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Basic support for freebsd ipfw firewall #21

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Basic support for freebsd ipfw firewall #21

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3 changes: 3 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,9 @@ nft add rule nat prerouting tcp dport {80, 443} redirect to 2080
# or the legacy iptables equivalent
iptables -t nat -A OUTPUT -p tcp -m multiport --dports 80,443 -j REDIRECT --to-port 2080
iptables -t nat -A PREROUTING -p tcp -m multiport --dports 80,443 -j REDIRECT --to-port 2080

# or ipfw (FreeBSD)
ipfw add 100 fwd 127.0.0.1,2080 tcp from me to not me dst-port 80,443
```

SOCKSv5 server is also launched alongs with transparent proxy on the same port:
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9 changes: 9 additions & 0 deletions src/client/mod.rs
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Expand Up @@ -134,6 +134,12 @@ async fn accept_socks5(client: &mut TcpStream) -> io::Result<Destination> {
Ok((addr, port).into())
}

async fn transparent_dest(client: &mut TcpStream) -> io::Result<Destination> {
// Transparent firewall redirection (unmodified destination address)
// (for example, ipfw firewall with 'fwd' rule)
Ok((client.local_addr()?).into())
}

impl NewClient {
#[instrument(name = "retrieve_dest", skip_all)]
pub async fn from_socket(mut left: TcpStream, list: ServerList) -> io::Result<Self> {
Expand All @@ -152,6 +158,9 @@ impl NewClient {
#[cfg(not(target_os = "linux"))]
let dest: Option<SocketAddr> = None;

#[cfg(target_os = "freebsd")]
let dest = (transparent_dest(&mut left).await?).into();

let dest = if let Some(dest) = dest {
debug!(?dest, "Retrived destination via NAT info");
dest.into()
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