DNS resolution via glibc.
This uses libresolv.so
which is typically configured via /etc/resolv.conf
to do DNS
resolution. It allows you to look up DNS resource records of any type (e.g. A, AAAA, MX, TXT,
etc), use recursion (if your system's DNS resolver permits it), and perform the DNS search
algorithm to complete incomplete names and use your /etc/hosts
file.
extern crate resolv;
use resolv::{Resolver, Class, RecordType};
use resolv::record::MX;
fn main() {
// You must create a mutable resolver object to hold the context.
let mut resolver = Resolver::new().unwrap();
// .query() and .search() are the main interfaces to the resolver.
let mut response = resolver.query(b"gmail.com", Class::IN,
RecordType::MX).unwrap();
// You can iterate through answers as follows. You must specify the
// type of record. A run-time error will occur if the records
// decoded are of the wrong type.
for answer in response.answers::<MX>() {
println!("{:?}", answer);
}
}
You cannot specify a DNS server separate from editing /etc/resolv.conf
for the entire
system.
libresolv-sys
was generated from glibc version 2.23 on linux and may not be compatible with
older systems or systems of other flavours. Additionally, the thread-safe interfaces are used,
which may not be available on older systems. Pull requests which improve portability are
appreciated.
Not all NS record types are supported yet.
Licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.