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)); }