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|
use hex::FromHex;
use subtle::ConstantTimeEq;
use x25519_dalek::{PublicKey, StaticSecret};
use super::{ConfigError, Configuration};
#[derive(Copy, Clone)]
enum ParserState {
Peer {
public_key: PublicKey,
update_only: bool,
},
Interface,
}
pub struct LineParser<'a, C: Configuration> {
config: &'a C,
state: ParserState,
}
impl<'a, C: Configuration> LineParser<'a, C> {
pub fn new(config: &'a C) -> LineParser<'a, C> {
LineParser {
config,
state: ParserState::Interface,
}
}
fn new_peer(value: &str) -> Result<ParserState, ConfigError> {
match <[u8; 32]>::from_hex(value) {
Ok(pk) => Ok(ParserState::Peer {
public_key: PublicKey::from(pk),
update_only: false,
}),
Err(_) => Err(ConfigError::InvalidHexValue),
}
}
pub fn parse_line(&mut self, key: &str, value: &str) -> Result<(), ConfigError> {
// add the peer if not update_only
let flush_peer = |st: ParserState| -> ParserState {
match st {
ParserState::Peer {
public_key,
update_only: false,
} => {
self.config.add_peer(&public_key);
ParserState::Peer {
public_key,
update_only: true,
}
}
_ => st,
}
};
// parse line and update parser state
self.state = match self.state {
// configure the interface
ParserState::Interface => match key {
// opt: set private key
"private_key" => match <[u8; 32]>::from_hex(value) {
Ok(sk) => {
self.config.set_private_key(if sk == [0u8; 32] {
None
} else {
Some(StaticSecret::from(sk))
});
Ok(self.state)
}
Err(_) => Err(ConfigError::InvalidHexValue),
},
// opt: set listen port
"listen_port" => match value.parse() {
Ok(port) => {
self.config.set_listen_port(Some(port));
Ok(self.state)
}
Err(_) => Err(ConfigError::InvalidPortNumber),
},
// opt: set fwmark
"fwmark" => match value.parse() {
Ok(fwmark) => {
self.config
.set_fwmark(if fwmark == 0 { None } else { Some(fwmark) });
Ok(self.state)
}
Err(_) => Err(ConfigError::InvalidFwmark),
},
// opt: remove all peers
"replace_peers" => match value {
"true" => {
for p in self.config.get_peers() {
self.config.remove_peer(&p.public_key)
}
Ok(self.state)
}
_ => Err(ConfigError::UnsupportedValue),
},
// opt: transition to peer configuration
"public_key" => Self::new_peer(value),
// unknown key
_ => Err(ConfigError::InvalidKey),
},
// configure peers
ParserState::Peer { public_key, .. } => match key {
// opt: new peer
"public_key" => {
flush_peer(self.state);
Self::new_peer(value)
}
// opt: remove peer
"remove" => {
self.config.remove_peer(&public_key);
Ok(self.state)
}
// opt: update only
"update_only" => Ok(ParserState::Peer {
public_key,
update_only: true,
}),
// opt: set preshared key
"preshared_key" => match <[u8; 32]>::from_hex(value) {
Ok(psk) => {
let st = flush_peer(self.state);
self.config.set_preshared_key(
&public_key,
if psk.ct_eq(&[0u8; 32]).into() {
None
} else {
Some(psk)
},
);
Ok(st)
}
Err(_) => Err(ConfigError::InvalidHexValue),
},
// opt: set endpoint
"endpoint" => match value.parse() {
Ok(endpoint) => {
let st = flush_peer(self.state);
self.config.set_endpoint(&public_key, endpoint);
Ok(st)
}
Err(_) => Err(ConfigError::InvalidSocketAddr),
},
// opt: set persistent keepalive interval
"persistent_keepalive_interval" => match value.parse() {
Ok(secs) => {
let st = flush_peer(self.state);
self.config
.set_persistent_keepalive_interval(&public_key, secs);
Ok(st)
}
Err(_) => Err(ConfigError::InvalidKeepaliveInterval),
},
// opt replace allowed ips
"replace_allowed_ips" => {
let st = flush_peer(self.state);
self.config.replace_allowed_ips(&public_key);
Ok(st)
}
// opt add allowed ips
"allowed_ip" => {
let mut split = value.splitn(2, "/");
let addr = split.next().and_then(|x| x.parse().ok());
let cidr = split.next().and_then(|x| x.parse().ok());
match (addr, cidr) {
(Some(addr), Some(cidr)) => {
let st = flush_peer(self.state);
self.config.add_allowed_ip(&public_key, addr, cidr);
Ok(st)
}
_ => Err(ConfigError::InvalidAllowedIp),
}
}
// set protocol version of peer
"protocol_version" => {
let parse_res: Result<usize, _> = value.parse();
match parse_res {
Ok(version) => {
if version == 0 || version > self.config.get_protocol_version() {
Err(ConfigError::UnsupportedProtocolVersion)
} else {
Ok(self.state)
}
}
Err(_) => Err(ConfigError::UnsupportedProtocolVersion),
}
}
// unknown key
_ => Err(ConfigError::InvalidKey),
},
}?;
Ok(())
}
}
|
