public bool CheckRecord(string domain)
{
var dnsResolver = new DnsStubResolver();
var mxRecords = dnsResolver.Resolve <MxRecord>(domain, RecordType.Mx);
var priority = mxRecords.ToArray().Min().Preference;
//check priority if there is any MXrecords
if (mxRecords.Count == 0)
{
return(false);
}
else
{
foreach (var record in mxRecords)
{
Console.WriteLine(record.Preference + " " + record.ExchangeDomainName?.ToString());
}
for (int i = 0; i < mxRecords.Count; i++)
{
if (mxRecords[i].Preference == priority)
{
provider = mxRecords[i].ExchangeDomainName?.ToString();
}
}
return(true);
}
}
public async Task <ParsedSPFRecord> GetSPF(string domainName, int lookupCount)
{
try
{
if (lookupCount <= 15)
{
string spfRecord = null;
IDnsResolver resolver = new DnsStubResolver();
List <TxtRecord> txtRecords = resolver.Resolve <TxtRecord>(domainName, RecordType.Txt);
foreach (TxtRecord ip in txtRecords)
{
if (ip.TextData.Contains("v=spf1 "))
{
spfRecord = ip.TextData;
}
}
if (spfRecord.IsNullOrWhiteSpace())
{
return(null);
}
return(await ParseSPFOutput(spfRecord.Split(' '), domainName, lookupCount));
}
return(null);
}
catch
{
return(null);
}
}
/// <summary>
/// Applies this configuration to the specified <paramref name="resolver"/>.
/// </summary>
/// <param name="resolver">The resolver to be configured.</param>
/// <exception cref="System.ArgumentNullException">
/// Thrown when <paramref name="resolver"/> is <see langword="null"/>.
/// </exception>
public override void Apply(IDnsResolver resolver)
{
DnsStubResolver stub = (DnsStubResolver)resolver;
base.Apply(resolver);
lock (stub.Servers) {
stub.Servers.Clear();
if (this.DiscoverServers)
{
this.Log.Info("discovering network servers");
foreach (IPEndPoint server in DiscoverNetworkServers())
{
stub.Servers.Add(server);
this.Log.InfoFormat("discovered server, ep={0}", server);
}
}
foreach (DnsEndPointElement element in this.Servers)
{
stub.Servers.Add(element.Endpoint);
}
if (stub.Servers.Count == 0)
{
this.Log.Error("no servers specified in configuration and dicovery of network servers " +
"failed to yield any servers or is disabled");
}
}
}
public DetectedProviderDTO DetectProviderFromEmailAddress(string emailAddress)
{
// validating the input parameter (mail address)
if (!MailValidator.IsValidEmail(emailAddress))
{
throw new ApplicationException("Invalid e-mail format");
}
DetectedProviderDTO detectedProvider = new DetectedProviderDTO();
detectedProvider.EmailAddress = emailAddress;
//get the name of the host from the email address
var address = emailAddress.Split("@")[1];
// with DnsResolver we search from the Mx records to see what mail exchange server is responsible
var resolver = new DnsStubResolver();
var records = resolver.Resolve <MxRecord>(address, RecordType.Mx);
List <string> exchangeDomainServersResult = new List <string>();
foreach (var record in records)
{
exchangeDomainServersResult.Add(record.ExchangeDomainName?.ToString());
}
var providerName = ProvidersInfo.GetProviderNameByExchangeName(exchangeDomainServersResult);
detectedProvider.ProviderName = providerName;
return(detectedProvider);
}
/// <summary>
/// Pulls the IP address(es) in use by the Azure App Service. This is used to check that A records are configured properly towards the App Service.
/// If the App Service is in an ASE, the name is setup as follows: {App Service name}.{ASE name}.p.azurewebsites.net
/// If the App Service is in the multi-tenant service, the name is setup as follows: {App Service name}.azurewebsites.net
/// Puts the IP address list into the AppService object sent in as an argument so it can be used later.
/// </summary>
/// <param name="appService">Object containing all of the information on the App Service we are checking. Includes the ASE name and App Service name, which are directly used here.</param>
public static void GetAppServiceIPAddress(AppService appService, DNSCheckErrors dnsCheckErrors)
{
string fullAppServiceURL = "";
if (appService.IsASE)
{
fullAppServiceURL = appService.AppServiceName + "." + appService.AseName + ".p." + appService.AppServiceURLEnding;
}
else
{
fullAppServiceURL = appService.AppServiceName + "." + appService.AppServiceURLEnding;
}
IDnsResolver resolver = new DnsStubResolver();
try
{
List <IPAddress> addresses = DnsResolverExtensions.ResolveHost(resolver, fullAppServiceURL);
List <string> addressesString = new List <string>();
foreach (IPAddress address in addresses)
{
addressesString.Add(address.ToString());
}
appService.IPAddresses = addressesString;
}
catch
{
dnsCheckErrors.appServiceIPLookupFailed = true;
dnsCheckErrors.currentDNSFailures++;
}
}
public List <ParsedMXARecord> CustomDNSLookup(string domainName, string recordType)
{
List <ParsedMXARecord> customLookup = new List <ParsedMXARecord>();
IDnsResolver resolver = new DnsStubResolver();
try
{
if (recordType == "mx")
{
List <MxRecord> mxRecords = resolver.Resolve <MxRecord>(domainName, RecordType.Mx);
List <ARecord> aRecords = null;
List <IPVulnerabilities> ipVulns = new List <IPVulnerabilities>();
foreach (MxRecord mxRecord in mxRecords)
{
aRecords = resolver.Resolve <ARecord>(mxRecord.ExchangeDomainName, RecordType.A);
foreach (ARecord aRecord in aRecords)
{
if (!aRecord.Address.ToString().IsNullOrWhiteSpace())
{
ipVulns.Add(SPFIPWhoIsLookup(aRecord.Address.ToString(), domainName));
}
}
}
customLookup.Add(new ParsedMXARecord()
{
ipLookup = ipVulns, lookupDomain = domainName
});
}
if (recordType == "a")
{
List <ARecord> aRecords = resolver.Resolve <ARecord>(domainName, RecordType.A);
List <IPVulnerabilities> ipVulns = new List <IPVulnerabilities>();
foreach (ARecord aRecord in aRecords)
{
if (!aRecord.Address.ToString().IsNullOrWhiteSpace())
{
ipVulns.Add(SPFIPWhoIsLookup(aRecord.Address.ToString(), domainName));
}
}
customLookup.Add(new ParsedMXARecord()
{
ipLookup = ipVulns, lookupDomain = domainName
});
}
return(customLookup);
}
catch
{
return(customLookup);
}
}
public ActionResult EmailVerify(string email)
{
var resolver = new DnsStubResolver();
var records = resolver.Resolve <MxRecord>("gmail.com", RecordType.Mx);
foreach (var record in records)
{
Console.WriteLine(record.ExchangeDomainName?.ToString());
}
var addr = new System.Net.Mail.MailAddress(email);
return(Json((new EmailAddressAttribute().IsValid(email)).ToString()));
}
}//end host resolve
public static string recordResolve(string fqdn)
{
bldr.Clear();
var resolver = new DnsStubResolver();
bldr.Append("---------A RECORDS---------" + Environment.NewLine);
var arecords = resolver.Resolve <ARecord>(fqdn, RecordType.A);
foreach (var record in arecords)
{
bldr.Append(record.ToString() + Environment.NewLine);
}
bldr.Append("---------NS RECORDS---------" + Environment.NewLine);
var nsrecords = resolver.Resolve <NsRecord>(fqdn, RecordType.Ns);
foreach (var record in nsrecords)
{
bldr.Append(record.ToString() + Environment.NewLine);
}
bldr.Append("---------CNAME RECORDS---------" + Environment.NewLine);
var crecords = resolver.Resolve <CNameRecord>(fqdn, RecordType.CName);
foreach (var record in crecords)
{
bldr.Append(record.ToString() + Environment.NewLine);
}
bldr.Append("---------MX RECORDS---------" + Environment.NewLine);
var mxrecords = resolver.Resolve <MxRecord>(fqdn, RecordType.Mx);
foreach (var record in mxrecords)
{
bldr.Append(record.ToString() + Environment.NewLine);
}
bldr.Append("---------TXT RECORDS---------" + Environment.NewLine);
var txtrecords = resolver.Resolve <TxtRecord>(fqdn, RecordType.Txt);
foreach (var record in txtrecords)
{
bldr.Append(record.ToString() + Environment.NewLine);
}
bldr.Append("---------CAA RECORDS---------" + Environment.NewLine);
var carecords = resolver.Resolve <CAARecord>(fqdn, RecordType.CAA);
foreach (var record in carecords)
{
bldr.Append(record.ToString() + Environment.NewLine);
}
return(bldr.ToString());
}//end record resolve
private static void Process(string addr)
{
writelogfile();
writelogfile(addr);
if (IsValidEmail(addr) == false)
{
writelogfile();
writelogfile(addr + " is invalid mail address");
// WaitAnyKey();
return;
}
string[] host = (addr.Split('@'));
string hostname = host[1];
var resolver = new DnsStubResolver();
try
{
var records = resolver.Resolve <MxRecord>(hostname, RecordType.Mx);
if (records.Count == 0)
{
writelogfile("MX server don't exists");
return;
}
else
{
int exist = 0;
foreach (var record in records)
{
if (record.ExchangeDomainName?.ToString() != null)
{
string server = record.ExchangeDomainName?.ToString();
writelogfile();
writelogfile(server);
exist = IsEmailAccountValid(server, addr);
// if (exist != 0) writelogfile("\tResp:" + exist.ToString() + ": email account exists");
// else writelogfile("\temail account don't exists");
}
}
}
}
catch (Exception ex)
{
writelogfile("Error : " + ex.Message);
}
}
private IEnumerable <ConnectorInfo> GroupByHost(SendableMail mail)
{
foreach (var recipientGroup in
mail.Recipients
.GroupBy(r => r.Host))
{
var host = recipientGroup.Key;
var connector = mail.Settings as ISendConnector
?? sendConnectors.GetByDomain(host)
?? sendConnectors.DefaultConnector;
string remoteHost;
int remotePort;
if (!connector.UseSmarthost)
{
var records = new DnsStubResolver().Resolve <MxRecord>(recipientGroup.Key);
var record = records.OrderBy(r => r.Preference).FirstOrDefault();
if (record == null)
{
TriggerMailError(mail, new ConnectorInfo
{
Connector = connector,
Host = recipientGroup.Key,
Port = 25,
Addresses = recipientGroup
}, null, new NoMailHostFoundException(recipientGroup.Key));
continue;
}
remoteHost = record.ExchangeDomainName.ToString();
remotePort = 25;
}
else
{
remoteHost = connector.RemoteAddress.ToString();
remotePort = connector.RemotePort;
}
yield return(new ConnectorInfo
{
Connector = connector,
Host = remoteHost,
Port = remotePort,
Addresses = recipientGroup
});
}
}
// Get all MX records for a domain using a recursive resolver
public static void Test4()
{
System.Net.NetworkInformation.IPGlobalProperties ipgp =
System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties();
// IDnsResolver resolver = new RecursiveDnsResolver(); // Warning: Doesn't work
IDnsResolver resolver = new DnsStubResolver();
List <SrvRecord> srvRecords = resolver.Resolve <SrvRecord>("_ldap._tcp." + ipgp.DomainName, RecordType.Srv);
foreach (SrvRecord thisRecord in srvRecords)
{
// System.Console.WriteLine(thisRecord.Name);
System.Console.WriteLine(thisRecord.Target);
System.Console.WriteLine(thisRecord.Port);
string url = "LDAP://" + thisRecord.Target + ":" + thisRecord.Port; // Note: OR LDAPS:// - but Novell doesn't want these parts anyway
System.Console.WriteLine(url);
} // Next thisRecord
}
private void LoadConfiguration()
{
// These could easily be made into configuration points but I think that users would
// find their persistence annoying.
this.DefaultQueryType = DnsQueryType.A;
this.DefaultQueryClass = DnsQueryClass.IN;
this.Resolver = DnsStubResolver.Instance();
try {
this.ExeConfig = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
this.ConfigSection = (NDigSection)this.ExeConfig.Sections[NDigSection.DefaultLocation];
if (this.ConfigSection == null)
{
this.ConfigSection = new NDigSection();
this.ExeConfig.Sections.Add(NDigSection.DefaultLocation, this.ConfigSection);
}
} catch (ConfigurationErrorsException exc) {
_log.Error(exc);
this.ConfigSection = new NDigSection();
WriteLine("WARNING: failed to load configuration: '{0}'", exc.Message);
WritePageBreak();
}
}
public static bool IsValidEmail(string email)
{
bool retVal = false;
if (!string.IsNullOrEmpty(email))
{
int index = email.IndexOf('@');
if (index > 0)
{
string domain = email.Substring(index + 1);
if (validDomains.Contains(domain))
{
return(true);
}
if (invalidDomains.Contains(domain))
{
return(false);
}
DnsStubResolver resolver = new DnsStubResolver();
List <MxRecord> records = resolver.Resolve <MxRecord>(domain, RecordType.Mx);
retVal = records.Count > 0;
if (retVal)
{
validDomains.Add(domain);
}
else
{
invalidDomains.Add(domain);
Console.WriteLine($"Invalid email {email}");
}
}
}
return(retVal);
}
public bool SubDomainSPFNotExists(string domainName)
{
try
{
IDnsResolver resolver = new DnsStubResolver();
List <TxtRecord> txtRecords = resolver.Resolve <TxtRecord>(domainName, RecordType.Txt);
DomainParser domainParser = new DomainParser(new WebTldRuleProvider());
string parentDomain = domainParser.Get(domainName).RegistrableDomain;
txtRecords = resolver.Resolve <TxtRecord>("test1231312312." + parentDomain, RecordType.Txt);
foreach (TxtRecord ip in txtRecords)
{
if (ip.TextData.Contains("v=spf1 "))
{
return(false);
}
}
return(true);
}
catch
{
return(true);
}
}
private static Task <List <TxtRecord> > GetTxtRecords(string hostname)
{
var resolver = new DnsStubResolver();
return(resolver.ResolveAsync <TxtRecord>(hostname, RecordType.Txt));
}
private void ButtonStart_Click(object sender, EventArgs e)
{
try
{
// Резолв имени домена
System.Net.IPAddress[] ip = System.Net.Dns.GetHostAddresses(domainName.Text);
// Определение вхождения IP-адреса в подсеть и вывод информации в поле 'IP-адрес'
if (okby.Contains(ip[0].ToString()))
{
ipAddress.Text = ip[0].ToString() + " (наш хостинг)";
}
else if (hosterby.MatchExists(ip[0].ToString()))
{
ipAddress.Text = ip[0].ToString() + " (hoster.by)";
}
else
{
ipAddress.Text = ip[0].ToString();
}
}
catch (Exception)
{
ipAddress.Clear();
mxRecord.Clear();
nsRecords.Clear();
MessageBox.Show("Введено неверное имя домена или данный домен не существует");
return;
}
// инициализация резолвера ресурсных записей домена
var resolver = new DnsStubResolver();
// определение MX-записи домена
var mxs = resolver.Resolve <MxRecord>(domainName.Text, RecordType.Mx);
String s1;
String[] words = { };
System.Net.IPAddress[] mxip = null;
if (mxs.Any())
{
s1 = mxs[0].ToString();
words = s1.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
// Резолв IP-адреса MX-записи
mxip = System.Net.Dns.GetHostAddresses(words.Last().TrimEnd('.'));
}
// Определение вхождения IP-адреса MX-записи в подсеть и вывод информации в поле 'Почта (MX-запись)'
if (mxs.Any() == false)
{
mxRecord.Text = "Почтовые записи отсутствуют";
}
else if (okby.Contains(mxip[0].ToString()))
{
mxRecord.Text = words.Last().TrimEnd('.') + " (наш хостинг)";
}
else if (hosterby.MatchExists(mxip[0].ToString()))
{
mxRecord.Text = words.Last().TrimEnd('.') + " hoster.by";
}
else
{
mxRecord.Text = words.Last().TrimEnd('.');
}
// определение NS-записей домена
var nss = resolver.Resolve <NsRecord>(domainName.Text, RecordType.Ns);
// вывод NS-записей домена в поле 'DNS-серверы (NS-записи)'
nsRecords.Clear();
nss.Sort();
foreach (NsRecord element in nss)
{
s1 = element.ToString();
String[] wns = s1.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
nsRecords.Text += wns.Last().TrimEnd('.') + '\n';
}
}
public void DoGetHostEntry(string hostname)
{
IDnsResolver resolver = new DnsStubResolver();
RecordType mx = new RecordType();
mx = RecordType.Mx;
//IPHostEntry host;
try
{
//host = Dns.GetHostEntry(hostname);
// This block works but has a problem with parsing only IPs
// becuase it has no AnswerRecords method so you can't filter
// record. It comes with hostname and TTL
List <DnsRecordBase> addresses = resolver.Resolve <DnsRecordBase>(hostname, mx);
//Console.WriteLine("GetHostEntry({0}) returns:", hostname);
// This Block Resolves IP adress depending on DnsClient class
// Has a problem with hostname beacuse it does not takes string
// but a DnsHostname class
/*var response = DnsClient.Default.Resolve(hostname,RecordType.Mx);
* var records = response.AnswerRecords.OfType<MxRecord>();
* foreach (var record in records)
* {
* textBox2.Text = record.ExchangeDomainName.ToString();
* }
*/
//Console.WriteLine(" {0}", ip);
//textBox2.Text = ip.ToString();
foreach (DnsRecordBase host in addresses)
{
textBox2.Text = host.ToString();
}
}
catch (SocketException e)
{
Console.WriteLine("SocketException caught!!!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
textBox2.Text = "Not Found!";
}
catch (ArgumentNullException e)
{
Console.WriteLine("ArgumentNullException caught!!!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
textBox2.Text = "Not Found!";
}
catch (Exception e)
{
Console.WriteLine("Exception caught!!!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
textBox2.Text = "Error!";
}
}
} // End Sub Test1
// Get reverse domain name for a specified IP address using local configured DNS servers
public static void Test2()
{
IDnsResolver resolver = new DnsStubResolver();
ARSoft.Tools.Net.DomainName name = resolver.ResolvePtr(System.Net.IPAddress.Parse("192.0.2.1"));
} // End Sub Test2
// Get reverse domain name for a specified IP address using local configured DNS servers
public static void Test2()
{
IDnsResolver resolver = new DnsStubResolver();
DomainName name = resolver.ResolvePtr(IPAddress.Parse("192.0.2.1"));
}
// Get all addresses for a domain name using the local configured DNS servers
public static void Test1()
{
IDnsResolver resolver = new DnsStubResolver();
List <IPAddress> addresses = resolver.ResolveHost("www.example.com");
}
// Get all addresses for a domain name using the local configured DNS servers
public static void Test1()
{
IDnsResolver resolver = new DnsStubResolver();
System.Collections.Generic.List <System.Net.IPAddress> addresses = resolver.ResolveHost("www.example.com");
} // End Sub Test1
public SPFDMARCRecord GetSPFDMARCRecord(string domainName)
{
bool longSPF = false;
SPFDMARCRecord dnsRecord = new SPFDMARCRecord();
dnsRecord.domainName = domainName;
try
{
IDnsResolver resolver = new DnsStubResolver();
List <TxtRecord> txtRecords = resolver.Resolve <TxtRecord>(domainName, RecordType.Txt);
foreach (TxtRecord ip in Enumerable.Reverse(txtRecords))
{
if (ip.TextData.Contains("v=spf1 "))
{
dnsRecord.spfRecord = ip.TextData;
if (!ip.TextData.Contains("+all") && !ip.TextData.Contains("~all") && !ip.TextData.Contains("-all") && !ip.TextData.Contains("?all"))
{
longSPF = true;
}
}
else if (longSPF)
{
if (ip.TextData.Contains("+all") || ip.TextData.Contains("~all") || ip.TextData.Contains("-all") || ip.TextData.Contains("?all"))
{
dnsRecord.spfRecord += ip.TextData;
}
}
}
try
{
txtRecords = resolver.Resolve <TxtRecord>("_dmarc." + domainName, RecordType.Txt);
foreach (TxtRecord ip in txtRecords)
{
if (ip.TextData.Contains("v=DMARC1"))
{
dnsRecord.dmarcRecord = ip.TextData;
}
}
if (dnsRecord.dmarcRecord.IsNullOrWhiteSpace())
{
throw new Exception();
}
}
catch
{
DomainParser domainParser = new DomainParser(new WebTldRuleProvider());
string parentDomain = domainParser.Get(domainName).RegistrableDomain;
txtRecords = resolver.Resolve <TxtRecord>("_dmarc." + parentDomain, RecordType.Txt);
foreach (TxtRecord ip in txtRecords)
{
if (ip.TextData.Contains("v=DMARC1"))
{
dnsRecord.dmarcRecord = ip.TextData;
}
}
}
}
catch
{
return(dnsRecord);
}
return(dnsRecord);
}
