1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
use std::io::{BufRead, BufReader, Write};
use std::net::SocketAddr;
use std::net::{IpAddr, Ipv4Addr};
use std::net::{TcpListener, TcpStream};
pub struct TcpProxy {
pub forward_thread: std::thread::JoinHandle<()>,
}
impl TcpProxy {
pub fn new(listen_port: u16, proxy_to: SocketAddr) -> Result<Self, Box<dyn std::error::Error>> {
let listener_forward = TcpListener::bind(SocketAddr::new(
IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
listen_port,
))?;
let sender_forward_original = TcpStream::connect(proxy_to)?;
let sender_backward_original = sender_forward_original.try_clone()?;
let forward_thread = std::thread::spawn(move || {
loop {
let (stream_forward, _addr) = listener_forward
.accept()
.expect("Failed to accept connection");
let mut stream_backward =
stream_forward.try_clone().expect("Failed to clone stream");
let mut sender_forward = sender_forward_original.try_clone().unwrap();
let sender_backward = sender_backward_original.try_clone().unwrap();
std::thread::spawn(move || {
let mut stream_forward = BufReader::new(stream_forward);
loop {
let length = {
let buffer = stream_forward.fill_buf().unwrap();
let length = buffer.len();
if buffer.is_empty() {
return;
}
sender_forward
.write_all(&buffer)
.expect("Failed to write to remote");
sender_forward.flush().expect("Failed to flush remote");
length
};
stream_forward.consume(length);
}
});
let _backward_thread = std::thread::spawn(move || {
let mut sender_backward = BufReader::new(sender_backward);
loop {
let length = {
let buffer = sender_backward.fill_buf().unwrap();
let length = buffer.len();
if buffer.is_empty() {
return;
}
if stream_backward.write_all(&buffer).is_err() {
return;
}
stream_backward.flush().expect("Failed to flush locally");
length
};
sender_backward.consume(length);
}
});
}
});
Ok(Self { forward_thread })
}
}