improve packet error logging and handling

include/globals.h

@@ -38,6 +38,13 @@
 // player counts. For very many players, makes movement look jittery.
 #define SCALE_MOVEMENT_UPDATES_TO_PLAYER_COUNT
 
+// If defined, logs unrecognized packet IDs
+// #define DEV_LOG_UNKNOWN_PACKETS
+// If defined, logs cases when packet length doesn't match parsed byte count
+#define DEV_LOG_LENGTH_DISCREPANCY
+// If defined, log chunk generation events
+#define DEV_LOG_CHUNK_GENERATION
+
 #define STATE_NONE 0
 #define STATE_STATUS 1
 #define STATE_LOGIN 2

include/tools.h

@@ -13,6 +13,7 @@ inline int div_floor (int a, int b) {
   return a % b < 0 ? (a - b) / b : a / b;
 }
 
+extern uint64_t total_bytes_received;
 ssize_t recv_all (int client_fd, void *buf, size_t n, uint8_t require_first);
 ssize_t send_all (int client_fd, const void *buf, ssize_t len);