dns: skeleton passthrough mitm

stratosphere/ams_mitm/source/dns_mitm/dnsmitm_module.cpp

@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+#include "../amsmitm_initialization.hpp"
+#include "dnsmitm_module.hpp"
+#include "dnsmitm_resolver_impl.hpp"
+#include "dnsmitm_debug.hpp"
+
+namespace ams::mitm::socket::resolver {
+
+    namespace {
+
+        enum PortIndex {
+            PortIndex_Mitm,
+            PortIndex_Count,
+        };
+
+        constexpr sm::ServiceName DnsMitmServiceName = sm::ServiceName::Encode("sfdnsres");
+
+        constexpr size_t MaxSessions = 30;
+        using ServerOptions = sf::hipc::DefaultServerManagerOptions;
+
+        class ServerManager final : public sf::hipc::ServerManager<PortIndex_Count, ServerOptions, MaxSessions> {
+            private:
+                virtual Result OnNeedsToAccept(int port_index, Server *server) override;
+        };
+
+        ServerManager g_server_manager;
+
+        Result ServerManager::OnNeedsToAccept(int port_index, Server *server) {
+            /* Acknowledge the mitm session. */
+            std::shared_ptr<::Service> fsrv;
+            sm::MitmProcessInfo client_info;
+            server->AcknowledgeMitmSession(std::addressof(fsrv), std::addressof(client_info));
+
+            switch (port_index) {
+                case PortIndex_Mitm:
+                    return this->AcceptMitmImpl(server, sf::CreateSharedObjectEmplaced<IResolver, ResolverImpl>(decltype(fsrv)(fsrv), client_info), fsrv);
+                AMS_UNREACHABLE_DEFAULT_CASE();
+            }
+        }
+
+        constexpr size_t TotalThreads = 8;
+        static_assert(TotalThreads >= 1, "TotalThreads");
+        constexpr size_t NumExtraThreads = TotalThreads - 1;
+        constexpr size_t ThreadStackSize = mitm::ModuleTraits<socket::resolver::MitmModule>::StackSize;
+        alignas(os::MemoryPageSize) u8 g_extra_thread_stacks[NumExtraThreads][ThreadStackSize];
+
+        os::ThreadType g_extra_threads[NumExtraThreads];
+
+        void LoopServerThread(void *arg) {
+            /* Loop forever, servicing our services. */
+            g_server_manager.LoopProcess();
+        }
+
+        void ProcessForServerOnAllThreads() {
+            /* Initialize threads. */
+            if constexpr (NumExtraThreads > 0) {
+                const s32 priority = os::GetThreadCurrentPriority(os::GetCurrentThread());
+                for (size_t i = 0; i < NumExtraThreads; i++) {
+                    R_ABORT_UNLESS(os::CreateThread(g_extra_threads + i, LoopServerThread, nullptr, g_extra_thread_stacks[i], ThreadStackSize, priority));
+                }
+            }
+
+            /* Start extra threads. */
+            if constexpr (NumExtraThreads > 0) {
+                for (size_t i = 0; i < NumExtraThreads; i++) {
+                    os::StartThread(g_extra_threads + i);
+                }
+            }
+
+            /* Loop this thread. */
+            LoopServerThread(nullptr);
+
+            /* Wait for extra threads to finish. */
+            if constexpr (NumExtraThreads > 0) {
+                for (size_t i = 0; i < NumExtraThreads; i++) {
+                    os::WaitThread(g_extra_threads + i);
+                }
+            }
+        }
+
+    }
+
+    void MitmModule::ThreadFunction(void *arg) {
+        /* Wait until initialization is complete. */
+        mitm::WaitInitialized();
+
+        /* Initialize debug. */
+        resolver::InitializeDebug();
+
+        /* Create mitm servers. */
+        R_ABORT_UNLESS((g_server_manager.RegisterMitmServer<ResolverImpl>(PortIndex_Mitm, DnsMitmServiceName)));
+
+        /* Loop forever, servicing our services. */
+        ProcessForServerOnAllThreads();
+    }
+
+}