internal static Owner?GetOwningModuleTCP(MIB_TCPROW_OWNER_MODULE row)
{
Owner?ret = null;
/*if (ownerCache.TryGetValue(row, out ret))
* {
* return ret;
* }*/
if (row.OwningPid == 0)
{
return(Owner.System);
}
IntPtr buffer = IntPtr.Zero;
try
{
uint buffSize = 0;
var retn = NativeMethods.GetOwnerModuleFromTcpEntry(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: ownerPid=" + row.OwningPid + " remoteAdr=" + row.RemoteAddress + ":" + row.RemotePort);
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 (no buffer).");
return(ret);
}
buffer = Marshal.AllocHGlobal((int)buffSize);
//GetOwnerModuleFromTcpEntry needs the fields of TCPIP_OWNER_MODULE_INFO_BASIC to be NULL
IPHelper.NativeMethods.ZeroMemory(buffer, buffSize);
var resp = NativeMethods.GetOwnerModuleFromTcpEntry(ref row, TCPIP_OWNER_MODULE_INFO_CLASS.TCPIP_OWNER_MODULE_INFO_BASIC, buffer, ref buffSize);
if (resp == 0)
{
ret = new Owner(Marshal.PtrToStructure <TCPIP_OWNER_MODULE_BASIC_INFO>(buffer));
}
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);
}
}
}
internal static extern uint GetOwnerModuleFromTcpEntry(ref MIB_TCPROW_OWNER_MODULE pTcpEntry, TCPIP_OWNER_MODULE_INFO_CLASS Class, IntPtr Buffer, ref uint pdwSize);
