From 869df17ddf3736cc013ce24384b8e71aee392049 Mon Sep 17 00:00:00 2001
From: lhofhansl <larsh@apache.org>
Date: Thu, 6 Jul 2023 09:36:46 -0700
Subject: [PATCH] Server enforcement for fog_distance (#13448) to block
 cheating (#13643)

This enforces the fog_distance (if set) at the server, so that a hacked client could not cheat and retrieve blocks beyond the set distance.
---
 src/clientiface.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/clientiface.cpp b/src/clientiface.cpp
index a45242e1c..45df9684a 100644
--- a/src/clientiface.cpp
+++ b/src/clientiface.cpp
@@ -180,7 +180,12 @@ void RemoteClient::GetNextBlocks (
 	s32 new_nearest_unsent_d = -1;
 
 	// Get view range and camera fov (radians) from the client
+	s16 fog_distance = sao->getPlayer()->getSkyParams().fog_distance;
 	s16 wanted_range = sao->getWantedRange() + 1;
+	if (fog_distance >= 0) {
+		// enforce if limited by mod
+		wanted_range = std::min<unsigned>(wanted_range, std::ceil((float)fog_distance / MAP_BLOCKSIZE));
+	}
 	float camera_fov = sao->getFov();
 
 	/*