1 /**
2 * collectd - src/configfile.c
3 * Copyright (C) 2005-2011 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; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian octo Forster <octo at collectd.org>
21 * Sebastian tokkee Harl <sh at tokkee.org>
22 **/
24 #include "collectd.h"
26 #include "liboconfig/oconfig.h"
28 #include "common.h"
29 #include "plugin.h"
30 #include "configfile.h"
31 #include "types_list.h"
32 #include "filter_chain.h"
34 #if HAVE_WORDEXP_H
35 # include <wordexp.h>
36 #endif /* HAVE_WORDEXP_H */
38 #define ESCAPE_NULL(str) ((str) == NULL ? "(null)" : (str))
40 /*
41 * Private types
42 */
43 typedef struct cf_callback
44 {
45 const char *type;
46 int (*callback) (const char *, const char *);
47 const char **keys;
48 int keys_num;
49 struct cf_callback *next;
50 } cf_callback_t;
52 typedef struct cf_complex_callback_s
53 {
54 char *type;
55 int (*callback) (oconfig_item_t *);
56 struct cf_complex_callback_s *next;
57 } cf_complex_callback_t;
59 typedef struct cf_value_map_s
60 {
61 char *key;
62 int (*func) (const oconfig_item_t *);
63 } cf_value_map_t;
65 typedef struct cf_global_option_s
66 {
67 char *key;
68 char *value;
69 char *def;
70 } cf_global_option_t;
72 /*
73 * Prototypes of callback functions
74 */
75 static int dispatch_value_typesdb (const oconfig_item_t *ci);
76 static int dispatch_value_plugindir (const oconfig_item_t *ci);
77 static int dispatch_loadplugin (const oconfig_item_t *ci);
79 /*
80 * Private variables
81 */
82 static cf_callback_t *first_callback = NULL;
83 static cf_complex_callback_t *complex_callback_head = NULL;
85 static cf_value_map_t cf_value_map[] =
86 {
87 {"TypesDB", dispatch_value_typesdb},
88 {"PluginDir", dispatch_value_plugindir},
89 {"LoadPlugin", dispatch_loadplugin}
90 };
91 static int cf_value_map_num = STATIC_ARRAY_LEN (cf_value_map);
93 static cf_global_option_t cf_global_options[] =
94 {
95 {"BaseDir", NULL, PKGLOCALSTATEDIR},
96 {"PIDFile", NULL, PIDFILE},
97 {"Hostname", NULL, NULL},
98 {"FQDNLookup", NULL, "true"},
99 {"Interval", NULL, "10"},
100 {"ReadThreads", NULL, "5"},
101 {"Timeout", NULL, "2"},
102 {"PreCacheChain", NULL, "PreCache"},
103 {"PostCacheChain", NULL, "PostCache"}
104 };
105 static int cf_global_options_num = STATIC_ARRAY_LEN (cf_global_options);
107 static int cf_default_typesdb = 1;
109 /*
110 * Functions to handle register/unregister, search, and other plugin related
111 * stuff
112 */
113 static cf_callback_t *cf_search (const char *type)
114 {
115 cf_callback_t *cf_cb;
117 if (type == NULL)
118 return (NULL);
120 for (cf_cb = first_callback; cf_cb != NULL; cf_cb = cf_cb->next)
121 if (strcasecmp (cf_cb->type, type) == 0)
122 break;
124 return (cf_cb);
125 }
127 static int cf_dispatch (const char *type, const char *orig_key,
128 const char *orig_value)
129 {
130 cf_callback_t *cf_cb;
131 char *key;
132 char *value;
133 int ret;
134 int i;
136 DEBUG ("type = %s, key = %s, value = %s",
137 ESCAPE_NULL(type),
138 ESCAPE_NULL(orig_key),
139 ESCAPE_NULL(orig_value));
141 if ((cf_cb = cf_search (type)) == NULL)
142 {
143 WARNING ("Found a configuration for the `%s' plugin, but "
144 "the plugin isn't loaded or didn't register "
145 "a configuration callback.", type);
146 return (-1);
147 }
149 if ((key = strdup (orig_key)) == NULL)
150 return (1);
151 if ((value = strdup (orig_value)) == NULL)
152 {
153 free (key);
154 return (2);
155 }
157 ret = -1;
159 for (i = 0; i < cf_cb->keys_num; i++)
160 {
161 if ((cf_cb->keys[i] != NULL)
162 && (strcasecmp (cf_cb->keys[i], key) == 0))
163 {
164 ret = (*cf_cb->callback) (key, value);
165 break;
166 }
167 }
169 if (i >= cf_cb->keys_num)
170 WARNING ("Plugin `%s' did not register for value `%s'.", type, key);
172 free (key);
173 free (value);
175 DEBUG ("cf_dispatch: return (%i)", ret);
177 return (ret);
178 } /* int cf_dispatch */
180 static int dispatch_global_option (const oconfig_item_t *ci)
181 {
182 if (ci->values_num != 1)
183 return (-1);
184 if (ci->values[0].type == OCONFIG_TYPE_STRING)
185 return (global_option_set (ci->key, ci->values[0].value.string));
186 else if (ci->values[0].type == OCONFIG_TYPE_NUMBER)
187 {
188 char tmp[128];
189 ssnprintf (tmp, sizeof (tmp), "%lf", ci->values[0].value.number);
190 return (global_option_set (ci->key, tmp));
191 }
192 else if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
193 {
194 if (ci->values[0].value.boolean)
195 return (global_option_set (ci->key, "true"));
196 else
197 return (global_option_set (ci->key, "false"));
198 }
200 return (-1);
201 } /* int dispatch_global_option */
203 static int dispatch_value_typesdb (const oconfig_item_t *ci)
204 {
205 int i = 0;
207 assert (strcasecmp (ci->key, "TypesDB") == 0);
209 cf_default_typesdb = 0;
211 if (ci->values_num < 1) {
212 ERROR ("configfile: `TypesDB' needs at least one argument.");
213 return (-1);
214 }
216 for (i = 0; i < ci->values_num; ++i)
217 {
218 if (OCONFIG_TYPE_STRING != ci->values[i].type) {
219 WARNING ("configfile: TypesDB: Skipping %i. argument which "
220 "is not a string.", i + 1);
221 continue;
222 }
224 read_types_list (ci->values[i].value.string);
225 }
226 return (0);
227 } /* int dispatch_value_typesdb */
229 static int dispatch_value_plugindir (const oconfig_item_t *ci)
230 {
231 assert (strcasecmp (ci->key, "PluginDir") == 0);
233 if (ci->values_num != 1)
234 return (-1);
235 if (ci->values[0].type != OCONFIG_TYPE_STRING)
236 return (-1);
238 plugin_set_dir (ci->values[0].value.string);
239 return (0);
240 }
242 static int dispatch_loadplugin (const oconfig_item_t *ci)
243 {
244 int i;
245 const char *name;
246 unsigned int flags = 0;
247 assert (strcasecmp (ci->key, "LoadPlugin") == 0);
249 if (ci->values_num != 1)
250 return (-1);
251 if (ci->values[0].type != OCONFIG_TYPE_STRING)
252 return (-1);
254 name = ci->values[0].value.string;
256 /*
257 * XXX: Magic at work:
258 *
259 * Some of the language bindings, for example the Python and Perl
260 * plugins, need to be able to export symbols to the scripts they run.
261 * For this to happen, the "Globals" flag needs to be set.
262 * Unfortunately, this technical detail is hard to explain to the
263 * average user and she shouldn't have to worry about this, ideally.
264 * So in order to save everyone's sanity use a different default for a
265 * handful of special plugins. --octo
266 */
267 if ((strcasecmp ("Perl", name) == 0)
268 || (strcasecmp ("Python", name) == 0))
269 flags |= PLUGIN_FLAGS_GLOBAL;
271 for (i = 0; i < ci->children_num; ++i) {
272 if (strcasecmp("Globals", ci->children[i].key) == 0)
273 cf_util_get_flag (ci->children + i, &flags, PLUGIN_FLAGS_GLOBAL);
274 else {
275 WARNING("Ignoring unknown LoadPlugin option \"%s\" "
276 "for plugin \"%s\"",
277 ci->children[i].key, ci->values[0].value.string);
278 }
279 }
281 return (plugin_load (name, (uint32_t) flags));
282 } /* int dispatch_value_loadplugin */
284 static int dispatch_value_plugin (const char *plugin, oconfig_item_t *ci)
285 {
286 char buffer[4096];
287 char *buffer_ptr;
288 int buffer_free;
289 int i;
291 buffer_ptr = buffer;
292 buffer_free = sizeof (buffer);
294 for (i = 0; i < ci->values_num; i++)
295 {
296 int status = -1;
298 if (ci->values[i].type == OCONFIG_TYPE_STRING)
299 status = ssnprintf (buffer_ptr, buffer_free, " %s",
300 ci->values[i].value.string);
301 else if (ci->values[i].type == OCONFIG_TYPE_NUMBER)
302 status = ssnprintf (buffer_ptr, buffer_free, " %lf",
303 ci->values[i].value.number);
304 else if (ci->values[i].type == OCONFIG_TYPE_BOOLEAN)
305 status = ssnprintf (buffer_ptr, buffer_free, " %s",
306 ci->values[i].value.boolean
307 ? "true" : "false");
309 if ((status < 0) || (status >= buffer_free))
310 return (-1);
311 buffer_free -= status;
312 buffer_ptr += status;
313 }
314 /* skip the initial space */
315 buffer_ptr = buffer + 1;
317 return (cf_dispatch (plugin, ci->key, buffer_ptr));
318 } /* int dispatch_value_plugin */
320 static int dispatch_value (const oconfig_item_t *ci)
321 {
322 int ret = -2;
323 int i;
325 for (i = 0; i < cf_value_map_num; i++)
326 if (strcasecmp (cf_value_map[i].key, ci->key) == 0)
327 {
328 ret = cf_value_map[i].func (ci);
329 break;
330 }
332 for (i = 0; i < cf_global_options_num; i++)
333 if (strcasecmp (cf_global_options[i].key, ci->key) == 0)
334 {
335 ret = dispatch_global_option (ci);
336 break;
337 }
339 return (ret);
340 } /* int dispatch_value */
342 static int dispatch_block_plugin (oconfig_item_t *ci)
343 {
344 int i;
345 char *name;
347 cf_complex_callback_t *cb;
349 if (strcasecmp (ci->key, "Plugin") != 0)
350 return (-1);
351 if (ci->values_num < 1)
352 return (-1);
353 if (ci->values[0].type != OCONFIG_TYPE_STRING)
354 return (-1);
356 name = ci->values[0].value.string;
358 /* Check for a complex callback first */
359 for (cb = complex_callback_head; cb != NULL; cb = cb->next)
360 if (strcasecmp (name, cb->type) == 0)
361 return (cb->callback (ci));
363 /* Hm, no complex plugin found. Dispatch the values one by one */
364 for (i = 0; i < ci->children_num; i++)
365 {
366 if (ci->children[i].children == NULL)
367 dispatch_value_plugin (name, ci->children + i);
368 else
369 {
370 WARNING ("There is a `%s' block within the "
371 "configuration for the %s plugin. "
372 "The plugin either only expects "
373 "\"simple\" configuration statements "
374 "or wasn't loaded using `LoadPlugin'."
375 " Please check your configuration.",
376 ci->children[i].key, name);
377 }
378 }
380 return (0);
381 }
384 static int dispatch_block (oconfig_item_t *ci)
385 {
386 if (strcasecmp (ci->key, "LoadPlugin") == 0)
387 return (dispatch_loadplugin (ci));
388 else if (strcasecmp (ci->key, "Plugin") == 0)
389 return (dispatch_block_plugin (ci));
390 else if (strcasecmp (ci->key, "Chain") == 0)
391 return (fc_configure (ci));
393 return (0);
394 }
396 static int cf_ci_replace_child (oconfig_item_t *dst, oconfig_item_t *src,
397 int offset)
398 {
399 oconfig_item_t *temp;
400 int i;
402 assert (offset >= 0);
403 assert (dst->children_num > offset);
405 /* Free the memory used by the replaced child. Usually that's the
406 * `Include "blah"' statement. */
407 temp = dst->children + offset;
408 for (i = 0; i < temp->values_num; i++)
409 {
410 if (temp->values[i].type == OCONFIG_TYPE_STRING)
411 {
412 sfree (temp->values[i].value.string);
413 }
414 }
415 sfree (temp->values);
416 temp = NULL;
418 /* If (src->children_num == 0) the array size is decreased. If offset
419 * is _not_ the last element, (offset < (dst->children_num - 1)), then
420 * we need to move the trailing elements before resizing the array. */
421 if ((src->children_num == 0) && (offset < (dst->children_num - 1)))
422 {
423 int nmemb = dst->children_num - (offset + 1);
424 memmove (dst->children + offset, dst->children + offset + 1,
425 sizeof (oconfig_item_t) * nmemb);
426 }
428 /* Resize the memory containing the children to be big enough to hold
429 * all children. */
430 temp = (oconfig_item_t *) realloc (dst->children,
431 sizeof (oconfig_item_t)
432 * (dst->children_num + src->children_num - 1));
433 if (temp == NULL)
434 {
435 ERROR ("configfile: realloc failed.");
436 return (-1);
437 }
438 dst->children = temp;
440 /* If there are children behind the include statement, and they have
441 * not yet been moved because (src->children_num == 0), then move them
442 * to the end of the list, so that the new children have room before
443 * them. */
444 if ((src->children_num > 0)
445 && ((dst->children_num - (offset + 1)) > 0))
446 {
447 int nmemb = dst->children_num - (offset + 1);
448 int old_offset = offset + 1;
449 int new_offset = offset + src->children_num;
451 memmove (dst->children + new_offset,
452 dst->children + old_offset,
453 sizeof (oconfig_item_t) * nmemb);
454 }
456 /* Last but not least: If there are new children, copy them to the
457 * memory reserved for them. */
458 if (src->children_num > 0)
459 {
460 memcpy (dst->children + offset,
461 src->children,
462 sizeof (oconfig_item_t) * src->children_num);
463 }
465 /* Update the number of children. */
466 dst->children_num += (src->children_num - 1);
468 return (0);
469 } /* int cf_ci_replace_child */
471 static int cf_ci_append_children (oconfig_item_t *dst, oconfig_item_t *src)
472 {
473 oconfig_item_t *temp;
475 if ((src == NULL) || (src->children_num == 0))
476 return (0);
478 temp = (oconfig_item_t *) realloc (dst->children,
479 sizeof (oconfig_item_t)
480 * (dst->children_num + src->children_num));
481 if (temp == NULL)
482 {
483 ERROR ("configfile: realloc failed.");
484 return (-1);
485 }
486 dst->children = temp;
488 memcpy (dst->children + dst->children_num,
489 src->children,
490 sizeof (oconfig_item_t)
491 * src->children_num);
492 dst->children_num += src->children_num;
494 return (0);
495 } /* int cf_ci_append_children */
497 #define CF_MAX_DEPTH 8
498 static oconfig_item_t *cf_read_generic (const char *path, int depth);
500 static int cf_include_all (oconfig_item_t *root, int depth)
501 {
502 int i;
504 for (i = 0; i < root->children_num; i++)
505 {
506 oconfig_item_t *new;
507 oconfig_item_t *old;
509 /* Ignore all blocks, including `Include' blocks. */
510 if (root->children[i].children_num != 0)
511 continue;
513 if (strcasecmp (root->children[i].key, "Include") != 0)
514 continue;
516 old = root->children + i;
518 if ((old->values_num != 1)
519 || (old->values[0].type != OCONFIG_TYPE_STRING))
520 {
521 ERROR ("configfile: `Include' needs exactly one string argument.");
522 continue;
523 }
525 new = cf_read_generic (old->values[0].value.string, depth + 1);
526 if (new == NULL)
527 continue;
529 /* Now replace the i'th child in `root' with `new'. */
530 cf_ci_replace_child (root, new, i);
532 /* ... and go back to the new i'th child. */
533 --i;
535 sfree (new->values);
536 sfree (new);
537 } /* for (i = 0; i < root->children_num; i++) */
539 return (0);
540 } /* int cf_include_all */
542 static oconfig_item_t *cf_read_file (const char *file, int depth)
543 {
544 oconfig_item_t *root;
546 assert (depth < CF_MAX_DEPTH);
548 root = oconfig_parse_file (file);
549 if (root == NULL)
550 {
551 ERROR ("configfile: Cannot read file `%s'.", file);
552 return (NULL);
553 }
555 cf_include_all (root, depth);
557 return (root);
558 } /* oconfig_item_t *cf_read_file */
560 static int cf_compare_string (const void *p1, const void *p2)
561 {
562 return strcmp (*(const char **) p1, *(const char **) p2);
563 }
565 static oconfig_item_t *cf_read_dir (const char *dir, int depth)
566 {
567 oconfig_item_t *root = NULL;
568 DIR *dh;
569 struct dirent *de;
570 char **filenames = NULL;
571 int filenames_num = 0;
572 int status;
573 int i;
575 assert (depth < CF_MAX_DEPTH);
577 dh = opendir (dir);
578 if (dh == NULL)
579 {
580 char errbuf[1024];
581 ERROR ("configfile: opendir failed: %s",
582 sstrerror (errno, errbuf, sizeof (errbuf)));
583 return (NULL);
584 }
586 root = (oconfig_item_t *) malloc (sizeof (oconfig_item_t));
587 if (root == NULL)
588 {
589 ERROR ("configfile: malloc failed.");
590 return (NULL);
591 }
592 memset (root, 0, sizeof (oconfig_item_t));
594 while ((de = readdir (dh)) != NULL)
595 {
596 char name[1024];
597 char **tmp;
599 if ((de->d_name[0] == '.') || (de->d_name[0] == 0))
600 continue;
602 status = ssnprintf (name, sizeof (name), "%s/%s",
603 dir, de->d_name);
604 if ((status < 0) || ((size_t) status >= sizeof (name)))
605 {
606 ERROR ("configfile: Not including `%s/%s' because its"
607 " name is too long.",
608 dir, de->d_name);
609 for (i = 0; i < filenames_num; ++i)
610 free (filenames[i]);
611 free (filenames);
612 free (root);
613 return (NULL);
614 }
616 ++filenames_num;
617 tmp = (char **) realloc (filenames,
618 filenames_num * sizeof (*filenames));
619 if (tmp == NULL) {
620 ERROR ("configfile: realloc failed.");
621 for (i = 0; i < filenames_num - 1; ++i)
622 free (filenames[i]);
623 free (filenames);
624 free (root);
625 return (NULL);
626 }
627 filenames = tmp;
629 filenames[filenames_num - 1] = sstrdup (name);
630 }
632 qsort ((void *) filenames, filenames_num, sizeof (*filenames),
633 cf_compare_string);
635 for (i = 0; i < filenames_num; ++i)
636 {
637 oconfig_item_t *temp;
638 char *name = filenames[i];
640 temp = cf_read_generic (name, depth);
641 if (temp == NULL)
642 {
643 /* An error should already have been reported. */
644 sfree (name);
645 continue;
646 }
648 cf_ci_append_children (root, temp);
649 sfree (temp->children);
650 sfree (temp);
652 free (name);
653 }
655 free(filenames);
656 return (root);
657 } /* oconfig_item_t *cf_read_dir */
659 /*
660 * cf_read_generic
661 *
662 * Path is stat'ed and either cf_read_file or cf_read_dir is called
663 * accordingly.
664 *
665 * There are two versions of this function: If `wordexp' exists shell wildcards
666 * will be expanded and the function will include all matches found. If
667 * `wordexp' (or, more precisely, it's header file) is not available the
668 * simpler function is used which does not do any such expansion.
669 */
670 #if HAVE_WORDEXP_H
671 static oconfig_item_t *cf_read_generic (const char *path, int depth)
672 {
673 oconfig_item_t *root = NULL;
674 int status;
675 const char *path_ptr;
676 wordexp_t we;
677 size_t i;
679 if (depth >= CF_MAX_DEPTH)
680 {
681 ERROR ("configfile: Not including `%s' because the maximum "
682 "nesting depth has been reached.", path);
683 return (NULL);
684 }
686 status = wordexp (path, &we, WRDE_NOCMD);
687 if (status != 0)
688 {
689 ERROR ("configfile: wordexp (%s) failed.", path);
690 return (NULL);
691 }
693 root = (oconfig_item_t *) malloc (sizeof (oconfig_item_t));
694 if (root == NULL)
695 {
696 ERROR ("configfile: malloc failed.");
697 return (NULL);
698 }
699 memset (root, '\0', sizeof (oconfig_item_t));
701 /* wordexp() might return a sorted list already. That's not
702 * documented though, so let's make sure we get what we want. */
703 qsort ((void *) we.we_wordv, we.we_wordc, sizeof (*we.we_wordv),
704 cf_compare_string);
706 for (i = 0; i < we.we_wordc; i++)
707 {
708 oconfig_item_t *temp;
709 struct stat statbuf;
711 path_ptr = we.we_wordv[i];
713 status = stat (path_ptr, &statbuf);
714 if (status != 0)
715 {
716 char errbuf[1024];
717 WARNING ("configfile: stat (%s) failed: %s",
718 path_ptr,
719 sstrerror (errno, errbuf, sizeof (errbuf)));
720 continue;
721 }
723 if (S_ISREG (statbuf.st_mode))
724 temp = cf_read_file (path_ptr, depth);
725 else if (S_ISDIR (statbuf.st_mode))
726 temp = cf_read_dir (path_ptr, depth);
727 else
728 {
729 WARNING ("configfile: %s is neither a file nor a "
730 "directory.", path);
731 continue;
732 }
734 if (temp == NULL) {
735 oconfig_free (root);
736 return (NULL);
737 }
739 cf_ci_append_children (root, temp);
740 sfree (temp->children);
741 sfree (temp);
742 }
744 wordfree (&we);
746 if (root->children == NULL)
747 {
748 oconfig_free (root);
749 return (NULL);
750 }
752 return (root);
753 } /* oconfig_item_t *cf_read_generic */
754 /* #endif HAVE_WORDEXP_H */
756 #else /* if !HAVE_WORDEXP_H */
757 static oconfig_item_t *cf_read_generic (const char *path, int depth)
758 {
759 struct stat statbuf;
760 int status;
762 if (depth >= CF_MAX_DEPTH)
763 {
764 ERROR ("configfile: Not including `%s' because the maximum "
765 "nesting depth has been reached.", path);
766 return (NULL);
767 }
769 status = stat (path, &statbuf);
770 if (status != 0)
771 {
772 char errbuf[1024];
773 ERROR ("configfile: stat (%s) failed: %s",
774 path,
775 sstrerror (errno, errbuf, sizeof (errbuf)));
776 return (NULL);
777 }
779 if (S_ISREG (statbuf.st_mode))
780 return (cf_read_file (path, depth));
781 else if (S_ISDIR (statbuf.st_mode))
782 return (cf_read_dir (path, depth));
784 ERROR ("configfile: %s is neither a file nor a directory.", path);
785 return (NULL);
786 } /* oconfig_item_t *cf_read_generic */
787 #endif /* !HAVE_WORDEXP_H */
789 /*
790 * Public functions
791 */
792 int global_option_set (const char *option, const char *value)
793 {
794 int i;
796 DEBUG ("option = %s; value = %s;", option, value);
798 for (i = 0; i < cf_global_options_num; i++)
799 if (strcasecmp (cf_global_options[i].key, option) == 0)
800 break;
802 if (i >= cf_global_options_num)
803 return (-1);
805 sfree (cf_global_options[i].value);
807 if (value != NULL)
808 cf_global_options[i].value = strdup (value);
809 else
810 cf_global_options[i].value = NULL;
812 return (0);
813 }
815 const char *global_option_get (const char *option)
816 {
817 int i;
819 for (i = 0; i < cf_global_options_num; i++)
820 if (strcasecmp (cf_global_options[i].key, option) == 0)
821 break;
823 if (i >= cf_global_options_num)
824 return (NULL);
826 return ((cf_global_options[i].value != NULL)
827 ? cf_global_options[i].value
828 : cf_global_options[i].def);
829 } /* char *global_option_get */
831 void cf_unregister (const char *type)
832 {
833 cf_callback_t *this, *prev;
835 for (prev = NULL, this = first_callback;
836 this != NULL;
837 prev = this, this = this->next)
838 if (strcasecmp (this->type, type) == 0)
839 {
840 if (prev == NULL)
841 first_callback = this->next;
842 else
843 prev->next = this->next;
845 free (this);
846 break;
847 }
848 } /* void cf_unregister */
850 void cf_unregister_complex (const char *type)
851 {
852 cf_complex_callback_t *this, *prev;
854 for (prev = NULL, this = complex_callback_head;
855 this != NULL;
856 prev = this, this = this->next)
857 if (strcasecmp (this->type, type) == 0)
858 {
859 if (prev == NULL)
860 complex_callback_head = this->next;
861 else
862 prev->next = this->next;
864 sfree (this->type);
865 sfree (this);
866 break;
867 }
868 } /* void cf_unregister */
870 void cf_register (const char *type,
871 int (*callback) (const char *, const char *),
872 const char **keys, int keys_num)
873 {
874 cf_callback_t *cf_cb;
876 /* Remove this module from the list, if it already exists */
877 cf_unregister (type);
879 /* This pointer will be free'd in `cf_unregister' */
880 if ((cf_cb = (cf_callback_t *) malloc (sizeof (cf_callback_t))) == NULL)
881 return;
883 cf_cb->type = type;
884 cf_cb->callback = callback;
885 cf_cb->keys = keys;
886 cf_cb->keys_num = keys_num;
888 cf_cb->next = first_callback;
889 first_callback = cf_cb;
890 } /* void cf_register */
892 int cf_register_complex (const char *type, int (*callback) (oconfig_item_t *))
893 {
894 cf_complex_callback_t *new;
896 new = (cf_complex_callback_t *) malloc (sizeof (cf_complex_callback_t));
897 if (new == NULL)
898 return (-1);
900 new->type = strdup (type);
901 if (new->type == NULL)
902 {
903 sfree (new);
904 return (-1);
905 }
907 new->callback = callback;
908 new->next = NULL;
910 if (complex_callback_head == NULL)
911 {
912 complex_callback_head = new;
913 }
914 else
915 {
916 cf_complex_callback_t *last = complex_callback_head;
917 while (last->next != NULL)
918 last = last->next;
919 last->next = new;
920 }
922 return (0);
923 } /* int cf_register_complex */
925 int cf_read (char *filename)
926 {
927 oconfig_item_t *conf;
928 int i;
930 conf = cf_read_generic (filename, 0 /* depth */);
931 if (conf == NULL)
932 {
933 ERROR ("Unable to read config file %s.", filename);
934 return (-1);
935 }
937 for (i = 0; i < conf->children_num; i++)
938 {
939 if (conf->children[i].children == NULL)
940 dispatch_value (conf->children + i);
941 else
942 dispatch_block (conf->children + i);
943 }
945 oconfig_free (conf);
947 /* Read the default types.db if no `TypesDB' option was given. */
948 if (cf_default_typesdb)
949 read_types_list (PKGDATADIR"/types.db");
951 return (0);
952 } /* int cf_read */
954 /* Assures the config option is a string, duplicates it and returns the copy in
955 * "ret_string". If necessary "*ret_string" is freed first. Returns zero upon
956 * success. */
957 int cf_util_get_string (const oconfig_item_t *ci, char **ret_string) /* {{{ */
958 {
959 char *string;
961 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
962 {
963 ERROR ("cf_util_get_string: The %s option requires "
964 "exactly one string argument.", ci->key);
965 return (-1);
966 }
968 string = strdup (ci->values[0].value.string);
969 if (string == NULL)
970 return (-1);
972 if (*ret_string != NULL)
973 sfree (*ret_string);
974 *ret_string = string;
976 return (0);
977 } /* }}} int cf_util_get_string */
979 /* Assures the config option is a string and copies it to the provided buffer.
980 * Assures null-termination. */
981 int cf_util_get_string_buffer (const oconfig_item_t *ci, char *buffer, /* {{{ */
982 size_t buffer_size)
983 {
984 if ((ci == NULL) || (buffer == NULL) || (buffer_size < 1))
985 return (EINVAL);
987 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
988 {
989 ERROR ("cf_util_get_string_buffer: The %s option requires "
990 "exactly one string argument.", ci->key);
991 return (-1);
992 }
994 strncpy (buffer, ci->values[0].value.string, buffer_size);
995 buffer[buffer_size - 1] = 0;
997 return (0);
998 } /* }}} int cf_util_get_string_buffer */
1000 /* Assures the config option is a number and returns it as an int. */
1001 int cf_util_get_int (const oconfig_item_t *ci, int *ret_value) /* {{{ */
1002 {
1003 if ((ci == NULL) || (ret_value == NULL))
1004 return (EINVAL);
1006 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
1007 {
1008 ERROR ("cf_util_get_int: The %s option requires "
1009 "exactly one numeric argument.", ci->key);
1010 return (-1);
1011 }
1013 *ret_value = (int) ci->values[0].value.number;
1015 return (0);
1016 } /* }}} int cf_util_get_int */
1018 int cf_util_get_boolean (const oconfig_item_t *ci, _Bool *ret_bool) /* {{{ */
1019 {
1020 if ((ci == NULL) || (ret_bool == NULL))
1021 return (EINVAL);
1023 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_BOOLEAN))
1024 {
1025 ERROR ("cf_util_get_boolean: The %s option requires "
1026 "exactly one boolean argument.", ci->key);
1027 return (-1);
1028 }
1030 *ret_bool = ci->values[0].value.boolean ? 1 : 0;
1032 return (0);
1033 } /* }}} int cf_util_get_boolean */
1035 int cf_util_get_flag (const oconfig_item_t *ci, /* {{{ */
1036 unsigned int *ret_value, unsigned int flag)
1037 {
1038 int status;
1039 _Bool b;
1041 if (ret_value == NULL)
1042 return (EINVAL);
1044 b = 0;
1045 status = cf_util_get_boolean (ci, &b);
1046 if (status != 0)
1047 return (status);
1049 if (b)
1050 {
1051 *ret_value |= flag;
1052 }
1053 else
1054 {
1055 *ret_value &= ~flag;
1056 }
1058 return (0);
1059 } /* }}} int cf_util_get_flag */
1061 /* Assures that the config option is a string or a number if the correct range
1062 * of 1-65535. The string is then converted to a port number using
1063 * `service_name_to_port_number' and returned.
1064 * Returns the port number in the range [1-65535] or less than zero upon
1065 * failure. */
1066 int cf_util_get_port_number (const oconfig_item_t *ci) /* {{{ */
1067 {
1068 int tmp;
1070 if ((ci->values_num != 1)
1071 || ((ci->values[0].type != OCONFIG_TYPE_STRING)
1072 && (ci->values[0].type != OCONFIG_TYPE_NUMBER)))
1073 {
1074 ERROR ("cf_util_get_port_number: The \"%s\" option requires "
1075 "exactly one string argument.", ci->key);
1076 return (-1);
1077 }
1079 if (ci->values[0].type == OCONFIG_TYPE_STRING)
1080 return (service_name_to_port_number (ci->values[0].value.string));
1082 assert (ci->values[0].type == OCONFIG_TYPE_NUMBER);
1083 tmp = (int) (ci->values[0].value.number + 0.5);
1084 if ((tmp < 1) || (tmp > 65535))
1085 {
1086 ERROR ("cf_util_get_port_number: The \"%s\" option requires "
1087 "a service name or a port number. The number "
1088 "you specified, %i, is not in the valid "
1089 "range of 1-65535.",
1090 ci->key, tmp);
1091 return (-1);
1092 }
1094 return (tmp);
1095 } /* }}} int cf_util_get_port_number */
1097 int cf_util_get_service (const oconfig_item_t *ci, char **ret_string) /* {{{ */
1098 {
1099 int port;
1100 char *service;
1101 int status;
1103 if (ci->values_num != 1)
1104 {
1105 ERROR ("cf_util_get_service: The %s option requires exactly "
1106 "one argument.", ci->key);
1107 return (-1);
1108 }
1110 if (ci->values[0].type == OCONFIG_TYPE_STRING)
1111 return (cf_util_get_string (ci, ret_string));
1112 if (ci->values[0].type != OCONFIG_TYPE_NUMBER)
1113 {
1114 ERROR ("cf_util_get_service: The %s option requires "
1115 "exactly one string or numeric argument.",
1116 ci->key);
1117 }
1119 port = 0;
1120 status = cf_util_get_int (ci, &port);
1121 if (status != 0)
1122 return (status);
1123 else if ((port < 1) || (port > 65535))
1124 {
1125 ERROR ("cf_util_get_service: The port number given "
1126 "for the %s option is out of "
1127 "range (%i).", ci->key, port);
1128 return (-1);
1129 }
1131 service = malloc (6);
1132 if (service == NULL)
1133 {
1134 ERROR ("cf_util_get_service: Out of memory.");
1135 return (-1);
1136 }
1137 ssnprintf (service, 6, "%i", port);
1139 sfree (*ret_string);
1140 *ret_string = service;
1142 return (0);
1143 } /* }}} int cf_util_get_service */
1145 int cf_util_get_cdtime (const oconfig_item_t *ci, cdtime_t *ret_value) /* {{{ */
1146 {
1147 if ((ci == NULL) || (ret_value == NULL))
1148 return (EINVAL);
1150 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
1151 {
1152 ERROR ("cf_util_get_cdtime: The %s option requires "
1153 "exactly one numeric argument.", ci->key);
1154 return (-1);
1155 }
1157 if (ci->values[0].value.number < 0.0)
1158 {
1159 ERROR ("cf_util_get_cdtime: The numeric argument of the %s "
1160 "option must not be negative.", ci->key);
1161 return (-1);
1162 }
1164 *ret_value = DOUBLE_TO_CDTIME_T (ci->values[0].value.number);
1166 return (0);
1167 } /* }}} int cf_util_get_cdtime */