/*      $OpenBSD: db_usrreq.c,v 1.23 2025/05/19 21:48:28 kettenis 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.
 *
 * 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/systm.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/sysctl.h>
#include <dev/cons.h>

#include <ddb/db_var.h>

int     db_log = 1;
int     db_profile;                     /* Allow dynamic profiling */
int     db_suspend;

const struct sysctl_bounded_args ddb_vars[] = {
        { DBCTL_RADIX, &db_radix, 8, 16 },
        { DBCTL_MAXWIDTH, &db_max_width, 0, INT_MAX },
        { DBCTL_TABSTOP, &db_tab_stop_width, 1, 16 },
        { DBCTL_MAXLINE, &db_max_line, 0, INT_MAX },
        { DBCTL_LOG, &db_log, 0, 1 },
        { DBCTL_SUSPEND, &db_suspend, 0, 1 },
};

int
ddb_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
    size_t newlen, struct proc *p)
{
        /* All sysctl names at this level are terminal. */
        if (namelen != 1)
                return (ENOTDIR);

        switch (name[0]) {
        case DBCTL_PANIC:
                if (securelevel > 0)
                        return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
                            &db_panic));
                else {
                        return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
                            &db_panic, 0, 1));
                }
                break;
        case DBCTL_CONSOLE:
                if (securelevel > 0)
                        return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
                            &db_console));
                else {
                        return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
                            &db_console, 0, 1));
                }
                break;
        case DBCTL_TRIGGER:
                if (newp && db_console) {
                        struct process *pr = curproc->p_p;

                        if (securelevel < 1 ||
                            (pr->ps_flags & PS_CONTROLT && cn_tab &&
                            cn_tab->cn_dev == pr->ps_session->s_ttyp->t_dev)) {
                                db_enter();
                                newp = NULL;
                        } else
                                return (ENODEV);
                }
                return (sysctl_rdint(oldp, oldlenp, newp, 0));
#if defined(DDBPROF)
        case DBCTL_PROFILE:
                if (securelevel > 0)
                        return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
                            &db_profile));
                else {
                        return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
                            &db_profile, 0, 1));
                }
                break;
#endif /* DDBPROF */
        default:
                return (sysctl_bounded_arr(ddb_vars, nitems(ddb_vars), name,
                    namelen, oldp, oldlenp, newp, newlen));
        }
        /* NOTREACHED */
}