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use std::net::{IpAddr, SocketAddr};
use std::time::{Duration, SystemTime};
use anyhow::{anyhow, bail, Result};
use log::*;
use serde::{Deserialize, Serialize};
use crate::config::{RuntimeConfigConsul, RuntimeConfigStun};
use crate::consul;
pub struct StunActor {
node: String,
consul: consul::Consul,
stun_server_v4: Option<SocketAddr>,
stun_server_v6: SocketAddr,
refresh_time: Duration,
}
#[derive(Serialize, Deserialize, Debug)]
pub struct AutodiscoverResult {
pub timestamp: u64,
pub address: Option<IpAddr>,
}
impl StunActor {
pub fn new(
consul_config: &RuntimeConfigConsul,
stun_config: &RuntimeConfigStun,
node: &str,
) -> Self {
assert!(stun_config
.stun_server_v4
.map(|x| x.is_ipv4())
.unwrap_or(true));
assert!(stun_config.stun_server_v6.is_ipv6());
Self {
consul: consul::Consul::new(consul_config),
node: node.to_string(),
stun_server_v4: stun_config.stun_server_v4,
stun_server_v6: stun_config.stun_server_v6,
refresh_time: stun_config.refresh_time,
}
}
pub async fn listen(&mut self) -> Result<()> {
loop {
let ipv4_result = match self.stun_server_v4 {
Some(stun_server_v4) => self.autodiscover_ip(stun_server_v4).await,
None => self.autodiscover_none_ipv4().await,
};
if let Err(e) = ipv4_result {
error!("Unable to autodiscover IPv4 address: {}", e);
}
if let Err(e) = self.autodiscover_ip(self.stun_server_v6).await {
error!("Unable to autodiscover IPv6 address: {}", e);
}
tokio::time::sleep(self.refresh_time).await;
}
}
async fn autodiscover_ip(&self, stun_server: SocketAddr) -> Result<()> {
let binding_addr = match stun_server.is_ipv4() {
true => "0.0.0.0:34791".parse().unwrap(),
false => "[::]:34792".parse().unwrap(),
};
let discovered_addr = get_mapped_addr(stun_server, binding_addr).await?.ip();
let consul_key = match stun_server.is_ipv4() {
true => {
debug!("Autodiscovered IPv4: {}", discovered_addr);
format!("diplonat/autodiscovery/ipv4/{}", self.node)
}
false => {
debug!("Autodiscovered IPv6: {}", discovered_addr);
format!("diplonat/autodiscovery/ipv6/{}", self.node)
}
};
self.consul
.kv_put(
&consul_key,
serde_json::to_vec(&AutodiscoverResult {
timestamp: timestamp(),
address: Some(discovered_addr),
})?,
)
.await?;
Ok(())
}
async fn autodiscover_none_ipv4(&self) -> Result<()> {
let consul_key = format!("diplonat/autodiscovery/ipv4/{}", self.node);
self.consul
.kv_put(
&consul_key,
serde_json::to_vec(&AutodiscoverResult {
timestamp: timestamp(),
address: None,
})?,
)
.await?;
Ok(())
}
}
async fn get_mapped_addr(stun_server: SocketAddr, binding_addr: SocketAddr) -> Result<SocketAddr> {
use stun_client::*;
let mut client = Client::new(binding_addr, None).await.unwrap();
let res = client.binding_request(stun_server, None).await.unwrap();
if res.get_class() != Class::SuccessResponse {
bail!("STUN server did not responde with a success response");
}
let xor_mapped_addr = Attribute::get_xor_mapped_address(&res)
.ok_or(anyhow!("no XorMappedAddress found in STUN response"))?;
Ok(xor_mapped_addr)
}
fn timestamp() -> u64 {
SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.expect("clock error")
.as_secs()
}
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