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authornectar <nectar@FreeBSD.org>2003-04-17 14:14:22 +0000
committernectar <nectar@FreeBSD.org>2003-04-17 14:14:22 +0000
commit1b1f6bb4f50d42bbbb1291be0c60741c12f8201a (patch)
tree72f30804c92fca1b7ff1088806b0e3f696dce64c /lib/libc/net/nsdispatch.c
parent7ec422366401f961c808e40fd6b4c95c955ea58f (diff)
downloadFreeBSD-src-1b1f6bb4f50d42bbbb1291be0c60741c12f8201a.zip
FreeBSD-src-1b1f6bb4f50d42bbbb1291be0c60741c12f8201a.tar.gz
= Implement name service switch modules (NSS modules). NSS modules
may be built into libc (`static NSS modules') or dynamically loaded via dlopen (`dynamic NSS modules'). Modules are loaded/initialized at configuration time (i.e. when nsdispatch is called and nsswitch.conf is read or re-read). = Make the nsdispatch(3) core thread-safe. = New status code for nsdispatch(3) `NS_RETURN', currently used to signal ERANGE-type issues. = syslog(3) problems, don't warn/err/abort. = Try harder to avoid namespace pollution. = Implement some shims to assist in porting NSS modules written for the GNU C Library nsswitch interface. Sponsored by: DARPA, Network Associates Laboratories
Diffstat (limited to 'lib/libc/net/nsdispatch.c')
-rw-r--r--lib/libc/net/nsdispatch.c584
1 files changed, 469 insertions, 115 deletions
diff --git a/lib/libc/net/nsdispatch.c b/lib/libc/net/nsdispatch.c
index b7c59ff..60a3eba 100644
--- a/lib/libc/net/nsdispatch.c
+++ b/lib/libc/net/nsdispatch.c
@@ -35,25 +35,75 @@
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
-
+/*-
+ * Copyright (c) 2003 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * Portions of this software were developed for the FreeBSD Project by
+ * Jacques A. Vidrine, Safeport Network Services, and Network
+ * Associates Laboratories, the Security Research Division of Network
+ * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
+ * ("CBOSS"), as part of the DARPA CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
-#include <sys/types.h>
+#include "namespace.h"
#include <sys/param.h>
#include <sys/stat.h>
-#include "namespace.h"
-#include <err.h>
+#include <dlfcn.h>
+#include <errno.h>
#include <fcntl.h>
#define _NS_PRIVATE
#include <nsswitch.h>
+#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <syslog.h>
#include <unistd.h>
#include "un-namespace.h"
+enum _nss_constants {
+ /* Number of elements allocated when we grow a vector */
+ ELEMSPERCHUNK = 8
+};
+
+/*
+ * Global NSS data structures are mostly read-only, but we update
+ * them when we read or re-read the nsswitch.conf.
+ */
+static pthread_rwlock_t nss_lock = PTHREAD_RWLOCK_INITIALIZER;
+
+/*
+ * Runtime determination of whether we are dynamically linked or not.
+ */
+extern int _DYNAMIC __attribute__ ((weak));
+#define is_dynamic() (&_DYNAMIC != NULL)
+
/*
* default sourcelist: `files'
*/
@@ -62,53 +112,178 @@ const ns_src __nsdefaultsrc[] = {
{ 0 },
};
-
-static int _nsmapsize = 0;
+/* Database, source mappings. */
+static unsigned int _nsmapsize;
static ns_dbt *_nsmap = NULL;
+/* NSS modules. */
+static unsigned int _nsmodsize;
+static ns_mod *_nsmod;
+
+/* Placeholder for builtin modules' dlopen `handle'. */
+static int __nss_builtin_handle;
+static void *nss_builtin_handle = &__nss_builtin_handle;
+
/*
- * size of dynamic array chunk for _nsmap and _nsmap[x].srclist
+ * Attempt to spew relatively uniform messages to syslog.
*/
-#define NSELEMSPERCHUNK 8
+#define nss_log(level, fmt, ...) \
+ syslog((level), "NSSWITCH(%s): " fmt, __func__, __VA_ARGS__)
+#define nss_log_simple(level, s) \
+ syslog((level), "NSSWITCH(%s): " s, __func__)
+/*
+ * Dynamically growable arrays are used for lists of databases, sources,
+ * and modules. The following `vector' interface is used to isolate the
+ * common operations.
+ */
+typedef int (*vector_comparison)(const void *, const void *);
+typedef void (*vector_free_elem)(void *);
+static void vector_sort(void *, unsigned int, size_t,
+ vector_comparison);
+static void vector_free(void **, unsigned int *, size_t,
+ vector_free_elem);
+static void *vector_ref(unsigned int, void *, unsigned int, size_t);
+static void *vector_search(const void *, void *, unsigned int, size_t,
+ vector_comparison);
+static int vector_append(const void *, void **, unsigned int *, size_t);
-int _nscmp(const void *, const void *);
+/*
+ * Internal interfaces.
+ */
+static int string_compare(const void *, const void *);
+static int mtab_compare(const void *, const void *);
+static int nss_configure(void);
+static void ns_dbt_free(ns_dbt *);
+static void ns_mod_free(ns_mod *);
+static void ns_src_free(ns_src **, int);
+static void nss_load_builtin_modules(void);
+static void nss_load_module(const char *, nss_module_register_fn);
+static void nss_atexit(void);
+/* nsparser */
+extern FILE *_nsyyin;
-int
-_nscmp(a, b)
- const void *a;
- const void *b;
+
+/*
+ * The vector operations
+ */
+static void
+vector_sort(void *vec, unsigned int count, size_t esize,
+ vector_comparison comparison)
{
- return (strcasecmp(((const ns_dbt *)a)->name,
- ((const ns_dbt *)b)->name));
+ qsort(vec, count, esize, comparison);
}
-void
-_nsdbtaddsrc(dbt, src)
- ns_dbt *dbt;
- const ns_src *src;
-{
- if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) {
- dbt->srclist = (ns_src *)realloc(dbt->srclist,
- (dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src));
- if (dbt->srclist == NULL)
- _err(1, "nsdispatch: memory allocation failure");
+static void *
+vector_search(const void *key, void *vec, unsigned int count, size_t esize,
+ vector_comparison comparison)
+{
+ return (bsearch(key, vec, count, esize, comparison));
+}
+
+
+static int
+vector_append(const void *elem, void **vec, unsigned int *count, size_t esize)
+{
+ void *p;
+
+ if ((*count % ELEMSPERCHUNK) == 0) {
+ p = realloc(*vec, (*count + ELEMSPERCHUNK) * esize);
+ if (p == NULL) {
+ nss_log_simple(LOG_ERR, "memory allocation failure");
+ return (0);
+ } else
+ *vec = p;
}
- memmove(&dbt->srclist[dbt->srclistsize++], src, sizeof(ns_src));
+ memmove((void *)(((uintptr_t)*vec) + (*count * esize)),
+ elem, esize);
+ (*count)++;
+ return (1);
+}
+
+
+static void *
+vector_ref(unsigned int i, void *vec, unsigned int count, size_t esize)
+{
+ if (i < count)
+ return (void *)((uintptr_t)vec + (i * esize));
+ else
+ return (NULL);
+}
+
+
+static void
+vector_free(void **vec, unsigned int *count, size_t esize,
+ vector_free_elem free_elem)
+{
+ unsigned int i;
+ void *elem;
+
+ for (i = 0; i < *count; i++) {
+ elem = vector_ref(i, *vec, *count, esize);
+ if (elem != NULL)
+ free_elem(elem);
+ }
+ free(*vec);
+ *vec = NULL;
+ *count = 0;
+}
+
+
+
+/*
+ * Comparison functions for vector_search.
+ */
+static int
+string_compare(const void *a, const void *b)
+{
+ return (strcasecmp(*(const char * const *)a, *(const char * const *)b));
+}
+
+
+static int
+mtab_compare(const void *a, const void *b)
+{
+ int cmp;
+
+ cmp = strcmp(((const ns_mtab *)a)->name, ((const ns_mtab *)b)->name);
+ if (cmp != 0)
+ return (cmp);
+ else
+ return (strcmp(((const ns_mtab *)a)->database,
+ ((const ns_mtab *)b)->database));
+}
+
+
+
+/*
+ * NSS nsmap management.
+ */
+void
+_nsdbtaddsrc(ns_dbt *dbt, const ns_src *src)
+{
+ const ns_mod *modp;
+
+ vector_append(src, (void **)&dbt->srclist, &dbt->srclistsize,
+ sizeof(*src));
+ modp = vector_search(&src->name, _nsmod, _nsmodsize, sizeof(*_nsmod),
+ string_compare);
+ if (modp == NULL)
+ nss_load_module(src->name, NULL);
}
+#ifdef _NSS_DEBUG
void
-_nsdbtdump(dbt)
- const ns_dbt *dbt;
+_nsdbtdump(const ns_dbt *dbt)
{
int i;
printf("%s (%d source%s):", dbt->name, dbt->srclistsize,
dbt->srclistsize == 1 ? "" : "s");
- for (i = 0; i < dbt->srclistsize; i++) {
+ for (i = 0; i < (int)dbt->srclistsize; i++) {
printf(" %s", dbt->srclist[i].name);
if (!(dbt->srclist[i].flags &
(NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) &&
@@ -127,103 +302,285 @@ _nsdbtdump(dbt)
}
printf("\n");
}
+#endif
-const ns_dbt *
-_nsdbtget(name)
- const char *name;
+/*
+ * The first time nsdispatch is called (during a process's lifetime,
+ * or after nsswitch.conf has been updated), nss_configure will
+ * prepare global data needed by NSS.
+ */
+static int
+nss_configure(void)
{
- static time_t confmod;
-
+ static pthread_mutex_t conf_lock = PTHREAD_MUTEX_INITIALIZER;
+ static time_t confmod;
struct stat statbuf;
- ns_dbt dbt;
-
- extern FILE *_nsyyin;
- extern int _nsyyparse(void);
-
- dbt.name = name;
-
- if (confmod) {
- if (stat(_PATH_NS_CONF, &statbuf) == -1)
- return (NULL);
- if (confmod < statbuf.st_mtime) {
- int i, j;
-
- for (i = 0; i < _nsmapsize; i++) {
- for (j = 0; j < _nsmap[i].srclistsize; j++) {
- if (_nsmap[i].srclist[j].name != NULL) {
- /*LINTED const cast*/
- free((void *)
- _nsmap[i].srclist[j].name);
- }
- }
- if (_nsmap[i].srclist)
- free(_nsmap[i].srclist);
- if (_nsmap[i].name) {
- /*LINTED const cast*/
- free((void *)_nsmap[i].name);
- }
- }
- if (_nsmap)
- free(_nsmap);
- _nsmap = NULL;
- _nsmapsize = 0;
- confmod = 0;
- }
- }
- if (!confmod) {
- if (stat(_PATH_NS_CONF, &statbuf) == -1)
- return (NULL);
- _nsyyin = fopen(_PATH_NS_CONF, "r");
- if (_nsyyin == NULL)
- return (NULL);
- _nsyyparse();
- (void)fclose(_nsyyin);
- qsort(_nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), _nscmp);
- confmod = statbuf.st_mtime;
- }
- return (bsearch(&dbt, _nsmap, (size_t)_nsmapsize, sizeof(ns_dbt),
- _nscmp));
+ int result;
+ const char *path;
+
+#if defined(_NSS_DEBUG) && defined(_NSS_SHOOT_FOOT)
+ /* NOTE WELL: THIS IS A SECURITY HOLE. This must only be built
+ * for debugging purposes and MUST NEVER be used in production.
+ */
+ path = getenv("NSSWITCH_CONF");
+ if (path == NULL)
+#endif
+ path = _PATH_NS_CONF;
+ if (stat(path, &statbuf) != 0)
+ return (0);
+ if (statbuf.st_mtime <= confmod)
+ return (0);
+ result = _pthread_mutex_trylock(&conf_lock);
+ if (result != 0)
+ return (0);
+ (void)_pthread_rwlock_unlock(&nss_lock);
+ result = _pthread_rwlock_wrlock(&nss_lock);
+ if (result != 0)
+ goto fin2;
+ _nsyyin = fopen(path, "r");
+ if (_nsyyin == NULL)
+ goto fin;
+ vector_free((void **)&_nsmap, &_nsmapsize, sizeof(*_nsmap),
+ (vector_free_elem)ns_dbt_free);
+ vector_free((void **)&_nsmod, &_nsmodsize, sizeof(*_nsmod),
+ (vector_free_elem)ns_mod_free);
+ nss_load_builtin_modules();
+ _nsyyparse();
+ (void)fclose(_nsyyin);
+ vector_sort(_nsmap, _nsmapsize, sizeof(*_nsmap), string_compare);
+ if (confmod == 0)
+ (void)atexit(nss_atexit);
+ confmod = statbuf.st_mtime;
+fin:
+ (void)_pthread_rwlock_unlock(&nss_lock);
+ result = _pthread_rwlock_rdlock(&nss_lock);
+fin2:
+ (void)_pthread_mutex_unlock(&conf_lock);
+ return (result);
}
void
-_nsdbtput(dbt)
- const ns_dbt *dbt;
+_nsdbtput(const ns_dbt *dbt)
{
- int i;
+ unsigned int i;
+ ns_dbt *p;
for (i = 0; i < _nsmapsize; i++) {
- if (_nscmp(dbt, &_nsmap[i]) == 0) {
- /* overwrite existing entry */
- if (_nsmap[i].srclist != NULL)
- free(_nsmap[i].srclist);
- memmove(&_nsmap[i], dbt, sizeof(ns_dbt));
+ p = vector_ref(i, _nsmap, _nsmapsize, sizeof(*_nsmap));
+ if (string_compare(&dbt->name, &p->name) == 0) {
+ /* overwrite existing entry */
+ if (p->srclist != NULL)
+ ns_src_free(&p->srclist, p->srclistsize);
+ memmove(p, dbt, sizeof(*dbt));
return;
}
}
+ vector_append(dbt, (void **)&_nsmap, &_nsmapsize, sizeof(*_nsmap));
+}
+
+
+static void
+ns_dbt_free(ns_dbt *dbt)
+{
+ ns_src_free(&dbt->srclist, dbt->srclistsize);
+}
- if ((_nsmapsize % NSELEMSPERCHUNK) == 0) {
- _nsmap = (ns_dbt *)realloc(_nsmap,
- (_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt));
- if (_nsmap == NULL)
- _err(1, "nsdispatch: memory allocation failure");
+
+static void
+ns_src_free(ns_src **src, int srclistsize)
+{
+ int i;
+
+ for (i = 0; i < srclistsize; i++)
+ if ((*src)[i].name != NULL)
+ /* This one was allocated by nslexer. You'll just
+ * have to trust me.
+ */
+ free((void *)((*src)[i].name));
+ free(*src);
+ *src = NULL;
+}
+
+
+
+/*
+ * NSS module management.
+ */
+/* The built-in NSS modules are all loaded at once. */
+#define NSS_BACKEND(name, reg) \
+ns_mtab *reg(unsigned int *, nss_module_unregister_fn *);
+#include "nss_backends.h"
+#undef NSS_BACKEND
+
+static void
+nss_load_builtin_modules(void)
+{
+#define NSS_BACKEND(name, reg) nss_load_module(#name, reg);
+#include "nss_backends.h"
+#undef NSS_BACKEND
+}
+
+
+/* Load a built-in or dynamically linked module. If the `reg_fn'
+ * argument is non-NULL, assume a built-in module and use reg_fn to
+ * register it. Otherwise, search for a dynamic NSS module.
+ */
+static void
+nss_load_module(const char *source, nss_module_register_fn reg_fn)
+{
+ char buf[PATH_MAX];
+ ns_mod mod;
+ nss_module_register_fn fn;
+
+ memset(&mod, 0, sizeof(mod));
+ mod.name = strdup(source);
+ if (mod.name == NULL) {
+ nss_log_simple(LOG_ERR, "memory allocation failure");
+ return;
}
- memmove(&_nsmap[_nsmapsize++], dbt, sizeof(ns_dbt));
+ if (reg_fn != NULL) {
+ /* The placeholder is required, as a NULL handle
+ * represents an invalid module.
+ */
+ mod.handle = nss_builtin_handle;
+ fn = reg_fn;
+ } else if (!is_dynamic())
+ goto fin;
+ else {
+ if (snprintf(buf, sizeof(buf), "nss_%s.so.%d", mod.name,
+ NSS_MODULE_INTERFACE_VERSION) >= (int)sizeof(buf))
+ goto fin;
+ mod.handle = dlopen(buf, RTLD_LOCAL|RTLD_LAZY);
+ if (mod.handle == NULL) {
+#ifdef _NSS_DEBUG
+ /* This gets pretty annoying since the built-in
+ * sources aren't modules yet.
+ */
+ nss_log(LOG_DEBUG, "%s, %s", mod.name, dlerror());
+#endif
+ goto fin;
+ }
+ fn = (nss_module_register_fn)dlfunc(mod.handle,
+ "nss_module_register");
+ if (fn == NULL) {
+ (void)dlclose(mod.handle);
+ mod.handle = NULL;
+ nss_log(LOG_ERR, "%s, %s", mod.name, dlerror());
+ goto fin;
+ }
+ }
+ mod.mtab = fn(mod.name, &mod.mtabsize, &mod.unregister);
+ if (mod.mtab == NULL || mod.mtabsize == 0) {
+ if (mod.handle != nss_builtin_handle)
+ (void)dlclose(mod.handle);
+ mod.handle = NULL;
+ nss_log(LOG_ERR, "%s, registration failed", mod.name);
+ goto fin;
+ }
+ if (mod.mtabsize > 1)
+ qsort(mod.mtab, mod.mtabsize, sizeof(mod.mtab[0]),
+ mtab_compare);
+fin:
+ vector_append(&mod, (void **)&_nsmod, &_nsmodsize, sizeof(*_nsmod));
+ vector_sort(_nsmod, _nsmodsize, sizeof(*_nsmod), string_compare);
+}
+
+
+
+static void
+ns_mod_free(ns_mod *mod)
+{
+
+ free(mod->name);
+ if (mod->handle == NULL)
+ return;
+ if (mod->unregister != NULL)
+ mod->unregister(mod->mtab, mod->mtabsize);
+ if (mod->handle != nss_builtin_handle)
+ (void)dlclose(mod->handle);
}
+
+/*
+ * Cleanup
+ */
+static void
+nss_atexit(void)
+{
+ (void)_pthread_rwlock_wrlock(&nss_lock);
+ vector_free((void **)&_nsmap, &_nsmapsize, sizeof(*_nsmap),
+ (vector_free_elem)ns_dbt_free);
+ vector_free((void **)&_nsmod, &_nsmodsize, sizeof(*_nsmod),
+ (vector_free_elem)ns_mod_free);
+ (void)_pthread_rwlock_unlock(&nss_lock);
+}
+
+
+
+/*
+ * Finally, the actual implementation.
+ */
+static nss_method
+nss_method_lookup(const char *source, const char *database,
+ const char *method, const ns_dtab disp_tab[], void **mdata)
+{
+ ns_mod *mod;
+ ns_mtab *match, key;
+ int i;
+
+ if (disp_tab != NULL)
+ for (i = 0; disp_tab[i].src != NULL; i++)
+ if (strcasecmp(source, disp_tab[i].src) == 0) {
+ *mdata = disp_tab[i].mdata;
+ return (disp_tab[i].method);
+ }
+ mod = vector_search(&source, _nsmod, _nsmodsize, sizeof(*_nsmod),
+ string_compare);
+ if (mod != NULL && mod->handle != NULL) {
+ key.database = database;
+ key.name = method;
+ match = bsearch(&key, mod->mtab, mod->mtabsize,
+ sizeof(mod->mtab[0]), mtab_compare);
+ if (match != NULL) {
+ *mdata = match->mdata;
+ return (match->method);
+ }
+ }
+ nss_log(LOG_DEBUG, "%s, %s, %s, not found", source, database, method);
+ *mdata = NULL;
+ return (NULL);
+}
+
+
+__weak_reference(_nsdispatch, nsdispatch);
+
int
-nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
- const char *method, const ns_src defaults[], ...)
+_nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
+ const char *method_name, const ns_src defaults[], ...)
{
va_list ap;
- int i, curdisp, result;
const ns_dbt *dbt;
const ns_src *srclist;
- int srclistsize;
-
- dbt = _nsdbtget(database);
+ nss_method method;
+ void *mdata;
+ int serrno, i, result, srclistsize;
+
+ serrno = errno;
+ result = _pthread_rwlock_rdlock(&nss_lock);
+ if (result != 0) {
+ result = NS_UNAVAIL;
+ goto fin;
+ }
+ result = nss_configure();
+ if (result != 0) {
+ result = NS_UNAVAIL;
+ goto fin;
+ }
+ dbt = vector_search(&database, _nsmap, _nsmapsize, sizeof(*_nsmap),
+ string_compare);
if (dbt != NULL) {
srclist = dbt->srclist;
srclistsize = dbt->srclistsize;
@@ -233,23 +590,20 @@ nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
while (srclist[srclistsize].name != NULL)
srclistsize++;
}
- result = 0;
-
for (i = 0; i < srclistsize; i++) {
- for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++)
- if (strcasecmp(disp_tab[curdisp].src,
- srclist[i].name) == 0)
- break;
- result = 0;
- if (disp_tab[curdisp].callback) {
+ result = NS_NOTFOUND;
+ method = nss_method_lookup(srclist[i].name, database,
+ method_name, disp_tab, &mdata);
+ if (method != NULL) {
va_start(ap, defaults);
- result = disp_tab[curdisp].callback(retval,
- disp_tab[curdisp].cb_data, ap);
+ result = method(retval, mdata, ap);
va_end(ap);
- if (result & srclist[i].flags) {
+ if (result & (srclist[i].flags))
break;
- }
}
}
- return (result ? result : NS_NOTFOUND);
+ (void)_pthread_rwlock_unlock(&nss_lock);
+fin:
+ errno = serrno;
+ return (result);
}
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