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Fuzz transmit timestamp

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Add random bits below clock precision to the timestamp to make
it less predictable.
This commit is contained in:
Miroslav Lichvar
2012-05-22 17:16:41 +02:00
parent d0acfc2652
commit df6c2a432f
6 changed files with 41 additions and 13 deletions
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7
broadcast.c
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@@ -73,7 +73,7 @@ timeout_handler(void *arbitrary)
int leap;
int are_we_synchronised, our_stratum;
NTP_Leap leap_status;
uint32_t our_ref_id;
uint32_t our_ref_id, ts_fuzz;
struct timeval our_ref_time;
double our_root_delay, our_root_dispersion;
struct timeval local_transmit;
@@ -107,14 +107,15 @@ timeout_handler(void *arbitrary)
message.reference_id = htonl((NTP_int32) our_ref_id);
/* Now fill in timestamps */
UTI_TimevalToInt64(&our_ref_time, &message.reference_ts);
UTI_TimevalToInt64(&our_ref_time, &message.reference_ts, 0);
message.originate_ts.hi = 0UL;
message.originate_ts.lo = 0UL;
message.receive_ts.hi = 0UL;
message.receive_ts.lo = 0UL;
ts_fuzz = UTI_GetNTPTsFuzz(message.precision);
LCL_ReadCookedTime(&local_transmit, NULL);
UTI_TimevalToInt64(&local_transmit, &message.transmit_ts);
UTI_TimevalToInt64(&local_transmit, &message.transmit_ts, ts_fuzz);
NIO_SendNormalPacket(&message, &d->addr);
/* Requeue timeout. Don't care if interval drifts gradually, so just do it