| static private GenerateAARE ( GXDLMSSettings settings, GXByteBuffer data, AssociationResult result, SourceDiagnostic diagnostic, GXICipher cipher, GXByteBuffer encryptedData ) : void | ||
| settings | GXDLMSSettings | |
| data | GXByteBuffer | |
| result | AssociationResult | |
| diagnostic | SourceDiagnostic | |
| cipher | GXICipher | |
| encryptedData | GXByteBuffer | |
| return | void | |
/// <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>
/// 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);
}