Warn when domain names are not in RFC1035 preferred syntax (#5414)

Warn when domain names are not in RFC1035 preferred syntax 

Signed-off-by: Md Sahil <Mohdssahil1@gmail.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/core/dnsserver/onstartup_test.go b/core/dnsserver/onstartup_test.go
new file mode 100644
index 000000000..031613cb8
--- /dev/null
+++ b/core/dnsserver/onstartup_test.go
@@ -0,0 +1,40 @@
+package dnsserver
+
+import (
+	"testing"
+)
+
+func TestRegex1035PrefSyntax(t *testing.T) {
+
+	testCases := []struct {
+		zone     string
+		expected bool
+	}{
+		{zone: ".", expected: true},
+		{zone: "example.com.", expected: true},
+		{zone: "example.", expected: true},
+		{zone: "example123.", expected: true},
+		{zone: "example123.com.", expected: true},
+		{zone: "abc-123.com.", expected: true},
+		{zone: "an-example.com.", expected: true},
+		{zone: "a.example.com.", expected: true},
+		{zone: "1.0.0.2.ip6.arpa.", expected: true},
+		{zone: "0.10.in-addr.arpa.", expected: true},
+		{zone: "example", expected: false},
+		{zone: "example:.", expected: false},
+		{zone: "-example.com.", expected: false},
+		{zone: ".example.com.", expected: false},
+		{zone: "1.example.com", expected: false},
+		{zone: "abc.123-xyz.", expected: false},
+		{zone: "example-?&^%$.com.", expected: false},
+		{zone: "abc-.example.com.", expected: false},
+		{zone: "abc-%$.example.com.", expected: false},
+		{zone: "123-abc.example.com.", expected: false},
+	}
+
+	for _, testCase := range testCases {
+		if checkZoneSyntax(testCase.zone) != testCase.expected {
+			t.Errorf("Expected %v for %q", testCase.expected, testCase.zone)
+		}
+	}
+}