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/*
* Copyright (C) 2019 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 "util.h"
#include <dirent.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <thread>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
#include <linux/fs.h>
namespace android {
namespace fs_mgr {
bool NibbleValue(const char& c, uint8_t* value) {
CHECK(value != nullptr);
switch (c) {
case '0' ... '9':
*value = c - '0';
break;
case 'a' ... 'f':
*value = c - 'a' + 10;
break;
case 'A' ... 'F':
*value = c - 'A' + 10;
break;
default:
return false;
}
return true;
}
bool HexToBytes(uint8_t* bytes, size_t bytes_len, const std::string& hex) {
CHECK(bytes != nullptr);
if (hex.size() % 2 != 0) {
return false;
}
if (hex.size() / 2 > bytes_len) {
return false;
}
for (size_t i = 0, j = 0, n = hex.size(); i < n; i += 2, ++j) {
uint8_t high;
if (!NibbleValue(hex[i], &high)) {
return false;
}
uint8_t low;
if (!NibbleValue(hex[i + 1], &low)) {
return false;
}
bytes[j] = (high << 4) | low;
}
return true;
}
std::string BytesToHex(const uint8_t* bytes, size_t bytes_len) {
CHECK(bytes != nullptr);
static const char* hex_digits = "0123456789abcdef";
std::string hex;
for (size_t i = 0; i < bytes_len; i++) {
hex.push_back(hex_digits[(bytes[i] & 0xF0) >> 4]);
hex.push_back(hex_digits[bytes[i] & 0x0F]);
}
return hex;
}
// TODO: remove duplicate code with fs_mgr_wait_for_file
bool WaitForFile(const std::string& filename, const std::chrono::milliseconds relative_timeout,
FileWaitMode file_wait_mode) {
auto start_time = std::chrono::steady_clock::now();
while (true) {
int rv = access(filename.c_str(), F_OK);
if (file_wait_mode == FileWaitMode::Exists) {
if (!rv || errno != ENOENT) return true;
} else if (file_wait_mode == FileWaitMode::DoesNotExist) {
if (rv && errno == ENOENT) return true;
}
std::this_thread::sleep_for(50ms);
auto now = std::chrono::steady_clock::now();
auto time_elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(now - start_time);
if (time_elapsed > relative_timeout) return false;
}
}
bool IsDeviceUnlocked() {
std::string verified_boot_state;
if (fs_mgr_get_boot_config("verifiedbootstate", &verified_boot_state)) {
return verified_boot_state == "orange";
}
return false;
}
bool SetBlockDeviceReadOnly(const std::string& blockdev) {
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(blockdev.c_str(), O_RDONLY | O_CLOEXEC)));
if (fd < 0) {
return false;
}
int ON = 1;
return ioctl(fd, BLKROSET, &ON) == 0;
}
Result<std::vector<std::string>> ListFiles(const std::string& dir) {
struct dirent* de;
std::vector<std::string> files;
std::unique_ptr<DIR, int (*)(DIR*)> dirp(opendir(dir.c_str()), closedir);
if (!dirp) {
return ErrnoError() << "Failed to opendir: " << dir;
}
while ((de = readdir(dirp.get()))) {
if (de->d_type != DT_REG) continue;
std::string full_path = android::base::StringPrintf("%s/%s", dir.c_str(), de->d_name);
files.emplace_back(std::move(full_path));
}
return files;
}
} // namespace fs_mgr
} // namespace android
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