Winsock Basic HTTP Server C++

winsock_http_server.cpp

/*
HTTP Server from Winsock made from scratch.
Author : Lynx [ Fahad Mustafa ]
Date 18 November 2018

*/


// Nessecary Includes.
#include "pch.h"
#include <iostream>
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <tchar.h>

// Buffer 
#define Buffer 1500
// A Pragma comment. Loading Library 
#pragma comment(lib, "ws2_32.lib")

int main()
{
	// Variables and Declarations
	WSADATA wsa;
	struct sockaddr_in server;
	SOCKET s;
	SOCKET clientS;
	int iResult;
	const char message[Buffer] = "This message being displayed to you in your Browser.\nIs sent from a C++ Winsock HTTP Server.\n Now Closing Connection.\r";
	char reply[Buffer] = { 0 };

	// Simple. Start WSA(Windows Sockets API). If the return answer is not 0. It means error so therefore, 
	if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
		std::cerr << "WinsocK Failed" << std::endl; // Print out this on the Screen.
		getchar(); // Pause Console 
		exit(true); // Exit Program, Note that in Computing, 1 = True, 0 = False. So 0 or 1 can also be entered as, exit(1);
	}

	std::cout << "Windows Socket API Started" << std::endl; // Notifiy user that, WSA (Windows Socket API) has started.

	// Create a Network Socket
	s = socket(AF_INET, SOCK_STREAM, NULL);
	// If the Socket is Invalid or a Socket Error Occurs
	if (s == SOCKET_ERROR) 
	{
		std::cerr << "Socket Error : " << WSAGetLastError() << std::endl;
		getchar(); // Pause Console 
		exit(true); // Exit Program, Note that in Computing, 1 = True, 0 = False. So 0 or 1 can also be entered as, exit(1);
	}
	else if (s == INVALID_SOCKET) {
		std::cerr << "Socket Error : " << WSAGetLastError() << std::endl;
		getchar(); // Pause Console 
		exit(true); // Exit Program, Note that in Computing, 1 = True, 0 = False. So 0 or 1 can also be entered as, exit(1);
	}

	std::cout << "Socket Created" << std::endl;

	server.sin_family = AF_INET; // Using AF_INET Address Family.
	server.sin_port = htons(80); // Defining PORT
	InetPton(AF_INET, _T("0.0.0.0"), &server.sin_addr); // Defining The Network Address to Run the Server on

	iResult = bind(s, (struct sockaddr*)&server, sizeof(server)); // binding the Host Address and Port Number
	if (iResult == SOCKET_ERROR) // If Bind gives Error
	{
		std::cerr << "Bind Error " << WSAGetLastError() << std::endl;
		getchar(); // Pause Console 
		exit(true); // Exit Program, Note that in Computing, 1 = True, 0 = False. So 0 or 1 can also be entered as, exit(1);
	}

	std::cout << "Listening on : 0.0.0.0:80" << std::endl; // Tell the User we Started Listening.
	iResult = listen(s, AF_INET); // Then Actually Start Listening for incoming Connections.

	/* 
	The Program will start to listen for incoming connections and will do so until 
	Someone Connects.
	*/

	clientS = accept(s, NULL, NULL); // Accept a Connection on a new Socket made for the Client.
	if (clientS == SOCKET_ERROR) { // if Accepting Connection is a Error
		std::cerr << "Accept FAiled!" << WSAGetLastError() << std::endl;
		getchar(); // Pause Console 
		exit(true); // Exit Program, Note that in Computing, 1 = True, 0 = False. So 0 or 1 can also be entered as, exit(1);
	}
	else {
		std::cout << "A Client Connected. Sending a Message and closing Connection" << std::endl; // notify user that someone connected
		send(clientS, message, strlen(message), NULL); // Send Client a Message
	}

	recv(clientS, reply, sizeof(reply), NULL); // Just in case if the Client sends something, We Receive it.

	closesocket(clientS); // close the Client Socket now that our Work is Complete.
	WSACleanup(); // Clean Windows Socket API.

	getchar();
    
}