691 lines
17 KiB
C
691 lines
17 KiB
C
/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <nss.h>
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#include <nsswitch.h>
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#include <stdio_ext.h>
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#include <string.h>
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#include <libc-lock.h>
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#include <kernel-features.h>
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#include <nss_files.h>
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NSS_DECLARE_MODULE_FUNCTIONS (compat)
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static nss_action_list ni;
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static enum nss_status (*setgrent_impl) (int stayopen);
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static enum nss_status (*getgrnam_r_impl) (const char *name,
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struct group * grp, char *buffer,
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size_t buflen, int *errnop);
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static enum nss_status (*getgrgid_r_impl) (gid_t gid, struct group * grp,
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char *buffer, size_t buflen,
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int *errnop);
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static enum nss_status (*getgrent_r_impl) (struct group * grp, char *buffer,
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size_t buflen, int *errnop);
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static enum nss_status (*endgrent_impl) (void);
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/* Get the declaration of the parser function. */
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#define ENTNAME grent
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#define STRUCTURE group
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#define EXTERN_PARSER
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#include <nss/nss_files/files-parse.c>
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/* Structure for remembering -group members ... */
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#define BLACKLIST_INITIAL_SIZE 512
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#define BLACKLIST_INCREMENT 256
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struct blacklist_t
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{
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char *data;
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int current;
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int size;
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};
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struct ent_t
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{
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bool files;
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enum nss_status setent_status;
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FILE *stream;
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struct blacklist_t blacklist;
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};
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typedef struct ent_t ent_t;
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static ent_t ext_ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
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/* Protect global state against multiple changers. */
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__libc_lock_define_initialized (static, lock)
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/* Prototypes for local functions. */
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static void blacklist_store_name (const char *, ent_t *);
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static bool in_blacklist (const char *, int, ent_t *);
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/* Initialize the NSS interface/functions. The calling function must
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hold the lock. */
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static void
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init_nss_interface (void)
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{
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if (__nss_database_get (nss_database_group_compat, &ni))
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{
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setgrent_impl = __nss_lookup_function (ni, "setgrent");
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getgrnam_r_impl = __nss_lookup_function (ni, "getgrnam_r");
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getgrgid_r_impl = __nss_lookup_function (ni, "getgrgid_r");
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getgrent_r_impl = __nss_lookup_function (ni, "getgrent_r");
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endgrent_impl = __nss_lookup_function (ni, "endgrent");
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}
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}
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static enum nss_status
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internal_setgrent (ent_t *ent, int stayopen, int needent)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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ent->files = true;
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if (ent->blacklist.data != NULL)
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{
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ent->blacklist.current = 1;
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ent->blacklist.data[0] = '|';
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ent->blacklist.data[1] = '\0';
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}
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else
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ent->blacklist.current = 0;
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if (ent->stream == NULL)
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{
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ent->stream = __nss_files_fopen ("/etc/group");
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if (ent->stream == NULL)
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status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
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}
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else
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rewind (ent->stream);
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if (needent && status == NSS_STATUS_SUCCESS && setgrent_impl)
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ent->setent_status = setgrent_impl (stayopen);
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return status;
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}
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enum nss_status
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_nss_compat_setgrent (int stayopen)
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{
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enum nss_status result;
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__libc_lock_lock (lock);
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if (ni == NULL)
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init_nss_interface ();
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result = internal_setgrent (&ext_ent, stayopen, 1);
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__libc_lock_unlock (lock);
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return result;
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}
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static enum nss_status __attribute_warn_unused_result__
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internal_endgrent (ent_t *ent)
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{
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if (ent->stream != NULL)
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{
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fclose (ent->stream);
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ent->stream = NULL;
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}
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if (ent->blacklist.data != NULL)
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{
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ent->blacklist.current = 1;
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ent->blacklist.data[0] = '|';
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ent->blacklist.data[1] = '\0';
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}
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else
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ent->blacklist.current = 0;
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return NSS_STATUS_SUCCESS;
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}
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/* Like internal_endgrent, but preserve errno in all cases. */
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static void
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internal_endgrent_noerror (ent_t *ent)
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{
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int saved_errno = errno;
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enum nss_status unused __attribute__ ((unused)) = internal_endgrent (ent);
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__set_errno (saved_errno);
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}
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enum nss_status
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_nss_compat_endgrent (void)
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{
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enum nss_status result;
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__libc_lock_lock (lock);
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if (endgrent_impl)
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endgrent_impl ();
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result = internal_endgrent (&ext_ent);
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__libc_lock_unlock (lock);
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return result;
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}
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/* get the next group from NSS (+ entry) */
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static enum nss_status
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getgrent_next_nss (struct group *result, ent_t *ent, char *buffer,
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size_t buflen, int *errnop)
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{
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if (!getgrent_r_impl)
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return NSS_STATUS_UNAVAIL;
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/* If the setgrent call failed, say so. */
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if (ent->setent_status != NSS_STATUS_SUCCESS)
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return ent->setent_status;
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do
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{
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enum nss_status status;
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if ((status = getgrent_r_impl (result, buffer, buflen, errnop))
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!= NSS_STATUS_SUCCESS)
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return status;
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}
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while (in_blacklist (result->gr_name, strlen (result->gr_name), ent));
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return NSS_STATUS_SUCCESS;
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}
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/* This function handle the +group entrys in /etc/group */
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static enum nss_status
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getgrnam_plusgroup (const char *name, struct group *result, ent_t *ent,
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char *buffer, size_t buflen, int *errnop)
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{
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if (!getgrnam_r_impl)
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return NSS_STATUS_UNAVAIL;
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enum nss_status status = getgrnam_r_impl (name, result, buffer, buflen,
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errnop);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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if (in_blacklist (result->gr_name, strlen (result->gr_name), ent))
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return NSS_STATUS_NOTFOUND;
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/* We found the entry. */
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status
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getgrent_next_file (struct group *result, ent_t *ent,
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char *buffer, size_t buflen, int *errnop)
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{
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struct parser_data *data = (void *) buffer;
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while (1)
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{
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fpos_t pos;
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int parse_res = 0;
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char *p;
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do
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{
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/* We need at least 3 characters for one line. */
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if (__glibc_unlikely (buflen < 3))
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{
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erange:
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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fgetpos (ent->stream, &pos);
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buffer[buflen - 1] = '\xff';
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p = fgets_unlocked (buffer, buflen, ent->stream);
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if (p == NULL && feof_unlocked (ent->stream))
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return NSS_STATUS_NOTFOUND;
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if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
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{
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erange_reset:
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fsetpos (ent->stream, &pos);
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goto erange;
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}
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/* Terminate the line for any case. */
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buffer[buflen - 1] = '\0';
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/* Skip leading blanks. */
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while (isspace (*p))
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++p;
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}
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while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
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/* Parse the line. If it is invalid, loop to
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get the next line of the file to parse. */
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|| !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
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errnop)));
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if (__glibc_unlikely (parse_res == -1))
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/* The parser ran out of space. */
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goto erange_reset;
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if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
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/* This is a real entry. */
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break;
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/* -group */
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if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
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&& result->gr_name[1] != '@')
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{
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blacklist_store_name (&result->gr_name[1], ent);
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continue;
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}
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/* +group */
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if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
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&& result->gr_name[1] != '@')
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{
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size_t len = strlen (result->gr_name);
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char buf[len];
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enum nss_status status;
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/* Store the group in the blacklist for the "+" at the end of
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/etc/group */
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memcpy (buf, &result->gr_name[1], len);
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status = getgrnam_plusgroup (&result->gr_name[1], result, ent,
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buffer, buflen, errnop);
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blacklist_store_name (buf, ent);
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if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
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break;
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else if (status == NSS_STATUS_RETURN /* We couldn't parse the entry*/
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|| status == NSS_STATUS_NOTFOUND) /* No group in NIS */
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continue;
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else
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{
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if (status == NSS_STATUS_TRYAGAIN)
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/* The parser ran out of space. */
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goto erange_reset;
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return status;
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}
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}
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/* +:... */
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if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
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{
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ent->files = false;
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return getgrent_next_nss (result, ent, buffer, buflen, errnop);
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen,
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int *errnop)
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{
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enum nss_status result = NSS_STATUS_SUCCESS;
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__libc_lock_lock (lock);
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/* Be prepared that the setgrent function was not called before. */
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if (ni == NULL)
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init_nss_interface ();
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if (ext_ent.stream == NULL)
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result = internal_setgrent (&ext_ent, 1, 1);
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if (result == NSS_STATUS_SUCCESS)
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{
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if (ext_ent.files)
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result = getgrent_next_file (grp, &ext_ent, buffer, buflen, errnop);
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else
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result = getgrent_next_nss (grp, &ext_ent, buffer, buflen, errnop);
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}
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__libc_lock_unlock (lock);
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return result;
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}
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/* Searches in /etc/group and the NIS/NIS+ map for a special group */
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static enum nss_status
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internal_getgrnam_r (const char *name, struct group *result, ent_t *ent,
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char *buffer, size_t buflen, int *errnop)
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{
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struct parser_data *data = (void *) buffer;
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while (1)
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{
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fpos_t pos;
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int parse_res = 0;
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char *p;
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do
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{
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/* We need at least 3 characters for one line. */
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if (__glibc_unlikely (buflen < 3))
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{
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erange:
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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fgetpos (ent->stream, &pos);
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buffer[buflen - 1] = '\xff';
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p = fgets_unlocked (buffer, buflen, ent->stream);
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if (p == NULL && feof_unlocked (ent->stream))
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return NSS_STATUS_NOTFOUND;
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if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
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{
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erange_reset:
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fsetpos (ent->stream, &pos);
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goto erange;
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}
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/* Terminate the line for any case. */
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buffer[buflen - 1] = '\0';
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/* Skip leading blanks. */
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while (isspace (*p))
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++p;
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}
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while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
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/* Parse the line. If it is invalid, loop to
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get the next line of the file to parse. */
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|| !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
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errnop)));
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if (__glibc_unlikely (parse_res == -1))
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/* The parser ran out of space. */
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goto erange_reset;
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/* This is a real entry. */
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if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
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{
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if (strcmp (result->gr_name, name) == 0)
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return NSS_STATUS_SUCCESS;
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else
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continue;
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}
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/* -group */
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if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
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{
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if (strcmp (&result->gr_name[1], name) == 0)
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return NSS_STATUS_NOTFOUND;
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else
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continue;
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}
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/* +group */
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if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
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{
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if (strcmp (name, &result->gr_name[1]) == 0)
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{
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enum nss_status status;
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status = getgrnam_plusgroup (name, result, ent,
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buffer, buflen, errnop);
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if (status == NSS_STATUS_RETURN)
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/* We couldn't parse the entry */
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continue;
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else
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return status;
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}
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}
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/* +:... */
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if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
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{
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enum nss_status status;
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status = getgrnam_plusgroup (name, result, ent,
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buffer, buflen, errnop);
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if (status == NSS_STATUS_RETURN)
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/* We couldn't parse the entry */
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continue;
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else
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return status;
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_compat_getgrnam_r (const char *name, struct group *grp,
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char *buffer, size_t buflen, int *errnop)
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{
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ent_t ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
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enum nss_status result;
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if (name[0] == '-' || name[0] == '+')
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return NSS_STATUS_NOTFOUND;
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__libc_lock_lock (lock);
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if (ni == NULL)
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init_nss_interface ();
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__libc_lock_unlock (lock);
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result = internal_setgrent (&ent, 0, 0);
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if (result == NSS_STATUS_SUCCESS)
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result = internal_getgrnam_r (name, grp, &ent, buffer, buflen, errnop);
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internal_endgrent_noerror (&ent);
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return result;
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}
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/* Searches in /etc/group and the NIS/NIS+ map for a special group id */
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static enum nss_status
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internal_getgrgid_r (gid_t gid, struct group *result, ent_t *ent,
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char *buffer, size_t buflen, int *errnop)
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{
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struct parser_data *data = (void *) buffer;
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while (1)
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{
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fpos_t pos;
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int parse_res = 0;
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char *p;
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do
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{
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/* We need at least 3 characters for one line. */
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if (__glibc_unlikely (buflen < 3))
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{
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erange:
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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fgetpos (ent->stream, &pos);
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buffer[buflen - 1] = '\xff';
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p = fgets_unlocked (buffer, buflen, ent->stream);
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if (p == NULL && feof_unlocked (ent->stream))
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return NSS_STATUS_NOTFOUND;
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if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
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{
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erange_reset:
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fsetpos (ent->stream, &pos);
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goto erange;
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}
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/* Terminate the line for any case. */
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buffer[buflen - 1] = '\0';
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/* Skip leading blanks. */
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while (isspace (*p))
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++p;
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}
|
|
while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
|
|
/* Parse the line. If it is invalid, loop to
|
|
get the next line of the file to parse. */
|
|
|| !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
|
|
errnop)));
|
|
|
|
if (__glibc_unlikely (parse_res == -1))
|
|
/* The parser ran out of space. */
|
|
goto erange_reset;
|
|
|
|
/* This is a real entry. */
|
|
if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
|
|
{
|
|
if (result->gr_gid == gid)
|
|
return NSS_STATUS_SUCCESS;
|
|
else
|
|
continue;
|
|
}
|
|
|
|
/* -group */
|
|
if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
|
|
{
|
|
blacklist_store_name (&result->gr_name[1], ent);
|
|
continue;
|
|
}
|
|
|
|
/* +group */
|
|
if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
|
|
{
|
|
/* Yes, no +1, see the memcpy call below. */
|
|
size_t len = strlen (result->gr_name);
|
|
char buf[len];
|
|
enum nss_status status;
|
|
|
|
/* Store the group in the blacklist for the "+" at the end of
|
|
/etc/group */
|
|
memcpy (buf, &result->gr_name[1], len);
|
|
status = getgrnam_plusgroup (&result->gr_name[1], result, ent,
|
|
buffer, buflen, errnop);
|
|
blacklist_store_name (buf, ent);
|
|
if (status == NSS_STATUS_SUCCESS && result->gr_gid == gid)
|
|
break;
|
|
else
|
|
continue;
|
|
}
|
|
/* +:... */
|
|
if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
|
|
{
|
|
if (!getgrgid_r_impl)
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
enum nss_status status = getgrgid_r_impl (gid, result,
|
|
buffer, buflen, errnop);
|
|
if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */
|
|
return NSS_STATUS_NOTFOUND;
|
|
else
|
|
return status;
|
|
}
|
|
}
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
}
|
|
|
|
enum nss_status
|
|
_nss_compat_getgrgid_r (gid_t gid, struct group *grp,
|
|
char *buffer, size_t buflen, int *errnop)
|
|
{
|
|
ent_t ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
|
|
enum nss_status result;
|
|
|
|
__libc_lock_lock (lock);
|
|
|
|
if (ni == NULL)
|
|
init_nss_interface ();
|
|
|
|
__libc_lock_unlock (lock);
|
|
|
|
result = internal_setgrent (&ent, 0, 0);
|
|
|
|
if (result == NSS_STATUS_SUCCESS)
|
|
result = internal_getgrgid_r (gid, grp, &ent, buffer, buflen, errnop);
|
|
|
|
internal_endgrent_noerror (&ent);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Support routines for remembering -@netgroup and -user entries.
|
|
The names are stored in a single string with `|' as separator. */
|
|
static void
|
|
blacklist_store_name (const char *name, ent_t *ent)
|
|
{
|
|
int namelen = strlen (name);
|
|
char *tmp;
|
|
|
|
/* first call, setup cache */
|
|
if (ent->blacklist.size == 0)
|
|
{
|
|
ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
|
|
ent->blacklist.data = malloc (ent->blacklist.size);
|
|
if (ent->blacklist.data == NULL)
|
|
return;
|
|
ent->blacklist.data[0] = '|';
|
|
ent->blacklist.data[1] = '\0';
|
|
ent->blacklist.current = 1;
|
|
}
|
|
else
|
|
{
|
|
if (in_blacklist (name, namelen, ent))
|
|
return; /* no duplicates */
|
|
|
|
if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
|
|
{
|
|
ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
|
|
tmp = realloc (ent->blacklist.data, ent->blacklist.size);
|
|
if (tmp == NULL)
|
|
{
|
|
free (ent->blacklist.data);
|
|
ent->blacklist.size = 0;
|
|
return;
|
|
}
|
|
ent->blacklist.data = tmp;
|
|
}
|
|
}
|
|
|
|
tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
|
|
*tmp++ = '|';
|
|
*tmp = '\0';
|
|
ent->blacklist.current += namelen + 1;
|
|
|
|
return;
|
|
}
|
|
|
|
/* Return whether ent->blacklist contains name. */
|
|
static bool
|
|
in_blacklist (const char *name, int namelen, ent_t *ent)
|
|
{
|
|
char buf[namelen + 3];
|
|
char *cp;
|
|
|
|
if (ent->blacklist.data == NULL)
|
|
return false;
|
|
|
|
buf[0] = '|';
|
|
cp = stpcpy (&buf[1], name);
|
|
*cp++ = '|';
|
|
*cp = '\0';
|
|
return strstr (ent->blacklist.data, buf) != NULL;
|
|
}
|