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use chrono::offset::Local;
use futures_util::future::try_join;
use http::uri::Uri;
use hyper::service::{make_service_fn, service_fn};
use hyper::upgrade::Upgraded;
use hyper::{Body, Client, Method, Request, Response, Server};
use regex::Regex;
use serde::Deserialize;
use serde_dhall::StaticType;
use std::convert::Infallible;
use std::net::SocketAddr;
use structopt::StructOpt;
use tokio::net::TcpStream;
#[macro_use]
extern crate log;
type HttpClient = Client<hyper::client::HttpConnector>;
#[derive(Debug, StructOpt)]
#[structopt()]
struct Opt {
#[structopt(short, long)]
config: String,
}
#[derive(Debug, Deserialize, StaticType, Clone)]
struct Access {
from: String,
to: String,
hosts: Vec<String>,
}
#[tokio::main]
async fn main() {
env_logger::from_env(env_logger::Env::default().default_filter_or("info")).init();
let opt = Opt::from_args();
match serde_dhall::from_file(opt.config)
.static_type_annotation()
.parse::<Vec<Access>>()
{
Ok(config) => {
let addr = SocketAddr::from(([127, 0, 0, 1], 8100));
let client = HttpClient::new();
let make_service = make_service_fn(move |_| {
let config = config.clone();
let client = client.clone();
async move {
Ok::<_, Infallible>(service_fn(move |req| {
proxy(config.clone(), client.clone(), req)
}))
}
});
let server = Server::bind(&addr).serve(make_service);
info!("Listening on http://{}", addr);
if let Err(e) = server.await {
error!("server error: {}", e);
}
}
Err(err) => error!("{}", err),
}
}
async fn proxy(
config: Vec<Access>,
client: HttpClient,
req: Request<Body>,
) -> Result<Response<Body>, hyper::Error> {
debug!("req: {:?}", req);
let uri = req.uri();
let unauthorized_hosts = currently_unauthorized_hosts(config);
if block_uri(&unauthorized_hosts, uri) {
info!("Blocked: {:?}", uri);
Ok(Response::new(Body::empty()))
} else {
info!("Authorized: {:?}", uri);
if req.method() == Method::CONNECT {
if let Some(addr) = host_addr(uri) {
tokio::task::spawn(async move {
match req.into_body().on_upgrade().await {
Ok(upgraded) => {
if let Err(e) = tunnel(upgraded, &addr).await {
warn!("server io error: {}", e);
};
}
Err(e) => error!("upgrade error: {}", e),
}
});
Ok(Response::new(Body::empty()))
} else {
error!("CONNECT host is not socket addr: {:?}", uri);
let mut resp = Response::new(Body::from("CONNECT must be to a socket address"));
*resp.status_mut() = http::StatusCode::BAD_REQUEST;
Ok(resp)
}
} else {
client.request(req).await
}
}
}
fn host_addr(uri: &http::Uri) -> Option<String> {
uri.authority().map(|auth| auth.as_str().to_string())
}
// Create a TCP connection to host:port, build a tunnel between the connection and
// the upgraded connection
async fn tunnel(upgraded: Upgraded, addr: &str) -> std::io::Result<()> {
// Connect to remote server
let mut server = TcpStream::connect(addr).await?;
// Proxying data
let amounts = {
let (mut server_rd, mut server_wr) = server.split();
let (mut client_rd, mut client_wr) = tokio::io::split(upgraded);
let client_to_server = tokio::io::copy(&mut client_rd, &mut server_wr);
let server_to_client = tokio::io::copy(&mut server_rd, &mut client_wr);
try_join(client_to_server, server_to_client).await
};
match amounts {
Ok((from_client, from_server)) => {
debug!(
"client wrote {} bytes and received {} bytes",
from_client, from_server
);
}
Err(e) => {
warn!("tunnel error: {}", e);
}
};
Ok(())
}
fn block_uri(unauthorized_hosts: &Vec<String>, uri: &Uri) -> bool {
match uri.host() {
Some(h) => unauthorized_hosts
.iter()
.find(|unauthorized_host| h.contains(*unauthorized_host))
.is_some(),
None => false,
}
}
fn currently_unauthorized_hosts(config: Vec<Access>) -> Vec<String> {
let now = Local::now();
let hour = now.format("%H").to_string().parse::<i32>().unwrap();
let minutes = now.format("%M").to_string().parse::<i32>().unwrap();
let now = (hour, minutes);
config
.into_iter()
.map(|access| {
let from = parse_time(&access.from);
let to = parse_time(&access.to);
if is_before_or_eq(from, to) {
if is_after_or_eq(now, from) && is_before_or_eq(now, to) {
access.hosts.clone()
} else {
Vec::new()
}
} else {
if is_after_or_eq(now, from) || is_before_or_eq(now, to) {
access.hosts.clone()
} else {
Vec::new()
}
}
})
.collect::<Vec<Vec<String>>>()
.concat()
}
fn parse_time(str: &str) -> (i32, i32) {
let regex = Regex::new(r"(\d{2}):(\d{2})").unwrap();
match regex.captures(str) {
Some(cap) => (cap[1].parse().unwrap(), cap[2].parse().unwrap()),
None => panic!("Error while parsing time: {}", str),
}
}
fn is_before_or_eq(t1: (i32, i32), t2: (i32, i32)) -> bool {
t1.0 < t2.0 || t1.0 == t2.0 && t1.1 <= t2.1
}
fn is_after_or_eq(t1: (i32, i32), t2: (i32, i32)) -> bool {
is_before_or_eq(t2, t1)
}
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