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/*
* Copyright (C) 2021 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 <getopt.h>
#include <stdlib.h>
#include <sysexits.h>
#include <cstdlib>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <optional>
#include <sstream>
#include <google/protobuf/util/delimited_message_util.h>
#include "interceptor.h"
namespace fs = std::filesystem;
struct Options {
std::string command_line;
std::optional<fs::path> command_log;
};
static Options parse_args(int argc, char* argv[]) {
Options result;
while (1) {
static struct option long_options[] = {{"command-log", required_argument, 0, 'l'},
{0, 0, 0, 0}};
/* getopt_long stores the option index here. */
int option_index = 0;
auto c = getopt_long(argc, argv, "l:", long_options, &option_index);
/* Detect the end of the options. */
if (c == -1) break;
switch (c) {
case 'l':
result.command_log = fs::absolute(optarg);
break;
case '?':
/* getopt_long already printed an error message. */
break;
default:
abort();
}
}
std::stringstream ss;
if (optind < argc) {
while (optind < argc) {
ss << argv[optind++];
ss << ' ';
}
}
result.command_line = ss.str();
return result;
}
static void setup_interceptor_library_path() {
auto interceptor_library = fs::read_symlink("/proc/self/exe").parent_path().parent_path() /
"lib64" / "libinterceptor.so";
while (fs::is_symlink(interceptor_library))
interceptor_library = fs::read_symlink(interceptor_library);
if (!fs::is_regular_file(interceptor_library)) {
std::cerr << "Interceptor library could not be found!\n";
exit(EX_CONFIG);
}
setenv("LD_PRELOAD", interceptor_library.c_str(), 1);
}
static fs::path setup_root_dir() {
const auto root_dir = getenv("ROOT_DIR");
fs::path result;
if (root_dir != nullptr)
result = root_dir;
else
result = fs::current_path();
setenv(ENV_root_dir, result.c_str(), 1);
return result;
}
class CommandLog {
const decltype(Options::command_log) command_log_file_;
const fs::path root_dir_;
public:
CommandLog(decltype(command_log_file_) command_log_file, const fs::path& root_dir)
: command_log_file_(std::move(command_log_file)), root_dir_(root_dir) {
if (command_log_file_) {
setenv(ENV_command_log, command_log_file_->c_str(), 1);
std::ofstream command_log(command_log_file_->c_str(), std::ios_base::trunc);
if (!command_log) {
std::cerr << "Could not open command log for writing: " << *command_log_file_ << "\n";
exit(EX_CANTCREAT);
}
}
}
~CommandLog() {
if (command_log_file_) {
// compact the log by re-reading the individual log::Message's to combine
// them to a log::Log
interceptor::log::Log log;
log.set_root_dir(root_dir_);
{
std::ifstream command_log(command_log_file_->c_str(), std::ios_base::binary);
google::protobuf::io::IstreamInputStream input_stream(&command_log);
interceptor::log::Message message;
while (true) {
if (!google::protobuf::util::ParseDelimitedFromZeroCopyStream(&message, &input_stream,
nullptr))
break;
if (message.has_command()) log.add_commands()->Swap(message.release_command());
}
}
std::ofstream command_log(command_log_file_->c_str(), std::ios_base::binary);
log.SerializeToOstream(&command_log);
}
}
};
int main(int argc, char* argv[]) {
const auto& options = parse_args(argc, argv);
setup_interceptor_library_path();
const auto root_dir = setup_root_dir();
CommandLog command_log(options.command_log, root_dir);
// TODO: cleanly to google::protobuf::ShutdownProtobufLibrary();
return std::system(options.command_line.c_str());
}
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