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, int uid, int gid, int egid) /* {{{ */
291 {
292 int status;
293 char errbuf[1024];
295 #if HAVE_SETGROUPS
296 if (getuid () == 0)
297 {
298 gid_t glist[2];
299 size_t glist_len;
301 glist[0] = gid;
302 glist_len = 1;
304 if ((gid != egid) && (egid != -1))
305 {
306 glist[1] = egid;
307 glist_len = 2;
308 }
310 setgroups (glist_len, glist);
311 }
312 #endif /* HAVE_SETGROUPS */
314 status = setgid (gid);
315 if (status != 0)
316 {
317 ERROR ("exec plugin: setgid (%i) failed: %s",
318 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
319 exit (-1);
320 }
322 if (egid != -1)
323 {
324 status = setegid (egid);
325 if (status != 0)
326 {
327 ERROR ("exec plugin: setegid (%i) failed: %s",
328 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
329 exit (-1);
330 }
331 }
333 status = setuid (uid);
334 if (status != 0)
335 {
336 ERROR ("exec plugin: setuid (%i) failed: %s",
337 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
338 exit (-1);
339 }
341 status = execvp (pl->exec, pl->argv);
343 ERROR ("exec plugin: Failed to execute ``%s'': %s",
344 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
345 exit (-1);
346 } /* void exec_child }}} */
348 static void reset_signal_mask (void) /* {{{ */
349 {
350 sigset_t ss;
352 memset (&ss, 0, sizeof (ss));
353 sigemptyset (&ss);
354 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
355 } /* }}} void reset_signal_mask */
357 /*
358 * Creates three pipes (one for reading, one for writing and one for errors),
359 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
360 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
361 * of the child. Then is calls `exec_child'.
362 */
363 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
364 {
365 int fd_pipe_in[2];
366 int fd_pipe_out[2];
367 int fd_pipe_err[2];
368 char errbuf[1024];
369 int status;
370 int pid;
372 int uid;
373 int gid;
374 int egid;
376 struct passwd *sp_ptr;
377 struct passwd sp;
378 char nambuf[2048];
380 if (pl->pid != 0)
381 return (-1);
383 status = pipe (fd_pipe_in);
384 if (status != 0)
385 {
386 ERROR ("exec plugin: pipe failed: %s",
387 sstrerror (errno, errbuf, sizeof (errbuf)));
388 return (-1);
389 }
391 status = pipe (fd_pipe_out);
392 if (status != 0)
393 {
394 ERROR ("exec plugin: pipe failed: %s",
395 sstrerror (errno, errbuf, sizeof (errbuf)));
396 return (-1);
397 }
399 status = pipe (fd_pipe_err);
400 if (status != 0)
401 {
402 ERROR ("exec plugin: pipe failed: %s",
403 sstrerror (errno, errbuf, sizeof (errbuf)));
404 return (-1);
405 }
407 sp_ptr = NULL;
408 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
409 if (status != 0)
410 {
411 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
412 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
413 return (-1);
414 }
415 if (sp_ptr == NULL)
416 {
417 ERROR ("exec plugin: No such user: `%s'", pl->user);
418 return (-1);
419 }
421 uid = sp.pw_uid;
422 gid = sp.pw_gid;
423 if (uid == 0)
424 {
425 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
426 return (-1);
427 }
429 /* The group configured in the configfile is set as effective group, because
430 * this way the forked process can (re-)gain the user's primary group. */
431 egid = -1;
432 if (NULL != pl->group)
433 {
434 if ('\0' != *pl->group) {
435 struct group *gr_ptr = NULL;
436 struct group gr;
438 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
439 if (0 != status)
440 {
441 ERROR ("exec plugin: Failed to get group information "
442 "for group ``%s'': %s", pl->group,
443 sstrerror (errno, errbuf, sizeof (errbuf)));
444 return (-1);
445 }
446 if (NULL == gr_ptr)
447 {
448 ERROR ("exec plugin: No such group: `%s'", pl->group);
449 return (-1);
450 }
452 egid = gr.gr_gid;
453 }
454 else
455 {
456 egid = gid;
457 }
458 } /* if (pl->group == NULL) */
460 pid = fork ();
461 if (pid < 0)
462 {
463 ERROR ("exec plugin: fork failed: %s",
464 sstrerror (errno, errbuf, sizeof (errbuf)));
465 return (-1);
466 }
467 else if (pid == 0)
468 {
469 int fd_num;
470 int fd;
472 /* Close all file descriptors but the pipe end we need. */
473 fd_num = getdtablesize ();
474 for (fd = 0; fd < fd_num; fd++)
475 {
476 if ((fd == fd_pipe_in[0])
477 || (fd == fd_pipe_out[1])
478 || (fd == fd_pipe_err[1]))
479 continue;
480 close (fd);
481 }
483 /* Connect the `in' pipe to STDIN */
484 if (fd_pipe_in[0] != STDIN_FILENO)
485 {
486 dup2 (fd_pipe_in[0], STDIN_FILENO);
487 close (fd_pipe_in[0]);
488 }
490 /* Now connect the `out' pipe to STDOUT */
491 if (fd_pipe_out[1] != STDOUT_FILENO)
492 {
493 dup2 (fd_pipe_out[1], STDOUT_FILENO);
494 close (fd_pipe_out[1]);
495 }
497 /* Now connect the `err' pipe to STDERR */
498 if (fd_pipe_err[1] != STDERR_FILENO)
499 {
500 dup2 (fd_pipe_err[1], STDERR_FILENO);
501 close (fd_pipe_err[1]);
502 }
504 set_environment ();
506 /* Unblock all signals */
507 reset_signal_mask ();
509 exec_child (pl, uid, gid, egid);
510 /* does not return */
511 }
513 close (fd_pipe_in[0]);
514 close (fd_pipe_out[1]);
515 close (fd_pipe_err[1]);
517 if (fd_in != NULL)
518 *fd_in = fd_pipe_in[1];
519 else
520 close (fd_pipe_in[1]);
522 if (fd_out != NULL)
523 *fd_out = fd_pipe_out[0];
524 else
525 close (fd_pipe_out[0]);
527 if (fd_err != NULL)
528 *fd_err = fd_pipe_err[0];
529 else
530 close (fd_pipe_err[0]);
532 return (pid);
533 } /* int fork_child }}} */
535 static int parse_line (char *buffer) /* {{{ */
536 {
537 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
538 return (handle_putval (stdout, buffer));
539 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
540 return (handle_putnotif (stdout, buffer));
541 else
542 {
543 ERROR ("exec plugin: Unable to parse command, ignoring line: \"%s\"",
544 buffer);
545 return (-1);
546 }
547 } /* int parse_line }}} */
549 static void *exec_read_one (void *arg) /* {{{ */
550 {
551 program_list_t *pl = (program_list_t *) arg;
552 int fd, fd_err, highest_fd;
553 fd_set fdset, copy;
554 int status;
555 char buffer[1200]; /* if not completely read */
556 char buffer_err[1024];
557 char *pbuffer = buffer;
558 char *pbuffer_err = buffer_err;
560 status = fork_child (pl, NULL, &fd, &fd_err);
561 if (status < 0)
562 {
563 /* Reset the "running" flag */
564 pthread_mutex_lock (&pl_lock);
565 pl->flags &= ~PL_RUNNING;
566 pthread_mutex_unlock (&pl_lock);
567 pthread_exit ((void *) 1);
568 }
569 pl->pid = status;
571 assert (pl->pid != 0);
573 FD_ZERO( &fdset );
574 FD_SET(fd, &fdset);
575 FD_SET(fd_err, &fdset);
577 /* Determine the highest file descriptor */
578 highest_fd = (fd > fd_err) ? fd : fd_err;
580 /* We use a copy of fdset, as select modifies it */
581 copy = fdset;
583 while (1)
584 {
585 int len;
587 status = select (highest_fd + 1, ©, NULL, NULL, NULL);
588 if (status < 0)
589 {
590 if (errno == EINTR)
591 continue;
592 break;
593 }
595 if (FD_ISSET(fd, ©))
596 {
597 char *pnl;
599 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
601 if (len < 0)
602 {
603 if (errno == EAGAIN || errno == EINTR) continue;
604 break;
605 }
606 else if (len == 0) break; /* We've reached EOF */
608 pbuffer[len] = '\0';
610 len += pbuffer - buffer;
611 pbuffer = buffer;
613 while ((pnl = strchr(pbuffer, '\n')))
614 {
615 *pnl = '\0';
616 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
618 parse_line (pbuffer);
620 pbuffer = ++pnl;
621 }
622 /* not completely read ? */
623 if (pbuffer - buffer < len)
624 {
625 len -= pbuffer - buffer;
626 memmove(buffer, pbuffer, len);
627 pbuffer = buffer + len;
628 }
629 else
630 pbuffer = buffer;
631 }
632 else if (FD_ISSET(fd_err, ©))
633 {
634 char *pnl;
636 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
638 if (len < 0)
639 {
640 if (errno == EAGAIN || errno == EINTR)
641 continue;
642 break;
643 }
644 else if (len == 0)
645 {
646 /* We've reached EOF */
647 NOTICE ("exec plugin: Program `%s' has closed STDERR.", pl->exec);
649 /* Remove file descriptor form select() set. */
650 FD_CLR (fd_err, &fdset);
651 copy = fdset;
652 highest_fd = fd;
654 /* Clean up file descriptor */
655 close (fd_err);
656 fd_err = -1;
657 continue;
658 }
660 pbuffer_err[len] = '\0';
662 len += pbuffer_err - buffer_err;
663 pbuffer_err = buffer_err;
665 while ((pnl = strchr(pbuffer_err, '\n')))
666 {
667 *pnl = '\0';
668 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
670 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
672 pbuffer_err = ++pnl;
673 }
674 /* not completely read ? */
675 if (pbuffer_err - buffer_err < len)
676 {
677 len -= pbuffer_err - buffer_err;
678 memmove(buffer_err, pbuffer_err, len);
679 pbuffer_err = buffer_err + len;
680 }
681 else
682 pbuffer_err = buffer_err;
683 }
684 /* reset copy */
685 copy = fdset;
686 }
688 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
689 if (waitpid (pl->pid, &status, 0) > 0)
690 pl->status = status;
692 DEBUG ("exec plugin: Child %i exited with status %i.",
693 (int) pl->pid, pl->status);
695 pl->pid = 0;
697 pthread_mutex_lock (&pl_lock);
698 pl->flags &= ~PL_RUNNING;
699 pthread_mutex_unlock (&pl_lock);
701 close (fd);
702 if (fd_err >= 0)
703 close (fd_err);
705 pthread_exit ((void *) 0);
706 return (NULL);
707 } /* void *exec_read_one }}} */
709 static void *exec_notification_one (void *arg) /* {{{ */
710 {
711 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
712 notification_t *n = &((program_list_and_notification_t *) arg)->n;
713 notification_meta_t *meta;
714 int fd;
715 FILE *fh;
716 int pid;
717 int status;
718 const char *severity;
720 pid = fork_child (pl, &fd, NULL, NULL);
721 if (pid < 0) {
722 sfree (arg);
723 pthread_exit ((void *) 1);
724 }
726 fh = fdopen (fd, "w");
727 if (fh == NULL)
728 {
729 char errbuf[1024];
730 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
731 sstrerror (errno, errbuf, sizeof (errbuf)));
732 kill (pl->pid, SIGTERM);
733 pl->pid = 0;
734 close (fd);
735 sfree (arg);
736 pthread_exit ((void *) 1);
737 }
739 severity = "FAILURE";
740 if (n->severity == NOTIF_WARNING)
741 severity = "WARNING";
742 else if (n->severity == NOTIF_OKAY)
743 severity = "OKAY";
745 fprintf (fh,
746 "Severity: %s\n"
747 "Time: %.3f\n",
748 severity, CDTIME_T_TO_DOUBLE (n->time));
750 /* Print the optional fields */
751 if (strlen (n->host) > 0)
752 fprintf (fh, "Host: %s\n", n->host);
753 if (strlen (n->plugin) > 0)
754 fprintf (fh, "Plugin: %s\n", n->plugin);
755 if (strlen (n->plugin_instance) > 0)
756 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
757 if (strlen (n->type) > 0)
758 fprintf (fh, "Type: %s\n", n->type);
759 if (strlen (n->type_instance) > 0)
760 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
762 for (meta = n->meta; meta != NULL; meta = meta->next)
763 {
764 if (meta->type == NM_TYPE_STRING)
765 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
766 else if (meta->type == NM_TYPE_SIGNED_INT)
767 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
768 else if (meta->type == NM_TYPE_UNSIGNED_INT)
769 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
770 else if (meta->type == NM_TYPE_DOUBLE)
771 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
772 else if (meta->type == NM_TYPE_BOOLEAN)
773 fprintf (fh, "%s: %s\n", meta->name,
774 meta->nm_value.nm_boolean ? "true" : "false");
775 }
777 fprintf (fh, "\n%s\n", n->message);
779 fflush (fh);
780 fclose (fh);
782 waitpid (pid, &status, 0);
784 DEBUG ("exec plugin: Child %i exited with status %i.",
785 pid, status);
787 if (n->meta != NULL)
788 plugin_notification_meta_free (n->meta);
789 n->meta = NULL;
790 sfree (arg);
791 pthread_exit ((void *) 0);
792 return (NULL);
793 } /* void *exec_notification_one }}} */
795 static int exec_init (void) /* {{{ */
796 {
797 struct sigaction sa;
799 memset (&sa, '\0', sizeof (sa));
800 sa.sa_handler = sigchld_handler;
801 sigaction (SIGCHLD, &sa, NULL);
803 return (0);
804 } /* int exec_init }}} */
806 static int exec_read (void) /* {{{ */
807 {
808 program_list_t *pl;
810 for (pl = pl_head; pl != NULL; pl = pl->next)
811 {
812 pthread_t t;
813 pthread_attr_t attr;
815 /* Only execute `normal' style executables here. */
816 if ((pl->flags & PL_NORMAL) == 0)
817 continue;
819 pthread_mutex_lock (&pl_lock);
820 /* Skip if a child is already running. */
821 if ((pl->flags & PL_RUNNING) != 0)
822 {
823 pthread_mutex_unlock (&pl_lock);
824 continue;
825 }
826 pl->flags |= PL_RUNNING;
827 pthread_mutex_unlock (&pl_lock);
829 pthread_attr_init (&attr);
830 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
831 plugin_thread_create (&t, &attr, exec_read_one, (void *) pl);
832 pthread_attr_destroy (&attr);
833 } /* for (pl) */
835 return (0);
836 } /* int exec_read }}} */
838 static int exec_notification (const notification_t *n, /* {{{ */
839 user_data_t __attribute__((unused)) *user_data)
840 {
841 program_list_t *pl;
842 program_list_and_notification_t *pln;
844 for (pl = pl_head; pl != NULL; pl = pl->next)
845 {
846 pthread_t t;
847 pthread_attr_t attr;
849 /* Only execute `notification' style executables here. */
850 if ((pl->flags & PL_NOTIF_ACTION) == 0)
851 continue;
853 /* Skip if a child is already running. */
854 if (pl->pid != 0)
855 continue;
857 pln = (program_list_and_notification_t *) malloc (sizeof
858 (program_list_and_notification_t));
859 if (pln == NULL)
860 {
861 ERROR ("exec plugin: malloc failed.");
862 continue;
863 }
865 pln->pl = pl;
866 memcpy (&pln->n, n, sizeof (notification_t));
868 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
869 * will run into an endless loop. */
870 pln->n.meta = NULL;
871 plugin_notification_meta_copy (&pln->n, n);
873 pthread_attr_init (&attr);
874 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
875 plugin_thread_create (&t, &attr, exec_notification_one, (void *) pln);
876 pthread_attr_destroy (&attr);
877 } /* for (pl) */
879 return (0);
880 } /* }}} int exec_notification */
882 static int exec_shutdown (void) /* {{{ */
883 {
884 program_list_t *pl;
885 program_list_t *next;
887 pl = pl_head;
888 while (pl != NULL)
889 {
890 next = pl->next;
892 if (pl->pid > 0)
893 {
894 kill (pl->pid, SIGTERM);
895 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
896 }
898 sfree (pl->user);
899 sfree (pl);
901 pl = next;
902 } /* while (pl) */
903 pl_head = NULL;
905 return (0);
906 } /* int exec_shutdown }}} */
908 void module_register (void)
909 {
910 plugin_register_complex_config ("exec", exec_config);
911 plugin_register_init ("exec", exec_init);
912 plugin_register_read ("exec", exec_read);
913 plugin_register_notification ("exec", exec_notification,
914 /* user_data = */ NULL);
915 plugin_register_shutdown ("exec", exec_shutdown);
916 } /* void module_register */
918 /*
919 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
920 */