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/*
* This file is part of Maple <https://github.com/gemrest/maple>.
* Copyright (C) 2022-2022 Fuwn <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright (C) 2022-2022 Fuwn <[email protected]>
* SPDX-License-Identifier: GPL-3.0-only
*/
#include <arpa/inet.h>
#include <csignal>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <sys/socket.h>
#include <unistd.h>
#include <vector>
static int maple_socket;
static SSL_CTX *ssl_context;
auto handle_shutdown(int) -> void;
auto main() -> int {
sockaddr_in socket_address {};
std::vector<std::string> gemini_files;
// Try a graceful shutdown when a SIGINT is detected
signal(SIGINT, handle_shutdown);
// Find and keep track of all Gemini files to serve
for (const auto &entry :
std::filesystem::recursive_directory_iterator(".maple/gmi")) {
std::string file_extension = entry.path().string().substr(
entry.path().string().find_last_of('.') + 1
);
std::string gemini_file_extension = "gmi";
// Only keep track of file if it is a Gemini file
if (std::equal(
file_extension.begin(),
file_extension.end(),
gemini_file_extension.begin(),
gemini_file_extension.end(),
[](auto a, auto b) {
return std::tolower(a) == std::tolower(b);
}
)) {
gemini_files.push_back(entry.path());
}
}
// Inform user of which files will be served
for (const auto &file : gemini_files) {
std::cout << "serving " << file << std::endl;
}
// Setup OpenSSL
SSL_library_init();
SSL_load_error_strings();
ssl_context = SSL_CTX_new(TLS_server_method());
if (!ssl_context) {
perror("unable to create ssl context");
ERR_print_errors_fp(stderr);
std::exit(EXIT_FAILURE);
}
if (SSL_CTX_use_certificate_file(
ssl_context,
".maple/public.pem",
SSL_FILETYPE_PEM
) <= 0) {
perror("unable to use certificate file");
ERR_print_errors_fp(stderr);
std::exit(EXIT_FAILURE);
}
if (SSL_CTX_use_PrivateKey_file(
ssl_context,
".maple/private.pem",
SSL_FILETYPE_PEM
) <= 0) {
perror("unable to use private key file");
ERR_print_errors_fp(stderr);
std::exit(EXIT_FAILURE);
}
socket_address.sin_family = AF_INET;
socket_address.sin_port = htons(1965);
socket_address.sin_addr.s_addr = htonl(INADDR_ANY);
maple_socket = socket(AF_INET, SOCK_STREAM, 0);
if (maple_socket < 0) {
perror("unable to create socket");
std::exit(EXIT_FAILURE);
}
// Reuse address. Allows the use of the address instantly after a SIGINT
// without having to wait for the socket to die.
int reuse_addr = 1;
if (setsockopt(
maple_socket,
SOL_SOCKET,
SO_REUSEADDR,
&reuse_addr,
sizeof(int)
) < 0) {
perror("unable to set socket options (SO_LINGER)");
std::exit(EXIT_FAILURE);
}
if (bind(
maple_socket,
reinterpret_cast<sockaddr *>(&socket_address),
sizeof(socket_address)
) < 0) {
perror("unable to bind");
std::exit(EXIT_FAILURE);
}
if (listen(maple_socket, 1) < 0) {
perror("unable to listen");
std::exit(EXIT_FAILURE);
}
// Listen and serve connections
for (;;) {
sockaddr_in socket_address_ {};
unsigned int socket_address_length = sizeof(socket_address_);
SSL *ssl;
int client = accept(
maple_socket,
reinterpret_cast<sockaddr *>(&socket_address_),
&socket_address_length
);
char request[1024];
if (client < 0) {
perror("unable to accept");
std::exit(EXIT_FAILURE);
}
ssl = SSL_new(ssl_context);
SSL_set_fd(ssl, client);
if (SSL_accept(ssl) <= 0) {
ERR_print_errors_fp(stderr);
} else {
std::stringstream response;
size_t index_of_junk;
SSL_read(ssl, request, sizeof(request));
std::string path(request);
path = path.substr(0, path.size() - 2); // Remove "\r\n"
path.erase(0, 9); // Remove "gemini://"
path = path.substr(
path.find_first_of('/'),
path.size() - 1
); // Remove host
// Remove junk, if any
index_of_junk = path.find_first_of('\n');
if (index_of_junk != std::string::npos) {
path.erase(
path.find_first_of('\n') - 1,
path.size() - 1
);
}
// Check if the route is a file being served
if (std::find(
gemini_files.begin(),
gemini_files.end(),
".maple/gmi" + path
) != gemini_files.end()) {
// If the route is a file being served; get the file contents
std::ifstream file(".maple/gmi" + path);
std::stringstream buffer;
buffer << file.rdbuf();
response << "20 text/gemini\r\n" << buffer.str();
} else {
response << "51 The server (Maple) could not find the specified file.\r\n";
}
std::cout << "requested " << path << std::endl;
SSL_write(ssl, response.str().c_str(), static_cast<int>(response.str().size()));
}
SSL_shutdown(ssl);
SSL_free(ssl);
close(client);
}
}
auto handle_shutdown(int signal) -> void {
std::cout << "shutdown(" << signal << ")" << std::endl;
close(maple_socket);
SSL_CTX_free(ssl_context);
}
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