Re: [evlog-dev] question on evl_register_facility

Yes, the libevl version of evl_register_facility() includes the "uid=root"
filter whether you want it or not.  I guess we decided that, for security
reasons, it would be best to default to a root-only facility.

There is a way around this.  evl_register_facility() calls
_evlAddFacilityToRegistry(fname, flags, filter), which forks and execs the
evlfacility command.  fname is the facility name, flags is bits like
EVL_FACC_PRIVATE and EVL_FACC_KERN (--private and --kernel), and filter is
the filter string, which may be NULL.  So you could call
_evlAddFacilityToRegistry directly, with a NULL filter, and then call
evl_gen_facility_code() to get the resulting facility code.

Note that neither evl_register_facility()  nor _evlAddFacilityToRegistry()
will succeed if the caller isn't root.

Jim Keniston
IBM LTC RAS


|---------+-------------------------------------------->
|         |           Steve Woodruff                   |
|         |           <[email protected]>              |
|         |           Sent by:                         |
|         |           [email protected]|
|         |           ceforge.net                      |
|         |                                            |
|         |                                            |
|         |           02/18/03 10:30 AM                |
|         |                                            |
|---------+-------------------------------------------->
  >--------------------------------------------------------------------------------------------------------------------------------------------------|
  |                                                                                                                                                  |
  |       To:       evlog mailing list <[email protected]>                                                                      |
  |       cc:                                                                                                                                        |
  |       Subject:  [evlog-dev] question on evl_register_facility                                                                                    |
  |                                                                                                                                                  |
  >--------------------------------------------------------------------------------------------------------------------------------------------------|




Hi,

Can someone comment on how to use the function
evl_register_facility() to register a facility
with no filter applied?  When I use this function
to register a facility, it always gets the
'uid=root' filter applied  (as shown by running
"evlfacility -l") and then non-root users can not
post events with that facility tag.

However, if i use the command line:
"/sbin/evlfacility -a abcd" then the facility is
added with no filter applied and any user can
post.  The prototype for evl_register_facility()
doesn't seem to have any flags for filters...
so how is this filter being added automatically?

Thanks!

/steve

--- Larry Kessler <[email protected]> wrote:
> On Monday 13 January 2003 10:57, Steve Woodruff
> wrote:
> > Hi,
> >
> > It doesn't seem that linuxEvlog.html has been
> > updated regarding the new "plug-in" capability
> > of evlog 1.5.0.  Is there any documentation
> > available (maybe in draft form) that I can have
> > a look at regarding this specific feature?  This
> > is mentioned in section 8 (HOWTO) but marked as
> > coming soon.
>
> Steve- Sorry but we've gotten behind on getting
> things posted to the
> website.  The attached tarball has a README with
> explanation and
> code with numerous comments implementing a sample
> driver.  Next
> step is to create a HOWTO for the website, but this
> should help.
>
> Please feel free to comment or post questions.
>
> Thanks,
> Larry Kessler
>
>

> ATTACHMENT part 2 application/x-tgz
name=sample_be_howto.tar.gz



=====
----------------------------------------------------------
 Steve Woodruff, N9OH @ 42.18N 88.34W, [email protected]

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