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/** Created by crupest.
* This is the server program.
*/
#include <cstdlib>
#include <ios>
#include <iostream>
#include <mutex>
#include <optional>
#include <string>
#include <string_view>
#include <thread>
#include <Windows.h>
#include <winsock.h>
#pragma comment(lib, "Ws2_32.lib")
const auto bind_address = "127.0.0.1"; // control bind address
const u_short port = 1234; // control bind port
// As far as I know, cout is not thread safe. So we need a lock. But this might
// not be the best solution. We can use a queue instead to avoid block.
std::mutex cout_mutex;
[[noreturn]] void
PrintErrorMessageAndExit(std::wstring_view message,
std::optional<int> error_code = std::nullopt) {
std::wcerr << message << L'\n';
if (error_code) {
std::cerr << L"Error code is " << std::hex << *error_code << L'\n';
wchar_t buffer[500];
if (!FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_ARGUMENT_ARRAY |
FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, *error_code, 0, buffer, 500, nullptr)) {
std::wcerr << L"Failed to format error message.\n";
} else {
std::wcerr << buffer << L'\n';
}
}
WSACleanup();
std::exit(1);
}
void ResponseThreadProc(int socket, sockaddr_in address) {
auto address_string = inet_ntoa(address.sin_addr);
{
std::lock_guard<std::mutex> guard(cout_mutex);
std::cout << "Connected to " << address_string << "!\n";
}
const std::string_view buffer = "Love you!!! By crupest!";
const int total_byte_count = buffer.size();
int byte_count_sent = 0;
int retry_count = 0;
while (true) {
// Now we have sent all data.
if (byte_count_sent == total_byte_count)
break;
auto byte_actually_sent = send(socket, buffer.data() + byte_count_sent,
buffer.size() - byte_count_sent, 0);
// send failed
if (byte_actually_sent == SOCKET_ERROR) {
std::lock_guard<std::mutex> guard(cout_mutex);
std::cerr << "Failed to send!\n";
closesocket(socket);
break;
}
byte_count_sent += byte_actually_sent;
}
{
std::lock_guard<std::mutex> guard(cout_mutex);
std::cout << "Succeeded to send message to " << address_string << "!\n";
}
}
int main() {
WSADATA wsa_data;
if (WSAStartup(MAKEWORD(2, 2), &wsa_data)) { // initialize wsa
PrintErrorMessageAndExit(L"Failed to initialize wsa.", WSAGetLastError());
}
int server_socket;
if ((server_socket = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
PrintErrorMessageAndExit(L"Failed to create socket.", WSAGetLastError());
}
sockaddr_in server_address;
server_address.sin_family = AF_INET;
server_address.sin_port = htons(port);
server_address.sin_addr.s_addr = inet_addr(bind_address);
memset(&(server_address.sin_zero), 0, sizeof(server_address.sin_zero));
if (bind(server_socket, reinterpret_cast<sockaddr *>(&server_address),
sizeof(sockaddr_in)) == SOCKET_ERROR) {
PrintErrorMessageAndExit(L"Failed to bind.", WSAGetLastError());
}
if (listen(server_socket, SOMAXCONN) == SOCKET_ERROR) {
PrintErrorMessageAndExit(L"Failed to listen.", WSAGetLastError());
}
while (true) {
sockaddr_in client_address;
int client_socket;
int sin_size = sizeof(sockaddr_in);
client_socket =
accept(server_socket, reinterpret_cast<sockaddr *>(&client_address),
&sin_size);
if (client_socket == INVALID_SOCKET) {
PrintErrorMessageAndExit(L"Failed to accecpt", WSAGetLastError());
}
std::thread response_thread(ResponseThreadProc, client_socket,
client_address);
response_thread.detach();
}
}
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