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 #define PATH_NEXTBOOT "/boot/nextboot.conf" 53 54 static void usage(void) __dead2; 55 static uint64_t get_pageins(void); 56 57 static bool dohalt; 58 59 static void 60 write_nextboot(const char *fn, const char *kernel, bool force) 61 { 62 FILE *fp; 63 64 #define E(...) do { \ 65 if (force) { \ 66 warn( __VA_ARGS__ ); \ 67 return; \ 68 } \ 69 err(1, __VA_ARGS__); \ 70 } while (0) \ 71 72 fp = fopen(fn, "w"); 73 if (fp == NULL) 74 E("Can't create %s to boot %s", fn, kernel); 75 76 if (fprintf(fp, 77 "nextboot_enable=\"YES\"\n" 78 "kernel=\"%s\"\n", kernel) < 0) { 79 int e; 80 81 e = errno; 82 fclose(fp); 83 if (unlink(fn)) 84 warn("unlink %s", fn); 85 errno = e; 86 E("Can't write %s", fn); 87 } 88 fclose(fp); 89 #undef E 90 } 91 92 int 93 main(int argc, char *argv[]) 94 { 95 struct utmpx utx; 96 const struct passwd *pw; 97 int ch, howto, i, sverrno; 98 bool fflag, lflag, nflag, qflag, Nflag; 99 uint64_t pageins; 100 const char *user, *kernel = NULL; 101 102 if (strstr(getprogname(), "halt") != NULL) { 103 dohalt = true; 104 howto = RB_HALT; 105 } else 106 howto = 0; 107 fflag = lflag = nflag = qflag = Nflag = false; 108 while ((ch = getopt(argc, argv, "cdk:lNnpqr")) != -1) 109 switch(ch) { 110 case 'c': 111 howto |= RB_POWERCYCLE; 112 break; 113 case 'd': 114 howto |= RB_DUMP; 115 break; 116 case 'f': 117 fflag = true; 118 break; 119 case 'k': 120 kernel = optarg; 121 break; 122 case 'l': 123 lflag = true; 124 break; 125 case 'n': 126 nflag = true; 127 howto |= RB_NOSYNC; 128 break; 129 case 'N': 130 nflag = true; 131 Nflag = true; 132 break; 133 case 'p': 134 howto |= RB_POWEROFF; 135 break; 136 case 'q': 137 qflag = true; 138 break; 139 case 'r': 140 howto |= RB_REROOT; 141 break; 142 case '?': 143 default: 144 usage(); 145 } 146 argc -= optind; 147 argv += optind; 148 if (argc != 0) 149 usage(); 150 151 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 152 errx(1, "cannot dump (-d) when halting; must reboot instead"); 153 if (Nflag && (howto & RB_NOSYNC) != 0) 154 errx(1, "-N cannot be used with -n"); 155 if ((howto & RB_POWEROFF) && (howto & RB_POWERCYCLE)) 156 errx(1, "-c and -p cannot be used together"); 157 if ((howto & RB_REROOT) != 0 && howto != RB_REROOT) 158 errx(1, "-r cannot be used with -c, -d, -n, or -p"); 159 if ((howto & RB_REROOT) != 0 && kernel != NULL) 160 errx(1, "-r and -k cannot be used together, there is no next kernel"); 161 if (geteuid()) { 162 errno = EPERM; 163 err(1, NULL); 164 } 165 166 if (qflag) { 167 reboot(howto); 168 err(1, NULL); 169 } 170 171 if (kernel != NULL) { 172 if (!fflag) { 173 char *k; 174 struct stat sb; 175 176 asprintf(&k, "/boot/%s/kernel", kernel); 177 if (k == NULL) 178 errx(1, "No memory to check %s", kernel); 179 if (stat(k, &sb) != 0) 180 err(1, "stat %s", k); 181 if (!S_ISREG(sb.st_mode)) 182 errx(1, "%s is not a file", k); 183 free(k); 184 } 185 write_nextboot(PATH_NEXTBOOT, kernel, fflag); 186 } 187 188 /* Log the reboot. */ 189 if (!lflag) { 190 if ((user = getlogin()) == NULL) 191 user = (pw = getpwuid(getuid())) ? 192 pw->pw_name : "???"; 193 if (dohalt) { 194 openlog("halt", 0, LOG_AUTH | LOG_CONS); 195 syslog(LOG_CRIT, "halted by %s", user); 196 } else if (howto & RB_REROOT) { 197 openlog("reroot", 0, LOG_AUTH | LOG_CONS); 198 syslog(LOG_CRIT, "rerooted by %s", user); 199 } else if (howto & RB_POWEROFF) { 200 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 201 syslog(LOG_CRIT, "powered off by %s", user); 202 } else if (howto & RB_POWERCYCLE) { 203 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 204 syslog(LOG_CRIT, "power cycled by %s", user); 205 } else { 206 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 207 syslog(LOG_CRIT, "rebooted by %s", user); 208 } 209 } 210 utx.ut_type = SHUTDOWN_TIME; 211 gettimeofday(&utx.ut_tv, NULL); 212 pututxline(&utx); 213 214 /* 215 * Do a sync early on, so disks start transfers while we're off 216 * killing processes. Don't worry about writes done before the 217 * processes die, the reboot system call syncs the disks. 218 */ 219 if (!nflag) 220 sync(); 221 222 /* 223 * Ignore signals that we can get as a result of killing 224 * parents, group leaders, etc. 225 */ 226 (void)signal(SIGHUP, SIG_IGN); 227 (void)signal(SIGINT, SIG_IGN); 228 (void)signal(SIGQUIT, SIG_IGN); 229 (void)signal(SIGTERM, SIG_IGN); 230 (void)signal(SIGTSTP, SIG_IGN); 231 232 /* 233 * If we're running in a pipeline, we don't want to die 234 * after killing whatever we're writing to. 235 */ 236 (void)signal(SIGPIPE, SIG_IGN); 237 238 /* 239 * Only init(8) can perform rerooting. 240 */ 241 if (howto & RB_REROOT) { 242 if (kill(1, SIGEMT) == -1) 243 err(1, "SIGEMT init"); 244 245 return (0); 246 } 247 248 /* Just stop init -- if we fail, we'll restart it. */ 249 BOOTTRACE("SIGTSTP to init(8)..."); 250 if (kill(1, SIGTSTP) == -1) 251 err(1, "SIGTSTP init"); 252 253 /* Send a SIGTERM first, a chance to save the buffers. */ 254 BOOTTRACE("SIGTERM to all other processes..."); 255 if (kill(-1, SIGTERM) == -1 && errno != ESRCH) 256 err(1, "SIGTERM processes"); 257 258 /* 259 * After the processes receive the signal, start the rest of the 260 * buffers on their way. Wait 5 seconds between the SIGTERM and 261 * the SIGKILL to give everybody a chance. If there is a lot of 262 * paging activity then wait longer, up to a maximum of approx 263 * 60 seconds. 264 */ 265 sleep(2); 266 for (i = 0; i < 20; i++) { 267 pageins = get_pageins(); 268 if (!nflag) 269 sync(); 270 sleep(3); 271 if (get_pageins() == pageins) 272 break; 273 } 274 275 for (i = 1;; ++i) { 276 BOOTTRACE("SIGKILL to all other processes(%d)...", i); 277 if (kill(-1, SIGKILL) == -1) { 278 if (errno == ESRCH) 279 break; 280 goto restart; 281 } 282 if (i > 5) { 283 (void)fprintf(stderr, 284 "WARNING: some process(es) wouldn't die\n"); 285 break; 286 } 287 (void)sleep(2 * i); 288 } 289 290 reboot(howto); 291 /* FALLTHROUGH */ 292 293 restart: 294 BOOTTRACE("SIGHUP to init(8)..."); 295 sverrno = errno; 296 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 297 strerror(sverrno)); 298 /* NOTREACHED */ 299 } 300 301 static void 302 usage(void) 303 { 304 305 (void)fprintf(stderr, dohalt ? 306 "usage: halt [-clNnpq] [-k kernel]\n" : 307 "usage: reboot [-cdlNnpqr] [-k kernel]\n"); 308 exit(1); 309 } 310 311 static uint64_t 312 get_pageins(void) 313 { 314 uint64_t pageins; 315 size_t len; 316 317 len = sizeof(pageins); 318 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 319 != 0) { 320 warn("v_swappgsin"); 321 return (0); 322 } 323 return (pageins); 324 } 325