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/stat.h> 36 #include <sys/sysctl.h> 37 #include <sys/time.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <pwd.h> 43 #include <signal.h> 44 #include <stdbool.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <syslog.h> 49 #include <unistd.h> 50 #include <utmpx.h> 51 52 static void usage(void) __dead2; 53 static uint64_t get_pageins(void); 54 55 static bool dohalt; 56 57 int 58 main(int argc, char *argv[]) 59 { 60 struct utmpx utx; 61 const struct passwd *pw; 62 int ch, howto, i, fd, sverrno; 63 bool fflag, lflag, nflag, qflag, Nflag; 64 uint64_t pageins; 65 const char *user, *kernel = NULL; 66 67 if (strstr(getprogname(), "halt") != NULL) { 68 dohalt = true; 69 howto = RB_HALT; 70 } else 71 howto = 0; 72 fflag = lflag = nflag = qflag = Nflag = false; 73 while ((ch = getopt(argc, argv, "cdk:lNnpqr")) != -1) 74 switch(ch) { 75 case 'c': 76 howto |= RB_POWERCYCLE; 77 break; 78 case 'd': 79 howto |= RB_DUMP; 80 break; 81 case 'f': 82 fflag = true; 83 break; 84 case 'k': 85 kernel = optarg; 86 break; 87 case 'l': 88 lflag = true; 89 break; 90 case 'n': 91 nflag = true; 92 howto |= RB_NOSYNC; 93 break; 94 case 'N': 95 nflag = true; 96 Nflag = true; 97 break; 98 case 'p': 99 howto |= RB_POWEROFF; 100 break; 101 case 'q': 102 qflag = true; 103 break; 104 case 'r': 105 howto |= RB_REROOT; 106 break; 107 case '?': 108 default: 109 usage(); 110 } 111 argc -= optind; 112 argv += optind; 113 if (argc != 0) 114 usage(); 115 116 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 117 errx(1, "cannot dump (-d) when halting; must reboot instead"); 118 if (Nflag && (howto & RB_NOSYNC) != 0) 119 errx(1, "-N cannot be used with -n"); 120 if ((howto & RB_POWEROFF) && (howto & RB_POWERCYCLE)) 121 errx(1, "-c and -p cannot be used together"); 122 if ((howto & RB_REROOT) != 0 && howto != RB_REROOT) 123 errx(1, "-r cannot be used with -c, -d, -n, or -p"); 124 if ((howto & RB_REROOT) != 0 && kernel != NULL) 125 errx(1, "-r and -k cannot be used together, there is no next kernel"); 126 if (geteuid()) { 127 errno = EPERM; 128 err(1, NULL); 129 } 130 131 if (qflag) { 132 reboot(howto); 133 err(1, NULL); 134 } 135 136 if (kernel != NULL) { 137 if (!fflag) { 138 char *k; 139 struct stat sb; 140 141 asprintf(&k, "/boot/%s/kernel", kernel); 142 if (k == NULL) 143 errx(1, "No memory to check %s", kernel); 144 if (stat(k, &sb) != 0) 145 err(1, "stat %s", k); 146 if (!S_ISREG(sb.st_mode)) 147 errx(1, "%s is not a file", k); 148 free(k); 149 } 150 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC, 151 0444); 152 if (fd > -1) { 153 (void)write(fd, "nextboot_enable=\"YES\"\n", 22); 154 (void)write(fd, "kernel=\"", 8L); 155 (void)write(fd, kernel, strlen(kernel)); 156 (void)write(fd, "\"\n", 2); 157 close(fd); 158 } 159 } 160 161 /* Log the reboot. */ 162 if (!lflag) { 163 if ((user = getlogin()) == NULL) 164 user = (pw = getpwuid(getuid())) ? 165 pw->pw_name : "???"; 166 if (dohalt) { 167 openlog("halt", 0, LOG_AUTH | LOG_CONS); 168 syslog(LOG_CRIT, "halted by %s", user); 169 } else if (howto & RB_REROOT) { 170 openlog("reroot", 0, LOG_AUTH | LOG_CONS); 171 syslog(LOG_CRIT, "rerooted by %s", user); 172 } else if (howto & RB_POWEROFF) { 173 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 174 syslog(LOG_CRIT, "powered off by %s", user); 175 } else if (howto & RB_POWERCYCLE) { 176 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 177 syslog(LOG_CRIT, "power cycled by %s", user); 178 } else { 179 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 180 syslog(LOG_CRIT, "rebooted by %s", user); 181 } 182 } 183 utx.ut_type = SHUTDOWN_TIME; 184 gettimeofday(&utx.ut_tv, NULL); 185 pututxline(&utx); 186 187 /* 188 * Do a sync early on, so disks start transfers while we're off 189 * killing processes. Don't worry about writes done before the 190 * processes die, the reboot system call syncs the disks. 191 */ 192 if (!nflag) 193 sync(); 194 195 /* 196 * Ignore signals that we can get as a result of killing 197 * parents, group leaders, etc. 198 */ 199 (void)signal(SIGHUP, SIG_IGN); 200 (void)signal(SIGINT, SIG_IGN); 201 (void)signal(SIGQUIT, SIG_IGN); 202 (void)signal(SIGTERM, SIG_IGN); 203 (void)signal(SIGTSTP, SIG_IGN); 204 205 /* 206 * If we're running in a pipeline, we don't want to die 207 * after killing whatever we're writing to. 208 */ 209 (void)signal(SIGPIPE, SIG_IGN); 210 211 /* 212 * Only init(8) can perform rerooting. 213 */ 214 if (howto & RB_REROOT) { 215 if (kill(1, SIGEMT) == -1) 216 err(1, "SIGEMT init"); 217 218 return (0); 219 } 220 221 /* Just stop init -- if we fail, we'll restart it. */ 222 BOOTTRACE("SIGTSTP to init(8)..."); 223 if (kill(1, SIGTSTP) == -1) 224 err(1, "SIGTSTP init"); 225 226 /* Send a SIGTERM first, a chance to save the buffers. */ 227 BOOTTRACE("SIGTERM to all other processes..."); 228 if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 229 err(1, "SIGTERM processes"); 230 231 /* 232 * After the processes receive the signal, start the rest of the 233 * buffers on their way. Wait 5 seconds between the SIGTERM and 234 * the SIGKILL to give everybody a chance. If there is a lot of 235 * paging activity then wait longer, up to a maximum of approx 236 * 60 seconds. 237 */ 238 sleep(2); 239 for (i = 0; i < 20; i++) { 240 pageins = get_pageins(); 241 if (!nflag) 242 sync(); 243 sleep(3); 244 if (get_pageins() == pageins) 245 break; 246 } 247 248 for (i = 1;; ++i) { 249 BOOTTRACE("SIGKILL to all other processes(%d)...", i); 250 if (kill(-1, SIGKILL) == -1) { 251 if (errno == ESRCH) 252 break; 253 goto restart; 254 } 255 if (i > 5) { 256 (void)fprintf(stderr, 257 "WARNING: some process(es) wouldn't die\n"); 258 break; 259 } 260 (void)sleep(2 * i); 261 } 262 263 reboot(howto); 264 /* FALLTHROUGH */ 265 266 restart: 267 BOOTTRACE("SIGHUP to init(8)..."); 268 sverrno = errno; 269 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 270 strerror(sverrno)); 271 /* NOTREACHED */ 272 } 273 274 static void 275 usage(void) 276 { 277 278 (void)fprintf(stderr, dohalt ? 279 "usage: halt [-clNnpq] [-k kernel]\n" : 280 "usage: reboot [-cdlNnpqr] [-k kernel]\n"); 281 exit(1); 282 } 283 284 static uint64_t 285 get_pageins(void) 286 { 287 uint64_t pageins; 288 size_t len; 289 290 len = sizeof(pageins); 291 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 292 != 0) { 293 warn("v_swappgsin"); 294 return (0); 295 } 296 return (pageins); 297 } 298