From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Mon, 27 Mar 2023 11:41:36 +0000 (+0200)
Subject: dnsdist: Log when a TC=1 response is received for a DoH query
X-Git-Tag: rec-5.0.0-alpha1~19^2~33
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8330238fdaf135664dfd610970427f1662967f8;p=thirdparty%2Fpdns.git

dnsdist: Log when a TC=1 response is received for a DoH query
---

diff --git a/pdns/dnsdistdist/dnsdist-nghttp2-in.cc b/pdns/dnsdistdist/dnsdist-nghttp2-in.cc
index aefa50d777..8e225ee2ca 100644
--- a/pdns/dnsdistdist/dnsdist-nghttp2-in.cc
+++ b/pdns/dnsdistdist/dnsdist-nghttp2-in.cc
@@ -189,6 +189,7 @@ void IncomingHTTP2Connection::handleResponse(const struct timeval& now, TCPRespo
     dnsheader* responseDH = reinterpret_cast<struct dnsheader*>(response.d_buffer.data());
 
     if (responseDH->tc && state.d_packet && state.d_packet->size() > state.d_proxyProtocolPayloadSize && state.d_packet->size() - state.d_proxyProtocolPayloadSize > sizeof(dnsheader)) {
+      vinfolog("Response received from backend %s via UDP, for query %d received from %s via DoH, is truncated, retrying over TCP", response.d_ds->getNameWithAddr(), state.d_streamID, state.origRemote.toStringWithPort());
       auto& query = *state.d_packet;
       dnsheader* queryDH = reinterpret_cast<struct dnsheader*>(query.data() + state.d_proxyProtocolPayloadSize);
       /* restoring the original ID */