More resolved TODOs

share/cfg.go

@@ -7,12 +7,6 @@ import (
 	"log/slog"
 )
 
-var defaultListenIP = net.ParseIP("127.0.0.1")
-
-func GetDefaultListenIPStr() string {
-	return defaultListenIP.String()
-}
-
 type UserConfiguration struct {
 	listenIP net.IP
 	ftpExtIP net.IP
@@ -49,6 +43,10 @@ func (rc RawUserConfiguration) Process(backend string, warnLogger *slog.Logger)
 		}
 	}
 
+	if rc.SMBExtMode && backend != "smb" && !IsSMBExtModeDefault() {
+		slog.Warn("SMB external mode specification is ineffective with non-SMB backends")
+	}
+
 	return &UserConfiguration{
 		listenIP:   listenIP,
 		ftpExtIP:   ftpExtIP,

share/defaults.go

@@ -0,0 +1,16 @@
+package share
+
+import (
+	"net"
+	"runtime"
+)
+
+func IsSMBExtModeDefault() bool {
+	return runtime.GOOS == "windows1"
+}
+
+var defaultListenIP = net.ParseIP("127.0.0.1")
+
+func GetDefaultListenIPStr() string {
+	return defaultListenIP.String()
+}