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All dnsdist servers exhibit the same behavior re: sending truncated responses

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A 128 bytes query will not get a 200 bytes response (randomly tested on
3.tlu.dl.delivery.mp.microsoft.com), not even a truncated one.

It may be related to fragments being blocked on the server socket, or a
different issue. We can expect everything to be back to normal in dnsdist
1.5.0 no matter what.
This commit is contained in:
Frank Denis 2020-03-26 15:19:17 +01:00
parent 5049516f53
commit b3fbc2304d
3 changed files with 6 additions and 7 deletions
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5
dnscrypt-proxy/config.go
View file

@ -139,7 +139,10 @@ func newConfig() Config {
"quad9-dnscrypt-ip4-filter-alt", "quad9-dnscrypt-ip4-filter-pri", "quad9-dnscrypt-ip4-nofilter-alt", "quad9-dnscrypt-ip4-nofilter-pri", "quad9-dnscrypt-ip6-filter-alt", "quad9-dnscrypt-ip6-filter-pri", "quad9-dnscrypt-ip6-nofilter-alt", "quad9-dnscrypt-ip6-nofilter-pri",
"cleanbrowsing-adult", "cleanbrowsing-family-ipv6", "cleanbrowsing-family", "cleanbrowsing-security",
},
LargerResponsesDropped: []string{"quad9-dnscrypt-ip4-filter-alt", "quad9-dnscrypt-ip4-filter-pri", "quad9-dnscrypt-ip4-nofilter-alt", "quad9-dnscrypt-ip4-nofilter-pri", "quad9-dnscrypt-ip6-filter-alt", "quad9-dnscrypt-ip6-filter-pri", "quad9-dnscrypt-ip6-nofilter-alt", "quad9-dnscrypt-ip6-nofilter-pri"},
LargerResponsesDropped: []string{
"quad9-dnscrypt-ip4-filter-alt", "quad9-dnscrypt-ip4-filter-pri", "quad9-dnscrypt-ip4-nofilter-alt", "quad9-dnscrypt-ip4-nofilter-pri", "quad9-dnscrypt-ip6-filter-alt", "quad9-dnscrypt-ip6-filter-pri", "quad9-dnscrypt-ip6-nofilter-alt", "quad9-dnscrypt-ip6-nofilter-pri",
"cleanbrowsing-adult", "cleanbrowsing-family-ipv6", "cleanbrowsing-family", "cleanbrowsing-security",
},
},
}
}

6
dnscrypt-proxy/crypto.go
View file

@ -89,11 +89,7 @@ func (proxy *Proxy) Encrypt(serverInfo *ServerInfo, packet []byte, proto string)
paddedLength := Min(MaxDNSUDPPacketSize, (Max(minQuestionSize, QueryOverhead)+1+63) & ^63)
if proto == "udp" {
if serverInfo.knownBugs.fragmentsBlocked {
if serverInfo.knownBugs.largerQueriesDropped {
paddedLength = MaxDNSUDPSafePacketSize
} else {
paddedLength = Min(MaxDNSUDPSafePacketSize, paddedLength)
}
paddedLength = MaxDNSUDPSafePacketSize
} else if serverInfo.knownBugs.largerQueriesDropped {
paddedLength = MaxDNSUDPPacketSize
}

2
dnscrypt-proxy/example-dnscrypt-proxy.toml
View file

@ -639,7 +639,7 @@ fragments_blocked = ['cisco', 'cisco-ipv6', 'cisco-familyshield', 'cisco-familys
# response is larger than the question.
# Do not change that list until the bugs are fixed server-side.
larger_responses_dropped = ['quad9-dnscrypt-ip4-filter-alt', 'quad9-dnscrypt-ip4-filter-pri', 'quad9-dnscrypt-ip4-nofilter-alt', 'quad9-dnscrypt-ip4-nofilter-pri', 'quad9-dnscrypt-ip6-filter-alt', 'quad9-dnscrypt-ip6-filter-pri', 'quad9-dnscrypt-ip6-nofilter-alt', 'quad9-dnscrypt-ip6-nofilter-pri']
larger_responses_dropped = ['quad9-dnscrypt-ip4-filter-alt', 'quad9-dnscrypt-ip4-filter-pri', 'quad9-dnscrypt-ip4-nofilter-alt', 'quad9-dnscrypt-ip4-nofilter-pri', 'quad9-dnscrypt-ip6-filter-alt', 'quad9-dnscrypt-ip6-filter-pri', 'quad9-dnscrypt-ip6-nofilter-alt', 'quad9-dnscrypt-ip6-nofilter-pri', 'cleanbrowsing-adult', 'cleanbrowsing-family-ipv6', 'cleanbrowsing-family', 'cleanbrowsing-security']