4 releases
0.2.0 | Jan 21, 2020 |
---|---|
0.1.2 | Oct 25, 2019 |
0.1.1 | Oct 25, 2019 |
0.1.0 | Oct 25, 2019 |
#9 in #doh
21 downloads per month
46KB
904 lines
doh-dns
A library to make DNS over HTTPS requests.
Overview
This DNS over HTTPS (DoH) library queries public DoH servers provided by Google and Clouflare. It is based on async/await
with the help of hyper
and tokio
.
The library supports timeouts and retries which can be fully customized. A utility in the dohdns
directory is provided in this crate to use this library in the command line.
Quick Start
To quickly get started, a default client can be created with Dns:default()
and A
records can be queried using Dns::resolve_a()
. The default resolvers use Google first with a timeout of 3 seconds and Clouflare second with a timeout of 10 seconds. Note: Cloudlare does not support queries for ANY
records. You can use the Google resolver for that.
Example
use doh_dns::{client::HyperDnsClient, Dns, DnsHttpsServer};
use std::time::Duration;
use tokio;
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
// The following sets up the main DoH server to be Google with a default timeout
// of 2 seconds. If a retry is needed, the Cloudflare's 1.1.1.1 server is used.
// Alternatively, the default server setup can be used with:
// let dns = Dns::default();
let dns: Dns<HyperDnsClient> = Dns::with_servers(&[
DnsHttpsServer::Google(Duration::from_secs(2)),
DnsHttpsServer::Cloudflare1_1_1_1(Duration::from_secs(10)),
])
.unwrap();
match dns.resolve_a("www.cloudflare.com").await {
Ok(responses) => {
if responses.is_empty() {
println!("No entries found.");
} else {
for res in responses {
println!(
"name: {}, type: {}, TTL: {}, data: {}",
res.name,
dns.rtype_to_name(res.r#type),
res.TTL,
res.data
);
}
}
}
Err(err) => println!("Error: {}", err),
}
Ok(())
}
Logging
This library uses the log
crate to log errors during retries. Please see that create on methods on display such errors. If no logger is setup, nothing will be logged.
Dependencies
~10–21MB
~320K SLoC