private static IPAddress[] GetLocalAddresses()
{
IPAddress[] local;
ArrayList collections = new ArrayList(16);
int total = 0;
SafeLocalFree buffer = null;
GetAdaptersAddressesFlags gaaFlags = GetAdaptersAddressesFlags.SkipAnycast | GetAdaptersAddressesFlags.SkipMulticast |
GetAdaptersAddressesFlags.SkipFriendlyName | GetAdaptersAddressesFlags.SkipDnsServer;
uint size = 0;
uint result = UnsafeNetInfoNativeMethods.GetAdaptersAddresses(AddressFamily.Unspecified, (uint)gaaFlags, IntPtr.Zero, SafeLocalFree.Zero, ref size);
while (result == IpHelperErrors.ErrorBufferOverflow)
{
try
{
buffer = SafeLocalFree.LocalAlloc((int)size);
result = UnsafeNetInfoNativeMethods.GetAdaptersAddresses(AddressFamily.Unspecified, (uint)gaaFlags, IntPtr.Zero, buffer, ref size);
if (result == IpHelperErrors.Success)
{
IntPtr nextAdapter = buffer.DangerousGetHandle();
while (nextAdapter != IntPtr.Zero)
{
IpAdapterAddresses adapterAddresses = (IpAdapterAddresses)Marshal.PtrToStructure(
nextAdapter, typeof(IpAdapterAddresses));
if (adapterAddresses.firstUnicastAddress != IntPtr.Zero)
{
UnicastIPAddressInformationCollection coll =
SystemUnicastIPAddressInformation.MarshalUnicastIpAddressInformationCollection(
adapterAddresses.firstUnicastAddress);
total += coll.Count;
collections.Add(coll);
}
nextAdapter = adapterAddresses.next;
}
}
}
finally
{
if (buffer != null)
{
buffer.Close();
}
buffer = null;
}
}
if (result != IpHelperErrors.Success && result != IpHelperErrors.ErrorNoData)
{
throw new NetworkInformationException((int)result);
}
local = new IPAddress[total];
uint i = 0;
foreach (UnicastIPAddressInformationCollection coll in collections)
{
foreach (IPAddressInformation info in coll)
{
local[i++] = info.Address;
}
}
return(local);
}
