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92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/* GLIB - Library of useful routines for C programming
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*
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* Copyright (C) 2020 Red Hat, Inc.
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*
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* Author: Jakub Jelen <jjelen@redhat.com>
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This 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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*
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* This 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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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <dlfcn.h>
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#include <pwd.h>
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#include <sys/types.h>
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#include <unistd.h>
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#ifndef __APPLE__
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#define GET_REAL(func) \
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(real_##func = dlsym (RTLD_NEXT, #func))
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#define DEFINE_WRAPPER(return_type, func, argument_list) \
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static return_type (* real_##func) argument_list; \
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return_type func argument_list
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#else
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#define GET_REAL(func) \
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func
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/* https://opensource.apple.com/source/dyld/dyld-852.2/include/mach-o/dyld-interposing.h */
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#define DYLD_INTERPOSE(_replacement,_replacee) \
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__attribute__((used)) static struct{ const void* replacement; const void* replacee; } _interpose_##_replacee \
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__attribute__ ((section ("__DATA,__interpose"))) = { (const void*)(unsigned long)&_replacement, (const void*)(unsigned long)&_replacee };
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#define DEFINE_WRAPPER(return_type, func, argument_list) \
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static return_type wrap_##func argument_list; \
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DYLD_INTERPOSE(wrap_##func, func) \
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static return_type wrap_##func argument_list
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#endif /* __APPLE__ */
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/* This is used in gutils.c used to make sure utility functions
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* handling user information do not crash on bad data (for example
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* caused by getpwuid returning some NULL elements.
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*/
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#undef getpwuid
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static struct passwd my_pw;
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DEFINE_WRAPPER (struct passwd *, getpwuid, (uid_t uid))
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{
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struct passwd *pw = GET_REAL (getpwuid) (uid);
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my_pw = *pw;
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my_pw.pw_name = NULL;
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return &my_pw;
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}
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DEFINE_WRAPPER (int, getpwnam_r, (const char *name,
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struct passwd *pwd,
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char buf[],
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size_t buflen,
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struct passwd **result))
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{
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int code = GET_REAL (getpwnam_r) (name, pwd, buf, buflen, result);
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pwd->pw_name = NULL;
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return code;
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}
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DEFINE_WRAPPER (int, getpwuid_r, (uid_t uid,
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struct passwd *restrict pwd,
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char buf[],
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size_t buflen,
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struct passwd **result))
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{
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int code = GET_REAL (getpwuid_r) (uid, pwd, buf, buflen, result);
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pwd->pw_name = NULL;
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return code;
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}
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