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filtering: imp answer field validation;

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This commit is contained in:
Maksim Kazantsev 2026-07-13 11:58:14 +03:00
parent 3adfbb9f3d
commit c6c19ae3d4
1 changed files with 9 additions and 0 deletions
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9
internal/filtering/rewrites.go
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@ -10,6 +10,7 @@ import (
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/logutil/slogutil"
"github.com/AdguardTeam/golibs/netutil"
"github.com/miekg/dns"
)
@ -93,6 +94,14 @@ func (rw *LegacyRewrite) normalize(ctx context.Context, l *slog.Logger) (err err
ip, err := netip.ParseAddr(rw.Answer)
if err != nil {
l.DebugContext(ctx, "normalizing legacy rewrite", slogutil.KeyError, err)
// Not an IP address, treat as CNAME target, but validate as a domain
// name first.
err = netutil.ValidateDomainName(rw.Answer)
if err != nil {
return fmt.Errorf("invalid CNAME target %q: %w", rw.Answer, err)
}
rw.Type = dns.TypeCNAME
return nil