all: fix panic if a nil HostsFiles and/or Zones is accessed

1 files changed, 3 insertions, 0 deletions

diff --git a/environment.go b/environment.go
index fad9c4e..b5c226c 100644
--- a/environment.go
+++ b/environment.go
@@ -116,6 +116,9 @@ func LoadEnvironment(dirBase, fileConfig string) (env *Environment, err error) {
 // newEnvironment create and initialize options with default values.
 func newEnvironment(dirBase, fileConfig string) *Environment {
 	return &Environment{
+		HostsFiles: make(map[string]*dns.HostsFile),
+		Zones:      make(map[string]*dns.Zone),
+
 		dirBase:        dirBase,
 		pathDirBlock:   filepath.Join(dirBase, dirBlock),
 		pathDirCaches:  filepath.Join(dirBase, dirCaches),