diff options
| -rw-r--r-- | Cargo.lock | 764 | ||||
| -rw-r--r-- | Cargo.toml | 3 | ||||
| -rw-r--r-- | src/main.rs | 137 |
3 files changed, 902 insertions, 2 deletions
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"registry+https://github.com/rust-lang/crates.io-index" +checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde" @@ -4,3 +4,6 @@ version = "0.1.0" edition = "2021" [dependencies] +rsdsl_netlinklib = { git = "https://github.com/rsdsl/netlinklib.git", default-features = false, features = ["addr", "blocking", "link"] } +thiserror = "1.0" +wireguard-control = "1.5.0" diff --git a/src/main.rs b/src/main.rs index e7a11a9..ab1a77a 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,3 +1,136 @@ -fn main() { - println!("Hello, world!"); +use std::fs::{self, File}; +use std::io::{self, BufRead, BufReader}; +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 PORT: u16 = 51820; +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); + } + + let keypair = read_or_generate_keypair()?; + println!("[info] pubkey {}", keypair.public.to_base64()); + + configure_link(&connection, keypair)?; + println!("[info] config {}", IFNAME); + + loop { + thread::park(); + } +} + +fn configure_link(connection: &Connection, keypair: KeyPair) -> Result<()> { + unconfigure_link(connection)?; + 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)?; + + todo!("config link addr") +} + +fn unconfigure_link(connection: &Connection) -> 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> { + Ok(match read_keypair() { + Ok(keypair) => keypair, + Err(e) => { + println!("[warn] unable to read keypair: {}", e); + KeyPair::generate() + } + }) +} + +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 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(); + + // Discard human-readable peer 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); + + 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); + } + + peers.push(builder); + } + + Ok(peers) } |