Support unencrypted multiplayer games with no password

CMakeLists.txt

@@ -27,15 +27,13 @@ option(BINARY_RELEASE "Enable options for binary release" OFF)
 option(NIGHTLY_BUILD "Enable options for nightly build" OFF)
 option(USE_SDL1 "Use SDL1.2 instead of SDL2" OFF)
 option(NONET "Disable network support" OFF)
+cmake_dependent_option(DISABLE_TCP "Disable TCP multiplayer option" OFF "NOT NONET" ON)
+cmake_dependent_option(DISABLE_ZERO_TIER "Disable ZeroTier multiplayer option" OFF "NOT NONET" ON)
+cmake_dependent_option(PACKET_ENCRYPTION "Encrypt network packets" ON "NOT NONET" OFF)
 option(NOSOUND "Disable sound support" OFF)
 option(RUN_TESTS "Build and run tests" OFF)
 option(ENABLE_CODECOVERAGE "Instrument code for code coverage (only enabled with RUN_TESTS)" OFF)
 
-if(NOT NONET)
-  option(DISABLE_TCP "Disable TCP multiplayer option" OFF)
-  option(DISABLE_ZERO_TIER "Disable ZeroTier multiplayer option" OFF)
-endif()
-
 option(DISABLE_STREAMING_MUSIC "Disable streaming music (to work around broken platform implementations)" OFF)
 mark_as_advanced(DISABLE_STREAMING_MUSIC)
 option(DISABLE_STREAMING_SOUNDS "Disable streaming sounds (to work around broken platform implementations)" OFF)
@@ -65,6 +63,9 @@ if(NIGHTLY_BUILD OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
   set(CPACK ON)
 endif()
 
+if(PACKET_ENCRYPTION)
+  list(APPEND VCPKG_MANIFEST_FEATURES "encryption")
+endif()
 if(USE_GETTEXT_FROM_VCPKG)
   list(APPEND VCPKG_MANIFEST_FEATURES "translations")
 endif()
@@ -78,7 +79,7 @@ if(NOT NOSOUND)
                         "DEVILUTIONX_SYSTEM_SDL_AUDIOLIB AND NOT DIST" ON)
 endif()
 
-if(NOT NONET)
+if(PACKET_ENCRYPTION)
   option(DEVILUTIONX_SYSTEM_LIBSODIUM "Use system-provided libsodium" ON)
   cmake_dependent_option(DEVILUTIONX_STATIC_LIBSODIUM "Link static libsodium" OFF
                         "DEVILUTIONX_SYSTEM_LIBSODIUM AND NOT DIST" ON)
@@ -216,6 +217,13 @@ if(PIE)
   set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
 endif()
 
+if(NONET)
+  # Fix dependent options if platform defs disable network
+  set(DISABLE_TCP ON)
+  set(DISABLE_ZERO_TIER ON)
+  set(PACKET_ENCRYPTION OFF)
+endif()
+
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -227,7 +235,7 @@ if(NOT NINTENDO_3DS)
   find_package(Threads REQUIRED)
 endif()
 
-if(NOT NONET)
+if(PACKET_ENCRYPTION)
   if(DEVILUTIONX_SYSTEM_LIBSODIUM)
     set(sodium_USE_STATIC_LIBS ${DEVILUTIONX_STATIC_LIBSODIUM})
     find_package(sodium REQUIRED)
@@ -531,18 +539,26 @@ if(NINTENDO_SWITCH)
     Source/platform/switch/network.cpp
     Source/platform/switch/keyboard.cpp
     Source/platform/switch/docking.cpp
-    Source/platform/switch/random.cpp
     Source/platform/switch/asio/pause.c
     Source/platform/switch/asio/net/if.c
     Source/platform/switch/asio/sys/signal.c)
+
+  if(PACKET_ENCRYPTION)
+    list(APPEND libdevilutionx_SRCS
+      Source/platform/switch/random.cpp)
+  endif()
 endif()
 
 if(VITA)
   list(APPEND libdevilutionx_SRCS
-    Source/platform/vita/random.cpp
     Source/platform/vita/network.cpp
     Source/platform/vita/keyboard.cpp
     Source/platform/vita/touch.cpp)
+
+  if(PACKET_ENCRYPTION)
+    list(APPEND libdevilutionx_SRCS
+      Source/platform/vita/random.cpp)
+  endif()
 endif()
 
 if(NINTENDO_3DS)
@@ -551,13 +567,17 @@ if(NINTENDO_3DS)
     Source/platform/ctr/keyboard.cpp
     Source/platform/ctr/display.cpp
     Source/platform/ctr/messagebox.cpp
-    Source/platform/ctr/random.cpp
     Source/platform/ctr/sockets.cpp
     Source/platform/ctr/locale.cpp
     Source/platform/ctr/asio/net/if.c
     Source/platform/ctr/asio/sys/socket.c
     Source/platform/ctr/asio/sys/uio.c)
   set(BIN_TARGET ${BIN_TARGET}.elf)
+
+  if(PACKET_ENCRYPTION)
+    list(APPEND libdevilutionx_SRCS
+      Source/platform/ctr/random.cpp)
+  endif()
 endif()
 
 if(RUN_TESTS)
@@ -847,7 +867,9 @@ if(NOT NONET)
   if(NOT DISABLE_TCP)
     target_link_libraries(libdevilutionx PUBLIC asio)
   endif()
-  target_link_libraries(libdevilutionx PUBLIC sodium)
+  if(PACKET_ENCRYPTION)
+    target_link_libraries(libdevilutionx PUBLIC sodium)
+  endif()
 endif()
 
 target_link_libraries(libdevilutionx PUBLIC fmt::fmt)
@@ -874,6 +896,7 @@ foreach(
   GPERF_HEAP_MAIN
   GPERF_HEAP_FIRST_GAME_ITERATION
   STREAM_ALL_AUDIO
+  PACKET_ENCRYPTION
   VIRTUAL_GAMEPAD
 )
 if(${def_name})

Source/DiabloUI/diabloui.cpp

@@ -64,6 +64,7 @@ bool UiItemsWraps;
 char *UiTextInput;
 int UiTextInputLen;
 bool textInputActive = true;
+bool allowEmptyTextInput = false;
 
 std::size_t SelectedItem = 0;
 
@@ -111,6 +112,7 @@ void UiInitList(int count, void (*fnFocus)(int value), void (*fnSelect)(int valu
 			auto *pItemUIEdit = static_cast<UiEdit *>(item.get());
 			SDL_SetTextInputRect(&item->m_rect);
 			textInputActive = true;
+			allowEmptyTextInput = pItemUIEdit->m_allowEmpty;
 #ifdef __SWITCH__
 			switch_start_text_input(pItemUIEdit->m_hint, pItemUIEdit->m_value, pItemUIEdit->m_max_length, /*multiline=*/0);
 #elif defined(__vita__)
@@ -425,7 +427,7 @@ void UiFocusNavigationSelect()
 {
 	UiPlaySelectSound();
 	if (textInputActive) {
-		if (strlen(UiTextInput) == 0) {
+		if (!allowEmptyTextInput && strlen(UiTextInput) == 0) {
 			return;
 		}
 #ifndef __SWITCH__

Source/DiabloUI/selgame.cpp

@@ -41,8 +41,6 @@ std::vector<std::unique_ptr<UiItemBase>> vecSelGameDialog;
 std::vector<std::string> Gamelist;
 int HighlightedItem;
 
-constexpr const char *DefaultPassword = "asd";
-
 } // namespace
 
 void selgame_FreeVectors()
@@ -89,11 +87,14 @@ void selgame_GameSelection_Init()
 	SDL_Rect rect4 = { (Sint16)(PANEL_LEFT + 300), (Sint16)(UI_OFFSET_Y + 211), 295, 33 };
 	vecSelGameDialog.push_back(std::make_unique<UiArtText>(_("Select Action"), rect4, UiFlags::AlignCenter | UiFlags::FontSize30 | UiFlags::ColorUiSilver, 3));
 
+#ifdef PACKET_ENCRYPTION
 	vecSelGameDlgItems.push_back(std::make_unique<UiListItem>(_("Create Game"), 0));
-	vecSelGameDlgItems.push_back(std::make_unique<UiListItem>(_("Join Game"), 1));
+#endif
+	vecSelGameDlgItems.push_back(std::make_unique<UiListItem>(_("Create Public Game"), 1));
+	vecSelGameDlgItems.push_back(std::make_unique<UiListItem>(_("Join Game"), 2));
 
 	for (unsigned i = 0; i < Gamelist.size(); i++) {
-		vecSelGameDlgItems.push_back(std::make_unique<UiListItem>(Gamelist[i].c_str(), i + 2));
+		vecSelGameDlgItems.push_back(std::make_unique<UiListItem>(Gamelist[i].c_str(), i + 3));
 	}
 
 	vecSelGameDialog.push_back(std::make_unique<UiList>(vecSelGameDlgItems, PANEL_LEFT + 305, (UI_OFFSET_Y + 255), 285, 26, UiFlags::AlignCenter | UiFlags::FontSize24 | UiFlags::ColorUiGold));
@@ -104,7 +105,13 @@ void selgame_GameSelection_Init()
 	SDL_Rect rect6 = { (Sint16)(PANEL_LEFT + 449), (Sint16)(UI_OFFSET_Y + 427), 140, 35 };
 	vecSelGameDialog.push_back(std::make_unique<UiArtTextButton>(_("CANCEL"), &UiFocusNavigationEsc, rect6, UiFlags::AlignCenter | UiFlags::VerticalCenter | UiFlags::FontSize30 | UiFlags::ColorUiGold));
 
-	UiInitList(vecSelGameDlgItems.size(), selgame_GameSelection_Focus, selgame_GameSelection_Select, selgame_GameSelection_Esc, vecSelGameDialog, true, nullptr, HighlightedItem);
+	auto selectFn = [](int index) {
+		// UiListItem::m_value could be different from
+		// the index if packet encryption is disabled
+		int itemValue = vecSelGameDlgItems[index]->m_value;
+		selgame_GameSelection_Select(itemValue);
+	};
+	UiInitList(vecSelGameDlgItems.size(), selgame_GameSelection_Focus, selectFn, selgame_GameSelection_Esc, vecSelGameDialog, true, nullptr, HighlightedItem);
 }
 
 void selgame_GameSelection_Focus(int value)
@@ -115,6 +122,9 @@ void selgame_GameSelection_Focus(int value)
 		strncpy(selgame_Description, _("Create a new game with a difficulty setting of your choice."), sizeof(selgame_Description) - 1);
 		break;
 	case 1:
+		strncpy(selgame_Description, _("Create a new public game that anyone can join with a difficulty setting of your choice."), sizeof(selgame_Description) - 1);
+		break;
+	case 2:
 		strncpy(selgame_Description, _("Enter an IP or a hostname and join a game already in progress at that address."), sizeof(selgame_Description) - 1);
 		break;
 	default:
@@ -143,9 +153,8 @@ void selgame_GameSelection_Select(int value)
 	selgame_enteringGame = true;
 	selgame_selectedGame = value;
 
-	if (value > 1 && selgame_selectedGame != 0) {
+	if (value > 2) {
-		strcpy(selgame_Ip, Gamelist[value - 2].c_str());
+		strcpy(selgame_Ip, Gamelist[value - 3].c_str());
-		strcpy(selgame_Password, DefaultPassword);
 		selgame_Password_Select(value);
 		return;
 	}
@@ -167,7 +176,8 @@ void selgame_GameSelection_Select(int value)
 	vecSelGameDialog.push_back(std::make_unique<UiArtText>(selgame_Description, rect3, UiFlags::FontSize12 | UiFlags::ColorUiSilverDark, 1, 16));
 
 	switch (value) {
-	case 0: {
+	case 0:
+	case 1: {
 		title = _("Create Game");
 
 		SDL_Rect rect4 = { (Sint16)(PANEL_LEFT + 299), (Sint16)(UI_OFFSET_Y + 211), 295, 35 };
@@ -188,14 +198,14 @@ void selgame_GameSelection_Select(int value)
 		UiInitList(vecSelGameDlgItems.size(), selgame_Diff_Focus, selgame_Diff_Select, selgame_Diff_Esc, vecSelGameDialog, true);
 		break;
 	}
-	case 1: {
+	case 2: {
 		title = _("Join TCP Games");
 
 		SDL_Rect rect4 = { (Sint16)(PANEL_LEFT + 305), (Sint16)(UI_OFFSET_Y + 211), 285, 33 };
 		vecSelGameDialog.push_back(std::make_unique<UiArtText>(_("Enter address"), rect4, UiFlags::AlignCenter | UiFlags::FontSize30 | UiFlags::ColorUiSilver, 3));
 
 		SDL_Rect rect5 = { (Sint16)(PANEL_LEFT + 305), (Sint16)(UI_OFFSET_Y + 314), 285, 33 };
-		vecSelGameDialog.push_back(std::make_unique<UiEdit>(_("Enter address"), selgame_Ip, 128, rect5, UiFlags::FontSize24 | UiFlags::ColorUiGold));
+		vecSelGameDialog.push_back(std::make_unique<UiEdit>(_("Enter address"), selgame_Ip, 128, false, rect5, UiFlags::FontSize24 | UiFlags::ColorUiGold));
 
 		SDL_Rect rect6 = { (Sint16)(PANEL_LEFT + 299), (Sint16)(UI_OFFSET_Y + 427), 140, 35 };
 		vecSelGameDialog.push_back(std::make_unique<UiArtTextButton>(_("OK"), &UiFocusNavigationSelect, rect6, UiFlags::AlignCenter | UiFlags::VerticalCenter | UiFlags::FontSize30 | UiFlags::ColorUiGold));
@@ -204,7 +214,12 @@ void selgame_GameSelection_Select(int value)
 		vecSelGameDialog.push_back(std::make_unique<UiArtTextButton>(_("CANCEL"), &UiFocusNavigationEsc, rect7, UiFlags::AlignCenter | UiFlags::VerticalCenter | UiFlags::FontSize30 | UiFlags::ColorUiGold));
 
 		HighlightedItem = 0;
+
+#ifdef PACKET_ENCRYPTION
 		UiInitList(0, nullptr, selgame_Password_Init, selgame_GameSelection_Init, vecSelGameDialog);
+#else
+		UiInitList(0, nullptr, selgame_Password_Select, selgame_GameSelection_Init, vecSelGameDialog);
+#endif
 		break;
 	}
 	}
@@ -375,7 +390,7 @@ void selgame_Speed_Select(int value)
 {
 	nTickRate = vecSelGameDlgItems[value]->m_value;
 
-	if (provider == SELCONN_LOOPBACK) {
+	if (provider == SELCONN_LOOPBACK || selgame_selectedGame == 1) {
 		selgame_Password_Select(0);
 		return;
 	}
@@ -404,8 +419,10 @@ void selgame_Password_Init(int /*value*/)
 	SDL_Rect rect4 = { (Sint16)(PANEL_LEFT + 305), (Sint16)(UI_OFFSET_Y + 211), 285, 33 };
 	vecSelGameDialog.push_back(std::make_unique<UiArtText>(_("Enter Password"), rect4, UiFlags::AlignCenter | UiFlags::FontSize30 | UiFlags::ColorUiSilver, 3));
 
+	// Allow password to be empty only when joining games
+	bool allowEmpty = selgame_selectedGame == 2;
 	SDL_Rect rect5 = { (Sint16)(PANEL_LEFT + 305), (Sint16)(UI_OFFSET_Y + 314), 285, 33 };
-	vecSelGameDialog.push_back(std::make_unique<UiEdit>(_("Enter Password"), selgame_Password, 15, rect5, UiFlags::FontSize24 | UiFlags::ColorUiGold));
+	vecSelGameDialog.push_back(std::make_unique<UiEdit>(_("Enter Password"), selgame_Password, 15, allowEmpty, rect5, UiFlags::FontSize24 | UiFlags::ColorUiGold));
 
 	SDL_Rect rect6 = { (Sint16)(PANEL_LEFT + 299), (Sint16)(UI_OFFSET_Y + 427), 140, 35 };
 	vecSelGameDialog.push_back(std::make_unique<UiArtTextButton>(_("OK"), &UiFocusNavigationSelect, rect6, UiFlags::AlignCenter | UiFlags::VerticalCenter | UiFlags::FontSize30 | UiFlags::ColorUiGold));
@@ -443,9 +460,15 @@ static bool IsGameCompatible(const GameData &data)
 
 void selgame_Password_Select(int /*value*/)
 {
-	if (selgame_selectedGame != 0) {
+	char *gamePassword = nullptr;
+	if (selgame_selectedGame == 0)
+		gamePassword = selgame_Password;
+	if (selgame_selectedGame == 2 && strlen(selgame_Password) > 0)
+		gamePassword = selgame_Password;
+
+	if (selgame_selectedGame > 1) {
 		strcpy(sgOptions.Network.szPreviousHost, selgame_Ip);
-		if (SNetJoinGame(selgame_Ip, selgame_Password, gdwPlayerId)) {
+		if (SNetJoinGame(selgame_Ip, gamePassword, gdwPlayerId)) {
 			if (!IsGameCompatible(*m_game_data)) {
 				selgame_GameSelection_Select(1);
 				return;
@@ -468,7 +491,7 @@ void selgame_Password_Select(int /*value*/)
 	m_game_data->bTheoQuest = sgOptions.Gameplay.bTheoQuest ? 1 : 0;
 	m_game_data->bCowQuest = sgOptions.Gameplay.bCowQuest ? 1 : 0;
 
-	if (SNetCreateGame(nullptr, selgame_Password, (char *)m_game_data, sizeof(*m_game_data), gdwPlayerId)) {
+	if (SNetCreateGame(nullptr, gamePassword, (char *)m_game_data, sizeof(*m_game_data), gdwPlayerId)) {
 		UiInitList_clear();
 		selgame_endMenu = true;
 	} else {
@@ -481,8 +504,8 @@ void selgame_Password_Select(int /*value*/)
 
 void selgame_Password_Esc()
 {
-	if (selgame_selectedGame == 1)
+	if (selgame_selectedGame == 2)
-		selgame_GameSelection_Select(1);
+		selgame_GameSelection_Select(2);
 	else
 		selgame_GameSpeedSelection();
 }
@@ -524,7 +547,7 @@ bool UiSelectGame(GameData *gameData, int *playerId)
 
 	selgame_endMenu = false;
 
-	DvlNet_SetPassword(DefaultPassword);
+	DvlNet_ClearPassword();
 	DvlNet_ClearGamelist();
 
 	while (!selgame_endMenu) {

Source/DiabloUI/selhero.cpp

@@ -275,7 +275,7 @@ void SelheroClassSelectorSelect(int value)
 	vecSelDlgItems.push_back(std::make_unique<UiArtText>(_("Enter Name"), rect1, UiFlags::AlignCenter | UiFlags::FontSize30 | UiFlags::ColorUiSilver, 3));
 
 	SDL_Rect rect2 = { (Sint16)(PANEL_LEFT + 265), (Sint16)(UI_OFFSET_Y + 317), 320, 33 };
-	vecSelDlgItems.push_back(std::make_unique<UiEdit>(_("Enter Name"), selhero_heroInfo.name, 15, rect2, UiFlags::FontSize24 | UiFlags::ColorUiGold));
+	vecSelDlgItems.push_back(std::make_unique<UiEdit>(_("Enter Name"), selhero_heroInfo.name, 15, false, rect2, UiFlags::FontSize24 | UiFlags::ColorUiGold));
 
 	SDL_Rect rect3 = { (Sint16)(PANEL_LEFT + 279), (Sint16)(UI_OFFSET_Y + 429), 140, 35 };
 	vecSelDlgItems.push_back(std::make_unique<UiArtTextButton>(_("OK"), &UiFocusNavigationSelect, rect3, UiFlags::AlignCenter | UiFlags::FontSize30 | UiFlags::ColorUiGold));

Source/DiabloUI/ui_item.h

@@ -224,11 +224,12 @@ public:
 
 class UiEdit : public UiItemBase {
 public:
-	UiEdit(const char *hint, char *value, std::size_t max_length, SDL_Rect rect, UiFlags flags = UiFlags::None)
+	UiEdit(const char *hint, char *value, std::size_t max_length, bool allowEmpty, SDL_Rect rect, UiFlags flags = UiFlags::None)
 	    : UiItemBase(UiType::Edit, rect, flags)
 	    , m_hint(hint)
 	    , m_value(value)
 	    , m_max_length(max_length)
+	    , m_allowEmpty(allowEmpty)
 	{
 	}
 
@@ -236,6 +237,7 @@ public:
 	const char *m_hint;
 	char *m_value;
 	std::size_t m_max_length;
+	bool m_allowEmpty;
 };
 
 //=============================================================================

Source/automap.cpp

@@ -466,11 +466,12 @@ void DrawAutomapText(const Surface &out)
 			linePosition.y += 15;
 		}
 
-		if (szPlayerDescript[0] != '\0') {
+		if (!PublicGame)
 			strcat(strcpy(desc, _("password: ")), szPlayerDescript);
-			DrawString(out, desc, linePosition);
+		else
-			linePosition.y += 15;
+			strcpy(desc, _("Public Game"));
-		}
+		DrawString(out, desc, linePosition);
+		linePosition.y += 15;
 	}
 
 	if (setlevel) {

Source/dvlnet/abstract_net.h

@@ -22,8 +22,8 @@ public:
 
 class abstract_net {
 public:
-	virtual int create(std::string addrstr, std::string passwd) = 0;
+	virtual int create(std::string addrstr) = 0;
-	virtual int join(std::string addrstr, std::string passwd) = 0;
+	virtual int join(std::string addrstr) = 0;
 	virtual bool SNetReceiveMessage(int *sender, void **data, uint32_t *size) = 0;
 	virtual bool SNetSendMessage(int dest, void *data, unsigned int size) = 0;
 	virtual bool SNetReceiveTurns(char **data, size_t *size, uint32_t *status) = 0;
@@ -44,6 +44,10 @@ public:
 	{
 	}
 
+	virtual void clear_password()
+	{
+	}
+
 	virtual void send_info_request()
 	{
 	}

Source/dvlnet/base.cpp

@@ -17,6 +17,11 @@ void base::setup_password(std::string pw)
 	pktfty = std::make_unique<packet_factory>(pw);
 }
 
+void base::clear_password()
+{
+	pktfty = std::make_unique<packet_factory>();
+}
+
 void base::RunEventHandler(_SNETEVENT &ev)
 {
 	auto f = registered_handlers[static_cast<event_type>(ev.eventid)];

Source/dvlnet/base.h

@@ -14,8 +14,8 @@ namespace net {
 
 class base : public abstract_net {
 public:
-	virtual int create(std::string addrstr, std::string passwd) = 0;
+	virtual int create(std::string addrstr) = 0;
-	virtual int join(std::string addrstr, std::string passwd) = 0;
+	virtual int join(std::string addrstr) = 0;
 
 	virtual bool SNetReceiveMessage(int *sender, void **data, uint32_t *size);
 	virtual bool SNetSendMessage(int playerId, void *data, unsigned int size);
@@ -37,6 +37,7 @@ public:
 	void setup_gameinfo(buffer_t info);
 
 	virtual void setup_password(std::string pw);
+	virtual void clear_password();
 
 	virtual ~base() = default;
 

Source/dvlnet/base_protocol.h

@@ -16,8 +16,8 @@ namespace net {
 template <class P>
 class base_protocol : public base {
 public:
-	virtual int create(std::string addrstr, std::string passwd);
+	virtual int create(std::string addrstr);
-	virtual int join(std::string addrstr, std::string passwd);
+	virtual int join(std::string addrstr);
 	virtual void poll();
 	virtual void send(packet &pkt);
 	virtual void DisconnectNet(plr_t plr);
@@ -108,8 +108,7 @@ void base_protocol<P>::send_info_request()
 template <class P>
 void base_protocol<P>::wait_join()
 {
-	randombytes_buf(reinterpret_cast<unsigned char *>(&cookie_self),
+	cookie_self = packet_out::GenerateCookie();
-	    sizeof(cookie_t));
 	auto pkt = pktfty->make_packet<PT_JOIN_REQUEST>(PLR_BROADCAST,
 	    PLR_MASTER, cookie_self, game_init_info);
 	proto.send(firstpeer, pkt->Data());
@@ -122,9 +121,8 @@ void base_protocol<P>::wait_join()
 }
 
 template <class P>
-int base_protocol<P>::create(std::string addrstr, std::string passwd)
+int base_protocol<P>::create(std::string addrstr)
 {
-	setup_password(passwd);
 	gamename = addrstr;
 
 	if (wait_network()) {
@@ -136,10 +134,8 @@ int base_protocol<P>::create(std::string addrstr, std::string passwd)
 }
 
 template <class P>
-int base_protocol<P>::join(std::string addrstr, std::string passwd)
+int base_protocol<P>::join(std::string addrstr)
 {
-	//addrstr = "fd80:56c2:e21c:0:199:931d:b14:c4d2";
-	setup_password(passwd);
 	gamename = addrstr;
 	if (wait_network())
 		if (wait_firstpeer())

Source/dvlnet/cdwrap.h

@@ -17,12 +17,13 @@ private:
 	std::unique_ptr<abstract_net> dvlnet_wrap;
 	std::map<event_type, SEVTHANDLER> registered_handlers;
 	buffer_t game_init_info;
+	std::optional<std::string> game_pw;
 
 	void reset();
 
 public:
-	virtual int create(std::string addrstr, std::string passwd);
+	virtual int create(std::string addrstr);
-	virtual int join(std::string addrstr, std::string passwd);
+	virtual int join(std::string addrstr);
 	virtual bool SNetReceiveMessage(int *sender, void **data, uint32_t *size);
 	virtual bool SNetSendMessage(int dest, void *data, unsigned int size);
 	virtual bool SNetReceiveTurns(char **data, size_t *size, uint32_t *status);
@@ -41,6 +42,7 @@ public:
 	virtual void clear_gamelist();
 	virtual std::vector<std::string> get_gamelist();
 	virtual void setup_password(std::string pw);
+	virtual void clear_password();
 
 	cdwrap();
 	virtual ~cdwrap() = default;
@@ -58,23 +60,28 @@ void cdwrap<T>::reset()
 	dvlnet_wrap.reset(new T);
 	dvlnet_wrap->setup_gameinfo(game_init_info);
 
+	if (game_pw != std::nullopt)
+		dvlnet_wrap->setup_password(*game_pw);
+	else
+		dvlnet_wrap->clear_password();
+
 	for (const auto &pair : registered_handlers)
 		dvlnet_wrap->SNetRegisterEventHandler(pair.first, pair.second);
 }
 
 template <class T>
-int cdwrap<T>::create(std::string addrstr, std::string passwd)
+int cdwrap<T>::create(std::string addrstr)
 {
 	reset();
-	return dvlnet_wrap->create(addrstr, passwd);
+	return dvlnet_wrap->create(addrstr);
 }
 
 template <class T>
-int cdwrap<T>::join(std::string addrstr, std::string passwd)
+int cdwrap<T>::join(std::string addrstr)
 {
 	game_init_info = buffer_t();
 	reset();
-	return dvlnet_wrap->join(addrstr, passwd);
+	return dvlnet_wrap->join(addrstr);
 }
 
 template <class T>
@@ -186,8 +193,16 @@ std::vector<std::string> cdwrap<T>::get_gamelist()
 template <class T>
 void cdwrap<T>::setup_password(std::string pw)
 {
+	game_pw = pw;
 	return dvlnet_wrap->setup_password(pw);
 }
 
+template <class T>
+void cdwrap<T>::clear_password()
+{
+	game_pw = std::nullopt;
+	return dvlnet_wrap->clear_password();
+}
+
 } // namespace net
 } // namespace devilution

Source/dvlnet/loopback.cpp

@@ -5,12 +5,12 @@
 namespace devilution {
 namespace net {
 
-int loopback::create(std::string /*addrstr*/, std::string /*passwd*/)
+int loopback::create(std::string /*addrstr*/)
 {
 	return plr_single;
 }
 
-int loopback::join(std::string /*addrstr*/, std::string /*passwd*/)
+int loopback::join(std::string /*addrstr*/)
 {
 	ABORT();
 }

Source/dvlnet/loopback.h

@@ -20,8 +20,8 @@ public:
 		plr_single = 0;
 	};
 
-	virtual int create(std::string addrstr, std::string passwd);
+	virtual int create(std::string addrstr);
-	virtual int join(std::string addrstr, std::string passwd);
+	virtual int join(std::string addrstr);
 	virtual bool SNetReceiveMessage(int *sender, void **data, uint32_t *size);
 	virtual bool SNetSendMessage(int dest, void *data, unsigned int size);
 	virtual bool SNetReceiveTurns(char **data, size_t *size, uint32_t *status);

Source/dvlnet/packet.cpp

@@ -1,10 +1,52 @@
+#ifdef PACKET_ENCRYPTION
+#include <sodium.h>
+#else
+#include <chrono>
+#include <random>
+#endif
+
 #include "dvlnet/packet.h"
 
 namespace devilution {
 namespace net {
 
-#ifndef NONET
+#ifdef PACKET_ENCRYPTION
-static constexpr bool DisableEncryption = false;
+
+cookie_t packet_out::GenerateCookie()
+{
+	cookie_t cookie;
+	randombytes_buf(reinterpret_cast<unsigned char *>(&cookie),
+	    sizeof(cookie_t));
+	return cookie;
+}
+
+#else
+
+class cookie_generator {
+public:
+	cookie_generator()
+	{
+		unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
+		generator.seed(seed);
+	}
+
+	cookie_t NewCookie()
+	{
+		return distribution(generator);
+	}
+
+private:
+	std::default_random_engine generator;
+	std::uniform_int_distribution<cookie_t> distribution;
+};
+
+cookie_generator CookieGenerator;
+
+cookie_t packet_out::GenerateCookie()
+{
+	return CookieGenerator.NewCookie();
+}
+
 #endif
 
 const char *packet_type_to_string(uint8_t packetType)
@@ -66,158 +108,153 @@ void CheckPacketTypeOneOf(std::initializer_list<packet_type> expectedTypes, std:
 
 const buffer_t &packet::Data()
 {
-	if (!have_decrypted || !have_encrypted)
+	assert(have_encrypted || have_decrypted);
-		ABORT();
+	if (have_encrypted)
-	return encrypted_buffer;
+		return encrypted_buffer;
+	return decrypted_buffer;
 }
 
 packet_type packet::Type()
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	return m_type;
 }
 
 plr_t packet::Source() const
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	return m_src;
 }
 
 plr_t packet::Destination() const
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	return m_dest;
 }
 
 const buffer_t &packet::Message()
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	CheckPacketTypeOneOf({ PT_MESSAGE }, m_type);
 	return m_message;
 }
 
 turn_t packet::Turn()
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	CheckPacketTypeOneOf({ PT_TURN }, m_type);
 	return m_turn;
 }
 
 cookie_t packet::Cookie()
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	CheckPacketTypeOneOf({ PT_JOIN_REQUEST, PT_JOIN_ACCEPT }, m_type);
 	return m_cookie;
 }
 
 plr_t packet::NewPlayer()
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	CheckPacketTypeOneOf({ PT_JOIN_ACCEPT, PT_CONNECT, PT_DISCONNECT }, m_type);
 	return m_newplr;
 }
 
 const buffer_t &packet::Info()
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	CheckPacketTypeOneOf({ PT_JOIN_REQUEST, PT_JOIN_ACCEPT, PT_CONNECT, PT_INFO_REPLY }, m_type);
 	return m_info;
 }
 
 leaveinfo_t packet::LeaveInfo()
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
 	CheckPacketTypeOneOf({ PT_DISCONNECT }, m_type);
 	return m_leaveinfo;
 }
 
 void packet_in::Create(buffer_t buf)
 {
-	if (have_encrypted || have_decrypted)
+	assert(!have_encrypted && !have_decrypted);
-		ABORT();
+	if (buf.size() < sizeof(packet_type) + 2 * sizeof(plr_t))
-	encrypted_buffer = std::move(buf);
+		throw packet_exception();
+
+	decrypted_buffer = std::move(buf);
+	have_decrypted = true;
+
+	// TCP server implementation forwards the original data to clients
+	// so although we are not decrypting anything,
+	// we save a copy in encrypted_buffer anyway
+	encrypted_buffer = decrypted_buffer;
 	have_encrypted = true;
 }
 
-void packet_in::Decrypt()
+#ifdef PACKET_ENCRYPTION
+void packet_in::Decrypt(buffer_t buf)
 {
-	if (!have_encrypted)
+	assert(!have_encrypted && !have_decrypted);
-		ABORT();
+	encrypted_buffer = std::move(buf);
-	if (have_decrypted)
+	have_encrypted = true;
-		return;
-#ifndef NONET
-	if (!DisableEncryption) {
-		if (encrypted_buffer.size() < crypto_secretbox_NONCEBYTES
-		        + crypto_secretbox_MACBYTES
-		        + sizeof(packet_type) + 2 * sizeof(plr_t))
-			throw packet_exception();
-		auto pktlen = (encrypted_buffer.size()
-		    - crypto_secretbox_NONCEBYTES
-		    - crypto_secretbox_MACBYTES);
-		decrypted_buffer.resize(pktlen);
-		int status = crypto_secretbox_open_easy(
-		    decrypted_buffer.data(),
-		    encrypted_buffer.data() + crypto_secretbox_NONCEBYTES,
-		    encrypted_buffer.size() - crypto_secretbox_NONCEBYTES,
-		    encrypted_buffer.data(),
-		    key.data());
-		if (status != 0)
-			throw packet_exception();
-	} else
-#endif
-	{
-		if (encrypted_buffer.size() < sizeof(packet_type) + 2 * sizeof(plr_t))
-			throw packet_exception();
-		decrypted_buffer = encrypted_buffer;
-	}
 
-	process_data();
+	if (encrypted_buffer.size() < crypto_secretbox_NONCEBYTES
+	        + crypto_secretbox_MACBYTES
+	        + sizeof(packet_type) + 2 * sizeof(plr_t))
+		throw packet_exception();
+	auto pktlen = (encrypted_buffer.size()
+	    - crypto_secretbox_NONCEBYTES
+	    - crypto_secretbox_MACBYTES);
+	decrypted_buffer.resize(pktlen);
+	int status = crypto_secretbox_open_easy(
+	    decrypted_buffer.data(),
+	    encrypted_buffer.data() + crypto_secretbox_NONCEBYTES,
+	    encrypted_buffer.size() - crypto_secretbox_NONCEBYTES,
+	    encrypted_buffer.data(),
+	    key.data());
+	if (status != 0)
+		throw packet_exception();
 
 	have_decrypted = true;
 }
+#endif
 
+#ifdef PACKET_ENCRYPTION
 void packet_out::Encrypt()
 {
-	if (!have_decrypted)
+	assert(have_decrypted);
-		ABORT();
+
 	if (have_encrypted)
 		return;
 
-	process_data();
+	auto lenCleartext = decrypted_buffer.size();
-
+	encrypted_buffer.insert(encrypted_buffer.begin(),
-#ifndef NONET
+	    crypto_secretbox_NONCEBYTES, 0);
-	if (!DisableEncryption) {
+	encrypted_buffer.insert(encrypted_buffer.end(),
-		auto lenCleartext = encrypted_buffer.size();
+	    crypto_secretbox_MACBYTES + lenCleartext, 0);
-		encrypted_buffer.insert(encrypted_buffer.begin(),
+	randombytes_buf(encrypted_buffer.data(), crypto_secretbox_NONCEBYTES);
-		    crypto_secretbox_NONCEBYTES, 0);
+	int status = crypto_secretbox_easy(
-		encrypted_buffer.insert(encrypted_buffer.end(),
+	    encrypted_buffer.data() + crypto_secretbox_NONCEBYTES,
-		    crypto_secretbox_MACBYTES, 0);
+	    decrypted_buffer.data(),
-		randombytes_buf(encrypted_buffer.data(), crypto_secretbox_NONCEBYTES);
+	    lenCleartext,
-		int status = crypto_secretbox_easy(
+	    encrypted_buffer.data(),
-		    encrypted_buffer.data() + crypto_secretbox_NONCEBYTES,
+	    key.data());
-		    encrypted_buffer.data() + crypto_secretbox_NONCEBYTES,
+	if (status != 0)
-		    lenCleartext,
+		ABORT();
-		    encrypted_buffer.data(),
+
-		    key.data());
-		if (status != 0)
-			ABORT();
-	}
-#endif
 	have_encrypted = true;
 }
+#endif
+
+packet_factory::packet_factory()
+{
+	secure = false;
+}
 
 packet_factory::packet_factory(std::string pw)
 {
-#ifndef NONET
+	secure = false;
+
+#ifdef PACKET_ENCRYPTION
 	if (sodium_init() < 0)
 		ABORT();
 	pw.resize(std::min<std::size_t>(pw.size(), crypto_pwhash_argon2id_PASSWD_MAX));
@@ -235,6 +272,7 @@ packet_factory::packet_factory(std::string pw)
 	    crypto_pwhash_ALG_ARGON2ID13);
 	if (status != 0)
 		ABORT();
+	secure = true;
 #endif
 }
 

Source/dvlnet/packet.h

@@ -5,7 +5,7 @@
 #include <memory>
 #include <array>
 #include <cstring>
-#ifndef NONET
+#ifdef PACKET_ENCRYPTION
 #include <sodium.h>
 #endif
 
@@ -35,7 +35,7 @@ typedef uint8_t plr_t;
 typedef uint32_t cookie_t;
 typedef int turn_t;      // change int to something else in devilution code later
 typedef int leaveinfo_t; // also change later
-#ifndef NONET
+#ifdef PACKET_ENCRYPTION
 typedef std::array<unsigned char, crypto_secretbox_KEYBYTES> key_t;
 #else
 // Stub out the key_t defintion as we're not doing any encryption.
@@ -115,7 +115,7 @@ public:
 	void process_element(buffer_t &x);
 	template <class T>
 	void process_element(T &x);
-	void Decrypt();
+	void Decrypt(buffer_t buf);
 };
 
 class packet_out : public packet_proc<packet_out> {
@@ -132,6 +132,7 @@ public:
 	static const unsigned char *begin(const T &x);
 	template <class T>
 	static const unsigned char *end(const T &x);
+	static cookie_t GenerateCookie();
 	void Encrypt();
 };
 
@@ -307,13 +308,13 @@ inline void packet_out::create<PT_DISCONNECT>(plr_t s, plr_t d, plr_t n,
 
 inline void packet_out::process_element(buffer_t &x)
 {
-	encrypted_buffer.insert(encrypted_buffer.end(), x.begin(), x.end());
+	decrypted_buffer.insert(decrypted_buffer.end(), x.begin(), x.end());
 }
 
 template <class T>
 void packet_out::process_element(T &x)
 {
-	encrypted_buffer.insert(encrypted_buffer.end(), begin(x), end(x));
+	decrypted_buffer.insert(decrypted_buffer.end(), begin(x), end(x));
 }
 
 template <class T>
@@ -330,11 +331,13 @@ const unsigned char *packet_out::end(const T &x)
 
 class packet_factory {
 	key_t key = {};
+	bool secure;
 
 public:
 	static constexpr unsigned short max_packet_size = 0xFFFF;
 
-	packet_factory(std::string pw = "");
+	packet_factory();
+	packet_factory(std::string pw);
 	std::unique_ptr<packet> make_packet(buffer_t buf);
 	template <packet_type t, typename... Args>
 	std::unique_ptr<packet> make_packet(Args... args);
@@ -343,8 +346,16 @@ public:
 inline std::unique_ptr<packet> packet_factory::make_packet(buffer_t buf)
 {
 	auto ret = std::make_unique<packet_in>(key);
+#ifndef PACKET_ENCRYPTION
 	ret->Create(std::move(buf));
-	ret->Decrypt();
+#else
+	if (!secure)
+		ret->Create(std::move(buf));
+	else
+		ret->Decrypt(std::move(buf));
+#endif
+	size_t size = ret->Data().size();
+	ret->process_data();
 	return ret;
 }
 
@@ -353,7 +364,11 @@ std::unique_ptr<packet> packet_factory::make_packet(Args... args)
 {
 	auto ret = std::make_unique<packet_out>(key);
 	ret->create<t>(args...);
-	ret->Encrypt();
+	ret->process_data();
+#ifdef PACKET_ENCRYPTION
+	if (secure)
+		ret->Encrypt();
+#endif
 	return ret;
 }
 

Source/dvlnet/tcp_client.cpp

@@ -6,7 +6,6 @@
 #include <exception>
 #include <functional>
 #include <memory>
-#include <sodium.h>
 #include <sstream>
 #include <stdexcept>
 #include <system_error>
@@ -16,24 +15,23 @@
 namespace devilution {
 namespace net {
 
-int tcp_client::create(std::string addrstr, std::string passwd)
+int tcp_client::create(std::string addrstr)
 {
 	try {
 		auto port = sgOptions.Network.nPort;
-		local_server = std::make_unique<tcp_server>(ioc, addrstr, port, passwd);
+		local_server = std::make_unique<tcp_server>(ioc, addrstr, port, *pktfty);
-		return join(local_server->LocalhostSelf(), passwd);
+		return join(local_server->LocalhostSelf());
 	} catch (std::system_error &e) {
 		SDL_SetError("%s", e.what());
 		return -1;
 	}
 }
 
-int tcp_client::join(std::string addrstr, std::string passwd)
+int tcp_client::join(std::string addrstr)
 {
 	constexpr int MsSleep = 10;
 	constexpr int NoSleep = 250;
 
-	setup_password(passwd);
 	try {
 		std::stringstream port;
 		port << sgOptions.Network.nPort;
@@ -46,8 +44,7 @@ int tcp_client::join(std::string addrstr, std::string passwd)
 	}
 	StartReceive();
 	{
-		randombytes_buf(reinterpret_cast<unsigned char *>(&cookie_self),
+		cookie_self = packet_out::GenerateCookie();
-		    sizeof(cookie_t));
 		auto pkt = pktfty->make_packet<PT_JOIN_REQUEST>(PLR_BROADCAST,
 		    PLR_MASTER, cookie_self,
 		    game_init_info);

Source/dvlnet/tcp_client.h

@@ -17,8 +17,8 @@ namespace net {
 
 class tcp_client : public base {
 public:
-	int create(std::string addrstr, std::string passwd);
+	int create(std::string addrstr);
-	int join(std::string addrstr, std::string passwd);
+	int join(std::string addrstr);
 
 	virtual void poll();
 	virtual void send(packet &pkt);

Source/dvlnet/tcp_server.cpp

@@ -12,9 +12,9 @@ namespace devilution {
 namespace net {
 
 tcp_server::tcp_server(asio::io_context &ioc, const std::string &bindaddr,
-    unsigned short port, std::string pw)
+    unsigned short port, packet_factory &pktfty)
     : ioc(ioc)
-    , pktfty(std::move(pw))
+    , pktfty(pktfty)
 {
 	auto addr = asio::ip::address::from_string(bindaddr);
 	auto ep = asio::ip::tcp::endpoint(addr, port);

Source/dvlnet/tcp_server.h

@@ -26,7 +26,7 @@ public:
 class tcp_server {
 public:
 	tcp_server(asio::io_context &ioc, const std::string &bindaddr,
-	    unsigned short port, std::string pw);
+	    unsigned short port, packet_factory &pktfty);
 	std::string LocalhostSelf();
 	void Close();
 	virtual ~tcp_server();
@@ -52,7 +52,7 @@ private:
 	typedef std::shared_ptr<client_connection> scc;
 
 	asio::io_context &ioc;
-	packet_factory pktfty;
+	packet_factory &pktfty;
 	std::unique_ptr<asio::ip::tcp::acceptor> acceptor;
 	std::array<scc, MAX_PLRS> connections;
 	buffer_t game_init_info;

Source/multi.cpp

@@ -51,6 +51,7 @@ DWORD sgdwGameLoops;
 bool gbIsMultiplayer;
 bool sgbTimeout;
 char szPlayerName[128];
+bool PublicGame;
 BYTE gbDeltaSender;
 bool sgbNetInited;
 uint32_t player_state[MAX_PLRS];
@@ -752,6 +753,7 @@ bool NetInit(bool bSinglePlayer)
 		nthread_terminate_game("SNetGetGameInfo1");
 	if (!SNetGetGameInfo(GAMEINFO_PASSWORD, szPlayerDescript, 128))
 		nthread_terminate_game("SNetGetGameInfo2");
+	PublicGame = DvlNet_IsPublicGame();
 
 	return true;
 }

Source/multi.h

@@ -45,6 +45,7 @@ extern GameData sgGameInitInfo;
 extern bool gbSelectProvider;
 extern bool gbIsMultiplayer;
 extern char szPlayerName[128];
+extern bool PublicGame;
 extern BYTE gbDeltaSender;
 extern uint32_t player_state[MAX_PLRS];
 

Source/storm/storm.h

@@ -293,5 +293,7 @@ void DvlNet_SendInfoRequest();
 void DvlNet_ClearGamelist();
 std::vector<std::string> DvlNet_GetGamelist();
 void DvlNet_SetPassword(std::string pw);
+void DvlNet_ClearPassword();
+bool DvlNet_IsPublicGame();
 
 } // namespace devilution

Source/storm/storm_net.cpp

@@ -16,6 +16,7 @@ namespace devilution {
 static std::unique_ptr<net::abstract_net> dvlnet_inst;
 static char gpszGameName[128] = {};
 static char gpszGamePassword[128] = {};
+static bool GameIsPublic = {};
 
 #ifndef NONET
 static SdlMutex storm_net_mutex;
@@ -165,8 +166,10 @@ bool SNetCreateGame(const char *pszGameName, const char *pszGamePassword, char *
 
 	strncpy(gpszGameName, pszGameName, sizeof(gpszGameName) - 1);
 	if (pszGamePassword != nullptr)
-		strncpy(gpszGamePassword, pszGamePassword, sizeof(gpszGamePassword) - 1);
+		DvlNet_SetPassword(pszGamePassword);
-	*playerID = dvlnet_inst->create(pszGameName, pszGamePassword);
+	else
+		DvlNet_ClearPassword();
+	*playerID = dvlnet_inst->create(pszGameName);
 	return *playerID != -1;
 }
 
@@ -178,8 +181,10 @@ bool SNetJoinGame(char *pszGameName, char *pszGamePassword, int *playerID)
 	if (pszGameName != nullptr)
 		strncpy(gpszGameName, pszGameName, sizeof(gpszGameName) - 1);
 	if (pszGamePassword != nullptr)
-		strncpy(gpszGamePassword, pszGamePassword, sizeof(gpszGamePassword) - 1);
+		DvlNet_SetPassword(pszGamePassword);
-	*playerID = dvlnet_inst->join(pszGameName, pszGamePassword);
+	else
+		DvlNet_ClearPassword();
+	*playerID = dvlnet_inst->join(pszGameName);
 	return *playerID != -1;
 }
 
@@ -230,7 +235,21 @@ std::vector<std::string> DvlNet_GetGamelist()
 
 void DvlNet_SetPassword(std::string pw)
 {
+	GameIsPublic = false;
+	strncpy(gpszGamePassword, pw.c_str(), sizeof(gpszGamePassword) - 1);
 	dvlnet_inst->setup_password(std::move(pw));
 }
 
+void DvlNet_ClearPassword()
+{
+	GameIsPublic = true;
+	gpszGamePassword[0] = '\0';
+	dvlnet_inst->clear_password();
+}
+
+bool DvlNet_IsPublicGame()
+{
+	return GameIsPublic;
+}
+
 } // namespace devilution

vcpkg.json

@@ -4,10 +4,13 @@
     "dependencies": [
         "fmt",
         "libpng",
-        "libsodium",
         "sdl2"
     ],
     "features": {
+        "encryption": {
+            "description": "Build libsodium for packet encryption",
+            "dependencies": [ "libsodium" ]
+        },
         "translations": {
             "description": "Build translation files",
             "dependencies": [