diff options
Diffstat (limited to 'inet/getnetgrent_r.c')
| -rw-r--r-- | inet/getnetgrent_r.c | 535 |
1 files changed, 0 insertions, 535 deletions
diff --git a/inet/getnetgrent_r.c b/inet/getnetgrent_r.c deleted file mode 100644 index 1b4eb65b89..0000000000 --- a/inet/getnetgrent_r.c +++ /dev/null @@ -1,535 +0,0 @@ -/* Copyright (C) 1996-2017 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 Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <assert.h> -#include <atomic.h> -#include <libc-lock.h> -#include <errno.h> -#include <netdb.h> -#include <stdbool.h> -#include <stdlib.h> -#include <string.h> -#include "netgroup.h" -#include "nsswitch.h" -#include <sysdep.h> -#include <nscd/nscd_proto.h> - - -/* Protect above variable against multiple uses at the same time. */ -__libc_lock_define_initialized (static, lock) - -/* The whole information for the set/get/endnetgrent functions are - kept in this structure. */ -static struct __netgrent dataset; - -/* The lookup function for the first entry of this service. */ -extern int __nss_netgroup_lookup (service_user **nipp, const char *name, - void **fctp) internal_function; - -/* Set up NIP to run through the services. Return nonzero if there are no - services (left). */ -static int -setup (void **fctp, service_user **nipp) -{ - /* Remember the first service_entry, it's always the same. */ - static bool startp_initialized; - static service_user *startp; - int no_more; - - if (!startp_initialized) - { - /* Executing this more than once at the same time must yield the - same result every time. So we need no locking. */ - no_more = __nss_netgroup_lookup (nipp, "setnetgrent", fctp); - startp = no_more ? (service_user *) -1 : *nipp; -#ifdef PTR_MANGLE - PTR_MANGLE (startp); -#endif - atomic_write_barrier (); - startp_initialized = true; - } - else - { - service_user *nip = startp; -#ifdef PTR_DEMANGLE - PTR_DEMANGLE (nip); -#endif - if (nip == (service_user *) -1) - /* No services at all. */ - return 1; - - /* Reset to the beginning of the service list. */ - *nipp = nip; - /* Look up the first function. */ - no_more = __nss_lookup (nipp, "setnetgrent", NULL, fctp); - } - return no_more; -} - -/* Free used memory. */ -static void -free_memory (struct __netgrent *data) -{ - while (data->known_groups != NULL) - { - struct name_list *tmp = data->known_groups; - data->known_groups = data->known_groups->next; - free (tmp); - } - - while (data->needed_groups != NULL) - { - struct name_list *tmp = data->needed_groups; - data->needed_groups = data->needed_groups->next; - free (tmp); - } -} - -static void -endnetgrent_hook (struct __netgrent *datap) -{ - enum nss_status (*endfct) (struct __netgrent *); - - if (datap->nip == NULL || datap->nip == (service_user *) -1l) - return; - - endfct = __nss_lookup_function (datap->nip, "endnetgrent"); - if (endfct != NULL) - (void) (*endfct) (datap); - datap->nip = NULL; -} - -static int -internal_function -__internal_setnetgrent_reuse (const char *group, struct __netgrent *datap, - int *errnop) -{ - union - { - enum nss_status (*f) (const char *, struct __netgrent *); - void *ptr; - } fct; - enum nss_status status = NSS_STATUS_UNAVAIL; - struct name_list *new_elem; - - /* Free data from previous service. */ - endnetgrent_hook (datap); - - /* Cycle through all the services and run their setnetgrent functions. */ - int no_more = setup (&fct.ptr, &datap->nip); - while (! no_more) - { - assert (datap->data == NULL); - - /* Ignore status, we force check in `__nss_next2'. */ - status = DL_CALL_FCT (*fct.f, (group, datap)); - - service_user *old_nip = datap->nip; - no_more = __nss_next2 (&datap->nip, "setnetgrent", NULL, &fct.ptr, - status, 0); - - if (status == NSS_STATUS_SUCCESS && ! no_more) - { - enum nss_status (*endfct) (struct __netgrent *); - - endfct = __nss_lookup_function (old_nip, "endnetgrent"); - if (endfct != NULL) - (void) DL_CALL_FCT (*endfct, (datap)); - } - } - - /* Add the current group to the list of known groups. */ - size_t group_len = strlen (group) + 1; - new_elem = (struct name_list *) malloc (sizeof (struct name_list) - + group_len); - if (new_elem == NULL) - { - *errnop = errno; - status = NSS_STATUS_TRYAGAIN; - } - else - { - new_elem->next = datap->known_groups; - memcpy (new_elem->name, group, group_len); - datap->known_groups = new_elem; - } - - return status == NSS_STATUS_SUCCESS; -} - -int -internal_function -__internal_setnetgrent (const char *group, struct __netgrent *datap) -{ - /* Free list of all netgroup names from last run. */ - free_memory (datap); - - return __internal_setnetgrent_reuse (group, datap, &errno); -} -libc_hidden_def (__internal_setnetgrent) - -static int -nscd_setnetgrent (const char *group) -{ -#ifdef USE_NSCD - if (__nss_not_use_nscd_netgroup > 0 - && ++__nss_not_use_nscd_netgroup > NSS_NSCD_RETRY) - __nss_not_use_nscd_netgroup = 0; - - if (!__nss_not_use_nscd_netgroup - && !__nss_database_custom[NSS_DBSIDX_netgroup]) - return __nscd_setnetgrent (group, &dataset); -#endif - return -1; -} - -int -setnetgrent (const char *group) -{ - int result; - - __libc_lock_lock (lock); - - result = nscd_setnetgrent (group); - if (result < 0) - result = __internal_setnetgrent (group, &dataset); - - __libc_lock_unlock (lock); - - return result; -} - -void -internal_function -__internal_endnetgrent (struct __netgrent *datap) -{ - endnetgrent_hook (datap); - /* Now free list of all netgroup names from last run. */ - free_memory (datap); -} -libc_hidden_def (__internal_endnetgrent) - - -void -endnetgrent (void) -{ - __libc_lock_lock (lock); - - __internal_endnetgrent (&dataset); - - __libc_lock_unlock (lock); -} - -#ifdef USE_NSCD -static const char * -get_nonempty_val (const char *in) -{ - if (*in == '\0') - return NULL; - return in; -} - -static enum nss_status -nscd_getnetgrent (struct __netgrent *datap, char *buffer, size_t buflen, - int *errnop) -{ - if (datap->cursor >= datap->data + datap->data_size) - return NSS_STATUS_UNAVAIL; - - datap->type = triple_val; - datap->val.triple.host = get_nonempty_val (datap->cursor); - datap->cursor = (char *) __rawmemchr (datap->cursor, '\0') + 1; - datap->val.triple.user = get_nonempty_val (datap->cursor); - datap->cursor = (char *) __rawmemchr (datap->cursor, '\0') + 1; - datap->val.triple.domain = get_nonempty_val (datap->cursor); - datap->cursor = (char *) __rawmemchr (datap->cursor, '\0') + 1; - - return NSS_STATUS_SUCCESS; -} -#endif - -int -internal_function -__internal_getnetgrent_r (char **hostp, char **userp, char **domainp, - struct __netgrent *datap, - char *buffer, size_t buflen, int *errnop) -{ - enum nss_status (*fct) (struct __netgrent *, char *, size_t, int *); - - /* Initialize status to return if no more functions are found. */ - enum nss_status status = NSS_STATUS_NOTFOUND; - - /* 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. */ - int no_more = datap->nip == NULL; - if (! no_more) - { -#ifdef USE_NSCD - /* This bogus function pointer is a special marker left by - __nscd_setnetgrent to tell us to use the data it left - before considering any modules. */ - if (datap->nip == (service_user *) -1l) - fct = nscd_getnetgrent; - else -#endif - { - fct = __nss_lookup_function (datap->nip, "getnetgrent_r"); - no_more = fct == NULL; - } - - while (! no_more) - { - status = DL_CALL_FCT (*fct, (datap, buffer, buflen, &errno)); - - if (status == NSS_STATUS_RETURN - /* The service returned a NOTFOUND, but there are more groups that - we need to resolve before we give up. */ - || (status == NSS_STATUS_NOTFOUND && datap->needed_groups != NULL)) - { - /* This was the last one for this group. Look at next group - if available. */ - int found = 0; - while (datap->needed_groups != NULL && ! found) - { - struct name_list *tmp = datap->needed_groups; - datap->needed_groups = datap->needed_groups->next; - tmp->next = datap->known_groups; - datap->known_groups = tmp; - - found = __internal_setnetgrent_reuse (datap->known_groups->name, - datap, errnop); - } - - if (found && datap->nip != NULL) - { - fct = __nss_lookup_function (datap->nip, "getnetgrent_r"); - if (fct != NULL) - continue; - } - } - else if (status == NSS_STATUS_SUCCESS && datap->type == group_val) - { - /* The last entry was a name of another netgroup. */ - struct name_list *namep; - - /* Ignore if we've seen the name before. */ - for (namep = datap->known_groups; namep != NULL; - namep = namep->next) - if (strcmp (datap->val.group, namep->name) == 0) - break; - if (namep == NULL) - for (namep = datap->needed_groups; namep != NULL; - namep = namep->next) - if (strcmp (datap->val.group, namep->name) == 0) - break; - if (namep != NULL) - /* Really ignore. */ - continue; - - size_t group_len = strlen (datap->val.group) + 1; - namep = (struct name_list *) malloc (sizeof (struct name_list) - + group_len); - if (namep == NULL) - /* We are out of memory. */ - status = NSS_STATUS_RETURN; - else - { - namep->next = datap->needed_groups; - memcpy (namep->name, datap->val.group, group_len); - datap->needed_groups = namep; - /* And get the next entry. */ - continue; - } - } - break; - } - } - - if (status == NSS_STATUS_SUCCESS) - { - *hostp = (char *) datap->val.triple.host; - *userp = (char *) datap->val.triple.user; - *domainp = (char *) datap->val.triple.domain; - } - - return status == NSS_STATUS_SUCCESS ? 1 : 0; -} -libc_hidden_def (__internal_getnetgrent_r) - -/* The real entry point. */ -int -__getnetgrent_r (char **hostp, char **userp, char **domainp, - char *buffer, size_t buflen) -{ - enum nss_status status; - - __libc_lock_lock (lock); - - status = __internal_getnetgrent_r (hostp, userp, domainp, &dataset, - buffer, buflen, &errno); - - __libc_lock_unlock (lock); - - return status; -} -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) -{ -#ifdef USE_NSCD - if (__nss_not_use_nscd_netgroup > 0 - && ++__nss_not_use_nscd_netgroup > NSS_NSCD_RETRY) - __nss_not_use_nscd_netgroup = 0; - - if (!__nss_not_use_nscd_netgroup - && !__nss_database_custom[NSS_DBSIDX_netgroup]) - { - int result = __nscd_innetgr (netgroup, host, user, domain); - if (result >= 0) - return result; - } -#endif - - union - { - enum nss_status (*f) (const char *, struct __netgrent *); - void *ptr; - } setfct; - void (*endfct) (struct __netgrent *); - int (*getfct) (struct __netgrent *, char *, size_t, int *); - struct __netgrent entry; - int result = 0; - const char *current_group = netgroup; - - memset (&entry, '\0', sizeof (entry)); - - /* 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. */ - while (1) - { - int no_more = setup (&setfct.ptr, &entry.nip); - while (! no_more) - { - assert (entry.data == NULL); - - /* Open netgroup. */ - enum nss_status status = DL_CALL_FCT (*setfct.f, - (current_group, &entry)); - - if (status == NSS_STATUS_SUCCESS - && (getfct = __nss_lookup_function (entry.nip, "getnetgrent_r")) - != NULL) - { - char buffer[1024]; - - while (DL_CALL_FCT (*getfct, - (&entry, buffer, sizeof buffer, &errno)) - == NSS_STATUS_SUCCESS) - { - if (entry.type == group_val) - { - /* Make sure we haven't seen the name before. */ - struct name_list *namep; - - for (namep = entry.known_groups; namep != NULL; - namep = namep->next) - if (strcmp (entry.val.group, namep->name) == 0) - break; - if (namep == NULL) - for (namep = entry.needed_groups; namep != NULL; - namep = namep->next) - if (strcmp (entry.val.group, namep->name) == 0) - break; - if (namep == NULL - && strcmp (netgroup, entry.val.group) != 0) - { - size_t group_len = strlen (entry.val.group) + 1; - namep = - (struct name_list *) malloc (sizeof (*namep) - + group_len); - if (namep == NULL) - { - /* Out of memory, simply return. */ - result = -1; - break; - } - - namep->next = entry.needed_groups; - memcpy (namep->name, entry.val.group, group_len); - entry.needed_groups = namep; - } - } - else - { - if ((entry.val.triple.host == NULL || host == NULL - || __strcasecmp (entry.val.triple.host, host) == 0) - && (entry.val.triple.user == NULL || user == NULL - || strcmp (entry.val.triple.user, user) == 0) - && (entry.val.triple.domain == NULL || domain == NULL - || __strcasecmp (entry.val.triple.domain, - domain) == 0)) - { - result = 1; - 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. */ - endfct = __nss_lookup_function (entry.nip, "endnetgrent"); - if (endfct != NULL) - DL_CALL_FCT (*endfct, (&entry)); - - if (result != 0) - break; - - /* Look for the next service. */ - no_more = __nss_next2 (&entry.nip, "setnetgrent", NULL, - &setfct.ptr, status, 0); - } - - if (result == 0 && entry.needed_groups != NULL) - { - struct name_list *tmp = entry.needed_groups; - entry.needed_groups = tmp->next; - tmp->next = entry.known_groups; - entry.known_groups = tmp; - current_group = tmp->name; - continue; - } - - /* No way out. */ - break; - } - - /* Free the memory. */ - free_memory (&entry); - - return result == 1; -} -libc_hidden_def (innetgr) |