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 #include "libbb.h"
31
setup_environment(const char * shell,int flags,const struct passwd * pw)32 void FAST_FUNC setup_environment(const char *shell, int flags, const struct passwd *pw)
33 {
34 if (!shell || !shell[0])
35 shell = DEFAULT_SHELL;
36
37 /* Change the current working directory to be the home directory
38 * of the user */
39 if (!(flags & SETUP_ENV_NO_CHDIR)) {
40 if (chdir(pw->pw_dir) != 0) {
41 bb_error_msg("can't change directory to '%s'", pw->pw_dir);
42 xchdir((flags & SETUP_ENV_TO_TMP) ? "/tmp" : "/");
43 }
44 }
45
46 if (flags & SETUP_ENV_CLEARENV) {
47 const char *term;
48
49 /* Leave TERM unchanged. Set HOME, SHELL, USER, LOGNAME, PATH.
50 * Unset all other environment variables. */
51 term = getenv("TERM");
52 clearenv();
53 if (term)
54 xsetenv("TERM", term);
55 xsetenv("PATH", (pw->pw_uid ? bb_default_path : bb_default_root_path));
56 goto shortcut;
57 // No, gcc (4.2.1) is not clever enougn to do it itself.
58 //xsetenv("USER", pw->pw_name);
59 //xsetenv("LOGNAME", pw->pw_name);
60 //xsetenv("HOME", pw->pw_dir);
61 //xsetenv("SHELL", shell);
62 } else if (flags & SETUP_ENV_CHANGEENV) {
63 /* Set HOME, SHELL, and if not becoming a super-user,
64 * USER and LOGNAME. */
65 if (pw->pw_uid) {
66 shortcut:
67 xsetenv("USER", pw->pw_name);
68 xsetenv("LOGNAME", pw->pw_name);
69 }
70 xsetenv("HOME", pw->pw_dir);
71 xsetenv("SHELL", shell);
72 }
73 }
74