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use std::fs::{self, File};
use std::io;
use std::net::{Ipv4Addr, Ipv6Addr, SocketAddrV4};
use std::path::Path;
use std::thread;
use std::time::Duration;
use byteorder::{ByteOrder, NetworkEndian as NE};
use notify::event::{CreateKind, ModifyKind};
use notify::{Event, EventKind, RecursiveMode, Watcher};
use rsdsl_he_config::{Config, UsableConfig};
use rsdsl_ip_config::DsConfig;
use rsdsl_netlinkd::{addr, link, route};
use rsdsl_netlinkd_sys::Sit;
use thiserror::Error;
#[derive(Debug, Error)]
enum Error {
#[error("io: {0}")]
Io(#[from] io::Error),
#[error("notify: {0}")]
Notify(#[from] notify::Error),
#[error("reqwest: {0}")]
Reqwest(#[from] reqwest::Error),
#[error("rsdsl_netlinkd: {0}")]
RsdslNetlinkd(#[from] rsdsl_netlinkd::error::Error),
#[error("rsdsl_netlinkd_sys: {0}")]
RsdslNetlinkdSys(#[from] rsdsl_netlinkd_sys::Error),
#[error("serde_json: {0}")]
SerdeJson(#[from] serde_json::Error),
}
type Result<T> = std::result::Result<T, Error>;
fn main() -> Result<()> {
let mut file = File::open("/data/he6in4.conf")?;
let config: Config = serde_json::from_reader(&mut file)?;
let config: UsableConfig = config.into();
let ds_config = Path::new(rsdsl_ip_config::LOCATION);
while !ds_config.exists() {
println!("wait for pppoe");
thread::sleep(Duration::from_secs(8));
}
let mut tnl = None;
configure_lan(&config);
configure_vlans(&config);
let do_setup = |tnl: &mut Option<Sit>, config: &UsableConfig| -> Result<()> {
*tnl = None;
let mut file = File::open(rsdsl_ip_config::LOCATION)?;
let dsconfig: DsConfig = serde_json::from_reader(&mut file)?;
if let Some(ref v4) = dsconfig.v4 {
let local = v4.addr;
let remote = config.serv;
*tnl = Some(Sit::new("he6in4", "ppp0", local, remote)?);
configure_endpoint(config);
configure_tunnel(config, &dsconfig);
} else {
println!("no native ipv4");
}
Ok(())
};
let setup = move |tnl: &mut Option<Sit>, config: &UsableConfig| match do_setup(tnl, config) {
Ok(_) => {}
Err(e) => println!("can't create he6in4: {}", e),
};
setup(&mut tnl, &config);
let mut watcher = notify::recommended_watcher(move |res: notify::Result<Event>| match res {
Ok(event) => match event.kind {
EventKind::Create(kind) if kind == CreateKind::File => setup(&mut tnl, &config),
EventKind::Modify(kind) if matches!(kind, ModifyKind::Data(_)) => {
setup(&mut tnl, &config)
}
_ => {}
},
Err(e) => println!("watch error: {:?}", e),
})?;
watcher.watch(ds_config, RecursiveMode::NonRecursive)?;
loop {
thread::sleep(Duration::MAX)
}
}
fn configure_endpoint(config: &UsableConfig) {
match configure_local(config) {
Ok(_) => println!("update local endpoint"),
Err(e) => println!("can't update local endpoint: {:?}", e),
}
}
fn configure_local(config: &UsableConfig) -> Result<()> {
for i in 0..3 {
match reqwest::blocking::Client::builder()
.resolve(
"ipv4.tunnelbroker.net",
SocketAddrV4::new(Ipv4Addr::new(64, 62, 200, 2), 443).into(),
)
.build()?
.get(&config.updt)
.send()
{
Ok(v) => {
v.error_for_status()?;
break;
}
Err(e) => {
if i == 2 {
return Err(e.into());
}
thread::sleep(Duration::from_secs(8));
}
}
}
Ok(())
}
fn configure_tunnel(config: &UsableConfig, dsconfig: &DsConfig) {
match configure_he6in4(config, dsconfig) {
Ok(_) => {
println!("configure he6in4 ({})", config.serv);
println!("tunnel /64: {}", config.tn64);
println!("routed /64: {}", config.rt64);
println!("routed /48: {}", config.rt48);
}
Err(e) => println!("can't configure he6in4: {:?}", e),
}
}
fn configure_he6in4(config: &UsableConfig, dsconfig: &DsConfig) -> Result<()> {
let local_v6: Ipv6Addr = (u128::from_be_bytes(config.tn64.trunc().addr().octets()) | 2).into();
let remote_v6: Ipv6Addr = (u128::from_be_bytes(config.tn64.trunc().addr().octets()) | 1).into();
link::up("he6in4".into())?;
addr::flush("he6in4".into())?;
addr::add("he6in4".into(), local_v6.into(), 64)?;
// Check for native connectivity to avoid breaking netlinkd.
if dsconfig.v6.is_none() {
route::add6(Ipv6Addr::UNSPECIFIED, 0, Some(remote_v6), "he6in4".into())?;
}
Ok(())
}
fn configure_lan(config: &UsableConfig) {
match configure_eth0(config) {
Ok(_) => {}
Err(e) => println!("can't configure eth0: {:?}", e),
}
}
fn configure_eth0(config: &UsableConfig) -> Result<()> {
let addr_dbg: Ipv6Addr = (u128::from_be_bytes(config.rt64.trunc().addr().octets()) | 1).into();
let addr: Ipv6Addr = (u128::from_be_bytes(config.rt48.trunc().addr().octets()) | 1).into();
println!("wait for eth0");
link::wait_exists("eth0".into())?;
fs::write("/proc/sys/net/ipv6/conf/eth0/accept_ra", "0")?;
addr::add("eth0".into(), addr_dbg.into(), 64)?;
addr::add("eth0".into(), addr.into(), 64)?;
println!("configure eth0 ({}/64, dbg {}/64)", addr, addr_dbg);
Ok(())
}
fn configure_vlans(config: &UsableConfig) {
match configure_eth0_vlans(config) {
Ok(_) => {}
Err(e) => println!("can't configure vlans: {:?}", e),
}
}
fn configure_eth0_vlans(config: &UsableConfig) -> Result<()> {
let zones = ["trusted", "untrusted", "isolated", "exposed"];
for (i, zone) in zones.iter().enumerate() {
let vlan_id = 10 * (i + 1);
let vlan_name = format!("eth0.{}", vlan_id);
let mut octets = config.rt48.trunc().addr().octets();
NE::write_u16(&mut octets[6..8], vlan_id as u16);
let vlan_addr = Ipv6Addr::from(u128::from_be_bytes(octets) | 1);
println!("wait for {}", vlan_name);
link::wait_exists(vlan_name.clone())?;
fs::write(
format!("/proc/sys/net/ipv6/conf/{}/accept_ra", vlan_name),
"0",
)?;
addr::add(vlan_name.clone(), vlan_addr.into(), 64)?;
println!("configure {} ({}/64) zone {}", vlan_name, vlan_addr, zone);
}
Ok(())
}
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