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/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 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 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 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* 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 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 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 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 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