1 |
|
|
/* $OpenBSD: reboot.c,v 1.38 2017/08/22 00:30:16 sf Exp $ */ |
2 |
|
|
/* $NetBSD: reboot.c,v 1.8 1995/10/05 05:36:22 mycroft Exp $ */ |
3 |
|
|
|
4 |
|
|
/* |
5 |
|
|
* Copyright (c) 1980, 1986, 1993 |
6 |
|
|
* The Regents of the University of California. All rights reserved. |
7 |
|
|
* |
8 |
|
|
* Redistribution and use in source and binary forms, with or without |
9 |
|
|
* modification, are permitted provided that the following conditions |
10 |
|
|
* are met: |
11 |
|
|
* 1. Redistributions of source code must retain the above copyright |
12 |
|
|
* notice, this list of conditions and the following disclaimer. |
13 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
14 |
|
|
* notice, this list of conditions and the following disclaimer in the |
15 |
|
|
* documentation and/or other materials provided with the distribution. |
16 |
|
|
* 3. Neither the name of the University nor the names of its contributors |
17 |
|
|
* may be used to endorse or promote products derived from this software |
18 |
|
|
* without specific prior written permission. |
19 |
|
|
* |
20 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
21 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
22 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
23 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
24 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
25 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
26 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
27 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
28 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
29 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
30 |
|
|
* SUCH DAMAGE. |
31 |
|
|
*/ |
32 |
|
|
|
33 |
|
|
#include <sys/types.h> |
34 |
|
|
#include <sys/reboot.h> |
35 |
|
|
#include <sys/sysctl.h> |
36 |
|
|
#include <sys/time.h> |
37 |
|
|
#include <sys/wait.h> |
38 |
|
|
#include <machine/cpu.h> |
39 |
|
|
#include <signal.h> |
40 |
|
|
#include <pwd.h> |
41 |
|
|
#include <errno.h> |
42 |
|
|
#include <err.h> |
43 |
|
|
#include <fcntl.h> |
44 |
|
|
#include <termios.h> |
45 |
|
|
#include <syslog.h> |
46 |
|
|
#include <unistd.h> |
47 |
|
|
#include <stdio.h> |
48 |
|
|
#include <stdlib.h> |
49 |
|
|
#include <string.h> |
50 |
|
|
#include <paths.h> |
51 |
|
|
#include <util.h> |
52 |
|
|
|
53 |
|
|
void usage(void); |
54 |
|
|
extern char *__progname; |
55 |
|
|
|
56 |
|
|
int dohalt; |
57 |
|
|
|
58 |
|
|
#define _PATH_RC "/etc/rc" |
59 |
|
|
|
60 |
|
|
static void |
61 |
|
|
sleep_while_procs(int seconds) |
62 |
|
|
{ |
63 |
|
|
while (seconds > 0) { |
64 |
|
|
if (kill(-1, 0) == -1 && errno == ESRCH) |
65 |
|
|
return; |
66 |
|
|
sleep(1); |
67 |
|
|
seconds--; |
68 |
|
|
} |
69 |
|
|
} |
70 |
|
|
|
71 |
|
|
int |
72 |
|
|
main(int argc, char *argv[]) |
73 |
|
|
{ |
74 |
|
|
unsigned int i; |
75 |
|
|
struct passwd *pw; |
76 |
|
|
int ch, howto, lflag, nflag, pflag, qflag; |
77 |
|
|
char *p, *user; |
78 |
|
|
sigset_t mask; |
79 |
|
|
|
80 |
|
|
p = __progname; |
81 |
|
|
|
82 |
|
|
/* Nuke login shell */ |
83 |
|
|
if (*p == '-') |
84 |
|
|
p++; |
85 |
|
|
|
86 |
|
|
howto = dohalt = lflag = nflag = pflag = qflag = 0; |
87 |
|
|
if (!strcmp(p, "halt")) { |
88 |
|
|
dohalt = 1; |
89 |
|
|
howto = RB_HALT; |
90 |
|
|
} |
91 |
|
|
|
92 |
|
|
while ((ch = getopt(argc, argv, "dlnpq")) != -1) |
93 |
|
|
switch (ch) { |
94 |
|
|
case 'd': |
95 |
|
|
howto |= RB_DUMP; |
96 |
|
|
break; |
97 |
|
|
case 'l': /* Undocumented; used by shutdown. */ |
98 |
|
|
lflag = 1; |
99 |
|
|
break; |
100 |
|
|
case 'n': |
101 |
|
|
nflag = 1; |
102 |
|
|
howto |= RB_NOSYNC; |
103 |
|
|
break; |
104 |
|
|
case 'p': |
105 |
|
|
/* Only works if we're called as halt. */ |
106 |
|
|
if (dohalt) { |
107 |
|
|
pflag = 1; |
108 |
|
|
howto |= RB_POWERDOWN; |
109 |
|
|
} |
110 |
|
|
break; |
111 |
|
|
case 'q': |
112 |
|
|
qflag = 1; |
113 |
|
|
break; |
114 |
|
|
default: |
115 |
|
|
usage(); |
116 |
|
|
} |
117 |
|
|
argc -= optind; |
118 |
|
|
argv += optind; |
119 |
|
|
|
120 |
|
|
if (argc) |
121 |
|
|
usage(); |
122 |
|
|
|
123 |
|
|
if (geteuid()) |
124 |
|
|
errx(1, "%s", strerror(EPERM)); |
125 |
|
|
|
126 |
|
|
#ifdef CPU_LIDACTION |
127 |
|
|
if (howto & RB_POWERDOWN) { |
128 |
|
|
/* Disable suspending on laptop lid close */ |
129 |
|
|
int mib[] = {CTL_MACHDEP, CPU_LIDACTION}; |
130 |
|
|
int lidaction = 0; |
131 |
|
|
|
132 |
|
|
if (sysctl(mib, 2, NULL, NULL, &lidaction, |
133 |
|
|
sizeof(lidaction)) == -1 && errno != EOPNOTSUPP) |
134 |
|
|
warn("sysctl"); |
135 |
|
|
} |
136 |
|
|
#endif /* CPU_LIDACTION */ |
137 |
|
|
|
138 |
|
|
if (qflag) { |
139 |
|
|
reboot(howto); |
140 |
|
|
err(1, "reboot"); |
141 |
|
|
} |
142 |
|
|
|
143 |
|
|
/* Log the reboot. */ |
144 |
|
|
if (!lflag) { |
145 |
|
|
if ((user = getlogin()) == NULL) |
146 |
|
|
user = (pw = getpwuid(getuid())) ? |
147 |
|
|
pw->pw_name : "???"; |
148 |
|
|
if (dohalt) { |
149 |
|
|
openlog("halt", 0, LOG_AUTH | LOG_CONS); |
150 |
|
|
if (pflag) { |
151 |
|
|
syslog(LOG_CRIT, |
152 |
|
|
"halted (with powerdown) by %s", user); |
153 |
|
|
} else { |
154 |
|
|
syslog(LOG_CRIT, "halted by %s", user); |
155 |
|
|
} |
156 |
|
|
} else { |
157 |
|
|
openlog("reboot", 0, LOG_AUTH | LOG_CONS); |
158 |
|
|
syslog(LOG_CRIT, "rebooted by %s", user); |
159 |
|
|
} |
160 |
|
|
} |
161 |
|
|
logwtmp("~", "shutdown", ""); |
162 |
|
|
|
163 |
|
|
/* |
164 |
|
|
* Do a sync early on, so disks start transfers while we're off |
165 |
|
|
* killing processes. Don't worry about writes done before the |
166 |
|
|
* processes die, the reboot system call syncs the disks. |
167 |
|
|
*/ |
168 |
|
|
if (!nflag) |
169 |
|
|
sync(); |
170 |
|
|
|
171 |
|
|
/* Just stop init -- if we fail, we'll restart it. */ |
172 |
|
|
if (kill(1, SIGTSTP) == -1) |
173 |
|
|
err(1, "SIGTSTP init"); |
174 |
|
|
|
175 |
|
|
/* Ignore the SIGHUP we get when our parent shell dies. */ |
176 |
|
|
(void)signal(SIGHUP, SIG_IGN); |
177 |
|
|
|
178 |
|
|
/* |
179 |
|
|
* If we're running in a pipeline, we don't want to die |
180 |
|
|
* after killing whatever we're writing to. |
181 |
|
|
*/ |
182 |
|
|
(void)signal(SIGPIPE, SIG_IGN); |
183 |
|
|
|
184 |
|
|
if (access(_PATH_RC, R_OK) != -1) { |
185 |
|
|
pid_t pid; |
186 |
|
|
struct termios t; |
187 |
|
|
int fd, status; |
188 |
|
|
|
189 |
|
|
switch ((pid = fork())) { |
190 |
|
|
case -1: |
191 |
|
|
break; |
192 |
|
|
case 0: |
193 |
|
|
if (revoke(_PATH_CONSOLE) == -1) |
194 |
|
|
warn("revoke"); |
195 |
|
|
if (setsid() == -1) |
196 |
|
|
warn("setsid"); |
197 |
|
|
fd = open(_PATH_CONSOLE, O_RDWR); |
198 |
|
|
if (fd == -1) |
199 |
|
|
warn("open"); |
200 |
|
|
dup2(fd, 0); |
201 |
|
|
dup2(fd, 1); |
202 |
|
|
dup2(fd, 2); |
203 |
|
|
if (fd > 2) |
204 |
|
|
close(fd); |
205 |
|
|
|
206 |
|
|
/* At a minimum... */ |
207 |
|
|
tcgetattr(0, &t); |
208 |
|
|
t.c_oflag |= (ONLCR | OPOST); |
209 |
|
|
tcsetattr(0, TCSANOW, &t); |
210 |
|
|
|
211 |
|
|
execl(_PATH_BSHELL, "sh", _PATH_RC, "shutdown", (char *)NULL); |
212 |
|
|
_exit(1); |
213 |
|
|
default: |
214 |
|
|
/* rc exits 2 if powerdown=YES in rc.shutdown */ |
215 |
|
|
waitpid(pid, &status, 0); |
216 |
|
|
if (dohalt && WIFEXITED(status) && WEXITSTATUS(status) == 2) |
217 |
|
|
howto |= RB_POWERDOWN; |
218 |
|
|
} |
219 |
|
|
} |
220 |
|
|
|
221 |
|
|
/* |
222 |
|
|
* Point of no return, block all signals so we are sure to |
223 |
|
|
* reach the call to reboot(2) unmolested. |
224 |
|
|
*/ |
225 |
|
|
sigfillset(&mask); |
226 |
|
|
sigprocmask(SIG_BLOCK, &mask, NULL); |
227 |
|
|
|
228 |
|
|
/* Send a SIGTERM first, a chance to save the buffers. */ |
229 |
|
|
if (kill(-1, SIGTERM) == -1) { |
230 |
|
|
/* |
231 |
|
|
* If ESRCH, everything's OK: we're the only non-system |
232 |
|
|
* process! That can happen e.g. via 'exec reboot' in |
233 |
|
|
* single-user mode. |
234 |
|
|
*/ |
235 |
|
|
if (errno != ESRCH) { |
236 |
|
|
warn("SIGTERM processes"); |
237 |
|
|
goto restart; |
238 |
|
|
} |
239 |
|
|
} |
240 |
|
|
|
241 |
|
|
/* |
242 |
|
|
* After the processes receive the signal, start the rest of the |
243 |
|
|
* buffers on their way. Wait 5 seconds between the SIGTERM and |
244 |
|
|
* the SIGKILL to give everybody a chance. |
245 |
|
|
*/ |
246 |
|
|
sleep_while_procs(2); |
247 |
|
|
if (!nflag) |
248 |
|
|
sync(); |
249 |
|
|
sleep_while_procs(3); |
250 |
|
|
|
251 |
|
|
for (i = 1;; ++i) { |
252 |
|
|
if (kill(-1, SIGKILL) == -1) { |
253 |
|
|
if (errno == ESRCH) |
254 |
|
|
break; |
255 |
|
|
goto restart; |
256 |
|
|
} |
257 |
|
|
if (i > 5) { |
258 |
|
|
warnx("WARNING: some process(es) wouldn't die"); |
259 |
|
|
break; |
260 |
|
|
} |
261 |
|
|
sleep_while_procs(2 * i); |
262 |
|
|
} |
263 |
|
|
|
264 |
|
|
reboot(howto); |
265 |
|
|
/* FALLTHROUGH */ |
266 |
|
|
|
267 |
|
|
restart: |
268 |
|
|
errx(1, kill(1, SIGHUP) == -1 ? "(can't restart init): " : ""); |
269 |
|
|
/* NOTREACHED */ |
270 |
|
|
} |
271 |
|
|
|
272 |
|
|
void |
273 |
|
|
usage(void) |
274 |
|
|
{ |
275 |
|
|
fprintf(stderr, "usage: %s [-dn%sq]\n", __progname, |
276 |
|
|
dohalt ? "p" : ""); |
277 |
|
|
exit(1); |
278 |
|
|
} |