1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*-
* Copyright (c) 2001 Jonathan Lemon <jlemon@FreeBSD.org>
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/ioctl.h>
#include <sys/ttycom.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define DEVDIR "/dev/"
static void __dead2
usage(void)
{
(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
"usage: conscontrol [list]",
" conscontrol mute on | off",
" conscontrol add | delete console",
" conscontrol set | unset console");
exit(1);
}
static void
consstatus(void)
{
int mute;
size_t len;
char *buf, *p, *avail;
len = sizeof(mute);
if (sysctlbyname("kern.consmute", &mute, &len, NULL, 0) == -1)
err(1, "kern.consmute retrieval failed");
if (sysctlbyname("kern.console", NULL, &len, NULL, 0) == -1)
err(1, "kern.console estimate failed");
if ((buf = malloc(len)) == NULL)
errx(1, "kern.console malloc failed");
if (sysctlbyname("kern.console", buf, &len, NULL, 0) == -1)
err(1, "kern.console retrieval failed");
if ((avail = strchr(buf, '/')) == NULL)
errx(1, "kern.console format not understood");
p = avail;
*avail++ = '\0';
if (p != buf)
*--p = '\0'; /* remove trailing ',' */
p = avail + strlen(avail);
if (p != avail)
*--p = '\0'; /* remove trailing ',' */
printf("Configured: %s\n", buf);
printf(" Available: %s\n", avail);
printf(" Muting: %s\n", mute ? "on" : "off");
free(buf);
}
static void
consmute(const char *onoff)
{
int mute;
size_t len;
if (strcmp(onoff, "on") == 0)
mute = 1;
else if (strcmp(onoff, "off") == 0)
mute = 0;
else
usage();
len = sizeof(mute);
if (sysctlbyname("kern.consmute", NULL, NULL, &mute, len) == -1)
err(1, "could not change console muting");
}
/*
* The name we supply to the sysctls should be an entry in /dev. If
* the user has specified the full pathname in /dev, DTRT. If he
* specifies a name in some other directory, it's an error.
*/
static char*
stripdev(char *devnam)
{
if (memcmp (devnam, DEVDIR, strlen(DEVDIR)) == 0)
return (&devnam[strlen(DEVDIR)]); /* remove /dev */
else if (strchr (devnam, '/')) {
fprintf(stderr, "Not a device in /dev: %s\n", devnam);
return (NULL); /* end of string */
} else
return (devnam); /* passed */
}
static void
consadd(char *devnam)
{
size_t len;
devnam = stripdev(devnam);
if (devnam == NULL)
return;
len = strlen(devnam);
if (sysctlbyname("kern.console", NULL, NULL, devnam, len) == -1)
err(1, "could not add %s as a console", devnam);
}
static void
consdel(char *devnam)
{
char *buf;
size_t len;
devnam = stripdev(devnam);
if (devnam == NULL)
return;
len = strlen(devnam) + sizeof("-");
if ((buf = malloc(len)) == NULL)
errx(1, "malloc failed");
buf[0] = '-';
strcpy(buf + 1, devnam);
if (sysctlbyname("kern.console", NULL, NULL, buf, len) == -1)
err(1, "could not remove %s as a console", devnam);
free(buf);
}
static void
consset(char *devnam, int flag)
{
int ttyfd;
ttyfd = open(devnam, O_RDONLY);
if (ttyfd == -1)
err(1, "opening %s", devnam);
if (ioctl(ttyfd, TIOCCONS, &flag) == -1)
err(1, "could not %s %s as virtual console",
flag ? "set" : "unset", devnam);
close(ttyfd);
}
int
main(int argc, char **argv)
{
if (getopt(argc, argv, "") != -1)
usage();
argc -= optind;
argv += optind;
if (argc > 0 && strcmp(argv[0], "list") != 0) {
if (argc != 2)
usage();
else if (strcmp(argv[0], "mute") == 0)
consmute(argv[1]);
else if (strcmp(argv[0], "add") == 0)
consadd(argv[1]);
else if (strcmp(argv[0], "delete") == 0)
consdel(argv[1]);
else if (strcmp(argv[0], "set") == 0)
consset(argv[1], 1);
else if (strcmp(argv[0], "unset") == 0)
consset(argv[1], 0);
else
usage();
}
consstatus();
exit(0);
}
|
