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util: rework timestamp fuzzing

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Use UTI_GetRandomBytes() instead of random() to generate random bits
below precision. Save the result in NTP_int64 in the network order and
allow precision in the full range from -32 to 32. With precision 32
the fuzzing now makes the timestamp completely random and can be used to
hide the time.
This commit is contained in:
Miroslav Lichvar
2015-11-10 17:26:59 +01:00
parent 6199a89170
commit 116c697282
3 changed files with 37 additions and 27 deletions
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6
util.h
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@@ -96,13 +96,13 @@ extern char *UTI_TimeToLogForm(time_t t);
/* Adjust time following a frequency/offset change */
extern void UTI_AdjustTimeval(struct timeval *old_tv, struct timeval *when, struct timeval *new_tv, double *delta, double dfreq, double doffset);
/* Get a random value to fuzz an NTP timestamp in the given precision */
extern uint32_t UTI_GetNTPTsFuzz(int precision);
/* Get zero NTP timestamp with random bits below precision */
extern void UTI_GetInt64Fuzz(NTP_int64 *ts, int precision);
extern double UTI_Int32ToDouble(NTP_int32 x);
extern NTP_int32 UTI_DoubleToInt32(double x);
extern void UTI_TimevalToInt64(struct timeval *src, NTP_int64 *dest, uint32_t fuzz);
extern void UTI_TimevalToInt64(struct timeval *src, NTP_int64 *dest, NTP_int64 *fuzz);
extern void UTI_Int64ToTimeval(NTP_int64 *src, struct timeval *dest);