diff options
Diffstat (limited to 'inet/getnetgrent_r.c')
| -rw-r--r-- | inet/getnetgrent_r.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/inet/getnetgrent_r.c b/inet/getnetgrent_r.c new file mode 100644 index 0000000..52a90d0 --- /dev/null +++ b/inet/getnetgrent_r.c @@ -0,0 +1,218 @@ +/* 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; +} |