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server.cpp
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server.cpp
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#ifndef server_hpp
#define server_hpp
#include "HTTP.hpp"
#include "HTTP.cpp"
#include <string.h>
#include <stdio.h>
// port used
#define PORT 2024
// buffer size
#define RESPONSE_BUFFER 8192
#define RECEIVE_BUFFER 4096
/* FUNCTIONS */
int starting_server(int &socket_descriptor, struct sockaddr_in &server, struct sockaddr_in &from);
void service(int &socket_descriptor, struct sockaddr_in &server, struct sockaddr_in &from);
void request_header_parser(char &message, Request &request);
short int request_parser(Request &request, Session &session);
bool send_response(Request &request, Session &session);
bool connect_session(int client, SSL *ssl);
void init_openssl();
void cleanup_openssl();
SSL_CTX *create_context();
void configure_context(SSL_CTX *ctx);
/*------------------------------- PREPARING AND STARTING SERVER (BEGIN) ------------------------------- */
int starting_server(int &socket_descriptor, struct sockaddr_in &server, struct sockaddr_in &from)
{
init_openssl(); //initializare openssl
//crearea socketului
if ((socket_descriptor = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("Error raised by socket().\n");
return errno;
}
//pregatirea structurile de date
bzero(&server, sizeof(server));
bzero(&from, sizeof(from));
server.sin_family = AF_INET;
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_port = (short)htons(PORT);
//atasarea socketului
if (bind(socket_descriptor, (struct sockaddr *)&server, sizeof(struct sockaddr)) == -1)
{
perror("Error raised by bind().\n");
return errno;
}
//serverul incepe sa astepte clienti
if (listen(socket_descriptor, 100) == -1)
{
perror("Error raised by listen().\n");
return errno;
}
return 0;
}
/*------------------------------- PREPARING AND STARTING SERVER (END) ------------------------------- */
/*------------------------------- SERVER'S MAIN SERVICE (BEGIN) ------------------------------- */
void service(int &socket_descriptor, struct sockaddr_in &server, struct sockaddr_in &from)
{
SSL_CTX *ctx;
ctx = create_context();
configure_context(ctx);
while (1)
{
int client;
socklen_t length = sizeof(from);
std::cout << "Waiting on port: " << PORT << std::endl;
client = accept(socket_descriptor, (struct sockaddr *)&from, &length);
if (client < 0)
{
perror("Error raised by accept().\n");
continue;
}
SSL *ssl = SSL_new(ctx);
SSL_set_fd(ssl, client);
if (SSL_accept(ssl) <= 0)
{
std::cout << "Error accept();\n";
ERR_print_errors_fp(stderr);
continue;
}
std::thread serv(connect_session, client, ssl);
serv.detach();
}
}
/*------------------------------- SERVER'S MAIN SERVICE (END) ------------------------------- */
/*------------------------------- STARTING A CONNECTION SESSION (BEGIN) ------------------------------- */
bool connect_session(int client, SSL *ssl)
{
Request request;
Session session(ssl);
while (1)
{
if (session.get_login_status())
{
std::cout << "User with ID " << session.get_user_id() << " is connected\n";
}
else
{
std::cout << "This connection is not linked to any user\n";
}
bool request_parser_return = request_parser(request, session);
std::cout << "request parser returned " << request_parser_return << '\n';
if (request_parser_return != 0)
{
std::cout << std::endl;
SSL_free(ssl);
close(client);
return 1;
}
if (send_response(request, session) == 1)
{
SSL_free(ssl);
close(client);
return 1;
}
if (request.request_options["Connection"] != " keep-alive")
{
std::cout << "Browser doesn't support keep-alive protocol.\n";
break;
}
}
std::cout << "Connection ended due to keep-alive protocol unssuported.\n";
SSL_free(ssl);
close(client);
return 0;
}
/*------------------------------- STARTING A CONNECTION SESSION (END) ------------------------------- */
/*------------------------------- HTTP REQUEST PARSER (BEGIN) ------------------------------- */
short int request_parser(Request &request, Session &session)
{
char message[RECEIVE_BUFFER];
bzero(message, RECEIVE_BUFFER);
std::cout << "Waiting for message" << std::endl;
int ssl_return = SSL_read(session.ssl, message, RECEIVE_BUFFER);
if (ssl_return <= 0)
{
perror("Error raised by read() from client (client dissconeccted).\n");
return -1;
}
request.advanced_message_parser(message);
std::cout << request.method << '\n';
std::cout << request.URI << '\n';
std::cout << request.query << '\n';
std::cout << request.version << '\n';
request.show_options();
std::cout << request.content << '\n';
return 0;
}
/*------------------------------- HTTP REQUEST PARSER (END) ------------------------------- */
/*------------------------------- HTTP SEND RESPONSE (START) ------------------------------- */
bool send_response(Request &request, Session &session)
{
if (request.method == "GET")
{
GET_method(request, session);
}
else if (request.method == "POST")
{
POST_method(request, session);
}
return 0;
}
/*------------------------------- HTTP SEND RESPONSE (END) ------------------------------- */
/*------------------------------- SSL (START) ------------------------------- */
void init_openssl()
{
SSL_load_error_strings();
OpenSSL_add_ssl_algorithms();
}
void cleanup_openssl()
{
EVP_cleanup();
}
SSL_CTX *create_context()
{
const SSL_METHOD *method;
SSL_CTX *ctx;
method = SSLv23_server_method();
ctx = SSL_CTX_new(method);
if (!ctx)
{
perror("Unable to create SSL context");
ERR_print_errors_fp(stderr);
exit(EXIT_FAILURE);
}
return ctx;
}
void configure_context(SSL_CTX *ctx)
{
SSL_CTX_set_ecdh_auto(ctx, 1);
/* Set the key and cert */
if (SSL_CTX_use_certificate_file(ctx, "cert.pem", SSL_FILETYPE_PEM) < 0)
{
ERR_print_errors_fp(stderr);
exit(EXIT_FAILURE);
}
if (SSL_CTX_use_PrivateKey_file(ctx, "key.pem", SSL_FILETYPE_PEM) < 0)
{
ERR_print_errors_fp(stderr);
exit(EXIT_FAILURE);
}
}
/*------------------------------- SSL (END) ------------------------------- */
#endif /* server_hpp */