public override DnsDatagram Query(DnsDatagram request, bool serveStaleAndResetExpiry = false, bool findClosestNameServers = false)
{
if (findClosestNameServers && _prefetchQuery.Equals(request.Question[0]))
{
//return closest name servers so that the recursive resolver queries them to refreshes cache instead of returning response from cache
DnsDatagram authResponse = DnsApplicationQueryClosestDelegation(request);
if (authResponse is null)
{
authResponse = _authZoneManager.QueryClosestDelegation(request);
}
DnsDatagram cacheResponse = _cacheZoneManager.QueryClosestDelegation(request);
if ((authResponse is not null) && (authResponse.Authority.Count > 0))
{
if ((cacheResponse is not null) && (cacheResponse.Authority.Count > 0))
{
if (cacheResponse.Authority[0].Name.Length > authResponse.Authority[0].Name.Length)
{
return(cacheResponse);
}
}
return(authResponse);
}
else
{
return(cacheResponse);
}
}
public override DnsDatagram Query(DnsDatagram request, bool serveStale = false)
{
if (_prefetchQuery.Equals(request.Question[0]))
{
//return closest name servers so that the recursive resolver queries them to refreshes cache instead of returning response from cache
DnsDatagram authResponse = _authZoneManager.QueryClosestDelegation(request);
DnsDatagram cacheResponse = _cacheZoneManager.QueryClosestDelegation(request);
if ((authResponse.Authority.Count > 0) && (cacheResponse.Authority.Count > 0))
{
if (authResponse.Authority[0].Name.Length >= cacheResponse.Authority[0].Name.Length)
{
return(authResponse);
}
return(cacheResponse);
}
else if (authResponse.Authority.Count > 0)
{
return(authResponse);
}
else
{
return(cacheResponse);
}
}
return(base.Query(request, serveStale));
}
public override DnsDatagram Query(DnsDatagram request)
{
if (_prefetchQuery.Equals(request.Question[0]))
{
return(_cacheZoneRoot.QueryCacheGetClosestNameServers(request)); //return closest name servers so that the recursive resolver queries them to refreshes cache instead of returning response from cache
}
return(_cacheZoneRoot.Query(request));
}
public override DnsDatagram Query(DnsDatagram request, bool serveStale = false)
{
if (_prefetchQuery.Equals(request.Question[0]))
{
//return closest name servers so that the recursive resolver queries them to refreshes cache instead of returning response from cache
return(_cacheZoneManager.QueryClosestDelegation(request));
}
return(base.Query(request, serveStale));
}
public override DnsDatagram Query(DnsDatagram request, bool serveStaleAndResetExpiry = false, bool findClosestNameServers = false)
{
if (_prefetchQuestion.Equals(request.Question[0]))
{
//request is for prefetch question
if (!findClosestNameServers)
{
return(null); //dont give answer from cache for prefetch question
}
//return closest name servers so that the recursive resolver queries them to refreshes cache instead of returning response from cache
return(QueryClosestDelegation(request));
}
return(base.Query(request, serveStaleAndResetExpiry, findClosestNameServers));
}