From d9453589ac75fed383a9962e1dd75c49fb3b206c Mon Sep 17 00:00:00 2001
From: Hs_Yeah <bYeahq@gmail.com>
Date: Wed, 9 Oct 2024 22:40:01 +0800
Subject: [PATCH] Fix panic when DNS resolution for STUN server returns only
 IPv6 addrs. (#402)

---
 easytier/src/common/stun.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/easytier/src/common/stun.rs b/easytier/src/common/stun.rs
index fedf404..86b957e 100644
--- a/easytier/src/common/stun.rs
+++ b/easytier/src/common/stun.rs
@@ -56,6 +56,8 @@ impl HostResolverIter {
                     self.ips = ips
                         .filter(|x| x.is_ipv4())
                         .choose_multiple(&mut rand::thread_rng(), self.max_ip_per_domain as usize);
+                    
+                    if self.ips.is_empty() {return self.next().await;}
                 }
                 Err(e) => {
                     tracing::warn!(?host, ?e, "lookup host for stun failed");