230 lines
9.1 KiB
C
230 lines
9.1 KiB
C
/*
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chronyd/chronyc - Programs for keeping computer clocks accurate.
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**********************************************************************
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* Copyright (C) Richard P. Curnow 1997-2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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**********************************************************************
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=======================================================================
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Various utility functions
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*/
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#ifndef GOT_UTIL_H
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#define GOT_UTIL_H
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#include "sysincl.h"
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#include "addressing.h"
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#include "ntp.h"
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#include "candm.h"
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#include "hash.h"
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/* Zero a timespec */
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extern void UTI_ZeroTimespec(struct timespec *ts);
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/* Check if a timespec is zero */
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extern int UTI_IsZeroTimespec(struct timespec *ts);
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/* Convert a timeval into a timespec */
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extern void UTI_TimevalToTimespec(struct timeval *tv, struct timespec *ts);
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/* Convert a timespec into a timeval */
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extern void UTI_TimespecToTimeval(struct timespec *ts, struct timeval *tv);
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/* Convert a timespec into a floating point number of seconds */
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extern double UTI_TimespecToDouble(struct timespec *ts);
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/* Convert a number of seconds expressed in floating point into a
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timespec */
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extern void UTI_DoubleToTimespec(double d, struct timespec *ts);
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/* Normalise a timespec, by adding or subtracting seconds to bring
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its nanosecond field into range */
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extern void UTI_NormaliseTimespec(struct timespec *ts);
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/* Convert a timeval into a floating point number of seconds */
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extern double UTI_TimevalToDouble(struct timeval *tv);
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/* Convert a number of seconds expressed in floating point into a
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timeval */
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extern void UTI_DoubleToTimeval(double a, struct timeval *b);
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/* Normalise a struct timeval, by adding or subtracting seconds to bring
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its microseconds field into range */
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extern void UTI_NormaliseTimeval(struct timeval *x);
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/* Returns -1 if a comes earlier than b, 0 if a is the same time as b,
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and +1 if a comes after b */
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extern int UTI_CompareTimespecs(struct timespec *a, struct timespec *b);
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/* Calculate result = a - b */
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extern void UTI_DiffTimespecs(struct timespec *result, struct timespec *a, struct timespec *b);
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/* Calculate result = a - b and return as a double */
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extern double UTI_DiffTimespecsToDouble(struct timespec *a, struct timespec *b);
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/* Add a double increment to a timespec to get a new one. 'start' is
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the starting time, 'end' is the result that we return. This is
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safe to use if start and end are the same */
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extern void UTI_AddDoubleToTimespec(struct timespec *start, double increment, struct timespec *end);
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/* Calculate the average and difference (as a double) of two timespecs */
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extern void UTI_AverageDiffTimespecs(struct timespec *earlier, struct timespec *later, struct timespec *average, double *diff);
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/* Calculate result = a - b + c */
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extern void UTI_AddDiffToTimespec(struct timespec *a, struct timespec *b, struct timespec *c, struct timespec *result);
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/* Convert a timespec into a temporary string, largely for diagnostic
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display */
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extern char *UTI_TimespecToString(struct timespec *ts);
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/* Convert an NTP timestamp into a temporary string, largely for
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diagnostic display */
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extern char *UTI_Ntp64ToString(NTP_int64 *ts);
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/* Convert ref_id into a temporary string, for diagnostics */
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extern char *UTI_RefidToString(uint32_t ref_id);
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/* Convert an IP address to string, for diagnostics */
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extern char *UTI_IPToString(IPAddr *ip);
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extern int UTI_StringToIP(const char *addr, IPAddr *ip);
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extern int UTI_StringToIdIP(const char *addr, IPAddr *ip);
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extern int UTI_IsIPReal(IPAddr *ip);
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extern uint32_t UTI_IPToRefid(IPAddr *ip);
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extern uint32_t UTI_IPToHash(IPAddr *ip);
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extern void UTI_IPHostToNetwork(IPAddr *src, IPAddr *dest);
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extern void UTI_IPNetworkToHost(IPAddr *src, IPAddr *dest);
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extern int UTI_CompareIPs(IPAddr *a, IPAddr *b, IPAddr *mask);
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extern char *UTI_IPSockAddrToString(IPSockAddr *sa);
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extern char *UTI_TimeToLogForm(time_t t);
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/* Adjust time following a frequency/offset change */
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extern void UTI_AdjustTimespec(struct timespec *old_ts, struct timespec *when, struct timespec *new_ts, double *delta_time, double dfreq, double doffset);
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/* Get zero NTP timestamp with random bits below precision */
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extern void UTI_GetNtp64Fuzz(NTP_int64 *ts, int precision);
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extern double UTI_Ntp32ToDouble(NTP_int32 x);
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extern NTP_int32 UTI_DoubleToNtp32(double x);
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/* Zero an NTP timestamp */
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extern void UTI_ZeroNtp64(NTP_int64 *ts);
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/* Check if an NTP timestamp is zero */
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extern int UTI_IsZeroNtp64(NTP_int64 *ts);
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/* Compare two NTP timestamps. Returns -1 if a is before b, 0 if a is equal to
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b, and 1 if a is after b. */
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extern int UTI_CompareNtp64(NTP_int64 *a, NTP_int64 *b);
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/* Compare an NTP timestamp with up to three other timestamps. Returns 0
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if a is not equal to any of b1, b2, and b3, 1 otherwise. */
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extern int UTI_IsEqualAnyNtp64(NTP_int64 *a, NTP_int64 *b1, NTP_int64 *b2, NTP_int64 *b3);
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/* Convert a timespec into an NTP timestamp */
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extern void UTI_TimespecToNtp64(struct timespec *src, NTP_int64 *dest, NTP_int64 *fuzz);
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/* Convert an NTP timestamp into a timespec */
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extern void UTI_Ntp64ToTimespec(NTP_int64 *src, struct timespec *dest);
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/* Check if time + offset is sane */
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extern int UTI_IsTimeOffsetSane(struct timespec *ts, double offset);
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/* Get 2 raised to power of a signed integer */
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extern double UTI_Log2ToDouble(int l);
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extern void UTI_TimespecNetworkToHost(Timespec *src, struct timespec *dest);
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extern void UTI_TimespecHostToNetwork(struct timespec *src, Timespec *dest);
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extern double UTI_FloatNetworkToHost(Float x);
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extern Float UTI_FloatHostToNetwork(double x);
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/* Set FD_CLOEXEC on descriptor */
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extern int UTI_FdSetCloexec(int fd);
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extern void UTI_SetQuitSignalsHandler(void (*handler)(int), int ignore_sigpipe);
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/* Get directory (as an allocated string) for a path */
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extern char *UTI_PathToDir(const char *path);
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/* Create a directory with a specified mode (umasked) and set its uid/gid.
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Create also any parent directories that don't exist with mode 755 and
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default uid/gid. Returns 1 if created or already exists (even with
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different mode/uid/gid), 0 otherwise. */
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extern int UTI_CreateDirAndParents(const char *path, mode_t mode, uid_t uid, gid_t gid);
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/* Check if a directory is secure. It must not have other than the specified
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permissions and its uid/gid must match the specified values. */
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extern int UTI_CheckDirPermissions(const char *path, mode_t perm, uid_t uid, gid_t gid);
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/* Open a file. The full path of the file is constructed from the basedir
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(may be NULL), '/' (if basedir is not NULL), name, and suffix (may be NULL).
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Created files have specified permissions (umasked). Returns NULL on error.
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The following modes are supported (if the mode is an uppercase character,
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errors are fatal):
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r/R - open an existing file for reading
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w/W - open a new file for writing (remove existing file)
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a/A - open an existing file for appending (create if does not exist) */
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extern FILE *UTI_OpenFile(const char *basedir, const char *name, const char *suffix,
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char mode, mode_t perm);
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/* Rename a temporary file by changing its suffix. The paths are constructed as
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in UTI_OpenFile(). If the renaming fails, the file will be removed. */
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extern int UTI_RenameTempFile(const char *basedir, const char *name,
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const char *old_suffix, const char *new_suffix);
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/* Remove a file. The path is constructed as in UTI_OpenFile(). */
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extern int UTI_RemoveFile(const char *basedir, const char *name, const char *suffix);
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/* Set process user/group IDs and drop supplementary groups */
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extern void UTI_DropRoot(uid_t uid, gid_t gid);
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/* Fill buffer with random bytes from /dev/urandom */
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extern void UTI_GetRandomBytesUrandom(void *buf, unsigned int len);
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/* Fill buffer with random bytes from /dev/urandom or a faster source if it's
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available (e.g. arc4random()), which may not necessarily be suitable for
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generating long-term keys */
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extern void UTI_GetRandomBytes(void *buf, unsigned int len);
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/* Print data in hexadecimal format */
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extern int UTI_BytesToHex(const void *buf, unsigned int buf_len, char *hex, unsigned int hex_len);
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/* Parse a string containing data in hexadecimal format. In-place conversion
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is supported. */
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extern unsigned int UTI_HexToBytes(const char *hex, void *buf, unsigned int len);
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/* Macros to get maximum and minimum of two values */
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#ifdef MAX
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#undef MAX
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#endif
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#define MAX(x, y) ((x) > (y) ? (x) : (y))
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#ifdef MIN
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#undef MIN
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#endif
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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/* Macro to clamp a value between two values */
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#define CLAMP(min, x, max) (MAX((min), MIN((x), (max))))
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#define SQUARE(x) ((x) * (x))
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#endif /* GOT_UTIL_H */
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