public static bool UpdateSpf(this ServerDns dns, string domain)
{
var utcNow = DateTime.UtcNow;
var dnsLookup = new DnsLookup();
if (dns.SpfDateChecked.HasValue && dns.SpfDateChecked.Value.AddSeconds(dns.SpfTtl) >= utcNow)
{
return(false);
}
var txtRecords = dnsLookup
.GetDomainTxtRecords(domain);
var spfRecord = txtRecords.FirstOrDefault(
txt => txt.TextData.Trim('\"')
.Equals(dns.Spf, StringComparison.InvariantCultureIgnoreCase));
dns.SpfVerified = spfRecord != null;
dns.SpfTtl = spfRecord != null ? spfRecord.TimeToLive : Defines.ServerDnsDefaultTtl;
dns.SpfDateChecked = utcNow;
return(true);
}
public static bool UpdateDkim(this ServerDns dns, string domain)
{
var utcNow = DateTime.UtcNow;
var dnsLookup = new DnsLookup();
if (dns.DkimDateChecked.HasValue && dns.DkimDateChecked.Value.AddSeconds(dns.DkimTtl) >= utcNow)
{
return(false);
}
var dkimRecordName = string.Format("{0}._domainkey.{1}", dns.DkimSelector, domain);
var dkimRecord = dnsLookup
.GetDomainTxtRecords(dkimRecordName).FirstOrDefault(
txt => txt.TextData.Trim('\"')
.Equals(dns.DkimPublicKey, StringComparison.InvariantCultureIgnoreCase));
dns.DkimVerified = dkimRecord != null;
dns.DkimTtl = dkimRecord != null ? dkimRecord.TimeToLive : Defines.ServerDnsDefaultTtl;
dns.DkimDateChecked = utcNow;
return(true);
}