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 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 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 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* 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 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 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 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 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