implement meet user on dcv1

src/CommandFormats.hh

@@ -1218,13 +1218,21 @@ struct C_RegisterV1_DC_92 {
 
 // 93 (C->S): Log in (DCv1)
 
+template <typename CharT>
+struct C_Login_MeetUserExtension {
+  le_uint32_t menu_id;
+  le_uint32_t preferred_lobby_id;
+  parray<uint8_t, 0x3C> unknown_a1;
+  ptext<CharT, 0x20> target_player_name;
+};
+
 struct C_LoginV1_DC_93 {
   le_uint32_t player_tag;
   le_uint32_t guild_card_number;
   le_uint32_t unknown_a1;
   le_uint32_t unknown_a2;
   le_uint32_t sub_version;
-  uint8_t unknown_a3; // Probably is_extended
+  uint8_t is_extended;
   uint8_t language;
   parray<uint8_t, 2> unused1;
   ptext<char, 0x11> serial_number;
@@ -1237,7 +1245,7 @@ struct C_LoginV1_DC_93 {
 };
 
 struct C_LoginExtendedV1_DC_93 : C_LoginV1_DC_93 {
-  parray<uint8_t, 0x64> unused3;
+  C_Login_MeetUserExtension<char> extension;
 };
 
 // 93 (C->S): Log in (BB)
@@ -1407,14 +1415,6 @@ struct C_Register_BB_9C {
 // selected the Meet User option, in which case it specifies the requested lobby
 // by its menu ID and item ID.
 
-template <typename CharT>
-struct C_Login_MeetUserExtension {
-  le_uint32_t menu_id;
-  le_uint32_t preferred_lobby_id;
-  parray<uint8_t, 0x3C> unknown_a1;
-  ptext<CharT, 0x20> target_player_name;
-};
-
 struct C_Login_DC_PC_GC_9D {
   le_uint32_t player_tag; // 0x00010000 if guild card is set (via 04)
   le_uint32_t guild_card_number; // 0xFFFFFFFF if not set

src/ProxyCommands.cc

@@ -238,7 +238,7 @@ static HandlerResult process_server_dc_pc_v3_patch_02_17(
       cmd.unknown_a1 = 0;
       cmd.unknown_a2 = 0;
       cmd.sub_version = session.sub_version;
-      cmd.unknown_a3 = 0;
+      cmd.is_extended = 0;
       cmd.language = session.language;
       cmd.serial_number = string_printf("%08" PRIX32 "",
           session.license->serial_number);

src/ReceiveCommands.cc

@@ -280,6 +280,13 @@ void process_login_3_dc_pc_v3(shared_ptr<ServerState> s, shared_ptr<Client> c,
     }
   }
 
+  if (cmd.is_extended) {
+    const auto& ext_cmd = check_size_t<C_LoginExtendedV1_DC_93>(data);
+    if (ext_cmd.extension.menu_id == MenuID::LOBBY) {
+      c->preferred_lobby_id = ext_cmd.extension.preferred_lobby_id;
+    }
+  }
+
   send_update_client_config(c);
 
   process_login_complete(s, c);