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1/* $OpenBSD: db_usrreq.c,v 1.23 2025/05/19 21:48:28 kettenis Exp $ */
2
3/*
4 * Copyright (c) 1996 Michael Shalayeff. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/param.h>
28#include <sys/systm.h>
29#include <sys/proc.h>
30#include <sys/tty.h>
31#include <sys/sysctl.h>
32#include <dev/cons.h>
33
34#include <ddb/db_var.h>
35
36int db_log = 1;
37int db_profile; /* Allow dynamic profiling */
38int db_suspend;
39
40const struct sysctl_bounded_args ddb_vars[] = {
41 { DBCTL_RADIX, &db_radix, 8, 16 },
42 { DBCTL_MAXWIDTH, &db_max_width, 0, INT_MAX },
43 { DBCTL_TABSTOP, &db_tab_stop_width, 1, 16 },
44 { DBCTL_MAXLINE, &db_max_line, 0, INT_MAX },
45 { DBCTL_LOG, &db_log, 0, 1 },
46 { DBCTL_SUSPEND, &db_suspend, 0, 1 },
47};
48
49int
50ddb_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
51 size_t newlen, struct proc *p)
52{
53 /* All sysctl names at this level are terminal. */
54 if (namelen != 1)
55 return (ENOTDIR);
56
57 switch (name[0]) {
58 case DBCTL_PANIC:
59 if (securelevel > 0)
60 return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
61 &db_panic));
62 else {
63 return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
64 &db_panic, 0, 1));
65 }
66 break;
67 case DBCTL_CONSOLE:
68 if (securelevel > 0)
69 return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
70 &db_console));
71 else {
72 return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
73 &db_console, 0, 1));
74 }
75 break;
76 case DBCTL_TRIGGER:
77 if (newp && db_console) {
78 struct process *pr = curproc->p_p;
79
80 if (securelevel < 1 ||
81 (pr->ps_flags & PS_CONTROLT && cn_tab &&
82 cn_tab->cn_dev == pr->ps_session->s_ttyp->t_dev)) {
83 db_enter();
84 newp = NULL;
85 } else
86 return (ENODEV);
87 }
88 return (sysctl_rdint(oldp, oldlenp, newp, 0));
89#if defined(DDBPROF)
90 case DBCTL_PROFILE:
91 if (securelevel > 0)
92 return (sysctl_int_lower(oldp, oldlenp, newp, newlen,
93 &db_profile));
94 else {
95 return (sysctl_int_bounded(oldp, oldlenp, newp, newlen,
96 &db_profile, 0, 1));
97 }
98 break;
99#endif /* DDBPROF */
100 default:
101 return (sysctl_bounded_arr(ddb_vars, nitems(ddb_vars), name,
102 namelen, oldp, oldlenp, newp, newlen));
103 }
104 /* NOTREACHED */
105}