7690d01949175869928ad95f986af9409150270f
1 /**
2 * collectd - src/common.c
3 * Copyright (C) 2005,2006 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/
6 * or modify it under the terms of the GNU General Public Li-
7 * cence as published by the Free Software Foundation; either
8 * version 2 of the Licence, or any later version.
9 *
10 * This program is distributed in the hope that it will be use-
11 * ful, but WITHOUT ANY WARRANTY; without even the implied war-
12 * ranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 * See the GNU General Public Licence for more details.
14 *
15 * You should have received a copy of the GNU General Public
16 * Licence along with this program; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
18 * USA.
19 *
20 * Authors:
21 * Florian octo Forster <octo at verplant.org>
22 * Niki W. Waibel <niki.waibel@gmx.net>
23 **/
25 #include "common.h"
26 #include "utils_debug.h"
28 #ifdef HAVE_MATH_H
29 # include <math.h>
30 #endif
32 extern int operating_mode;
34 #ifdef HAVE_LIBKSTAT
35 extern kstat_ctl_t *kc;
36 #endif
38 #ifdef HAVE_LIBRRD
39 #if 0
40 static char *rra_def[] =
41 {
42 "RRA:AVERAGE:0.0:1:1500",
43 "RRA:AVERAGE:0.2:6:1500",
44 "RRA:AVERAGE:0.1:180:1680",
45 "RRA:AVERAGE:0.1:2160:1520",
46 "RRA:MIN:0.0:1:1500",
47 "RRA:MIN:0.2:6:1500",
48 "RRA:MIN:0.1:180:1680",
49 "RRA:MIN:0.1:2160:1520",
50 "RRA:MAX:0.0:1:1500",
51 "RRA:MAX:0.2:6:1500",
52 "RRA:MAX:0.1:180:1680",
53 "RRA:MAX:0.1:2160:1520",
54 NULL
55 };
56 static int rra_num = 12;
57 #endif
59 static int rra_timespans[] =
60 {
61 3600,
62 86400,
63 604800,
64 2678400,
65 31622400,
66 0
67 };
68 static int rra_timespans_num = 5;
70 static char *rra_types[] =
71 {
72 "AVERAGE",
73 "MIN",
74 "MAX",
75 NULL
76 };
77 static int rra_types_num = 3;
78 #endif /* HAVE_LIBRRD */
80 void sstrncpy (char *d, const char *s, int len)
81 {
82 strncpy (d, s, len);
83 d[len - 1] = '\0';
84 }
86 char *sstrdup (const char *s)
87 {
88 char *r;
90 if (s == NULL)
91 return (NULL);
93 if((r = strdup (s)) == NULL)
94 {
95 DBG ("Not enough memory.");
96 exit(3);
97 }
99 return (r);
100 }
102 void *smalloc (size_t size)
103 {
104 void *r;
106 if ((r = malloc (size)) == NULL)
107 {
108 DBG("Not enough memory.");
109 exit(3);
110 }
112 return r;
113 }
115 #if 0
116 void sfree (void **ptr)
117 {
118 if (ptr == NULL)
119 return;
121 if (*ptr != NULL)
122 free (*ptr);
124 *ptr = NULL;
125 }
126 #endif
128 int strsplit (char *string, char **fields, size_t size)
129 {
130 size_t i;
131 char *ptr;
133 i = 0;
134 ptr = string;
135 while ((fields[i] = strtok (ptr, " \t")) != NULL)
136 {
137 ptr = NULL;
138 i++;
140 if (i >= size)
141 break;
142 }
144 return (i);
145 }
147 int strjoin (char *dst, size_t dst_len,
148 char **fields, size_t fields_num,
149 const char *sep)
150 {
151 int field_len;
152 int sep_len;
153 int i;
155 memset (dst, '\0', dst_len);
157 if (fields_num <= 0)
158 return (-1);
160 sep_len = 0;
161 if (sep != NULL)
162 sep_len = strlen (sep);
164 for (i = 0; i < fields_num; i++)
165 {
166 if ((i > 0) && (sep_len > 0))
167 {
168 if (dst_len <= sep_len)
169 return (-1);
171 strncat (dst, sep, dst_len);
172 dst_len -= sep_len;
173 }
175 field_len = strlen (fields[i]);
177 if (dst_len <= field_len)
178 return (-1);
180 strncat (dst, fields[i], dst_len);
181 dst_len -= field_len;
182 }
184 return (strlen (dst));
185 }
187 int strsubstitute (char *str, char c_from, char c_to)
188 {
189 int ret;
191 if (str == NULL)
192 return (-1);
194 ret = 0;
195 while (*str != '\0')
196 {
197 if (*str == c_from)
198 {
199 *str = c_to;
200 ret++;
201 }
202 str++;
203 }
205 return (ret);
206 }
208 int escape_slashes (char *buf, int buf_len)
209 {
210 int i;
212 if (strcmp (buf, "/") == 0)
213 {
214 if (buf_len < 5)
215 return (-1);
217 strncpy (buf, "root", buf_len);
218 return (0);
219 }
221 /* Move one to the left */
222 memmove (buf, buf + 1, buf_len - 1);
224 for (i = 0; i < buf_len - 1; i++)
225 {
226 if (buf[i] == '\0')
227 break;
228 else if (buf[i] == '/')
229 buf[i] = '_';
230 }
231 buf[i] = '\0';
233 return (0);
234 }
236 int timeval_sub_timespec (struct timeval *tv0, struct timeval *tv1, struct timespec *ret)
237 {
238 if ((tv0 == NULL) || (tv1 == NULL) || (ret == NULL))
239 return (-2);
241 if ((tv0->tv_sec < tv1->tv_sec)
242 || ((tv0->tv_sec == tv1->tv_sec) && (tv0->tv_usec < tv1->tv_usec)))
243 return (-1);
245 ret->tv_sec = tv0->tv_sec - tv1->tv_sec;
246 ret->tv_nsec = 1000 * ((long) (tv0->tv_usec - tv1->tv_usec));
248 if (ret->tv_nsec < 0)
249 {
250 assert (ret->tv_sec > 0);
252 ret->tv_nsec += 1000000000;
253 ret->tv_sec -= 1;
254 }
256 return (0);
257 }
259 static int check_create_dir (const char *file_orig)
260 {
261 struct stat statbuf;
263 char file_copy[512];
264 char dir[512];
265 int dir_len = 512;
266 char *fields[16];
267 int fields_num;
268 char *ptr;
269 int last_is_file = 1;
270 int len;
271 int i;
273 /*
274 * Sanity checks first
275 */
276 if (file_orig == NULL)
277 return (-1);
279 if ((len = strlen (file_orig)) < 1)
280 return (-1);
281 else if (len >= 512)
282 return (-1);
284 /*
285 * If `file_orig' ends in a slash the last component is a directory,
286 * otherwise it's a file. Act accordingly..
287 */
288 if (file_orig[len - 1] == '/')
289 last_is_file = 0;
291 /*
292 * Create a copy for `strtok' to destroy
293 */
294 strncpy (file_copy, file_orig, 512);
295 file_copy[511] = '\0';
297 /*
298 * Break into components. This will eat up several slashes in a row and
299 * remove leading and trailing slashes..
300 */
301 ptr = file_copy;
302 fields_num = 0;
303 while ((fields[fields_num] = strtok (ptr, "/")) != NULL)
304 {
305 ptr = NULL;
306 fields_num++;
308 if (fields_num >= 16)
309 break;
310 }
312 /*
313 * For each component, do..
314 */
315 for (i = 0; i < (fields_num - last_is_file); i++)
316 {
317 /*
318 * Do not create directories that start with a dot. This
319 * prevents `../../' attacks and other likely malicious
320 * behavior.
321 */
322 if (fields[i][0] == '.')
323 {
324 syslog (LOG_ERR, "Cowardly refusing to create a directory that begins with a `.' (dot): `%s'", file_orig);
325 return (-2);
326 }
328 /*
329 * Join the components together again
330 */
331 if (strjoin (dir, dir_len, fields, i + 1, "/") < 0)
332 {
333 syslog (LOG_ERR, "strjoin failed: `%s', component #%i", file_orig, i);
334 return (-1);
335 }
337 if (stat (dir, &statbuf) == -1)
338 {
339 if (errno == ENOENT)
340 {
341 if (mkdir (dir, 0755) == -1)
342 {
343 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
344 return (-1);
345 }
346 }
347 else
348 {
349 syslog (LOG_ERR, "stat (%s): %s", dir, strerror (errno));
350 return (-1);
351 }
352 }
353 else if (!S_ISDIR (statbuf.st_mode))
354 {
355 syslog (LOG_ERR, "stat (%s): Not a directory!", dir);
356 return (-1);
357 }
358 }
360 return (0);
361 }
363 /* * * * *
364 * Magic *
365 * * * * */
366 int rra_get (char ***ret)
367 {
368 static char **rra_def = NULL;
369 static int rra_num = 0;
371 int rra_max = rra_timespans_num * rra_types_num;
373 int step;
374 int rows;
375 int span;
377 int cdp_num;
378 int cdp_len;
379 int i, j;
381 char buffer[64];
383 if ((rra_num != 0) && (rra_def != NULL))
384 {
385 *ret = rra_def;
386 return (rra_num);
387 }
389 if ((rra_def = (char **) malloc ((rra_max + 1) * sizeof (char *))) == NULL)
390 return (-1);
391 memset (rra_def, '\0', (rra_max + 1) * sizeof (char *));
393 step = atoi (COLLECTD_STEP);
394 rows = atoi (COLLECTD_ROWS);
396 if ((step <= 0) || (rows <= 0))
397 {
398 *ret = NULL;
399 return (-1);
400 }
402 cdp_len = 0;
403 for (i = 0; i < rra_timespans_num; i++)
404 {
405 span = rra_timespans[i];
407 if ((span / step) < rows)
408 continue;
410 if (cdp_len == 0)
411 cdp_len = 1;
412 else
413 cdp_len = (int) floor (((double) span) / ((double) (rows * step)));
415 cdp_num = (int) ceil (((double) span) / ((double) (cdp_len * step)));
417 for (j = 0; j < rra_types_num; j++)
418 {
419 if (rra_num >= rra_max)
420 break;
422 if (snprintf (buffer, sizeof(buffer), "RRA:%s:%3.1f:%u:%u",
423 rra_types[j], COLLECTD_XFF,
424 cdp_len, cdp_num) >= sizeof (buffer))
425 {
426 syslog (LOG_ERR, "rra_get: Buffer would have been truncated.");
427 continue;
428 }
430 rra_def[rra_num++] = sstrdup (buffer);
431 }
432 }
434 #if COLLECT_DEBUG
435 DBG ("rra_num = %i", rra_num);
436 for (i = 0; i < rra_num; i++)
437 DBG (" %s", rra_def[i]);
438 #endif
440 *ret = rra_def;
441 return (rra_num);
442 }
444 static int log_create_file (char *filename, char **ds_def, int ds_num)
445 {
446 FILE *log;
447 int i;
449 log = fopen (filename, "w");
450 if (log == NULL)
451 {
452 syslog (LOG_WARNING, "Failed to create %s: %s", filename,
453 strerror(errno));
454 return (-1);
455 }
457 fprintf (log, "epoch");
458 for (i = 0; i < ds_num; i++)
459 {
460 char *name;
461 char *tmp;
463 name = strchr (ds_def[i], ':');
464 if (name == NULL)
465 {
466 syslog (LOG_WARNING, "Invalid DS definition '%s' for %s",
467 ds_def[i], filename);
468 fclose(log);
469 remove(filename);
470 return (-1);
471 }
473 name += 1;
474 tmp = strchr (name, ':');
475 if (tmp == NULL)
476 {
477 syslog (LOG_WARNING, "Invalid DS definition '%s' for %s",
478 ds_def[i], filename);
479 fclose(log);
480 remove(filename);
481 return (-1);
482 }
484 /* The `%.*s' is needed because there is no null-byte behind
485 * the name. */
486 fprintf(log, ",%.*s", (tmp - name), name);
487 }
488 fprintf(log, "\n");
489 fclose(log);
491 return 0;
492 }
494 static int log_update_file (char *host, char *file, char *values,
495 char **ds_def, int ds_num)
496 {
497 char *tmp;
498 FILE *fp;
499 struct stat statbuf;
500 char full_file[1024];
502 /* Cook the values a bit: Substitute colons with commas */
503 strsubstitute (values, ':', ',');
505 /* host == NULL => local mode */
506 if (host != NULL)
507 {
508 if (snprintf (full_file, 1024, "%s/%s", host, file) >= 1024)
509 return (-1);
510 }
511 else
512 {
513 if (snprintf (full_file, 1024, "%s", file) >= 1024)
514 return (-1);
515 }
517 strncpy (full_file, file, 1024);
519 tmp = full_file + strlen (full_file) - 4;
520 assert (tmp > 0);
522 /* Change the filename for logfiles. */
523 if (strncmp (tmp, ".rrd", 4) == 0)
524 {
525 time_t now;
526 struct tm *tm;
528 /* TODO: Find a way to minimize the calls to `localtime', since
529 * they are pretty expensive.. */
530 now = time (NULL);
531 tm = localtime (&now);
533 strftime (tmp, 1024 - (tmp - full_file), "-%Y-%m-%d", tm);
535 /* `localtime(3)' returns a pointer to static data,
536 * therefore the pointer may not be free'd. */
537 }
538 else
539 DBG ("The filename ends with `%s' which is unexpected.", tmp);
541 if (stat (full_file, &statbuf) == -1)
542 {
543 if (errno == ENOENT)
544 {
545 if (log_create_file (full_file, ds_def, ds_num))
546 return (-1);
547 }
548 else
549 {
550 syslog (LOG_ERR, "stat %s: %s", full_file, strerror (errno));
551 return (-1);
552 }
553 }
554 else if (!S_ISREG (statbuf.st_mode))
555 {
556 syslog (LOG_ERR, "stat %s: Not a regular file!", full_file);
557 return (-1);
558 }
561 fp = fopen (full_file, "a");
562 if (fp == NULL)
563 {
564 syslog (LOG_WARNING, "Failed to append to %s: %s", full_file,
565 strerror(errno));
566 return (-1);
567 }
568 fprintf(fp, "%s\n", values);
569 fclose(fp);
571 return (0);
572 } /* int log_update_file */
574 #if HAVE_LIBRRD
575 static int rrd_create_file (char *filename, char **ds_def, int ds_num)
576 {
577 char **argv;
578 int argc;
579 char **rra_def;
580 int rra_num;
581 int i, j;
582 int status = 0;
584 if (check_create_dir (filename))
585 return (-1);
587 if ((rra_num = rra_get (&rra_def)) < 1)
588 {
589 syslog (LOG_ERR, "rra_create failed: Could not calculate RRAs");
590 return (-1);
591 }
593 argc = ds_num + rra_num + 4;
595 if ((argv = (char **) malloc (sizeof (char *) * (argc + 1))) == NULL)
596 {
597 syslog (LOG_ERR, "rrd_create failed: %s", strerror (errno));
598 return (-1);
599 }
601 argv[0] = "create";
602 argv[1] = filename;
603 argv[2] = "-s";
604 argv[3] = COLLECTD_STEP;
606 j = 4;
607 for (i = 0; i < ds_num; i++)
608 argv[j++] = ds_def[i];
609 for (i = 0; i < rra_num; i++)
610 argv[j++] = rra_def[i];
611 argv[j] = NULL;
613 optind = 0; /* bug in librrd? */
614 rrd_clear_error ();
615 if (rrd_create (argc, argv) == -1)
616 {
617 syslog (LOG_ERR, "rrd_create failed: %s: %s", filename, rrd_get_error ());
618 status = -1;
619 }
621 free (argv);
623 return (status);
624 }
625 #endif /* HAVE_LIBRRD */
627 int rrd_update_file (char *host, char *file, char *values,
628 char **ds_def, int ds_num)
629 {
630 #if HAVE_LIBRRD
631 struct stat statbuf;
632 char full_file[1024];
633 char *argv[4] = { "update", full_file, values, NULL };
634 #endif /* HAVE_LIBRRD */
636 /* I'd rather have a function `common_update_file' to make this
637 * decission, but for that we'd need to touch all plugins.. */
638 if (operating_mode == MODE_LOG)
639 return (log_update_file (host, file, values,
640 ds_def, ds_num));
642 #if HAVE_LIBRRD
643 /* host == NULL => local mode */
644 if (host != NULL)
645 {
646 if (snprintf (full_file, 1024, "%s/%s", host, file) >= 1024)
647 return (-1);
648 }
649 else
650 {
651 if (snprintf (full_file, 1024, "%s", file) >= 1024)
652 return (-1);
653 }
655 if (stat (full_file, &statbuf) == -1)
656 {
657 if (errno == ENOENT)
658 {
659 if (rrd_create_file (full_file, ds_def, ds_num))
660 return (-1);
661 }
662 else
663 {
664 syslog (LOG_ERR, "stat %s: %s", full_file, strerror (errno));
665 return (-1);
666 }
667 }
668 else if (!S_ISREG (statbuf.st_mode))
669 {
670 syslog (LOG_ERR, "stat %s: Not a regular file!", full_file);
671 return (-1);
672 }
674 optind = 0; /* bug in librrd? */
675 rrd_clear_error ();
676 if (rrd_update (3, argv) == -1)
677 {
678 syslog (LOG_WARNING, "rrd_update failed: %s: %s", full_file, rrd_get_error ());
679 return (-1);
680 }
681 return (0);
682 /* #endif HAVE_LIBRRD */
684 #else
685 syslog (LOG_ERR, "`rrd_update_file' was called, but collectd isn't linked against librrd!");
686 return (-1);
687 #endif
688 }
690 #ifdef HAVE_LIBKSTAT
691 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
692 {
693 char ident[128];
695 if (kc == NULL)
696 return (-1);
698 snprintf (ident, 128, "%s,%i,%s", module, instance, name);
699 ident[127] = '\0';
701 if (*ksp_ptr == NULL)
702 {
703 if ((*ksp_ptr = kstat_lookup (kc, module, instance, name)) == NULL)
704 {
705 syslog (LOG_ERR, "Cound not find kstat %s", ident);
706 return (-1);
707 }
709 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
710 {
711 syslog (LOG_WARNING, "kstat %s has wrong type", ident);
712 *ksp_ptr = NULL;
713 return (-1);
714 }
715 }
717 #ifdef assert
718 assert (*ksp_ptr != NULL);
719 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
720 #endif
722 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
723 {
724 syslog (LOG_WARNING, "kstat %s could not be read", ident);
725 return (-1);
726 }
728 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
729 {
730 syslog (LOG_WARNING, "kstat %s has wrong type", ident);
731 return (-1);
732 }
734 return (0);
735 }
737 long long get_kstat_value (kstat_t *ksp, char *name)
738 {
739 kstat_named_t *kn;
740 long long retval = -1LL;
742 #ifdef assert
743 assert (ksp != NULL);
744 assert (ksp->ks_type == KSTAT_TYPE_NAMED);
745 #else
746 if (ksp == NULL)
747 {
748 fprintf (stderr, "ERROR: %s:%i: ksp == NULL\n", __FILE__, __LINE__);
749 return (-1LL);
750 }
751 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
752 {
753 fprintf (stderr, "ERROR: %s:%i: ksp->ks_type != KSTAT_TYPE_NAMED\n", __FILE__, __LINE__);
754 return (-1LL);
755 }
756 #endif
758 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
759 return (retval);
761 if (kn->data_type == KSTAT_DATA_INT32)
762 retval = (long long) kn->value.i32;
763 else if (kn->data_type == KSTAT_DATA_UINT32)
764 retval = (long long) kn->value.ui32;
765 else if (kn->data_type == KSTAT_DATA_INT64)
766 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
767 else if (kn->data_type == KSTAT_DATA_UINT64)
768 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
769 else
770 syslog (LOG_WARNING, "get_kstat_value: Not a numeric value: %s", name);
772 return (retval);
773 }
774 #endif /* HAVE_LIBKSTAT */