From: Kees Monshouwer <mind04@monshouwer.org>
Date: Fri, 5 Feb 2021 20:29:48 +0000 (+0100)
Subject: auth: lmdb does not support multiple instances
X-Git-Tag: dnsdist-1.6.0-alpha2~27^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=refs%2Fpull%2F10013%2Fhead;p=thirdparty%2Fpdns.git

auth: lmdb does not support multiple instances
---

diff --git a/docs/backends/lmdb.rst b/docs/backends/lmdb.rst
index 0c454b595f..31638221f4 100644
--- a/docs/backends/lmdb.rst
+++ b/docs/backends/lmdb.rst
@@ -9,6 +9,7 @@ LMDB backend
 * DNSSEC: Yes
 * Disabled data: No
 * Comments: No
+* Multiple instances: No
 * Module name: lmdb
 * Launch name: ``lmdb``
 
diff --git a/modules/lmdbbackend/lmdbbackend.cc b/modules/lmdbbackend/lmdbbackend.cc
index 95b3976aee..48bb226e00 100644
--- a/modules/lmdbbackend/lmdbbackend.cc
+++ b/modules/lmdbbackend/lmdbbackend.cc
@@ -58,6 +58,11 @@ static std::mutex s_lmdbStartupLock;
 
 LMDBBackend::LMDBBackend(const std::string& suffix)
 {
+  // overlapping domain ids in combination with relative names are a recipe for disater
+  if (!suffix.empty()) {
+    throw std::runtime_error("LMDB backend does not suport multiple instances");
+  }
+
   setArgPrefix("lmdb"+suffix);
   
   string syncMode = toLower(getArg("sync-mode"));