BIND 10 trac744, updated. 38cddfdc23f6d2aa31be24173f9d7c1df2e3c4bc [trac744] Log info for data source
BIND 10 source code commits
bind10-changes at lists.isc.org
Fri Apr 29 14:59:48 UTC 2011
The branch, trac744 has been updated
via 38cddfdc23f6d2aa31be24173f9d7c1df2e3c4bc (commit)
via e2e13d0bd0856496a3571ba6b7f35f41e6534859 (commit)
from ea1f2d6e96715f0821df5d096be46b2454e6073a (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
commit 38cddfdc23f6d2aa31be24173f9d7c1df2e3c4bc
Author: Michal 'vorner' Vaner <michal.vaner at nic.cz>
Date: Fri Apr 29 16:59:24 2011 +0200
[trac744] Log info for data source
commit e2e13d0bd0856496a3571ba6b7f35f41e6534859
Author: Michal 'vorner' Vaner <michal.vaner at nic.cz>
Date: Fri Apr 29 14:29:31 2011 +0200
[trac744] Include messagedef.mes in distribution
-----------------------------------------------------------------------
Summary of changes:
src/lib/datasrc/Makefile.am | 2 +
src/lib/datasrc/data_source.cc | 92 +++++++++++++++++++++
src/lib/datasrc/messagedef.mes | 171 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 265 insertions(+), 0 deletions(-)
-----------------------------------------------------------------------
diff --git a/src/lib/datasrc/Makefile.am b/src/lib/datasrc/Makefile.am
index 5f81485..f893482 100644
--- a/src/lib/datasrc/Makefile.am
+++ b/src/lib/datasrc/Makefile.am
@@ -31,3 +31,5 @@ libdatasrc_la_LIBADD += $(top_builddir)/src/lib/cc/libcc.la
BUILT_SOURCES = messagedef.h messagedef.cc
messagedef.h messagedef.cc: Makefile messagedef.mes
$(top_builddir)/src/lib/log/compiler/message messagedef.mes
+
+EXTRA_DIST = messagedef.mes
diff --git a/src/lib/datasrc/data_source.cc b/src/lib/datasrc/data_source.cc
index db06db9..6189d97 100644
--- a/src/lib/datasrc/data_source.cc
+++ b/src/lib/datasrc/data_source.cc
@@ -219,6 +219,10 @@ chaseCname(Query& q, QueryTaskPtr task, RRsetPtr rrset) {
// Check the cache for data which can answer the current query task.
bool
checkCache(QueryTask& task, RRsetList& target) {
+ if (logger.isDebugEnabled(DBG_TRACE_DATA)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_CHECK_CACHE,
+ task.qname.toText().c_str(), task.qtype.toText().c_str());
+ }
HotCache& cache = task.q.getCache();
RRsetList rrsets;
RRsetPtr rrset;
@@ -231,6 +235,7 @@ checkCache(QueryTask& task, RRsetList& target) {
// ANY queries must be handled by the low-level data source,
// or the results won't be guaranteed to be complete
if (task.qtype == RRType::ANY() || task.qclass == RRClass::ANY()) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_NO_CACHE_ANY_SIMPLE);
break;
}
@@ -260,6 +265,7 @@ checkCache(QueryTask& task, RRsetList& target) {
case QueryTask::AUTH_QUERY: // Find exact RRset or CNAME
if (task.qtype == RRType::ANY() || task.qclass == RRClass::ANY()) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_NO_CACHE_ANY_AUTH);
break;
}
@@ -378,6 +384,10 @@ DataSrc::Result
doQueryTask(QueryTask& task, ZoneInfo& zoneinfo, RRsetList& target) {
HotCache& cache = task.q.getCache();
RRsetPtr rrset;
+ if (logger.isDebugEnabled(DBG_TRACE_DATA)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_DO_QUERY,
+ task.qname.toText().c_str(), task.qtype.toText().c_str());
+ }
// First off, make sure at least we have a matching zone in some data
// source. We must do this before checking the cache, because it can
@@ -388,11 +398,16 @@ doQueryTask(QueryTask& task, ZoneInfo& zoneinfo, RRsetList& target) {
const Name* const zonename = zoneinfo.getEnclosingZone();
if (ds == NULL) {
task.flags |= DataSrc::NO_SUCH_ZONE;
+ if (logger.isInfoEnabled()) {
+ logger.info(DATASRC_QUERY_NO_ZONE, task.qname.toText().c_str(),
+ task.qclass.toText().c_str());
+ }
return (DataSrc::SUCCESS);
}
// Then check the cache for matching data
if (checkCache(task, target)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_CACHED);
return (DataSrc::SUCCESS);
}
@@ -403,10 +418,12 @@ doQueryTask(QueryTask& task, ZoneInfo& zoneinfo, RRsetList& target) {
DataSrc::Result result;
switch (task.op) {
case QueryTask::SIMPLE_QUERY:
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_IS_SIMPLE);
result = ds->findExactRRset(task.qname, task.qclass, task.qtype,
target, task.flags, zonename);
if (result != DataSrc::SUCCESS) {
+ logger.error(DATASRC_QUERY_SIMPLE_FAIL, unsigned(result));
return (result);
}
@@ -428,10 +445,12 @@ doQueryTask(QueryTask& task, ZoneInfo& zoneinfo, RRsetList& target) {
return (result);
case QueryTask::AUTH_QUERY:
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_IS_AUTH);
result = ds->findRRset(task.qname, task.qclass, task.qtype,
target, task.flags, zonename);
if (result != DataSrc::SUCCESS) {
+ logger.error(DATASRC_QUERY_AUTH_FAIL, unsigned(result));
return (result);
}
@@ -464,10 +483,15 @@ doQueryTask(QueryTask& task, ZoneInfo& zoneinfo, RRsetList& target) {
case QueryTask::GLUE_QUERY:
case QueryTask::NOGLUE_QUERY:
+ logger.debug(DBG_TRACE_DATA, task.op == QueryTask::GLUE_QUERY ?
+ DATASRC_QUERY_IS_GLUE : DATASRC_QUERY_IS_NOGLUE);
result = ds->findAddrs(task.qname, task.qclass, target,
task.flags, zonename);
if (result != DataSrc::SUCCESS) {
+ logger.error(task.op == QueryTask::GLUE_QUERY ?
+ DATASRC_QUERY_GLUE_FAIL : DATASRC_QUERY_NOGLUE_FAIL,
+ unsigned(result));
return (result);
}
@@ -493,10 +517,12 @@ doQueryTask(QueryTask& task, ZoneInfo& zoneinfo, RRsetList& target) {
return (result);
case QueryTask::REF_QUERY:
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_IS_REF);
result = ds->findReferral(task.qname, task.qclass, target,
task.flags, zonename);
if (result != DataSrc::SUCCESS) {
+ logger.error(DATASRC_QUERY_REF_FAIL, unsigned(result));
return (result);
}
@@ -530,6 +556,7 @@ doQueryTask(QueryTask& task, ZoneInfo& zoneinfo, RRsetList& target) {
}
// Not reached
+ logger.error(DATASRC_QUERY_INVALID_OP);
return (DataSrc::ERROR);
}
@@ -541,6 +568,11 @@ inline void
addToMessage(Query& q, const Message::Section sect, RRsetPtr rrset,
bool no_dnssec = false)
{
+ if (logger.isDebugEnabled(DBG_TRACE_DATA)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_ADD_RRSET,
+ rrset->getName().toText().c_str(),
+ rrset->getType().toText().c_str());
+ }
Message& m = q.message();
if (no_dnssec) {
if (rrset->getType() == RRType::RRSIG() ||
@@ -559,6 +591,7 @@ addToMessage(Query& q, const Message::Section sect, RRsetPtr rrset,
// Copy referral information into the authority section of a message
inline void
copyAuth(Query& q, RRsetList& auth) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_COPY_AUTH);
BOOST_FOREACH(RRsetPtr rrset, auth) {
if (rrset->getType() == RRType::DNAME()) {
continue;
@@ -596,6 +629,11 @@ refQuery(const Query& q, const Name& name, ZoneInfo& zoneinfo,
// they'll be handled in a normal lookup in the zone.
inline bool
hasDelegation(Query& q, QueryTaskPtr task, ZoneInfo& zoneinfo) {
+ if (logger.isDebugEnabled(DBG_TRACE_DATA)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_DELEGATION,
+ task->qname.toText().c_str());
+ }
+
const Name* const zonename = zoneinfo.getEnclosingZone();
if (zonename == NULL) {
if (task->state == QueryTask::GETANSWER) {
@@ -661,6 +699,10 @@ addSOA(Query& q, ZoneInfo& zoneinfo) {
RRsetList soa;
const Name* const zonename = zoneinfo.getEnclosingZone();
+ if (logger.isDebugEnabled(DBG_TRACE_DATA)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_ADD_SOA,
+ zonename->toText().c_str());
+ }
QueryTask newtask(q, *zonename, RRType::SOA(), QueryTask::SIMPLE_QUERY);
RETERR(doQueryTask(newtask, zoneinfo, soa));
if (newtask.flags != 0) {
@@ -674,6 +716,10 @@ addSOA(Query& q, ZoneInfo& zoneinfo) {
inline DataSrc::Result
addNSEC(Query& q, const Name& name, ZoneInfo& zoneinfo) {
+ if (logger.isDebugEnabled(DBG_TRACE_DATA)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_ADD_NSEC,
+ name.toText().c_str());
+ }
RRsetList nsec;
QueryTask newtask(q, name, RRType::NSEC(), QueryTask::SIMPLE_QUERY);
@@ -690,9 +736,14 @@ inline DataSrc::Result
getNsec3(Query& q, ZoneInfo& zoneinfo, string& hash, RRsetPtr& target) {
const DataSrc* ds = zoneinfo.getDataSource();
const Name* const zonename = zoneinfo.getEnclosingZone();
+ if (logger.isDebugEnabled(DBG_TRACE_DATA)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_ADD_NSEC3,
+ zonename->toText().c_str());
+ }
if (ds == NULL) {
q.message().setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_NO_DS_NSEC3, zonename->toText().c_str());
return (DataSrc::ERROR);
}
@@ -795,6 +846,8 @@ proveNX(Query& q, QueryTaskPtr task, ZoneInfo& zoneinfo, const bool wildcard) {
const DataSrc* ds = zoneinfo.getDataSource();
if (ds == NULL) {
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_NO_DS_NSEC,
+ zonename->toText().c_str());
return (DataSrc::ERROR);
}
ds->findPreviousName(task->qname, nsecname, zonename);
@@ -823,6 +876,10 @@ proveNX(Query& q, QueryTaskPtr task, ZoneInfo& zoneinfo, const bool wildcard) {
// Attempt a wildcard lookup
inline DataSrc::Result
tryWildcard(Query& q, QueryTaskPtr task, ZoneInfo& zoneinfo, bool& found) {
+ if (logger.isDebugEnabled(DBG_TRACE_DATA)) {
+ logger.debug(DBG_TRACE_DATA, DATASRC_QUERY_WILDCARD,
+ task->qname.toText().c_str());
+ }
Message& m = q.message();
DataSrc::Result result;
found = false;
@@ -876,6 +933,9 @@ tryWildcard(Query& q, QueryTaskPtr task, ZoneInfo& zoneinfo, bool& found) {
result = proveNX(q, task, zoneinfo, true);
if (result != DataSrc::SUCCESS) {
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_WILDCARD_PROVENX_FAIL,
+ task->qname.toText().c_str(),
+ unsigned(result));
return (DataSrc::ERROR);
}
}
@@ -898,6 +958,9 @@ tryWildcard(Query& q, QueryTaskPtr task, ZoneInfo& zoneinfo, bool& found) {
RRsetList auth;
if (!refQuery(q, *zonename, zoneinfo, auth)) {
+ logger.error(DATASRC_QUERY_WILDCARD_REFERRAL,
+ task->qname.toText().c_str(),
+ unsigned(result));
return (DataSrc::ERROR);
}
@@ -913,6 +976,11 @@ tryWildcard(Query& q, QueryTaskPtr task, ZoneInfo& zoneinfo, bool& found) {
//
void
DataSrc::doQuery(Query& q) {
+ if (logger.isDebugEnabled(DBG_TRACE_BASIC)) {
+ logger.debug(DBG_TRACE_BASIC, DATASRC_QUERY_PROCESS,
+ q.qname().toText().c_str(), q.qtype().toText().c_str(),
+ q.qclass().toText().c_str());
+ }
Message& m = q.message();
vector<RRsetPtr> additional;
@@ -930,6 +998,9 @@ DataSrc::doQuery(Query& q) {
// Can't query directly for RRSIG.
if (task->qtype == RRType::RRSIG()) {
m.setRcode(Rcode::REFUSED());
+ if (logger.isWarnEnabled()) {
+ logger.warn(DATASRC_QUERY_RRSIG, task->qname.toText().c_str());
+ }
return;
}
@@ -937,6 +1008,7 @@ DataSrc::doQuery(Query& q) {
if (task->op == QueryTask::SIMPLE_QUERY ||
task->op == QueryTask::REF_QUERY) {
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_MISPLACED_TASK);
return;
}
@@ -956,6 +1028,7 @@ DataSrc::doQuery(Query& q) {
result = doQueryTask(*task, zoneinfo, data);
if (result != SUCCESS) {
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_TASK_FAIL, unsigned(result));
return;
}
@@ -965,6 +1038,7 @@ DataSrc::doQuery(Query& q) {
if (task->flags == NO_SUCH_ZONE) {
if (task->state == QueryTask::GETANSWER) {
m.setRcode(Rcode::REFUSED());
+ // No need to log it here, it was already logged in doQueryTask
return;
}
continue;
@@ -1006,6 +1080,8 @@ DataSrc::doQuery(Query& q) {
RRsetList auth;
if (!refQuery(q, Name(*zonename), zoneinfo, auth) ||
!findRRsetFromList(auth, RRType::NS())) {
+ logger.error(DATASRC_QUERY_MISSING_NS,
+ zonename->toText().c_str());
isc_throw(DataSourceError,
"NS RR not found in " << *zonename << "/" <<
q.qclass());
@@ -1030,10 +1106,12 @@ DataSrc::doQuery(Query& q) {
continue;
default:
+ logger.error(DATASRC_UNEXPECTED_QUERY_STATE);
isc_throw (Unexpected, "unexpected query state");
}
} else if (result == ERROR || result == NOT_IMPLEMENTED) {
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_FAIL);
return;
} else if ((task->flags & CNAME_FOUND) != 0) {
// The qname node contains a CNAME. Add a new task to the
@@ -1051,6 +1129,8 @@ DataSrc::doQuery(Query& q) {
m.setHeaderFlag(Message::HEADERFLAG_AA, false);
if (!refQuery(q, task->qname, zoneinfo, auth)) {
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_BAD_REFERRAL,
+ task->qname.toText().c_str());
return;
}
BOOST_FOREACH (RRsetPtr rrset, auth) {
@@ -1082,6 +1162,8 @@ DataSrc::doQuery(Query& q) {
result = tryWildcard(q, task, zoneinfo, wildcard_found);
if (result != SUCCESS) {
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_WILDCARD_FAIL,
+ task->qname.toText().c_str());
return;
}
@@ -1103,6 +1185,8 @@ DataSrc::doQuery(Query& q) {
result = addSOA(q, zoneinfo);
if (result != SUCCESS) {
+ logger.error(DATASRC_QUERY_MISSING_SOA,
+ zonename->toText().c_str());
isc_throw(DataSourceError,
"SOA RR not found in " << *zonename <<
"/" << q.qclass());
@@ -1119,6 +1203,8 @@ DataSrc::doQuery(Query& q) {
result = proveNX(q, task, zoneinfo, false);
if (result != DataSrc::SUCCESS) {
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_PROVENX_FAIL,
+ task->qname.toText().c_str());
return;
}
}
@@ -1127,6 +1213,7 @@ DataSrc::doQuery(Query& q) {
} else {
// Should never be reached!
m.setRcode(Rcode::SERVFAIL());
+ logger.error(DATASRC_QUERY_UNKNOWN_RESULT);
return;
}
}
@@ -1222,7 +1309,11 @@ DataSrc::findReferral(const Name& qname, const RRClass& qclass,
void
MetaDataSrc::addDataSrc(ConstDataSrcPtr data_src) {
+ logger.debug(DBG_TRACE_BASIC, DATASRC_META_ADD);
if (getClass() != RRClass::ANY() && data_src->getClass() != getClass()) {
+ logger.error(DATASRC_META_ADD_CLASS_MISMATCH,
+ data_src->getClass().toText().c_str(),
+ getClass().toText().c_str());
isc_throw(Unexpected, "class mismatch");
}
@@ -1231,6 +1322,7 @@ MetaDataSrc::addDataSrc(ConstDataSrcPtr data_src) {
void
MetaDataSrc::removeDataSrc(ConstDataSrcPtr data_src) {
+ logger.debug(DBG_TRACE_BASIC, DATASRC_META_REMOVE);
std::vector<ConstDataSrcPtr>::iterator it, itr;
for (it = data_sources.begin(); it != data_sources.end(); ++it) {
if (*it == data_src) {
diff --git a/src/lib/datasrc/messagedef.mes b/src/lib/datasrc/messagedef.mes
index 821f2e7..a6b5bee 100644
--- a/src/lib/datasrc/messagedef.mes
+++ b/src/lib/datasrc/messagedef.mes
@@ -102,3 +102,174 @@ QUERY_TOO_MANY_CNAMES CNAME chain limit exceeded at '%s'
+ are discouraged, and this might be a loop as well. Note that some of the
+ CNAMEs might have been synthesised from DNAMEs internally. This indicates
+ a problem with supplied data.
+
+QUERY_CHECK_CACHE Checking cache for '%s/%s'
++ Debug information. While processing a query we're looking into the hotspot
++ cache.
+
+QUERY_NO_CACHE_ANY_SIMPLE Ignoring cache for ANY query
++ Debug information. We don't really want to use cache for simple ANY query
++ (ANY as the type or class).
+
+QUERY_NO_CACHE_ANY_AUTH Ignoring cache for ANY query
++ Debug information. We don't really want to use cache for authoritative ANY
++ query (ANY as the type or class).
+
+DO_QUERY Handling query for '%s/%s'
++ Debug information. We're processing some internal query for given name and
++ type.
+
+QUERY_NO_ZONE No zone containing '%s' in class '%s'
++ We tried to get the domain but there's no zone in our data that encloses
++ the name. Maybe someone sent a query to wrong server for some reason.
+
+QUERY_CACHED Data found in cache
++ Debug information. We found the requested data in cache, so we're not
++ querying the real data source.
+
+QUERY_IS_SIMPLE Simple query
++ Debug information. The last DO_QUERY is a simple query.
+
+QUERY_IS_AUTH Auth query
++ Debug information. The last DO_QUERY is an auth query.
+
+QUERY_IS_GLUE Glue query
++ Debug information. The last DO_QUERY is query for glue addresses.
+
+QUERY_IS_NOGLUE Query for non-glue addresses
++ Debug information. The last DO_QUERY is query for addresses that are not
++ glue.
+
+QUERY_IS_REF Query for referral
++ Debug information. The last DO_QUERY is query for referral information.
+
+QUERY_SIMPLE_FAIL The underlying data source failed with %u
++ We queried the data source to answer a simple query and it returned error
++ (1 is some error, 2 is not implemented). The data source should have log
++ the specific error already.
+
+QUERY_AUTH_FAIL The underlying data source failed with %u
++ We queried the data source to answer authoritative query and it returned
++ error (1 is some error, 2 is not implemented). The data source should have
++ log the specific error already.
+
+QUERY_GLUE_FAIL The underlying data source failed with %u
++ We queried the data source to answer query for glue addresses and it returned
++ error (1 is some error, 2 is not implemented). The data source should have
++ log the specific error already.
+
+QUERY_NOGLUE_FAIL The underlying data source failed with %u
++ We queried the data source to answer query for non-glue addresses and it
++ returned error (1 is some error, 2 is not implemented). The data source
++ should have log the specific error already.
+
+QUERY_REF_FAIL The underlying data source failed with %u
++ We queried the data source to answer query for referral and it
++ returned error (1 is some error, 2 is not implemented). The data source
++ should have log the specific error already.
+
+QUERY_INVALID_OP Invalid query operation requested
++ This indicates a programmer error. The DO_QUERY was called with unknown
++ operation code.
+
+QUERY_ADD_RRSET Adding RRset '%s/%s' to message
++ Debug information. We're adding the rrset to answer message.
+
+QUERY_COPY_AUTH Copying authoritative section into message
++ Debug information. We're copying referral information into authoritative
++ section of the response message.
+
+QUERY_DELEGATION Looking for delegation on the path to '%s'
++ Debug information. We're looking if there's a delegation point on the way
++ down to the given domain.
+
+QUERY_ADD_SOA Adding SOA of '%s'
++ Debug information. We're adding a SOA record for the given zone into the
++ authority section.
+
+QUERY_ADD_NSEC Adding NSEC record for '%s'
++ Debug information. We're adding NSEC record for this domain.
+
+QUERY_ADD_NSEC3 Adding NSEC3 record of zone '%s'
++ Debug information. We're adding an NSEC3 record for this zone.
+
+QUERY_NO_DS_NSEC3 There's no DS record in the '%s' zone
++ We tried to insert a NSEC3 record into the message. But we didn't find a DS
++ record for this zone.
+
+QUERY_NO_DS_NSEC There's no DS record in the '%s' zone
++ We tried to insert a NSEC record into the message. But we didn't find a DS
++ record for this zone.
+
+QUERY_WILDCARD Looking for a wildcard covering '%s'
++ Debug information. We didn't find a direct match, so we're trying to find if
++ there's a wildcard we could use to answer the query.
+
+QUERY_WILDCARD_PROVENX_FAIL Unable to prove nonexistence of '%s' (%u)
++ While processing a wildcard, we tried to prove nonexistence of the given
++ domain or record. The code is 1 for error and 2 for not implemented.
+
+QUERY_WILDCARD_REFERRAL Unable to find referral info for '%s' (%u)
++ While processing a wildcard we met a referral. But we were not able to get
++ information for it. The code is 1 for error, 2 for not implemented.
+
+QUERY_PROCESS Processing query '%s/%s' in the '%s' class
++ Debug information. We're starting to process a user query.
+
+QUERY_RRSIG Unable to answer RRSIG query
++ The server is unable to answer a direct query for RRSIG type, but was asked
++ to do so.
+
+QUERY_MISPLACED_TASK Task of this type should not be here
++ This indicates a programming error. We found a task in the internal task
++ queue which wasn't supposed to ever be put into the queue, but handled
++ directly.
+
+QUERY_TASK_FAIL Task failed with %u
++ The query subtask failed. The reason should have been reported by the subtask
++ already. The code is 1 for error, 2 for not implemented.
+
+QUERY_MISSING_NS Missing NS records for '%s'
++ We wanted to put the nameserver records into the authority section, but we
++ discovered the zone doesn't have them. This indicates problem with provided
++ data.
+
+UNEXPECTED_QUERY_STATE Unexpected query state
++ This indicates a programming error. We generated an internal task of type
++ unknown to us.
+
+QUERY_FAIL Query failed
++ Some subtask of query processing failed. The reason should have been reported
++ already. We are returning SERVFAIL.
+
+QUERY_BAD_REFERRAL Bad referral to '%s'
++ We discovered that the domain lives in another zone. But we are not able to
++ generate referral information to it.
+
+QUERY_WILDCARD_FAIL Error processing wildcard for '%s'
++ We tried to find a wildcard to cover the domain, but there happened to be
++ some (hopefully already reported) error for it.
+
+QUERY_MISSING_SOA The zone '%s' has no SOA
++ We tried to answer negatively, but there's no SOA record in the zone.
+
+QUERY_PROVENX_FAIL Unable to prove nonexistence of '%s'
++ The user wants DNSSEC and we discovered the entity doesn't exist (either
++ domain or the record). But there was an error getting NSEC/NSEC3 record
++ to prove the nonexistence.
+
+QUERY_UNKNOWN_RESULT Unknown result of subtask
++ This indicates a programmer error. The answer of subtask doesn't look like
++ anything we would know.
+
+META_ADD Adding a data source into meta data source
++ Debug information. We add yet another data source into the meta data source
++ (probably at startup or reconfiguration).
+
+META_ADD_CLASS_MISMATCH Mismatch between classes '%s' and '%s'
++ We tried to add a data source of one class into a meta data source of a
++ different type. The types must be the same.
+
+META_REMOVE Removing data source from meta data source
++ Debug information. We take a data source out of meta data source (probably
++ at shutdown or reconfiguration).
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