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DNS DoH: Use EDNS0 with 100-300 padding by default (body padding)

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https://github.com/XTLS/Xray-core/pull/4516#issuecomment-2744093003
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RPRX 2025-03-21 20:13:09 +00:00 • committed by GitHub
parent b585b26f29
commit 607c2a6d31
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6 changed files with 51 additions and 39 deletions
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4
app/dns/nameserver_doh.go
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@ -219,7 +219,9 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, clientIP n
return
}
reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
// As we don't want our traffic pattern looks like DoH, we use Random-Length Padding instead of Block-Length Padding recommended in RFC 8467
// Although DoH server like 1.1.1.1 will pad the response to Block-Length 468, at least it is better than no padding for response at all
reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP, int(crypto.RandBetween(100, 300))))
var deadline time.Time
if d, ok := ctx.Deadline(); ok {