/// <summary>
/// Parse AARQ request that client send and returns AARE request.
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
byte[] HandleAARQRequest(byte[] data)
{
int index = 0, error;
byte frame;
List<byte> arr = new List<byte>(data);
bool packetFull, wrongCrc;
byte command;
m_Base.GetDataFromFrame(arr, index, out frame, true, out error, false, out packetFull, out wrongCrc, out command, false);
if (!packetFull)
{
throw new GXDLMSException("Not enough data to parse frame.");
}
if (wrongCrc)
{
throw new GXDLMSException("Wrong Checksum.");
}
GXAPDU aarq = new GXAPDU(null);
aarq.UseLN = this.UseLogicalNameReferencing;
int pos = 0;
aarq.EncodeData(arr.ToArray(), ref pos);
AssociationResult result = AssociationResult.Accepted;
SourceDiagnostic diagnostic = SourceDiagnostic.None;
m_Base.Authentication = aarq.Authentication;
m_Base.CtoSChallenge = null;
m_Base.StoCChallenge = null;
if (aarq.Authentication >= Authentication.High)
{
m_Base.CtoSChallenge = aarq.Password;
}
if (this.UseLogicalNameReferencing != aarq.UseLN)
{
result = AssociationResult.PermanentRejected;
diagnostic = SourceDiagnostic.ApplicationContextNameNotSupported;
}
else
{
GXAuthentication auth = null;
foreach (GXAuthentication it in Authentications)
{
if (it.Type == aarq.Authentication)
{
auth = it;
break;
}
}
if (auth == null)
{
result = AssociationResult.PermanentRejected;
//If authentication is required.
if (aarq.Authentication == Authentication.None)
{
diagnostic = SourceDiagnostic.AuthenticationRequired;
}
else
{
diagnostic = SourceDiagnostic.AuthenticationMechanismNameNotRecognised;
}
}
//If authentication is used check pw.
else if (aarq.Authentication != Authentication.None)
{
if (aarq.Authentication == Authentication.Low)
{
//If Low authentication is used and pw don't match.
if (aarq.Password == null || string.Compare(auth.Password, ASCIIEncoding.ASCII.GetString(aarq.Password)) != 0)
{
result = AssociationResult.PermanentRejected;
diagnostic = SourceDiagnostic.AuthenticationFailure;
}
}
else //If High authentication is used.
{
m_Base.StoCChallenge = GXDLMS.GenerateChallenge();
System.Diagnostics.Debug.WriteLine("StoC: " + BitConverter.ToString(m_Base.StoCChallenge));
result = AssociationResult.Accepted;
diagnostic = SourceDiagnostic.AuthenticationRequired;
}
}
}
//Generate AARE packet.
List<byte> buff = new List<byte>();
byte[] conformanceBlock;
if (UseLogicalNameReferencing)
{
conformanceBlock = LNSettings.m_ConformanceBlock;
}
else
{
conformanceBlock = SNSettings.m_ConformanceBlock;
}
aarq.GenerateAARE(buff, aarq.Authentication, m_Base.StoCChallenge, MaxReceivePDUSize, conformanceBlock, result, diagnostic);
if (this.InterfaceType == InterfaceType.General)
{
buff.InsertRange(0, Gurux.DLMS.Internal.GXCommon.LLCReplyBytes);
}
m_Base.ExpectedFrame = 0;
m_Base.FrameSequence = -1;
m_Base.ReceiveSequenceNo = 1;
m_Base.SendSequenceNo = 0;
return m_Base.AddFrame(m_Base.GenerateIFrame(), false, buff, 0, buff.Count);
}
/// <summary>
/// Parses the AARE response.
/// </summary>
/// <param name="reply"></param>
/// <remarks>
/// Parse method will update the following data:
/// <ul>
/// <li>DLMSVersion</li>
/// <li>MaxReceivePDUSize</li>
/// <li>UseLogicalNameReferencing</li>
/// <li>LNSettings or SNSettings</li>
/// </ul>
/// LNSettings or SNSettings will be updated, depending on the referencing,
/// Logical name or Short name.
/// </remarks>
/// <returns>The AARE response</returns>
/// <seealso cref="AARQRequest"/>
/// <seealso cref="UseLogicalNameReferencing"/>
/// <seealso cref="DLMSVersion"/>
/// <seealso cref="MaxReceivePDUSize"/>
/// <seealso cref="LNSettings"/>
/// <seealso cref="SNSettings"/>
public GXDLMSTagCollection ParseAAREResponse(byte[] reply)
{
byte frame;
int error, index = 0;
List<byte> arr = new List<byte>(reply);
bool packetFull, wrongCrc;
byte command;
m_Base.GetDataFromFrame(arr, index, out frame, true, out error, false, out packetFull, out wrongCrc, out command, false);
if (!packetFull)
{
throw new GXDLMSException("Not enough data to parse frame.");
}
if (wrongCrc)
{
throw new GXDLMSException("Wrong Checksum.");
}
//Parse AARE data.
GXDLMSTagCollection Tags = new GXDLMSTagCollection();
GXAPDU pdu = new GXAPDU(Tags);
pdu.EncodeData(arr.ToArray(), ref index);
UseLogicalNameReferencing = pdu.UseLN;
if (UseLogicalNameReferencing)
{
System.Diagnostics.Debug.WriteLine("--- Logical Name settings are---\r\n");
}
else
{
System.Diagnostics.Debug.WriteLine("--- Short Name settings are---\r\n");
}
m_Base.StoCChallenge = pdu.Password;
AssociationResult ret = pdu.ResultComponent;
if (ret == AssociationResult.Accepted)
{
System.Diagnostics.Debug.WriteLine("- Client has accepted connection.");
if (UseLogicalNameReferencing)
{
m_Base.LNSettings = new GXDLMSLNSettings(pdu.UserInformation.ConformanceBlock);
}
else
{
m_Base.SNSettings = new GXDLMSSNSettings(pdu.UserInformation.ConformanceBlock);
}
MaxReceivePDUSize = pdu.UserInformation.MaxReceivePDUSize;
DLMSVersion = pdu.UserInformation.DLMSVersioNumber;
}
else
{
m_Base.LNSettings = null;
m_Base.SNSettings = null;
throw new GXDLMSException(ret, pdu.ResultDiagnosticValue);
}
IsAuthenticationRequired = pdu.ResultDiagnosticValue == SourceDiagnostic.AuthenticationRequired;
if (IsAuthenticationRequired)
{
System.Diagnostics.Debug.WriteLine("Authentication is used.");
}
System.Diagnostics.Debug.WriteLine("- Server max PDU size is " + MaxReceivePDUSize);
System.Diagnostics.Debug.WriteLine("- Value of quality of service is " + ValueOfQualityOfService);
System.Diagnostics.Debug.WriteLine("- Server DLMS version number is " + DLMSVersion);
if (DLMSVersion != 6)
{
throw new GXDLMSException("Invalid DLMS version number.");
}
System.Diagnostics.Debug.WriteLine("- Number of unused bits is " + NumberOfUnusedBits);
return Tags;
}
/// <summary>
/// Parse AARQ request that cliend send and returns AARE request.
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
byte[] HandleAARQRequest(byte[] data)
{
int index = 0, error;
byte frame;
List<byte> arr = new List<byte>(data);
bool packetFull, wrongCrc;
byte command;
m_Base.GetDataFromFrame(arr, index, out frame, true, out error, false, out packetFull, out wrongCrc, out command);
if (!packetFull)
{
throw new GXDLMSException("Not enought data to parse frame.");
}
if (wrongCrc)
{
throw new GXDLMSException("Wrong Checksum.");
}
GXAPDU aarq = new GXAPDU(null);
aarq.UseLN = this.UseLogicalNameReferencing;
int pos = 0;
aarq.EncodeData(arr.ToArray(), ref pos);
AssociationResult result = AssociationResult.Accepted;
SourceDiagnostic diagnostic = SourceDiagnostic.None;
if (this.UseLogicalNameReferencing != aarq.UseLN)
{
result = AssociationResult.PermanentRejected;
diagnostic = SourceDiagnostic.ApplicationContextNameNotSupported;
}
else
{
GXAuthentication auth = null;
foreach (GXAuthentication it in Authentications)
{
if (it.Type == aarq.Authentication)
{
auth = it;
break;
}
}
if (auth == null)
{
result = AssociationResult.PermanentRejected;
//If authentication is required.
if (aarq.Authentication == Authentication.None)
{
diagnostic = SourceDiagnostic.AuthenticationRequired;
}
else
{
diagnostic = SourceDiagnostic.AuthenticationMechanismNameNotRecognised;
}
}
//If authentication is used check pw.
else if (aarq.Authentication != Authentication.None && auth.Password != aarq.Password && string.IsNullOrEmpty(auth.Password) != string.IsNullOrEmpty((aarq.Password)))
{
result = AssociationResult.PermanentRejected;
diagnostic = SourceDiagnostic.AuthenticationFailure;
}
}
//Generate AARE packet.
List<byte> buff = new List<byte>();
byte[] conformanceBlock;
if (UseLogicalNameReferencing)
{
conformanceBlock = LNSettings.m_ConformanceBlock;
}
else
{
conformanceBlock = SNSettings.m_ConformanceBlock;
}
aarq.GenerateAARE(buff, MaxReceivePDUSize, conformanceBlock, result, diagnostic);
if (this.InterfaceType == InterfaceType.General)
{
buff.InsertRange(0, new byte[] { 0xE6, 0xE7, 0x00 });
}
m_Base.ExpectedFrame = 0;
m_Base.FrameSequence = -1;
return m_Base.AddFrame(m_Base.GenerateIFrame(), false, buff, 0, buff.Count);
}