1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/types.h>
30 #include <sys/sysctl.h>
31 #include <sys/ioctl.h>
32 #include <sys/ttycom.h>
33
34 #include <err.h>
35 #include <errno.h>
36 #include <fcntl.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 #define DEVDIR "/dev/"
43
44 static void __dead2
usage(void)45 usage(void)
46 {
47
48 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
49 "usage: conscontrol [list]",
50 " conscontrol mute on | off",
51 " conscontrol add | delete console",
52 " conscontrol set | unset console");
53 exit(1);
54 }
55
56 static void
consstatus(void)57 consstatus(void)
58 {
59 int mute;
60 size_t len;
61 char *buf, *p, *avail;
62
63 len = sizeof(mute);
64 if (sysctlbyname("kern.consmute", &mute, &len, NULL, 0) == -1)
65 err(1, "kern.consmute retrieval failed");
66 if (sysctlbyname("kern.console", NULL, &len, NULL, 0) == -1)
67 err(1, "kern.console estimate failed");
68 if ((buf = malloc(len)) == NULL)
69 errx(1, "kern.console malloc failed");
70 if (sysctlbyname("kern.console", buf, &len, NULL, 0) == -1)
71 err(1, "kern.console retrieval failed");
72 if ((avail = strchr(buf, '/')) == NULL)
73 errx(1, "kern.console format not understood");
74 p = avail;
75 *avail++ = '\0';
76 if (p != buf)
77 *--p = '\0'; /* remove trailing ',' */
78 p = avail + strlen(avail);
79 if (p != avail)
80 *--p = '\0'; /* remove trailing ',' */
81 printf("Configured: %s\n", buf);
82 printf(" Available: %s\n", avail);
83 printf(" Muting: %s\n", mute ? "on" : "off");
84 free(buf);
85 }
86
87 static void
consmute(const char * onoff)88 consmute(const char *onoff)
89 {
90 int mute;
91 size_t len;
92
93 if (strcmp(onoff, "on") == 0)
94 mute = 1;
95 else if (strcmp(onoff, "off") == 0)
96 mute = 0;
97 else
98 usage();
99 len = sizeof(mute);
100 if (sysctlbyname("kern.consmute", NULL, NULL, &mute, len) == -1)
101 err(1, "could not change console muting");
102 }
103
104 /*
105 * The name we supply to the sysctls should be an entry in /dev. If
106 * the user has specified the full pathname in /dev, DTRT. If he
107 * specifies a name in some other directory, it's an error.
108 */
109
110 static char*
stripdev(char * devnam)111 stripdev(char *devnam)
112 {
113 if (memcmp (devnam, DEVDIR, strlen(DEVDIR)) == 0)
114 return (&devnam[strlen(DEVDIR)]); /* remove /dev */
115 else if (strchr (devnam, '/')) {
116 fprintf(stderr, "Not a device in /dev: %s\n", devnam);
117 return (NULL); /* end of string */
118 } else
119 return (devnam); /* passed */
120 }
121
122 static void
consadd(char * devnam)123 consadd(char *devnam)
124 {
125 size_t len;
126
127 devnam = stripdev(devnam);
128 if (devnam == NULL)
129 return;
130 len = strlen(devnam);
131 if (sysctlbyname("kern.console", NULL, NULL, devnam, len) == -1)
132 err(1, "could not add %s as a console", devnam);
133 }
134
135 static void
consdel(char * devnam)136 consdel(char *devnam)
137 {
138 char *buf;
139 size_t len;
140
141 devnam = stripdev(devnam);
142 if (devnam == NULL)
143 return;
144 len = strlen(devnam) + sizeof("-");
145 if ((buf = malloc(len)) == NULL)
146 errx(1, "malloc failed");
147 buf[0] = '-';
148 strcpy(buf + 1, devnam);
149 if (sysctlbyname("kern.console", NULL, NULL, buf, len) == -1)
150 err(1, "could not remove %s as a console", devnam);
151 free(buf);
152 }
153
154 static void
consset(char * devnam,int flag)155 consset(char *devnam, int flag)
156 {
157 int ttyfd;
158
159 ttyfd = open(devnam, O_RDONLY);
160 if (ttyfd == -1)
161 err(1, "opening %s", devnam);
162 if (ioctl(ttyfd, TIOCCONS, &flag) == -1)
163 err(1, "could not %s %s as virtual console",
164 flag ? "set" : "unset", devnam);
165 close(ttyfd);
166 }
167
168 int
main(int argc,char ** argv)169 main(int argc, char **argv)
170 {
171
172 if (getopt(argc, argv, "") != -1)
173 usage();
174 argc -= optind;
175 argv += optind;
176
177 if (argc > 0 && strcmp(argv[0], "list") != 0) {
178 if (argc != 2)
179 usage();
180 else if (strcmp(argv[0], "mute") == 0)
181 consmute(argv[1]);
182 else if (strcmp(argv[0], "add") == 0)
183 consadd(argv[1]);
184 else if (strcmp(argv[0], "delete") == 0)
185 consdel(argv[1]);
186 else if (strcmp(argv[0], "set") == 0)
187 consset(argv[1], 1);
188 else if (strcmp(argv[0], "unset") == 0)
189 consset(argv[1], 0);
190 else
191 usage();
192 }
193 consstatus();
194 exit(0);
195 }
196