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use std::fs::{self, File};
use std::io::{self, BufRead, BufReader};
use std::net::{Ipv4Addr, Ipv6Addr};
use std::thread;
use rsdsl_netlinklib::blocking::Connection;
use thiserror::Error;
use wireguard_control::{AllowedIp, Backend, DeviceUpdate, Key, KeyPair, PeerConfigBuilder};
const IFNAME: &str = "wg0";
const IFNAME_EXPOSED: &str = "wg1";
const INNER_ADDR4: Ipv4Addr = Ipv4Addr::new(10, 128, 50, 254);
const INNER_ADDR4_EXPOSED: Ipv4Addr = Ipv4Addr::new(10, 128, 60, 254);
const INNER_ADDR6: Ipv6Addr = Ipv6Addr::new(0xfd0b, 0x9272, 0x534e, 6, 0, 0, 0, 1);
const INNER_ADDR6_EXPOSED: Ipv6Addr = Ipv6Addr::new(0xfd0b, 0x9272, 0x534e, 7, 0, 0, 0, 1);
const PORT: u16 = 51820;
const PORT_EXPOSED: u16 = 51821;
const CONFIGFILE_PRIVATEKEY: &str = "/data/wgd.key";
const CONFIGFILE_PEERS: &str = "/data/wgd.peers";
#[derive(Debug, Error)]
enum Error {
#[error(
"too few peer config columns (want <name> <pubkey> <psk> <allowed-ip> [allowed-ip...])"
)]
TooFewPeerColumns,
#[error("invalid allowed ip {0}")]
InvalidAllowedIp(String),
#[error("io: {0}")]
Io(#[from] io::Error),
#[error("invalid base64 key: {0}")]
InvalidKey(String),
#[error("rsdsl_netlinklib: {0}")]
RsdslNetlinklib(#[from] rsdsl_netlinklib::Error),
}
type Result<T> = std::result::Result<T, Error>;
fn main() -> Result<()> {
println!("[info] init");
let connection = Connection::new()?;
if !connection.link_exists(String::from(IFNAME))? {
connection.link_add_wireguard(String::from(IFNAME))?;
println!("[info] create link {}", IFNAME);
} else {
println!("[info] link {} exists", IFNAME);
}
if !connection.link_exists(String::from(IFNAME_EXPOSED))? {
connection.link_add_wireguard(String::from(IFNAME_EXPOSED))?;
println!("[info] create exposed link {}", IFNAME_EXPOSED);
} else {
println!("[info] exposed link {} exists", IFNAME_EXPOSED);
}
let keypair = read_or_generate_keypair()?;
println!("[info] pubkey {}", keypair.public.to_base64());
configure_link(
&connection,
keypair.clone(),
IFNAME,
PORT,
INNER_ADDR4,
INNER_ADDR6,
)?;
println!("[info] config {}", IFNAME);
configure_link(
&connection,
keypair,
IFNAME_EXPOSED,
PORT_EXPOSED,
INNER_ADDR4_EXPOSED,
INNER_ADDR6_EXPOSED,
)?;
println!("[info] config {}", IFNAME_EXPOSED);
loop {
thread::park();
}
}
fn configure_link(
connection: &Connection,
keypair: KeyPair,
ifname: &str,
port: u16,
addr4: Ipv4Addr,
addr6: Ipv6Addr,
) -> Result<()> {
unconfigure_link(connection, ifname, port)?;
println!("[info] unconfig {}", ifname);
DeviceUpdate::new()
.add_peers(&read_peers()?)
.set_listen_port(port)
.set_keypair(keypair)
.apply(&ifname.parse().expect("valid link name"), Backend::Kernel)?;
connection.address_add(String::from(ifname), addr4.into(), 24)?;
connection.address_add(String::from(ifname), addr6.into(), 64)?;
connection.link_set(String::from(ifname), true)?;
Ok(())
}
fn unconfigure_link(connection: &Connection, ifname: &str, port: u16) -> Result<()> {
connection.address_flush(String::from(ifname))?;
DeviceUpdate::new()
.replace_peers()
.set_listen_port(port)
.unset_fwmark()
.unset_private_key()
.unset_public_key()
.apply(&ifname.parse().expect("valid link name"), Backend::Kernel)?;
Ok(())
}
fn read_or_generate_keypair() -> Result<KeyPair> {
match read_keypair() {
Ok(keypair) => Ok(keypair),
Err(e) => {
println!("[warn] unable to read keypair: {}", e);
generate_and_save_keypair()
}
}
}
fn read_keypair() -> Result<KeyPair> {
let private_base64 = fs::read_to_string(CONFIGFILE_PRIVATEKEY)?;
let private_key =
Key::from_base64(&private_base64).map_err(|_| Error::InvalidKey(private_base64))?;
Ok(KeyPair::from_private(private_key))
}
fn generate_and_save_keypair() -> Result<KeyPair> {
let keypair = KeyPair::generate();
fs::write(CONFIGFILE_PRIVATEKEY, keypair.private.to_base64())?;
Ok(keypair)
}
fn read_peers() -> Result<Vec<PeerConfigBuilder>> {
let file = File::open(CONFIGFILE_PEERS)?;
let br = BufReader::new(file);
let mut peers = Vec::new();
for line in br.lines() {
let line = line?;
let mut columns = line.split_whitespace();
let name = columns.next().ok_or(Error::TooFewPeerColumns)?;
let public_key_base64 = columns.next().ok_or(Error::TooFewPeerColumns)?;
let preshared_key_base64 = columns.next().ok_or(Error::TooFewPeerColumns)?;
let public_key = Key::from_base64(public_key_base64)
.map_err(|_| Error::InvalidKey(public_key_base64.to_string()))?;
let preshared_key = Key::from_base64(preshared_key_base64)
.map_err(|_| Error::InvalidKey(preshared_key_base64.to_string()))?;
let mut builder = PeerConfigBuilder::new(&public_key)
.replace_allowed_ips()
.set_preshared_key(preshared_key);
println!(
"[info] peer {} pubkey {} psk (hidden)",
name, public_key_base64
);
for column in columns {
let allowed_ip: AllowedIp = column
.parse()
.map_err(|_| Error::InvalidAllowedIp(column.to_string()))?;
builder = builder.add_allowed_ip(allowed_ip.address, allowed_ip.cidr);
println!(
"[info] peer {} allowedip {}/{}",
name, allowed_ip.address, allowed_ip.cidr
);
}
peers.push(builder);
}
Ok(peers)
}
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