Crate trust_dns_resolver [] [src]

The Resolver is responsible for performing recursive queries to lookup domain names.

This is a 100% in process DNS resolver. It does not use the Host OS' resolver. If what is desired is to use the Host OS' resolver, generally in the system's libc, then the std::net::ToSocketAddrs variant over &str is what should be used. As of the initial release, trust-dns-resolver it does not currently support search paths or ndot recursive lookups. It only supports FQDN, where the name must be specified with the final dot, e.g. www.example.com.. This limitation will be removed in future releases.

Unlike the trust-dns client, this tries to provide a simpler interface to perform DNS queries. For update options, i.e. Dynamic DNS, the trust-dns crate must be used directly.

There are two types for performing DNS queries, Resolver and ResolverFuture. Resolver is the easiest to work with, it is a wrapper around ResolverFuture. ResolverFuture is a Tokio based async resolver, and can be used inside any Tokio based system.

Notes on current limitations: DNSSec is not yet supported in the Resolver, use the trust-dns Client if DNSSec validation is needed. Many standard system options and configurations are not yet supported. The host system /etc/resolv.conf is not yet being used. Recursion is not yet built, i.e. CNAME chains will not be fully resolved if an address is not returned. IPv6 lookups are not included in queries. Due to many of these limitations, you may not yet want to use this library.

This as best as possible attempts to abide by the the DNS RFCs, please file issues at https://github.com/bluejekyll/trust-dns .

Example

use std::net::*;
use trust_dns_resolver::Resolver;
use trust_dns_resolver::config::*;

let mut resolver = Resolver::new(ResolverConfig::default(), ResolverOpts::default()).unwrap();
 
// NOTE: do not forget the final dot, as the resolver does not yet support search paths.
let mut response = resolver.lookup_ip("www.example.com.").unwrap();

let address = response.next().expect("no addresses returned!");
assert_eq!(address, IpAddr::V4(Ipv4Addr::new(93, 184, 216, 34))); 

Modules

config

Configuration for a resolver

lookup_ip

LookupHost result from a resolution with a Resolver

Structs

Resolver

The Resolver is used for performing DNS queries.

ResolverFuture

A Resolver for DNS records.

Functions

version

Get the version of this application as specified in the Cargo.toml