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 /* AIX doesn't have MSG_DONTWAIT */
72 #ifndef MSG_DONTWAIT
73 # define MSG_DONTWAIT MSG_NONBLOCK
74 #endif
76 #if !HAVE_GETPWNAM_R
77 static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
78 #endif
80 #if !HAVE_STRERROR_R
81 static pthread_mutex_t strerror_r_lock = PTHREAD_MUTEX_INITIALIZER;
82 #endif
84 char *sstrncpy (char *dest, const char *src, size_t n)
85 {
86 strncpy (dest, src, n);
87 dest[n - 1] = '\0';
89 return (dest);
90 } /* char *sstrncpy */
92 int ssnprintf (char *dest, size_t n, const char *format, ...)
93 {
94 int ret = 0;
95 va_list ap;
97 va_start (ap, format);
98 ret = vsnprintf (dest, n, format, ap);
99 dest[n - 1] = '\0';
100 va_end (ap);
102 return (ret);
103 } /* int ssnprintf */
105 char *ssnprintf_alloc (char const *format, ...) /* {{{ */
106 {
107 char static_buffer[1024] = "";
108 char *alloc_buffer;
109 size_t alloc_buffer_size;
110 int status;
111 va_list ap;
113 /* Try printing into the static buffer. In many cases it will be
114 * sufficiently large and we can simply return a strdup() of this
115 * buffer. */
116 va_start (ap, format);
117 status = vsnprintf (static_buffer, sizeof (static_buffer), format, ap);
118 va_end (ap);
119 if (status < 0)
120 return (NULL);
122 /* "status" does not include the null byte. */
123 alloc_buffer_size = (size_t) (status + 1);
124 if (alloc_buffer_size <= sizeof (static_buffer))
125 return (strdup (static_buffer));
127 /* Allocate a buffer large enough to hold the string. */
128 alloc_buffer = calloc (1, alloc_buffer_size);
129 if (alloc_buffer == NULL)
130 return (NULL);
132 /* Print again into this new buffer. */
133 va_start (ap, format);
134 status = vsnprintf (alloc_buffer, alloc_buffer_size, format, ap);
135 va_end (ap);
136 if (status < 0)
137 {
138 sfree (alloc_buffer);
139 return (NULL);
140 }
142 return (alloc_buffer);
143 } /* }}} char *ssnprintf_alloc */
145 char *sstrdup (const char *s)
146 {
147 char *r;
148 size_t sz;
150 if (s == NULL)
151 return (NULL);
153 /* Do not use `strdup' here, because it's not specified in POSIX. It's
154 * ``only'' an XSI extension. */
155 sz = strlen (s) + 1;
156 r = malloc (sz);
157 if (r == NULL)
158 {
159 ERROR ("sstrdup: Out of memory.");
160 exit (3);
161 }
162 memcpy (r, s, sizeof (char) * sz);
164 return (r);
165 } /* char *sstrdup */
167 /* Even though Posix requires "strerror_r" to return an "int",
168 * some systems (e.g. the GNU libc) return a "char *" _and_
169 * ignore the second argument ... -tokkee */
170 char *sstrerror (int errnum, char *buf, size_t buflen)
171 {
172 buf[0] = '\0';
174 #if !HAVE_STRERROR_R
175 {
176 char *temp;
178 pthread_mutex_lock (&strerror_r_lock);
180 temp = strerror (errnum);
181 sstrncpy (buf, temp, buflen);
183 pthread_mutex_unlock (&strerror_r_lock);
184 }
185 /* #endif !HAVE_STRERROR_R */
187 #elif STRERROR_R_CHAR_P
188 {
189 char *temp;
190 temp = strerror_r (errnum, buf, buflen);
191 if (buf[0] == '\0')
192 {
193 if ((temp != NULL) && (temp != buf) && (temp[0] != '\0'))
194 sstrncpy (buf, temp, buflen);
195 else
196 sstrncpy (buf, "strerror_r did not return "
197 "an error message", buflen);
198 }
199 }
200 /* #endif STRERROR_R_CHAR_P */
202 #else
203 if (strerror_r (errnum, buf, buflen) != 0)
204 {
205 ssnprintf (buf, buflen, "Error #%i; "
206 "Additionally, strerror_r failed.",
207 errnum);
208 }
209 #endif /* STRERROR_R_CHAR_P */
211 return (buf);
212 } /* char *sstrerror */
214 void *smalloc (size_t size)
215 {
216 void *r;
218 if ((r = malloc (size)) == NULL)
219 {
220 ERROR ("Not enough memory.");
221 exit (3);
222 }
224 return (r);
225 } /* void *smalloc */
227 #if 0
228 void sfree (void **ptr)
229 {
230 if (ptr == NULL)
231 return;
233 if (*ptr != NULL)
234 free (*ptr);
236 *ptr = NULL;
237 }
238 #endif
240 ssize_t sread (int fd, void *buf, size_t count)
241 {
242 char *ptr;
243 size_t nleft;
244 ssize_t status;
246 ptr = (char *) buf;
247 nleft = count;
249 while (nleft > 0)
250 {
251 status = read (fd, (void *) ptr, nleft);
253 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
254 continue;
256 if (status < 0)
257 return (status);
259 if (status == 0)
260 {
261 DEBUG ("Received EOF from fd %i. "
262 "Closing fd and returning error.",
263 fd);
264 close (fd);
265 return (-1);
266 }
268 assert ((0 > status) || (nleft >= (size_t)status));
270 nleft = nleft - ((size_t) status);
271 ptr = ptr + ((size_t) status);
272 }
274 return (0);
275 }
278 ssize_t swrite (int fd, const void *buf, size_t count)
279 {
280 const char *ptr;
281 size_t nleft;
282 ssize_t status;
283 struct pollfd pfd;
285 ptr = (const char *) buf;
286 nleft = count;
288 if (fd < 0)
289 return (-1);
291 /* checking for closed peer connection */
292 pfd.fd = fd;
293 pfd.events = POLLIN | POLLHUP;
294 pfd.revents = 0;
295 if (poll(&pfd, 1, 0) > 0) {
296 char buffer[32];
297 if (recv(fd, buffer, sizeof(buffer), MSG_PEEK | MSG_DONTWAIT) == 0) {
298 // if recv returns zero (even though poll() said there is data to be read),
299 // that means the connection has been closed
300 return -1;
301 }
302 }
304 while (nleft > 0)
305 {
306 status = write (fd, (const void *) ptr, nleft);
308 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
309 continue;
311 if (status < 0)
312 return (status);
314 nleft = nleft - ((size_t) status);
315 ptr = ptr + ((size_t) status);
316 }
318 return (0);
319 }
321 int strsplit (char *string, char **fields, size_t size)
322 {
323 size_t i;
324 char *ptr;
325 char *saveptr;
327 i = 0;
328 ptr = string;
329 saveptr = NULL;
330 while ((fields[i] = strtok_r (ptr, " \t\r\n", &saveptr)) != NULL)
331 {
332 ptr = NULL;
333 i++;
335 if (i >= size)
336 break;
337 }
339 return ((int) i);
340 }
342 int strjoin(char *buffer, size_t buffer_size, char **fields, size_t fields_num,
343 const char *sep) {
344 size_t avail = 0;
345 char *ptr = buffer;
346 size_t sep_len = 0;
348 size_t buffer_req = 0;
350 if (((fields_num != 0) && (fields == NULL)) ||
351 ((buffer_size != 0) && (buffer == NULL)))
352 return (-EINVAL);
354 if (buffer != NULL)
355 buffer[0] = 0;
357 if (buffer_size != 0)
358 avail = buffer_size - 1;
360 if (sep != NULL)
361 sep_len = strlen(sep);
363 for (size_t i = 0; i < fields_num; i++) {
364 size_t field_len = strlen(fields[i]);
366 if (i != 0)
367 buffer_req += sep_len;
368 buffer_req += field_len;
370 if ((i != 0) && (sep_len > 0)) {
371 if (sep_len >= avail) {
372 /* prevent subsequent iterations from writing to the
373 * buffer. */
374 avail = 0;
375 continue;
376 }
378 memcpy(ptr, sep, sep_len);
380 ptr += sep_len;
381 avail -= sep_len;
382 }
384 if (field_len > avail)
385 field_len = avail;
387 memcpy(ptr, fields[i], field_len);
388 ptr += field_len;
390 avail -= field_len;
391 if (ptr != NULL)
392 *ptr = 0;
393 }
395 return (int)buffer_req;
396 }
398 int escape_string (char *buffer, size_t buffer_size)
399 {
400 char *temp;
401 size_t j;
403 /* Check if we need to escape at all first */
404 temp = strpbrk (buffer, " \t\"\\");
405 if (temp == NULL)
406 return (0);
408 if (buffer_size < 3)
409 return (EINVAL);
411 temp = calloc (1, buffer_size);
412 if (temp == NULL)
413 return (ENOMEM);
415 temp[0] = '"';
416 j = 1;
418 for (size_t i = 0; i < buffer_size; i++)
419 {
420 if (buffer[i] == 0)
421 {
422 break;
423 }
424 else if ((buffer[i] == '"') || (buffer[i] == '\\'))
425 {
426 if (j > (buffer_size - 4))
427 break;
428 temp[j] = '\\';
429 temp[j + 1] = buffer[i];
430 j += 2;
431 }
432 else
433 {
434 if (j > (buffer_size - 3))
435 break;
436 temp[j] = buffer[i];
437 j++;
438 }
439 }
441 assert ((j + 1) < buffer_size);
442 temp[j] = '"';
443 temp[j + 1] = 0;
445 sstrncpy (buffer, temp, buffer_size);
446 sfree (temp);
447 return (0);
448 } /* int escape_string */
450 int strunescape (char *buf, size_t buf_len)
451 {
452 for (size_t i = 0; (i < buf_len) && (buf[i] != '\0'); ++i)
453 {
454 if (buf[i] != '\\')
455 continue;
457 if (((i + 1) >= buf_len) || (buf[i + 1] == 0)) {
458 ERROR ("string unescape: backslash found at end of string.");
459 /* Ensure null-byte at the end of the buffer. */
460 buf[i] = 0;
461 return (-1);
462 }
464 switch (buf[i + 1]) {
465 case 't':
466 buf[i] = '\t';
467 break;
468 case 'n':
469 buf[i] = '\n';
470 break;
471 case 'r':
472 buf[i] = '\r';
473 break;
474 default:
475 buf[i] = buf[i + 1];
476 break;
477 }
479 /* Move everything after the position one position to the left.
480 * Add a null-byte as last character in the buffer. */
481 memmove (buf + i + 1, buf + i + 2, buf_len - i - 2);
482 buf[buf_len - 1] = 0;
483 }
484 return (0);
485 } /* int strunescape */
487 size_t strstripnewline (char *buffer)
488 {
489 size_t buffer_len = strlen (buffer);
491 while (buffer_len > 0)
492 {
493 if ((buffer[buffer_len - 1] != '\n')
494 && (buffer[buffer_len - 1] != '\r'))
495 break;
496 buffer_len--;
497 buffer[buffer_len] = 0;
498 }
500 return (buffer_len);
501 } /* size_t strstripnewline */
503 int escape_slashes (char *buffer, size_t buffer_size)
504 {
505 size_t buffer_len;
507 buffer_len = strlen (buffer);
509 if (buffer_len <= 1)
510 {
511 if (strcmp ("/", buffer) == 0)
512 {
513 if (buffer_size < 5)
514 return (-1);
515 sstrncpy (buffer, "root", buffer_size);
516 }
517 return (0);
518 }
520 /* Move one to the left */
521 if (buffer[0] == '/')
522 {
523 memmove (buffer, buffer + 1, buffer_len);
524 buffer_len--;
525 }
527 for (size_t i = 0; i < buffer_len; i++)
528 {
529 if (buffer[i] == '/')
530 buffer[i] = '_';
531 }
533 return (0);
534 } /* int escape_slashes */
536 void replace_special (char *buffer, size_t buffer_size)
537 {
538 for (size_t i = 0; i < buffer_size; i++)
539 {
540 if (buffer[i] == 0)
541 return;
542 if ((!isalnum ((int) buffer[i])) && (buffer[i] != '-'))
543 buffer[i] = '_';
544 }
545 } /* void replace_special */
547 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
548 {
549 struct timeval *larger;
550 struct timeval *smaller;
552 int status;
554 NORMALIZE_TIMEVAL (tv0);
555 NORMALIZE_TIMEVAL (tv1);
557 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
558 {
559 if (delta != NULL) {
560 delta->tv_sec = 0;
561 delta->tv_usec = 0;
562 }
563 return (0);
564 }
566 if ((tv0.tv_sec < tv1.tv_sec)
567 || ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
568 {
569 larger = &tv1;
570 smaller = &tv0;
571 status = -1;
572 }
573 else
574 {
575 larger = &tv0;
576 smaller = &tv1;
577 status = 1;
578 }
580 if (delta != NULL) {
581 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
583 if (smaller->tv_usec <= larger->tv_usec)
584 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
585 else
586 {
587 --delta->tv_sec;
588 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
589 }
590 }
592 assert ((delta == NULL)
593 || ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
595 return (status);
596 } /* int timeval_cmp */
598 int check_create_dir (const char *file_orig)
599 {
600 struct stat statbuf;
602 char file_copy[512];
603 char dir[512];
604 int dir_len = 512;
605 char *fields[16];
606 int fields_num;
607 char *ptr;
608 char *saveptr;
609 int last_is_file = 1;
610 int path_is_absolute = 0;
611 size_t len;
613 /*
614 * Sanity checks first
615 */
616 if (file_orig == NULL)
617 return (-1);
619 if ((len = strlen (file_orig)) < 1)
620 return (-1);
621 else if (len >= sizeof (file_copy))
622 return (-1);
624 /*
625 * If `file_orig' ends in a slash the last component is a directory,
626 * otherwise it's a file. Act accordingly..
627 */
628 if (file_orig[len - 1] == '/')
629 last_is_file = 0;
630 if (file_orig[0] == '/')
631 path_is_absolute = 1;
633 /*
634 * Create a copy for `strtok_r' to destroy
635 */
636 sstrncpy (file_copy, file_orig, sizeof (file_copy));
638 /*
639 * Break into components. This will eat up several slashes in a row and
640 * remove leading and trailing slashes..
641 */
642 ptr = file_copy;
643 saveptr = NULL;
644 fields_num = 0;
645 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
646 {
647 ptr = NULL;
648 fields_num++;
650 if (fields_num >= 16)
651 break;
652 }
654 /*
655 * For each component, do..
656 */
657 for (int i = 0; i < (fields_num - last_is_file); i++)
658 {
659 /*
660 * Do not create directories that start with a dot. This
661 * prevents `../../' attacks and other likely malicious
662 * behavior.
663 */
664 if (fields[i][0] == '.')
665 {
666 ERROR ("Cowardly refusing to create a directory that "
667 "begins with a `.' (dot): `%s'", file_orig);
668 return (-2);
669 }
671 /*
672 * Join the components together again
673 */
674 dir[0] = '/';
675 if (strjoin (dir + path_is_absolute, (size_t) (dir_len - path_is_absolute),
676 fields, (size_t) (i + 1), "/") < 0)
677 {
678 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
679 return (-1);
680 }
682 while (42) {
683 if ((stat (dir, &statbuf) == -1)
684 && (lstat (dir, &statbuf) == -1))
685 {
686 if (errno == ENOENT)
687 {
688 if (mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0)
689 break;
691 /* this might happen, if a different thread created
692 * the directory in the meantime
693 * => call stat() again to check for S_ISDIR() */
694 if (EEXIST == errno)
695 continue;
697 char errbuf[1024];
698 ERROR ("check_create_dir: mkdir (%s): %s", dir,
699 sstrerror (errno,
700 errbuf, sizeof (errbuf)));
701 return (-1);
702 }
703 else
704 {
705 char errbuf[1024];
706 ERROR ("check_create_dir: stat (%s): %s", dir,
707 sstrerror (errno, errbuf,
708 sizeof (errbuf)));
709 return (-1);
710 }
711 }
712 else if (!S_ISDIR (statbuf.st_mode))
713 {
714 ERROR ("check_create_dir: `%s' exists but is not "
715 "a directory!", dir);
716 return (-1);
717 }
718 break;
719 }
720 }
722 return (0);
723 } /* check_create_dir */
725 #ifdef HAVE_LIBKSTAT
726 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
727 {
728 char ident[128];
730 *ksp_ptr = NULL;
732 if (kc == NULL)
733 return (-1);
735 ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
737 *ksp_ptr = kstat_lookup (kc, module, instance, name);
738 if (*ksp_ptr == NULL)
739 {
740 ERROR ("get_kstat: Cound not find kstat %s", ident);
741 return (-1);
742 }
744 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
745 {
746 ERROR ("get_kstat: kstat %s has wrong type", ident);
747 *ksp_ptr = NULL;
748 return (-1);
749 }
751 #ifdef assert
752 assert (*ksp_ptr != NULL);
753 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
754 #endif
756 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
757 {
758 ERROR ("get_kstat: kstat %s could not be read", ident);
759 return (-1);
760 }
762 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
763 {
764 ERROR ("get_kstat: kstat %s has wrong type", ident);
765 return (-1);
766 }
768 return (0);
769 }
771 long long get_kstat_value (kstat_t *ksp, char *name)
772 {
773 kstat_named_t *kn;
774 long long retval = -1LL;
776 if (ksp == NULL)
777 {
778 ERROR ("get_kstat_value (\"%s\"): ksp is NULL.", name);
779 return (-1LL);
780 }
781 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
782 {
783 ERROR ("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
784 "is not KSTAT_TYPE_NAMED (%#x).",
785 name,
786 (unsigned int) ksp->ks_type,
787 (unsigned int) KSTAT_TYPE_NAMED);
788 return (-1LL);
789 }
791 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
792 return (-1LL);
794 if (kn->data_type == KSTAT_DATA_INT32)
795 retval = (long long) kn->value.i32;
796 else if (kn->data_type == KSTAT_DATA_UINT32)
797 retval = (long long) kn->value.ui32;
798 else if (kn->data_type == KSTAT_DATA_INT64)
799 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
800 else if (kn->data_type == KSTAT_DATA_UINT64)
801 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
802 else
803 WARNING ("get_kstat_value: Not a numeric value: %s", name);
805 return (retval);
806 }
807 #endif /* HAVE_LIBKSTAT */
809 #ifndef HAVE_HTONLL
810 unsigned long long ntohll (unsigned long long n)
811 {
812 #if BYTE_ORDER == BIG_ENDIAN
813 return (n);
814 #else
815 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
816 #endif
817 } /* unsigned long long ntohll */
819 unsigned long long htonll (unsigned long long n)
820 {
821 #if BYTE_ORDER == BIG_ENDIAN
822 return (n);
823 #else
824 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
825 #endif
826 } /* unsigned long long htonll */
827 #endif /* HAVE_HTONLL */
829 #if FP_LAYOUT_NEED_NOTHING
830 /* Well, we need nothing.. */
831 /* #endif FP_LAYOUT_NEED_NOTHING */
833 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
834 # if FP_LAYOUT_NEED_ENDIANFLIP
835 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
836 (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
837 (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
838 (((uint64_t)(A) & 0x000000ff00000000LL) >> 8) | \
839 (((uint64_t)(A) & 0x00000000ff000000LL) << 8) | \
840 (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
841 (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
842 (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
843 # else
844 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
845 (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
846 # endif
848 double ntohd (double d)
849 {
850 union
851 {
852 uint8_t byte[8];
853 uint64_t integer;
854 double floating;
855 } ret;
857 ret.floating = d;
859 /* NAN in x86 byte order */
860 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
861 && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
862 && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
863 && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
864 {
865 return (NAN);
866 }
867 else
868 {
869 uint64_t tmp;
871 tmp = ret.integer;
872 ret.integer = FP_CONVERT (tmp);
873 return (ret.floating);
874 }
875 } /* double ntohd */
877 double htond (double d)
878 {
879 union
880 {
881 uint8_t byte[8];
882 uint64_t integer;
883 double floating;
884 } ret;
886 if (isnan (d))
887 {
888 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
889 ret.byte[4] = ret.byte[5] = 0x00;
890 ret.byte[6] = 0xf8;
891 ret.byte[7] = 0x7f;
892 return (ret.floating);
893 }
894 else
895 {
896 uint64_t tmp;
898 ret.floating = d;
899 tmp = FP_CONVERT (ret.integer);
900 ret.integer = tmp;
901 return (ret.floating);
902 }
903 } /* double htond */
904 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
906 int format_name (char *ret, int ret_len,
907 const char *hostname,
908 const char *plugin, const char *plugin_instance,
909 const char *type, const char *type_instance)
910 {
911 char *buffer;
912 size_t buffer_size;
914 buffer = ret;
915 buffer_size = (size_t) ret_len;
917 #define APPEND(str) do { \
918 size_t l = strlen (str); \
919 if (l >= buffer_size) \
920 return (ENOBUFS); \
921 memcpy (buffer, (str), l); \
922 buffer += l; buffer_size -= l; \
923 } while (0)
925 assert (plugin != NULL);
926 assert (type != NULL);
928 APPEND (hostname);
929 APPEND ("/");
930 APPEND (plugin);
931 if ((plugin_instance != NULL) && (plugin_instance[0] != 0))
932 {
933 APPEND ("-");
934 APPEND (plugin_instance);
935 }
936 APPEND ("/");
937 APPEND (type);
938 if ((type_instance != NULL) && (type_instance[0] != 0))
939 {
940 APPEND ("-");
941 APPEND (type_instance);
942 }
943 assert (buffer_size > 0);
944 buffer[0] = 0;
946 #undef APPEND
947 return (0);
948 } /* int format_name */
950 int format_values (char *ret, size_t ret_len, /* {{{ */
951 const data_set_t *ds, const value_list_t *vl,
952 _Bool store_rates)
953 {
954 size_t offset = 0;
955 int status;
956 gauge_t *rates = NULL;
958 assert (0 == strcmp (ds->type, vl->type));
960 memset (ret, 0, ret_len);
962 #define BUFFER_ADD(...) do { \
963 status = ssnprintf (ret + offset, ret_len - offset, \
964 __VA_ARGS__); \
965 if (status < 1) \
966 { \
967 sfree (rates); \
968 return (-1); \
969 } \
970 else if (((size_t) status) >= (ret_len - offset)) \
971 { \
972 sfree (rates); \
973 return (-1); \
974 } \
975 else \
976 offset += ((size_t) status); \
977 } while (0)
979 BUFFER_ADD ("%.3f", CDTIME_T_TO_DOUBLE (vl->time));
981 for (size_t i = 0; i < ds->ds_num; i++)
982 {
983 if (ds->ds[i].type == DS_TYPE_GAUGE)
984 BUFFER_ADD (":"GAUGE_FORMAT, vl->values[i].gauge);
985 else if (store_rates)
986 {
987 if (rates == NULL)
988 rates = uc_get_rate (ds, vl);
989 if (rates == NULL)
990 {
991 WARNING ("format_values: uc_get_rate failed.");
992 return (-1);
993 }
994 BUFFER_ADD (":"GAUGE_FORMAT, rates[i]);
995 }
996 else if (ds->ds[i].type == DS_TYPE_COUNTER)
997 BUFFER_ADD (":%llu", vl->values[i].counter);
998 else if (ds->ds[i].type == DS_TYPE_DERIVE)
999 BUFFER_ADD (":%"PRIi64, vl->values[i].derive);
1000 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
1001 BUFFER_ADD (":%"PRIu64, vl->values[i].absolute);
1002 else
1003 {
1004 ERROR ("format_values: Unknown data source type: %i",
1005 ds->ds[i].type);
1006 sfree (rates);
1007 return (-1);
1008 }
1009 } /* for ds->ds_num */
1011 #undef BUFFER_ADD
1013 sfree (rates);
1014 return (0);
1015 } /* }}} int format_values */
1017 int parse_identifier (char *str, char **ret_host,
1018 char **ret_plugin, char **ret_plugin_instance,
1019 char **ret_type, char **ret_type_instance)
1020 {
1021 char *hostname = NULL;
1022 char *plugin = NULL;
1023 char *plugin_instance = NULL;
1024 char *type = NULL;
1025 char *type_instance = NULL;
1027 hostname = str;
1028 if (hostname == NULL)
1029 return (-1);
1031 plugin = strchr (hostname, '/');
1032 if (plugin == NULL)
1033 return (-1);
1034 *plugin = '\0'; plugin++;
1036 type = strchr (plugin, '/');
1037 if (type == NULL)
1038 return (-1);
1039 *type = '\0'; type++;
1041 plugin_instance = strchr (plugin, '-');
1042 if (plugin_instance != NULL)
1043 {
1044 *plugin_instance = '\0';
1045 plugin_instance++;
1046 }
1048 type_instance = strchr (type, '-');
1049 if (type_instance != NULL)
1050 {
1051 *type_instance = '\0';
1052 type_instance++;
1053 }
1055 *ret_host = hostname;
1056 *ret_plugin = plugin;
1057 *ret_plugin_instance = plugin_instance;
1058 *ret_type = type;
1059 *ret_type_instance = type_instance;
1060 return (0);
1061 } /* int parse_identifier */
1063 int parse_identifier_vl (const char *str, value_list_t *vl) /* {{{ */
1064 {
1065 char str_copy[6 * DATA_MAX_NAME_LEN];
1066 char *host = NULL;
1067 char *plugin = NULL;
1068 char *plugin_instance = NULL;
1069 char *type = NULL;
1070 char *type_instance = NULL;
1071 int status;
1073 if ((str == NULL) || (vl == NULL))
1074 return (EINVAL);
1076 sstrncpy (str_copy, str, sizeof (str_copy));
1078 status = parse_identifier (str_copy, &host,
1079 &plugin, &plugin_instance,
1080 &type, &type_instance);
1081 if (status != 0)
1082 return (status);
1084 sstrncpy (vl->host, host, sizeof (vl->host));
1085 sstrncpy (vl->plugin, plugin, sizeof (vl->plugin));
1086 sstrncpy (vl->plugin_instance,
1087 (plugin_instance != NULL) ? plugin_instance : "",
1088 sizeof (vl->plugin_instance));
1089 sstrncpy (vl->type, type, sizeof (vl->type));
1090 sstrncpy (vl->type_instance,
1091 (type_instance != NULL) ? type_instance : "",
1092 sizeof (vl->type_instance));
1094 return (0);
1095 } /* }}} int parse_identifier_vl */
1097 int parse_value (const char *value_orig, value_t *ret_value, int ds_type)
1098 {
1099 char *value;
1100 char *endptr = NULL;
1101 size_t value_len;
1103 if (value_orig == NULL)
1104 return (EINVAL);
1106 value = strdup (value_orig);
1107 if (value == NULL)
1108 return (ENOMEM);
1109 value_len = strlen (value);
1111 while ((value_len > 0) && isspace ((int) value[value_len - 1]))
1112 {
1113 value[value_len - 1] = 0;
1114 value_len--;
1115 }
1117 switch (ds_type)
1118 {
1119 case DS_TYPE_COUNTER:
1120 ret_value->counter = (counter_t) strtoull (value, &endptr, 0);
1121 break;
1123 case DS_TYPE_GAUGE:
1124 ret_value->gauge = (gauge_t) strtod (value, &endptr);
1125 break;
1127 case DS_TYPE_DERIVE:
1128 ret_value->derive = (derive_t) strtoll (value, &endptr, 0);
1129 break;
1131 case DS_TYPE_ABSOLUTE:
1132 ret_value->absolute = (absolute_t) strtoull (value, &endptr, 0);
1133 break;
1135 default:
1136 sfree (value);
1137 ERROR ("parse_value: Invalid data source type: %i.", ds_type);
1138 return -1;
1139 }
1141 if (value == endptr) {
1142 ERROR ("parse_value: Failed to parse string as %s: \"%s\".",
1143 DS_TYPE_TO_STRING (ds_type), value);
1144 sfree (value);
1145 return -1;
1146 }
1147 else if ((NULL != endptr) && ('\0' != *endptr))
1148 INFO ("parse_value: Ignoring trailing garbage \"%s\" after %s value. "
1149 "Input string was \"%s\".",
1150 endptr, DS_TYPE_TO_STRING (ds_type), value_orig);
1152 sfree (value);
1153 return 0;
1154 } /* int parse_value */
1156 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
1157 {
1158 size_t i;
1159 char *dummy;
1160 char *ptr;
1161 char *saveptr;
1163 if ((buffer == NULL) || (vl == NULL) || (ds == NULL))
1164 return EINVAL;
1166 i = 0;
1167 dummy = buffer;
1168 saveptr = NULL;
1169 vl->time = 0;
1170 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
1171 {
1172 dummy = NULL;
1174 if (i >= vl->values_len)
1175 {
1176 /* Make sure i is invalid. */
1177 i = 0;
1178 break;
1179 }
1181 if (vl->time == 0)
1182 {
1183 if (strcmp ("N", ptr) == 0)
1184 vl->time = cdtime ();
1185 else
1186 {
1187 char *endptr = NULL;
1188 double tmp;
1190 errno = 0;
1191 tmp = strtod (ptr, &endptr);
1192 if ((errno != 0) /* Overflow */
1193 || (endptr == ptr) /* Invalid string */
1194 || (endptr == NULL) /* This should not happen */
1195 || (*endptr != 0)) /* Trailing chars */
1196 return (-1);
1198 vl->time = DOUBLE_TO_CDTIME_T (tmp);
1199 }
1201 continue;
1202 }
1204 if ((strcmp ("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
1205 vl->values[i].gauge = NAN;
1206 else if (0 != parse_value (ptr, &vl->values[i], ds->ds[i].type))
1207 return -1;
1209 i++;
1210 } /* while (strtok_r) */
1212 if ((ptr != NULL) || (i == 0))
1213 return (-1);
1214 return (0);
1215 } /* int parse_values */
1217 int parse_value_file (char const *path, value_t *ret_value, int ds_type)
1218 {
1219 FILE *fh;
1220 char buffer[256];
1222 fh = fopen (path, "r");
1223 if (fh == NULL)
1224 return (-1);
1226 if (fgets (buffer, sizeof (buffer), fh) == NULL)
1227 {
1228 fclose (fh);
1229 return (-1);
1230 }
1232 fclose (fh);
1234 strstripnewline (buffer);
1236 return parse_value (buffer, ret_value, ds_type);
1237 } /* int parse_value_file */
1239 #if !HAVE_GETPWNAM_R
1240 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
1241 size_t buflen, struct passwd **pwbufp)
1242 {
1243 int status = 0;
1244 struct passwd *pw;
1246 memset (pwbuf, '\0', sizeof (struct passwd));
1248 pthread_mutex_lock (&getpwnam_r_lock);
1250 do
1251 {
1252 pw = getpwnam (name);
1253 if (pw == NULL)
1254 {
1255 status = (errno != 0) ? errno : ENOENT;
1256 break;
1257 }
1259 #define GETPWNAM_COPY_MEMBER(member) \
1260 if (pw->member != NULL) \
1261 { \
1262 int len = strlen (pw->member); \
1263 if (len >= buflen) \
1264 { \
1265 status = ENOMEM; \
1266 break; \
1267 } \
1268 sstrncpy (buf, pw->member, buflen); \
1269 pwbuf->member = buf; \
1270 buf += (len + 1); \
1271 buflen -= (len + 1); \
1272 }
1273 GETPWNAM_COPY_MEMBER(pw_name);
1274 GETPWNAM_COPY_MEMBER(pw_passwd);
1275 GETPWNAM_COPY_MEMBER(pw_gecos);
1276 GETPWNAM_COPY_MEMBER(pw_dir);
1277 GETPWNAM_COPY_MEMBER(pw_shell);
1279 pwbuf->pw_uid = pw->pw_uid;
1280 pwbuf->pw_gid = pw->pw_gid;
1282 if (pwbufp != NULL)
1283 *pwbufp = pwbuf;
1284 } while (0);
1286 pthread_mutex_unlock (&getpwnam_r_lock);
1288 return (status);
1289 } /* int getpwnam_r */
1290 #endif /* !HAVE_GETPWNAM_R */
1292 int notification_init (notification_t *n, int severity, const char *message,
1293 const char *host,
1294 const char *plugin, const char *plugin_instance,
1295 const char *type, const char *type_instance)
1296 {
1297 memset (n, '\0', sizeof (notification_t));
1299 n->severity = severity;
1301 if (message != NULL)
1302 sstrncpy (n->message, message, sizeof (n->message));
1303 if (host != NULL)
1304 sstrncpy (n->host, host, sizeof (n->host));
1305 if (plugin != NULL)
1306 sstrncpy (n->plugin, plugin, sizeof (n->plugin));
1307 if (plugin_instance != NULL)
1308 sstrncpy (n->plugin_instance, plugin_instance,
1309 sizeof (n->plugin_instance));
1310 if (type != NULL)
1311 sstrncpy (n->type, type, sizeof (n->type));
1312 if (type_instance != NULL)
1313 sstrncpy (n->type_instance, type_instance,
1314 sizeof (n->type_instance));
1316 return (0);
1317 } /* int notification_init */
1319 int walk_directory (const char *dir, dirwalk_callback_f callback,
1320 void *user_data, int include_hidden)
1321 {
1322 struct dirent *ent;
1323 DIR *dh;
1324 int success;
1325 int failure;
1327 success = 0;
1328 failure = 0;
1330 if ((dh = opendir (dir)) == NULL)
1331 {
1332 char errbuf[1024];
1333 ERROR ("walk_directory: Cannot open '%s': %s", dir,
1334 sstrerror (errno, errbuf, sizeof (errbuf)));
1335 return -1;
1336 }
1338 while ((ent = readdir (dh)) != NULL)
1339 {
1340 int status;
1342 if (include_hidden)
1343 {
1344 if ((strcmp (".", ent->d_name) == 0)
1345 || (strcmp ("..", ent->d_name) == 0))
1346 continue;
1347 }
1348 else /* if (!include_hidden) */
1349 {
1350 if (ent->d_name[0]=='.')
1351 continue;
1352 }
1354 status = (*callback) (dir, ent->d_name, user_data);
1355 if (status != 0)
1356 failure++;
1357 else
1358 success++;
1359 }
1361 closedir (dh);
1363 if ((success == 0) && (failure > 0))
1364 return (-1);
1365 return (0);
1366 }
1368 ssize_t read_file_contents (const char *filename, char *buf, size_t bufsize)
1369 {
1370 FILE *fh;
1371 ssize_t ret;
1373 fh = fopen (filename, "r");
1374 if (fh == NULL)
1375 return (-1);
1377 ret = (ssize_t) fread (buf, 1, bufsize, fh);
1378 if ((ret == 0) && (ferror (fh) != 0))
1379 {
1380 ERROR ("read_file_contents: Reading file \"%s\" failed.",
1381 filename);
1382 ret = -1;
1383 }
1385 fclose(fh);
1386 return (ret);
1387 }
1389 counter_t counter_diff (counter_t old_value, counter_t new_value)
1390 {
1391 counter_t diff;
1393 if (old_value > new_value)
1394 {
1395 if (old_value <= 4294967295U)
1396 diff = (4294967295U - old_value) + new_value + 1;
1397 else
1398 diff = (18446744073709551615ULL - old_value) + new_value + 1;
1399 }
1400 else
1401 {
1402 diff = new_value - old_value;
1403 }
1405 return (diff);
1406 } /* counter_t counter_diff */
1408 int rate_to_value (value_t *ret_value, gauge_t rate, /* {{{ */
1409 rate_to_value_state_t *state,
1410 int ds_type, cdtime_t t)
1411 {
1412 gauge_t delta_gauge;
1413 cdtime_t delta_t;
1415 if (ds_type == DS_TYPE_GAUGE)
1416 {
1417 state->last_value.gauge = rate;
1418 state->last_time = t;
1420 *ret_value = state->last_value;
1421 return (0);
1422 }
1424 /* Counter and absolute can't handle negative rates. Reset "last time"
1425 * to zero, so that the next valid rate will re-initialize the
1426 * structure. */
1427 if ((rate < 0.0)
1428 && ((ds_type == DS_TYPE_COUNTER)
1429 || (ds_type == DS_TYPE_ABSOLUTE)))
1430 {
1431 memset (state, 0, sizeof (*state));
1432 return (EINVAL);
1433 }
1435 /* Another invalid state: The time is not increasing. */
1436 if (t <= state->last_time)
1437 {
1438 memset (state, 0, sizeof (*state));
1439 return (EINVAL);
1440 }
1442 delta_t = t - state->last_time;
1443 delta_gauge = (rate * CDTIME_T_TO_DOUBLE (delta_t)) + state->residual;
1445 /* Previous value is invalid. */
1446 if (state->last_time == 0) /* {{{ */
1447 {
1448 if (ds_type == DS_TYPE_DERIVE)
1449 {
1450 state->last_value.derive = (derive_t) rate;
1451 state->residual = rate - ((gauge_t) state->last_value.derive);
1452 }
1453 else if (ds_type == DS_TYPE_COUNTER)
1454 {
1455 state->last_value.counter = (counter_t) rate;
1456 state->residual = rate - ((gauge_t) state->last_value.counter);
1457 }
1458 else if (ds_type == DS_TYPE_ABSOLUTE)
1459 {
1460 state->last_value.absolute = (absolute_t) rate;
1461 state->residual = rate - ((gauge_t) state->last_value.absolute);
1462 }
1463 else
1464 {
1465 assert (23 == 42);
1466 }
1468 state->last_time = t;
1469 return (EAGAIN);
1470 } /* }}} */
1472 if (ds_type == DS_TYPE_DERIVE)
1473 {
1474 derive_t delta_derive = (derive_t) delta_gauge;
1476 state->last_value.derive += delta_derive;
1477 state->residual = delta_gauge - ((gauge_t) delta_derive);
1478 }
1479 else if (ds_type == DS_TYPE_COUNTER)
1480 {
1481 counter_t delta_counter = (counter_t) delta_gauge;
1483 state->last_value.counter += delta_counter;
1484 state->residual = delta_gauge - ((gauge_t) delta_counter);
1485 }
1486 else if (ds_type == DS_TYPE_ABSOLUTE)
1487 {
1488 absolute_t delta_absolute = (absolute_t) delta_gauge;
1490 state->last_value.absolute = delta_absolute;
1491 state->residual = delta_gauge - ((gauge_t) delta_absolute);
1492 }
1493 else
1494 {
1495 assert (23 == 42);
1496 }
1498 state->last_time = t;
1499 *ret_value = state->last_value;
1500 return (0);
1501 } /* }}} value_t rate_to_value */
1503 int value_to_rate (gauge_t *ret_rate, /* {{{ */
1504 value_t value, int ds_type, cdtime_t t, value_to_rate_state_t *state)
1505 {
1506 gauge_t interval;
1508 /* Another invalid state: The time is not increasing. */
1509 if (t <= state->last_time)
1510 {
1511 memset (state, 0, sizeof (*state));
1512 return (EINVAL);
1513 }
1515 interval = CDTIME_T_TO_DOUBLE(t - state->last_time);
1517 /* Previous value is invalid. */
1518 if (state->last_time == 0)
1519 {
1520 state->last_value = value;
1521 state->last_time = t;
1522 return (EAGAIN);
1523 }
1525 switch (ds_type) {
1526 case DS_TYPE_DERIVE: {
1527 derive_t diff = value.derive - state->last_value.derive;
1528 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1529 break;
1530 }
1531 case DS_TYPE_GAUGE: {
1532 *ret_rate = value.gauge;
1533 break;
1534 }
1535 case DS_TYPE_COUNTER: {
1536 counter_t diff = counter_diff (state->last_value.counter, value.counter);
1537 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1538 break;
1539 }
1540 case DS_TYPE_ABSOLUTE: {
1541 absolute_t diff = value.absolute;
1542 *ret_rate = ((gauge_t) diff) / ((gauge_t) interval);
1543 break;
1544 }
1545 default:
1546 return EINVAL;
1547 }
1549 state->last_value = value;
1550 state->last_time = t;
1551 return (0);
1552 } /* }}} value_t rate_to_value */
1554 int service_name_to_port_number (const char *service_name)
1555 {
1556 struct addrinfo *ai_list;
1557 int status;
1558 int service_number;
1560 if (service_name == NULL)
1561 return (-1);
1563 struct addrinfo ai_hints = {
1564 .ai_family = AF_UNSPEC
1565 };
1567 status = getaddrinfo (/* node = */ NULL, service_name,
1568 &ai_hints, &ai_list);
1569 if (status != 0)
1570 {
1571 ERROR ("service_name_to_port_number: getaddrinfo failed: %s",
1572 gai_strerror (status));
1573 return (-1);
1574 }
1576 service_number = -1;
1577 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1578 {
1579 if (ai_ptr->ai_family == AF_INET)
1580 {
1581 struct sockaddr_in *sa;
1583 sa = (void *) ai_ptr->ai_addr;
1584 service_number = (int) ntohs (sa->sin_port);
1585 }
1586 else if (ai_ptr->ai_family == AF_INET6)
1587 {
1588 struct sockaddr_in6 *sa;
1590 sa = (void *) ai_ptr->ai_addr;
1591 service_number = (int) ntohs (sa->sin6_port);
1592 }
1594 if ((service_number > 0) && (service_number <= 65535))
1595 break;
1596 }
1598 freeaddrinfo (ai_list);
1600 if ((service_number > 0) && (service_number <= 65535))
1601 return (service_number);
1602 return (-1);
1603 } /* int service_name_to_port_number */
1605 void set_sock_opts (int sockfd) /* {{{ */
1606 {
1607 int status;
1608 int socktype;
1610 socklen_t socklen = sizeof (socklen_t);
1611 int so_keepalive = 1;
1613 status = getsockopt (sockfd, SOL_SOCKET, SO_TYPE, &socktype, &socklen);
1614 if (status != 0)
1615 {
1616 WARNING ("set_sock_opts: failed to determine socket type");
1617 return;
1618 }
1620 if (socktype == SOCK_STREAM)
1621 {
1622 status = setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE,
1623 &so_keepalive, sizeof (so_keepalive));
1624 if (status != 0)
1625 WARNING ("set_sock_opts: failed to set socket keepalive flag");
1627 #ifdef TCP_KEEPIDLE
1628 int tcp_keepidle = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 100 + 1);
1629 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE,
1630 &tcp_keepidle, sizeof (tcp_keepidle));
1631 if (status != 0)
1632 WARNING ("set_sock_opts: failed to set socket tcp keepalive time");
1633 #endif
1635 #ifdef TCP_KEEPINTVL
1636 int tcp_keepintvl = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 1000 + 1);
1637 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL,
1638 &tcp_keepintvl, sizeof (tcp_keepintvl));
1639 if (status != 0)
1640 WARNING ("set_sock_opts: failed to set socket tcp keepalive interval");
1641 #endif
1642 }
1643 } /* }}} void set_sock_opts */
1645 int strtoderive (const char *string, derive_t *ret_value) /* {{{ */
1646 {
1647 derive_t tmp;
1648 char *endptr;
1650 if ((string == NULL) || (ret_value == NULL))
1651 return (EINVAL);
1653 errno = 0;
1654 endptr = NULL;
1655 tmp = (derive_t) strtoll (string, &endptr, /* base = */ 0);
1656 if ((endptr == string) || (errno != 0))
1657 return (-1);
1659 *ret_value = tmp;
1660 return (0);
1661 } /* }}} int strtoderive */
1663 int strtogauge (const char *string, gauge_t *ret_value) /* {{{ */
1664 {
1665 gauge_t tmp;
1666 char *endptr = NULL;
1668 if ((string == NULL) || (ret_value == NULL))
1669 return (EINVAL);
1671 errno = 0;
1672 endptr = NULL;
1673 tmp = (gauge_t) strtod (string, &endptr);
1674 if (errno != 0)
1675 return (errno);
1676 else if ((endptr == NULL) || (*endptr != 0))
1677 return (EINVAL);
1679 *ret_value = tmp;
1680 return (0);
1681 } /* }}} int strtogauge */
1683 int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str) /* {{{ */
1684 {
1685 char **array;
1686 size_t array_len = *ret_array_len;
1688 if (str == NULL)
1689 return (EINVAL);
1691 array = realloc (*ret_array,
1692 (array_len + 1) * sizeof (*array));
1693 if (array == NULL)
1694 return (ENOMEM);
1695 *ret_array = array;
1697 array[array_len] = strdup (str);
1698 if (array[array_len] == NULL)
1699 return (ENOMEM);
1701 array_len++;
1702 *ret_array_len = array_len;
1703 return (0);
1704 } /* }}} int strarray_add */
1706 void strarray_free (char **array, size_t array_len) /* {{{ */
1707 {
1708 for (size_t i = 0; i < array_len; i++)
1709 sfree (array[i]);
1710 sfree (array);
1711 } /* }}} void strarray_free */
1713 #ifdef HAVE_SYS_CAPABILITY_H
1714 int check_capability (int capability) /* {{{ */
1715 {
1716 #ifdef _LINUX_CAPABILITY_VERSION_3
1717 cap_user_header_t cap_header = calloc(1, sizeof (*cap_header));
1718 if (cap_header == NULL)
1719 {
1720 ERROR("check_capability: calloc failed");
1721 return (-1);
1722 }
1724 cap_user_data_t cap_data = calloc(1, sizeof (*cap_data));
1725 if (cap_data == NULL)
1726 {
1727 ERROR("check_capability: calloc failed");
1728 sfree(cap_header);
1729 return (-1);
1730 }
1732 cap_header->pid = getpid();
1733 cap_header->version = _LINUX_CAPABILITY_VERSION;
1734 if (capget(cap_header, cap_data) < 0)
1735 {
1736 ERROR("check_capability: capget failed");
1737 sfree(cap_header);
1738 sfree(cap_data);
1739 return (-1);
1740 }
1742 if ((cap_data->effective & (1 << capability)) == 0)
1743 {
1744 sfree(cap_header);
1745 sfree(cap_data);
1746 return (-1);
1747 }
1748 else
1749 {
1750 sfree(cap_header);
1751 sfree(cap_data);
1752 return (0);
1753 }
1754 #else
1755 WARNING ("check_capability: unsupported capability implementation. "
1756 "Some plugin(s) may require elevated privileges to work properly.");
1757 return (0);
1758 #endif /* _LINUX_CAPABILITY_VERSION_3 */
1759 } /* }}} int check_capability */
1760 #endif /* HAVE_SYS_CAPABILITY_H */