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#![deny(missing_docs)]
extern crate trust_dns;
extern crate trust_dns_proto;
extern crate base64;
extern crate reqwest;
#[macro_use]
extern crate failure;
use std::str::FromStr;
use std::net::IpAddr;
use base64::encode;
use reqwest::header::Host;
use trust_dns::op::{Message, Query};
use trust_dns::rr::{Name, RecordType};
use trust_dns::rr::RData::*;
mod error;
use error::Error;
const DNS_HOSTNAME : &str = "dns.google.com";
const DNS_QUERY_URL : &str = "https://172.217.21.110/experimental";
pub fn resolve_host(host: &str) -> Result<Vec<IpAddr>, Error> {
let mut headers = reqwest::header::Headers::new();
headers.set(Host::new(DNS_HOSTNAME, None));
let client = reqwest::Client::builder()
.danger_disable_hostname_verification()
.default_headers(headers)
.build()?;
let mut ipv6 = resolve_host_family(&client, RecordType::AAAA, host)?;
let ipv4 = resolve_host_family(&client, RecordType::A, host)?;
ipv6.extend(ipv4);
Ok(ipv6)
}
fn resolve_host_family(client: &reqwest::Client, af: RecordType, name: &str) -> Result<Vec<IpAddr>, Error> {
let qname = Name::from_str(name)?;
let query = Query::query(qname, af);
let mut msg = Message::new();
msg.set_recursion_desired(true);
msg.add_query(query);
let qbuf = msg.to_vec()?;
let encoded = encode(&qbuf);
let mut resp = client.get(DNS_QUERY_URL)
.query(&[
("ct", ""),
("body", &encoded)
])
.send()?;
let mut body = Vec::new();
resp.copy_to(&mut body)?;
let msg = Message::from_vec(&body)?;
let results = msg.answers()
.iter()
.map(|answer| answer.rdata())
.flat_map(|data| {
match *data {
A(ipv4) => Some(IpAddr::V4(ipv4)),
AAAA(ipv6) => Some(IpAddr::V6(ipv6)),
_ => None
}
})
.collect();
Ok(results)
}