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deb-mbse/unix/myname.c

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2009-05-15 20:01:56 +00:00
/*****************************************************************************
*
* File ..................: mbuseradd/myname.c
* Purpose ...............: MBSE BBS Shadow Password Suite
* Last modification date : 25-Jul-2000
* Original Source .......: Shadow Password Suite
* Original Copyrioght ...: Julianne Frances Haugh and others.
*
*****************************************************************************
* Copyright (C) 1997-2000
*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* MBSE BBS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
/*
* myname.c - determine the current username and get the passwd entry
*
* Copyright (C) 1996 Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>
*
* This code may be freely used, modified and distributed for any purpose.
* There is no warranty, if it breaks you have to keep both pieces, etc.
* If you improve it, please send me your changes. Thanks!
*/
#include "../config.h"
#include <stdlib.h>
#include <unistd.h>
#include <pwd.h>
struct passwd *get_my_pwent(void)
{
struct passwd *pw;
const char *cp = getlogin();
uid_t ruid = getuid();
/*
* Try getlogin() first - if it fails or returns a non-existent
* username, or a username which doesn't match the real UID, fall
* back to getpwuid(getuid()). This should work reasonably with
* usernames longer than the utmp limit (8 characters), as well as
* shared UIDs - but not both at the same time...
*
* XXX - when running from su, will return the current user (not
* the original user, like getlogin() does). Does this matter?
*/
if (cp && *cp && (pw = getpwnam(cp)) && pw->pw_uid == ruid)
return pw;
return getpwuid(ruid);
}