source: MondoRescue/branches/stable/mindi-busybox/libbb/setup_environment.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <stdio.h>
32#include <errno.h>
33#include <unistd.h>
34#include <string.h>
35#include <stdlib.h>
36#include <syslog.h>
37#include <ctype.h>
38#include "libbb.h"
39
40
41
42#define DEFAULT_LOGIN_PATH      "/bin:/usr/bin"
43#define DEFAULT_ROOT_LOGIN_PATH "/usr/sbin:/bin:/usr/bin:/sbin"
44
45static void xsetenv ( const char *key, const char *value )
46{
47        if ( setenv ( key, value, 1 ))
48                bb_error_msg_and_die (bb_msg_memory_exhausted);
49}
50
51void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw )
52{
53    if ( loginshell ) {
54        const char *term;
55
56        /* Change the current working directory to be the home directory
57         * of the user.  It is a fatal error for this process to be unable
58         * to change to that directory.  There is no "default" home
59         * directory.
60         * Some systems default to HOME=/
61         */
62        if ( chdir ( pw-> pw_dir )) {
63            if ( chdir ( "/" )) {
64                syslog ( LOG_WARNING, "unable to cd to %s' for user %s'\n", pw-> pw_dir, pw-> pw_name );
65                bb_error_msg_and_die ( "cannot cd to home directory or /" );
66            }
67            fputs ( "warning: cannot change to home directory\n", stderr );
68        }
69
70        /* Leave TERM unchanged.  Set HOME, SHELL, USER, LOGNAME, PATH.
71           Unset all other environment variables.  */
72        term = getenv ("TERM");
73        clearenv ( );
74        if ( term )
75            xsetenv ( "TERM", term );
76        xsetenv ( "HOME",    pw-> pw_dir );
77        xsetenv ( "SHELL",   shell );
78        xsetenv ( "USER",    pw-> pw_name );
79        xsetenv ( "LOGNAME", pw-> pw_name );
80        xsetenv ( "PATH",    ( pw-> pw_uid ? DEFAULT_LOGIN_PATH : DEFAULT_ROOT_LOGIN_PATH ));
81    }
82    else if ( changeenv ) {
83        /* Set HOME, SHELL, and if not becoming a super-user,
84           USER and LOGNAME.  */
85        xsetenv ( "HOME",  pw-> pw_dir );
86        xsetenv ( "SHELL", shell );
87        if  ( pw-> pw_uid ) {
88            xsetenv ( "USER",    pw-> pw_name );
89            xsetenv ( "LOGNAME", pw-> pw_name );
90        }
91    }
92}
93
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