Atmosphere/stratosphere/ams_mitm/source/dns_mitm/dnsmitm_module.cpp

143 lines
5.1 KiB
C++

/*
* Copyright (c) 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_debug.hpp"
#include "dnsmitm_resolver_impl.hpp"
#include "dnsmitm_host_redirection.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;
};
alignas(os::MemoryPageSize) constinit u8 g_resolver_allocator_buffer[16_KB];
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);
}
}
}
bool ShouldMitmDns() {
u8 en = 0;
if (settings::fwdbg::GetSettingsItemValue(std::addressof(en), sizeof(en), "atmosphere", "enable_dns_mitm") == sizeof(en)) {
return (en != 0);
}
return false;
}
bool ShouldEnableDebugLog() {
u8 en = 0;
if (settings::fwdbg::GetSettingsItemValue(std::addressof(en), sizeof(en), "atmosphere", "enable_dns_mitm_debug_log") == sizeof(en)) {
return (en != 0);
}
return false;
}
}
void MitmModule::ThreadFunction(void *arg) {
/* Wait until initialization is complete. */
mitm::WaitInitialized();
/* If we shouldn't mitm dns, don't do anything at all. */
if (!ShouldMitmDns()) {
return;
}
/* Initialize the socket allocator. */
ams::socket::InitializeAllocatorForInternal(g_resolver_allocator_buffer, sizeof(g_resolver_allocator_buffer));
/* Initialize debug. */
resolver::InitializeDebug(ShouldEnableDebugLog());
/* Initialize redirection map. */
resolver::InitializeResolverRedirections();
/* Create mitm servers. */
R_ABORT_UNLESS((g_server_manager.RegisterMitmServer<ResolverImpl>(PortIndex_Mitm, DnsMitmServiceName)));
/* Loop forever, servicing our services. */
ProcessForServerOnAllThreads();
}
}