4c45dc158a267951cde5a8d608fe25be905f0a61
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 = malloc (sizeof (*pl));
130 if (pl == NULL)
131 {
132 ERROR ("exec plugin: malloc failed.");
133 return (-1);
134 }
135 memset (pl, '\0', sizeof (program_list_t));
137 if (strcasecmp ("NotificationExec", ci->key) == 0)
138 pl->flags |= PL_NOTIF_ACTION;
139 else
140 pl->flags |= PL_NORMAL;
142 pl->user = strdup (ci->values[0].value.string);
143 if (pl->user == NULL)
144 {
145 ERROR ("exec plugin: strdup failed.");
146 sfree (pl);
147 return (-1);
148 }
150 pl->group = strchr (pl->user, ':');
151 if (pl->group != NULL)
152 {
153 *pl->group = '\0';
154 pl->group++;
155 }
157 pl->exec = strdup (ci->values[1].value.string);
158 if (pl->exec == NULL)
159 {
160 ERROR ("exec plugin: strdup failed.");
161 sfree (pl->user);
162 sfree (pl);
163 return (-1);
164 }
166 pl->argv = malloc (ci->values_num * sizeof (*pl->argv));
167 if (pl->argv == NULL)
168 {
169 ERROR ("exec plugin: malloc failed.");
170 sfree (pl->exec);
171 sfree (pl->user);
172 sfree (pl);
173 return (-1);
174 }
175 memset (pl->argv, '\0', ci->values_num * sizeof (char *));
177 {
178 char *tmp = strrchr (ci->values[1].value.string, '/');
179 if (tmp == NULL)
180 sstrncpy (buffer, ci->values[1].value.string, sizeof (buffer));
181 else
182 sstrncpy (buffer, tmp + 1, sizeof (buffer));
183 }
184 pl->argv[0] = strdup (buffer);
185 if (pl->argv[0] == NULL)
186 {
187 ERROR ("exec plugin: malloc failed.");
188 sfree (pl->argv);
189 sfree (pl->exec);
190 sfree (pl->user);
191 sfree (pl);
192 return (-1);
193 }
195 for (i = 1; i < (ci->values_num - 1); i++)
196 {
197 if (ci->values[i + 1].type == OCONFIG_TYPE_STRING)
198 {
199 pl->argv[i] = strdup (ci->values[i + 1].value.string);
200 }
201 else
202 {
203 if (ci->values[i + 1].type == OCONFIG_TYPE_NUMBER)
204 {
205 ssnprintf (buffer, sizeof (buffer), "%lf",
206 ci->values[i + 1].value.number);
207 }
208 else
209 {
210 if (ci->values[i + 1].value.boolean)
211 sstrncpy (buffer, "true", sizeof (buffer));
212 else
213 sstrncpy (buffer, "false", sizeof (buffer));
214 }
216 pl->argv[i] = strdup (buffer);
217 }
219 if (pl->argv[i] == NULL)
220 {
221 ERROR ("exec plugin: strdup failed.");
222 break;
223 }
224 } /* for (i) */
226 if (i < (ci->values_num - 1))
227 {
228 while ((--i) >= 0)
229 {
230 sfree (pl->argv[i]);
231 }
232 sfree (pl->argv);
233 sfree (pl->exec);
234 sfree (pl->user);
235 sfree (pl);
236 return (-1);
237 }
239 for (i = 0; pl->argv[i] != NULL; i++)
240 {
241 DEBUG ("exec plugin: argv[%i] = %s", i, pl->argv[i]);
242 }
244 pl->next = pl_head;
245 pl_head = pl;
247 return (0);
248 } /* int exec_config_exec }}} */
250 static int exec_config (oconfig_item_t *ci) /* {{{ */
251 {
252 int i;
254 for (i = 0; i < ci->children_num; i++)
255 {
256 oconfig_item_t *child = ci->children + i;
257 if ((strcasecmp ("Exec", child->key) == 0)
258 || (strcasecmp ("NotificationExec", child->key) == 0))
259 exec_config_exec (child);
260 else
261 {
262 WARNING ("exec plugin: Unknown config option `%s'.", child->key);
263 }
264 } /* for (i) */
266 return (0);
267 } /* int exec_config }}} */
269 static void set_environment (void) /* {{{ */
270 {
271 char buffer[1024];
273 #ifdef HAVE_SETENV
274 ssnprintf (buffer, sizeof (buffer), "%.3f",
275 CDTIME_T_TO_DOUBLE (plugin_get_interval ()));
276 setenv ("COLLECTD_INTERVAL", buffer, /* overwrite = */ 1);
278 ssnprintf (buffer, sizeof (buffer), "%s", hostname_g);
279 setenv ("COLLECTD_HOSTNAME", buffer, /* overwrite = */ 1);
280 #else
281 ssnprintf (buffer, sizeof (buffer), "COLLECTD_INTERVAL=%.3f",
282 CDTIME_T_TO_DOUBLE (plugin_get_interval ()));
283 putenv (buffer);
285 ssnprintf (buffer, sizeof (buffer), "COLLECTD_HOSTNAME=%s", hostname_g);
286 putenv (buffer);
287 #endif
288 } /* }}} void set_environment */
290 __attribute__((noreturn))
291 static void exec_child (program_list_t *pl, int uid, int gid, int egid) /* {{{ */
292 {
293 int status;
294 char errbuf[1024];
296 #if HAVE_SETGROUPS
297 if (getuid () == 0)
298 {
299 gid_t glist[2];
300 size_t glist_len;
302 glist[0] = gid;
303 glist_len = 1;
305 if ((gid != egid) && (egid != -1))
306 {
307 glist[1] = egid;
308 glist_len = 2;
309 }
311 setgroups (glist_len, glist);
312 }
313 #endif /* HAVE_SETGROUPS */
315 status = setgid (gid);
316 if (status != 0)
317 {
318 ERROR ("exec plugin: setgid (%i) failed: %s",
319 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
320 exit (-1);
321 }
323 if (egid != -1)
324 {
325 status = setegid (egid);
326 if (status != 0)
327 {
328 ERROR ("exec plugin: setegid (%i) failed: %s",
329 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
330 exit (-1);
331 }
332 }
334 status = setuid (uid);
335 if (status != 0)
336 {
337 ERROR ("exec plugin: setuid (%i) failed: %s",
338 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
339 exit (-1);
340 }
342 execvp (pl->exec, pl->argv);
344 ERROR ("exec plugin: Failed to execute ``%s'': %s",
345 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
346 exit (-1);
347 } /* void exec_child }}} */
349 static void reset_signal_mask (void) /* {{{ */
350 {
351 sigset_t ss;
353 memset (&ss, 0, sizeof (ss));
354 sigemptyset (&ss);
355 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
356 } /* }}} void reset_signal_mask */
358 static int create_pipe (int fd_pipe[2]) /* {{{ */
359 {
360 char errbuf[1024];
361 int status;
363 status = pipe (fd_pipe);
364 if (status != 0)
365 {
366 ERROR ("exec plugin: pipe failed: %s",
367 sstrerror (errno, errbuf, sizeof (errbuf)));
368 return (-1);
369 }
371 return 0;
372 } /* }}} int create_pipe */
374 static void close_pipe (int fd_pipe[2]) /* {{{ */
375 {
376 if (fd_pipe[0] != -1)
377 close (fd_pipe[0]);
379 if (fd_pipe[1] != -1)
380 close (fd_pipe[1]);
381 } /* }}} void close_pipe */
383 /*
384 * Creates three pipes (one for reading, one for writing and one for errors),
385 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
386 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
387 * of the child. Then is calls `exec_child'.
388 */
389 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
390 {
391 int fd_pipe_in[2] = {-1, -1};
392 int fd_pipe_out[2] = {-1, -1};
393 int fd_pipe_err[2] = {-1, -1};
394 char errbuf[1024];
395 int status;
396 int pid;
398 int uid;
399 int gid;
400 int egid;
402 struct passwd *sp_ptr;
403 struct passwd sp;
404 char nambuf[2048];
406 if (pl->pid != 0)
407 return (-1);
409 if ((create_pipe(fd_pipe_in) == -1)
410 || (create_pipe(fd_pipe_out) == -1)
411 || (create_pipe(fd_pipe_err) == -1))
412 goto failed;
414 sp_ptr = NULL;
415 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
416 if (status != 0)
417 {
418 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
419 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
420 goto failed;
421 }
423 if (sp_ptr == NULL)
424 {
425 ERROR ("exec plugin: No such user: `%s'", pl->user);
426 goto failed;
427 }
429 uid = sp.pw_uid;
430 gid = sp.pw_gid;
431 if (uid == 0)
432 {
433 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
434 goto failed;
435 }
437 /* The group configured in the configfile is set as effective group, because
438 * this way the forked process can (re-)gain the user's primary group. */
439 egid = -1;
440 if (NULL != pl->group)
441 {
442 if ('\0' != *pl->group) {
443 struct group *gr_ptr = NULL;
444 struct group gr;
446 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
447 if (0 != status)
448 {
449 ERROR ("exec plugin: Failed to get group information "
450 "for group ``%s'': %s", pl->group,
451 sstrerror (errno, errbuf, sizeof (errbuf)));
452 goto failed;
453 }
454 if (NULL == gr_ptr)
455 {
456 ERROR ("exec plugin: No such group: `%s'", pl->group);
457 goto failed;
458 }
460 egid = gr.gr_gid;
461 }
462 else
463 {
464 egid = gid;
465 }
466 } /* if (pl->group == NULL) */
468 pid = fork ();
469 if (pid < 0)
470 {
471 ERROR ("exec plugin: fork failed: %s",
472 sstrerror (errno, errbuf, sizeof (errbuf)));
473 goto failed;
474 }
475 else if (pid == 0)
476 {
477 int fd_num;
478 int fd;
480 /* Close all file descriptors but the pipe end we need. */
481 fd_num = getdtablesize ();
482 for (fd = 0; fd < fd_num; fd++)
483 {
484 if ((fd == fd_pipe_in[0])
485 || (fd == fd_pipe_out[1])
486 || (fd == fd_pipe_err[1]))
487 continue;
488 close (fd);
489 }
491 /* Connect the `in' pipe to STDIN */
492 if (fd_pipe_in[0] != STDIN_FILENO)
493 {
494 dup2 (fd_pipe_in[0], STDIN_FILENO);
495 close (fd_pipe_in[0]);
496 }
498 /* Now connect the `out' pipe to STDOUT */
499 if (fd_pipe_out[1] != STDOUT_FILENO)
500 {
501 dup2 (fd_pipe_out[1], STDOUT_FILENO);
502 close (fd_pipe_out[1]);
503 }
505 /* Now connect the `err' pipe to STDERR */
506 if (fd_pipe_err[1] != STDERR_FILENO)
507 {
508 dup2 (fd_pipe_err[1], STDERR_FILENO);
509 close (fd_pipe_err[1]);
510 }
512 set_environment ();
514 /* Unblock all signals */
515 reset_signal_mask ();
517 exec_child (pl, uid, gid, egid);
518 /* does not return */
519 }
521 close (fd_pipe_in[0]);
522 close (fd_pipe_out[1]);
523 close (fd_pipe_err[1]);
525 if (fd_in != NULL)
526 *fd_in = fd_pipe_in[1];
527 else
528 close (fd_pipe_in[1]);
530 if (fd_out != NULL)
531 *fd_out = fd_pipe_out[0];
532 else
533 close (fd_pipe_out[0]);
535 if (fd_err != NULL)
536 *fd_err = fd_pipe_err[0];
537 else
538 close (fd_pipe_err[0]);
540 return (pid);
542 failed:
543 close_pipe(fd_pipe_in);
544 close_pipe(fd_pipe_out);
545 close_pipe(fd_pipe_err);
547 return (-1);
548 } /* int fork_child }}} */
550 static int parse_line (char *buffer) /* {{{ */
551 {
552 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
553 return (handle_putval (stdout, buffer));
554 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
555 return (handle_putnotif (stdout, buffer));
556 else
557 {
558 ERROR ("exec plugin: Unable to parse command, ignoring line: \"%s\"",
559 buffer);
560 return (-1);
561 }
562 } /* int parse_line }}} */
564 static void *exec_read_one (void *arg) /* {{{ */
565 {
566 program_list_t *pl = (program_list_t *) arg;
567 int fd, fd_err, highest_fd;
568 fd_set fdset, copy;
569 int status;
570 char buffer[1200]; /* if not completely read */
571 char buffer_err[1024];
572 char *pbuffer = buffer;
573 char *pbuffer_err = buffer_err;
575 status = fork_child (pl, NULL, &fd, &fd_err);
576 if (status < 0)
577 {
578 /* Reset the "running" flag */
579 pthread_mutex_lock (&pl_lock);
580 pl->flags &= ~PL_RUNNING;
581 pthread_mutex_unlock (&pl_lock);
582 pthread_exit ((void *) 1);
583 }
584 pl->pid = status;
586 assert (pl->pid != 0);
588 FD_ZERO( &fdset );
589 FD_SET(fd, &fdset);
590 FD_SET(fd_err, &fdset);
592 /* Determine the highest file descriptor */
593 highest_fd = (fd > fd_err) ? fd : fd_err;
595 /* We use a copy of fdset, as select modifies it */
596 copy = fdset;
598 while (1)
599 {
600 int len;
602 status = select (highest_fd + 1, ©, NULL, NULL, NULL);
603 if (status < 0)
604 {
605 if (errno == EINTR)
606 continue;
607 break;
608 }
610 if (FD_ISSET(fd, ©))
611 {
612 char *pnl;
614 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
616 if (len < 0)
617 {
618 if (errno == EAGAIN || errno == EINTR) continue;
619 break;
620 }
621 else if (len == 0) break; /* We've reached EOF */
623 pbuffer[len] = '\0';
625 len += pbuffer - buffer;
626 pbuffer = buffer;
628 while ((pnl = strchr(pbuffer, '\n')))
629 {
630 *pnl = '\0';
631 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
633 parse_line (pbuffer);
635 pbuffer = ++pnl;
636 }
637 /* not completely read ? */
638 if (pbuffer - buffer < len)
639 {
640 len -= pbuffer - buffer;
641 memmove(buffer, pbuffer, len);
642 pbuffer = buffer + len;
643 }
644 else
645 pbuffer = buffer;
646 }
647 else if (FD_ISSET(fd_err, ©))
648 {
649 char *pnl;
651 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
653 if (len < 0)
654 {
655 if (errno == EAGAIN || errno == EINTR)
656 continue;
657 break;
658 }
659 else if (len == 0)
660 {
661 /* We've reached EOF */
662 NOTICE ("exec plugin: Program `%s' has closed STDERR.", pl->exec);
664 /* Remove file descriptor form select() set. */
665 FD_CLR (fd_err, &fdset);
666 copy = fdset;
667 highest_fd = fd;
669 /* Clean up file descriptor */
670 close (fd_err);
671 fd_err = -1;
672 continue;
673 }
675 pbuffer_err[len] = '\0';
677 len += pbuffer_err - buffer_err;
678 pbuffer_err = buffer_err;
680 while ((pnl = strchr(pbuffer_err, '\n')))
681 {
682 *pnl = '\0';
683 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
685 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
687 pbuffer_err = ++pnl;
688 }
689 /* not completely read ? */
690 if (pbuffer_err - buffer_err < len)
691 {
692 len -= pbuffer_err - buffer_err;
693 memmove(buffer_err, pbuffer_err, len);
694 pbuffer_err = buffer_err + len;
695 }
696 else
697 pbuffer_err = buffer_err;
698 }
699 /* reset copy */
700 copy = fdset;
701 }
703 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
704 if (waitpid (pl->pid, &status, 0) > 0)
705 pl->status = status;
707 DEBUG ("exec plugin: Child %i exited with status %i.",
708 (int) pl->pid, pl->status);
710 pl->pid = 0;
712 pthread_mutex_lock (&pl_lock);
713 pl->flags &= ~PL_RUNNING;
714 pthread_mutex_unlock (&pl_lock);
716 close (fd);
717 if (fd_err >= 0)
718 close (fd_err);
720 pthread_exit ((void *) 0);
721 return (NULL);
722 } /* void *exec_read_one }}} */
724 static void *exec_notification_one (void *arg) /* {{{ */
725 {
726 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
727 notification_t *n = &((program_list_and_notification_t *) arg)->n;
728 notification_meta_t *meta;
729 int fd;
730 FILE *fh;
731 int pid;
732 int status;
733 const char *severity;
735 pid = fork_child (pl, &fd, NULL, NULL);
736 if (pid < 0) {
737 sfree (arg);
738 pthread_exit ((void *) 1);
739 }
741 fh = fdopen (fd, "w");
742 if (fh == NULL)
743 {
744 char errbuf[1024];
745 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
746 sstrerror (errno, errbuf, sizeof (errbuf)));
747 kill (pl->pid, SIGTERM);
748 pl->pid = 0;
749 close (fd);
750 sfree (arg);
751 pthread_exit ((void *) 1);
752 }
754 severity = "FAILURE";
755 if (n->severity == NOTIF_WARNING)
756 severity = "WARNING";
757 else if (n->severity == NOTIF_OKAY)
758 severity = "OKAY";
760 fprintf (fh,
761 "Severity: %s\n"
762 "Time: %.3f\n",
763 severity, CDTIME_T_TO_DOUBLE (n->time));
765 /* Print the optional fields */
766 if (strlen (n->host) > 0)
767 fprintf (fh, "Host: %s\n", n->host);
768 if (strlen (n->plugin) > 0)
769 fprintf (fh, "Plugin: %s\n", n->plugin);
770 if (strlen (n->plugin_instance) > 0)
771 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
772 if (strlen (n->type) > 0)
773 fprintf (fh, "Type: %s\n", n->type);
774 if (strlen (n->type_instance) > 0)
775 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
777 for (meta = n->meta; meta != NULL; meta = meta->next)
778 {
779 if (meta->type == NM_TYPE_STRING)
780 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
781 else if (meta->type == NM_TYPE_SIGNED_INT)
782 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
783 else if (meta->type == NM_TYPE_UNSIGNED_INT)
784 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
785 else if (meta->type == NM_TYPE_DOUBLE)
786 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
787 else if (meta->type == NM_TYPE_BOOLEAN)
788 fprintf (fh, "%s: %s\n", meta->name,
789 meta->nm_value.nm_boolean ? "true" : "false");
790 }
792 fprintf (fh, "\n%s\n", n->message);
794 fflush (fh);
795 fclose (fh);
797 waitpid (pid, &status, 0);
799 DEBUG ("exec plugin: Child %i exited with status %i.",
800 pid, status);
802 if (n->meta != NULL)
803 plugin_notification_meta_free (n->meta);
804 n->meta = NULL;
805 sfree (arg);
806 pthread_exit ((void *) 0);
807 return (NULL);
808 } /* void *exec_notification_one }}} */
810 static int exec_init (void) /* {{{ */
811 {
812 struct sigaction sa;
814 memset (&sa, '\0', sizeof (sa));
815 sa.sa_handler = sigchld_handler;
816 sigaction (SIGCHLD, &sa, NULL);
818 return (0);
819 } /* int exec_init }}} */
821 static int exec_read (void) /* {{{ */
822 {
823 program_list_t *pl;
825 for (pl = pl_head; pl != NULL; pl = pl->next)
826 {
827 pthread_t t;
828 pthread_attr_t attr;
830 /* Only execute `normal' style executables here. */
831 if ((pl->flags & PL_NORMAL) == 0)
832 continue;
834 pthread_mutex_lock (&pl_lock);
835 /* Skip if a child is already running. */
836 if ((pl->flags & PL_RUNNING) != 0)
837 {
838 pthread_mutex_unlock (&pl_lock);
839 continue;
840 }
841 pl->flags |= PL_RUNNING;
842 pthread_mutex_unlock (&pl_lock);
844 pthread_attr_init (&attr);
845 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
846 plugin_thread_create (&t, &attr, exec_read_one, (void *) pl);
847 pthread_attr_destroy (&attr);
848 } /* for (pl) */
850 return (0);
851 } /* int exec_read }}} */
853 static int exec_notification (const notification_t *n, /* {{{ */
854 user_data_t __attribute__((unused)) *user_data)
855 {
856 program_list_t *pl;
857 program_list_and_notification_t *pln;
859 for (pl = pl_head; pl != NULL; pl = pl->next)
860 {
861 pthread_t t;
862 pthread_attr_t attr;
864 /* Only execute `notification' style executables here. */
865 if ((pl->flags & PL_NOTIF_ACTION) == 0)
866 continue;
868 /* Skip if a child is already running. */
869 if (pl->pid != 0)
870 continue;
872 pln = malloc (sizeof (*pln));
873 if (pln == NULL)
874 {
875 ERROR ("exec plugin: malloc failed.");
876 continue;
877 }
879 pln->pl = pl;
880 memcpy (&pln->n, n, sizeof (notification_t));
882 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
883 * will run into an endless loop. */
884 pln->n.meta = NULL;
885 plugin_notification_meta_copy (&pln->n, n);
887 pthread_attr_init (&attr);
888 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
889 plugin_thread_create (&t, &attr, exec_notification_one, (void *) pln);
890 pthread_attr_destroy (&attr);
891 } /* for (pl) */
893 return (0);
894 } /* }}} int exec_notification */
896 static int exec_shutdown (void) /* {{{ */
897 {
898 program_list_t *pl;
899 program_list_t *next;
901 pl = pl_head;
902 while (pl != NULL)
903 {
904 next = pl->next;
906 if (pl->pid > 0)
907 {
908 kill (pl->pid, SIGTERM);
909 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
910 }
912 sfree (pl->user);
913 sfree (pl);
915 pl = next;
916 } /* while (pl) */
917 pl_head = NULL;
919 return (0);
920 } /* int exec_shutdown }}} */
922 void module_register (void)
923 {
924 plugin_register_complex_config ("exec", exec_config);
925 plugin_register_init ("exec", exec_init);
926 plugin_register_read ("exec", exec_read);
927 plugin_register_notification ("exec", exec_notification,
928 /* user_data = */ NULL);
929 plugin_register_shutdown ("exec", exec_shutdown);
930 } /* void module_register */
932 /*
933 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
934 */