rathole 0.1.0

A reverse proxy for NAT traversal
Documentation 
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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149

mod cli;
mod client;
mod config;
mod helper;
mod multi_map;
mod protocol;
mod server;
mod transport;

pub use cli::Cli;
pub use config::Config;

use anyhow::{anyhow, Result};
use tokio::sync::broadcast;
use tracing::debug;

use client::run_client;
use server::run_server;

pub async fn run(args: &Cli, shutdown_rx: broadcast::Receiver<bool>) -> Result<()> {
    let config = Config::from_file(&args.config_path).await?;

    debug!("{:?}", config);

    // Raise `nofile` limit on linux and mac
    fdlimit::raise_fd_limit();

    match determine_run_mode(&config, args) {
        RunMode::Undetermine => Err(anyhow!("Cannot determine running as a server or a client")),
        RunMode::Client => run_client(&config, shutdown_rx).await,
        RunMode::Server => run_server(&config, shutdown_rx).await,
    }
}

#[derive(PartialEq, Eq, Debug)]
enum RunMode {
    Server,
    Client,
    Undetermine,
}

fn determine_run_mode(config: &Config, args: &Cli) -> RunMode {
    use RunMode::*;
    if args.client && args.server {
        Undetermine
    } else if args.client {
        Client
    } else if args.server {
        Server
    } else if config.client.is_some() && config.server.is_none() {
        Client
    } else if config.server.is_some() && config.client.is_none() {
        Server
    } else {
        Undetermine
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_determine_run_mode() {
        use config::*;
        use RunMode::*;

        struct T {
            cfg_s: bool,
            cfg_c: bool,
            arg_s: bool,
            arg_c: bool,
            run_mode: RunMode,
        }

        let tests = [
            T {
                cfg_s: false,
                cfg_c: false,
                arg_s: false,
                arg_c: false,
                run_mode: Undetermine,
            },
            T {
                cfg_s: true,
                cfg_c: false,
                arg_s: false,
                arg_c: false,
                run_mode: Server,
            },
            T {
                cfg_s: false,
                cfg_c: true,
                arg_s: false,
                arg_c: false,
                run_mode: Client,
            },
            T {
                cfg_s: true,
                cfg_c: true,
                arg_s: false,
                arg_c: false,
                run_mode: Undetermine,
            },
            T {
                cfg_s: true,
                cfg_c: true,
                arg_s: true,
                arg_c: false,
                run_mode: Server,
            },
            T {
                cfg_s: true,
                cfg_c: true,
                arg_s: false,
                arg_c: true,
                run_mode: Client,
            },
            T {
                cfg_s: true,
                cfg_c: true,
                arg_s: true,
                arg_c: true,
                run_mode: Undetermine,
            },
        ];

        for t in tests {
            let config = Config {
                server: match t.cfg_s {
                    true => Some(ServerConfig::default()),
                    false => None,
                },
                client: match t.cfg_c {
                    true => Some(ClientConfig::default()),
                    false => None,
                },
            };

            let args = Cli {
                config_path: std::path::PathBuf::new(),
                server: t.arg_s,
                client: t.arg_c,
            };

            assert_eq!(determine_run_mode(&config, &args), t.run_mode);
        }
    }
}