Fix various bugs (Anticheat, Lua helpers) (#8013)

* Fix various bugs (Anticheat, Lua helpers)

Anticheat: Use camera position instead of player position for shoot line calculations
Lua helpers: Increase 'i' to not overwrite earlier added table values

* Remove lag compensation

* * 1.5 for larger selection boxes

5 files changed, 15 insertions, 16 deletions

diff --git a/src/network/serverpackethandler.cpp b/src/network/serverpackethandler.cpp
index 329b38765..138cf3edb 100644
--- a/src/network/serverpackethandler.cpp
+++ b/src/network/serverpackethandler.cpp
@@ -627,7 +627,7 @@ void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 		// Check for out-of-range interaction
 		if (remote->type == InventoryLocation::NODEMETA) {
 			v3f node_pos   = intToFloat(remote->p, BS);
-			v3f player_pos = player->getPlayerSAO()->getBasePosition();
+			v3f player_pos = player->getPlayerSAO()->getEyePosition();
 			f32 d = player_pos.getDistanceFrom(node_pos);
 			if (!checkInteractDistance(player, d, "inventory"))
 				return;
@@ -969,8 +969,9 @@ bool Server::checkInteractDistance(RemotePlayer *player, const f32 d, const std:
 	else if (max_d < 0)
 		max_d = BS * 4.0f;
 
-	// cube diagonal: sqrt(3) = 1.732
-	if (d > max_d * 1.732) {
+	// Cube diagonal * 1.5 for maximal supported node extents:
+	// sqrt(3) * 1.5 ≅ 2.6
+	if (d > max_d + 2.6f * BS) {
 		actionstream << "Player " << player->getName()
 				<< " tried to access " << what
 				<< " from too far: "
@@ -1109,7 +1110,9 @@ void Server::handleCommand_Interact(NetworkPacket* pkt)
 
 	if ((action == 0 || action == 2 || action == 3 || action == 4) &&
 			enable_anticheat && !isSingleplayer()) {
-		float d = player_pos.getDistanceFrom(pointed_pos_under);
+		float d = playersao->getEyePosition()
+			.getDistanceFrom(pointed_pos_under);
+
 		if (!checkInteractDistance(player, d, pointed.dump())) {
 			// Re-send block to revert change on client-side
 			RemoteClient *client = getClient(pkt->getPeerId());
diff --git a/src/script/common/c_content.cpp b/src/script/common/c_content.cpp
index 033549475..7e2f6772f 100644
--- a/src/script/common/c_content.cpp
+++ b/src/script/common/c_content.cpp
@@ -348,7 +348,7 @@ void push_object_properties(lua_State *L, ObjectProperties *prop)
 	u16 i = 1;
 	for (const std::string &texture : prop->textures) {
 		lua_pushlstring(L, texture.c_str(), texture.size());
-		lua_rawseti(L, -2, i);
+		lua_rawseti(L, -2, i++);
 	}
 	lua_setfield(L, -2, "textures");
 
@@ -356,7 +356,7 @@ void push_object_properties(lua_State *L, ObjectProperties *prop)
 	i = 1;
 	for (const video::SColor &color : prop->colors) {
 		push_ARGB8(L, color);
-		lua_rawseti(L, -2, i);
+		lua_rawseti(L, -2, i++);
 	}
 	lua_setfield(L, -2, "colors");
 
@@ -838,7 +838,7 @@ void push_content_features(lua_State *L, const ContentFeatures &c)
 	u16 i = 1;
 	for (const std::string &it : c.connects_to) {
 		lua_pushlstring(L, it.c_str(), it.size());
-		lua_rawseti(L, -2, i);
+		lua_rawseti(L, -2, i++);
 	}
 	lua_setfield(L, -2, "connects_to");
 
@@ -961,7 +961,7 @@ void push_box(lua_State *L, const std::vector<aabb3f> &box)
 	u8 i = 1;
 	for (const aabb3f &it : box) {
 		push_aabb3f(L, it);
-		lua_rawseti(L, -2, i);
+		lua_rawseti(L, -2, i++);
 	}
 }
 
diff --git a/src/script/lua_api/l_mainmenu.cpp b/src/script/lua_api/l_mainmenu.cpp
index f0f56098f..145ff0970 100644
--- a/src/script/lua_api/l_mainmenu.cpp
+++ b/src/script/lua_api/l_mainmenu.cpp
@@ -532,8 +532,7 @@ int ModApiMainMenu::l_get_content_info(lua_State *L)
 		int i = 1;
 		for (const auto &dep : spec.depends) {
 			lua_pushstring(L, dep.c_str());
-			lua_rawseti(L, -2, i);
-			i++;
+			lua_rawseti(L, -2, i++);
 		}
 		lua_setfield(L, -2, "depends");
 
@@ -542,8 +541,7 @@ int ModApiMainMenu::l_get_content_info(lua_State *L)
 		i = 1;
 		for (const auto &dep : spec.optdepends) {
 			lua_pushstring(L, dep.c_str());
-			lua_rawseti(L, -2, i);
-			i++;
+			lua_rawseti(L, -2, i++);
 		}
 		lua_setfield(L, -2, "optional_depends");
 	}
diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index b8e52bd49..92ed4377e 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -1042,8 +1042,7 @@ int ModApiMapgen::l_get_gen_notify(lua_State *L)
 	int i = 1;
 	for (u32 gen_notify_on_deco_id : emerge->gen_notify_on_deco_ids) {
 		lua_pushnumber(L, gen_notify_on_deco_id);
-		lua_rawseti(L, -2, i);
-		i++;
+		lua_rawseti(L, -2, i++);
 	}
 	return 2;
 }
diff --git a/src/script/lua_api/l_object.cpp b/src/script/lua_api/l_object.cpp
index f077d42a0..e673778e9 100644
--- a/src/script/lua_api/l_object.cpp
+++ b/src/script/lua_api/l_object.cpp
@@ -1681,8 +1681,7 @@ int ObjectRef::l_get_sky(lua_State *L)
 	s16 i = 1;
 	for (const std::string &param : params) {
 		lua_pushlstring(L, param.c_str(), param.size());
-		lua_rawseti(L, -2, i);
-		i++;
+		lua_rawseti(L, -2, i++);
 	}
 	lua_pushboolean(L, clouds);
 	return 4;