Re: Need help with adding a new service to nsswitch.conf

[Pranjal Goswami <mechanic.p@gmail.com>]

I see. So we have an option of building my own NSS module outside the glibc
build system , referencing <nss.h> and using  NSS_DECLARE_MODULE_FUNCTIONS
(secmgr) to get to the  declarations for the plug-in functions. So it means
that for writing a new module, we need <nss.h> and
NSS_DECLARE_MODULE_FUNCTIONS (secmgr)  only. There are no other changes to
be done within the nss folder ?

Regards
Pranjal

On Wed, Jun 15, 2022 at 11:21 AM Florian Weimer <fweimer@redhat.com> wrote:

> * Pranjal Goswami via Libc-help:
>
> > Hi Friends ,
> > I am looking at adding another service in nsswitch.conf which can look
> for
> > user presence in a file other than /etc/password. I have copied the files
> > from nss_files  to a new folder and I  have made the changes in the
> > Makefile  under nss to get my module to build.. However I get an error
> when
> > I try  to build glibc.
> > /../include/libc-symbols.h:34:32: warning: "MODULE_libnss_secmgr" is not
> > defined, evaluates to 0 [-Wundef]
> >    34 | #define IN_MODULE  PASTE_NAME (MODULE_, MODULE_NAME)
> >       |                                ^~~~~~~
> > ./../include/libc-symbols.h:32:26: note: in definition of macro
> > 'PASTE_NAME1'
> >    32 | #define PASTE_NAME1(a,b) a##b
> >       |                          ^
> > ./../include/libc-symbols.h:34:20: note: in expansion of macro
> 'PASTE_NAME'
> >    34 | #define IN_MODULE  PASTE_NAME (MODULE_, MODULE_NAME)
> >
> > secmgr is the module that I am adding. I suspect that the problem is
> > related to the  line NSS_DECLARE_MODULE_FUNCTIONS (secmgr).
> > So if we are adding a new service under nss , what additional things we
> > need to do besides adding a module under nss and having teh same set of
> > files as in nss/files - renamed to the  new service that that  am using?
>
> Is there a reason why you need to build your NSS module under the glibc
> build system?  <nss.h> is an installed header file, and you can use
> NSS_DECLARE_MODULE_FUNCTIONS (secmgr) to get declarations for all the
> recognized plug-in functions.
>
> Thanks,
> Florian
>
>