是否有内置(到.net框架)类或函数来解析SRV条目到相应的记录?
IE:_dmsc._tcp.network.local到一组信息(主机,端口,重量,优先级)
答案 0 :(得分:5)
这里的开源,BSD许可库:http://dndns.codeplex.com/
答案 1 :(得分:5)
替代解决方案:
P /调用DnsQuery
函数并传递DNS_TYPE_SRV。
可以在this excellent post by Ruslan中找到一个示例。如果链接断开,我会重现下面的代码,但强调它是直接从他的博客中获取的。
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;
}
}
答案 2 :(得分:0)
snapshot/restore看起来像另一个伟大的候选人,并获得Apache 2.0许可。最新版本是2015年12月17日星期四凌晨3点