1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2001 Jonathan Lemon <[email protected]>
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 #include <sys/types.h>
31 #include <sys/sysctl.h>
32 #include <sys/ioctl.h>
33 #include <sys/ttycom.h>
34
35 #include <err.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42
43 #define DEVDIR "/dev/"
44
45 static void __dead2
usage(void)46 usage(void)
47 {
48
49 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
50 "usage: conscontrol [list]",
51 " conscontrol mute on | off",
52 " conscontrol add | delete console",
53 " conscontrol set | unset console");
54 exit(1);
55 }
56
57 static void
consstatus(void)58 consstatus(void)
59 {
60 int mute;
61 size_t len;
62 char *buf, *p, *avail;
63
64 len = sizeof(mute);
65 if (sysctlbyname("kern.consmute", &mute, &len, NULL, 0) == -1)
66 err(1, "kern.consmute retrieval failed");
67 if (sysctlbyname("kern.console", NULL, &len, NULL, 0) == -1)
68 err(1, "kern.console estimate failed");
69 if ((buf = malloc(len)) == NULL)
70 errx(1, "kern.console malloc failed");
71 if (sysctlbyname("kern.console", buf, &len, NULL, 0) == -1)
72 err(1, "kern.console retrieval failed");
73 if ((avail = strchr(buf, '/')) == NULL)
74 errx(1, "kern.console format not understood");
75 p = avail;
76 *avail++ = '\0';
77 if (p != buf)
78 *--p = '\0'; /* remove trailing ',' */
79 p = avail + strlen(avail);
80 if (p != avail)
81 *--p = '\0'; /* remove trailing ',' */
82 printf("Configured: %s\n", buf);
83 printf(" Available: %s\n", avail);
84 printf(" Muting: %s\n", mute ? "on" : "off");
85 free(buf);
86 }
87
88 static void
consmute(const char * onoff)89 consmute(const char *onoff)
90 {
91 int mute;
92 size_t len;
93
94 if (strcmp(onoff, "on") == 0)
95 mute = 1;
96 else if (strcmp(onoff, "off") == 0)
97 mute = 0;
98 else
99 usage();
100 len = sizeof(mute);
101 if (sysctlbyname("kern.consmute", NULL, NULL, &mute, len) == -1)
102 err(1, "could not change console muting");
103 }
104
105 /*
106 * The name we supply to the sysctls should be an entry in /dev. If
107 * the user has specified the full pathname in /dev, DTRT. If he
108 * specifies a name in some other directory, it's an error.
109 */
110
111 static char*
stripdev(char * devnam)112 stripdev(char *devnam)
113 {
114 if (memcmp (devnam, DEVDIR, strlen(DEVDIR)) == 0)
115 return (&devnam[strlen(DEVDIR)]); /* remove /dev */
116 else if (strchr (devnam, '/')) {
117 fprintf(stderr, "Not a device in /dev: %s\n", devnam);
118 return (NULL); /* end of string */
119 } else
120 return (devnam); /* passed */
121 }
122
123 static void
consadd(char * devnam)124 consadd(char *devnam)
125 {
126 size_t len;
127
128 devnam = stripdev(devnam);
129 if (devnam == NULL)
130 return;
131 len = strlen(devnam);
132 if (sysctlbyname("kern.console", NULL, NULL, devnam, len) == -1)
133 err(1, "could not add %s as a console", devnam);
134 }
135
136 static void
consdel(char * devnam)137 consdel(char *devnam)
138 {
139 char *buf;
140 size_t len;
141
142 devnam = stripdev(devnam);
143 if (devnam == NULL)
144 return;
145 len = strlen(devnam) + sizeof("-");
146 if ((buf = malloc(len)) == NULL)
147 errx(1, "malloc failed");
148 buf[0] = '-';
149 strcpy(buf + 1, devnam);
150 if (sysctlbyname("kern.console", NULL, NULL, buf, len) == -1)
151 err(1, "could not remove %s as a console", devnam);
152 free(buf);
153 }
154
155 static void
consset(char * devnam,int flag)156 consset(char *devnam, int flag)
157 {
158 int ttyfd;
159
160 ttyfd = open(devnam, O_RDONLY);
161 if (ttyfd == -1)
162 err(1, "opening %s", devnam);
163 if (ioctl(ttyfd, TIOCCONS, &flag) == -1)
164 err(1, "could not %s %s as virtual console",
165 flag ? "set" : "unset", devnam);
166 close(ttyfd);
167 }
168
169 int
main(int argc,char ** argv)170 main(int argc, char **argv)
171 {
172
173 if (getopt(argc, argv, "") != -1)
174 usage();
175 argc -= optind;
176 argv += optind;
177
178 if (argc > 0 && strcmp(argv[0], "list") != 0) {
179 if (argc != 2)
180 usage();
181 else if (strcmp(argv[0], "mute") == 0)
182 consmute(argv[1]);
183 else if (strcmp(argv[0], "add") == 0)
184 consadd(argv[1]);
185 else if (strcmp(argv[0], "delete") == 0)
186 consdel(argv[1]);
187 else if (strcmp(argv[0], "set") == 0)
188 consset(argv[1], 1);
189 else if (strcmp(argv[0], "unset") == 0)
190 consset(argv[1], 0);
191 else
192 usage();
193 }
194 consstatus();
195 exit(0);
196 }
197