1 /**
2 * collectd - src/exec.c
3 * Copyright (C) 2007-2010 Florian octo Forster
4 * Copyright (C) 2007-2009 Sebastian Harl
5 * Copyright (C) 2008 Peter Holik
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; only version 2 of the License is applicable.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Florian octo Forster <octo at collectd.org>
22 * Sebastian Harl <sh at tokkee.org>
23 * Peter Holik <peter at holik.at>
24 **/
26 #define _DEFAULT_SOURCE
27 #define _BSD_SOURCE /* For setgroups */
29 #include "collectd.h"
30 #include "common.h"
31 #include "plugin.h"
33 #include "utils_cmd_putval.h"
34 #include "utils_cmd_putnotif.h"
36 #include <sys/types.h>
37 #include <pwd.h>
38 #include <grp.h>
39 #include <signal.h>
41 #include <pthread.h>
43 #define PL_NORMAL 0x01
44 #define PL_NOTIF_ACTION 0x02
46 #define PL_RUNNING 0x10
48 /*
49 * Private data types
50 */
51 /*
52 * Access to this structure is serialized using the `pl_lock' lock and the
53 * `PL_RUNNING' flag. The execution of notifications is *not* serialized, so
54 * all functions used to handle notifications MUST NOT write to this structure.
55 * The `pid' and `status' fields are thus unused if the `PL_NOTIF_ACTION' flag
56 * is set.
57 * The `PL_RUNNING' flag is set in `exec_read' and unset in `exec_read_one'.
58 */
59 struct program_list_s;
60 typedef struct program_list_s program_list_t;
61 struct program_list_s
62 {
63 char *user;
64 char *group;
65 char *exec;
66 char **argv;
67 int pid;
68 int status;
69 int flags;
70 program_list_t *next;
71 };
73 typedef struct program_list_and_notification_s
74 {
75 program_list_t *pl;
76 notification_t n;
77 } program_list_and_notification_t;
79 /*
80 * Private variables
81 */
82 static program_list_t *pl_head = NULL;
83 static pthread_mutex_t pl_lock = PTHREAD_MUTEX_INITIALIZER;
85 /*
86 * Functions
87 */
88 static void sigchld_handler (int __attribute__((unused)) signal) /* {{{ */
89 {
90 pid_t pid;
91 int status;
92 while ((pid = waitpid (-1, &status, WNOHANG)) > 0)
93 {
94 program_list_t *pl;
95 for (pl = pl_head; pl != NULL; pl = pl->next)
96 if (pl->pid == pid)
97 break;
98 if (pl != NULL)
99 pl->status = status;
100 } /* while (waitpid) */
101 } /* void sigchld_handler }}} */
103 static int exec_config_exec (oconfig_item_t *ci) /* {{{ */
104 {
105 program_list_t *pl;
106 char buffer[128];
107 int i;
109 if (ci->children_num != 0)
110 {
111 WARNING ("exec plugin: The config option `%s' may not be a block.",
112 ci->key);
113 return (-1);
114 }
115 if (ci->values_num < 2)
116 {
117 WARNING ("exec plugin: The config option `%s' needs at least two "
118 "arguments.", ci->key);
119 return (-1);
120 }
121 if ((ci->values[0].type != OCONFIG_TYPE_STRING)
122 || (ci->values[1].type != OCONFIG_TYPE_STRING))
123 {
124 WARNING ("exec plugin: The first two arguments to the `%s' option must "
125 "be string arguments.", ci->key);
126 return (-1);
127 }
129 pl = calloc (1, sizeof (*pl));
130 if (pl == NULL)
131 {
132 ERROR ("exec plugin: calloc failed.");
133 return (-1);
134 }
136 if (strcasecmp ("NotificationExec", ci->key) == 0)
137 pl->flags |= PL_NOTIF_ACTION;
138 else
139 pl->flags |= PL_NORMAL;
141 pl->user = strdup (ci->values[0].value.string);
142 if (pl->user == NULL)
143 {
144 ERROR ("exec plugin: strdup failed.");
145 sfree (pl);
146 return (-1);
147 }
149 pl->group = strchr (pl->user, ':');
150 if (pl->group != NULL)
151 {
152 *pl->group = '\0';
153 pl->group++;
154 }
156 pl->exec = strdup (ci->values[1].value.string);
157 if (pl->exec == NULL)
158 {
159 ERROR ("exec plugin: strdup failed.");
160 sfree (pl->user);
161 sfree (pl);
162 return (-1);
163 }
165 pl->argv = calloc (ci->values_num, sizeof (*pl->argv));
166 if (pl->argv == NULL)
167 {
168 ERROR ("exec plugin: calloc failed.");
169 sfree (pl->exec);
170 sfree (pl->user);
171 sfree (pl);
172 return (-1);
173 }
175 {
176 char *tmp = strrchr (ci->values[1].value.string, '/');
177 if (tmp == NULL)
178 sstrncpy (buffer, ci->values[1].value.string, sizeof (buffer));
179 else
180 sstrncpy (buffer, tmp + 1, sizeof (buffer));
181 }
182 pl->argv[0] = strdup (buffer);
183 if (pl->argv[0] == NULL)
184 {
185 ERROR ("exec plugin: strdup failed.");
186 sfree (pl->argv);
187 sfree (pl->exec);
188 sfree (pl->user);
189 sfree (pl);
190 return (-1);
191 }
193 for (i = 1; i < (ci->values_num - 1); i++)
194 {
195 if (ci->values[i + 1].type == OCONFIG_TYPE_STRING)
196 {
197 pl->argv[i] = strdup (ci->values[i + 1].value.string);
198 }
199 else
200 {
201 if (ci->values[i + 1].type == OCONFIG_TYPE_NUMBER)
202 {
203 ssnprintf (buffer, sizeof (buffer), "%lf",
204 ci->values[i + 1].value.number);
205 }
206 else
207 {
208 if (ci->values[i + 1].value.boolean)
209 sstrncpy (buffer, "true", sizeof (buffer));
210 else
211 sstrncpy (buffer, "false", sizeof (buffer));
212 }
214 pl->argv[i] = strdup (buffer);
215 }
217 if (pl->argv[i] == NULL)
218 {
219 ERROR ("exec plugin: strdup failed.");
220 break;
221 }
222 } /* for (i) */
224 if (i < (ci->values_num - 1))
225 {
226 while ((--i) >= 0)
227 {
228 sfree (pl->argv[i]);
229 }
230 sfree (pl->argv);
231 sfree (pl->exec);
232 sfree (pl->user);
233 sfree (pl);
234 return (-1);
235 }
237 for (i = 0; pl->argv[i] != NULL; i++)
238 {
239 DEBUG ("exec plugin: argv[%i] = %s", i, pl->argv[i]);
240 }
242 pl->next = pl_head;
243 pl_head = pl;
245 return (0);
246 } /* int exec_config_exec }}} */
248 static int exec_config (oconfig_item_t *ci) /* {{{ */
249 {
250 int i;
252 for (i = 0; i < ci->children_num; i++)
253 {
254 oconfig_item_t *child = ci->children + i;
255 if ((strcasecmp ("Exec", child->key) == 0)
256 || (strcasecmp ("NotificationExec", child->key) == 0))
257 exec_config_exec (child);
258 else
259 {
260 WARNING ("exec plugin: Unknown config option `%s'.", child->key);
261 }
262 } /* for (i) */
264 return (0);
265 } /* int exec_config }}} */
267 static void set_environment (void) /* {{{ */
268 {
269 char buffer[1024];
271 #ifdef HAVE_SETENV
272 ssnprintf (buffer, sizeof (buffer), "%.3f",
273 CDTIME_T_TO_DOUBLE (plugin_get_interval ()));
274 setenv ("COLLECTD_INTERVAL", buffer, /* overwrite = */ 1);
276 ssnprintf (buffer, sizeof (buffer), "%s", hostname_g);
277 setenv ("COLLECTD_HOSTNAME", buffer, /* overwrite = */ 1);
278 #else
279 ssnprintf (buffer, sizeof (buffer), "COLLECTD_INTERVAL=%.3f",
280 CDTIME_T_TO_DOUBLE (plugin_get_interval ()));
281 putenv (buffer);
283 ssnprintf (buffer, sizeof (buffer), "COLLECTD_HOSTNAME=%s", hostname_g);
284 putenv (buffer);
285 #endif
286 } /* }}} void set_environment */
288 __attribute__((noreturn))
289 static void exec_child (program_list_t *pl, int uid, int gid, int egid) /* {{{ */
290 {
291 int status;
292 char errbuf[1024];
294 #if HAVE_SETGROUPS
295 if (getuid () == 0)
296 {
297 gid_t glist[2];
298 size_t glist_len;
300 glist[0] = gid;
301 glist_len = 1;
303 if ((gid != egid) && (egid != -1))
304 {
305 glist[1] = egid;
306 glist_len = 2;
307 }
309 setgroups (glist_len, glist);
310 }
311 #endif /* HAVE_SETGROUPS */
313 status = setgid (gid);
314 if (status != 0)
315 {
316 ERROR ("exec plugin: setgid (%i) failed: %s",
317 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
318 exit (-1);
319 }
321 if (egid != -1)
322 {
323 status = setegid (egid);
324 if (status != 0)
325 {
326 ERROR ("exec plugin: setegid (%i) failed: %s",
327 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
328 exit (-1);
329 }
330 }
332 status = setuid (uid);
333 if (status != 0)
334 {
335 ERROR ("exec plugin: setuid (%i) failed: %s",
336 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
337 exit (-1);
338 }
340 execvp (pl->exec, pl->argv);
342 ERROR ("exec plugin: Failed to execute ``%s'': %s",
343 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
344 exit (-1);
345 } /* void exec_child }}} */
347 static void reset_signal_mask (void) /* {{{ */
348 {
349 sigset_t ss;
351 memset (&ss, 0, sizeof (ss));
352 sigemptyset (&ss);
353 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
354 } /* }}} void reset_signal_mask */
356 static int create_pipe (int fd_pipe[2]) /* {{{ */
357 {
358 char errbuf[1024];
359 int status;
361 status = pipe (fd_pipe);
362 if (status != 0)
363 {
364 ERROR ("exec plugin: pipe failed: %s",
365 sstrerror (errno, errbuf, sizeof (errbuf)));
366 return (-1);
367 }
369 return 0;
370 } /* }}} int create_pipe */
372 static void close_pipe (int fd_pipe[2]) /* {{{ */
373 {
374 if (fd_pipe[0] != -1)
375 close (fd_pipe[0]);
377 if (fd_pipe[1] != -1)
378 close (fd_pipe[1]);
379 } /* }}} void close_pipe */
381 /*
382 * Creates three pipes (one for reading, one for writing and one for errors),
383 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
384 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
385 * of the child. Then is calls `exec_child'.
386 */
387 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
388 {
389 int fd_pipe_in[2] = {-1, -1};
390 int fd_pipe_out[2] = {-1, -1};
391 int fd_pipe_err[2] = {-1, -1};
392 char errbuf[1024];
393 int status;
394 int pid;
396 int uid;
397 int gid;
398 int egid;
400 struct passwd *sp_ptr;
401 struct passwd sp;
402 char nambuf[2048];
404 if (pl->pid != 0)
405 return (-1);
407 if ((create_pipe(fd_pipe_in) == -1)
408 || (create_pipe(fd_pipe_out) == -1)
409 || (create_pipe(fd_pipe_err) == -1))
410 goto failed;
412 sp_ptr = NULL;
413 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
414 if (status != 0)
415 {
416 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
417 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
418 goto failed;
419 }
421 if (sp_ptr == NULL)
422 {
423 ERROR ("exec plugin: No such user: `%s'", pl->user);
424 goto failed;
425 }
427 uid = sp.pw_uid;
428 gid = sp.pw_gid;
429 if (uid == 0)
430 {
431 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
432 goto failed;
433 }
435 /* The group configured in the configfile is set as effective group, because
436 * this way the forked process can (re-)gain the user's primary group. */
437 egid = -1;
438 if (NULL != pl->group)
439 {
440 if ('\0' != *pl->group) {
441 struct group *gr_ptr = NULL;
442 struct group gr;
444 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
445 if (0 != status)
446 {
447 ERROR ("exec plugin: Failed to get group information "
448 "for group ``%s'': %s", pl->group,
449 sstrerror (errno, errbuf, sizeof (errbuf)));
450 goto failed;
451 }
452 if (NULL == gr_ptr)
453 {
454 ERROR ("exec plugin: No such group: `%s'", pl->group);
455 goto failed;
456 }
458 egid = gr.gr_gid;
459 }
460 else
461 {
462 egid = gid;
463 }
464 } /* if (pl->group == NULL) */
466 pid = fork ();
467 if (pid < 0)
468 {
469 ERROR ("exec plugin: fork failed: %s",
470 sstrerror (errno, errbuf, sizeof (errbuf)));
471 goto failed;
472 }
473 else if (pid == 0)
474 {
475 int fd_num;
476 int fd;
478 /* Close all file descriptors but the pipe end we need. */
479 fd_num = getdtablesize ();
480 for (fd = 0; fd < fd_num; fd++)
481 {
482 if ((fd == fd_pipe_in[0])
483 || (fd == fd_pipe_out[1])
484 || (fd == fd_pipe_err[1]))
485 continue;
486 close (fd);
487 }
489 /* Connect the `in' pipe to STDIN */
490 if (fd_pipe_in[0] != STDIN_FILENO)
491 {
492 dup2 (fd_pipe_in[0], STDIN_FILENO);
493 close (fd_pipe_in[0]);
494 }
496 /* Now connect the `out' pipe to STDOUT */
497 if (fd_pipe_out[1] != STDOUT_FILENO)
498 {
499 dup2 (fd_pipe_out[1], STDOUT_FILENO);
500 close (fd_pipe_out[1]);
501 }
503 /* Now connect the `err' pipe to STDERR */
504 if (fd_pipe_err[1] != STDERR_FILENO)
505 {
506 dup2 (fd_pipe_err[1], STDERR_FILENO);
507 close (fd_pipe_err[1]);
508 }
510 set_environment ();
512 /* Unblock all signals */
513 reset_signal_mask ();
515 exec_child (pl, uid, gid, egid);
516 /* does not return */
517 }
519 close (fd_pipe_in[0]);
520 close (fd_pipe_out[1]);
521 close (fd_pipe_err[1]);
523 if (fd_in != NULL)
524 *fd_in = fd_pipe_in[1];
525 else
526 close (fd_pipe_in[1]);
528 if (fd_out != NULL)
529 *fd_out = fd_pipe_out[0];
530 else
531 close (fd_pipe_out[0]);
533 if (fd_err != NULL)
534 *fd_err = fd_pipe_err[0];
535 else
536 close (fd_pipe_err[0]);
538 return (pid);
540 failed:
541 close_pipe(fd_pipe_in);
542 close_pipe(fd_pipe_out);
543 close_pipe(fd_pipe_err);
545 return (-1);
546 } /* int fork_child }}} */
548 static int parse_line (char *buffer) /* {{{ */
549 {
550 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
551 return (handle_putval (stdout, buffer));
552 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
553 return (handle_putnotif (stdout, buffer));
554 else
555 {
556 ERROR ("exec plugin: Unable to parse command, ignoring line: \"%s\"",
557 buffer);
558 return (-1);
559 }
560 } /* int parse_line }}} */
562 static void *exec_read_one (void *arg) /* {{{ */
563 {
564 program_list_t *pl = (program_list_t *) arg;
565 int fd, fd_err, highest_fd;
566 fd_set fdset, copy;
567 int status;
568 char buffer[1200]; /* if not completely read */
569 char buffer_err[1024];
570 char *pbuffer = buffer;
571 char *pbuffer_err = buffer_err;
573 status = fork_child (pl, NULL, &fd, &fd_err);
574 if (status < 0)
575 {
576 /* Reset the "running" flag */
577 pthread_mutex_lock (&pl_lock);
578 pl->flags &= ~PL_RUNNING;
579 pthread_mutex_unlock (&pl_lock);
580 pthread_exit ((void *) 1);
581 }
582 pl->pid = status;
584 assert (pl->pid != 0);
586 FD_ZERO( &fdset );
587 FD_SET(fd, &fdset);
588 FD_SET(fd_err, &fdset);
590 /* Determine the highest file descriptor */
591 highest_fd = (fd > fd_err) ? fd : fd_err;
593 /* We use a copy of fdset, as select modifies it */
594 copy = fdset;
596 while (1)
597 {
598 int len;
600 status = select (highest_fd + 1, ©, NULL, NULL, NULL);
601 if (status < 0)
602 {
603 if (errno == EINTR)
604 continue;
605 break;
606 }
608 if (FD_ISSET(fd, ©))
609 {
610 char *pnl;
612 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
614 if (len < 0)
615 {
616 if (errno == EAGAIN || errno == EINTR) continue;
617 break;
618 }
619 else if (len == 0) break; /* We've reached EOF */
621 pbuffer[len] = '\0';
623 len += pbuffer - buffer;
624 pbuffer = buffer;
626 while ((pnl = strchr(pbuffer, '\n')))
627 {
628 *pnl = '\0';
629 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
631 parse_line (pbuffer);
633 pbuffer = ++pnl;
634 }
635 /* not completely read ? */
636 if (pbuffer - buffer < len)
637 {
638 len -= pbuffer - buffer;
639 memmove(buffer, pbuffer, len);
640 pbuffer = buffer + len;
641 }
642 else
643 pbuffer = buffer;
644 }
645 else if (FD_ISSET(fd_err, ©))
646 {
647 char *pnl;
649 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
651 if (len < 0)
652 {
653 if (errno == EAGAIN || errno == EINTR)
654 continue;
655 break;
656 }
657 else if (len == 0)
658 {
659 /* We've reached EOF */
660 NOTICE ("exec plugin: Program `%s' has closed STDERR.", pl->exec);
662 /* Remove file descriptor form select() set. */
663 FD_CLR (fd_err, &fdset);
664 copy = fdset;
665 highest_fd = fd;
667 /* Clean up file descriptor */
668 close (fd_err);
669 fd_err = -1;
670 continue;
671 }
673 pbuffer_err[len] = '\0';
675 len += pbuffer_err - buffer_err;
676 pbuffer_err = buffer_err;
678 while ((pnl = strchr(pbuffer_err, '\n')))
679 {
680 *pnl = '\0';
681 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
683 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
685 pbuffer_err = ++pnl;
686 }
687 /* not completely read ? */
688 if (pbuffer_err - buffer_err < len)
689 {
690 len -= pbuffer_err - buffer_err;
691 memmove(buffer_err, pbuffer_err, len);
692 pbuffer_err = buffer_err + len;
693 }
694 else
695 pbuffer_err = buffer_err;
696 }
697 /* reset copy */
698 copy = fdset;
699 }
701 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
702 if (waitpid (pl->pid, &status, 0) > 0)
703 pl->status = status;
705 DEBUG ("exec plugin: Child %i exited with status %i.",
706 (int) pl->pid, pl->status);
708 pl->pid = 0;
710 pthread_mutex_lock (&pl_lock);
711 pl->flags &= ~PL_RUNNING;
712 pthread_mutex_unlock (&pl_lock);
714 close (fd);
715 if (fd_err >= 0)
716 close (fd_err);
718 pthread_exit ((void *) 0);
719 return (NULL);
720 } /* void *exec_read_one }}} */
722 static void *exec_notification_one (void *arg) /* {{{ */
723 {
724 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
725 notification_t *n = &((program_list_and_notification_t *) arg)->n;
726 notification_meta_t *meta;
727 int fd;
728 FILE *fh;
729 int pid;
730 int status;
731 const char *severity;
733 pid = fork_child (pl, &fd, NULL, NULL);
734 if (pid < 0) {
735 sfree (arg);
736 pthread_exit ((void *) 1);
737 }
739 fh = fdopen (fd, "w");
740 if (fh == NULL)
741 {
742 char errbuf[1024];
743 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
744 sstrerror (errno, errbuf, sizeof (errbuf)));
745 kill (pl->pid, SIGTERM);
746 pl->pid = 0;
747 close (fd);
748 sfree (arg);
749 pthread_exit ((void *) 1);
750 }
752 severity = "FAILURE";
753 if (n->severity == NOTIF_WARNING)
754 severity = "WARNING";
755 else if (n->severity == NOTIF_OKAY)
756 severity = "OKAY";
758 fprintf (fh,
759 "Severity: %s\n"
760 "Time: %.3f\n",
761 severity, CDTIME_T_TO_DOUBLE (n->time));
763 /* Print the optional fields */
764 if (strlen (n->host) > 0)
765 fprintf (fh, "Host: %s\n", n->host);
766 if (strlen (n->plugin) > 0)
767 fprintf (fh, "Plugin: %s\n", n->plugin);
768 if (strlen (n->plugin_instance) > 0)
769 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
770 if (strlen (n->type) > 0)
771 fprintf (fh, "Type: %s\n", n->type);
772 if (strlen (n->type_instance) > 0)
773 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
775 for (meta = n->meta; meta != NULL; meta = meta->next)
776 {
777 if (meta->type == NM_TYPE_STRING)
778 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
779 else if (meta->type == NM_TYPE_SIGNED_INT)
780 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
781 else if (meta->type == NM_TYPE_UNSIGNED_INT)
782 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
783 else if (meta->type == NM_TYPE_DOUBLE)
784 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
785 else if (meta->type == NM_TYPE_BOOLEAN)
786 fprintf (fh, "%s: %s\n", meta->name,
787 meta->nm_value.nm_boolean ? "true" : "false");
788 }
790 fprintf (fh, "\n%s\n", n->message);
792 fflush (fh);
793 fclose (fh);
795 waitpid (pid, &status, 0);
797 DEBUG ("exec plugin: Child %i exited with status %i.",
798 pid, status);
800 if (n->meta != NULL)
801 plugin_notification_meta_free (n->meta);
802 n->meta = NULL;
803 sfree (arg);
804 pthread_exit ((void *) 0);
805 return (NULL);
806 } /* void *exec_notification_one }}} */
808 static int exec_init (void) /* {{{ */
809 {
810 struct sigaction sa;
812 memset (&sa, '\0', sizeof (sa));
813 sa.sa_handler = sigchld_handler;
814 sigaction (SIGCHLD, &sa, NULL);
816 return (0);
817 } /* int exec_init }}} */
819 static int exec_read (void) /* {{{ */
820 {
821 program_list_t *pl;
823 for (pl = pl_head; pl != NULL; pl = pl->next)
824 {
825 pthread_t t;
826 pthread_attr_t attr;
828 /* Only execute `normal' style executables here. */
829 if ((pl->flags & PL_NORMAL) == 0)
830 continue;
832 pthread_mutex_lock (&pl_lock);
833 /* Skip if a child is already running. */
834 if ((pl->flags & PL_RUNNING) != 0)
835 {
836 pthread_mutex_unlock (&pl_lock);
837 continue;
838 }
839 pl->flags |= PL_RUNNING;
840 pthread_mutex_unlock (&pl_lock);
842 pthread_attr_init (&attr);
843 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
844 plugin_thread_create (&t, &attr, exec_read_one, (void *) pl);
845 pthread_attr_destroy (&attr);
846 } /* for (pl) */
848 return (0);
849 } /* int exec_read }}} */
851 static int exec_notification (const notification_t *n, /* {{{ */
852 user_data_t __attribute__((unused)) *user_data)
853 {
854 program_list_t *pl;
855 program_list_and_notification_t *pln;
857 for (pl = pl_head; pl != NULL; pl = pl->next)
858 {
859 pthread_t t;
860 pthread_attr_t attr;
862 /* Only execute `notification' style executables here. */
863 if ((pl->flags & PL_NOTIF_ACTION) == 0)
864 continue;
866 /* Skip if a child is already running. */
867 if (pl->pid != 0)
868 continue;
870 pln = malloc (sizeof (*pln));
871 if (pln == NULL)
872 {
873 ERROR ("exec plugin: malloc failed.");
874 continue;
875 }
877 pln->pl = pl;
878 memcpy (&pln->n, n, sizeof (notification_t));
880 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
881 * will run into an endless loop. */
882 pln->n.meta = NULL;
883 plugin_notification_meta_copy (&pln->n, n);
885 pthread_attr_init (&attr);
886 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
887 plugin_thread_create (&t, &attr, exec_notification_one, (void *) pln);
888 pthread_attr_destroy (&attr);
889 } /* for (pl) */
891 return (0);
892 } /* }}} int exec_notification */
894 static int exec_shutdown (void) /* {{{ */
895 {
896 program_list_t *pl;
897 program_list_t *next;
899 pl = pl_head;
900 while (pl != NULL)
901 {
902 next = pl->next;
904 if (pl->pid > 0)
905 {
906 kill (pl->pid, SIGTERM);
907 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
908 }
910 sfree (pl->user);
911 sfree (pl);
913 pl = next;
914 } /* while (pl) */
915 pl_head = NULL;
917 return (0);
918 } /* int exec_shutdown }}} */
920 void module_register (void)
921 {
922 plugin_register_complex_config ("exec", exec_config);
923 plugin_register_init ("exec", exec_init);
924 plugin_register_read ("exec", exec_read);
925 plugin_register_notification ("exec", exec_notification,
926 /* user_data = */ NULL);
927 plugin_register_shutdown ("exec", exec_shutdown);
928 } /* void module_register */
930 /*
931 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
932 */