/*
 *  Audit helper functions used throughout shadow
 *
 *  Copyright (C) 2005, Red Hat, Inc.
 *
 * 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 <config.h>

#ifdef WITH_AUDIT

#include <stdlib.h>
#include <syslog.h>
#include <stdarg.h>
#include <libaudit.h>
#include <errno.h>
#include <stdio.h>
int audit_fd;

void audit_help_open (void)
{
	audit_fd = audit_open ();
	if (audit_fd < 0) {
		/* You get these only when the kernel doesn't have
		 * audit compiled in. */
		if (errno == EINVAL || errno == EPROTONOSUPPORT ||
		    errno == EAFNOSUPPORT)
			return;
		fprintf (stderr, "Cannot open audit interface - aborting.\n");
		exit (1);
	}
}

/*
 * This function will log a message to the audit system using a predefined
 * message format. Parameter usage is as follows:
 *
 * type - type of message: AUDIT_USER_CHAUTHTOK for changing any account 
 *	  attributes.
 * pgname - program's name
 * op  -  operation. "adding user", "changing finger info", "deleting group"
 * name - user's account or group name. If not available use NULL.
 * id  -  uid or gid that the operation is being performed on. This is used
 *	  only when user is NULL.
 * result - 1 is "success" and 0 is "failed"
 */
void audit_logger (int type, const char *pgname, const char *op,
		   const char *name, unsigned int id, int result)
{
	if (audit_fd < 0)
		return;
	else {
		char buf[PATH_MAX];
		const char *success;

		if (result)
			success = "success";
		else
			success = "failed";

		if (name)
			snprintf (buf, sizeof (buf), "%s: op=%s acct=%s res=%s",
				  pgname, op, name, success);
		else
			snprintf (buf, sizeof (buf), "%s: op=%s id=%u res=%s",
				  pgname, op, id, success);

		audit_send_user_message (audit_fd, type, buf);
	}
}

#endif				/* WITH_AUDIT */