/// <summary>
/// Queries asn.cymru.com for a TXT record
/// {Reverse-IPaddress}.origin.asn.cymru.com
/// </summary>
/// <param name="ipAddress"></param>
/// <returns></returns>
//internal string GetASN(string ipAddress)
//{
// string asnResult = string.Empty;
// try
// {
// Response resp = _resolver.Query(string.Join(".", ipAddress.Split('.').Reverse()) + ".origin.asn.cymru.com", QType.TXT, QClass.IN);
// if (resp.Answers.Count > 0)
// {
// RecordTXT txtRecord = resp.Answers[0].RECORD as RecordTXT;
// if (!Object.Equals(txtRecord, null))
// asnResult = txtRecord.ASN;
// }
// }
// catch (Exception e)
// {
// ExceptionExtensions.LogError(e, "Dig.GetASN", "IPAddress: " + ipAddress);
// }
// return asnResult;
//}
internal string GetASN(string ipAddress)
{
string asnResult = string.Empty;
try
{
DnsQuery _dnsQuery = new DnsQuery(_dnsServers, string.Join(".", ipAddress.Split('.').Reverse()) + ".origin.asn.cymru.com");
if (Object.Equals(null, _dnsQuery))
{
ExceptionExtensions.LogError(new ArgumentNullException("dnsQuery is NULL"), "Dig.GetASN", "dns servers count: " + _dnsServers.Count);
return(null);
}
DnsAnswer resp = _dnsQuery.QueryServers(RecordType.TXT);
if (!Object.Equals(null, resp) && resp.Answers.Count > 0)
{
TxtRecord txtRecord = resp.Answers[0].Data as TxtRecord;
if (!Object.Equals(txtRecord, null))
{
asnResult = txtRecord.ASN;
}
}
}
catch (Exception e)
{
ExceptionExtensions.LogError(e, "Dig.GetASN", "IPAddress: " + ipAddress);
}
return(asnResult);
}
internal ARecord GetARecord(string domainName)
{
try
{
DnsQuery _dnsQuery = new DnsQuery(_dnsServers, domainName);
if (Object.Equals(null, _dnsQuery))
{
ExceptionExtensions.LogError(new ArgumentNullException("dnsQuery is NULL"), "Dig.GetARecord", "dns servers count: " + _dnsServers.Count);
return(null);
}
DnsAnswer answer = _dnsQuery.QueryServers(RecordType.A);
if (!Object.Equals(answer, null) && answer.Answers.Count > 0)
{
foreach (Answer item in answer.Answers)
{
if (!Object.Equals(null, item) && item.RecType == RecordType.A && !Object.Equals(null, item.Data))
{
return(item.Data as ARecord);
}
}
return(null);
}
}
catch (Exception e)
{
ExceptionExtensions.LogError(e, "Dig.GetARecord", "Domain: " + domainName);
}
return(null);
}
/// <summary>
/// Queries for NS records. These records are used in the lookup table for DNS HOST
/// </summary>
/// <param name="domainName"></param>
/// <returns>List of RecordDNS</returns>
//internal List<RecordNS> GetNSRecords(string domainName)
//{
// List<RecordNS> records = new List<RecordNS>();
// try
// {
// Response resp = _resolver.Query(domainName, QType.NS, QClass.IN);
// if (resp.Answers.Count > 0)
// records = resp.Answers.Select(rec => rec.RECORD as RecordNS).ToList();
// }
// catch (Exception e)
// {
// ExceptionExtensions.LogError(e, "Dig.GetNSRecords", "Domain: " + domainName);
// }
// return records;
//}
internal List <NSRecord> GetNSRecords(string domainName)
{
List <NSRecord> records = new List <NSRecord>();
try
{
DnsQuery _dnsQuery = new DnsQuery(_dnsServers, domainName);
DnsAnswer resp = _dnsQuery.QueryServers(RecordType.NS);
if (!Object.Equals(null, resp) && resp.Answers.Count > 0)
{
records = resp.Answers.Select(rec => rec.Data as NSRecord).ToList();
}
}
catch (Exception e)
{
ExceptionExtensions.LogError(e, "Dig.GetNSRecords", "Domain: " + domainName);
}
return(records);
}
/// <summary>
/// Uses {IP}origin.asn.cymru.com to get ASN and then additional information
/// from {AS#}asn.cymru.com to get company name
/// </summary>
/// <param name="p"></param>
/// <returns>Company name from AS records</returns>
public string GetWebHostName(string domainName)
{
string companyName = "None";
string asn = string.Empty;
try
{
IPAddress ip = GetIPAddress(domainName);
if (!Object.Equals(ip, null))
{
asn = GetASN(ip.ToString());
if (asn.Contains(" "))
{
asn = asn.Split(' ')[0];
}
DnsQuery _dnsQuery = new DnsQuery(_dnsServers, string.Format("AS{0}.asn.cymru.com", asn));
DnsAnswer resp = _dnsQuery.QueryServers(RecordType.TXT);
if (!Object.Equals(resp, null) && resp.Answers.Count > 0 && !Object.Equals(resp.Answers[0], null))
{
TxtRecord txtRecord = resp.Answers[0].Data as TxtRecord;
if (!Object.Equals(txtRecord, null))
{
companyName = txtRecord.COMPANY;
}
}
}
}
catch (Exception e)
{
ExceptionExtensions.LogError(e, "Dig.GetWebHostName", "Domain: " + domainName);
}
return(GetCompanyFromRecordName(companyName, domainName, DigTypeEnum.WEB));
}
