[jcifs] midlc parse error

Robert Doerr samba at robertdoerr.de
Wed Sep 14 11:31:09 MDT 2011

13.09.2011 18:53, Michael B Allen:
> On Sun, Sep 11, 2011 at 3:00 AM, Robert Doerr<samba at robertdoerr.de>  wrote:
>> Hello,
>> I get some parse error when trying to compile the idl for the net
>> shutdown command and am not sure if I did right.
>> Here are my steps so far:
>> - compiled midlc under cygwin
>> - extracted three IDL-Files from [MS-RSP].pdf (download from microsoft):
>> initshutdown.idl, windowsshutdown.idl winreg.idl
>> - executed ./midlc<filename>    for all three files
>> For each file I get a parse failure from midlc for line 4. This line
>> looks like (example from windowsshutdown.idl):
>>   [size_is(MaximumLength / 2), length_is((Length) / 2) ] unsigned short*
>> Buffer;
>> The corresponding lines in the other files look similar.
>> midlc stops in parse.c on line 69 with the message "invalid attribute".
>> What am I doing wrong?
> Hi Robert,
> Midlc only supports a subset of Microsoft IDL so copying and pasting
> from Microsoft literature is almost certainly not going to work. You
> will need to narrow down and isolate things a little. However in this
> particular case I know for a fact midlc can handle that input. That
> whole line is actually part of the definition for UNICODE_STRING which
> is very common in JCIFS RPCs compiled with midlc. Look at
> src/jcifs/dcerpc/rpc.idl and you will see a definition for
> unicode_string with the same IDL in it.  Try copying that typedef and
> replace the corresponding chunk of IDL with that unicode_string
> definition. Study the various idl included with JCIFS in
> src/jcifs/dcerpc/msrpc/*.idl to get a better idea of what midlc wants.
> With a little work you should be able to get it to work no problem.
> Mike
Hi Michael,

thanks for pushing me in the right direction! After looking at the files 
you mentioned it was clear what's going on.
Unfortuately the WindowsShutdown interface (the one I actually need) 
uses RPC over TCP/IP transport (ncacn_ip_tcp).
Below the reworked windowsshutdown.idl which compiles correctly (with 
rpc.idl in the same directory) for further reference.



pointer_default( unique ),
interface WindowsShutdown {
     import "rpc.idl";
     unsigned long WsdrInitiateShutdown(
         [ in ] policy_handle Binding,
         [ in, unique ] unicode_string lpMessage,
         [ in ] unsigned long dwGracePeriod,
         [ in ] unsigned long dwShudownFlags,
         [ in ] unsigned long dwReason,
         [ in, unique ] unicode_string lpClientHint
     unsigned long WsdrAbortShutdown(
         [ in ] policy_handle Binding,
         [ in, unique ] unicode_string lpClientHint

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