is PositiveSessionResponsePacket))
{
return(false);
}
}
}
bool supportsDialect = NegotiateDialect(m_forceExtendedSecurity);
if (!supportsDialect)
{
m_clientSocket?.Shutdown(SocketShutdown.Both);
m_clientSocket?.Dispose();
m_clientSocket = null;
}
else
{
m_isConnected = true;
}
return(m_isConnected);
}
public async Task <bool> ConnectAsync(IPAddress serverAddress, SMBTransportType transport, CancellationToken cancellationToken)
{
m_transport = transport;
if (!m_isConnected)
{
int port;
if (transport == SMBTransportType.NetBiosOverTCP)
{
port = NetBiosOverTCPPort;
}
else
{
port = DirectTCPPort;
}
if (!ConnectSocket(serverAddress, port))
{
return(false);
}
if (transport == SMBTransportType.NetBiosOverTCP)
{
SessionRequestPacket sessionRequest = new SessionRequestPacket();
sessionRequest.CalledName = NetBiosUtils.GetMSNetBiosName("*SMBSERVER", NetBiosSuffix.FileServiceService);
sessionRequest.CallingName = NetBiosUtils.GetMSNetBiosName(Environment.MachineName, NetBiosSuffix.WorkstationService);
await TrySendPacketAsync(m_clientSocket, sessionRequest, cancellationToken);
SessionPacket sessionResponsePacket = WaitForSessionResponsePacket();
if (!(sessionResponsePacket is PositiveSessionResponsePacket))
{
m_clientSocket.Disconnect(false);
if (!ConnectSocket(serverAddress, port))
{
return(false);
}
NameServiceClient nameServiceClient = new NameServiceClient(serverAddress);
string serverName = nameServiceClient.GetServerName();
if (serverName == null)
{
return(false);
}
sessionRequest.CalledName = serverName;
await TrySendPacketAsync(m_clientSocket, sessionRequest, cancellationToken);
sessionResponsePacket = WaitForSessionResponsePacket();
if (!(sessionResponsePacket is PositiveSessionResponsePacket))
{
return(false);
}
}
}
bool supportsDialect = await NegotiateDialectAsync(cancellationToken);
if (!supportsDialect)
{
m_clientSocket.Close();
}
else
{
m_isConnected = true;
}
}
return(m_isConnected);
}