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