socket/socketio_win32.cpp

#include "socketio.hpp"
#include <stdio.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib")
#include <string>
#include <cstring>
#include <vector>
#include <iostream>

using std::size_t;
struct socket_exception : public std::exception{
	std::string msg;
	socket_exception(std::string&& _msg){
		msg = std::move(_msg);
	}
	socket_exception(const std::string& _msg){
		msg = _msg;
	}
	socket_exception(const char* _msg){
		msg = std::string(_msg);
	}
	const char* what() const throw (){
		//return "asdasdsa";
    	return msg.length() == 0 ? "Connection creation failure" : msg.c_str();
    }
};

std::string GetLastErrorAsString(){
    //Get the error message, if any.
    DWORD errorMessageID = ::GetLastError();
    if(errorMessageID == 0)
        return std::string();

    LPSTR messageBuffer = nullptr;
    size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
                                 NULL, errorMessageID, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&messageBuffer, 0, NULL);

    std::string message(messageBuffer, size);

    //Free the buffer.
    LocalFree(messageBuffer);

    return message;
}

cppsocket::cppsocket(){}
cppsocket::cppsocket(WSADATA d, SOCKET _s){
	s = _s;
	wsa = d;
	buffer = std::vector<char>(buffersize);
}
cppsocket::cppsocket(const std::string& addr, unsigned int PORT){
	struct sockaddr_in server;
	buffer = std::vector<char>(buffersize);
	int recv_size;
	
	if (WSAStartup(MAKEWORD(2,2),&wsa) != 0){
		throw socket_exception(std::string("Socket creation error: ") + GetLastErrorAsString());
	}
	
	if((s = socket(AF_INET , SOCK_STREAM , 0 )) == INVALID_SOCKET){
		throw socket_exception(std::string("Socket creation error: ") + GetLastErrorAsString());
	}
	
	server.sin_addr.s_addr = inet_addr(addr.c_str());
	server.sin_family = AF_INET;
	server.sin_port = htons(PORT);

	if (connect(s , (struct sockaddr *)&server , sizeof(server)) < 0){
		throw socket_exception(std::string("Could not connect to host: ") + GetLastErrorAsString());
	}
}
void cppsocket::write(const std::string& message){
	std::vector<char> msg(message.c_str(), message.c_str() + message.size());
	write(msg);
}
void cppsocket::write(const std::vector<char>& message){
	for(size_t i = 0;i < message.size();i += buffersize){
		char cs[buffersize + 1] = {0};
		std::memcpy(cs, message.data() + i,buffersize);
		if((i + buffersize) < message.size()){
			cs[buffersize] = 'c';
			if(send(s, cs, buffersize + 1, 0) < 0){
				throw socket_exception(std::string("Couldn't write to peer: ") + GetLastErrorAsString());
			}
		}
		else{
			cs[message.size() - i] = (char)0;
			if(send(s, cs, message.size() - i, 0) < 0){
				throw socket_exception(std::string("Couldn't write to peer: ") + GetLastErrorAsString());
			}
		}
	}
}
std::vector<char> cppsocket::receive(){
	std::vector<char> stor;
	while(true){
		std::fill(buffer.begin(), buffer.end(), (char)0);
		ssize_t val = recv(s, buffer.data(), buffersize + 1,0);
		if(val == 0)throw socket_exception("Connection closed by peer");
		if(val < 0){
			throw socket_exception(GetLastErrorAsString());
		}
		stor.insert(stor.end(), buffer.begin(), buffer.begin() + std::min(val, (ssize_t)buffersize));
		if(buffer.data()[buffersize] == (char)0){break;}
	}
	std::cout << std::endl;
	return stor;
}
void cppsocket::close(){
	closesocket(s);
}

server_socket::server_socket(int port){
	struct addrinfo *result = NULL;
	struct addrinfo hints;
	iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
	if (iResult != 0) {
		printf("WSAStartup failed with error: %d\n", iResult);
	}
	ZeroMemory(&hints, sizeof(hints));
	hints.ai_family = AF_INET;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;
	hints.ai_flags = AI_PASSIVE;

	// Resolve the server address and port
	iResult = getaddrinfo(NULL, std::to_string(port).c_str(), &hints, &result);
	if ( iResult != 0 ) {
		printf("getaddrinfo failed with error: %d\n", iResult);
		WSACleanup();
	}

	// Create a SOCKET for connecting to server
	ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
	if (ListenSocket == INVALID_SOCKET) {
		printf("socket failed with error: %ld\n", WSAGetLastError());
		freeaddrinfo(result);
		WSACleanup();
	}

	// Setup the TCP listening socket
	iResult = bind( ListenSocket, result->ai_addr, (int)result->ai_addrlen);
	if (iResult == SOCKET_ERROR) {
		printf("bind failed with error: %d\n", WSAGetLastError());
		freeaddrinfo(result);
		closesocket(ListenSocket);
		WSACleanup();
	}
	freeaddrinfo(result);
	iResult = listen(ListenSocket, SOMAXCONN);
	if (iResult == SOCKET_ERROR) {
		printf("listen failed with error: %d\n", WSAGetLastError());
		closesocket(ListenSocket);
		WSACleanup();
	}
}
cppsocket server_socket::accept_connection(){
	SOCKET ClientSocket = accept(ListenSocket, NULL, NULL);
	if (ClientSocket == INVALID_SOCKET) {
		printf("accept failed with error: %d\n", WSAGetLastError());
		closesocket(ListenSocket);
		WSACleanup();
	}
	return cppsocket(wsaData, ClientSocket);
}
void server_socket::close(){
	closesocket(ListenSocket);
}
/*int main(int argc, char** argv){
	server_socket ssock(80);
	while(true){
		cppsocket sock = ssock.accept_connection();
		sock.write("ab");
		std::vector<char> rec = sock.receive();
		std::cout << rec << ", ";
		std::cout << rec << std::endl;
		sock.close();
	}
	ssock.close();
	
	//Send some data
	std::string _message = std::string("Hallo");
	memcpy(message, _message.c_str(), _message.length() + 1);
	if( send(s , message , strlen(message) , 0) < 0){
		puts("Send failed");
		return 1;
	}
	puts("Data Send\n");
	
	//Receive a reply from the server
	if((recv_size = recv(s , server_reply , 2000 , 0)) == SOCKET_ERROR){
		puts("recv failed");
	}
	
	puts("Reply received\n");
	
	//Add a NULL terminating character to make it a proper string before printing
	server_reply[recv_size] = '\0';
	puts(server_reply);
	
	return 0;
}*/