From 24b5ffbfcadf360dc5e95f8f66143ffcc681335d Mon Sep 17 00:00:00 2001
From: Steveice10 <1269164+Steveice10@users.noreply.github.com>
Date: Fri, 8 Dec 2023 23:34:44 -0800
Subject: [PATCH] boss: Implement Spotpass service (part 1) (#7232)

* boss: Implement Spotpass service (part 1)

* boss: Fix save state (de)serialization.

* boss: Fix casing of SpotPass in log messages.

* boss: Minor logging improvements.

* common: Add boost serialization support for std::variant.

---------

Co-authored-by: Rokkubro <lachlanb03@gmail.com>
Co-authored-by: FearlessTobi <thm.frey@gmail.com>
---
 src/common/CMakeLists.txt                     |   1 +
 .../serialization/boost_std_variant.hpp       | 204 +++++++++
 src/core/CMakeLists.txt                       |   2 +
 src/core/hle/service/boss/boss.cpp            | 321 +++++++++-----
 src/core/hle/service/boss/boss.h              |  50 ++-
 src/core/hle/service/boss/online_service.cpp  | 400 ++++++++++++++++++
 src/core/hle/service/boss/online_service.h    | 169 ++++++++
 7 files changed, 1018 insertions(+), 129 deletions(-)
 create mode 100644 src/common/serialization/boost_std_variant.hpp
 create mode 100644 src/core/hle/service/boss/online_service.cpp
 create mode 100644 src/core/hle/service/boss/online_service.h

diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 6b97b6837..fa6b7a7af 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -127,6 +127,7 @@ add_library(citra_common STATIC
     serialization/boost_discrete_interval.hpp
     serialization/boost_flat_set.h
     serialization/boost_small_vector.hpp
+    serialization/boost_std_variant.hpp
     serialization/boost_vector.hpp
     static_lru_cache.h
     string_literal.h
diff --git a/src/common/serialization/boost_std_variant.hpp b/src/common/serialization/boost_std_variant.hpp
new file mode 100644
index 000000000..b00f827b1
--- /dev/null
+++ b/src/common/serialization/boost_std_variant.hpp
@@ -0,0 +1,204 @@
+#ifndef BOOST_SERIALIZATION_STD_VARIANT_HPP
+#define BOOST_SERIALIZATION_STD_VARIANT_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// variant.hpp - non-intrusive serialization of variant types
+//
+// copyright (c) 2019 Samuel Debionne, ESRF
+//
+// Use, modification and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org for updates, documentation, and revision history.
+//
+// Widely inspired form boost::variant serialization
+//
+
+#include <boost/serialization/throw_exception.hpp>
+
+#include <variant>
+
+#include <boost/archive/archive_exception.hpp>
+
+#include <boost/serialization/split_free.hpp>
+#include <boost/serialization/serialization.hpp>
+#include <boost/serialization/nvp.hpp>
+
+namespace boost {
+namespace serialization {
+
+template<class Archive>
+struct std_variant_save_visitor
+{
+    std_variant_save_visitor(Archive& ar) :
+        m_ar(ar)
+    {}
+    template<class T>
+    void operator()(T const & value) const
+    {
+        m_ar << BOOST_SERIALIZATION_NVP(value);
+    }
+private:
+    Archive & m_ar;
+};
+
+
+template<class Archive>
+struct std_variant_load_visitor
+{
+    std_variant_load_visitor(Archive& ar) :
+        m_ar(ar)
+    {}
+    template<class T>
+    void operator()(T & value) const
+    {
+        m_ar >> BOOST_SERIALIZATION_NVP(value);
+    }
+private:
+    Archive & m_ar;
+};
+
+template<class Archive, class ...Types>
+void save(
+    Archive & ar,
+    std::variant<Types...> const & v,
+    unsigned int /*version*/
+){
+    const std::size_t which = v.index();
+    ar << BOOST_SERIALIZATION_NVP(which);
+    std_variant_save_visitor<Archive> visitor(ar);
+    std::visit(visitor, v);
+}
+
+// Minimalist metaprogramming for handling parameter pack
+namespace mp {
+    namespace detail {
+    template <typename Seq>
+    struct front_impl;
+
+    template <template <typename...> class Seq, typename T, typename... Ts>
+    struct front_impl<Seq<T, Ts...>> {
+        using type = T;
+    };
+
+    template <typename Seq>
+    struct pop_front_impl;
+
+    template <template <typename...> class Seq, typename T, typename... Ts>
+    struct pop_front_impl<Seq<T, Ts...>> {
+        using type = Seq<Ts...>;
+    };
+    } //namespace detail
+
+    template <typename... Ts>
+    struct typelist {};
+
+    template <typename Seq>
+    using front = typename detail::front_impl<Seq>::type;
+
+    template <typename Seq>
+    using pop_front = typename detail::pop_front_impl<Seq>::type;
+}  // namespace mp
+
+template<std::size_t N, class Seq>
+struct variant_impl
+{
+    template<class Archive, class V>
+    static void load (
+        Archive & ar,
+        std::size_t which,
+        V & v,
+        const unsigned int version
+    ){
+        if(which == 0){
+            // note: A non-intrusive implementation (such as this one)
+            // necessary has to copy the value.  This wouldn't be necessary
+            // with an implementation that de-serialized to the address of the
+            // aligned storage included in the variant.
+            using type = mp::front<Seq>;
+            type value;
+            ar >> BOOST_SERIALIZATION_NVP(value);
+            v = std::move(value);
+            type * new_address = & std::get<type>(v);
+            ar.reset_object_address(new_address, & value);
+            return;
+        }
+        //typedef typename mpl::pop_front<S>::type type;
+        using types = mp::pop_front<Seq>;
+        variant_impl<N - 1, types>::load(ar, which - 1, v, version);
+    }
+};
+
+template<class Seq>
+struct variant_impl<0, Seq>
+{
+    template<class Archive, class V>
+    static void load (
+        Archive & /*ar*/,
+        std::size_t /*which*/,
+        V & /*v*/,
+        const unsigned int /*version*/
+    ){}
+};
+
+template<class Archive, class... Types>
+void load(
+    Archive & ar,
+    std::variant<Types...>& v,
+    const unsigned int version
+){
+    std::size_t which;
+    ar >> BOOST_SERIALIZATION_NVP(which);
+    if(which >=  sizeof...(Types))
+        // this might happen if a type was removed from the list of variant types
+        boost::serialization::throw_exception(
+            boost::archive::archive_exception(
+                boost::archive::archive_exception::unsupported_version
+            )
+        );
+    variant_impl<sizeof...(Types), mp::typelist<Types...>>::load(ar, which, v, version);
+}
+
+template<class Archive,class... Types>
+inline void serialize(
+    Archive & ar,
+    std::variant<Types...> & v,
+    const unsigned int file_version
+){
+    split_free(ar,v,file_version);
+}
+
+// Specialization for std::monostate
+template<class Archive>
+void serialize(Archive &ar, std::monostate &, const unsigned int /*version*/)
+{}
+
+} // namespace serialization
+} // namespace boost
+
+//template<typename T0_, BOOST_VARIANT_ENUM_SHIFTED_PARAMS(typename T)>
+
+#include <boost/serialization/tracking.hpp>
+
+namespace boost {
+    namespace serialization {
+
+template<class... Types>
+struct tracking_level<
+    std::variant<Types...>
+>{
+    typedef mpl::integral_c_tag tag;
+    typedef mpl::int_< ::boost::serialization::track_always> type;
+    BOOST_STATIC_CONSTANT(int, value = type::value);
+};
+
+} // namespace serialization
+} // namespace boost
+
+#endif //BOOST_SERIALIZATION_VARIANT_HPP
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 0a4570bcc..e2939df8a 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -234,6 +234,8 @@ add_library(citra_core STATIC
     hle/service/boss/boss_p.h
     hle/service/boss/boss_u.cpp
     hle/service/boss/boss_u.h
+    hle/service/boss/online_service.cpp
+    hle/service/boss/online_service.h
     hle/service/cam/cam.cpp
     hle/service/cam/cam.h
     hle/service/cam/cam_c.cpp
diff --git a/src/core/hle/service/boss/boss.cpp b/src/core/hle/service/boss/boss.cpp
index ea29786cd..2fa648937 100644
--- a/src/core/hle/service/boss/boss.cpp
+++ b/src/core/hle/service/boss/boss.cpp
@@ -2,6 +2,7 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include "common/archives.h"
 #include "common/logging/log.h"
 #include "core/core.h"
 #include "core/hle/ipc_helpers.h"
@@ -10,17 +11,66 @@
 #include "core/hle/service/boss/boss_p.h"
 #include "core/hle/service/boss/boss_u.h"
 
+SERVICE_CONSTRUCT_IMPL(Service::BOSS::Module)
+SERIALIZE_EXPORT_IMPL(Service::BOSS::Module)
+SERIALIZE_EXPORT_IMPL(Service::BOSS::Module::SessionData)
+
 namespace Service::BOSS {
 
+template <class Archive>
+void Module::serialize(Archive& ar, const unsigned int) {
+    ar& task_finish_event;
+    ar& new_arrival_flag;
+    ar& ns_data_new_flag;
+    ar& ns_data_new_flag_privileged;
+    ar& output_flag;
+}
+SERIALIZE_IMPL(Module)
+
+template <class Archive>
+void Module::SessionData::serialize(Archive& ar, const unsigned int) {
+    ar& boost::serialization::base_object<Kernel::SessionRequestHandler::SessionDataBase>(*this);
+    ar& online_service;
+}
+SERIALIZE_IMPL(Module::SessionData)
+
+std::shared_ptr<OnlineService> Module::Interface::GetSessionService(
+    Kernel::HLERequestContext& ctx) {
+    const auto session_data = GetSessionData(ctx.Session());
+    if (session_data == nullptr || session_data->online_service == nullptr) {
+        LOG_WARNING(Service_BOSS, "Client attempted to use uninitialized BOSS session.");
+
+        // TODO: Error code for uninitialized session.
+        IPC::RequestParser rp(ctx);
+        IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
+        rb.Push(RESULT_UNKNOWN);
+        return nullptr;
+    }
+    return session_data->online_service;
+}
+
 void Module::Interface::InitializeSession(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
-    const u64 programID = rp.Pop<u64>();
+    const u64 program_id = rp.Pop<u64>();
     rp.PopPID();
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
-    rb.Push(RESULT_SUCCESS);
+    const auto session_data = GetSessionData(ctx.Session());
+    if (session_data->online_service == nullptr) {
+        u64 curr_program_id;
+        u64 curr_extdata_id;
+        boss->system.GetAppLoader().ReadProgramId(curr_program_id);
+        boss->system.GetAppLoader().ReadExtdataId(curr_extdata_id);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) programID={:#018X}", programID);
+        session_data->online_service =
+            std::make_shared<OnlineService>(curr_program_id, curr_extdata_id);
+    }
+
+    const auto result = session_data->online_service->InitializeSession(program_id);
+
+    IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
+    rb.Push(result);
+
+    LOG_DEBUG(Service_BOSS, "called, program_id={:#018x}", program_id);
 }
 
 void Module::Interface::SetStorageInfo(Kernel::HLERequestContext& ctx) {
@@ -33,7 +83,7 @@ void Module::Interface::SetStorageInfo(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
 
     LOG_WARNING(Service_BOSS,
-                "(STUBBED) extdata_id={:#018X}, boss_size={:#010X}, extdata_type={:#04X}",
+                "(STUBBED) extdata_id={:#018x}, boss_size={:#010x}, extdata_type={:#04x}",
                 extdata_id, boss_size, extdata_type);
 }
 
@@ -80,7 +130,7 @@ void Module::Interface::RegisterPrivateClientCert(Kernel::HLERequestContext& ctx
     rb.PushMappedBuffer(buffer1);
     rb.PushMappedBuffer(buffer2);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) buffer1_size={:#010X}, buffer2_size={:#010X}, ",
+    LOG_WARNING(Service_BOSS, "(STUBBED) buffer1_size={:#010x}, buffer2_size={:#010x}, ",
                 buffer1_size, buffer2_size);
 }
 
@@ -89,9 +139,9 @@ void Module::Interface::GetNewArrivalFlag(Kernel::HLERequestContext& ctx) {
 
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u8>(new_arrival_flag);
+    rb.Push<u8>(boss->new_arrival_flag);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) new_arrival_flag={}", new_arrival_flag);
+    LOG_WARNING(Service_BOSS, "(STUBBED) new_arrival_flag={}", boss->new_arrival_flag);
 }
 
 void Module::Interface::RegisterNewArrivalEvent(Kernel::HLERequestContext& ctx) {
@@ -106,12 +156,12 @@ void Module::Interface::RegisterNewArrivalEvent(Kernel::HLERequestContext& ctx)
 
 void Module::Interface::SetOptoutFlag(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
-    output_flag = rp.Pop<u8>();
+    boss->output_flag = rp.Pop<u8>();
 
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
-    LOG_WARNING(Service_BOSS, "output_flag={}", output_flag);
+    LOG_WARNING(Service_BOSS, "output_flag={}", boss->output_flag);
 }
 
 void Module::Interface::GetOptoutFlag(Kernel::HLERequestContext& ctx) {
@@ -119,9 +169,9 @@ void Module::Interface::GetOptoutFlag(Kernel::HLERequestContext& ctx) {
 
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u8>(output_flag);
+    rb.Push<u8>(boss->output_flag);
 
-    LOG_WARNING(Service_BOSS, "output_flag={}", output_flag);
+    LOG_WARNING(Service_BOSS, "output_flag={}", boss->output_flag);
 }
 
 void Module::Interface::RegisterTask(Kernel::HLERequestContext& ctx) {
@@ -131,12 +181,18 @@ void Module::Interface::RegisterTask(Kernel::HLERequestContext& ctx) {
     const u8 unk_param3 = rp.Pop<u8>();
     auto& buffer = rp.PopMappedBuffer();
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    online_service->RegisterTask(size, buffer);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#04X}, unk_param3={:#04X}",
-                size, unk_param2, unk_param3);
+    LOG_DEBUG(Service_BOSS, "called, size={:#010x}, unk_param2={:#04x}, unk_param3={:#04x}", size,
+              unk_param2, unk_param3);
 }
 
 void Module::Interface::UnregisterTask(Kernel::HLERequestContext& ctx) {
@@ -145,11 +201,17 @@ void Module::Interface::UnregisterTask(Kernel::HLERequestContext& ctx) {
     const u8 unk_param2 = rp.Pop<u8>();
     auto& buffer = rp.PopMappedBuffer();
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    const auto result = online_service->UnregisterTask(size, buffer);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
-    rb.Push(RESULT_SUCCESS);
+    rb.Push(result);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#04X}", size, unk_param2);
+    LOG_DEBUG(Service_BOSS, "called, size={:#010x}, unk_param2={:#04x}", size, unk_param2);
 }
 
 void Module::Interface::ReconfigureTask(Kernel::HLERequestContext& ctx) {
@@ -162,16 +224,22 @@ void Module::Interface::ReconfigureTask(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#04X}", size, unk_param2);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, unk_param2={:#04x}", size, unk_param2);
 }
 
 void Module::Interface::GetTaskIdList(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    online_service->GetTaskIdList();
+
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) called");
+    LOG_DEBUG(Service_BOSS, "called");
 }
 
 void Module::Interface::GetStepIdList(Kernel::HLERequestContext& ctx) {
@@ -183,7 +251,7 @@ void Module::Interface::GetStepIdList(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::GetNsDataIdList(Kernel::HLERequestContext& ctx) {
@@ -194,16 +262,22 @@ void Module::Interface::GetNsDataIdList(Kernel::HLERequestContext& ctx) {
     const u32 start_ns_data_id = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    const u16 entries_count = online_service->GetNsDataIdList(filter, max_entries, buffer);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(3, 2);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u16>(0); /// Actual number of output entries
-    rb.Push<u16>(0); /// Last word-index copied to output in the internal NsDataId list.
+    rb.Push<u16>(entries_count); /// Actual number of output entries
+    rb.Push<u16>(0);             /// Last word-index copied to output in the internal NsDataId list.
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS,
-                "(STUBBED) filter={:#010X}, max_entries={:#010X}, "
-                "word_index_start={:#06X}, start_ns_data_id={:#010X}",
-                filter, max_entries, word_index_start, start_ns_data_id);
+    LOG_DEBUG(Service_BOSS,
+              "filter={:#010x}, max_entries={:#010x}, "
+              "word_index_start={:#06x}, start_ns_data_id={:#010x}",
+              filter, max_entries, word_index_start, start_ns_data_id);
 }
 
 void Module::Interface::GetNsDataIdList1(Kernel::HLERequestContext& ctx) {
@@ -214,16 +288,22 @@ void Module::Interface::GetNsDataIdList1(Kernel::HLERequestContext& ctx) {
     const u32 start_ns_data_id = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    const u16 entries_count = online_service->GetNsDataIdList(filter, max_entries, buffer);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(3, 2);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u16>(0); /// Actual number of output entries
-    rb.Push<u16>(0); /// Last word-index copied to output in the internal NsDataId list.
+    rb.Push<u16>(entries_count); /// Actual number of output entries
+    rb.Push<u16>(0);             /// Last word-index copied to output in the internal NsDataId list.
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS,
-                "(STUBBED) filter={:#010X}, max_entries={:#010X}, "
-                "word_index_start={:#06X}, start_ns_data_id={:#010X}",
-                filter, max_entries, word_index_start, start_ns_data_id);
+    LOG_DEBUG(Service_BOSS,
+              "filter={:#010x}, max_entries={:#010x}, "
+              "word_index_start={:#06x}, start_ns_data_id={:#010x}",
+              filter, max_entries, word_index_start, start_ns_data_id);
 }
 
 void Module::Interface::GetNsDataIdList2(Kernel::HLERequestContext& ctx) {
@@ -234,16 +314,22 @@ void Module::Interface::GetNsDataIdList2(Kernel::HLERequestContext& ctx) {
     const u32 start_ns_data_id = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    const u16 entries_count = online_service->GetNsDataIdList(filter, max_entries, buffer);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(3, 2);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u16>(0); /// Actual number of output entries
-    rb.Push<u16>(0); /// Last word-index copied to output in the internal NsDataId list.
+    rb.Push<u16>(entries_count); /// Actual number of output entries
+    rb.Push<u16>(0);             /// Last word-index copied to output in the internal NsDataId list.
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS,
-                "(STUBBED) filter={:#010X}, max_entries={:#010X}, "
-                "word_index_start={:#06X}, start_ns_data_id={:#010X}",
-                filter, max_entries, word_index_start, start_ns_data_id);
+    LOG_DEBUG(Service_BOSS,
+              "filter={:#010x}, max_entries={:#010x}, "
+              "word_index_start={:#06x}, start_ns_data_id={:#010x}",
+              filter, max_entries, word_index_start, start_ns_data_id);
 }
 
 void Module::Interface::GetNsDataIdList3(Kernel::HLERequestContext& ctx) {
@@ -254,16 +340,22 @@ void Module::Interface::GetNsDataIdList3(Kernel::HLERequestContext& ctx) {
     const u32 start_ns_data_id = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    const u16 entries_count = online_service->GetNsDataIdList(filter, max_entries, buffer);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(3, 2);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u16>(0); /// Actual number of output entries
-    rb.Push<u16>(0); /// Last word-index copied to output in the internal NsDataId list.
+    rb.Push<u16>(entries_count); /// Actual number of output entries
+    rb.Push<u16>(0);             /// Last word-index copied to output in the internal NsDataId list.
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS,
-                "(STUBBED) filter={:#010X}, max_entries={:#010X}, "
-                "word_index_start={:#06X}, start_ns_data_id={:#010X}",
-                filter, max_entries, word_index_start, start_ns_data_id);
+    LOG_DEBUG(Service_BOSS,
+              "filter={:#010x}, max_entries={:#010x}, "
+              "word_index_start={:#06x}, start_ns_data_id={:#010x}",
+              filter, max_entries, word_index_start, start_ns_data_id);
 }
 
 void Module::Interface::SendProperty(Kernel::HLERequestContext& ctx) {
@@ -272,11 +364,17 @@ void Module::Interface::SendProperty(Kernel::HLERequestContext& ctx) {
     const u32 size = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    const auto result = online_service->SendProperty(property_id, size, buffer);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
-    rb.Push(RESULT_SUCCESS);
+    rb.Push(result);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) property_id={:#06X}, size={:#010X}", property_id, size);
+    LOG_DEBUG(Service_BOSS, "property_id={:#06x}, size={:#010x}", property_id, size);
 }
 
 void Module::Interface::SendPropertyHandle(Kernel::HLERequestContext& ctx) {
@@ -287,7 +385,7 @@ void Module::Interface::SendPropertyHandle(Kernel::HLERequestContext& ctx) {
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) property_id={:#06X}", property_id);
+    LOG_WARNING(Service_BOSS, "(STUBBED) property_id={:#06x}", property_id);
 }
 
 void Module::Interface::ReceiveProperty(Kernel::HLERequestContext& ctx) {
@@ -296,12 +394,18 @@ void Module::Interface::ReceiveProperty(Kernel::HLERequestContext& ctx) {
     const u32 size = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    const auto online_service = GetSessionService(ctx);
+    if (online_service == nullptr) {
+        return;
+    }
+    const auto result = online_service->ReceiveProperty(property_id, size, buffer);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 2);
-    rb.Push(RESULT_SUCCESS);
-    rb.Push<u32>(size); /// Should be actual read size
+    rb.Push(result);
+    rb.Push<u32>(size);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) property_id={:#06X}, size={:#010X}", property_id, size);
+    LOG_DEBUG(Service_BOSS, "property_id={:#06x}, size={:#010x}", property_id, size);
 }
 
 void Module::Interface::UpdateTaskInterval(Kernel::HLERequestContext& ctx) {
@@ -314,7 +418,7 @@ void Module::Interface::UpdateTaskInterval(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#06X}", size, unk_param2);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, unk_param2={:#06x}", size, unk_param2);
 }
 
 void Module::Interface::UpdateTaskCount(Kernel::HLERequestContext& ctx) {
@@ -323,11 +427,15 @@ void Module::Interface::UpdateTaskCount(Kernel::HLERequestContext& ctx) {
     const u32 unk_param2 = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    std::string task_id(size, 0);
+    buffer.Read(task_id.data(), 0, size);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#010X}", size, unk_param2);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, unk_param2={:#010x}, task_id={}", size,
+                unk_param2, task_id);
 }
 
 void Module::Interface::GetTaskInterval(Kernel::HLERequestContext& ctx) {
@@ -340,7 +448,7 @@ void Module::Interface::GetTaskInterval(Kernel::HLERequestContext& ctx) {
     rb.Push<u32>(0); // stub 0 ( 32bit value)
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::GetTaskCount(Kernel::HLERequestContext& ctx) {
@@ -348,12 +456,15 @@ void Module::Interface::GetTaskCount(Kernel::HLERequestContext& ctx) {
     const u32 size = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    std::string task_id(size, 0);
+    buffer.Read(task_id.data(), 0, size);
+
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 2);
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0); // stub 0 ( 32bit value)
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, task_id={}", size, task_id);
 }
 
 void Module::Interface::GetTaskServiceStatus(Kernel::HLERequestContext& ctx) {
@@ -361,12 +472,16 @@ void Module::Interface::GetTaskServiceStatus(Kernel::HLERequestContext& ctx) {
     const u32 size = rp.Pop<u32>();
     auto& buffer = rp.PopMappedBuffer();
 
+    // Not sure what this is but it's not the task status. Maybe it's the status of the service
+    // after running the task?
+    constexpr u8 task_service_status = 1;
+
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 2);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u8>(0); // stub 0 ( 8bit value)
+    rb.Push<u8>(task_service_status);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::StartTask(Kernel::HLERequestContext& ctx) {
@@ -378,7 +493,7 @@ void Module::Interface::StartTask(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::StartTaskImmediate(Kernel::HLERequestContext& ctx) {
@@ -390,7 +505,7 @@ void Module::Interface::StartTaskImmediate(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::CancelTask(Kernel::HLERequestContext& ctx) {
@@ -402,7 +517,7 @@ void Module::Interface::CancelTask(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::GetTaskFinishHandle(Kernel::HLERequestContext& ctx) {
@@ -428,7 +543,7 @@ void Module::Interface::GetTaskState(Kernel::HLERequestContext& ctx) {
     rb.Push<u8>(0);  /// unknown, usually 0
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, state={:#06X}", size, state);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, state={:#06x}", size, state);
 }
 
 void Module::Interface::GetTaskResult(Kernel::HLERequestContext& ctx) {
@@ -443,7 +558,7 @@ void Module::Interface::GetTaskResult(Kernel::HLERequestContext& ctx) {
     rb.Push<u8>(0);  // stub 0 (8 bit value)
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::GetTaskCommErrorCode(Kernel::HLERequestContext& ctx) {
@@ -458,7 +573,7 @@ void Module::Interface::GetTaskCommErrorCode(Kernel::HLERequestContext& ctx) {
     rb.Push<u8>(0);  // stub 0 (8 bit value)
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::GetTaskStatus(Kernel::HLERequestContext& ctx) {
@@ -473,7 +588,7 @@ void Module::Interface::GetTaskStatus(Kernel::HLERequestContext& ctx) {
     rb.Push<u8>(0); // stub 0 (8 bit value)
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#04X}, unk_param3={:#04X}",
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, unk_param2={:#04x}, unk_param3={:#04x}",
                 size, unk_param2, unk_param3);
 }
 
@@ -488,7 +603,7 @@ void Module::Interface::GetTaskError(Kernel::HLERequestContext& ctx) {
     rb.Push<u8>(0); // stub 0 (8 bit value)
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#04X}", size, unk_param2);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, unk_param2={:#04x}", size, unk_param2);
 }
 
 void Module::Interface::GetTaskInfo(Kernel::HLERequestContext& ctx) {
@@ -501,7 +616,7 @@ void Module::Interface::GetTaskInfo(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#04X}", size, unk_param2);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, unk_param2={:#04x}", size, unk_param2);
 }
 
 void Module::Interface::DeleteNsData(Kernel::HLERequestContext& ctx) {
@@ -511,7 +626,7 @@ void Module::Interface::DeleteNsData(Kernel::HLERequestContext& ctx) {
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) ns_data_id={:#010X}", ns_data_id);
+    LOG_WARNING(Service_BOSS, "(STUBBED) ns_data_id={:#010x}", ns_data_id);
 }
 
 void Module::Interface::GetNsDataHeaderInfo(Kernel::HLERequestContext& ctx) {
@@ -525,7 +640,7 @@ void Module::Interface::GetNsDataHeaderInfo(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) ns_data_id={:#010X}, type={:#04X}, size={:#010X}",
+    LOG_WARNING(Service_BOSS, "(STUBBED) ns_data_id={:#010x}, type={:#04x}, size={:#010x}",
                 ns_data_id, type, size);
 }
 
@@ -542,7 +657,7 @@ void Module::Interface::ReadNsData(Kernel::HLERequestContext& ctx) {
     rb.Push<u32>(0);    /// unknown
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) ns_data_id={:#010X}, offset={:#018X}, size={:#010X}",
+    LOG_WARNING(Service_BOSS, "(STUBBED) ns_data_id={:#010x}, offset={:#018x}, size={:#010x}",
                 ns_data_id, offset, size);
 }
 
@@ -554,7 +669,7 @@ void Module::Interface::SetNsDataAdditionalInfo(Kernel::HLERequestContext& ctx)
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010X}, unk_param2={:#010X}", unk_param1,
+    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010x}, unk_param2={:#010x}", unk_param1,
                 unk_param2);
 }
 
@@ -566,19 +681,19 @@ void Module::Interface::GetNsDataAdditionalInfo(Kernel::HLERequestContext& ctx)
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0); // stub 0 (32bit value)
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010X}", unk_param1);
+    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010x}", unk_param1);
 }
 
 void Module::Interface::SetNsDataNewFlag(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
     const u32 unk_param1 = rp.Pop<u32>();
-    ns_data_new_flag = rp.Pop<u8>();
+    boss->ns_data_new_flag = rp.Pop<u8>();
 
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010X}, ns_data_new_flag={:#04X}", unk_param1,
-                ns_data_new_flag);
+    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010x}, ns_data_new_flag={:#04x}", unk_param1,
+                boss->ns_data_new_flag);
 }
 
 void Module::Interface::GetNsDataNewFlag(Kernel::HLERequestContext& ctx) {
@@ -587,10 +702,10 @@ void Module::Interface::GetNsDataNewFlag(Kernel::HLERequestContext& ctx) {
 
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u8>(ns_data_new_flag);
+    rb.Push<u8>(boss->ns_data_new_flag);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010X}, ns_data_new_flag={:#04X}", unk_param1,
-                ns_data_new_flag);
+    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010x}, ns_data_new_flag={:#04x}", unk_param1,
+                boss->ns_data_new_flag);
 }
 
 void Module::Interface::GetNsDataLastUpdate(Kernel::HLERequestContext& ctx) {
@@ -602,7 +717,7 @@ void Module::Interface::GetNsDataLastUpdate(Kernel::HLERequestContext& ctx) {
     rb.Push<u32>(0); // stub 0 (32bit value)
     rb.Push<u32>(0); // stub 0 (32bit value)
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010X}", unk_param1);
+    LOG_WARNING(Service_BOSS, "(STUBBED) unk_param1={:#010x}", unk_param1);
 }
 
 void Module::Interface::GetErrorCode(Kernel::HLERequestContext& ctx) {
@@ -613,7 +728,7 @@ void Module::Interface::GetErrorCode(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0); /// output value
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) input={:#010X}", input);
+    LOG_WARNING(Service_BOSS, "(STUBBED) input={:#010x}", input);
 }
 
 void Module::Interface::RegisterStorageEntry(Kernel::HLERequestContext& ctx) {
@@ -628,8 +743,8 @@ void Module::Interface::RegisterStorageEntry(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
 
     LOG_WARNING(Service_BOSS,
-                "(STUBBED)  unk_param1={:#010X}, unk_param2={:#010X}, unk_param3={:#010X}, "
-                "unk_param4={:#010X}, unk_param5={:#04X}",
+                "(STUBBED)  unk_param1={:#010x}, unk_param2={:#010x}, unk_param3={:#010x}, "
+                "unk_param4={:#010x}, unk_param5={:#04x}",
                 unk_param1, unk_param2, unk_param3, unk_param4, unk_param5);
 }
 
@@ -655,8 +770,8 @@ void Module::Interface::SetStorageOption(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
 
     LOG_WARNING(Service_BOSS,
-                "(STUBBED)  unk_param1={:#04X}, unk_param2={:#010X}, "
-                "unk_param3={:#08X}, unk_param4={:#08X}",
+                "(STUBBED)  unk_param1={:#04x}, unk_param2={:#010x}, "
+                "unk_param3={:#08x}, unk_param4={:#08x}",
                 unk_param1, unk_param2, unk_param3, unk_param4);
 }
 
@@ -682,7 +797,7 @@ void Module::Interface::StartBgImmediate(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::GetTaskProperty0(Kernel::HLERequestContext& ctx) {
@@ -695,7 +810,7 @@ void Module::Interface::GetTaskProperty0(Kernel::HLERequestContext& ctx) {
     rb.Push<u8>(0); /// current state of PropertyID 0x0 stub 0 (8bit value)
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}", size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}", size);
 }
 
 void Module::Interface::RegisterImmediateTask(Kernel::HLERequestContext& ctx) {
@@ -709,7 +824,7 @@ void Module::Interface::RegisterImmediateTask(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010X}, unk_param2={:#04X}, unk_param3={:#04X}",
+    LOG_WARNING(Service_BOSS, "(STUBBED) size={:#010x}, unk_param2={:#04x}, unk_param3={:#04x}",
                 size, unk_param2, unk_param3);
 }
 
@@ -725,7 +840,7 @@ void Module::Interface::SetTaskQuery(Kernel::HLERequestContext& ctx) {
     rb.PushMappedBuffer(buffer1);
     rb.PushMappedBuffer(buffer2);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) buffer1_size={:#010X}, buffer2_size={:#010X}",
+    LOG_WARNING(Service_BOSS, "(STUBBED) buffer1_size={:#010x}, buffer2_size={:#010x}",
                 buffer1_size, buffer2_size);
 }
 
@@ -741,7 +856,7 @@ void Module::Interface::GetTaskQuery(Kernel::HLERequestContext& ctx) {
     rb.PushMappedBuffer(buffer1);
     rb.PushMappedBuffer(buffer2);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) buffer1_size={:#010X}, buffer2_size={:#010X}",
+    LOG_WARNING(Service_BOSS, "(STUBBED) buffer1_size={:#010x}, buffer2_size={:#010x}",
                 buffer1_size, buffer2_size);
 }
 
@@ -753,7 +868,7 @@ void Module::Interface::InitializeSessionPrivileged(Kernel::HLERequestContext& c
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) programID={:#018X}", programID);
+    LOG_WARNING(Service_BOSS, "(STUBBED) programID={:#018x}", programID);
 }
 
 void Module::Interface::GetAppNewFlag(Kernel::HLERequestContext& ctx) {
@@ -764,7 +879,7 @@ void Module::Interface::GetAppNewFlag(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.Push<u8>(0); // 0 = nothing new, 1 = new content
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) programID={:#018X}", programID);
+    LOG_WARNING(Service_BOSS, "(STUBBED) programID={:#018x}", programID);
 }
 
 void Module::Interface::GetNsDataIdListPrivileged(Kernel::HLERequestContext& ctx) {
@@ -783,8 +898,8 @@ void Module::Interface::GetNsDataIdListPrivileged(Kernel::HLERequestContext& ctx
     rb.PushMappedBuffer(buffer);
 
     LOG_WARNING(Service_BOSS,
-                "(STUBBED) programID={:#018X}, filter={:#010X}, max_entries={:#010X}, "
-                "word_index_start={:#06X}, start_ns_data_id={:#010X}",
+                "(STUBBED) programID={:#018x}, filter={:#010x}, max_entries={:#010x}, "
+                "word_index_start={:#06x}, start_ns_data_id={:#010x}",
                 programID, filter, max_entries, word_index_start, start_ns_data_id);
 }
 
@@ -804,8 +919,8 @@ void Module::Interface::GetNsDataIdListPrivileged1(Kernel::HLERequestContext& ct
     rb.PushMappedBuffer(buffer);
 
     LOG_WARNING(Service_BOSS,
-                "(STUBBED) programID={:#018X}, filter={:#010X}, max_entries={:#010X}, "
-                "word_index_start={:#06X}, start_ns_data_id={:#010X}",
+                "(STUBBED) programID={:#018x}, filter={:#010x}, max_entries={:#010x}, "
+                "word_index_start={:#06x}, start_ns_data_id={:#010x}",
                 programID, filter, max_entries, word_index_start, start_ns_data_id);
 }
 
@@ -819,7 +934,7 @@ void Module::Interface::SendPropertyPrivileged(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) property_id={:#06X}, size={:#010X}", property_id, size);
+    LOG_WARNING(Service_BOSS, "(STUBBED) property_id={:#06x}, size={:#010x}", property_id, size);
 }
 
 void Module::Interface::DeleteNsDataPrivileged(Kernel::HLERequestContext& ctx) {
@@ -830,7 +945,7 @@ void Module::Interface::DeleteNsDataPrivileged(Kernel::HLERequestContext& ctx) {
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
-    LOG_WARNING(Service_BOSS, "(STUBBED) programID={:#018X}, ns_data_id={:#010X}", programID,
+    LOG_WARNING(Service_BOSS, "(STUBBED) programID={:#018x}, ns_data_id={:#010x}", programID,
                 ns_data_id);
 }
 
@@ -847,7 +962,7 @@ void Module::Interface::GetNsDataHeaderInfoPrivileged(Kernel::HLERequestContext&
     rb.PushMappedBuffer(buffer);
 
     LOG_WARNING(Service_BOSS,
-                "(STUBBED) programID={:#018X} ns_data_id={:#010X}, type={:#04X}, size={:#010X}",
+                "(STUBBED) programID={:#018x} ns_data_id={:#010x}, type={:#04x}, size={:#010x}",
                 programID, ns_data_id, type, size);
 }
 
@@ -866,7 +981,7 @@ void Module::Interface::ReadNsDataPrivileged(Kernel::HLERequestContext& ctx) {
     rb.PushMappedBuffer(buffer);
 
     LOG_WARNING(Service_BOSS,
-                "(STUBBED) programID={:#018X}, ns_data_id={:#010X}, offset={:#018X}, size={:#010X}",
+                "(STUBBED) programID={:#018x}, ns_data_id={:#010x}, offset={:#018x}, size={:#010x}",
                 programID, ns_data_id, offset, size);
 }
 
@@ -874,15 +989,15 @@ void Module::Interface::SetNsDataNewFlagPrivileged(Kernel::HLERequestContext& ct
     IPC::RequestParser rp(ctx);
     const u64 programID = rp.Pop<u64>();
     const u32 unk_param1 = rp.Pop<u32>();
-    ns_data_new_flag_privileged = rp.Pop<u8>();
+    boss->ns_data_new_flag_privileged = rp.Pop<u8>();
 
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
 
     LOG_WARNING(
         Service_BOSS,
-        "(STUBBED) programID={:#018X}, unk_param1={:#010X}, ns_data_new_flag_privileged={:#04X}",
-        programID, unk_param1, ns_data_new_flag_privileged);
+        "(STUBBED) programID={:#018x}, unk_param1={:#010x}, ns_data_new_flag_privileged={:#04x}",
+        programID, unk_param1, boss->ns_data_new_flag_privileged);
 }
 
 void Module::Interface::GetNsDataNewFlagPrivileged(Kernel::HLERequestContext& ctx) {
@@ -892,18 +1007,18 @@ void Module::Interface::GetNsDataNewFlagPrivileged(Kernel::HLERequestContext& ct
 
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u8>(ns_data_new_flag_privileged);
+    rb.Push<u8>(boss->ns_data_new_flag_privileged);
 
     LOG_WARNING(
         Service_BOSS,
-        "(STUBBED) programID={:#018X}, unk_param1={:#010X}, ns_data_new_flag_privileged={:#04X}",
-        programID, unk_param1, ns_data_new_flag_privileged);
+        "(STUBBED) programID={:#018x}, unk_param1={:#010x}, ns_data_new_flag_privileged={:#04x}",
+        programID, unk_param1, boss->ns_data_new_flag_privileged);
 }
 
 Module::Interface::Interface(std::shared_ptr<Module> boss, const char* name, u32 max_session)
     : ServiceFramework(name, max_session), boss(std::move(boss)) {}
 
-Module::Module(Core::System& system) {
+Module::Module(Core::System& system_) : system(system_) {
     using namespace Kernel;
     // TODO: verify ResetType
     task_finish_event =
diff --git a/src/core/hle/service/boss/boss.h b/src/core/hle/service/boss/boss.h
index fd4ee7ebb..583f84aba 100644
--- a/src/core/hle/service/boss/boss.h
+++ b/src/core/hle/service/boss/boss.h
@@ -5,10 +5,11 @@
 #pragma once
 
 #include <memory>
-#include <boost/serialization/shared_ptr.hpp>
+#include <boost/serialization/export.hpp>
 #include "core/global.h"
 #include "core/hle/kernel/event.h"
 #include "core/hle/kernel/resource_limit.h"
+#include "core/hle/service/boss/online_service.h"
 #include "core/hle/service/service.h"
 
 namespace Core {
@@ -19,10 +20,19 @@ namespace Service::BOSS {
 
 class Module final {
 public:
-    explicit Module(Core::System& system);
+    explicit Module(Core::System& system_);
     ~Module() = default;
 
-    class Interface : public ServiceFramework<Interface> {
+    struct SessionData : public Kernel::SessionRequestHandler::SessionDataBase {
+        std::shared_ptr<OnlineService> online_service{};
+
+    private:
+        template <class Archive>
+        void serialize(Archive& ar, const unsigned int);
+        friend class boost::serialization::access;
+    };
+
+    class Interface : public ServiceFramework<Interface, SessionData> {
     public:
         Interface(std::shared_ptr<Module> boss, const char* name, u32 max_session);
         ~Interface() = default;
@@ -958,29 +968,20 @@ public:
     protected:
         std::shared_ptr<Module> boss;
 
-    private:
-        u8 new_arrival_flag;
-        u8 ns_data_new_flag;
-        u8 ns_data_new_flag_privileged;
-        u8 output_flag;
-
-        template <class Archive>
-        void serialize(Archive& ar, const unsigned int) {
-            ar& new_arrival_flag;
-            ar& ns_data_new_flag;
-            ar& ns_data_new_flag_privileged;
-            ar& output_flag;
-        }
-        friend class boost::serialization::access;
+        std::shared_ptr<OnlineService> GetSessionService(Kernel::HLERequestContext& ctx);
     };
 
 private:
+    Core::System& system;
     std::shared_ptr<Kernel::Event> task_finish_event;
 
+    u8 new_arrival_flag;
+    u8 ns_data_new_flag;
+    u8 ns_data_new_flag_privileged;
+    u8 output_flag;
+
     template <class Archive>
-    void serialize(Archive& ar, const unsigned int) {
-        ar& task_finish_event;
-    }
+    void serialize(Archive& ar, const unsigned int);
     friend class boost::serialization::access;
 };
 
@@ -988,9 +989,6 @@ void InstallInterfaces(Core::System& system);
 
 } // namespace Service::BOSS
 
-namespace boost::serialization {
-template <class Archive>
-void load_construct_data(Archive& ar, Service::BOSS::Module* t, const unsigned int) {
-    ::new (t) Service::BOSS::Module(Core::Global<Core::System>());
-}
-} // namespace boost::serialization
+SERVICE_CONSTRUCT(Service::BOSS::Module)
+BOOST_CLASS_EXPORT_KEY(Service::BOSS::Module)
+BOOST_CLASS_EXPORT_KEY(Service::BOSS::Module::SessionData)
diff --git a/src/core/hle/service/boss/online_service.cpp b/src/core/hle/service/boss/online_service.cpp
new file mode 100644
index 000000000..6a1497521
--- /dev/null
+++ b/src/core/hle/service/boss/online_service.cpp
@@ -0,0 +1,400 @@
+// Copyright 2023 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <boost/serialization/map.hpp>
+#include "common/archives.h"
+#include "common/file_util.h"
+#include "common/serialization/boost_std_variant.hpp"
+#include "common/string_util.h"
+#include "core/core.h"
+#include "core/file_sys/archive_backend.h"
+#include "core/file_sys/archive_extsavedata.h"
+#include "core/file_sys/archive_systemsavedata.h"
+#include "core/file_sys/directory_backend.h"
+#include "core/file_sys/errors.h"
+#include "core/file_sys/file_backend.h"
+#include "core/hle/kernel/hle_ipc.h"
+#include "core/hle/service/boss/online_service.h"
+
+namespace Service::BOSS {
+
+OnlineService::OnlineService(u64 program_id_, u64 extdata_id_)
+    : program_id(program_id_), extdata_id(extdata_id_) {}
+
+template <class Archive>
+void OnlineService::serialize(Archive& ar, const unsigned int) {
+    ar& current_props;
+    ar& task_id_list;
+    ar& program_id;
+    ar& extdata_id;
+}
+SERIALIZE_IMPL(OnlineService)
+
+template <class Archive>
+void BossTaskProperties::serialize(Archive& ar, const unsigned int) {
+    ar& task_result;
+    ar& properties;
+}
+SERIALIZE_IMPL(BossTaskProperties)
+
+ResultCode OnlineService::InitializeSession(u64 init_program_id) {
+    // The BOSS service uses three databases:
+    // BOSS_A: Archive? A list of program ids and some properties that are keyed on program
+    // BOSS_SS: Saved Strings? Includes the url and the other string properties, and also some other
+    // properties?, keyed on task_id
+    // BOSS_SV: Saved Values? Includes task id and most properties keyed on task_id
+
+    // It saves data in its databases in the following format:
+    // A four byte header (always 00 80 34 12?) followed by any number of 0x800(BOSS_A) and
+    // 0xC00(BOSS_SS and BOSS_SV) entries.
+
+    current_props = BossTaskProperties();
+
+    if (init_program_id == 0) {
+        init_program_id = program_id;
+    }
+
+    const std::string& nand_directory = FileUtil::GetUserPath(FileUtil::UserPath::NANDDir);
+    FileSys::ArchiveFactory_SystemSaveData systemsavedata_factory(nand_directory);
+
+    // Open the SystemSaveData archive 0x00010034
+    const FileSys::Path archive_path(boss_system_savedata_id);
+    auto archive_result = systemsavedata_factory.Open(archive_path, 0);
+
+    std::unique_ptr<FileSys::ArchiveBackend> boss_system_save_data_archive;
+    if (archive_result.Succeeded()) {
+        boss_system_save_data_archive = std::move(archive_result).Unwrap();
+    } else if (archive_result.Code() == FileSys::ERROR_NOT_FOUND) {
+        // If the archive didn't exist, create the files inside
+        systemsavedata_factory.Format(archive_path, FileSys::ArchiveFormatInfo(), 0);
+
+        // Open it again to get a valid archive now that the folder exists
+        auto create_archive_result = systemsavedata_factory.Open(archive_path, 0);
+        if (!create_archive_result.Succeeded()) {
+            LOG_ERROR(Service_BOSS, "Could not open BOSS savedata");
+            return ResultCode(1);
+        }
+        boss_system_save_data_archive = std::move(create_archive_result).Unwrap();
+    } else {
+        LOG_ERROR(Service_BOSS, "Could not open BOSS savedata");
+        return ResultCode(1);
+    }
+
+    FileSys::Mode open_mode = {};
+    open_mode.read_flag.Assign(1);
+
+    // TODO: Read data from BOSS_A.db
+
+    auto boss_sv_result =
+        boss_system_save_data_archive->OpenFile(FileSys::Path("/BOSS_SV.db"), open_mode);
+    auto boss_ss_result =
+        boss_system_save_data_archive->OpenFile(FileSys::Path("/BOSS_SS.db"), open_mode);
+    if (!boss_sv_result.Succeeded() || !boss_ss_result.Succeeded()) {
+        LOG_ERROR(Service_BOSS, "Could not open BOSS database.");
+        return RESULT_SUCCESS;
+    }
+
+    auto boss_sv = std::move(boss_sv_result).Unwrap();
+    auto boss_ss = std::move(boss_ss_result).Unwrap();
+    if (!(boss_sv->GetSize() > BOSS_SAVE_HEADER_SIZE &&
+          ((boss_sv->GetSize() - BOSS_SAVE_HEADER_SIZE) % BOSS_S_ENTRY_SIZE) == 0 &&
+          boss_sv->GetSize() == boss_ss->GetSize())) {
+        LOG_ERROR(Service_BOSS, "BOSS database has incorrect size.");
+        return RESULT_SUCCESS;
+    }
+
+    // Read the files if they already exist
+    const u64 num_entries = (boss_sv->GetSize() - BOSS_SAVE_HEADER_SIZE) / BOSS_S_ENTRY_SIZE;
+    for (u64 i = 0; i < num_entries; i++) {
+        const u64 entry_offset = i * BOSS_S_ENTRY_SIZE + BOSS_SAVE_HEADER_SIZE;
+
+        BossSVData sv_data;
+        boss_sv->Read(entry_offset, sizeof(BossSVData), reinterpret_cast<u8*>(&sv_data));
+
+        BossSSData ss_data;
+        boss_ss->Read(entry_offset, sizeof(BossSSData), reinterpret_cast<u8*>(&ss_data));
+
+        if (sv_data.program_id != init_program_id) {
+            continue;
+        }
+
+        std::vector<u8> url_vector(URL_SIZE);
+        std::memcpy(url_vector.data(), ss_data.url.data(), URL_SIZE);
+        current_props.properties[PropertyID::Url] = url_vector;
+
+        const auto task_id = std::string(sv_data.task_id.data());
+        if (task_id_list.contains(task_id)) {
+            LOG_WARNING(Service_BOSS, "TaskId already in list, will be replaced");
+            task_id_list.erase(task_id);
+        }
+
+        task_id_list.emplace(task_id, std::move(current_props));
+        current_props = BossTaskProperties();
+    }
+
+    return RESULT_SUCCESS;
+}
+
+void OnlineService::RegisterTask(const u32 size, Kernel::MappedBuffer& buffer) {
+    std::string task_id(size, 0);
+    buffer.Read(task_id.data(), 0, size);
+
+    if (task_id_list.contains(task_id)) {
+        LOG_WARNING(Service_BOSS, "TaskId already in list, will be replaced");
+        task_id_list.erase(task_id);
+    }
+    task_id_list.emplace(task_id, std::move(current_props));
+    current_props = BossTaskProperties();
+}
+
+ResultCode OnlineService::UnregisterTask(const u32 size, Kernel::MappedBuffer& buffer) {
+    if (size > TASK_ID_SIZE) {
+        LOG_WARNING(Service_BOSS, "TaskId cannot be longer than 8");
+        return ResultCode(1);
+    }
+
+    std::string task_id(size, 0);
+    buffer.Read(task_id.data(), 0, size);
+    if (task_id_list.erase(task_id) == 0) {
+        LOG_WARNING(Service_BOSS, "TaskId not in list");
+        return ResultCode(1);
+    }
+
+    return RESULT_SUCCESS;
+}
+
+void OnlineService::GetTaskIdList() {
+    current_props.properties[PropertyID::TotalTasks] = static_cast<u16>(task_id_list.size());
+
+    const auto num_task_ids = TASKIDLIST_SIZE / TASK_ID_SIZE;
+    std::vector<std::array<u8, TASK_ID_SIZE>> task_ids(num_task_ids);
+
+    u16 num_returned_task_ids = 0;
+    for (const auto& iter : task_id_list) {
+        const std::string current_task_id = iter.first;
+        if (current_task_id.size() > TASK_ID_SIZE || num_returned_task_ids >= num_task_ids) {
+            LOG_WARNING(Service_BOSS, "TaskId {} too long or too many TaskIds", current_task_id);
+            continue;
+        }
+        std::memcpy(task_ids[num_returned_task_ids++].data(), current_task_id.data(), TASK_ID_SIZE);
+    }
+
+    auto* task_list_prop =
+        std::get_if<std::vector<u8>>(&current_props.properties[PropertyID::TaskIdList]);
+    if (task_list_prop && task_list_prop->size() == TASKIDLIST_SIZE) {
+        std::memcpy(task_list_prop->data(), task_ids.data(), TASKIDLIST_SIZE);
+    }
+}
+
+std::vector<FileSys::Entry> OnlineService::GetBossExtDataFiles() {
+    FileSys::ArchiveFactory_ExtSaveData boss_extdata_archive_factory(
+        FileUtil::GetUserPath(FileUtil::UserPath::SDMCDir), FileSys::ExtSaveDataType::Boss);
+    const FileSys::Path boss_path{GetBossDataDir()};
+    auto archive_result = boss_extdata_archive_factory.Open(boss_path, 0);
+    if (!archive_result.Succeeded()) {
+        LOG_WARNING(Service_BOSS, "Extdata opening failed");
+        return {};
+    }
+
+    auto boss_archive = std::move(archive_result).Unwrap();
+    auto dir_result = boss_archive->OpenDirectory("/");
+    if (!dir_result.Succeeded()) {
+        LOG_WARNING(Service_BOSS, "Extdata directory opening failed");
+        return {};
+    }
+    auto dir = std::move(dir_result).Unwrap();
+
+    // Keep reading the directory 32 files at a time until all files have been checked
+    std::vector<FileSys::Entry> boss_files;
+    constexpr u32 files_to_read = 32;
+    u32 entry_count = 0;
+    std::size_t i = 0;
+    do {
+        boss_files.resize(boss_files.size() + files_to_read);
+        entry_count = dir->Read(files_to_read, boss_files.data() + (i++ * files_to_read));
+    } while (files_to_read <= entry_count);
+
+    boss_files.resize(i * files_to_read + entry_count);
+    return boss_files;
+}
+
+FileSys::Path OnlineService::GetBossDataDir() {
+    const u32 high = static_cast<u32>(extdata_id >> 32);
+    const u32 low = static_cast<u32>(extdata_id & 0xFFFFFFFF);
+    return FileSys::ConstructExtDataBinaryPath(1, high, low);
+}
+
+std::vector<NsDataEntry> OnlineService::GetNsDataEntries() {
+    FileSys::ArchiveFactory_ExtSaveData boss_extdata_archive_factory(
+        FileUtil::GetUserPath(FileUtil::UserPath::SDMCDir), FileSys::ExtSaveDataType::Boss);
+    const FileSys::Path boss_path{GetBossDataDir()};
+    auto archive_result = boss_extdata_archive_factory.Open(boss_path, 0);
+    if (!archive_result.Succeeded()) {
+        LOG_WARNING(Service_BOSS, "Extdata opening failed");
+        return {};
+    }
+    auto boss_archive = std::move(archive_result).Unwrap().get();
+
+    std::vector<NsDataEntry> ns_data;
+    std::vector<FileSys::Entry> boss_files = GetBossExtDataFiles();
+    for (const auto& current_file : boss_files) {
+        constexpr u32 boss_header_length = 0x34;
+        if (current_file.is_directory || current_file.file_size < boss_header_length) {
+            LOG_WARNING(Service_BOSS, "SpotPass extdata contains directory or file is too short");
+            continue;
+        }
+
+        FileSys::Mode mode{};
+        mode.read_flag.Assign(1);
+
+        NsDataEntry entry{.filename = Common::UTF16ToUTF8(current_file.filename)};
+        auto file_result = boss_archive->OpenFile("/" + entry.filename, mode);
+        if (!file_result.Succeeded()) {
+            LOG_WARNING(Service_BOSS, "Opening SpotPass file failed.");
+            continue;
+        }
+
+        auto file = std::move(file_result).Unwrap();
+        file->Read(0, boss_header_length, reinterpret_cast<u8*>(&entry.header));
+        if (entry.header.header_length != BOSS_EXTDATA_HEADER_LENGTH) {
+            LOG_WARNING(
+                Service_BOSS,
+                "Incorrect header length or non-SpotPass file; expected {:#010x}, found {:#010x}",
+                BOSS_EXTDATA_HEADER_LENGTH, entry.header.header_length);
+            continue;
+        }
+
+        if (entry.header.program_id != program_id) {
+            LOG_WARNING(Service_BOSS,
+                        "Mismatched program ID in SpotPass data. Was expecting "
+                        "{:#018x}, found {:#018x}",
+                        program_id, static_cast<u64>(entry.header.program_id));
+            continue;
+        }
+
+        // Check the payload size is correct, excluding header
+        if (entry.header.payload_size != (current_file.file_size - boss_header_length)) {
+            LOG_WARNING(Service_BOSS,
+                        "Mismatched file size, was expecting {:#010x}, found {:#010x}",
+                        static_cast<u32>(entry.header.payload_size),
+                        current_file.file_size - boss_header_length);
+            continue;
+        }
+
+        ns_data.push_back(entry);
+    }
+
+    return ns_data;
+}
+
+u16 OnlineService::GetNsDataIdList(const u32 filter, const u32 max_entries,
+                                   Kernel::MappedBuffer& buffer) {
+    std::vector<NsDataEntry> ns_data = GetNsDataEntries();
+    std::vector<u32> output_entries;
+    for (const auto& current_entry : ns_data) {
+        const u32 datatype_raw = static_cast<u32>(current_entry.header.datatype);
+        const u16 datatype_high = static_cast<u16>(datatype_raw >> 16);
+        const u16 datatype_low = static_cast<u16>(datatype_raw & 0xFFFF);
+        const u16 filter_high = static_cast<u16>(filter >> 16);
+        const u16 filter_low = static_cast<u16>(filter & 0xFFFF);
+        if (filter != 0xFFFFFFFF &&
+            (filter_high != datatype_high || (filter_low & datatype_low) == 0)) {
+            continue;
+        }
+
+        if (output_entries.size() >= max_entries) {
+            LOG_WARNING(Service_BOSS, "Reached maximum number of entries");
+            break;
+        }
+
+        output_entries.push_back(current_entry.header.ns_data_id);
+    }
+
+    buffer.Write(output_entries.data(), 0, sizeof(u32) * output_entries.size());
+    return static_cast<u16>(output_entries.size());
+}
+
+template <class... Ts>
+struct overload : Ts... {
+    using Ts::operator()...;
+};
+template <class... Ts>
+overload(Ts...) -> overload<Ts...>;
+
+ResultCode OnlineService::SendProperty(const u16 id, const u32 size, Kernel::MappedBuffer& buffer) {
+    const auto property_id = static_cast<PropertyID>(id);
+    if (!current_props.properties.contains(property_id)) {
+        LOG_ERROR(Service_BOSS, "Unknown property with id {:#06x}", property_id);
+        return ResultCode(1);
+    }
+
+    auto& prop = current_props.properties[property_id];
+    auto read_pod = [&]<typename T>(T& old_prop) {
+        static_assert(std::is_trivial<T>::value, "Only trivial types are allowed for read_pod");
+        if (size != sizeof(old_prop)) {
+            LOG_ERROR(Service_BOSS, "Unexpected size of property {:#06x}, was expecting {}, got {}",
+                      property_id, sizeof(old_prop), size);
+        }
+        T cur_prop = 0;
+        buffer.Read(&cur_prop, 0, size);
+        prop = cur_prop;
+    };
+
+    auto read_vector = [&]<typename T>(std::vector<T>& old_prop) {
+        if (size != old_prop.size()) {
+            LOG_ERROR(Service_BOSS, "Unexpected size of property {:#06x}, was expecting {}, got {}",
+                      property_id, old_prop.size(), size);
+        }
+        std::vector<T> cur_prop(size);
+        buffer.Read(cur_prop.data(), 0, size);
+        prop = cur_prop;
+    };
+
+    std::visit(overload{[&](u8& cur_prop) { read_pod(cur_prop); },
+                        [&](u16& cur_prop) { read_pod(cur_prop); },
+                        [&](u32& cur_prop) { read_pod(cur_prop); },
+                        [&](std::vector<u8>& cur_prop) { read_vector(cur_prop); },
+                        [&](std::vector<u32>& cur_prop) { read_vector(cur_prop); }},
+               prop);
+
+    return RESULT_SUCCESS;
+}
+
+ResultCode OnlineService::ReceiveProperty(const u16 id, const u32 size,
+                                          Kernel::MappedBuffer& buffer) {
+    const auto property_id = static_cast<PropertyID>(id);
+    if (!current_props.properties.contains(property_id)) {
+        LOG_ERROR(Service_BOSS, "Unknown property with id {:#06x}", property_id);
+        return ResultCode(1);
+    }
+
+    auto write_pod = [&]<typename T>(T& cur_prop) {
+        static_assert(std::is_trivial<T>::value, "Only trivial types are allowed for write_pod");
+        if (size != sizeof(cur_prop)) {
+            LOG_ERROR(Service_BOSS, "Unexpected size of property {:#06x}, was expecting {}, got {}",
+                      property_id, sizeof(cur_prop), size);
+        }
+        buffer.Write(&cur_prop, 0, size);
+    };
+
+    auto write_vector = [&]<typename T>(std::vector<T>& cur_prop) {
+        if (size != cur_prop.size()) {
+            LOG_ERROR(Service_BOSS, "Unexpected size of property {:#06x}, was expecting {}, got {}",
+                      property_id, cur_prop.size(), size);
+        }
+        buffer.Write(cur_prop.data(), 0, size);
+    };
+
+    auto& prop = current_props.properties[property_id];
+    std::visit(overload{[&](u8& cur_prop) { write_pod(cur_prop); },
+                        [&](u16& cur_prop) { write_pod(cur_prop); },
+                        [&](u32& cur_prop) { write_pod(cur_prop); },
+                        [&](std::vector<u8>& cur_prop) { write_vector(cur_prop); },
+                        [&](std::vector<u32>& cur_prop) { write_vector(cur_prop); }},
+               prop);
+
+    return RESULT_SUCCESS;
+}
+
+} // namespace Service::BOSS
diff --git a/src/core/hle/service/boss/online_service.h b/src/core/hle/service/boss/online_service.h
new file mode 100644
index 000000000..b059060cf
--- /dev/null
+++ b/src/core/hle/service/boss/online_service.h
@@ -0,0 +1,169 @@
+// Copyright 2023 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <variant>
+#include <vector>
+
+#include "common/common_types.h"
+#include "core/hle/result.h"
+#include "core/loader/loader.h"
+
+namespace Kernel {
+class MappedBuffer;
+}
+
+namespace FileSys {
+struct Entry;
+class Path;
+} // namespace FileSys
+
+namespace Service::BOSS {
+
+constexpr u32 BOSS_PAYLOAD_HEADER_LENGTH = 0x28;
+constexpr u32 BOSS_MAGIC = Loader::MakeMagic('b', 'o', 's', 's');
+constexpr u32 BOSS_PAYLOAD_MAGIC = 0x10001;
+constexpr u64 NEWS_PROG_ID = 0x0004013000003502;
+
+constexpr u32 BOSS_CONTENT_HEADER_LENGTH = 0x132;
+constexpr u32 BOSS_HEADER_WITH_HASH_LENGTH = 0x13C;
+constexpr u32 BOSS_ENTIRE_HEADER_LENGTH = BOSS_CONTENT_HEADER_LENGTH + BOSS_HEADER_WITH_HASH_LENGTH;
+constexpr u32 BOSS_EXTDATA_HEADER_LENGTH = 0x18;
+constexpr u32 BOSS_S_ENTRY_SIZE = 0xC00;
+constexpr u32 BOSS_SAVE_HEADER_SIZE = 4;
+
+constexpr size_t TASK_ID_SIZE = 8;
+constexpr size_t URL_SIZE = 0x200;
+constexpr size_t HEADERS_SIZE = 0x360;
+constexpr size_t CERTIDLIST_SIZE = 3;
+constexpr size_t TASKIDLIST_SIZE = 0x400;
+
+constexpr std::array<u8, 8> boss_system_savedata_id{
+    0x00, 0x00, 0x00, 0x00, 0x34, 0x00, 0x01, 0x00,
+};
+
+#pragma pack(push, 4)
+struct BossHeader {
+    u8 header_length;
+    std::array<u8, 11> zero1;
+    u32_be unknown;
+    u32_be download_date;
+    std::array<u8, 4> zero2;
+    u64_be program_id;
+    std::array<u8, 4> zero3;
+    u32_be datatype;
+    u32_be payload_size;
+    u32_be ns_data_id;
+    u32_be version;
+};
+#pragma pack(pop)
+static_assert(sizeof(BossHeader) == 0x34, "BossHeader has incorrect size");
+
+struct NsDataEntry {
+    std::string filename;
+    BossHeader header;
+};
+
+enum class PropertyID : u16 {
+    Interval = 0x03,
+    Duration = 0x04,
+    Url = 0x07,
+    Headers = 0x0D,
+    CertId = 0x0E,
+    CertIdList = 0x0F,
+    LoadCert = 0x10,
+    LoadRootCert = 0x11,
+    TotalTasks = 0x35,
+    TaskIdList = 0x36,
+};
+
+struct BossSVData {
+    INSERT_PADDING_BYTES(0x10);
+    u64 program_id;
+    std::array<char, TASK_ID_SIZE> task_id;
+};
+
+struct BossSSData {
+    INSERT_PADDING_BYTES(0x21C);
+    std::array<u8, URL_SIZE> url;
+};
+
+using BossTaskProperty = std::variant<u8, u16, u32, std::vector<u8>, std::vector<u32>>;
+struct BossTaskProperties {
+    bool task_result;
+    std::map<PropertyID, BossTaskProperty> properties{
+        {static_cast<PropertyID>(0x00), u8()},
+        {static_cast<PropertyID>(0x01), u8()},
+        {static_cast<PropertyID>(0x02), u32()},
+        {PropertyID::Interval, u32()},
+        {PropertyID::Duration, u32()},
+        {static_cast<PropertyID>(0x05), u8()},
+        {static_cast<PropertyID>(0x06), u8()},
+        {PropertyID::Url, std::vector<u8>(URL_SIZE)},
+        {static_cast<PropertyID>(0x08), u32()},
+        {static_cast<PropertyID>(0x09), u8()},
+        {static_cast<PropertyID>(0x0A), std::vector<u8>(0x100)},
+        {static_cast<PropertyID>(0x0B), std::vector<u8>(0x200)},
+        {static_cast<PropertyID>(0x0C), u32()},
+        {PropertyID::Headers, std::vector<u8>(HEADERS_SIZE)},
+        {PropertyID::CertId, u32()},
+        {PropertyID::CertIdList, std::vector<u32>(CERTIDLIST_SIZE)},
+        {PropertyID::LoadCert, u8()},
+        {PropertyID::LoadRootCert, u8()},
+        {static_cast<PropertyID>(0x12), u8()},
+        {static_cast<PropertyID>(0x13), u32()},
+        {static_cast<PropertyID>(0x14), u32()},
+        {static_cast<PropertyID>(0x15), std::vector<u8>(0x40)},
+        {static_cast<PropertyID>(0x16), u32()},
+        {static_cast<PropertyID>(0x18), u8()},
+        {static_cast<PropertyID>(0x19), u8()},
+        {static_cast<PropertyID>(0x1A), u8()},
+        {static_cast<PropertyID>(0x1B), u32()},
+        {static_cast<PropertyID>(0x1C), u32()},
+        {PropertyID::TotalTasks, u16()},
+        {PropertyID::TaskIdList, std::vector<u8>(TASKIDLIST_SIZE)},
+        {static_cast<PropertyID>(0x3B), u32()},
+        {static_cast<PropertyID>(0x3E), std::vector<u8>(0x200)},
+        {static_cast<PropertyID>(0x3F), u8()},
+    };
+
+    template <class Archive>
+    void serialize(Archive& ar, const unsigned int);
+    friend class boost::serialization::access;
+};
+
+class OnlineService final {
+public:
+    explicit OnlineService(u64 program_id_, u64 extdata_id_);
+
+    ResultCode InitializeSession(u64 init_program_id);
+    void RegisterTask(const u32 size, Kernel::MappedBuffer& buffer);
+    ResultCode UnregisterTask(const u32 size, Kernel::MappedBuffer& buffer);
+    void GetTaskIdList();
+    u16 GetNsDataIdList(const u32 filter, const u32 max_entries, Kernel::MappedBuffer& buffer);
+    ResultCode SendProperty(const u16 id, const u32 size, Kernel::MappedBuffer& buffer);
+    ResultCode ReceiveProperty(const u16 id, const u32 size, Kernel::MappedBuffer& buffer);
+
+private:
+    std::vector<FileSys::Entry> GetBossExtDataFiles();
+    FileSys::Path GetBossDataDir();
+    std::vector<NsDataEntry> GetNsDataEntries();
+
+    BossTaskProperties current_props;
+    std::map<std::string, BossTaskProperties> task_id_list;
+
+    u64 program_id;
+    u64 extdata_id;
+
+    // For serialization
+    explicit OnlineService() = default;
+
+    template <class Archive>
+    void serialize(Archive& ar, const unsigned int);
+    friend class boost::serialization::access;
+};
+
+} // namespace Service::BOSS