diff --git a/share/builtin/client_lua/client_lua.cpp b/share/builtin/client_lua/client_lua.cpp
index fb5097d..4f07786 100644
--- a/share/builtin/client_lua/client_lua.cpp
+++ b/share/builtin/client_lua/client_lua.cpp
@@ -79,8 +79,9 @@ struct Module: public interface::Module
 			std::string file_content((std::istreambuf_iterator<char>(f)),
 					std::istreambuf_iterator<char>());
 
+			const ss_ &public_file_name = module_name+"/"+n.name;
 			client_file::access(m_server, [&](client_file::Interface * i){
-				i->add_file_content(file_name, file_content);
+				i->add_file_content(public_file_name, file_content);
 			});
 		}
 	}
diff --git a/share/client/init.lua b/share/client/init.lua
index 34f0d26..e380a29 100644
--- a/share/client/init.lua
+++ b/share/client/init.lua
@@ -36,3 +36,17 @@ function buildat:send_packet(name, data)
 	__buildat_send_packet(name, data)
 end
 
+function buildat:run_script_file(name)
+	local content = __buildat_get_file_content(name)
+	if not content then
+		return false
+	end
+	log:info("buildat:run_script_file("..name.."): #content="..#content)
+	local script, err = loadstring(content)
+	if not script then
+		log:error("Failed to load script: "+err)
+		return false
+	end
+	script()
+end
+
diff --git a/src/client/app.cpp b/src/client/app.cpp
index 17ca2b0..1d2d8cf 100644
--- a/src/client/app.cpp
+++ b/src/client/app.cpp
@@ -340,9 +340,13 @@ struct CApp: public Polycode::EventHandler, public App
 		CApp *self = (CApp*)lua_touserdata(L, -1);
 		lua_pop(L, 1);
 
-		self->m_state->send_packet(name, data);
-
-		return 0;
+		try{
+			self->m_state->send_packet(name, data);
+			return 0;
+		} catch(std::exception &e){
+			log_w(MODULE, "Exception in send_packet: %s", e.what());
+			return 0;
+		}
 	}
 
 	// get_file_content(name: string)
@@ -356,9 +360,14 @@ struct CApp: public Polycode::EventHandler, public App
 		CApp *self = (CApp*)lua_touserdata(L, -1);
 		lua_pop(L, 1);
 
-		ss_ content = self->m_state->get_file_content(name);
-		lua_pushlstring(L, content.c_str(), content.size());
-		return 1;
+		try{
+			ss_ content = self->m_state->get_file_content(name);
+			lua_pushlstring(L, content.c_str(), content.size());
+			return 1;
+		} catch(std::exception &e){
+			log_w(MODULE, "Exception in get_file_content: %s", e.what());
+			return 0;
+		}
 	}
 };
 
diff --git a/src/client/state.cpp b/src/client/state.cpp
index 5b55efb..e9d442e 100644
--- a/src/client/state.cpp
+++ b/src/client/state.cpp
@@ -25,6 +25,7 @@ struct CState: public State
 	interface::PacketStream m_packet_stream;
 	sp_<app::App> m_app;
 	ss_ m_cache_path;
+	sm_<ss_, ss_> m_file_hashes; // name -> hash
 
 	CState(sp_<app::App> app):
 		m_socket(interface::createTCPSocket()),
@@ -65,8 +66,26 @@ struct CState: public State
 
 	ss_ get_file_content(const ss_ &name)
 	{
-		// TODO
-		return "Rullatortilla";
+		auto it = m_file_hashes.find(name);
+		if(it == m_file_hashes.end())
+			throw Exception(ss_()+"hash of file not found: \""+name+"\"");
+		const ss_ &file_hash = it->second;
+		ss_ file_hash_hex = interface::sha1::hex(file_hash);
+		ss_ path = m_cache_path+"/"+file_hash_hex;
+		std::ifstream f(path);
+		if(!f.good())
+			throw Exception(ss_()+"Could not open file: "+path);
+		std::string file_content((std::istreambuf_iterator<char>(f)),
+				std::istreambuf_iterator<char>());
+		ss_ file_hash2 = interface::sha1::calculate(file_content);
+		if(file_hash != file_hash2){
+			log_e(MODULE, "Opened file differs in hash: \"%s\": "
+					"requested %s, actual %s", cs(name),
+					cs(interface::sha1::hex(file_hash)),
+					cs(interface::sha1::hex(file_hash2)));
+			throw Exception(ss_()+"Invalid file content: "+path);
+		}
+		return file_content;
 	}
 
 	void read_socket()
@@ -113,6 +132,7 @@ struct CState: public State
 				ar(file_name);
 				ar(file_hash);
 			}
+			m_file_hashes[file_name] = file_hash;
 			ss_ file_hash_hex = interface::sha1::hex(file_hash);
 			// Check if we already have this file
 			ss_ path = m_cache_path+"/"+file_hash_hex;
diff --git a/test/testmodules/test1/test1.cpp b/test/testmodules/test1/test1.cpp
index 45a6921..fb118bc 100644
--- a/test/testmodules/test1/test1.cpp
+++ b/test/testmodules/test1/test1.cpp
@@ -82,7 +82,7 @@ struct Module: public interface::Module
 		log_v(MODULE, "on_files_sent(): recipient=%zu", event.recipient);
 		network::access(m_server, [&](network::Interface * inetwork){
 			inetwork->send(event.recipient, "core:run_script",
-					"__buildat_run_script_file(\"test1/init.lua\")");
+					"buildat:run_script_file(\"test1/init.lua\")");
 		});
 	}