aboutsummaryrefslogtreecommitdiff
path: root/src/wg.rs
blob: 0335c3d031999ffc993622b7d7d57e854b12d669 (plain) (blame)
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
// Copyright 2019 Hristo Venev
//
// See COPYING.

use crate::{model};
use std::{env, io};
use std::ffi::{OsStr, OsString};
use std::process::{Command, Stdio};

pub struct Device {
    ifname: String,
}

impl Device {
    #[inline]
    pub fn new(ifname: String) -> io::Result<Self> {
        Ok(Device { ifname })
    }

    pub fn wg_command() -> Command {
        let wg = match env::var_os("WG") {
            None => OsString::new(),
            Some(v) => v,
        };

        Command::new(if wg.is_empty() {
            OsStr::new("wg")
        } else {
            wg.as_os_str()
        })
    }

    pub fn get_public_key(&self) -> io::Result<model::Key> {
        let mut proc = Device::wg_command();
        proc.stdin(Stdio::null());
        proc.stdout(Stdio::piped());
        proc.arg("show");
        proc.arg(&self.ifname);
        proc.arg("public-key");

        let r = proc.output()?;
        if !r.status.success() {
            return Err(io::Error::new(io::ErrorKind::Other, "Child process failed"));
        }

        let mut out = r.stdout;
        if out.ends_with(b"\n") {
            out.remove(out.len() - 1);
        }
        model::Key::from_bytes(&out)
            .map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Invalid public key"))
    }

    pub fn apply_diff(&mut self, old: &model::Config, new: &model::Config) -> io::Result<()> {
        let mut proc = Device::wg_command();
        proc.stdin(Stdio::piped());
        proc.arg("set");
        proc.arg(&self.ifname);

        let mut psks = String::new();

        for (pubkey, conf) in new.peers.iter() {
            let old_endpoint;
            if let Some(old_peer) = old.peers.get(pubkey) {
                if *old_peer == *conf {
                    continue;
                }
                old_endpoint = old_peer.endpoint.clone();
            } else {
                old_endpoint = None;
            }

            proc.arg("peer");
            proc.arg(format!("{}", pubkey));

            if old_endpoint != conf.endpoint {
                if let Some(ref endpoint) = conf.endpoint {
                    proc.arg("endpoint");
                    proc.arg(format!("{}", endpoint));
                }
            }

            if let Some(psk) = &conf.psk {
                proc.arg("preshared-key");
                proc.arg("/dev/stdin");
                {
                    use std::fmt::Write;
                    writeln!(&mut psks, "{}", psk).unwrap();
                }
            }

            let mut ips = String::new();
            {
                use std::fmt::Write;
                for ip in conf.ipv4.iter() {
                    if !ips.is_empty() {
                        ips.push(',');
                    }
                    write!(ips, "{}", ip).unwrap();
                }
                for ip in conf.ipv6.iter() {
                    if !ips.is_empty() {
                        ips.push(',');
                    }
                    write!(ips, "{}", ip).unwrap();
                }
            }

            proc.arg("allowed-ips");
            proc.arg(ips);
        }

        for pubkey in old.peers.keys() {
            if new.peers.contains_key(pubkey) {
                continue;
            }
            proc.arg("peer");
            proc.arg(format!("{}", pubkey));
            proc.arg("remove");
        }

        let mut proc = proc.spawn()?;
        {
            use std::io::Write;
            let stdin = proc.stdin.as_mut().unwrap();
            write!(stdin, "{}", psks)?;
        }

        let r = proc.wait()?;
        if !r.success() {
            return Err(io::Error::new(io::ErrorKind::Other, "Child process failed"));
        }
        Ok(())
    }
}