/[baselayout]/trunk/src/start-stop-daemon.c
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Contents of /trunk/src/start-stop-daemon.c

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Revision 2577 - (show annotations) (download) (as text)
Wed Apr 11 12:44:47 2007 UTC (11 years, 5 months ago) by uberlord
File MIME type: text/x-csrc
File size: 22976 byte(s)
Cuddle up to LKML C style
1 /*
2 start-stop-daemon
3 Starts, stops, tests and signals daemons
4 Copyright 2007 Gentoo Foundation
5 Released under the GPLv2
6
7 This is essentially a ground up re-write of Debians
8 start-stop-daemon for cleaner code and to integrate into our RC
9 system so we can monitor daemons a little.
10 */
11
12 #define POLL_INTERVAL 20000
13 #define START_WAIT 100000
14
15 #include <sys/types.h>
16 #include <sys/ioctl.h>
17 #include <sys/resource.h>
18 #include <sys/stat.h>
19 #include <sys/termios.h>
20 #include <sys/time.h>
21 #include <sys/wait.h>
22 #include <ctype.h>
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <getopt.h>
26 #include <grp.h>
27 #include <pwd.h>
28 #include <signal.h>
29 #include <stddef.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34
35 #ifdef HAVE_PAM
36 #include <security/pam_appl.h>
37
38 /* We are not supporting authentication conversations */
39 static struct pam_conv conv = { NULL, NULL} ;
40 #endif
41
42 #include "einfo.h"
43 #include "rc.h"
44 #include "rc-misc.h"
45 #include "strlist.h"
46
47 typedef struct schedulelist
48 {
49 enum
50 {
51 schedule_timeout,
52 schedule_signal,
53 schedule_goto,
54 schedule_forever
55 } type;
56 int value;
57 struct schedulelist *gotolist;
58 struct schedulelist *next;
59 } schedulelist_t;
60 static schedulelist_t *schedule;
61
62 static char *progname;
63 static char *changeuser;
64 static char **newenv;
65
66 extern char **environ;
67
68 static void free_schedulelist (schedulelist_t **list)
69 {
70 schedulelist_t *here;
71 schedulelist_t *next;
72
73 for (here = *list; here; here = next) {
74 next = here->next;
75 free (here);
76 }
77
78 *list = NULL;
79 }
80
81 static void cleanup (void)
82 {
83 if (changeuser)
84 free (changeuser);
85
86 if (schedule)
87 free_schedulelist (&schedule);
88
89 if (newenv)
90 rc_strlist_free (newenv);
91 }
92
93 static int parse_signal (const char *sig)
94 {
95 typedef struct signalpair
96 {
97 const char *name;
98 int signal;
99 } signalpair_t;
100
101 static const signalpair_t signallist[] = {
102 { "ABRT", SIGABRT },
103 { "ALRM", SIGALRM },
104 { "FPE", SIGFPE },
105 { "HUP", SIGHUP },
106 { "ILL", SIGILL },
107 { "INT", SIGINT },
108 { "KILL", SIGKILL },
109 { "PIPE", SIGPIPE },
110 { "QUIT", SIGQUIT },
111 { "SEGV", SIGSEGV },
112 { "TERM", SIGTERM },
113 { "USR1", SIGUSR1 },
114 { "USR2", SIGUSR2 },
115 { "CHLD", SIGCHLD },
116 { "CONT", SIGCONT },
117 { "STOP", SIGSTOP },
118 { "TSTP", SIGTSTP },
119 { "TTIN", SIGTTIN },
120 { "TTOU", SIGTTOU }
121 };
122
123 unsigned int i = 0;
124 char *s;
125
126 if (! sig || strlen (sig) == 0)
127 return (-1);
128
129 if (sscanf (sig, "%u", &i) == 1) {
130 if (i > 0 && i < sizeof (signallist) / sizeof (signallist[0]))
131 return (i);
132 eerrorx ("%s: `%s' is not a valid signal", progname, sig);
133 }
134
135 if (strncmp (sig, "SIG", 3) == 0)
136 s = (char *) sig + 3;
137 else
138 s = NULL;
139
140 for (i = 0; i < sizeof (signallist) / sizeof (signallist[0]); i++)
141 if (strcmp (sig, signallist[i].name) == 0 ||
142 (s && strcmp (s, signallist[i].name) == 0))
143 return (signallist[i].signal);
144
145 eerrorx ("%s: `%s' is not a valid signal", progname, sig);
146 }
147
148 static void parse_schedule_item (schedulelist_t *item, const char *string)
149 {
150 const char *after_hyph;
151 int sig;
152
153 if (strcmp (string,"forever") == 0)
154 item->type = schedule_forever;
155 else if (isdigit (string[0])) {
156 item->type = schedule_timeout;
157 errno = 0;
158 if (sscanf (string, "%d", &item->value) != 1)
159 eerrorx ("%s: invalid timeout value in schedule `%s'", progname,
160 string);
161 } else if ((after_hyph = string + (string[0] == '-')) &&
162 ((sig = parse_signal (after_hyph)) != -1))
163 {
164 item->type = schedule_signal;
165 item->value = (int) sig;
166 }
167 else
168 eerrorx ("%s: invalid schedule item `%s'", progname, string);
169 }
170
171 static void parse_schedule (const char *string, int default_signal)
172 {
173 char buffer[20];
174 const char *slash;
175 int count = 0;
176 schedulelist_t *repeatat = NULL;
177 ptrdiff_t len;
178 schedulelist_t *next;
179
180 if (string)
181 for (slash = string; *slash; slash++)
182 if (*slash == '/')
183 count++;
184
185 if (schedule)
186 free_schedulelist (&schedule);
187
188 schedule = rc_xmalloc (sizeof (schedulelist_t));
189 schedule->gotolist = NULL;
190
191 if (count == 0) {
192 schedule->type = schedule_signal;
193 schedule->value = default_signal;
194 schedule->next = rc_xmalloc (sizeof (schedulelist_t));
195 next = schedule->next;
196 next->type = schedule_timeout;
197 next->gotolist = NULL;
198 if (string) {
199 if (sscanf (string, "%d", &next->value) != 1)
200 eerrorx ("%s: invalid timeout value in schedule", progname);
201 }
202 else
203 next->value = 5;
204 next->next = NULL;
205
206 return;
207 }
208
209 next = schedule;
210 while (string != NULL) {
211 if ((slash = strchr (string, '/')))
212 len = slash - string;
213 else
214 len = strlen (string);
215
216 if (len >= (ptrdiff_t) sizeof (buffer))
217 eerrorx ("%s: invalid schedule item, far too long", progname);
218
219 memcpy (buffer, string, len);
220 buffer[len] = 0;
221 string = slash ? slash + 1 : NULL;
222
223 parse_schedule_item (next, buffer);
224 if (next->type == schedule_forever) {
225 if (repeatat)
226 eerrorx ("%s: invalid schedule, `forever' appears more than once",
227 progname);
228
229 repeatat = next;
230 continue;
231 }
232
233 if (string) {
234 next->next = rc_xmalloc (sizeof (schedulelist_t));
235 next = next->next;
236 next->gotolist = NULL;
237 }
238 }
239
240 if (repeatat) {
241 next->next = rc_xmalloc (sizeof (schedulelist_t));
242 next = next->next;
243 next->type = schedule_goto;
244 next->value = 0;
245 next->gotolist = repeatat;
246 }
247
248 next->next = NULL;
249 return;
250 }
251
252 static pid_t get_pid (const char *pidfile, bool quiet)
253 {
254 FILE *fp;
255 pid_t pid;
256
257 if (! pidfile)
258 return (-1);
259
260 if ((fp = fopen (pidfile, "r")) == NULL) {
261 if (! quiet)
262 eerror ("%s: fopen `%s': %s", progname, pidfile, strerror (errno));
263 return (-1);
264 }
265
266 if (fscanf (fp, "%d", &pid) != 1) {
267 if (! quiet)
268 eerror ("%s: no pid found in `%s'", progname, pidfile);
269 fclose (fp);
270 return (-1);
271 }
272 fclose (fp);
273
274 return (pid);
275 }
276
277 /* return number of processed killed, -1 on error */
278 static int do_stop (const char *exec, const char *cmd,
279 const char *pidfile, uid_t uid,int sig,
280 bool quiet, bool verbose, bool test)
281 {
282 pid_t *pids;
283 bool killed;
284 int nkilled = 0;
285 pid_t pid = 0;
286 int i;
287
288 if (pidfile)
289 if ((pid = get_pid (pidfile, quiet)) == -1)
290 return (quiet ? 0 : -1);
291
292 if ((pids = rc_find_pids (exec, cmd, uid, pid)) == NULL)
293 return (0);
294
295 for (i = 0; pids[i]; i++) {
296 if (test) {
297 if (! quiet)
298 einfo ("Would send signal %d to PID %d", sig, pids[i]);
299 nkilled++;
300 continue;
301 }
302
303 if (verbose)
304 ebegin ("Sending signal %d to PID %d", sig, pids[i]);
305 errno = 0;
306 killed = (kill (pids[i], sig) == 0 || errno == ESRCH ? true : false);
307 if (! killed) {
308 if (! quiet)
309 eerror ("%s: failed to send signal %d to PID %d: %s",
310 progname, sig, pids[i], strerror (errno));
311 if (verbose)
312 eend (1, NULL);
313 nkilled = -1;
314 } else {
315 if (verbose)
316 eend (0, NULL);
317 if (nkilled != -1)
318 nkilled++;
319 }
320 }
321
322 free (pids);
323 return (nkilled);
324 }
325
326 static int run_stop_schedule (const char *exec, const char *cmd,
327 const char *pidfile, uid_t uid,
328 bool quiet, bool verbose, bool test)
329 {
330 schedulelist_t *item = schedule;
331 int nkilled = 0;
332 int tkilled = 0;
333 int nrunning = 0;
334 struct timeval tv;
335 struct timeval now;
336 struct timeval stopat;
337
338 if (verbose) {
339 if (pidfile)
340 einfo ("Will stop PID in pidfile `%s'", pidfile);
341 if (uid)
342 einfo ("Will stop processes owned by UID %d", uid);
343 if (exec)
344 einfo ("Will stop processes of `%s'", exec);
345 if (cmd)
346 einfo ("Will stop processes called `%s'", cmd);
347 }
348
349 while (item) {
350 switch (item->type) {
351 case schedule_goto:
352 item = item->gotolist;
353 continue;
354
355 case schedule_signal:
356 nrunning = 0;
357 nkilled = do_stop (exec, cmd, pidfile, uid, item->value,
358 quiet, verbose, test);
359 if (nkilled == 0) {
360 if (tkilled == 0) {
361 if (! quiet)
362 eerror ("%s: no matching processes found", progname);
363 }
364 return (tkilled);
365 }
366 else if (nkilled == -1)
367 return (0);
368
369 tkilled += nkilled;
370 break;
371 case schedule_timeout:
372 if (item->value < 1) {
373 item = NULL;
374 break;
375 }
376
377 if (gettimeofday (&stopat, NULL) != 0) {
378 eerror ("%s: gettimeofday: %s", progname, strerror (errno));
379 return (0);
380 }
381
382 stopat.tv_sec += item->value;
383 while (1) {
384 if ((nrunning = do_stop (exec, cmd, pidfile,
385 uid, 0, true, false, true)) == 0)
386 return (true);
387
388 tv.tv_sec = 0;
389 tv.tv_usec = POLL_INTERVAL;
390 if (select (0, 0, 0, 0, &tv) < 0) {
391 if (errno == EINTR)
392 eerror ("%s: caught an interupt", progname);
393 else
394 eerror ("%s: select: %s", progname, strerror (errno));
395 return (0);
396 }
397
398 if (gettimeofday (&now, NULL) != 0) {
399 eerror ("%s: gettimeofday: %s", progname, strerror (errno));
400 return (0);
401 }
402 if (timercmp (&now, &stopat, >))
403 break;
404 }
405 break;
406
407 default:
408 eerror ("%s: invalid schedule item `%d'", progname, item->type);
409 return (0);
410 }
411
412 if (item)
413 item = item->next;
414 }
415
416 if (test || (tkilled > 0 && nrunning == 0))
417 return (nkilled);
418
419 if (! quiet) {
420 if (nrunning == 1)
421 eerror ("%s: %d process refused to stop", progname, nrunning);
422 else
423 eerror ("%s: %d process(es) refused to stop", progname, nrunning);
424 }
425
426 return (-nrunning);
427 }
428
429 static void handle_signal (int sig)
430 {
431 int pid;
432 int status;
433 int serrno = errno;
434 char signame[10] = { '\0' };
435
436 switch (sig) {
437 case SIGINT:
438 if (! signame[0])
439 snprintf (signame, sizeof (signame), "SIGINT");
440 case SIGTERM:
441 if (! signame[0])
442 snprintf (signame, sizeof (signame), "SIGTERM");
443 case SIGQUIT:
444 if (! signame[0])
445 snprintf (signame, sizeof (signame), "SIGQUIT");
446 eerrorx ("%s: caught %s, aborting", progname, signame);
447
448 case SIGCHLD:
449 while (1) {
450 if ((pid = waitpid (-1, &status, WNOHANG)) < 0) {
451 if (errno != ECHILD)
452 eerror ("%s: waitpid: %s", progname, strerror (errno));
453 break;
454 }
455 }
456 break;
457
458 default:
459 eerror ("%s: caught unknown signal %d", progname, sig);
460 }
461
462 /* Restore errno */
463 errno = serrno;
464 }
465
466 int main (int argc, char **argv)
467 {
468 int devnull_fd = -1;
469
470 #ifdef TIOCNOTTY
471 int tty_fd = -1;
472 #endif
473 #ifdef HAVE_PAM
474 pam_handle_t *pamh = NULL;
475 int pamr;
476 #endif
477
478 static struct option longopts[] = {
479 { "stop", 0, NULL, 'K'},
480 { "nicelevel", 1, NULL, 'N'},
481 { "retry", 1, NULL, 'R'},
482 { "start", 0, NULL, 'S'},
483 { "background", 0, NULL, 'b'},
484 { "chuid", 1, NULL, 'c'},
485 { "chdir", 1, NULL, 'd'},
486 { "group", 1, NULL, 'g'},
487 { "make-pidfile", 0, NULL, 'm'},
488 { "name", 1, NULL, 'n'},
489 { "oknodo", 0, NULL, 'o'},
490 { "pidfile", 1, NULL, 'p'},
491 { "quiet", 0, NULL, 'q'},
492 { "signal", 1, NULL, 's'},
493 { "test", 0, NULL, 't'},
494 { "user", 1, NULL, 'u'},
495 { "chroot", 1, NULL, 'r'},
496 { "verbose", 0, NULL, 'v'},
497 { "exec", 1, NULL, 'x'},
498 { "stdout", 1, NULL, '1'},
499 { "stderr", 1, NULL, '2'},
500 { NULL, 0, NULL, 0}
501 };
502 int c;
503 bool start = false;
504 bool stop = false;
505 bool oknodo = false;
506 bool test = false;
507 bool quiet = false;
508 bool verbose = false;
509 char *exec = NULL;
510 char *cmd = NULL;
511 char *pidfile = NULL;
512 int sig = SIGTERM;
513 uid_t uid = 0;
514 int nicelevel = 0;
515 bool background = false;
516 bool makepidfile = false;
517 uid_t ch_uid = 0;
518 gid_t ch_gid = 0;
519 char *ch_root = NULL;
520 char *ch_dir = NULL;
521 int tid = 0;
522 char *redirect_stderr = NULL;
523 char *redirect_stdout = NULL;
524 int stdout_fd;
525 int stderr_fd;
526 pid_t pid;
527 struct timeval tv;
528 int i;
529 char *svcname = getenv ("SVCNAME");
530 char *env;
531
532 progname = argv[0];
533 atexit (cleanup);
534
535 signal (SIGINT, handle_signal);
536 signal (SIGQUIT, handle_signal);
537 signal (SIGTERM, handle_signal);
538
539 while ((c = getopt_long (argc, argv,
540 "KN:R:Sbc:d:g:mn:op:qs:tu:r:vx:1:2:",
541 longopts, (int *) 0)) != -1)
542 switch (c) {
543 case 'K': /* --stop */
544 stop = true;
545 break;
546
547 case 'N': /* --nice */
548 if (sscanf (optarg, "%d", &nicelevel) != 1)
549 eerrorx ("%s: invalid nice level `%s'", progname, optarg);
550 break;
551
552 case 'R': /* --retry <schedule>|<timeout> */
553 parse_schedule (optarg, sig);
554 break;
555
556 case 'S': /* --start */
557 start = true;
558 break;
559
560 case 'b': /* --background */
561 background = true;
562 break;
563
564 case 'c': /* --chuid <username>|<uid> */
565 /* we copy the string just in case we need the
566 * argument later. */
567 {
568 char *p = optarg;
569 char *cu = strsep (&p, ":");
570 changeuser = strdup (cu);
571 if (sscanf (cu, "%d", &tid) != 1) {
572 struct passwd *pw = getpwnam (cu);
573 if (! pw)
574 eerrorx ("%s: user `%s' not found", progname, cu);
575 ch_uid = pw->pw_uid;
576 } else
577 ch_uid = tid;
578 if (p) {
579 char *cg = strsep (&p, ":");
580 if (sscanf (cg, "%d", &tid) != 1) {
581 struct group *gr = getgrnam (cg);
582 if (! gr)
583 eerrorx ("%s: group `%s' not found", progname, cg);
584 ch_gid = gr->gr_gid;
585 } else
586 ch_gid = tid;
587 }
588 }
589 break;
590
591 case 'd': /* --chdir /new/dir */
592 ch_dir = optarg;
593 break;
594
595 case 'g': /* --group <group>|<gid> */
596 if (sscanf (optarg, "%d", &tid) != 1) {
597 struct group *gr = getgrnam (optarg);
598 if (! gr)
599 eerrorx ("%s: group `%s' not found", progname, optarg);
600 ch_gid = gr->gr_gid;
601 } else
602 ch_gid = tid;
603 break;
604
605 case 'm': /* --make-pidfile */
606 makepidfile = true;
607 break;
608
609 case 'n': /* --name <process-name> */
610 cmd = optarg;
611 break;
612
613 case 'o': /* --oknodo */
614 oknodo = true;
615 break;
616
617 case 'p': /* --pidfile <pid-file> */
618 pidfile = optarg;
619 break;
620
621 case 'q': /* --quiet */
622 quiet = true;
623 break;
624
625 case 's': /* --signal <signal> */
626 sig = parse_signal (optarg);
627 break;
628
629 case 't': /* --test */
630 test = true;
631 break;
632
633 case 'u': /* --user <username>|<uid> */
634 if (sscanf (optarg, "%d", &tid) != 1) {
635 struct passwd *pw = getpwnam (optarg);
636 if (! pw)
637 eerrorx ("%s: user `%s' not found", progname, optarg);
638 uid = pw->pw_uid;
639 } else
640 uid = tid;
641 break;
642
643 case 'r': /* --chroot /new/root */
644 ch_root = optarg;
645 break;
646
647 case 'v': /* --verbose */
648 verbose = true;
649 break;
650
651 case 'x': /* --exec <executable> */
652 exec = optarg;
653 break;
654
655 case '1': /* --stdout /path/to/stdout.lgfile */
656 redirect_stdout = optarg;
657 break;
658
659 case '2': /* --stderr /path/to/stderr.logfile */
660 redirect_stderr = optarg;
661 break;
662
663 default:
664 exit (EXIT_FAILURE);
665 }
666
667 /* Respect RC as well as how we are called */
668 if (rc_is_env ("RC_QUIET", "yes") && ! verbose)
669 quiet = true;
670
671 if (start == stop)
672 eerrorx ("%s: need one of --start or --stop", progname);
673
674 if (start && ! exec)
675 eerrorx ("%s: --start needs --exec", progname);
676
677 if (stop && ! exec && ! pidfile && ! cmd && ! uid)
678 eerrorx ("%s: --stop needs --exec, --pidfile, --name or --user", progname);
679
680 if (makepidfile && ! pidfile)
681 eerrorx ("%s: --make-pidfile is only relevant with --pidfile", progname);
682
683 if (background && ! start)
684 eerrorx ("%s: --background is only relevant with --start", progname);
685
686 if ((redirect_stdout || redirect_stderr) && ! background)
687 eerrorx ("%s: --stdout and --stderr are only relevant with --background",
688 progname);
689
690 argc -= optind;
691 argv += optind;
692
693 /* Validate that the binary rc_exists if we are starting */
694 if (exec && start) {
695 char *tmp;
696 if (ch_root)
697 tmp = rc_strcatpaths (ch_root, exec, (char *) NULL);
698 else
699 tmp = exec;
700 if (! rc_is_file (tmp)) {
701 eerror ("%s: %s does not exist", progname, tmp);
702 if (ch_root)
703 free (tmp);
704 exit (EXIT_FAILURE);
705 }
706 if (ch_root)
707 free (tmp);
708 }
709
710 if (stop) {
711 int result;
712
713 if (! schedule) {
714 if (test || oknodo)
715 parse_schedule ("0", sig);
716 else
717 parse_schedule (NULL, sig);
718 }
719
720 result = run_stop_schedule (exec, cmd, pidfile, uid, quiet, verbose, test);
721 if (test || oknodo)
722 return (result > 0 ? EXIT_SUCCESS : EXIT_FAILURE);
723 if (result < 1)
724 exit (result == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
725
726 if (pidfile && rc_is_file (pidfile))
727 unlink (pidfile);
728
729 if (svcname)
730 rc_set_service_daemon (svcname, exec, cmd, pidfile, false);
731
732 exit (EXIT_SUCCESS);
733 }
734
735 if (do_stop (exec, cmd, pidfile, uid, 0, true, false, true) > 0)
736 eerrorx ("%s: %s is already running", progname, exec);
737
738 if (test) {
739 if (quiet)
740 exit (EXIT_SUCCESS);
741
742 einfon ("Would start %s", exec);
743 while (argc-- > 0)
744 printf("%s ", *argv++);
745 printf ("\n");
746 eindent ();
747 if (ch_uid != 0)
748 einfo ("as user %d", ch_uid);
749 if (ch_gid != 0)
750 einfo ("as group %d", ch_gid);
751 if (ch_root)
752 einfo ("in root `%s'", ch_root);
753 if (ch_dir)
754 einfo ("in dir `%s'", ch_dir);
755 if (nicelevel != 0)
756 einfo ("with a priority of %d", nicelevel);
757 eoutdent ();
758 exit (EXIT_SUCCESS);
759 }
760
761 /* Ensure this is unset, so if the daemon does /etc/init.d/foo
762 Then we filter the environment accordingly */
763 unsetenv ("RC_SOFTLEVEL");
764
765 if (verbose) {
766 ebegin ("Detaching to start `%s'", exec);
767 eindent ();
768 }
769
770 if (background)
771 signal (SIGCHLD, handle_signal);
772
773 *--argv = exec;
774 if ((pid = fork ()) == -1)
775 eerrorx ("%s: fork: %s", progname, strerror (errno));
776
777 /* Child process - lets go! */
778 if (pid == 0) {
779 pid_t mypid = getpid ();
780
781 #ifdef TIOCNOTTY
782 tty_fd = open("/dev/tty", O_RDWR);
783 #endif
784
785 devnull_fd = open("/dev/null", O_RDWR);
786
787 if (nicelevel) {
788 if (setpriority (PRIO_PROCESS, mypid, nicelevel) == -1)
789 eerrorx ("%s: setpritory %d: %s", progname, nicelevel,
790 strerror(errno));
791 }
792
793 if (ch_root && chroot (ch_root) < 0)
794 eerrorx ("%s: chroot `%s': %s", progname, ch_root, strerror (errno));
795
796 if (ch_dir && chdir (ch_dir) < 0)
797 eerrorx ("%s: chdir `%s': %s", progname, ch_dir, strerror (errno));
798
799 if (makepidfile && pidfile) {
800 FILE *fp = fopen (pidfile, "w");
801 if (! fp)
802 eerrorx ("%s: fopen `%s': %s", progname, pidfile, strerror
803 (errno));
804 fprintf (fp, "%d\n", mypid);
805 fclose (fp);
806 }
807
808 #ifdef HAVE_PAM
809 if (changeuser != NULL)
810 pamr = pam_start ("start-stop-daemon", changeuser, &conv, &pamh);
811 else
812 pamr = pam_start ("start-stop-daemon", "nobody", &conv, &pamh);
813
814 if (pamr == PAM_SUCCESS)
815 pamr = pam_authenticate (pamh, PAM_SILENT);
816 if (pamr == PAM_SUCCESS)
817 pamr = pam_acct_mgmt (pamh, PAM_SILENT);
818 if (pamr == PAM_SUCCESS)
819 pamr = pam_open_session (pamh, PAM_SILENT);
820 if (pamr != PAM_SUCCESS)
821 eerrorx ("%s: pam error: %s", progname, pam_strerror(pamh, pamr));
822 #endif
823
824 if ((ch_gid) && setgid(ch_gid))
825 eerrorx ("%s: unable to set groupid to %d", progname, ch_gid);
826 if (changeuser && ch_gid)
827 if (initgroups (changeuser, ch_gid))
828 eerrorx ("%s: initgroups (%s, %d)", progname, changeuser, ch_gid);
829 if (ch_uid && setuid (ch_uid))
830 eerrorx ("%s: unable to set userid to %d", progname, ch_uid);
831 else {
832 struct passwd *passwd = getpwuid (ch_uid);
833 if (passwd) {
834 unsetenv ("HOME");
835 if (passwd->pw_dir)
836 setenv ("HOME", passwd->pw_dir, 1);
837 unsetenv ("USER");
838 if (passwd->pw_name)
839 setenv ("USER", passwd->pw_name, 1);
840 }
841 }
842
843 /* Close any fd's to the passwd database */
844 endpwent ();
845
846 #ifdef TIOCNOTTY
847 ioctl(tty_fd, TIOCNOTTY, 0);
848 close(tty_fd);
849 #endif
850
851 /* Clean the environment of any RC_ variables */
852 STRLIST_FOREACH (environ, env, i)
853 if (env && strncmp (env, "RC_", 3) != 0) {
854 /* For the path character, remove the rcscript bin dir from it */
855 if (strncmp (env, "PATH=" RC_LIBDIR "bin:",
856 strlen ("PATH=" RC_LIBDIR "bin:")) == 0)
857 {
858 char *path = env;
859 char *newpath;
860 int len;
861 path += strlen ("PATH=" RC_LIBDIR "bin:");
862 len = sizeof (char *) * strlen (path) + 6;
863 newpath = rc_xmalloc (len);
864 snprintf (newpath, len, "PATH=%s", path);
865 newenv = rc_strlist_add (newenv, newpath);
866 free (newpath);
867 } else
868 newenv = rc_strlist_add (newenv, env);
869 }
870
871 umask (022);
872
873 stdout_fd = devnull_fd;
874 stderr_fd = devnull_fd;
875 if (redirect_stdout) {
876 if ((stdout_fd = open (redirect_stdout, O_WRONLY | O_CREAT | O_APPEND,
877 S_IRUSR | S_IWUSR)) == -1)
878 eerrorx ("%s: unable to open the logfile for stdout `%s': %s",
879 progname, redirect_stdout, strerror (errno));
880 }
881 if (redirect_stderr) {
882 if ((stderr_fd = open (redirect_stderr, O_WRONLY | O_CREAT | O_APPEND,
883 S_IRUSR | S_IWUSR)) == -1)
884 eerrorx ("%s: unable to open the logfile for stderr `%s': %s",
885 progname, redirect_stderr, strerror (errno));
886 }
887
888 if (background) {
889 /* Hmmm, some daemons may need stdin? */
890 dup2 (devnull_fd, STDIN_FILENO);
891 dup2 (stdout_fd, STDOUT_FILENO);
892 dup2 (stderr_fd, STDERR_FILENO);
893 }
894
895 for (i = getdtablesize () - 1; i >= 3; --i)
896 close(i);
897
898 setsid ();
899
900 execve (exec, argv, newenv);
901 #ifdef HAVE_PAM
902 if (pamr == PAM_SUCCESS)
903 pam_close_session (pamh, PAM_SILENT);
904 #endif
905 eerrorx ("%s: failed to exec `%s': %s", progname, exec, strerror (errno));
906 }
907
908 /* Parent process */
909 if (! background) {
910 /* As we're not backgrounding the process, wait for our pid to return */
911 int status = 0;
912 int savepid = pid;
913
914 errno = 0;
915 do {
916 pid = waitpid (savepid, &status, 0);
917 if (pid < 1) {
918 eerror ("waitpid %d: %s", savepid, strerror (errno));
919 return (-1);
920 }
921 } while (! WIFEXITED (status) && ! WIFSIGNALED (status));
922
923 if (! WIFEXITED (status) || WEXITSTATUS (status) != 0) {
924 if (! quiet)
925 eerrorx ("%s: failed to started `%s'", progname, exec);
926 exit (EXIT_FAILURE);
927 }
928
929 pid = savepid;
930 }
931
932 /* Wait a little bit and check that process is still running
933 We do this as some badly written daemons fork and then barf */
934 if (START_WAIT > 0) {
935 struct timeval stopat;
936 struct timeval now;
937
938 if (gettimeofday (&stopat, NULL) != 0)
939 eerrorx ("%s: gettimeofday: %s", progname, strerror (errno));
940
941 stopat.tv_usec += START_WAIT;
942 while (1) {
943 bool alive = false;
944
945 tv.tv_sec = 0;
946 tv.tv_usec = POLL_INTERVAL;
947 if (select (0, 0, 0, 0, &tv) < 0) {
948 /* Let our signal handler handle the interupt */
949 if (errno != EINTR)
950 eerrorx ("%s: select: %s", progname, strerror (errno));
951 }
952
953 if (gettimeofday (&now, NULL) != 0)
954 eerrorx ("%s: gettimeofday: %s", progname, strerror (errno));
955
956 /* This is knarly.
957 If we backgrounded then we know the exact pid.
958 Otherwise if we have a pidfile then it *may* know the exact pid.
959 Failing that, we'll have to query processes.
960 We sleep first as some programs like ntp like to fork, and write
961 their pidfile a LONG time later. */
962 if (background) {
963 if (kill (pid, 0) == 0)
964 alive = true;
965 } else {
966 if (pidfile && rc_exists (pidfile)) {
967 if (do_stop (NULL, NULL, pidfile, uid, 0, true, false, true) > 0)
968 alive = true;
969 } else {
970 if (do_stop (exec, cmd, NULL, uid, 0, true, false, true) > 0)
971 alive = true;
972 }
973 }
974
975 if (! alive)
976 eerrorx ("%s: %s died", progname, exec);
977
978 if (timercmp (&now, &stopat, >))
979 break;
980 }
981 }
982
983 if (svcname)
984 rc_set_service_daemon (svcname, exec, cmd, pidfile, true);
985
986 exit (EXIT_SUCCESS);
987 }

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