LXR busybox/libbb/setup

   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
  32void 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