/// <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());
}
}
internal DNS_RECORD(ARecord record)
{
pNext = IntPtr.Zero;
pName = record.Name;
wType = DNS_TYPE.IPv4Address;
data = record.Address.GetAddressBytes();
dwTtl = record.TTL;
wDataLength = 4;
}
/// <summary>
/// Replaces an A-record on a DNS server
/// </summary>
/// <param name="dnsServer"></param>
/// <param name="newRecord"></param>
/// <param name="security"></param>
/// <param name="username"></param>
/// <param name="domain"></param>
/// <param name="password"></param>
public static void ReplaceARecord(IPAddress dnsServer, ARecord newRecord, DnsUpdateSecurity security, string username, string domain, string password)
{
DNS_RECORD record = new DNS_RECORD(newRecord);
SEC_WINNT_AUTH_IDENTITY sec = new SEC_WINNT_AUTH_IDENTITY();
sec.User = username;
sec.UserLength = username == null ? 0 : username.Length;
sec.Password = password;
sec.PasswordLength = password == null ? 0 : password.Length;
sec.Domain = domain;
sec.DomainLength = domain == null ? 0 : domain.Length;
sec.Flags = 2;
IP4_ARRAY server = new IP4_ARRAY();
server.AddrCount = 1;
server.AddrArray = dnsServer.GetAddressBytes();
IntPtr pRecord = record.Pin();
try
{
int result = 0;
if (Environment.OSVersion.Platform == PlatformID.WinCE)
{
result = NativeMethods.DnsReplaceRecordSetW(pRecord, security, ref sec, server, IntPtr.Zero);
}
else
{
IntPtr pCtx;
NativeMethods.DnsAcquireContextHandle(1, ref sec, out pCtx);
result = NativeMethods.DnsReplaceRecordSetW(pRecord, security, pCtx, server, IntPtr.Zero);
NativeMethods.DnsReleaseContextHandle(pCtx);
}
if (result != 0)
{
throw DnsException.FromErrorCode(result);
}
}
finally
{
record.Free();
}
}