innernet/wgctrl-rs/src/device.rs

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use libc::c_char;
use crate::{backends, key::Key, Backend, KeyPair, PeerConfigBuilder};
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use std::{
borrow::Cow,
ffi::CStr,
fmt, io,
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net::{IpAddr, SocketAddr},
str::FromStr,
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time::SystemTime,
};
/// Represents an IP address a peer is allowed to have, in CIDR notation.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct AllowedIp {
/// The IP address.
pub address: IpAddr,
/// The CIDR subnet mask.
pub cidr: u8,
}
impl std::str::FromStr for AllowedIp {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let parts: Vec<_> = s.split('/').collect();
if parts.len() != 2 {
return Err(());
}
Ok(AllowedIp {
address: parts[0].parse().map_err(|_| ())?,
cidr: parts[1].parse().map_err(|_| ())?,
})
}
}
/// Represents a single peer's configuration (i.e. persistent attributes).
///
/// These are the attributes that don't change over time and are part of the configuration.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct PeerConfig {
/// The public key of the peer.
pub public_key: Key,
/// The preshared key available to both peers (`None` means no PSK is used).
pub preshared_key: Option<Key>,
/// The endpoint this peer listens for connections on (`None` means any).
pub endpoint: Option<SocketAddr>,
/// The interval for sending keepalive packets (`None` means disabled).
pub persistent_keepalive_interval: Option<u16>,
/// The IP addresses this peer is allowed to have.
pub allowed_ips: Vec<AllowedIp>,
pub(crate) __cant_construct_me: (),
}
/// Represents a single peer's current statistics (i.e. the data from the current session).
///
/// These are the attributes that will change over time; to update them,
/// re-read the information from the interface.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct PeerStats {
/// Time of the last handshake/rekey with this peer.
pub last_handshake_time: Option<SystemTime>,
/// Number of bytes received from this peer.
pub rx_bytes: u64,
/// Number of bytes transmitted to this peer.
pub tx_bytes: u64,
pub(crate) __cant_construct_me: (),
}
/// Represents the complete status of a peer.
///
/// This struct simply combines [`PeerInfo`](PeerInfo) and [`PeerStats`](PeerStats)
/// to represent all available information about a peer.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct PeerInfo {
pub config: PeerConfig,
pub stats: PeerStats,
}
/// Represents all available information about a WireGuard device (interface).
///
/// This struct contains the current configuration of the device
/// and the current configuration _and_ state of all of its peers.
/// The peer statistics are retrieved once at construction time,
/// and need to be updated manually by calling [`get_by_name`](DeviceInfo::get_by_name).
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct Device {
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/// The interface name of this device
pub name: InterfaceName,
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/// The public encryption key of this interface (if present)
pub public_key: Option<Key>,
/// The private encryption key of this interface (if present)
pub private_key: Option<Key>,
/// The [fwmark](https://www.linux.org/docs/man8/tc-fw.html) of this interface
pub fwmark: Option<u32>,
/// The port to listen for incoming connections on
pub listen_port: Option<u16>,
/// The list of all registered peers and their information
pub peers: Vec<PeerInfo>,
/// The associated "real name" of the interface (ex. "utun8" on macOS).
pub linked_name: Option<String>,
/// The backend the device exists on (userspace or kernel).
pub backend: Backend,
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pub(crate) __cant_construct_me: (),
}
type RawInterfaceName = [c_char; libc::IFNAMSIZ];
/// The name of a Wireguard interface device.
#[derive(PartialEq, Eq, Clone, Copy)]
pub struct InterfaceName(RawInterfaceName);
impl FromStr for InterfaceName {
type Err = InvalidInterfaceName;
/// Attempts to parse a Rust string as a valid Linux interface name.
///
/// Extra validation logic ported from [iproute2](https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/lib/utils.c#n827)
fn from_str(name: &str) -> Result<Self, InvalidInterfaceName> {
let len = name.len();
if len == 0 {
return Err(InvalidInterfaceName::Empty);
}
// Ensure its short enough to include a trailing NUL
if len > (libc::IFNAMSIZ - 1) {
return Err(InvalidInterfaceName::TooLong);
}
let mut buf = [c_char::default(); libc::IFNAMSIZ];
// Check for interior NULs and other invalid characters.
for (out, b) in buf.iter_mut().zip(name.as_bytes().iter()) {
if *b == 0 || *b == b'/' || b.is_ascii_whitespace() {
return Err(InvalidInterfaceName::InvalidChars);
}
*out = *b as c_char;
}
Ok(Self(buf))
}
}
impl InterfaceName {
#[cfg(target_os = "linux")]
/// Creates a new [InterfaceName](Self).
///
/// ## Safety
///
/// The caller must ensure that `name` is a valid C string terminated by a NUL.
pub(crate) unsafe fn from_wg(name: RawInterfaceName) -> Self {
Self(name)
}
/// Returns a human-readable form of the device name.
///
/// Only use this when the interface name was constructed from a Rust string.
pub fn as_str_lossy(&self) -> Cow<'_, str> {
// SAFETY: These are C strings coming from wgctrl, so they are correctly NUL terminated.
unsafe { CStr::from_ptr(self.0.as_ptr()) }.to_string_lossy()
}
#[cfg(target_os = "linux")]
/// Returns a pointer to the inner byte buffer for FFI calls.
pub(crate) fn as_ptr(&self) -> *const c_char {
self.0.as_ptr()
}
#[cfg(target_os = "linux")]
/// Consumes this interface name, returning its raw byte buffer.
pub(crate) fn into_inner(self) -> RawInterfaceName {
self.0
}
}
impl fmt::Debug for InterfaceName {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(&self.as_str_lossy())
}
}
impl fmt::Display for InterfaceName {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(&self.as_str_lossy())
}
}
/// An interface name was bad.
#[derive(Debug, PartialEq)]
pub enum InvalidInterfaceName {
/// Provided name was longer then the interface name length limit
/// of the system.
TooLong,
// These checks are done in the kernel as well, but no reason to let bad names
// get that far: https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/lib/utils.c?id=1f420318bda3cc62156e89e1b56d60cc744b48ad#n827.
/// Interface name was an empty string.
Empty,
/// Interface name contained a nul, `/` or whitespace character.
InvalidChars,
}
impl fmt::Display for InvalidInterfaceName {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::TooLong => write!(
f,
"interface name longer than system max of {} chars",
libc::IFNAMSIZ
),
Self::Empty => f.write_str("an empty interface name was provided"),
Self::InvalidChars => f.write_str("interface name contained slash or space characters"),
}
}
}
impl From<InvalidInterfaceName> for std::io::Error {
fn from(e: InvalidInterfaceName) -> Self {
std::io::Error::new(std::io::ErrorKind::InvalidData, e.to_string())
}
}
impl std::error::Error for InvalidInterfaceName {}
impl Device {
/// Enumerates all WireGuard interfaces currently present in the system,
/// both with kernel and userspace backends.
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///
/// You can use [`get_by_name`](DeviceInfo::get_by_name) to retrieve more
/// detailed information on each interface.
pub fn list(backend: Backend) -> Result<Vec<InterfaceName>, std::io::Error> {
match backend {
#[cfg(target_os = "linux")]
Backend::Kernel => backends::kernel::enumerate(),
Backend::Userspace => backends::userspace::enumerate(),
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}
}
pub fn get(name: &InterfaceName, backend: Backend) -> Result<Self, std::io::Error> {
match backend {
#[cfg(target_os = "linux")]
Backend::Kernel => backends::kernel::get_by_name(name),
Backend::Userspace => backends::userspace::get_by_name(name),
}
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}
pub fn delete(self) -> Result<(), std::io::Error> {
match self.backend {
#[cfg(target_os = "linux")]
Backend::Kernel => backends::kernel::delete_interface(&self.name),
Backend::Userspace => backends::userspace::delete_interface(&self.name),
}
}
}
/// Builds and represents a configuration that can be applied to a WireGuard interface.
///
/// This is the primary way of changing the settings of an interface.
///
/// Note that if an interface exists, the configuration is applied _on top_ of the existing
/// settings, and missing parts are not overwritten or set to defaults.
///
/// If this is not what you want, use [`delete_interface`](delete_interface)
/// to remove the interface entirely before applying the new configuration.
///
/// # Example
/// ```rust
/// # use wgctrl::*;
/// # use std::net::AddrParseError;
/// # fn try_main() -> Result<(), AddrParseError> {
/// let our_keypair = KeyPair::generate();
/// let peer_keypair = KeyPair::generate();
/// let server_addr = "192.168.1.1:51820".parse()?;
///
/// DeviceUpdate::new()
/// .set_keypair(our_keypair)
/// .replace_peers()
/// .add_peer_with(&peer_keypair.public, |peer| {
/// peer.set_endpoint(server_addr)
/// .replace_allowed_ips()
/// .allow_all_ips()
/// }).apply(&"wg-example".parse().unwrap(), Backend::Userspace);
///
/// println!("Send these keys to your peer: {:#?}", peer_keypair);
///
/// # Ok(())
/// # }
/// # fn main() { try_main(); }
/// ```
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct DeviceUpdate {
pub(crate) public_key: Option<Key>,
pub(crate) private_key: Option<Key>,
pub(crate) fwmark: Option<u32>,
pub(crate) listen_port: Option<u16>,
pub(crate) peers: Vec<PeerConfigBuilder>,
pub(crate) replace_peers: bool,
}
impl DeviceUpdate {
/// Creates a new `DeviceConfigBuilder` that does nothing when applied.
pub fn new() -> Self {
DeviceUpdate {
public_key: None,
private_key: None,
fwmark: None,
listen_port: None,
peers: vec![],
replace_peers: false,
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}
}
/// Sets a new keypair to be applied to the interface.
///
/// This is a convenience method that simply wraps
/// [`set_public_key`](DeviceConfigBuilder::set_public_key)
/// and [`set_private_key`](DeviceConfigBuilder::set_private_key).
pub fn set_keypair(self, keypair: KeyPair) -> Self {
self.set_public_key(keypair.public)
.set_private_key(keypair.private)
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}
/// Specifies a new public key to be applied to the interface.
pub fn set_public_key(mut self, key: Key) -> Self {
self.public_key = Some(key);
self
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}
/// Specifies that the public key for this interface should be unset.
pub fn unset_public_key(self) -> Self {
self.set_public_key(Key::zero())
}
/// Sets a new private key to be applied to the interface.
pub fn set_private_key(mut self, key: Key) -> Self {
self.private_key = Some(key);
self
}
/// Specifies that the private key for this interface should be unset.
pub fn unset_private_key(self) -> Self {
self.set_private_key(Key::zero())
}
/// Specifies the fwmark value that should be applied to packets coming from the interface.
pub fn set_fwmark(mut self, fwmark: u32) -> Self {
self.fwmark = Some(fwmark);
self
}
/// Specifies that fwmark should not be set on packets from the interface.
pub fn unset_fwmark(self) -> Self {
self.set_fwmark(0)
}
/// Specifies the port to listen for incoming packets on.
///
/// This is useful for a server configuration that listens on a fixed endpoint.
pub fn set_listen_port(mut self, port: u16) -> Self {
self.listen_port = Some(port);
self
}
/// Specifies that a random port should be used for incoming packets.
///
/// This is probably what you want in client configurations.
pub fn randomize_listen_port(self) -> Self {
self.set_listen_port(0)
}
/// Specifies a new peer configuration to be added to the interface.
///
/// See [`PeerConfigBuilder`](PeerConfigBuilder) for details on building
/// peer configurations. This method can be called more than once, and all
/// peers will be added to the configuration.
pub fn add_peer(mut self, peer: PeerConfigBuilder) -> Self {
self.peers.push(peer);
self
}
/// Specifies a new peer configuration using a builder function.
///
/// This is simply a convenience method to make adding peers more fluent.
/// This method can be called more than once, and all peers will be added
/// to the configuration.
pub fn add_peer_with(
self,
pubkey: &Key,
builder: impl Fn(PeerConfigBuilder) -> PeerConfigBuilder,
) -> Self {
self.add_peer(builder(PeerConfigBuilder::new(pubkey)))
}
/// Specifies multiple peer configurations to be added to the interface.
pub fn add_peers(mut self, peers: &[PeerConfigBuilder]) -> Self {
self.peers.extend_from_slice(peers);
self
}
/// Specifies that the peer configurations in this `DeviceConfigBuilder` should
/// replace the existing configurations on the interface, not modify or append to them.
pub fn replace_peers(mut self) -> Self {
self.replace_peers = true;
self
}
/// Specifies that the peer with this public key should be removed from the interface.
pub fn remove_peer_by_key(self, public_key: &Key) -> Self {
let mut peer = PeerConfigBuilder::new(public_key);
peer.remove_me = true;
self.add_peer(peer)
}
/// Build and apply the configuration to a WireGuard interface by name.
///
/// An interface with the provided name will be created if one does not exist already.
pub fn apply(self, iface: &InterfaceName, backend: Backend) -> io::Result<()> {
match backend {
#[cfg(target_os = "linux")]
Backend::Kernel => backends::kernel::apply(&self, &iface),
Backend::Userspace => backends::userspace::apply(&self, &iface),
}
}
}
impl Default for DeviceUpdate {
fn default() -> Self {
Self::new()
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}
}
#[cfg(test)]
mod tests {
use crate::{DeviceUpdate, InterfaceName, InvalidInterfaceName, KeyPair, PeerConfigBuilder};
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const TEST_INTERFACE: &str = "wgctrl-test";
use super::*;
#[test]
fn test_add_peers() {
if unsafe { libc::getuid() } != 0 {
return;
}
let keypairs: Vec<_> = (0..10).map(|_| KeyPair::generate()).collect();
let mut builder = DeviceUpdate::new();
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for keypair in &keypairs {
builder = builder.add_peer(PeerConfigBuilder::new(&keypair.public))
}
let interface = TEST_INTERFACE.parse().unwrap();
builder.apply(&interface, Backend::Userspace).unwrap();
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let device = Device::get(&interface, Backend::Userspace).unwrap();
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for keypair in &keypairs {
assert!(device
.peers
.iter()
.any(|p| p.config.public_key == keypair.public));
}
device.delete().unwrap();
}
#[test]
fn test_interface_names() {
assert_eq!(
"wg-01".parse::<InterfaceName>().unwrap().as_str_lossy(),
"wg-01"
);
assert!("longer-nul\0".parse::<InterfaceName>().is_err());
let invalid_names = &[
("", InvalidInterfaceName::Empty), // Empty Rust string
("\0", InvalidInterfaceName::InvalidChars), // Empty C string
("ifname\0nul", InvalidInterfaceName::InvalidChars), // Contains interior NUL
("if name", InvalidInterfaceName::InvalidChars), // Contains a space
("ifna/me", InvalidInterfaceName::InvalidChars), // Contains a slash
("if na/me", InvalidInterfaceName::InvalidChars), // Contains a space and slash
("interfacelongname", InvalidInterfaceName::TooLong), // Too long
];
for (name, expected) in invalid_names {
assert!(name.parse::<InterfaceName>().as_ref() == Err(expected))
}
}
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}