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| 1 | +//! SOCKS proxy clients |
| 2 | +
|
| 3 | +use std::io; |
| 4 | +use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6, ToSocketAddrs}; |
| 5 | +use std::vec; |
| 6 | + |
| 7 | +pub use self::v4::{Socks4Listener, Socks4Stream}; |
| 8 | +pub use self::v5::{Socks5Datagram, Socks5Listener, Socks5Stream}; |
| 9 | + |
| 10 | +mod v4; |
| 11 | +mod v5; |
| 12 | +mod writev; |
| 13 | + |
| 14 | +/// A description of a connection target. |
| 15 | +#[derive(Debug, Clone)] |
| 16 | +pub enum TargetAddr { |
| 17 | + /// Connect to an IP address. |
| 18 | + Ip(SocketAddr), |
| 19 | + /// Connect to a fully qualified domain name. |
| 20 | + /// |
| 21 | + /// The domain name will be passed along to the proxy server and DNS lookup |
| 22 | + /// will happen there. |
| 23 | + Domain(String, u16), |
| 24 | +} |
| 25 | + |
| 26 | +impl ToSocketAddrs for TargetAddr { |
| 27 | + type Iter = Iter; |
| 28 | + |
| 29 | + fn to_socket_addrs(&self) -> io::Result<Iter> { |
| 30 | + let inner = match *self { |
| 31 | + TargetAddr::Ip(addr) => IterInner::Ip(Some(addr)), |
| 32 | + TargetAddr::Domain(ref domain, port) => { |
| 33 | + let it = (&**domain, port).to_socket_addrs()?; |
| 34 | + IterInner::Domain(it) |
| 35 | + } |
| 36 | + }; |
| 37 | + Ok(Iter(inner)) |
| 38 | + } |
| 39 | +} |
| 40 | + |
| 41 | +enum IterInner { |
| 42 | + Ip(Option<SocketAddr>), |
| 43 | + Domain(vec::IntoIter<SocketAddr>), |
| 44 | +} |
| 45 | + |
| 46 | +/// An iterator over `SocketAddr`s associated with a `TargetAddr`. |
| 47 | +pub struct Iter(IterInner); |
| 48 | + |
| 49 | +impl Iterator for Iter { |
| 50 | + type Item = SocketAddr; |
| 51 | + |
| 52 | + fn next(&mut self) -> Option<SocketAddr> { |
| 53 | + match self.0 { |
| 54 | + IterInner::Ip(ref mut addr) => addr.take(), |
| 55 | + IterInner::Domain(ref mut it) => it.next(), |
| 56 | + } |
| 57 | + } |
| 58 | +} |
| 59 | + |
| 60 | +/// A trait for objects that can be converted to `TargetAddr`. |
| 61 | +pub trait ToTargetAddr { |
| 62 | + /// Converts the value of `self` to a `TargetAddr`. |
| 63 | + fn to_target_addr(&self) -> io::Result<TargetAddr>; |
| 64 | +} |
| 65 | + |
| 66 | +impl ToTargetAddr for TargetAddr { |
| 67 | + fn to_target_addr(&self) -> io::Result<TargetAddr> { |
| 68 | + Ok(self.clone()) |
| 69 | + } |
| 70 | +} |
| 71 | + |
| 72 | +impl ToTargetAddr for SocketAddr { |
| 73 | + fn to_target_addr(&self) -> io::Result<TargetAddr> { |
| 74 | + Ok(TargetAddr::Ip(*self)) |
| 75 | + } |
| 76 | +} |
| 77 | + |
| 78 | +impl ToTargetAddr for SocketAddrV4 { |
| 79 | + fn to_target_addr(&self) -> io::Result<TargetAddr> { |
| 80 | + SocketAddr::V4(*self).to_target_addr() |
| 81 | + } |
| 82 | +} |
| 83 | + |
| 84 | +impl ToTargetAddr for SocketAddrV6 { |
| 85 | + fn to_target_addr(&self) -> io::Result<TargetAddr> { |
| 86 | + SocketAddr::V6(*self).to_target_addr() |
| 87 | + } |
| 88 | +} |
| 89 | + |
| 90 | +impl ToTargetAddr for (Ipv4Addr, u16) { |
| 91 | + fn to_target_addr(&self) -> io::Result<TargetAddr> { |
| 92 | + SocketAddrV4::new(self.0, self.1).to_target_addr() |
| 93 | + } |
| 94 | +} |
| 95 | + |
| 96 | +impl ToTargetAddr for (Ipv6Addr, u16) { |
| 97 | + fn to_target_addr(&self) -> io::Result<TargetAddr> { |
| 98 | + SocketAddrV6::new(self.0, self.1, 0, 0).to_target_addr() |
| 99 | + } |
| 100 | +} |
| 101 | + |
| 102 | +impl<'a> ToTargetAddr for (&'a str, u16) { |
| 103 | + fn to_target_addr(&self) -> io::Result<TargetAddr> { |
| 104 | + // try to parse as an IP first |
| 105 | + if let Ok(addr) = self.0.parse::<Ipv4Addr>() { |
| 106 | + return (addr, self.1).to_target_addr(); |
| 107 | + } |
| 108 | + |
| 109 | + if let Ok(addr) = self.0.parse::<Ipv6Addr>() { |
| 110 | + return (addr, self.1).to_target_addr(); |
| 111 | + } |
| 112 | + |
| 113 | + Ok(TargetAddr::Domain(self.0.to_owned(), self.1)) |
| 114 | + } |
| 115 | +} |
| 116 | + |
| 117 | +impl<'a> ToTargetAddr for &'a str { |
| 118 | + fn to_target_addr(&self) -> io::Result<TargetAddr> { |
| 119 | + // try to parse as an IP first |
| 120 | + if let Ok(addr) = self.parse::<SocketAddrV4>() { |
| 121 | + return addr.to_target_addr(); |
| 122 | + } |
| 123 | + |
| 124 | + if let Ok(addr) = self.parse::<SocketAddrV6>() { |
| 125 | + return addr.to_target_addr(); |
| 126 | + } |
| 127 | + |
| 128 | + // split the string by ':' and convert the second part to u16 |
| 129 | + let mut parts_iter = self.rsplitn(2, ':'); |
| 130 | + let port_str = match parts_iter.next() { |
| 131 | + Some(s) => s, |
| 132 | + None => { |
| 133 | + return Err(io::Error::new( |
| 134 | + io::ErrorKind::InvalidInput, |
| 135 | + "invalid socket address", |
| 136 | + )) |
| 137 | + } |
| 138 | + }; |
| 139 | + |
| 140 | + let host = match parts_iter.next() { |
| 141 | + Some(s) => s, |
| 142 | + None => { |
| 143 | + return Err(io::Error::new( |
| 144 | + io::ErrorKind::InvalidInput, |
| 145 | + "invalid socket address", |
| 146 | + )) |
| 147 | + } |
| 148 | + }; |
| 149 | + |
| 150 | + let port: u16 = match port_str.parse() { |
| 151 | + Ok(p) => p, |
| 152 | + Err(_) => { |
| 153 | + return Err(io::Error::new( |
| 154 | + io::ErrorKind::InvalidInput, |
| 155 | + "invalid port value", |
| 156 | + )) |
| 157 | + } |
| 158 | + }; |
| 159 | + |
| 160 | + (host, port).to_target_addr() |
| 161 | + } |
| 162 | +} |
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