/// <summary>
/// Retrieves an A-record from a DNS server
/// </summary>
/// <param name="dnsServer"></param>
/// <param name="name"></param>
/// <param name="options"></param>
/// <returns></returns>
public static ARecord[] QueryARecord(IPAddress dnsServer, string name, QueryOptions options)
{
IntPtr dnsRecord = IntPtr.Zero;
IP4_ARRAY server = new IP4_ARRAY();
server.AddrCount = 1;
server.AddrArray = dnsServer.GetAddressBytes();
int result = NativeMethods.DnsQuery_W(name, DNS_TYPE.TypeA, options, server, ref dnsRecord, IntPtr.Zero);
if (result != 0)
{
throw DnsException.FromErrorCode(result);
}
using (DNS_RECORD_LIST records = DNS_RECORD_LIST.FromIntPtr(dnsRecord))
{
List <ARecord> list = new List <ARecord>();
foreach (DNS_RECORD record in records)
{
ARecord r = new ARecord();
r.Address = new IPAddress(record.data);
r.Name = record.pName;
r.TTL = (int)record.dwTtl;
list.Add(r);
}
return(list.ToArray());
}
}
public static DNS_RECORD_LIST FromIntPtr(IntPtr ptr)
{
DNS_RECORD_LIST list = new DNS_RECORD_LIST();
DNS_RECORD record = new DNS_RECORD(ptr);
list.Add(record);
return(list);
}
