[Samba] Re: Win32 services management?

Gerald (Jerry) Carter jerry at samba.org
Wed Apr 11 17:02:24 GMT 2007

Hash: SHA1

I'm moving this thread to the samba-technical list if anyone
wants to follow it there.

Danny Tylman wrote:

> I am facing some difficulties in implementing the parser function.
> Somehow - I keep getting a 'nca_s_fault_ndr' responses.
> I guess this is due invalid parsing of parameters. I am counting on the
> IDL specified here:
> http://websvn.samba.org/cgi-bin/viewcvs.cgi/branches/SAMBA_4_0/source/librpc/idl/svcctl.idl?rev=18639&view=markup
> And having couple of problems:
>   1.
>      svcctl_CreateServiceW defines [in,size_is(dependencies_size)] uint8
> *dependencies and [in] uint32 dependencies_size. Which are uint8 type -
> I think I can use a RPC_DATA_BLOB for that. This type appear in several
> places - including the username/pass combination for the service user.
> Looking at a Windows packet created with the CreateService() API, I can
> see the password is encrypted. I don't know how to resolve this issue.
>   2. I am trying to create a simple service, ignoring all the
>      complicated issues, that is: passing 'null' at all places I don't
>      have to implement. But yet - all I am getting is a 'nca_s_fault_ndr'.
>   3. Questions:
>         1. How much should I count on the Samba4 IDL? How is it
>            generated? I found no official documentation on that.
>         2. Looking at the SMB package data I see that the
>            'Policy_handle' part is larger (in size) than the Windows
>            counterpart, my function does the same as the others
>            regarding this handle, so I am just ignoring this issue. Is
>            it wise?
>         3. I don't quite understand if it matters to declare a pointer
>            in the code (UNISTR2 *str) and then use the prs_pointer()
>            function rather than declaring a variable (UNISTR2 str) and
>            using the smb_io_unistr2() function. I saw the latter do
>            some padding (prs_align()), but I keep getting gaps in my
>            packets which I can't explain - no matter which function I use.
> Regards, Danny.
> Gerald (Jerry) Carter wrote:
> dtylman at gmail.com wrote:
>>>> I am interested in implementing the 'createservice()' functionality
>>>> using the RPC protocol. I need this functionality badly, and I
>>>> understand it is not implemented.
>>>> I understand vaguely how this should be working and found some
>>>> documentation,
>>>> here: http://www.hsc.fr/ressources/articles/win_net_srv/
>>>> here:http://www.hsc.fr/ressources/articles/win_net_srv/
>>>> well_known_named_pipes.html
>>>> and here:
>>>> http://www.hsc.fr/ressources/articles/win_net_srv/msrpc_srvsvc.html.
> Also look at the svcctl.ild definition in SAMBA_4_0.
> http://websvn.samba.org/cgi-bin/viewcvs.cgi/branches/SAMBA_4_0/source/librpc/idl/svcctl.idl?rev=18639&view=markup
>>>> I guess the issue here is to use the same method used in the 'net'
>>>> command ('net.c' - util) and try to call
>>>> the rpc-client with just different parameter as
>>>> the above mentioned links state.
>>>> I don't have much experience in samba programming and I need to know:
>>>> (a) how complicate is that? should it be an easy task?
>>>> (b) I need some starting point.
>>>> (of course - if this is already implemented somewhere, i would be
>>>> glad to know!)
> It's not too hard.  Look at
> svn://svnanon.samba.org/samba/SAMBA_3_0/source/utils/net_rpc_service.c
> You'll need to do a few things.
> * Add request/reply  structures to include/rpc_svcctl.h
> * Add the parsing functions to rpc_parse/parse_svcctl
> * Add the client function to rpc_client/cli_svcctl.c
> * Add in the new command to net_rpc_service.c
> Start by looking at how the existing service management
> calls are implemented and then start adapting that to the
> new call.  All make sure you have a current release of
> wireshark to anaylze the traffic and make sure that
> parsing functions are doing the right thing.  Might even be
> good idea to get comfortable with the trafiic between
> two windows servers while playing with the Service Control
> MMC plugin.
> Hope this helps get you started.
> cheers, jerry
> =====================================================================
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