Client-to-dbserver

The game client connects to port 7000 to find dbserver, and uses the common Network protocol.

When a QueueServer is in use, then it listens on port 7000 and clients will connect there. Otherwise, dbserver listens on port 7000 and accepts client connections.

dbserver game client interface

When a game client disconnects from dbserver, then:

• if the client is not logged in, dbserver sends AS_QUIT_GAME to authserver with reason 1
• if the client is logged in but does not have an entity loaded, dbserver sends AS_QUIT_GAME to authserver with reason 2
• if the client is loaded onto a MapServer, then the MapServer is sent DBSERVER_FORCE_LOGOUT with reason -1
• if the client is loaded but not connected to a MapServer, then an ACCOUNT_CLIENT_LOGOUT_ACCOUNT is sent to AccountServer and AS_QUIT_GAME is sent to authserver with reason 3

When dbserver receives a command on a link from a client, it first checks if the server is shutting down, and if it is then sends the client DBGAMESERVER_MSG with "ServerShutdown", and quits the client.

When quitting a client:

• If QueueServer is not used, dbserver closes the link
• If QueueServer is used, dbserver sends QUEUESERVER_SVR_REMOVECLIENT to QueueServer for this client

If the client is not logged in, then receiving any message other than DBGAMECLIENT_LOGIN will result in DBGAMESERVER_MSG with "NotLogged", and quits the client.

When QueueServer is used, the protocol is modified by prefixing headers onto packets so that QueueServer can proxy them. See Dbserver-protocols#queue for details.

Commands, client to server

DBGAMECLIENT_LOGIN

Header if QueueServer is in use:

autobits client_ip
autobits client_link_id

Body of request:

string account_name
packint(1) auth_id
packint(1) protocol_version
bits(64) test_auth_data
packint(1) dont_check_version
string game_version
bits(64) game_checksum
bits(32) cookie
optional bits(1) no_timeout
optional string patch_value
optional string not_used
optional zipped system_specs
optional packint(1) keyed_access_level
optional string issued_to

If login fails, and QueueServer is not used, the message is ignored.

If login fails, and QueueServer is used, then a QUEUESERVER_SVR_REMOVECLIENT will be sent to QueueServer and the game client destroyed. (Bug: the pointers are not cleaned up so if more messages come back from QueueServer then dbserver will break)

protocol_version must be DBSERVER_CLIENT_PROTOCOL_VERSION (20110614) or dbserver will send DBGAMESERVER_MSG with "WrongProtocol" and fail login.

test_auth_data is used only if fake auth is enabled, and will be used as the auth user data which AuthServer would have set.

If fake auth is not used, and the correct game client version number begins with "dev:", then version checking is disabled. If dont_check_version is 0 in the request, version checking is disabled. Otherwise, the game_version field is checked for case-insensitive equality with the correct client version recorded in dbserver. If it does not match, dbserver will send DBGAMESERVER_MSG with "WrongVersion %s %s" or "WrongVersionPatcher %s %s" and fail login.

If version checking was disabled by the request from the client, then dbserver will instead attempt to match the "Branch" field of the versions. If both versions have a branch and they don't match, dbserver will send DBGAMESERVER_MSG and fail login.

account_name is stored in the GameClientLink struct with the value sent by the client.

If fake auth is not used, dbserver now checks for a valid auth entry from AuthServer. cookie is used to look up an auth entry, which must match cookie and account_name in order to be used. If it does match, then the following pieces of data are copied from the AuthServer data to the GameClientLink:

• account name
• loyalty
• loyaltyLegacy
• payStat
• auth user data

vip is then set based on payStat, and vipFlagReady is set to 1.

The auth entry is cleared if a match is made. If a match is not made, dbserver will send DBGAMESERVER_MSG with "DBInvalidLogin" and fail login.

If fake auth is used, then test_auth_data is used from the client, the loyalty points are set based on servers.cfg settings, and vip and vipFlagReady are both set to 0. A fake auth_id is generated.

At this point the client is marked as successfully logged in, and AS_PLAY_GAME is sent to AuthServer.

If no_timeout is not 0 and dbserver is not in production mode, then the client link has timeouts disabled.

patch_value is ignored.

system_specs is logged but otherwise ignored.

keyed_access_level and issued_to are ignored, but issued_to is only present if keyed_access_level is not 0.

If the authname limiter is set in servers.cfg, then the account name is now checked against the names in server/db/auto_allowed_authnames.cfg and server/db/allowed_authnames.cfg. If the limiter is set and the account name is not in the allowed lists, and the auth limiter is configured in servers.cfg to enqueue, then the client is set to be queued. Otherwise, dbserver will send DBGAMESERVER_MSG with "AccountNotAllowed" and fail login. (Bug: this has happened after the client is marked as logged in, so they are rejected but still able to send other commands.)

If queue server is used, the queue is now checked to see if players should be allowed to connect, taking the first match in this list:

• People in the auto-login list, or reconnecting players, will be allowed
• Free players are queued if AccountServer is not responding
• Everybody is queued if overload protection is enabled
• If nobody is queued, and MaxPlayers is set in servers.cfg, and the number of online people is less than MaxPlayers, the player is allowed
• If the auth limited is in queueing mode, and the player is allowed to login, and the number of online people is less than MaxPlayers, the player is allowed
• Otherwise they are queued

QUEUESERVER_SVR_ENQUEUESTATUS is then send to QueueServer with the decision made.

If queue server is not used, the player is directly logged in (this procedure will be invoked by QueueServer in QUEUECLIENT_CLIENTPLAY):

• The ShardAccount for this auth_id is marked as logged_in
• DBGAMESERVER_ACCOUNTSERVER_CATALOG is sent to the client
• ACCOUNT_CLIENT_REGISTER_ACCOUNT is sent to AccountServer
• ACCOUNT_CLIENT_AUTH_UPDATE is sent to AccountServer
• ACCOUNT_CLIENT_INVENTORY_REQUEST is sent to AccountServer
• DBGAMESERVER_ACCOUNTSERVER_INVENTORY is sent to the client
• DBGAMESERVER_SEND_PLAYERS is sent to the client

DBGAMECLIENT_CHOOSE_PLAYER

packint(1) slot_index
packint(1) local_map_ip
string name
autobits create_location

slot_index must be in the range 0..MAX_PLAYER_SLOTS-1 (currently 0..47), or the client will be quit.

If the dbserver is VIP-only, and the client does not have VIP status, dbserver responds with DBGAMESERVER_MSG message "CantResumeVIPShard" and processing stops.

character creation

slot_index describes the character slot of this player to be selected. If this slot does not have a character in it, then a new character will be created with name name and location create_location.

The create_location field determines the faction (hero or villain) and starting map, including whether the tutorial will be run.

If the player name is already in use, DBGAMESERVER_MSG message 'DuplicateName "%s"' % name is sent. If the name is empty, DBGAMESERVER_MSG message 'CantResumeEmptyChar' is sent.

The name is then temporarily reserved, an SQL barrier is sent, and an SQL read is sent to find an unlocked slot ID.

When this read returns, the account is checked to make sure it has enough slots to create a new character, and DBGAMESERVER_MSG message "NotEnoughSlots" is sent otherwise.

If there are enough slots, then a new entity is created with these fields set:

AuthId // set to the auth_id from AuthServer
AuthName // set to the account name
StaticMapId // set to the starting map ID
Name // set to the character name
AccessLevel // set to the server default access level
PlayerType // set based on starting location
Ents2[0].PlayerSubType // set to kPlayerSubType_Normal
Ents2[0].PraetorianProgress // set based on starting location
Ents2[0].InfluenceType // set to kPlayerSubType_Normal

character loading

If this slot is has a character in it, then dbserver checks the entity for this slot. If it is currently loaded, or there is a pending database fetch for it, then that entity is logged out (sending DBSERVER_FORCE_LOGOUT to its MapServer if it has one) and DBGAMESERVER_MSG is returned to the client choosing a player, with a message of 'CharacterLoggingOut "%s"' % name, and processing stops.

If there is a character in the slot and it is not loaded, then dbserver checks to see if it is an offlined entity. If it is, then that entity is logged out and dbserver responds with DBGAMESERVER_MSG, message "InternalErrorCantChooseOfflineCharacter". Otherwise, dbserver schedules a database fetch for the entity.

common process

After creating or loading a character, the process continues here.

When the entity has been fetched from the database, processing resumed (in handlePlayerContainerLoaded). If the entity could not be found, then dbserver responds with DBGAMESERVER_MSG, message "CantFindPlayer %d" % entity_id.

If fake auth is not being used, then the auth user data field for this client (send by authserver in the login process) is converted to hex and compared with Ents2[0].AuthUserDataEx in the entity. If they are not the same, the entity is updated with the auth user data from authserver.

If fake auth is being used, some legacy processing to convert the AuthUserData field into Ents2[0].AuthUserDataEx is run. This appears to be obsolete.

The entity is then marked as having valid auth user data.

If the entity is banned, then it is logged out, and dbserver responds with DBGAMESERVER_MSG message 'CharacterBlocked "%s"' % name.

If the entity is locked by account server (in the middle of shard transfer), then it is logged out, and dbserver responds with DBGAMESERVER_MSG message 'CharacterAccLocked "%s"' % name.

If the AuthId field in the entity does not match the one from AuthServer, then the container is updated. (Comments indicate this is to fix up containers broken by dbquery)

If QueueServer is in use, the client_ip field in the entity struct is set to the IP address sent by QueueServer. Otherwise, it is set to the address of the link.

If the entity is currently marked active or logging in, it is forcibly logged out, and dbserver responds with DBGAMESERVER_MSG message 'AccountLogging %s "%s"' % account_name, entity_name.

The authname limiter is now checked, in the same manner described in DBGAMECLIENT_LOGIN. If this account is not allowed to login at this time, then the entity is forcibly logged out, and dbserver responds with DBGAMESERVER_MSG message 'AccountNotAllowed %s "%s"' account_name, denied_message.

dbserver will look for a clone of the entity's static map, and select one based on the number of players currently on it. If local_map_ip is set, then the MapServer with that IP address is selected instead. If no such MapServer exists, the entity is logged out, nd dbserver responds with DBGAMESERVER_MSG message "CantFindLocalMapServer %s" % ip.

If the entity loading process is already begin and handed to a MapServer, then dbserver sends DBGAMECLIENT_MSG to this link with "DuplicateLogin" and quits it. If the link used in the loading process is different to this one, then that link is also sent the same message, and disconnected.

A COMMCONTROL_IDLE control message is sent to the client. Comments indicate this is because the loading process can take a long time.

The map loading process is started, launching a new MapServer if necessary. The MapId and, if necessary, StaticMapId fields in the entity container are updated with the map ID.

The entity is added to the list of waiting entities for this MapServer, which is then polled to see if the MapServer is ready to load it. When the MapServer is ready (not marked as starting), then the entity is locked to this MapServer, and DBSERVER_CONTAINERS is sent to it. DBSERVER_ACCOUNTSERVER_LOYALTY might also be sent.

If the map loading fails for whatever reason, some DBGAMESERVER_MSG will be sent with an error message, and the entity will be unloaded. If the character is newly created, the entity will also be deleted.

If the map loading succeeds, then the entity will be marked as logging in and connected. No messages are sent to the client at this time (the next step is handled by MapServer).

DBGAMECLIENT_ACCOUNTSERVER_UNSECURE_CMD

This command is ignored.

DBCLIENT_ACCOUNTSERVER_CMD

In production mode, this command is ignored.

In development mode, this message is proxied to AccountServer as ACCOUNT_CLIENT_SLASHCMD:

autobits message_dbid
autobits auth_id
autobits dbid
string cmd