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Handle EDNS version downgrade

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世界 2025-04-30 20:00:32 +08:00
parent 081dad8f57
commit 7608266ea7
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1 changed files with 11 additions and 1 deletions
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12
dns/client.go
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@ -232,10 +232,20 @@ func (c *Client) Exchange(ctx context.Context, transport adapter.DNSTransport, m
record.Header().Ttl = timeToLive record.Header().Ttl = timeToLive
} }
} }
response.Id = messageId
if !disableCache { if !disableCache {
c.storeCache(transport, question, response, timeToLive) c.storeCache(transport, question, response, timeToLive)
} }
response.Id = messageId
requestEDNSOpt := message.IsEdns0()
responseEDNSOpt := response.IsEdns0()
if responseEDNSOpt != nil && (requestEDNSOpt == nil || requestEDNSOpt.Version() < responseEDNSOpt.Version()) {
response.Extra = common.Filter(response.Extra, func(it dns.RR) bool {
return it.Header().Rrtype != dns.TypeOPT
})
if requestEDNSOpt != nil {
response.SetEdns0(responseEDNSOpt.UDPSize(), responseEDNSOpt.Do())
}
}
logExchangedResponse(c.logger, ctx, response, timeToLive) logExchangedResponse(c.logger, ctx, response, timeToLive)
return response, err return response, err
} }