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 <signal.h> 39 #include <err.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <pwd.h> 43 #include <syslog.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 #include <utmpx.h> 49 50 static void usage(void) __dead2; 51 static uint64_t get_pageins(void); 52 53 static int dohalt; 54 55 int 56 main(int argc, char *argv[]) 57 { 58 struct utmpx utx; 59 const struct passwd *pw; 60 int ch, howto, i, fd, lflag, nflag, qflag, sverrno, Nflag; 61 uint64_t pageins; 62 const char *user, *kernel = NULL; 63 64 if (strstr(getprogname(), "halt") != NULL) { 65 dohalt = 1; 66 howto = RB_HALT; 67 } else 68 howto = 0; 69 lflag = nflag = qflag = Nflag = 0; 70 while ((ch = getopt(argc, argv, "cdk:lNnpqr")) != -1) 71 switch(ch) { 72 case 'c': 73 howto |= RB_POWERCYCLE; 74 break; 75 case 'd': 76 howto |= RB_DUMP; 77 break; 78 case 'k': 79 kernel = optarg; 80 break; 81 case 'l': 82 lflag = 1; 83 break; 84 case 'n': 85 nflag = 1; 86 howto |= RB_NOSYNC; 87 break; 88 case 'N': 89 nflag = 1; 90 Nflag = 1; 91 break; 92 case 'p': 93 howto |= RB_POWEROFF; 94 break; 95 case 'q': 96 qflag = 1; 97 break; 98 case 'r': 99 howto |= RB_REROOT; 100 break; 101 case '?': 102 default: 103 usage(); 104 } 105 argc -= optind; 106 argv += optind; 107 if (argc != 0) 108 usage(); 109 110 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 111 errx(1, "cannot dump (-d) when halting; must reboot instead"); 112 if (Nflag && (howto & RB_NOSYNC) != 0) 113 errx(1, "-N cannot be used with -n"); 114 if ((howto & RB_POWEROFF) && (howto & RB_POWERCYCLE)) 115 errx(1, "-c and -p cannot be used together"); 116 if ((howto & RB_REROOT) != 0 && howto != RB_REROOT) 117 errx(1, "-r cannot be used with -c, -d, -n, or -p"); 118 if (geteuid()) { 119 errno = EPERM; 120 err(1, NULL); 121 } 122 123 if (qflag) { 124 reboot(howto); 125 err(1, NULL); 126 } 127 128 if (kernel != NULL) { 129 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC, 130 0444); 131 if (fd > -1) { 132 (void)write(fd, "nextboot_enable=\"YES\"\n", 22); 133 (void)write(fd, "kernel=\"", 8L); 134 (void)write(fd, kernel, strlen(kernel)); 135 (void)write(fd, "\"\n", 2); 136 close(fd); 137 } 138 } 139 140 /* Log the reboot. */ 141 if (!lflag) { 142 if ((user = getlogin()) == NULL) 143 user = (pw = getpwuid(getuid())) ? 144 pw->pw_name : "???"; 145 if (dohalt) { 146 openlog("halt", 0, LOG_AUTH | LOG_CONS); 147 syslog(LOG_CRIT, "halted by %s", user); 148 } else if (howto & RB_REROOT) { 149 openlog("reroot", 0, LOG_AUTH | LOG_CONS); 150 syslog(LOG_CRIT, "rerooted by %s", user); 151 } else if (howto & RB_POWEROFF) { 152 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 153 syslog(LOG_CRIT, "powered off by %s", user); 154 } else if (howto & RB_POWERCYCLE) { 155 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 156 syslog(LOG_CRIT, "power cycled by %s", user); 157 } else { 158 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 159 syslog(LOG_CRIT, "rebooted by %s", user); 160 } 161 } 162 utx.ut_type = SHUTDOWN_TIME; 163 gettimeofday(&utx.ut_tv, NULL); 164 pututxline(&utx); 165 166 /* 167 * Do a sync early on, so disks start transfers while we're off 168 * killing processes. Don't worry about writes done before the 169 * processes die, the reboot system call syncs the disks. 170 */ 171 if (!nflag) 172 sync(); 173 174 /* 175 * Ignore signals that we can get as a result of killing 176 * parents, group leaders, etc. 177 */ 178 (void)signal(SIGHUP, SIG_IGN); 179 (void)signal(SIGINT, SIG_IGN); 180 (void)signal(SIGQUIT, SIG_IGN); 181 (void)signal(SIGTERM, SIG_IGN); 182 (void)signal(SIGTSTP, SIG_IGN); 183 184 /* 185 * If we're running in a pipeline, we don't want to die 186 * after killing whatever we're writing to. 187 */ 188 (void)signal(SIGPIPE, SIG_IGN); 189 190 /* 191 * Only init(8) can perform rerooting. 192 */ 193 if (howto & RB_REROOT) { 194 if (kill(1, SIGEMT) == -1) 195 err(1, "SIGEMT init"); 196 197 return (0); 198 } 199 200 /* Just stop init -- if we fail, we'll restart it. */ 201 BOOTTRACE("SIGTSTP to init(8)..."); 202 if (kill(1, SIGTSTP) == -1) 203 err(1, "SIGTSTP init"); 204 205 /* Send a SIGTERM first, a chance to save the buffers. */ 206 BOOTTRACE("SIGTERM to all other processes..."); 207 if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 208 err(1, "SIGTERM processes"); 209 210 /* 211 * After the processes receive the signal, start the rest of the 212 * buffers on their way. Wait 5 seconds between the SIGTERM and 213 * the SIGKILL to give everybody a chance. If there is a lot of 214 * paging activity then wait longer, up to a maximum of approx 215 * 60 seconds. 216 */ 217 sleep(2); 218 for (i = 0; i < 20; i++) { 219 pageins = get_pageins(); 220 if (!nflag) 221 sync(); 222 sleep(3); 223 if (get_pageins() == pageins) 224 break; 225 } 226 227 for (i = 1;; ++i) { 228 BOOTTRACE("SIGKILL to all other processes(%d)...", i); 229 if (kill(-1, SIGKILL) == -1) { 230 if (errno == ESRCH) 231 break; 232 goto restart; 233 } 234 if (i > 5) { 235 (void)fprintf(stderr, 236 "WARNING: some process(es) wouldn't die\n"); 237 break; 238 } 239 (void)sleep(2 * i); 240 } 241 242 reboot(howto); 243 /* FALLTHROUGH */ 244 245 restart: 246 BOOTTRACE("SIGHUP to init(8)..."); 247 sverrno = errno; 248 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 249 strerror(sverrno)); 250 /* NOTREACHED */ 251 } 252 253 static void 254 usage(void) 255 { 256 257 (void)fprintf(stderr, dohalt ? 258 "usage: halt [-clNnpq] [-k kernel]\n" : 259 "usage: reboot [-cdlNnpqr] [-k kernel]\n"); 260 exit(1); 261 } 262 263 static uint64_t 264 get_pageins(void) 265 { 266 uint64_t pageins; 267 size_t len; 268 269 len = sizeof(pageins); 270 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 271 != 0) { 272 warn("v_swappgsin"); 273 return (0); 274 } 275 return (pageins); 276 } 277