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po: Update German man pages translation
[dpkg.git] / utils / start-stop-daemon.c
blob8899f0c036c57124aad56a02c2bacd1b34c4710f
1 /*
2 * A rewrite of the original Debian's start-stop-daemon Perl script
3 * in C (faster - it is executed many times during system startup).
4 *
5 * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
6 * public domain. Based conceptually on start-stop-daemon.pl, by Ian
7 * Jackson <ijackson@gnu.ai.mit.edu>. May be used and distributed
8 * freely for any purpose. Changes by Christian Schwarz
9 * <schwarz@monet.m.isar.de>, to make output conform to the Debian
10 * Console Message Standard, also placed in public domain. Minor
11 * changes by Klee Dienes <klee@debian.org>, also placed in the Public
12 * Domain.
13 *
14 * Changes by Ben Collins <bcollins@debian.org>, added --chuid, --background
15 * and --make-pidfile options, placed in public domain as well.
16 *
17 * Port to OpenBSD by Sontri Tomo Huynh <huynh.29@osu.edu>
18 * and Andreas Schuldei <andreas@schuldei.org>
19 *
20 * Changes by Ian Jackson: added --retry (and associated rearrangements).
21 */
22
23 #include <config.h>
24 /* On at least Solaris <= 11.3 procfs is not compatible with LFS. */
25 #if !DPKG_STRUCTURED_PROCFS_SUPPORTS_LFS
26 #undef _FILE_OFFSET_BITS
27 #endif
28 #include <compat.h>
29
30 #include <dpkg/macros.h>
31
32 #if defined(__linux__)
33 # define OS_Linux
34 #elif defined(__GNU__)
35 # define OS_Hurd
36 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
37 # define OS_FreeBSD
38 #elif defined(__NetBSD__)
39 # define OS_NetBSD
40 #elif defined(__OpenBSD__)
41 # define OS_OpenBSD
42 #elif defined(__DragonFly__)
43 # define OS_DragonFlyBSD
44 #elif defined(__APPLE__) && defined(__MACH__)
45 # define OS_Darwin
46 #elif defined(__sun)
47 # define OS_Solaris
48 #elif defined(_AIX)
49 # define OS_AIX
50 #elif defined(__hpux)
51 # define OS_HPUX
52 #else
53 # error Unknown architecture - cannot build start-stop-daemon
54 #endif
55
56 #if defined(OS_NetBSD)
57 /* NetBSD needs this to expose struct proc. */
58 #define _KMEMUSER 1
59 #elif defined(OS_Solaris)
60 /* Solaris needs this to expose the new structured procfs API. */
61 #define _STRUCTURED_PROC 1
62 #endif
63
64 #ifdef HAVE_SYS_PARAM_H
65 #include <sys/param.h>
66 #endif
67 #ifdef HAVE_SYS_SYSCALL_H
68 #include <sys/syscall.h>
69 #endif
70 #ifdef HAVE_SYS_SYSCTL_H
71 #include <sys/sysctl.h>
72 #endif
73 #ifdef HAVE_SYS_PROCFS_H
74 #include <sys/procfs.h>
75 #endif
76 #ifdef HAVE_SYS_PROC_H
77 #include <sys/proc.h>
78 #endif
79 #ifdef HAVE_SYS_USER_H
80 #include <sys/user.h>
81 #endif
82 #ifdef HAVE_SYS_PSTAT_H
83 #include <sys/pstat.h>
84 #endif
85 #include <sys/types.h>
86 #include <sys/time.h>
87 #include <sys/stat.h>
88 #include <sys/wait.h>
89 #include <sys/select.h>
90 #include <sys/ioctl.h>
91 #include <sys/socket.h>
92 #include <sys/un.h>
93
94 #include <errno.h>
95 #include <limits.h>
96 #include <time.h>
97 #include <fcntl.h>
98 #include <dirent.h>
99 #include <ctype.h>
100 #include <string.h>
101 #include <pwd.h>
102 #include <grp.h>
103 #include <signal.h>
104 #include <termios.h>
105 #include <unistd.h>
106 #include <stddef.h>
107 #include <stdbool.h>
108 #include <stdarg.h>
109 #include <stdlib.h>
110 #include <stdio.h>
111 #include <getopt.h>
112 #ifdef HAVE_ERROR_H
113 #include <error.h>
114 #endif
115 #ifdef HAVE_ERR_H
116 #include <err.h>
117 #endif
118
119 #if defined(OS_Hurd)
120 #include <hurd.h>
121 #include <ps.h>
122 #endif
123
124 #if defined(OS_Darwin)
125 #include <libproc.h>
126 #endif
127
128 #ifdef HAVE_KVM_H
129 #include <kvm.h>
130 #if defined(OS_FreeBSD)
131 #define KVM_MEMFILE "/dev/null"
132 #else
133 #define KVM_MEMFILE NULL
134 #endif
135 #endif
136
137 #if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0
138 #include <sched.h>
139 #else
140 #define SCHED_OTHER -1
141 #define SCHED_FIFO -1
142 #define SCHED_RR -1
143 #endif
144
145 /* At least macOS and AIX do not define this. */
146 #ifndef SOCK_NONBLOCK
147 #define SOCK_NONBLOCK 0
148 #endif
149
150 #if defined(OS_Linux)
151 /* This comes from TASK_COMM_LEN defined in Linux' include/linux/sched.h. */
152 #define PROCESS_NAME_SIZE 15
153 #elif defined(OS_Solaris)
154 #define PROCESS_NAME_SIZE 15
155 #elif defined(OS_Darwin)
156 #define PROCESS_NAME_SIZE 16
157 #elif defined(OS_AIX)
158 /* This comes from PRFNSZ defined in AIX's <sys/procfs.h>. */
159 #define PROCESS_NAME_SIZE 16
160 #elif defined(OS_NetBSD)
161 #define PROCESS_NAME_SIZE 16
162 #elif defined(OS_OpenBSD)
163 #define PROCESS_NAME_SIZE 16
164 #elif defined(OS_FreeBSD)
165 #define PROCESS_NAME_SIZE 19
166 #elif defined(OS_DragonFlyBSD)
167 /* On DragonFlyBSD MAXCOMLEN expands to 16. */
168 #define PROCESS_NAME_SIZE MAXCOMLEN
169 #endif
170
171 #if defined(SYS_ioprio_set) && defined(linux)
172 #define HAVE_IOPRIO_SET
173 #endif
174
175 #define IOPRIO_CLASS_SHIFT 13
176 #define IOPRIO_PRIO_VALUE(class, prio) (((class) << IOPRIO_CLASS_SHIFT) | (prio))
177 #define IO_SCHED_PRIO_MIN 0
178 #define IO_SCHED_PRIO_MAX 7
179
180 enum {
181 IOPRIO_WHO_PROCESS = 1,
182 IOPRIO_WHO_PGRP,
183 IOPRIO_WHO_USER,
184 };
185
186 enum {
187 IOPRIO_CLASS_NONE,
188 IOPRIO_CLASS_RT,
189 IOPRIO_CLASS_BE,
190 IOPRIO_CLASS_IDLE,
191 };
192
193 enum action_code {
194 ACTION_NONE,
195 ACTION_START,
196 ACTION_STOP,
197 ACTION_STATUS,
198 };
199
200 enum LIBCOMPAT_ATTR_ENUM_FLAGS match_code {
201 MATCH_NONE = 0,
202 MATCH_PID = 1 << 0,
203 MATCH_PPID = 1 << 1,
204 MATCH_PIDFILE = 1 << 2,
205 MATCH_EXEC = 1 << 3,
206 MATCH_NAME = 1 << 4,
207 MATCH_USER = 1 << 5,
208 };
209
210 /* Time conversion constants. */
211 enum {
212 NANOSEC_IN_SEC = 1000000000L,
213 NANOSEC_IN_MILLISEC = 1000000L,
214 NANOSEC_IN_MICROSEC = 1000L,
215 };
216
217 /* The minimum polling interval, 20ms. */
218 static const long MIN_POLL_INTERVAL = 20L * NANOSEC_IN_MILLISEC;
219
220 static enum action_code action;
221 static enum match_code match_mode;
222 static bool testmode = false;
223 static int quietmode = 0;
224 static int exitnodo = 1;
225 static bool background = false;
226 static bool close_io = true;
227 static const char *output_io;
228 static bool notify_await = false;
229 static int notify_timeout = 60;
230 static char *notify_sockdir;
231 static char *notify_socket;
232 static bool mpidfile = false;
233 static bool rpidfile = false;
234 static int signal_nr = SIGTERM;
235 static int user_id = -1;
236 static int runas_uid = -1;
237 static int runas_gid = -1;
238 static const char *userspec = NULL;
239 static char *changeuser = NULL;
240 static const char *changegroup = NULL;
241 static char *changeroot = NULL;
242 static const char *changedir = "/";
243 static const char *cmdname = NULL;
244 static char *execname = NULL;
245 static char *startas = NULL;
246 static pid_t match_pid = -1;
247 static pid_t match_ppid = -1;
248 static const char *pidfile = NULL;
249 static char *what_stop = NULL;
250 static const char *progname = "";
251 static int nicelevel = 0;
252 static int umask_value = -1;
253
254 static struct stat exec_stat;
255 #if defined(OS_Hurd)
256 static struct proc_stat_list *procset = NULL;
257 #endif
258
259 /* LSB Init Script process status exit codes. */
260 enum status_code {
261 STATUS_OK = 0,
262 STATUS_DEAD_PIDFILE = 1,
263 STATUS_DEAD_LOCKFILE = 2,
264 STATUS_DEAD = 3,
265 STATUS_UNKNOWN = 4,
266 };
267
268 struct pid_list {
269 struct pid_list *next;
270 pid_t pid;
271 };
272
273 static struct pid_list *found = NULL;
274 static struct pid_list *killed = NULL;
275
276 /* Resource scheduling policy. */
277 struct res_schedule {
278 const char *policy_name;
279 int policy;
280 int priority;
281 };
282
283 struct schedule_item {
284 enum {
285 sched_timeout,
286 sched_signal,
287 sched_goto,
288 /* Only seen within parse_schedule and callees. */
289 sched_forever,
290 } type;
291 /* Seconds, signal no., or index into array. */
292 int value;
293 };
294
295 static struct res_schedule *proc_sched = NULL;
296 static struct res_schedule *io_sched = NULL;
297
298 static int schedule_length;
299 static struct schedule_item *schedule = NULL;
300
301
302 static void LIBCOMPAT_ATTR_PRINTF(1)
303 debug(const char *format, ...)
304 {
305 va_list arglist;
306
307 if (quietmode >= 0)
308 return;
309
310 va_start(arglist, format);
311 vprintf(format, arglist);
312 va_end(arglist);
313 }
314
315 static void LIBCOMPAT_ATTR_PRINTF(1)
316 info(const char *format, ...)
317 {
318 va_list arglist;
319
320 if (quietmode > 0)
321 return;
322
323 va_start(arglist, format);
324 vprintf(format, arglist);
325 va_end(arglist);
326 }
327
328 static void LIBCOMPAT_ATTR_PRINTF(1)
329 warning(const char *format, ...)
330 {
331 va_list arglist;
332
333 fprintf(stderr, "%s: warning: ", progname);
334 va_start(arglist, format);
335 vfprintf(stderr, format, arglist);
336 va_end(arglist);
337 }
338
339 static void LIBCOMPAT_ATTR_NORET LIBCOMPAT_ATTR_VPRINTF(2)
340 fatalv(int errno_fatal, const char *format, va_list args)
341 {
342 va_list args_copy;
343
344 fprintf(stderr, "%s: ", progname);
345 va_copy(args_copy, args);
346 vfprintf(stderr, format, args_copy);
347 va_end(args_copy);
348 if (errno_fatal)
349 fprintf(stderr, " (%s)\n", strerror(errno_fatal));
350 else
351 fprintf(stderr, "\n");
352
353 if (action == ACTION_STATUS)
354 exit(STATUS_UNKNOWN);
355 else
356 exit(2);
357 }
358
359 static void LIBCOMPAT_ATTR_NORET LIBCOMPAT_ATTR_PRINTF(1)
360 fatal(const char *format, ...)
361 {
362 va_list args;
363
364 va_start(args, format);
365 fatalv(0, format, args);
366 /* cppcheck-suppress[va_end_missing]:
367 * False positive, fatalv() is non-returning. */
368 }
369
370 static void LIBCOMPAT_ATTR_NORET LIBCOMPAT_ATTR_PRINTF(1)
371 fatale(const char *format, ...)
372 {
373 va_list args;
374
375 va_start(args, format);
376 fatalv(errno, format, args);
377 /* cppcheck-suppress[va_end_missing]:
378 * False positive, fatalv() is non-returning. */
379 }
380
381 #define BUG(...) bug(__FILE__, __LINE__, __func__, __VA_ARGS__)
382
383 static void LIBCOMPAT_ATTR_NORET LIBCOMPAT_ATTR_PRINTF(4)
384 bug(const char *file, int line, const char *func, const char *format, ...)
385 {
386 va_list arglist;
387
388 fprintf(stderr, "%s:%s:%d:%s: internal error: ",
389 progname, file, line, func);
390 va_start(arglist, format);
391 vfprintf(stderr, format, arglist);
392 va_end(arglist);
393
394 if (action == ACTION_STATUS)
395 exit(STATUS_UNKNOWN);
396 else
397 exit(3);
398 }
399
400 static void *
401 xmalloc(int size)
402 {
403 void *ptr;
404
405 ptr = malloc(size);
406 if (ptr)
407 return ptr;
408 fatale("malloc(%d) failed", size);
409 }
410
411 static char *
412 xstrndup(const char *str, size_t n)
413 {
414 char *new_str;
415
416 new_str = strndup(str, n);
417 if (new_str)
418 return new_str;
419 fatale("strndup(%s, %zu) failed", str, n);
420 }
421
422 static void
423 timespec_gettime(struct timespec *ts)
424 {
425 #if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && \
426 defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK > 0
427 if (clock_gettime(CLOCK_MONOTONIC, ts) < 0)
428 fatale("clock_gettime failed");
429 #else
430 struct timeval tv;
431
432 if (gettimeofday(&tv, NULL) != 0)
433 fatale("gettimeofday failed");
434
435 ts->tv_sec = tv.tv_sec;
436 ts->tv_nsec = tv.tv_usec * NANOSEC_IN_MICROSEC;
437 #endif
438 }
439
440 #define timespec_cmp(a, b, OP) \
441 (((a)->tv_sec == (b)->tv_sec) ? \
442 ((a)->tv_nsec OP (b)->tv_nsec) : \
443 ((a)->tv_sec OP (b)->tv_sec))
444
445 static void
446 timespec_sub(struct timespec *a, struct timespec *b, struct timespec *res)
447 {
448 res->tv_sec = a->tv_sec - b->tv_sec;
449 res->tv_nsec = a->tv_nsec - b->tv_nsec;
450 if (res->tv_nsec < 0) {
451 res->tv_sec--;
452 res->tv_nsec += NANOSEC_IN_SEC;
453 }
454 }
455
456 static void
457 timespec_mul(struct timespec *a, int b)
458 {
459 long nsec = a->tv_nsec * b;
460
461 a->tv_sec *= b;
462 a->tv_sec += nsec / NANOSEC_IN_SEC;
463 a->tv_nsec = nsec % NANOSEC_IN_SEC;
464 }
465
466 static char *
467 newpath(const char *dirname, const char *filename)
468 {
469 char *path;
470 size_t path_len;
471
472 path_len = strlen(dirname) + 1 + strlen(filename) + 1;
473 path = xmalloc(path_len);
474 snprintf(path, path_len, "%s/%s", dirname, filename);
475
476 return path;
477 }
478
479 static int
480 parse_unsigned(const char *string, int base, int *value_r)
481 {
482 long value;
483 char *endptr;
484
485 errno = 0;
486 if (!string[0])
487 return -1;
488
489 value = strtol(string, &endptr, base);
490 if (string == endptr || *endptr != '\0' || errno != 0)
491 return -1;
492 if (value < 0 || value > INT_MAX)
493 return -1;
494
495 *value_r = value;
496 return 0;
497 }
498
499 static long
500 get_open_fd_max(void)
501 {
502 #ifdef HAVE_GETDTABLESIZE
503 return getdtablesize();
504 #else
505 return sysconf(_SC_OPEN_MAX);
506 #endif
507 }
508
509 #ifndef HAVE_SETSID
510 static void
511 detach_controlling_tty(void)
512 {
513 #ifdef HAVE_TIOCNOTTY
514 int tty_fd;
515
516 tty_fd = open("/dev/tty", O_RDWR);
517
518 /* The current process does not have a controlling tty. */
519 if (tty_fd < 0)
520 return;
521
522 if (ioctl(tty_fd, TIOCNOTTY, 0) != 0)
523 fatale("unable to detach controlling tty");
524
525 close(tty_fd);
526 #endif
527 }
528
529 static pid_t
530 setsid(void)
531 {
532 if (setpgid(0, 0) < 0)
533 return -1:
534
535 detach_controlling_tty();
536
537 return 0;
538 }
539 #endif
540
541 static void
542 wait_for_child(pid_t pid)
543 {
544 pid_t child;
545 int status;
546
547 do {
548 child = waitpid(pid, &status, 0);
549 } while (child < 0 && errno == EINTR);
550
551 if (child != pid)
552 fatal("error waiting for child");
553
554 if (WIFEXITED(status)) {
555 int ret = WEXITSTATUS(status);
556
557 if (ret != 0)
558 fatal("child returned error exit status %d", ret);
559 } else if (WIFSIGNALED(status)) {
560 int signo = WTERMSIG(status);
561
562 fatal("child was killed by signal %d", signo);
563 } else {
564 fatal("unexpected status %d waiting for child", status);
565 }
566 }
567
568 static void
569 cleanup_socket_dir(void)
570 {
571 (void)unlink(notify_socket);
572 (void)rmdir(notify_sockdir);
573 }
574
575 static char *
576 setup_socket_name(const char *suffix)
577 {
578 const char *basedir;
579
580 if (getuid() == 0 && access(RUNSTATEDIR, F_OK) == 0) {
581 basedir = RUNSTATEDIR;
582 } else {
583 basedir = getenv("TMPDIR");
584 if (basedir == NULL)
585 basedir = P_tmpdir;
586 }
587
588 if (asprintf(&notify_sockdir, "%s/%s.XXXXXX", basedir, suffix) < 0)
589 fatale("cannot allocate socket directory name");
590
591 if (mkdtemp(notify_sockdir) == NULL)
592 fatale("cannot create socket directory %s", notify_sockdir);
593
594 atexit(cleanup_socket_dir);
595
596 if (chown(notify_sockdir, runas_uid, runas_gid))
597 fatale("cannot change socket directory ownership");
598
599 if (asprintf(&notify_socket, "%s/notify", notify_sockdir) < 0)
600 fatale("cannot allocate socket name");
601
602 setenv("NOTIFY_SOCKET", notify_socket, 1);
603
604 return notify_socket;
605 }
606
607 static void
608 set_socket_passcred(int fd)
609 {
610 #ifdef SO_PASSCRED
611 static const int enable = 1;
612
613 (void)setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable));
614 #endif
615 }
616
617 static int
618 create_notify_socket(void)
619 {
620 const char *sockname;
621 struct sockaddr_un su;
622 int fd, rc, flags;
623
624 /* Create notification socket. */
625 fd = socket(AF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK, 0);
626 if (fd < 0)
627 fatale("cannot create notification socket");
628
629 /* We could set SOCK_CLOEXEC instead, but then we would need to
630 * check whether the socket call failed, try and then do this anyway,
631 * when we have no threading problems to worry about. */
632 flags = fcntl(fd, F_GETFD);
633 if (flags < 0)
634 fatale("cannot read fd flags for notification socket");
635 if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0)
636 fatale("cannot set close-on-exec flag for notification socket");
637
638 sockname = setup_socket_name(".s-s-d-notify");
639
640 /* Bind to a socket in a temporary directory, selected based on
641 * the platform. */
642 memset(&su, 0, sizeof(su));
643 su.sun_family = AF_UNIX;
644 strncpy(su.sun_path, sockname, sizeof(su.sun_path) - 1);
645
646 rc = bind(fd, (struct sockaddr *)&su, sizeof(su));
647 if (rc < 0)
648 fatale("cannot bind to notification socket");
649
650 rc = chmod(su.sun_path, 0660);
651 if (rc < 0)
652 fatale("cannot change notification socket permissions");
653
654 rc = chown(su.sun_path, runas_uid, runas_gid);
655 if (rc < 0)
656 fatale("cannot change notification socket ownership");
657
658 /* XXX: Verify we are talking to an expected child? Although it is not
659 * clear whether this is feasible given the knowledge we have got. */
660 set_socket_passcred(fd);
661
662 return fd;
663 }
664
665 static void
666 wait_for_notify(int fd)
667 {
668 struct timespec startat, now, elapsed, timeout, timeout_orig;
669 fd_set fdrs;
670
671 timeout.tv_sec = notify_timeout;
672 timeout.tv_nsec = 0;
673 timeout_orig = timeout;
674
675 timespec_gettime(&startat);
676
677 while (timeout.tv_sec >= 0 && timeout.tv_nsec >= 0) {
678 int rc;
679
680 FD_ZERO(&fdrs);
681 FD_SET(fd, &fdrs);
682
683 /* Wait for input. */
684 debug("Waiting for notifications... (timeout %lusec %lunsec)\n",
685 timeout.tv_sec, timeout.tv_nsec);
686 rc = pselect(fd + 1, &fdrs, NULL, NULL, &timeout, NULL);
687
688 /* Catch non-restartable errors, that is, not signals nor
689 * kernel out of resources. */
690 if (rc < 0 && (errno != EINTR && errno != EAGAIN))
691 fatale("cannot monitor notification socket for activity");
692
693 /* Timed-out. */
694 if (rc == 0)
695 fatal("timed out waiting for a notification");
696
697 /* Update the timeout, as should not rely on pselect() having
698 * done that for us, which is an unportable assumption. */
699 timespec_gettime(&now);
700 timespec_sub(&now, &startat, &elapsed);
701 timespec_sub(&timeout_orig, &elapsed, &timeout);
702
703 /* Restartable error, a signal or kernel out of resources. */
704 if (rc < 0)
705 continue;
706
707 /* Parse it and check for a supported notification message,
708 * once we get a READY=1, we exit. */
709 for (;;) {
710 ssize_t nrecv;
711 char buf[4096];
712 char *line, *line_next;
713
714 nrecv = recv(fd, buf, sizeof(buf), 0);
715 if (nrecv < 0 && (errno != EINTR && errno != EAGAIN))
716 fatale("cannot receive notification packet");
717 if (nrecv < 0)
718 break;
719
720 buf[nrecv] = '\0';
721
722 for (line = buf; *line; line = line_next) {
723 line_next = strchrnul(line, '\n');
724 if (*line_next == '\n')
725 *line_next++ = '\0';
726
727 debug("Child sent some notification...\n");
728 if (strncmp(line, "EXTEND_TIMEOUT_USEC=", 20) == 0) {
729 int extend_usec = 0;
730
731 if (parse_unsigned(line + 20, 10, &extend_usec) != 0)
732 fatale("cannot parse extended timeout notification %s", line);
733
734 /* Reset the current timeout. */
735 timeout.tv_sec = extend_usec / 1000L;
736 timeout.tv_nsec = (extend_usec % 1000L) *
737 NANOSEC_IN_MILLISEC;
738 timeout_orig = timeout;
739
740 timespec_gettime(&startat);
741 } else if (strncmp(line, "ERRNO=", 6) == 0) {
742 int suberrno = 0;
743
744 if (parse_unsigned(line + 6, 10, &suberrno) != 0)
745 fatale("cannot parse errno notification %s", line);
746 errno = suberrno;
747 fatale("program failed to initialize");
748 } else if (strcmp(line, "READY=1") == 0) {
749 debug("-> Notification => ready for service.\n");
750 return;
751 } else {
752 debug("-> Notification line '%s' received\n", line);
753 }
754 }
755 }
756 }
757 }
758
759 static void
760 write_pidfile(const char *filename, pid_t pid)
761 {
762 FILE *fp;
763 int fd;
764
765 fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW, 0666);
766 if (fd < 0)
767 fp = NULL;
768 else
769 fp = fdopen(fd, "w");
770
771 if (fp == NULL)
772 fatale("unable to open pidfile '%s' for writing", filename);
773
774 fprintf(fp, "%d\n", pid);
775
776 if (fclose(fp))
777 fatale("unable to close pidfile '%s'", filename);
778 }
779
780 static void
781 remove_pidfile(const char *filename)
782 {
783 if (unlink(filename) < 0 && errno != ENOENT)
784 fatale("cannot remove pidfile '%s'", filename);
785 }
786
787 static void
788 daemonize(void)
789 {
790 int notify_fd = -1;
791 pid_t pid;
792 sigset_t mask;
793 sigset_t oldmask;
794
795 debug("Detaching to start %s...\n", startas);
796
797 /* Block SIGCHLD to allow waiting for the child process while it is
798 * performing actions, such as creating a pidfile. */
799 sigemptyset(&mask);
800 sigaddset(&mask, SIGCHLD);
801 if (sigprocmask(SIG_BLOCK, &mask, &oldmask) < 0)
802 fatale("cannot block SIGCHLD");
803
804 if (notify_await)
805 notify_fd = create_notify_socket();
806
807 pid = fork();
808 if (pid < 0)
809 fatale("unable to do first fork");
810 else if (pid) { /* First Parent. */
811 /* Wait for the second parent to exit, so that if we need to
812 * perform any actions there, like creating a pidfile, we do
813 * not suffer from race conditions on return. */
814 wait_for_child(pid);
815
816 if (notify_await) {
817 /* Wait for a readiness notification from the second
818 * child, so that we can safely exit when the service
819 * is up. */
820 wait_for_notify(notify_fd);
821 close(notify_fd);
822 cleanup_socket_dir();
823 }
824
825 _exit(0);
826 }
827
828 /* Close the notification socket, even though it is close-on-exec. */
829 if (notify_await)
830 close(notify_fd);
831
832 /* Create a new session. */
833 if (setsid() < 0)
834 fatale("cannot set session ID");
835
836 pid = fork();
837 if (pid < 0)
838 fatale("unable to do second fork");
839 else if (pid) { /* Second parent. */
840 /* Set a default umask for dumb programs, which might get
841 * overridden by the --umask option later on, so that we get
842 * a defined umask when creating the pidfile. */
843 umask(022);
844
845 if (mpidfile && pidfile != NULL)
846 /* User wants _us_ to make the pidfile. */
847 write_pidfile(pidfile, pid);
848
849 _exit(0);
850 }
851
852 if (sigprocmask(SIG_SETMASK, &oldmask, NULL) < 0)
853 fatale("cannot restore signal mask");
854
855 debug("Detaching complete...\n");
856 }
857
858 static void
859 pid_list_push(struct pid_list **list, pid_t pid)
860 {
861 struct pid_list *p;
862
863 p = xmalloc(sizeof(*p));
864 p->next = *list;
865 p->pid = pid;
866 *list = p;
867 }
868
869 static void
870 pid_list_free(struct pid_list **list)
871 {
872 struct pid_list *here, *next;
873
874 for (here = *list; here != NULL; here = next) {
875 next = here->next;
876 free(here);
877 }
878
879 *list = NULL;
880 }
881
882 static void
883 usage(void)
884 {
885 printf(
886 "Usage: start-stop-daemon [<option>...] <command>\n"
887 "\n");
888
889 printf(
890 "Commands:\n"
891 " -S, --start -- <argument>... start a program and pass <arguments> to it\n"
892 " -K, --stop stop a program\n"
893 " -T, --status get the program status\n"
894 " -H, --help print help information\n"
895 " -V, --version print version\n"
896 "\n");
897
898 printf(
899 "Matching options (at least one is required):\n"
900 " --pid <pid> pid to check\n"
901 " --ppid <ppid> parent pid to check\n"
902 " -p, --pidfile <pid-file> pid file to check\n"
903 " -x, --exec <executable> program to start/check if it is running\n"
904 " -n, --name <process-name> process name to check\n"
905 " -u, --user <username|uid> process owner to check\n"
906 "\n");
907
908 printf(
909 "Options:\n"
910 " -g, --group <group|gid> run process as this group\n"
911 " -c, --chuid <name|uid[:group|gid]>\n"
912 " change to this user/group before starting\n"
913 " process\n"
914 " -s, --signal <signal> signal to send (default TERM)\n"
915 " -a, --startas <pathname> program to start (default is <executable>)\n"
916 " -r, --chroot <directory> chroot to <directory> before starting\n"
917 " -d, --chdir <directory> change to <directory> (default is /)\n"
918 " -N, --nicelevel <incr> add incr to the process' nice level\n"
919 " -P, --procsched <policy[:prio]>\n"
920 " use <policy> with <prio> for the kernel\n"
921 " process scheduler (default prio is 0)\n"
922 " -I, --iosched <class[:prio]> use <class> with <prio> to set the IO\n"
923 " scheduler (default prio is 4)\n"
924 " -k, --umask <mask> change the umask to <mask> before starting\n"
925 " -b, --background force the process to detach\n"
926 " --notify-await wait for a readiness notification\n"
927 " --notify-timeout <int> timeout after <int> seconds of notify wait\n"
928 " -C, --no-close do not close any file descriptor\n"
929 " -O, --output <filename> send stdout and stderr to <filename>\n"
930 " -m, --make-pidfile create the pidfile before starting\n"
931 " --remove-pidfile delete the pidfile after stopping\n"
932 " -R, --retry <schedule> check whether processes die, and retry\n"
933 " -t, --test test mode, don't do anything\n"
934 " -o, --oknodo exit status 0 (not 1) if nothing done\n"
935 " -q, --quiet be more quiet\n"
936 " -v, --verbose be more verbose\n"
937 "\n");
938
939 printf(
940 "Retry <schedule> is <item>|/<item>/... where <item> is one of\n"
941 " -<signal-num>|[-]<signal-name> send that signal\n"
942 " <timeout> wait that many seconds\n"
943 " forever repeat remainder forever\n"
944 "or <schedule> may be just <timeout>, meaning <signal>/<timeout>/KILL/<timeout>\n"
945 "\n");
946
947 printf(
948 "The process scheduler <policy> can be one of:\n"
949 " other, fifo or rr\n"
950 "\n");
951
952 printf(
953 "The IO scheduler <class> can be one of:\n"
954 " real-time, best-effort or idle\n"
955 "\n");
956
957 printf(
958 "Exit status:\n"
959 " 0 = done\n"
960 " 1 = nothing done (=> 0 if --oknodo)\n"
961 " 2 = with --retry, processes would not die\n"
962 " 3 = trouble\n"
963 "Exit status with --status:\n"
964 " 0 = program is running\n"
965 " 1 = program is not running and the pid file exists\n"
966 " 3 = program is not running\n"
967 " 4 = unable to determine status\n");
968 }
969
970 static void
971 do_version(void)
972 {
973 printf("start-stop-daemon %s for Debian\n\n", VERSION);
974
975 printf("Written by Marek Michalkiewicz, public domain.\n");
976 }
977
978 static void LIBCOMPAT_ATTR_NORET
979 badusage(const char *msg)
980 {
981 if (msg)
982 fprintf(stderr, "%s: %s\n", progname, msg);
983 fprintf(stderr, "Try '%s --help' for more information.\n", progname);
984
985 if (action == ACTION_STATUS)
986 exit(STATUS_UNKNOWN);
987 else
988 exit(3);
989 }
990
991 struct sigpair {
992 const char *name;
993 int signal;
994 };
995
996 static const struct sigpair siglist[] = {
997 { "ABRT", SIGABRT },
998 { "ALRM", SIGALRM },
999 { "FPE", SIGFPE },
1000 { "HUP", SIGHUP },
1001 { "ILL", SIGILL },
1002 { "INT", SIGINT },
1003 { "KILL", SIGKILL },
1004 { "PIPE", SIGPIPE },
1005 { "QUIT", SIGQUIT },
1006 { "SEGV", SIGSEGV },
1007 { "TERM", SIGTERM },
1008 { "USR1", SIGUSR1 },
1009 { "USR2", SIGUSR2 },
1010 { "CHLD", SIGCHLD },
1011 { "CONT", SIGCONT },
1012 { "STOP", SIGSTOP },
1013 { "TSTP", SIGTSTP },
1014 { "TTIN", SIGTTIN },
1015 { "TTOU", SIGTTOU }
1016 };
1017
1018 static int
1019 parse_pid(const char *pid_str, int *pid_num)
1020 {
1021 if (parse_unsigned(pid_str, 10, pid_num) != 0)
1022 return -1;
1023 if (*pid_num == 0)
1024 return -1;
1025
1026 return 0;
1027 }
1028
1029 static int
1030 parse_signal(const char *sig_str, int *sig_num)
1031 {
1032 unsigned int i;
1033
1034 if (parse_unsigned(sig_str, 10, sig_num) == 0)
1035 return 0;
1036
1037 for (i = 0; i < array_count(siglist); i++) {
1038 if (strcmp(sig_str, siglist[i].name) == 0) {
1039 *sig_num = siglist[i].signal;
1040 return 0;
1041 }
1042 }
1043 return -1;
1044 }
1045
1046 static int
1047 parse_umask(const char *string, int *value_r)
1048 {
1049 return parse_unsigned(string, 0, value_r);
1050 }
1051
1052 static void
1053 validate_proc_schedule(void)
1054 {
1055 #if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0
1056 int prio_min, prio_max;
1057
1058 prio_min = sched_get_priority_min(proc_sched->policy);
1059 prio_max = sched_get_priority_max(proc_sched->policy);
1060
1061 if (proc_sched->priority < prio_min)
1062 badusage("process scheduler priority less than min");
1063 if (proc_sched->priority > prio_max)
1064 badusage("process scheduler priority greater than max");
1065 #endif
1066 }
1067
1068 static void
1069 parse_proc_schedule(const char *string)
1070 {
1071 char *policy_str;
1072 size_t policy_len;
1073 int prio = 0;
1074
1075 policy_len = strcspn(string, ":");
1076 policy_str = xstrndup(string, policy_len);
1077
1078 if (string[policy_len] == ':' &&
1079 parse_unsigned(string + policy_len + 1, 10, &prio) != 0)
1080 fatale("invalid process scheduler priority");
1081
1082 proc_sched = xmalloc(sizeof(*proc_sched));
1083 proc_sched->policy_name = policy_str;
1084
1085 if (strcmp(policy_str, "other") == 0) {
1086 proc_sched->policy = SCHED_OTHER;
1087 proc_sched->priority = 0;
1088 } else if (strcmp(policy_str, "fifo") == 0) {
1089 proc_sched->policy = SCHED_FIFO;
1090 proc_sched->priority = prio;
1091 } else if (strcmp(policy_str, "rr") == 0) {
1092 proc_sched->policy = SCHED_RR;
1093 proc_sched->priority = prio;
1094 } else
1095 badusage("invalid process scheduler policy");
1096
1097 validate_proc_schedule();
1098 }
1099
1100 static void
1101 parse_io_schedule(const char *string)
1102 {
1103 char *class_str;
1104 size_t class_len;
1105 int prio = 4;
1106
1107 class_len = strcspn(string, ":");
1108 class_str = xstrndup(string, class_len);
1109
1110 if (string[class_len] == ':' &&
1111 parse_unsigned(string + class_len + 1, 10, &prio) != 0)
1112 fatale("invalid IO scheduler priority");
1113
1114 io_sched = xmalloc(sizeof(*io_sched));
1115 io_sched->policy_name = class_str;
1116
1117 if (strcmp(class_str, "real-time") == 0) {
1118 io_sched->policy = IOPRIO_CLASS_RT;
1119 io_sched->priority = prio;
1120 } else if (strcmp(class_str, "best-effort") == 0) {
1121 io_sched->policy = IOPRIO_CLASS_BE;
1122 io_sched->priority = prio;
1123 } else if (strcmp(class_str, "idle") == 0) {
1124 io_sched->policy = IOPRIO_CLASS_IDLE;
1125 io_sched->priority = 7;
1126 } else
1127 badusage("invalid IO scheduler policy");
1128
1129 if (io_sched->priority < IO_SCHED_PRIO_MIN)
1130 badusage("IO scheduler priority less than min");
1131 if (io_sched->priority > IO_SCHED_PRIO_MAX)
1132 badusage("IO scheduler priority greater than max");
1133 }
1134
1135 static void
1136 set_proc_schedule(struct res_schedule *sched)
1137 {
1138 #if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0
1139 struct sched_param param;
1140
1141 param.sched_priority = sched->priority;
1142
1143 if (sched_setscheduler(getpid(), sched->policy, &param) < 0)
1144 fatale("unable to set process scheduler");
1145 #endif
1146 }
1147
1148 #ifdef HAVE_IOPRIO_SET
1149 static inline int
1150 ioprio_set(int which, int who, int ioprio)
1151 {
1152 return syscall(SYS_ioprio_set, which, who, ioprio);
1153 }
1154 #endif
1155
1156 static void
1157 set_io_schedule(struct res_schedule *sched)
1158 {
1159 #ifdef HAVE_IOPRIO_SET
1160 int io_sched_mask;
1161
1162 io_sched_mask = IOPRIO_PRIO_VALUE(sched->policy, sched->priority);
1163 if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), io_sched_mask) < 0)
1164 warning("unable to alter IO priority to mask %i (%s)\n",
1165 io_sched_mask, strerror(errno));
1166 #endif
1167 }
1168
1169 static void
1170 parse_schedule_item(const char *string, struct schedule_item *item)
1171 {
1172 const char *after_hyph;
1173
1174 if (strcmp(string, "forever") == 0) {
1175 item->type = sched_forever;
1176 } else if (isdigit(string[0])) {
1177 item->type = sched_timeout;
1178 if (parse_unsigned(string, 10, &item->value) != 0)
1179 badusage("invalid timeout value in schedule");
1180 } else if ((after_hyph = string + (string[0] == '-')) &&
1181 parse_signal(after_hyph, &item->value) == 0) {
1182 item->type = sched_signal;
1183 } else {
1184 badusage("invalid schedule item (must be [-]<signal-name>, "
1185 "-<signal-number>, <timeout> or 'forever'");
1186 }
1187 }
1188
1189 static void
1190 parse_schedule(const char *schedule_str)
1191 {
1192 const char *slash;
1193 int count;
1194
1195 count = 0;
1196 for (slash = schedule_str; *slash; slash++)
1197 if (*slash == '/')
1198 count++;
1199
1200 schedule_length = (count == 0) ? 4 : count + 1;
1201 schedule = xmalloc(sizeof(*schedule) * schedule_length);
1202
1203 if (count == 0) {
1204 schedule[0].type = sched_signal;
1205 schedule[0].value = signal_nr;
1206 parse_schedule_item(schedule_str, &schedule[1]);
1207 if (schedule[1].type != sched_timeout) {
1208 badusage("--retry takes timeout, or schedule list"
1209 " of at least two items");
1210 }
1211 schedule[2].type = sched_signal;
1212 schedule[2].value = SIGKILL;
1213 schedule[3] = schedule[1];
1214 } else {
1215 int repeatat;
1216
1217 count = 0;
1218 repeatat = -1;
1219 while (*schedule_str) {
1220 char item_buf[20];
1221 size_t str_len;
1222
1223 slash = strchrnul(schedule_str, '/');
1224 str_len = (size_t)(slash - schedule_str);
1225 if (str_len >= sizeof(item_buf))
1226 badusage("invalid schedule item: far too long"
1227 " (you must delimit items with slashes)");
1228 memcpy(item_buf, schedule_str, str_len);
1229 item_buf[str_len] = '\0';
1230 schedule_str = *slash ? slash + 1 : slash;
1231
1232 parse_schedule_item(item_buf, &schedule[count]);
1233 if (schedule[count].type == sched_forever) {
1234 if (repeatat >= 0)
1235 badusage("invalid schedule: 'forever'"
1236 " appears more than once");
1237 repeatat = count;
1238 continue;
1239 }
1240 count++;
1241 }
1242 if (repeatat == count)
1243 badusage("invalid schedule: 'forever' appears last, "
1244 "nothing to repeat");
1245 if (repeatat >= 0) {
1246 schedule[count].type = sched_goto;
1247 schedule[count].value = repeatat;
1248 count++;
1249 }
1250 if (count != schedule_length)
1251 BUG("count=%d != schedule_length=%d",
1252 count, schedule_length);
1253 }
1254 }
1255
1256 static void
1257 set_action(enum action_code new_action)
1258 {
1259 if (action == new_action)
1260 return;
1261
1262 if (action != ACTION_NONE)
1263 badusage("only one command can be specified");
1264
1265 action = new_action;
1266 }
1267
1268 #define OPT_PID 500
1269 #define OPT_PPID 501
1270 #define OPT_RM_PIDFILE 502
1271 #define OPT_NOTIFY_AWAIT 503
1272 #define OPT_NOTIFY_TIMEOUT 504
1273
1274 static void
1275 parse_options(int argc, char * const *argv)
1276 {
1277 static struct option longopts[] = {
1278 { "help", 0, NULL, 'H'},
1279 { "stop", 0, NULL, 'K'},
1280 { "start", 0, NULL, 'S'},
1281 { "status", 0, NULL, 'T'},
1282 { "version", 0, NULL, 'V'},
1283 { "startas", 1, NULL, 'a'},
1284 { "name", 1, NULL, 'n'},
1285 { "oknodo", 0, NULL, 'o'},
1286 { "pid", 1, NULL, OPT_PID},
1287 { "ppid", 1, NULL, OPT_PPID},
1288 { "pidfile", 1, NULL, 'p'},
1289 { "quiet", 0, NULL, 'q'},
1290 { "signal", 1, NULL, 's'},
1291 { "test", 0, NULL, 't'},
1292 { "user", 1, NULL, 'u'},
1293 { "group", 1, NULL, 'g'},
1294 { "chroot", 1, NULL, 'r'},
1295 { "verbose", 0, NULL, 'v'},
1296 { "exec", 1, NULL, 'x'},
1297 { "chuid", 1, NULL, 'c'},
1298 { "nicelevel", 1, NULL, 'N'},
1299 { "procsched", 1, NULL, 'P'},
1300 { "iosched", 1, NULL, 'I'},
1301 { "umask", 1, NULL, 'k'},
1302 { "background", 0, NULL, 'b'},
1303 { "notify-await", 0, NULL, OPT_NOTIFY_AWAIT},
1304 { "notify-timeout", 1, NULL, OPT_NOTIFY_TIMEOUT},
1305 { "no-close", 0, NULL, 'C'},
1306 { "output", 1, NULL, 'O'},
1307 { "make-pidfile", 0, NULL, 'm'},
1308 { "remove-pidfile", 0, NULL, OPT_RM_PIDFILE},
1309 { "retry", 1, NULL, 'R'},
1310 { "chdir", 1, NULL, 'd'},
1311 { NULL, 0, NULL, 0 }
1312 };
1313 const char *pid_str = NULL;
1314 const char *ppid_str = NULL;
1315 const char *umask_str = NULL;
1316 const char *signal_str = NULL;
1317 const char *schedule_str = NULL;
1318 const char *proc_schedule_str = NULL;
1319 const char *io_schedule_str = NULL;
1320 const char *notify_timeout_str = NULL;
1321 size_t changeuser_len;
1322 int c;
1323
1324 for (;;) {
1325 c = getopt_long(argc, argv,
1326 "HKSVTa:n:op:qr:s:tu:vx:c:N:P:I:k:bCO:mR:g:d:",
1327 longopts, NULL);
1328 if (c == -1)
1329 break;
1330 switch (c) {
1331 case 'H': /* --help */
1332 usage();
1333 exit(0);
1334 case 'K': /* --stop */
1335 set_action(ACTION_STOP);
1336 break;
1337 case 'S': /* --start */
1338 set_action(ACTION_START);
1339 break;
1340 case 'T': /* --status */
1341 set_action(ACTION_STATUS);
1342 break;
1343 case 'V': /* --version */
1344 do_version();
1345 exit(0);
1346 case 'a': /* --startas <pathname> */
1347 startas = optarg;
1348 break;
1349 case 'n': /* --name <process-name> */
1350 match_mode |= MATCH_NAME;
1351 cmdname = optarg;
1352 break;
1353 case 'o': /* --oknodo */
1354 exitnodo = 0;
1355 break;
1356 case OPT_PID: /* --pid <pid> */
1357 match_mode |= MATCH_PID;
1358 pid_str = optarg;
1359 break;
1360 case OPT_PPID: /* --ppid <ppid> */
1361 match_mode |= MATCH_PPID;
1362 ppid_str = optarg;
1363 break;
1364 case 'p': /* --pidfile <pid-file> */
1365 match_mode |= MATCH_PIDFILE;
1366 pidfile = optarg;
1367 break;
1368 case 'q': /* --quiet */
1369 quietmode = true;
1370 break;
1371 case 's': /* --signal <signal> */
1372 signal_str = optarg;
1373 break;
1374 case 't': /* --test */
1375 testmode = true;
1376 break;
1377 case 'u': /* --user <username>|<uid> */
1378 match_mode |= MATCH_USER;
1379 userspec = optarg;
1380 break;
1381 case 'v': /* --verbose */
1382 quietmode = -1;
1383 break;
1384 case 'x': /* --exec <executable> */
1385 match_mode |= MATCH_EXEC;
1386 execname = optarg;
1387 break;
1388 case 'c': /* --chuid <username>|<uid> */
1389 free(changeuser);
1390 /* We copy the string just in case we need the
1391 * argument later. */
1392 changeuser_len = strcspn(optarg, ":");
1393 changeuser = xstrndup(optarg, changeuser_len);
1394 if (optarg[changeuser_len] == ':') {
1395 if (optarg[changeuser_len + 1] == '\0')
1396 fatal("missing group name");
1397 changegroup = optarg + changeuser_len + 1;
1398 }
1399 break;
1400 case 'g': /* --group <group>|<gid> */
1401 changegroup = optarg;
1402 break;
1403 case 'r': /* --chroot /new/root */
1404 changeroot = optarg;
1405 break;
1406 case 'N': /* --nice */
1407 nicelevel = atoi(optarg);
1408 break;
1409 case 'P': /* --procsched */
1410 proc_schedule_str = optarg;
1411 break;
1412 case 'I': /* --iosched */
1413 io_schedule_str = optarg;
1414 break;
1415 case 'k': /* --umask <mask> */
1416 umask_str = optarg;
1417 break;
1418 case 'b': /* --background */
1419 background = true;
1420 break;
1421 case OPT_NOTIFY_AWAIT:
1422 notify_await = true;
1423 break;
1424 case OPT_NOTIFY_TIMEOUT:
1425 notify_timeout_str = optarg;
1426 break;
1427 case 'C': /* --no-close */
1428 close_io = false;
1429 break;
1430 case 'O': /* --outout <filename> */
1431 output_io = optarg;
1432 break;
1433 case 'm': /* --make-pidfile */
1434 mpidfile = true;
1435 break;
1436 case OPT_RM_PIDFILE: /* --remove-pidfile */
1437 rpidfile = true;
1438 break;
1439 case 'R': /* --retry <schedule>|<timeout> */
1440 schedule_str = optarg;
1441 break;
1442 case 'd': /* --chdir /new/dir */
1443 changedir = optarg;
1444 break;
1445 default:
1446 /* Message printed by getopt. */
1447 badusage(NULL);
1448 }
1449 }
1450
1451 if (pid_str != NULL) {
1452 if (parse_pid(pid_str, &match_pid) != 0)
1453 badusage("pid value must be a number greater than 0");
1454 }
1455
1456 if (ppid_str != NULL) {
1457 if (parse_pid(ppid_str, &match_ppid) != 0)
1458 badusage("ppid value must be a number greater than 0");
1459 }
1460
1461 if (signal_str != NULL) {
1462 if (parse_signal(signal_str, &signal_nr) != 0)
1463 badusage("signal value must be numeric or name"
1464 " of signal (KILL, INT, ...)");
1465 }
1466
1467 if (schedule_str != NULL) {
1468 parse_schedule(schedule_str);
1469 }
1470
1471 if (proc_schedule_str != NULL)
1472 parse_proc_schedule(proc_schedule_str);
1473
1474 if (io_schedule_str != NULL)
1475 parse_io_schedule(io_schedule_str);
1476
1477 if (umask_str != NULL) {
1478 if (parse_umask(umask_str, &umask_value) != 0)
1479 badusage("umask value must be a positive number");
1480 }
1481
1482 if (output_io != NULL && output_io[0] != '/')
1483 badusage("--output file needs to be an absolute filename");
1484
1485 if (notify_timeout_str != NULL)
1486 if (parse_unsigned(notify_timeout_str, 10, &notify_timeout) != 0)
1487 badusage("invalid notify timeout value");
1488
1489 if (action == ACTION_NONE)
1490 badusage("need one of --start or --stop or --status");
1491
1492 if (match_mode == MATCH_NONE ||
1493 (!execname && !cmdname && !userspec &&
1494 !pid_str && !ppid_str && !pidfile))
1495 badusage("need at least one of --exec, --pid, --ppid, --pidfile, --user or --name");
1496
1497 #ifdef PROCESS_NAME_SIZE
1498 if (cmdname && strlen(cmdname) > PROCESS_NAME_SIZE)
1499 warning("this system is not able to track process names\n"
1500 "longer than %d characters, please use --exec "
1501 "instead of --name.\n", PROCESS_NAME_SIZE);
1502 #endif
1503
1504 if (!startas)
1505 startas = execname;
1506
1507 if (action == ACTION_START && !startas)
1508 badusage("--start needs --exec or --startas");
1509
1510 if (mpidfile && pidfile == NULL)
1511 badusage("--make-pidfile requires --pidfile");
1512 if (rpidfile && pidfile == NULL)
1513 badusage("--remove-pidfile requires --pidfile");
1514
1515 if (pid_str && pidfile)
1516 badusage("need either --pid or --pidfile, not both");
1517
1518 if (background && action != ACTION_START)
1519 badusage("--background is only relevant with --start");
1520
1521 if (!close_io && !background)
1522 badusage("--no-close is only relevant with --background");
1523 if (output_io && !background)
1524 badusage("--output is only relevant with --background");
1525
1526 if (close_io && output_io == NULL)
1527 output_io = "/dev/null";
1528 }
1529
1530 static void
1531 setup_options(void)
1532 {
1533 if (execname) {
1534 char *fullexecname;
1535
1536 /* If it's a relative path, normalize it. */
1537 if (execname[0] != '/')
1538 execname = newpath(changedir, execname);
1539
1540 if (changeroot)
1541 fullexecname = newpath(changeroot, execname);
1542 else
1543 fullexecname = execname;
1544
1545 if (stat(fullexecname, &exec_stat))
1546 fatale("unable to stat %s", fullexecname);
1547
1548 if (fullexecname != execname)
1549 free(fullexecname);
1550 }
1551
1552 if (userspec && parse_unsigned(userspec, 10, &user_id) < 0) {
1553 struct passwd *pw;
1554
1555 pw = getpwnam(userspec);
1556 if (!pw)
1557 fatale("user '%s' not found", userspec);
1558
1559 user_id = pw->pw_uid;
1560 }
1561
1562 if (changegroup && parse_unsigned(changegroup, 10, &runas_gid) < 0) {
1563 struct group *gr;
1564
1565 gr = getgrnam(changegroup);
1566 if (!gr)
1567 fatale("group '%s' not found", changegroup);
1568 changegroup = gr->gr_name;
1569 runas_gid = gr->gr_gid;
1570 }
1571 if (changeuser) {
1572 struct passwd *pw;
1573 struct stat st;
1574
1575 if (parse_unsigned(changeuser, 10, &runas_uid) == 0)
1576 pw = getpwuid(runas_uid);
1577 else
1578 pw = getpwnam(changeuser);
1579 if (!pw)
1580 fatale("user '%s' not found", changeuser);
1581 changeuser = pw->pw_name;
1582 runas_uid = pw->pw_uid;
1583 if (changegroup == NULL) {
1584 /* Pass the default group of this user. */
1585 changegroup = ""; /* Just empty. */
1586 runas_gid = pw->pw_gid;
1587 }
1588 if (stat(pw->pw_dir, &st) == 0)
1589 setenv("HOME", pw->pw_dir, 1);
1590 }
1591 }
1592
1593 #if defined(OS_Linux)
1594 static const char *
1595 proc_status_field(pid_t pid, const char *field)
1596 {
1597 static char *line = NULL;
1598 static size_t line_size = 0;
1599
1600 FILE *fp;
1601 char filename[32];
1602 char *value = NULL;
1603 ssize_t line_len;
1604 size_t field_len = strlen(field);
1605
1606 sprintf(filename, "/proc/%d/status", pid);
1607 fp = fopen(filename, "r");
1608 if (!fp)
1609 return NULL;
1610 while ((line_len = getline(&line, &line_size, fp)) >= 0) {
1611 if (strncasecmp(line, field, field_len) == 0) {
1612 line[line_len - 1] = '\0';
1613
1614 value = line + field_len;
1615 while (isspace(*value))
1616 value++;
1617
1618 break;
1619 }
1620 }
1621 fclose(fp);
1622
1623 return value;
1624 }
1625 #elif (defined(OS_Solaris) || defined(OS_AIX)) && defined(HAVE_STRUCT_PSINFO)
1626 static bool
1627 proc_get_psinfo(pid_t pid, struct psinfo *psinfo)
1628 {
1629 char filename[64];
1630 FILE *fp;
1631
1632 sprintf(filename, "/proc/%d/psinfo", pid);
1633 fp = fopen(filename, "r");
1634 if (!fp)
1635 return false;
1636 if (fread(psinfo, sizeof(*psinfo), 1, fp) == 0) {
1637 fclose(fp);
1638 return false;
1639 }
1640 if (ferror(fp)) {
1641 fclose(fp);
1642 return false;
1643 }
1644
1645 fclose(fp);
1646
1647 return true;
1648 }
1649 #elif defined(OS_Hurd)
1650 static void
1651 init_procset(void)
1652 {
1653 struct ps_context *context;
1654 error_t err;
1655
1656 err = ps_context_create(getproc(), &context);
1657 if (err)
1658 error(1, err, "ps_context_create");
1659
1660 err = proc_stat_list_create(context, &procset);
1661 if (err)
1662 error(1, err, "proc_stat_list_create");
1663
1664 err = proc_stat_list_add_all(procset, 0, 0);
1665 if (err)
1666 error(1, err, "proc_stat_list_add_all");
1667 }
1668
1669 static struct proc_stat *
1670 get_proc_stat(pid_t pid, ps_flags_t flags)
1671 {
1672 struct proc_stat *ps;
1673 ps_flags_t wanted_flags = PSTAT_PID | flags;
1674
1675 if (!procset)
1676 init_procset();
1677
1678 ps = proc_stat_list_pid_proc_stat(procset, pid);
1679 if (!ps)
1680 return NULL;
1681 if (proc_stat_set_flags(ps, wanted_flags))
1682 return NULL;
1683 if ((proc_stat_flags(ps) & wanted_flags) != wanted_flags)
1684 return NULL;
1685
1686 return ps;
1687 }
1688 #elif defined(HAVE_KVM_H)
1689 static kvm_t *
1690 ssd_kvm_open(void)
1691 {
1692 kvm_t *kd;
1693 char errbuf[_POSIX2_LINE_MAX];
1694
1695 kd = kvm_openfiles(NULL, KVM_MEMFILE, NULL, O_RDONLY, errbuf);
1696 if (kd == NULL)
1697 errx(1, "%s", errbuf);
1698
1699 return kd;
1700 }
1701
1702 static struct kinfo_proc *
1703 ssd_kvm_get_procs(kvm_t *kd, int op, int arg, int *count)
1704 {
1705 struct kinfo_proc *kp;
1706 int lcount;
1707
1708 if (count == NULL)
1709 count = &lcount;
1710 *count = 0;
1711
1712 #if defined(OS_OpenBSD)
1713 kp = kvm_getprocs(kd, op, arg, sizeof(*kp), count);
1714 #else
1715 kp = kvm_getprocs(kd, op, arg, count);
1716 #endif
1717 if (kp == NULL && errno != ESRCH)
1718 errx(1, "%s", kvm_geterr(kd));
1719
1720 return kp;
1721 }
1722 #endif
1723
1724 #if defined(OS_Linux)
1725 static bool
1726 pid_is_exec(pid_t pid, const struct stat *esb)
1727 {
1728 char lname[32];
1729 char lcontents[_POSIX_PATH_MAX + 1];
1730 char *filename;
1731 const char deleted[] = " (deleted)";
1732 int nread;
1733 struct stat sb;
1734
1735 sprintf(lname, "/proc/%d/exe", pid);
1736 nread = readlink(lname, lcontents, sizeof(lcontents) - 1);
1737 if (nread < 0)
1738 return false;
1739
1740 filename = lcontents;
1741 filename[nread] = '\0';
1742
1743 /* OpenVZ kernels contain a bogus patch that instead of appending,
1744 * prepends the deleted marker. Workaround those. Otherwise handle
1745 * the normal appended marker. */
1746 if (strncmp(filename, deleted, strlen(deleted)) == 0)
1747 filename += strlen(deleted);
1748 else if (strcmp(filename + nread - strlen(deleted), deleted) == 0)
1749 filename[nread - strlen(deleted)] = '\0';
1750
1751 if (stat(filename, &sb) != 0)
1752 return false;
1753
1754 return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
1755 }
1756 #elif (defined(OS_Solaris) || defined(OS_AIX)) && defined(HAVE_STRUCT_PSINFO)
1757 static bool
1758 pid_is_exec(pid_t pid, const struct stat *esb)
1759 {
1760 struct stat sb;
1761 char filename[64];
1762
1763 sprintf(filename, "/proc/%d/object/a.out", pid);
1764
1765 if (stat(filename, &sb) != 0)
1766 return false;
1767
1768 return sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino;
1769 }
1770 #elif defined(OS_Hurd)
1771 static bool
1772 pid_is_exec(pid_t pid, const struct stat *esb)
1773 {
1774 struct proc_stat *ps;
1775 struct stat sb;
1776 const char *filename;
1777
1778 ps = get_proc_stat(pid, PSTAT_ARGS);
1779 if (ps == NULL)
1780 return false;
1781
1782 /* On old Hurd systems we have to use the argv[0] value, because
1783 * there is nothing better. */
1784 filename = proc_stat_args(ps);
1785 #ifdef PSTAT_EXE
1786 /* On new Hurd systems we can use the correct value, as long
1787 * as it's not NULL nor empty, as it was the case on the first
1788 * implementation. */
1789 if (proc_stat_set_flags(ps, PSTAT_EXE) == 0 &&
1790 proc_stat_flags(ps) & PSTAT_EXE &&
1791 proc_stat_exe(ps) != NULL &&
1792 proc_stat_exe(ps)[0] != '\0')
1793 filename = proc_stat_exe(ps);
1794 #endif
1795
1796 if (stat(filename, &sb) != 0)
1797 return false;
1798
1799 return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
1800 }
1801 #elif defined(OS_Darwin)
1802 static bool
1803 pid_is_exec(pid_t pid, const struct stat *esb)
1804 {
1805 struct stat sb;
1806 char pathname[_POSIX_PATH_MAX];
1807
1808 if (proc_pidpath(pid, pathname, sizeof(pathname)) < 0)
1809 return false;
1810
1811 if (stat(pathname, &sb) != 0)
1812 return false;
1813
1814 return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
1815 }
1816 #elif defined(OS_HPUX)
1817 static bool
1818 pid_is_exec(pid_t pid, const struct stat *esb)
1819 {
1820 struct pst_status pst;
1821
1822 if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0)
1823 return false;
1824 return ((dev_t)pst.pst_text.psf_fsid.psfs_id == esb->st_dev &&
1825 (ino_t)pst.pst_text.psf_fileid == esb->st_ino);
1826 }
1827 #elif defined(OS_FreeBSD)
1828 static bool
1829 pid_is_exec(pid_t pid, const struct stat *esb)
1830 {
1831 struct stat sb;
1832 int error, mib[4];
1833 size_t len;
1834 char pathname[PATH_MAX];
1835
1836 mib[0] = CTL_KERN;
1837 mib[1] = KERN_PROC;
1838 mib[2] = KERN_PROC_PATHNAME;
1839 mib[3] = pid;
1840 len = sizeof(pathname);
1841
1842 error = sysctl(mib, 4, pathname, &len, NULL, 0);
1843 if (error != 0 && errno != ESRCH)
1844 return false;
1845 if (len == 0)
1846 pathname[0] = '\0';
1847
1848 if (stat(pathname, &sb) != 0)
1849 return false;
1850
1851 return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
1852 }
1853 #elif defined(HAVE_KVM_H)
1854 static bool
1855 pid_is_exec(pid_t pid, const struct stat *esb)
1856 {
1857 kvm_t *kd;
1858 int argv_len = 0;
1859 struct kinfo_proc *kp;
1860 struct stat sb;
1861 char buf[_POSIX2_LINE_MAX];
1862 char **pid_argv_p;
1863 char *start_argv_0_p, *end_argv_0_p;
1864 bool res = false;
1865
1866 kd = ssd_kvm_open();
1867 kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL);
1868 if (kp == NULL)
1869 goto cleanup;
1870
1871 pid_argv_p = kvm_getargv(kd, kp, argv_len);
1872 if (pid_argv_p == NULL)
1873 errx(1, "%s", kvm_geterr(kd));
1874
1875 /* Find and compare string. */
1876 start_argv_0_p = *pid_argv_p;
1877
1878 /* Find end of argv[0] then copy and cut off str there. */
1879 end_argv_0_p = strchr(*pid_argv_p, ' ');
1880 if (end_argv_0_p == NULL)
1881 /* There seems to be no space, so we have the command
1882 * already in its desired form. */
1883 start_argv_0_p = *pid_argv_p;
1884 else {
1885 /* Tests indicate that this never happens, since
1886 * kvm_getargv itself cuts off tailing stuff. This is
1887 * not what the manual page says, however. */
1888 strncpy(buf, *pid_argv_p, (end_argv_0_p - start_argv_0_p));
1889 buf[(end_argv_0_p - start_argv_0_p) + 1] = '\0';
1890 start_argv_0_p = buf;
1891 }
1892
1893 if (stat(start_argv_0_p, &sb) != 0)
1894 goto cleanup;
1895
1896 res = (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
1897
1898 cleanup:
1899 kvm_close(kd);
1900
1901 return res;
1902 }
1903 #endif
1904
1905 #if defined(OS_Linux)
1906 static bool
1907 pid_is_child(pid_t pid, pid_t ppid)
1908 {
1909 const char *ppid_str;
1910 pid_t proc_ppid;
1911 int rc;
1912
1913 ppid_str = proc_status_field(pid, "PPid:");
1914 if (ppid_str == NULL)
1915 return false;
1916
1917 rc = parse_pid(ppid_str, &proc_ppid);
1918 if (rc < 0)
1919 return false;
1920
1921 return proc_ppid == ppid;
1922 }
1923 #elif defined(OS_Hurd)
1924 static bool
1925 pid_is_child(pid_t pid, pid_t ppid)
1926 {
1927 struct proc_stat *ps;
1928 struct procinfo *pi;
1929
1930 ps = get_proc_stat(pid, PSTAT_PROC_INFO);
1931 if (ps == NULL)
1932 return false;
1933
1934 pi = proc_stat_proc_info(ps);
1935
1936 return pi->ppid == ppid;
1937 }
1938 #elif defined(OS_Darwin)
1939 static bool
1940 pid_is_child(pid_t pid, pid_t ppid)
1941 {
1942 struct proc_bsdinfo pbi;
1943
1944 if (proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &pbi, sizeof(pbi)) < 0)
1945 return false;
1946
1947 return (pid_t)pbi.pbi_ppid == ppid;
1948 }
1949 #elif (defined(OS_Solaris) || defined(OS_AIX)) && defined(HAVE_STRUCT_PSINFO)
1950 static bool
1951 pid_is_child(pid_t pid, pid_t ppid)
1952 {
1953 struct psinfo psi;
1954
1955 if (!proc_get_psinfo(pid, &psi))
1956 return false;
1957
1958 return (pid_t)psi.pr_ppid == ppid;
1959 }
1960 #elif defined(OS_HPUX)
1961 static bool
1962 pid_is_child(pid_t pid, pid_t ppid)
1963 {
1964 struct pst_status pst;
1965
1966 if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0)
1967 return false;
1968
1969 return pst.pst_ppid == ppid;
1970 }
1971 #elif defined(OS_FreeBSD)
1972 static bool
1973 pid_is_child(pid_t pid, pid_t ppid)
1974 {
1975 struct kinfo_proc kp;
1976 int rc, mib[4];
1977 size_t len;
1978
1979 mib[0] = CTL_KERN;
1980 mib[1] = KERN_PROC;
1981 mib[2] = KERN_PROC_PID;
1982 mib[3] = pid;
1983 len = sizeof(kp);
1984
1985 rc = sysctl(mib, 4, &kp, &len, NULL, 0);
1986 if (rc != 0 && errno != ESRCH)
1987 return false;
1988 if (len == 0 || len != sizeof(kp))
1989 return false;
1990
1991 return kp.ki_ppid == ppid;
1992 }
1993 #elif defined(HAVE_KVM_H)
1994 static bool
1995 pid_is_child(pid_t pid, pid_t ppid)
1996 {
1997 kvm_t *kd;
1998 struct kinfo_proc *kp;
1999 pid_t proc_ppid;
2000 bool res = false;
2001
2002 kd = ssd_kvm_open();
2003 kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL);
2004 if (kp == NULL)
2005 goto cleanup;
2006
2007 #if defined(OS_FreeBSD)
2008 proc_ppid = kp->ki_ppid;
2009 #elif defined(OS_OpenBSD)
2010 proc_ppid = kp->p_ppid;
2011 #elif defined(OS_DragonFlyBSD)
2012 proc_ppid = kp->kp_ppid;
2013 #else
2014 proc_ppid = kp->kp_proc.p_ppid;
2015 #endif
2016
2017 res = (proc_ppid == ppid);
2018
2019 cleanup:
2020 kvm_close(kd);
2021
2022 return res;
2023 }
2024 #endif
2025
2026 #if defined(OS_Linux)
2027 static bool
2028 pid_is_user(pid_t pid, uid_t uid)
2029 {
2030 struct stat sb;
2031 char buf[32];
2032
2033 sprintf(buf, "/proc/%d", pid);
2034 if (stat(buf, &sb) != 0)
2035 return false;
2036 return (sb.st_uid == uid);
2037 }
2038 #elif defined(OS_Hurd)
2039 static bool
2040 pid_is_user(pid_t pid, uid_t uid)
2041 {
2042 struct proc_stat *ps;
2043
2044 ps = get_proc_stat(pid, PSTAT_OWNER_UID);
2045 return ps && (uid_t)proc_stat_owner_uid(ps) == uid;
2046 }
2047 #elif defined(OS_Darwin)
2048 static bool
2049 pid_is_user(pid_t pid, uid_t uid)
2050 {
2051 struct proc_bsdinfo pbi;
2052
2053 if (proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &pbi, sizeof(pbi)) < 0)
2054 return false;
2055
2056 return pbi.pbi_ruid == uid;
2057 }
2058 #elif (defined(OS_Solaris) || defined(OS_AIX)) && defined(HAVE_STRUCT_PSINFO)
2059 static bool
2060 pid_is_user(pid_t pid, uid_t uid)
2061 {
2062 struct psinfo psi;
2063
2064 if (!proc_get_psinfo(pid, &psi))
2065 return false;
2066
2067 return psi.pr_uid == uid;
2068 }
2069 #elif defined(OS_HPUX)
2070 static bool
2071 pid_is_user(pid_t pid, uid_t uid)
2072 {
2073 struct pst_status pst;
2074
2075 if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0)
2076 return false;
2077 return ((uid_t)pst.pst_uid == uid);
2078 }
2079 #elif defined(OS_FreeBSD)
2080 static bool
2081 pid_is_user(pid_t pid, uid_t uid)
2082 {
2083 struct kinfo_proc kp;
2084 int rc, mib[4];
2085 size_t len;
2086
2087 mib[0] = CTL_KERN;
2088 mib[1] = KERN_PROC;
2089 mib[2] = KERN_PROC_PID;
2090 mib[3] = pid;
2091 len = sizeof(kp);
2092
2093 rc = sysctl(mib, 4, &kp, &len, NULL, 0);
2094 if (rc != 0 && errno != ESRCH)
2095 return false;
2096 if (len == 0 || len != sizeof(kp))
2097 return false;
2098
2099 return kp.ki_ruid == uid;
2100 }
2101 #elif defined(HAVE_KVM_H)
2102 static bool
2103 pid_is_user(pid_t pid, uid_t uid)
2104 {
2105 kvm_t *kd;
2106 uid_t proc_uid;
2107 struct kinfo_proc *kp;
2108 bool res = false;
2109
2110 kd = ssd_kvm_open();
2111 kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL);
2112 if (kp == NULL)
2113 goto cleanup;
2114
2115 #if defined(OS_FreeBSD)
2116 proc_uid = kp->ki_ruid;
2117 #elif defined(OS_OpenBSD)
2118 proc_uid = kp->p_ruid;
2119 #elif defined(OS_DragonFlyBSD)
2120 proc_uid = kp->kp_ruid;
2121 #elif defined(OS_NetBSD)
2122 proc_uid = kp->kp_eproc.e_pcred.p_ruid;
2123 #else
2124 if (kp->kp_proc.p_cred)
2125 kvm_read(kd, (u_long)&(kp->kp_proc.p_cred->p_ruid),
2126 &proc_uid, sizeof(uid_t));
2127 else
2128 goto cleanup;
2129 #endif
2130
2131 res = (proc_uid == (uid_t)uid);
2132
2133 cleanup:
2134 kvm_close(kd);
2135
2136 return res;
2137 }
2138 #endif
2139
2140 #if defined(OS_Linux)
2141 static bool
2142 pid_is_cmd(pid_t pid, const char *name)
2143 {
2144 const char *comm;
2145
2146 comm = proc_status_field(pid, "Name:");
2147 if (comm == NULL)
2148 return false;
2149
2150 return strcmp(comm, name) == 0;
2151 }
2152 #elif defined(OS_Hurd)
2153 static bool
2154 pid_is_cmd(pid_t pid, const char *name)
2155 {
2156 struct proc_stat *ps;
2157 size_t argv0_len;
2158 const char *argv0;
2159 const char *binary_name;
2160
2161 ps = get_proc_stat(pid, PSTAT_ARGS);
2162 if (ps == NULL)
2163 return false;
2164
2165 argv0 = proc_stat_args(ps);
2166 argv0_len = strlen(argv0) + 1;
2167
2168 binary_name = basename(argv0);
2169 if (strcmp(binary_name, name) == 0)
2170 return true;
2171
2172 /* XXX: This is all kinds of ugly, but on the Hurd there's no way to
2173 * know the command name of a process, so we have to try to match
2174 * also on argv[1] for the case of an interpreted script. */
2175 if (proc_stat_args_len(ps) > argv0_len) {
2176 const char *script_name = basename(argv0 + argv0_len);
2177
2178 return strcmp(script_name, name) == 0;
2179 }
2180
2181 return false;
2182 }
2183 #elif (defined(OS_Solaris) || defined(OS_AIX)) && defined(HAVE_STRUCT_PSINFO)
2184 static bool
2185 pid_is_cmd(pid_t pid, const char *name)
2186 {
2187 struct psinfo psi;
2188
2189 if (!proc_get_psinfo(pid, &psi))
2190 return false;
2191
2192 return strcmp(psi.pr_fname, name) == 0;
2193 }
2194 #elif defined(OS_HPUX)
2195 static bool
2196 pid_is_cmd(pid_t pid, const char *name)
2197 {
2198 struct pst_status pst;
2199
2200 if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0)
2201 return false;
2202 return (strcmp(pst.pst_ucomm, name) == 0);
2203 }
2204 #elif defined(OS_Darwin)
2205 static bool
2206 pid_is_cmd(pid_t pid, const char *name)
2207 {
2208 char pathname[_POSIX_PATH_MAX];
2209
2210 if (proc_pidpath(pid, pathname, sizeof(pathname)) < 0)
2211 return false;
2212
2213 return strcmp(pathname, name) == 0;
2214 }
2215 #elif defined(OS_FreeBSD)
2216 static bool
2217 pid_is_cmd(pid_t pid, const char *name)
2218 {
2219 struct kinfo_proc kp;
2220 int rc, mib[4];
2221 size_t len;
2222
2223 mib[0] = CTL_KERN;
2224 mib[1] = KERN_PROC;
2225 mib[2] = KERN_PROC_PID;
2226 mib[3] = pid;
2227 len = sizeof(kp);
2228
2229 rc = sysctl(mib, 4, &kp, &len, NULL, 0);
2230 if (rc != 0 && errno != ESRCH)
2231 return false;
2232 if (len == 0 || len != sizeof(kp))
2233 return false;
2234
2235 return strcmp(kp.ki_comm, name) == 0;
2236 }
2237 #elif defined(HAVE_KVM_H)
2238 static bool
2239 pid_is_cmd(pid_t pid, const char *name)
2240 {
2241 kvm_t *kd;
2242 struct kinfo_proc *kp;
2243 char *process_name;
2244 bool res = false;
2245
2246 kd = ssd_kvm_open();
2247 kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL);
2248 if (kp == NULL)
2249 goto cleanup;
2250
2251 #if defined(OS_FreeBSD)
2252 process_name = kp->ki_comm;
2253 #elif defined(OS_OpenBSD)
2254 process_name = kp->p_comm;
2255 #elif defined(OS_DragonFlyBSD)
2256 process_name = kp->kp_comm;
2257 #else
2258 process_name = kp->kp_proc.p_comm;
2259 #endif
2260
2261 res = (strcmp(name, process_name) == 0);
2262
2263 cleanup:
2264 kvm_close(kd);
2265
2266 return res;
2267 }
2268 #endif
2269
2270 #if defined(OS_Hurd)
2271 static bool
2272 pid_is_running(pid_t pid)
2273 {
2274 return get_proc_stat(pid, 0) != NULL;
2275 }
2276 #else /* !OS_Hurd */
2277 static bool
2278 pid_is_running(pid_t pid)
2279 {
2280 if (kill(pid, 0) == 0 || errno == EPERM)
2281 return true;
2282 else if (errno == ESRCH)
2283 return false;
2284 else
2285 fatale("error checking pid %u status", pid);
2286 }
2287 #endif
2288
2289 static enum status_code
2290 pid_check(pid_t pid)
2291 {
2292 if (execname && !pid_is_exec(pid, &exec_stat))
2293 return STATUS_DEAD;
2294 if (match_ppid > 0 && !pid_is_child(pid, match_ppid))
2295 return STATUS_DEAD;
2296 if (userspec && !pid_is_user(pid, user_id))
2297 return STATUS_DEAD;
2298 if (cmdname && !pid_is_cmd(pid, cmdname))
2299 return STATUS_DEAD;
2300 if (action != ACTION_STOP && !pid_is_running(pid))
2301 return STATUS_DEAD;
2302
2303 pid_list_push(&found, pid);
2304
2305 return STATUS_OK;
2306 }
2307
2308 static enum status_code
2309 do_pidfile(const char *name)
2310 {
2311 FILE *f;
2312 static pid_t pid = 0;
2313
2314 if (pid)
2315 return pid_check(pid);
2316
2317 f = fopen(name, "r");
2318 if (f) {
2319 enum status_code pid_status;
2320
2321 /* If we are only matching on the pidfile, and it is owned by
2322 * a non-root user, then this is a security risk, and the
2323 * contents cannot be trusted, because the daemon might have
2324 * been compromised.
2325 *
2326 * If the pidfile is world-writable we refuse to parse it.
2327 *
2328 * If we got /dev/null specified as the pidfile, we ignore the
2329 * checks, as this is being used to run processes no matter
2330 * what. */
2331 if (strcmp(name, "/dev/null") != 0) {
2332 struct stat st;
2333 int fd = fileno(f);
2334
2335 if (fstat(fd, &st) < 0)
2336 fatale("cannot stat pidfile %s", name);
2337
2338 if (match_mode == MATCH_PIDFILE &&
2339 ((st.st_uid != getuid() && st.st_uid != 0) ||
2340 (st.st_gid != getgid() && st.st_gid != 0)))
2341 fatal("matching only on non-root pidfile %s is insecure", name);
2342 if (st.st_mode & 0002)
2343 fatal("matching on world-writable pidfile %s is insecure", name);
2344 }
2345
2346 if (fscanf(f, "%d", &pid) == 1)
2347 pid_status = pid_check(pid);
2348 else
2349 pid_status = STATUS_UNKNOWN;
2350 fclose(f);
2351
2352 if (pid_status == STATUS_DEAD)
2353 return STATUS_DEAD_PIDFILE;
2354 else
2355 return pid_status;
2356 } else if (errno == ENOENT)
2357 return STATUS_DEAD;
2358 else
2359 fatale("unable to open pidfile %s", name);
2360 }
2361
2362 #if defined(OS_Linux) || defined(OS_Solaris) || defined(OS_AIX)
2363 static enum status_code
2364 do_procinit(void)
2365 {
2366 DIR *procdir;
2367 struct dirent *entry;
2368 int foundany;
2369 pid_t pid;
2370 enum status_code prog_status = STATUS_DEAD;
2371
2372 procdir = opendir("/proc");
2373 if (!procdir)
2374 fatale("unable to opendir /proc");
2375
2376 foundany = 0;
2377 while ((entry = readdir(procdir)) != NULL) {
2378 enum status_code pid_status;
2379
2380 if (sscanf(entry->d_name, "%d", &pid) != 1)
2381 continue;
2382 foundany++;
2383
2384 pid_status = pid_check(pid);
2385 if (pid_status < prog_status)
2386 prog_status = pid_status;
2387 }
2388 closedir(procdir);
2389 if (foundany == 0)
2390 fatal("nothing in /proc - not mounted?");
2391
2392 return prog_status;
2393 }
2394 #elif defined(OS_Hurd)
2395 static int
2396 check_proc_stat(struct proc_stat *ps)
2397 {
2398 pid_check(proc_stat_pid(ps));
2399 return 0;
2400 }
2401
2402 static enum status_code
2403 do_procinit(void)
2404 {
2405 if (!procset)
2406 init_procset();
2407
2408 proc_stat_list_for_each(procset, check_proc_stat);
2409
2410 if (found)
2411 return STATUS_OK;
2412 else
2413 return STATUS_DEAD;
2414 }
2415 #elif defined(OS_Darwin)
2416 static enum status_code
2417 do_procinit(void)
2418 {
2419 pid_t *pid_buf;
2420 int i, npids, pid_bufsize;
2421 enum status_code prog_status = STATUS_DEAD;
2422
2423 npids = proc_listallpids(NULL, 0);
2424 if (npids == 0)
2425 return STATUS_UNKNOWN;
2426
2427 /* Try to avoid sudden changes in number of PIDs. */
2428 npids += 4096;
2429 pid_bufsize = sizeof(pid_t) * npids;
2430 pid_buf = xmalloc(pid_bufsize);
2431
2432 npids = proc_listallpids(pid_buf, pid_bufsize);
2433 if (npids == 0)
2434 return STATUS_UNKNOWN;
2435
2436 for (i = 0; i < npids; i++) {
2437 enum status_code pid_status;
2438
2439 pid_status = pid_check(pid_buf[i]);
2440 if (pid_status < prog_status)
2441 prog_status = pid_status;
2442 }
2443
2444 free(pid_buf);
2445
2446 return prog_status;
2447 }
2448 #elif defined(OS_HPUX)
2449 static enum status_code
2450 do_procinit(void)
2451 {
2452 struct pst_status pst[10];
2453 int i, count;
2454 int idx = 0;
2455 enum status_code prog_status = STATUS_DEAD;
2456
2457 while ((count = pstat_getproc(pst, sizeof(pst[0]), 10, idx)) > 0) {
2458 for (i = 0; i < count; i++) {
2459 enum status_code pid_status;
2460
2461 pid_status = pid_check(pst[i].pst_pid);
2462 if (pid_status < prog_status)
2463 prog_status = pid_status;
2464 }
2465 idx = pst[count - 1].pst_idx + 1;
2466 }
2467
2468 return prog_status;
2469 }
2470 #elif defined(OS_FreeBSD)
2471 static enum status_code
2472 do_procinit(void)
2473 {
2474 struct kinfo_proc *kp;
2475 int rc, mib[3];
2476 size_t len = 0;
2477 int nentries, i;
2478 enum status_code prog_status = STATUS_DEAD;
2479
2480 mib[0] = CTL_KERN;
2481 mib[1] = KERN_PROC;
2482 mib[2] = KERN_PROC_PROC;
2483
2484 rc = sysctl(mib, 3, NULL, &len, NULL, 0);
2485 if (rc != 0 && errno != ESRCH)
2486 return STATUS_UNKNOWN;
2487 if (len == 0)
2488 return STATUS_UNKNOWN;
2489
2490 kp = xmalloc(len);
2491 rc = sysctl(mib, 3, kp, &len, NULL, 0);
2492 if (rc != 0 && errno != ESRCH)
2493 return STATUS_UNKNOWN;
2494 if (len == 0)
2495 return STATUS_UNKNOWN;
2496 nentries = len / sizeof(*kp);
2497
2498 for (i = 0; i < nentries; i++) {
2499 enum status_code pid_status;
2500
2501 pid_status = pid_check(kp[i].ki_pid);
2502 if (pid_status < prog_status)
2503 prog_status = pid_status;
2504 }
2505
2506 free(kp);
2507
2508 return prog_status;
2509 }
2510 #elif defined(HAVE_KVM_H)
2511 static enum status_code
2512 do_procinit(void)
2513 {
2514 kvm_t *kd;
2515 int nentries, i;
2516 struct kinfo_proc *kp;
2517 enum status_code prog_status = STATUS_DEAD;
2518
2519 kd = ssd_kvm_open();
2520 kp = ssd_kvm_get_procs(kd, KERN_PROC_ALL, 0, &nentries);
2521
2522 for (i = 0; i < nentries; i++) {
2523 enum status_code pid_status;
2524 pid_t pid;
2525
2526 #if defined(OS_FreeBSD)
2527 pid = kp[i].ki_pid;
2528 #elif defined(OS_OpenBSD)
2529 pid = kp[i].p_pid;
2530 #elif defined(OS_DragonFlyBSD)
2531 pid = kp[i].kp_pid;
2532 #else
2533 pid = kp[i].kp_proc.p_pid;
2534 #endif
2535
2536 pid_status = pid_check(pid);
2537 if (pid_status < prog_status)
2538 prog_status = pid_status;
2539 }
2540
2541 kvm_close(kd);
2542
2543 return prog_status;
2544 }
2545 #endif
2546
2547 static enum status_code
2548 do_findprocs(void)
2549 {
2550 pid_list_free(&found);
2551
2552 if (match_pid > 0)
2553 return pid_check(match_pid);
2554 else if (pidfile)
2555 return do_pidfile(pidfile);
2556 else
2557 return do_procinit();
2558 }
2559
2560 static int
2561 do_start(int argc, char **argv)
2562 {
2563 int devnull_fd = -1;
2564 int output_fd = -1;
2565 gid_t rgid;
2566 uid_t ruid;
2567
2568 do_findprocs();
2569
2570 if (found) {
2571 info("%s already running.\n", execname ? execname : "process");
2572 return exitnodo;
2573 }
2574 if (testmode && quietmode <= 0) {
2575 printf("Would start %s ", startas);
2576 while (argc-- > 0)
2577 printf("%s ", *argv++);
2578 if (changeuser != NULL) {
2579 printf(" (as user %s[%d]", changeuser, runas_uid);
2580 if (changegroup != NULL)
2581 printf(", and group %s[%d])", changegroup, runas_gid);
2582 else
2583 printf(")");
2584 }
2585 if (changeroot != NULL)
2586 printf(" in directory %s", changeroot);
2587 if (nicelevel)
2588 printf(", and add %i to the priority", nicelevel);
2589 if (proc_sched)
2590 printf(", with scheduling policy %s with priority %i",
2591 proc_sched->policy_name, proc_sched->priority);
2592 if (io_sched)
2593 printf(", with IO scheduling class %s with priority %i",
2594 io_sched->policy_name, io_sched->priority);
2595 printf(".\n");
2596 }
2597 if (testmode)
2598 return 0;
2599 debug("Starting %s...\n", startas);
2600 *--argv = startas;
2601 if (umask_value >= 0)
2602 umask(umask_value);
2603 if (background)
2604 /* Ok, we need to detach this process. */
2605 daemonize();
2606 else if (mpidfile && pidfile != NULL)
2607 /* User wants _us_ to make the pidfile, but detach themself! */
2608 write_pidfile(pidfile, getpid());
2609 if (background && close_io) {
2610 devnull_fd = open("/dev/null", O_RDONLY);
2611 if (devnull_fd < 0)
2612 fatale("unable to open '%s'", "/dev/null");
2613 }
2614 if (background && output_io) {
2615 output_fd = open(output_io, O_CREAT | O_WRONLY | O_APPEND, 0664);
2616 if (output_fd < 0)
2617 fatale("unable to open '%s'", output_io);
2618 }
2619 if (nicelevel) {
2620 errno = 0;
2621 if ((nice(nicelevel) == -1) && (errno != 0))
2622 fatale("unable to alter nice level by %i", nicelevel);
2623 }
2624 if (proc_sched)
2625 set_proc_schedule(proc_sched);
2626 if (io_sched)
2627 set_io_schedule(io_sched);
2628 if (changeroot != NULL) {
2629 if (chdir(changeroot) < 0)
2630 fatale("unable to chdir() to %s", changeroot);
2631 if (chroot(changeroot) < 0)
2632 fatale("unable to chroot() to %s", changeroot);
2633 }
2634 if (chdir(changedir) < 0)
2635 fatale("unable to chdir() to %s", changedir);
2636
2637 rgid = getgid();
2638 ruid = getuid();
2639 if (changegroup != NULL) {
2640 if (rgid != (gid_t)runas_gid)
2641 if (setgid(runas_gid))
2642 fatale("unable to set gid to %d", runas_gid);
2643 }
2644 if (changeuser != NULL) {
2645 /* We assume that if our real user and group are the same as
2646 * the ones we should switch to, the supplementary groups
2647 * will be already in place. */
2648 if (rgid != (gid_t)runas_gid || ruid != (uid_t)runas_uid)
2649 if (initgroups(changeuser, runas_gid))
2650 fatale("unable to set initgroups() with gid %d",
2651 runas_gid);
2652
2653 if (ruid != (uid_t)runas_uid)
2654 if (setuid(runas_uid))
2655 fatale("unable to set uid to %s", changeuser);
2656 }
2657
2658 if (background && output_fd >= 0) {
2659 dup2(output_fd, 1); /* stdout */
2660 dup2(output_fd, 2); /* stderr */
2661 }
2662 if (background && close_io) {
2663 int i;
2664
2665 dup2(devnull_fd, 0); /* stdin */
2666
2667 /* Now close all extra fds. */
2668 for (i = get_open_fd_max() - 1; i >= 3; --i)
2669 close(i);
2670 }
2671 execv(startas, argv);
2672 fatale("unable to start %s", startas);
2673 }
2674
2675 struct stop_context {
2676 int retry_nr;
2677 int n_killed;
2678 int n_notkilled;
2679 bool anykilled;
2680 };
2681
2682 static void
2683 do_stop(struct stop_context *ctx, int sig_num)
2684 {
2685 struct pid_list *p;
2686
2687 do_findprocs();
2688
2689 ctx->n_killed = 0;
2690 ctx->n_notkilled = 0;
2691
2692 if (!found)
2693 return;
2694
2695 pid_list_free(&killed);
2696
2697 for (p = found; p; p = p->next) {
2698 if (testmode) {
2699 info("Would send signal %d to %d.\n", sig_num, p->pid);
2700 ctx->n_killed++;
2701 } else if (kill(p->pid, sig_num) == 0) {
2702 pid_list_push(&killed, p->pid);
2703 ctx->n_killed++;
2704 } else {
2705 if (sig_num)
2706 warning("failed to kill %d: %s\n",
2707 p->pid, strerror(errno));
2708 ctx->n_notkilled++;
2709 }
2710 }
2711 }
2712
2713 static void
2714 do_stop_summary(struct stop_context *ctx)
2715 {
2716 struct pid_list *p;
2717
2718 if (quietmode >= 0 || !killed)
2719 return;
2720
2721 printf("Stopped %s (pid", what_stop);
2722 for (p = killed; p; p = p->next)
2723 printf(" %d", p->pid);
2724 putchar(')');
2725 if (ctx->retry_nr > 0)
2726 printf(", retry #%d", ctx->retry_nr);
2727 printf(".\n");
2728 }
2729
2730 static void LIBCOMPAT_ATTR_PRINTF(1)
2731 set_what_stop(const char *format, ...)
2732 {
2733 va_list arglist;
2734 int rc;
2735
2736 va_start(arglist, format);
2737 rc = vasprintf(&what_stop, format, arglist);
2738 va_end(arglist);
2739
2740 if (rc < 0)
2741 fatale("cannot allocate formatted string");
2742 }
2743
2744 /*
2745 * We want to keep polling for the processes, to see if they've exited, or
2746 * until the timeout expires.
2747 *
2748 * This is a somewhat complicated algorithm to try to ensure that we notice
2749 * reasonably quickly when all the processes have exited, but don't spend
2750 * too much CPU time polling. In particular, on a fast machine with
2751 * quick-exiting daemons we don't want to delay system shutdown too much,
2752 * whereas on a slow one, or where processes are taking some time to exit,
2753 * we want to increase the polling interval.
2754 *
2755 * The algorithm is as follows: we measure the elapsed time it takes to do
2756 * one poll(), and wait a multiple of this time for the next poll. However,
2757 * if that would put us past the end of the timeout period we wait only as
2758 * long as the timeout period, but in any case we always wait at least
2759 * MIN_POLL_INTERVAL (20ms). The multiple (‘ratio’) starts out as 2, and
2760 * increases by 1 for each poll to a maximum of 10; so we use up to between
2761 * 30% and 10% of the machine's resources (assuming a few reasonable things
2762 * about system performance).
2763 */
2764 static bool
2765 do_stop_timeout(struct stop_context *ctx, int timeout)
2766 {
2767 struct timespec stopat, before, after, interval, maxinterval;
2768 int ratio;
2769
2770 timespec_gettime(&stopat);
2771 stopat.tv_sec += timeout;
2772 ratio = 1;
2773 for (;;) {
2774 int rc;
2775
2776 timespec_gettime(&before);
2777 if (timespec_cmp(&before, &stopat, >))
2778 return false;
2779
2780 do_stop(ctx, 0);
2781 if (ctx->n_killed == 0)
2782 return true;
2783
2784 timespec_gettime(&after);
2785
2786 if (!timespec_cmp(&after, &stopat, <))
2787 return false;
2788
2789 if (ratio < 10)
2790 ratio++;
2791
2792 timespec_sub(&stopat, &after, &maxinterval);
2793 timespec_sub(&after, &before, &interval);
2794 timespec_mul(&interval, ratio);
2795
2796 if (interval.tv_sec < 0 || interval.tv_nsec < 0)
2797 interval.tv_sec = interval.tv_nsec = 0;
2798
2799 if (timespec_cmp(&interval, &maxinterval, >))
2800 interval = maxinterval;
2801
2802 if (interval.tv_sec == 0 &&
2803 interval.tv_nsec <= MIN_POLL_INTERVAL)
2804 interval.tv_nsec = MIN_POLL_INTERVAL;
2805
2806 rc = pselect(0, NULL, NULL, NULL, &interval, NULL);
2807 if (rc < 0 && errno != EINTR)
2808 fatale("select() failed for pause");
2809 }
2810 }
2811
2812 static int
2813 finish_stop_schedule(struct stop_context *ctx)
2814 {
2815 if (rpidfile && pidfile && !testmode)
2816 remove_pidfile(pidfile);
2817
2818 if (ctx->anykilled)
2819 return 0;
2820
2821 info("No %s found running; none killed.\n", what_stop);
2822
2823 return exitnodo;
2824 }
2825
2826 static int
2827 run_stop_schedule(void)
2828 {
2829 struct stop_context ctx = { 0 };
2830 int position, value;
2831
2832 if (testmode) {
2833 if (schedule != NULL) {
2834 info("Ignoring --retry in test mode\n");
2835 schedule = NULL;
2836 }
2837 }
2838
2839 if (cmdname)
2840 set_what_stop("%s", cmdname);
2841 else if (execname)
2842 set_what_stop("%s", execname);
2843 else if (pidfile)
2844 set_what_stop("process in pidfile '%s'", pidfile);
2845 else if (match_pid > 0)
2846 set_what_stop("process with pid %d", match_pid);
2847 else if (match_ppid > 0)
2848 set_what_stop("process(es) with parent pid %d", match_ppid);
2849 else if (userspec)
2850 set_what_stop("process(es) owned by '%s'", userspec);
2851 else
2852 BUG("no match option, please report");
2853
2854 if (schedule == NULL) {
2855 do_stop(&ctx, signal_nr);
2856 do_stop_summary(&ctx);
2857 if (ctx.n_notkilled > 0)
2858 info("%d pids were not killed\n", ctx.n_notkilled);
2859 if (ctx.n_killed)
2860 ctx.anykilled = true;
2861 return finish_stop_schedule(&ctx);
2862 }
2863
2864 for (position = 0; position < schedule_length; position++) {
2865 reposition:
2866 value = schedule[position].value;
2867 ctx.n_notkilled = 0;
2868
2869 switch (schedule[position].type) {
2870 case sched_goto:
2871 position = value;
2872 goto reposition;
2873 case sched_signal:
2874 do_stop(&ctx, value);
2875 do_stop_summary(&ctx);
2876 ctx.retry_nr++;
2877 if (ctx.n_killed == 0)
2878 return finish_stop_schedule(&ctx);
2879 else
2880 ctx.anykilled = true;
2881 continue;
2882 case sched_timeout:
2883 if (do_stop_timeout(&ctx, value))
2884 return finish_stop_schedule(&ctx);
2885 else
2886 continue;
2887 default:
2888 BUG("schedule[%d].type value %d is not valid",
2889 position, schedule[position].type);
2890 }
2891 }
2892
2893 info("Program %s, %d process(es), refused to die.\n",
2894 what_stop, ctx.n_killed);
2895
2896 return 2;
2897 }
2898
2899 int
2900 main(int argc, char **argv)
2901 {
2902 progname = argv[0];
2903
2904 parse_options(argc, argv);
2905 setup_options();
2906
2907 argc -= optind;
2908 argv += optind;
2909
2910 if (action == ACTION_START)
2911 return do_start(argc, argv);
2912 else if (action == ACTION_STOP)
2913 return run_stop_schedule();
2914 else if (action == ACTION_STATUS)
2915 return do_findprocs();
2916
2917 return 0;
2918 }
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