aralez/src/tls/acme/lookup.rs

use hickory_resolver::TokioResolver;
use hickory_resolver::config::{NameServerConfig, ResolverConfig, ResolverOpts};
use hickory_resolver::net::runtime::TokioRuntimeProvider;
use hickory_resolver::proto::rr::RData;
use log::info;
use std::net::IpAddr;
use std::str::FromStr;
use std::time::Duration;

pub async fn lookup_wait(record_name: &str, dns_server_ip: Option<&str>, max_wait_secs: u64, expected_value: &str) -> bool {
    let target_ip = dns_server_ip.and_then(|ip| IpAddr::from_str(ip).ok()).unwrap_or_else(|| IpAddr::from([1, 1, 1, 1]));
    let name_server = NameServerConfig::udp(target_ip);
    let config = ResolverConfig::from_name_servers(vec![name_server]);
    let mut opts = ResolverOpts::default();
    opts.cache_size = 0;

    let resolver = TokioResolver::builder_with_config(config, TokioRuntimeProvider::default())
        .with_options(opts)
        .build()
        .expect("failed to build DNS resolver");

    let start = std::time::Instant::now();
    let poll_interval = Duration::from_secs(3);
    while start.elapsed().as_secs() < max_wait_secs {
        if let Ok(txt_lookup) = resolver.txt_lookup(record_name).await {
            for record in txt_lookup.answers() {
                if let RData::TXT(txt) = &record.data {
                    for data in &txt.txt_data {
                        if let Ok(txt_str) = std::str::from_utf8(data) {
                            if txt_str == expected_value {
                                tokio::time::sleep(Duration::from_secs(5)).await;
                                info!("DNS record propagated successfully for {} : {}", record_name, txt_str);
                                return true;
                            }
                        }
                    }
                }
            }
        } else {
            info!("Waiting for TXT record {}", record_name);
        }
        tokio::time::sleep(poll_interval).await;
    }
    false
}