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/* Copyright (C) 1996-2024 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/>. */
#include <errno.h>
#include <libc-lock.h>
#include "nsswitch.h"
/*******************************************************************\
|* Here we assume several symbols to be defined: *|
|* *|
|* LOOKUP_TYPE - the return type of the function *|
|* *|
|* SETFUNC_NAME - name of the non-reentrant setXXXent function *|
|* *|
|* GETFUNC_NAME - name of the non-reentrant getXXXent function *|
|* *|
|* ENDFUNC_NAME - name of the non-reentrant endXXXent function *|
|* *|
|* DATABASE_NAME - name of the database the function accesses *|
|* (e.g., host, services, ...) *|
|* *|
|* Optionally the following vars can be defined: *|
|* *|
|* STAYOPEN - variable declaration for setXXXent function *|
|* *|
|* STAYOPEN_VAR - variable name for setXXXent function *|
|* *|
|* NEED_H_ERRNO - an extra parameter will be passed to point to *|
|* the global `h_errno' variable. *|
|* *|
\*******************************************************************/
/* To make the real sources a bit prettier. */
#define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME)
#define APPEND_R(Name) CONCAT2_2 (Name, _r)
#define INTERNAL(Name) CONCAT2_2 (__, Name)
#define CONCAT2_1(Pre, Post) CONCAT2_2 (Pre, Post)
#define CONCAT2_2(Pre, Post) Pre##Post
#define NEW(name) NEW1 (name)
#define NEW1(name) __new_##name
#define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME)
#define GETFUNC_NAME_STRING STRINGIZE (REENTRANT_GETNAME)
#define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME)
#define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME)
#define STRINGIZE(Name) STRINGIZE1 (Name)
#define STRINGIZE1(Name) #Name
#ifndef DB_LOOKUP_FCT
# define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2)
# define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
# define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
#endif
/* Sometimes we need to store error codes in the `h_errno' variable. */
#ifdef NEED_H_ERRNO
# define H_ERRNO_PARM , int *h_errnop
# define H_ERRNO_VAR , &h_errno
# define H_ERRNO_VAR_P &h_errno
#else
# define H_ERRNO_PARM
# define H_ERRNO_VAR
# define H_ERRNO_VAR_P NULL
#endif
/* Some databases take the `stayopen' flag. */
#ifdef STAYOPEN
# define STAYOPEN_TMP CONCAT2_1 (STAYOPEN, _tmp)
# define STAYOPEN_TMPVAR &CONCAT2_1 (STAYOPEN_VAR, _tmp)
#else
# define STAYOPEN void
# define STAYOPEN_VAR 0
# define STAYOPEN_TMPVAR NULL
#endif
#ifndef NEED__RES
# define NEED__RES 0
#endif
/* This handle for the NSS data base is shared between all
set/get/endXXXent functions. */
static nss_action_list nip;
/* Remember the last service used since the last call to `endXXent'. */
static nss_action_list last_nip;
/* Remember the first service_entry across set/get/endent. */
static nss_action_list startp;
#ifdef STAYOPEN_TMP
/* We need to remember the last `stayopen' flag given by the user
since the `setent' function is only called for the first available
service. */
static STAYOPEN_TMP;
#endif
/* Protect above variable against multiple uses at the same time. */
__libc_lock_define_initialized (static, lock)
/* The lookup function for the first entry of this service. */
extern int DB_LOOKUP_FCT (nss_action_list *nip, const char *name,
const char *name2, void **fctp);
libc_hidden_proto (DB_LOOKUP_FCT)
void
SETFUNC_NAME (STAYOPEN)
{
int save;
__libc_lock_lock (lock);
__nss_setent (SETFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp,
&last_nip, STAYOPEN_VAR, STAYOPEN_TMPVAR, NEED__RES);
save = errno;
__libc_lock_unlock (lock);
__set_errno (save);
}
void
ENDFUNC_NAME (void)
{
int save;
/* If the service has not been used before do not do anything. */
if (startp != NULL)
{
__libc_lock_lock (lock);
__nss_endent (ENDFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp,
&last_nip, NEED__RES);
save = errno;
__libc_lock_unlock (lock);
__set_errno (save);
}
}
int
INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen,
LOOKUP_TYPE **result H_ERRNO_PARM)
{
int status;
int save;
__libc_lock_lock (lock);
status = __nss_getent_r (GETFUNC_NAME_STRING, SETFUNC_NAME_STRING,
DB_LOOKUP_FCT, &nip, &startp, &last_nip,
STAYOPEN_TMPVAR, NEED__RES, resbuf, buffer,
buflen, (void **) result, H_ERRNO_VAR_P);
save = errno;
__libc_lock_unlock (lock);
__set_errno (save);
return status;
}
#ifdef NO_COMPAT_NEEDED
strong_alias (INTERNAL (REENTRANT_GETNAME), REENTRANT_GETNAME);
#else
# include <shlib-compat.h>
# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2)
# define OLD(name) OLD1 (name)
# define OLD1(name) __old_##name
int
attribute_compat_text_section
OLD (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen,
LOOKUP_TYPE **result H_ERRNO_PARM)
{
int ret = INTERNAL (REENTRANT_GETNAME) (resbuf, buffer, buflen,
result H_ERRNO_VAR);
if (ret != 0)
ret = -1;
return ret;
}
# define do_symbol_version(real, name, version) \
compat_symbol (libc, real, name, version)
do_symbol_version (OLD (REENTRANT_GETNAME), REENTRANT_GETNAME, GLIBC_2_0);
# endif
/* As INTERNAL (REENTRANT_GETNAME) may be hidden, we need an alias
in between so that the REENTRANT_GETNAME@@GLIBC_2.1.2 is not
hidden too. */
strong_alias (INTERNAL (REENTRANT_GETNAME), NEW (REENTRANT_GETNAME));
# define do_default_symbol_version(real, name, version) \
versioned_symbol (libc, real, name, version)
do_default_symbol_version (NEW (REENTRANT_GETNAME),
REENTRANT_GETNAME, GLIBC_2_1_2);
#endif
nss_interface_function (SETFUNC_NAME)
nss_interface_function (ENDFUNC_NAME)
nss_interface_function (REENTRANT_GETNAME)
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