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422 lines
19 KiB
C++
422 lines
19 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "fsa/fs_mount_utils.hpp"
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namespace ams::fs {
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namespace {
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constinit os::SdkMutex g_mount_stratosphere_romfs_lock;
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constinit bool g_mounted_stratosphere_romfs = false;
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constinit util::TypedStorage<FileHandleStorage> g_stratosphere_romfs_storage = {};
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constinit util::TypedStorage<RomFsFileSystem> g_stratosphere_romfs_fs = {};
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Result EnsureStratosphereRomfsMounted() {
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std::scoped_lock lk(g_mount_stratosphere_romfs_lock);
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if (AMS_UNLIKELY(!g_mounted_stratosphere_romfs)) {
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/* Mount the SD card. */
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R_TRY(fs::MountSdCard("#strat-romfs-sd"));
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auto sd_guard = SCOPE_GUARD { fs::Unmount("#strat-romfs-sd"); };
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/* Open sd:/atmosphere/stratosphere.romfs. */
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fs::FileHandle stratosphere_romfs_file;
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R_TRY(fs::OpenFile(std::addressof(stratosphere_romfs_file), "#strat-romfs-sd:/atmosphere/stratosphere.romfs", fs::OpenMode_Read));
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/* Setup the storage. */
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/* NOTE: This owns the file, and so on failure it will be closed appropriately. */
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auto storage_guard = util::ConstructAtGuarded(g_stratosphere_romfs_storage, stratosphere_romfs_file, true);
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/* Create the filesystem. */
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auto fs_guard = util::ConstructAtGuarded(g_stratosphere_romfs_fs);
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/* Initialize the filesystem. */
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R_TRY(GetReference(g_stratosphere_romfs_fs).Initialize(GetPointer(g_stratosphere_romfs_storage), nullptr, 0, false));
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/* We succeeded, and so stratosphere.romfs is mounted. */
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fs_guard.Cancel();
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storage_guard.Cancel();
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sd_guard.Cancel();
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g_mounted_stratosphere_romfs = true;
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}
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return ResultSuccess();
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}
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fsa::IFileSystem &GetStratosphereRomFsFileSystem() {
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/* Ensure that stratosphere.romfs is mounted. */
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/* NOTE: Abort is used here to ensure that atmosphere's filesystem is structurally valid. */
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R_ABORT_UNLESS(EnsureStratosphereRomfsMounted());
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return GetReference(g_stratosphere_romfs_fs);
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}
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Result OpenCodeFileSystemImpl(CodeVerificationData *out_verification_data, std::unique_ptr<fsa::IFileSystem> *out, const char *path, ncm::ProgramId program_id) {
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/* Print a path suitable for the remote service. */
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fssrv::sf::Path sf_path;
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R_TRY(FspPathPrintf(std::addressof(sf_path), "%s", path));
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/* Open the filesystem using libnx bindings. */
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static_assert(sizeof(CodeVerificationData) == sizeof(::FsCodeInfo));
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::FsFileSystem fs;
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R_TRY(fsldrOpenCodeFileSystem(reinterpret_cast<::FsCodeInfo *>(out_verification_data), program_id.value, sf_path.str, std::addressof(fs)));
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/* Allocate a new filesystem wrapper. */
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auto fsa = std::make_unique<RemoteFileSystem>(fs);
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R_UNLESS(fsa != nullptr, fs::ResultAllocationFailureInCodeA());
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*out = std::move(fsa);
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return ResultSuccess();
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}
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Result OpenPackageFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out, const char *common_path) {
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/* Open a filesystem using libnx bindings. */
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FsFileSystem fs;
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R_TRY(fsOpenFileSystemWithId(std::addressof(fs), ncm::InvalidProgramId.value, static_cast<::FsFileSystemType>(impl::FileSystemProxyType_Package), common_path));
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/* Allocate a new filesystem wrapper. */
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auto fsa = std::make_unique<RemoteFileSystem>(fs);
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R_UNLESS(fsa != nullptr, fs::ResultAllocationFailureInCodeA());
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*out = std::move(fsa);
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return ResultSuccess();
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}
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Result OpenSdCardCodeFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out, ncm::ProgramId program_id) {
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/* Ensure we don't access the SD card too early. */
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R_UNLESS(cfg::IsSdCardInitialized(), fs::ResultSdCardNotPresent());
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/* Print a path to the program's package. */
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fssrv::sf::Path sf_path;
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R_TRY(FspPathPrintf(std::addressof(sf_path), "%s:/atmosphere/contents/%016lx/exefs.nsp", impl::SdCardFileSystemMountName, program_id.value));
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return OpenPackageFileSystemImpl(out, sf_path.str);
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}
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Result OpenStratosphereCodeFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out, ncm::ProgramId program_id) {
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/* Ensure we don't access the SD card too early. */
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R_UNLESS(cfg::IsSdCardInitialized(), fs::ResultSdCardNotPresent());
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/* Open the program's package. */
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std::unique_ptr<fsa::IFile> package_file;
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{
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/* Get the stratosphere.romfs filesystem. */
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auto &romfs_fs = GetStratosphereRomFsFileSystem();
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/* Print a path to the program's package. */
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fssrv::sf::Path sf_path;
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R_TRY(FspPathPrintf(std::addressof(sf_path), "/atmosphere/contents/%016lX/exefs.nsp", program_id.value));
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/* Open the package within stratosphere.romfs. */
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R_TRY(romfs_fs.OpenFile(std::addressof(package_file), sf_path.str, fs::OpenMode_Read));
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}
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/* Create a file storage for the program's package. */
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auto package_storage = std::make_shared<FileStorage>(std::move(package_file));
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R_UNLESS(package_storage != nullptr, fs::ResultAllocationFailureInCodeA());
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/* Create a partition filesystem. */
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auto package_fs = std::make_unique<fssystem::PartitionFileSystem>();
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R_UNLESS(package_fs != nullptr, fs::ResultAllocationFailureInCodeA());
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/* Initialize the partition filesystem. */
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R_TRY(package_fs->Initialize(package_storage));
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*out = std::move(package_fs);
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return ResultSuccess();
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}
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Result OpenSdCardCodeOrStratosphereCodeOrCodeFileSystemImpl(CodeVerificationData *out_verification_data, std::unique_ptr<fsa::IFileSystem> *out, const char *path, ncm::ProgramId program_id) {
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/* If we can open an sd card code fs, use it. */
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R_SUCCEED_IF(R_SUCCEEDED(OpenSdCardCodeFileSystemImpl(out, program_id)));
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/* If we can open a stratosphere code fs, use it. */
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R_SUCCEED_IF(R_SUCCEEDED(OpenStratosphereCodeFileSystemImpl(out, program_id)));
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/* Otherwise, fall back to a normal code fs. */
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return OpenCodeFileSystemImpl(out_verification_data, out, path, program_id);
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}
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Result OpenHblCodeFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out) {
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/* Get the HBL path. */
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const char *hbl_path = cfg::GetHblPath();
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/* Print a path to the hbl package. */
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fssrv::sf::Path sf_path;
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R_TRY(FspPathPrintf(std::addressof(sf_path), "%s:/%s", impl::SdCardFileSystemMountName, hbl_path[0] == '/' ? hbl_path + 1 : hbl_path));
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return OpenPackageFileSystemImpl(out, sf_path.str);
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}
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Result OpenSdCardFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out) {
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/* Open the SD card. This uses libnx bindings. */
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FsFileSystem fs;
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R_TRY(fsOpenSdCardFileSystem(std::addressof(fs)));
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/* Allocate a new filesystem wrapper. */
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auto fsa = std::make_unique<RemoteFileSystem>(fs);
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R_UNLESS(fsa != nullptr, fs::ResultAllocationFailureInCodeA());
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*out = std::move(fsa);
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return ResultSuccess();
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}
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class OpenFileOnlyFileSystem : public fsa::IFileSystem, public impl::Newable {
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private:
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virtual Result DoCommit() override final {
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return ResultSuccess();
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}
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virtual Result DoOpenDirectory(std::unique_ptr<fsa::IDirectory> *out_dir, const char *path, OpenDirectoryMode mode) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoGetEntryType(DirectoryEntryType *out, const char *path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoCreateFile(const char *path, s64 size, int flags) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoDeleteFile(const char *path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoCreateDirectory(const char *path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoDeleteDirectory(const char *path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoDeleteDirectoryRecursively(const char *path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoRenameFile(const char *old_path, const char *new_path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoRenameDirectory(const char *old_path, const char *new_path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoCleanDirectoryRecursively(const char *path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoGetFreeSpaceSize(s64 *out, const char *path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoGetTotalSpaceSize(s64 *out, const char *path) override final {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result DoCommitProvisionally(s64 counter) override final {
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return fs::ResultUnsupportedOperation();
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}
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};
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class SdCardRedirectionCodeFileSystem : public OpenFileOnlyFileSystem {
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private:
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util::optional<ReadOnlyFileSystem> sd_content_fs;
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ReadOnlyFileSystem code_fs;
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bool is_redirect;
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public:
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SdCardRedirectionCodeFileSystem(std::unique_ptr<fsa::IFileSystem> &&code, ncm::ProgramId program_id, bool redirect) : code_fs(std::move(code)), is_redirect(redirect) {
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if (!cfg::IsSdCardInitialized()) {
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return;
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}
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/* Open an SD card filesystem. */
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std::unique_ptr<fsa::IFileSystem> sd_fs;
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if (R_FAILED(OpenSdCardFileSystemImpl(std::addressof(sd_fs)))) {
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return;
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}
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/* Create a redirection filesystem to the relevant content folder. */
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char path[fs::EntryNameLengthMax + 1];
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util::SNPrintf(path, sizeof(path), "/atmosphere/contents/%016lx/exefs", program_id.value);
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auto subdir_fs = std::make_unique<fssystem::SubDirectoryFileSystem>(std::move(sd_fs), path);
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if (subdir_fs == nullptr) {
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return;
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}
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sd_content_fs.emplace(std::move(subdir_fs));
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}
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private:
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bool IsFileStubbed(const char *path) {
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/* If we don't have an sd content fs, nothing is stubbed. */
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if (!this->sd_content_fs) {
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return false;
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}
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/* Create a path representing the stub. */
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char stub_path[fs::EntryNameLengthMax + 1];
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util::SNPrintf(stub_path, sizeof(stub_path), "%s.stub", path);
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/* Query whether we have the file. */
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bool has_file;
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if (R_FAILED(fssystem::HasFile(std::addressof(has_file), std::addressof(*this->sd_content_fs), stub_path))) {
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return false;
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}
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return has_file;
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}
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virtual Result DoOpenFile(std::unique_ptr<fsa::IFile> *out_file, const char *path, OpenMode mode) override final {
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/* Only allow opening files with mode = read. */
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R_UNLESS((mode & fs::OpenMode_All) == fs::OpenMode_Read, fs::ResultInvalidOpenMode());
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/* If we support redirection, we'd like to prefer a file from the sd card. */
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if (this->is_redirect) {
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R_SUCCEED_IF(R_SUCCEEDED(this->sd_content_fs->OpenFile(out_file, path, mode)));
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}
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/* Otherwise, check if the file is stubbed. */
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R_UNLESS(!this->IsFileStubbed(path), fs::ResultPathNotFound());
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/* Open a file from the base code fs. */
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return this->code_fs.OpenFile(out_file, path, mode);
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}
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};
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class AtmosphereCodeFileSystem : public OpenFileOnlyFileSystem {
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private:
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util::optional<SdCardRedirectionCodeFileSystem> code_fs;
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util::optional<ReadOnlyFileSystem> hbl_fs;
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ncm::ProgramId program_id;
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bool initialized;
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public:
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AtmosphereCodeFileSystem() : initialized(false) { /* ... */ }
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Result Initialize(CodeVerificationData *out_verification_data, const char *path, ncm::ProgramId program_id, bool is_hbl, bool is_specific) {
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AMS_ABORT_UNLESS(!this->initialized);
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/* If we're hbl, we need to open a hbl fs. */
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if (is_hbl) {
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std::unique_ptr<fsa::IFileSystem> fsa;
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R_TRY(OpenHblCodeFileSystemImpl(std::addressof(fsa)));
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this->hbl_fs.emplace(std::move(fsa));
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}
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/* Open the code filesystem. */
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std::unique_ptr<fsa::IFileSystem> fsa;
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R_TRY(OpenSdCardCodeOrStratosphereCodeOrCodeFileSystemImpl(out_verification_data, std::addressof(fsa), path, program_id));
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this->code_fs.emplace(std::move(fsa), program_id, is_specific);
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this->program_id = program_id;
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this->initialized = true;
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return ResultSuccess();
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}
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private:
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virtual Result DoOpenFile(std::unique_ptr<fsa::IFile> *out_file, const char *path, OpenMode mode) override final {
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/* Ensure that we're initialized. */
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R_UNLESS(this->initialized, fs::ResultNotInitialized());
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/* Only allow opening files with mode = read. */
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R_UNLESS((mode & fs::OpenMode_All) == fs::OpenMode_Read, fs::ResultInvalidOpenMode());
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/* First, check if there's an external code. */
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{
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fsa::IFileSystem *ecs = fssystem::GetExternalCodeFileSystem(this->program_id);
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if (ecs != nullptr) {
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return ecs->OpenFile(out_file, path, mode);
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}
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}
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/* If we're hbl, open from the hbl fs. */
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if (this->hbl_fs) {
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return this->hbl_fs->OpenFile(out_file, path, mode);
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}
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/* If we're not hbl, fall back to our code filesystem. */
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return this->code_fs->OpenFile(out_file, path, mode);
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}
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};
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}
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Result MountCode(CodeVerificationData *out, const char *name, const char *path, ncm::ProgramId program_id) {
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/* Clear the output. */
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std::memset(out, 0, sizeof(*out));
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/* Validate the mount name. */
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R_TRY(impl::CheckMountName(name));
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/* Validate the path isn't null. */
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R_UNLESS(path != nullptr, fs::ResultInvalidPath());
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/* Open the code file system. */
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std::unique_ptr<fsa::IFileSystem> fsa;
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R_TRY(OpenCodeFileSystemImpl(out, std::addressof(fsa), path, program_id));
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/* Register. */
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return fsa::Register(name, std::move(fsa));
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}
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Result MountCodeForAtmosphereWithRedirection(CodeVerificationData *out, const char *name, const char *path, ncm::ProgramId program_id, bool is_hbl, bool is_specific) {
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/* Clear the output. */
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std::memset(out, 0, sizeof(*out));
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/* Validate the mount name. */
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R_TRY(impl::CheckMountName(name));
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/* Validate the path isn't null. */
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R_UNLESS(path != nullptr, fs::ResultInvalidPath());
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/* Create an AtmosphereCodeFileSystem. */
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auto ams_code_fs = std::make_unique<AtmosphereCodeFileSystem>();
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R_UNLESS(ams_code_fs != nullptr, fs::ResultAllocationFailureInCodeA());
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/* Initialize the code file system. */
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R_TRY(ams_code_fs->Initialize(out, path, program_id, is_hbl, is_specific));
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/* Register. */
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return fsa::Register(name, std::move(ams_code_fs));
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}
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Result MountCodeForAtmosphere(CodeVerificationData *out, const char *name, const char *path, ncm::ProgramId program_id) {
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/* Clear the output. */
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std::memset(out, 0, sizeof(*out));
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/* Validate the mount name. */
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R_TRY(impl::CheckMountName(name));
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/* Validate the path isn't null. */
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R_UNLESS(path != nullptr, fs::ResultInvalidPath());
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/* Open the code file system. */
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std::unique_ptr<fsa::IFileSystem> fsa;
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R_TRY(OpenSdCardCodeOrStratosphereCodeOrCodeFileSystemImpl(out, std::addressof(fsa), path, program_id));
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/* Create a wrapper fs. */
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auto wrap_fsa = std::make_unique<SdCardRedirectionCodeFileSystem>(std::move(fsa), program_id, false);
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R_UNLESS(wrap_fsa != nullptr, fs::ResultAllocationFailureInCodeA());
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/* Register. */
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return fsa::Register(name, std::move(wrap_fsa));
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}
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}
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