使用DNS SRV記錄與C＃

Question

是否有內置（到.net框架）類或函數來解析SRV條目到相應的記錄？

IE：_dmsc._tcp.network.local到的信息的陣列（主機，端口，重量，優先級）

Answer 1

開源，BSD許可庫這裏：http://dndns.codeplex.com/

Answer 2

替代解決方案：

P /調用DnsQuery功能並通過DNS_TYPE_SRV。

一個例子可以在this excellent post by Ruslan中找到。我重現下面的代碼以防鏈接中斷，但強調直接從他的博客中獲取。

public class nDnsQuery 
{ 
    public nDnsQuery() 
    { 
    } 

    [DllImport("dnsapi", EntryPoint = "DnsQuery_W", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)] 
    private static extern int DnsQuery([MarshalAs(UnmanagedType.VBByRefStr)]ref string pszName, QueryTypes wType, QueryOptions options, int aipServers, ref IntPtr ppQueryResults, int pReserved); 

    [DllImport("dnsapi", CharSet = CharSet.Auto, SetLastError = true)] 
    private static extern void DnsRecordListFree(IntPtr pRecordList, int FreeType); 


    public static string[] GetSRVRecords(string needle) 
    { 

     IntPtr ptr1 = IntPtr.Zero; 
     IntPtr ptr2 = IntPtr.Zero; 
     SRVRecord recSRV; 
     if (Environment.OSVersion.Platform != PlatformID.Win32NT) 
     { 
      throw new NotSupportedException(); 
     } 
     ArrayList list1 = new ArrayList(); 
     try 
     { 

      int num1 = nDnsQuery.DnsQuery(ref needle, QueryTypes.DNS_TYPE_SRV, QueryOptions.DNS_QUERY_BYPASS_CACHE, 0, ref ptr1, 0); 
      if (num1 != 0) 
      { 
       if (num1 == 9003) 
       { 
        list1.Add("DNS record does not exist"); 
       } 
       else 
       { 
        throw new Win32Exception(num1); 
       } 
      } 
      for (ptr2 = ptr1; !ptr2.Equals(IntPtr.Zero); ptr2 = recSRV.pNext) 
      { 
       recSRV = (SRVRecord)Marshal.PtrToStructure(ptr2, typeof(SRVRecord)); 
       if (recSRV.wType == (short)QueryTypes.DNS_TYPE_SRV) 
       { 
        string text1 = Marshal.PtrToStringAuto(recSRV.pNameTarget); 
        text1 += ":" + recSRV.wPort; 
        list1.Add(text1); 
       } 
      } 
     } 
     finally 
     { 
      nDnsQuery.DnsRecordListFree(ptr1, 0); 
     } 
     return (string[])list1.ToArray(typeof(string)); 
    } 

    private enum QueryOptions 
    { 
     DNS_QUERY_ACCEPT_TRUNCATED_RESPONSE = 1, 
     DNS_QUERY_BYPASS_CACHE = 8, 
     DNS_QUERY_DONT_RESET_TTL_VALUES = 0x100000, 
     DNS_QUERY_NO_HOSTS_FILE = 0x40, 
     DNS_QUERY_NO_LOCAL_NAME = 0x20, 
     DNS_QUERY_NO_NETBT = 0x80, 
     DNS_QUERY_NO_RECURSION = 4, 
     DNS_QUERY_NO_WIRE_QUERY = 0x10, 
     DNS_QUERY_RESERVED = -16777216, 
     DNS_QUERY_RETURN_MESSAGE = 0x200, 
     DNS_QUERY_STANDARD = 0, 
     DNS_QUERY_TREAT_AS_FQDN = 0x1000, 
     DNS_QUERY_USE_TCP_ONLY = 2, 
     DNS_QUERY_WIRE_ONLY = 0x100 
    } 

    private enum QueryTypes 
    { 
     DNS_TYPE_A = 0x0001, 
     DNS_TYPE_MX = 0x000f, 
     DNS_TYPE_SRV = 0x0021 
    } 


    [StructLayout(LayoutKind.Sequential)] 
    private struct SRVRecord 
    { 
     public IntPtr pNext; 
     public string pName; 
     public short wType; 
     public short wDataLength; 
     public int flags; 
     public int dwTtl; 
     public int dwReserved; 
     public IntPtr pNameTarget; 
     public short wPriority; 
     public short wWeight; 
     public short wPort; 
     public short Pad; 
    } 
} 

Answer 3

This看起來像另一個偉大的候選人，是Apache 2.0許可。最新版本是星期四2015年12月17日3:00上午