use std::str;
use super::{
addr::Addr,
parser::{HostExprLanguage, Pairs, Parser, Rule},
port_set::PortSet,
};
#[derive(Clone, Debug, PartialEq)]
pub enum ConnectionExpr {
RouteExpr(RouteExpr),
HostKey(String),
}
impl ConnectionExpr {
pub fn try_as_route_expr(&self) -> Option<&RouteExpr> {
if let ConnectionExpr::RouteExpr(ref e) = *self {
Some(e)
} else {
None
}
}
}
impl From<RouteExpr> for ConnectionExpr {
fn from(route_expr: RouteExpr) -> Self {
ConnectionExpr::RouteExpr(route_expr)
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct RouteExpr {
pub ports: PortSet,
pub addr: Option<Addr>,
pub tunnel: Option<TunnelExpr>,
}
#[derive(Clone, Debug, PartialEq)]
pub struct TunnelExpr {
pub user: Option<String>,
pub addr: Addr,
pub ports: Option<PortSet>,
}
impl str::FromStr for ConnectionExpr {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let top_pair = HostExprLanguage::parse(Rule::connection_expr, s)
.map_err(|_| ParseError)?
.next()
.expect("grammar guarantees host expression")
.into_inner()
.next()
.expect("grammar guarantees inner specific host expression");
match top_pair.as_rule() {
Rule::local_connection_expr => {
connection_expr_from_local_connection_expr_pair(
top_pair.into_inner(),
)
.map(|e| e.into())
}
Rule::remote_connection_expr => {
connection_expr_from_remote_connection_expr_pair(
top_pair.into_inner(),
)
.map(|e| e.into())
}
Rule::tunneled_connection_expr => {
connection_expr_from_tunneled_connection_expr_pair(
top_pair.into_inner(),
)
.map(|e| e.into())
}
Rule::host_key_expr => {
Ok(ConnectionExpr::HostKey(top_pair.as_str().to_string()))
}
_ => unreachable!(
r#"grammar guarantees a local, remote, or tunneled route
expression to a remote host, or a host key reference"#
),
}
}
}
fn connection_expr_from_local_connection_expr_pair(
mut pairs: Pairs<Rule>,
) -> Result<RouteExpr, ParseError> {
Ok(RouteExpr {
ports: pairs
.next()
.expect("grammar guarantees a port set")
.try_into()
.map_err(|_| ParseError)?,
addr: None,
tunnel: None,
})
}
fn connection_expr_from_remote_connection_expr_pair(
mut pairs: Pairs<Rule>,
) -> Result<RouteExpr, ParseError> {
let addr = pairs
.next()
.expect("grammar guarantees an address")
.try_into()
.expect("grammar guarantees the address is legal");
let mut connection_expr = connection_expr_from_local_connection_expr_pair(
pairs
.next()
.expect("grammar guarantees a local port expression")
.into_inner(),
)?;
connection_expr.addr = Some(addr);
Ok(connection_expr)
}
fn connection_expr_from_tunneled_connection_expr_pair(
pairs: Pairs<Rule>,
) -> Result<RouteExpr, ParseError> {
let (tunnel, mut pairs) = tunnel_from_pairs(pairs)?;
let mut connection_expr = connection_expr_from_remote_connection_expr_pair(
pairs
.next()
.expect("grammar guarantees a remote port expression")
.into_inner(),
)?;
connection_expr.tunnel = Some(tunnel);
Ok(connection_expr)
}
fn tunnel_from_pairs(
mut pairs: Pairs<Rule>,
) -> Result<(TunnelExpr, Pairs<Rule>), ParseError> {
let mut next = pairs.next().expect("grammar guarantees a user or address");
let user = if matches!(next.as_rule(), Rule::user) {
let s = next.as_str().to_owned();
next = pairs.next().expect("grammar guarantees an address");
Some(s)
} else {
None
};
match next.as_rule() {
Rule::addr => Ok((
TunnelExpr {
user,
addr: next
.try_into()
.expect("grammar guarantess addr is legal"),
ports: None,
},
pairs,
)),
Rule::addr_and_port => {
let mut inner = next.into_inner();
let addr = inner
.next()
.expect("addr by grammar")
.try_into()
.expect("correct by gramma");
let ports = inner
.next()
.expect("port_set by grammar")
.try_into()
.map_err(|_| ParseError)?;
Ok((
TunnelExpr {
user,
addr,
ports: Some(ports),
},
pairs,
))
}
_ => unreachable!("grammar guarantees addr or addr_and_port"),
}
}
#[derive(Debug, PartialEq, thiserror::Error)]
#[error("parse error")]
pub struct ParseError;
#[cfg(test)]
mod test {
use super::*;
use std::net;
fn ps(ports: &[u16]) -> PortSet {
maybe_ps(ports).unwrap()
}
fn maybe_ps(ports: &[u16]) -> Option<PortSet> {
PortSet::try_from_iter(ports.iter().cloned())
}
fn ip4(a: u8, b: u8, c: u8, d: u8) -> Addr {
Addr::IP(net::Ipv4Addr::new(a, b, c, d).into())
}
fn ip6(
a: u16,
b: u16,
c: u16,
d: u16,
e: u16,
f: u16,
g: u16,
h: u16,
) -> Addr {
Addr::IP(net::Ipv6Addr::new(a, b, c, d, e, f, g, h).into())
}
fn dom(domain: &str) -> Addr {
Addr::Domain(domain.to_owned())
}
#[test]
fn local_connection_expr_parsing() {
let mk = |ports| {
Ok(ConnectionExpr::RouteExpr(RouteExpr {
ports: ps(ports),
addr: None,
tunnel: None,
}))
};
assert_eq!("1".parse(), mk(&[1]));
assert_eq!("1,2".parse(), mk(&[1, 2]));
assert_eq!("1-3".parse(), mk(&[1, 2, 3]));
assert_eq!("1,3,1-3".parse(), mk(&[1, 3, 2]));
}
#[test]
fn remote_connection_expr_parsing() {
let mk = |addr, ports| {
Ok(ConnectionExpr::RouteExpr(RouteExpr {
ports: ps(ports),
addr: Some(addr),
tunnel: None,
}))
};
assert_eq!("1.2.3.4:1,2-3".parse(), mk(ip4(1, 2, 3, 4), &[1, 2, 3]));
assert_eq!(
"[0:dead::beef:0]:1,2-3".parse(),
mk(ip6(0, 0xDEAD, 0, 0, 0, 0, 0xBEEF, 0), &[1, 2, 3])
);
assert_eq!("localhost:1,2-3".parse(), mk(dom("localhost"), &[1, 2, 3]));
}
#[test]
fn tunneled_connection_expr_parsing() {
let mk = |tunnel_user: Option<&str>,
tunnel_addr,
tunnel_ports: &[u16],
server_addr,
server_ports| {
Ok(ConnectionExpr::RouteExpr(RouteExpr {
ports: ps(server_ports),
addr: Some(server_addr),
tunnel: Some(TunnelExpr {
user: tunnel_user.map(|s| s.to_owned()),
addr: tunnel_addr,
ports: maybe_ps(tunnel_ports),
}),
}))
};
assert_eq!(
"1.2.3.4:5.6.7.8:9".parse(),
mk(None, ip4(1, 2, 3, 4), &[], ip4(5, 6, 7, 8), &[9])
);
assert_eq!(
"1.2.3.4:5:6.7.8.9:10".parse(),
mk(None, ip4(1, 2, 3, 4), &[5], ip4(6, 7, 8, 9), &[10])
);
assert_eq!(
"1.2.3.4:5,6-7:8.9.10.11:12-14,15-16".parse(),
mk(
None,
ip4(1, 2, 3, 4),
&[5, 6, 7],
ip4(8, 9, 10, 11),
&[12, 13, 14, 15, 16]
)
);
assert_eq!(
"a@1.2.3.4:5.6.7.8:9".parse(),
mk(Some("a"), ip4(1, 2, 3, 4), &[], ip4(5, 6, 7, 8), &[9])
);
assert_eq!(
"a@1.2.3.4:5:6.7.8.9:10".parse(),
mk(Some("a"), ip4(1, 2, 3, 4), &[5], ip4(6, 7, 8, 9), &[10])
);
assert_eq!(
"[::]:[::]:1".parse(),
mk(
None,
ip6(0, 0, 0, 0, 0, 0, 0, 0),
&[],
ip6(0, 0, 0, 0, 0, 0, 0, 0),
&[1]
)
);
assert_eq!(
"[::]:1:[::]:1".parse(),
mk(
None,
ip6(0, 0, 0, 0, 0, 0, 0, 0),
&[1],
ip6(0, 0, 0, 0, 0, 0, 0, 0),
&[1]
)
);
assert_eq!(
"a@[1:2:3:4:5:6:7:8]:9:[10:11:12:13:14:15:16:17]:18".parse(),
mk(
Some("a"),
ip6(0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08),
&[9],
ip6(0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17),
&[18]
)
);
assert_eq!(
"a@b.c.d:e.f.g:1".parse(),
mk(Some("a"), dom("b.c.d"), &[], dom("e.f.g"), &[1])
);
assert_eq!(
"a@b.c.d.:1:e.f.g.:2".parse(),
mk(Some("a"), dom("b.c.d."), &[1], dom("e.f.g."), &[2])
);
}
#[test]
fn host_key_expr_parsing() {
let mk = |key: &str| Ok(ConnectionExpr::HostKey(key.to_owned()));
assert_eq!("x".parse(), mk("x"));
assert_eq!("my_prod_host_1".parse(), mk("my_prod_host_1"));
}
}