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Atmosphere/stratosphere/ams_mitm/source/set_mitm/settings_sd_kvs.cpp

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/*
* 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_fs_utils.hpp"
#include "settings_sd_kvs.hpp"
namespace ams::settings::fwdbg {
namespace {
struct SdKeyValueStoreEntry {
const char *name;
const char *key;
void *value;
size_t value_size;
constexpr inline bool HasValue() const { return this->value != nullptr; }
constexpr inline void GetNameAndKey(char *dst) const {
size_t offset = 0;
for (size_t i = 0; i < std::strlen(this->name); i++) {
dst[offset++] = this->name[i];
}
dst[offset++] = '!';
for (size_t i = 0; i < std::strlen(this->key); i++) {
dst[offset++] = this->key[i];
}
dst[offset] = 0;
}
};
static_assert(util::is_pod<SdKeyValueStoreEntry>::value);
constexpr inline bool operator==(const SdKeyValueStoreEntry &lhs, const SdKeyValueStoreEntry &rhs) {
if (lhs.HasValue() != rhs.HasValue()) {
return false;
}
return lhs.HasValue() && std::strcmp(lhs.name, rhs.name) == 0 && std::strcmp(lhs.key, rhs.key) == 0;
}
inline bool operator<(const SdKeyValueStoreEntry &lhs, const SdKeyValueStoreEntry &rhs) {
AMS_ABORT_UNLESS(lhs.HasValue());
AMS_ABORT_UNLESS(rhs.HasValue());
char lhs_name_key[SettingsNameLengthMax + 1 + SettingsItemKeyLengthMax + 1];
char rhs_name_key[SettingsNameLengthMax + 1 + SettingsItemKeyLengthMax + 1];
lhs.GetNameAndKey(lhs_name_key);
rhs.GetNameAndKey(rhs_name_key);
return std::strcmp(lhs_name_key, rhs_name_key) < 0;
}
constexpr size_t MaxEntries = 0x200;
constexpr size_t SettingsItemValueStorageSize = 0x10000;
SettingsName g_names[MaxEntries];
SettingsItemKey g_item_keys[MaxEntries];
u8 g_value_storage[SettingsItemValueStorageSize];
size_t g_allocated_value_storage_size;
SdKeyValueStoreEntry g_entries[MaxEntries];
size_t g_num_entries;
constexpr bool IsValidSettingsFormat(const char *str, size_t len) {
AMS_ABORT_UNLESS(str != nullptr);
if (len > 0 && str[len - 1] == '.') {
return false;
}
for (size_t i = 0; i < len; i++) {
const char c = str[i];
if ('a' <= c && c <= 'z') {
continue;
}
if ('0' <= c && c <= '9') {
continue;
}
if (c == '-' || c == '.' || c == '_') {
continue;
}
return false;
}
return true;
}
constexpr bool IsHexadecimal(const char *str) {
while (*str) {
if (std::isxdigit(static_cast<unsigned char>(*str))) {
str++;
} else {
return false;
}
}
return true;
}
constexpr inline char hextoi(char c) {
if ('a' <= c && c <= 'f') return c - 'a' + 0xA;
if ('A' <= c && c <= 'F') return c - 'A' + 0xA;
if ('0' <= c && c <= '9') return c - '0';
return 0;
}
Result ValidateSettingsName(const char *name) {
R_UNLESS(name != nullptr, ResultSettingsNameNull());
const size_t len = strnlen(name, SettingsNameLengthMax + 1);
R_UNLESS(len > 0, ResultSettingsNameEmpty());
R_UNLESS(len <= SettingsNameLengthMax, ResultSettingsNameTooLong());
R_UNLESS(IsValidSettingsFormat(name, len), ResultSettingsNameInvalidFormat());
return ResultSuccess();
}
Result ValidateSettingsItemKey(const char *key) {
R_UNLESS(key != nullptr, ResultSettingsNameNull());
const size_t len = strnlen(key, SettingsItemKeyLengthMax + 1);
R_UNLESS(len > 0, ResultSettingsItemKeyEmpty());
R_UNLESS(len <= SettingsNameLengthMax, ResultSettingsItemKeyTooLong());
R_UNLESS(IsValidSettingsFormat(key, len), ResultSettingsItemKeyInvalidFormat());
return ResultSuccess();
}
Result AllocateValue(void **out, size_t size) {
R_UNLESS(g_allocated_value_storage_size + size <= sizeof(g_value_storage), ResultSettingsItemValueAllocationFailed());
*out = g_value_storage + g_allocated_value_storage_size;
g_allocated_value_storage_size += size;
return ResultSuccess();
}
Result FindSettingsName(const char **out, const char *name) {
for (auto &stored : g_names) {
if (std::strcmp(stored.value, name) == 0) {
*out = stored.value;
return ResultSuccess();
} else if (std::strcmp(stored.value, "") == 0) {
*out = stored.value;
std::strcpy(stored.value, name);
return ResultSuccess();
}
}
return ResultSettingsItemKeyAllocationFailed();
}
Result FindSettingsItemKey(const char **out, const char *key) {
for (auto &stored : g_item_keys) {
if (std::strcmp(stored.value, key) == 0) {
*out = stored.value;
return ResultSuccess();
} else if (std::strcmp(stored.value, "") == 0) {
std::strcpy(stored.value, key);
*out = stored.value;
return ResultSuccess();
}
}
return ResultSettingsItemKeyAllocationFailed();
}
template<typename T>
Result ParseSettingsItemIntegralValue(SdKeyValueStoreEntry &out, const char *value_str) {
R_TRY(AllocateValue(&out.value, sizeof(T)));
out.value_size = sizeof(T);
T value = static_cast<T>(strtoul(value_str, nullptr, 0));
std::memcpy(out.value, &value, sizeof(T));
return ResultSuccess();
}
Result GetEntry(SdKeyValueStoreEntry **out, const char *name, const char *key) {
/* Validate name/key. */
R_TRY(ValidateSettingsName(name));
R_TRY(ValidateSettingsItemKey(key));
u8 dummy_value = 0;
SdKeyValueStoreEntry test_entry { .name = name, .key = key, .value = &dummy_value, .value_size = sizeof(dummy_value) };
auto *begin = g_entries;
auto *end = begin + g_num_entries;
auto it = std::lower_bound(begin, end, test_entry);
R_UNLESS(it != end, ResultSettingsItemNotFound());
R_UNLESS(*it == test_entry, ResultSettingsItemNotFound());
*out = &*it;
return ResultSuccess();
}
Result ParseSettingsItemValueImpl(const char *name, const char *key, const char *val_tup) {
const char *delimiter = strchr(val_tup, '!');
const char *value_str = delimiter + 1;
const char *type = val_tup;
R_UNLESS(delimiter != nullptr, ResultSettingsItemValueInvalidFormat());
while (std::isspace(static_cast<unsigned char>(*type)) && type != delimiter) {
type++;
}
const size_t type_len = delimiter - type;
const size_t value_len = strlen(value_str);
R_UNLESS(type_len > 0, ResultSettingsItemValueInvalidFormat());
R_UNLESS(value_len > 0, ResultSettingsItemValueInvalidFormat());
/* Create new value. */
SdKeyValueStoreEntry new_value = {};
/* Find name and key. */
R_TRY(FindSettingsName(&new_value.name, name));
R_TRY(FindSettingsItemKey(&new_value.key, key));
if (strncasecmp(type, "str", type_len) == 0 || strncasecmp(type, "string", type_len) == 0) {
const size_t size = value_len + 1;
R_TRY(AllocateValue(&new_value.value, size));
std::memcpy(new_value.value, value_str, size);
new_value.value_size = size;
} else if (strncasecmp(type, "hex", type_len) == 0 || strncasecmp(type, "bytes", type_len) == 0) {
R_UNLESS(value_len > 0, ResultSettingsItemValueInvalidFormat());
R_UNLESS(value_len % 2 == 0, ResultSettingsItemValueInvalidFormat());
R_UNLESS(IsHexadecimal(value_str), ResultSettingsItemValueInvalidFormat());
const size_t size = value_len / 2;
R_TRY(AllocateValue(&new_value.value, size));
new_value.value_size = size;
u8 *data = reinterpret_cast<u8 *>(new_value.value);
for (size_t i = 0; i < size; i++) {
data[i >> 1] = hextoi(value_str[i]) << (4 * (i & 1));
}
} else if (strncasecmp(type, "u8", type_len) == 0) {
R_TRY((ParseSettingsItemIntegralValue<u8>(new_value, value_str)));
} else if (strncasecmp(type, "u16", type_len) == 0) {
R_TRY((ParseSettingsItemIntegralValue<u16>(new_value, value_str)));
} else if (strncasecmp(type, "u32", type_len) == 0) {
R_TRY((ParseSettingsItemIntegralValue<u32>(new_value, value_str)));
} else if (strncasecmp(type, "u64", type_len) == 0) {
R_TRY((ParseSettingsItemIntegralValue<u64>(new_value, value_str)));
} else {
return ResultSettingsItemValueInvalidFormat();
}
/* Insert the entry. */
bool inserted = false;
for (auto &entry : g_entries) {
if (!entry.HasValue() || entry == new_value) {
entry = new_value;
inserted = true;
break;
}
}
R_UNLESS(inserted, ResultSettingsItemValueAllocationFailed());
return ResultSuccess();
}
Result ParseSettingsItemValue(const char *name, const char *key, const char *value) {
R_TRY(ValidateSettingsName(name));
R_TRY(ValidateSettingsItemKey(key));
return ParseSettingsItemValueImpl(name, key, value);
}
static int SystemSettingsIniHandler(void *user, const char *name, const char *key, const char *value) {
Result *parse_res = reinterpret_cast<Result *>(user);
/* Once we fail to parse a value, don't parse further. */
if (R_FAILED(*parse_res)) {
return 0;
}
*parse_res = ParseSettingsItemValue(name, key, value);
return R_SUCCEEDED(*parse_res) ? 1 : 0;
}
Result LoadSdCardKeyValueStore() {
/* Open file. */
/* It's okay if the file isn't readable/present, because we already loaded defaults. */
std::unique_ptr<ams::fs::fsa::IFile> file;
{
FsFile f;
R_SUCCEED_IF(R_FAILED(ams::mitm::fs::OpenAtmosphereSdFile(std::addressof(f), "/config/system_settings.ini", fs::OpenMode_Read)));
file = std::make_unique<ams::fs::RemoteFile>(f);
}
AMS_ABORT_UNLESS(file != nullptr);
Result parse_result = ResultSuccess();
util::ini::ParseFile(file.get(), &parse_result, SystemSettingsIniHandler);
R_TRY(parse_result);
return ResultSuccess();
}
void LoadDefaultCustomSettings() {
/* Disable uploading error reports to Nintendo. */
R_ABORT_UNLESS(ParseSettingsItemValue("eupld", "upload_enabled", "u8!0x0"));
/* Control whether RO should ease its validation of NROs. */
/* (note: this is normally not necessary, and ips patches can be used.) */
R_ABORT_UNLESS(ParseSettingsItemValue("ro", "ease_nro_restriction", "u8!0x1"));
/* Atmosphere custom settings. */
/* Reboot from fatal automatically after some number of milliseconds. */
/* If field is not present or 0, fatal will wait indefinitely for user input. */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "fatal_auto_reboot_interval", "u64!0x0"));
/* Make the power menu's "reboot" button reboot to payload. */
/* Set to "normal" for normal reboot, "rcm" for rcm reboot. */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "power_menu_reboot_function", "str!payload"));
/* Enable writing to BIS partitions for HBL. */
/* This is probably undesirable for normal usage. */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "enable_hbl_bis_write", "u8!0x0"));
/* Controls whether dmnt cheats should be toggled on or off by */
/* default. 1 = toggled on by default, 0 = toggled off by default. */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "dmnt_cheats_enabled_by_default", "u8!0x1"));
/* Controls whether dmnt should always save cheat toggle state */
/* for restoration on new game launch. 1 = always save toggles, */
/* 0 = only save toggles if toggle file exists. */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "dmnt_always_save_cheat_toggles", "u8!0x0"));
/* Controls whether fs.mitm should redirect save files */
/* to directories on the sd card. */
/* 0 = Do not redirect, 1 = Redirect. */
/* NOTE: EXPERIMENTAL */
/* If you do not know what you are doing, do not touch this yet. */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "fsmitm_redirect_saves_to_sd", "u8!0x0"));
/* Controls whether am sees system settings "DebugModeFlag" as */
/* enabled or disabled. */
/* 0 = Disabled (not debug mode), 1 = Enabled (debug mode) */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "enable_am_debug_mode", "u8!0x0"));
/* Controls whether dns.mitm is enabled. */
/* 0 = Disabled, 1 = Enabled */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "enable_dns_mitm", "u8!0x1"));
/* Controls whether dns.mitm uses the default redirections in addition to */
/* whatever is specified in the user's hosts file. */
/* 0 = Disabled (use hosts file contents), 1 = Enabled (use defaults and hosts file contents) */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "add_defaults_to_dns_hosts", "u8!0x1"));
/* Controls whether dns.mitm logs to the sd card for debugging. */
/* 0 = Disabled, 1 = Enabled */
R_ABORT_UNLESS(ParseSettingsItemValue("atmosphere", "enable_dns_mitm_debug_log", "u8!0x0"));
/* Hbloader custom settings. */
/* Controls the size of the homebrew heap when running as applet. */
/* If set to zero, all available applet memory is used as heap. */
/* The default is zero. */
R_ABORT_UNLESS(ParseSettingsItemValue("hbloader", "applet_heap_size", "u64!0x0"));
/* Controls the amount of memory to reserve when running as applet */
/* for usage by other applets. This setting has no effect if */
/* applet_heap_size is non-zero. The default is 0x8600000. */
R_ABORT_UNLESS(ParseSettingsItemValue("hbloader", "applet_heap_reservation_size", "u64!0x8600000"));
}
}
void InitializeSdCardKeyValueStore() {
/* Load in hardcoded defaults. */
/* These will be overwritten if present on the SD card. */
LoadDefaultCustomSettings();
/* Parse custom settings off the SD card. */
R_ABORT_UNLESS(LoadSdCardKeyValueStore());
/* Determine how many custom settings are present. */
for (size_t i = 0; i < util::size(g_entries); i++) {
if (!g_entries[i].HasValue()) {
g_num_entries = i;
break;
}
}
/* Ensure that the custom settings entries are sorted. */
if (g_num_entries) {
std::sort(g_entries, g_entries + g_num_entries);
}
}
Result GetSdCardKeyValueStoreSettingsItemValueSize(size_t *out_size, const char *name, const char *key) {
SdKeyValueStoreEntry *entry = nullptr;
R_TRY(GetEntry(&entry, name, key));
*out_size = entry->value_size;
return ResultSuccess();
}
Result GetSdCardKeyValueStoreSettingsItemValue(size_t *out_size, void *dst, size_t dst_size, const char *name, const char *key) {
R_UNLESS(dst != nullptr, ResultSettingsItemValueBufferNull());
SdKeyValueStoreEntry *entry = nullptr;
R_TRY(GetEntry(&entry, name, key));
const size_t size = std::min(entry->value_size, dst_size);
if (size > 0) {
std::memcpy(dst, entry->value, size);
}
*out_size = size;
return ResultSuccess();
}
}
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