2 * collectd - src/common.c
3 * Copyright (C) 2005-2008 Florian octo Forster
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Florian octo Forster <octo at verplant.org>
20 * Niki W. Waibel <niki.waibel@gmx.net>
39 /* for ntohl and htonl */
41 # include <arpa/inet.h>
45 extern kstat_ctl_t *kc;
49 static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
53 static pthread_mutex_t strerror_r_lock = PTHREAD_MUTEX_INITIALIZER;
56 char *sstrncpy (char *dest, const char *src, size_t n)
58 strncpy (dest, src, n);
62 } /* char *sstrncpy */
64 int ssnprintf (char *dest, size_t n, const char *format, ...)
69 va_start (ap, format);
70 ret = vsnprintf (dest, n, format, ap);
77 char *sstrdup (const char *s)
85 /* Do not use `strdup' here, because it's not specified in POSIX. It's
86 * ``only'' an XSI extension. */
88 r = (char *) malloc (sizeof (char) * sz);
91 ERROR ("sstrdup: Out of memory.");
94 memcpy (r, s, sizeof (char) * sz);
99 /* Even though Posix requires "strerror_r" to return an "int",
100 * some systems (e.g. the GNU libc) return a "char *" _and_
101 * ignore the second argument ... -tokkee */
102 char *sstrerror (int errnum, char *buf, size_t buflen)
110 pthread_mutex_lock (&strerror_r_lock);
112 temp = strerror (errnum);
113 sstrncpy (buf, temp, buflen);
115 pthread_mutex_unlock (&strerror_r_lock);
117 /* #endif !HAVE_STRERROR_R */
119 #elif STRERROR_R_CHAR_P
122 temp = strerror_r (errnum, buf, buflen);
125 if ((temp != NULL) && (temp != buf) && (temp[0] != '\0'))
126 sstrncpy (buf, temp, buflen);
128 sstrncpy (buf, "strerror_r did not return "
129 "an error message", buflen);
132 /* #endif STRERROR_R_CHAR_P */
135 if (strerror_r (errnum, buf, buflen) != 0)
137 ssnprintf (buf, buflen, "Error #%i; "
138 "Additionally, strerror_r failed.",
141 #endif /* STRERROR_R_CHAR_P */
144 } /* char *sstrerror */
146 void *smalloc (size_t size)
150 if ((r = malloc (size)) == NULL)
152 ERROR ("Not enough memory.");
157 } /* void *smalloc */
160 void sfree (void **ptr)
172 ssize_t sread (int fd, void *buf, size_t count)
183 status = read (fd, (void *) ptr, nleft);
185 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
193 DEBUG ("Received EOF from fd %i. "
194 "Closing fd and returning error.",
200 assert ((0 > status) || (nleft >= (size_t)status));
202 nleft = nleft - status;
210 ssize_t swrite (int fd, const void *buf, size_t count)
216 ptr = (const char *) buf;
221 status = write (fd, (const void *) ptr, nleft);
223 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
229 nleft = nleft - status;
236 int strsplit (char *string, char **fields, size_t size)
245 while ((fields[i] = strtok_r (ptr, " \t\r\n", &saveptr)) != NULL)
257 int strjoin (char *dst, size_t dst_len,
258 char **fields, size_t fields_num,
265 memset (dst, '\0', dst_len);
272 sep_len = strlen (sep);
274 for (i = 0; i < (int)fields_num; i++)
276 if ((i > 0) && (sep_len > 0))
278 if (dst_len <= sep_len)
281 strncat (dst, sep, dst_len);
285 field_len = strlen (fields[i]);
287 if (dst_len <= field_len)
290 strncat (dst, fields[i], dst_len);
291 dst_len -= field_len;
294 return (strlen (dst));
297 int strsubstitute (char *str, char c_from, char c_to)
316 } /* int strsubstitute */
318 int strunescape (char *buf, size_t buf_len)
322 for (i = 0; (i < buf_len) && (buf[i] != '\0'); ++i)
327 if ((i >= buf_len) || (buf[i + 1] == '\0')) {
328 ERROR ("string unescape: backslash found at end of string.");
332 switch (buf[i + 1]) {
347 memmove (buf + i + 1, buf + i + 2, buf_len - i - 2);
350 } /* int strunescape */
352 int escape_slashes (char *buf, int buf_len)
356 if (strcmp (buf, "/") == 0)
361 strncpy (buf, "root", buf_len);
368 /* Move one to the left */
370 memmove (buf, buf + 1, buf_len - 1);
372 for (i = 0; i < buf_len - 1; i++)
376 else if (buf[i] == '/')
382 } /* int escape_slashes */
384 void replace_special (char *buffer, size_t buffer_size)
388 for (i = 0; i < buffer_size; i++)
392 if ((!isalnum ((int) buffer[i])) && (buffer[i] != '-'))
395 } /* void replace_special */
397 int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
399 struct timeval *larger;
400 struct timeval *smaller;
404 NORMALIZE_TIMEVAL (tv0);
405 NORMALIZE_TIMEVAL (tv1);
407 if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
416 if ((tv0.tv_sec < tv1.tv_sec)
417 || ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
431 delta->tv_sec = larger->tv_sec - smaller->tv_sec;
433 if (smaller->tv_usec <= larger->tv_usec)
434 delta->tv_usec = larger->tv_usec - smaller->tv_usec;
438 delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
442 assert ((delta == NULL)
443 || ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
446 } /* int timeval_cmp */
448 int check_create_dir (const char *file_orig)
459 int last_is_file = 1;
460 int path_is_absolute = 0;
465 * Sanity checks first
467 if (file_orig == NULL)
470 if ((len = strlen (file_orig)) < 1)
472 else if (len >= sizeof (file_copy))
476 * If `file_orig' ends in a slash the last component is a directory,
477 * otherwise it's a file. Act accordingly..
479 if (file_orig[len - 1] == '/')
481 if (file_orig[0] == '/')
482 path_is_absolute = 1;
485 * Create a copy for `strtok_r' to destroy
487 sstrncpy (file_copy, file_orig, sizeof (file_copy));
490 * Break into components. This will eat up several slashes in a row and
491 * remove leading and trailing slashes..
496 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
501 if (fields_num >= 16)
506 * For each component, do..
508 for (i = 0; i < (fields_num - last_is_file); i++)
511 * Do not create directories that start with a dot. This
512 * prevents `../../' attacks and other likely malicious
515 if (fields[i][0] == '.')
517 ERROR ("Cowardly refusing to create a directory that begins with a `.' (dot): `%s'", file_orig);
522 * Join the components together again
525 if (strjoin (dir + path_is_absolute, dir_len - path_is_absolute,
526 fields, i + 1, "/") < 0)
528 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
532 if (stat (dir, &statbuf) == -1)
536 if (mkdir (dir, 0755) == -1)
539 ERROR ("check_create_dir: mkdir (%s): %s", dir,
541 errbuf, sizeof (errbuf)));
548 ERROR ("stat (%s): %s", dir,
549 sstrerror (errno, errbuf,
554 else if (!S_ISDIR (statbuf.st_mode))
556 ERROR ("stat (%s): Not a directory!", dir);
562 } /* check_create_dir */
565 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
572 ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
574 if (*ksp_ptr == NULL)
576 if ((*ksp_ptr = kstat_lookup (kc, module, instance, name)) == NULL)
578 ERROR ("Cound not find kstat %s", ident);
582 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
584 WARNING ("kstat %s has wrong type", ident);
591 assert (*ksp_ptr != NULL);
592 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
595 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
597 WARNING ("kstat %s could not be read", ident);
601 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
603 WARNING ("kstat %s has wrong type", ident);
610 long long get_kstat_value (kstat_t *ksp, char *name)
613 long long retval = -1LL;
616 assert (ksp != NULL);
617 assert (ksp->ks_type == KSTAT_TYPE_NAMED);
621 ERROR ("ERROR: %s:%i: ksp == NULL\n", __FILE__, __LINE__);
624 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
626 ERROR ("ERROR: %s:%i: ksp->ks_type != KSTAT_TYPE_NAMED\n", __FILE__, __LINE__);
631 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
634 if (kn->data_type == KSTAT_DATA_INT32)
635 retval = (long long) kn->value.i32;
636 else if (kn->data_type == KSTAT_DATA_UINT32)
637 retval = (long long) kn->value.ui32;
638 else if (kn->data_type == KSTAT_DATA_INT64)
639 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
640 else if (kn->data_type == KSTAT_DATA_UINT64)
641 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
643 WARNING ("get_kstat_value: Not a numeric value: %s", name);
647 #endif /* HAVE_LIBKSTAT */
649 unsigned long long ntohll (unsigned long long n)
651 #if BYTE_ORDER == BIG_ENDIAN
654 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
656 } /* unsigned long long ntohll */
658 unsigned long long htonll (unsigned long long n)
660 #if BYTE_ORDER == BIG_ENDIAN
663 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
665 } /* unsigned long long htonll */
667 #if FP_LAYOUT_NEED_NOTHING
668 /* Well, we need nothing.. */
669 /* #endif FP_LAYOUT_NEED_NOTHING */
671 #elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
672 # if FP_LAYOUT_NEED_ENDIANFLIP
673 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
674 (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
675 (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
676 (((uint64_t)(A) & 0x000000ff00000000LL) >> 8) | \
677 (((uint64_t)(A) & 0x00000000ff000000LL) << 8) | \
678 (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
679 (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
680 (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
682 # define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
683 (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
686 double ntohd (double d)
697 /* NAN in x86 byte order */
698 if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
699 && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
700 && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
701 && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
710 ret.integer = FP_CONVERT (tmp);
711 return (ret.floating);
715 double htond (double d)
726 ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
727 ret.byte[4] = ret.byte[5] = 0x00;
730 return (ret.floating);
737 tmp = FP_CONVERT (ret.integer);
739 return (ret.floating);
742 #endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
744 int format_name (char *ret, int ret_len,
745 const char *hostname,
746 const char *plugin, const char *plugin_instance,
747 const char *type, const char *type_instance)
751 assert (plugin != NULL);
752 assert (type != NULL);
754 if ((plugin_instance == NULL) || (strlen (plugin_instance) == 0))
756 if ((type_instance == NULL) || (strlen (type_instance) == 0))
757 status = ssnprintf (ret, ret_len, "%s/%s/%s",
758 hostname, plugin, type);
760 status = ssnprintf (ret, ret_len, "%s/%s/%s-%s",
761 hostname, plugin, type,
766 if ((type_instance == NULL) || (strlen (type_instance) == 0))
767 status = ssnprintf (ret, ret_len, "%s/%s-%s/%s",
768 hostname, plugin, plugin_instance,
771 status = ssnprintf (ret, ret_len, "%s/%s-%s/%s-%s",
772 hostname, plugin, plugin_instance,
773 type, type_instance);
776 if ((status < 1) || (status >= ret_len))
779 } /* int format_name */
781 int parse_identifier (char *str, char **ret_host,
782 char **ret_plugin, char **ret_plugin_instance,
783 char **ret_type, char **ret_type_instance)
785 char *hostname = NULL;
787 char *plugin_instance = NULL;
789 char *type_instance = NULL;
792 if (hostname == NULL)
795 plugin = strchr (hostname, '/');
798 *plugin = '\0'; plugin++;
800 type = strchr (plugin, '/');
803 *type = '\0'; type++;
805 plugin_instance = strchr (plugin, '-');
806 if (plugin_instance != NULL)
808 *plugin_instance = '\0';
812 type_instance = strchr (type, '-');
813 if (type_instance != NULL)
815 *type_instance = '\0';
819 *ret_host = hostname;
820 *ret_plugin = plugin;
821 *ret_plugin_instance = plugin_instance;
823 *ret_type_instance = type_instance;
825 } /* int parse_identifier */
827 int parse_value (const char *value, value_t *ret_value, const data_source_t ds)
831 if (DS_TYPE_COUNTER == ds.type)
832 ret_value->counter = (counter_t)strtoll (value, &endptr, 0);
833 else if (DS_TYPE_GAUGE == ds.type)
834 ret_value->gauge = (gauge_t)strtod (value, &endptr);
836 ERROR ("parse_value: Invalid data source \"%s\" "
837 "(type = %i).", ds.name, ds.type);
841 if (value == endptr) {
842 ERROR ("parse_value: Failed to parse string as number: %s.", value);
845 else if ((NULL != endptr) && ('\0' != *endptr))
846 WARNING ("parse_value: Ignoring trailing garbage after number: %s.",
849 } /* int parse_value */
851 int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
861 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
865 if (i >= vl->values_len)
870 if (strcmp ("N", ptr) == 0)
871 vl->time = time (NULL);
873 vl->time = (time_t) atoi (ptr);
877 if ((strcmp ("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
878 vl->values[i].gauge = NAN;
879 else if (0 != parse_value (ptr, &vl->values[i], ds->ds[i]))
884 } /* while (strtok_r) */
886 if ((ptr != NULL) || (i != vl->values_len))
889 } /* int parse_values */
892 int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
893 size_t buflen, struct passwd **pwbufp)
898 memset (pwbuf, '\0', sizeof (struct passwd));
900 pthread_mutex_lock (&getpwnam_r_lock);
904 pw = getpwnam (name);
907 status = (errno != 0) ? errno : ENOENT;
911 #define GETPWNAM_COPY_MEMBER(member) \
912 if (pw->member != NULL) \
914 int len = strlen (pw->member); \
920 sstrncpy (buf, pw->member, buflen); \
921 pwbuf->member = buf; \
923 buflen -= (len + 1); \
925 GETPWNAM_COPY_MEMBER(pw_name);
926 GETPWNAM_COPY_MEMBER(pw_passwd);
927 GETPWNAM_COPY_MEMBER(pw_gecos);
928 GETPWNAM_COPY_MEMBER(pw_dir);
929 GETPWNAM_COPY_MEMBER(pw_shell);
931 pwbuf->pw_uid = pw->pw_uid;
932 pwbuf->pw_gid = pw->pw_gid;
938 pthread_mutex_unlock (&getpwnam_r_lock);
941 } /* int getpwnam_r */
942 #endif /* !HAVE_GETPWNAM_R */
944 int notification_init (notification_t *n, int severity, const char *message,
946 const char *plugin, const char *plugin_instance,
947 const char *type, const char *type_instance)
949 memset (n, '\0', sizeof (notification_t));
951 n->severity = severity;
954 sstrncpy (n->message, message, sizeof (n->message));
956 sstrncpy (n->host, host, sizeof (n->host));
958 sstrncpy (n->plugin, plugin, sizeof (n->plugin));
959 if (plugin_instance != NULL)
960 sstrncpy (n->plugin_instance, plugin_instance,
961 sizeof (n->plugin_instance));
963 sstrncpy (n->type, type, sizeof (n->type));
964 if (type_instance != NULL)
965 sstrncpy (n->type_instance, type_instance,
966 sizeof (n->type_instance));
969 } /* int notification_init */
971 int walk_directory (const char *dir, dirwalk_callback_f callback,
982 if ((dh = opendir (dir)) == NULL)
985 ERROR ("walk_directory: Cannot open '%s': %s", dir,
986 sstrerror (errno, errbuf, sizeof (errbuf)));
990 while ((ent = readdir (dh)) != NULL)
994 if (ent->d_name[0] == '.')
997 status = (*callback) (dir, ent->d_name, user_data);
1006 if ((success == 0) && (failure > 0))
1011 int read_file_contents (const char *filename, char *buf, int bufsize)
1016 if ((fh = fopen (filename, "r")) == NULL)
1019 n = fread(buf, 1, bufsize, fh);
1025 counter_t counter_diff (counter_t old_value, counter_t new_value)
1029 if (old_value > new_value)
1031 if (old_value <= 4294967295U)
1032 diff = (4294967295U - old_value) + new_value;
1034 diff = (18446744073709551615ULL - old_value)
1039 diff = new_value - old_value;
1043 } /* counter_t counter_to_gauge */