internal static ResourceRecord ReadFrom(PacketReader reader)
{
string name = reader.ReadName();
RecordType type = (RecordType)reader.ReadUShort();
RecordClass rClass = (RecordClass)reader.ReadUShort();
DateTime expiry = DateTime.UtcNow + TimeSpan.FromSeconds(reader.ReadInt());
switch (type)
{
case RecordType.Pointer:
return(new PointerRecord(name, type, rClass, expiry, reader));
case RecordType.CanonicalName:
return(new CanonicalNameRecord(name, type, rClass, expiry, reader));
case RecordType.Address:
return(new IP4AddressRecord(name, type, rClass, expiry, reader));
case RecordType.Text:
return(new TextRecord(name, type, rClass, expiry, reader));
case RecordType.Service:
return(new ServiceRecord(name, type, rClass, expiry, reader));
default:
int len = reader.ReadUShort();
reader.Position += len;
return(new ResourceRecord(name, type, rClass, expiry));
}
}
internal static ResourceRecord ReadFrom(PacketReader reader)
{
string name = reader.ReadName();
RecordType type = (RecordType)reader.ReadUShort();
RecordClass rClass = (RecordClass)reader.ReadUShort();
DateTime expiry = DateTime.UtcNow + TimeSpan.FromSeconds(reader.ReadInt());
switch (type)
{
case RecordType.Pointer:
return new PointerRecord(name, type, rClass, expiry, reader);
case RecordType.CanonicalName:
return new CanonicalNameRecord(name, type, rClass, expiry, reader);
case RecordType.Address:
return new IP4AddressRecord(name, type, rClass, expiry, reader);
case RecordType.Text:
return new TextRecord(name, type, rClass, expiry, reader);
case RecordType.Service:
return new ServiceRecord(name, type, rClass, expiry, reader);
default:
int len = reader.ReadUShort();
reader.Position += len;
return new ResourceRecord(name, type, rClass, expiry);
}
}
internal ServiceRecord(string name, RecordType type, RecordClass rClass, DateTime expiry, PacketReader reader)
: base(name, type, rClass, expiry)
{
ushort dataLen = reader.ReadUShort();
int pos = reader.Position;
_priority = reader.ReadUShort();
_weight = reader.ReadUShort();
_port = reader.ReadUShort();
_target = reader.ReadName();
reader.Position = pos + dataLen;
}
internal ServiceRecord(string name, RecordType type, RecordClass rClass, DateTime expiry, PacketReader reader)
: base(name, type, rClass, expiry)
{
ushort dataLen = reader.ReadUShort();
int pos = reader.Position;
_priority = reader.ReadUShort();
_weight = reader.ReadUShort();
_port = reader.ReadUShort();
_target = reader.ReadName();
reader.Position = pos + dataLen;
}
internal IP4AddressRecord(string name, RecordType type, RecordClass rClass, DateTime expiry, PacketReader reader)
: base(name, type, rClass, expiry)
{
ushort dataLen = reader.ReadUShort();
int pos = reader.Position;
_address = new IPAddress(reader.ReadBytes(dataLen));
reader.Position = pos + dataLen;
}
internal CanonicalNameRecord(string name, RecordType type, RecordClass rClass, DateTime expiry, PacketReader reader)
: base(name, type, rClass, expiry)
{
ushort dataLen = reader.ReadUShort();
int pos = reader.Position;
_canonicalName = reader.ReadName();
reader.Position = pos + dataLen;
}
internal PointerRecord(string name, RecordType type, RecordClass rClass, DateTime expiry, PacketReader reader)
: base(name, type, rClass, expiry)
{
ushort dataLen = reader.ReadUShort();
int pos = reader.Position;
_targetName = reader.ReadName();
reader.Position = pos + dataLen;
}
internal IP4AddressRecord(string name, RecordType type, RecordClass rClass, DateTime expiry, PacketReader reader)
: base(name, type, rClass, expiry)
{
ushort dataLen = reader.ReadUShort();
int pos = reader.Position;
_address = new IPAddress(reader.ReadBytes(dataLen));
reader.Position = pos + dataLen;
}
public static Message Read(PacketReader reader)
{
Message result = new Message();
result.TransactionId = reader.ReadUShort();
result.Flags = new MessageFlags(reader.ReadUShort());
ushort questions = reader.ReadUShort();
ushort answers = reader.ReadUShort();
ushort authorityRecords = reader.ReadUShort();
ushort additionalRecords = reader.ReadUShort();
for (int i = 0; i < questions; ++i)
{
result.Questions.Add(Question.ReadFrom(reader));
}
for (int i = 0; i < answers; ++i)
{
result.Answers.Add(ResourceRecord.ReadFrom(reader));
}
for (int i = 0; i < authorityRecords; ++i)
{
result.AuthorityRecords.Add(ResourceRecord.ReadFrom(reader));
}
for (int i = 0; i < additionalRecords; ++i)
{
result.AdditionalRecords.Add(ResourceRecord.ReadFrom(reader));
}
return(result);
}
public static Message Read(PacketReader reader)
{
Message result = new Message();
result.TransactionId = reader.ReadUShort();
result.Flags = new MessageFlags(reader.ReadUShort());
ushort questions = reader.ReadUShort();
ushort answers = reader.ReadUShort();
ushort authorityRecords = reader.ReadUShort();
ushort additionalRecords = reader.ReadUShort();
for (int i = 0; i < questions; ++i)
{
result.Questions.Add(Question.ReadFrom(reader));
}
for (int i = 0; i < answers; ++i)
{
result.Answers.Add(ResourceRecord.ReadFrom(reader));
}
for (int i = 0; i < authorityRecords; ++i)
{
result.AuthorityRecords.Add(ResourceRecord.ReadFrom(reader));
}
for (int i = 0; i < additionalRecords; ++i)
{
result.AdditionalRecords.Add(ResourceRecord.ReadFrom(reader));
}
return result;
}
internal TextRecord(string name, RecordType type, RecordClass rClass, DateTime expiry, PacketReader reader)
: base(name, type, rClass, expiry)
{
_values = new Dictionary<string, byte[]>();
ushort dataLen = reader.ReadUShort();
int pos = reader.Position;
while (reader.Position < pos + dataLen)
{
int valueLen = reader.ReadByte();
byte[] valueBinary = reader.ReadBytes(valueLen);
StoreValue(valueBinary);
}
}
internal TextRecord(string name, RecordType type, RecordClass rClass, DateTime expiry, PacketReader reader)
: base(name, type, rClass, expiry)
{
_values = new Dictionary <string, byte[]>();
ushort dataLen = reader.ReadUShort();
int pos = reader.Position;
while (reader.Position < pos + dataLen)
{
int valueLen = reader.ReadByte();
byte[] valueBinary = reader.ReadBytes(valueLen);
StoreValue(valueBinary);
}
}