public ResourceRecord(DnsReader br)
{
_domain = br.ReadDomain();
_qtype = (RecordType)br.ReadInt16();
_qclass = (RecordClass)br.ReadInt16();
_ttl = br.ReadInt32();
int recordLength = br.ReadInt16();
if (recordLength != 0)
{
switch (_qtype)
{
case RecordType.A: _record = new ARecord(br); break;
case RecordType.CNAME: _record = new CNAMERecord(br); break;
case RecordType.MX: _record = new MXRecord(br); break;
case RecordType.NS: _record = new NSRecord(br); break;
case RecordType.SOA: _record = new SOARecord(br); break;
case RecordType.TXT: _record = new TXTRecord(br); break;
case RecordType.PTR: _record = new PTRERecord(br); break;
// NetBIOS related records
case RecordType.NB: _record = new NBRecord(br); break;
default:
br += recordLength;
break;
}
}
}
public ResourceRecord(DnsReader br)
{
_domain = br.ReadDomain();
_qtype = (RecordType)br.ReadInt16();
_qclass = (RecordClass)br.ReadInt16();
_ttl = br.ReadInt32();
int recordLength = br.ReadInt16();
if (recordLength != 0)
{
switch (_qtype)
{
case RecordType.A: _record = new ARecord(br); break;
case RecordType.CNAME: _record = new CNAMERecord(br); break;
case RecordType.MX: _record = new MXRecord(br); break;
case RecordType.NS: _record = new NSRecord(br); break;
case RecordType.SOA: _record = new SOARecord(br); break;
case RecordType.TXT: _record = new TXTRecord(br); break;
case RecordType.PTR: _record = new PTRERecord(br); break;
// NetBIOS related records
case RecordType.NB: _record = new NBRecord(br); break;
default:
br += recordLength;
break;
}
}
}
public DnsMessage(byte[] data)
{
Timestamp = DateTime.Now;
DnsReader byteReader = new DnsReader(data);
// Header
Header = new Header(byteReader);
// Question, Answer, Authority, Additional Counts
Questions = new Question[this.QuestionRecordCount];
Answers = new Answer[this.AnswerRecordCount];
Authorities = new Authority[this.AuthorityRecordCount];
Additionals = new Additional[this.AdditionalRecordCount];
// Read Records
for (int i = 0; i < this.QuestionRecordCount; i++)
{
this.Questions[i] = new Question(byteReader);
}
for (int i = 0; i < this.AnswerRecordCount; i++)
{
this.Answers[i] = new Answer(byteReader);
}
for (int i = 0; i < this.AuthorityRecordCount; i++)
{
this.Authorities[i] = new Authority(byteReader);
}
for (int i = 0; i < this.AdditionalRecordCount; i++)
{
this.Additionals[i] = new Additional(byteReader);
}
}
public SOARecord(DnsReader br)
{
_mname = br.ReadDomain();
_rname = br.ReadDomain();
_serial = br.ReadInt32();
_refresh = br.ReadInt32();
_retry = br.ReadInt32();
_expire = br.ReadInt32();
_minimumTtl = br.ReadInt32();
}
public SOARecord(DnsReader br)
{
_mname = br.ReadDomain();
_rname = br.ReadDomain();
_serial = br.ReadInt32();
_refresh = br.ReadInt32();
_retry = br.ReadInt32();
_expire = br.ReadInt32();
_minimumTtl = br.ReadInt32();
}
/// <summary>
/// Reads a domain name from the byte array. (RFC 1035 - 4.1.4.)
/// </summary>
public string ReadDomain()
{
StringBuilder domain = new StringBuilder();
int length = 0;
while ((length = ReadByte()) != 0)
{
// top 2 bits set denotes domain name compression and to reference elsewhere
if ((length & 0xc0) == 0xc0)
{
// work out the existing domain name, copy this pointer
DnsReader newPointer = Copy();
// and move it to where specified here
newPointer.Position = (length & 0x3f) << 8 | ReadByte();
// repeat call recursively
domain.Append(newPointer.ReadDomain());
return(domain.ToString());
}
// if not using compression, copy a char at a time to the domain name
while (length > 0)
{
domain.Append(ReadChar());
length--;
}
// if size of next label isn't null (end of domain name) add a period ready for next label
if (Peek() != 0)
{
domain.Append('.');
}
}
return(domain.ToString());
}
public PTRERecord(DnsReader br)
{
_domain = br.ReadDomain();
}
public CNAMERecord(DnsReader br)
{
_domain = br.ReadDomain();
}
public ARecord(DnsReader br)
{
_ipAddress = new IPAddress(br.ReadBytes(4));
}
public TXTRecord(DnsReader br)
{
_txtData = br.ReadString();
}
public NSRecord(DnsReader br)
{
_domainName = br.ReadDomain();
}
public ARecord(DnsReader br)
{
_ipAddress = new IPAddress(br.ReadBytes(4));
}
internal Question(DnsReader br)
{
_domain = br.ReadDomain();
_qtype = (RecordType)br.ReadInt16();
_qclass = (RecordClass)br.ReadInt16();
}
public NBRecord(DnsReader br)
{
_flags = br.ReadUInt16();
_ipAddress = new IPAddress(br.ReadBytes(4));
}
public NSRecord(DnsReader br)
{
_domainName = br.ReadDomain();
}
public DnsMessage(byte[] data)
{
Timestamp = DateTime.Now;
DnsReader byteReader = new DnsReader(data);
// Header
Header = new Header(byteReader);
// Question, Answer, Authority, Additional Counts
Questions = new Question[this.QuestionRecordCount];
Answers = new Answer[this.AnswerRecordCount];
Authorities = new Authority[this.AuthorityRecordCount];
Additionals = new Additional[this.AdditionalRecordCount];
// Read Records
for (int i = 0; i < this.QuestionRecordCount; i++)
this.Questions[i] = new Question(byteReader);
for (int i = 0; i < this.AnswerRecordCount; i++)
this.Answers[i] = new Answer(byteReader);
for (int i = 0; i < this.AuthorityRecordCount; i++)
this.Authorities[i] = new Authority(byteReader);
for (int i = 0; i < this.AdditionalRecordCount; i++)
this.Additionals[i] = new Additional(byteReader);
}
public Authority(DnsReader br)
: base(br)
{
}
public TXTRecord(DnsReader br)
{
_txtData = br.ReadString();
}
public Additional(DnsReader br)
: base(br)
{
}
internal Question(DnsReader br)
{
_domain = br.ReadDomain();
_qtype = (RecordType)br.ReadInt16();
_qclass = (RecordClass)br.ReadInt16();
}
public CNAMERecord(DnsReader br)
{
_domain = br.ReadDomain();
}
public Additional(DnsReader br) : base(br)
{
}
public Answer(DnsReader br) : base(br)
{
}
public NBRecord(DnsReader br)
{
_flags = br.ReadUInt16();
_ipAddress = new IPAddress(br.ReadBytes(4));
}
public PTRERecord(DnsReader br)
{
_domain = br.ReadDomain();
}
public Authority(DnsReader br) : base(br)
{
}
public Answer(DnsReader br)
: base(br)
{
}
public MXRecord(DnsReader br)
{
_preference = br.ReadInt16();
_domainName = br.ReadDomain();
}
