public byte[] GetBytes(byte[] data, int offset, int count, bool isFinalData)
{
_basicHeader = new BasicHeaderSegment();
_basicHeader.Immediate = true;
_basicHeader.OpCode = OpCode.LoginRequest;
_basicHeader.FinalPdu = isFinalData;
_basicHeader.TotalAhsLength = 0;
_basicHeader.DataSegmentLength = count;
_basicHeader.InitiatorTaskTag = _connection.Session.CurrentTaskTag;
_transit = isFinalData;
_continue = !isFinalData;
_currentStage = _connection.CurrentLoginStage;
if (_transit)
{
_nextStage = _connection.NextLoginStage;
}
_connectionId = _connection.Id;
_commandSequenceNumber = _connection.Session.CommandSequenceNumber;
_expectedStatusSequenceNumber = _connection.ExpectedStatusSequenceNumber;
byte[] buffer = new byte[Utilities.RoundUp(48 + count, 4)];
_basicHeader.WriteTo(buffer, 0);
buffer[1] = PackState();
buffer[2] = 0; // Max Version
buffer[3] = 0; // Min Version
Utilities.WriteBytesBigEndian(_connection.Session.InitiatorSessionId, buffer, 8);
Utilities.WriteBytesBigEndian(IsidQualifier, buffer, 12);
Utilities.WriteBytesBigEndian(_connection.Session.TargetSessionId, buffer, 14);
Utilities.WriteBytesBigEndian(_connectionId, buffer, 20);
Utilities.WriteBytesBigEndian(_commandSequenceNumber, buffer, 24);
Utilities.WriteBytesBigEndian(_expectedStatusSequenceNumber, buffer, 28);
Array.Copy(data, offset, buffer, 48, count);
return buffer;
}
private void UnpackState(byte value)
{
Transit = (value & 0x80) != 0;
Continue = (value & 0x40) != 0;
CurrentStage = (LoginStages)((value >> 2) & 0x3);
NextStage = (LoginStages)(value & 0x3);
}
private void UnpackState(byte value)
{
Transit = (value & 0x80) != 0;
Continue = (value & 0x40) != 0;
CurrentStage = (LoginStages)((value >> 2) & 0x3);
NextStage = (LoginStages)(value & 0x3);
}
public byte[] GetBytes(byte[] data, int offset, int count, bool isFinalData)
{
_basicHeader = new BasicHeaderSegment();
_basicHeader.Immediate = true;
_basicHeader.OpCode = OpCode.LoginRequest;
_basicHeader.FinalPdu = isFinalData;
_basicHeader.TotalAhsLength = 0;
_basicHeader.DataSegmentLength = count;
_basicHeader.InitiatorTaskTag = _connection.Session.CurrentTaskTag;
_transit = isFinalData;
_continue = !isFinalData;
_currentStage = _connection.CurrentLoginStage;
if (_transit)
{
_nextStage = _connection.NextLoginStage;
}
_connectionId = _connection.Id;
_commandSequenceNumber = _connection.Session.CommandSequenceNumber;
_expectedStatusSequenceNumber = _connection.ExpectedStatusSequenceNumber;
byte[] buffer = new byte[Utilities.RoundUp(48 + count, 4)];
_basicHeader.WriteTo(buffer, 0);
buffer[1] = PackState();
buffer[2] = 0; // Max Version
buffer[3] = 0; // Min Version
Utilities.WriteBytesBigEndian(_connection.Session.InitiatorSessionId, buffer, 8);
Utilities.WriteBytesBigEndian(IsidQualifier, buffer, 12);
Utilities.WriteBytesBigEndian(_connection.Session.TargetSessionId, buffer, 14);
Utilities.WriteBytesBigEndian(_connectionId, buffer, 20);
Utilities.WriteBytesBigEndian(_commandSequenceNumber, buffer, 24);
Utilities.WriteBytesBigEndian(_expectedStatusSequenceNumber, buffer, 28);
Array.Copy(data, offset, buffer, 48, count);
return(buffer);
}
private void NegotiateFeatures()
{
//
// Send the request...
//
TextBuffer parameters = new TextBuffer();
GetParametersToNegotiate(parameters, KeyUsagePhase.OperationalNegotiation, _session.SessionType);
_session.GetParametersToNegotiate(parameters, KeyUsagePhase.OperationalNegotiation);
byte[] paramBuffer = new byte[parameters.Size];
parameters.WriteTo(paramBuffer, 0);
LoginRequest req = new LoginRequest(this);
byte[] packet = req.GetBytes(paramBuffer, 0, paramBuffer.Length, true);
_stream.Write(packet, 0, packet.Length);
_stream.Flush();
//
// Read the response...
//
TextBuffer settings = new TextBuffer();
ProtocolDataUnit pdu = ReadPdu();
LoginResponse resp = ParseResponse <LoginResponse>(pdu);
if (resp.StatusCode != LoginStatusCode.Success)
{
throw new LoginException("iSCSI Target indicated login failure: " + resp.StatusCode);
}
if (resp.Continue)
{
MemoryStream ms = new MemoryStream();
ms.Write(resp.TextData, 0, resp.TextData.Length);
while (resp.Continue)
{
pdu = ReadPdu();
resp = ParseResponse <LoginResponse>(pdu);
ms.Write(resp.TextData, 0, resp.TextData.Length);
}
settings.ReadFrom(ms.GetBuffer(), 0, (int)ms.Length);
}
else if (resp.TextData != null)
{
settings.ReadFrom(resp.TextData, 0, resp.TextData.Length);
}
parameters = new TextBuffer();
ConsumeParameters(settings, parameters);
while (!resp.Transit || parameters.Count != 0)
{
paramBuffer = new byte[parameters.Size];
parameters.WriteTo(paramBuffer, 0);
req = new LoginRequest(this);
packet = req.GetBytes(paramBuffer, 0, paramBuffer.Length, true);
_stream.Write(packet, 0, packet.Length);
_stream.Flush();
//
// Read the response...
//
settings = new TextBuffer();
pdu = ReadPdu();
resp = ParseResponse <LoginResponse>(pdu);
if (resp.StatusCode != LoginStatusCode.Success)
{
throw new LoginException("iSCSI Target indicated login failure: " + resp.StatusCode);
}
parameters = new TextBuffer();
if (resp.TextData != null)
{
if (resp.Continue)
{
MemoryStream ms = new MemoryStream();
ms.Write(resp.TextData, 0, resp.TextData.Length);
while (resp.Continue)
{
pdu = ReadPdu();
resp = ParseResponse <LoginResponse>(pdu);
ms.Write(resp.TextData, 0, resp.TextData.Length);
}
settings.ReadFrom(ms.GetBuffer(), 0, (int)ms.Length);
}
else
{
settings.ReadFrom(resp.TextData, 0, resp.TextData.Length);
}
ConsumeParameters(settings, parameters);
}
}
if (resp.NextStage != NextLoginStage)
{
throw new LoginException("iSCSI Target wants to transition to a different login stage: " + resp.NextStage + " (expected: " + NextLoginStage + ")");
}
_loginStage = resp.NextStage;
}
private void NegotiateSecurity()
{
_loginStage = LoginStages.SecurityNegotiation;
//
// Establish the contents of the request
//
TextBuffer parameters = new TextBuffer();
GetParametersToNegotiate(parameters, KeyUsagePhase.SecurityNegotiation, _session.SessionType);
_session.GetParametersToNegotiate(parameters, KeyUsagePhase.SecurityNegotiation);
string authParam = _authenticators[0].Identifier;
for (int i = 1; i < _authenticators.Length; ++i)
{
authParam += "," + _authenticators[i].Identifier;
}
parameters.Add(AuthMethodParameter, authParam);
//
// Send the request...
//
byte[] paramBuffer = new byte[parameters.Size];
parameters.WriteTo(paramBuffer, 0);
LoginRequest req = new LoginRequest(this);
byte[] packet = req.GetBytes(paramBuffer, 0, paramBuffer.Length, true);
_stream.Write(packet, 0, packet.Length);
_stream.Flush();
//
// Read the response...
//
TextBuffer settings = new TextBuffer();
ProtocolDataUnit pdu = ReadPdu();
LoginResponse resp = ParseResponse <LoginResponse>(pdu);
if (resp.StatusCode != LoginStatusCode.Success)
{
throw new LoginException("iSCSI Target indicated login failure: " + resp.StatusCode);
}
if (resp.Continue)
{
MemoryStream ms = new MemoryStream();
ms.Write(resp.TextData, 0, resp.TextData.Length);
while (resp.Continue)
{
pdu = ReadPdu();
resp = ParseResponse <LoginResponse>(pdu);
ms.Write(resp.TextData, 0, resp.TextData.Length);
}
settings.ReadFrom(ms.GetBuffer(), 0, (int)ms.Length);
}
else if (resp.TextData != null)
{
settings.ReadFrom(resp.TextData, 0, resp.TextData.Length);
}
Authenticator authenticator = null;
for (int i = 0; i < _authenticators.Length; ++i)
{
if (settings[AuthMethodParameter] == _authenticators[i].Identifier)
{
authenticator = _authenticators[i];
break;
}
}
settings.Remove(AuthMethodParameter);
settings.Remove("TargetPortalGroupTag");
if (authenticator == null)
{
throw new LoginException("iSCSI Target specified an unsupported authentication method: " + settings[AuthMethodParameter]);
}
parameters = new TextBuffer();
ConsumeParameters(settings, parameters);
while (!resp.Transit)
{
//
// Send the request...
//
parameters = new TextBuffer();
authenticator.GetParameters(parameters);
paramBuffer = new byte[parameters.Size];
parameters.WriteTo(paramBuffer, 0);
req = new LoginRequest(this);
packet = req.GetBytes(paramBuffer, 0, paramBuffer.Length, true);
_stream.Write(packet, 0, packet.Length);
_stream.Flush();
//
// Read the response...
//
settings = new TextBuffer();
pdu = ReadPdu();
resp = ParseResponse <LoginResponse>(pdu);
if (resp.StatusCode != LoginStatusCode.Success)
{
throw new LoginException("iSCSI Target indicated login failure: " + resp.StatusCode);
}
if (resp.TextData != null && resp.TextData.Length != 0)
{
if (resp.Continue)
{
MemoryStream ms = new MemoryStream();
ms.Write(resp.TextData, 0, resp.TextData.Length);
while (resp.Continue)
{
pdu = ReadPdu();
resp = ParseResponse <LoginResponse>(pdu);
ms.Write(resp.TextData, 0, resp.TextData.Length);
}
settings.ReadFrom(ms.GetBuffer(), 0, (int)ms.Length);
}
else
{
settings.ReadFrom(resp.TextData, 0, resp.TextData.Length);
}
authenticator.SetParameters(settings);
}
}
if (resp.NextStage != NextLoginStage)
{
throw new LoginException("iSCSI Target wants to transition to a different login stage: " + resp.NextStage + " (expected: " + NextLoginStage + ")");
}
_loginStage = resp.NextStage;
}
