Quad9 dns instead of system dns

Cargo.lock

@@ -3699,6 +3699,7 @@ dependencies = [
  "tracing-appender",
  "tracing-futures",
  "tracing-subscriber",
+ "trust-dns-resolver",
  "url 2.2.1",
  "uuid",
  "void",

swap/Cargo.toml

@@ -56,6 +56,7 @@ tracing = { version = "0.1", features = ["attributes"] }
 tracing-appender = "0.1"
 tracing-futures = { version = "0.2", features = ["std-future", "futures-03"] }
 tracing-subscriber = { version = "0.2", default-features = false, features = ["fmt", "ansi", "env-filter", "chrono", "tracing-log"] }
+trust-dns-resolver = "0.20"
 url = { version = "2", features = ["serde"] }
 uuid = { version = "0.8", features = ["serde", "v4"] }
 void = "1"

swap/src/network/transport.rs

@@ -23,7 +23,9 @@ pub fn build(id_keys: &identity::Keypair) -> Result<SwapTransport> {
     let noise = NoiseConfig::xx(dh_keys).into_authenticated();
 
     let tcp = TokioTcpConfig::new().nodelay(true);
-    let dns = TokioDnsConfig::system(tcp)?;
+    let config = trust_dns_resolver::config::ResolverConfig::quad9();
+    let opts = trust_dns_resolver::config::ResolverOpts::default();
+    let dns = TokioDnsConfig::custom(tcp, config, opts)?;
     let websocket = WsConfig::new(dns.clone());
 
     let transport = websocket