Prepare Protocol v25 init & authentication.

* TOSERVER_INIT and TOCLIENT_INIT renamed to _LEGACY
* TOSERVER_PASSWORD merged from dev-0.5, can use protocol v24 and v25
* TOCLIENT_ACCESS_DENIED merged from dev-0.5, can use protocol v24 and v25, with normalized strings an a custom id for custom errors
* new TOSERVER_INIT packet only send MT version, supported compressions, protocols and serialization, this permit to rework everything later without break the _INIT packet
* new TOSERVER_AUTH packet which auth the client
* new TOCLIENT_HELLO packet which send server serialization version atm
* new TOCLIENT_AUTH_ACCEPTED which is send when TOCLIENT_AUTH was okay. After this packet, the client load datas from servers, like after TOCLIENT_INIT_LEGACY packet

src/client.h

@@ -349,7 +349,9 @@ class Client : public con::PeerHandler, public InventoryManager, public IGameDef
 
 	void handleCommand_Null(NetworkPacket* pkt) {};
 	void handleCommand_Deprecated(NetworkPacket* pkt);
-	void handleCommand_Init(NetworkPacket* pkt);
+	void handleCommand_Hello(NetworkPacket* pkt);
+	void handleCommand_AuthAccept(NetworkPacket* pkt);
+	void handleCommand_InitLegacy(NetworkPacket* pkt);
 	void handleCommand_AccessDenied(NetworkPacket* pkt);
 	void handleCommand_RemoveNode(NetworkPacket* pkt);
 	void handleCommand_AddNode(NetworkPacket* pkt);

src/clientiface.h

@@ -217,6 +217,7 @@ class RemoteClient
 		m_version_minor(0),
 		m_version_patch(0),
 		m_full_version("unknown"),
+		m_supported_compressions(0),
 		m_connection_time(getTime(PRECISION_SECONDS))
 	{
 	}
@@ -293,6 +294,9 @@ class RemoteClient
 	void setPendingSerializationVersion(u8 version)
 		{ m_pending_serialization_version = version; }
 
+	void setSupportedCompressionModes(u8 byteFlag)
+		{ m_supported_compressions = byteFlag; }
+
 	void confirmSerializationVersion()
 		{ serialization_version = m_pending_serialization_version; }
 
@@ -370,6 +374,8 @@ class RemoteClient
 
 	std::string m_full_version;
 
+	u8 m_supported_compressions;
+
 	/*
 		time this client was created
 	 */

src/network/clientopcodes.cpp

@@ -26,8 +26,8 @@ const ToClientCommandHandler toClientCommandTable[TOCLIENT_NUM_MSG_TYPES] =
 {
 	null_command_handler, // 0x00 (never use this)
 	null_command_handler, // 0x01
-	null_command_handler, // 0x02
-	null_command_handler, // 0x03
+	{ "TOCLIENT_HELLO",                   TOCLIENT_STATE_NOT_CONNECTED, &Client::handleCommand_Hello }, // 0x02
+	{ "TOCLIENT_AUTH_ACCEPT",             TOCLIENT_STATE_NOT_CONNECTED, &Client::handleCommand_AuthAccept }, // 0x03
 	null_command_handler, // 0x04
 	null_command_handler, // 0x05
 	null_command_handler, // 0x06
@@ -40,7 +40,7 @@ const ToClientCommandHandler toClientCommandTable[TOCLIENT_NUM_MSG_TYPES] =
 	null_command_handler, // 0x0D
 	null_command_handler, // 0x0E
 	null_command_handler, // 0x0F
-	{ "TOCLIENT_INIT",                    TOCLIENT_STATE_NOT_CONNECTED, &Client::handleCommand_Init }, // 0x10
+	{ "TOCLIENT_INIT",                    TOCLIENT_STATE_NOT_CONNECTED, &Client::handleCommand_InitLegacy }, // 0x10
 	null_command_handler,
 	null_command_handler,
 	null_command_handler,

src/network/networkprotocol.h

@@ -110,14 +110,21 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 		ContentFeatures: change number of special tiles to 6 (CF_SPECIAL_COUNT)
 	PROTOCOL_VERSION 25:
 		Rename TOCLIENT_ACCESS_DENIED to TOCLIENT_ACCESS_DENIED_LEGAGY
-		Rename TOCLIENT_DELETE_PARTICLESPAWNER to TOCLIENT_DELETE_PARTICLESPAWNER_LEGACY
+		Rename TOCLIENT_DELETE_PARTICLESPAWNER to
+			TOCLIENT_DELETE_PARTICLESPAWNER_LEGACY
 		Rename TOSERVER_PASSWORD to TOSERVER_PASSWORD_LEGACY
 		Rename TOSERVER_INIT to TOSERVER_INIT_LEGACY
+		Rename TOCLIENT_INIT to TOCLIENT_INIT_LEGACY
 		Add TOCLIENT_ACCESS_DENIED new opcode (0x0A), using error codes
 			for standard error, keeping customisation possible. This
 			permit translation
 		Add TOCLIENT_DELETE_PARTICLESPAWNER (0x53), fixing the u16 read and
 			reading u32
+		Add TOSERVER_INIT new opcode (0x02) for client presentation to server
+		Add TOSERVER_AUTH new opcode (0x03) for client authentication
+		Add TOCLIENT_HELLO for presenting server to client after client
+			presentation
+		Add TOCLIENT_AUTH_ACCEPT to accept connexion from client
 */
 
 #define LATEST_PROTOCOL_VERSION 24
@@ -143,14 +150,16 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 enum ToClientCommand
 {
+	TOCLIENT_HELLO = 0x02,
+	TOCLIENT_AUTH_ACCEPT = 0x03,
 	TOCLIENT_ACCESS_DENIED = 0x0A,
 	/*
 		u16 command
 		u16 reason_length
 		wstring reason
 	*/
 
-	TOCLIENT_INIT = 0x10,
+	TOCLIENT_INIT_LEGACY = 0x10,
 	/*
 		Server's reply to TOSERVER_INIT.
 		Sent second after connected.
@@ -585,17 +594,22 @@ enum ToClientCommand
 
 enum ToServerCommand
 {
-	TOSERVER_INIT = 0x0F,
+	TOSERVER_INIT = 0x02,
 	/*
 		Sent first after connected.
 
 		[0] u16 TOSERVER_INIT
 		[2] u8 SER_FMT_VER_HIGHEST_READ
 		[3] u8 compression_modes
-		[4] std::string player_name
-		[4+*] std::string password (new in some version)
-		[4+*+*] u16 minimum supported network protocol version (added sometime)
-		[4+*+*+2] u16 maximum supported network protocol version (added later than the previous one)
+	*/
+
+	TOSERVER_AUTH = 0x03,
+	/*
+		Sent first after presentation (INIT).
+		[0] std::string player_name
+		[0+*] std::string password (new in some version)
+		[0+*+*] u16 minimum supported network protocol version (added sometime)
+		[0+*+*+2] u16 maximum supported network protocol version (added later than the previous one)
 	*/
 
 	TOSERVER_INIT_LEGACY = 0x10,
@@ -856,8 +870,9 @@ enum AccessDeniedCode {
 	SERVER_ACCESSDENIED_TOO_MANY_USERS = 6,
 	SERVER_ACCESSDENIED_EMPTY_PASSWORD = 7,
 	SERVER_ACCESSDENIED_ALREADY_CONNECTED = 8,
-	SERVER_ACCESSDENIED_CUSTOM_STRING = 9,
-	SERVER_ACCESSDENIED_MAX = 10,
+	SERVER_ACCESSDENIED_SERVER_FAIL = 9,
+	SERVER_ACCESSDENIED_CUSTOM_STRING = 10,
+	SERVER_ACCESSDENIED_MAX = 11,
 };
 
 enum NetProtoCompressionMode {
@@ -874,6 +889,7 @@ const static std::wstring accessDeniedStrings[SERVER_ACCESSDENIED_MAX] = {
 	L"Too many users.",
 	L"Empty passwords are disallowed. Set a password and try again.",
 	L"Another client is connected with this name. If your client closed unexpectedly, try again in a minute.",
+	L"Server authenticator failed. Maybe the servers has some problems."
 	L"",
 };
 

src/network/packethandlers/client.cpp

@@ -38,19 +38,64 @@ void Client::handleCommand_Deprecated(NetworkPacket* pkt)
 			<< pkt->getPeerId() << "!" << std::endl;
 }
 
-void Client::handleCommand_Init(NetworkPacket* pkt)
+void Client::handleCommand_Hello(NetworkPacket* pkt)
 {
 	if (pkt->getSize() < 1)
 		return;
 
 	u8 deployed;
 	*pkt >> deployed;
 
-	infostream << "Client: TOCLIENT_INIT received with "
+	infostream << "Client: TOCLIENT_HELLO received with "
 			"deployed=" << ((int)deployed & 0xff) << std::endl;
 
 	if (!ser_ver_supported(deployed)) {
-		infostream << "Client: TOCLIENT_INIT: Server sent "
+		infostream << "Client: TOCLIENT_HELLO: Server sent "
+				<< "unsupported ser_fmt_ver"<< std::endl;
+		return;
+	}
+
+	m_server_ser_ver = deployed;
+
+	// @ TODO auth to server
+}
+
+void Client::handleCommand_AuthAccept(NetworkPacket* pkt)
+{
+	v3f playerpos;
+	*pkt >> playerpos >> m_map_seed >> m_recommended_send_interval;
+
+	playerpos -= v3f(0, BS / 2, 0);
+
+	// Set player position
+	Player *player = m_env.getLocalPlayer();
+	assert(player != NULL);
+	player->setPosition(playerpos);
+
+	infostream << "Client: received map seed: " << m_map_seed << std::endl;
+	infostream << "Client: received recommended send interval "
+					<< m_recommended_send_interval<<std::endl;
+
+	// Reply to server
+	NetworkPacket* resp_pkt = new NetworkPacket(TOSERVER_INIT2, 0);
+	Send(resp_pkt);
+
+	m_state = LC_Init;
+}
+
+void Client::handleCommand_InitLegacy(NetworkPacket* pkt)
+{
+	if (pkt->getSize() < 1)
+		return;
+
+	u8 deployed;
+	*pkt >> deployed;
+
+	infostream << "Client: TOCLIENT_INIT_LEGACY received with "
+			"deployed=" << ((int)deployed & 0xff) << std::endl;
+
+	if (!ser_ver_supported(deployed)) {
+		infostream << "Client: TOCLIENT_INIT_LEGACY: Server sent "
 				<< "unsupported ser_fmt_ver"<< std::endl;
 		return;
 	}
@@ -98,10 +143,11 @@ void Client::handleCommand_AccessDenied(NetworkPacket* pkt)
 	m_access_denied_reason = L"Unknown";
 
 	if (pkt->getCommand() == TOCLIENT_ACCESS_DENIED) {
+		if (pkt->getSize() < 1)
+			return;
+
 		u8 denyCode = SERVER_ACCESSDENIED_UNEXPECTED_DATA;
-		if(pkt->getSize() >= 1) {
-			*pkt >> denyCode;
-		}
+		*pkt >> denyCode;
 		if (denyCode == SERVER_ACCESSDENIED_CUSTOM_STRING) {
 			*pkt >> m_access_denied_reason;
 		}