diff options
Diffstat (limited to 'lib/euidaccess.c')
| -rw-r--r-- | lib/euidaccess.c | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/lib/euidaccess.c b/lib/euidaccess.c deleted file mode 100644 index 44c5a07bc..000000000 --- a/lib/euidaccess.c +++ /dev/null @@ -1,225 +0,0 @@ -/* euidaccess -- check if effective user id can access file - - Copyright (C) 1990, 1991, 1995, 1998, 2000, 2003, 2004, 2005 Free - Software Foundation, Inc. - - This file is part of the GNU C Library. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program 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 General Public License for more details. - - You should have received a copy of the GNU General Public License along - with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ - -/* Written by David MacKenzie and Torbjorn Granlund. - Adapted for GNU C library by Roland McGrath. */ - -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif - -#ifndef _LIBC -# include "euidaccess.h" -#endif - -#include <sys/types.h> -#include <sys/stat.h> -#include <unistd.h> - -#if HAVE_LIBGEN_H -# include <libgen.h> -#endif - -#include <errno.h> -#ifndef __set_errno -# define __set_errno(val) errno = (val) -#endif - -#if defined EACCES && !defined EACCESS -# define EACCESS EACCES -#endif - -#ifndef F_OK -# define F_OK 0 -# define X_OK 1 -# define W_OK 2 -# define R_OK 4 -#endif - - -#ifdef _LIBC - -# define access __access -# define getuid __getuid -# define getgid __getgid -# define geteuid __geteuid -# define getegid __getegid -# define group_member __group_member -# define euidaccess __euidaccess -# undef stat -# define stat stat64 - -#else - -# include "group-member.h" -# include "stat-macros.h" - -#endif - -/* Return 0 if the user has permission of type MODE on FILE; - otherwise, return -1 and set `errno'. - Like access, except that it uses the effective user and group - id's instead of the real ones, and it does not always check for read-only - file system, text busy, etc. */ - -int -euidaccess (const char *file, int mode) -{ -#if defined EFF_ONLY_OK - return access (file, mode | EFF_ONLY_OK); -#elif defined ACC_SELF - return accessx (file, mode, ACC_SELF); -#elif HAVE_EACCESS - return eaccess (file, mode); -#else - - uid_t uid = getuid (); - gid_t gid = getgid (); - uid_t euid = geteuid (); - gid_t egid = getegid (); - struct stat stats; - -# if HAVE_DECL_SETREGID && PREFER_NONREENTRANT_EUIDACCESS - - /* Define PREFER_NONREENTRANT_EUIDACCESS if you prefer euidaccess to - return the correct result even if this would make it - nonreentrant. Define this only if your entire application is - safe even if the uid or gid might temporarily change. If your - application uses signal handlers or threads it is probably not - safe. */ - - if (mode == F_OK) - return stat (file, &stats); - else - { - int result; - int saved_errno; - - if (uid != euid) - setreuid (euid, uid); - if (gid != egid) - setregid (egid, gid); - - result = access (file, mode); - saved_errno = errno; - - /* Restore them. */ - if (uid != euid) - setreuid (uid, euid); - if (gid != egid) - setregid (gid, egid); - - errno = saved_errno; - return result; - } - -# else - - /* The following code assumes the traditional Unix model, and is not - correct on systems that have ACLs or the like. However, it's - better than nothing, and it is reentrant. */ - - unsigned int granted; - if (uid == euid && gid == egid) - /* If we are not set-uid or set-gid, access does the same. */ - return access (file, mode); - - if (stat (file, &stats) != 0) - return -1; - - /* The super-user can read and write any file, and execute any file - that anyone can execute. */ - if (euid == 0 && ((mode & X_OK) == 0 - || (stats.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))) - return 0; - - /* Convert the mode to traditional form, clearing any bogus bits. */ - if (R_OK == 4 && W_OK == 2 && X_OK == 1 && F_OK == 0) - mode &= 7; - else - mode = ((mode & R_OK ? 4 : 0) - + (mode & W_OK ? 2 : 0) - + (mode & X_OK ? 1 : 0)); - - if (mode == 0) - return 0; /* The file exists. */ - - /* Convert the file's permission bits to traditional form. */ - if (S_IRUSR == (4 << 6) && S_IWUSR == (2 << 6) && S_IXUSR == (1 << 6) - && S_IRGRP == (4 << 3) && S_IWGRP == (2 << 3) && S_IXGRP == (1 << 3) - && S_IROTH == (4 << 0) && S_IWOTH == (2 << 0) && S_IXOTH == (1 << 0)) - granted = stats.st_mode; - else - granted = ((stats.st_mode & S_IRUSR ? 4 << 6 : 0) - + (stats.st_mode & S_IWUSR ? 2 << 6 : 0) - + (stats.st_mode & S_IXUSR ? 1 << 6 : 0) - + (stats.st_mode & S_IRGRP ? 4 << 3 : 0) - + (stats.st_mode & S_IWGRP ? 2 << 3 : 0) - + (stats.st_mode & S_IXGRP ? 1 << 3 : 0) - + (stats.st_mode & S_IROTH ? 4 << 0 : 0) - + (stats.st_mode & S_IWOTH ? 2 << 0 : 0) - + (stats.st_mode & S_IXOTH ? 1 << 0 : 0)); - - if (euid == stats.st_uid) - granted >>= 6; - else if (egid == stats.st_gid || group_member (stats.st_gid)) - granted >>= 3; - - if ((mode & ~granted) == 0) - return 0; - __set_errno (EACCESS); - return -1; - -# endif -#endif -} -#undef euidaccess -#ifdef weak_alias -weak_alias (__euidaccess, euidaccess) -#endif - -#ifdef TEST -# include <error.h> -# include <stdio.h> -# include <stdlib.h> - -char *program_name; - -int -main (int argc, char **argv) -{ - char *file; - int mode; - int err; - - program_name = argv[0]; - if (argc < 3) - abort (); - file = argv[1]; - mode = atoi (argv[2]); - - err = euidaccess (file, mode); - printf ("%d\n", err); - if (err != 0) - error (0, errno, "%s", file); - exit (0); -} -#endif |