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|
use anyhow::{anyhow, Context};
use log::{debug, info, warn, error};
use std::sync::{Arc, Mutex};
use tokio::net::UdpSocket;
use tokio::sync::mpsc;
use radio::{RadioManager, MAX_PACKET_LEN};
mod db;
mod radio;
mod config;
mod ui;
struct AppState {
conf : config::Config,
db : db::Database,
transmit_queue : mpsc::Sender<Vec<u8>>,
start_time : chrono::DateTime<chrono::Utc>,
}
type SharedState = Arc<Mutex<AppState>>;
const TUN_MTU : usize = 255;
#[tokio::main]
async fn main() -> std::io::Result<()> {
simple_logger::SimpleLogger::new().env().init().unwrap();
let conf = config::Config::load().expect("Could not load config");
let (mut tun_sink, tun_source) = if conf.tunnel.enabled {
let tunnelconf = conf.tunnel.clone();
let mut tunconfig = tun::Configuration::default();
tunconfig
.address(tunnelconf.local_ip)
.netmask(tunnelconf.netmask)
// TODO MTU could be increased to something a bit smaller than MAX_PACKET_LEN, but Arbitrary only have 255 byte
// payloads. Maybe propose a Tunnel whisker if it makes sense.
.mtu(TUN_MTU.try_into().unwrap())
// TODO is .destination() needed?
.up();
#[cfg(target_os = "linux")]
tunconfig.platform(|tunconfig| {
tunconfig.packet_information(true);
});
let dev = tun::create_as_async(&tunconfig).unwrap();
use futures::stream::StreamExt;
let (tun_sink, tun_source) = dev.into_framed().split();
(Some(tun_sink), Some(tun_source))
}
else {
(None, None)
};
let (radio_rx_queue, mut packet_receive) = mpsc::channel(16);
let (packet_send, mut radio_tx_queue) = mpsc::channel::<Vec<u8>>(16);
let shared_state = Arc::new(Mutex::new(AppState {
conf : conf.clone(),
db : db::Database::new().await,
transmit_queue : packet_send.clone(),
start_time : chrono::Utc::now(),
}));
if conf.freq == 0 {
warn!("Frequency {0} is zero, disabling radio. Fake receiver udp 127.0.0.1:9073, sending to 9074", conf.freq);
let sock_r = Arc::new(UdpSocket::bind("127.0.0.1:9073").await?);
let sock_s = sock_r.clone();
// These two tasks behave like the radio, but use UDP instead of the RF channel.
tokio::spawn(async move {
let mut buf = [0; 1024];
while let Ok((len, addr)) = sock_r.recv_from(&mut buf).await {
println!("{:?} bytes received from {:?}", len, addr);
// Cut the length prefix, which isn't returned by the real radio
let packet = buf[2..len].to_vec();
let rssi = 0f64;
radio_rx_queue.send((packet, rssi)).await.expect("Inject frame");
}
});
tokio::spawn(async move {
while let Some(p) = radio_tx_queue.recv().await {
sock_s.send_to(&p, "127.0.0.1:9074").await.unwrap();
}
});
}
else if !(430000..=436380).contains(&conf.freq) {
error!("Frequency {} kHz out of range (430MHz - 436.375MHz), skipping radio setup", conf.freq);
}
else {
info!("Setting up radio");
let mut radio = RadioManager::new(radio_rx_queue, radio_tx_queue).expect("Could not initialize radio");
let channel = ((conf.freq - 430000) / 25) as u8;
radio.set_channel(channel);
let actual_freq = 430000 + 25 * channel as u32;
info!("Setting up radio on {actual_freq} kHz...");
tokio::task::spawn(async move {
loop {
if let Err(e) = radio.process_forever().await {
error!("Radio error: {e}")
}
}
});
}
let shared_state_receive = shared_state.clone();
tokio::task::spawn(async move {
while let Some((packet_data, rssi)) = packet_receive.recv().await {
debug!("RX RSSI {} len {}", rssi, packet_data.len());
let mut buf = [0; MAX_PACKET_LEN];
match ham_cats::packet::Packet::fully_decode(&packet_data, &mut buf) {
Ok(packet) => {
if let Some(ident) = packet.identification() {
debug!(" From {}-{}", ident.callsign, ident.ssid);
}
let mut db = shared_state_receive.lock().unwrap().db.clone();
if let Err(e) = db.store_packet(&packet_data).await {
warn!("Failed to write to sqlite: {}", e);
}
if let Some(sink) = &mut tun_sink {
for arb in packet.arbitrary_iter() {
use futures::SinkExt;
if let Err(e) = sink.send(tun::TunPacket::new(arb.0.to_vec())).await {
warn!("Failed to send to TUN: {}", e);
}
}
}
}
Err(e) => {
warn!("Failed to decode packet: {}", e);
eprintln!("{:02X?}", packet_data);
}
}
}
warn!("Packet receive task stopping");
});
let shared_state_tunnel = shared_state.clone();
if let Some(mut source) = tun_source {
tokio::task::spawn(async move {
use futures::stream::StreamExt;
while let Some(packet_from_tun) = source.next().await {
match packet_from_tun {
Ok(ip_packet) if ip_packet.get_bytes().len() <= TUN_MTU => {
println!("RX: {} bytes", ip_packet.get_bytes().len());
let config = shared_state_tunnel.lock().unwrap().conf.clone();
fn build_tun_packet(config: config::Config, ip_packet: &[u8]) -> anyhow::Result<Vec<u8>> {
let mut buf = [0; MAX_PACKET_LEN];
let mut pkt = ham_cats::packet::Packet::new(&mut buf);
pkt.add_identification(
ham_cats::whisker::Identification::new(&config.callsign, config.ssid, config.icon)
.context("Invalid identification")?
).map_err(|e| anyhow!("Could not add identification to packet: {e}"))?;
pkt.add_arbitrary(ham_cats::whisker::Arbitrary::new(ip_packet).unwrap())
.map_err(|e| anyhow!("Could not add data to packet: {e}"))?;
let mut buf2 = [0; MAX_PACKET_LEN];
let mut data = ham_cats::buffer::Buffer::new_empty(&mut buf2);
pkt.fully_encode(&mut data)
.map_err(|e| anyhow!("Could not encode packet: {e}"))?;
Ok(data.to_vec())
}
match build_tun_packet(config, ip_packet.get_bytes()) {
Ok(data) => if let Err(e) = packet_send.send(data).await {
warn!("Failed to send TUN packet: {e}");
},
Err(e) => warn!("Failed to prepare TUN packet: {e}"),
}
},
Ok(ip_packet) => {
println!("RX: too large packet: {} bytes", ip_packet.get_bytes().len());
},
Err(err) => panic!("Error: {:?}", err),
}
}
});
}
let port = 3000;
info!("Setting up listener on port {port}");
ui::serve(port, shared_state).await;
Ok(())
}
|
