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>
24 #include "utils_debug.h"
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 DBG ("Not enough memory.");
61 void *smalloc (size_t size)
65 if ((r = malloc (size)) == NULL)
67 DBG("Not enough memory.");
75 void sfree (void **ptr)
87 ssize_t sread (int fd, void *buf, size_t count)
98 status = read (fd, (void *) ptr, nleft);
100 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
108 DBG ("Received EOF from fd %i. "
109 "Closing fd and returning error.",
115 assert (nleft >= status);
117 nleft = nleft - status;
125 ssize_t swrite (int fd, const void *buf, size_t count)
131 ptr = (const char *) buf;
136 status = write (fd, (const void *) ptr, nleft);
138 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
144 nleft = nleft - status;
151 int strsplit (char *string, char **fields, size_t size)
158 while ((fields[i] = strtok (ptr, " \t")) != NULL)
170 int strjoin (char *dst, size_t dst_len,
171 char **fields, size_t fields_num,
178 memset (dst, '\0', dst_len);
185 sep_len = strlen (sep);
187 for (i = 0; i < fields_num; i++)
189 if ((i > 0) && (sep_len > 0))
191 if (dst_len <= sep_len)
194 strncat (dst, sep, dst_len);
198 field_len = strlen (fields[i]);
200 if (dst_len <= field_len)
203 strncat (dst, fields[i], dst_len);
204 dst_len -= field_len;
207 return (strlen (dst));
210 int strsubstitute (char *str, char c_from, char c_to)
231 int escape_slashes (char *buf, int buf_len)
235 if (strcmp (buf, "/") == 0)
240 strncpy (buf, "root", buf_len);
244 /* Move one to the left */
245 memmove (buf, buf + 1, buf_len - 1);
247 for (i = 0; i < buf_len - 1; i++)
251 else if (buf[i] == '/')
259 int timeval_sub_timespec (struct timeval *tv0, struct timeval *tv1, struct timespec *ret)
261 if ((tv0 == NULL) || (tv1 == NULL) || (ret == NULL))
264 if ((tv0->tv_sec < tv1->tv_sec)
265 || ((tv0->tv_sec == tv1->tv_sec) && (tv0->tv_usec < tv1->tv_usec)))
268 ret->tv_sec = tv0->tv_sec - tv1->tv_sec;
269 ret->tv_nsec = 1000 * ((long) (tv0->tv_usec - tv1->tv_usec));
271 if (ret->tv_nsec < 0)
273 assert (ret->tv_sec > 0);
275 ret->tv_nsec += 1000000000;
282 int check_create_dir (const char *file_orig)
292 int last_is_file = 1;
297 * Sanity checks first
299 if (file_orig == NULL)
302 if ((len = strlen (file_orig)) < 1)
308 * If `file_orig' ends in a slash the last component is a directory,
309 * otherwise it's a file. Act accordingly..
311 if (file_orig[len - 1] == '/')
315 * Create a copy for `strtok' to destroy
317 strncpy (file_copy, file_orig, 512);
318 file_copy[511] = '\0';
321 * Break into components. This will eat up several slashes in a row and
322 * remove leading and trailing slashes..
326 while ((fields[fields_num] = strtok (ptr, "/")) != NULL)
331 if (fields_num >= 16)
336 * For each component, do..
338 for (i = 0; i < (fields_num - last_is_file); i++)
341 * Do not create directories that start with a dot. This
342 * prevents `../../' attacks and other likely malicious
345 if (fields[i][0] == '.')
347 syslog (LOG_ERR, "Cowardly refusing to create a directory that begins with a `.' (dot): `%s'", file_orig);
352 * Join the components together again
354 if (strjoin (dir, dir_len, fields, i + 1, "/") < 0)
356 syslog (LOG_ERR, "strjoin failed: `%s', component #%i", file_orig, i);
360 if (stat (dir, &statbuf) == -1)
364 if (mkdir (dir, 0755) == -1)
366 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
372 syslog (LOG_ERR, "stat (%s): %s", dir, strerror (errno));
376 else if (!S_ISDIR (statbuf.st_mode))
378 syslog (LOG_ERR, "stat (%s): Not a directory!", dir);
387 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
394 snprintf (ident, 128, "%s,%i,%s", module, instance, name);
397 if (*ksp_ptr == NULL)
399 if ((*ksp_ptr = kstat_lookup (kc, module, instance, name)) == NULL)
401 syslog (LOG_ERR, "Cound not find kstat %s", ident);
405 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
407 syslog (LOG_WARNING, "kstat %s has wrong type", ident);
414 assert (*ksp_ptr != NULL);
415 assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
418 if (kstat_read (kc, *ksp_ptr, NULL) == -1)
420 syslog (LOG_WARNING, "kstat %s could not be read", ident);
424 if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
426 syslog (LOG_WARNING, "kstat %s has wrong type", ident);
433 long long get_kstat_value (kstat_t *ksp, char *name)
436 long long retval = -1LL;
439 assert (ksp != NULL);
440 assert (ksp->ks_type == KSTAT_TYPE_NAMED);
444 fprintf (stderr, "ERROR: %s:%i: ksp == NULL\n", __FILE__, __LINE__);
447 else if (ksp->ks_type != KSTAT_TYPE_NAMED)
449 fprintf (stderr, "ERROR: %s:%i: ksp->ks_type != KSTAT_TYPE_NAMED\n", __FILE__, __LINE__);
454 if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
457 if (kn->data_type == KSTAT_DATA_INT32)
458 retval = (long long) kn->value.i32;
459 else if (kn->data_type == KSTAT_DATA_UINT32)
460 retval = (long long) kn->value.ui32;
461 else if (kn->data_type == KSTAT_DATA_INT64)
462 retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
463 else if (kn->data_type == KSTAT_DATA_UINT64)
464 retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
466 syslog (LOG_WARNING, "get_kstat_value: Not a numeric value: %s", name);
470 #endif /* HAVE_LIBKSTAT */
472 unsigned long long ntohll (unsigned long long n)
474 #if __BYTE_ORDER == __BIG_ENDIAN
477 return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
481 unsigned long long htonll (unsigned long long n)
483 #if __BYTE_ORDER == __BIG_ENDIAN
486 return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);