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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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4
acquire.c
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@@ -256,6 +256,7 @@ probe_source(SourceRecord *src)
union sockaddr_in46 his_addr;
int sock_fd;
socklen_t addrlen;
uint32_t ts_fuzz;
#if 0
printf("Sending probe to %s sent=%d samples=%d\n", UTI_IPToString(&src->ip_addr), src->n_probes_sent, src->n_samples);
@@ -304,8 +305,9 @@ probe_source(SourceRecord *src)
}
ts_fuzz = UTI_GetNTPTsFuzz(LCL_GetSysPrecisionAsLog());
LCL_ReadCookedTime(&cooked, NULL);
UTI_TimevalToInt64(&cooked, &pkt.transmit_ts);
UTI_TimevalToInt64(&cooked, &pkt.transmit_ts, ts_fuzz);
if (sendto(sock_fd, (void *) &pkt, NTP_NORMAL_PACKET_SIZE,
0,