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Filter DNS fallback upstreams matching our server IP to prevent loops

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This commit is contained in:
Viktor Liu
2026-05-17 15:49:31 +02:00
parent 3f91f49277
commit 94a8b7325e
1 changed files with 13 additions and 7 deletions
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20
client/internal/dns/server.go
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@@ -772,13 +772,24 @@ func (s *DefaultServer) applyHostConfig() {
// context is released rather than leaked until GC.
func (s *DefaultServer) registerFallback() {
originalNameservers := s.hostManager.getOriginalNameservers()
if len(originalNameservers) == 0 {
serverIP := s.service.RuntimeIP()
var servers []netip.AddrPort
for _, ns := range originalNameservers {
if ns == serverIP {
log.Debugf("skipping original nameserver %s as it is the same as the server IP %s", ns, serverIP)
continue
}
servers = append(servers, netip.AddrPortFrom(ns, DefaultPort))
}
if len(servers) == 0 {
log.Debugf("no fallback upstreams to register; clearing PriorityFallback handler")
s.clearFallback()
return
}
log.Infof("registering original nameservers %v as upstream handlers with priority %d", originalNameservers, PriorityFallback)
log.Infof("registering original nameservers %v as upstream handlers with priority %d", servers, PriorityFallback)
handler, err := newUpstreamResolver(
s.ctx,
@@ -792,11 +803,6 @@ func (s *DefaultServer) registerFallback() {
return
}
handler.selectedRoutes = s.selectedRoutes
var servers []netip.AddrPort
for _, ns := range originalNameservers {
servers = append(servers, netip.AddrPortFrom(ns, DefaultPort))
}
handler.addRace(servers)
prev := s.fallbackHandler