shadow/libmisc/failure.h

/*
 * Copyright (c) 1990 - 1994, Julianne Frances Haugh
 * Copyright (c) 1997 - 2000, Marek Michałkiewicz
 * Copyright (c) 2005       , Tomasz Kłoczko
 * Copyright (c) 2008 - 2009, Nicolas François
 * 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. The name of the copyright holders or contributors may not be used to
 *    endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT
 * HOLDERS 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.
 */

/* $Id$ */
#ifndef _FAILURE_H_
#define _FAILURE_H_

#include "defines.h"
#include "faillog.h"
#ifdef USE_UTMPX
#include <utmpx.h>
#else					/* !USE_UTMPX */
#include <utmp.h>
#endif					/* !USE_UTMPX */

/*
 * failure - make failure entry
 *
 *	failure() creates a new (struct faillog) entry or updates an
 *	existing one with the current failed login information.
 */
extern void failure (uid_t, const char *, struct faillog *);

/*
 * failcheck - check for failures > allowable
 *
 *	failcheck() is called AFTER the password has been validated.  If the
 *	account has been "attacked" with too many login failures, failcheck()
 *	returns FALSE to indicate that the login should be denied even though
 *	the password is valid.
 */
extern int failcheck (uid_t uid, struct faillog *fl, bool failed);

/*
 * failprint - print line of failure information
 *
 *	failprint takes a (struct faillog) entry and formats it into a
 *	message which is displayed at login time.
 */
extern void failprint (const struct faillog *);

/*
 * failtmp - update the cumulative failure log
 *
 *	failtmp updates the (struct utmp) formatted failure log which
 *	maintains a record of all login failures.
 */
#ifdef USE_UTMPX
extern void failtmp (const char *username, const struct utmpx *);
#else				/* !USE_UTMPX */
extern void failtmp (const char *username, const struct utmp *);
#endif				/* !USE_UTMPX */

#endif