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send full ntp data symmetrically from server to client.

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This commit is contained in:
F. Duncanh
2025-02-15 18:19:18 -05:00
parent 496253fa28
commit f63a91c708
3 changed files with 16 additions and 2 deletions
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6
lib/byteutils.c
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@@ -86,6 +86,12 @@ uint32_t byteutils_get_int_be(unsigned char* b, int offset) {
uint64_t byteutils_get_long_be(unsigned char* b, int offset) {
return ntohll(byteutils_get_long(b, offset));
}
/**
* Writes a big endian unsigned 64 bit integer to the buffer at position offset
*/
void byteutils_put_long_be(unsigned char* b, int offset, uint64_t value) {
*((uint64_t*)(b + offset)) = htonll(value);
}
/**
* Reads a float from the buffer at position offset

1
lib/byteutils.h
View File

@@ -28,5 +28,6 @@ float byteutils_get_float(unsigned char* b, int offset);
uint64_t byteutils_get_ntp_timestamp(unsigned char *b, int offset);
void byteutils_put_ntp_timestamp(unsigned char *b, int offset, uint64_t us_since_1970);
void byteutils_put_long_be(unsigned char* b, int offset, uint64_t value);
#endif //AIRPLAYSERVER_BYTEUTILS_H

9
lib/raop_ntp.c
View File

@@ -287,6 +287,7 @@ raop_ntp_thread(void *arg)
raop_ntp_data_t data_sorted[RAOP_NTP_DATA_COUNT];
const unsigned two_pow_n[RAOP_NTP_DATA_COUNT] = {2, 4, 8, 16, 32, 64, 128, 256};
bool logger_debug = (logger_get_level(raop_ntp->logger) >= LOGGER_DEBUG);
uint64_t recv_time = 0, client_ref_time = 0;
while (1) {
MUTEX_LOCK(raop_ntp->run_mutex);
@@ -302,6 +303,10 @@ raop_ntp_thread(void *arg)
// Send request
uint64_t send_time = raop_ntp_get_local_time();
byteutils_put_ntp_timestamp(request, 24, send_time);
if (recv_time) {
byteutils_put_long_be(request, 8, client_ref_time);
byteutils_put_ntp_timestamp(request, 16, recv_time);
}
int send_len = sendto(raop_ntp->tsock, (char *)request, sizeof(request), 0,
(struct sockaddr *) &raop_ntp->remote_saddr, raop_ntp->remote_saddr_len);
if (logger_debug) {
@@ -322,11 +327,13 @@ raop_ntp_thread(void *arg)
ntp_timestamp_to_time(send_time, time, sizeof(time));
logger_log(raop_ntp->logger, LOGGER_DEBUG , "raop_ntp receive timeout (request sent %s)", time);
} else {
recv_time = raop_ntp_get_local_time();
client_ref_time = byteutils_get_long_be(response, 24);
if (!raop_ntp->client_time_received) {
raop_ntp->client_time_received = true;
}
//local time of the server when the NTP response packet returns
int64_t t3 = (int64_t) raop_ntp_get_local_time();
int64_t t3 = (int64_t) recv_time;
// Local time of the server when the NTP request packet leaves the server
int64_t t0 = (int64_t) byteutils_get_ntp_timestamp(response, 8);