/// <summary>
/// Button "check DNS" in domain configuration have been click
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btDomainCheckDNS_Click(object sender, EventArgs e)
{
string sFullDomain = txtDomainSelector.Text + "._domainkey." + txtDomainName.Text;
lblDomainDNSCheckResult.Visible = false;
try
{
Resolver oResolver = new Resolver();
oResolver.Recursion = true;
oResolver.UseCache = false;
// Get the name server for the domain to avoid DNS caching
Response oResponse = oResolver.Query(sFullDomain, QType.NS, QClass.IN);
if (oResponse.RecordsRR.GetLength(0) > 0)
{
RR oNsRecord = oResponse.RecordsRR[0];
if (oNsRecord.RECORD.RR.RECORD.GetType() == typeof(RecordSOA))
{
RecordSOA oSoaRecord = (RecordSOA)oNsRecord.RECORD.RR.RECORD;
oResolver.DnsServer = oSoaRecord.MNAME;
}
}
// Get the TXT record for DKIM
oResponse = oResolver.Query(sFullDomain, QType.TXT, QClass.IN);
if (oResponse.RecordsTXT.GetLength(0) > 0)
{
RecordTXT oTxtRecord = oResponse.RecordsTXT[0];
txtDomainDNS.Text = oTxtRecord.TXT.Count > 0 ? string.Join(string.Empty, oTxtRecord.TXT) : "No record found for " + sFullDomain;
if (oTxtRecord.TXT.Count > 0)
{
//check if public key matches suggested
var matchesDns = Regex.Matches(txtDomainDNS.Text, @";\s*p=([^\s]+)");
var matchesSuggested = Regex.Matches(txtDNSRecord.Text, @";\s*p=([^\s]+)");
if (matchesDns.Count == 0 || matchesDns[0].Groups.Count <= 1)
{
lblDomainDNSCheckResult.Text = "Could not extract public key from DNS record.";
lblDomainDNSCheckResult.ForeColor = Color.Firebrick;
}
else if (matchesSuggested.Count == 0 || matchesSuggested[0].Groups.Count <= 1)
{
lblDomainDNSCheckResult.Text = "Could not extract public key from suggested DNS record.";
lblDomainDNSCheckResult.ForeColor = Color.Firebrick;
}
else if (String.Compare(matchesDns[0].Groups[1].ToString(), matchesSuggested[0].Groups[1].ToString(), StringComparison.Ordinal) == 0)
{
lblDomainDNSCheckResult.Text = "DNS record public key is correct";
lblDomainDNSCheckResult.ForeColor = Color.Green;
}
else
{
lblDomainDNSCheckResult.Text = "DNS record public key does not match";
lblDomainDNSCheckResult.ForeColor = Color.Firebrick;
}
lblDomainDNSCheckResult.Visible = true;
}
}
else
{
txtDomainDNS.Text = "No record found for " + sFullDomain;
}
}
catch (Exception ex)
{
ShowMessageBox("Error", "Coldn't get DNS record:\n" + ex.Message, MessageBoxButtons.OK, MessageBoxIcon.Error);
txtDomainDNS.Text = "Error getting record.";
}
}
private RecordInfo CreateRecordInfo(RecordTXT recordTxt, string orgDomain, bool isTld, bool isInherited)
{
var record = string.Join(string.Empty, recordTxt.TXT);
return(new DmarcRecordInfo(record.EscapeNonAsciiChars(), orgDomain, isTld, isInherited));
}
private RecordInfo CreateRecordInfo(RecordTXT recordTxt)
{
var record = string.Join(string.Empty, recordTxt.TXT);
return(new SpfRecordInfo(record.EscapeNonAsciiChars()));
}