/// <summary>
/// Sends the specified <see cref="AK.Net.Dns.DnsQuery"/> to the specified
/// end point and return the <see cref="AK.Net.Dns.DnsReply"/>.
/// </summary>
/// <param name="query">The query to send.</param>
/// <param name="endpoint">The transport end point.</param>
/// <returns>
/// The <see cref="AK.Net.Dns.DnsReply"/> to the <see cref="AK.Net.Dns.DnsQuery"/>.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown when <paramref name="endpoint"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="AK.Net.Dns.DnsTransportException">
/// Thrown when a transport error occurs.
/// </exception>
public override DnsReply Send(DnsQuery query, IPEndPoint endpoint)
{
Guard.NotNull(endpoint, "endpoint");
DnsReply reply = null;
IDnsTransport transport = SelectTransport(query);
try {
reply = transport.Send(query, endpoint);
} catch (DnsTransportException exc) {
// If the selected transport was TCP, we cannot fail over.
// NOTE this comparison is not thread safe, but at worst it would mean
// the query being sent again.
if (transport == this.TcpTransport)
{
throw;
}
this.Log.Warn("UDP transport failure, failing over to TCP:", exc);
}
if (reply != null)
{
if (!reply.Header.IsTruncated)
{
return(reply);
}
this.Log.InfoFormat("message truncated, failing over to TCP, question={0}", query.Question);
}
return(this.TcpTransport.Send(query, endpoint));
}
static void Main(string[] args)
{
DnsQuery.RegisterImplementation(new PlatformIndependentDnsClient());
var assembly = Path.GetFileNameWithoutExtension(Process.GetCurrentProcess().ProcessName);
string loadingModule = null;
if (!"bruce".Equals(assembly, StringComparison.InvariantCultureIgnoreCase))
{
loadingModule = assembly;
}
var argvIndex = Environment.CommandLine.IndexOf(' ');
string argv = null;
if (argvIndex >= 0)
{
argv = Environment.CommandLine.Substring(argvIndex + 1);
}
var shell = new BruceConsoleShell()
{
CommandLine = argv,
LoadingModule = loadingModule,
Verbose = args.Any(a => string.Equals("--verbose", a, StringComparison.InvariantCultureIgnoreCase)),
Silent = args.Any(a => string.Equals("--silent", a, StringComparison.InvariantCultureIgnoreCase))
};
shell.Start().Wait();
}
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);
}
internal string ResolveEndpointToIpAddress(bool flushCache)
{
DnsResult dnsResult = null;
DnsQuery query = new DnsQuery(DnsRecordType.A, this.endpointHostName);
if (flushCache || LocatorServiceClientAdapter.lastCacheUpdate + 300000 < Environment.TickCount)
{
LocatorServiceClientAdapter.dnsCache.FlushCache();
LocatorServiceClientAdapter.lastCacheUpdate = Environment.TickCount;
}
dnsResult = LocatorServiceClientAdapter.dnsCache.Find(query);
if (dnsResult == null)
{
try
{
IPHostEntry hostEntry = Dns.GetHostEntry(this.endpointHostName);
IPAddress[] addressList = hostEntry.AddressList;
if (addressList.Length > 0)
{
dnsResult = new DnsResult(DnsStatus.Success, addressList[0], TimeSpan.FromMinutes(1.0));
LocatorServiceClientAdapter.dnsCache.Add(query, dnsResult);
}
}
catch (SocketException)
{
}
}
if (dnsResult != null)
{
return(dnsResult.Server.ToString());
}
return(string.Empty);
}
public static DnsResponse From(byte[] buffer, int length)
{
if (buffer == null || length <= 0)
{
return null;
}
DnsQuery query = new DnsQuery(string.Empty, Types.A);
query.data = buffer;
query.length = length;
query.ReadResponse();
return new DnsResponse
{
AdditionalRecords = query.Response.AdditionalRecords,
Answers = query.Response.Answers,
AuthorativeAnswer = query.Response.AuthorativeAnswer,
Authorities = query.Response.Authorities,
IsTruncated = query.Response.IsTruncated,
QueryID = query.Response.QueryID,
ResponseCode = query.Response.ResponseCode,
RecursionRequested = query.Response.RecursionRequested,
RecursionAvailable = query.Response.RecursionAvailable,
Questions = query.Response.Questions
};
}
private static IPAddress GetAnswer()
{
try
{
var dnsClient = new DnsQuery
{
Servers = new ArrayList {
new IPEndPoint(IPAddress.Parse(@"8.8.8.8"), 53)
},
Domain = @"www.google.com",
};
if (dnsClient.Send())
{
if (dnsClient.Response.Answers[0] is Address ip)
{
return(ip.IP);
}
}
return(null);
}
catch
{
return(null);
}
}
private async Task QueryDns(string domain, string servicePrefix, List <DnsRecord> records)
{
var lookup = Invariant($"{servicePrefix}.{domain}");
bool skipLookup = false;
if (DomainServiceNegativeCache.TryGetValue(lookup, out DateTimeOffset expires))
{
if (DateTimeOffset.UtcNow > expires)
{
DomainServiceNegativeCache.TryRemove(lookup, out _);
}
else
{
skipLookup = true;
}
}
if (!skipLookup)
{
this.logger.LogDebug("Querying DNS {Lookup}", lookup);
var dnsResults = await DnsQuery.QuerySrv(lookup);
if (!dnsResults.Any())
{
DomainServiceNegativeCache[lookup] = DateTimeOffset.UtcNow.AddMinutes(5);
this.logger.LogDebug("DNS failed {Lookup} so negative caching", lookup);
}
records.AddRange(dnsResults);
}
}
/// <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);
}
/// <summary>
/// Get an empty error response with the given status code
/// </summary>
/// <param name="query"></param>
/// <param name="statusCode"></param>
/// <returns></returns>
private static DnsResponse GetErrorResponse(DnsQuery query, DnsQueryStatusCode statusCode)
{
var response = new DnsResponse(query, null);
response.StatusCode = statusCode;
return(response);
}
public void GoodDomainTest()
{
var names = DnsQuery.GetMxNames("microsoft.com");
Assert.AreNotEqual(0, names.Count);
names = DnsQuery.GetMxNames("live.com");
Assert.AreNotEqual(0, names.Count);
names = DnsQuery.GetMxNames("live.com.au");
Assert.AreNotEqual(0, names.Count);
names = DnsQuery.GetMxNames("hotmail.com");
Assert.AreNotEqual(0, names.Count);
names = DnsQuery.GetMxNames("gmail.com");
Assert.AreNotEqual(0, names.Count);
names = DnsQuery.GetMxNames("yahoo.com");
Assert.AreNotEqual(0, names.Count);
names = DnsQuery.GetMxNames("bigpond.com.au");
Assert.AreNotEqual(0, names.Count);
names = DnsQuery.GetMxNames("bigpond.com");
Assert.AreNotEqual(0, names.Count);
names = DnsQuery.GetMxNames("student.monash.edu");
Assert.AreNotEqual(0, names.Count);
}
public SrvLookup(ServiceDnsName name, ServiceFactory <TService> factory)
{
Name = name;
Factory = factory;
SrvQuery = new DnsQuery(name.DnsName, DnsRecordType.SRV);
Completion = new TaskCompletionSource <Func <TService> >(this);
}
public void TestFailedLookup()
{
DnsQuery.Debug = true;
var records = DnsQuery.QuerySrv(UnknownSrvRecord);
Assert.AreEqual(0, records.Count());
}
public async Task FailedLookup()
{
DnsQuery.Debug = true;
var records = await DnsQuery.QuerySrv(UnknownSrvRecord);
Assert.AreEqual(0, records.Count());
}
//[ExpectedException(typeof(Win32Exception), ExpectedMessage="DNS name does not exist")]
public void TestQueryInvalidDomain()
{
Assert.Throws <Win32Exception>(() =>
{
const string domain = "thisdomaindoesnotexist123456.net";
DnsQuery.QueryMx(domain);
});
}
public async Task SRV_Fail_Test()
{
var query = new DnsQuery("_unknown._tcp.imprezzio.org", DnsRecordType.SRV);
DnsEntry[] records = await query.TryResolve();
Assert.AreEqual(0, records.Length);
Assert.AreEqual(DnsQueryStatus.NotFound, query.QueryStatus);
}
/// <summary>
/// Encodes and returns the specified <see cref="AK.Net.Dns.DnsQuery"/>.
/// </summary>
/// <param name="query">The query to encode.</param>
/// <returns>The encoded <see cref="AK.Net.Dns.DnsQuery"/>.</returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown when <paramref name="query"/> is <see langword="null"/>.
/// </exception>
protected ArraySegment <byte> WriteQuery(DnsQuery query)
{
Guard.NotNull(query, "query");
using (DnsWireWriter writer = new DnsWireWriter()) {
query.Write(writer);
return(writer.GetBuffer());
}
}
private static bool GetHostStatus(string domainName)
{
if (RuntimeEnvironment.Environment == ApplicationEnvironment.Dev && domainName == RuntimeEnvironment.TestEmailDomain)
{
return(true);
}
var exchangeNames = DnsQuery.GetMxNames(domainName);
return(exchangeNames.Count > 0);
}
public void BadDomainTest()
{
var names = DnsQuery.GetMxNames("hotmai.com");
Assert.AreEqual(0, names.Count);
names = DnsQuery.GetMxNames("yahoo.co.au");
Assert.AreEqual(0, names.Count);
names = DnsQuery.GetMxNames("bigpand.net");
Assert.AreEqual(0, names.Count);
}
public void TestQueryMxGoogle()
{
const string domain = "google.com";
Log.InfoFormat("Query domain '{0}'", domain);
var mailExchangers = DnsQuery.QueryMx(domain);
LogMxs(domain, mailExchangers);
Assert.IsNotNull(mailExchangers);
Assert.AreEqual(5, mailExchangers.Count());
}
public void TestQueryMxTrademe()
{
const string domain = "trademe.co.nz";
Log.InfoFormat("Query domain '{0}'", domain);
var mailExchangers = DnsQuery.QueryMx(domain);
LogMxs(domain, mailExchangers);
Assert.IsNotNull(mailExchangers);
Assert.AreEqual(mailExchangers.Count(), 8);
}
public void TestQueryMxSlashdot()
{
const string domain = "slashdot.org";
Log.InfoFormat("Query domain '{0}'", domain);
var mailExchangers = DnsQuery.QueryMx(domain);
LogMxs(domain, mailExchangers);
Assert.IsNotNull(mailExchangers);
Assert.AreEqual(mailExchangers.Count(), 1);
}
/// <summary>
/// Creates a query containing the specified <paramref name="question"/>.
/// </summary>
/// <param name="question">The DNS question.</param>
/// <returns>A new <see cref="AK.Net.Dns.DnsQuery"/>.</returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown when <paramref name="question"/> is <see langword="null"/>.
/// </exception>
protected virtual DnsQuery CreateQuery(DnsQuestion question)
{
Guard.NotNull(question, "question");
DnsQuery query = new DnsQuery();
query.Header.Id = DnsResolver.GenerateQueryId();
query.Header.IsRecursionDesired = true;
query.Questions.Add(question);
return(query);
}
public async Task SRV_Query_Speed_Test()
{
for (int i = 0; i < 20; i++)
{
DateTime start = DateTime.UtcNow;
var query = new DnsQuery("_ldap._tcp.imprezzio.org", DnsRecordType.SRV);
await query.Resolve();
double ms = DateTime.UtcNow.Subtract(start).TotalMilliseconds;
Console.WriteLine($"[{i}] = {ms}ms");
}
}
public void TestQueryMxGoogle()
{
const string domain = "google.com";
Log.Info("Query domain '{0}'", domain);
var mailExchangers = DnsQuery.QueryMx(domain);
LogMxs(domain, mailExchangers);
mailExchangers.ShouldNotBeNull();
5.ShouldEqual(mailExchangers.Count());
}
public void TestQueryMxSlashdot()
{
const string domain = "slashdot.org";
Log.Info("Query domain '{0}'", domain);
var mailExchangers = DnsQuery.QueryMx(domain);
LogMxs(domain, mailExchangers);
mailExchangers.ShouldNotBeNull();
mailExchangers.Count().ShouldEqual(1);
}
public void TestQueryMxTrademe()
{
const string domain = "trademe.co.nz";
Log.Info("Query domain '{0}'", domain);
var mailExchangers = DnsQuery.QueryMx(domain);
LogMxs(domain, mailExchangers);
mailExchangers.ShouldNotBeNull();
mailExchangers.ShouldNotBeEmpty();
mailExchangers.Count().ShouldBeGreaterThanOrEqualTo(3);
}
public static ArrayList GetListNameServers()
{
ArrayList nameServers = new ArrayList();
IList <IPAddress> machineDnsServers = DnsQuery.GetMachineDnsServers();
foreach (IPAddress ipAddress in machineDnsServers)
{
nameServers.Add(ipAddress.ToString());
}
return(nameServers);
}
public void TestQuerySrvRecordHittingInternet()
{
DnsQuery.Debug = true;
var records = DnsQuery.QuerySrv(ExternalSrvRecord);
Assert.IsTrue(records.Count() > 0);
var srv = records.Single(r => r.Type == DnsRecordType.SRV);
Assert.AreEqual("sipdir.online.lync.com", srv.Target);
Assert.AreEqual(443, srv.Port);
}
public void TestDNsQuery()
{
var DNSquery = new DnsQuery("www.google.com", id: 0x00003245);
var actual = DNSquery.GetBytes();
var expected = new byte[] {
0x32, 0x45, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77,
06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01
};
Assert.Equal(expected, actual);
}
public static void Main(string[] args)
{
var nameServers = AKDns.GetNameServers("rcmap.co.uk.");
var mxInfo = AKDns.GetMXInfo("rcmap.co.uk.");
IDnsTransport transport = new DnsUdpTransport();
DnsQuery query = new DnsQuery();
query.Questions.Add(new DnsQuestion("rcmap.co.uk.", DnsQueryType.A, DnsQueryClass.IN));
DnsReply reply = transport.Send(query, new IPEndPoint(IPAddress.Parse("8.8.8.8"), DnsTransport.DnsPort));
}
public static DnsResponse Resolver(DnsQuery query)
{
const uint TimeToLive = 300;
var response = query.CreateResponse();
switch (query.QueryType)
{
// Resolve all A queries to localhost
case RecordType.A:
var aResourceRecord = new AResourceRecord(query, TimeToLive, IPAddress.Loopback);
response.AnswerRecords.Add(aResourceRecord);
break;
// Resolve all TXT to "Hello World"
case RecordType.TXT:
var txtResourceRecord = new TxtResourceRecord(query, TimeToLive, new []{ "Hello world"});
response.AnswerRecords.Add(txtResourceRecord);
break;
}
return response;
}
/// <summary>
/// Get an empty error response with the given status code
/// </summary>
/// <param name="query"></param>
/// <param name="statusCode"></param>
/// <returns></returns>
private static DnsResponse GetErrorResponse(DnsQuery query, DnsQueryStatusCode statusCode)
{
var response = new DnsResponse(query, null);
response.StatusCode = statusCode;
return response;
}
public void Send(DnsQuery query)
{
System.Net.Dns.GetHostAddresses("");
}
public DnsResponse(DnsQuery query) :
this(query.MessageId, query.QueryName, query.QueryType, query.QueryClass)
{
}
public AResourceRecord(DnsQuery query, uint timeToLive, IPAddress ipAddress)
:base(query, timeToLive)
{
this.ipAddress = ipAddress;
}
public CnameResourceRecord(DnsQuery query, uint timeToLive, DnsName dnsName)
: base(query, timeToLive)
{
this.dnsName = dnsName;
}
public void Extracts_TransactionId_Correctly_From_Well_Formed_Question()
{
var dnsQuery = new DnsQuery(test_dot_cocktail_dot_local_A_Record);
Assert.That(dnsQuery.Header.TransactionId, Is.EqualTo(1));
}
protected ResourceRecordBase(DnsQuery query, uint timeToLive)
: this(query.QueryName, query.QueryType, query.QueryClass, timeToLive)
{
}
public TxtResourceRecord(DnsQuery query, uint timeToLive, string[] strings)
: base(query, timeToLive)
{
this.strings = strings;
}
