implement bb meet user

src/CommandFormats.hh

@@ -1158,10 +1158,14 @@ struct C_Login_BB_93 {
   le_uint32_t guild_card_number;
   ptext<char, 0x08> unused;
   le_uint32_t team_id;
-  ptext<char, 0x10> username;
-  ptext<char, 0x20> unused2;
-  ptext<char, 0x10> password;
-  ptext<char, 0x28> unused3;
+  ptext<char, 0x30> username;
+  ptext<char, 0x30> password;
+
+  // These fields map to the same fields in C_Login_MeetUserExtension. There is
+  // no equivalent of the name field from that structure on BB (though newserv
+  // doesn't use it anyway).
+  le_uint32_t menu_id;
+  le_uint32_t preferred_lobby_id;
 
   // Note: Unlike other versions, BB puts the version string in the client
   // config at connect time. So the first time the server gets this command, it

src/ReceiveCommands.cc

@@ -107,6 +107,14 @@ void process_login_complete(shared_ptr<ServerState> s, shared_ptr<Client> c) {
       send_ep3_rank_update(c);
     }
 
+    // On BB, send the pre-lobby event, if set. This normally happens on the
+    // login server immediately after the encryption init command, but on BB we
+    // don't know the client's state until after we receive the login command,
+    // so we do it here instead.
+    if ((c->version == GameVersion::BB) && s->pre_lobby_event) {
+      send_change_event(c, s->pre_lobby_event);
+    }
+
     if (s->welcome_message.empty() ||
         (c->flags & Client::Flag::NO_MESSAGE_BOX_CLOSE_CONFIRMATION) ||
         !(c->flags & Client::Flag::AT_WELCOME_MESSAGE)) {