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 /* for getaddrinfo */
41 #include <netdb.h>
42 #include <sys/types.h>
44 #include <poll.h>
46 #if HAVE_NETINET_IN_H
47 #include <netinet/in.h>
48 #endif
50 #if HAVE_NETINET_TCP_H
51 #include <netinet/tcp.h>
52 #endif
54 /* for ntohl and htonl */
55 #if HAVE_ARPA_INET_H
56 #include <arpa/inet.h>
57 #endif
59 #if HAVE_CAPABILITY
60 #include <sys/capability.h>
61 #endif
63 #ifdef HAVE_LIBKSTAT
64 extern kstat_ctl_t *kc;
65 #endif
67 /* AIX doesn't have MSG_DONTWAIT */
68 #ifndef MSG_DONTWAIT
69 #define MSG_DONTWAIT MSG_NONBLOCK
70 #endif
72 #if !HAVE_GETPWNAM_R
73 static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
74 #endif
76 #if !HAVE_STRERROR_R
77 static pthread_mutex_t strerror_r_lock = PTHREAD_MUTEX_INITIALIZER;
78 #endif
80 char *sstrncpy(char *dest, const char *src, size_t n) {
81 strncpy(dest, src, n);
82 dest[n - 1] = '\0';
84 return dest;
85 } /* char *sstrncpy */
87 char *ssnprintf_alloc(char const *format, ...) /* {{{ */
88 {
89 char static_buffer[1024] = "";
90 char *alloc_buffer;
91 size_t alloc_buffer_size;
92 int status;
93 va_list ap;
95 /* Try printing into the static buffer. In many cases it will be
96 * sufficiently large and we can simply return a strdup() of this
97 * buffer. */
98 va_start(ap, format);
99 status = vsnprintf(static_buffer, sizeof(static_buffer), format, ap);
100 va_end(ap);
101 if (status < 0)
102 return NULL;
104 /* "status" does not include the null byte. */
105 alloc_buffer_size = (size_t)(status + 1);
106 if (alloc_buffer_size <= sizeof(static_buffer))
107 return strdup(static_buffer);
109 /* Allocate a buffer large enough to hold the string. */
110 alloc_buffer = calloc(1, alloc_buffer_size);
111 if (alloc_buffer == NULL)
112 return NULL;
114 /* Print again into this new buffer. */
115 va_start(ap, format);
116 status = vsnprintf(alloc_buffer, alloc_buffer_size, format, ap);
117 va_end(ap);
118 if (status < 0) {
119 sfree(alloc_buffer);
120 return NULL;
121 }
123 return alloc_buffer;
124 } /* }}} char *ssnprintf_alloc */
126 char *sstrdup(const char *s) {
127 char *r;
128 size_t sz;
130 if (s == NULL)
131 return NULL;
133 /* Do not use `strdup' here, because it's not specified in POSIX. It's
134 * ``only'' an XSI extension. */
135 sz = strlen(s) + 1;
136 r = malloc(sz);
137 if (r == NULL) {
138 ERROR("sstrdup: Out of memory.");
139 exit(3);
140 }
141 memcpy(r, s, sz);
143 return r;
144 } /* char *sstrdup */
146 /* Even though Posix requires "strerror_r" to return an "int",
147 * some systems (e.g. the GNU libc) return a "char *" _and_
148 * ignore the second argument ... -tokkee */
149 char *sstrerror(int errnum, char *buf, size_t buflen) {
150 buf[0] = '\0';
152 #if !HAVE_STRERROR_R
153 {
154 char *temp;
156 pthread_mutex_lock(&strerror_r_lock);
158 temp = strerror(errnum);
159 sstrncpy(buf, temp, buflen);
161 pthread_mutex_unlock(&strerror_r_lock);
162 }
163 /* #endif !HAVE_STRERROR_R */
165 #elif STRERROR_R_CHAR_P
166 {
167 char *temp;
168 temp = strerror_r(errnum, buf, buflen);
169 if (buf[0] == '\0') {
170 if ((temp != NULL) && (temp != buf) && (temp[0] != '\0'))
171 sstrncpy(buf, temp, buflen);
172 else
173 sstrncpy(buf, "strerror_r did not return "
174 "an error message",
175 buflen);
176 }
177 }
178 /* #endif STRERROR_R_CHAR_P */
180 #else
181 if (strerror_r(errnum, buf, buflen) != 0) {
182 snprintf(buf, buflen, "Error #%i; "
183 "Additionally, strerror_r failed.",
184 errnum);
185 }
186 #endif /* STRERROR_R_CHAR_P */
188 return buf;
189 } /* char *sstrerror */
191 void *smalloc(size_t size) {
192 void *r;
194 if ((r = malloc(size)) == NULL) {
195 ERROR("Not enough memory.");
196 exit(3);
197 }
199 return r;
200 } /* void *smalloc */
202 #if 0
203 void sfree (void **ptr)
204 {
205 if (ptr == NULL)
206 return;
208 if (*ptr != NULL)
209 free (*ptr);
211 *ptr = NULL;
212 }
213 #endif
215 int sread(int fd, void *buf, size_t count) {
216 char *ptr;
217 size_t nleft;
218 ssize_t status;
220 ptr = (char *)buf;
221 nleft = count;
223 while (nleft > 0) {
224 status = read(fd, (void *)ptr, nleft);
226 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
227 continue;
229 if (status < 0)
230 return status;
232 if (status == 0) {
233 DEBUG("Received EOF from fd %i. ", fd);
234 return -1;
235 }
237 assert((0 > status) || (nleft >= (size_t)status));
239 nleft = nleft - ((size_t)status);
240 ptr = ptr + ((size_t)status);
241 }
243 return 0;
244 }
246 int swrite(int fd, const void *buf, size_t count) {
247 const char *ptr;
248 size_t nleft;
249 ssize_t status;
250 struct pollfd pfd;
252 ptr = (const char *)buf;
253 nleft = count;
255 if (fd < 0) {
256 errno = EINVAL;
257 return errno;
258 }
260 /* checking for closed peer connection */
261 pfd.fd = fd;
262 pfd.events = POLLIN | POLLHUP;
263 pfd.revents = 0;
264 if (poll(&pfd, 1, 0) > 0) {
265 char buffer[32];
266 if (recv(fd, buffer, sizeof(buffer), MSG_PEEK | MSG_DONTWAIT) == 0) {
267 /* if recv returns zero (even though poll() said there is data to be
268 * read), that means the connection has been closed */
269 errno = ECONNRESET;
270 return -1;
271 }
272 }
274 while (nleft > 0) {
275 status = write(fd, (const void *)ptr, nleft);
277 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
278 continue;
280 if (status < 0)
281 return errno ? errno : status;
283 nleft = nleft - ((size_t)status);
284 ptr = ptr + ((size_t)status);
285 }
287 return 0;
288 }
290 int strsplit(char *string, char **fields, size_t size) {
291 size_t i;
292 char *ptr;
293 char *saveptr;
295 i = 0;
296 ptr = string;
297 saveptr = NULL;
298 while ((fields[i] = strtok_r(ptr, " \t\r\n", &saveptr)) != NULL) {
299 ptr = NULL;
300 i++;
302 if (i >= size)
303 break;
304 }
306 return (int)i;
307 }
309 int strjoin(char *buffer, size_t buffer_size, char **fields, size_t fields_num,
310 const char *sep) {
311 size_t avail = 0;
312 char *ptr = buffer;
313 size_t sep_len = 0;
315 size_t buffer_req = 0;
317 if (((fields_num != 0) && (fields == NULL)) ||
318 ((buffer_size != 0) && (buffer == NULL)))
319 return -EINVAL;
321 if (buffer != NULL)
322 buffer[0] = 0;
324 if (buffer_size != 0)
325 avail = buffer_size - 1;
327 if (sep != NULL)
328 sep_len = strlen(sep);
330 for (size_t i = 0; i < fields_num; i++) {
331 size_t field_len = strlen(fields[i]);
333 if (i != 0)
334 buffer_req += sep_len;
335 buffer_req += field_len;
337 if ((i != 0) && (sep_len > 0)) {
338 if (sep_len >= avail) {
339 /* prevent subsequent iterations from writing to the
340 * buffer. */
341 avail = 0;
342 continue;
343 }
345 memcpy(ptr, sep, sep_len);
347 ptr += sep_len;
348 avail -= sep_len;
349 }
351 if (field_len > avail)
352 field_len = avail;
354 memcpy(ptr, fields[i], field_len);
355 ptr += field_len;
357 avail -= field_len;
358 if (ptr != NULL)
359 *ptr = 0;
360 }
362 return (int)buffer_req;
363 }
365 int escape_string(char *buffer, size_t buffer_size) {
366 char *temp;
367 size_t j;
369 /* Check if we need to escape at all first */
370 temp = strpbrk(buffer, " \t\"\\");
371 if (temp == NULL)
372 return 0;
374 if (buffer_size < 3)
375 return EINVAL;
377 temp = calloc(1, buffer_size);
378 if (temp == NULL)
379 return ENOMEM;
381 temp[0] = '"';
382 j = 1;
384 for (size_t i = 0; i < buffer_size; i++) {
385 if (buffer[i] == 0) {
386 break;
387 } else if ((buffer[i] == '"') || (buffer[i] == '\\')) {
388 if (j > (buffer_size - 4))
389 break;
390 temp[j] = '\\';
391 temp[j + 1] = buffer[i];
392 j += 2;
393 } else {
394 if (j > (buffer_size - 3))
395 break;
396 temp[j] = buffer[i];
397 j++;
398 }
399 }
401 assert((j + 1) < buffer_size);
402 temp[j] = '"';
403 temp[j + 1] = 0;
405 sstrncpy(buffer, temp, buffer_size);
406 sfree(temp);
407 return 0;
408 } /* int escape_string */
410 int strunescape(char *buf, size_t buf_len) {
411 for (size_t i = 0; (i < buf_len) && (buf[i] != '\0'); ++i) {
412 if (buf[i] != '\\')
413 continue;
415 if (((i + 1) >= buf_len) || (buf[i + 1] == 0)) {
416 ERROR("string unescape: backslash found at end of string.");
417 /* Ensure null-byte at the end of the buffer. */
418 buf[i] = 0;
419 return -1;
420 }
422 switch (buf[i + 1]) {
423 case 't':
424 buf[i] = '\t';
425 break;
426 case 'n':
427 buf[i] = '\n';
428 break;
429 case 'r':
430 buf[i] = '\r';
431 break;
432 default:
433 buf[i] = buf[i + 1];
434 break;
435 }
437 /* Move everything after the position one position to the left.
438 * Add a null-byte as last character in the buffer. */
439 memmove(buf + i + 1, buf + i + 2, buf_len - i - 2);
440 buf[buf_len - 1] = 0;
441 }
442 return 0;
443 } /* int strunescape */
445 size_t strstripnewline(char *buffer) {
446 size_t buffer_len = strlen(buffer);
448 while (buffer_len > 0) {
449 if ((buffer[buffer_len - 1] != '\n') && (buffer[buffer_len - 1] != '\r'))
450 break;
451 buffer_len--;
452 buffer[buffer_len] = 0;
453 }
455 return buffer_len;
456 } /* size_t strstripnewline */
458 int escape_slashes(char *buffer, size_t buffer_size) {
459 size_t buffer_len;
461 buffer_len = strlen(buffer);
463 if (buffer_len <= 1) {
464 if (strcmp("/", buffer) == 0) {
465 if (buffer_size < 5)
466 return -1;
467 sstrncpy(buffer, "root", buffer_size);
468 }
469 return 0;
470 }
472 /* Move one to the left */
473 if (buffer[0] == '/') {
474 memmove(buffer, buffer + 1, buffer_len);
475 buffer_len--;
476 }
478 for (size_t i = 0; i < buffer_len; i++) {
479 if (buffer[i] == '/')
480 buffer[i] = '_';
481 }
483 return 0;
484 } /* int escape_slashes */
486 void replace_special(char *buffer, size_t buffer_size) {
487 for (size_t i = 0; i < buffer_size; i++) {
488 if (buffer[i] == 0)
489 return;
490 if ((!isalnum((int)buffer[i])) && (buffer[i] != '-'))
491 buffer[i] = '_';
492 }
493 } /* void replace_special */
495 int timeval_cmp(struct timeval tv0, struct timeval tv1, struct timeval *delta) {
496 struct timeval *larger;
497 struct timeval *smaller;
499 int status;
501 NORMALIZE_TIMEVAL(tv0);
502 NORMALIZE_TIMEVAL(tv1);
504 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec)) {
505 if (delta != NULL) {
506 delta->tv_sec = 0;
507 delta->tv_usec = 0;
508 }
509 return 0;
510 }
512 if ((tv0.tv_sec < tv1.tv_sec) ||
513 ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec))) {
514 larger = &tv1;
515 smaller = &tv0;
516 status = -1;
517 } else {
518 larger = &tv0;
519 smaller = &tv1;
520 status = 1;
521 }
523 if (delta != NULL) {
524 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
526 if (smaller->tv_usec <= larger->tv_usec)
527 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
528 else {
529 --delta->tv_sec;
530 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
531 }
532 }
534 assert((delta == NULL) ||
535 ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
537 return status;
538 } /* int timeval_cmp */
540 int check_create_dir(const char *file_orig) {
541 struct stat statbuf;
543 char file_copy[512];
544 char dir[512];
545 int dir_len = 512;
546 char *fields[16];
547 int fields_num;
548 char *ptr;
549 char *saveptr;
550 int last_is_file = 1;
551 int path_is_absolute = 0;
552 size_t len;
554 /*
555 * Sanity checks first
556 */
557 if (file_orig == NULL)
558 return -1;
560 if ((len = strlen(file_orig)) < 1)
561 return -1;
562 else if (len >= sizeof(file_copy))
563 return -1;
565 /*
566 * If `file_orig' ends in a slash the last component is a directory,
567 * otherwise it's a file. Act accordingly..
568 */
569 if (file_orig[len - 1] == '/')
570 last_is_file = 0;
571 if (file_orig[0] == '/')
572 path_is_absolute = 1;
574 /*
575 * Create a copy for `strtok_r' to destroy
576 */
577 sstrncpy(file_copy, file_orig, sizeof(file_copy));
579 /*
580 * Break into components. This will eat up several slashes in a row and
581 * remove leading and trailing slashes..
582 */
583 ptr = file_copy;
584 saveptr = NULL;
585 fields_num = 0;
586 while ((fields[fields_num] = strtok_r(ptr, "/", &saveptr)) != NULL) {
587 ptr = NULL;
588 fields_num++;
590 if (fields_num >= 16)
591 break;
592 }
594 /*
595 * For each component, do..
596 */
597 for (int i = 0; i < (fields_num - last_is_file); i++) {
598 /*
599 * Do not create directories that start with a dot. This
600 * prevents `../../' attacks and other likely malicious
601 * behavior.
602 */
603 if (fields[i][0] == '.') {
604 ERROR("Cowardly refusing to create a directory that "
605 "begins with a `.' (dot): `%s'",
606 file_orig);
607 return -2;
608 }
610 /*
611 * Join the components together again
612 */
613 dir[0] = '/';
614 if (strjoin(dir + path_is_absolute, (size_t)(dir_len - path_is_absolute),
615 fields, (size_t)(i + 1), "/") < 0) {
616 ERROR("strjoin failed: `%s', component #%i", file_orig, i);
617 return -1;
618 }
620 while (42) {
621 if ((stat(dir, &statbuf) == -1) && (lstat(dir, &statbuf) == -1)) {
622 if (errno == ENOENT) {
623 if (mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0)
624 break;
626 /* this might happen, if a different thread created
627 * the directory in the meantime
628 * => call stat() again to check for S_ISDIR() */
629 if (EEXIST == errno)
630 continue;
632 char errbuf[1024];
633 ERROR("check_create_dir: mkdir (%s): %s", dir,
634 sstrerror(errno, errbuf, sizeof(errbuf)));
635 return -1;
636 } else {
637 char errbuf[1024];
638 ERROR("check_create_dir: stat (%s): %s", dir,
639 sstrerror(errno, errbuf, sizeof(errbuf)));
640 return -1;
641 }
642 } else if (!S_ISDIR(statbuf.st_mode)) {
643 ERROR("check_create_dir: `%s' exists but is not "
644 "a directory!",
645 dir);
646 return -1;
647 }
648 break;
649 }
650 }
652 return 0;
653 } /* check_create_dir */
655 #ifdef HAVE_LIBKSTAT
656 int get_kstat(kstat_t **ksp_ptr, char *module, int instance, char *name) {
657 char ident[128];
659 *ksp_ptr = NULL;
661 if (kc == NULL)
662 return -1;
664 snprintf(ident, sizeof(ident), "%s,%i,%s", module, instance, name);
666 *ksp_ptr = kstat_lookup(kc, module, instance, name);
667 if (*ksp_ptr == NULL) {
668 ERROR("get_kstat: Cound not find kstat %s", ident);
669 return -1;
670 }
672 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED) {
673 ERROR("get_kstat: kstat %s has wrong type", ident);
674 *ksp_ptr = NULL;
675 return -1;
676 }
678 #ifdef assert
679 assert(*ksp_ptr != NULL);
680 assert((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
681 #endif
683 if (kstat_read(kc, *ksp_ptr, NULL) == -1) {
684 ERROR("get_kstat: kstat %s could not be read", ident);
685 return -1;
686 }
688 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED) {
689 ERROR("get_kstat: kstat %s has wrong type", ident);
690 return -1;
691 }
693 return 0;
694 }
696 long long get_kstat_value(kstat_t *ksp, char *name) {
697 kstat_named_t *kn;
698 long long retval = -1LL;
700 if (ksp == NULL) {
701 ERROR("get_kstat_value (\"%s\"): ksp is NULL.", name);
702 return -1LL;
703 } else if (ksp->ks_type != KSTAT_TYPE_NAMED) {
704 ERROR("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
705 "is not KSTAT_TYPE_NAMED (%#x).",
706 name, (unsigned int)ksp->ks_type, (unsigned int)KSTAT_TYPE_NAMED);
707 return -1LL;
708 }
710 if ((kn = (kstat_named_t *)kstat_data_lookup(ksp, name)) == NULL)
711 return -1LL;
713 if (kn->data_type == KSTAT_DATA_INT32)
714 retval = (long long)kn->value.i32;
715 else if (kn->data_type == KSTAT_DATA_UINT32)
716 retval = (long long)kn->value.ui32;
717 else if (kn->data_type == KSTAT_DATA_INT64)
718 retval =
719 (long long)kn->value.i64; /* According to ANSI C99 `long long' must hold
720 at least 64 bits */
721 else if (kn->data_type == KSTAT_DATA_UINT64)
722 retval = (long long)kn->value.ui64; /* XXX: Might overflow! */
723 else
724 WARNING("get_kstat_value: Not a numeric value: %s", name);
726 return retval;
727 }
728 #endif /* HAVE_LIBKSTAT */
730 #ifndef HAVE_HTONLL
731 unsigned long long ntohll(unsigned long long n) {
732 #if BYTE_ORDER == BIG_ENDIAN
733 return n;
734 #else
735 return (((unsigned long long)ntohl(n)) << 32) + ntohl(n >> 32);
736 #endif
737 } /* unsigned long long ntohll */
739 unsigned long long htonll(unsigned long long n) {
740 #if BYTE_ORDER == BIG_ENDIAN
741 return n;
742 #else
743 return (((unsigned long long)htonl(n)) << 32) + htonl(n >> 32);
744 #endif
745 } /* unsigned long long htonll */
746 #endif /* HAVE_HTONLL */
748 #if FP_LAYOUT_NEED_NOTHING
749 /* Well, we need nothing.. */
750 /* #endif FP_LAYOUT_NEED_NOTHING */
752 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
753 #if FP_LAYOUT_NEED_ENDIANFLIP
754 #define FP_CONVERT(A) \
755 ((((uint64_t)(A)&0xff00000000000000LL) >> 56) | \
756 (((uint64_t)(A)&0x00ff000000000000LL) >> 40) | \
757 (((uint64_t)(A)&0x0000ff0000000000LL) >> 24) | \
758 (((uint64_t)(A)&0x000000ff00000000LL) >> 8) | \
759 (((uint64_t)(A)&0x00000000ff000000LL) << 8) | \
760 (((uint64_t)(A)&0x0000000000ff0000LL) << 24) | \
761 (((uint64_t)(A)&0x000000000000ff00LL) << 40) | \
762 (((uint64_t)(A)&0x00000000000000ffLL) << 56))
763 #else
764 #define FP_CONVERT(A) \
765 ((((uint64_t)(A)&0xffffffff00000000LL) >> 32) | \
766 (((uint64_t)(A)&0x00000000ffffffffLL) << 32))
767 #endif
769 double ntohd(double d) {
770 union {
771 uint8_t byte[8];
772 uint64_t integer;
773 double floating;
774 } ret;
776 ret.floating = d;
778 /* NAN in x86 byte order */
779 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00) && (ret.byte[2] == 0x00) &&
780 (ret.byte[3] == 0x00) && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00) &&
781 (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f)) {
782 return NAN;
783 } else {
784 uint64_t tmp;
786 tmp = ret.integer;
787 ret.integer = FP_CONVERT(tmp);
788 return ret.floating;
789 }
790 } /* double ntohd */
792 double htond(double d) {
793 union {
794 uint8_t byte[8];
795 uint64_t integer;
796 double floating;
797 } ret;
799 if (isnan(d)) {
800 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
801 ret.byte[4] = ret.byte[5] = 0x00;
802 ret.byte[6] = 0xf8;
803 ret.byte[7] = 0x7f;
804 return ret.floating;
805 } else {
806 uint64_t tmp;
808 ret.floating = d;
809 tmp = FP_CONVERT(ret.integer);
810 ret.integer = tmp;
811 return ret.floating;
812 }
813 } /* double htond */
814 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
816 int format_name(char *ret, int ret_len, const char *hostname,
817 const char *plugin, const char *plugin_instance,
818 const char *type, const char *type_instance) {
819 char *buffer;
820 size_t buffer_size;
822 buffer = ret;
823 buffer_size = (size_t)ret_len;
825 #define APPEND(str) \
826 do { \
827 size_t l = strlen(str); \
828 if (l >= buffer_size) \
829 return ENOBUFS; \
830 memcpy(buffer, (str), l); \
831 buffer += l; \
832 buffer_size -= l; \
833 } while (0)
835 assert(plugin != NULL);
836 assert(type != NULL);
838 APPEND(hostname);
839 APPEND("/");
840 APPEND(plugin);
841 if ((plugin_instance != NULL) && (plugin_instance[0] != 0)) {
842 APPEND("-");
843 APPEND(plugin_instance);
844 }
845 APPEND("/");
846 APPEND(type);
847 if ((type_instance != NULL) && (type_instance[0] != 0)) {
848 APPEND("-");
849 APPEND(type_instance);
850 }
851 assert(buffer_size > 0);
852 buffer[0] = 0;
854 #undef APPEND
855 return 0;
856 } /* int format_name */
858 int format_values(char *ret, size_t ret_len, /* {{{ */
859 const data_set_t *ds, const value_list_t *vl,
860 _Bool store_rates) {
861 size_t offset = 0;
862 int status;
863 gauge_t *rates = NULL;
865 assert(0 == strcmp(ds->type, vl->type));
867 memset(ret, 0, ret_len);
869 #define BUFFER_ADD(...) \
870 do { \
871 status = snprintf(ret + offset, ret_len - offset, __VA_ARGS__); \
872 if (status < 1) { \
873 sfree(rates); \
874 return -1; \
875 } else if (((size_t)status) >= (ret_len - offset)) { \
876 sfree(rates); \
877 return -1; \
878 } else \
879 offset += ((size_t)status); \
880 } while (0)
882 BUFFER_ADD("%.3f", CDTIME_T_TO_DOUBLE(vl->time));
884 for (size_t i = 0; i < ds->ds_num; i++) {
885 if (ds->ds[i].type == DS_TYPE_GAUGE)
886 BUFFER_ADD(":" GAUGE_FORMAT, vl->values[i].gauge);
887 else if (store_rates) {
888 if (rates == NULL)
889 rates = uc_get_rate(ds, vl);
890 if (rates == NULL) {
891 WARNING("format_values: uc_get_rate failed.");
892 return -1;
893 }
894 BUFFER_ADD(":" GAUGE_FORMAT, rates[i]);
895 } else if (ds->ds[i].type == DS_TYPE_COUNTER)
896 BUFFER_ADD(":%llu", vl->values[i].counter);
897 else if (ds->ds[i].type == DS_TYPE_DERIVE)
898 BUFFER_ADD(":%" PRIi64, vl->values[i].derive);
899 else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
900 BUFFER_ADD(":%" PRIu64, vl->values[i].absolute);
901 else {
902 ERROR("format_values: Unknown data source type: %i", ds->ds[i].type);
903 sfree(rates);
904 return -1;
905 }
906 } /* for ds->ds_num */
908 #undef BUFFER_ADD
910 sfree(rates);
911 return 0;
912 } /* }}} int format_values */
914 int parse_identifier(char *str, char **ret_host, char **ret_plugin,
915 char **ret_plugin_instance, char **ret_type,
916 char **ret_type_instance, char *default_host) {
917 char *hostname = NULL;
918 char *plugin = NULL;
919 char *plugin_instance = NULL;
920 char *type = NULL;
921 char *type_instance = NULL;
923 hostname = str;
924 if (hostname == NULL)
925 return -1;
927 plugin = strchr(hostname, '/');
928 if (plugin == NULL)
929 return -1;
930 *plugin = '\0';
931 plugin++;
933 type = strchr(plugin, '/');
934 if (type == NULL) {
935 if (default_host == NULL)
936 return -1;
937 /* else: no host specified; use default */
938 type = plugin;
939 plugin = hostname;
940 hostname = default_host;
941 } else {
942 *type = '\0';
943 type++;
944 }
946 plugin_instance = strchr(plugin, '-');
947 if (plugin_instance != NULL) {
948 *plugin_instance = '\0';
949 plugin_instance++;
950 }
952 type_instance = strchr(type, '-');
953 if (type_instance != NULL) {
954 *type_instance = '\0';
955 type_instance++;
956 }
958 *ret_host = hostname;
959 *ret_plugin = plugin;
960 *ret_plugin_instance = plugin_instance;
961 *ret_type = type;
962 *ret_type_instance = type_instance;
963 return 0;
964 } /* int parse_identifier */
966 int parse_identifier_vl(const char *str, value_list_t *vl) /* {{{ */
967 {
968 char str_copy[6 * DATA_MAX_NAME_LEN];
969 char *host = NULL;
970 char *plugin = NULL;
971 char *plugin_instance = NULL;
972 char *type = NULL;
973 char *type_instance = NULL;
974 int status;
976 if ((str == NULL) || (vl == NULL))
977 return EINVAL;
979 sstrncpy(str_copy, str, sizeof(str_copy));
981 status = parse_identifier(str_copy, &host, &plugin, &plugin_instance, &type,
982 &type_instance,
983 /* default_host = */ NULL);
984 if (status != 0)
985 return status;
987 sstrncpy(vl->host, host, sizeof(vl->host));
988 sstrncpy(vl->plugin, plugin, sizeof(vl->plugin));
989 sstrncpy(vl->plugin_instance,
990 (plugin_instance != NULL) ? plugin_instance : "",
991 sizeof(vl->plugin_instance));
992 sstrncpy(vl->type, type, sizeof(vl->type));
993 sstrncpy(vl->type_instance, (type_instance != NULL) ? type_instance : "",
994 sizeof(vl->type_instance));
996 return 0;
997 } /* }}} int parse_identifier_vl */
999 int parse_value(const char *value_orig, value_t *ret_value, int ds_type) {
1000 char *value;
1001 char *endptr = NULL;
1002 size_t value_len;
1004 if (value_orig == NULL)
1005 return EINVAL;
1007 value = strdup(value_orig);
1008 if (value == NULL)
1009 return ENOMEM;
1010 value_len = strlen(value);
1012 while ((value_len > 0) && isspace((int)value[value_len - 1])) {
1013 value[value_len - 1] = 0;
1014 value_len--;
1015 }
1017 switch (ds_type) {
1018 case DS_TYPE_COUNTER:
1019 ret_value->counter = (counter_t)strtoull(value, &endptr, 0);
1020 break;
1022 case DS_TYPE_GAUGE:
1023 ret_value->gauge = (gauge_t)strtod(value, &endptr);
1024 break;
1026 case DS_TYPE_DERIVE:
1027 ret_value->derive = (derive_t)strtoll(value, &endptr, 0);
1028 break;
1030 case DS_TYPE_ABSOLUTE:
1031 ret_value->absolute = (absolute_t)strtoull(value, &endptr, 0);
1032 break;
1034 default:
1035 sfree(value);
1036 ERROR("parse_value: Invalid data source type: %i.", ds_type);
1037 return -1;
1038 }
1040 if (value == endptr) {
1041 ERROR("parse_value: Failed to parse string as %s: \"%s\".",
1042 DS_TYPE_TO_STRING(ds_type), value);
1043 sfree(value);
1044 return -1;
1045 } else if ((NULL != endptr) && ('\0' != *endptr))
1046 INFO("parse_value: Ignoring trailing garbage \"%s\" after %s value. "
1047 "Input string was \"%s\".",
1048 endptr, DS_TYPE_TO_STRING(ds_type), value_orig);
1050 sfree(value);
1051 return 0;
1052 } /* int parse_value */
1054 int parse_values(char *buffer, value_list_t *vl, const data_set_t *ds) {
1055 size_t i;
1056 char *dummy;
1057 char *ptr;
1058 char *saveptr;
1060 if ((buffer == NULL) || (vl == NULL) || (ds == NULL))
1061 return EINVAL;
1063 i = 0;
1064 dummy = buffer;
1065 saveptr = NULL;
1066 vl->time = 0;
1067 while ((ptr = strtok_r(dummy, ":", &saveptr)) != NULL) {
1068 dummy = NULL;
1070 if (i >= vl->values_len) {
1071 /* Make sure i is invalid. */
1072 i = 0;
1073 break;
1074 }
1076 if (vl->time == 0) {
1077 if (strcmp("N", ptr) == 0)
1078 vl->time = cdtime();
1079 else {
1080 char *endptr = NULL;
1081 double tmp;
1083 errno = 0;
1084 tmp = strtod(ptr, &endptr);
1085 if ((errno != 0) /* Overflow */
1086 || (endptr == ptr) /* Invalid string */
1087 || (endptr == NULL) /* This should not happen */
1088 || (*endptr != 0)) /* Trailing chars */
1089 return -1;
1091 vl->time = DOUBLE_TO_CDTIME_T(tmp);
1092 }
1094 continue;
1095 }
1097 if ((strcmp("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
1098 vl->values[i].gauge = NAN;
1099 else if (0 != parse_value(ptr, &vl->values[i], ds->ds[i].type))
1100 return -1;
1102 i++;
1103 } /* while (strtok_r) */
1105 if ((ptr != NULL) || (i == 0))
1106 return -1;
1107 return 0;
1108 } /* int parse_values */
1110 int parse_value_file(char const *path, value_t *ret_value, int ds_type) {
1111 FILE *fh;
1112 char buffer[256];
1114 fh = fopen(path, "r");
1115 if (fh == NULL)
1116 return -1;
1118 if (fgets(buffer, sizeof(buffer), fh) == NULL) {
1119 fclose(fh);
1120 return -1;
1121 }
1123 fclose(fh);
1125 strstripnewline(buffer);
1127 return parse_value(buffer, ret_value, ds_type);
1128 } /* int parse_value_file */
1130 #if !HAVE_GETPWNAM_R
1131 int getpwnam_r(const char *name, struct passwd *pwbuf, char *buf, size_t buflen,
1132 struct passwd **pwbufp) {
1133 int status = 0;
1134 struct passwd *pw;
1136 memset(pwbuf, '\0', sizeof(struct passwd));
1138 pthread_mutex_lock(&getpwnam_r_lock);
1140 do {
1141 pw = getpwnam(name);
1142 if (pw == NULL) {
1143 status = (errno != 0) ? errno : ENOENT;
1144 break;
1145 }
1147 #define GETPWNAM_COPY_MEMBER(member) \
1148 if (pw->member != NULL) { \
1149 int len = strlen(pw->member); \
1150 if (len >= buflen) { \
1151 status = ENOMEM; \
1152 break; \
1153 } \
1154 sstrncpy(buf, pw->member, buflen); \
1155 pwbuf->member = buf; \
1156 buf += (len + 1); \
1157 buflen -= (len + 1); \
1158 }
1159 GETPWNAM_COPY_MEMBER(pw_name);
1160 GETPWNAM_COPY_MEMBER(pw_passwd);
1161 GETPWNAM_COPY_MEMBER(pw_gecos);
1162 GETPWNAM_COPY_MEMBER(pw_dir);
1163 GETPWNAM_COPY_MEMBER(pw_shell);
1165 pwbuf->pw_uid = pw->pw_uid;
1166 pwbuf->pw_gid = pw->pw_gid;
1168 if (pwbufp != NULL)
1169 *pwbufp = pwbuf;
1170 } while (0);
1172 pthread_mutex_unlock(&getpwnam_r_lock);
1174 return status;
1175 } /* int getpwnam_r */
1176 #endif /* !HAVE_GETPWNAM_R */
1178 int notification_init(notification_t *n, int severity, const char *message,
1179 const char *host, const char *plugin,
1180 const char *plugin_instance, const char *type,
1181 const char *type_instance) {
1182 memset(n, '\0', sizeof(notification_t));
1184 n->severity = severity;
1186 if (message != NULL)
1187 sstrncpy(n->message, message, sizeof(n->message));
1188 if (host != NULL)
1189 sstrncpy(n->host, host, sizeof(n->host));
1190 if (plugin != NULL)
1191 sstrncpy(n->plugin, plugin, sizeof(n->plugin));
1192 if (plugin_instance != NULL)
1193 sstrncpy(n->plugin_instance, plugin_instance, sizeof(n->plugin_instance));
1194 if (type != NULL)
1195 sstrncpy(n->type, type, sizeof(n->type));
1196 if (type_instance != NULL)
1197 sstrncpy(n->type_instance, type_instance, sizeof(n->type_instance));
1199 return 0;
1200 } /* int notification_init */
1202 int walk_directory(const char *dir, dirwalk_callback_f callback,
1203 void *user_data, int include_hidden) {
1204 struct dirent *ent;
1205 DIR *dh;
1206 int success;
1207 int failure;
1209 success = 0;
1210 failure = 0;
1212 if ((dh = opendir(dir)) == NULL) {
1213 char errbuf[1024];
1214 ERROR("walk_directory: Cannot open '%s': %s", dir,
1215 sstrerror(errno, errbuf, sizeof(errbuf)));
1216 return -1;
1217 }
1219 while ((ent = readdir(dh)) != NULL) {
1220 int status;
1222 if (include_hidden) {
1223 if ((strcmp(".", ent->d_name) == 0) || (strcmp("..", ent->d_name) == 0))
1224 continue;
1225 } else /* if (!include_hidden) */
1226 {
1227 if (ent->d_name[0] == '.')
1228 continue;
1229 }
1231 status = (*callback)(dir, ent->d_name, user_data);
1232 if (status != 0)
1233 failure++;
1234 else
1235 success++;
1236 }
1238 closedir(dh);
1240 if ((success == 0) && (failure > 0))
1241 return -1;
1242 return 0;
1243 }
1245 ssize_t read_file_contents(const char *filename, char *buf, size_t bufsize) {
1246 FILE *fh;
1247 ssize_t ret;
1249 fh = fopen(filename, "r");
1250 if (fh == NULL)
1251 return -1;
1253 ret = (ssize_t)fread(buf, 1, bufsize, fh);
1254 if ((ret == 0) && (ferror(fh) != 0)) {
1255 ERROR("read_file_contents: Reading file \"%s\" failed.", filename);
1256 ret = -1;
1257 }
1259 fclose(fh);
1260 return ret;
1261 }
1263 counter_t counter_diff(counter_t old_value, counter_t new_value) {
1264 counter_t diff;
1266 if (old_value > new_value) {
1267 if (old_value <= 4294967295U)
1268 diff = (4294967295U - old_value) + new_value + 1;
1269 else
1270 diff = (18446744073709551615ULL - old_value) + new_value + 1;
1271 } else {
1272 diff = new_value - old_value;
1273 }
1275 return diff;
1276 } /* counter_t counter_diff */
1278 int rate_to_value(value_t *ret_value, gauge_t rate, /* {{{ */
1279 rate_to_value_state_t *state, int ds_type, cdtime_t t) {
1280 gauge_t delta_gauge;
1281 cdtime_t delta_t;
1283 if (ds_type == DS_TYPE_GAUGE) {
1284 state->last_value.gauge = rate;
1285 state->last_time = t;
1287 *ret_value = state->last_value;
1288 return 0;
1289 }
1291 /* Counter and absolute can't handle negative rates. Reset "last time"
1292 * to zero, so that the next valid rate will re-initialize the
1293 * structure. */
1294 if ((rate < 0.0) &&
1295 ((ds_type == DS_TYPE_COUNTER) || (ds_type == DS_TYPE_ABSOLUTE))) {
1296 memset(state, 0, sizeof(*state));
1297 return EINVAL;
1298 }
1300 /* Another invalid state: The time is not increasing. */
1301 if (t <= state->last_time) {
1302 memset(state, 0, sizeof(*state));
1303 return EINVAL;
1304 }
1306 delta_t = t - state->last_time;
1307 delta_gauge = (rate * CDTIME_T_TO_DOUBLE(delta_t)) + state->residual;
1309 /* Previous value is invalid. */
1310 if (state->last_time == 0) /* {{{ */
1311 {
1312 if (ds_type == DS_TYPE_DERIVE) {
1313 state->last_value.derive = (derive_t)rate;
1314 state->residual = rate - ((gauge_t)state->last_value.derive);
1315 } else if (ds_type == DS_TYPE_COUNTER) {
1316 state->last_value.counter = (counter_t)rate;
1317 state->residual = rate - ((gauge_t)state->last_value.counter);
1318 } else if (ds_type == DS_TYPE_ABSOLUTE) {
1319 state->last_value.absolute = (absolute_t)rate;
1320 state->residual = rate - ((gauge_t)state->last_value.absolute);
1321 } else {
1322 assert(23 == 42);
1323 }
1325 state->last_time = t;
1326 return EAGAIN;
1327 } /* }}} */
1329 if (ds_type == DS_TYPE_DERIVE) {
1330 derive_t delta_derive = (derive_t)delta_gauge;
1332 state->last_value.derive += delta_derive;
1333 state->residual = delta_gauge - ((gauge_t)delta_derive);
1334 } else if (ds_type == DS_TYPE_COUNTER) {
1335 counter_t delta_counter = (counter_t)delta_gauge;
1337 state->last_value.counter += delta_counter;
1338 state->residual = delta_gauge - ((gauge_t)delta_counter);
1339 } else if (ds_type == DS_TYPE_ABSOLUTE) {
1340 absolute_t delta_absolute = (absolute_t)delta_gauge;
1342 state->last_value.absolute = delta_absolute;
1343 state->residual = delta_gauge - ((gauge_t)delta_absolute);
1344 } else {
1345 assert(23 == 42);
1346 }
1348 state->last_time = t;
1349 *ret_value = state->last_value;
1350 return 0;
1351 } /* }}} value_t rate_to_value */
1353 int value_to_rate(gauge_t *ret_rate, /* {{{ */
1354 value_t value, int ds_type, cdtime_t t,
1355 value_to_rate_state_t *state) {
1356 gauge_t interval;
1358 /* Another invalid state: The time is not increasing. */
1359 if (t <= state->last_time) {
1360 memset(state, 0, sizeof(*state));
1361 return EINVAL;
1362 }
1364 interval = CDTIME_T_TO_DOUBLE(t - state->last_time);
1366 /* Previous value is invalid. */
1367 if (state->last_time == 0) {
1368 state->last_value = value;
1369 state->last_time = t;
1370 return EAGAIN;
1371 }
1373 switch (ds_type) {
1374 case DS_TYPE_DERIVE: {
1375 derive_t diff = value.derive - state->last_value.derive;
1376 *ret_rate = ((gauge_t)diff) / ((gauge_t)interval);
1377 break;
1378 }
1379 case DS_TYPE_GAUGE: {
1380 *ret_rate = value.gauge;
1381 break;
1382 }
1383 case DS_TYPE_COUNTER: {
1384 counter_t diff = counter_diff(state->last_value.counter, value.counter);
1385 *ret_rate = ((gauge_t)diff) / ((gauge_t)interval);
1386 break;
1387 }
1388 case DS_TYPE_ABSOLUTE: {
1389 absolute_t diff = value.absolute;
1390 *ret_rate = ((gauge_t)diff) / ((gauge_t)interval);
1391 break;
1392 }
1393 default:
1394 return EINVAL;
1395 }
1397 state->last_value = value;
1398 state->last_time = t;
1399 return 0;
1400 } /* }}} value_t rate_to_value */
1402 int service_name_to_port_number(const char *service_name) {
1403 struct addrinfo *ai_list;
1404 int status;
1405 int service_number;
1407 if (service_name == NULL)
1408 return -1;
1410 struct addrinfo ai_hints = {.ai_family = AF_UNSPEC};
1412 status = getaddrinfo(/* node = */ NULL, service_name, &ai_hints, &ai_list);
1413 if (status != 0) {
1414 ERROR("service_name_to_port_number: getaddrinfo failed: %s",
1415 gai_strerror(status));
1416 return -1;
1417 }
1419 service_number = -1;
1420 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL;
1421 ai_ptr = ai_ptr->ai_next) {
1422 if (ai_ptr->ai_family == AF_INET) {
1423 struct sockaddr_in *sa;
1425 sa = (void *)ai_ptr->ai_addr;
1426 service_number = (int)ntohs(sa->sin_port);
1427 } else if (ai_ptr->ai_family == AF_INET6) {
1428 struct sockaddr_in6 *sa;
1430 sa = (void *)ai_ptr->ai_addr;
1431 service_number = (int)ntohs(sa->sin6_port);
1432 }
1434 if ((service_number > 0) && (service_number <= 65535))
1435 break;
1436 }
1438 freeaddrinfo(ai_list);
1440 if ((service_number > 0) && (service_number <= 65535))
1441 return service_number;
1442 return -1;
1443 } /* int service_name_to_port_number */
1445 void set_sock_opts(int sockfd) /* {{{ */
1446 {
1447 int status;
1448 int socktype;
1450 status = getsockopt(sockfd, SOL_SOCKET, SO_TYPE, &socktype,
1451 &(socklen_t){sizeof(socktype)});
1452 if (status != 0) {
1453 WARNING("set_sock_opts: failed to determine socket type");
1454 return;
1455 }
1457 if (socktype == SOCK_STREAM) {
1458 status =
1459 setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &(int){1}, sizeof(int));
1460 if (status != 0)
1461 WARNING("set_sock_opts: failed to set socket keepalive flag");
1463 #ifdef TCP_KEEPIDLE
1464 int tcp_keepidle = ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 100 + 1);
1465 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE, &tcp_keepidle,
1466 sizeof(tcp_keepidle));
1467 if (status != 0)
1468 WARNING("set_sock_opts: failed to set socket tcp keepalive time");
1469 #endif
1471 #ifdef TCP_KEEPINTVL
1472 int tcp_keepintvl =
1473 ((CDTIME_T_TO_MS(plugin_get_interval()) - 1) / 1000 + 1);
1474 status = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL, &tcp_keepintvl,
1475 sizeof(tcp_keepintvl));
1476 if (status != 0)
1477 WARNING("set_sock_opts: failed to set socket tcp keepalive interval");
1478 #endif
1479 }
1480 } /* }}} void set_sock_opts */
1482 int strtoderive(const char *string, derive_t *ret_value) /* {{{ */
1483 {
1484 derive_t tmp;
1485 char *endptr;
1487 if ((string == NULL) || (ret_value == NULL))
1488 return EINVAL;
1490 errno = 0;
1491 endptr = NULL;
1492 tmp = (derive_t)strtoll(string, &endptr, /* base = */ 0);
1493 if ((endptr == string) || (errno != 0))
1494 return -1;
1496 *ret_value = tmp;
1497 return 0;
1498 } /* }}} int strtoderive */
1500 int strtogauge(const char *string, gauge_t *ret_value) /* {{{ */
1501 {
1502 gauge_t tmp;
1503 char *endptr = NULL;
1505 if ((string == NULL) || (ret_value == NULL))
1506 return EINVAL;
1508 errno = 0;
1509 endptr = NULL;
1510 tmp = (gauge_t)strtod(string, &endptr);
1511 if (errno != 0)
1512 return errno;
1513 else if ((endptr == NULL) || (*endptr != 0))
1514 return EINVAL;
1516 *ret_value = tmp;
1517 return 0;
1518 } /* }}} int strtogauge */
1520 int strarray_add(char ***ret_array, size_t *ret_array_len,
1521 char const *str) /* {{{ */
1522 {
1523 char **array;
1524 size_t array_len = *ret_array_len;
1526 if (str == NULL)
1527 return EINVAL;
1529 array = realloc(*ret_array, (array_len + 1) * sizeof(*array));
1530 if (array == NULL)
1531 return ENOMEM;
1532 *ret_array = array;
1534 array[array_len] = strdup(str);
1535 if (array[array_len] == NULL)
1536 return ENOMEM;
1538 array_len++;
1539 *ret_array_len = array_len;
1540 return 0;
1541 } /* }}} int strarray_add */
1543 void strarray_free(char **array, size_t array_len) /* {{{ */
1544 {
1545 for (size_t i = 0; i < array_len; i++)
1546 sfree(array[i]);
1547 sfree(array);
1548 } /* }}} void strarray_free */
1550 #if HAVE_CAPABILITY
1551 int check_capability(int arg) /* {{{ */
1552 {
1553 cap_value_t cap_value = (cap_value_t)arg;
1554 cap_t cap;
1555 cap_flag_value_t cap_flag_value;
1557 if (!CAP_IS_SUPPORTED(cap_value))
1558 return -1;
1560 if (!(cap = cap_get_proc())) {
1561 ERROR("check_capability: cap_get_proc failed.");
1562 return -1;
1563 }
1565 if (cap_get_flag(cap, cap_value, CAP_EFFECTIVE, &cap_flag_value) < 0) {
1566 ERROR("check_capability: cap_get_flag failed.");
1567 cap_free(cap);
1568 return -1;
1569 }
1570 cap_free(cap);
1572 return cap_flag_value != CAP_SET;
1573 } /* }}} int check_capability */
1574 #else
1575 int check_capability(__attribute__((unused)) int arg) /* {{{ */
1576 {
1577 WARNING("check_capability: unsupported capability implementation. "
1578 "Some plugin(s) may require elevated privileges to work properly.");
1579 return 0;
1580 } /* }}} int check_capability */
1581 #endif /* HAVE_CAPABILITY */