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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#pragma once
#include <string>
#include <vector>
#include <fs_avb/types.h>
#include <fstab/fstab.h>
#include <libavb/libavb.h>
namespace android {
namespace fs_mgr {
// This class provides C++ bindings to interact with libavb, a small
// self-contained piece of code that's intended to be used in bootloaders.
// It mainly contains two functions:
// - ReadFromPartition(): to read AVB metadata from a given partition.
// It provides the implementation of AvbOps.read_from_partition() when
// reading metadata through libavb.
// - AvbSlotVerify(): the C++ binding of libavb->avb_slot_verify() to
// read and verify the metadata and store it into the out_data parameter.
// The caller MUST check the integrity of metadata against the
// androidboot.vbmeta.{hash_alg, size, digest} values from /proc/cmdline.
// e.g., see class AvbVerifier for more details.
//
class FsManagerAvbOps {
public:
FsManagerAvbOps();
static FsManagerAvbOps* GetInstanceFromAvbOps(AvbOps* ops) {
return reinterpret_cast<FsManagerAvbOps*>(ops->user_data);
}
AvbIOResult ReadFromPartition(const char* partition, int64_t offset, size_t num_bytes,
void* buffer, size_t* out_num_read);
AvbSlotVerifyResult AvbSlotVerify(const std::string& ab_suffix, AvbSlotVerifyFlags flags,
std::vector<VBMetaData>* out_vbmeta_images);
private:
std::string GetLogicalPath(const std::string& partition_name);
AvbOps avb_ops_;
Fstab fstab_;
};
} // namespace fs_mgr
} // namespace android
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