public Task HandleDnsConnection(InConnectionDns dns) { var req = dns.DnsRequest; var name = TryGetName(req.Name); if (name == null) { dns.RedirectTo(if_notmatch); return(NaiveUtils.CompletedTask); } if (name.Length == 0 || name == list_name) { return(dns.SetResult(new DnsResponse(this, new IPAddress((long)listIp)))); } var clis = FindClientsByName(name); if (clis.Count > 0) { return(dns.SetResult(new DnsResponse(this, clis.Select(x => x.Ip).ToArray()))); } else { if (if_notfound == null) { return(dns.SetResult(DnsResponse.Empty(this))); } dns.RedirectTo(if_notfound); return(NaiveUtils.CompletedTask); } }
private async Task ResolveNameCore(InConnectionDns dns) { IPAddress[] addresses = await Dns.GetHostAddressesAsync(dns.RequestName); await dns.SetResult(new DnsResponse(this, addresses)); }
private async Task ResolveName(InConnectionDns cxn) { var name = cxn.Dest.Host; var req = dnsClient.Create(); var domain = new Domain(name); req.Questions.Add(new Question(domain, cxn.RequestType != DnsRequestType.AAAA ? RecordType.A : RecordType.AAAA)); req.OperationCode = OperationCode.Query; req.RecursionDesired = true; IResponse r; try { r = await req.Resolve(); } catch (ResponseException e) { var emptyResp = DnsResponse.Empty(this); emptyResp.Result = ConnectResultEnum.Failed; emptyResp.FailedReason = e.Message; await cxn.SetResult(emptyResp); return; } if (r.ResponseCode != ResponseCode.NoError) { Logger.warning("resolving " + name + ": server returns " + r.ResponseCode); } int count = 0; foreach (var item in r.AnswerRecords) { if (item.Type == RecordType.A || item.Type == RecordType.AAAA) { count++; } } if (count == 0) { if (r.AnswerRecords.Count == 0) { Logger.warning("resolving " + name + ": no answer records"); } else { Logger.warning("resolving " + name + ": answer records without A/AAAA records"); } } var arr = new IPAddress[count]; int?ttl = null; int cur = 0; foreach (var item in r.AnswerRecords) { if (item.Type == RecordType.A || item.Type == RecordType.AAAA) { arr[cur++] = ((IPAddressResourceRecord)item).IPAddress; int newTtl = (int)item.TimeToLive.TotalSeconds; ttl = ttl.HasValue ? Math.Min(newTtl, ttl.Value) : newTtl; } } var resp = new DnsResponse(this, arr) { TTL = ttl }; await cxn.SetResult(resp); }