2 * collectd - src/common.c
3 * Copyright (C) 2005-2007 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>
30 /* for ntohl and htonl */
32 # include <arpa/inet.h>
36 extern kstat_ctl_t *kc;
39 void sstrncpy (char *d, const char *s, int len)
45 char *sstrdup (const char *s)
52 if((r = strdup (s)) == NULL)
54 DEBUG ("Not enough memory.");
61 /* Don't use the return value of `strerror_r', because the GNU-people got
62 * inventive there.. -octo */
63 char *sstrerror (int errnum, char *buf, size_t buflen)
66 strerror_r (errnum, buf, buflen);
68 } /* char *sstrerror */
70 void *smalloc (size_t size)
74 if ((r = malloc (size)) == NULL)
76 DEBUG("Not enough memory.");
84 void sfree (void **ptr)
96 ssize_t sread (int fd, void *buf, size_t count)
107 status = read (fd, (void *) ptr, nleft);
109 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
117 DEBUG ("Received EOF from fd %i. "
118 "Closing fd and returning error.",
124 assert (nleft >= status);
126 nleft = nleft - status;
134 ssize_t swrite (int fd, const void *buf, size_t count)
140 ptr = (const char *) buf;
145 status = write (fd, (const void *) ptr, nleft);
147 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
153 nleft = nleft - status;
160 int strsplit (char *string, char **fields, size_t size)
169 while ((fields[i] = strtok_r (ptr, " \t", &saveptr)) != NULL)
181 int strjoin (char *dst, size_t dst_len,
182 char **fields, size_t fields_num,
189 memset (dst, '\0', dst_len);
196 sep_len = strlen (sep);
198 for (i = 0; i < fields_num; i++)
200 if ((i > 0) && (sep_len > 0))
202 if (dst_len <= sep_len)
205 strncat (dst, sep, dst_len);
209 field_len = strlen (fields[i]);
211 if (dst_len <= field_len)
214 strncat (dst, fields[i], dst_len);
215 dst_len -= field_len;
218 return (strlen (dst));
221 int strsubstitute (char *str, char c_from, char c_to)
242 int escape_slashes (char *buf, int buf_len)
246 if (strcmp (buf, "/") == 0)
251 strncpy (buf, "root", buf_len);
255 /* Move one to the left */
256 memmove (buf, buf + 1, buf_len - 1);
258 for (i = 0; i < buf_len - 1; i++)
262 else if (buf[i] == '/')
270 int timeval_sub_timespec (struct timeval *tv0, struct timeval *tv1, struct timespec *ret)
272 if ((tv0 == NULL) || (tv1 == NULL) || (ret == NULL))
275 if ((tv0->tv_sec < tv1->tv_sec)
276 || ((tv0->tv_sec == tv1->tv_sec) && (tv0->tv_usec < tv1->tv_usec)))
279 ret->tv_sec = tv0->tv_sec - tv1->tv_sec;
280 ret->tv_nsec = 1000 * ((long) (tv0->tv_usec - tv1->tv_usec));
282 if (ret->tv_nsec < 0)
284 assert (ret->tv_sec > 0);
286 ret->tv_nsec += 1000000000;
293 int check_create_dir (const char *file_orig)
304 int last_is_file = 1;
305 int path_is_absolute = 0;
310 * Sanity checks first
312 if (file_orig == NULL)
315 if ((len = strlen (file_orig)) < 1)
321 * If `file_orig' ends in a slash the last component is a directory,
322 * otherwise it's a file. Act accordingly..
324 if (file_orig[len - 1] == '/')
326 if (file_orig[0] == '/')
327 path_is_absolute = 1;
330 * Create a copy for `strtok_r' to destroy
332 strncpy (file_copy, file_orig, 512);
333 file_copy[511] = '\0';
336 * Break into components. This will eat up several slashes in a row and
337 * remove leading and trailing slashes..
342 while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
347 if (fields_num >= 16)
352 * For each component, do..
354 for (i = 0; i < (fields_num - last_is_file); i++)
357 * Do not create directories that start with a dot. This
358 * prevents `../../' attacks and other likely malicious
361 if (fields[i][0] == '.')
363 ERROR ("Cowardly refusing to create a directory that begins with a `.' (dot): `%s'", file_orig);
368 * Join the components together again
371 if (strjoin (dir + path_is_absolute, dir_len - path_is_absolute,
372 fields, i + 1, "/") < 0)
374 ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
378 if (stat (dir, &statbuf) == -1)
382 if (mkdir (dir, 0755) == -1)
385 ERROR ("mkdir (%s): %s", dir,
387 errbuf, sizeof (errbuf)));
394 ERROR ("stat (%s): %s", dir,
395 sstrerror (errno, errbuf,
400 else if (!S_ISDIR (statbuf.st_mode))
402 ERROR ("stat (%s): Not a directory!", dir);
411 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
418 snprintf (ident, 128, "%s,%i,%s", module, instance, name);
421 if (*ksp_ptr == NULL)
423 if ((*ksp_ptr = kstat_lookup (kc, module, instance, name)) == NULL)
425 ERROR ("Cound not find kstat %s", ident);
429 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
431 WARNING ("kstat %s has wrong type", ident);
438 assert (*ksp_ptr != NULL);
439 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
442 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
444 WARNING ("kstat %s could not be read", ident);
448 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
450 WARNING ("kstat %s has wrong type", ident);
457 long long get_kstat_value (kstat_t *ksp, char *name)
460 long long retval = -1LL;
463 assert (ksp != NULL);
464 assert (ksp->ks_type == KSTAT_TYPE_NAMED);
468 fprintf (stderr, "ERROR: %s:%i: ksp == NULL\n", __FILE__, __LINE__);
471 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
473 fprintf (stderr, "ERROR: %s:%i: ksp->ks_type != KSTAT_TYPE_NAMED\n", __FILE__, __LINE__);
478 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
481 if (kn->data_type == KSTAT_DATA_INT32)
482 retval = (long long) kn->value.i32;
483 else if (kn->data_type == KSTAT_DATA_UINT32)
484 retval = (long long) kn->value.ui32;
485 else if (kn->data_type == KSTAT_DATA_INT64)
486 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
487 else if (kn->data_type == KSTAT_DATA_UINT64)
488 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
490 WARNING ("get_kstat_value: Not a numeric value: %s", name);
494 #endif /* HAVE_LIBKSTAT */
496 unsigned long long ntohll (unsigned long long n)
498 #if __BYTE_ORDER == __BIG_ENDIAN
501 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
503 } /* unsigned long long ntohll */
505 unsigned long long htonll (unsigned long long n)
507 #if __BYTE_ORDER == __BIG_ENDIAN
510 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
512 } /* unsigned long long htonll */
514 int format_name (char *ret, int ret_len,
515 const char *hostname,
516 const char *plugin, const char *plugin_instance,
517 const char *type, const char *type_instance)
521 assert (plugin != NULL);
522 assert (type != NULL);
524 if ((plugin_instance == NULL) || (strlen (plugin_instance) == 0))
526 if ((type_instance == NULL) || (strlen (type_instance) == 0))
527 status = snprintf (ret, ret_len, "%s/%s/%s",
528 hostname, plugin, type);
530 status = snprintf (ret, ret_len, "%s/%s/%s-%s",
531 hostname, plugin, type,
536 if ((type_instance == NULL) || (strlen (type_instance) == 0))
537 status = snprintf (ret, ret_len, "%s/%s-%s/%s",
538 hostname, plugin, plugin_instance,
541 status = snprintf (ret, ret_len, "%s/%s-%s/%s-%s",
542 hostname, plugin, plugin_instance,
543 type, type_instance);
546 if ((status < 1) || (status >= ret_len))
549 } /* int format_name */