Internet checker

internet-check.cpp

#include <array>
#include <regex>
#include <chrono>
#include <thread>
#include <string>
#include <cstdio>
#include <memory>
#include <cstdint>
#include <iostream>
#include <stdexcept>

#define PING_CMD "nc -z fast.com 80"

std::string exec(const char* cmd) {
    std::string result;
    std::array<char, 128> buffer;
    std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);

    if (!pipe) {
        throw std::runtime_error("popen() failed!");
    }

    while (std::fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
        result += buffer.data();
    }

    return result;
}

int main() {

	std::uint64_t counter = 1;
	const std::regex pattern = std::regex{ "nor servname provided" };

	std::cout << "attempt #" << counter << "... ";

	while (std::regex_search(exec(PING_CMD), pattern)) {
		std::cout << " fail\n";
		std::this_thread::sleep_for(std::chrono::milliseconds(750));
		counter += 1;
		std::cout << "atempt #" << counter << "... ";
	}

	std::cout << "success\n";

	return 0;
}

internet-check.py

#!/usr/bin/env python3
import re
import time
import subprocess

PING_CMD = 'nc -z fast.com 80'
ERROR_MSG = re.compile("nor servname provided")


def main():
    counter = 1
    print(f'attempt #{counter}...', end=' ')
    while ERROR_MSG.search(subprocess.getoutput(PING_CMD)):
        print('failed')
        time.sleep(0.75)
        counter += 1
        print(f'attempt #{counter}...', end=' ')
    print('success')


if __name__ == '__main__':
    main()