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-rw-r--r--inet/getnetgrent_r.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/inet/getnetgrent_r.c b/inet/getnetgrent_r.c
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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;
+}