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, char **fields, size_t fields_num,
338 const char *sep) {
339 size_t avail = 0;
340 char *ptr = buffer;
341 size_t sep_len = 0;
343 size_t buffer_req = 0;
345 if (((fields_num != 0) && (fields == NULL)) ||
346 ((buffer_size != 0) && (buffer == NULL)))
347 return (-EINVAL);
349 if (buffer != NULL)
350 buffer[0] = 0;
352 if (buffer_size != 0)
353 avail = buffer_size - 1;
355 if (sep != NULL)
356 sep_len = strlen(sep);
358 for (size_t i = 0; i < fields_num; i++) {
359 size_t field_len = strlen(fields[i]);
361 if (i != 0)
362 buffer_req += sep_len;
363 buffer_req += field_len;
365 if ((i != 0) && (sep_len > 0)) {
366 if (sep_len >= avail) {
367 /* prevent subsequent iterations from writing to the
368 * buffer. */
369 avail = 0;
370 continue;
371 }
373 memcpy(ptr, sep, sep_len);
375 ptr += sep_len;
376 avail -= sep_len;
377 }
379 if (field_len > avail)
380 field_len = avail;
382 memcpy(ptr, fields[i], field_len);
383 ptr += field_len;
385 avail -= field_len;
386 if (ptr != NULL)
387 *ptr = 0;
388 }
390 return (int)buffer_req;
391 }
393 int escape_string (char *buffer, size_t buffer_size)
394 {
395 char *temp;
396 size_t j;
398 /* Check if we need to escape at all first */
399 temp = strpbrk (buffer, " \t\"\\");
400 if (temp == NULL)
401 return (0);
403 if (buffer_size < 3)
404 return (EINVAL);
406 temp = calloc (1, buffer_size);
407 if (temp == NULL)
408 return (ENOMEM);
410 temp[0] = '"';
411 j = 1;
413 for (size_t i = 0; i < buffer_size; i++)
414 {
415 if (buffer[i] == 0)
416 {
417 break;
418 }
419 else if ((buffer[i] == '"') || (buffer[i] == '\\'))
420 {
421 if (j > (buffer_size - 4))
422 break;
423 temp[j] = '\\';
424 temp[j + 1] = buffer[i];
425 j += 2;
426 }
427 else
428 {
429 if (j > (buffer_size - 3))
430 break;
431 temp[j] = buffer[i];
432 j++;
433 }
434 }
436 assert ((j + 1) < buffer_size);
437 temp[j] = '"';
438 temp[j + 1] = 0;
440 sstrncpy (buffer, temp, buffer_size);
441 sfree (temp);
442 return (0);
443 } /* int escape_string */
445 int strunescape (char *buf, size_t buf_len)
446 {
447 for (size_t i = 0; (i < buf_len) && (buf[i] != '\0'); ++i)
448 {
449 if (buf[i] != '\\')
450 continue;
452 if (((i + 1) >= buf_len) || (buf[i + 1] == 0)) {
453 ERROR ("string unescape: backslash found at end of string.");
454 /* Ensure null-byte at the end of the buffer. */
455 buf[i] = 0;
456 return (-1);
457 }
459 switch (buf[i + 1]) {
460 case 't':
461 buf[i] = '\t';
462 break;
463 case 'n':
464 buf[i] = '\n';
465 break;
466 case 'r':
467 buf[i] = '\r';
468 break;
469 default:
470 buf[i] = buf[i + 1];
471 break;
472 }
474 /* Move everything after the position one position to the left.
475 * Add a null-byte as last character in the buffer. */
476 memmove (buf + i + 1, buf + i + 2, buf_len - i - 2);
477 buf[buf_len - 1] = 0;
478 }
479 return (0);
480 } /* int strunescape */
482 size_t strstripnewline (char *buffer)
483 {
484 size_t buffer_len = strlen (buffer);
486 while (buffer_len > 0)
487 {
488 if ((buffer[buffer_len - 1] != '\n')
489 && (buffer[buffer_len - 1] != '\r'))
490 break;
491 buffer_len--;
492 buffer[buffer_len] = 0;
493 }
495 return (buffer_len);
496 } /* size_t strstripnewline */
498 int escape_slashes (char *buffer, size_t buffer_size)
499 {
500 size_t buffer_len;
502 buffer_len = strlen (buffer);
504 if (buffer_len <= 1)
505 {
506 if (strcmp ("/", buffer) == 0)
507 {
508 if (buffer_size < 5)
509 return (-1);
510 sstrncpy (buffer, "root", buffer_size);
511 }
512 return (0);
513 }
515 /* Move one to the left */
516 if (buffer[0] == '/')
517 {
518 memmove (buffer, buffer + 1, buffer_len);
519 buffer_len--;
520 }
522 for (size_t i = 0; i < buffer_len; i++)
523 {
524 if (buffer[i] == '/')
525 buffer[i] = '_';
526 }
528 return (0);
529 } /* int escape_slashes */
531 void replace_special (char *buffer, size_t buffer_size)
532 {
533 for (size_t i = 0; i < buffer_size; i++)
534 {
535 if (buffer[i] == 0)
536 return;
537 if ((!isalnum ((int) buffer[i])) && (buffer[i] != '-'))
538 buffer[i] = '_';
539 }
540 } /* void replace_special */
542 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
543 {
544 struct timeval *larger;
545 struct timeval *smaller;
547 int status;
549 NORMALIZE_TIMEVAL (tv0);
550 NORMALIZE_TIMEVAL (tv1);
552 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
553 {
554 if (delta != NULL) {
555 delta->tv_sec = 0;
556 delta->tv_usec = 0;
557 }
558 return (0);
559 }
561 if ((tv0.tv_sec < tv1.tv_sec)
562 || ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
563 {
564 larger = &tv1;
565 smaller = &tv0;
566 status = -1;
567 }
568 else
569 {
570 larger = &tv0;
571 smaller = &tv1;
572 status = 1;
573 }
575 if (delta != NULL) {
576 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
578 if (smaller->tv_usec <= larger->tv_usec)
579 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
580 else
581 {
582 --delta->tv_sec;
583 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
584 }
585 }
587 assert ((delta == NULL)
588 || ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
590 return (status);
591 } /* int timeval_cmp */
593 int check_create_dir (const char *file_orig)
594 {
595 struct stat statbuf;
597 char file_copy[512];
598 char dir[512];
599 int dir_len = 512;
600 char *fields[16];
601 int fields_num;
602 char *ptr;
603 char *saveptr;
604 int last_is_file = 1;
605 int path_is_absolute = 0;
606 size_t len;
608 /*
609 * Sanity checks first
610 */
611 if (file_orig == NULL)
612 return (-1);
614 if ((len = strlen (file_orig)) < 1)
615 return (-1);
616 else if (len >= sizeof (file_copy))
617 return (-1);
619 /*
620 * If `file_orig' ends in a slash the last component is a directory,
621 * otherwise it's a file. Act accordingly..
622 */
623 if (file_orig[len - 1] == '/')
624 last_is_file = 0;
625 if (file_orig[0] == '/')
626 path_is_absolute = 1;
628 /*
629 * Create a copy for `strtok_r' to destroy
630 */
631 sstrncpy (file_copy, file_orig, sizeof (file_copy));
633 /*
634 * Break into components. This will eat up several slashes in a row and
635 * remove leading and trailing slashes..
636 */
637 ptr = file_copy;
638 saveptr = NULL;
639 fields_num = 0;
640 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
641 {
642 ptr = NULL;
643 fields_num++;
645 if (fields_num >= 16)
646 break;
647 }
649 /*
650 * For each component, do..
651 */
652 for (int i = 0; i < (fields_num - last_is_file); i++)
653 {
654 /*
655 * Do not create directories that start with a dot. This
656 * prevents `../../' attacks and other likely malicious
657 * behavior.
658 */
659 if (fields[i][0] == '.')
660 {
661 ERROR ("Cowardly refusing to create a directory that "
662 "begins with a `.' (dot): `%s'", file_orig);
663 return (-2);
664 }
666 /*
667 * Join the components together again
668 */
669 dir[0] = '/';
670 if (strjoin (dir + path_is_absolute, (size_t) (dir_len - path_is_absolute),
671 fields, (size_t) (i + 1), "/") < 0)
672 {
673 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
674 return (-1);
675 }
677 while (42) {
678 if ((stat (dir, &statbuf) == -1)
679 && (lstat (dir, &statbuf) == -1))
680 {
681 if (errno == ENOENT)
682 {
683 if (mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0)
684 break;
686 /* this might happen, if a different thread created
687 * the directory in the meantime
688 * => call stat() again to check for S_ISDIR() */
689 if (EEXIST == errno)
690 continue;
692 char errbuf[1024];
693 ERROR ("check_create_dir: mkdir (%s): %s", dir,
694 sstrerror (errno,
695 errbuf, sizeof (errbuf)));
696 return (-1);
697 }
698 else
699 {
700 char errbuf[1024];
701 ERROR ("check_create_dir: stat (%s): %s", dir,
702 sstrerror (errno, errbuf,
703 sizeof (errbuf)));
704 return (-1);
705 }
706 }
707 else if (!S_ISDIR (statbuf.st_mode))
708 {
709 ERROR ("check_create_dir: `%s' exists but is not "
710 "a directory!", dir);
711 return (-1);
712 }
713 break;
714 }
715 }
717 return (0);
718 } /* check_create_dir */
720 #ifdef HAVE_LIBKSTAT
721 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
722 {
723 char ident[128];
725 *ksp_ptr = NULL;
727 if (kc == NULL)
728 return (-1);
730 ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
732 *ksp_ptr = kstat_lookup (kc, module, instance, name);
733 if (*ksp_ptr == NULL)
734 {
735 ERROR ("get_kstat: Cound not find kstat %s", ident);
736 return (-1);
737 }
739 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
740 {
741 ERROR ("get_kstat: kstat %s has wrong type", ident);
742 *ksp_ptr = NULL;
743 return (-1);
744 }
746 #ifdef assert
747 assert (*ksp_ptr != NULL);
748 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
749 #endif
751 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
752 {
753 ERROR ("get_kstat: kstat %s could not be read", ident);
754 return (-1);
755 }
757 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
758 {
759 ERROR ("get_kstat: kstat %s has wrong type", ident);
760 return (-1);
761 }
763 return (0);
764 }
766 long long get_kstat_value (kstat_t *ksp, char *name)
767 {
768 kstat_named_t *kn;
769 long long retval = -1LL;
771 if (ksp == NULL)
772 {
773 ERROR ("get_kstat_value (\"%s\"): ksp is NULL.", name);
774 return (-1LL);
775 }
776 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
777 {
778 ERROR ("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
779 "is not KSTAT_TYPE_NAMED (%#x).",
780 name,
781 (unsigned int) ksp->ks_type,
782 (unsigned int) KSTAT_TYPE_NAMED);
783 return (-1LL);
784 }
786 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
787 return (-1LL);
789 if (kn->data_type == KSTAT_DATA_INT32)
790 retval = (long long) kn->value.i32;
791 else if (kn->data_type == KSTAT_DATA_UINT32)
792 retval = (long long) kn->value.ui32;
793 else if (kn->data_type == KSTAT_DATA_INT64)
794 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
795 else if (kn->data_type == KSTAT_DATA_UINT64)
796 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
797 else
798 WARNING ("get_kstat_value: Not a numeric value: %s", name);
800 return (retval);
801 }
802 #endif /* HAVE_LIBKSTAT */
804 #ifndef HAVE_HTONLL
805 unsigned long long ntohll (unsigned long long n)
806 {
807 #if BYTE_ORDER == BIG_ENDIAN
808 return (n);
809 #else
810 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
811 #endif
812 } /* unsigned long long ntohll */
814 unsigned long long htonll (unsigned long long n)
815 {
816 #if BYTE_ORDER == BIG_ENDIAN
817 return (n);
818 #else
819 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
820 #endif
821 } /* unsigned long long htonll */
822 #endif /* HAVE_HTONLL */
824 #if FP_LAYOUT_NEED_NOTHING
825 /* Well, we need nothing.. */
826 /* #endif FP_LAYOUT_NEED_NOTHING */
828 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
829 # if FP_LAYOUT_NEED_ENDIANFLIP
830 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
831 (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
832 (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
833 (((uint64_t)(A) & 0x000000ff00000000LL) >> 8) | \
834 (((uint64_t)(A) & 0x00000000ff000000LL) << 8) | \
835 (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
836 (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
837 (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
838 # else
839 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
840 (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
841 # endif
843 double ntohd (double d)
844 {
845 union
846 {
847 uint8_t byte[8];
848 uint64_t integer;
849 double floating;
850 } ret;
852 ret.floating = d;
854 /* NAN in x86 byte order */
855 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
856 && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
857 && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
858 && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
859 {
860 return (NAN);
861 }
862 else
863 {
864 uint64_t tmp;
866 tmp = ret.integer;
867 ret.integer = FP_CONVERT (tmp);
868 return (ret.floating);
869 }
870 } /* double ntohd */
872 double htond (double d)
873 {
874 union
875 {
876 uint8_t byte[8];
877 uint64_t integer;
878 double floating;
879 } ret;
881 if (isnan (d))
882 {
883 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
884 ret.byte[4] = ret.byte[5] = 0x00;
885 ret.byte[6] = 0xf8;
886 ret.byte[7] = 0x7f;
887 return (ret.floating);
888 }
889 else
890 {
891 uint64_t tmp;
893 ret.floating = d;
894 tmp = FP_CONVERT (ret.integer);
895 ret.integer = tmp;
896 return (ret.floating);
897 }
898 } /* double htond */
899 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
901 int format_name (char *ret, int ret_len,
902 const char *hostname,
903 const char *plugin, const char *plugin_instance,
904 const char *type, const char *type_instance)
905 {
906 char *buffer;
907 size_t buffer_size;
909 buffer = ret;
910 buffer_size = (size_t) ret_len;
912 #define APPEND(str) do { \
913 size_t l = strlen (str); \
914 if (l >= buffer_size) \
915 return (ENOBUFS); \
916 memcpy (buffer, (str), l); \
917 buffer += l; buffer_size -= l; \
918 } while (0)
920 assert (plugin != NULL);
921 assert (type != NULL);
923 APPEND (hostname);
924 APPEND ("/");
925 APPEND (plugin);
926 if ((plugin_instance != NULL) && (plugin_instance[0] != 0))
927 {
928 APPEND ("-");
929 APPEND (plugin_instance);
930 }
931 APPEND ("/");
932 APPEND (type);
933 if ((type_instance != NULL) && (type_instance[0] != 0))
934 {
935 APPEND ("-");
936 APPEND (type_instance);
937 }
938 assert (buffer_size > 0);
939 buffer[0] = 0;
941 #undef APPEND
942 return (0);
943 } /* int format_name */
945 int format_values (char *ret, size_t ret_len, /* {{{ */
946 const data_set_t *ds, const value_list_t *vl,
947 _Bool store_rates)
948 {
949 size_t offset = 0;
950 int status;
951 gauge_t *rates = NULL;
953 assert (0 == strcmp (ds->type, vl->type));
955 memset (ret, 0, ret_len);
957 #define BUFFER_ADD(...) do { \
958 status = ssnprintf (ret + offset, ret_len - offset, \
959 __VA_ARGS__); \
960 if (status < 1) \
961 { \
962 sfree (rates); \
963 return (-1); \
964 } \
965 else if (((size_t) status) >= (ret_len - offset)) \
966 { \
967 sfree (rates); \
968 return (-1); \
969 } \
970 else \
971 offset += ((size_t) status); \
972 } while (0)
974 BUFFER_ADD ("%.3f", CDTIME_T_TO_DOUBLE (vl->time));
976 for (size_t i = 0; i < ds->ds_num; i++)
977 {
978 if (ds->ds[i].type == DS_TYPE_GAUGE)
979 BUFFER_ADD (":"GAUGE_FORMAT, vl->values[i].gauge);
980 else if (store_rates)
981 {
982 if (rates == NULL)
983 rates = uc_get_rate (ds, vl);
984 if (rates == NULL)
985 {
986 WARNING ("format_values: uc_get_rate failed.");
987 return (-1);
988 }
989 BUFFER_ADD (":"GAUGE_FORMAT, rates[i]);
990 }
991 else if (ds->ds[i].type == DS_TYPE_COUNTER)
992 BUFFER_ADD (":%llu", vl->values[i].counter);
993 else if (ds->ds[i].type == DS_TYPE_DERIVE)
994 BUFFER_ADD (":%"PRIi64, vl->values[i].derive);
995 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
996 BUFFER_ADD (":%"PRIu64, vl->values[i].absolute);
997 else
998 {
999 ERROR ("format_values: Unknown data source type: %i",
1000 ds->ds[i].type);
1001 sfree (rates);
1002 return (-1);
1003 }
1004 } /* for ds->ds_num */
1006 #undef BUFFER_ADD
1008 sfree (rates);
1009 return (0);
1010 } /* }}} int format_values */
1012 int parse_identifier (char *str, char **ret_host,
1013 char **ret_plugin, char **ret_plugin_instance,
1014 char **ret_type, char **ret_type_instance)
1015 {
1016 char *hostname = NULL;
1017 char *plugin = NULL;
1018 char *plugin_instance = NULL;
1019 char *type = NULL;
1020 char *type_instance = NULL;
1022 hostname = str;
1023 if (hostname == NULL)
1024 return (-1);
1026 plugin = strchr (hostname, '/');
1027 if (plugin == NULL)
1028 return (-1);
1029 *plugin = '\0'; plugin++;
1031 type = strchr (plugin, '/');
1032 if (type == NULL)
1033 return (-1);
1034 *type = '\0'; type++;
1036 plugin_instance = strchr (plugin, '-');
1037 if (plugin_instance != NULL)
1038 {
1039 *plugin_instance = '\0';
1040 plugin_instance++;
1041 }
1043 type_instance = strchr (type, '-');
1044 if (type_instance != NULL)
1045 {
1046 *type_instance = '\0';
1047 type_instance++;
1048 }
1050 *ret_host = hostname;
1051 *ret_plugin = plugin;
1052 *ret_plugin_instance = plugin_instance;
1053 *ret_type = type;
1054 *ret_type_instance = type_instance;
1055 return (0);
1056 } /* int parse_identifier */
1058 int parse_identifier_vl (const char *str, value_list_t *vl) /* {{{ */
1059 {
1060 char str_copy[6 * DATA_MAX_NAME_LEN];
1061 char *host = NULL;
1062 char *plugin = NULL;
1063 char *plugin_instance = NULL;
1064 char *type = NULL;
1065 char *type_instance = NULL;
1066 int status;
1068 if ((str == NULL) || (vl == NULL))
1069 return (EINVAL);
1071 sstrncpy (str_copy, str, sizeof (str_copy));
1073 status = parse_identifier (str_copy, &host,
1074 &plugin, &plugin_instance,
1075 &type, &type_instance);
1076 if (status != 0)
1077 return (status);
1079 sstrncpy (vl->host, host, sizeof (vl->host));
1080 sstrncpy (vl->plugin, plugin, sizeof (vl->plugin));
1081 sstrncpy (vl->plugin_instance,
1082 (plugin_instance != NULL) ? plugin_instance : "",
1083 sizeof (vl->plugin_instance));
1084 sstrncpy (vl->type, type, sizeof (vl->type));
1085 sstrncpy (vl->type_instance,
1086 (type_instance != NULL) ? type_instance : "",
1087 sizeof (vl->type_instance));
1089 return (0);
1090 } /* }}} int parse_identifier_vl */
1092 int parse_value (const char *value_orig, value_t *ret_value, int ds_type)
1093 {
1094 char *value;
1095 char *endptr = NULL;
1096 size_t value_len;
1098 if (value_orig == NULL)
1099 return (EINVAL);
1101 value = strdup (value_orig);
1102 if (value == NULL)
1103 return (ENOMEM);
1104 value_len = strlen (value);
1106 while ((value_len > 0) && isspace ((int) value[value_len - 1]))
1107 {
1108 value[value_len - 1] = 0;
1109 value_len--;
1110 }
1112 switch (ds_type)
1113 {
1114 case DS_TYPE_COUNTER:
1115 ret_value->counter = (counter_t) strtoull (value, &endptr, 0);
1116 break;
1118 case DS_TYPE_GAUGE:
1119 ret_value->gauge = (gauge_t) strtod (value, &endptr);
1120 break;
1122 case DS_TYPE_DERIVE:
1123 ret_value->derive = (derive_t) strtoll (value, &endptr, 0);
1124 break;
1126 case DS_TYPE_ABSOLUTE:
1127 ret_value->absolute = (absolute_t) strtoull (value, &endptr, 0);
1128 break;
1130 default:
1131 sfree (value);
1132 ERROR ("parse_value: Invalid data source type: %i.", ds_type);
1133 return -1;
1134 }
1136 if (value == endptr) {
1137 ERROR ("parse_value: Failed to parse string as %s: %s.",
1138 DS_TYPE_TO_STRING (ds_type), value);
1139 sfree (value);
1140 return -1;
1141 }
1142 else if ((NULL != endptr) && ('\0' != *endptr))
1143 INFO ("parse_value: Ignoring trailing garbage \"%s\" after %s value. "
1144 "Input string was \"%s\".",
1145 endptr, DS_TYPE_TO_STRING (ds_type), value_orig);
1147 sfree (value);
1148 return 0;
1149 } /* int parse_value */
1151 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
1152 {
1153 size_t i;
1154 char *dummy;
1155 char *ptr;
1156 char *saveptr;
1158 if ((buffer == NULL) || (vl == NULL) || (ds == NULL))
1159 return EINVAL;
1161 i = 0;
1162 dummy = buffer;
1163 saveptr = NULL;
1164 vl->time = 0;
1165 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
1166 {
1167 dummy = NULL;
1169 if (i >= vl->values_len)
1170 {
1171 /* Make sure i is invalid. */
1172 i = 0;
1173 break;
1174 }
1176 if (vl->time == 0)
1177 {
1178 if (strcmp ("N", ptr) == 0)
1179 vl->time = cdtime ();
1180 else
1181 {
1182 char *endptr = NULL;
1183 double tmp;
1185 errno = 0;
1186 tmp = strtod (ptr, &endptr);
1187 if ((errno != 0) /* Overflow */
1188 || (endptr == ptr) /* Invalid string */
1189 || (endptr == NULL) /* This should not happen */
1190 || (*endptr != 0)) /* Trailing chars */
1191 return (-1);
1193 vl->time = DOUBLE_TO_CDTIME_T (tmp);
1194 }
1196 continue;
1197 }
1199 if ((strcmp ("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
1200 vl->values[i].gauge = NAN;
1201 else if (0 != parse_value (ptr, &vl->values[i], ds->ds[i].type))
1202 return -1;
1204 i++;
1205 } /* while (strtok_r) */
1207 if ((ptr != NULL) || (i == 0))
1208 return (-1);
1209 return (0);
1210 } /* int parse_values */
1212 #if !HAVE_GETPWNAM_R
1213 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
1214 size_t buflen, struct passwd **pwbufp)
1215 {
1216 int status = 0;
1217 struct passwd *pw;
1219 memset (pwbuf, '\0', sizeof (struct passwd));
1221 pthread_mutex_lock (&getpwnam_r_lock);
1223 do
1224 {
1225 pw = getpwnam (name);
1226 if (pw == NULL)
1227 {
1228 status = (errno != 0) ? errno : ENOENT;
1229 break;
1230 }
1232 #define GETPWNAM_COPY_MEMBER(member) \
1233 if (pw->member != NULL) \
1234 { \
1235 int len = strlen (pw->member); \
1236 if (len >= buflen) \
1237 { \
1238 status = ENOMEM; \
1239 break; \
1240 } \
1241 sstrncpy (buf, pw->member, buflen); \
1242 pwbuf->member = buf; \
1243 buf += (len + 1); \
1244 buflen -= (len + 1); \
1245 }
1246 GETPWNAM_COPY_MEMBER(pw_name);
1247 GETPWNAM_COPY_MEMBER(pw_passwd);
1248 GETPWNAM_COPY_MEMBER(pw_gecos);
1249 GETPWNAM_COPY_MEMBER(pw_dir);
1250 GETPWNAM_COPY_MEMBER(pw_shell);
1252 pwbuf->pw_uid = pw->pw_uid;
1253 pwbuf->pw_gid = pw->pw_gid;
1255 if (pwbufp != NULL)
1256 *pwbufp = pwbuf;
1257 } while (0);
1259 pthread_mutex_unlock (&getpwnam_r_lock);
1261 return (status);
1262 } /* int getpwnam_r */
1263 #endif /* !HAVE_GETPWNAM_R */
1265 int notification_init (notification_t *n, int severity, const char *message,
1266 const char *host,
1267 const char *plugin, const char *plugin_instance,
1268 const char *type, const char *type_instance)
1269 {
1270 memset (n, '\0', sizeof (notification_t));
1272 n->severity = severity;
1274 if (message != NULL)
1275 sstrncpy (n->message, message, sizeof (n->message));
1276 if (host != NULL)
1277 sstrncpy (n->host, host, sizeof (n->host));
1278 if (plugin != NULL)
1279 sstrncpy (n->plugin, plugin, sizeof (n->plugin));
1280 if (plugin_instance != NULL)
1281 sstrncpy (n->plugin_instance, plugin_instance,
1282 sizeof (n->plugin_instance));
1283 if (type != NULL)
1284 sstrncpy (n->type, type, sizeof (n->type));
1285 if (type_instance != NULL)
1286 sstrncpy (n->type_instance, type_instance,
1287 sizeof (n->type_instance));
1289 return (0);
1290 } /* int notification_init */
1292 int walk_directory (const char *dir, dirwalk_callback_f callback,
1293 void *user_data, int include_hidden)
1294 {
1295 struct dirent *ent;
1296 DIR *dh;
1297 int success;
1298 int failure;
1300 success = 0;
1301 failure = 0;
1303 if ((dh = opendir (dir)) == NULL)
1304 {
1305 char errbuf[1024];
1306 ERROR ("walk_directory: Cannot open '%s': %s", dir,
1307 sstrerror (errno, errbuf, sizeof (errbuf)));
1308 return -1;
1309 }
1311 while ((ent = readdir (dh)) != NULL)
1312 {
1313 int status;
1315 if (include_hidden)
1316 {
1317 if ((strcmp (".", ent->d_name) == 0)
1318 || (strcmp ("..", ent->d_name) == 0))
1319 continue;
1320 }
1321 else /* if (!include_hidden) */
1322 {
1323 if (ent->d_name[0]=='.')
1324 continue;
1325 }
1327 status = (*callback) (dir, ent->d_name, user_data);
1328 if (status != 0)
1329 failure++;
1330 else
1331 success++;
1332 }
1334 closedir (dh);
1336 if ((success == 0) && (failure > 0))
1337 return (-1);
1338 return (0);
1339 }
1341 ssize_t read_file_contents (const char *filename, char *buf, size_t bufsize)
1342 {
1343 FILE *fh;
1344 ssize_t ret;
1346 fh = fopen (filename, "r");
1347 if (fh == NULL)
1348 return (-1);
1350 ret = (ssize_t) fread (buf, 1, bufsize, fh);
1351 if ((ret == 0) && (ferror (fh) != 0))
1352 {
1353 ERROR ("read_file_contents: Reading file \"%s\" failed.",
1354 filename);
1355 ret = -1;
1356 }
1358 fclose(fh);
1359 return (ret);
1360 }
1362 counter_t counter_diff (counter_t old_value, counter_t new_value)
1363 {
1364 counter_t diff;
1366 if (old_value > new_value)
1367 {
1368 if (old_value <= 4294967295U)
1369 diff = (4294967295U - old_value) + new_value + 1;
1370 else
1371 diff = (18446744073709551615ULL - old_value) + new_value + 1;
1372 }
1373 else
1374 {
1375 diff = new_value - old_value;
1376 }
1378 return (diff);
1379 } /* counter_t counter_diff */
1381 int rate_to_value (value_t *ret_value, gauge_t rate, /* {{{ */
1382 rate_to_value_state_t *state,
1383 int ds_type, cdtime_t t)
1384 {
1385 gauge_t delta_gauge;
1386 cdtime_t delta_t;
1388 if (ds_type == DS_TYPE_GAUGE)
1389 {
1390 state->last_value.gauge = rate;
1391 state->last_time = t;
1393 *ret_value = state->last_value;
1394 return (0);
1395 }
1397 /* Counter and absolute can't handle negative rates. Reset "last time"
1398 * to zero, so that the next valid rate will re-initialize the
1399 * structure. */
1400 if ((rate < 0.0)
1401 && ((ds_type == DS_TYPE_COUNTER)
1402 || (ds_type == DS_TYPE_ABSOLUTE)))
1403 {
1404 memset (state, 0, sizeof (*state));
1405 return (EINVAL);
1406 }
1408 /* Another invalid state: The time is not increasing. */
1409 if (t <= state->last_time)
1410 {
1411 memset (state, 0, sizeof (*state));
1412 return (EINVAL);
1413 }
1415 delta_t = t - state->last_time;
1416 delta_gauge = (rate * CDTIME_T_TO_DOUBLE (delta_t)) + state->residual;
1418 /* Previous value is invalid. */
1419 if (state->last_time == 0) /* {{{ */
1420 {
1421 if (ds_type == DS_TYPE_DERIVE)
1422 {
1423 state->last_value.derive = (derive_t) rate;
1424 state->residual = rate - ((gauge_t) state->last_value.derive);
1425 }
1426 else if (ds_type == DS_TYPE_COUNTER)
1427 {
1428 state->last_value.counter = (counter_t) rate;
1429 state->residual = rate - ((gauge_t) state->last_value.counter);
1430 }
1431 else if (ds_type == DS_TYPE_ABSOLUTE)
1432 {
1433 state->last_value.absolute = (absolute_t) rate;
1434 state->residual = rate - ((gauge_t) state->last_value.absolute);
1435 }
1436 else
1437 {
1438 assert (23 == 42);
1439 }
1441 state->last_time = t;
1442 return (EAGAIN);
1443 } /* }}} */
1445 if (ds_type == DS_TYPE_DERIVE)
1446 {
1447 derive_t delta_derive = (derive_t) delta_gauge;
1449 state->last_value.derive += delta_derive;
1450 state->residual = delta_gauge - ((gauge_t) delta_derive);
1451 }
1452 else if (ds_type == DS_TYPE_COUNTER)
1453 {
1454 counter_t delta_counter = (counter_t) delta_gauge;
1456 state->last_value.counter += delta_counter;
1457 state->residual = delta_gauge - ((gauge_t) delta_counter);
1458 }
1459 else if (ds_type == DS_TYPE_ABSOLUTE)
1460 {
1461 absolute_t delta_absolute = (absolute_t) delta_gauge;
1463 state->last_value.absolute = delta_absolute;
1464 state->residual = delta_gauge - ((gauge_t) delta_absolute);
1465 }
1466 else
1467 {
1468 assert (23 == 42);
1469 }
1471 state->last_time = t;
1472 *ret_value = state->last_value;
1473 return (0);
1474 } /* }}} value_t rate_to_value */
1476 int value_to_rate (gauge_t *ret_rate, /* {{{ */
1477 value_t value, int ds_type, cdtime_t t, value_to_rate_state_t *state)
1478 {
1479 gauge_t interval;
1481 /* Another invalid state: The time is not increasing. */
1482 if (t <= state->last_time)
1483 {
1484 memset (state, 0, sizeof (*state));
1485 return (EINVAL);
1486 }
1488 interval = CDTIME_T_TO_DOUBLE(t - state->last_time);
1490 /* Previous value is invalid. */
1491 if (state->last_time == 0)
1492 {
1493 state->last_value = value;
1494 state->last_time = t;
1495 return (EAGAIN);
1496 }
1498 switch (ds_type) {
1499 case DS_TYPE_DERIVE: {
1500 derive_t diff = value.derive - state->last_value.derive;
1501 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1502 break;
1503 }
1504 case DS_TYPE_GAUGE: {
1505 *ret_rate = value.gauge;
1506 break;
1507 }
1508 case DS_TYPE_COUNTER: {
1509 counter_t diff = counter_diff (state->last_value.counter, value.counter);
1510 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1511 break;
1512 }
1513 case DS_TYPE_ABSOLUTE: {
1514 absolute_t diff = value.absolute;
1515 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1516 break;
1517 }
1518 default:
1519 return EINVAL;
1520 }
1522 state->last_value = value;
1523 state->last_time = t;
1524 return (0);
1525 } /* }}} value_t rate_to_value */
1527 int service_name_to_port_number (const char *service_name)
1528 {
1529 struct addrinfo *ai_list;
1530 int status;
1531 int service_number;
1533 if (service_name == NULL)
1534 return (-1);
1536 struct addrinfo ai_hints = {
1537 .ai_family = AF_UNSPEC
1538 };
1540 status = getaddrinfo (/* node = */ NULL, service_name,
1541 &ai_hints, &ai_list);
1542 if (status != 0)
1543 {
1544 ERROR ("service_name_to_port_number: getaddrinfo failed: %s",
1545 gai_strerror (status));
1546 return (-1);
1547 }
1549 service_number = -1;
1550 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1551 {
1552 if (ai_ptr->ai_family == AF_INET)
1553 {
1554 struct sockaddr_in *sa;
1556 sa = (void *) ai_ptr->ai_addr;
1557 service_number = (int) ntohs (sa->sin_port);
1558 }
1559 else if (ai_ptr->ai_family == AF_INET6)
1560 {
1561 struct sockaddr_in6 *sa;
1563 sa = (void *) ai_ptr->ai_addr;
1564 service_number = (int) ntohs (sa->sin6_port);
1565 }
1567 if ((service_number > 0) && (service_number <= 65535))
1568 break;
1569 }
1571 freeaddrinfo (ai_list);
1573 if ((service_number > 0) && (service_number <= 65535))
1574 return (service_number);
1575 return (-1);
1576 } /* int service_name_to_port_number */
1578 void set_sock_opts (int sockfd) /* {{{ */
1579 {
1580 int status;
1581 int socktype;
1583 socklen_t socklen = sizeof (socklen_t);
1584 int so_keepalive = 1;
1586 status = getsockopt (sockfd, SOL_SOCKET, SO_TYPE, &socktype, &socklen);
1587 if (status != 0)
1588 {
1589 WARNING ("set_sock_opts: failed to determine socket type");
1590 return;
1591 }
1593 if (socktype == SOCK_STREAM)
1594 {
1595 status = setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE,
1596 &so_keepalive, sizeof (so_keepalive));
1597 if (status != 0)
1598 WARNING ("set_sock_opts: failed to set socket keepalive flag");
1600 #ifdef TCP_KEEPIDLE
1601 int tcp_keepidle = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 100 + 1);
1602 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE,
1603 &tcp_keepidle, sizeof (tcp_keepidle));
1604 if (status != 0)
1605 WARNING ("set_sock_opts: failed to set socket tcp keepalive time");
1606 #endif
1608 #ifdef TCP_KEEPINTVL
1609 int tcp_keepintvl = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 1000 + 1);
1610 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL,
1611 &tcp_keepintvl, sizeof (tcp_keepintvl));
1612 if (status != 0)
1613 WARNING ("set_sock_opts: failed to set socket tcp keepalive interval");
1614 #endif
1615 }
1616 } /* }}} void set_sock_opts */
1618 int strtoderive (const char *string, derive_t *ret_value) /* {{{ */
1619 {
1620 derive_t tmp;
1621 char *endptr;
1623 if ((string == NULL) || (ret_value == NULL))
1624 return (EINVAL);
1626 errno = 0;
1627 endptr = NULL;
1628 tmp = (derive_t) strtoll (string, &endptr, /* base = */ 0);
1629 if ((endptr == string) || (errno != 0))
1630 return (-1);
1632 *ret_value = tmp;
1633 return (0);
1634 } /* }}} int strtoderive */
1636 int strtogauge (const char *string, gauge_t *ret_value) /* {{{ */
1637 {
1638 gauge_t tmp;
1639 char *endptr = NULL;
1641 if ((string == NULL) || (ret_value == NULL))
1642 return (EINVAL);
1644 errno = 0;
1645 endptr = NULL;
1646 tmp = (gauge_t) strtod (string, &endptr);
1647 if (errno != 0)
1648 return (errno);
1649 else if ((endptr == NULL) || (*endptr != 0))
1650 return (EINVAL);
1652 *ret_value = tmp;
1653 return (0);
1654 } /* }}} int strtogauge */
1656 int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str) /* {{{ */
1657 {
1658 char **array;
1659 size_t array_len = *ret_array_len;
1661 if (str == NULL)
1662 return (EINVAL);
1664 array = realloc (*ret_array,
1665 (array_len + 1) * sizeof (*array));
1666 if (array == NULL)
1667 return (ENOMEM);
1668 *ret_array = array;
1670 array[array_len] = strdup (str);
1671 if (array[array_len] == NULL)
1672 return (ENOMEM);
1674 array_len++;
1675 *ret_array_len = array_len;
1676 return (0);
1677 } /* }}} int strarray_add */
1679 void strarray_free (char **array, size_t array_len) /* {{{ */
1680 {
1681 for (size_t i = 0; i < array_len; i++)
1682 sfree (array[i]);
1683 sfree (array);
1684 } /* }}} void strarray_free */
1686 #ifdef HAVE_SYS_CAPABILITY_H
1687 int check_capability (int capability) /* {{{ */
1688 {
1689 #ifdef _LINUX_CAPABILITY_VERSION_3
1690 cap_user_header_t cap_header = calloc(1, sizeof (*cap_header));
1691 if (cap_header == NULL)
1692 {
1693 ERROR("check_capability: calloc failed");
1694 return (-1);
1695 }
1697 cap_user_data_t cap_data = calloc(1, sizeof (*cap_data));
1698 if (cap_data == NULL)
1699 {
1700 ERROR("check_capability: calloc failed");
1701 sfree(cap_header);
1702 return (-1);
1703 }
1705 cap_header->pid = getpid();
1706 cap_header->version = _LINUX_CAPABILITY_VERSION;
1707 if (capget(cap_header, cap_data) < 0)
1708 {
1709 ERROR("check_capability: capget failed");
1710 sfree(cap_header);
1711 sfree(cap_data);
1712 return (-1);
1713 }
1715 if ((cap_data->effective & (1 << capability)) == 0)
1716 {
1717 sfree(cap_header);
1718 sfree(cap_data);
1719 return (-1);
1720 }
1721 else
1722 {
1723 sfree(cap_header);
1724 sfree(cap_data);
1725 return (0);
1726 }
1727 #else
1728 WARNING ("check_capability: unsupported capability implementation. "
1729 "Some plugin(s) may require elevated privileges to work properly.");
1730 return (0);
1731 #endif /* _LINUX_CAPABILITY_VERSION_3 */
1732 } /* }}} int check_capability */
1733 #endif /* HAVE_SYS_CAPABILITY_H */