109a32a03c55e13b9f903abdd0abb97cb5113b25
1 /**
2 * collectd - src/filter_chain.h
3 * Copyright (C) 2008 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 /*
23 * First tell the compiler to stick to the C99 and POSIX standards as close as
24 * possible.
25 */
26 #ifndef __STRICT_ANSI__ /* {{{ */
27 # define __STRICT_ANSI__
28 #endif
30 #ifndef _ISOC99_SOURCE
31 # define _ISOC99_SOURCE
32 #endif
34 #ifdef _POSIX_C_SOURCE
35 # undef _POSIX_C_SOURCE
36 #endif
37 #define _POSIX_C_SOURCE 200112L
39 #if 0
40 /* Single UNIX needed for strdup. */
41 #ifdef _XOPEN_SOURCE
42 # undef _XOPEN_SOURCE
43 #endif
44 #define _XOPEN_SOURCE 500
45 #endif
47 #ifndef _REENTRANT
48 # define _REENTRANT
49 #endif
51 #ifndef _THREAD_SAFE
52 # define _THREAD_SAFE
53 #endif
55 #ifdef _GNU_SOURCE
56 # undef _GNU_SOURCE
57 #endif
58 /* }}} */
60 #include "collectd.h"
61 #include "configfile.h"
62 #include "plugin.h"
63 #include "common.h"
64 #include "filter_chain.h"
66 /*
67 * Data types
68 */
69 /* List of matches, used in fc_rule_t and for the global `match_list_head'
70 * variable. */
71 struct fc_match_s;
72 typedef struct fc_match_s fc_match_t; /* {{{ */
73 struct fc_match_s
74 {
75 char name[DATA_MAX_NAME_LEN];
76 match_proc_t proc;
77 void *user_data;
78 fc_match_t *next;
79 }; /* }}} */
81 /* List of targets, used in fc_rule_t and for the global `target_list_head'
82 * variable. */
83 struct fc_target_s;
84 typedef struct fc_target_s fc_target_t; /* {{{ */
85 struct fc_target_s
86 {
87 char name[DATA_MAX_NAME_LEN];
88 void *user_data;
89 target_proc_t proc;
90 fc_target_t *next;
91 }; /* }}} */
93 /* List of rules, used in fc_chain_t */
94 struct fc_rule_s;
95 typedef struct fc_rule_s fc_rule_t; /* {{{ */
96 struct fc_rule_s
97 {
98 char name[DATA_MAX_NAME_LEN];
99 fc_match_t *matches;
100 fc_target_t *targets;
101 fc_rule_t *next;
102 }; /* }}} */
104 /* List of chains, used for `chain_list_head' */
105 struct fc_chain_s;
106 typedef struct fc_chain_s fc_chain_t; /* {{{ */
107 struct fc_chain_s
108 {
109 char name[DATA_MAX_NAME_LEN];
110 fc_rule_t *rules;
111 fc_target_t *targets;
112 fc_chain_t *next;
113 }; /* }}} */
115 /*
116 * Global variables
117 */
118 static fc_match_t *match_list_head;
119 static fc_target_t *target_list_head;
120 static fc_chain_t *chain_list_head;
122 /*
123 * Private functions
124 */
125 static void fc_free_matches (fc_match_t *m) /* {{{ */
126 {
127 if (m == NULL)
128 return;
130 if (m->proc.destroy != NULL)
131 (*m->proc.destroy) (&m->user_data);
132 else if (m->user_data != NULL)
133 {
134 ERROR ("Filter sybsystem: fc_free_matches: There is user data, but no "
135 "destroy functions has been specified. "
136 "Memory will probably be lost!");
137 }
139 if (m->next != NULL)
140 fc_free_matches (m->next);
142 free (m);
143 } /* }}} void fc_free_matches */
145 static void fc_free_targets (fc_target_t *t) /* {{{ */
146 {
147 if (t == NULL)
148 return;
150 if (t->proc.destroy != NULL)
151 (*t->proc.destroy) (&t->user_data);
152 else if (t->user_data != NULL)
153 {
154 ERROR ("Filter sybsystem: fc_free_targets: There is user data, but no "
155 "destroy functions has been specified. "
156 "Memory will probably be lost!");
157 }
159 if (t->next != NULL)
160 fc_free_targets (t->next);
162 free (t);
163 } /* }}} void fc_free_targets */
165 static void fc_free_rules (fc_rule_t *r) /* {{{ */
166 {
167 if (r == NULL)
168 return;
170 fc_free_matches (r->matches);
171 fc_free_targets (r->targets);
173 if (r->next != NULL)
174 fc_free_rules (r->next);
176 free (r);
177 } /* }}} void fc_free_rules */
179 static void fc_free_chains (fc_chain_t *c) /* {{{ */
180 {
181 if (c == NULL)
182 return;
184 fc_free_rules (c->rules);
185 fc_free_targets (c->targets);
187 if (c->next != NULL)
188 fc_free_chains (c->next);
190 free (c);
191 } /* }}} void fc_free_chains */
193 static char *fc_strdup (const char *orig) /* {{{ */
194 {
195 size_t sz;
196 char *dest;
198 if (orig == NULL)
199 return (NULL);
201 sz = strlen (orig) + 1;
202 dest = (char *) malloc (sz);
203 if (dest == NULL)
204 return (NULL);
206 memcpy (dest, orig, sz);
208 return (dest);
209 } /* }}} char *fc_strdup */
211 /*
212 * Configuration.
213 *
214 * The configuration looks somewhat like this:
215 *
216 * <Chain "main">
217 * <Rule>
218 * <Match "regex">
219 * Plugin "^mysql$"
220 * Type "^mysql_command$"
221 * TypeInstance "^show_"
222 * </Match>
223 * <Target "drop">
224 * </Target>
225 * </Rule>
226 *
227 * <Target "write">
228 * Plugin "rrdtool"
229 * </Target>
230 * </Chain>
231 */
232 static int fc_config_add_match (fc_match_t **matches_head, /* {{{ */
233 oconfig_item_t *ci)
234 {
235 fc_match_t *m;
236 fc_match_t *ptr;
237 int status;
239 if ((ci->values_num != 1)
240 || (ci->values[0].type != OCONFIG_TYPE_STRING))
241 {
242 WARNING ("Filter subsystem: `Match' blocks require "
243 "exactly one string argument.");
244 return (-1);
245 }
247 ptr = match_list_head;
248 while (ptr != NULL)
249 {
250 if (strcasecmp (ptr->name, ci->values[0].value.string) == 0)
251 break;
252 ptr = ptr->next;
253 }
255 if (ptr == NULL)
256 {
257 WARNING ("Filter subsystem: Cannot find a \"%s\" match. "
258 "Did you load the appropriate plugin?",
259 ci->values[0].value.string);
260 return (-1);
261 }
263 m = (fc_match_t *) malloc (sizeof (*m));
264 if (m == NULL)
265 {
266 ERROR ("fc_config_add_match: malloc failed.");
267 return (-1);
268 }
269 memset (m, 0, sizeof (*m));
271 sstrncpy (m->name, ptr->name, sizeof (m->name));
272 memcpy (&m->proc, &ptr->proc, sizeof (m->proc));
273 assert (m->proc.create != NULL);
274 m->user_data = NULL;
275 m->next = NULL;
277 status = (*m->proc.create) (ci, &m->user_data);
278 if (status != 0)
279 {
280 WARNING ("Filter subsystem: Failed to create a %s match.",
281 m->name);
282 fc_free_matches (m);
283 return (-1);
284 }
286 if (*matches_head != NULL)
287 {
288 ptr = *matches_head;
289 while (ptr->next != NULL)
290 ptr = ptr->next;
292 ptr->next = m;
293 }
294 else
295 {
296 *matches_head = m;
297 }
299 return (0);
300 } /* }}} int fc_config_add_match */
302 static int fc_config_add_target (fc_target_t **targets_head, /* {{{ */
303 oconfig_item_t *ci)
304 {
305 fc_target_t *t;
306 fc_target_t *ptr;
307 int status;
309 if ((ci->values_num != 1)
310 || (ci->values[0].type != OCONFIG_TYPE_STRING))
311 {
312 WARNING ("Filter subsystem: `Target' blocks require "
313 "exactly one string argument.");
314 return (-1);
315 }
317 ptr = target_list_head;
318 while (ptr != NULL)
319 {
320 if (strcasecmp (ptr->name, ci->values[0].value.string) == 0)
321 break;
322 ptr = ptr->next;
323 }
325 if (ptr == NULL)
326 {
327 WARNING ("Filter subsystem: Cannot find a \"%s\" target. "
328 "Did you load the appropriate plugin?",
329 ci->values[0].value.string);
330 return (-1);
331 }
333 t = (fc_target_t *) malloc (sizeof (*t));
334 if (t == NULL)
335 {
336 ERROR ("fc_config_add_match: malloc failed.");
337 return (-1);
338 }
339 memset (t, 0, sizeof (*t));
341 sstrncpy (t->name, ptr->name, sizeof (t->name));
342 memcpy (&t->proc, &ptr->proc, sizeof (t->proc));
343 t->user_data = NULL;
344 t->next = NULL;
346 if (t->proc.create != NULL)
347 {
348 status = (*t->proc.create) (ci, &t->user_data);
349 if (status != 0)
350 {
351 WARNING ("Filter subsystem: Failed to create a %s match.",
352 t->name);
353 fc_free_targets (t);
354 return (-1);
355 }
356 }
357 else
358 {
359 t->user_data = NULL;
360 }
362 if (*targets_head != NULL)
363 {
364 ptr = *targets_head;
365 while (ptr->next != NULL)
366 ptr = ptr->next;
368 ptr->next = t;
369 }
370 else
371 {
372 *targets_head = t;
373 }
375 return (0);
376 } /* }}} int fc_config_add_target */
378 static int fc_config_add_rule (fc_chain_t *chain, /* {{{ */
379 oconfig_item_t *ci)
380 {
381 fc_rule_t *rule;
382 char rule_name[2*DATA_MAX_NAME_LEN] = "Unnamed rule";
383 int status = 0;
384 int i;
386 if (ci->values_num > 1)
387 {
388 WARNING ("Filter subsystem: `Rule' blocks have at most one argument.");
389 return (-1);
390 }
391 else if ((ci->values_num == 1)
392 && (ci->values[0].type != OCONFIG_TYPE_STRING))
393 {
394 WARNING ("Filter subsystem: `Rule' blocks expect one string argument "
395 "or no argument at all.");
396 return (-1);
397 }
399 rule = (fc_rule_t *) malloc (sizeof (*rule));
400 if (rule == NULL)
401 {
402 ERROR ("fc_config_add_rule: malloc failed.");
403 return (-1);
404 }
405 memset (rule, 0, sizeof (*rule));
406 rule->next = NULL;
408 if (ci->values_num == 1)
409 {
410 sstrncpy (rule->name, ci->values[0].value.string, sizeof (rule->name));
411 ssnprintf (rule_name, sizeof (rule_name), "Rule \"%s\"",
412 ci->values[0].value.string);
413 }
415 for (i = 0; i < ci->children_num; i++)
416 {
417 oconfig_item_t *option = ci->children + i;
418 status = 0;
420 if (strcasecmp ("Match", option->key) == 0)
421 status = fc_config_add_match (&rule->matches, option);
422 else if (strcasecmp ("Target", option->key) == 0)
423 status = fc_config_add_target (&rule->targets, option);
424 else
425 {
426 WARNING ("Filter subsystem: %s: Option `%s' not allowed "
427 "inside a <Rule> block.", rule_name, option->key);
428 status = -1;
429 }
431 if (status != 0)
432 break;
433 } /* for (ci->children) */
435 /* Additional sanity checking. */
436 while (status == 0)
437 {
438 if (rule->targets == NULL)
439 {
440 WARNING ("Filter subsystem: %s: No target has been specified.",
441 rule_name);
442 status = -1;
443 break;
444 }
446 break;
447 } /* while (status == 0) */
449 if (status != 0)
450 {
451 fc_free_rules (rule);
452 return (-1);
453 }
455 if (chain->rules != NULL)
456 {
457 fc_rule_t *ptr;
459 ptr = chain->rules;
460 while (ptr->next != NULL)
461 ptr = ptr->next;
463 ptr->next = rule;
464 }
465 else
466 {
467 chain->rules = rule;
468 }
470 return (0);
471 } /* }}} int fc_config_add_rule */
473 static int fc_config_add_chain (const oconfig_item_t *ci) /* {{{ */
474 {
475 fc_chain_t *chain;
476 int status = 0;
477 int i;
479 if ((ci->values_num != 1)
480 || (ci->values[0].type != OCONFIG_TYPE_STRING))
481 {
482 WARNING ("Filter subsystem: <Chain> blocks require exactly one "
483 "string argument.");
484 return (-1);
485 }
487 chain = (fc_chain_t *) malloc (sizeof (*chain));
488 if (chain == NULL)
489 {
490 ERROR ("fc_config_add_chain: malloc failed.");
491 return (-1);
492 }
493 memset (chain, 0, sizeof (*chain));
494 sstrncpy (chain->name, ci->values[0].value.string, sizeof (chain->name));
495 chain->rules = NULL;
496 chain->targets = NULL;
497 chain->next = NULL;
499 for (i = 0; i < ci->children_num; i++)
500 {
501 oconfig_item_t *option = ci->children + i;
502 status = 0;
504 if (strcasecmp ("Rule", option->key) == 0)
505 status = fc_config_add_rule (chain, option);
506 else if (strcasecmp ("Target", option->key) == 0)
507 status = fc_config_add_target (&chain->targets, option);
508 else
509 {
510 WARNING ("Filter subsystem: Chain %s: Option `%s' not allowed "
511 "inside a <Chain> block.", chain->name, option->key);
512 status = -1;
513 }
515 if (status != 0)
516 break;
517 } /* for (ci->children) */
519 /* Additional sanity checking. */
520 while (status == 0)
521 {
522 if (chain->targets == NULL)
523 {
524 WARNING ("Filter subsystem: Chain %s: No default target has been "
525 "specified. Please make sure that there is a <Target> block within "
526 "the <Chain> block!", chain->name);
527 status = -1;
528 break;
529 }
531 break;
532 } /* while (status == 0) */
534 if (status != 0)
535 {
536 fc_free_chains (chain);
537 return (-1);
538 }
540 if (chain_list_head != NULL)
541 {
542 fc_chain_t *ptr;
544 ptr = chain_list_head;
545 while (ptr->next != NULL)
546 ptr = ptr->next;
548 ptr->next = chain;
549 }
550 else
551 {
552 chain_list_head = chain;
553 }
555 return (0);
556 } /* }}} int fc_config_add_chain */
558 int fc_process_chain (const data_set_t *ds, value_list_t *vl, /* {{{ */
559 fc_chain_t *chain)
560 {
561 fc_rule_t *rule;
562 fc_target_t *target;
563 int status;
565 if (chain == NULL)
566 return (-1);
568 DEBUG ("fc_process_chain (chain = %s);", chain->name);
570 status = FC_ACTION_CONTINUE;
572 for (rule = chain->rules; rule != NULL; rule = rule->next)
573 {
574 fc_match_t *match;
576 if (rule->name[0] != 0)
577 {
578 DEBUG ("fc_process_chain (%s): Testing the `%s' rule.",
579 chain->name, rule->name);
580 }
582 /* N. B.: rule->matches may be NULL. */
583 for (match = rule->matches; match != NULL; match = match->next)
584 {
585 status = (*match->proc.match) (ds, vl, /* meta = */ NULL,
586 &match->user_data);
587 if (status < 0)
588 {
589 WARNING ("fc_process_chain (%s): A match failed.", chain->name);
590 break;
591 }
592 else if (status != FC_MATCH_MATCHES)
593 break;
594 }
596 /* for-loop has been aborted: Either error or no match. */
597 if (match != NULL)
598 continue;
600 if (rule->name[0] != 0)
601 {
602 DEBUG ("fc_process_chain (%s): Rule `%s' matches.",
603 chain->name, rule->name);
604 }
606 for (target = rule->targets; target != NULL; target = target->next)
607 {
608 /* If we get here, all matches have matched the value. Execute the
609 * target. */
610 status = (*target->proc.invoke) (ds, vl, /* meta = */ NULL,
611 &target->user_data);
612 if (status < 0)
613 {
614 WARNING ("fc_process_chain (%s): A target failed.", chain->name);
615 continue;
616 }
617 else if (status == FC_ACTION_CONTINUE)
618 continue;
619 else if (status == FC_ACTION_STOP)
620 break;
621 else
622 {
623 WARNING ("fc_process_chain (%s): Unknown return value "
624 "from target `%s': %i",
625 chain->name, target->name, status);
626 }
627 }
629 if (status == FC_ACTION_STOP)
630 {
631 if (rule->name[0] != 0)
632 {
633 DEBUG ("fc_process_chain (%s): Rule `%s' signaled "
634 "the stop condition.",
635 chain->name, rule->name);
636 }
637 break;
638 }
639 } /* for (rule) */
641 /* for-loop has been aborted: A target returned `FC_ACTION_STOP' */
642 if (rule != NULL)
643 return (0);
645 DEBUG ("fc_process_chain (%s): Executing the default targets.",
646 chain->name);
648 for (target = chain->targets; target != NULL; target = target->next)
649 {
650 /* If we get here, all matches have matched the value. Execute the
651 * target. */
652 status = (*target->proc.invoke) (ds, vl, /* meta = */ NULL,
653 &target->user_data);
654 if (status < 0)
655 {
656 WARNING ("fc_process_chain (%s): The default target failed.",
657 chain->name);
658 }
659 else if (status == FC_ACTION_CONTINUE)
660 continue;
661 else if (status == FC_ACTION_STOP)
662 break;
663 else
664 {
665 WARNING ("fc_process_chain (%s): Unknown return value "
666 "from target `%s': %i",
667 chain->name, target->name, status);
668 }
669 }
671 if (target != NULL)
672 {
673 DEBUG ("fc_process_chain (%s): Default target `%s' signaled "
674 "the stop condition.",
675 chain->name, target->name);
676 }
678 return (0);
679 } /* }}} int fc_process_chain */
681 /*
682 * Built-in target "jump"
683 *
684 * Prefix `bit' like `_b_uilt-_i_n _t_arget'
685 */
686 static int fc_bit_jump_create (const oconfig_item_t *ci, /* {{{ */
687 void **user_data)
688 {
689 oconfig_item_t *ci_chain;
691 if (ci->children_num != 1)
692 {
693 ERROR ("Filter subsystem: The built-in target `jump' needs exactly "
694 "one `Chain' argument!");
695 return (-1);
696 }
698 ci_chain = ci->children;
699 if (strcasecmp ("Chain", ci_chain->key) != 0)
700 {
701 ERROR ("Filter subsystem: The built-in target `jump' does not "
702 "support the configuration option `%s'.",
703 ci_chain->key);
704 return (-1);
705 }
707 if ((ci_chain->values_num != 1)
708 || (ci_chain->values[0].type != OCONFIG_TYPE_STRING))
709 {
710 ERROR ("Filter subsystem: Built-in target `jump': The `Chain' option "
711 "needs exactly one string argument.");
712 return (-1);
713 }
715 *user_data = fc_strdup (ci_chain->values[0].value.string);
716 if (*user_data == NULL)
717 {
718 ERROR ("fc_bit_jump_create: fc_strdup failed.");
719 return (-1);
720 }
722 return (0);
723 } /* }}} int fc_bit_jump_create */
725 static int fc_bit_jump_destroy (void **user_data) /* {{{ */
726 {
727 if (user_data != NULL)
728 {
729 free (*user_data);
730 *user_data = NULL;
731 }
733 return (0);
734 } /* }}} int fc_bit_jump_destroy */
736 static int fc_bit_jump_invoke (const data_set_t *ds, /* {{{ */
737 value_list_t *vl, notification_meta_t **meta, void **user_data)
738 {
739 char *chain_name;
740 fc_chain_t *chain;
741 int status;
743 chain_name = *user_data;
745 for (chain = chain_list_head; chain != NULL; chain = chain->next)
746 if (strcasecmp (chain_name, chain->name) == 0)
747 break;
749 if (chain == NULL)
750 {
751 ERROR ("Filter subsystem: Built-in target `jump': There is no chain "
752 "named `%s'.", chain_name);
753 return (-1);
754 }
756 status = fc_process_chain (ds, vl, chain);
757 if (status < 0)
758 return (status);
760 return (FC_ACTION_CONTINUE);
761 } /* }}} int fc_bit_jump_invoke */
763 static int fc_bit_stop_invoke (const data_set_t *ds, /* {{{ */
764 value_list_t *vl, notification_meta_t **meta, void **user_data)
765 {
766 return (FC_ACTION_STOP);
767 } /* }}} int fc_bit_stop_invoke */
769 static int fc_bit_write_create (const oconfig_item_t *ci, /* {{{ */
770 void **user_data)
771 {
772 int i;
774 char **plugin_list;
775 size_t plugin_list_len;
777 plugin_list = NULL;
778 plugin_list_len = 0;
780 for (i = 0; i < ci->children_num; i++)
781 {
782 oconfig_item_t *child = ci->children + i;
783 char **temp;
784 int j;
786 if (strcasecmp ("Plugin", child->key) != 0)
787 {
788 ERROR ("Filter subsystem: The built-in target `write' does not "
789 "support the configuration option `%s'.",
790 child->key);
791 continue;
792 }
794 for (j = 0; j < child->values_num; j++)
795 {
796 if (child->values[j].type != OCONFIG_TYPE_STRING)
797 {
798 ERROR ("Filter subsystem: Built-in target `write': "
799 "The `Plugin' option accepts only string arguments.");
800 continue;
801 }
803 temp = (char **) realloc (plugin_list, (plugin_list_len + 2)
804 * (sizeof (*plugin_list)));
805 if (temp == NULL)
806 {
807 ERROR ("fc_bit_write_create: realloc failed.");
808 continue;
809 }
810 plugin_list = temp;
812 plugin_list[plugin_list_len] = fc_strdup (child->values[j].value.string);
813 if (plugin_list[plugin_list_len] == NULL)
814 {
815 ERROR ("fc_bit_write_create: fc_strdup failed.");
816 continue;
817 }
818 plugin_list_len++;
819 plugin_list[plugin_list_len] = NULL;
820 } /* for (j = 0; j < child->values_num; j++) */
821 } /* for (i = 0; i < ci->children_num; i++) */
823 *user_data = plugin_list;
825 return (0);
826 } /* }}} int fc_bit_write_create */
828 static int fc_bit_write_destroy (void **user_data) /* {{{ */
829 {
830 char **plugin_list;
831 size_t i;
833 if ((user_data == NULL) || (*user_data == NULL))
834 return (0);
836 plugin_list = *user_data;
838 for (i = 0; plugin_list[i] != NULL; i++)
839 free (plugin_list[i]);
840 free (plugin_list);
842 return (0);
843 } /* }}} int fc_bit_write_destroy */
845 static int fc_bit_write_invoke (const data_set_t *ds, /* {{{ */
846 value_list_t *vl, notification_meta_t **meta, void **user_data)
847 {
848 char **plugin_list;
849 int status;
851 plugin_list = NULL;
852 if (user_data != NULL)
853 plugin_list = *user_data;
855 if ((plugin_list == NULL) || (plugin_list[0] == NULL))
856 {
857 status = plugin_write (/* plugin = */ NULL, ds, vl);
858 if (status != 0)
859 {
860 INFO ("Filter subsystem: Built-in target `write': Dispatching value to "
861 "all write plugins failed with status %i.", status);
862 }
863 }
864 else
865 {
866 size_t i;
868 for (i = 0; plugin_list[i] != NULL; i++)
869 {
870 status = plugin_write (plugin_list[i], ds, vl);
871 if (status != 0)
872 {
873 INFO ("Filter subsystem: Built-in target `write': Dispatching value to "
874 "the `%s' plugin failed with status %i.", plugin_list[i], status);
875 }
876 } /* for (i = 0; plugin_list[i] != NULL; i++) */
877 }
879 return (FC_ACTION_CONTINUE);
880 } /* }}} int fc_bit_write_invoke */
882 static int fc_init_once (void) /* {{{ */
883 {
884 static int done = 0;
885 target_proc_t tproc;
887 if (done != 0)
888 return (0);
890 memset (&tproc, 0, sizeof (tproc));
891 tproc.create = fc_bit_jump_create;
892 tproc.destroy = fc_bit_jump_destroy;
893 tproc.invoke = fc_bit_jump_invoke;
894 fc_register_target ("jump", tproc);
896 memset (&tproc, 0, sizeof (tproc));
897 tproc.create = NULL;
898 tproc.destroy = NULL;
899 tproc.invoke = fc_bit_stop_invoke;
900 fc_register_target ("stop", tproc);
902 memset (&tproc, 0, sizeof (tproc));
903 tproc.create = fc_bit_write_create;
904 tproc.destroy = fc_bit_write_destroy;
905 tproc.invoke = fc_bit_write_invoke;
906 fc_register_target ("write", tproc);
908 done++;
909 return (0);
910 } /* }}} int fc_init_once */
912 /*
913 * Public functions
914 */
915 /* Add a match to list of available matches. */
916 int fc_register_match (const char *name, match_proc_t proc) /* {{{ */
917 {
918 fc_match_t *m;
920 DEBUG ("fc_register_match (%s);", name);
922 m = (fc_match_t *) malloc (sizeof (*m));
923 if (m == NULL)
924 return (-ENOMEM);
925 memset (m, 0, sizeof (*m));
927 sstrncpy (m->name, name, sizeof (m->name));
928 memcpy (&m->proc, &proc, sizeof (m->proc));
929 m->next = NULL;
931 if (match_list_head == NULL)
932 {
933 match_list_head = m;
934 }
935 else
936 {
937 fc_match_t *ptr;
939 ptr = match_list_head;
940 while (ptr->next != NULL)
941 ptr = ptr->next;
943 ptr->next = m;
944 }
946 return (0);
947 } /* }}} int fc_register_match */
949 /* Add a target to list of available targets. */
950 int fc_register_target (const char *name, target_proc_t proc) /* {{{ */
951 {
952 fc_target_t *t;
954 DEBUG ("fc_register_target (%s);", name);
956 t = (fc_target_t *) malloc (sizeof (*t));
957 if (t == NULL)
958 return (-ENOMEM);
959 memset (t, 0, sizeof (*t));
961 sstrncpy (t->name, name, sizeof (t->name));
962 memcpy (&t->proc, &proc, sizeof (t->proc));
963 t->next = NULL;
965 if (target_list_head == NULL)
966 {
967 target_list_head = t;
968 }
969 else
970 {
971 fc_target_t *ptr;
973 ptr = target_list_head;
974 while (ptr->next != NULL)
975 ptr = ptr->next;
977 ptr->next = t;
978 }
980 return (0);
981 } /* }}} int fc_register_target */
983 /* Iterate over all rules in the chain and execute all targets for which all
984 * matches match. */
985 int fc_process (const data_set_t *ds, value_list_t *vl) /* {{{ */
986 {
987 fc_chain_t *chain;
989 for (chain = chain_list_head; chain != NULL; chain = chain->next)
990 if (strcasecmp ("Main", chain->name) == 0)
991 break;
993 if (chain != NULL)
994 return (fc_process_chain (ds, vl, chain));
996 return (fc_bit_write_invoke (ds, vl,
997 /* meta = */ NULL, /* user_data = */ NULL));
998 } /* }}} int fc_process */
1000 int fc_configure (const oconfig_item_t *ci) /* {{{ */
1001 {
1002 fc_init_once ();
1004 if (ci == NULL)
1005 return (-EINVAL);
1007 if (strcasecmp ("Chain", ci->key) == 0)
1008 return (fc_config_add_chain (ci));
1010 WARNING ("Filter subsystem: Unknown top level config option `%s'.",
1011 ci->key);
1013 return (-1);
1014 } /* }}} int fc_configure */
1016 /* vim: set sw=2 sts=2 et fdm=marker : */