private void ConfigureService()
{
_masterFile = new MasterFile();
var soaoptions = new StartOfAuthorityResourceRecord.Options()
{
SerialNumber = GenerateSerialNumber(),
RefreshInterval = new TimeSpan(0, 0, _options.Value.RefreshInterval),
RetryInterval = new TimeSpan(0, 0, _options.Value.RetryInterval),
ExpireInterval = new TimeSpan(0, 0, _options.Value.ExpireInterval),
MinimumTimeToLive = new TimeSpan(0, 0, _options.Value.MinTTL)
};
var domain = new Domain(_options.Value.Domain);
var soa = new StartOfAuthorityResourceRecord(
domain, domain, domain, soaoptions, new TimeSpan(0, 0, _options.Value.TTL));
_masterFile.Add(soa);
var record = new IPAddressResourceRecord(
new Domain(GetRecordFqdn()), IPAddress.Parse(_options.Value.TargetNormal), new TimeSpan(0, 0, _options.Value.RecordTtl));
_masterFile.Add(record);
_server = new DnsServer(_masterFile, _options.Value.Forwarder);
_server.Listening += ServerListening;
_server.Responded += ServerResponded;
_server.Errored += ServerErrored;
}
public Task <IResponse> Resolve(IRequest request)
{
IResponse response = Response.FromRequest(request);
response.AuthorativeServer = true;
foreach (Question question in response.Questions)
{
if (question.Type == RecordType.A)
{
string requestDomain = question.Name.ToString().ToLower();
string emailDomain = GetEmailDomain(requestDomain);
RequestReceived?.Invoke(this, new RequestEventArgs(response.Id, requestDomain, emailDomain));
if (emailDomain != null)
{
var(isValid, ttl) = GetEmailDomainState(emailDomain);
if (isValid)
{
var soaRecord = new StartOfAuthorityResourceRecord(_dnsServerDomain, _dnsServerDomain, _responsiblePersonDomain, _serial,
TimeSpan.FromDays(2), TimeSpan.FromDays(1), TimeSpan.FromDays(30), ttl, TimeSpan.FromDays(14));
response.AuthorityRecords.Add(soaRecord);
response.ResponseCode = ResponseCode.NameError;
ResponseSent?.Invoke(this, new ResponseEventArgs(response.Id, requestDomain, emailDomain, ResponseResult.Valid, ttl));
}
else
{
var record = new IPAddressResourceRecord(question.Name, s_loopbackIpAddress, ttl);
response.AnswerRecords.Add(record);
ResponseSent?.Invoke(this, new ResponseEventArgs(response.Id, requestDomain, emailDomain, ResponseResult.Invalid, ttl));
}
}
else
{
// Invalid domain name request, cache for 1000 days
var ttl = TimeSpan.FromDays(1000);
var soaRecord = new StartOfAuthorityResourceRecord(question.Name, _dnsServerDomain, _responsiblePersonDomain, _serial,
TimeSpan.FromDays(2), TimeSpan.FromDays(1), TimeSpan.FromDays(30), ttl, ttl);
response.AuthorityRecords.Add(soaRecord);
response.ResponseCode = ResponseCode.FormatError;
ResponseSent?.Invoke(this, new ResponseEventArgs(response.Id, requestDomain, emailDomain, ResponseResult.Error, ttl));
}
}
}
return(Task.FromResult(response));
}
public void WhenSave_AndMasterListContainsStartOfAuthorityResourceRecord_ThenEntryIsSaved()
{
// Arrange
var domain = new Domain("stratis.test.com");
var masterDomain = new Domain("master.test.com");
var responsibleDomain = new Domain("responsible.test.com");
long serialNumber = 12121212;
var refreshInterval = new TimeSpan(1111111111);
var retryInterval = new TimeSpan(2222222222);
var expireInterval = new TimeSpan(3333333333);
var minimumTimeToLive = new TimeSpan(4444444444);
var testResourceRecord =
new StartOfAuthorityResourceRecord(
domain,
masterDomain,
responsibleDomain,
serialNumber,
refreshInterval,
retryInterval,
expireInterval,
minimumTimeToLive);
var masterFile = new DnsSeedMasterFile(new List <IResourceRecord> {
testResourceRecord
});
using (var stream = new MemoryStream())
{
// Act.
masterFile.Save(stream);
// Assert.
stream.Should().NotBeNull();
IList <IResourceRecord> resourceRecords = this.ReadResourceRecords(stream);
resourceRecords.Should().NotBeNull();
resourceRecords.Should().NotBeNullOrEmpty();
IList <StartOfAuthorityResourceRecord> startOfAuthorityResourceRecord = resourceRecords.OfType <StartOfAuthorityResourceRecord>().ToList();
startOfAuthorityResourceRecord.Should().HaveCount(1);
startOfAuthorityResourceRecord[0].Name.ToString().Should().Be(domain.ToString());
startOfAuthorityResourceRecord[0].MasterDomainName.ToString().Should().Be(masterDomain.ToString());
startOfAuthorityResourceRecord[0].ResponsibleDomainName.ToString().Should().Be(responsibleDomain.ToString());
startOfAuthorityResourceRecord[0].SerialNumber.Should().Be(serialNumber);
startOfAuthorityResourceRecord[0].RefreshInterval.Should().Be(refreshInterval);
startOfAuthorityResourceRecord[0].RetryInterval.Should().Be(retryInterval);
startOfAuthorityResourceRecord[0].ExpireInterval.Should().Be(expireInterval);
startOfAuthorityResourceRecord[0].MinimumTimeToLive.Should().Be(minimumTimeToLive);
}
}
/// <summary>
/// Writes a <see cref="StartOfAuthorityResourceRecord"/> to JSON.
/// </summary>
/// <param name="resourceRecord">The <see cref="StartOfAuthorityResourceRecord"/> to write.</param>
/// <returns>The written JSON.</returns>
private JObject WriteStartOfAuthorityResourceRecordJson(StartOfAuthorityResourceRecord resourceRecord, JsonSerializer serializer)
{
return(new JObject
{
{ TypeFieldName, resourceRecord.GetType().Name },
{ NameFieldName, resourceRecord.Name.ToString() },
{ MasterDomainNameFieldName, resourceRecord.MasterDomainName.ToString() },
{ ResponsibleDomainNameFieldName, resourceRecord.ResponsibleDomainName.ToString() },
{ SerialNumberFieldName, resourceRecord.SerialNumber },
{ RefreshIntervalFieldName, JToken.FromObject(resourceRecord.RefreshInterval, serializer) },
{ RetryIntervalFieldName, JToken.FromObject(resourceRecord.RetryInterval, serializer) },
{ ExpireIntervalFieldName, JToken.FromObject(resourceRecord.ExpireInterval, serializer) },
{ MinimumTimeToLiveFieldName, JToken.FromObject(resourceRecord.MinimumTimeToLive, serializer) }
});
}
public void WhenLoad_AndStreamContainsStartOfAuthorityResourceRecord_ThenEntryIsPopulated()
{
// Arrange
var domain = new Domain("stratis.test.com");
var masterDomain = new Domain("master.test.com");
var responsibleDomain = new Domain("responsible.test.com");
long serialNumber = 12121212;
var refreshInterval = new TimeSpan(1111111111);
var retryInterval = new TimeSpan(2222222222);
var expireInterval = new TimeSpan(3333333333);
var minimumTimeToLive = new TimeSpan(4444444444);
var testResourceRecord =
new StartOfAuthorityResourceRecord(
domain,
masterDomain,
responsibleDomain,
serialNumber,
refreshInterval,
retryInterval,
expireInterval,
minimumTimeToLive);
var question = new Question(domain, RecordType.SOA);
// Act.
IList <IResourceRecord> resourceRecords = this.WhenLoad_AndStreamContainsEntry_ThenEntryIsPopulated(testResourceRecord, question);
// Assert.
resourceRecords.Should().NotBeNull();
resourceRecords.Should().NotBeNullOrEmpty();
IList <StartOfAuthorityResourceRecord> startOfAuthorityResourceRecord = resourceRecords.OfType <StartOfAuthorityResourceRecord>().ToList();
startOfAuthorityResourceRecord.Should().HaveCount(1);
startOfAuthorityResourceRecord[0].Name.ToString().Should().Be(domain.ToString());
startOfAuthorityResourceRecord[0].MasterDomainName.ToString().Should().Be(masterDomain.ToString());
startOfAuthorityResourceRecord[0].ResponsibleDomainName.ToString().Should().Be(responsibleDomain.ToString());
startOfAuthorityResourceRecord[0].SerialNumber.Should().Be(serialNumber);
startOfAuthorityResourceRecord[0].RefreshInterval.Should().Be(refreshInterval);
startOfAuthorityResourceRecord[0].RetryInterval.Should().Be(retryInterval);
startOfAuthorityResourceRecord[0].ExpireInterval.Should().Be(expireInterval);
startOfAuthorityResourceRecord[0].MinimumTimeToLive.Should().Be(minimumTimeToLive);
}
// A request resolver that resolves all dns queries to localhost
public async Task <IResponse> Resolve(IRequest request, CancellationToken cancellationToken = default)
{
try
{
IResponse response = Response.FromRequest(request);
foreach (Question question in response.Questions)
{
if (question.Type == RecordType.SOA || question.Type == RecordType.NS)
{
var record = new StartOfAuthorityResourceRecord(question.Name, _nsDomains[0], _email,
_timeStamp, _ttl, _ttl, _ttl, _ttl, _ttl);
response.AuthorityRecords.Add(record);
if (question.Type == RecordType.NS)
{
foreach (var t in _nsDomains)
{
response.AnswerRecords.Add(new NameServerResourceRecord(question.Name, t, _ttl));
}
}
}
if (question.Type == RecordType.TXT)
{
if (!string.IsNullOrEmpty(_txtUrl))
{
var httpClient = _clientFactory.CreateClient();
// var requestMessage = new HttpRequestMessage(HttpMethod.Get, _txtUrl);
var txtResponse = await httpClient.GetAsync(_txtUrl, cancellationToken);
List <KeyValue> txtValues = null;
if (txtResponse.IsSuccessStatusCode)
{
// var jsonString = await txtResponse.Content.ReadAsStringAsync();
txtValues = await JsonSerializer.DeserializeAsync <List <KeyValue> >(await txtResponse.Content.ReadAsStreamAsync(), cancellationToken : cancellationToken);
}
if (txtValues != null)
{
foreach (var keyValue in txtValues)
{
if (question.Name.ToString().ToLower().EndsWith(keyValue.key))
{
IList <CharacterString> characterStrings = new List <CharacterString> {
new CharacterString(keyValue.value)
};
response.AnswerRecords.Add(new TextResourceRecord(question.Name, characterStrings, _ttl));
}
else
{
response.AnswerRecords.Add(new TextResourceRecord(question.Name, keyValue.key, keyValue.value, _ttl));
}
}
}
}
}
var name = question.Name.ToString().ToLower().Split('.');
//check the base domain is the same.
if (name.Length >= _rootDomainComponents.Length && name
.Skip(name.Length - _rootDomainComponents.Length).SequenceEqual(_rootDomainComponents))
{
// match any static A records.
var key = string.Join('.', name.Take(name.Length - _rootDomainComponents.Length));
if (_ipAddressRecords.TryGetValue(key, out var ipAddress))
{
response.AnswerRecords.Add(new IPAddressResourceRecord(question.Name, ipAddress, _ttl));
}
// query the domain to determine ip. Format 1-2-3-4.hash.dexih.com
var domain = question.Name.ToString().Split(".");
if (domain.Length == 4)
{
if (IPAddress.TryParse(domain[0].Replace('-', '.'), out var iPAddress))
{
var record = new IPAddressResourceRecord(question.Name, iPAddress, _ttl);
response.AnswerRecords.Add(record);
}
}
}
}
return(response);
}
catch (Exception e)
{
_logger?.LogError(e, $"The following error was encountered: {e.Message}.");
var response = new Response {
ResponseCode = ResponseCode.NoError
};
return(response);
}
}