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 verplant.org>
22 * Sebastian Harl <sh at tokkee.org>
23 * Peter Holik <peter at holik.at>
24 **/
26 #define _BSD_SOURCE /* For setgroups */
28 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
32 #include "utils_cmd_putval.h"
33 #include "utils_cmd_putnotif.h"
35 #include <sys/types.h>
36 #include <pwd.h>
37 #include <grp.h>
38 #include <signal.h>
40 #include <pthread.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 = (program_list_t *) malloc (sizeof (program_list_t));
129 if (pl == NULL)
130 {
131 ERROR ("exec plugin: malloc failed.");
132 return (-1);
133 }
134 memset (pl, '\0', sizeof (program_list_t));
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 = (char **) malloc (ci->values_num * sizeof (char *));
166 if (pl->argv == NULL)
167 {
168 ERROR ("exec plugin: malloc failed.");
169 sfree (pl->exec);
170 sfree (pl->user);
171 sfree (pl);
172 return (-1);
173 }
174 memset (pl->argv, '\0', ci->values_num * sizeof (char *));
176 {
177 char *tmp = strrchr (ci->values[1].value.string, '/');
178 if (tmp == NULL)
179 sstrncpy (buffer, ci->values[1].value.string, sizeof (buffer));
180 else
181 sstrncpy (buffer, tmp + 1, sizeof (buffer));
182 }
183 pl->argv[0] = strdup (buffer);
184 if (pl->argv[0] == NULL)
185 {
186 ERROR ("exec plugin: malloc failed.");
187 sfree (pl->argv);
188 sfree (pl->exec);
189 sfree (pl->user);
190 sfree (pl);
191 return (-1);
192 }
194 for (i = 1; i < (ci->values_num - 1); i++)
195 {
196 if (ci->values[i + 1].type == OCONFIG_TYPE_STRING)
197 {
198 pl->argv[i] = strdup (ci->values[i + 1].value.string);
199 }
200 else
201 {
202 if (ci->values[i + 1].type == OCONFIG_TYPE_NUMBER)
203 {
204 ssnprintf (buffer, sizeof (buffer), "%lf",
205 ci->values[i + 1].value.number);
206 }
207 else
208 {
209 if (ci->values[i + 1].value.boolean)
210 sstrncpy (buffer, "true", sizeof (buffer));
211 else
212 sstrncpy (buffer, "false", sizeof (buffer));
213 }
215 pl->argv[i] = strdup (buffer);
216 }
218 if (pl->argv[i] == NULL)
219 {
220 ERROR ("exec plugin: strdup failed.");
221 break;
222 }
223 } /* for (i) */
225 if (i < (ci->values_num - 1))
226 {
227 while ((--i) >= 0)
228 {
229 sfree (pl->argv[i]);
230 }
231 sfree (pl->argv);
232 sfree (pl->exec);
233 sfree (pl->user);
234 sfree (pl);
235 return (-1);
236 }
238 for (i = 0; pl->argv[i] != NULL; i++)
239 {
240 DEBUG ("exec plugin: argv[%i] = %s", i, pl->argv[i]);
241 }
243 pl->next = pl_head;
244 pl_head = pl;
246 return (0);
247 } /* int exec_config_exec }}} */
249 static int exec_config (oconfig_item_t *ci) /* {{{ */
250 {
251 int i;
253 for (i = 0; i < ci->children_num; i++)
254 {
255 oconfig_item_t *child = ci->children + i;
256 if ((strcasecmp ("Exec", child->key) == 0)
257 || (strcasecmp ("NotificationExec", child->key) == 0))
258 exec_config_exec (child);
259 else
260 {
261 WARNING ("exec plugin: Unknown config option `%s'.", child->key);
262 }
263 } /* for (i) */
265 return (0);
266 } /* int exec_config }}} */
268 static void set_environment (void) /* {{{ */
269 {
270 char buffer[1024];
272 #ifdef HAVE_SETENV
273 ssnprintf (buffer, sizeof (buffer), "%.3f",
274 CDTIME_T_TO_DOUBLE (plugin_get_interval ()));
275 setenv ("COLLECTD_INTERVAL", buffer, /* overwrite = */ 1);
277 ssnprintf (buffer, sizeof (buffer), "%s", hostname_g);
278 setenv ("COLLECTD_HOSTNAME", buffer, /* overwrite = */ 1);
279 #else
280 ssnprintf (buffer, sizeof (buffer), "COLLECTD_INTERVAL=%.3f",
281 CDTIME_T_TO_DOUBLE (plugin_get_interval ()));
282 putenv (buffer);
284 ssnprintf (buffer, sizeof (buffer), "COLLECTD_HOSTNAME=%s", hostname_g);
285 putenv (buffer);
286 #endif
287 } /* }}} void set_environment */
289 __attribute__((noreturn))
290 static void exec_child (program_list_t *pl) /* {{{ */
291 {
292 int status;
293 int uid;
294 int gid;
295 int egid;
297 struct passwd *sp_ptr;
298 struct passwd sp;
299 char nambuf[2048];
300 char errbuf[1024];
302 sp_ptr = NULL;
303 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
304 if (status != 0)
305 {
306 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
307 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
308 exit (-1);
309 }
310 if (sp_ptr == NULL)
311 {
312 ERROR ("exec plugin: No such user: `%s'", pl->user);
313 exit (-1);
314 }
316 uid = sp.pw_uid;
317 gid = sp.pw_gid;
318 if (uid == 0)
319 {
320 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
321 exit (-1);
322 }
324 /* The group configured in the configfile is set as effective group, because
325 * this way the forked process can (re-)gain the user's primary group. */
326 egid = -1;
327 if (NULL != pl->group)
328 {
329 if ('\0' != *pl->group) {
330 struct group *gr_ptr = NULL;
331 struct group gr;
333 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
334 if (0 != status)
335 {
336 ERROR ("exec plugin: Failed to get group information "
337 "for group ``%s'': %s", pl->group,
338 sstrerror (errno, errbuf, sizeof (errbuf)));
339 exit (-1);
340 }
341 if (NULL == gr_ptr)
342 {
343 ERROR ("exec plugin: No such group: `%s'", pl->group);
344 exit (-1);
345 }
347 egid = gr.gr_gid;
348 }
349 else
350 {
351 egid = gid;
352 }
353 } /* if (pl->group == NULL) */
355 #if HAVE_SETGROUPS
356 if (getuid () == 0)
357 {
358 gid_t glist[2];
359 size_t glist_len;
361 glist[0] = gid;
362 glist_len = 1;
364 if ((gid != egid) && (egid != -1))
365 {
366 glist[1] = egid;
367 glist_len = 2;
368 }
370 setgroups (glist_len, glist);
371 }
372 #endif /* HAVE_SETGROUPS */
374 status = setgid (gid);
375 if (status != 0)
376 {
377 ERROR ("exec plugin: setgid (%i) failed: %s",
378 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
379 exit (-1);
380 }
382 if (egid != -1)
383 {
384 status = setegid (egid);
385 if (status != 0)
386 {
387 ERROR ("exec plugin: setegid (%i) failed: %s",
388 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
389 exit (-1);
390 }
391 }
393 status = setuid (uid);
394 if (status != 0)
395 {
396 ERROR ("exec plugin: setuid (%i) failed: %s",
397 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
398 exit (-1);
399 }
401 status = execvp (pl->exec, pl->argv);
403 ERROR ("exec plugin: Failed to execute ``%s'': %s",
404 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
405 exit (-1);
406 } /* void exec_child }}} */
408 static void reset_signal_mask (void) /* {{{ */
409 {
410 sigset_t ss;
412 memset (&ss, 0, sizeof (ss));
413 sigemptyset (&ss);
414 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
415 } /* }}} void reset_signal_mask */
417 /*
418 * Creates three pipes (one for reading, one for writing and one for errors),
419 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
420 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
421 * of the child. Then is calls `exec_child'.
422 */
423 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
424 {
425 int fd_pipe_in[2];
426 int fd_pipe_out[2];
427 int fd_pipe_err[2];
428 char errbuf[1024];
429 int status;
430 int pid;
432 if (pl->pid != 0)
433 return (-1);
435 status = pipe (fd_pipe_in);
436 if (status != 0)
437 {
438 ERROR ("exec plugin: pipe failed: %s",
439 sstrerror (errno, errbuf, sizeof (errbuf)));
440 return (-1);
441 }
443 status = pipe (fd_pipe_out);
444 if (status != 0)
445 {
446 ERROR ("exec plugin: pipe failed: %s",
447 sstrerror (errno, errbuf, sizeof (errbuf)));
448 return (-1);
449 }
451 status = pipe (fd_pipe_err);
452 if (status != 0)
453 {
454 ERROR ("exec plugin: pipe failed: %s",
455 sstrerror (errno, errbuf, sizeof (errbuf)));
456 return (-1);
457 }
459 pid = fork ();
460 if (pid < 0)
461 {
462 ERROR ("exec plugin: fork failed: %s",
463 sstrerror (errno, errbuf, sizeof (errbuf)));
464 return (-1);
465 }
466 else if (pid == 0)
467 {
468 int fd_num;
469 int fd;
471 /* Close all file descriptors but the pipe end we need. */
472 fd_num = getdtablesize ();
473 for (fd = 0; fd < fd_num; fd++)
474 {
475 if ((fd == fd_pipe_in[0])
476 || (fd == fd_pipe_out[1])
477 || (fd == fd_pipe_err[1]))
478 continue;
479 close (fd);
480 }
482 /* Connect the `in' pipe to STDIN */
483 if (fd_pipe_in[0] != STDIN_FILENO)
484 {
485 dup2 (fd_pipe_in[0], STDIN_FILENO);
486 close (fd_pipe_in[0]);
487 }
489 /* Now connect the `out' pipe to STDOUT */
490 if (fd_pipe_out[1] != STDOUT_FILENO)
491 {
492 dup2 (fd_pipe_out[1], STDOUT_FILENO);
493 close (fd_pipe_out[1]);
494 }
496 /* Now connect the `err' pipe to STDERR */
497 if (fd_pipe_err[1] != STDERR_FILENO)
498 {
499 dup2 (fd_pipe_err[1], STDERR_FILENO);
500 close (fd_pipe_err[1]);
501 }
503 set_environment ();
505 /* Unblock all signals */
506 reset_signal_mask ();
508 exec_child (pl);
509 /* does not return */
510 }
512 close (fd_pipe_in[0]);
513 close (fd_pipe_out[1]);
514 close (fd_pipe_err[1]);
516 if (fd_in != NULL)
517 *fd_in = fd_pipe_in[1];
518 else
519 close (fd_pipe_in[1]);
521 if (fd_out != NULL)
522 *fd_out = fd_pipe_out[0];
523 else
524 close (fd_pipe_out[0]);
526 if (fd_err != NULL)
527 *fd_err = fd_pipe_err[0];
528 else
529 close (fd_pipe_err[0]);
531 return (pid);
532 } /* int fork_child }}} */
534 static int parse_line (char *buffer) /* {{{ */
535 {
536 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
537 return (handle_putval (stdout, buffer));
538 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
539 return (handle_putnotif (stdout, buffer));
540 else
541 {
542 ERROR ("exec plugin: Unable to parse command, ignoring line: \"%s\"",
543 buffer);
544 return (-1);
545 }
546 } /* int parse_line }}} */
548 static void *exec_read_one (void *arg) /* {{{ */
549 {
550 program_list_t *pl = (program_list_t *) arg;
551 int fd, fd_err, highest_fd;
552 fd_set fdset, copy;
553 int status;
554 char buffer[1200]; /* if not completely read */
555 char buffer_err[1024];
556 char *pbuffer = buffer;
557 char *pbuffer_err = buffer_err;
559 status = fork_child (pl, NULL, &fd, &fd_err);
560 if (status < 0)
561 {
562 /* Reset the "running" flag */
563 pthread_mutex_lock (&pl_lock);
564 pl->flags &= ~PL_RUNNING;
565 pthread_mutex_unlock (&pl_lock);
566 pthread_exit ((void *) 1);
567 }
568 pl->pid = status;
570 assert (pl->pid != 0);
572 FD_ZERO( &fdset );
573 FD_SET(fd, &fdset);
574 FD_SET(fd_err, &fdset);
576 /* Determine the highest file descriptor */
577 highest_fd = (fd > fd_err) ? fd : fd_err;
579 /* We use a copy of fdset, as select modifies it */
580 copy = fdset;
582 while (1)
583 {
584 int len;
586 status = select (highest_fd + 1, ©, NULL, NULL, NULL);
587 if (status < 0)
588 {
589 if (errno == EINTR)
590 continue;
591 break;
592 }
594 if (FD_ISSET(fd, ©))
595 {
596 char *pnl;
598 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
600 if (len < 0)
601 {
602 if (errno == EAGAIN || errno == EINTR) continue;
603 break;
604 }
605 else if (len == 0) break; /* We've reached EOF */
607 pbuffer[len] = '\0';
609 len += pbuffer - buffer;
610 pbuffer = buffer;
612 while ((pnl = strchr(pbuffer, '\n')))
613 {
614 *pnl = '\0';
615 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
617 parse_line (pbuffer);
619 pbuffer = ++pnl;
620 }
621 /* not completely read ? */
622 if (pbuffer - buffer < len)
623 {
624 len -= pbuffer - buffer;
625 memmove(buffer, pbuffer, len);
626 pbuffer = buffer + len;
627 }
628 else
629 pbuffer = buffer;
630 }
631 else if (FD_ISSET(fd_err, ©))
632 {
633 char *pnl;
635 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
637 if (len < 0)
638 {
639 if (errno == EAGAIN || errno == EINTR)
640 continue;
641 break;
642 }
643 else if (len == 0)
644 {
645 /* We've reached EOF */
646 NOTICE ("exec plugin: Program `%s' has closed STDERR.", pl->exec);
648 /* Remove file descriptor form select() set. */
649 FD_CLR (fd_err, &fdset);
650 copy = fdset;
651 highest_fd = fd;
653 /* Clean up file descriptor */
654 close (fd_err);
655 fd_err = -1;
656 continue;
657 }
659 pbuffer_err[len] = '\0';
661 len += pbuffer_err - buffer_err;
662 pbuffer_err = buffer_err;
664 while ((pnl = strchr(pbuffer_err, '\n')))
665 {
666 *pnl = '\0';
667 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
669 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
671 pbuffer_err = ++pnl;
672 }
673 /* not completely read ? */
674 if (pbuffer_err - buffer_err < len)
675 {
676 len -= pbuffer_err - buffer_err;
677 memmove(buffer_err, pbuffer_err, len);
678 pbuffer_err = buffer_err + len;
679 }
680 else
681 pbuffer_err = buffer_err;
682 }
683 /* reset copy */
684 copy = fdset;
685 }
687 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
688 if (waitpid (pl->pid, &status, 0) > 0)
689 pl->status = status;
691 DEBUG ("exec plugin: Child %i exited with status %i.",
692 (int) pl->pid, pl->status);
694 pl->pid = 0;
696 pthread_mutex_lock (&pl_lock);
697 pl->flags &= ~PL_RUNNING;
698 pthread_mutex_unlock (&pl_lock);
700 close (fd);
701 if (fd_err >= 0)
702 close (fd_err);
704 pthread_exit ((void *) 0);
705 return (NULL);
706 } /* void *exec_read_one }}} */
708 static void *exec_notification_one (void *arg) /* {{{ */
709 {
710 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
711 notification_t *n = &((program_list_and_notification_t *) arg)->n;
712 notification_meta_t *meta;
713 int fd;
714 FILE *fh;
715 int pid;
716 int status;
717 const char *severity;
719 pid = fork_child (pl, &fd, NULL, NULL);
720 if (pid < 0) {
721 sfree (arg);
722 pthread_exit ((void *) 1);
723 }
725 fh = fdopen (fd, "w");
726 if (fh == NULL)
727 {
728 char errbuf[1024];
729 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
730 sstrerror (errno, errbuf, sizeof (errbuf)));
731 kill (pl->pid, SIGTERM);
732 pl->pid = 0;
733 close (fd);
734 sfree (arg);
735 pthread_exit ((void *) 1);
736 }
738 severity = "FAILURE";
739 if (n->severity == NOTIF_WARNING)
740 severity = "WARNING";
741 else if (n->severity == NOTIF_OKAY)
742 severity = "OKAY";
744 fprintf (fh,
745 "Severity: %s\n"
746 "Time: %.3f\n",
747 severity, CDTIME_T_TO_DOUBLE (n->time));
749 /* Print the optional fields */
750 if (strlen (n->host) > 0)
751 fprintf (fh, "Host: %s\n", n->host);
752 if (strlen (n->plugin) > 0)
753 fprintf (fh, "Plugin: %s\n", n->plugin);
754 if (strlen (n->plugin_instance) > 0)
755 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
756 if (strlen (n->type) > 0)
757 fprintf (fh, "Type: %s\n", n->type);
758 if (strlen (n->type_instance) > 0)
759 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
761 for (meta = n->meta; meta != NULL; meta = meta->next)
762 {
763 if (meta->type == NM_TYPE_STRING)
764 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
765 else if (meta->type == NM_TYPE_SIGNED_INT)
766 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
767 else if (meta->type == NM_TYPE_UNSIGNED_INT)
768 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
769 else if (meta->type == NM_TYPE_DOUBLE)
770 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
771 else if (meta->type == NM_TYPE_BOOLEAN)
772 fprintf (fh, "%s: %s\n", meta->name,
773 meta->nm_value.nm_boolean ? "true" : "false");
774 }
776 fprintf (fh, "\n%s\n", n->message);
778 fflush (fh);
779 fclose (fh);
781 waitpid (pid, &status, 0);
783 DEBUG ("exec plugin: Child %i exited with status %i.",
784 pid, status);
786 if (n->meta != NULL)
787 plugin_notification_meta_free (n->meta);
788 n->meta = NULL;
789 sfree (arg);
790 pthread_exit ((void *) 0);
791 return (NULL);
792 } /* void *exec_notification_one }}} */
794 static int exec_init (void) /* {{{ */
795 {
796 struct sigaction sa;
798 memset (&sa, '\0', sizeof (sa));
799 sa.sa_handler = sigchld_handler;
800 sigaction (SIGCHLD, &sa, NULL);
802 return (0);
803 } /* int exec_init }}} */
805 static int exec_read (void) /* {{{ */
806 {
807 program_list_t *pl;
809 for (pl = pl_head; pl != NULL; pl = pl->next)
810 {
811 pthread_t t;
812 pthread_attr_t attr;
814 /* Only execute `normal' style executables here. */
815 if ((pl->flags & PL_NORMAL) == 0)
816 continue;
818 pthread_mutex_lock (&pl_lock);
819 /* Skip if a child is already running. */
820 if ((pl->flags & PL_RUNNING) != 0)
821 {
822 pthread_mutex_unlock (&pl_lock);
823 continue;
824 }
825 pl->flags |= PL_RUNNING;
826 pthread_mutex_unlock (&pl_lock);
828 pthread_attr_init (&attr);
829 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
830 plugin_thread_create (&t, &attr, exec_read_one, (void *) pl);
831 pthread_attr_destroy (&attr);
832 } /* for (pl) */
834 return (0);
835 } /* int exec_read }}} */
837 static int exec_notification (const notification_t *n, /* {{{ */
838 user_data_t __attribute__((unused)) *user_data)
839 {
840 program_list_t *pl;
841 program_list_and_notification_t *pln;
843 for (pl = pl_head; pl != NULL; pl = pl->next)
844 {
845 pthread_t t;
846 pthread_attr_t attr;
848 /* Only execute `notification' style executables here. */
849 if ((pl->flags & PL_NOTIF_ACTION) == 0)
850 continue;
852 /* Skip if a child is already running. */
853 if (pl->pid != 0)
854 continue;
856 pln = (program_list_and_notification_t *) malloc (sizeof
857 (program_list_and_notification_t));
858 if (pln == NULL)
859 {
860 ERROR ("exec plugin: malloc failed.");
861 continue;
862 }
864 pln->pl = pl;
865 memcpy (&pln->n, n, sizeof (notification_t));
867 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
868 * will run into an endless loop. */
869 pln->n.meta = NULL;
870 plugin_notification_meta_copy (&pln->n, n);
872 pthread_attr_init (&attr);
873 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
874 plugin_thread_create (&t, &attr, exec_notification_one, (void *) pln);
875 pthread_attr_destroy (&attr);
876 } /* for (pl) */
878 return (0);
879 } /* }}} int exec_notification */
881 static int exec_shutdown (void) /* {{{ */
882 {
883 program_list_t *pl;
884 program_list_t *next;
886 pl = pl_head;
887 while (pl != NULL)
888 {
889 next = pl->next;
891 if (pl->pid > 0)
892 {
893 kill (pl->pid, SIGTERM);
894 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
895 }
897 sfree (pl->user);
898 sfree (pl);
900 pl = next;
901 } /* while (pl) */
902 pl_head = NULL;
904 return (0);
905 } /* int exec_shutdown }}} */
907 void module_register (void)
908 {
909 plugin_register_complex_config ("exec", exec_config);
910 plugin_register_init ("exec", exec_init);
911 plugin_register_read ("exec", exec_read);
912 plugin_register_notification ("exec", exec_notification,
913 /* user_data = */ NULL);
914 plugin_register_shutdown ("exec", exec_shutdown);
915 } /* void module_register */
917 /*
918 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
919 */