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use std::collections::HashSet;
use anyhow::Result;
use iptables;
use log::*;
use tokio::{
select,
sync::watch,
time::{self, Duration},
};
use crate::{fw, messages};
pub struct FirewallActor {
pub ipt_v4: iptables::IPTables,
pub ipt_v6: iptables::IPTables,
rx_ports: watch::Receiver<messages::PublicExposedPorts>,
last_ports: messages::PublicExposedPorts,
refresh: Duration,
}
impl FirewallActor {
pub async fn new(
refresh: Duration,
rxp: &watch::Receiver<messages::PublicExposedPorts>,
) -> Result<Self> {
let ctx = Self {
ipt_v4: iptables::new(false)?,
ipt_v6: iptables::new(true)?,
rx_ports: rxp.clone(),
last_ports: messages::PublicExposedPorts::new(),
refresh,
};
fw::setup(&ctx.ipt_v4)?;
fw::setup(&ctx.ipt_v6)?;
return Ok(ctx);
}
pub async fn listen(&mut self) -> Result<()> {
let mut interval = time::interval(self.refresh);
loop {
// 1. Wait for an event
let new_ports = select! {
_ = self.rx_ports.changed() => Some(self.rx_ports.borrow().clone()),
_ = interval.tick() => None,
else => return Ok(()) // Sender dropped, terminate loop.
};
// 2. Update last ports if needed
if let Some(p) = new_ports {
self.last_ports = p;
}
// 3. Update firewall rules
match self.do_fw_update().await {
Ok(()) => debug!("Successfully updated firewall rules"),
Err(e) => error!("An error occured while updating firewall rules. {}", e),
}
}
}
pub async fn do_fw_update(&self) -> Result<()> {
for ipt in [&self.ipt_v4, &self.ipt_v6] {
let curr_opened_ports = fw::get_opened_ports(ipt)?;
let diff_tcp = self
.last_ports
.tcp_ports
.difference(&curr_opened_ports.tcp_ports)
.copied()
.collect::<HashSet<u16>>();
let diff_udp = self
.last_ports
.udp_ports
.difference(&curr_opened_ports.udp_ports)
.copied()
.collect::<HashSet<u16>>();
let ports_to_open = messages::PublicExposedPorts {
tcp_ports: diff_tcp,
udp_ports: diff_udp,
};
fw::open_ports(ipt, ports_to_open)?;
}
return Ok(());
}
}
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