9a20f78af559d5590fdff03c4a0917bb3b5a7c98
1 /**
2 * collectd - src/common.c
3 * Copyright (C) 2005-2008 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 * Niki W. Waibel <niki.waibel@gmx.net>
21 * Sebastian Harl <sh at tokkee.org>
22 * Michał Mirosław <mirq-linux at rere.qmqm.pl>
23 **/
25 #if HAVE_CONFIG_H
26 # include "config.h"
27 #endif
29 #include "collectd.h"
30 #include "common.h"
31 #include "plugin.h"
33 #if HAVE_PTHREAD_H
34 # include <pthread.h>
35 #endif
37 #ifdef HAVE_MATH_H
38 # include <math.h>
39 #endif
41 /* for ntohl and htonl */
42 #if HAVE_ARPA_INET_H
43 # include <arpa/inet.h>
44 #endif
46 #ifdef HAVE_LIBKSTAT
47 extern kstat_ctl_t *kc;
48 #endif
50 #if !HAVE_GETPWNAM_R
51 static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
52 #endif
54 #if !HAVE_STRERROR_R
55 static pthread_mutex_t strerror_r_lock = PTHREAD_MUTEX_INITIALIZER;
56 #endif
58 char *sstrncpy (char *dest, const char *src, size_t n)
59 {
60 strncpy (dest, src, n);
61 dest[n - 1] = '\0';
63 return (dest);
64 } /* char *sstrncpy */
66 int ssnprintf (char *dest, size_t n, const char *format, ...)
67 {
68 int ret = 0;
69 va_list ap;
71 va_start (ap, format);
72 ret = vsnprintf (dest, n, format, ap);
73 dest[n - 1] = '\0';
74 va_end (ap);
76 return (ret);
77 } /* int ssnprintf */
79 char *sstrdup (const char *s)
80 {
81 char *r;
82 size_t sz;
84 if (s == NULL)
85 return (NULL);
87 /* Do not use `strdup' here, because it's not specified in POSIX. It's
88 * ``only'' an XSI extension. */
89 sz = strlen (s) + 1;
90 r = (char *) malloc (sizeof (char) * sz);
91 if (r == NULL)
92 {
93 ERROR ("sstrdup: Out of memory.");
94 exit (3);
95 }
96 memcpy (r, s, sizeof (char) * sz);
98 return (r);
99 } /* char *sstrdup */
101 /* Even though Posix requires "strerror_r" to return an "int",
102 * some systems (e.g. the GNU libc) return a "char *" _and_
103 * ignore the second argument ... -tokkee */
104 char *sstrerror (int errnum, char *buf, size_t buflen)
105 {
106 buf[0] = '\0';
108 #if !HAVE_STRERROR_R
109 {
110 char *temp;
112 pthread_mutex_lock (&strerror_r_lock);
114 temp = strerror (errnum);
115 sstrncpy (buf, temp, buflen);
117 pthread_mutex_unlock (&strerror_r_lock);
118 }
119 /* #endif !HAVE_STRERROR_R */
121 #elif STRERROR_R_CHAR_P
122 {
123 char *temp;
124 temp = strerror_r (errnum, buf, buflen);
125 if (buf[0] == '\0')
126 {
127 if ((temp != NULL) && (temp != buf) && (temp[0] != '\0'))
128 sstrncpy (buf, temp, buflen);
129 else
130 sstrncpy (buf, "strerror_r did not return "
131 "an error message", buflen);
132 }
133 }
134 /* #endif STRERROR_R_CHAR_P */
136 #else
137 if (strerror_r (errnum, buf, buflen) != 0)
138 {
139 ssnprintf (buf, buflen, "Error #%i; "
140 "Additionally, strerror_r failed.",
141 errnum);
142 }
143 #endif /* STRERROR_R_CHAR_P */
145 return (buf);
146 } /* char *sstrerror */
148 void *smalloc (size_t size)
149 {
150 void *r;
152 if ((r = malloc (size)) == NULL)
153 {
154 ERROR ("Not enough memory.");
155 exit (3);
156 }
158 return (r);
159 } /* void *smalloc */
161 #if 0
162 void sfree (void **ptr)
163 {
164 if (ptr == NULL)
165 return;
167 if (*ptr != NULL)
168 free (*ptr);
170 *ptr = NULL;
171 }
172 #endif
174 ssize_t sread (int fd, void *buf, size_t count)
175 {
176 char *ptr;
177 size_t nleft;
178 ssize_t status;
180 ptr = (char *) buf;
181 nleft = count;
183 while (nleft > 0)
184 {
185 status = read (fd, (void *) ptr, nleft);
187 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
188 continue;
190 if (status < 0)
191 return (status);
193 if (status == 0)
194 {
195 DEBUG ("Received EOF from fd %i. "
196 "Closing fd and returning error.",
197 fd);
198 close (fd);
199 return (-1);
200 }
202 assert ((0 > status) || (nleft >= (size_t)status));
204 nleft = nleft - status;
205 ptr = ptr + status;
206 }
208 return (0);
209 }
212 ssize_t swrite (int fd, const void *buf, size_t count)
213 {
214 const char *ptr;
215 size_t nleft;
216 ssize_t status;
218 ptr = (const char *) buf;
219 nleft = count;
221 while (nleft > 0)
222 {
223 status = write (fd, (const void *) ptr, nleft);
225 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
226 continue;
228 if (status < 0)
229 return (status);
231 nleft = nleft - status;
232 ptr = ptr + status;
233 }
235 return (0);
236 }
238 int strsplit (char *string, char **fields, size_t size)
239 {
240 size_t i;
241 char *ptr;
242 char *saveptr;
244 i = 0;
245 ptr = string;
246 saveptr = NULL;
247 while ((fields[i] = strtok_r (ptr, " \t\r\n", &saveptr)) != NULL)
248 {
249 ptr = NULL;
250 i++;
252 if (i >= size)
253 break;
254 }
256 return (i);
257 }
259 int strjoin (char *dst, size_t dst_len,
260 char **fields, size_t fields_num,
261 const char *sep)
262 {
263 size_t field_len;
264 size_t sep_len;
265 int i;
267 memset (dst, '\0', dst_len);
269 if (fields_num <= 0)
270 return (-1);
272 sep_len = 0;
273 if (sep != NULL)
274 sep_len = strlen (sep);
276 for (i = 0; i < (int)fields_num; i++)
277 {
278 if ((i > 0) && (sep_len > 0))
279 {
280 if (dst_len <= sep_len)
281 return (-1);
283 strncat (dst, sep, dst_len);
284 dst_len -= sep_len;
285 }
287 field_len = strlen (fields[i]);
289 if (dst_len <= field_len)
290 return (-1);
292 strncat (dst, fields[i], dst_len);
293 dst_len -= field_len;
294 }
296 return (strlen (dst));
297 }
299 int strsubstitute (char *str, char c_from, char c_to)
300 {
301 int ret;
303 if (str == NULL)
304 return (-1);
306 ret = 0;
307 while (*str != '\0')
308 {
309 if (*str == c_from)
310 {
311 *str = c_to;
312 ret++;
313 }
314 str++;
315 }
317 return (ret);
318 } /* int strsubstitute */
320 int escape_slashes (char *buf, int buf_len)
321 {
322 int i;
324 if (strcmp (buf, "/") == 0)
325 {
326 if (buf_len < 5)
327 return (-1);
329 strncpy (buf, "root", buf_len);
330 return (0);
331 }
333 if (buf_len <= 1)
334 return (0);
336 /* Move one to the left */
337 if (buf[0] == '/')
338 memmove (buf, buf + 1, buf_len - 1);
340 for (i = 0; i < buf_len - 1; i++)
341 {
342 if (buf[i] == '\0')
343 break;
344 else if (buf[i] == '/')
345 buf[i] = '_';
346 }
347 buf[i] = '\0';
349 return (0);
350 } /* int escape_slashes */
352 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
353 {
354 struct timeval *larger;
355 struct timeval *smaller;
357 int status;
359 NORMALIZE_TIMEVAL (tv0);
360 NORMALIZE_TIMEVAL (tv1);
362 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
363 {
364 if (delta != NULL) {
365 delta->tv_sec = 0;
366 delta->tv_usec = 0;
367 }
368 return (0);
369 }
371 if ((tv0.tv_sec < tv1.tv_sec)
372 || ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
373 {
374 larger = &tv1;
375 smaller = &tv0;
376 status = -1;
377 }
378 else
379 {
380 larger = &tv0;
381 smaller = &tv1;
382 status = 1;
383 }
385 if (delta != NULL) {
386 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
388 if (smaller->tv_usec <= larger->tv_usec)
389 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
390 else
391 {
392 --delta->tv_sec;
393 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
394 }
395 }
397 assert ((delta == NULL)
398 || ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
400 return (status);
401 } /* int timeval_cmp */
403 int check_create_dir (const char *file_orig)
404 {
405 struct stat statbuf;
407 char file_copy[512];
408 char dir[512];
409 int dir_len = 512;
410 char *fields[16];
411 int fields_num;
412 char *ptr;
413 char *saveptr;
414 int last_is_file = 1;
415 int path_is_absolute = 0;
416 size_t len;
417 int i;
419 /*
420 * Sanity checks first
421 */
422 if (file_orig == NULL)
423 return (-1);
425 if ((len = strlen (file_orig)) < 1)
426 return (-1);
427 else if (len >= sizeof (file_copy))
428 return (-1);
430 /*
431 * If `file_orig' ends in a slash the last component is a directory,
432 * otherwise it's a file. Act accordingly..
433 */
434 if (file_orig[len - 1] == '/')
435 last_is_file = 0;
436 if (file_orig[0] == '/')
437 path_is_absolute = 1;
439 /*
440 * Create a copy for `strtok_r' to destroy
441 */
442 sstrncpy (file_copy, file_orig, sizeof (file_copy));
444 /*
445 * Break into components. This will eat up several slashes in a row and
446 * remove leading and trailing slashes..
447 */
448 ptr = file_copy;
449 saveptr = NULL;
450 fields_num = 0;
451 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
452 {
453 ptr = NULL;
454 fields_num++;
456 if (fields_num >= 16)
457 break;
458 }
460 /*
461 * For each component, do..
462 */
463 for (i = 0; i < (fields_num - last_is_file); i++)
464 {
465 /*
466 * Do not create directories that start with a dot. This
467 * prevents `../../' attacks and other likely malicious
468 * behavior.
469 */
470 if (fields[i][0] == '.')
471 {
472 ERROR ("Cowardly refusing to create a directory that begins with a `.' (dot): `%s'", file_orig);
473 return (-2);
474 }
476 /*
477 * Join the components together again
478 */
479 dir[0] = '/';
480 if (strjoin (dir + path_is_absolute, dir_len - path_is_absolute,
481 fields, i + 1, "/") < 0)
482 {
483 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
484 return (-1);
485 }
487 if (stat (dir, &statbuf) == -1)
488 {
489 if (errno == ENOENT)
490 {
491 if (mkdir (dir, 0755) == -1)
492 {
493 char errbuf[1024];
494 ERROR ("check_create_dir: mkdir (%s): %s", dir,
495 sstrerror (errno,
496 errbuf, sizeof (errbuf)));
497 return (-1);
498 }
499 }
500 else
501 {
502 char errbuf[1024];
503 ERROR ("stat (%s): %s", dir,
504 sstrerror (errno, errbuf,
505 sizeof (errbuf)));
506 return (-1);
507 }
508 }
509 else if (!S_ISDIR (statbuf.st_mode))
510 {
511 ERROR ("stat (%s): Not a directory!", dir);
512 return (-1);
513 }
514 }
516 return (0);
517 } /* check_create_dir */
519 #ifdef HAVE_LIBKSTAT
520 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
521 {
522 char ident[128];
524 if (kc == NULL)
525 return (-1);
527 ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
529 if (*ksp_ptr == NULL)
530 {
531 if ((*ksp_ptr = kstat_lookup (kc, module, instance, name)) == NULL)
532 {
533 ERROR ("Cound not find kstat %s", ident);
534 return (-1);
535 }
537 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
538 {
539 WARNING ("kstat %s has wrong type", ident);
540 *ksp_ptr = NULL;
541 return (-1);
542 }
543 }
545 #ifdef assert
546 assert (*ksp_ptr != NULL);
547 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
548 #endif
550 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
551 {
552 WARNING ("kstat %s could not be read", ident);
553 return (-1);
554 }
556 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
557 {
558 WARNING ("kstat %s has wrong type", ident);
559 return (-1);
560 }
562 return (0);
563 }
565 long long get_kstat_value (kstat_t *ksp, char *name)
566 {
567 kstat_named_t *kn;
568 long long retval = -1LL;
570 #ifdef assert
571 assert (ksp != NULL);
572 assert (ksp->ks_type == KSTAT_TYPE_NAMED);
573 #else
574 if (ksp == NULL)
575 {
576 ERROR ("ERROR: %s:%i: ksp == NULL\n", __FILE__, __LINE__);
577 return (-1LL);
578 }
579 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
580 {
581 ERROR ("ERROR: %s:%i: ksp->ks_type != KSTAT_TYPE_NAMED\n", __FILE__, __LINE__);
582 return (-1LL);
583 }
584 #endif
586 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
587 return (retval);
589 if (kn->data_type == KSTAT_DATA_INT32)
590 retval = (long long) kn->value.i32;
591 else if (kn->data_type == KSTAT_DATA_UINT32)
592 retval = (long long) kn->value.ui32;
593 else if (kn->data_type == KSTAT_DATA_INT64)
594 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
595 else if (kn->data_type == KSTAT_DATA_UINT64)
596 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
597 else
598 WARNING ("get_kstat_value: Not a numeric value: %s", name);
600 return (retval);
601 }
602 #endif /* HAVE_LIBKSTAT */
604 unsigned long long ntohll (unsigned long long n)
605 {
606 #if BYTE_ORDER == BIG_ENDIAN
607 return (n);
608 #else
609 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
610 #endif
611 } /* unsigned long long ntohll */
613 unsigned long long htonll (unsigned long long n)
614 {
615 #if BYTE_ORDER == BIG_ENDIAN
616 return (n);
617 #else
618 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
619 #endif
620 } /* unsigned long long htonll */
622 #if FP_LAYOUT_NEED_NOTHING
623 /* Well, we need nothing.. */
624 /* #endif FP_LAYOUT_NEED_NOTHING */
626 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
627 # if FP_LAYOUT_NEED_ENDIANFLIP
628 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
629 (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
630 (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
631 (((uint64_t)(A) & 0x000000ff00000000LL) >> 8) | \
632 (((uint64_t)(A) & 0x00000000ff000000LL) << 8) | \
633 (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
634 (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
635 (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
636 # else
637 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
638 (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
639 # endif
641 double ntohd (double d)
642 {
643 union
644 {
645 uint8_t byte[8];
646 uint64_t integer;
647 double floating;
648 } ret;
650 ret.floating = d;
652 /* NAN in x86 byte order */
653 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
654 && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
655 && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
656 && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
657 {
658 return (NAN);
659 }
660 else
661 {
662 uint64_t tmp;
664 tmp = ret.integer;
665 ret.integer = FP_CONVERT (tmp);
666 return (ret.floating);
667 }
668 } /* double ntohd */
670 double htond (double d)
671 {
672 union
673 {
674 uint8_t byte[8];
675 uint64_t integer;
676 double floating;
677 } ret;
679 if (isnan (d))
680 {
681 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
682 ret.byte[4] = ret.byte[5] = 0x00;
683 ret.byte[6] = 0xf8;
684 ret.byte[7] = 0x7f;
685 return (ret.floating);
686 }
687 else
688 {
689 uint64_t tmp;
691 ret.floating = d;
692 tmp = FP_CONVERT (ret.integer);
693 ret.integer = tmp;
694 return (ret.floating);
695 }
696 } /* double htond */
697 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
699 int format_name (char *ret, int ret_len,
700 const char *hostname,
701 const char *plugin, const char *plugin_instance,
702 const char *type, const char *type_instance)
703 {
704 int status;
706 assert (plugin != NULL);
707 assert (type != NULL);
709 if ((plugin_instance == NULL) || (strlen (plugin_instance) == 0))
710 {
711 if ((type_instance == NULL) || (strlen (type_instance) == 0))
712 status = ssnprintf (ret, ret_len, "%s/%s/%s",
713 hostname, plugin, type);
714 else
715 status = ssnprintf (ret, ret_len, "%s/%s/%s-%s",
716 hostname, plugin, type,
717 type_instance);
718 }
719 else
720 {
721 if ((type_instance == NULL) || (strlen (type_instance) == 0))
722 status = ssnprintf (ret, ret_len, "%s/%s-%s/%s",
723 hostname, plugin, plugin_instance,
724 type);
725 else
726 status = ssnprintf (ret, ret_len, "%s/%s-%s/%s-%s",
727 hostname, plugin, plugin_instance,
728 type, type_instance);
729 }
731 if ((status < 1) || (status >= ret_len))
732 return (-1);
733 return (0);
734 } /* int format_name */
736 int parse_identifier (char *str, char **ret_host,
737 char **ret_plugin, char **ret_plugin_instance,
738 char **ret_type, char **ret_type_instance)
739 {
740 char *hostname = NULL;
741 char *plugin = NULL;
742 char *plugin_instance = NULL;
743 char *type = NULL;
744 char *type_instance = NULL;
746 hostname = str;
747 if (hostname == NULL)
748 return (-1);
750 plugin = strchr (hostname, '/');
751 if (plugin == NULL)
752 return (-1);
753 *plugin = '\0'; plugin++;
755 type = strchr (plugin, '/');
756 if (type == NULL)
757 return (-1);
758 *type = '\0'; type++;
760 plugin_instance = strchr (plugin, '-');
761 if (plugin_instance != NULL)
762 {
763 *plugin_instance = '\0';
764 plugin_instance++;
765 }
767 type_instance = strchr (type, '-');
768 if (type_instance != NULL)
769 {
770 *type_instance = '\0';
771 type_instance++;
772 }
774 *ret_host = hostname;
775 *ret_plugin = plugin;
776 *ret_plugin_instance = plugin_instance;
777 *ret_type = type;
778 *ret_type_instance = type_instance;
779 return (0);
780 } /* int parse_identifier */
782 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
783 {
784 int i;
785 char *dummy;
786 char *ptr;
787 char *saveptr;
789 i = -1;
790 dummy = buffer;
791 saveptr = NULL;
792 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
793 {
794 dummy = NULL;
796 if (i >= vl->values_len)
797 break;
799 if (i == -1)
800 {
801 if (strcmp ("N", ptr) == 0)
802 vl->time = time (NULL);
803 else
804 vl->time = (time_t) atoi (ptr);
805 }
806 else
807 {
808 if (strcmp ("U", ptr) == 0)
809 vl->values[i].gauge = NAN;
810 else if (ds->ds[i].type == DS_TYPE_COUNTER)
811 vl->values[i].counter = atoll (ptr);
812 else if (ds->ds[i].type == DS_TYPE_GAUGE)
813 vl->values[i].gauge = atof (ptr);
814 }
816 i++;
817 } /* while (strtok_r) */
819 if ((ptr != NULL) || (i != vl->values_len))
820 return (-1);
821 return (0);
822 } /* int parse_values */
824 #if !HAVE_GETPWNAM_R
825 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
826 size_t buflen, struct passwd **pwbufp)
827 {
828 int status = 0;
829 struct passwd *pw;
831 memset (pwbuf, '\0', sizeof (struct passwd));
833 pthread_mutex_lock (&getpwnam_r_lock);
835 do
836 {
837 pw = getpwnam (name);
838 if (pw == NULL)
839 {
840 status = (errno != 0) ? errno : ENOENT;
841 break;
842 }
844 #define GETPWNAM_COPY_MEMBER(member) \
845 if (pw->member != NULL) \
846 { \
847 int len = strlen (pw->member); \
848 if (len >= buflen) \
849 { \
850 status = ENOMEM; \
851 break; \
852 } \
853 sstrncpy (buf, pw->member, buflen); \
854 pwbuf->member = buf; \
855 buf += (len + 1); \
856 buflen -= (len + 1); \
857 }
858 GETPWNAM_COPY_MEMBER(pw_name);
859 GETPWNAM_COPY_MEMBER(pw_passwd);
860 GETPWNAM_COPY_MEMBER(pw_gecos);
861 GETPWNAM_COPY_MEMBER(pw_dir);
862 GETPWNAM_COPY_MEMBER(pw_shell);
864 pwbuf->pw_uid = pw->pw_uid;
865 pwbuf->pw_gid = pw->pw_gid;
867 if (pwbufp != NULL)
868 *pwbufp = pwbuf;
869 } while (0);
871 pthread_mutex_unlock (&getpwnam_r_lock);
873 return (status);
874 } /* int getpwnam_r */
875 #endif /* !HAVE_GETPWNAM_R */
877 int notification_init (notification_t *n, int severity, const char *message,
878 const char *host,
879 const char *plugin, const char *plugin_instance,
880 const char *type, const char *type_instance)
881 {
882 memset (n, '\0', sizeof (notification_t));
884 n->severity = severity;
886 if (message != NULL)
887 sstrncpy (n->message, message, sizeof (n->message));
888 if (host != NULL)
889 sstrncpy (n->host, host, sizeof (n->host));
890 if (plugin != NULL)
891 sstrncpy (n->plugin, plugin, sizeof (n->plugin));
892 if (plugin_instance != NULL)
893 sstrncpy (n->plugin_instance, plugin_instance,
894 sizeof (n->plugin_instance));
895 if (type != NULL)
896 sstrncpy (n->type, type, sizeof (n->type));
897 if (type_instance != NULL)
898 sstrncpy (n->type_instance, type_instance,
899 sizeof (n->type_instance));
901 return (0);
902 } /* int notification_init */
904 int walk_directory (const char *dir, dirwalk_callback_f callback,
905 void *user_data)
906 {
907 struct dirent *ent;
908 DIR *dh;
909 int success;
910 int failure;
912 success = 0;
913 failure = 0;
915 if ((dh = opendir (dir)) == NULL)
916 {
917 char errbuf[1024];
918 ERROR ("walk_directory: Cannot open '%s': %s", dir,
919 sstrerror (errno, errbuf, sizeof (errbuf)));
920 return -1;
921 }
923 while ((ent = readdir (dh)) != NULL)
924 {
925 int status;
927 if (ent->d_name[0] == '.')
928 continue;
930 status = (*callback) (dir, ent->d_name, user_data);
931 if (status != 0)
932 failure++;
933 else
934 success++;
935 }
937 closedir (dh);
939 if ((success == 0) && (failure > 0))
940 return (-1);
941 return (0);
942 }
944 int read_file_contents (const char *filename, char *buf, int bufsize)
945 {
946 FILE *fh;
947 int n;
949 if ((fh = fopen (filename, "r")) == NULL)
950 return -1;
952 n = fread(buf, 1, bufsize, fh);
953 fclose(fh);
955 return n;
956 }
958 counter_t counter_diff (counter_t old_value, counter_t new_value)
959 {
960 counter_t diff;
962 if (old_value > new_value)
963 {
964 if (old_value <= 4294967295U)
965 diff = (4294967295U - old_value) + new_value;
966 else
967 diff = (18446744073709551615ULL - old_value)
968 + new_value;
969 }
970 else
971 {
972 diff = new_value - old_value;
973 }
975 return (diff);
976 } /* counter_t counter_to_gauge */