/[baselayout]/trunk/src/start-stop-daemon.c
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Revision 2549 - (hide annotations) (download) (as text)
Thu Apr 5 15:01:09 2007 UTC (11 years, 5 months ago) by uberlord
File MIME type: text/x-csrc
File size: 23733 byte(s)
We now compile on OpenBSD (no idea if it works or not yet)
1 uberlord 2547 /*
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 uberlord 2549 #include <sys/types.h>
16     #include <sys/ioctl.h>
17 uberlord 2547 #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     {
75     next = here->next;
76     free (here);
77     }
78    
79     *list = NULL;
80     }
81    
82     static void cleanup (void)
83     {
84     if (changeuser)
85     free (changeuser);
86    
87     if (schedule)
88     free_schedulelist (&schedule);
89    
90     if (newenv)
91     rc_strlist_free (newenv);
92     }
93    
94     static int parse_signal (const char *sig)
95     {
96     typedef struct signalpair
97     {
98     const char *name;
99     int signal;
100     } signalpair_t;
101    
102     static const signalpair_t signallist[] = {
103     { "ABRT", SIGABRT },
104     { "ALRM", SIGALRM },
105     { "FPE", SIGFPE },
106     { "HUP", SIGHUP },
107     { "ILL", SIGILL },
108     { "INT", SIGINT },
109     { "KILL", SIGKILL },
110     { "PIPE", SIGPIPE },
111     { "QUIT", SIGQUIT },
112     { "SEGV", SIGSEGV },
113     { "TERM", SIGTERM },
114     { "USR1", SIGUSR1 },
115     { "USR2", SIGUSR2 },
116     { "CHLD", SIGCHLD },
117     { "CONT", SIGCONT },
118     { "STOP", SIGSTOP },
119     { "TSTP", SIGTSTP },
120     { "TTIN", SIGTTIN },
121     { "TTOU", SIGTTOU }
122     };
123    
124     unsigned int i = 0;
125     char *s;
126    
127     if (! sig || strlen (sig) == 0)
128     return (-1);
129    
130     if (sscanf (sig, "%u", &i) == 1)
131     {
132     if (i > 0 && i < sizeof (signallist) / sizeof (signallist[0]))
133     return (i);
134     eerrorx ("%s: `%s' is not a valid signal", progname, sig);
135     }
136    
137     if (strncmp (sig, "SIG", 3) == 0)
138     s = (char *) sig + 3;
139     else
140     s = NULL;
141    
142     for (i = 0; i < sizeof (signallist) / sizeof (signallist[0]); i++)
143     if (strcmp (sig, signallist[i].name) == 0 ||
144     (s && strcmp (s, signallist[i].name) == 0))
145     return (signallist[i].signal);
146    
147     eerrorx ("%s: `%s' is not a valid signal", progname, sig);
148     }
149    
150     static void parse_schedule_item (schedulelist_t *item, const char *string)
151     {
152     const char *after_hyph;
153     int sig;
154    
155     if (strcmp (string,"forever") == 0)
156     item->type = schedule_forever;
157     else if (isdigit (string[0]))
158     {
159     item->type = schedule_timeout;
160     errno = 0;
161     if (sscanf (string, "%d", &item->value) != 1)
162     eerrorx ("%s: invalid timeout value in schedule `%s'", progname,
163     string);
164     }
165     else if ((after_hyph = string + (string[0] == '-')) &&
166     ((sig = parse_signal (after_hyph)) != -1))
167     {
168     item->type = schedule_signal;
169     item->value = (int) sig;
170     }
171     else
172     eerrorx ("%s: invalid schedule item `%s'", progname, string);
173     }
174    
175     static void parse_schedule (const char *string, int default_signal)
176     {
177     char buffer[20];
178     const char *slash;
179     int count = 0;
180     schedulelist_t *repeatat = NULL;
181     ptrdiff_t len;
182     schedulelist_t *next;
183    
184     if (string)
185     for (slash = string; *slash; slash++)
186     if (*slash == '/')
187     count++;
188    
189     if (schedule)
190     free_schedulelist (&schedule);
191    
192     schedule = rc_xmalloc (sizeof (schedulelist_t));
193     schedule->gotolist = NULL;
194    
195     if (count == 0)
196     {
197     schedule->type = schedule_signal;
198     schedule->value = default_signal;
199     schedule->next = rc_xmalloc (sizeof (schedulelist_t));
200     next = schedule->next;
201     next->type = schedule_timeout;
202     next->gotolist = NULL;
203     if (string)
204     {
205     if (sscanf (string, "%d", &next->value) != 1)
206     eerrorx ("%s: invalid timeout value in schedule", progname);
207     }
208     else
209     next->value = 5;
210     next->next = NULL;
211    
212     return;
213     }
214    
215     next = schedule;
216     while (string != NULL)
217     {
218     if ((slash = strchr (string, '/')))
219     len = slash - string;
220     else
221     len = strlen (string);
222    
223     if (len >= (ptrdiff_t) sizeof (buffer))
224     eerrorx ("%s: invalid schedule item, far too long", progname);
225    
226     memcpy (buffer, string, len);
227     buffer[len] = 0;
228     string = slash ? slash + 1 : NULL;
229    
230     parse_schedule_item (next, buffer);
231     if (next->type == schedule_forever)
232     {
233     if (repeatat)
234     eerrorx ("%s: invalid schedule, `forever' appears more than once",
235     progname);
236    
237     repeatat = next;
238     continue;
239     }
240    
241     if (string)
242     {
243     next->next = rc_xmalloc (sizeof (schedulelist_t));
244     next = next->next;
245     next->gotolist = NULL;
246     }
247     }
248    
249     if (repeatat)
250     {
251     next->next = rc_xmalloc (sizeof (schedulelist_t));
252     next = next->next;
253     next->type = schedule_goto;
254     next->value = 0;
255     next->gotolist = repeatat;
256     }
257    
258     next->next = NULL;
259     return;
260     }
261    
262     static pid_t get_pid (const char *pidfile, bool quiet)
263     {
264     FILE *fp;
265     pid_t pid;
266    
267     if (! pidfile)
268     return (-1);
269    
270     if ((fp = fopen (pidfile, "r")) == NULL)
271     {
272     if (! quiet)
273     eerror ("%s: fopen `%s': %s", progname, pidfile, strerror (errno));
274     return (-1);
275     }
276    
277     if (fscanf (fp, "%d", &pid) != 1)
278     {
279     if (! quiet)
280     eerror ("%s: no pid found in `%s'", progname, pidfile);
281     fclose (fp);
282     return (-1);
283     }
284     fclose (fp);
285    
286     return (pid);
287     }
288    
289     /* return number of processed killed, -1 on error */
290     static int do_stop (const char *exec, const char *cmd,
291     const char *pidfile, uid_t uid,int sig,
292     bool quiet, bool verbose, bool test)
293     {
294     pid_t *pids;
295     bool killed;
296     int nkilled = 0;
297     pid_t pid = 0;
298     int i;
299    
300     if (pidfile)
301     if ((pid = get_pid (pidfile, quiet)) == -1)
302     return (quiet ? 0 : -1);
303    
304     if ((pids = rc_find_pids (exec, cmd, uid, pid)) == NULL)
305     return (0);
306    
307     for (i = 0; pids[i]; i++)
308     {
309     if (test)
310     {
311     if (! quiet)
312     einfo ("Would send signal %d to PID %d", sig, pids[i]);
313     nkilled++;
314     continue;
315     }
316    
317     if (verbose)
318     ebegin ("Sending signal %d to PID %d", sig, pids[i]);
319     errno = 0;
320     killed = (kill (pids[i], sig) == 0 || errno == ESRCH ? true : false);
321     if (! killed)
322     {
323     if (! quiet)
324     eerror ("%s: failed to send signal %d to PID %d: %s",
325     progname, sig, pids[i], strerror (errno));
326     if (verbose)
327     eend (1, NULL);
328     nkilled = -1;
329     }
330     else
331     {
332     if (verbose)
333     eend (0, NULL);
334     if (nkilled != -1)
335     nkilled++;
336     }
337     }
338    
339     free (pids);
340     return (nkilled);
341     }
342    
343     static int run_stop_schedule (const char *exec, const char *cmd,
344     const char *pidfile, uid_t uid,
345     bool quiet, bool verbose, bool test)
346     {
347     schedulelist_t *item = schedule;
348     int nkilled = 0;
349     int tkilled = 0;
350     int nrunning = 0;
351     struct timeval tv;
352     struct timeval now;
353     struct timeval stopat;
354    
355     if (verbose)
356     {
357     if (pidfile)
358     einfo ("Will stop PID in pidfile `%s'", pidfile);
359     if (uid)
360     einfo ("Will stop processes owned by UID %d", uid);
361     if (exec)
362     einfo ("Will stop processes of `%s'", exec);
363     if (cmd)
364     einfo ("Will stop processes called `%s'", cmd);
365     }
366    
367     while (item)
368     {
369     switch (item->type)
370     {
371     case schedule_goto:
372     item = item->gotolist;
373     continue;
374    
375     case schedule_signal:
376     nrunning = 0;
377     nkilled = do_stop (exec, cmd, pidfile, uid, item->value,
378     quiet, verbose, test);
379     if (nkilled == 0)
380     {
381     if (tkilled == 0)
382     {
383     if (! quiet)
384     eerror ("%s: no matching processes found", progname);
385     }
386     return (tkilled);
387     }
388     else if (nkilled == -1)
389     return (0);
390    
391     tkilled += nkilled;
392     break;
393     case schedule_timeout:
394     if (item->value < 1)
395     {
396     item = NULL;
397     break;
398     }
399    
400     if (gettimeofday (&stopat, NULL) != 0)
401     {
402     eerror ("%s: gettimeofday: %s", progname, strerror (errno));
403     return (0);
404     }
405    
406     stopat.tv_sec += item->value;
407     while (1)
408     {
409     if ((nrunning = do_stop (exec, cmd, pidfile,
410     uid, 0, true, false, true)) == 0)
411     return (true);
412    
413     tv.tv_sec = 0;
414     tv.tv_usec = POLL_INTERVAL;
415     if (select (0, 0, 0, 0, &tv) < 0)
416     {
417     if (errno == EINTR)
418     eerror ("%s: caught an interupt", progname);
419     else
420     eerror ("%s: select: %s", progname, strerror (errno));
421     return (0);
422     }
423    
424     if (gettimeofday (&now, NULL) != 0)
425     {
426     eerror ("%s: gettimeofday: %s", progname, strerror (errno));
427     return (0);
428     }
429     if (timercmp (&now, &stopat, >))
430     break;
431     }
432     break;
433    
434     default:
435     eerror ("%s: invalid schedule item `%d'", progname, item->type);
436     return (0);
437     }
438    
439     if (item)
440     item = item->next;
441     }
442    
443     if (test || (tkilled > 0 && nrunning == 0))
444     return (nkilled);
445    
446     if (! quiet)
447     {
448     if (nrunning == 1)
449     eerror ("%s: %d process refused to stop", progname, nrunning);
450     else
451     eerror ("%s: %d process(es) refused to stop", progname, nrunning);
452     }
453    
454     return (-nrunning);
455     }
456    
457     static void handle_signal (int sig)
458     {
459     int pid;
460     int status;
461     int serrno = errno;
462    
463     switch (sig)
464     {
465     case SIGINT:
466     case SIGTERM:
467     case SIGQUIT:
468     eerrorx ("%s: caught signal %d, aborting", progname, sig);
469    
470     case SIGCHLD:
471     while (1)
472     {
473     if ((pid = waitpid (-1, &status, WNOHANG)) < 0)
474     {
475     if (errno != ECHILD)
476     eerror ("%s: waitpid: %s", progname, strerror (errno));
477     break;
478     }
479     }
480     break;
481    
482     default:
483     eerror ("%s: caught unknown signal %d", progname, sig);
484     }
485    
486     /* Restore errno */
487     errno = serrno;
488     }
489    
490     int main (int argc, char **argv)
491     {
492     int devnull_fd = -1;
493    
494     #ifdef TIOCNOTTY
495     int tty_fd = -1;
496     #endif
497     #ifdef HAVE_PAM
498     pam_handle_t *pamh = NULL;
499     int pamr;
500     #endif
501    
502     static struct option longopts[] = {
503     { "stop", 0, NULL, 'K'},
504     { "nicelevel", 1, NULL, 'N'},
505     { "retry", 1, NULL, 'R'},
506     { "start", 0, NULL, 'S'},
507     { "background", 0, NULL, 'b'},
508     { "chuid", 1, NULL, 'c'},
509     { "chdir", 1, NULL, 'd'},
510     { "group", 1, NULL, 'g'},
511     { "make-pidfile", 0, NULL, 'm'},
512     { "name", 1, NULL, 'n'},
513     { "oknodo", 0, NULL, 'o'},
514     { "pidfile", 1, NULL, 'p'},
515     { "quiet", 0, NULL, 'q'},
516     { "signal", 1, NULL, 's'},
517     { "test", 0, NULL, 't'},
518     { "user", 1, NULL, 'u'},
519     { "chroot", 1, NULL, 'r'},
520     { "verbose", 0, NULL, 'v'},
521     { "exec", 1, NULL, 'x'},
522     { "stdout", 1, NULL, '1'},
523     { "stderr", 1, NULL, '2'},
524     { NULL, 0, NULL, 0}
525     };
526     int c;
527     bool start = false;
528     bool stop = false;
529     bool oknodo = false;
530     bool test = false;
531     bool quiet = false;
532     bool verbose = false;
533     char *exec = NULL;
534     char *cmd = NULL;
535     char *pidfile = NULL;
536     int sig = SIGTERM;
537     uid_t uid = 0;
538     int nicelevel = 0;
539     bool background = false;
540     bool makepidfile = false;
541     uid_t ch_uid = 0;
542     gid_t ch_gid = 0;
543     char *ch_root = NULL;
544     char *ch_dir = NULL;
545     int tid = 0;
546     char *redirect_stderr = NULL;
547     char *redirect_stdout = NULL;
548     int stdout_fd;
549     int stderr_fd;
550     pid_t pid;
551     struct timeval tv;
552     int i;
553     char *svcname = getenv ("SVCNAME");
554     char *env;
555    
556     progname = argv[0];
557     atexit (cleanup);
558    
559     signal (SIGINT, handle_signal);
560     signal (SIGQUIT, handle_signal);
561     signal (SIGTERM, handle_signal);
562    
563     while ((c = getopt_long (argc, argv,
564     "KN:R:Sbc:d:g:mn:op:qs:tu:r:vx:1:2:",
565     longopts, (int *) 0)) != -1)
566     switch (c)
567     {
568     case 'K': /* --stop */
569     stop = true;
570     break;
571    
572     case 'N': /* --nice */
573     if (sscanf (optarg, "%d", &nicelevel) != 1)
574     eerrorx ("%s: invalid nice level `%s'", progname, optarg);
575     break;
576    
577     case 'R': /* --retry <schedule>|<timeout> */
578     parse_schedule (optarg, sig);
579     break;
580    
581     case 'S': /* --start */
582     start = true;
583     break;
584    
585     case 'b': /* --background */
586     background = true;
587     break;
588    
589     case 'c': /* --chuid <username>|<uid> */
590     /* we copy the string just in case we need the
591     * argument later. */
592     {
593     char *p = optarg;
594     char *cu = strsep (&p, ":");
595     changeuser = strdup (cu);
596     if (sscanf (cu, "%d", &tid) != 1)
597     {
598     struct passwd *pw = getpwnam (cu);
599     if (! pw)
600     eerrorx ("%s: user `%s' not found", progname, cu);
601     ch_uid = pw->pw_uid;
602     }
603     else
604     ch_uid = tid;
605     if (p)
606     {
607     char *cg = strsep (&p, ":");
608     if (sscanf (cg, "%d", &tid) != 1)
609     {
610     struct group *gr = getgrnam (cg);
611     if (! gr)
612     eerrorx ("%s: group `%s' not found", progname, cg);
613     ch_gid = gr->gr_gid;
614     }
615     else
616     ch_gid = tid;
617     }
618     }
619     break;
620    
621     case 'd': /* --chdir /new/dir */
622     ch_dir = optarg;
623     break;
624    
625     case 'g': /* --group <group>|<gid> */
626     if (sscanf (optarg, "%d", &tid) != 1)
627     {
628     struct group *gr = getgrnam (optarg);
629     if (! gr)
630     eerrorx ("%s: group `%s' not found", progname, optarg);
631     ch_gid = gr->gr_gid;
632     }
633     else
634     ch_gid = tid;
635     break;
636    
637     case 'm': /* --make-pidfile */
638     makepidfile = true;
639     break;
640    
641     case 'n': /* --name <process-name> */
642     cmd = optarg;
643     break;
644    
645     case 'o': /* --oknodo */
646     oknodo = true;
647     break;
648    
649     case 'p': /* --pidfile <pid-file> */
650     pidfile = optarg;
651     break;
652    
653     case 'q': /* --quiet */
654     quiet = true;
655     break;
656    
657     case 's': /* --signal <signal> */
658     sig = parse_signal (optarg);
659     break;
660    
661     case 't': /* --test */
662     test = true;
663     break;
664    
665     case 'u': /* --user <username>|<uid> */
666     if (sscanf (optarg, "%d", &tid) != 1)
667     {
668     struct passwd *pw = getpwnam (optarg);
669     if (! pw)
670     eerrorx ("%s: user `%s' not found", progname, optarg);
671     uid = pw->pw_uid;
672     }
673     else
674     uid = tid;
675     break;
676    
677     case 'r': /* --chroot /new/root */
678     ch_root = optarg;
679     break;
680    
681     case 'v': /* --verbose */
682     verbose = true;
683     break;
684    
685     case 'x': /* --exec <executable> */
686     exec = optarg;
687     break;
688    
689     case '1': /* --stdout /path/to/stdout.lgfile */
690     redirect_stdout = optarg;
691     break;
692    
693     case '2': /* --stderr /path/to/stderr.logfile */
694     redirect_stderr = optarg;
695     break;
696    
697     default:
698     exit (EXIT_FAILURE);
699     }
700    
701     /* Respect RC as well as how we are called */
702     if (rc_is_env ("RC_QUIET", "yes") && ! verbose)
703     quiet = true;
704    
705     if (start == stop)
706     eerrorx ("%s: need one of --start or --stop", progname);
707    
708     if (start && ! exec)
709     eerrorx ("%s: --start needs --exec", progname);
710    
711     if (stop && ! exec && ! pidfile && ! cmd && ! uid)
712     eerrorx ("%s: --stop needs --exec, --pidfile, --name or --user", progname);
713    
714     if (makepidfile && ! pidfile)
715     eerrorx ("%s: --make-pidfile is only relevant with --pidfile", progname);
716    
717     if (background && ! start)
718     eerrorx ("%s: --background is only relevant with --start", progname);
719    
720     if ((redirect_stdout || redirect_stderr) && ! background)
721     eerrorx ("%s: --stdout and --stderr are only relevant with --background",
722     progname);
723    
724     argc -= optind;
725     argv += optind;
726    
727     /* Validate that the binary rc_exists if we are starting */
728     if (exec && start)
729     {
730     char *tmp;
731     if (ch_root)
732 uberlord 2549 tmp = rc_strcatpaths (ch_root, exec, (char *) NULL);
733 uberlord 2547 else
734     tmp = exec;
735     if (! rc_is_file (tmp))
736     {
737     eerror ("%s: %s does not exist", progname, tmp);
738     if (ch_root)
739     free (tmp);
740     exit (EXIT_FAILURE);
741     }
742     if (ch_root)
743     free (tmp);
744     }
745    
746     if (stop)
747     {
748     int result;
749    
750     if (! schedule)
751     {
752     if (test || oknodo)
753     parse_schedule ("0", sig);
754     else
755     parse_schedule (NULL, sig);
756     }
757    
758     result = run_stop_schedule (exec, cmd, pidfile, uid, quiet, verbose, test);
759     if (test || oknodo)
760     return (result > 0 ? EXIT_SUCCESS : EXIT_FAILURE);
761     if (result < 1)
762     exit (result == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
763    
764     if (pidfile && rc_is_file (pidfile))
765     unlink (pidfile);
766    
767     if (svcname)
768     rc_set_service_daemon (svcname, exec, cmd, pidfile, false);
769    
770     exit (EXIT_SUCCESS);
771     }
772    
773     if (do_stop (exec, cmd, pidfile, uid, 0, true, false, true) > 0)
774     eerrorx ("%s: %s is already running", progname, exec);
775    
776     if (test)
777     {
778     if (quiet)
779     exit (EXIT_SUCCESS);
780    
781     einfon ("Would start %s", exec);
782     while (argc-- > 0)
783     printf("%s ", *argv++);
784     printf ("\n");
785     eindent ();
786     if (ch_uid != 0)
787     einfo ("as user %d", ch_uid);
788     if (ch_gid != 0)
789     einfo ("as group %d", ch_gid);
790     if (ch_root)
791     einfo ("in root `%s'", ch_root);
792     if (ch_dir)
793     einfo ("in dir `%s'", ch_dir);
794     if (nicelevel != 0)
795     einfo ("with a priority of %d", nicelevel);
796     eoutdent ();
797     exit (EXIT_SUCCESS);
798     }
799    
800     /* Ensure this is unset, so if the daemon does /etc/init.d/foo
801     Then we filter the environment accordingly */
802     unsetenv ("RC_SOFTLEVEL");
803    
804     if (verbose)
805     {
806     ebegin ("Detaching to start `%s'", exec);
807     eindent ();
808     }
809    
810     if (background)
811     signal (SIGCHLD, handle_signal);
812    
813     *--argv = exec;
814     if ((pid = fork ()) == -1)
815     eerrorx ("%s: fork: %s", progname, strerror (errno));
816    
817     /* Child process - lets go! */
818     if (pid == 0)
819     {
820     pid_t mypid = getpid ();
821    
822     #ifdef TIOCNOTTY
823     tty_fd = open("/dev/tty", O_RDWR);
824     #endif
825    
826     devnull_fd = open("/dev/null", O_RDWR);
827    
828     if (nicelevel)
829     {
830     if (setpriority (PRIO_PROCESS, mypid, nicelevel) == -1)
831     eerrorx ("%s: setpritory %d: %s", progname, nicelevel,
832     strerror(errno));
833     }
834    
835     if (ch_root && chroot (ch_root) < 0)
836     eerrorx ("%s: chroot `%s': %s", progname, ch_root, strerror (errno));
837    
838     if (ch_dir && chdir (ch_dir) < 0)
839     eerrorx ("%s: chdir `%s': %s", progname, ch_dir, strerror (errno));
840    
841     if (makepidfile && pidfile)
842     {
843     FILE *fp = fopen (pidfile, "w");
844     if (! fp)
845     eerrorx ("%s: fopen `%s': %s", progname, pidfile, strerror
846     (errno));
847     fprintf (fp, "%d\n", mypid);
848     fclose (fp);
849     }
850    
851     #ifdef HAVE_PAM
852     if (changeuser != NULL)
853     pamr = pam_start ("start-stop-daemon", changeuser, &conv, &pamh);
854     else
855     pamr = pam_start ("start-stop-daemon", "nobody", &conv, &pamh);
856    
857     if (pamr == PAM_SUCCESS)
858     pamr = pam_authenticate (pamh, PAM_SILENT);
859     if (pamr == PAM_SUCCESS)
860     pamr = pam_acct_mgmt (pamh, PAM_SILENT);
861     if (pamr == PAM_SUCCESS)
862     pamr = pam_open_session (pamh, PAM_SILENT);
863     if (pamr != PAM_SUCCESS)
864     eerrorx ("%s: pam error: %s", progname, pam_strerror(pamh, pamr));
865     #endif
866    
867     if ((ch_gid) && setgid(ch_gid))
868     eerrorx ("%s: unable to set groupid to %d", progname, ch_gid);
869     if (changeuser && ch_gid)
870     if (initgroups (changeuser, ch_gid))
871     eerrorx ("%s: initgroups (%s, %d)", progname, changeuser, ch_gid);
872     if (ch_uid && setuid (ch_uid))
873     eerrorx ("%s: unable to set userid to %d", progname, ch_uid);
874     else
875     {
876     struct passwd *passwd = getpwuid (ch_uid);
877     if (passwd)
878     {
879     unsetenv ("HOME");
880     if (passwd->pw_dir)
881     setenv ("HOME", passwd->pw_dir, 1);
882     unsetenv ("USER");
883     if (passwd->pw_name)
884     setenv ("USER", passwd->pw_name, 1);
885     }
886     }
887    
888     /* Close any fd's to the passwd database */
889     endpwent ();
890    
891     #ifdef TIOCNOTTY
892     ioctl(tty_fd, TIOCNOTTY, 0);
893     close(tty_fd);
894     #endif
895    
896     /* Clean the environment of any RC_ variables */
897     STRLIST_FOREACH (environ, env, i)
898     if (env && strncmp (env, "RC_", 3) != 0)
899     {
900     /* For the path character, remove the rcscript bin dir from it */
901     if (strncmp (env, "PATH=" RC_LIBDIR "bin:",
902     strlen ("PATH=" RC_LIBDIR "bin:")) == 0)
903     {
904     char *path = env;
905     char *newpath;
906     int len;
907     path += strlen ("PATH=" RC_LIBDIR "bin:");
908     len = sizeof (char *) * strlen (path) + 6;
909     newpath = rc_xmalloc (len);
910     snprintf (newpath, len, "PATH=%s", path);
911     newenv = rc_strlist_add (newenv, newpath);
912     free (newpath);
913     }
914     else
915     newenv = rc_strlist_add (newenv, env);
916     }
917    
918     umask (022);
919    
920     stdout_fd = devnull_fd;
921     stderr_fd = devnull_fd;
922     if (redirect_stdout)
923     {
924     if ((stdout_fd = open (redirect_stdout, O_WRONLY | O_CREAT | O_APPEND,
925     S_IRUSR | S_IWUSR)) == -1)
926     eerrorx ("%s: unable to open the logfile for stdout `%s': %s",
927     progname, redirect_stdout, strerror (errno));
928     }
929     if (redirect_stderr)
930     {
931     if ((stderr_fd = open (redirect_stderr, O_WRONLY | O_CREAT | O_APPEND,
932     S_IRUSR | S_IWUSR)) == -1)
933     eerrorx ("%s: unable to open the logfile for stderr `%s': %s",
934     progname, redirect_stderr, strerror (errno));
935     }
936    
937     dup2 (devnull_fd, STDIN_FILENO);
938     if (background)
939     {
940     dup2 (stdout_fd, STDOUT_FILENO);
941     dup2 (stderr_fd, STDERR_FILENO);
942     }
943    
944     for (i = getdtablesize () - 1; i >= 3; --i)
945     close(i);
946    
947     setsid ();
948    
949     execve (exec, argv, newenv);
950     #ifdef HAVE_PAM
951     if (pamr == PAM_SUCCESS)
952     pam_close_session (pamh, PAM_SILENT);
953     #endif
954     eerrorx ("%s: failed to exec `%s': %s", progname, exec, strerror (errno));
955     }
956    
957     /* Parent process */
958     if (! background)
959     {
960     /* As we're not backgrounding the process, wait for our pid to return */
961     int status = 0;
962     int savepid = pid;
963    
964     errno = 0;
965     do
966     {
967     pid = waitpid (savepid, &status, 0);
968     if (pid < 1)
969     {
970     eerror ("waitpid %d: %s", savepid, strerror (errno));
971     return (-1);
972     }
973     } while (! WIFEXITED (status) && ! WIFSIGNALED (status));
974    
975     if (! WIFEXITED (status) || WEXITSTATUS (status) != 0)
976     {
977     if (! quiet)
978     eerrorx ("%s: failed to started `%s'", progname, exec);
979     exit (EXIT_FAILURE);
980     }
981    
982     pid = savepid;
983     }
984    
985     /* Wait a little bit and check that process is still running
986     We do this as some badly written daemons fork and then barf */
987     if (START_WAIT > 0)
988     {
989     struct timeval stopat;
990     struct timeval now;
991    
992     if (gettimeofday (&stopat, NULL) != 0)
993     eerrorx ("%s: gettimeofday: %s", progname, strerror (errno));
994    
995     stopat.tv_usec += START_WAIT;
996     while (1)
997     {
998     bool alive = false;
999    
1000     tv.tv_sec = 0;
1001     tv.tv_usec = POLL_INTERVAL;
1002     if (select (0, 0, 0, 0, &tv) < 0)
1003     {
1004     /* Let our signal handler handle the interupt */
1005     if (errno != EINTR)
1006     eerrorx ("%s: select: %s", progname, strerror (errno));
1007     }
1008    
1009     if (gettimeofday (&now, NULL) != 0)
1010     eerrorx ("%s: gettimeofday: %s", progname, strerror (errno));
1011    
1012     /* This is knarly.
1013     If we backgrounded then we know the exact pid.
1014     Otherwise if we have a pidfile then it *may* know the exact pid.
1015     Failing that, we'll have to query processes.
1016     We sleep first as some programs like ntp like to fork, and write
1017     their pidfile a LONG time later. */
1018     if (background)
1019     {
1020     if (kill (pid, 0) == 0)
1021     alive = true;
1022     }
1023     else
1024     {
1025     if (pidfile && rc_exists (pidfile))
1026     {
1027     if (do_stop (NULL, NULL, pidfile, uid, 0, true, false, true) > 0)
1028     alive = true;
1029     }
1030     else
1031     {
1032     if (do_stop (exec, cmd, NULL, uid, 0, true, false, true) > 0)
1033     alive = true;
1034     }
1035     }
1036    
1037     if (! alive)
1038     eerrorx ("%s: %s died", progname, exec);
1039    
1040     if (timercmp (&now, &stopat, >))
1041     break;
1042     }
1043     }
1044    
1045     if (svcname)
1046     rc_set_service_daemon (svcname, exec, cmd, pidfile, true);
1047    
1048     exit (EXIT_SUCCESS);
1049     }

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