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"
31 #include "common.h"
32 #include "plugin.h"
34 #include "utils_cmd_putval.h"
35 #include "utils_cmd_putnotif.h"
37 #include <sys/types.h>
38 #include <pwd.h>
39 #include <grp.h>
40 #include <signal.h>
42 #define PL_NORMAL 0x01
43 #define PL_NOTIF_ACTION 0x02
45 #define PL_RUNNING 0x10
47 /*
48 * Private data types
49 */
50 /*
51 * Access to this structure is serialized using the `pl_lock' lock and the
52 * `PL_RUNNING' flag. The execution of notifications is *not* serialized, so
53 * all functions used to handle notifications MUST NOT write to this structure.
54 * The `pid' and `status' fields are thus unused if the `PL_NOTIF_ACTION' flag
55 * is set.
56 * The `PL_RUNNING' flag is set in `exec_read' and unset in `exec_read_one'.
57 */
58 struct program_list_s;
59 typedef struct program_list_s program_list_t;
60 struct program_list_s
61 {
62 char *user;
63 char *group;
64 char *exec;
65 char **argv;
66 int pid;
67 int status;
68 int flags;
69 program_list_t *next;
70 };
72 typedef struct program_list_and_notification_s
73 {
74 program_list_t *pl;
75 notification_t n;
76 } program_list_and_notification_t;
78 /*
79 * Private variables
80 */
81 static program_list_t *pl_head = NULL;
82 static pthread_mutex_t pl_lock = PTHREAD_MUTEX_INITIALIZER;
84 /*
85 * Functions
86 */
87 static void sigchld_handler (int __attribute__((unused)) signal) /* {{{ */
88 {
89 pid_t pid;
90 int status;
91 while ((pid = waitpid (-1, &status, WNOHANG)) > 0)
92 {
93 program_list_t *pl;
94 for (pl = pl_head; pl != NULL; pl = pl->next)
95 if (pl->pid == pid)
96 break;
97 if (pl != NULL)
98 pl->status = status;
99 } /* while (waitpid) */
100 } /* void sigchld_handler }}} */
102 static int exec_config_exec (oconfig_item_t *ci) /* {{{ */
103 {
104 program_list_t *pl;
105 char buffer[128];
106 int i;
108 if (ci->children_num != 0)
109 {
110 WARNING ("exec plugin: The config option `%s' may not be a block.",
111 ci->key);
112 return (-1);
113 }
114 if (ci->values_num < 2)
115 {
116 WARNING ("exec plugin: The config option `%s' needs at least two "
117 "arguments.", ci->key);
118 return (-1);
119 }
120 if ((ci->values[0].type != OCONFIG_TYPE_STRING)
121 || (ci->values[1].type != OCONFIG_TYPE_STRING))
122 {
123 WARNING ("exec plugin: The first two arguments to the `%s' option must "
124 "be string arguments.", ci->key);
125 return (-1);
126 }
128 pl = calloc (1, sizeof (*pl));
129 if (pl == NULL)
130 {
131 ERROR ("exec plugin: calloc failed.");
132 return (-1);
133 }
135 if (strcasecmp ("NotificationExec", ci->key) == 0)
136 pl->flags |= PL_NOTIF_ACTION;
137 else
138 pl->flags |= PL_NORMAL;
140 pl->user = strdup (ci->values[0].value.string);
141 if (pl->user == NULL)
142 {
143 ERROR ("exec plugin: strdup failed.");
144 sfree (pl);
145 return (-1);
146 }
148 pl->group = strchr (pl->user, ':');
149 if (pl->group != NULL)
150 {
151 *pl->group = '\0';
152 pl->group++;
153 }
155 pl->exec = strdup (ci->values[1].value.string);
156 if (pl->exec == NULL)
157 {
158 ERROR ("exec plugin: strdup failed.");
159 sfree (pl->user);
160 sfree (pl);
161 return (-1);
162 }
164 pl->argv = calloc (ci->values_num, sizeof (*pl->argv));
165 if (pl->argv == NULL)
166 {
167 ERROR ("exec plugin: calloc failed.");
168 sfree (pl->exec);
169 sfree (pl->user);
170 sfree (pl);
171 return (-1);
172 }
174 {
175 char *tmp = strrchr (ci->values[1].value.string, '/');
176 if (tmp == NULL)
177 sstrncpy (buffer, ci->values[1].value.string, sizeof (buffer));
178 else
179 sstrncpy (buffer, tmp + 1, sizeof (buffer));
180 }
181 pl->argv[0] = strdup (buffer);
182 if (pl->argv[0] == NULL)
183 {
184 ERROR ("exec plugin: strdup failed.");
185 sfree (pl->argv);
186 sfree (pl->exec);
187 sfree (pl->user);
188 sfree (pl);
189 return (-1);
190 }
192 for (i = 1; i < (ci->values_num - 1); i++)
193 {
194 if (ci->values[i + 1].type == OCONFIG_TYPE_STRING)
195 {
196 pl->argv[i] = strdup (ci->values[i + 1].value.string);
197 }
198 else
199 {
200 if (ci->values[i + 1].type == OCONFIG_TYPE_NUMBER)
201 {
202 ssnprintf (buffer, sizeof (buffer), "%lf",
203 ci->values[i + 1].value.number);
204 }
205 else
206 {
207 if (ci->values[i + 1].value.boolean)
208 sstrncpy (buffer, "true", sizeof (buffer));
209 else
210 sstrncpy (buffer, "false", sizeof (buffer));
211 }
213 pl->argv[i] = strdup (buffer);
214 }
216 if (pl->argv[i] == NULL)
217 {
218 ERROR ("exec plugin: strdup failed.");
219 break;
220 }
221 } /* for (i) */
223 if (i < (ci->values_num - 1))
224 {
225 while ((--i) >= 0)
226 {
227 sfree (pl->argv[i]);
228 }
229 sfree (pl->argv);
230 sfree (pl->exec);
231 sfree (pl->user);
232 sfree (pl);
233 return (-1);
234 }
236 for (i = 0; pl->argv[i] != NULL; i++)
237 {
238 DEBUG ("exec plugin: argv[%i] = %s", i, pl->argv[i]);
239 }
241 pl->next = pl_head;
242 pl_head = pl;
244 return (0);
245 } /* int exec_config_exec }}} */
247 static int exec_config (oconfig_item_t *ci) /* {{{ */
248 {
249 int i;
251 for (i = 0; i < ci->children_num; i++)
252 {
253 oconfig_item_t *child = ci->children + i;
254 if ((strcasecmp ("Exec", child->key) == 0)
255 || (strcasecmp ("NotificationExec", child->key) == 0))
256 exec_config_exec (child);
257 else
258 {
259 WARNING ("exec plugin: Unknown config option `%s'.", child->key);
260 }
261 } /* for (i) */
263 return (0);
264 } /* int exec_config }}} */
266 static void set_environment (void) /* {{{ */
267 {
268 char buffer[1024];
270 #ifdef HAVE_SETENV
271 ssnprintf (buffer, sizeof (buffer), "%.3f",
272 CDTIME_T_TO_DOUBLE (plugin_get_interval ()));
273 setenv ("COLLECTD_INTERVAL", buffer, /* overwrite = */ 1);
275 ssnprintf (buffer, sizeof (buffer), "%s", hostname_g);
276 setenv ("COLLECTD_HOSTNAME", buffer, /* overwrite = */ 1);
277 #else
278 ssnprintf (buffer, sizeof (buffer), "COLLECTD_INTERVAL=%.3f",
279 CDTIME_T_TO_DOUBLE (plugin_get_interval ()));
280 putenv (buffer);
282 ssnprintf (buffer, sizeof (buffer), "COLLECTD_HOSTNAME=%s", hostname_g);
283 putenv (buffer);
284 #endif
285 } /* }}} void set_environment */
287 __attribute__((noreturn))
288 static void exec_child (program_list_t *pl, int uid, int gid, int egid) /* {{{ */
289 {
290 int status;
291 char errbuf[1024];
293 #if HAVE_SETGROUPS
294 if (getuid () == 0)
295 {
296 gid_t glist[2];
297 size_t glist_len;
299 glist[0] = gid;
300 glist_len = 1;
302 if ((gid != egid) && (egid != -1))
303 {
304 glist[1] = egid;
305 glist_len = 2;
306 }
308 setgroups (glist_len, glist);
309 }
310 #endif /* HAVE_SETGROUPS */
312 status = setgid (gid);
313 if (status != 0)
314 {
315 ERROR ("exec plugin: setgid (%i) failed: %s",
316 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
317 exit (-1);
318 }
320 if (egid != -1)
321 {
322 status = setegid (egid);
323 if (status != 0)
324 {
325 ERROR ("exec plugin: setegid (%i) failed: %s",
326 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
327 exit (-1);
328 }
329 }
331 status = setuid (uid);
332 if (status != 0)
333 {
334 ERROR ("exec plugin: setuid (%i) failed: %s",
335 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
336 exit (-1);
337 }
339 execvp (pl->exec, pl->argv);
341 ERROR ("exec plugin: Failed to execute ``%s'': %s",
342 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
343 exit (-1);
344 } /* void exec_child }}} */
346 static void reset_signal_mask (void) /* {{{ */
347 {
348 sigset_t ss;
350 sigemptyset (&ss);
351 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
352 } /* }}} void reset_signal_mask */
354 static int create_pipe (int fd_pipe[2]) /* {{{ */
355 {
356 char errbuf[1024];
357 int status;
359 status = pipe (fd_pipe);
360 if (status != 0)
361 {
362 ERROR ("exec plugin: pipe failed: %s",
363 sstrerror (errno, errbuf, sizeof (errbuf)));
364 return (-1);
365 }
367 return 0;
368 } /* }}} int create_pipe */
370 static void close_pipe (int fd_pipe[2]) /* {{{ */
371 {
372 if (fd_pipe[0] != -1)
373 close (fd_pipe[0]);
375 if (fd_pipe[1] != -1)
376 close (fd_pipe[1]);
377 } /* }}} void close_pipe */
379 /*
380 * Creates three pipes (one for reading, one for writing and one for errors),
381 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
382 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
383 * of the child. Then is calls `exec_child'.
384 */
385 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
386 {
387 int fd_pipe_in[2] = {-1, -1};
388 int fd_pipe_out[2] = {-1, -1};
389 int fd_pipe_err[2] = {-1, -1};
390 char errbuf[1024];
391 int status;
392 int pid;
394 int uid;
395 int gid;
396 int egid;
398 struct passwd *sp_ptr;
399 struct passwd sp;
400 char nambuf[2048];
402 if (pl->pid != 0)
403 return (-1);
405 if ((create_pipe(fd_pipe_in) == -1)
406 || (create_pipe(fd_pipe_out) == -1)
407 || (create_pipe(fd_pipe_err) == -1))
408 goto failed;
410 sp_ptr = NULL;
411 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
412 if (status != 0)
413 {
414 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
415 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
416 goto failed;
417 }
419 if (sp_ptr == NULL)
420 {
421 ERROR ("exec plugin: No such user: `%s'", pl->user);
422 goto failed;
423 }
425 uid = sp.pw_uid;
426 gid = sp.pw_gid;
427 if (uid == 0)
428 {
429 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
430 goto failed;
431 }
433 /* The group configured in the configfile is set as effective group, because
434 * this way the forked process can (re-)gain the user's primary group. */
435 egid = -1;
436 if (NULL != pl->group)
437 {
438 if ('\0' != *pl->group) {
439 struct group *gr_ptr = NULL;
440 struct group gr;
442 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
443 if (0 != status)
444 {
445 ERROR ("exec plugin: Failed to get group information "
446 "for group ``%s'': %s", pl->group,
447 sstrerror (errno, errbuf, sizeof (errbuf)));
448 goto failed;
449 }
450 if (NULL == gr_ptr)
451 {
452 ERROR ("exec plugin: No such group: `%s'", pl->group);
453 goto failed;
454 }
456 egid = gr.gr_gid;
457 }
458 else
459 {
460 egid = gid;
461 }
462 } /* if (pl->group == NULL) */
464 pid = fork ();
465 if (pid < 0)
466 {
467 ERROR ("exec plugin: fork failed: %s",
468 sstrerror (errno, errbuf, sizeof (errbuf)));
469 goto failed;
470 }
471 else if (pid == 0)
472 {
473 int fd_num;
474 int fd;
476 /* Close all file descriptors but the pipe end we need. */
477 fd_num = getdtablesize ();
478 for (fd = 0; fd < fd_num; fd++)
479 {
480 if ((fd == fd_pipe_in[0])
481 || (fd == fd_pipe_out[1])
482 || (fd == fd_pipe_err[1]))
483 continue;
484 close (fd);
485 }
487 /* Connect the `in' pipe to STDIN */
488 if (fd_pipe_in[0] != STDIN_FILENO)
489 {
490 dup2 (fd_pipe_in[0], STDIN_FILENO);
491 close (fd_pipe_in[0]);
492 }
494 /* Now connect the `out' pipe to STDOUT */
495 if (fd_pipe_out[1] != STDOUT_FILENO)
496 {
497 dup2 (fd_pipe_out[1], STDOUT_FILENO);
498 close (fd_pipe_out[1]);
499 }
501 /* Now connect the `err' pipe to STDERR */
502 if (fd_pipe_err[1] != STDERR_FILENO)
503 {
504 dup2 (fd_pipe_err[1], STDERR_FILENO);
505 close (fd_pipe_err[1]);
506 }
508 set_environment ();
510 /* Unblock all signals */
511 reset_signal_mask ();
513 exec_child (pl, uid, gid, egid);
514 /* does not return */
515 }
517 close (fd_pipe_in[0]);
518 close (fd_pipe_out[1]);
519 close (fd_pipe_err[1]);
521 if (fd_in != NULL)
522 *fd_in = fd_pipe_in[1];
523 else
524 close (fd_pipe_in[1]);
526 if (fd_out != NULL)
527 *fd_out = fd_pipe_out[0];
528 else
529 close (fd_pipe_out[0]);
531 if (fd_err != NULL)
532 *fd_err = fd_pipe_err[0];
533 else
534 close (fd_pipe_err[0]);
536 return (pid);
538 failed:
539 close_pipe(fd_pipe_in);
540 close_pipe(fd_pipe_out);
541 close_pipe(fd_pipe_err);
543 return (-1);
544 } /* int fork_child }}} */
546 static int parse_line (char *buffer) /* {{{ */
547 {
548 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
549 return (handle_putval (stdout, buffer));
550 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
551 return (handle_putnotif (stdout, buffer));
552 else
553 {
554 ERROR ("exec plugin: Unable to parse command, ignoring line: \"%s\"",
555 buffer);
556 return (-1);
557 }
558 } /* int parse_line }}} */
560 static void *exec_read_one (void *arg) /* {{{ */
561 {
562 program_list_t *pl = (program_list_t *) arg;
563 int fd, fd_err, highest_fd;
564 fd_set fdset, copy;
565 int status;
566 char buffer[1200]; /* if not completely read */
567 char buffer_err[1024];
568 char *pbuffer = buffer;
569 char *pbuffer_err = buffer_err;
571 status = fork_child (pl, NULL, &fd, &fd_err);
572 if (status < 0)
573 {
574 /* Reset the "running" flag */
575 pthread_mutex_lock (&pl_lock);
576 pl->flags &= ~PL_RUNNING;
577 pthread_mutex_unlock (&pl_lock);
578 pthread_exit ((void *) 1);
579 }
580 pl->pid = status;
582 assert (pl->pid != 0);
584 FD_ZERO( &fdset );
585 FD_SET(fd, &fdset);
586 FD_SET(fd_err, &fdset);
588 /* Determine the highest file descriptor */
589 highest_fd = (fd > fd_err) ? fd : fd_err;
591 /* We use a copy of fdset, as select modifies it */
592 copy = fdset;
594 while (1)
595 {
596 int len;
598 status = select (highest_fd + 1, ©, NULL, NULL, NULL);
599 if (status < 0)
600 {
601 if (errno == EINTR)
602 continue;
603 break;
604 }
606 if (FD_ISSET(fd, ©))
607 {
608 char *pnl;
610 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
612 if (len < 0)
613 {
614 if (errno == EAGAIN || errno == EINTR) continue;
615 break;
616 }
617 else if (len == 0) break; /* We've reached EOF */
619 pbuffer[len] = '\0';
621 len += pbuffer - buffer;
622 pbuffer = buffer;
624 while ((pnl = strchr(pbuffer, '\n')))
625 {
626 *pnl = '\0';
627 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
629 parse_line (pbuffer);
631 pbuffer = ++pnl;
632 }
633 /* not completely read ? */
634 if (pbuffer - buffer < len)
635 {
636 len -= pbuffer - buffer;
637 memmove(buffer, pbuffer, len);
638 pbuffer = buffer + len;
639 }
640 else
641 pbuffer = buffer;
642 }
643 else if (FD_ISSET(fd_err, ©))
644 {
645 char *pnl;
647 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
649 if (len < 0)
650 {
651 if (errno == EAGAIN || errno == EINTR)
652 continue;
653 break;
654 }
655 else if (len == 0)
656 {
657 /* We've reached EOF */
658 NOTICE ("exec plugin: Program `%s' has closed STDERR.", pl->exec);
660 /* Remove file descriptor form select() set. */
661 FD_CLR (fd_err, &fdset);
662 copy = fdset;
663 highest_fd = fd;
665 /* Clean up file descriptor */
666 close (fd_err);
667 fd_err = -1;
668 continue;
669 }
671 pbuffer_err[len] = '\0';
673 len += pbuffer_err - buffer_err;
674 pbuffer_err = buffer_err;
676 while ((pnl = strchr(pbuffer_err, '\n')))
677 {
678 *pnl = '\0';
679 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
681 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
683 pbuffer_err = ++pnl;
684 }
685 /* not completely read ? */
686 if (pbuffer_err - buffer_err < len)
687 {
688 len -= pbuffer_err - buffer_err;
689 memmove(buffer_err, pbuffer_err, len);
690 pbuffer_err = buffer_err + len;
691 }
692 else
693 pbuffer_err = buffer_err;
694 }
695 /* reset copy */
696 copy = fdset;
697 }
699 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
700 if (waitpid (pl->pid, &status, 0) > 0)
701 pl->status = status;
703 DEBUG ("exec plugin: Child %i exited with status %i.",
704 (int) pl->pid, pl->status);
706 pl->pid = 0;
708 pthread_mutex_lock (&pl_lock);
709 pl->flags &= ~PL_RUNNING;
710 pthread_mutex_unlock (&pl_lock);
712 close (fd);
713 if (fd_err >= 0)
714 close (fd_err);
716 pthread_exit ((void *) 0);
717 return (NULL);
718 } /* void *exec_read_one }}} */
720 static void *exec_notification_one (void *arg) /* {{{ */
721 {
722 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
723 notification_t *n = &((program_list_and_notification_t *) arg)->n;
724 notification_meta_t *meta;
725 int fd;
726 FILE *fh;
727 int pid;
728 int status;
729 const char *severity;
731 pid = fork_child (pl, &fd, NULL, NULL);
732 if (pid < 0) {
733 sfree (arg);
734 pthread_exit ((void *) 1);
735 }
737 fh = fdopen (fd, "w");
738 if (fh == NULL)
739 {
740 char errbuf[1024];
741 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
742 sstrerror (errno, errbuf, sizeof (errbuf)));
743 kill (pid, SIGTERM);
744 close (fd);
745 sfree (arg);
746 pthread_exit ((void *) 1);
747 }
749 severity = "FAILURE";
750 if (n->severity == NOTIF_WARNING)
751 severity = "WARNING";
752 else if (n->severity == NOTIF_OKAY)
753 severity = "OKAY";
755 fprintf (fh,
756 "Severity: %s\n"
757 "Time: %.3f\n",
758 severity, CDTIME_T_TO_DOUBLE (n->time));
760 /* Print the optional fields */
761 if (strlen (n->host) > 0)
762 fprintf (fh, "Host: %s\n", n->host);
763 if (strlen (n->plugin) > 0)
764 fprintf (fh, "Plugin: %s\n", n->plugin);
765 if (strlen (n->plugin_instance) > 0)
766 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
767 if (strlen (n->type) > 0)
768 fprintf (fh, "Type: %s\n", n->type);
769 if (strlen (n->type_instance) > 0)
770 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
772 for (meta = n->meta; meta != NULL; meta = meta->next)
773 {
774 if (meta->type == NM_TYPE_STRING)
775 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
776 else if (meta->type == NM_TYPE_SIGNED_INT)
777 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
778 else if (meta->type == NM_TYPE_UNSIGNED_INT)
779 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
780 else if (meta->type == NM_TYPE_DOUBLE)
781 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
782 else if (meta->type == NM_TYPE_BOOLEAN)
783 fprintf (fh, "%s: %s\n", meta->name,
784 meta->nm_value.nm_boolean ? "true" : "false");
785 }
787 fprintf (fh, "\n%s\n", n->message);
789 fflush (fh);
790 fclose (fh);
792 waitpid (pid, &status, 0);
794 DEBUG ("exec plugin: Child %i exited with status %i.",
795 pid, status);
797 if (n->meta != NULL)
798 plugin_notification_meta_free (n->meta);
799 n->meta = NULL;
800 sfree (arg);
801 pthread_exit ((void *) 0);
802 return (NULL);
803 } /* void *exec_notification_one }}} */
805 static int exec_init (void) /* {{{ */
806 {
807 struct sigaction sa = {
808 .sa_handler = sigchld_handler
809 };
811 sigaction (SIGCHLD, &sa, NULL);
813 return (0);
814 } /* int exec_init }}} */
816 static int exec_read (void) /* {{{ */
817 {
818 program_list_t *pl;
820 for (pl = pl_head; pl != NULL; pl = pl->next)
821 {
822 pthread_t t;
823 pthread_attr_t attr;
825 /* Only execute `normal' style executables here. */
826 if ((pl->flags & PL_NORMAL) == 0)
827 continue;
829 pthread_mutex_lock (&pl_lock);
830 /* Skip if a child is already running. */
831 if ((pl->flags & PL_RUNNING) != 0)
832 {
833 pthread_mutex_unlock (&pl_lock);
834 continue;
835 }
836 pl->flags |= PL_RUNNING;
837 pthread_mutex_unlock (&pl_lock);
839 pthread_attr_init (&attr);
840 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
841 plugin_thread_create (&t, &attr, exec_read_one, (void *) pl);
842 pthread_attr_destroy (&attr);
843 } /* for (pl) */
845 return (0);
846 } /* int exec_read }}} */
848 static int exec_notification (const notification_t *n, /* {{{ */
849 user_data_t __attribute__((unused)) *user_data)
850 {
851 program_list_t *pl;
852 program_list_and_notification_t *pln;
854 for (pl = pl_head; pl != NULL; pl = pl->next)
855 {
856 pthread_t t;
857 pthread_attr_t attr;
859 /* Only execute `notification' style executables here. */
860 if ((pl->flags & PL_NOTIF_ACTION) == 0)
861 continue;
863 /* Skip if a child is already running. */
864 if (pl->pid != 0)
865 continue;
867 pln = malloc (sizeof (*pln));
868 if (pln == NULL)
869 {
870 ERROR ("exec plugin: malloc failed.");
871 continue;
872 }
874 pln->pl = pl;
875 memcpy (&pln->n, n, sizeof (notification_t));
877 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
878 * will run into an endless loop. */
879 pln->n.meta = NULL;
880 plugin_notification_meta_copy (&pln->n, n);
882 pthread_attr_init (&attr);
883 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
884 plugin_thread_create (&t, &attr, exec_notification_one, (void *) pln);
885 pthread_attr_destroy (&attr);
886 } /* for (pl) */
888 return (0);
889 } /* }}} int exec_notification */
891 static int exec_shutdown (void) /* {{{ */
892 {
893 program_list_t *pl;
894 program_list_t *next;
896 pl = pl_head;
897 while (pl != NULL)
898 {
899 next = pl->next;
901 if (pl->pid > 0)
902 {
903 kill (pl->pid, SIGTERM);
904 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
905 }
907 sfree (pl->user);
908 sfree (pl);
910 pl = next;
911 } /* while (pl) */
912 pl_head = NULL;
914 return (0);
915 } /* int exec_shutdown }}} */
917 void module_register (void)
918 {
919 plugin_register_complex_config ("exec", exec_config);
920 plugin_register_init ("exec", exec_init);
921 plugin_register_read ("exec", exec_read);
922 plugin_register_notification ("exec", exec_notification,
923 /* user_data = */ NULL);
924 plugin_register_shutdown ("exec", exec_shutdown);
925 } /* void module_register */
927 /*
928 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
929 */