As I mentioned above, I once re-implemented NAT as a C++/CLI class library having the interface below. However, it’s a little complicated for the sample and I also need to preserve some sugar cubes for the customers.
// natcl.h
#pragma once
using namespace System;
using namespace Collections::Generic;
using namespace Threading;
using namespace msclr::interop;
namespace nat_managed_lib
{
public ref class managed_network_adapter_info sealed
{
String^ adapter_name_;
String^ friendly_name_;
List<String^>^ ip_addresses_;
public:
property String^ AdapterName
{
String^ get() { return adapter_name_; }
void set(String^ value) { adapter_name_ = value; }
}
property String^ FriendlyName
{
String^ get() { return friendly_name_; }
void set(String^ value) { friendly_name_ = value; }
}
property List<String^>^ IpAddresses
{
List<String^>^ get() { return ip_addresses_; }
void set(List<String^>^ value) { ip_addresses_ = value; }
}
};
public ref class nat_wrapper sealed
{
public:
event EventHandler^ AdaptersListChangeEvent;
private:
ManualResetEvent^ adapters_list_change_notify_event_;
Thread^ adapter_list_change_notify_thread_;
volatile bool is_adapter_list_change_thread_active_ = true;
bool set_adapter_list_change_event();
void adapter_list_change_thread();
native::nat_unmanaged* native_nat_provider_;
public:
explicit nat_wrapper(String^ device_name);
!nat_wrapper();
~nat_wrapper();
List<managed_network_adapter_info^>^ get_network_adapters();
Boolean set_nat_parameters(
// provider interface name
String^ provider,
// client interface name
String^ client,
// provider IP address to be used for NAT (adapter may have multiply IP addresses)
String^ nat_ip,
// DNS IP address for DNS forwarding
String^ dns_ip,
// Enable DNS forwarding (redirect DNS requests to the IP above). Otherwise client provided IP is used for DNS.
Boolean dns_forwarding
);
Boolean start_nat();
Boolean stop_nat();
Boolean is_started();
Boolean is_ip_routing_dynamic_success();
void re_initialize();
Boolean block_client_ip_address(String^ ip_address);
Boolean block_client_mac_address(String^ mac_address);
};
}
.
