static void make_packet(ntp_data *data)
{
data->status = NTP_LI_FUDGE << 6;
data->stratum = NTP_STRATUM;
data->reference = data->dispersion = 0.0;
data->version = NTP_VERSION;
data->mode = 1;
data->polling = NTP_POLLING;
data->precision = NTP_PRECISION;
data->receive = data->originate = 0.0;
data->current = data->transmit = zbx_current_time();
}
static void unpack_ntp(ntp_data *data, unsigned char *packet, int length)
{
/* Unpack the essential data from an NTP packet, bypassing struct layout and
endian problems. Note that it ignores fields irrelevant to SNTP. */
int i;
double d;
memset(data, 0, sizeof(ntp_data));
if (0 == length)
return;
assert(length >= (NTP_TRANSMIT + 8));
data->current = zbx_current_time(); /* best to come first */
data->status = (packet[0] >> 6);
data->version = (packet[0] >> 3) & 0x07;
data->mode = packet[0] & 0x07;
data->stratum = packet[1];
data->polling = packet[2];
data->precision = packet[3];
d = 0.0;
for (i = 0; i < 4; i++)
d = 256.0 * d + packet[NTP_DISP_FIELD + i];
data->dispersion = d / 65536.0;
d = 0.0;
for (i = 0; i < 8; i++)
d = 256.0 * d + packet[NTP_REFERENCE + i];
data->reference = d / NTP_SCALE;
d = 0.0;
for (i = 0; i < 8; i++)
d = 256.0 * d + packet[NTP_ORIGINATE + i];
data->originate = d / NTP_SCALE;
d = 0.0;
for (i = 0; i < 8; i++)
d = 256.0 * d + packet[NTP_RECEIVE + i];
data->receive = d / NTP_SCALE;
d = 0.0;
for (i = 0; i < 8; i++)
d = 256.0 * d + packet[NTP_TRANSMIT + i];
data->transmit = d / NTP_SCALE;
}
static void make_packet(ntp_data *data)
{
data->version = NTP_VERSION;
data->mode = NTP_MODE_CLIENT;
data->transmit = zbx_current_time();
}
