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// -*- coding: utf-8 -*-
//
// Copyright (C) 2024 Michael Büsch <m@bues.ch>
//
// Licensed under the Apache License version 2.0
// or the MIT license, at your option.
// SPDX-License-Identifier: Apache-2.0 OR MIT
use anyhow::{self as ah, format_err as err, Context as _};
use letmein_fwproto::{FirewallMessage, FirewallOperation, SOCK_FILE};
use std::{net::IpAddr, path::Path};
use tokio::net::UnixStream;
pub struct FirewallClient {
stream: UnixStream,
}
impl FirewallClient {
/// Connect to the firewall daemon via Unix socket.
pub async fn new(rundir: &Path) -> ah::Result<Self> {
let sock_path = rundir.join("letmeinfwd").join(SOCK_FILE);
let stream = UnixStream::connect(sock_path)
.await
.context("Connect to Unix socket")?;
Ok(Self { stream })
}
/// Send a request to open a firewall `port` for the specified `addr`.
pub async fn open_port(&mut self, addr: IpAddr, port: u16) -> ah::Result<()> {
// Send an open-port request to the firewall daemon.
FirewallMessage::new_open(addr, port)
.send(&mut self.stream)
.await
.context("Send port-open message")?;
// Receive the open-port reply.
let Some(msg_reply) = FirewallMessage::recv(&mut self.stream)
.await
.context("Receive port-open reply")?
else {
return Err(err!("Connection terminated"));
};
match msg_reply.operation() {
FirewallOperation::Ack => Ok(()),
FirewallOperation::Nack => Err(err!("The firewall rejected the port-open request")),
FirewallOperation::OpenV4 | FirewallOperation::OpenV6 => {
Err(err!("Received invalid reply"))
}
}
}
}
// vim: ts=4 sw=4 expandtab
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