pmb
35d0f21051
Stdout works in both contexts: docker logs captures it directly, and on FreeBSD daemon(8) / the Bastille jail rc script can redirect or pipe it to syslog as needed. Going through syslog from inside the daemon required openlog/closelog and a libc dependency that broke portability with no real benefit.
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
#include <iostream>
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#include <boost/asio/co_spawn.hpp>
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#include <boost/asio/deferred.hpp>
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#include <boost/asio/detached.hpp>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/ip/tcp.hpp>
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#include <boost/asio/signal_set.hpp>
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#include <boost/asio/write.hpp>
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#include <cstdio>
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#include "handler.hpp"
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using boost::asio::awaitable;
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using boost::asio::co_spawn;
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using boost::asio::deferred;
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using boost::asio::detached;
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using boost::asio::ip::tcp;
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namespace this_coro = boost::asio::this_coro;
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awaitable<std::string> dofinger(const std::string &username) {
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co_return process(username);
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}
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awaitable<void> echo(tcp::socket socket, std::string client_addr) {
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try {
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char data[1024];
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auto bytes_read =
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co_await socket.async_read_some(boost::asio::buffer(data), deferred);
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std::string username(data, bytes_read);
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// Remove trailing \r\n characters
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while (!username.empty() &&
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(username.back() == '\r' || username.back() == '\n')) {
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username.pop_back();
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}
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std::printf("finger request from %s for user '%s'\n",
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client_addr.c_str(), username.c_str());
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auto response = co_await dofinger(username);
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if (response.compare(std::string(username)) == 0) {
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// No plan found
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co_await async_write(
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socket, boost::asio::buffer(std::string("No plan found\r\n")),
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deferred);
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co_return;
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}
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co_await async_write(socket, boost::asio::buffer(response), deferred);
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co_return;
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} catch (std::exception &e) {
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std::printf("echo exception: %s\n", e.what());
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}
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}
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awaitable<void> listener() {
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auto executor = co_await this_coro::executor;
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tcp::acceptor acceptor(executor, {tcp::v4(), 79});
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for (;;) {
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tcp::socket socket = co_await acceptor.async_accept(deferred);
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boost::system::error_code ec;
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auto endpoint = socket.remote_endpoint(ec);
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std::string client_addr =
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ec ? std::string("unknown") : endpoint.address().to_string();
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co_spawn(executor, echo(std::move(socket), std::move(client_addr)),
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detached);
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}
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}
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int main() {
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// Line-buffer stdout so docker logs / tail -f see entries in real time.
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std::setvbuf(stdout, nullptr, _IOLBF, 0);
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try {
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boost::asio::io_context io_context(1);
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boost::asio::signal_set signals(io_context, SIGINT, SIGTERM);
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signals.async_wait([&](auto, auto) { io_context.stop(); });
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co_spawn(io_context, listener(), detached);
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io_context.run();
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} catch (std::exception &e) {
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std::printf("fatal exception: %s\n", e.what());
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}
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}
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