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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Client.h"
#include <AK/ByteBuffer.h>
#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/EventLoop.h>
#include <LibCore/TCPServer.h>
#include <LibCore/TCPSocket.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
static void run_command(int ptm_fd, String command)
{
pid_t pid = fork();
if (pid == 0) {
const char* tty_name = ptsname(ptm_fd);
if (!tty_name) {
perror("ptsname");
exit(1);
}
close(ptm_fd);
int pts_fd = open(tty_name, O_RDWR);
if (pts_fd < 0) {
perror("open");
exit(1);
}
// NOTE: It's okay if this fails.
[[maybe_unused]] auto rc = ioctl(0, TIOCNOTTY);
close(0);
close(1);
close(2);
rc = dup2(pts_fd, 0);
if (rc < 0) {
perror("dup2");
exit(1);
}
rc = dup2(pts_fd, 1);
if (rc < 0) {
perror("dup2");
exit(1);
}
rc = dup2(pts_fd, 2);
if (rc < 0) {
perror("dup2");
exit(1);
}
rc = close(pts_fd);
if (rc < 0) {
perror("close");
exit(1);
}
rc = ioctl(0, TIOCSCTTY);
if (rc < 0) {
perror("ioctl(TIOCSCTTY)");
exit(1);
}
const char* args[4] = { "/bin/Shell", nullptr, nullptr, nullptr };
if (!command.is_empty()) {
args[1] = "-c";
args[2] = command.characters();
}
const char* envs[] = { "TERM=xterm", "PATH=/bin:/usr/bin:/usr/local/bin", nullptr };
rc = execve("/bin/Shell", const_cast<char**>(args), const_cast<char**>(envs));
if (rc < 0) {
perror("execve");
exit(1);
}
VERIFY_NOT_REACHED();
}
}
int main(int argc, char** argv)
{
int port = 23;
const char* command = "";
Core::ArgsParser args_parser;
args_parser.add_option(port, "Port to listen on", nullptr, 'p', "port");
args_parser.add_option(command, "Program to run on connection", nullptr, 'c', "command");
args_parser.parse(argc, argv);
if ((u16)port != port) {
warnln("Invalid port number: {}", port);
exit(1);
}
Core::EventLoop event_loop;
auto server = Core::TCPServer::construct();
if (!server->listen({}, port)) {
warnln("Listening on 0.0.0.0:{} failed", port);
exit(1);
}
HashMap<int, NonnullRefPtr<Client>> clients;
int next_id = 0;
server->on_ready_to_accept = [&next_id, &clients, &server, command] {
int id = next_id++;
auto client_socket = server->accept();
if (!client_socket) {
perror("accept");
return;
}
int ptm_fd = posix_openpt(O_RDWR);
if (ptm_fd < 0) {
perror("posix_openpt");
client_socket->close();
return;
}
if (grantpt(ptm_fd) < 0) {
perror("grantpt");
client_socket->close();
return;
}
if (unlockpt(ptm_fd) < 0) {
perror("unlockpt");
client_socket->close();
return;
}
run_command(ptm_fd, command);
auto client = Client::create(id, move(client_socket), ptm_fd);
client->on_exit = [&clients, id] { clients.remove(id); };
clients.set(id, client);
};
int rc = event_loop.exec();
if (rc != 0) {
fprintf(stderr, "event loop exited badly; rc=%d", rc);
exit(1);
}
return 0;
}
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