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 }
369 if (avail == 0)
370 return (-1);
372 field_len = strlen (fields[i]);
373 if (avail < field_len)
374 field_len = avail;
376 memcpy (ptr, fields[i], field_len);
377 ptr += field_len;
378 avail -= field_len;
379 }
381 assert (buffer[buffer_size - 1] == 0);
382 return ((int) ((buffer_size - 1) - avail));
383 }
385 int escape_string (char *buffer, size_t buffer_size)
386 {
387 char *temp;
388 size_t j;
390 /* Check if we need to escape at all first */
391 temp = strpbrk (buffer, " \t\"\\");
392 if (temp == NULL)
393 return (0);
395 if (buffer_size < 3)
396 return (EINVAL);
398 temp = calloc (1, buffer_size);
399 if (temp == NULL)
400 return (ENOMEM);
402 temp[0] = '"';
403 j = 1;
405 for (size_t i = 0; i < buffer_size; i++)
406 {
407 if (buffer[i] == 0)
408 {
409 break;
410 }
411 else if ((buffer[i] == '"') || (buffer[i] == '\\'))
412 {
413 if (j > (buffer_size - 4))
414 break;
415 temp[j] = '\\';
416 temp[j + 1] = buffer[i];
417 j += 2;
418 }
419 else
420 {
421 if (j > (buffer_size - 3))
422 break;
423 temp[j] = buffer[i];
424 j++;
425 }
426 }
428 assert ((j + 1) < buffer_size);
429 temp[j] = '"';
430 temp[j + 1] = 0;
432 sstrncpy (buffer, temp, buffer_size);
433 sfree (temp);
434 return (0);
435 } /* int escape_string */
437 int strunescape (char *buf, size_t buf_len)
438 {
439 for (size_t i = 0; (i < buf_len) && (buf[i] != '\0'); ++i)
440 {
441 if (buf[i] != '\\')
442 continue;
444 if (((i + 1) >= buf_len) || (buf[i + 1] == 0)) {
445 ERROR ("string unescape: backslash found at end of string.");
446 /* Ensure null-byte at the end of the buffer. */
447 buf[i] = 0;
448 return (-1);
449 }
451 switch (buf[i + 1]) {
452 case 't':
453 buf[i] = '\t';
454 break;
455 case 'n':
456 buf[i] = '\n';
457 break;
458 case 'r':
459 buf[i] = '\r';
460 break;
461 default:
462 buf[i] = buf[i + 1];
463 break;
464 }
466 /* Move everything after the position one position to the left.
467 * Add a null-byte as last character in the buffer. */
468 memmove (buf + i + 1, buf + i + 2, buf_len - i - 2);
469 buf[buf_len - 1] = 0;
470 }
471 return (0);
472 } /* int strunescape */
474 size_t strstripnewline (char *buffer)
475 {
476 size_t buffer_len = strlen (buffer);
478 while (buffer_len > 0)
479 {
480 if ((buffer[buffer_len - 1] != '\n')
481 && (buffer[buffer_len - 1] != '\r'))
482 break;
483 buffer_len--;
484 buffer[buffer_len] = 0;
485 }
487 return (buffer_len);
488 } /* size_t strstripnewline */
490 int escape_slashes (char *buffer, size_t buffer_size)
491 {
492 size_t buffer_len;
494 buffer_len = strlen (buffer);
496 if (buffer_len <= 1)
497 {
498 if (strcmp ("/", buffer) == 0)
499 {
500 if (buffer_size < 5)
501 return (-1);
502 sstrncpy (buffer, "root", buffer_size);
503 }
504 return (0);
505 }
507 /* Move one to the left */
508 if (buffer[0] == '/')
509 {
510 memmove (buffer, buffer + 1, buffer_len);
511 buffer_len--;
512 }
514 for (size_t i = 0; i < buffer_len; i++)
515 {
516 if (buffer[i] == '/')
517 buffer[i] = '_';
518 }
520 return (0);
521 } /* int escape_slashes */
523 void replace_special (char *buffer, size_t buffer_size)
524 {
525 for (size_t i = 0; i < buffer_size; i++)
526 {
527 if (buffer[i] == 0)
528 return;
529 if ((!isalnum ((int) buffer[i])) && (buffer[i] != '-'))
530 buffer[i] = '_';
531 }
532 } /* void replace_special */
534 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
535 {
536 struct timeval *larger;
537 struct timeval *smaller;
539 int status;
541 NORMALIZE_TIMEVAL (tv0);
542 NORMALIZE_TIMEVAL (tv1);
544 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
545 {
546 if (delta != NULL) {
547 delta->tv_sec = 0;
548 delta->tv_usec = 0;
549 }
550 return (0);
551 }
553 if ((tv0.tv_sec < tv1.tv_sec)
554 || ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
555 {
556 larger = &tv1;
557 smaller = &tv0;
558 status = -1;
559 }
560 else
561 {
562 larger = &tv0;
563 smaller = &tv1;
564 status = 1;
565 }
567 if (delta != NULL) {
568 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
570 if (smaller->tv_usec <= larger->tv_usec)
571 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
572 else
573 {
574 --delta->tv_sec;
575 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
576 }
577 }
579 assert ((delta == NULL)
580 || ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
582 return (status);
583 } /* int timeval_cmp */
585 int check_create_dir (const char *file_orig)
586 {
587 struct stat statbuf;
589 char file_copy[512];
590 char dir[512];
591 int dir_len = 512;
592 char *fields[16];
593 int fields_num;
594 char *ptr;
595 char *saveptr;
596 int last_is_file = 1;
597 int path_is_absolute = 0;
598 size_t len;
600 /*
601 * Sanity checks first
602 */
603 if (file_orig == NULL)
604 return (-1);
606 if ((len = strlen (file_orig)) < 1)
607 return (-1);
608 else if (len >= sizeof (file_copy))
609 return (-1);
611 /*
612 * If `file_orig' ends in a slash the last component is a directory,
613 * otherwise it's a file. Act accordingly..
614 */
615 if (file_orig[len - 1] == '/')
616 last_is_file = 0;
617 if (file_orig[0] == '/')
618 path_is_absolute = 1;
620 /*
621 * Create a copy for `strtok_r' to destroy
622 */
623 sstrncpy (file_copy, file_orig, sizeof (file_copy));
625 /*
626 * Break into components. This will eat up several slashes in a row and
627 * remove leading and trailing slashes..
628 */
629 ptr = file_copy;
630 saveptr = NULL;
631 fields_num = 0;
632 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
633 {
634 ptr = NULL;
635 fields_num++;
637 if (fields_num >= 16)
638 break;
639 }
641 /*
642 * For each component, do..
643 */
644 for (int i = 0; i < (fields_num - last_is_file); i++)
645 {
646 /*
647 * Do not create directories that start with a dot. This
648 * prevents `../../' attacks and other likely malicious
649 * behavior.
650 */
651 if (fields[i][0] == '.')
652 {
653 ERROR ("Cowardly refusing to create a directory that "
654 "begins with a `.' (dot): `%s'", file_orig);
655 return (-2);
656 }
658 /*
659 * Join the components together again
660 */
661 dir[0] = '/';
662 if (strjoin (dir + path_is_absolute, (size_t) (dir_len - path_is_absolute),
663 fields, (size_t) (i + 1), "/") < 0)
664 {
665 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
666 return (-1);
667 }
669 while (42) {
670 if ((stat (dir, &statbuf) == -1)
671 && (lstat (dir, &statbuf) == -1))
672 {
673 if (errno == ENOENT)
674 {
675 if (mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0)
676 break;
678 /* this might happen, if a different thread created
679 * the directory in the meantime
680 * => call stat() again to check for S_ISDIR() */
681 if (EEXIST == errno)
682 continue;
684 char errbuf[1024];
685 ERROR ("check_create_dir: mkdir (%s): %s", dir,
686 sstrerror (errno,
687 errbuf, sizeof (errbuf)));
688 return (-1);
689 }
690 else
691 {
692 char errbuf[1024];
693 ERROR ("check_create_dir: stat (%s): %s", dir,
694 sstrerror (errno, errbuf,
695 sizeof (errbuf)));
696 return (-1);
697 }
698 }
699 else if (!S_ISDIR (statbuf.st_mode))
700 {
701 ERROR ("check_create_dir: `%s' exists but is not "
702 "a directory!", dir);
703 return (-1);
704 }
705 break;
706 }
707 }
709 return (0);
710 } /* check_create_dir */
712 #ifdef HAVE_LIBKSTAT
713 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
714 {
715 char ident[128];
717 *ksp_ptr = NULL;
719 if (kc == NULL)
720 return (-1);
722 ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
724 *ksp_ptr = kstat_lookup (kc, module, instance, name);
725 if (*ksp_ptr == NULL)
726 {
727 ERROR ("get_kstat: Cound not find kstat %s", ident);
728 return (-1);
729 }
731 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
732 {
733 ERROR ("get_kstat: kstat %s has wrong type", ident);
734 *ksp_ptr = NULL;
735 return (-1);
736 }
738 #ifdef assert
739 assert (*ksp_ptr != NULL);
740 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
741 #endif
743 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
744 {
745 ERROR ("get_kstat: kstat %s could not be read", ident);
746 return (-1);
747 }
749 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
750 {
751 ERROR ("get_kstat: kstat %s has wrong type", ident);
752 return (-1);
753 }
755 return (0);
756 }
758 long long get_kstat_value (kstat_t *ksp, char *name)
759 {
760 kstat_named_t *kn;
761 long long retval = -1LL;
763 if (ksp == NULL)
764 {
765 ERROR ("get_kstat_value (\"%s\"): ksp is NULL.", name);
766 return (-1LL);
767 }
768 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
769 {
770 ERROR ("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
771 "is not KSTAT_TYPE_NAMED (%#x).",
772 name,
773 (unsigned int) ksp->ks_type,
774 (unsigned int) KSTAT_TYPE_NAMED);
775 return (-1LL);
776 }
778 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
779 return (-1LL);
781 if (kn->data_type == KSTAT_DATA_INT32)
782 retval = (long long) kn->value.i32;
783 else if (kn->data_type == KSTAT_DATA_UINT32)
784 retval = (long long) kn->value.ui32;
785 else if (kn->data_type == KSTAT_DATA_INT64)
786 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
787 else if (kn->data_type == KSTAT_DATA_UINT64)
788 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
789 else
790 WARNING ("get_kstat_value: Not a numeric value: %s", name);
792 return (retval);
793 }
794 #endif /* HAVE_LIBKSTAT */
796 #ifndef HAVE_HTONLL
797 unsigned long long ntohll (unsigned long long n)
798 {
799 #if BYTE_ORDER == BIG_ENDIAN
800 return (n);
801 #else
802 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
803 #endif
804 } /* unsigned long long ntohll */
806 unsigned long long htonll (unsigned long long n)
807 {
808 #if BYTE_ORDER == BIG_ENDIAN
809 return (n);
810 #else
811 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
812 #endif
813 } /* unsigned long long htonll */
814 #endif /* HAVE_HTONLL */
816 #if FP_LAYOUT_NEED_NOTHING
817 /* Well, we need nothing.. */
818 /* #endif FP_LAYOUT_NEED_NOTHING */
820 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
821 # if FP_LAYOUT_NEED_ENDIANFLIP
822 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
823 (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
824 (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
825 (((uint64_t)(A) & 0x000000ff00000000LL) >> 8) | \
826 (((uint64_t)(A) & 0x00000000ff000000LL) << 8) | \
827 (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
828 (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
829 (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
830 # else
831 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
832 (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
833 # endif
835 double ntohd (double d)
836 {
837 union
838 {
839 uint8_t byte[8];
840 uint64_t integer;
841 double floating;
842 } ret;
844 ret.floating = d;
846 /* NAN in x86 byte order */
847 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
848 && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
849 && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
850 && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
851 {
852 return (NAN);
853 }
854 else
855 {
856 uint64_t tmp;
858 tmp = ret.integer;
859 ret.integer = FP_CONVERT (tmp);
860 return (ret.floating);
861 }
862 } /* double ntohd */
864 double htond (double d)
865 {
866 union
867 {
868 uint8_t byte[8];
869 uint64_t integer;
870 double floating;
871 } ret;
873 if (isnan (d))
874 {
875 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
876 ret.byte[4] = ret.byte[5] = 0x00;
877 ret.byte[6] = 0xf8;
878 ret.byte[7] = 0x7f;
879 return (ret.floating);
880 }
881 else
882 {
883 uint64_t tmp;
885 ret.floating = d;
886 tmp = FP_CONVERT (ret.integer);
887 ret.integer = tmp;
888 return (ret.floating);
889 }
890 } /* double htond */
891 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
893 int format_name (char *ret, int ret_len,
894 const char *hostname,
895 const char *plugin, const char *plugin_instance,
896 const char *type, const char *type_instance)
897 {
898 char *buffer;
899 size_t buffer_size;
901 buffer = ret;
902 buffer_size = (size_t) ret_len;
904 #define APPEND(str) do { \
905 size_t l = strlen (str); \
906 if (l >= buffer_size) \
907 return (ENOBUFS); \
908 memcpy (buffer, (str), l); \
909 buffer += l; buffer_size -= l; \
910 } while (0)
912 assert (plugin != NULL);
913 assert (type != NULL);
915 APPEND (hostname);
916 APPEND ("/");
917 APPEND (plugin);
918 if ((plugin_instance != NULL) && (plugin_instance[0] != 0))
919 {
920 APPEND ("-");
921 APPEND (plugin_instance);
922 }
923 APPEND ("/");
924 APPEND (type);
925 if ((type_instance != NULL) && (type_instance[0] != 0))
926 {
927 APPEND ("-");
928 APPEND (type_instance);
929 }
930 assert (buffer_size > 0);
931 buffer[0] = 0;
933 #undef APPEND
934 return (0);
935 } /* int format_name */
937 int format_values (char *ret, size_t ret_len, /* {{{ */
938 const data_set_t *ds, const value_list_t *vl,
939 _Bool store_rates)
940 {
941 size_t offset = 0;
942 int status;
943 gauge_t *rates = NULL;
945 assert (0 == strcmp (ds->type, vl->type));
947 memset (ret, 0, ret_len);
949 #define BUFFER_ADD(...) do { \
950 status = ssnprintf (ret + offset, ret_len - offset, \
951 __VA_ARGS__); \
952 if (status < 1) \
953 { \
954 sfree (rates); \
955 return (-1); \
956 } \
957 else if (((size_t) status) >= (ret_len - offset)) \
958 { \
959 sfree (rates); \
960 return (-1); \
961 } \
962 else \
963 offset += ((size_t) status); \
964 } while (0)
966 BUFFER_ADD ("%.3f", CDTIME_T_TO_DOUBLE (vl->time));
968 for (size_t i = 0; i < ds->ds_num; i++)
969 {
970 if (ds->ds[i].type == DS_TYPE_GAUGE)
971 BUFFER_ADD (":"GAUGE_FORMAT, vl->values[i].gauge);
972 else if (store_rates)
973 {
974 if (rates == NULL)
975 rates = uc_get_rate (ds, vl);
976 if (rates == NULL)
977 {
978 WARNING ("format_values: uc_get_rate failed.");
979 return (-1);
980 }
981 BUFFER_ADD (":"GAUGE_FORMAT, rates[i]);
982 }
983 else if (ds->ds[i].type == DS_TYPE_COUNTER)
984 BUFFER_ADD (":%llu", vl->values[i].counter);
985 else if (ds->ds[i].type == DS_TYPE_DERIVE)
986 BUFFER_ADD (":%"PRIi64, vl->values[i].derive);
987 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
988 BUFFER_ADD (":%"PRIu64, vl->values[i].absolute);
989 else
990 {
991 ERROR ("format_values: Unknown data source type: %i",
992 ds->ds[i].type);
993 sfree (rates);
994 return (-1);
995 }
996 } /* for ds->ds_num */
998 #undef BUFFER_ADD
1000 sfree (rates);
1001 return (0);
1002 } /* }}} int format_values */
1004 int parse_identifier (char *str, char **ret_host,
1005 char **ret_plugin, char **ret_plugin_instance,
1006 char **ret_type, char **ret_type_instance)
1007 {
1008 char *hostname = NULL;
1009 char *plugin = NULL;
1010 char *plugin_instance = NULL;
1011 char *type = NULL;
1012 char *type_instance = NULL;
1014 hostname = str;
1015 if (hostname == NULL)
1016 return (-1);
1018 plugin = strchr (hostname, '/');
1019 if (plugin == NULL)
1020 return (-1);
1021 *plugin = '\0'; plugin++;
1023 type = strchr (plugin, '/');
1024 if (type == NULL)
1025 return (-1);
1026 *type = '\0'; type++;
1028 plugin_instance = strchr (plugin, '-');
1029 if (plugin_instance != NULL)
1030 {
1031 *plugin_instance = '\0';
1032 plugin_instance++;
1033 }
1035 type_instance = strchr (type, '-');
1036 if (type_instance != NULL)
1037 {
1038 *type_instance = '\0';
1039 type_instance++;
1040 }
1042 *ret_host = hostname;
1043 *ret_plugin = plugin;
1044 *ret_plugin_instance = plugin_instance;
1045 *ret_type = type;
1046 *ret_type_instance = type_instance;
1047 return (0);
1048 } /* int parse_identifier */
1050 int parse_identifier_vl (const char *str, value_list_t *vl) /* {{{ */
1051 {
1052 char str_copy[6 * DATA_MAX_NAME_LEN];
1053 char *host = NULL;
1054 char *plugin = NULL;
1055 char *plugin_instance = NULL;
1056 char *type = NULL;
1057 char *type_instance = NULL;
1058 int status;
1060 if ((str == NULL) || (vl == NULL))
1061 return (EINVAL);
1063 sstrncpy (str_copy, str, sizeof (str_copy));
1065 status = parse_identifier (str_copy, &host,
1066 &plugin, &plugin_instance,
1067 &type, &type_instance);
1068 if (status != 0)
1069 return (status);
1071 sstrncpy (vl->host, host, sizeof (vl->host));
1072 sstrncpy (vl->plugin, plugin, sizeof (vl->plugin));
1073 sstrncpy (vl->plugin_instance,
1074 (plugin_instance != NULL) ? plugin_instance : "",
1075 sizeof (vl->plugin_instance));
1076 sstrncpy (vl->type, type, sizeof (vl->type));
1077 sstrncpy (vl->type_instance,
1078 (type_instance != NULL) ? type_instance : "",
1079 sizeof (vl->type_instance));
1081 return (0);
1082 } /* }}} int parse_identifier_vl */
1084 int parse_value (const char *value_orig, value_t *ret_value, int ds_type)
1085 {
1086 char *value;
1087 char *endptr = NULL;
1088 size_t value_len;
1090 if (value_orig == NULL)
1091 return (EINVAL);
1093 value = strdup (value_orig);
1094 if (value == NULL)
1095 return (ENOMEM);
1096 value_len = strlen (value);
1098 while ((value_len > 0) && isspace ((int) value[value_len - 1]))
1099 {
1100 value[value_len - 1] = 0;
1101 value_len--;
1102 }
1104 switch (ds_type)
1105 {
1106 case DS_TYPE_COUNTER:
1107 ret_value->counter = (counter_t) strtoull (value, &endptr, 0);
1108 break;
1110 case DS_TYPE_GAUGE:
1111 ret_value->gauge = (gauge_t) strtod (value, &endptr);
1112 break;
1114 case DS_TYPE_DERIVE:
1115 ret_value->derive = (derive_t) strtoll (value, &endptr, 0);
1116 break;
1118 case DS_TYPE_ABSOLUTE:
1119 ret_value->absolute = (absolute_t) strtoull (value, &endptr, 0);
1120 break;
1122 default:
1123 sfree (value);
1124 ERROR ("parse_value: Invalid data source type: %i.", ds_type);
1125 return -1;
1126 }
1128 if (value == endptr) {
1129 ERROR ("parse_value: Failed to parse string as %s: %s.",
1130 DS_TYPE_TO_STRING (ds_type), value);
1131 sfree (value);
1132 return -1;
1133 }
1134 else if ((NULL != endptr) && ('\0' != *endptr))
1135 INFO ("parse_value: Ignoring trailing garbage \"%s\" after %s value. "
1136 "Input string was \"%s\".",
1137 endptr, DS_TYPE_TO_STRING (ds_type), value_orig);
1139 sfree (value);
1140 return 0;
1141 } /* int parse_value */
1143 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
1144 {
1145 size_t i;
1146 char *dummy;
1147 char *ptr;
1148 char *saveptr;
1150 if ((buffer == NULL) || (vl == NULL) || (ds == NULL))
1151 return EINVAL;
1153 i = 0;
1154 dummy = buffer;
1155 saveptr = NULL;
1156 vl->time = 0;
1157 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
1158 {
1159 dummy = NULL;
1161 if (i >= vl->values_len)
1162 {
1163 /* Make sure i is invalid. */
1164 i = 0;
1165 break;
1166 }
1168 if (vl->time == 0)
1169 {
1170 if (strcmp ("N", ptr) == 0)
1171 vl->time = cdtime ();
1172 else
1173 {
1174 char *endptr = NULL;
1175 double tmp;
1177 errno = 0;
1178 tmp = strtod (ptr, &endptr);
1179 if ((errno != 0) /* Overflow */
1180 || (endptr == ptr) /* Invalid string */
1181 || (endptr == NULL) /* This should not happen */
1182 || (*endptr != 0)) /* Trailing chars */
1183 return (-1);
1185 vl->time = DOUBLE_TO_CDTIME_T (tmp);
1186 }
1188 continue;
1189 }
1191 if ((strcmp ("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
1192 vl->values[i].gauge = NAN;
1193 else if (0 != parse_value (ptr, &vl->values[i], ds->ds[i].type))
1194 return -1;
1196 i++;
1197 } /* while (strtok_r) */
1199 if ((ptr != NULL) || (i == 0))
1200 return (-1);
1201 return (0);
1202 } /* int parse_values */
1204 #if !HAVE_GETPWNAM_R
1205 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
1206 size_t buflen, struct passwd **pwbufp)
1207 {
1208 int status = 0;
1209 struct passwd *pw;
1211 memset (pwbuf, '\0', sizeof (struct passwd));
1213 pthread_mutex_lock (&getpwnam_r_lock);
1215 do
1216 {
1217 pw = getpwnam (name);
1218 if (pw == NULL)
1219 {
1220 status = (errno != 0) ? errno : ENOENT;
1221 break;
1222 }
1224 #define GETPWNAM_COPY_MEMBER(member) \
1225 if (pw->member != NULL) \
1226 { \
1227 int len = strlen (pw->member); \
1228 if (len >= buflen) \
1229 { \
1230 status = ENOMEM; \
1231 break; \
1232 } \
1233 sstrncpy (buf, pw->member, buflen); \
1234 pwbuf->member = buf; \
1235 buf += (len + 1); \
1236 buflen -= (len + 1); \
1237 }
1238 GETPWNAM_COPY_MEMBER(pw_name);
1239 GETPWNAM_COPY_MEMBER(pw_passwd);
1240 GETPWNAM_COPY_MEMBER(pw_gecos);
1241 GETPWNAM_COPY_MEMBER(pw_dir);
1242 GETPWNAM_COPY_MEMBER(pw_shell);
1244 pwbuf->pw_uid = pw->pw_uid;
1245 pwbuf->pw_gid = pw->pw_gid;
1247 if (pwbufp != NULL)
1248 *pwbufp = pwbuf;
1249 } while (0);
1251 pthread_mutex_unlock (&getpwnam_r_lock);
1253 return (status);
1254 } /* int getpwnam_r */
1255 #endif /* !HAVE_GETPWNAM_R */
1257 int notification_init (notification_t *n, int severity, const char *message,
1258 const char *host,
1259 const char *plugin, const char *plugin_instance,
1260 const char *type, const char *type_instance)
1261 {
1262 memset (n, '\0', sizeof (notification_t));
1264 n->severity = severity;
1266 if (message != NULL)
1267 sstrncpy (n->message, message, sizeof (n->message));
1268 if (host != NULL)
1269 sstrncpy (n->host, host, sizeof (n->host));
1270 if (plugin != NULL)
1271 sstrncpy (n->plugin, plugin, sizeof (n->plugin));
1272 if (plugin_instance != NULL)
1273 sstrncpy (n->plugin_instance, plugin_instance,
1274 sizeof (n->plugin_instance));
1275 if (type != NULL)
1276 sstrncpy (n->type, type, sizeof (n->type));
1277 if (type_instance != NULL)
1278 sstrncpy (n->type_instance, type_instance,
1279 sizeof (n->type_instance));
1281 return (0);
1282 } /* int notification_init */
1284 int walk_directory (const char *dir, dirwalk_callback_f callback,
1285 void *user_data, int include_hidden)
1286 {
1287 struct dirent *ent;
1288 DIR *dh;
1289 int success;
1290 int failure;
1292 success = 0;
1293 failure = 0;
1295 if ((dh = opendir (dir)) == NULL)
1296 {
1297 char errbuf[1024];
1298 ERROR ("walk_directory: Cannot open '%s': %s", dir,
1299 sstrerror (errno, errbuf, sizeof (errbuf)));
1300 return -1;
1301 }
1303 while ((ent = readdir (dh)) != NULL)
1304 {
1305 int status;
1307 if (include_hidden)
1308 {
1309 if ((strcmp (".", ent->d_name) == 0)
1310 || (strcmp ("..", ent->d_name) == 0))
1311 continue;
1312 }
1313 else /* if (!include_hidden) */
1314 {
1315 if (ent->d_name[0]=='.')
1316 continue;
1317 }
1319 status = (*callback) (dir, ent->d_name, user_data);
1320 if (status != 0)
1321 failure++;
1322 else
1323 success++;
1324 }
1326 closedir (dh);
1328 if ((success == 0) && (failure > 0))
1329 return (-1);
1330 return (0);
1331 }
1333 ssize_t read_file_contents (const char *filename, char *buf, size_t bufsize)
1334 {
1335 FILE *fh;
1336 ssize_t ret;
1338 fh = fopen (filename, "r");
1339 if (fh == NULL)
1340 return (-1);
1342 ret = (ssize_t) fread (buf, 1, bufsize, fh);
1343 if ((ret == 0) && (ferror (fh) != 0))
1344 {
1345 ERROR ("read_file_contents: Reading file \"%s\" failed.",
1346 filename);
1347 ret = -1;
1348 }
1350 fclose(fh);
1351 return (ret);
1352 }
1354 counter_t counter_diff (counter_t old_value, counter_t new_value)
1355 {
1356 counter_t diff;
1358 if (old_value > new_value)
1359 {
1360 if (old_value <= 4294967295U)
1361 diff = (4294967295U - old_value) + new_value + 1;
1362 else
1363 diff = (18446744073709551615ULL - old_value) + new_value + 1;
1364 }
1365 else
1366 {
1367 diff = new_value - old_value;
1368 }
1370 return (diff);
1371 } /* counter_t counter_diff */
1373 int rate_to_value (value_t *ret_value, gauge_t rate, /* {{{ */
1374 rate_to_value_state_t *state,
1375 int ds_type, cdtime_t t)
1376 {
1377 gauge_t delta_gauge;
1378 cdtime_t delta_t;
1380 if (ds_type == DS_TYPE_GAUGE)
1381 {
1382 state->last_value.gauge = rate;
1383 state->last_time = t;
1385 *ret_value = state->last_value;
1386 return (0);
1387 }
1389 /* Counter and absolute can't handle negative rates. Reset "last time"
1390 * to zero, so that the next valid rate will re-initialize the
1391 * structure. */
1392 if ((rate < 0.0)
1393 && ((ds_type == DS_TYPE_COUNTER)
1394 || (ds_type == DS_TYPE_ABSOLUTE)))
1395 {
1396 memset (state, 0, sizeof (*state));
1397 return (EINVAL);
1398 }
1400 /* Another invalid state: The time is not increasing. */
1401 if (t <= state->last_time)
1402 {
1403 memset (state, 0, sizeof (*state));
1404 return (EINVAL);
1405 }
1407 delta_t = t - state->last_time;
1408 delta_gauge = (rate * CDTIME_T_TO_DOUBLE (delta_t)) + state->residual;
1410 /* Previous value is invalid. */
1411 if (state->last_time == 0) /* {{{ */
1412 {
1413 if (ds_type == DS_TYPE_DERIVE)
1414 {
1415 state->last_value.derive = (derive_t) rate;
1416 state->residual = rate - ((gauge_t) state->last_value.derive);
1417 }
1418 else if (ds_type == DS_TYPE_COUNTER)
1419 {
1420 state->last_value.counter = (counter_t) rate;
1421 state->residual = rate - ((gauge_t) state->last_value.counter);
1422 }
1423 else if (ds_type == DS_TYPE_ABSOLUTE)
1424 {
1425 state->last_value.absolute = (absolute_t) rate;
1426 state->residual = rate - ((gauge_t) state->last_value.absolute);
1427 }
1428 else
1429 {
1430 assert (23 == 42);
1431 }
1433 state->last_time = t;
1434 return (EAGAIN);
1435 } /* }}} */
1437 if (ds_type == DS_TYPE_DERIVE)
1438 {
1439 derive_t delta_derive = (derive_t) delta_gauge;
1441 state->last_value.derive += delta_derive;
1442 state->residual = delta_gauge - ((gauge_t) delta_derive);
1443 }
1444 else if (ds_type == DS_TYPE_COUNTER)
1445 {
1446 counter_t delta_counter = (counter_t) delta_gauge;
1448 state->last_value.counter += delta_counter;
1449 state->residual = delta_gauge - ((gauge_t) delta_counter);
1450 }
1451 else if (ds_type == DS_TYPE_ABSOLUTE)
1452 {
1453 absolute_t delta_absolute = (absolute_t) delta_gauge;
1455 state->last_value.absolute = delta_absolute;
1456 state->residual = delta_gauge - ((gauge_t) delta_absolute);
1457 }
1458 else
1459 {
1460 assert (23 == 42);
1461 }
1463 state->last_time = t;
1464 *ret_value = state->last_value;
1465 return (0);
1466 } /* }}} value_t rate_to_value */
1468 int value_to_rate (gauge_t *ret_rate, /* {{{ */
1469 value_t value, int ds_type, cdtime_t t, value_to_rate_state_t *state)
1470 {
1471 gauge_t interval;
1473 /* Another invalid state: The time is not increasing. */
1474 if (t <= state->last_time)
1475 {
1476 memset (state, 0, sizeof (*state));
1477 return (EINVAL);
1478 }
1480 interval = CDTIME_T_TO_DOUBLE(t - state->last_time);
1482 /* Previous value is invalid. */
1483 if (state->last_time == 0)
1484 {
1485 state->last_value = value;
1486 state->last_time = t;
1487 return (EAGAIN);
1488 }
1490 switch (ds_type) {
1491 case DS_TYPE_DERIVE: {
1492 derive_t diff = value.derive - state->last_value.derive;
1493 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1494 break;
1495 }
1496 case DS_TYPE_GAUGE: {
1497 *ret_rate = value.gauge;
1498 break;
1499 }
1500 case DS_TYPE_COUNTER: {
1501 counter_t diff = counter_diff (state->last_value.counter, value.counter);
1502 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1503 break;
1504 }
1505 case DS_TYPE_ABSOLUTE: {
1506 absolute_t diff = value.absolute;
1507 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1508 break;
1509 }
1510 default:
1511 return EINVAL;
1512 }
1514 state->last_value = value;
1515 state->last_time = t;
1516 return (0);
1517 } /* }}} value_t rate_to_value */
1519 int service_name_to_port_number (const char *service_name)
1520 {
1521 struct addrinfo *ai_list;
1522 int status;
1523 int service_number;
1525 if (service_name == NULL)
1526 return (-1);
1528 struct addrinfo ai_hints = {
1529 .ai_family = AF_UNSPEC
1530 };
1532 status = getaddrinfo (/* node = */ NULL, service_name,
1533 &ai_hints, &ai_list);
1534 if (status != 0)
1535 {
1536 ERROR ("service_name_to_port_number: getaddrinfo failed: %s",
1537 gai_strerror (status));
1538 return (-1);
1539 }
1541 service_number = -1;
1542 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1543 {
1544 if (ai_ptr->ai_family == AF_INET)
1545 {
1546 struct sockaddr_in *sa;
1548 sa = (void *) ai_ptr->ai_addr;
1549 service_number = (int) ntohs (sa->sin_port);
1550 }
1551 else if (ai_ptr->ai_family == AF_INET6)
1552 {
1553 struct sockaddr_in6 *sa;
1555 sa = (void *) ai_ptr->ai_addr;
1556 service_number = (int) ntohs (sa->sin6_port);
1557 }
1559 if ((service_number > 0) && (service_number <= 65535))
1560 break;
1561 }
1563 freeaddrinfo (ai_list);
1565 if ((service_number > 0) && (service_number <= 65535))
1566 return (service_number);
1567 return (-1);
1568 } /* int service_name_to_port_number */
1570 void set_sock_opts (int sockfd) /* {{{ */
1571 {
1572 int status;
1573 int socktype;
1575 socklen_t socklen = sizeof (socklen_t);
1576 int so_keepalive = 1;
1578 status = getsockopt (sockfd, SOL_SOCKET, SO_TYPE, &socktype, &socklen);
1579 if (status != 0)
1580 {
1581 WARNING ("set_sock_opts: failed to determine socket type");
1582 return;
1583 }
1585 if (socktype == SOCK_STREAM)
1586 {
1587 status = setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE,
1588 &so_keepalive, sizeof (so_keepalive));
1589 if (status != 0)
1590 WARNING ("set_sock_opts: failed to set socket keepalive flag");
1592 #ifdef TCP_KEEPIDLE
1593 int tcp_keepidle = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 100 + 1);
1594 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE,
1595 &tcp_keepidle, sizeof (tcp_keepidle));
1596 if (status != 0)
1597 WARNING ("set_sock_opts: failed to set socket tcp keepalive time");
1598 #endif
1600 #ifdef TCP_KEEPINTVL
1601 int tcp_keepintvl = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 1000 + 1);
1602 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL,
1603 &tcp_keepintvl, sizeof (tcp_keepintvl));
1604 if (status != 0)
1605 WARNING ("set_sock_opts: failed to set socket tcp keepalive interval");
1606 #endif
1607 }
1608 } /* }}} void set_sock_opts */
1610 int strtoderive (const char *string, derive_t *ret_value) /* {{{ */
1611 {
1612 derive_t tmp;
1613 char *endptr;
1615 if ((string == NULL) || (ret_value == NULL))
1616 return (EINVAL);
1618 errno = 0;
1619 endptr = NULL;
1620 tmp = (derive_t) strtoll (string, &endptr, /* base = */ 0);
1621 if ((endptr == string) || (errno != 0))
1622 return (-1);
1624 *ret_value = tmp;
1625 return (0);
1626 } /* }}} int strtoderive */
1628 int strtogauge (const char *string, gauge_t *ret_value) /* {{{ */
1629 {
1630 gauge_t tmp;
1631 char *endptr = NULL;
1633 if ((string == NULL) || (ret_value == NULL))
1634 return (EINVAL);
1636 errno = 0;
1637 endptr = NULL;
1638 tmp = (gauge_t) strtod (string, &endptr);
1639 if (errno != 0)
1640 return (errno);
1641 else if ((endptr == NULL) || (*endptr != 0))
1642 return (EINVAL);
1644 *ret_value = tmp;
1645 return (0);
1646 } /* }}} int strtogauge */
1648 int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str) /* {{{ */
1649 {
1650 char **array;
1651 size_t array_len = *ret_array_len;
1653 if (str == NULL)
1654 return (EINVAL);
1656 array = realloc (*ret_array,
1657 (array_len + 1) * sizeof (*array));
1658 if (array == NULL)
1659 return (ENOMEM);
1660 *ret_array = array;
1662 array[array_len] = strdup (str);
1663 if (array[array_len] == NULL)
1664 return (ENOMEM);
1666 array_len++;
1667 *ret_array_len = array_len;
1668 return (0);
1669 } /* }}} int strarray_add */
1671 void strarray_free (char **array, size_t array_len) /* {{{ */
1672 {
1673 for (size_t i = 0; i < array_len; i++)
1674 sfree (array[i]);
1675 sfree (array);
1676 } /* }}} void strarray_free */
1678 #ifdef HAVE_SYS_CAPABILITY_H
1679 int check_capability (int capability) /* {{{ */
1680 {
1681 #ifdef _LINUX_CAPABILITY_VERSION_3
1682 cap_user_header_t cap_header = calloc(1, sizeof (*cap_header));
1683 if (cap_header == NULL)
1684 {
1685 ERROR("check_capability: calloc failed");
1686 return (-1);
1687 }
1689 cap_user_data_t cap_data = calloc(1, sizeof (*cap_data));
1690 if (cap_data == NULL)
1691 {
1692 ERROR("check_capability: calloc failed");
1693 sfree(cap_header);
1694 return (-1);
1695 }
1697 cap_header->pid = getpid();
1698 cap_header->version = _LINUX_CAPABILITY_VERSION;
1699 if (capget(cap_header, cap_data) < 0)
1700 {
1701 ERROR("check_capability: capget failed");
1702 sfree(cap_header);
1703 sfree(cap_data);
1704 return (-1);
1705 }
1707 if ((cap_data->effective & (1 << capability)) == 0)
1708 {
1709 sfree(cap_header);
1710 sfree(cap_data);
1711 return (-1);
1712 }
1713 else
1714 {
1715 sfree(cap_header);
1716 sfree(cap_data);
1717 return (0);
1718 }
1719 #else
1720 WARNING ("check_capability: unsupported capability implementation. "
1721 "Some plugin(s) may require elevated privileges to work properly.");
1722 return (0);
1723 #endif /* _LINUX_CAPABILITY_VERSION_3 */
1724 } /* }}} int check_capability */
1725 #endif /* HAVE_SYS_CAPABILITY_H */