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Provide a means to lock ddb off on systems at high securelevel, in order
reduce the need for a custom kernel sans ddb.

/*	$OpenBSD: db_usrreq.c,v 1.4 2000/02/27 04:57:29 hugh Exp $	*/

/*
 * Copyright (c) 1996 Michael Shalayeff.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Michael Shalayeff.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sys/param.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <sys/sysctl.h>

#include <ddb/db_var.h>

extern int securelevel;

int
ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
	int	*name;
	u_int	namelen;
	void	*oldp;
	size_t	*oldlenp;
	void	*newp;
	size_t	newlen;
	struct proc *p;
{
	int error, ctlval;

	/* All sysctl names at this level are terminal. */
	if (namelen != 1)
		return (ENOTDIR);

	switch (name[0]) {

	case DBCTL_RADIX:
		return sysctl_int(oldp, oldlenp, newp, newlen, &db_radix);
	case DBCTL_MAXWIDTH:
		return sysctl_int(oldp, oldlenp, newp, newlen, &db_max_width);
	case DBCTL_TABSTOP:
		return sysctl_int(oldp, oldlenp, newp, newlen, &db_tab_stop_width);
	case DBCTL_MAXLINE:
		return sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line);
	case DBCTL_PANIC:
		ctlval = db_panic;
		if ((error = sysctl_int(oldp, oldlenp, newp, newlen, &ctlval)) ||
		    newp == NULL)
			return (error);
		if (ctlval != 1 && ctlval != 0)
			return (EINVAL);
		if (ctlval > db_panic && securelevel > 1)
			return (EPERM);
		db_panic = ctlval;
		return (0);
	case DBCTL_CONSOLE:
		ctlval = db_console;
		if ((error = sysctl_int(oldp, oldlenp, newp, newlen, &ctlval)) ||
		    newp == NULL)
			return (error);
		if (ctlval != 1 && ctlval != 0)
			return (EINVAL);
		if (ctlval > db_console && securelevel > 1)
			return (EPERM);
		db_console = ctlval;
		return (0);
	default:
		return (EOPNOTSUPP);
	}
	/* NOTREACHED */
}