1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/boottrace.h> 34 #include <sys/reboot.h> 35 #include <sys/sysctl.h> 36 #include <sys/time.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <pwd.h> 42 #include <signal.h> 43 #include <stdbool.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <syslog.h> 48 #include <unistd.h> 49 #include <utmpx.h> 50 51 static void usage(void) __dead2; 52 static uint64_t get_pageins(void); 53 54 static bool dohalt; 55 56 int 57 main(int argc, char *argv[]) 58 { 59 struct utmpx utx; 60 const struct passwd *pw; 61 int ch, howto, i, fd, sverrno; 62 bool lflag, nflag, qflag, Nflag; 63 uint64_t pageins; 64 const char *user, *kernel = NULL; 65 66 if (strstr(getprogname(), "halt") != NULL) { 67 dohalt = true; 68 howto = RB_HALT; 69 } else 70 howto = 0; 71 lflag = nflag = qflag = Nflag = false; 72 while ((ch = getopt(argc, argv, "cdk:lNnpqr")) != -1) 73 switch(ch) { 74 case 'c': 75 howto |= RB_POWERCYCLE; 76 break; 77 case 'd': 78 howto |= RB_DUMP; 79 break; 80 case 'k': 81 kernel = optarg; 82 break; 83 case 'l': 84 lflag = true; 85 break; 86 case 'n': 87 nflag = true; 88 howto |= RB_NOSYNC; 89 break; 90 case 'N': 91 nflag = true; 92 Nflag = true; 93 break; 94 case 'p': 95 howto |= RB_POWEROFF; 96 break; 97 case 'q': 98 qflag = true; 99 break; 100 case 'r': 101 howto |= RB_REROOT; 102 break; 103 case '?': 104 default: 105 usage(); 106 } 107 argc -= optind; 108 argv += optind; 109 if (argc != 0) 110 usage(); 111 112 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 113 errx(1, "cannot dump (-d) when halting; must reboot instead"); 114 if (Nflag && (howto & RB_NOSYNC) != 0) 115 errx(1, "-N cannot be used with -n"); 116 if ((howto & RB_POWEROFF) && (howto & RB_POWERCYCLE)) 117 errx(1, "-c and -p cannot be used together"); 118 if ((howto & RB_REROOT) != 0 && howto != RB_REROOT) 119 errx(1, "-r cannot be used with -c, -d, -n, or -p"); 120 if ((howto & RB_REROOT) != 0 && kernel != NULL) 121 errx(1, "-r and -k cannot be used together, there is no next kernel"); 122 if (geteuid()) { 123 errno = EPERM; 124 err(1, NULL); 125 } 126 127 if (qflag) { 128 reboot(howto); 129 err(1, NULL); 130 } 131 132 if (kernel != NULL) { 133 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC, 134 0444); 135 if (fd > -1) { 136 (void)write(fd, "nextboot_enable=\"YES\"\n", 22); 137 (void)write(fd, "kernel=\"", 8L); 138 (void)write(fd, kernel, strlen(kernel)); 139 (void)write(fd, "\"\n", 2); 140 close(fd); 141 } 142 } 143 144 /* Log the reboot. */ 145 if (!lflag) { 146 if ((user = getlogin()) == NULL) 147 user = (pw = getpwuid(getuid())) ? 148 pw->pw_name : "???"; 149 if (dohalt) { 150 openlog("halt", 0, LOG_AUTH | LOG_CONS); 151 syslog(LOG_CRIT, "halted by %s", user); 152 } else if (howto & RB_REROOT) { 153 openlog("reroot", 0, LOG_AUTH | LOG_CONS); 154 syslog(LOG_CRIT, "rerooted by %s", user); 155 } else if (howto & RB_POWEROFF) { 156 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 157 syslog(LOG_CRIT, "powered off by %s", user); 158 } else if (howto & RB_POWERCYCLE) { 159 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 160 syslog(LOG_CRIT, "power cycled by %s", user); 161 } else { 162 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 163 syslog(LOG_CRIT, "rebooted by %s", user); 164 } 165 } 166 utx.ut_type = SHUTDOWN_TIME; 167 gettimeofday(&utx.ut_tv, NULL); 168 pututxline(&utx); 169 170 /* 171 * Do a sync early on, so disks start transfers while we're off 172 * killing processes. Don't worry about writes done before the 173 * processes die, the reboot system call syncs the disks. 174 */ 175 if (!nflag) 176 sync(); 177 178 /* 179 * Ignore signals that we can get as a result of killing 180 * parents, group leaders, etc. 181 */ 182 (void)signal(SIGHUP, SIG_IGN); 183 (void)signal(SIGINT, SIG_IGN); 184 (void)signal(SIGQUIT, SIG_IGN); 185 (void)signal(SIGTERM, SIG_IGN); 186 (void)signal(SIGTSTP, SIG_IGN); 187 188 /* 189 * If we're running in a pipeline, we don't want to die 190 * after killing whatever we're writing to. 191 */ 192 (void)signal(SIGPIPE, SIG_IGN); 193 194 /* 195 * Only init(8) can perform rerooting. 196 */ 197 if (howto & RB_REROOT) { 198 if (kill(1, SIGEMT) == -1) 199 err(1, "SIGEMT init"); 200 201 return (0); 202 } 203 204 /* Just stop init -- if we fail, we'll restart it. */ 205 BOOTTRACE("SIGTSTP to init(8)..."); 206 if (kill(1, SIGTSTP) == -1) 207 err(1, "SIGTSTP init"); 208 209 /* Send a SIGTERM first, a chance to save the buffers. */ 210 BOOTTRACE("SIGTERM to all other processes..."); 211 if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 212 err(1, "SIGTERM processes"); 213 214 /* 215 * After the processes receive the signal, start the rest of the 216 * buffers on their way. Wait 5 seconds between the SIGTERM and 217 * the SIGKILL to give everybody a chance. If there is a lot of 218 * paging activity then wait longer, up to a maximum of approx 219 * 60 seconds. 220 */ 221 sleep(2); 222 for (i = 0; i < 20; i++) { 223 pageins = get_pageins(); 224 if (!nflag) 225 sync(); 226 sleep(3); 227 if (get_pageins() == pageins) 228 break; 229 } 230 231 for (i = 1;; ++i) { 232 BOOTTRACE("SIGKILL to all other processes(%d)...", i); 233 if (kill(-1, SIGKILL) == -1) { 234 if (errno == ESRCH) 235 break; 236 goto restart; 237 } 238 if (i > 5) { 239 (void)fprintf(stderr, 240 "WARNING: some process(es) wouldn't die\n"); 241 break; 242 } 243 (void)sleep(2 * i); 244 } 245 246 reboot(howto); 247 /* FALLTHROUGH */ 248 249 restart: 250 BOOTTRACE("SIGHUP to init(8)..."); 251 sverrno = errno; 252 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 253 strerror(sverrno)); 254 /* NOTREACHED */ 255 } 256 257 static void 258 usage(void) 259 { 260 261 (void)fprintf(stderr, dohalt ? 262 "usage: halt [-clNnpq] [-k kernel]\n" : 263 "usage: reboot [-cdlNnpqr] [-k kernel]\n"); 264 exit(1); 265 } 266 267 static uint64_t 268 get_pageins(void) 269 { 270 uint64_t pageins; 271 size_t len; 272 273 len = sizeof(pageins); 274 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 275 != 0) { 276 warn("v_swappgsin"); 277 return (0); 278 } 279 return (pageins); 280 } 281