1 /**
2 * collectd - src/common.c
3 * Copyright (C) 2005-2014 Florian octo Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian octo Forster <octo at collectd.org>
25 * Niki W. Waibel <niki.waibel@gmx.net>
26 * Sebastian Harl <sh at tokkee.org>
27 * Michał Mirosław <mirq-linux at rere.qmqm.pl>
28 **/
30 #if HAVE_CONFIG_H
31 # include "config.h"
32 #endif
34 #include "collectd.h"
36 #include "common.h"
37 #include "plugin.h"
38 #include "utils_cache.h"
40 #ifdef HAVE_MATH_H
41 # include <math.h>
42 #endif
44 /* for getaddrinfo */
45 #include <sys/types.h>
46 #include <netdb.h>
48 #include <poll.h>
50 #if HAVE_NETINET_IN_H
51 # include <netinet/in.h>
52 #endif
54 #if HAVE_NETINET_TCP_H
55 # include <netinet/tcp.h>
56 #endif
58 /* for ntohl and htonl */
59 #if HAVE_ARPA_INET_H
60 # include <arpa/inet.h>
61 #endif
63 #ifdef HAVE_SYS_CAPABILITY_H
64 # include <sys/capability.h>
65 #endif
67 #ifdef HAVE_LIBKSTAT
68 extern kstat_ctl_t *kc;
69 #endif
71 #if !HAVE_GETPWNAM_R
72 static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
73 #endif
75 #if !HAVE_STRERROR_R
76 static pthread_mutex_t strerror_r_lock = PTHREAD_MUTEX_INITIALIZER;
77 #endif
79 char *sstrncpy (char *dest, const char *src, size_t n)
80 {
81 strncpy (dest, src, n);
82 dest[n - 1] = '\0';
84 return (dest);
85 } /* char *sstrncpy */
87 int ssnprintf (char *dest, size_t n, const char *format, ...)
88 {
89 int ret = 0;
90 va_list ap;
92 va_start (ap, format);
93 ret = vsnprintf (dest, n, format, ap);
94 dest[n - 1] = '\0';
95 va_end (ap);
97 return (ret);
98 } /* int ssnprintf */
100 char *ssnprintf_alloc (char const *format, ...) /* {{{ */
101 {
102 char static_buffer[1024] = "";
103 char *alloc_buffer;
104 size_t alloc_buffer_size;
105 int status;
106 va_list ap;
108 /* Try printing into the static buffer. In many cases it will be
109 * sufficiently large and we can simply return a strdup() of this
110 * buffer. */
111 va_start (ap, format);
112 status = vsnprintf (static_buffer, sizeof (static_buffer), format, ap);
113 va_end (ap);
114 if (status < 0)
115 return (NULL);
117 /* "status" does not include the null byte. */
118 alloc_buffer_size = (size_t) (status + 1);
119 if (alloc_buffer_size <= sizeof (static_buffer))
120 return (strdup (static_buffer));
122 /* Allocate a buffer large enough to hold the string. */
123 alloc_buffer = calloc (1, alloc_buffer_size);
124 if (alloc_buffer == NULL)
125 return (NULL);
127 /* Print again into this new buffer. */
128 va_start (ap, format);
129 status = vsnprintf (alloc_buffer, alloc_buffer_size, format, ap);
130 va_end (ap);
131 if (status < 0)
132 {
133 sfree (alloc_buffer);
134 return (NULL);
135 }
137 return (alloc_buffer);
138 } /* }}} char *ssnprintf_alloc */
140 char *sstrdup (const char *s)
141 {
142 char *r;
143 size_t sz;
145 if (s == NULL)
146 return (NULL);
148 /* Do not use `strdup' here, because it's not specified in POSIX. It's
149 * ``only'' an XSI extension. */
150 sz = strlen (s) + 1;
151 r = malloc (sz);
152 if (r == NULL)
153 {
154 ERROR ("sstrdup: Out of memory.");
155 exit (3);
156 }
157 memcpy (r, s, sizeof (char) * sz);
159 return (r);
160 } /* char *sstrdup */
162 /* Even though Posix requires "strerror_r" to return an "int",
163 * some systems (e.g. the GNU libc) return a "char *" _and_
164 * ignore the second argument ... -tokkee */
165 char *sstrerror (int errnum, char *buf, size_t buflen)
166 {
167 buf[0] = '\0';
169 #if !HAVE_STRERROR_R
170 {
171 char *temp;
173 pthread_mutex_lock (&strerror_r_lock);
175 temp = strerror (errnum);
176 sstrncpy (buf, temp, buflen);
178 pthread_mutex_unlock (&strerror_r_lock);
179 }
180 /* #endif !HAVE_STRERROR_R */
182 #elif STRERROR_R_CHAR_P
183 {
184 char *temp;
185 temp = strerror_r (errnum, buf, buflen);
186 if (buf[0] == '\0')
187 {
188 if ((temp != NULL) && (temp != buf) && (temp[0] != '\0'))
189 sstrncpy (buf, temp, buflen);
190 else
191 sstrncpy (buf, "strerror_r did not return "
192 "an error message", buflen);
193 }
194 }
195 /* #endif STRERROR_R_CHAR_P */
197 #else
198 if (strerror_r (errnum, buf, buflen) != 0)
199 {
200 ssnprintf (buf, buflen, "Error #%i; "
201 "Additionally, strerror_r failed.",
202 errnum);
203 }
204 #endif /* STRERROR_R_CHAR_P */
206 return (buf);
207 } /* char *sstrerror */
209 void *smalloc (size_t size)
210 {
211 void *r;
213 if ((r = malloc (size)) == NULL)
214 {
215 ERROR ("Not enough memory.");
216 exit (3);
217 }
219 return (r);
220 } /* void *smalloc */
222 #if 0
223 void sfree (void **ptr)
224 {
225 if (ptr == NULL)
226 return;
228 if (*ptr != NULL)
229 free (*ptr);
231 *ptr = NULL;
232 }
233 #endif
235 ssize_t sread (int fd, void *buf, size_t count)
236 {
237 char *ptr;
238 size_t nleft;
239 ssize_t status;
241 ptr = (char *) buf;
242 nleft = count;
244 while (nleft > 0)
245 {
246 status = read (fd, (void *) ptr, nleft);
248 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
249 continue;
251 if (status < 0)
252 return (status);
254 if (status == 0)
255 {
256 DEBUG ("Received EOF from fd %i. "
257 "Closing fd and returning error.",
258 fd);
259 close (fd);
260 return (-1);
261 }
263 assert ((0 > status) || (nleft >= (size_t)status));
265 nleft = nleft - ((size_t) status);
266 ptr = ptr + ((size_t) status);
267 }
269 return (0);
270 }
273 ssize_t swrite (int fd, const void *buf, size_t count)
274 {
275 const char *ptr;
276 size_t nleft;
277 ssize_t status;
278 struct pollfd pfd;
280 ptr = (const char *) buf;
281 nleft = count;
283 if (fd < 0)
284 return (-1);
286 /* checking for closed peer connection */
287 pfd.fd = fd;
288 pfd.events = POLLIN | POLLHUP;
289 pfd.revents = 0;
290 if (poll(&pfd, 1, 0) > 0) {
291 char buffer[32];
292 if (recv(fd, buffer, sizeof(buffer), MSG_PEEK | MSG_DONTWAIT) == 0) {
293 // if recv returns zero (even though poll() said there is data to be read),
294 // that means the connection has been closed
295 return -1;
296 }
297 }
299 while (nleft > 0)
300 {
301 status = write (fd, (const void *) ptr, nleft);
303 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
304 continue;
306 if (status < 0)
307 return (status);
309 nleft = nleft - ((size_t) status);
310 ptr = ptr + ((size_t) status);
311 }
313 return (0);
314 }
316 int strsplit (char *string, char **fields, size_t size)
317 {
318 size_t i;
319 char *ptr;
320 char *saveptr;
322 i = 0;
323 ptr = string;
324 saveptr = NULL;
325 while ((fields[i] = strtok_r (ptr, " \t\r\n", &saveptr)) != NULL)
326 {
327 ptr = NULL;
328 i++;
330 if (i >= size)
331 break;
332 }
334 return ((int) i);
335 }
337 int strjoin (char *buffer, size_t buffer_size,
338 char **fields, size_t fields_num,
339 const char *sep)
340 {
341 size_t avail;
342 char *ptr;
343 size_t sep_len;
345 if ((buffer_size < 1) || (fields_num == 0))
346 return (-1);
348 memset (buffer, 0, buffer_size);
349 ptr = buffer;
350 avail = buffer_size - 1;
352 sep_len = 0;
353 if (sep != NULL)
354 sep_len = strlen (sep);
356 for (size_t i = 0; i < fields_num; i++)
357 {
358 size_t field_len;
360 if ((i > 0) && (sep_len > 0))
361 {
362 if (avail < sep_len)
363 return (-1);
365 memcpy (ptr, sep, sep_len);
366 ptr += sep_len;
367 avail -= sep_len;
368 }
370 field_len = strlen (fields[i]);
371 if (avail < field_len)
372 return (-1);
374 memcpy (ptr, fields[i], field_len);
375 ptr += field_len;
376 avail -= field_len;
377 }
379 assert (buffer[buffer_size - 1] == 0);
380 return ((int) strlen (buffer));
381 }
383 int escape_string (char *buffer, size_t buffer_size)
384 {
385 char *temp;
386 size_t j;
388 /* Check if we need to escape at all first */
389 temp = strpbrk (buffer, " \t\"\\");
390 if (temp == NULL)
391 return (0);
393 if (buffer_size < 3)
394 return (EINVAL);
396 temp = calloc (1, buffer_size);
397 if (temp == NULL)
398 return (ENOMEM);
400 temp[0] = '"';
401 j = 1;
403 for (size_t i = 0; i < buffer_size; i++)
404 {
405 if (buffer[i] == 0)
406 {
407 break;
408 }
409 else if ((buffer[i] == '"') || (buffer[i] == '\\'))
410 {
411 if (j > (buffer_size - 4))
412 break;
413 temp[j] = '\\';
414 temp[j + 1] = buffer[i];
415 j += 2;
416 }
417 else
418 {
419 if (j > (buffer_size - 3))
420 break;
421 temp[j] = buffer[i];
422 j++;
423 }
424 }
426 assert ((j + 1) < buffer_size);
427 temp[j] = '"';
428 temp[j + 1] = 0;
430 sstrncpy (buffer, temp, buffer_size);
431 sfree (temp);
432 return (0);
433 } /* int escape_string */
435 int strunescape (char *buf, size_t buf_len)
436 {
437 for (size_t i = 0; (i < buf_len) && (buf[i] != '\0'); ++i)
438 {
439 if (buf[i] != '\\')
440 continue;
442 if (((i + 1) >= buf_len) || (buf[i + 1] == 0)) {
443 ERROR ("string unescape: backslash found at end of string.");
444 /* Ensure null-byte at the end of the buffer. */
445 buf[i] = 0;
446 return (-1);
447 }
449 switch (buf[i + 1]) {
450 case 't':
451 buf[i] = '\t';
452 break;
453 case 'n':
454 buf[i] = '\n';
455 break;
456 case 'r':
457 buf[i] = '\r';
458 break;
459 default:
460 buf[i] = buf[i + 1];
461 break;
462 }
464 /* Move everything after the position one position to the left.
465 * Add a null-byte as last character in the buffer. */
466 memmove (buf + i + 1, buf + i + 2, buf_len - i - 2);
467 buf[buf_len - 1] = 0;
468 }
469 return (0);
470 } /* int strunescape */
472 size_t strstripnewline (char *buffer)
473 {
474 size_t buffer_len = strlen (buffer);
476 while (buffer_len > 0)
477 {
478 if ((buffer[buffer_len - 1] != '\n')
479 && (buffer[buffer_len - 1] != '\r'))
480 break;
481 buffer_len--;
482 buffer[buffer_len] = 0;
483 }
485 return (buffer_len);
486 } /* size_t strstripnewline */
488 int escape_slashes (char *buffer, size_t buffer_size)
489 {
490 size_t buffer_len;
492 buffer_len = strlen (buffer);
494 if (buffer_len <= 1)
495 {
496 if (strcmp ("/", buffer) == 0)
497 {
498 if (buffer_size < 5)
499 return (-1);
500 sstrncpy (buffer, "root", buffer_size);
501 }
502 return (0);
503 }
505 /* Move one to the left */
506 if (buffer[0] == '/')
507 {
508 memmove (buffer, buffer + 1, buffer_len);
509 buffer_len--;
510 }
512 for (size_t i = 0; i < buffer_len; i++)
513 {
514 if (buffer[i] == '/')
515 buffer[i] = '_';
516 }
518 return (0);
519 } /* int escape_slashes */
521 void replace_special (char *buffer, size_t buffer_size)
522 {
523 for (size_t i = 0; i < buffer_size; i++)
524 {
525 if (buffer[i] == 0)
526 return;
527 if ((!isalnum ((int) buffer[i])) && (buffer[i] != '-'))
528 buffer[i] = '_';
529 }
530 } /* void replace_special */
532 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
533 {
534 struct timeval *larger;
535 struct timeval *smaller;
537 int status;
539 NORMALIZE_TIMEVAL (tv0);
540 NORMALIZE_TIMEVAL (tv1);
542 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
543 {
544 if (delta != NULL) {
545 delta->tv_sec = 0;
546 delta->tv_usec = 0;
547 }
548 return (0);
549 }
551 if ((tv0.tv_sec < tv1.tv_sec)
552 || ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
553 {
554 larger = &tv1;
555 smaller = &tv0;
556 status = -1;
557 }
558 else
559 {
560 larger = &tv0;
561 smaller = &tv1;
562 status = 1;
563 }
565 if (delta != NULL) {
566 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
568 if (smaller->tv_usec <= larger->tv_usec)
569 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
570 else
571 {
572 --delta->tv_sec;
573 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
574 }
575 }
577 assert ((delta == NULL)
578 || ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
580 return (status);
581 } /* int timeval_cmp */
583 int check_create_dir (const char *file_orig)
584 {
585 struct stat statbuf;
587 char file_copy[512];
588 char dir[512];
589 int dir_len = 512;
590 char *fields[16];
591 int fields_num;
592 char *ptr;
593 char *saveptr;
594 int last_is_file = 1;
595 int path_is_absolute = 0;
596 size_t len;
598 /*
599 * Sanity checks first
600 */
601 if (file_orig == NULL)
602 return (-1);
604 if ((len = strlen (file_orig)) < 1)
605 return (-1);
606 else if (len >= sizeof (file_copy))
607 return (-1);
609 /*
610 * If `file_orig' ends in a slash the last component is a directory,
611 * otherwise it's a file. Act accordingly..
612 */
613 if (file_orig[len - 1] == '/')
614 last_is_file = 0;
615 if (file_orig[0] == '/')
616 path_is_absolute = 1;
618 /*
619 * Create a copy for `strtok_r' to destroy
620 */
621 sstrncpy (file_copy, file_orig, sizeof (file_copy));
623 /*
624 * Break into components. This will eat up several slashes in a row and
625 * remove leading and trailing slashes..
626 */
627 ptr = file_copy;
628 saveptr = NULL;
629 fields_num = 0;
630 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
631 {
632 ptr = NULL;
633 fields_num++;
635 if (fields_num >= 16)
636 break;
637 }
639 /*
640 * For each component, do..
641 */
642 for (int i = 0; i < (fields_num - last_is_file); i++)
643 {
644 /*
645 * Do not create directories that start with a dot. This
646 * prevents `../../' attacks and other likely malicious
647 * behavior.
648 */
649 if (fields[i][0] == '.')
650 {
651 ERROR ("Cowardly refusing to create a directory that "
652 "begins with a `.' (dot): `%s'", file_orig);
653 return (-2);
654 }
656 /*
657 * Join the components together again
658 */
659 dir[0] = '/';
660 if (strjoin (dir + path_is_absolute, (size_t) (dir_len - path_is_absolute),
661 fields, (size_t) (i + 1), "/") < 0)
662 {
663 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
664 return (-1);
665 }
667 while (42) {
668 if ((stat (dir, &statbuf) == -1)
669 && (lstat (dir, &statbuf) == -1))
670 {
671 if (errno == ENOENT)
672 {
673 if (mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0)
674 break;
676 /* this might happen, if a different thread created
677 * the directory in the meantime
678 * => call stat() again to check for S_ISDIR() */
679 if (EEXIST == errno)
680 continue;
682 char errbuf[1024];
683 ERROR ("check_create_dir: mkdir (%s): %s", dir,
684 sstrerror (errno,
685 errbuf, sizeof (errbuf)));
686 return (-1);
687 }
688 else
689 {
690 char errbuf[1024];
691 ERROR ("check_create_dir: stat (%s): %s", dir,
692 sstrerror (errno, errbuf,
693 sizeof (errbuf)));
694 return (-1);
695 }
696 }
697 else if (!S_ISDIR (statbuf.st_mode))
698 {
699 ERROR ("check_create_dir: `%s' exists but is not "
700 "a directory!", dir);
701 return (-1);
702 }
703 break;
704 }
705 }
707 return (0);
708 } /* check_create_dir */
710 #ifdef HAVE_LIBKSTAT
711 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
712 {
713 char ident[128];
715 *ksp_ptr = NULL;
717 if (kc == NULL)
718 return (-1);
720 ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
722 *ksp_ptr = kstat_lookup (kc, module, instance, name);
723 if (*ksp_ptr == NULL)
724 {
725 ERROR ("get_kstat: Cound not find kstat %s", ident);
726 return (-1);
727 }
729 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
730 {
731 ERROR ("get_kstat: kstat %s has wrong type", ident);
732 *ksp_ptr = NULL;
733 return (-1);
734 }
736 #ifdef assert
737 assert (*ksp_ptr != NULL);
738 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
739 #endif
741 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
742 {
743 ERROR ("get_kstat: kstat %s could not be read", ident);
744 return (-1);
745 }
747 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
748 {
749 ERROR ("get_kstat: kstat %s has wrong type", ident);
750 return (-1);
751 }
753 return (0);
754 }
756 long long get_kstat_value (kstat_t *ksp, char *name)
757 {
758 kstat_named_t *kn;
759 long long retval = -1LL;
761 if (ksp == NULL)
762 {
763 ERROR ("get_kstat_value (\"%s\"): ksp is NULL.", name);
764 return (-1LL);
765 }
766 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
767 {
768 ERROR ("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
769 "is not KSTAT_TYPE_NAMED (%#x).",
770 name,
771 (unsigned int) ksp->ks_type,
772 (unsigned int) KSTAT_TYPE_NAMED);
773 return (-1LL);
774 }
776 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
777 return (-1LL);
779 if (kn->data_type == KSTAT_DATA_INT32)
780 retval = (long long) kn->value.i32;
781 else if (kn->data_type == KSTAT_DATA_UINT32)
782 retval = (long long) kn->value.ui32;
783 else if (kn->data_type == KSTAT_DATA_INT64)
784 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
785 else if (kn->data_type == KSTAT_DATA_UINT64)
786 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
787 else
788 WARNING ("get_kstat_value: Not a numeric value: %s", name);
790 return (retval);
791 }
792 #endif /* HAVE_LIBKSTAT */
794 #ifndef HAVE_HTONLL
795 unsigned long long ntohll (unsigned long long n)
796 {
797 #if BYTE_ORDER == BIG_ENDIAN
798 return (n);
799 #else
800 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
801 #endif
802 } /* unsigned long long ntohll */
804 unsigned long long htonll (unsigned long long n)
805 {
806 #if BYTE_ORDER == BIG_ENDIAN
807 return (n);
808 #else
809 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
810 #endif
811 } /* unsigned long long htonll */
812 #endif /* HAVE_HTONLL */
814 #if FP_LAYOUT_NEED_NOTHING
815 /* Well, we need nothing.. */
816 /* #endif FP_LAYOUT_NEED_NOTHING */
818 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
819 # if FP_LAYOUT_NEED_ENDIANFLIP
820 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
821 (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
822 (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
823 (((uint64_t)(A) & 0x000000ff00000000LL) >> 8) | \
824 (((uint64_t)(A) & 0x00000000ff000000LL) << 8) | \
825 (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
826 (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
827 (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
828 # else
829 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
830 (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
831 # endif
833 double ntohd (double d)
834 {
835 union
836 {
837 uint8_t byte[8];
838 uint64_t integer;
839 double floating;
840 } ret;
842 ret.floating = d;
844 /* NAN in x86 byte order */
845 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
846 && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
847 && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
848 && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
849 {
850 return (NAN);
851 }
852 else
853 {
854 uint64_t tmp;
856 tmp = ret.integer;
857 ret.integer = FP_CONVERT (tmp);
858 return (ret.floating);
859 }
860 } /* double ntohd */
862 double htond (double d)
863 {
864 union
865 {
866 uint8_t byte[8];
867 uint64_t integer;
868 double floating;
869 } ret;
871 if (isnan (d))
872 {
873 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
874 ret.byte[4] = ret.byte[5] = 0x00;
875 ret.byte[6] = 0xf8;
876 ret.byte[7] = 0x7f;
877 return (ret.floating);
878 }
879 else
880 {
881 uint64_t tmp;
883 ret.floating = d;
884 tmp = FP_CONVERT (ret.integer);
885 ret.integer = tmp;
886 return (ret.floating);
887 }
888 } /* double htond */
889 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
891 int format_name (char *ret, int ret_len,
892 const char *hostname,
893 const char *plugin, const char *plugin_instance,
894 const char *type, const char *type_instance)
895 {
896 char *buffer;
897 size_t buffer_size;
899 buffer = ret;
900 buffer_size = (size_t) ret_len;
902 #define APPEND(str) do { \
903 size_t l = strlen (str); \
904 if (l >= buffer_size) \
905 return (ENOBUFS); \
906 memcpy (buffer, (str), l); \
907 buffer += l; buffer_size -= l; \
908 } while (0)
910 assert (plugin != NULL);
911 assert (type != NULL);
913 APPEND (hostname);
914 APPEND ("/");
915 APPEND (plugin);
916 if ((plugin_instance != NULL) && (plugin_instance[0] != 0))
917 {
918 APPEND ("-");
919 APPEND (plugin_instance);
920 }
921 APPEND ("/");
922 APPEND (type);
923 if ((type_instance != NULL) && (type_instance[0] != 0))
924 {
925 APPEND ("-");
926 APPEND (type_instance);
927 }
928 assert (buffer_size > 0);
929 buffer[0] = 0;
931 #undef APPEND
932 return (0);
933 } /* int format_name */
935 int format_values (char *ret, size_t ret_len, /* {{{ */
936 const data_set_t *ds, const value_list_t *vl,
937 _Bool store_rates)
938 {
939 size_t offset = 0;
940 int status;
941 gauge_t *rates = NULL;
943 assert (0 == strcmp (ds->type, vl->type));
945 memset (ret, 0, ret_len);
947 #define BUFFER_ADD(...) do { \
948 status = ssnprintf (ret + offset, ret_len - offset, \
949 __VA_ARGS__); \
950 if (status < 1) \
951 { \
952 sfree (rates); \
953 return (-1); \
954 } \
955 else if (((size_t) status) >= (ret_len - offset)) \
956 { \
957 sfree (rates); \
958 return (-1); \
959 } \
960 else \
961 offset += ((size_t) status); \
962 } while (0)
964 BUFFER_ADD ("%.3f", CDTIME_T_TO_DOUBLE (vl->time));
966 for (size_t i = 0; i < ds->ds_num; i++)
967 {
968 if (ds->ds[i].type == DS_TYPE_GAUGE)
969 BUFFER_ADD (":"GAUGE_FORMAT, vl->values[i].gauge);
970 else if (store_rates)
971 {
972 if (rates == NULL)
973 rates = uc_get_rate (ds, vl);
974 if (rates == NULL)
975 {
976 WARNING ("format_values: uc_get_rate failed.");
977 return (-1);
978 }
979 BUFFER_ADD (":"GAUGE_FORMAT, rates[i]);
980 }
981 else if (ds->ds[i].type == DS_TYPE_COUNTER)
982 BUFFER_ADD (":%llu", vl->values[i].counter);
983 else if (ds->ds[i].type == DS_TYPE_DERIVE)
984 BUFFER_ADD (":%"PRIi64, vl->values[i].derive);
985 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
986 BUFFER_ADD (":%"PRIu64, vl->values[i].absolute);
987 else
988 {
989 ERROR ("format_values: Unknown data source type: %i",
990 ds->ds[i].type);
991 sfree (rates);
992 return (-1);
993 }
994 } /* for ds->ds_num */
996 #undef BUFFER_ADD
998 sfree (rates);
999 return (0);
1000 } /* }}} int format_values */
1002 int parse_identifier (char *str, char **ret_host,
1003 char **ret_plugin, char **ret_plugin_instance,
1004 char **ret_type, char **ret_type_instance)
1005 {
1006 char *hostname = NULL;
1007 char *plugin = NULL;
1008 char *plugin_instance = NULL;
1009 char *type = NULL;
1010 char *type_instance = NULL;
1012 hostname = str;
1013 if (hostname == NULL)
1014 return (-1);
1016 plugin = strchr (hostname, '/');
1017 if (plugin == NULL)
1018 return (-1);
1019 *plugin = '\0'; plugin++;
1021 type = strchr (plugin, '/');
1022 if (type == NULL)
1023 return (-1);
1024 *type = '\0'; type++;
1026 plugin_instance = strchr (plugin, '-');
1027 if (plugin_instance != NULL)
1028 {
1029 *plugin_instance = '\0';
1030 plugin_instance++;
1031 }
1033 type_instance = strchr (type, '-');
1034 if (type_instance != NULL)
1035 {
1036 *type_instance = '\0';
1037 type_instance++;
1038 }
1040 *ret_host = hostname;
1041 *ret_plugin = plugin;
1042 *ret_plugin_instance = plugin_instance;
1043 *ret_type = type;
1044 *ret_type_instance = type_instance;
1045 return (0);
1046 } /* int parse_identifier */
1048 int parse_identifier_vl (const char *str, value_list_t *vl) /* {{{ */
1049 {
1050 char str_copy[6 * DATA_MAX_NAME_LEN];
1051 char *host = NULL;
1052 char *plugin = NULL;
1053 char *plugin_instance = NULL;
1054 char *type = NULL;
1055 char *type_instance = NULL;
1056 int status;
1058 if ((str == NULL) || (vl == NULL))
1059 return (EINVAL);
1061 sstrncpy (str_copy, str, sizeof (str_copy));
1063 status = parse_identifier (str_copy, &host,
1064 &plugin, &plugin_instance,
1065 &type, &type_instance);
1066 if (status != 0)
1067 return (status);
1069 sstrncpy (vl->host, host, sizeof (vl->host));
1070 sstrncpy (vl->plugin, plugin, sizeof (vl->plugin));
1071 sstrncpy (vl->plugin_instance,
1072 (plugin_instance != NULL) ? plugin_instance : "",
1073 sizeof (vl->plugin_instance));
1074 sstrncpy (vl->type, type, sizeof (vl->type));
1075 sstrncpy (vl->type_instance,
1076 (type_instance != NULL) ? type_instance : "",
1077 sizeof (vl->type_instance));
1079 return (0);
1080 } /* }}} int parse_identifier_vl */
1082 int parse_value (const char *value_orig, value_t *ret_value, int ds_type)
1083 {
1084 char *value;
1085 char *endptr = NULL;
1086 size_t value_len;
1088 if (value_orig == NULL)
1089 return (EINVAL);
1091 value = strdup (value_orig);
1092 if (value == NULL)
1093 return (ENOMEM);
1094 value_len = strlen (value);
1096 while ((value_len > 0) && isspace ((int) value[value_len - 1]))
1097 {
1098 value[value_len - 1] = 0;
1099 value_len--;
1100 }
1102 switch (ds_type)
1103 {
1104 case DS_TYPE_COUNTER:
1105 ret_value->counter = (counter_t) strtoull (value, &endptr, 0);
1106 break;
1108 case DS_TYPE_GAUGE:
1109 ret_value->gauge = (gauge_t) strtod (value, &endptr);
1110 break;
1112 case DS_TYPE_DERIVE:
1113 ret_value->derive = (derive_t) strtoll (value, &endptr, 0);
1114 break;
1116 case DS_TYPE_ABSOLUTE:
1117 ret_value->absolute = (absolute_t) strtoull (value, &endptr, 0);
1118 break;
1120 default:
1121 sfree (value);
1122 ERROR ("parse_value: Invalid data source type: %i.", ds_type);
1123 return -1;
1124 }
1126 if (value == endptr) {
1127 ERROR ("parse_value: Failed to parse string as %s: %s.",
1128 DS_TYPE_TO_STRING (ds_type), value);
1129 sfree (value);
1130 return -1;
1131 }
1132 else if ((NULL != endptr) && ('\0' != *endptr))
1133 INFO ("parse_value: Ignoring trailing garbage \"%s\" after %s value. "
1134 "Input string was \"%s\".",
1135 endptr, DS_TYPE_TO_STRING (ds_type), value_orig);
1137 sfree (value);
1138 return 0;
1139 } /* int parse_value */
1141 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
1142 {
1143 size_t i;
1144 char *dummy;
1145 char *ptr;
1146 char *saveptr;
1148 if ((buffer == NULL) || (vl == NULL) || (ds == NULL))
1149 return EINVAL;
1151 i = 0;
1152 dummy = buffer;
1153 saveptr = NULL;
1154 vl->time = 0;
1155 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
1156 {
1157 dummy = NULL;
1159 if (i >= vl->values_len)
1160 {
1161 /* Make sure i is invalid. */
1162 i = 0;
1163 break;
1164 }
1166 if (vl->time == 0)
1167 {
1168 if (strcmp ("N", ptr) == 0)
1169 vl->time = cdtime ();
1170 else
1171 {
1172 char *endptr = NULL;
1173 double tmp;
1175 errno = 0;
1176 tmp = strtod (ptr, &endptr);
1177 if ((errno != 0) /* Overflow */
1178 || (endptr == ptr) /* Invalid string */
1179 || (endptr == NULL) /* This should not happen */
1180 || (*endptr != 0)) /* Trailing chars */
1181 return (-1);
1183 vl->time = DOUBLE_TO_CDTIME_T (tmp);
1184 }
1186 continue;
1187 }
1189 if ((strcmp ("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
1190 vl->values[i].gauge = NAN;
1191 else if (0 != parse_value (ptr, &vl->values[i], ds->ds[i].type))
1192 return -1;
1194 i++;
1195 } /* while (strtok_r) */
1197 if ((ptr != NULL) || (i == 0))
1198 return (-1);
1199 return (0);
1200 } /* int parse_values */
1202 int parse_value_file (char const *path, value_t *ret_value, int ds_type)
1203 {
1204 char buffer[256];
1206 if (read_file_contents (path, buffer, sizeof (buffer)) < 0)
1207 return errno;
1209 strstripnewline (buffer);
1211 return parse_value (buffer, ret_value, ds_type);
1212 } /* int parse_value_file */
1214 #if !HAVE_GETPWNAM_R
1215 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
1216 size_t buflen, struct passwd **pwbufp)
1217 {
1218 int status = 0;
1219 struct passwd *pw;
1221 memset (pwbuf, '\0', sizeof (struct passwd));
1223 pthread_mutex_lock (&getpwnam_r_lock);
1225 do
1226 {
1227 pw = getpwnam (name);
1228 if (pw == NULL)
1229 {
1230 status = (errno != 0) ? errno : ENOENT;
1231 break;
1232 }
1234 #define GETPWNAM_COPY_MEMBER(member) \
1235 if (pw->member != NULL) \
1236 { \
1237 int len = strlen (pw->member); \
1238 if (len >= buflen) \
1239 { \
1240 status = ENOMEM; \
1241 break; \
1242 } \
1243 sstrncpy (buf, pw->member, buflen); \
1244 pwbuf->member = buf; \
1245 buf += (len + 1); \
1246 buflen -= (len + 1); \
1247 }
1248 GETPWNAM_COPY_MEMBER(pw_name);
1249 GETPWNAM_COPY_MEMBER(pw_passwd);
1250 GETPWNAM_COPY_MEMBER(pw_gecos);
1251 GETPWNAM_COPY_MEMBER(pw_dir);
1252 GETPWNAM_COPY_MEMBER(pw_shell);
1254 pwbuf->pw_uid = pw->pw_uid;
1255 pwbuf->pw_gid = pw->pw_gid;
1257 if (pwbufp != NULL)
1258 *pwbufp = pwbuf;
1259 } while (0);
1261 pthread_mutex_unlock (&getpwnam_r_lock);
1263 return (status);
1264 } /* int getpwnam_r */
1265 #endif /* !HAVE_GETPWNAM_R */
1267 int notification_init (notification_t *n, int severity, const char *message,
1268 const char *host,
1269 const char *plugin, const char *plugin_instance,
1270 const char *type, const char *type_instance)
1271 {
1272 memset (n, '\0', sizeof (notification_t));
1274 n->severity = severity;
1276 if (message != NULL)
1277 sstrncpy (n->message, message, sizeof (n->message));
1278 if (host != NULL)
1279 sstrncpy (n->host, host, sizeof (n->host));
1280 if (plugin != NULL)
1281 sstrncpy (n->plugin, plugin, sizeof (n->plugin));
1282 if (plugin_instance != NULL)
1283 sstrncpy (n->plugin_instance, plugin_instance,
1284 sizeof (n->plugin_instance));
1285 if (type != NULL)
1286 sstrncpy (n->type, type, sizeof (n->type));
1287 if (type_instance != NULL)
1288 sstrncpy (n->type_instance, type_instance,
1289 sizeof (n->type_instance));
1291 return (0);
1292 } /* int notification_init */
1294 int walk_directory (const char *dir, dirwalk_callback_f callback,
1295 void *user_data, int include_hidden)
1296 {
1297 struct dirent *ent;
1298 DIR *dh;
1299 int success;
1300 int failure;
1302 success = 0;
1303 failure = 0;
1305 if ((dh = opendir (dir)) == NULL)
1306 {
1307 char errbuf[1024];
1308 ERROR ("walk_directory: Cannot open '%s': %s", dir,
1309 sstrerror (errno, errbuf, sizeof (errbuf)));
1310 return -1;
1311 }
1313 while ((ent = readdir (dh)) != NULL)
1314 {
1315 int status;
1317 if (include_hidden)
1318 {
1319 if ((strcmp (".", ent->d_name) == 0)
1320 || (strcmp ("..", ent->d_name) == 0))
1321 continue;
1322 }
1323 else /* if (!include_hidden) */
1324 {
1325 if (ent->d_name[0]=='.')
1326 continue;
1327 }
1329 status = (*callback) (dir, ent->d_name, user_data);
1330 if (status != 0)
1331 failure++;
1332 else
1333 success++;
1334 }
1336 closedir (dh);
1338 if ((success == 0) && (failure > 0))
1339 return (-1);
1340 return (0);
1341 }
1343 ssize_t read_file_contents (const char *filename, char *buf, size_t bufsize)
1344 {
1345 FILE *fh;
1346 ssize_t ret;
1348 fh = fopen (filename, "r");
1349 if (fh == NULL)
1350 return (-1);
1352 ret = (ssize_t) fread (buf, 1, bufsize, fh);
1353 if ((ret == 0) && (ferror (fh) != 0))
1354 {
1355 ERROR ("read_file_contents: Reading file \"%s\" failed.",
1356 filename);
1357 ret = -1;
1358 }
1360 fclose(fh);
1361 return (ret);
1362 }
1364 counter_t counter_diff (counter_t old_value, counter_t new_value)
1365 {
1366 counter_t diff;
1368 if (old_value > new_value)
1369 {
1370 if (old_value <= 4294967295U)
1371 diff = (4294967295U - old_value) + new_value + 1;
1372 else
1373 diff = (18446744073709551615ULL - old_value) + new_value + 1;
1374 }
1375 else
1376 {
1377 diff = new_value - old_value;
1378 }
1380 return (diff);
1381 } /* counter_t counter_diff */
1383 int rate_to_value (value_t *ret_value, gauge_t rate, /* {{{ */
1384 rate_to_value_state_t *state,
1385 int ds_type, cdtime_t t)
1386 {
1387 gauge_t delta_gauge;
1388 cdtime_t delta_t;
1390 if (ds_type == DS_TYPE_GAUGE)
1391 {
1392 state->last_value.gauge = rate;
1393 state->last_time = t;
1395 *ret_value = state->last_value;
1396 return (0);
1397 }
1399 /* Counter and absolute can't handle negative rates. Reset "last time"
1400 * to zero, so that the next valid rate will re-initialize the
1401 * structure. */
1402 if ((rate < 0.0)
1403 && ((ds_type == DS_TYPE_COUNTER)
1404 || (ds_type == DS_TYPE_ABSOLUTE)))
1405 {
1406 memset (state, 0, sizeof (*state));
1407 return (EINVAL);
1408 }
1410 /* Another invalid state: The time is not increasing. */
1411 if (t <= state->last_time)
1412 {
1413 memset (state, 0, sizeof (*state));
1414 return (EINVAL);
1415 }
1417 delta_t = t - state->last_time;
1418 delta_gauge = (rate * CDTIME_T_TO_DOUBLE (delta_t)) + state->residual;
1420 /* Previous value is invalid. */
1421 if (state->last_time == 0) /* {{{ */
1422 {
1423 if (ds_type == DS_TYPE_DERIVE)
1424 {
1425 state->last_value.derive = (derive_t) rate;
1426 state->residual = rate - ((gauge_t) state->last_value.derive);
1427 }
1428 else if (ds_type == DS_TYPE_COUNTER)
1429 {
1430 state->last_value.counter = (counter_t) rate;
1431 state->residual = rate - ((gauge_t) state->last_value.counter);
1432 }
1433 else if (ds_type == DS_TYPE_ABSOLUTE)
1434 {
1435 state->last_value.absolute = (absolute_t) rate;
1436 state->residual = rate - ((gauge_t) state->last_value.absolute);
1437 }
1438 else
1439 {
1440 assert (23 == 42);
1441 }
1443 state->last_time = t;
1444 return (EAGAIN);
1445 } /* }}} */
1447 if (ds_type == DS_TYPE_DERIVE)
1448 {
1449 derive_t delta_derive = (derive_t) delta_gauge;
1451 state->last_value.derive += delta_derive;
1452 state->residual = delta_gauge - ((gauge_t) delta_derive);
1453 }
1454 else if (ds_type == DS_TYPE_COUNTER)
1455 {
1456 counter_t delta_counter = (counter_t) delta_gauge;
1458 state->last_value.counter += delta_counter;
1459 state->residual = delta_gauge - ((gauge_t) delta_counter);
1460 }
1461 else if (ds_type == DS_TYPE_ABSOLUTE)
1462 {
1463 absolute_t delta_absolute = (absolute_t) delta_gauge;
1465 state->last_value.absolute = delta_absolute;
1466 state->residual = delta_gauge - ((gauge_t) delta_absolute);
1467 }
1468 else
1469 {
1470 assert (23 == 42);
1471 }
1473 state->last_time = t;
1474 *ret_value = state->last_value;
1475 return (0);
1476 } /* }}} value_t rate_to_value */
1478 int value_to_rate (gauge_t *ret_rate, /* {{{ */
1479 value_t value, int ds_type, cdtime_t t, value_to_rate_state_t *state)
1480 {
1481 gauge_t interval;
1483 /* Another invalid state: The time is not increasing. */
1484 if (t <= state->last_time)
1485 {
1486 memset (state, 0, sizeof (*state));
1487 return (EINVAL);
1488 }
1490 interval = CDTIME_T_TO_DOUBLE(t - state->last_time);
1492 /* Previous value is invalid. */
1493 if (state->last_time == 0)
1494 {
1495 state->last_value = value;
1496 state->last_time = t;
1497 return (EAGAIN);
1498 }
1500 switch (ds_type) {
1501 case DS_TYPE_DERIVE: {
1502 derive_t diff = value.derive - state->last_value.derive;
1503 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1504 break;
1505 }
1506 case DS_TYPE_GAUGE: {
1507 *ret_rate = value.gauge;
1508 break;
1509 }
1510 case DS_TYPE_COUNTER: {
1511 counter_t diff = counter_diff (state->last_value.counter, value.counter);
1512 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1513 break;
1514 }
1515 case DS_TYPE_ABSOLUTE: {
1516 absolute_t diff = value.absolute;
1517 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1518 break;
1519 }
1520 default:
1521 return EINVAL;
1522 }
1524 state->last_value = value;
1525 state->last_time = t;
1526 return (0);
1527 } /* }}} value_t rate_to_value */
1529 int service_name_to_port_number (const char *service_name)
1530 {
1531 struct addrinfo *ai_list;
1532 int status;
1533 int service_number;
1535 if (service_name == NULL)
1536 return (-1);
1538 struct addrinfo ai_hints = {
1539 .ai_family = AF_UNSPEC
1540 };
1542 status = getaddrinfo (/* node = */ NULL, service_name,
1543 &ai_hints, &ai_list);
1544 if (status != 0)
1545 {
1546 ERROR ("service_name_to_port_number: getaddrinfo failed: %s",
1547 gai_strerror (status));
1548 return (-1);
1549 }
1551 service_number = -1;
1552 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1553 {
1554 if (ai_ptr->ai_family == AF_INET)
1555 {
1556 struct sockaddr_in *sa;
1558 sa = (void *) ai_ptr->ai_addr;
1559 service_number = (int) ntohs (sa->sin_port);
1560 }
1561 else if (ai_ptr->ai_family == AF_INET6)
1562 {
1563 struct sockaddr_in6 *sa;
1565 sa = (void *) ai_ptr->ai_addr;
1566 service_number = (int) ntohs (sa->sin6_port);
1567 }
1569 if ((service_number > 0) && (service_number <= 65535))
1570 break;
1571 }
1573 freeaddrinfo (ai_list);
1575 if ((service_number > 0) && (service_number <= 65535))
1576 return (service_number);
1577 return (-1);
1578 } /* int service_name_to_port_number */
1580 void set_sock_opts (int sockfd) /* {{{ */
1581 {
1582 int status;
1583 int socktype;
1585 socklen_t socklen = sizeof (socklen_t);
1586 int so_keepalive = 1;
1588 status = getsockopt (sockfd, SOL_SOCKET, SO_TYPE, &socktype, &socklen);
1589 if (status != 0)
1590 {
1591 WARNING ("set_sock_opts: failed to determine socket type");
1592 return;
1593 }
1595 if (socktype == SOCK_STREAM)
1596 {
1597 status = setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE,
1598 &so_keepalive, sizeof (so_keepalive));
1599 if (status != 0)
1600 WARNING ("set_sock_opts: failed to set socket keepalive flag");
1602 #ifdef TCP_KEEPIDLE
1603 int tcp_keepidle = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 100 + 1);
1604 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE,
1605 &tcp_keepidle, sizeof (tcp_keepidle));
1606 if (status != 0)
1607 WARNING ("set_sock_opts: failed to set socket tcp keepalive time");
1608 #endif
1610 #ifdef TCP_KEEPINTVL
1611 int tcp_keepintvl = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 1000 + 1);
1612 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL,
1613 &tcp_keepintvl, sizeof (tcp_keepintvl));
1614 if (status != 0)
1615 WARNING ("set_sock_opts: failed to set socket tcp keepalive interval");
1616 #endif
1617 }
1618 } /* }}} void set_sock_opts */
1620 int strtoderive (const char *string, derive_t *ret_value) /* {{{ */
1621 {
1622 derive_t tmp;
1623 char *endptr;
1625 if ((string == NULL) || (ret_value == NULL))
1626 return (EINVAL);
1628 errno = 0;
1629 endptr = NULL;
1630 tmp = (derive_t) strtoll (string, &endptr, /* base = */ 0);
1631 if ((endptr == string) || (errno != 0))
1632 return (-1);
1634 *ret_value = tmp;
1635 return (0);
1636 } /* }}} int strtoderive */
1638 int strtogauge (const char *string, gauge_t *ret_value) /* {{{ */
1639 {
1640 gauge_t tmp;
1641 char *endptr = NULL;
1643 if ((string == NULL) || (ret_value == NULL))
1644 return (EINVAL);
1646 errno = 0;
1647 endptr = NULL;
1648 tmp = (gauge_t) strtod (string, &endptr);
1649 if (errno != 0)
1650 return (errno);
1651 else if ((endptr == NULL) || (*endptr != 0))
1652 return (EINVAL);
1654 *ret_value = tmp;
1655 return (0);
1656 } /* }}} int strtogauge */
1658 int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str) /* {{{ */
1659 {
1660 char **array;
1661 size_t array_len = *ret_array_len;
1663 if (str == NULL)
1664 return (EINVAL);
1666 array = realloc (*ret_array,
1667 (array_len + 1) * sizeof (*array));
1668 if (array == NULL)
1669 return (ENOMEM);
1670 *ret_array = array;
1672 array[array_len] = strdup (str);
1673 if (array[array_len] == NULL)
1674 return (ENOMEM);
1676 array_len++;
1677 *ret_array_len = array_len;
1678 return (0);
1679 } /* }}} int strarray_add */
1681 void strarray_free (char **array, size_t array_len) /* {{{ */
1682 {
1683 for (size_t i = 0; i < array_len; i++)
1684 sfree (array[i]);
1685 sfree (array);
1686 } /* }}} void strarray_free */
1688 #ifdef HAVE_SYS_CAPABILITY_H
1689 int check_capability (int capability) /* {{{ */
1690 {
1691 #ifdef _LINUX_CAPABILITY_VERSION_3
1692 cap_user_header_t cap_header = calloc(1, sizeof (*cap_header));
1693 if (cap_header == NULL)
1694 {
1695 ERROR("check_capability: calloc failed");
1696 return (-1);
1697 }
1699 cap_user_data_t cap_data = calloc(1, sizeof (*cap_data));
1700 if (cap_data == NULL)
1701 {
1702 ERROR("check_capability: calloc failed");
1703 sfree(cap_header);
1704 return (-1);
1705 }
1707 cap_header->pid = getpid();
1708 cap_header->version = _LINUX_CAPABILITY_VERSION;
1709 if (capget(cap_header, cap_data) < 0)
1710 {
1711 ERROR("check_capability: capget failed");
1712 sfree(cap_header);
1713 sfree(cap_data);
1714 return (-1);
1715 }
1717 if ((cap_data->effective & (1 << capability)) == 0)
1718 {
1719 sfree(cap_header);
1720 sfree(cap_data);
1721 return (-1);
1722 }
1723 else
1724 {
1725 sfree(cap_header);
1726 sfree(cap_data);
1727 return (0);
1728 }
1729 #else
1730 WARNING ("check_capability: unsupported capability implementation. "
1731 "Some plugin(s) may require elevated privileges to work properly.");
1732 return (0);
1733 #endif /* _LINUX_CAPABILITY_VERSION_3 */
1734 } /* }}} int check_capability */
1735 #endif /* HAVE_SYS_CAPABILITY_H */