/// <summary>
/// Constructor for AARE error.
/// </summary>
internal GXDLMSException(AssociationResult result, AcseServiceProvider diagnostic)
: base("Connection is " + GetResult(result) + ". " + GetDiagnostic(diagnostic))
{
Result = result;
Diagnostic = (byte)diagnostic;
HelpLink = "https://www.gurux.fi/Gurux.DLMS.ErrorCodes";
}
///<summary>
///Parse AARQ request that client send and returns AARE request.
/// </summary>
///<returns>
///Reply to the client.
///</returns>
private void HandleAarqRequest(GXByteBuffer data, GXDLMSConnectionEventArgs connectionInfo)
{
AssociationResult result = AssociationResult.Accepted;
Settings.CtoSChallenge = null;
if (!Settings.UseCustomChallenge)
{
Settings.StoCChallenge = null;
}
// Reset settings for wrapper.
if (Settings.InterfaceType == InterfaceType.WRAPPER)
{
Reset(true);
}
SourceDiagnostic diagnostic = GXAPDU.ParsePDU(Settings, Settings.Cipher, data, null);
if (diagnostic != SourceDiagnostic.None)
{
result = AssociationResult.PermanentRejected;
diagnostic = SourceDiagnostic.ApplicationContextNameNotSupported;
InvalidConnection(connectionInfo);
}
else
{
diagnostic = ValidateAuthentication(Settings.Authentication, Settings.Password);
if (diagnostic != SourceDiagnostic.None)
{
result = AssociationResult.PermanentRejected;
InvalidConnection(connectionInfo);
}
else if (Settings.Authentication > Authentication.Low)
{
// If High authentication is used.
if (!Settings.UseCustomChallenge)
{
Settings.StoCChallenge = GXSecure.GenerateChallenge(Settings.Authentication);
}
result = AssociationResult.Accepted;
diagnostic = SourceDiagnostic.AuthenticationRequired;
}
else
{
Connected(connectionInfo);
Settings.Connected = true;
}
}
Settings.IsAuthenticationRequired = diagnostic == SourceDiagnostic.AuthenticationRequired;
if (Settings.InterfaceType == Enums.InterfaceType.HDLC)
{
replyData.Set(GXCommon.LLCReplyBytes);
}
// Generate AARE packet.
GXAPDU.GenerateAARE(Settings, replyData, result, diagnostic, Settings.Cipher, null);
}
/// <summary>
/// Get resulat as a string.
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
static string GetResult(AssociationResult result)
{
if (result == AssociationResult.PermanentRejected)
{
return("permanently rejected");
}
if (result == AssociationResult.TransientRejected)
{
return("transient rejected");
}
throw new InvalidOperationException();
}
/// <summary>
/// Get resulat as a string.
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
static string GetResult(AssociationResult result)
{
if (result == AssociationResult.PermanentRejected)
{
return "permanently rejected";
}
if (result == AssociationResult.TransientRejected)
{
return "transient rejected";
}
throw new InvalidOperationException();
}
///<summary>
///Parse AARQ request that client send and returns AARE request.
/// </summary>
///<returns>
///Reply to the client.
///</returns>
private byte[][] HandleAarqRequest()
{
AssociationResult result = AssociationResult.Accepted;
Settings.CtoSChallenge = null;
if (!Settings.UseCustomChallenge)
{
Settings.StoCChallenge = null;
}
SourceDiagnostic diagnostic = GXAPDU.ParsePDU(Settings, Settings.Cipher, Reply.Data);
if (diagnostic != SourceDiagnostic.None)
{
result = AssociationResult.PermanentRejected;
diagnostic = SourceDiagnostic.ApplicationContextNameNotSupported;
}
else
{
// Check that user can access server.
diagnostic = ValidateAuthentication(Settings.Authentication, Settings.Password);
if (diagnostic != SourceDiagnostic.None)
{
result = AssociationResult.PermanentRejected;
}
else if (Settings.Authentication > Authentication.Low)
{
// If High authentication is used.
Settings.StoCChallenge = GXSecure.GenerateChallenge(Settings.Authentication);
result = AssociationResult.Accepted;
diagnostic = SourceDiagnostic.AuthenticationRequired;
}
}
// Generate AARE packet.
GXByteBuffer buff = new GXByteBuffer(150);
GXAPDU.GenerateAARE(Settings, buff, result, diagnostic, Settings.Cipher);
return(GXDLMS.SplitPdu(Settings, Command.Aare, 0, buff,
ErrorCode.Ok, DateTime.MinValue)[0]);
}
/// <summary>
/// Constructor for AARE error.
/// </summary>
internal GXDLMSException(AssociationResult result, SourceDiagnostic diagnostic)
: base("Connection is " + GetResult(result) + Environment.NewLine + GetDiagnostic(diagnostic))
{
Result = result;
Diagnostic = diagnostic;
}
///<summary>
///Server generates AARE message.
///</summary>
internal static void GenerateAARE(GXDLMSSettings settings, GXByteBuffer data,
AssociationResult result, SourceDiagnostic diagnostic, GXICipher cipher)
{
int offset = data.Position;
// Set AARE tag and length
data.SetUInt8(((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName)); //0x61
// Length is updated later.
data.SetUInt8(0);
GenerateApplicationContextName(settings, data, cipher);
//Result
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)BerType.Integer); //0xA2
data.SetUInt8(3); //len
data.SetUInt8(BerType.Integer); //Tag
//Choice for result (INTEGER, universal)
data.SetUInt8(1); //Len
data.SetUInt8((byte)result); //ResultValue
//SourceDiagnostic
data.SetUInt8(0xA3);
data.SetUInt8(5); //len
data.SetUInt8(0xA1); //Tag
data.SetUInt8(3); //len
data.SetUInt8(2); //Tag
//Choice for result (INTEGER, universal)
data.SetUInt8(1); //Len
data.SetUInt8((byte)diagnostic); //diagnostic
//SystemTitle
if (cipher != null && (cipher.IsCiphered() || settings.Authentication == Authentication.HighGMAC))
{
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApInvocationId);
data.SetUInt8((byte)(2 + cipher.SystemTitle.Length));
data.SetUInt8((byte)BerType.OctetString);
data.SetUInt8((byte)cipher.SystemTitle.Length);
data.Set(cipher.SystemTitle);
}
if (result != AssociationResult.PermanentRejected && diagnostic == SourceDiagnostic.AuthenticationRequired)
{
//Add server ACSE-requirenents field component.
data.SetUInt8(0x88);
data.SetUInt8(0x02); //Len.
data.SetUInt16(0x0780);
//Add tag.
data.SetUInt8(0x89);
data.SetUInt8(0x07);//Len
data.SetUInt8(0x60);
data.SetUInt8(0x85);
data.SetUInt8(0x74);
data.SetUInt8(0x05);
data.SetUInt8(0x08);
data.SetUInt8(0x02);
data.SetUInt8((byte)settings.Authentication);
//Add tag.
data.SetUInt8(0xAA);
data.SetUInt8((byte)(2 + settings.StoCChallenge.Length));//Len
data.SetUInt8((byte)BerType.Context);
data.SetUInt8((byte)settings.StoCChallenge.Length);
data.Set(settings.StoCChallenge);
}
//Add User Information
//Tag 0xBE
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation);
byte[] tmp = GetUserInformation(settings, cipher);
data.SetUInt8((byte)(2 + tmp.Length));
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8(BerType.OctetString);
//Length
data.SetUInt8((byte)tmp.Length);
data.Set(tmp);
data.SetUInt8((UInt16)(offset + 1), (byte)(data.Size - offset - 2));
}
///<summary>
///Parse APDU.
///</summary>
static internal SourceDiagnostic ParsePDU(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer buff)
{
// Get AARE tag and length
int tag = buff.GetUInt8();
if (settings.IsServer)
{
if (tag != ((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ProtocolVersion))
{
throw new Exception("Invalid tag.");
}
}
else
{
if (tag != ((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName))
{
throw new Exception("Invalid tag.");
}
}
int len = buff.GetUInt8();
int size = buff.Size - buff.Position;
if (len > size)
{
throw new Exception("Not enough data.");
}
AssociationResult resultComponent = AssociationResult.Accepted;
SourceDiagnostic resultDiagnosticValue = SourceDiagnostic.None;
while (buff.Position < buff.Size)
{
tag = buff.GetUInt8();
switch (tag)
{
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName: //0xA1
if (!ParseApplicationContextName(settings, buff))
{
throw new GXDLMSException(AssociationResult.PermanentRejected, SourceDiagnostic.ApplicationContextNameNotSupported);
}
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApTitle: ////Result 0xA2
//Get len.
if (buff.GetUInt8() != 3)
{
throw new Exception("Invalid tag.");
}
//Choice for result (INTEGER, universal)
if (buff.GetUInt8() != (byte)BerType.Integer)
{
throw new Exception("Invalid tag.");
}
//Get len.
if (buff.GetUInt8() != 1)
{
throw new Exception("Invalid tag.");
}
resultComponent = (AssociationResult)buff.GetUInt8();
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledAeQualifier: ////SourceDiagnostic 0xA3
len = buff.GetUInt8();
// ACSE service user tag.
tag = buff.GetUInt8();
len = buff.GetUInt8();
// Result source diagnostic component.
if (buff.GetUInt8() != (byte)BerType.Integer)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 1)
{
throw new Exception("Invalid tag.");
}
resultDiagnosticValue = (SourceDiagnostic)buff.GetUInt8();
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApInvocationId: ////Result 0xA4
//Get len.
if (buff.GetUInt8() != 0xA)
{
throw new Exception("Invalid tag.");
}
//Choice for result (Universal, Octetstring type)
if (buff.GetUInt8() != (byte)BerType.OctetString)
{
throw new Exception("Invalid tag.");
}
//responding-AP-title-field
//Get len.
len = buff.GetUInt8();
settings.SourceSystemTitle = new byte[len];
buff.Get(settings.SourceSystemTitle);
break;
//Client Challenge.
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CallingApTitle: //0xA6
len = buff.GetUInt8();
tag = buff.GetUInt8();
len = buff.GetUInt8();
settings.SourceSystemTitle = new byte[len];
buff.Get(settings.SourceSystemTitle);
break;
//Server Challenge.
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.SenderAcseRequirements: //0xAA
len = buff.GetUInt8();
tag = buff.GetUInt8();
len = buff.GetUInt8();
settings.StoCChallenge = new byte[len];
buff.Get(settings.StoCChallenge);
break;
case (byte)BerType.Context | (byte)PduType.SenderAcseRequirements: //0x8A
case (byte)BerType.Context | (byte)PduType.CallingApInvocationId: //0x88
//Get sender ACSE-requirements field component.
if (buff.GetUInt8() != 2)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != (byte)BerType.ObjectDescriptor)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x80)
{
throw new Exception("Invalid tag.");
}
break;
case (byte)BerType.Context | (byte)PduType.MechanismName: //0x8B
case (byte)BerType.Context | (byte)PduType.CallingAeInvocationId: //0x89
len = buff.GetUInt8();
if (buff.GetUInt8() != 0x60)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x85)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x74)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x05)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x08)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x02)
{
throw new Exception("Invalid tag.");
}
int tmp = buff.GetUInt8();
if (tmp < 0 || tmp > 5)
{
throw new Exception("Invalid tag.");
}
settings.Authentication = (Authentication)tmp;
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CallingAuthenticationValue: //0xAC
len = buff.GetUInt8();
// Get authentication information.
if (buff.GetUInt8() != 0x80)
{
throw new Exception("Invalid tag.");
}
len = buff.GetUInt8();
if (settings.Authentication < Authentication.HighMD5)
{
settings.Password = new byte[len];
buff.Get(settings.Password);
}
else
{
settings.CtoSChallenge = new byte[len];
buff.Get(settings.CtoSChallenge);
}
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation: //0xBE
if (resultComponent != AssociationResult.Accepted && resultDiagnosticValue != SourceDiagnostic.None)
{
throw new GXDLMSException(resultComponent, resultDiagnosticValue);
}
ParseUserInformation(settings, cipher, buff);
break;
default:
//Unknown tags.
System.Diagnostics.Debug.WriteLine("Unknown tag: " + tag + ".");
len = buff.GetUInt8();
buff.Position += (UInt16)len;
break;
}
}
return(resultDiagnosticValue);
}
///<summary>
///Server generates AARE message.
///</summary>
internal void GenerateAARE(List<byte> data, Authentication authentication, byte[] challenge, ushort maxReceivePDUSize, byte[] conformanceBlock, AssociationResult result, SourceDiagnostic diagnostic)
{
// Set AARE tag and length
data.Add(0x61);
ApplicationContextName.CodeData(data);
//Result
data.Add(0xA2);
data.Add(3); //len
data.Add(2); //Tag
//Choice for result (INTEGER, universal)
data.Add(1); //Len
data.Add((byte) result); //ResultValue
//SourceDiagnostic
data.Add(0xA3);
data.Add(5); //len
data.Add(0xA1); //Tag
data.Add(3); //len
data.Add(2); //Tag
//Choice for result (INTEGER, universal)
data.Add(1); //Len
data.Add((byte)diagnostic); //diagnostic
if (diagnostic == SourceDiagnostic.AuthenticationRequired)
{
//Add server ACSE-requirenents field component.
data.Add(0x88);
data.Add(0x02); //Len.
GXCommon.SetUInt16(0x0780, data);
//Add tag.
data.Add(0x89);
data.Add(0x07);//Len
data.Add(0x60);
data.Add(0x85);
data.Add(0x74);
data.Add(0x05);
data.Add(0x08);
data.Add(0x02);
data.Add((byte) authentication);
//Add tag.
data.Add(0xAA);
data.Add((byte) (2 + challenge.Length));//Len
data.Add(0x80);
data.Add((byte) challenge.Length);
data.AddRange(challenge);
}
//Add User Information
data.Add(0xBE); //Tag
data.Add(0x10); //Length for AARQ user field
data.Add(0x04); //Coding the choice for user-information (Octet STRING, universal)
data.Add(0xE); //Length
data.Add(GXCommon.InitialResponce); // Tag for xDLMS-Initiate response
data.Add(0x00); // Usage field for the response allowed component (not used)
data.Add(6); // DLMSVersioNumber
data.Add(0x5F);
data.Add(0x1F);
data.Add(0x04);// length of the conformance block
data.Add(0x00);// encoding the number of unused bits in the bit string
data.AddRange(conformanceBlock);
GXCommon.SetUInt16(maxReceivePDUSize, data);
//VAA Name VAA name (0x0007 for LN referencing and 0xFA00 for SN)
if (UseLN)
{
GXCommon.SetUInt16(0x0007, data);
}
else
{
GXCommon.SetUInt16(0xFA00, data);
}
data.Insert(1, (byte) (data.Count - 1));
}
///<summary>
///EncodeData
///</summary>
internal void EncodeData(byte[] buff, ref int index)
{
// Get AARE tag and length
int tag = buff[index++];
if (tag != 0x61 && tag != 0x60 && tag != 0x81 && tag != 0x80)
{
throw new Exception("Invalid tag.");
}
int len = buff[index++];
int size = buff.Length - index;
if (len > size)
{
throw new Exception("Not enought data.");
}
while (index < buff.Length)
{
tag = buff[index];
if (tag == 0xA1)
{
ApplicationContextName.EncodeData(buff, ref index);
}
else if (tag == 0xBE)
{
if (ResultValue != AssociationResult.Accepted && ResultDiagnosticValue != SourceDiagnostic.None)
{
return;
}
UserInformation.EncodeData(buff, ref index);
}
else if (tag == 0xA2) //Result
{
tag = buff[index++];
len = buff[index++];
//Choice for result (INTEGER, universal)
tag = buff[index++];
len = buff[index++];
ResultValue = (AssociationResult)buff[index++];
}
else if (tag == 0xA3) //SourceDiagnostic
{
tag = buff[index++];
len = buff[index++];
// ACSE service user tag.
tag = buff[index++];
len = buff[index++];
// Result source diagnostic component.
tag = buff[index++];
len = buff[index++];
ResultDiagnosticValue = (SourceDiagnostic)buff[index++];
}
else if (tag == 0x8A || tag == 0x88) //Authentication.
{
tag = buff[index++];
//Get sender ACSE-requirenents field component.
if (buff[index++] != 2)
{
throw new Exception("Invalid tag.");
}
int val = GXCommon.GetUInt16(buff, ref index);
if (val != 0x0780 && val != 0x0680)
{
throw new Exception("Invalid tag.");
}
}
else if (tag == 0xAA) //Server Challenge.
{
tag = buff[index++];
len = buff[index++];
++index;
len = buff[index++];
//Get challenge
index += len;
}
else if (tag == 0x8B || tag == 0x89) //Authentication.
{
tag = buff[index++];
len = buff[index++];
bool IsAuthenticationTag = len > 7;
if (buff[index++] != 0x60)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x85)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x74)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x05)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x08)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x02)
{
throw new Exception("Invalid tag.");
}
int tmp = buff[index++];
if (tmp < 0 || tmp > 5)
{
throw new Exception("Invalid tag.");
}
if (IsAuthenticationTag)
{
Authentication = (Authentication)tmp;
byte tag2 = buff[index++];
if (tag2 != 0xAC && tag2 != 0xAA)
{
throw new Exception("Invalid tag.");
}
len = buff[index++];
//Get authentication information.
if (buff[index++] != 0x80)
{
throw new Exception("Invalid tag.");
}
len = buff[index++];
Password = new byte[len];
Array.Copy(buff, index, Password, 0, len);
index += len;
}
else
{
Authentication = Authentication.None;
}
}
//Unknown tags.
else
{
tag = buff[index++];
len = buff[index++];
if (Tags != null)
{
GXDLMSTag tmp = new GXDLMSTag();
tmp.ID = tag;
tmp.Data = new byte[len];
tmp.Data = GXCommon.Swap(buff, index, len);
Tags.Add(tmp);
}
index += len;
}
}
}
///<summary>
///Server generates AARE message.
///</summary>
internal static void GenerateAARE(GXDLMSSettings settings, GXByteBuffer data,
AssociationResult result, SourceDiagnostic diagnostic, GXICipher cipher,
GXByteBuffer encryptedData)
{
int offset = data.Size;
// Set AARE tag and length
data.SetUInt8(((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName)); //0x61
// Length is updated later.
data.SetUInt8(0);
GenerateApplicationContextName(settings, data, cipher);
//Result
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)BerType.Integer);//0xA2
data.SetUInt8(3); //len
data.SetUInt8(BerType.Integer); //Tag
//Choice for result (INTEGER, universal)
data.SetUInt8(1); //Len
data.SetUInt8((byte)result); //ResultValue
//SourceDiagnostic
data.SetUInt8(0xA3);
data.SetUInt8(5); //len
data.SetUInt8(0xA1); //Tag
data.SetUInt8(3); //len
data.SetUInt8(2); //Tag
//Choice for result (INTEGER, universal)
data.SetUInt8(1); //Len
data.SetUInt8((byte)diagnostic); //diagnostic
//SystemTitle
if (cipher != null && (cipher.IsCiphered() || settings.Authentication == Authentication.HighGMAC))
{
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApInvocationId);
data.SetUInt8((byte)(2 + cipher.SystemTitle.Length));
data.SetUInt8((byte)BerType.OctetString);
data.SetUInt8((byte)cipher.SystemTitle.Length);
data.Set(cipher.SystemTitle);
}
if (result != AssociationResult.PermanentRejected && diagnostic == SourceDiagnostic.AuthenticationRequired)
{
//Add server ACSE-requirenents field component.
data.SetUInt8(0x88);
data.SetUInt8(0x02); //Len.
data.SetUInt16(0x0780);
//Add tag.
data.SetUInt8(0x89);
data.SetUInt8(0x07);//Len
data.SetUInt8(0x60);
data.SetUInt8(0x85);
data.SetUInt8(0x74);
data.SetUInt8(0x05);
data.SetUInt8(0x08);
data.SetUInt8(0x02);
data.SetUInt8((byte)settings.Authentication);
//Add tag.
data.SetUInt8(0xAA);
data.SetUInt8((byte)(2 + settings.StoCChallenge.Length));//Len
data.SetUInt8((byte)BerType.Context);
data.SetUInt8((byte)settings.StoCChallenge.Length);
data.Set(settings.StoCChallenge);
}
byte[] tmp;
//Add User Information
//Tag 0xBE
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation);
if (encryptedData != null && encryptedData.Size != 0)
{
GXByteBuffer tmp2 = new GXByteBuffer((UInt16)(2 + encryptedData.Size));
tmp2.SetUInt8((byte)Command.GloInitiateResponse);
GXCommon.SetObjectCount(encryptedData.Size, tmp2);
tmp2.Set(encryptedData);
tmp = tmp2.Array();
}
else
{
tmp = GetUserInformation(settings, cipher);
}
data.SetUInt8((byte)(2 + tmp.Length));
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8(BerType.OctetString);
//Length
data.SetUInt8((byte)tmp.Length);
data.Set(tmp);
data.SetUInt8((UInt16)(offset + 1), (byte)(data.Size - offset - 2));
}
/// <summary>
/// Constructor for AARE error.
/// </summary>
internal GXDLMSException(AssociationResult result, SourceDiagnostic diagnostic)
: base("Connection is " + GetResult(result) + ". " + GetDiagnostic(diagnostic))
{
Result = result;
Diagnostic = (byte)diagnostic;
}
/// <summary>
/// Constructor for AARE error.
/// </summary>
internal GXDLMSException(AssociationResult result, AcseServiceProvider diagnostic)
: base("Connection is " + GetResult(result) + ". " + GetDiagnostic(diagnostic))
{
Result = result;
Diagnostic = (byte)diagnostic;
}
///<summary>
///Server generates AARE message.
///</summary>
internal void GenerateAARE(List <byte> data, Authentication authentication, byte[] challenge, ushort maxReceivePDUSize, byte[] conformanceBlock, AssociationResult result, SourceDiagnostic diagnostic)
{
// Set AARE tag and length
data.Add(0x61);
ApplicationContextName.CodeData(data);
//Result
data.Add(0xA2);
data.Add(3); //len
data.Add(2); //Tag
//Choice for result (INTEGER, universal)
data.Add(1); //Len
data.Add((byte)result); //ResultValue
//SourceDiagnostic
data.Add(0xA3);
data.Add(5); //len
data.Add(0xA1); //Tag
data.Add(3); //len
data.Add(2); //Tag
//Choice for result (INTEGER, universal)
data.Add(1); //Len
data.Add((byte)diagnostic); //diagnostic
if (diagnostic == SourceDiagnostic.AuthenticationRequired)
{
//Add server ACSE-requirenents field component.
data.Add(0x88);
data.Add(0x02); //Len.
GXCommon.SetUInt16(0x0780, data);
//Add tag.
data.Add(0x89);
data.Add(0x07);//Len
data.Add(0x60);
data.Add(0x85);
data.Add(0x74);
data.Add(0x05);
data.Add(0x08);
data.Add(0x02);
data.Add((byte)authentication);
//Add tag.
data.Add(0xAA);
data.Add((byte)(2 + challenge.Length)); //Len
data.Add(0x80);
data.Add((byte)challenge.Length);
data.AddRange(challenge);
}
//Add User Information
data.Add(0xBE); //Tag
data.Add(0x10); //Length for AARQ user field
data.Add(0x04); //Coding the choice for user-information (Octet STRING, universal)
data.Add(0xE); //Length
data.Add(GXCommon.InitialResponce); // Tag for xDLMS-Initiate response
data.Add(0x00); // Usage field for the response allowed component (not used)
data.Add(6); // DLMSVersioNumber
data.Add(0x5F);
data.Add(0x1F);
data.Add(0x04); // length of the conformance block
data.Add(0x00); // encoding the number of unused bits in the bit string
data.AddRange(conformanceBlock);
GXCommon.SetUInt16(maxReceivePDUSize, data);
//VAA Name VAA name (0x0007 for LN referencing and 0xFA00 for SN)
if (UseLN)
{
GXCommon.SetUInt16(0x0007, data);
}
else
{
GXCommon.SetUInt16(0xFA00, data);
}
data.Insert(1, (byte)(data.Count - 1));
}
///<summary>
///EncodeData
///</summary>
internal void EncodeData(byte[] buff, ref int index)
{
// Get AARE tag and length
int tag = buff[index++];
if (tag != 0x61 && tag != 0x60 && tag != 0x81 && tag != 0x80)
{
throw new Exception("Invalid tag.");
}
int len = buff[index++];
int size = buff.Length - index;
if (len > size)
{
throw new Exception("Not enough data.");
}
while (index < buff.Length)
{
tag = buff[index];
if (tag == 0xA1)
{
ApplicationContextName.EncodeData(buff, ref index);
}
else if (tag == 0xBE)
{
if (ResultValue != AssociationResult.Accepted && ResultDiagnosticValue != SourceDiagnostic.None)
{
return;
}
UserInformation.EncodeData(buff, ref index);
}
else if (tag == 0xA2) //Result
{
tag = buff[index++];
len = buff[index++];
//Choice for result (INTEGER, universal)
tag = buff[index++];
len = buff[index++];
ResultValue = (AssociationResult)buff[index++];
}
else if (tag == 0xA3) //SourceDiagnostic
{
tag = buff[index++];
len = buff[index++];
// ACSE service user tag.
tag = buff[index++];
len = buff[index++];
// Result source diagnostic component.
tag = buff[index++];
len = buff[index++];
ResultDiagnosticValue = (SourceDiagnostic)buff[index++];
}
else if (tag == 0x8A || tag == 0x88) //Authentication.
{
tag = buff[index++];
//Get sender ACSE-requirements field component.
if (buff[index++] != 2)
{
throw new Exception("Invalid tag.");
}
int val = GXCommon.GetUInt16(buff, ref index);
if (val != 0x0780 && val != 0x0680)
{
throw new Exception("Invalid tag.");
}
}
else if (tag == 0xAA) //Server Challenge.
{
tag = buff[index++];
len = buff[index++];
++index;
len = buff[index++];
//Get challenge and save it to the PW.
Password = new byte[len];
Array.Copy(buff, index, Password, 0, len);
index += len;
}
else if (tag == 0xAC) //Password.
{
tag = buff[index++];
len = buff[index++];
//Get authentication information.
if (buff[index++] != 0x80)
{
throw new Exception("Invalid tag.");
}
len = buff[index++];
//Get password.
Password = new byte[len];
Array.Copy(buff, index, Password, 0, len);
index += len;
}
else if (tag == 0x8B || tag == 0x89) //Authentication.
{
tag = buff[index++];
len = buff[index++];
if (buff[index++] != 0x60)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x85)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x74)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x05)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x08)
{
throw new Exception("Invalid tag.");
}
if (buff[index++] != 0x02)
{
throw new Exception("Invalid tag.");
}
int tmp = buff[index++];
if (tmp < 0 || tmp > 5)
{
throw new Exception("Invalid tag.");
}
Authentication = (Authentication)tmp;
}
//Unknown tags.
else
{
tag = buff[index++];
len = buff[index++];
if (Tags != null)
{
GXDLMSTag tmp = new GXDLMSTag();
tmp.ID = tag;
tmp.Data = new byte[len];
tmp.Data = GXCommon.Swap(buff, index, len);
Tags.Add(tmp);
}
index += len;
}
}
}
/// <summary>
/// Constructor for AARE error.
/// </summary>
internal GXDLMSException(AssociationResult result, SourceDiagnostic diagnostic)
: base("Connection is " + GetResult(result) + ". " + GetDiagnostic(diagnostic))
{
Result = result;
Diagnostic = diagnostic;
}
