1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2001 Jonathan Lemon <jlemon@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/types.h>
33#include <sys/sysctl.h>
34#include <sys/ioctl.h>
35#include <sys/ttycom.h>
36
37#include <err.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44
45#define DEVDIR	"/dev/"
46
47static void __dead2
48usage(void)
49{
50
51	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
52	    "usage: conscontrol [list]",
53	    "       conscontrol mute on | off",
54	    "       conscontrol add | delete console",
55	    "       conscontrol set | unset console");
56	exit(1);
57}
58
59static void
60consstatus(void)
61{
62	int mute;
63	size_t len;
64	char *buf, *p, *avail;
65
66	len = sizeof(mute);
67	if (sysctlbyname("kern.consmute", &mute, &len, NULL, 0) == -1)
68		err(1, "kern.consmute retrieval failed");
69	if (sysctlbyname("kern.console", NULL, &len, NULL, 0) == -1)
70		err(1, "kern.console estimate failed");
71	if ((buf = malloc(len)) == NULL)
72		errx(1, "kern.console malloc failed");
73	if (sysctlbyname("kern.console", buf, &len, NULL, 0) == -1)
74		err(1, "kern.console retrieval failed");
75	if ((avail = strchr(buf, '/')) == NULL)
76		errx(1, "kern.console format not understood");
77	p = avail;
78	*avail++ = '\0';
79	if (p != buf)
80		*--p = '\0';			/* remove trailing ',' */
81	p = avail + strlen(avail);
82	if (p != avail)
83		*--p = '\0';			/* remove trailing ',' */
84	printf("Configured: %s\n", buf);
85	printf(" Available: %s\n", avail);
86	printf("    Muting: %s\n", mute ? "on" : "off");
87	free(buf);
88}
89
90static void
91consmute(const char *onoff)
92{
93	int mute;
94	size_t len;
95
96	if (strcmp(onoff, "on") == 0)
97		mute = 1;
98	else if (strcmp(onoff, "off") == 0)
99		mute = 0;
100	else
101		usage();
102	len = sizeof(mute);
103	if (sysctlbyname("kern.consmute", NULL, NULL, &mute, len) == -1)
104		err(1, "could not change console muting");
105}
106
107/*
108 * The name we supply to the sysctls should be an entry in /dev.  If
109 * the user has specified the full pathname in /dev, DTRT.  If he
110 * specifies a name in some other directory, it's an error.
111 */
112
113static char*
114stripdev(char *devnam)
115{
116	if (memcmp (devnam, DEVDIR, strlen(DEVDIR)) == 0)
117		return (&devnam[strlen(DEVDIR)]);	    /* remove /dev */
118	else if (strchr (devnam, '/')) {
119		fprintf(stderr, "Not a device in /dev: %s\n", devnam);
120		return (NULL);				    /* end of string */
121	} else
122		return (devnam);			    /* passed */
123}
124
125static void
126consadd(char *devnam)
127{
128	size_t len;
129
130	devnam = stripdev(devnam);
131	if (devnam == NULL)
132		return;
133	len = strlen(devnam);
134	if (sysctlbyname("kern.console", NULL, NULL, devnam, len) == -1)
135		err(1, "could not add %s as a console", devnam);
136}
137
138static void
139consdel(char *devnam)
140{
141	char *buf;
142	size_t len;
143
144	devnam = stripdev(devnam);
145	if (devnam == NULL)
146		return;
147	len = strlen(devnam) + sizeof("-");
148	if ((buf = malloc(len)) == NULL)
149		errx(1, "malloc failed");
150	buf[0] = '-';
151	strcpy(buf + 1, devnam);
152	if (sysctlbyname("kern.console", NULL, NULL, buf, len) == -1)
153		err(1, "could not remove %s as a console", devnam);
154	free(buf);
155}
156
157static void
158consset(char *devnam, int flag)
159{
160	int ttyfd;
161
162	ttyfd = open(devnam, O_RDONLY);
163	if (ttyfd == -1)
164		err(1, "opening %s", devnam);
165	if (ioctl(ttyfd, TIOCCONS, &flag) == -1)
166		err(1, "could not %s %s as virtual console",
167		    flag ? "set" : "unset", devnam);
168	close(ttyfd);
169}
170
171int
172main(int argc, char **argv)
173{
174
175	if (getopt(argc, argv, "") != -1)
176		usage();
177	argc -= optind;
178	argv += optind;
179
180	if (argc > 0 && strcmp(argv[0], "list") != 0) {
181		if (argc != 2)
182			usage();
183		else if (strcmp(argv[0], "mute") == 0)
184			consmute(argv[1]);
185		else if (strcmp(argv[0], "add") == 0)
186			consadd(argv[1]);
187		else if (strcmp(argv[0], "delete") == 0)
188			consdel(argv[1]);
189		else if (strcmp(argv[0], "set") == 0)
190			consset(argv[1], 1);
191		else if (strcmp(argv[0], "unset") == 0)
192			consset(argv[1], 0);
193		else
194			usage();
195	}
196	consstatus();
197	exit(0);
198}
199