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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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.
*/
#include <fcntl.h>
#include <stdint.h>
#include <sys/stat.h>
#include <unistd.h>
#if defined(__linux__)
#include <linux/fs.h>
#include <sys/ioctl.h>
#endif
#include <android-base/file.h>
#include <ext4_utils/ext4_utils.h>
#include <openssl/sha.h>
#ifdef __ANDROID__
#include <cutils/android_get_control_file.h>
#endif
#include "utility.h"
namespace android {
namespace fs_mgr {
bool GetDescriptorSize(int fd, uint64_t* size) {
#if !defined(_WIN32)
struct stat s;
if (fstat(fd, &s) < 0) {
PERROR << __PRETTY_FUNCTION__ << "fstat failed";
return false;
}
if (S_ISBLK(s.st_mode)) {
*size = get_block_device_size(fd);
return *size != 0;
}
#endif
int64_t result = SeekFile64(fd, 0, SEEK_END);
if (result == -1) {
PERROR << __PRETTY_FUNCTION__ << "lseek failed";
return false;
}
*size = result;
return true;
}
int64_t SeekFile64(int fd, int64_t offset, int whence) {
static_assert(sizeof(off_t) == sizeof(int64_t), "Need 64-bit lseek");
return lseek(fd, offset, whence);
}
int64_t GetPrimaryGeometryOffset() {
return LP_PARTITION_RESERVED_BYTES;
}
int64_t GetBackupGeometryOffset() {
return GetPrimaryGeometryOffset() + LP_METADATA_GEOMETRY_SIZE;
}
int64_t GetPrimaryMetadataOffset(const LpMetadataGeometry& geometry, uint32_t slot_number) {
CHECK(slot_number < geometry.metadata_slot_count);
int64_t offset = LP_PARTITION_RESERVED_BYTES + (LP_METADATA_GEOMETRY_SIZE * 2) +
geometry.metadata_max_size * slot_number;
return offset;
}
int64_t GetBackupMetadataOffset(const LpMetadataGeometry& geometry, uint32_t slot_number) {
CHECK(slot_number < geometry.metadata_slot_count);
int64_t start = LP_PARTITION_RESERVED_BYTES + (LP_METADATA_GEOMETRY_SIZE * 2) +
int64_t(geometry.metadata_max_size) * geometry.metadata_slot_count;
return start + int64_t(geometry.metadata_max_size * slot_number);
}
uint64_t GetTotalMetadataSize(uint32_t metadata_max_size, uint32_t max_slots) {
return LP_PARTITION_RESERVED_BYTES +
(LP_METADATA_GEOMETRY_SIZE + metadata_max_size * max_slots) * 2;
}
const LpMetadataBlockDevice* GetMetadataSuperBlockDevice(const LpMetadata& metadata) {
if (metadata.block_devices.empty()) {
return nullptr;
}
return &metadata.block_devices[0];
}
void SHA256(const void* data, size_t length, uint8_t out[32]) {
SHA256_CTX c;
SHA256_Init(&c);
SHA256_Update(&c, data, length);
SHA256_Final(out, &c);
}
uint32_t SlotNumberForSlotSuffix(const std::string& suffix) {
if (suffix.empty() || suffix == "a" || suffix == "_a") {
return 0;
} else if (suffix == "b" || suffix == "_b") {
return 1;
} else {
LERROR << __PRETTY_FUNCTION__ << "slot '" << suffix
<< "' does not have a recognized format.";
return 0;
}
}
uint64_t GetTotalSuperPartitionSize(const LpMetadata& metadata) {
uint64_t size = 0;
for (const auto& block_device : metadata.block_devices) {
size += block_device.size;
}
return size;
}
std::vector<std::string> GetBlockDevicePartitionNames(const LpMetadata& metadata) {
std::vector<std::string> list;
for (const auto& block_device : metadata.block_devices) {
list.emplace_back(GetBlockDevicePartitionName(block_device));
}
return list;
}
std::string GetPartitionSlotSuffix(const std::string& partition_name) {
if (partition_name.size() <= 2) {
return "";
}
std::string suffix = partition_name.substr(partition_name.size() - 2);
return (suffix == "_a" || suffix == "_b") ? suffix : "";
}
std::string SlotSuffixForSlotNumber(uint32_t slot_number) {
CHECK(slot_number == 0 || slot_number == 1);
return (slot_number == 0) ? "_a" : "_b";
}
bool UpdateBlockDevicePartitionName(LpMetadataBlockDevice* device, const std::string& name) {
if (name.size() > sizeof(device->partition_name)) {
return false;
}
strncpy(device->partition_name, name.c_str(), sizeof(device->partition_name));
return true;
}
bool UpdatePartitionGroupName(LpMetadataPartitionGroup* group, const std::string& name) {
if (name.size() > sizeof(group->name)) {
return false;
}
strncpy(group->name, name.c_str(), sizeof(group->name));
return true;
}
bool SetBlockReadonly(int fd, bool readonly) {
#if defined(__linux__)
int val = readonly;
return ioctl(fd, BLKROSET, &val) == 0;
#else
(void)fd;
(void)readonly;
return true;
#endif
}
base::unique_fd GetControlFileOrOpen(const char* path, int flags) {
#if defined(__ANDROID__)
int fd = android_get_control_file(path);
if (fd >= 0) {
int newfd = TEMP_FAILURE_RETRY(dup(fd));
if (newfd >= 0) {
return base::unique_fd(newfd);
}
PERROR << "Cannot dup fd for already controlled file: " << path << ", reopening...";
}
#endif
return base::unique_fd(open(path, flags));
}
} // namespace fs_mgr
} // namespace android
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