// Copied from the old version of DNS.cs
// Returns a list of our local addresses by calling gethostbyname with null.
//
private static IPHostEntry GetLocalHost()
{
#if MONO
return(Dns.GetHostEntry(string.Empty));
#else
//
// IPv6 Changes: If IPv6 is enabled, we can't simply use the
// old IPv4 gethostbyname(null). Instead we need
// to do a more complete lookup.
//
if (Socket.SupportsIPv6)
{
//
// IPv6 enabled: use getaddrinfo() of the local host name
// to obtain this information. Need to get the machines
// name as well - do that here so that we don't need to
// Assert DNS permissions.
//
StringBuilder hostname = new StringBuilder(HostNameBufferLength);
SocketError errorCode =
UnsafeNclNativeMethods.OSSOCK.gethostname(
hostname,
HostNameBufferLength);
if (errorCode != SocketError.Success)
{
throw new SocketException();
}
return(Dns.GetHostByName(hostname.ToString()));
}
else
{
//
// IPv6 disabled: use gethostbyname() to obtain information.
//
IntPtr nativePointer =
UnsafeNclNativeMethods.OSSOCK.gethostbyname(
null);
if (nativePointer == IntPtr.Zero)
{
throw new SocketException();
}
return(Dns.NativeToHostEntry(nativePointer));
}
#endif
} // GetLocalHost