internal DnsServerResponse(bool connectionOk,int id,DNS_RCode rcode,List<DNS_rr> answers,List<DNS_rr> authoritiveAnswers,List<DNS_rr> additionalAnswers)
{
m_Success = connectionOk;
m_ID = id;
m_RCODE = rcode;
m_pAnswers = answers;
m_pAuthoritiveAnswers = authoritiveAnswers;
m_pAdditionalAnswers = additionalAnswers;
}
internal DnsServerResponse(bool connectionOk, int id, DNS_RCode rcode, List <DNS_rr> answers, List <DNS_rr> authoritiveAnswers, List <DNS_rr> additionalAnswers)
{
m_Success = connectionOk;
m_ID = id;
m_RCODE = rcode;
m_pAnswers = answers;
m_pAuthoritiveAnswers = authoritiveAnswers;
m_pAdditionalAnswers = additionalAnswers;
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="rcode">DNS server returned error code.</param>
public DNS_ClientException(DNS_RCode rcode)
: base("Dns error: " + rcode + ".")
{
m_RCode = rcode;
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="rcode">DNS server returned error code.</param>
public DNS_ClientException(DNS_RCode rcode) : base("Dns error: " + rcode + ".")
{
m_RCode = rcode;
}
/// <summary>
/// Parses query.
/// </summary>
/// <param name="reply">Dns server reply.</param>
/// <returns></returns>
private DnsServerResponse ParseQuery(byte[] reply)
{
//--- Parse headers ------------------------------------//
/* RFC 1035 4.1.1. Header section format
*
* 1 1 1 1 1 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ID |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|QR| Opcode |AA|TC|RD|RA| Z | RCODE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QDCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ANCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| NSCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ARCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
| QDCOUNT
| an unsigned 16 bit integer specifying the number of
| entries in the question section.
|
| ANCOUNT
| an unsigned 16 bit integer specifying the number of
| resource records in the answer section.
|
| NSCOUNT
| an unsigned 16 bit integer specifying the number of name
| server resource records in the authority records section.
|
| ARCOUNT
| an unsigned 16 bit integer specifying the number of
| resource records in the additional records section.
|
*/
// Get reply code
int id = (reply[0] << 8 | reply[1]);
OPCODE opcode = (OPCODE)((reply[2] >> 3) & 15);
DNS_RCode replyCode = (DNS_RCode)(reply[3] & 15);
int queryCount = (reply[4] << 8 | reply[5]);
int answerCount = (reply[6] << 8 | reply[7]);
int authoritiveAnswerCount = (reply[8] << 8 | reply[9]);
int additionalAnswerCount = (reply[10] << 8 | reply[11]);
//---- End of headers ---------------------------------//
int pos = 12;
//----- Parse question part ------------//
for (int q = 0; q < queryCount; q++)
{
string dummy = "";
GetQName(reply, ref pos, ref dummy);
//qtype + qclass
pos += 4;
}
//--------------------------------------//
// 1) parse answers
// 2) parse authoritive answers
// 3) parse additional answers
List <DNS_rr> answers = ParseAnswers(reply, answerCount, ref pos);
List <DNS_rr> authoritiveAnswers = ParseAnswers(reply, authoritiveAnswerCount, ref pos);
List <DNS_rr> additionalAnswers = ParseAnswers(reply, additionalAnswerCount, ref pos);
return(new DnsServerResponse(true, id, replyCode, answers, authoritiveAnswers, additionalAnswers));
}
