internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
DnsDomainName mainNameServer;
int domainNameLength;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out mainNameServer, out domainNameLength))
{
return(null);
}
offsetInDns += domainNameLength;
length -= domainNameLength;
DnsDomainName responsibleMailbox;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out responsibleMailbox, out domainNameLength))
{
return(null);
}
offsetInDns += domainNameLength;
length -= domainNameLength;
if (length != ConstantPartLength)
{
return(null);
}
uint serial = dns.ReadUInt(offsetInDns + Offset.Serial, Endianity.Big);;
uint refresh = dns.ReadUInt(offsetInDns + Offset.Refresh, Endianity.Big);;
uint retry = dns.ReadUInt(offsetInDns + Offset.Retry, Endianity.Big);;
uint expire = dns.ReadUInt(offsetInDns + Offset.Expire, Endianity.Big);;
uint minimumTtl = dns.ReadUInt(offsetInDns + Offset.MinimumTtl, Endianity.Big);;
return(new DnsResourceDataStartOfAuthority(mainNameServer, responsibleMailbox, serial, refresh, retry, expire, minimumTtl));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < ConstantPartLength)
{
return(null);
}
DnsType typeCovered = (DnsType)dns.ReadUShort(offsetInDns + Offset.TypeCovered, Endianity.Big);
DnsAlgorithm algorithm = (DnsAlgorithm)dns[offsetInDns + Offset.Algorithm];
byte labels = dns[offsetInDns + Offset.Labels];
uint originalTtl = dns.ReadUInt(offsetInDns + Offset.OriginalTtl, Endianity.Big);
uint signatureExpiration = dns.ReadUInt(offsetInDns + Offset.SignatureExpiration, Endianity.Big);
uint signatureInception = dns.ReadUInt(offsetInDns + Offset.SignatureInception, Endianity.Big);
ushort keyTag = dns.ReadUShort(offsetInDns + Offset.KeyTag, Endianity.Big);
offsetInDns += ConstantPartLength;
length -= ConstantPartLength;
DnsDomainName signersName;
int signersNameLength;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out signersName, out signersNameLength))
{
return(null);
}
offsetInDns += signersNameLength;
length -= signersNameLength;
DataSegment signature = dns.Subsegment(offsetInDns, length);
return(new DnsResourceDataSignature(typeCovered, algorithm, labels, originalTtl, signatureExpiration, signatureInception, keyTag, signersName, signature));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < ConstantPartLength + DnsDomainName.RootLength)
{
return(null);
}
DnsDomainName algorithm;
int algorithmLength;
if (!DnsDomainName.TryParse(dns, offsetInDns, length - ConstantPartLength, out algorithm, out algorithmLength))
{
return(null);
}
offsetInDns += algorithmLength;
length -= algorithmLength;
if (length < ConstantPartLength)
{
return(null);
}
uint inception = dns.ReadUInt(offsetInDns + OffsetAfterAlgorithm.Inception, Endianity.Big);
uint expiration = dns.ReadUInt(offsetInDns + OffsetAfterAlgorithm.Expiration, Endianity.Big);
DnsTransactionKeyMode mode = (DnsTransactionKeyMode)dns.ReadUShort(offsetInDns + OffsetAfterAlgorithm.Mode, Endianity.Big);
DnsResponseCode error = (DnsResponseCode)dns.ReadUShort(offsetInDns + OffsetAfterAlgorithm.Error, Endianity.Big);
int keySize = dns.ReadUShort(offsetInDns + OffsetAfterAlgorithm.KeySize, Endianity.Big);
if (length < ConstantPartLength + keySize)
{
return(null);
}
DataSegment key = dns.Subsegment(offsetInDns + OffsetAfterAlgorithm.KeyData, keySize);
int totalReadAfterAlgorithm = OffsetAfterAlgorithm.KeyData + keySize;
offsetInDns += totalReadAfterAlgorithm;
length -= totalReadAfterAlgorithm;
int otherSize = dns.ReadUShort(offsetInDns, Endianity.Big);
if (length != sizeof(ushort) + otherSize)
{
return(null);
}
DataSegment other = dns.Subsegment(offsetInDns + sizeof(ushort), otherSize);
return(new DnsResourceDataTransactionKey(algorithm, inception, expiration, mode, error, key, other));
}
