validate NTP responses (fixes #3515)

* purge old (not yet processes) NTP responses * validate server responses before updating WLED time * purge receive buffer when package is rejected (avoids mem leak on esp32)
2023-11-20 12:24:34 +01:00
parent 75f6a53269
commit 1e29d9463e
2 changed files with 28 additions and 2 deletions
--- a/wled00/const.h
+++ b/wled00/const.h
@@ -375,7 +375,8 @@
 #define SUBPAGE_JS              254
 #define SUBPAGE_WELCOME         255

-#define NTP_PACKET_SIZE 48
+#define NTP_PACKET_SIZE 48       // size of NTP recive buffer
+#define NTP_MIN_PACKET_SIZE 48   // min expected size - NTP v4 allows for "extended information" appended to the standard fields

 //maximum number of rendered LEDs - this does not have to match max. physical LEDs, e.g. if there are virtual busses
 #ifndef MAX_LEDS