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
use std::fs::File;
use std::io;
use std::io::Read;
use std::net::SocketAddr;
use std::path::Path;
use std::str::FromStr;
use std::time::Duration;
use resolv_conf;
use crate::config::*;
use crate::proto::rr::Name;
const DEFAULT_PORT: u16 = 53;
pub fn read_system_conf() -> io::Result<(ResolverConfig, ResolverOpts)> {
read_resolv_conf("/etc/resolv.conf")
}
fn read_resolv_conf<P: AsRef<Path>>(path: P) -> io::Result<(ResolverConfig, ResolverOpts)> {
let mut data = String::new();
let mut file = File::open(path)?;
file.read_to_string(&mut data)?;
parse_resolv_conf(&data)
}
fn parse_resolv_conf<T: AsRef<[u8]>>(data: T) -> io::Result<(ResolverConfig, ResolverOpts)> {
let parsed_conf = resolv_conf::Config::parse(&data).map_err(|e| {
io::Error::new(
io::ErrorKind::Other,
format!("Error parsing resolv.conf: {:?}", e),
)
})?;
into_resolver_config(parsed_conf)
}
fn into_resolver_config(
parsed_config: resolv_conf::Config,
) -> io::Result<(ResolverConfig, ResolverOpts)> {
let domain = if let Some(domain) = parsed_config.get_system_domain() {
Some(Name::from_str(domain.as_str())?)
} else {
None
};
let mut nameservers = Vec::<NameServerConfig>::with_capacity(parsed_config.nameservers.len());
for ip in &parsed_config.nameservers {
nameservers.push(NameServerConfig {
socket_addr: SocketAddr::new(ip.into(), DEFAULT_PORT),
protocol: Protocol::Udp,
tls_dns_name: None,
trust_nx_responses: false,
#[cfg(feature = "dns-over-rustls")]
tls_config: None,
bind_addr: None,
});
nameservers.push(NameServerConfig {
socket_addr: SocketAddr::new(ip.into(), DEFAULT_PORT),
protocol: Protocol::Tcp,
tls_dns_name: None,
trust_nx_responses: false,
#[cfg(feature = "dns-over-rustls")]
tls_config: None,
bind_addr: None,
});
}
if nameservers.is_empty() {
warn!("no nameservers found in config");
}
let mut search = vec![];
for search_domain in parsed_config.get_last_search_or_domain() {
search.push(Name::from_str_relaxed(&search_domain).map_err(|e| {
io::Error::new(
io::ErrorKind::Other,
format!("Error parsing resolv.conf: {:?}", e),
)
})?);
}
let config = ResolverConfig::from_parts(domain, search, nameservers);
let options = ResolverOpts {
ndots: parsed_config.ndots as usize,
timeout: Duration::from_secs(u64::from(parsed_config.timeout)),
attempts: parsed_config.attempts as usize,
..ResolverOpts::default()
};
Ok((config, options))
}
#[cfg(test)]
mod tests {
use super::*;
use proto::rr::Name;
use std::env;
use std::net::*;
use std::str::FromStr;
fn empty_config() -> ResolverConfig {
ResolverConfig::from_parts(None, vec![], vec![])
}
fn nameserver_config(ip: &str) -> [NameServerConfig; 2] {
let addr = SocketAddr::new(IpAddr::from_str(ip).unwrap(), 53);
[
NameServerConfig {
socket_addr: addr,
protocol: Protocol::Udp,
tls_dns_name: None,
trust_nx_responses: false,
#[cfg(feature = "dns-over-rustls")]
tls_config: None,
bind_addr: None,
},
NameServerConfig {
socket_addr: addr,
protocol: Protocol::Tcp,
tls_dns_name: None,
trust_nx_responses: false,
#[cfg(feature = "dns-over-rustls")]
tls_config: None,
bind_addr: None,
},
]
}
fn tests_dir() -> String {
let server_path = env::var("TDNS_WORKSPACE_ROOT").unwrap_or_else(|_| "../..".to_owned());
format!("{}/crates/resolver/tests", server_path)
}
#[test]
#[allow(clippy::redundant_clone)]
fn test_name_server() {
let parsed = parse_resolv_conf("nameserver 127.0.0.1").expect("failed");
let mut cfg = empty_config();
let nameservers = nameserver_config("127.0.0.1");
cfg.add_name_server(nameservers[0].clone());
cfg.add_name_server(nameservers[1].clone());
assert_eq!(cfg.name_servers(), parsed.0.name_servers());
assert_eq!(ResolverOpts::default(), parsed.1);
}
#[test]
fn test_search() {
let parsed = parse_resolv_conf("search localnet.").expect("failed");
let mut cfg = empty_config();
cfg.add_search(Name::from_str("localnet.").unwrap());
assert_eq!(cfg.search(), parsed.0.search());
assert_eq!(ResolverOpts::default(), parsed.1);
}
#[test]
fn test_underscore_in_search() {
let parsed = parse_resolv_conf("search Speedport_000").expect("failed");
let mut cfg = empty_config();
cfg.add_search(Name::from_str_relaxed("Speedport_000.").unwrap());
assert_eq!(cfg.search(), parsed.0.search());
assert_eq!(ResolverOpts::default(), parsed.1);
}
#[test]
fn test_domain() {
let parsed = parse_resolv_conf("domain example.com").expect("failed");
let mut cfg = empty_config();
cfg.set_domain(Name::from_str("example.com").unwrap());
assert_eq!(cfg, parsed.0);
assert_eq!(ResolverOpts::default(), parsed.1);
}
#[test]
fn test_read_resolv_conf() {
read_resolv_conf(format!("{}/resolv.conf-simple", tests_dir())).expect("simple failed");
read_resolv_conf(format!("{}/resolv.conf-macos", tests_dir())).expect("macos failed");
read_resolv_conf(format!("{}/resolv.conf-linux", tests_dir())).expect("linux failed");
}
}
