public static IPv4Address GetRoutableInterface(IPv4Address routeTo)
{
IPv4Address ret = new IPv4Address();
UInt32 routeToBytes = routeTo.AddressAsUInt32();
foreach (NetworkInterface netif in NetworkInterface.GetAllNetworkInterfaces())
{
if (netif.OperationalStatus == OperationalStatus.Up)
{
IPInterfaceProperties ipProperties = netif.GetIPProperties();
foreach (UnicastIPAddressInformation addressInfo in ipProperties.UnicastAddresses)
{
if (addressInfo.Address.AddressFamily == AddressFamily.InterNetwork)
{
IPv4Address ifAddress = new IPv4Address(addressInfo.Address);
try
{
if (addressInfo.IPv4Mask != null)
{
byte[] maskBytes = addressInfo.IPv4Mask.GetAddressBytes();
if (BitConverter.IsLittleEndian)
{
Array.Reverse(maskBytes);
}
UInt32 ifaddressMask = BitConverter.ToUInt32(maskBytes, 0);
if ((routeToBytes & ifaddressMask) == (ifAddress.AddressAsUInt32() & ifaddressMask))
{
ret = ifAddress;
break;
}
}
}
catch (Exception)
{
/** Mono will except on the IPv4Mask property... just assign it this address */
ret = ifAddress;
Log.SysLogText(LogLevel.INFO, "GetRoutableInterface - assigning {0}", ifAddress);
}
}
}
}
}
return(ret);
}
