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sysupdater: implement content meta mounting

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Michael Scire 2020-06-26 02:24:52 -07:00 • committed by SciresM
parent 28a6bb713c
commit a6218ed814
7 changed files with 305 additions and 6 deletions
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200
stratosphere/ams_mitm/source/sysupdater/sysupdater_fs_utils.cpp
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@ -18,9 +18,203 @@
namespace ams::mitm::sysupdater {
Result MountContentMeta(const char *mount_name, const char *path) {
/* TODO: Implement */
AMS_ABORT();
namespace {
constexpr inline const char * const NcaExtension = ".nca";
constexpr inline const char * const NspExtension = ".nsp";
constexpr inline const size_t NcaExtensionSize = 4;
constexpr inline const size_t NspExtensionSize = 4;
static_assert(NcaExtensionSize == NspExtensionSize);
constexpr inline const size_t NcaNspExtensionSize = NcaExtensionSize;
constexpr inline std::underlying_type<fssrv::PathNormalizer::Option>::type SdCardContentMetaPathNormalizeOption = fssrv::PathNormalizer::Option_PreserveTailSeparator |
fssrv::PathNormalizer::Option_HasMountName;
Result CheckNcaOrNsp(const char **path) {
/* Ensure that the path is currently at the mount name delimeter. */
R_UNLESS(std::strncmp(*path, ams::fs::impl::MountNameDelimiter, strnlen(ams::fs::impl::MountNameDelimiter, ams::fs::EntryNameLengthMax)) == 0, fs::ResultPathNotFound());
/* Advance past the :. */
static_assert(ams::fs::impl::MountNameDelimiter[0] == ':');
*path += 1;
/* Ensure path is long enough for the extension. */
const auto path_len = strnlen(*path, ams::fs::EntryNameLengthMax);
R_UNLESS(path_len > NcaNspExtensionSize, fs::ResultPathNotFound());
/* Get the extension. */
const char * const extension = *path + path_len - NcaNspExtensionSize;
/* Ensure nca or nsp. */
const bool is_nca = util::Strnicmp(extension, NcaExtension, NcaNspExtensionSize) == 0;
const bool is_nsp = util::Strnicmp(extension, NspExtension, NcaNspExtensionSize) == 0;
R_UNLESS(is_nca || is_nsp, fs::ResultPathNotFound());
return ResultSuccess();
}
Result ParseMountName(const char **path, std::shared_ptr<ams::fs::fsa::IFileSystem> *out) {
/* The equivalent function here supports all the common mount names; we'll only support the SD card. */
if (const auto sd_mount_len = strnlen(ams::fs::impl::SdCardFileSystemMountName, ams::fs::MountNameLengthMax); std::strncmp(*path, ams::fs::impl::SdCardFileSystemMountName, sd_mount_len) == 0) {
/* Open an sd card fs. */
*path += sd_mount_len;
/* Open the SD card. This uses libnx bindings. */
FsFileSystem fs;
R_TRY(fsOpenSdCardFileSystem(std::addressof(fs)));
/* Allocate a new filesystem wrapper. */
auto fsa = std::make_shared<ams::fs::RemoteFileSystem>(fs);
R_UNLESS(fsa != nullptr, fs::ResultAllocationFailureInSdCardA());
/* Set the output fs. */
*out = std::move(fsa);
} else {
return fs::ResultPathNotFound();
}
/* Ensure that there's something that could be a mount name delimiter. */
R_UNLESS(strnlen(*path, fs::EntryNameLengthMax) != 0, fs::ResultPathNotFound());
return ResultSuccess();
}
Result ParseNsp(const char **path, std::shared_ptr<ams::fs::fsa::IFileSystem> *out, std::shared_ptr<ams::fs::fsa::IFileSystem> base_fs) {
const char *work_path = *path;
/* Advance to the nsp extension. */
while (true) {
if (util::Strnicmp(work_path, NspExtension, NspExtensionSize) == 0) {
if (work_path[NspExtensionSize] == '\x00' || work_path[NspExtensionSize] == '/') {
break;
}
work_path += NspExtensionSize;
} else {
R_UNLESS(*work_path != '\x00', fs::ResultPathNotFound());
work_path += 1;
}
}
/* Advance past the extension. */
work_path += NspExtensionSize;
/* Get the nsp path. */
char nsp_path[fs::EntryNameLengthMax + 1];
R_UNLESS(static_cast<size_t>(work_path - *path) <= sizeof(nsp_path), fs::ResultTooLongPath());
std::memcpy(nsp_path, *path, work_path - *path);
nsp_path[work_path - *path] = '\x00';
/* Open the file storage. */
std::shared_ptr<ams::fs::FileStorageBasedFileSystem> file_storage = fssystem::AllocateShared<ams::fs::FileStorageBasedFileSystem>();
R_UNLESS(file_storage != nullptr, fs::ResultAllocationFailureInFileSystemProxyCoreImplD());
R_TRY(file_storage->Initialize(std::move(base_fs), nsp_path, ams::fs::OpenMode_Read));
/* Create a partition fs. */
R_TRY(fssystem::GetFileSystemCreatorInterfaces()->partition_fs_creator->Create(out, std::move(file_storage)));
/* Update the path. */
*path = work_path;
return ResultSuccess();
}
Result ParseNca(const char **path, std::shared_ptr<fssystem::NcaReader> *out, std::shared_ptr<ams::fs::fsa::IFileSystem> base_fs) {
/* Open the file storage. */
std::shared_ptr<ams::fs::FileStorageBasedFileSystem> file_storage = fssystem::AllocateShared<ams::fs::FileStorageBasedFileSystem>();
R_UNLESS(file_storage != nullptr, fs::ResultAllocationFailureInFileSystemProxyCoreImplE());
R_TRY(file_storage->Initialize(std::move(base_fs), *path, ams::fs::OpenMode_Read));
/* Create the nca reader. */
std::shared_ptr<fssystem::NcaReader> nca_reader;
R_TRY(fssystem::GetFileSystemCreatorInterfaces()->storage_on_nca_creator->CreateNcaReader(std::addressof(nca_reader), file_storage));
/* NOTE: Here Nintendo validates program ID, but this does not need checking in the meta case. */
/* Set output reader. */
*out = std::move(nca_reader);
return ResultSuccess();
}
Result OpenMetaStorage(std::shared_ptr<ams::fs::IStorage> *out, std::shared_ptr<fssystem::NcaReader> nca_reader, fssystem::NcaFsHeader::FsType *out_fs_type) {
/* Ensure the nca is a meta nca. */
R_UNLESS(nca_reader->GetContentType() == fssystem::NcaHeader::ContentType::Meta, fs::ResultPreconditionViolation());
/* We only support SD card ncas, so ensure this isn't a gamecard nca. */
R_UNLESS(nca_reader->GetDistributionType() != fssystem::NcaHeader::DistributionType::GameCard, fs::ResultPermissionDenied());
/* Here Nintendo would call GetPartitionIndex(), but we don't need to, because it's meta. */
constexpr int MetaPartitionIndex = 0;
/* Open fs header reader. */
fssystem::NcaFsHeaderReader fs_header_reader;
R_TRY(fssystem::GetFileSystemCreatorInterfaces()->storage_on_nca_creator->Create(out, std::addressof(fs_header_reader), std::move(nca_reader), MetaPartitionIndex, false));
/* Set the output fs type. */
*out_fs_type = fs_header_reader.GetFsType();
return ResultSuccess();
}
Result OpenContentMetaFileSystem(std::shared_ptr<ams::fs::fsa::IFileSystem> *out, const char *path) {
/* Parse the mount name to get a filesystem. */
const char *cur_path = path;
std::shared_ptr<ams::fs::fsa::IFileSystem> base_fs;
R_TRY(ParseMountName(std::addressof(cur_path), std::addressof(base_fs)));
/* Ensure the path is an nca or nsp. */
R_TRY(CheckNcaOrNsp(std::addressof(cur_path)));
/* Try to parse as nsp. */
std::shared_ptr<ams::fs::fsa::IFileSystem> nsp_fs;
if (R_SUCCEEDED(ParseNsp(std::addressof(cur_path), std::addressof(nsp_fs), base_fs))) {
/* nsp target is only allowed for type package, and we're assuming type meta. */
R_UNLESS(*path != '\x00', fs::ResultInvalidArgument());
/* Use the nsp fs as the base fs. */
base_fs = std::move(nsp_fs);
}
/* Parse as nca. */
std::shared_ptr<fssystem::NcaReader> nca_reader;
R_TRY(ParseNca(std::addressof(cur_path), std::addressof(nca_reader), std::move(base_fs)));
/* Open meta storage. */
std::shared_ptr<ams::fs::IStorage> storage;
fssystem::NcaFsHeader::FsType fs_type;
R_TRY(OpenMetaStorage(std::addressof(storage), std::move(nca_reader), std::addressof(fs_type)));
/* Open the appropriate interface. */
const auto * const creator_intfs = fssystem::GetFileSystemCreatorInterfaces();
switch (fs_type) {
case fssystem::NcaFsHeader::FsType::PartitionFs: return creator_intfs->partition_fs_creator->Create(out, std::move(storage));
case fssystem::NcaFsHeader::FsType::RomFs: return creator_intfs->rom_fs_creator->Create(out, std::move(storage));
default:
return fs::ResultInvalidNcaFileSystemType();
}
}
}
Result MountSdCardContentMeta(const char *mount_name, const char *path) {
/* Sanitize input. */
/* NOTE: This is an internal API, so we won't bother with mount name sanitization. */
R_UNLESS(path != nullptr, fs::ResultInvalidPath());
/* Normalize the path. */
fssrv::PathNormalizer normalized_path(path, SdCardContentMetaPathNormalizeOption);
R_TRY(normalized_path.GetResult());
/* Open the filesystem. */
std::shared_ptr<ams::fs::fsa::IFileSystem> fs;
R_TRY(OpenContentMetaFileSystem(std::addressof(fs), normalized_path.GetPath()));
/* Create a holder for the fs. */
std::unique_ptr unique_fs = std::make_unique<ams::fs::SharedFileSystemHolder>(std::move(fs));
R_UNLESS(unique_fs != nullptr, fs::ResultAllocationFailureInNew());
/* Register the fs. */
return ams::fs::fsa::Register(mount_name, std::move(unique_fs));
}
}