Using trust-dns-resolver to do soa lookups -

	use trust_dns_resolver::error::ResolveResult;
	use trust_dns_resolver::Resolver;
	use trust_dns_resolver::{config::*, lookup::SoaLookup};

	fn main() {
	// Construct a new Resolver with default configuration options
	let resolver = Resolver::new(ResolverConfig::default(), ResolverOpts::default()).unwrap();

	let soa_response = resolver.soa_lookup("gmail.com.");

	display_soa(&soa_response);
	}

	fn display_soa(soa_response: &ResolveResult<SoaLookup>) {
	match soa_response {
	Err(_) => println!("No SOA."),
	Ok(soa_response) => {
	let soa_iter = soa_response.iter();
	for record in soa_iter {
	println!("Admin: {}", record.rname());
	let email = convert_rname_to_email_address(&record.rname().to_string());
	println!("Admin Email: {}", email);
	println!("Primary: {}", record.mname());
	println!("Serial: {}", record.serial());
	}
	}
	}
	}

	fn convert_rname_to_email_address(rname: &String) -> String {
	//Solution found on StackOverFlow :)
	let rname = rname.clone();
	let mut email_address: String = String::new();
	let mut splitter = rname.splitn(2, ".");
	email_address.push_str(splitter.next().unwrap());
	email_address.push_str("@");
	email_address.push_str(splitter.next().unwrap());
	// Remove remaining period (.)
	email_address.pop();
	email_address
	}

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