On Tue, 3 Aug 1999, Oscar Bonilla wrote:
>
> Following on the NSS (Name Service Switch):
>
> *Step One: I ported the NetBSD implementation of nsdispatch(3) as implemented
> by Luke Mewburn. See attached patch to libc and new header file. I'm also
> attaching the man page for /etc/nsswitch.conf. Right now it compiles,
> installs, and works for some simple tests I've run.
Great. I haven't alnalyse all of the code but this thing looks
a little bit limited:
> /* Basically we reduce getpwent to a simple nsdispatch call */
>
> struct passwd *
> getpwent()
> {
> int r;
> static const ns_dtab dtab[] = {
> NS_FILES_CB(_local_getpw, NULL)
> NS_DNS_CB(_dns_getpw, NULL)
> NS_NIS_CB(_nis_getpw, NULL)
> NS_COMPAT_CB(_compat_getpwent, NULL)
> { 0 }
> };
May be I'm totally wrong, but dtab[] array can be constructed (or
extended) dynamically, based on configuration file and _*_getpw()
functions can be placed in shared libraries (just like PAM modules). In
this case it is possible to extend NSS space without disturbing libc code.
--
Boris Popov
http://www.butya.kz/~bp/
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