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Strip EDNS padding from upstream DNS responses

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This commit is contained in:
世界
2026-04-17 18:03:42 +08:00
parent 11ca030dd8
commit ee07334484
1 changed files with 13 additions and 0 deletions
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dns/client.go
+13
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@@ -536,11 +536,24 @@ func (c *Client) prepareExchangeMessage(message *dns.Msg, options adapter.DNSQue
return message return message
} }
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) exchangeToTransport(ctx context.Context, transport adapter.DNSTransport, message *dns.Msg) (*dns.Msg, error) { func (c *Client) exchangeToTransport(ctx context.Context, transport adapter.DNSTransport, message *dns.Msg) (*dns.Msg, error) {
ctx, cancel := context.WithTimeout(ctx, c.timeout) ctx, cancel := context.WithTimeout(ctx, c.timeout)
defer cancel() defer cancel()
response, err := transport.Exchange(ctx, message) response, err := transport.Exchange(ctx, message)
if err == nil { if err == nil {
stripDNSPadding(response)
return response, nil return response, nil
} }
var rcodeError RcodeError var rcodeError RcodeError