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Strip EDNS padding from upstream DNS responses

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世界
2026-07-27 10:42:45 +08:00
parent 513910462e
commit 51531186d0
1 changed files with 14 additions and 0 deletions
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14
dns/client.go
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@@ -106,6 +106,18 @@ func extractNegativeTTL(response *dns.Msg) (uint32, bool) {
return 0, false
}
func stripDNSPadding(response *dns.Msg) {
for _, record := range response.Extra {
opt, isOpt := record.(*dns.OPT)
if !isOpt {
continue
}
opt.Option = common.Filter(opt.Option, func(it dns.EDNS0) bool {
return it.Option() != dns.EDNS0PADDING
})
}
}
func (c *Client) Exchange(ctx context.Context, transport adapter.DNSTransport, message *dns.Msg, options adapter.DNSQueryOptions, responseChecker func(responseAddrs []netip.Addr) bool) (*dns.Msg, error) {
if len(message.Question) == 0 {
if c.logger != nil {
@@ -198,6 +210,8 @@ func (c *Client) Exchange(ctx context.Context, transport adapter.DNSTransport, m
} else {
return nil, err
}
} else {
stripDNSPadding(response)
}
/*if question.Qtype == dns.TypeA || question.Qtype == dns.TypeAAAA {
validResponse := response