Feature: OPENVPN_VERSION which can be 2.4 or 2.5

internal/provider/utils/cipher.go

@@ -1,10 +1,12 @@
 package utils
 
-import "strings"
+import (
+	"github.com/qdm12/gluetun/internal/constants"
+)
 
 func CipherLines(cipher, version string) (lines []string) {
-	switch {
-	case strings.HasPrefix(version, "2.4"):
+	switch version {
+	case constants.Openvpn24:
 		return []string{"cipher " + cipher}
 	default: // 2.5 and above
 		return []string{

internal/provider/utils/cipher_test.go

@@ -18,12 +18,12 @@ func Test_CipherLines(t *testing.T) {
 				"data-ciphers AES",
 			},
 		},
-		"2.4.5": {
-			version: "2.4.5",
+		"2.4": {
+			version: "2.4",
 			lines:   []string{"cipher AES"},
 		},
-		"2.5.3": {
-			version: "2.5.3",
+		"2.5": {
+			version: "2.5",
 			lines: []string{
 				"data-ciphers-fallback AES",
 				"data-ciphers AES",