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