internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < MinimumLength)
{
return(null);
}
byte prefixLength = dns[offsetInDns + Offset.PrefixLength];
if (prefixLength > MaxPrefixLength)
{
return(null);
}
offsetInDns += ConstantPartLength;
length -= ConstantPartLength;
int addressSuffixLength = CalculateAddressSuffixLength(prefixLength);
if (length < addressSuffixLength)
{
return(null);
}
IpV6Address addressSuffix = new IpV6Address((UInt128)dns.ReadUnsignedBigInteger(offsetInDns, addressSuffixLength, Endianity.Big));
offsetInDns += addressSuffixLength;
length -= addressSuffixLength;
if (IsAddressSuffixTooSmall(prefixLength, addressSuffix) || IsAddressSuffixTooBig(prefixLength, addressSuffix))
{
return(null);
}
DnsDomainName prefixName;
int prefixNameLength;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out prefixName, out prefixNameLength))
{
return(null);
}
if (prefixNameLength != length)
{
return(null);
}
return(new DnsResourceDataA6(prefixLength, addressSuffix, prefixName));
}
private static bool TryReadLabels(DnsDatagram dns, int offsetInDns, out int numBytesRead, List <DataSegment> labels)
{
numBytesRead = 0;
byte labelLength;
do
{
if (offsetInDns >= dns.Length)
{
return(false); // Can't read label's length.
}
labelLength = dns[offsetInDns];
++numBytesRead;
if (labelLength > MaxLabelLength)
{
// Compression.
if (offsetInDns + 1 >= dns.Length)
{
return(false); // Can't read compression pointer.
}
int newOffsetInDns = dns.ReadUShort(offsetInDns, Endianity.Big) & OffsetMask;
if (newOffsetInDns >= offsetInDns)
{
return(false); // Can't handle pointers that are not back pointers.
}
++numBytesRead;
int internalBytesRead;
return(TryReadLabels(dns, newOffsetInDns, out internalBytesRead, labels));
}
if (labelLength != 0)
{
++offsetInDns;
if (offsetInDns + labelLength >= dns.Length)
{
return(false); // Can't read label.
}
labels.Add(dns.Subsegment(offsetInDns, labelLength));
numBytesRead += labelLength;
offsetInDns += labelLength;
}
} while (labelLength != 0);
return(true);
}
internal static List <DnsDomainName> ReadDomainNames(DnsDatagram dns, int offsetInDns, int length, int numExpected = 0)
{
List <DnsDomainName> list = new List <DnsDomainName>(numExpected);
while (length != 0)
{
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out numBytesRead))
{
return((List <DnsDomainName>)null);
}
offsetInDns += numBytesRead;
length -= numBytesRead;
list.Add(domainName);
}
return(list);
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
int numBytesRead;
DnsDomainName domainName;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out numBytesRead))
{
return(null);
}
length -= numBytesRead;
if (length != 0)
{
return(null);
}
return(new DnsResourceDataDomainName(domainName));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < 17)
{
return((DnsResourceData)null);
}
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length - 16, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
offsetInDns += numBytesRead;
length -= numBytesRead;
if (length < 16)
{
return((DnsResourceData)null);
}
UInt48 timeSigned = dns.ReadUInt48(offsetInDns, Endianity.Big);
ushort fudge = dns.ReadUShort(offsetInDns + 6, Endianity.Big);
int length1 = (int)dns.ReadUShort(offsetInDns + 8, Endianity.Big);
if (length < 16 + length1)
{
return((DnsResourceData)null);
}
DataSegment messageAuthenticationCode = dns.Subsegment(offsetInDns + 10, length1);
int num = 10 + length1;
offsetInDns += num;
length -= num;
ushort originalId = dns.ReadUShort(offsetInDns, Endianity.Big);
DnsResponseCode error = (DnsResponseCode)dns.ReadUShort(offsetInDns + 2, Endianity.Big);
int length2 = (int)dns.ReadUShort(offsetInDns + 4, Endianity.Big);
if (length != 6 + length2)
{
return((DnsResourceData)null);
}
DataSegment other = dns.Subsegment(offsetInDns + 6, length2);
return((DnsResourceData) new DnsResourceDataTransactionSignature(domainName, timeSigned, fudge, messageAuthenticationCode, originalId, error, other));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < 17)
{
return((DnsResourceData)null);
}
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length - 16, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
offsetInDns += numBytesRead;
length -= numBytesRead;
if (length < 16)
{
return((DnsResourceData)null);
}
uint num1 = dns.ReadUInt(offsetInDns, Endianity.Big);
uint num2 = dns.ReadUInt(offsetInDns + 4, Endianity.Big);
DnsTransactionKeyMode mode = (DnsTransactionKeyMode)dns.ReadUShort(offsetInDns + 8, Endianity.Big);
DnsResponseCode error = (DnsResponseCode)dns.ReadUShort(offsetInDns + 10, Endianity.Big);
int length1 = (int)dns.ReadUShort(offsetInDns + 12, Endianity.Big);
if (length < 16 + length1)
{
return((DnsResourceData)null);
}
DataSegment key = dns.Subsegment(offsetInDns + 14, length1);
int num3 = 14 + length1;
offsetInDns += num3;
length -= num3;
int length2 = (int)dns.ReadUShort(offsetInDns, Endianity.Big);
if (length != 2 + length2)
{
return((DnsResourceData)null);
}
DataSegment other = dns.Subsegment(offsetInDns + 2, length2);
return((DnsResourceData) new DnsResourceDataTransactionKey(domainName, (SerialNumber32)num1, (SerialNumber32)num2, mode, error, key, other));
}
internal static bool TryRead(out ushort value, out DnsDomainName domainName, DnsDatagram dns, int offsetInDns, int length)
{
if (length < 2)
{
value = (ushort)0;
domainName = (DnsDomainName)null;
return(false);
}
value = dns.ReadUShort(offsetInDns, Endianity.Big);
length -= 2;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns + 2, length, out domainName, out numBytesRead))
{
return(false);
}
length -= numBytesRead;
return(length == 0);
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
offsetInDns += numBytesRead;
length -= numBytesRead;
DnsTypeBitmaps instance = DnsTypeBitmaps.CreateInstance(dns.Buffer, dns.StartOffset + offsetInDns, length);
if (instance == null)
{
return((DnsResourceData)null);
}
return((DnsResourceData) new DnsResourceDataNextDomainSecure(domainName, instance));
}
internal static List <DnsDomainName> ReadDomainNames(DnsDatagram dns, int offsetInDns, int length, int numExpected = 0)
{
List <DnsDomainName> domainNames = new List <DnsDomainName>(numExpected);
while (length != 0)
{
DnsDomainName domainName;
int domainNameLength;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out domainNameLength))
{
return(null);
}
offsetInDns += domainNameLength;
length -= domainNameLength;
domainNames.Add(domainName);
}
return(domainNames);
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < 3)
{
return((DnsResourceData)null);
}
byte precedence = dns[offsetInDns];
DnsGatewayType gatewayType = (DnsGatewayType)dns[offsetInDns + 1];
DnsPublicKeyAlgorithm algorithm = (DnsPublicKeyAlgorithm)dns[offsetInDns + 2];
DnsGateway instance = DnsGateway.CreateInstance(gatewayType, dns, offsetInDns + 3, length - 3);
if (instance == null)
{
return((DnsResourceData)null);
}
DataSegment publicKey = dns.Subsegment(offsetInDns + 3 + instance.Length, length - 3 - instance.Length);
return((DnsResourceData) new DnsResourceDataIpSecKey(precedence, instance, algorithm, publicKey));
}
internal static bool TryParseBase(DnsDatagram dns, int offsetInDns,
out DnsDomainName domainName, out DnsType type, out DnsClass dnsClass, out int numBytesRead)
{
type = DnsType.Any;
dnsClass = DnsClass.Any;
if (!DnsDomainName.TryParse(dns, offsetInDns, dns.Length - offsetInDns, out domainName, out numBytesRead))
{
return(false);
}
if (offsetInDns + numBytesRead + MinimumLengthAfterDomainName > dns.Length)
{
return(false);
}
type = (DnsType)dns.ReadUShort(offsetInDns + numBytesRead + OffsetAfterDomainName.Type, Endianity.Big);
dnsClass = (DnsClass)dns.ReadUShort(offsetInDns + numBytesRead + OffsetAfterDomainName.DnsClass, Endianity.Big);
numBytesRead += MinimumLengthAfterDomainName;
return(true);
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < ConstPartLength)
{
return(null);
}
byte precedence = dns[offsetInDns + Offset.Precedence];
DnsGatewayType gatewayType = (DnsGatewayType)dns[offsetInDns + Offset.GatewayType];
DnsPublicKeyAlgorithm algorithm = (DnsPublicKeyAlgorithm)dns[offsetInDns + Offset.Algorithm];
DnsGateway gateway = DnsGateway.CreateInstance(gatewayType, dns, offsetInDns + Offset.Gateway, length - ConstPartLength);
if (gateway == null)
{
return(null);
}
DataSegment publicKey = dns.Subsegment(offsetInDns + ConstPartLength + gateway.Length, length - ConstPartLength - gateway.Length);
return(new DnsResourceDataIpSecKey(precedence, gateway, algorithm, publicKey));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < 2)
{
return((DnsResourceData)null);
}
byte prefixLength = dns[offsetInDns];
if ((int)prefixLength > 128)
{
return((DnsResourceData)null);
}
++offsetInDns;
--length;
int length1 = DnsResourceDataA6.CalculateAddressSuffixLength(prefixLength);
if (length < length1)
{
return((DnsResourceData)null);
}
IpV6Address addressSuffix = new IpV6Address((UInt128)dns.ReadUnsignedBigInteger(offsetInDns, length1, Endianity.Big));
offsetInDns += length1;
length -= length1;
if (DnsResourceDataA6.IsAddressSuffixTooSmall(prefixLength, addressSuffix) || DnsResourceDataA6.IsAddressSuffixTooBig(prefixLength, addressSuffix))
{
return((DnsResourceData)null);
}
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
if (numBytesRead != length)
{
return((DnsResourceData)null);
}
return((DnsResourceData) new DnsResourceDataA6(prefixLength, addressSuffix, domainName));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < 8)
{
return((DnsResourceData)null);
}
ushort order = dns.ReadUShort(offsetInDns, Endianity.Big);
ushort preference = dns.ReadUShort(offsetInDns + 2, Endianity.Big);
DataSegment data = dns.Subsegment(offsetInDns + 4, length - 4);
int offset = 0;
DataSegment flags = DnsResourceData.ReadString(data, ref offset);
if (flags == null || !DnsResourceDataNamingAuthorityPointer.IsLegalFlags(flags))
{
return((DnsResourceData)null);
}
DataSegment services = DnsResourceData.ReadString(data, ref offset);
if (services == null)
{
return((DnsResourceData)null);
}
DataSegment regularExpression = DnsResourceData.ReadString(data, ref offset);
if (regularExpression == null)
{
return((DnsResourceData)null);
}
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns + 4 + offset, length - 4 - offset, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
if (4 + offset + numBytesRead != length)
{
return((DnsResourceData)null);
}
return((DnsResourceData) new DnsResourceDataNamingAuthorityPointer(order, preference, flags, services, regularExpression, domainName));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
DnsDomainName nextDomainName;
int nextDomainNameLength;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out nextDomainName, out nextDomainNameLength))
{
return(null);
}
offsetInDns += nextDomainNameLength;
length -= nextDomainNameLength;
DnsTypeBitmaps typeBitmaps = DnsTypeBitmaps.CreateInstance(dns.Buffer, dns.StartOffset + offsetInDns, length);
if (typeBitmaps == null)
{
return(null);
}
return(new DnsResourceDataNextDomainSecure(nextDomainName, typeBitmaps));
}
private static bool TryReadLabels(DnsDatagram dns, int offsetInDns, out int numBytesRead, List <DataSegment> labels)
{
numBytesRead = 0;
while (offsetInDns < dns.Length)
{
byte num = dns[offsetInDns];
++numBytesRead;
if ((int)num > 63)
{
if (offsetInDns + 1 >= dns.Length)
{
return(false);
}
int offsetInDns1 = (int)dns.ReadUShort(offsetInDns, Endianity.Big) & 16383;
if (offsetInDns1 >= offsetInDns)
{
return(false);
}
++numBytesRead;
int numBytesRead1;
return(DnsDomainName.TryReadLabels(dns, offsetInDns1, out numBytesRead1, labels));
}
if ((int)num != 0)
{
++offsetInDns;
if (offsetInDns + (int)num >= dns.Length)
{
return(false);
}
labels.Add(dns.Subsegment(offsetInDns, (int)num));
numBytesRead += (int)num;
offsetInDns += (int)num;
}
if ((int)num == 0)
{
return(true);
}
}
return(false);
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < 6)
{
return((DnsResourceData)null);
}
ushort priority = dns.ReadUShort(offsetInDns, Endianity.Big);
ushort weight = dns.ReadUShort(offsetInDns + 2, Endianity.Big);
ushort port = dns.ReadUShort(offsetInDns + 4, Endianity.Big);
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns + 6, length - 6, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
if (6 + numBytesRead != length)
{
return((DnsResourceData)null);
}
return((DnsResourceData) new DnsResourceDataServerSelection(priority, weight, port, domainName));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < ConstantPartLength)
{
return(null);
}
int hostIdentityTagLength = dns[offsetInDns + Offset.HostIdentityTagLength];
DnsPublicKeyAlgorithm publicKeyAlgorithm = (DnsPublicKeyAlgorithm)dns[offsetInDns + Offset.PublicKeyAlgorithm];
int publicKeyLength = dns.ReadUShort(offsetInDns + Offset.PublicKeyLength, Endianity.Big);
if (length < ConstantPartLength + hostIdentityTagLength + publicKeyLength)
{
return(null);
}
DataSegment hostIdentityTag = dns.Subsegment(offsetInDns + Offset.HostIdentityTag, hostIdentityTagLength);
int publicKeyOffset = offsetInDns + ConstantPartLength + hostIdentityTagLength;
DataSegment publicKey = dns.Subsegment(publicKeyOffset, publicKeyLength);
offsetInDns += ConstantPartLength + hostIdentityTagLength + publicKeyLength;
length -= ConstantPartLength + hostIdentityTagLength + publicKeyLength;
List <DnsDomainName> rendezvousServers = new List <DnsDomainName>();
while (length != 0)
{
DnsDomainName rendezvousServer;
int rendezvousServerLength;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out rendezvousServer, out rendezvousServerLength))
{
return(null);
}
rendezvousServers.Add(rendezvousServer);
offsetInDns += rendezvousServerLength;
length -= rendezvousServerLength;
}
return(new DnsResourceDataHostIdentityProtocol(hostIdentityTag, publicKeyAlgorithm, publicKey, rendezvousServers));
}
internal static DnsDataResourceRecord Parse(DnsDatagram dns, int offsetInDns, out int numBytesRead)
{
DnsDomainName domainName;
DnsType type;
DnsClass dnsClass;
if (!TryParseBase(dns, offsetInDns, out domainName, out type, out dnsClass, out numBytesRead))
{
return(null);
}
if (offsetInDns + numBytesRead + MinimumLengthAfterBase > dns.Length)
{
return(null);
}
int ttl = dns.ReadInt(offsetInDns + numBytesRead + OffsetAfterBase.Ttl, Endianity.Big);
ushort dataLength = dns.ReadUShort(offsetInDns + numBytesRead + OffsetAfterBase.DataLength, Endianity.Big);
numBytesRead += MinimumLengthAfterBase;
if (offsetInDns + numBytesRead + dataLength > dns.Length)
{
return(null);
}
DnsResourceData data = DnsResourceData.Read(dns, type, offsetInDns + numBytesRead, dataLength);
if (data == null)
{
return(null);
}
numBytesRead += dataLength;
if (type == DnsType.Opt)
{
return(new DnsOptResourceRecord(domainName, dnsClass, ttl, data));
}
return(new DnsDataResourceRecord(domainName, type, dnsClass, ttl, data));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < ConstantPartLength)
{
return(null);
}
ushort preference = dns.ReadUShort(offsetInDns + Offset.Preference, Endianity.Big);
offsetInDns += ConstantPartLength;
length -= ConstantPartLength;
DnsDomainName map822;
int map822Length;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out map822, out map822Length))
{
return(null);
}
offsetInDns += map822Length;
length -= map822Length;
DnsDomainName mapX400;
int mapX400Length;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out mapX400, out mapX400Length))
{
return(null);
}
length -= mapX400Length;
if (length != 0)
{
return(null);
}
return(new DnsResourceDataX400Pointer(preference, map822, mapX400));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
offsetInDns += numBytesRead;
length -= numBytesRead;
if (length > 16)
{
return((DnsResourceData)null);
}
DataSegment typeBitmap = dns.Subsegment(offsetInDns, length);
if (length != 0 && (int)typeBitmap.Last == 0)
{
return((DnsResourceData)null);
}
return((DnsResourceData) new DnsResourceDataNextDomain(domainName, typeBitmap));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < 4)
{
return((DnsResourceData)null);
}
int length1 = (int)dns[offsetInDns];
DnsPublicKeyAlgorithm publicKeyAlgorithm = (DnsPublicKeyAlgorithm)dns[offsetInDns + 1];
int length2 = (int)dns.ReadUShort(offsetInDns + 2, Endianity.Big);
if (length < 4 + length1 + length2)
{
return((DnsResourceData)null);
}
DataSegment hostIdentityTag = dns.Subsegment(offsetInDns + 4, length1);
int offset = offsetInDns + 4 + length1;
DataSegment publicKey = dns.Subsegment(offset, length2);
offsetInDns += 4 + length1 + length2;
length -= 4 + length1 + length2;
List <DnsDomainName> list = new List <DnsDomainName>();
while (length != 0)
{
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
list.Add(domainName);
offsetInDns += numBytesRead;
length -= numBytesRead;
}
return((DnsResourceData) new DnsResourceDataHostIdentityProtocol(hostIdentityTag, publicKeyAlgorithm, publicKey, (IEnumerable <DnsDomainName>)list));
}
internal override sealed DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
return(this.CreateInstance(dns.Subsegment(offsetInDns, length)));
}
internal static bool TryRead(out DnsDomainName first, out DnsDomainName second, DnsDatagram dns, int offsetInDns, int length)
{
List <DnsDomainName> list = DnsResourceDataDomainNames.ReadDomainNames(dns, offsetInDns, length, 2);
if (list == null || list.Count != 2)
{
first = (DnsDomainName)null;
second = (DnsDomainName)null;
return(false);
}
first = list[0];
second = list[1];
return(true);
}
protected override void Write(byte[] buffer, int offset)
{
DnsDatagram.Write(buffer, offset, this.Id, this.IsResponse, this.OpCode, this.IsAuthoritativeAnswer, this.IsTruncated, this.IsRecursionDesired, this.IsRecursionAvailable, this.FutureUse, this.IsAuthenticData, this.IsCheckingDisabled, this.ResponseCode, this.Queries, this.Answers, this.Authorities, this.Additionals, this.DomainNameCompressionMode);
}
internal abstract DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length);
