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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
// Copyright 2019 Hristo Venev
//
// See COPYING.
#[macro_use]
extern crate arrayref;
use std::io;
use std::time::{Duration, Instant, SystemTime};
mod bin;
mod config;
mod ip;
mod proto;
mod wg;
struct Source {
config: config::Source,
data: Option<proto::Source>,
next_update: Instant,
backoff: Option<u32>,
}
impl Source {
fn new(config: config::Source) -> Source {
Source {
config,
data: None,
next_update: Instant::now(),
backoff: None,
}
}
}
pub struct Device {
dev: wg::Device,
peer_config: config::PeerConfig,
update_config: config::UpdateConfig,
sources: Vec<Source>,
current: wg::Config,
curl_command: String,
}
impl Device {
pub fn new(c: config::Config) -> Device {
let dev = wg::Device::new(c.ifname, c.wg_command);
let current = wg::ConfigBuilder::new(&c.peers).build();
Device {
dev,
peer_config: c.peers,
update_config: c.update,
sources: c.sources.into_iter().map(Source::new).collect(),
current,
curl_command: c.curl_command,
}
}
fn make_config(&self, ts: SystemTime) -> (wg::Config, Vec<wg::ConfigError>, SystemTime) {
let mut next_update = ts + Duration::from_secs(3600);
let mut sources: Vec<(&Source, &proto::SourceConfig)> = vec![];
for src in self.sources.iter() {
if let Some(ref data) = src.data {
let sc = data
.next
.as_ref()
.and_then(|next| {
if ts >= next.update_at {
Some(&next.config)
} else {
next_update = next_update.min(next.update_at);
None
}
})
.unwrap_or(&data.config);
sources.push((src, sc));
}
}
let mut cfg = wg::ConfigBuilder::new(&self.peer_config);
let mut errs = vec![];
for (src, sc) in sources.iter() {
for peer in sc.servers.iter() {
cfg.add_server(&mut errs, &src.config, peer);
}
}
for (src, sc) in sources.iter() {
for peer in sc.road_warriors.iter() {
cfg.add_road_warrior(&mut errs, &src.config, peer);
}
}
let cfg = cfg.build();
(cfg, errs, next_update)
}
pub fn update(&mut self) -> io::Result<Instant> {
let now = Instant::now();
let refresh = self.update_config.refresh_period;
let after_refresh = now + Duration::from_secs(u64::from(refresh));
let mut next_update = after_refresh;
for src in self.sources.iter_mut() {
if now < src.next_update {
next_update = next_update.min(src.next_update);
continue;
}
let r = match fetch_source(&self.curl_command, &src.config.url) {
Ok(r) => {
eprintln!("<6>Updated [{}]", &src.config.url);
src.data = Some(r);
src.backoff = None;
src.next_update = after_refresh;
continue;
}
Err(r) => r,
};
eprintln!("<3>Failed to update [{}]: {}", &src.config.url, &r);
let b = src.backoff.unwrap_or(if src.data.is_some() {
refresh / 3
} else {
u32::min(10, refresh / 10)
});
let b = (b + b / 3).min(refresh);
src.backoff = Some(b);
src.next_update = now + Duration::from_secs(u64::from(b));
next_update = next_update.min(src.next_update);
}
let sysnow = SystemTime::now();
let (config, errors, upd_time) = self.make_config(sysnow);
let time_to_upd = upd_time
.duration_since(sysnow)
.unwrap_or(Duration::from_secs(0));
next_update = next_update.min(now + time_to_upd);
if config != self.current {
eprintln!("<5>Applying configuration update");
for err in errors.iter() {
eprintln!("<{}>{}", if err.important { '4' } else { '5' }, err);
}
self.dev.apply_diff(&self.current, &config)?;
self.current = config;
}
eprintln!("<6>Next configuration update after {:?}", time_to_upd);
Ok(next_update)
}
}
fn fetch_source(curl_command: &str, url: &str) -> io::Result<proto::Source> {
use std::process::{Command, Stdio};
let out = Command::new(curl_command)
.stdin(Stdio::null())
.stdout(Stdio::piped())
.stderr(Stdio::null())
.arg("--fail")
.arg("--fail-early")
.arg("--")
.arg(url)
.output()?;
if !out.status.success() {
return Err(io::Error::new(io::ErrorKind::Other, format!("Failed to download [{}]", url)));
}
let mut de = serde_json::Deserializer::from_slice(&out.stdout);
let r = serde::Deserialize::deserialize(&mut de)?;
Ok(r)
}
fn load_config(path: &str) -> io::Result<config::Config> {
use serde_json;
use std::fs;
let config_file = fs::File::open(path)?;
let rd = io::BufReader::new(config_file);
let mut de = serde_json::Deserializer::from_reader(rd);
Ok(serde::Deserialize::deserialize(&mut de)?)
}
fn main() {
use std::{env, process, thread};
let args: Vec<String> = env::args().collect();
if args.len() != 2 {
let arg0 = if !args.is_empty() { &args[0] } else { "wgconf" };
eprintln!("<1>Usage:");
eprintln!("<1> {} CONFIG", arg0);
process::exit(1);
}
let config = match load_config(&args[1]) {
Ok(c) => c,
Err(e) => {
eprintln!("<1>Failed to load config: {}", e);
process::exit(1);
}
};
let mut dev = Device::new(config);
loop {
let tm = match dev.update() {
Ok(t) => t,
Err(e) => {
eprintln!("<1>{}", e);
process::exit(1);
}
};
let now = Instant::now();
let sleep = tm.duration_since(now);
println!("Sleeping for {:?}", sleep);
thread::sleep(sleep);
}
}
|
