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This commit is contained in:
Sergey Lyubka committed 2022-05-26 16:22:44 +01:00
1 parent 2ae341cf5e
commit 7f8d12b9f7
3 files changed
+20 -15
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src/sntp.c
+5 -4
View File
@@ -10,21 +10,22 @@
int64_t mg_sntp_parse(const unsigned char *buf, size_t len) {
int64_t res = -1;
int mode = len > 0 ? buf[0] & 7 : 0;
int version = len > 0 ? (buf[0] >> 3) & 7 : 0;
if (len < 48) {
MG_ERROR(("%s", "corrupt packet"));
} else if ((buf[0] & 0x38) >> 3 != 4) {
MG_ERROR(("%s", "wrong version"));
} else if (mode != 4 && mode != 5) {
MG_ERROR(("%s", "not a server reply"));
} else if (buf[1] == 0) {
MG_ERROR(("%s", "server sent a kiss of death"));
} else {
} else if (version == 4 || version == 3) {
uint32_t *data = (uint32_t *) &buf[40];
unsigned long seconds = mg_ntohl(data[0]) - SNTP_TIME_OFFSET;
unsigned long useconds = mg_ntohl(data[1]);
// MG_DEBUG(("%lu %lu %lu", time(0), seconds, useconds));
res = ((int64_t) seconds) * 1000 + (int64_t) ((useconds / 1000) % 1000);
} else {
MG_ERROR(("unexpected version: %d", version));
}
if (res == -1) mg_hexdump(buf, len);
return res;
}