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feat(socks5): Support binding IP-CDIR when connecting (#29)
* refactor(serve): Refactor the validation module * feat(socks5): Support binding IP-CDIR when connecting * Update
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| use cidr::Ipv6Cidr; | ||
| use hyper_util::client::legacy::connect::HttpConnector; | ||
| use rand::Rng; | ||
| use std::net::{IpAddr, Ipv6Addr, SocketAddr}; | ||
| use tokio::net::{lookup_host, TcpSocket, TcpStream}; | ||
|
|
||
| #[derive(Clone)] | ||
| pub struct Connector { | ||
| cidr: Option<Ipv6Cidr>, | ||
| fallback: Option<IpAddr>, | ||
| } | ||
|
|
||
| impl Connector { | ||
| pub(super) fn new(cidr: Option<Ipv6Cidr>, fallback: Option<IpAddr>) -> Self { | ||
| Connector { cidr, fallback } | ||
| } | ||
|
|
||
| pub fn new_http_connector(&self) -> HttpConnector { | ||
| let mut connector = HttpConnector::new(); | ||
|
|
||
| match (self.cidr, self.fallback) { | ||
| (Some(v6), Some(IpAddr::V4(v4))) => { | ||
| let v6 = get_rand_ipv6(v6.first_address().into(), v6.network_length()); | ||
| connector.set_local_addresses(v4, v6); | ||
| } | ||
| (Some(v6), None) => { | ||
| let v6 = get_rand_ipv6(v6.first_address().into(), v6.network_length()); | ||
| connector.set_local_address(Some(v6.into())); | ||
| } | ||
| // ipv4 or ipv6 | ||
| (None, Some(ip)) => connector.set_local_address(Some(ip)), | ||
| _ => {} | ||
| } | ||
|
|
||
| connector | ||
| } | ||
|
|
||
| /// Attempts to establish a connection to a given SocketAddr. | ||
| /// If an IPv6 subnet and a fallback IP are provided, it will attempt to | ||
| /// connect using them. If no IPv6 subnet is provided but a fallback IP | ||
| /// is, it will attempt to connect using the fallback IP. If neither are | ||
| /// provided, it will attempt to connect directly to the given SocketAddr. | ||
| pub async fn try_connect(&self, addr: SocketAddr) -> std::io::Result<TcpStream> { | ||
| match (self.cidr, self.fallback) { | ||
| (Some(ipv6_cidr), ip_addr) => { | ||
| try_connect_with_ipv6_and_fallback(addr, ipv6_cidr, ip_addr).await | ||
| } | ||
| (None, Some(ip)) => try_connect_with_fallback(addr, ip).await, | ||
| _ => TcpStream::connect(addr).await, | ||
| } | ||
| } | ||
|
|
||
| /// Attempts to establish a connection to a given domain and port. | ||
| /// It first resolves the domain, then tries to connect to each resolved | ||
| /// address, until it successfully connects to an address or has tried | ||
| /// all addresses. If all connection attempts fail, it will return the | ||
| /// error from the last attempt. If no connection attempts were made, it | ||
| /// will return a new `Error` object. | ||
| pub async fn try_connect_for_domain( | ||
| &self, | ||
| domain: String, | ||
| port: u16, | ||
| ) -> std::io::Result<TcpStream> { | ||
| let mut last_err = None; | ||
|
|
||
| for target_addr in lookup_host((domain, port)).await? { | ||
| match self.try_connect(target_addr).await { | ||
| Ok(stream) => return Ok(stream), | ||
| Err(e) => last_err = Some(e), | ||
| }; | ||
| } | ||
|
|
||
| match last_err { | ||
| Some(e) => Err(e), | ||
| None => Err(std::io::Error::new( | ||
| std::io::ErrorKind::ConnectionAborted, | ||
| "Failed to connect to any resolved address", | ||
| )), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Try to connect with ipv6 and fallback to ipv4/ipv6 | ||
| async fn try_connect_with_ipv6_and_fallback( | ||
| target_addr: SocketAddr, | ||
| cidr: Ipv6Cidr, | ||
| fallback: Option<IpAddr>, | ||
| ) -> std::io::Result<TcpStream> { | ||
| let socket = TcpSocket::new_v6()?; | ||
| let bind_addr = SocketAddr::new( | ||
| get_rand_ipv6(cidr.first_address().into(), cidr.network_length()).into(), | ||
| 0, | ||
| ); | ||
| socket.bind(bind_addr)?; | ||
|
|
||
| // Try to connect with ipv6 | ||
| match socket.connect(target_addr).await { | ||
| Ok(first) => Ok(first), | ||
| Err(err) => { | ||
| tracing::debug!("try connect with ipv6 failed: {}", err); | ||
| if let Some(ip) = fallback { | ||
| // Try to connect with fallback ip (ipv4 or ipv6) | ||
| let socket = create_socket_for_ip(ip)?; | ||
| let bind_addr = SocketAddr::new(ip, 0); | ||
| socket.bind(bind_addr)?; | ||
| socket.connect(target_addr).await | ||
| } else { | ||
| // Try to connect with system default ip | ||
| TcpStream::connect(target_addr).await | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Try to connect with fallback to ipv4/ipv6 | ||
| async fn try_connect_with_fallback( | ||
| target_addr: SocketAddr, | ||
| ip: IpAddr, | ||
| ) -> std::io::Result<TcpStream> { | ||
| let socket = create_socket_for_ip(ip)?; | ||
| let bind_addr = SocketAddr::new(ip, 0); | ||
| socket.bind(bind_addr)?; | ||
| socket.connect(target_addr).await | ||
| } | ||
|
|
||
| /// Create a socket for ip | ||
| fn create_socket_for_ip(ip: IpAddr) -> std::io::Result<TcpSocket> { | ||
| match ip { | ||
| IpAddr::V4(_) => TcpSocket::new_v4(), | ||
| IpAddr::V6(_) => TcpSocket::new_v6(), | ||
| } | ||
| } | ||
|
|
||
| /// Get a random ipv6 address | ||
| fn get_rand_ipv6(mut ipv6: u128, prefix_len: u8) -> Ipv6Addr { | ||
| let rand: u128 = rand::thread_rng().gen(); | ||
| let net_part = (ipv6 >> (128 - prefix_len)) << (128 - prefix_len); | ||
| let host_part = (rand << prefix_len) >> prefix_len; | ||
| ipv6 = net_part | host_part; | ||
| ipv6.into() | ||
| } |
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