private async Task <bool> HasSoaRecordAsync(DomainName domainName)
{
// Check if there's an SOA record (start of authority)
var response = await dns.QueryAsync(NameServer.Google, domainName.Name, DnsRecordType.SOA);
return(response.Answers.Length > 0);
}
private async Task <IReadOnlyList <DomainRecord> > SyncSet <T>(IDomain domain, DnsRecordType type)
{
var response = await dns.QueryAsync(NameServer.Google, domain.Name, type);
var added = new List <DomainRecord>();
foreach (var record in response.Answers)
{
if (record.Data is T recordData)
{
var newRecord = await CreateAsync(
new CreateDomainRecordRequest(
domainId : domain.Id,
name : "@",
type : record.Type,
value : recordData.ToString(),
ttl : TimeSpan.FromSeconds(record.Ttl)
)
);
added.Add(newRecord);
}
}
return(added);
}
/// <summary>
/// Query TXT records for specified domain names
/// </summary>
/// <param name="domain"></param>
/// <returns></returns>
public async Task <List <string> > QueryTxtRecord(string domain)
{
var dns = new DnsClient()
{
Servers = new[] { IPAddress.Parse("8.8.8.8"), IPAddress.Parse("114.114.114.114") }
};
try
{
var response = await dns.QueryAsync(domain, DnsType.TXT);
var strings = response.Answers
.OfType <TXTRecord>()
.SelectMany(txt => txt.Strings);
return(strings.ToList());
}
catch (Exception e)
{
_logger.LogError(e, "Dns resolve error.");
}
return(new List <string>());
}