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 47 static void __dead2 48 usage(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 59 static void 60 consstatus(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 90 static void 91 consmute(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 */ 112 113 static char* 114 stripdev(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 } 124 125 static void 126 consadd(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 } 137 138 static void 139 consdel(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 } 156 157 static void 158 consset(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 } 170 171 int 172 main(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