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/*
*
* Copyright (c) 2020-2022 Project CHIP Authors
* Copyright (c) 2019-2020 Google LLC.
* Copyright (c) 2018 Nest Labs, Inc.
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file
* Utilities for interacting with the the ESP32 "NVS" key-value store.
*/
#pragma once
#include <string.h>
namespace chip {
namespace DeviceLayer {
namespace Internal {
/**
* Provides functions and definitions for accessing device configuration information on the ESP32.
*
* This class is designed to be mixed-in to concrete implementation classes as a means to
* provide access to configuration information to generic base classes.
*/
class ESP32Config
{
public:
struct Key;
class KeyAllocator;
// Maximum length of an NVS key name, as specified in the ESP-IDF documentation.
static constexpr size_t kMaxConfigKeyNameLength = 15;
// NVS namespaces used to store device configuration information.
static const char kConfigNamespace_ChipFactory[];
static const char kConfigNamespace_ChipConfig[];
static const char kConfigNamespace_ChipCounters[];
// Key definitions for well-known keys.
static const Key kConfigKey_SerialNum;
static const Key kConfigKey_MfrDeviceId;
static const Key kConfigKey_MfrDeviceCert;
static const Key kConfigKey_MfrDeviceICACerts;
static const Key kConfigKey_MfrDevicePrivateKey;
static const Key kConfigKey_HardwareVersion;
static const Key kConfigKey_HardwareVersionString;
static const Key kConfigKey_ManufacturingDate;
static const Key kConfigKey_SetupPinCode;
static const Key kConfigKey_SetupDiscriminator;
static const Key kConfigKey_Spake2pIterationCount;
static const Key kConfigKey_Spake2pSalt;
static const Key kConfigKey_Spake2pVerifier;
static const Key kConfigKey_DACCert;
static const Key kConfigKey_DACPrivateKey;
static const Key kConfigKey_DACPublicKey;
static const Key kConfigKey_PAICert;
static const Key kConfigKey_CertDeclaration;
static const Key kConfigKey_VendorId;
static const Key kConfigKey_VendorName;
static const Key kConfigKey_ProductId;
static const Key kConfigKey_ProductName;
static const Key kConfigKey_ProductLabel;
static const Key kConfigKey_ProductURL;
static const Key kConfigKey_SupportedCalTypes;
static const Key kConfigKey_SupportedLocaleSize;
static const Key kConfigKey_RotatingDevIdUniqueId;
static const Key kConfigKey_LocationCapability;
// CHIP Config keys
static const Key kConfigKey_ServiceConfig;
static const Key kConfigKey_PairedAccountId;
static const Key kConfigKey_ServiceId;
static const Key kConfigKey_LastUsedEpochKeyId;
static const Key kConfigKey_FailSafeArmed;
static const Key kConfigKey_WiFiStationSecType;
static const Key kConfigKey_RegulatoryLocation;
static const Key kConfigKey_CountryCode;
static const Key kConfigKey_UniqueId;
// CHIP Counter keys
static const Key kCounterKey_RebootCount;
static const Key kCounterKey_UpTime;
static const Key kCounterKey_TotalOperationalHours;
// Config value accessors.
static CHIP_ERROR ReadConfigValue(Key key, bool & val);
static CHIP_ERROR ReadConfigValue(Key key, uint32_t & val);
static CHIP_ERROR ReadConfigValue(Key key, uint64_t & val);
// If buf is NULL then outLen is set to the required length to fit the string/blob
static CHIP_ERROR ReadConfigValueStr(Key key, char * buf, size_t bufSize, size_t & outLen);
static CHIP_ERROR ReadConfigValueBin(Key key, uint8_t * buf, size_t bufSize, size_t & outLen);
static CHIP_ERROR WriteConfigValue(Key key, bool val);
static CHIP_ERROR WriteConfigValue(Key key, uint32_t val);
static CHIP_ERROR WriteConfigValue(Key key, uint64_t val);
static CHIP_ERROR WriteConfigValueStr(Key key, const char * str);
static CHIP_ERROR WriteConfigValueStr(Key key, const char * str, size_t strLen);
static CHIP_ERROR WriteConfigValueBin(Key key, const uint8_t * data, size_t dataLen);
static CHIP_ERROR ClearConfigValue(Key key);
static bool ConfigValueExists(Key key);
// NVS Namespace helper functions.
static CHIP_ERROR EnsureNamespace(const char * ns);
static CHIP_ERROR ClearNamespace(const char * ns);
static void RunConfigUnitTest(void);
private:
static const char * GetPartitionLabelByNamespace(const char * ns);
};
struct ESP32Config::Key
{
const char * Namespace;
const char * Name;
bool operator==(const Key & other) const;
template <typename T, typename std::enable_if_t<std::is_convertible<T, const char *>::value, int> = 0>
Key(const char * aNamespace, T aName) : Namespace(aNamespace), Name(aName)
{}
template <size_t N>
Key(const char * aNamespace, const char (&aName)[N]) : Namespace(aNamespace), Name(aName)
{
// Note: N includes null-terminator.
static_assert(N <= ESP32Config::kMaxConfigKeyNameLength + 1, "Key too long");
}
};
inline bool ESP32Config::Key::operator==(const Key & other) const
{
return strcmp(Namespace, other.Namespace) == 0 && strcmp(Name, other.Name) == 0;
}
class ESP32Config::KeyAllocator
{
public:
static CHIP_ERROR Locale(char * key, size_t size, uint16_t index)
{
VerifyOrReturnError(key, CHIP_ERROR_INVALID_ARGUMENT);
return snprintf(key, size, "locale/%x", index) > 0 ? CHIP_NO_ERROR : CHIP_ERROR_INTERNAL;
}
static CHIP_ERROR FixedLabelCount(char * key, size_t size, uint16_t endpoint)
{
VerifyOrReturnError(key, CHIP_ERROR_INVALID_ARGUMENT);
return snprintf(key, size, "fl-sz/%x", endpoint) > 0 ? CHIP_NO_ERROR : CHIP_ERROR_INTERNAL;
}
static CHIP_ERROR FixedLabelKey(char * key, size_t size, uint16_t endpoint, uint16_t index)
{
VerifyOrReturnError(key, CHIP_ERROR_INVALID_ARGUMENT);
return snprintf(key, size, "fl-k/%x/%x", endpoint, index) > 0 ? CHIP_NO_ERROR : CHIP_ERROR_INTERNAL;
}
static CHIP_ERROR FixedLabelValue(char * key, size_t size, uint16_t endpoint, uint16_t index)
{
VerifyOrReturnError(key, CHIP_ERROR_INVALID_ARGUMENT);
return snprintf(key, size, "fl-v/%x/%x", endpoint, index) > 0 ? CHIP_NO_ERROR : CHIP_ERROR_INTERNAL;
}
};
} // namespace Internal
} // namespace DeviceLayer
} // namespace chip