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feat: Enhance resolveDefault to handle Stage 2 failures and fallback to Stage 3 A queries

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This commit is contained in:
dyoder
2026-03-17 13:14:39 -04:00
parent c341d70f73
commit c3a471553f
1 changed files with 11 additions and 3 deletions
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resolver/modes.go
+11 -3
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@@ -85,11 +85,19 @@ func resolveDefault(hostname string, pool []string, localResolvers []string, con
if authority != nil {
fmt.Fprintf(w, "[dns] Selected authority: %s → %s\n",
authority.Zone, strings.Join(authority.Nameservers, ", "))
return resolveAuthoritative(ctx, authority, hostname, pool, localResolvers, config, depth, w)
ips, err := resolveAuthoritative(ctx, authority, hostname, pool, localResolvers, config, depth, w)
if err == nil {
return ips, nil
}
// Stage 2 failed (e.g. sub-zone delegation referral not followed) —
// fall through to Stage 3 parallel A fallback.
fmt.Fprintf(w, "[dns] Stage 2 failed: %v\n", err)
fmt.Fprintf(w, "[dns] Falling back to Stage 3 parallel A queries\n")
} else {
fmt.Fprintf(w, "[dns] Stage 1: No NS records found at any level\n")
}
// Stage 3: No NS records found — fall back to parallel A queries.
fmt.Fprintf(w, "[dns] Stage 1: No NS records found at any level\n")
// Stage 3: Fall back to parallel recursive A queries.
ips, err := ParallelAFallback(ctx, w, pool, hostname, timeout)
if err != nil {
return nil, addPrivateTLDHint(hostname, err)