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94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <ctype.h>
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#include "libbb.h"
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#define DEFAULT_LOGIN_PATH "/bin:/usr/bin"
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#define DEFAULT_ROOT_LOGIN_PATH "/usr/sbin:/bin:/usr/bin:/sbin"
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static void xsetenv ( const char *key, const char *value )
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{
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if ( setenv ( key, value, 1 ))
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bb_error_msg_and_die (bb_msg_memory_exhausted);
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}
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void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw )
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{
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if ( loginshell ) {
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const char *term;
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/* Change the current working directory to be the home directory
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* of the user. It is a fatal error for this process to be unable
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* to change to that directory. There is no "default" home
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* directory.
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* Some systems default to HOME=/
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*/
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if ( chdir ( pw-> pw_dir )) {
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if ( chdir ( "/" )) {
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syslog ( LOG_WARNING, "unable to cd to %s' for user %s'\n", pw-> pw_dir, pw-> pw_name );
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bb_error_msg_and_die ( "cannot cd to home directory or /" );
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}
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fputs ( "warning: cannot change to home directory\n", stderr );
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}
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/* Leave TERM unchanged. Set HOME, SHELL, USER, LOGNAME, PATH.
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Unset all other environment variables. */
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term = getenv ("TERM");
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clearenv ( );
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if ( term )
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xsetenv ( "TERM", term );
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xsetenv ( "HOME", pw-> pw_dir );
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xsetenv ( "SHELL", shell );
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xsetenv ( "USER", pw-> pw_name );
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xsetenv ( "LOGNAME", pw-> pw_name );
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xsetenv ( "PATH", ( pw-> pw_uid ? DEFAULT_LOGIN_PATH : DEFAULT_ROOT_LOGIN_PATH ));
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}
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else if ( changeenv ) {
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/* Set HOME, SHELL, and if not becoming a super-user,
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USER and LOGNAME. */
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xsetenv ( "HOME", pw-> pw_dir );
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xsetenv ( "SHELL", shell );
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if ( pw-> pw_uid ) {
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xsetenv ( "USER", pw-> pw_name );
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xsetenv ( "LOGNAME", pw-> pw_name );
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}
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}
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}
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