/// <summary>
/// Constructs an SOA record by reading bytes from a return message
/// </summary>
/// <param name="pointer">A logical pointer to the bytes holding the record</param>
public Soa(Pointer pointer)
{
// read all fields RFC1035 3.3.13
primaryNameServer = pointer.ReadDomain();
responsibleMailAddress = pointer.ReadDomain();
serial = pointer.ReadInt();
refresh = pointer.ReadInt();
retry = pointer.ReadInt();
expire = pointer.ReadInt();
defaultTtl = pointer.ReadInt();
}
/// <summary>
/// Construct a resource record from a pointer to a byte array
/// </summary>
/// <param name="pointer">the position in the byte array of the record</param>
internal ResourceRecord(Pointer pointer)
{
// extract the domain, question type, question class and Ttl
domain = pointer.ReadDomain();
dnsType = (DnsType)pointer.ReadShort();
dnsClass = (DnsClass)pointer.ReadShort();
ttl = pointer.ReadInt();
// the next short is the record length
length = pointer.ReadShort();
// and create the appropriate RDATA record based on the dnsType
switch (dnsType)
{
case DnsType.A: record = new A(pointer); break;
case DnsType.AAAA: record = new Aaaa(pointer); break;
case DnsType.Cname: record = new Cname(pointer); break;
case DnsType.HINFO: record = new HInfo(pointer); break;
case DnsType.LOC: record = new Loc(pointer); break;
case DnsType.MX: record = new MX(pointer); break;
case DnsType.NS: record = new NS(pointer); break;
case DnsType.PTR: record = new Ptr(pointer); break;
case DnsType.SOA: record = new Soa(pointer); break;
case DnsType.SRV: record = new Srv(pointer); break;
case DnsType.SSHFP: record = new SshFP(pointer); break;
case DnsType.TXT: record = new Txt(pointer, length); break;
case DnsType.NULL: record = new Null(pointer, length); break;
//mail related RR types
case DnsType.MB: record = new MB(pointer); break;
case DnsType.MD: record = new MD(pointer); break;
case DnsType.MF: record = new MF(pointer); break;
case DnsType.MG: record = new MG(pointer); break;
case DnsType.MINFO: record = new MInfo(pointer); break;
//RFC 1183 RR types
case DnsType.AFSDB: record = new Afsdb(pointer); break;
case DnsType.RP: record = new Rp(pointer); break;
default:
{
// move the pointer over this unrecognised record
pointer += length;
break;
}
}
}
/// <summary>
/// Constructs an LOC record by reading bytes from a return message
/// </summary>
/// <param name="pointer">A logical pointer to the bytes holding the record</param>
public Loc(Pointer pointer)
{
int referenceAlt = 100000 * 100;
int latval, longval, altval;
version = pointer.ReadByte();
size = pointer.ReadByte();
hPrecision = pointer.ReadByte();
vPrecision = pointer.ReadByte();
latitude = pointer.ReadInt();
longitude = pointer.ReadInt();
altitude = pointer.ReadInt();
latval = latitude - (1 << 31);
longval = longitude - (1 << 31);
if (altitude < referenceAlt)
{
//below WGS 84 spheroid
altval = referenceAlt - altitude;
altsign = -1;
}
else
{
altval = altitude - referenceAlt;
altsign = 1;
}
if (latval < 0)
{
northsouth = 'S';
latval = -latval;
}
else
northsouth = 'N';
//latitude calculation
latsecfrag = latval % 1000;
latval /= 1000;
latsec = latval % 60;
latval /= 60;
latmin = latval % 60;
latval /= 60;
latdeg = latval;
if (longval < 0)
{
eastwest = 'W';
longval = -longval;
}
else
eastwest = 'E';
//longitude calculation
longsecfrag = longval % 1000;
longval /= 1000;
longsec = longval % 60;
longval /= 60;
longmin = longval % 60;
longval /= 60;
longdeg = longval;
//altitude
altfrag = altval % 100;
altmeters = (altval / 100) * altsign;
}