/// <summary>
/// Creates a new instance of this class.
/// </summary>
/// <param name="ipProtocol">The IP portocol</param>
/// <param name="ipaSource">The original source address</param>
/// <param name="ipaTranslatedSource">The translated source address</param>
/// <param name="ipaDestination">The destination address</param>
/// <param name="iSourcePort">The original source port</param>
/// <param name="iTranslatedSourcePort">The translated source port</param>
/// <param name="iDestinationPort">The destination port</param>
public NATEntry(IP.IPProtocol ipProtocol, IPAddress ipaSource, IPAddress ipaTranslatedSource, IPAddress ipaDestination, int iSourcePort, int iTranslatedSourcePort, int iDestinationPort)
{
this.ipProtocol = ipProtocol;
this.ipaOriginalSource = ipaSource;
this.ipaTranslatedSource = ipaTranslatedSource;
this.ipaDestination = ipaDestination;
this.iOriginalSourcePort = iSourcePort;
this.iTranslatedSourcePort = iTranslatedSourcePort;
this.iDestinationPort = iDestinationPort;
}
// Seen from inside
private NATEntry CreateTranslationEntry(IPAddress ipaSource, IPAddress ipaDestination, int iSourcePort, int iDestinationPort, IP.IPProtocol iIPProtocol)
{
int iTranslatedSourcePort = 0;
NATEntry eNatEntry;
lock (lExternalRange)
{
foreach (IPAddress ipa in lExternalAddressPool)
{
if (iIPProtocol == IP.IPProtocol.UDP || iIPProtocol == IP.IPProtocol.TCP)
{
iTranslatedSourcePort = iRangeStartPort;
}
do
{
if (GetReTranslationEntry(ipa, ipaDestination, iTranslatedSourcePort, iDestinationPort, iIPProtocol) == null)
{
eNatEntry = new NATEntry(iIPProtocol, ipaSource, ipa, ipaDestination, iSourcePort, iTranslatedSourcePort, iDestinationPort);
eNatEntry.TTL = iNATTimer;
lock (lNATDatabase)
{
lNATDatabase.Add(eNatEntry);
}
InvokeExternalAsync(NATEntryCreated, new NATEventArgs(eNatEntry));
return(eNatEntry);
}
iTranslatedSourcePort++;
}while ((iIPProtocol == IP.IPProtocol.UDP || iIPProtocol == IP.IPProtocol.TCP) && iRangeStartPort < iRangeEndPort);
}
}
throw new Exception("A NAT entry could not be created cause the pools are exhausted. (Source: " + ipaSource + "/" + iSourcePort + ", Destination: " + ipaDestination + "/" + iDestinationPort + ", Protocol: " + iIPProtocol.ToString());
}
//Seen from inside
private NATEntry GetReTranslationEntry(IPAddress ipaTranslatedSource, IPAddress ipaDestination, int iTranslatedSourcePort, int iDestinationPort, IP.IPProtocol iProtocol)
{
lock (lNATDatabase)
{
foreach (NATEntry ne in lNATDatabase)
{
if (ne.TranslatedSourceAddress.Equals(ipaTranslatedSource) &&
ne.DestinationAddress.Equals(ipaDestination) &&
ne.TranslatedSourcePort.Equals(iTranslatedSourcePort) &&
ne.DestinationPort.Equals(iDestinationPort) &&
ne.IPProtocol.Equals(iProtocol))
{
ne.TTL = iNATTimer;
return(ne);
}
}
}
return(null);
}
