public static void CreateRoute(string destination, string mask, int interfaceIndex, int metric)
{
NetworkAdaptor adaptor = NicInterface.GetNetworkAdaptor(interfaceIndex);
var route = new NativeMethods.MIB_IPFORWARDROW
{
dwForwardDest = BitConverter.ToUInt32(IPAddress.Parse(destination).GetAddressBytes(), 0),
dwForwardMask = BitConverter.ToUInt32(IPAddress.Parse(mask).GetAddressBytes(), 0),
dwForwardNextHop = BitConverter.ToUInt32(IPAddress.Parse(adaptor.PrimaryGateway.ToString()).GetAddressBytes(), 0),
dwForwardMetric1 = Convert.ToUInt32(metric),
dwForwardType = Convert.ToUInt32(3), //Default to 3
dwForwardProto = Convert.ToUInt32(3), //Default to 3
dwForwardAge = 0,
dwForwardIfIndex = Convert.ToUInt32(interfaceIndex)
};
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(NativeMethods.MIB_IPFORWARDROW)));
try
{
Marshal.StructureToPtr(route, ptr, false);
var status = NativeMethods.CreateIpForwardEntry(ptr);
}
finally
{
Marshal.FreeHGlobal(ptr);
}
}
public static List <NetworkAdaptor> GetAllNetworkAdaptor()
{
List <NetworkAdaptor> naList = new List <NetworkAdaptor>();
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in nics)
{
IPInterfaceProperties properties = adapter.GetIPProperties();
IPv4InterfaceProperties ip4Properties = null;
if (!HasIp4Support(adapter))
{
continue;
}
else
{
ip4Properties = properties.GetIPv4Properties();
}
NetworkAdaptor na = new NetworkAdaptor();
na.Name = adapter.Name;
na.Description = adapter.Description;
na.MACAddress = adapter.GetPhysicalAddress().ToString();
na.InterfaceIndex = ip4Properties != null ? ip4Properties.Index : 0;
na.PrimaryIpAddress = properties.UnicastAddresses.Where(i => i.Address.AddressFamily == AddressFamily.InterNetwork)?.First()?.Address;
na.SubnetMask = properties.UnicastAddresses.Where(i => i.Address.AddressFamily == AddressFamily.InterNetwork)?.First()?.IPv4Mask;
if (properties.GatewayAddresses.Count > 0)
{
na.PrimaryGateway = null;
foreach (GatewayIPAddressInformation gatewayInfo in properties.GatewayAddresses)
{
if (gatewayInfo.Address != null && gatewayInfo.Address.AddressFamily == AddressFamily.InterNetwork)
{
na.PrimaryGateway = gatewayInfo.Address;
break;
}
}
}
else
{
//if the gateways on the Network adaptor properties is null, then get it from the routing table
List <Ip4RouteEntry> routeTable = Ip4RouteTable.GetRouteTable();
if (routeTable.Where(i => i.InterfaceIndex == na.InterfaceIndex).Count() > 0)
{
na.PrimaryGateway = routeTable.Where(i => i.InterfaceIndex == na.InterfaceIndex)?.First()?.GatewayIP;
}
}
if (na.PrimaryGateway == null && properties.DhcpServerAddresses.Count > 0)
{
na.PrimaryGateway = properties.DhcpServerAddresses.First();
}
naList.Add(na);
}
return(naList);
}
public static NetworkAdaptor GetNetworkAdaptor(int interfaceIndex)
{
NetworkAdaptor na = null;
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in nics)
{
IPInterfaceProperties properties = adapter.GetIPProperties();
if (!HasIp4Support(adapter))
{
continue;
}
IPv4InterfaceProperties ip4Properties = properties.GetIPv4Properties();
if (properties.GetIPv4Properties().Index == interfaceIndex)
{
na = new NetworkAdaptor();
na.Name = adapter.Name;
na.Description = adapter.Description;
na.MACAddress = adapter.GetPhysicalAddress().ToString();
na.InterfaceIndex = ip4Properties.Index;
na.PrimaryIpAddress = properties.UnicastAddresses.Where(i => i.Address.AddressFamily == AddressFamily.InterNetwork)?.First()?.Address;
na.SubnetMask = properties.UnicastAddresses.Where(i => i.Address.AddressFamily == AddressFamily.InterNetwork)?.First()?.IPv4Mask;
if (properties.GatewayAddresses.Count > 0)
{
na.PrimaryGateway = null;
foreach (GatewayIPAddressInformation gatewayInfo in properties.GatewayAddresses)
{
if (gatewayInfo.Address != null && gatewayInfo.Address.AddressFamily == AddressFamily.InterNetwork)
{
na.PrimaryGateway = gatewayInfo.Address;
break;
}
}
}
else
{
//if the gateways on the Network adaptor properties is null, then get it from the routing table, especially the case for VPN routers
List <Ip4RouteEntry> routeTable = Ip4RouteTable.GetRouteTable();
if (routeTable.Where(i => i.InterfaceIndex == na.InterfaceIndex)?.Count() > 0)
{
na.PrimaryGateway = routeTable.Where(i => i.InterfaceIndex == na.InterfaceIndex)?.First()?.GatewayIP;
}
}
//not ideal and incorrect, but hopefully it doesn't execute this as the gateways are defined elsewhere
//the correct way is to locate the primary gateway in some other property other than the 3 methods here
if (na.PrimaryGateway == null && properties.DhcpServerAddresses.Count > 0)
{
na.PrimaryGateway = properties.DhcpServerAddresses.First();
}
break;
}
}
return(na);
}
