Example #1
0
        public async Task <DnsResult> GetDnsTxtRecord(string domain, string dnsServer)
        {
            DnsResult result = new DnsResult();

            var dns = new MyDns();

            if (!await dns.Search(domain, QueryType.TXT, dnsServer, null))
            {
                result.Success     = false;
                result.RecordValue = string.Empty;
                switch (dns.header.ResultCode)
                {
                case ResultCode.OK:
                    result.ErrorMessage = "ok";
                    break;

                case ResultCode.FormatErr:
                    result.ErrorMessage = "格式错误";
                    break;

                case ResultCode.DNSErr:
                    result.ErrorMessage = "DNS出错";
                    break;

                case ResultCode.DomainNoExist:
                    result.ErrorMessage = "域名不存在";
                    break;

                case ResultCode.DNSNoSuppot:
                    result.ErrorMessage = "DNS不支持这类查询";
                    break;

                case ResultCode.DNSRefuse:
                    result.ErrorMessage = "DNS拒绝查询";
                    break;

                default:
                    result.ErrorMessage = "未知错误";
                    break;
                }


                return(result);
            }
            else
            {
                result.Success     = true;
                result.RecordValue = dns.record?.Records?.FirstOrDefault()?.RDDate?.ToString();
            }

            return(result);
        }
Example #2
0
        public void Parse(byte[] data, int offset)
        {
            while (offset < data.Length)
            {
                int         labelLen;
                MyDnsRecord RecordItem = new MyDnsRecord();
                RecordItem.Name = MyDns.GetLabelName(data, offset, out labelLen);
                offset         += labelLen;
                //
                offset++;
                RecordItem.QType = (QueryType)data[++offset];
                //
                offset++;
                RecordItem.QClass = (QueryClass)data[++offset];
                //
                offset++;
                RecordItem.TTL = data[offset++] * 256 * 256 * 256 + data[offset++] * 256 * 256 + data[offset++] * 256 + data[offset++];
                //
                RecordItem.RDLength = data[offset++] * 256 + data[offset++];
                //
                switch (RecordItem.QType)
                {
                case QueryType.A:
                    RecordItem.RDDate = new A_RR(data, offset, RecordItem.RDLength);
                    break;

                case QueryType.CNAME:
                    RecordItem.RDDate = new CNAME_RR(data, offset, RecordItem.RDLength);
                    break;

                case QueryType.MX:
                    RecordItem.RDDate = new MX_RR(data, offset, RecordItem.RDLength);
                    break;

                case QueryType.NS:
                    RecordItem.RDDate = new NS_RR(data, offset, RecordItem.RDLength);
                    break;

                case QueryType.SOA:
                    RecordItem.RDDate = new SOA_RR(data, offset, RecordItem.RDLength);
                    break;

                case QueryType.TXT:
                    RecordItem.RDDate = new TXT_RR(data, offset, RecordItem.RDLength);
                    break;
                }
                Records.Add(RecordItem);
                offset += RecordItem.RDLength;
            }
        }