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/* Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <libc-lock.h>
#include <netdb.h>
#include "netgroup.h"
#include "nsswitch.h"
/* Protect above variable against multiple uses at the same time. */
__libc_lock_define_initialized (static, lock)
/* This handle for the NSS data base is shared between all
set/get/endXXXent functions. */
static service_user *nip;
/* Remember the first service_entry, it's always the same. */
static service_user *startp;
/* The lookup function for the first entry of this service. */
extern int __nss_netgroup_lookup (service_user **nip, const char *name,
void **fctp);
/* Set up NIP to run through the services. If ALL is zero, use NIP's
current location if it's not nil. Return nonzero if there are no
services (left). */
static enum nss_status
setup (void **fctp, const char *func_name, int all)
{
int no_more;
if (startp == NULL)
{
no_more = __nss_netgroup_lookup (&nip, func_name, fctp);
startp = no_more ? (service_user *) -1 : nip;
}
else if (startp == (service_user *) -1)
/* No services at all. */
return 1;
else
{
if (all || !nip)
/* Reset to the beginning of the service list. */
nip = startp;
/* Look up the first function. */
no_more = __nss_lookup (&nip, func_name, fctp);
}
return no_more;
}
int
setnetgrent (const char *group)
{
enum nss_status (*fct) (const char *);
enum nss_status status = NSS_STATUS_UNAVAIL;
int no_more;
__libc_lock_lock (lock);
/* Cycle through all the services and run their setnetgrent functions. */
no_more = setup ((void **) &fct, "setnetgrent", 1);
while (! no_more)
{
/* Ignore status, we force check in __NSS_NEXT. */
status = (*fct) (group);
no_more = __nss_next (&nip, "setnetgrent", (void **) &fct, status, 0);
}
__libc_lock_unlock (lock);
return status == NSS_STATUS_SUCCESS;
}
void
endnetgrent (void)
{
service_user *old_nip;
enum nss_status (*fct) (void);
int no_more;
__libc_lock_lock (lock);
/* Remember which was the last used service. */
old_nip = nip;
/* Cycle through all the services and run their setnetgrent functions. */
no_more = setup ((void **) &fct, "endnetgrent", 1);
while (! no_more)
{
/* Ignore status, we force check in __NSS_NEXT. */
(void) (*fct) ();
no_more = (nip == old_nip
|| __nss_next (&nip, "endnetgrent", (void **) &fct, 0, 1));
}
__libc_lock_unlock (lock);
}
int
__getnetgrent_r (char **hostp, char **userp, char **domainp,
char *buffer, int buflen)
{
enum nss_status (*fct) (struct __netgrent *, char *, int);
struct __netgrent result;
int no_more;
/* Initialize status to return if no more functions are found. */
enum nss_status status = NSS_STATUS_NOTFOUND;
__libc_lock_lock (lock);
/* Run through available functions, starting with the same function last
run. We will repeat each function as long as it succeeds, and then go
on to the next service action. */
no_more = setup ((void **) &fct, "getnetgrent_r", 0);
while (! no_more)
{
status = (*fct) (&result, buffer, buflen);
no_more = __nss_next (&nip, "getnetgrent_r", (void **) &fct, status, 0);
}
if (status == NSS_STATUS_SUCCESS)
{
*hostp = result.host;
*userp = result.user;
*domainp = result.domain;
}
__libc_lock_unlock (lock);
return status == NSS_STATUS_SUCCESS ? 1 : 0;
}
weak_alias (__getnetgrent_r, getnetgrent_r)
/* Test whether given (host,user,domain) triple is in NETGROUP. */
int
innetgr (const char *netgroup, const char *host, const char *user,
const char *domain)
{
int (*setfct) (const char *);
void (*endfct) (void);
int (*getfct) (struct __netgrent *, char *, int);
int result = 0;
int no_more;
__libc_lock_lock (lock);
/* Walk through the services until we found an answer or we shall
not work further. We can do some optimization here. Since all
services must provide the `setnetgrent' function we can do all
the work during one walk through the service list. */
no_more = setup ((void **) &setfct, "setnetgrent", 1);
while (! no_more)
{
enum nss_status status;
/* Open netgroup. */
status = (*setfct) (netgroup);
if (status == NSS_STATUS_SUCCESS
&& __nss_lookup (&nip, "getnetgrent_r", (void **) &getfct) == 0)
{
char buffer[1024];
struct __netgrent entry;
while ((*getfct) (&entry, buffer, sizeof buffer)
== NSS_STATUS_SUCCESS)
{
if ((entry.host == NULL || host == NULL
|| strcmp (entry.host, host) == 0)
&& (entry.user == NULL || user == NULL
|| strcmp (entry.user, user) == 0)
&& (entry.domain == NULL || domain == NULL
|| strcmp (entry.domain, domain) == 0))
{
result = 1;
break;
}
}
if (result != 0)
break;
/* If we found one service which does know the given
netgroup we don't try further. */
status = NSS_STATUS_RETURN;
}
/* Free all resources of the service. */
if (__nss_lookup (&nip, "endnetgrent", (void **) &endfct) == 0)
(*endfct) ();
/* Look for the next service. */
no_more = __nss_next (&nip, "setnetgrent", (void **) &setfct, status, 0);
}
__libc_lock_unlock (lock);
return result;
}
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