dns-lookup

A small wrapper for libc to perform simple DNS lookups.

You can use the lookup_host function to get a list of IP Addresses for a given hostname, and the lookup_name function to get the reverse dns entry for the given IP Address.

Documentation

Usage

Simple API

```rust use dnslookup::{lookuphost, lookup_addr};

{ let hostname = "localhost"; let ips: Vec = lookup_host(hostname).unwrap(); assert!(ips.contains(&"127.0.0.1".parse().unwrap())); }

{ let ip: std::net::IpAddr = "127.0.0.1".parse().unwrap(); let hostname = lookupaddr(&ip).unwrap(); asserteq!(hostname, "localhost"); } ```

libc API

```rust { use dns_lookup::{getaddrinfo, AddrInfoHints};

let hostname = "localhost"; let service = "ssh"; let hints = AddrInfoHints { socktype: dns_lookup::SockType::Stream, .. AddrInfoHints::default() }; let sockets = getaddrinfo(Some(hostname), Some(service), Some(hints)) .unwrap().collect::>>().unwrap(); println!("{:?}", sockets); for socket in sockets { // Try connecting to socket println!("{:?}", socket); } }

{ use dns_lookup::getnameinfo; use std::net::{IpAddr, SocketAddr};

let ip: IpAddr = "127.0.0.1".parse().unwrap(); let port = 22; let socket: SocketAddr = (ip, port).into();

let (name, service) = match getnameinfo(&socket, 0) { Ok((n, s)) => (n, s), Err(e) => panic!("Failed to lookup socket {:?}", e), };

println!("{:?} {:?}", name, service); let _ = (name, service); } ```