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// Copyright (C) 2024-2025 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <exceptions/exceptions.h>
#include <util/filesystem.h>
#include <fuzz.h>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <fstream>
#include <iostream>
#include <list>
#include <memory>
#include <sstream>
#include <vector>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
using namespace isc;
using namespace isc::util::file;
using namespace std;
int
main(int, char* argv[]) {
int const return_code(LLVMFuzzerInitialize());
assert(return_code == 0);
// Determine some paths.
Path const this_binary(argv[0]);
string ancestor_path(this_binary.parentPath());
string const filename(this_binary.filename());
stringstream ss;
ss << ancestor_path << "/input/" << filename;
Path const p(ss.str());
// Print start header.
if (isatty(fileno(stdin))) {
cout << "\033[92m[ RUN ]\033[0m " << filename << endl;
} else {
cout << "[ RUN ] " << filename << endl;
}
int exit_code(0);
string directory(p.str());
if (exists(directory)) {
// Recursively take all regular files as input.
list<string> files;
struct dirent *dp;
DIR *dfd(opendir(directory.c_str()));
if (!dfd) {
isc_throw(Unexpected, "opendir failed " << directory << ": " << strerror(errno));
}
std::unique_ptr<DIR, void(*)(DIR*)> defer(dfd, [](DIR* d) { closedir(d); });
while ((dp = readdir(dfd)) != nullptr) {
string file(dp->d_name);
if (file == "." || file == "..") {
continue;
}
string entry(directory + '/' + dp->d_name);
if (!isFile(entry)) {
continue;
}
// Save file names.
files.push_back(entry);
}
// Sort the file names so that the order is the same each time.
files.sort();
for (string& f : files) {
// Read content from file.
ifstream file(f, ios::binary);
if (!file.is_open()) {
cerr << "ERROR: could not open file " << f << endl;
return 1;
}
// Get the file size.
file.seekg(0, std::ios::end);
streampos const bytes(file.tellg());
file.seekg(0, std::ios::beg);
// Read the entire file into a vector.
vector<uint8_t> buffer(bytes);
file.read(reinterpret_cast<char*>(buffer.data()), bytes);
file.close();
// Fuzz.
f.replace(f.find(ancestor_path), ancestor_path.size() + 1, string());
cout << "Fuzzing with " << bytes << " byte" << (bytes == 1 ? string() : "s") << " read from "
<< f << "..." << endl;
exit_code |= LLVMFuzzerTestOneInput(buffer.data(), bytes);
}
} else {
// Read input from stdin.
cout << "Waiting on input..." << endl;
vector<uint8_t> buffer(65536);
size_t const bytes(fread(&buffer[0], sizeof(buffer[0]), buffer.size(), stdin));
// Fuzz.
cout << "Fuzzing with " << bytes << " byte" << (bytes == 1 ? "" : "s")
<< " read from stdin..." << endl;
exit_code |= LLVMFuzzerTestOneInput(buffer.data(), bytes);
}
// Tear down the setup.
LLVMFuzzerTearDown();
// Print end header.
string const result(exit_code == 0 ? " OK " : " FAILED ");
if (isatty(fileno(stdin))) {
cout << "\033[92m[" << result << "]\033[0m " << filename << endl;
} else {
cout << "[" << result << "] " << filename << endl;
}
return exit_code;
}
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