/// <summary>
/// Forces to update all hints using the given resolver
/// </summary>
/// <param name="resolver">The resolver to use for resolving the new hints</param>
public void Update(IDnsResolver resolver)
{
Zone zone = new Zone(DomainName.Root);
var nameServer = resolver.Resolve<NsRecord>(DomainName.Root, RecordType.Ns);
zone.AddRange(nameServer);
foreach (var nsRecord in nameServer)
{
zone.AddRange(resolver.Resolve<ARecord>(nsRecord.NameServer, RecordType.A));
zone.AddRange(resolver.Resolve<AaaaRecord>(nsRecord.NameServer, RecordType.Aaaa));
}
zone.AddRange(resolver.Resolve<DnsKeyRecord>(DomainName.Root, RecordType.DnsKey).Where(x => x.IsSecureEntryPoint));
LoadZoneInternal(zone);
Save(zone);
}
/// <summary>
/// Forces to update all hints using the given resolver
/// </summary>
/// <param name="resolver">The resolver to use for resolving the new hints</param>
public void Update(IDnsResolver resolver)
{
Zone zone = new Zone(DomainName.Root);
var nameServer = resolver.Resolve<NsRecord>(DomainName.Root, RecordType.Ns);
zone.AddRange(nameServer);
foreach (var nsRecord in nameServer)
{
zone.AddRange(resolver.Resolve<ARecord>(nsRecord.NameServer, RecordType.A));
zone.AddRange(resolver.Resolve<AaaaRecord>(nsRecord.NameServer, RecordType.Aaaa));
}
zone.AddRange(resolver.Resolve<DnsKeyRecord>(DomainName.Root, RecordType.DnsKey).Where(x => x.IsSecureEntryPoint));
LoadZoneInternal(zone);
Save(zone);
}
/// <summary>
/// Queries a dns resolver for IP addresses of a host.
/// </summary>
/// <param name="resolver"> The resolver instance, that should be used for queries </param>
/// <param name="name"> Host name, that should be queried </param>
/// <returns> A list of matching host addresses </returns>
public static List <IPAddress> ResolveHost(this IDnsResolver resolver, DomainName name)
{
List <IPAddress> result = new List <IPAddress>();
List <AaaaRecord> aaaaRecords = resolver.Resolve <AaaaRecord>(name, RecordType.Aaaa);
if (aaaaRecords != null)
{
result.AddRange(aaaaRecords.Select(x => x.Address));
}
List <ARecord> aRecords = resolver.Resolve <ARecord>(name);
if (aRecords != null)
{
result.AddRange(aRecords.Select(x => x.Address));
}
return(result);
}
private async Task <List <ResolvedEndPoint> > ResolveAtLeastOneAndShuffle(IEnumerable <HostAndPort> unresolvedEndPoints, int spinDelay)
{
var unresolvedForLog = unresolvedEndPoints.ToCommaDelimited();
if (FirstDnsTry)
{
FirstDnsTry = false;
}
else
{
m_Log.debug("Since we couldn't resolve any IPs yet, we sleep for a second before retying");
await TaskEx.Delay(spinDelay).ConfigureAwait(false);
}
m_Log.debug($"Trying to resolve at least one IP from hosts:{{{unresolvedForLog}}}");
var resolved = await m_DnsResolver.Resolve(unresolvedEndPoints).ConfigureAwait(false);
if (!resolved.Any())
{
m_Log.debug($"Failed to resolve any IP from hosts:{{{unresolvedForLog}}}");
throw new SocketException((int)SocketError.HostUnreachable);
}
return(Shuffle(resolved).ToList());
}
/// <summary>
/// Queries a dns resolver for specified records.
/// </summary>
/// <typeparam name="T"> Type of records, that should be returned </typeparam>
/// <param name="resolver"> The resolver instance, that should be used for queries </param>
/// <param name="name"> Domain, that should be queried </param>
/// <param name="recordType"> Type the should be queried </param>
/// <param name="recordClass"> Class the should be queried </param>
/// <returns> A list of matching <see cref="DnsRecordBase">records</see> </returns>
public static List <T> Resolve <T>(this IDnsResolver resolver, string name, RecordType recordType = RecordType.A, RecordClass recordClass = RecordClass.INet)
where T : DnsRecordBase
{
return(resolver.Resolve <T>(DomainName.Parse(name), recordType, recordClass));
}
/// <summary>
/// Queries a dns resolver for reverse name of an IP address.
/// </summary>
/// <param name="resolver"> The resolver instance, that should be used for queries </param>
/// <param name="address"> The address, that should be queried </param>
/// <returns> The reverse name of the IP address </returns>
public static DomainName ResolvePtr(this IDnsResolver resolver, IPAddress address)
{
List <PtrRecord> ptrRecords = resolver.Resolve <PtrRecord>(address.GetReverseLookupDomain(), RecordType.Ptr);
return(ptrRecords.Select(x => x.PointerDomainName).FirstOrDefault());
}
private async Task <List <ResolvedEndPoint> > ResolveAndShuffle(IEnumerable <HostAndPort> unresolvedEndPoints)
{
var resolvedEndPoints = await m_DnsResolver.Resolve(unresolvedEndPoints).ConfigureAwait(false);
return(resolvedEndPoints.OrderBy(i => Guid.NewGuid()).ToList());
}
