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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.
*/
#ifndef __CORE_FS_MGR_PRIV_AVB_OPS_H
#define __CORE_FS_MGR_PRIV_AVB_OPS_H
#include <map>
#include <string>
#include <libavb/libavb.h>
#include "fs_mgr.h"
// 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 FsManagerAvbVerifier for more details.
//
class FsManagerAvbOps {
public:
FsManagerAvbOps(const fstab& fstab);
FsManagerAvbOps(std::map<std::string, std::string>&& by_name_symlink_map);
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,
AvbSlotVerifyData** out_data);
private:
void InitializeAvbOps();
AvbOps avb_ops_;
std::map<std::string, std::string> by_name_symlink_map_;
};
#endif /* __CORE_FS_MGR_PRIV_AVB_OPS_H */
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