mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 22:30:07 +00:00
109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/* NSS actions, elements in a nsswitch.conf configuration line.
|
|
Copyright (c) 2020-2023 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _NSS_ACTION_H
|
|
#define _NSS_ACTION_H
|
|
|
|
#include <stddef.h>
|
|
|
|
/* See nss_database.h for a summary of how this relates. */
|
|
|
|
#include "nsswitch.h" /* For lookup_actions. */
|
|
|
|
struct nss_module;
|
|
|
|
/* A NSS action pairs a service module with the action for each result
|
|
state. */
|
|
struct nss_action
|
|
{
|
|
/* The service module that provides the functionality (potentially
|
|
not yet loaded). */
|
|
struct nss_module *module;
|
|
|
|
/* Action according to result. Two bits for each lookup_actions
|
|
value (from nsswitch.h), indexed by enum nss_status (from nss.h). */
|
|
unsigned int action_bits;
|
|
};
|
|
|
|
/* Value to add to first nss_status value to get zero. */
|
|
#define NSS_STATUS_BIAS 2
|
|
/* Number of bits per lookup action. */
|
|
#define NSS_BPL 2
|
|
#define NSS_BPL_MASK ((1 << NSS_BPL) - 1)
|
|
|
|
/* Index in actions of an NSS status. Note that in nss/nss.h the
|
|
status starts at -2, and we shift that up to zero by adding 2.
|
|
Thus for example NSS_STATUS_TRYAGAIN, which is -2, would index into
|
|
the 0th bit place as expected. */
|
|
static inline int
|
|
nss_actions_bits_index (enum nss_status status)
|
|
{
|
|
return NSS_BPL * (NSS_STATUS_BIAS + status);
|
|
}
|
|
|
|
/* Returns the lookup_action value for STATUS in ACTION. */
|
|
static inline lookup_actions
|
|
nss_action_get (const struct nss_action *action, enum nss_status status)
|
|
{
|
|
return ((action->action_bits >> nss_actions_bits_index (status))
|
|
& NSS_BPL_MASK);
|
|
}
|
|
|
|
/* Sets the lookup_action value for STATUS in ACTION. */
|
|
static inline void
|
|
nss_action_set (struct nss_action *action,
|
|
enum nss_status status, lookup_actions actions)
|
|
{
|
|
int offset = nss_actions_bits_index (status);
|
|
unsigned int mask = NSS_BPL_MASK << offset;
|
|
action->action_bits = ((action->action_bits & ~mask)
|
|
| ((unsigned int) actions << offset));
|
|
}
|
|
|
|
static inline void
|
|
nss_action_set_all (struct nss_action *action, lookup_actions actions)
|
|
{
|
|
unsigned int bits = actions & NSS_BPL_MASK;
|
|
action->action_bits = ( bits
|
|
| (bits << (NSS_BPL * 1))
|
|
| (bits << (NSS_BPL * 2))
|
|
| (bits << (NSS_BPL * 3))
|
|
| (bits << (NSS_BPL * 4))
|
|
);
|
|
}
|
|
|
|
/* A list of struct nss_action objects in array terminated by an
|
|
action with a NULL module. */
|
|
typedef struct nss_action *nss_action_list;
|
|
|
|
/* Returns a pointer to an allocated NSS action list that has COUNT
|
|
actions that matches the array at ACTIONS. */
|
|
nss_action_list __nss_action_allocate (struct nss_action *actions,
|
|
size_t count) attribute_hidden;
|
|
|
|
/* Returns a pointer to a list allocated by __nss_action_allocate, or
|
|
NULL on error. ENOMEM means a (temporary) memory allocation error,
|
|
EINVAL means that LINE is syntactically invalid. */
|
|
nss_action_list __nss_action_parse (const char *line);
|
|
|
|
/* Called from __libc_freeres. */
|
|
void __nss_action_freeres (void) attribute_hidden;
|
|
|
|
|
|
#endif /* _NSS_ACTION_H */
|