internal static Owner GetOwningModuleUDP(MIB_UDPROW_OWNER_MODULE row)
{
Owner ret = null;
//if (ownerCache.TryGetValue(row, out ret))
//{
// return ret;
//}
IntPtr buffer = IntPtr.Zero;
try
{
uint buffSize = 0;
var retn = GetOwnerModuleFromUdpEntry(ref row, TCPIP_OWNER_MODULE_INFO_CLASS.TCPIP_OWNER_MODULE_INFO_BASIC, IntPtr.Zero, ref buffSize);
if ((retn != NO_ERROR) && (retn != ERROR_INSUFFICIENT_BUFFER))
{
//Cannot get owning module for this connection
LogHelper.Info("Unable to get the connection owner.");
return(ret);
}
if (buffSize == 0)
{
//No buffer? Probably means we can't retrieve any information about this connection; skip it
LogHelper.Info("Unable to get the connection owner.");
return(ret);
}
buffer = Marshal.AllocHGlobal((int)buffSize);
//GetOwnerModuleFromUdpEntry might want the fields of TCPIP_OWNER_MODULE_INFO_BASIC to be NULL
ZeroMemory(buffer, buffSize);
var resp = GetOwnerModuleFromUdpEntry(ref row, TCPIP_OWNER_MODULE_INFO_CLASS.TCPIP_OWNER_MODULE_INFO_BASIC, buffer, ref buffSize);
if (resp == 0)
{
ret = new Owner((TCPIP_OWNER_MODULE_BASIC_INFO)Marshal.PtrToStructure(buffer, typeof(TCPIP_OWNER_MODULE_BASIC_INFO)));
}
else if (resp != ERROR_NOT_FOUND) // Ignore closed connections
{
LogHelper.Error("Unable to get the connection owner.", new Win32Exception((int)resp));
}
//ownerCache.Add(row, ret);
return(ret);
}
finally
{
if (buffer != IntPtr.Zero)
{
Marshal.FreeHGlobal(buffer);
}
}
}
public static extern uint GetOwnerModuleFromUdpEntry(ref MIB_UDPROW_OWNER_MODULE pUdpEntry, TCPIP_OWNER_MODULE_INFO_CLASS Class, IntPtr Buffer, ref uint pdwSize);