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/*
* Copyright (C) 2017 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 <hidl-hash/Hash.h>
#include <algorithm>
#include <fstream>
#include <iomanip>
#include <map>
#include <regex>
#include <sstream>
#include <android-base/logging.h>
#include <openssl/sha.h>
namespace android {
const std::vector<uint8_t> Hash::kEmptyHash = std::vector<uint8_t>(SHA256_DIGEST_LENGTH, 0);
Hash& Hash::getMutableHash(const std::string& path) {
static std::map<std::string, Hash> hashes;
auto it = hashes.find(path);
if (hashes.find(path) == hashes.end()) {
it = hashes.insert(it, {path, Hash(path)});
}
return it->second;
}
const Hash& Hash::getHash(const std::string& path) {
return getMutableHash(path);
}
void Hash::clearHash(const std::string& path) {
getMutableHash(path).mHash = kEmptyHash;
}
static std::vector<uint8_t> sha256File(const std::string& path) {
std::ifstream stream(path);
std::stringstream fileStream;
fileStream << stream.rdbuf();
std::string fileContent = fileStream.str();
std::vector<uint8_t> ret = std::vector<uint8_t>(SHA256_DIGEST_LENGTH);
SHA256(reinterpret_cast<const uint8_t*>(fileContent.c_str()), fileContent.size(), ret.data());
return ret;
}
Hash::Hash(const std::string& path) : mPath(path), mHash(sha256File(path)) {}
std::string Hash::hexString(const std::vector<uint8_t>& hash) {
std::ostringstream s;
s << std::hex << std::setfill('0');
for (uint8_t i : hash) {
s << std::setw(2) << static_cast<int>(i);
}
return s.str();
}
std::string Hash::hexString() const {
return hexString(mHash);
}
const std::vector<uint8_t>& Hash::raw() const {
return mHash;
}
const std::string& Hash::getPath() const {
return mPath;
}
#define HASH "([0-9a-f]+)"
#define FQNAME "([^\\s]+)"
#define SPACES " +"
#define MAYBE_SPACES " *"
#define OPTIONAL_COMMENT "(?:#.*)?"
static const std::regex kHashLine("(?:" MAYBE_SPACES HASH SPACES FQNAME MAYBE_SPACES
")?" OPTIONAL_COMMENT);
struct HashFile {
static const HashFile* parse(const std::string& path, std::string* err) {
static std::map<std::string, HashFile*> hashfiles;
auto it = hashfiles.find(path);
if (it == hashfiles.end()) {
it = hashfiles.insert(it, {path, readHashFile(path, err)});
}
return it->second;
}
std::vector<std::string> lookup(const std::string& fqName) const {
auto it = hashes.find(fqName);
if (it == hashes.end()) {
return {};
}
return it->second;
}
private:
static HashFile* readHashFile(const std::string& path, std::string* err) {
std::ifstream stream(path);
if (!stream) {
return nullptr;
}
HashFile* file = new HashFile();
file->path = path;
std::string line;
while (std::getline(stream, line)) {
std::smatch match;
bool valid = std::regex_match(line, match, kHashLine);
if (!valid) {
*err = "Error reading line from " + path + ": " + line;
delete file;
return nullptr;
}
CHECK_EQ(match.size(), 3u);
std::string hash = match.str(1);
std::string fqName = match.str(2);
if (hash.size() == 0 && fqName.size() == 0) {
continue;
}
if (hash.size() == 0 || fqName.size() == 0) {
*err = "Hash or fqName empty on " + path + ": " + line;
delete file;
return nullptr;
}
file->hashes[fqName].push_back(hash);
}
return file;
}
std::string path;
std::map<std::string, std::vector<std::string>> hashes;
};
std::vector<std::string> Hash::lookupHash(const std::string& path, const std::string& interfaceName,
std::string* err, bool* fileExists) {
*err = "";
const HashFile* file = HashFile::parse(path, err);
if (file == nullptr || err->size() > 0) {
if (fileExists != nullptr) *fileExists = false;
return {};
}
if (fileExists != nullptr) *fileExists = true;
return file->lookup(interfaceName);
}
} // namespace android
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