init

internal/route/route_darwin.go

@@ -0,0 +1,59 @@
+//go:build darwin
+
+package route
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+// addRoute adds a route via a network interface (macOS route command).
+//   route add -inet -net <cidr> -interface <iface>
+func addRoute(cidr, iface string) error {
+	return runRoute("add", "-inet", "-net", cidr, "-interface", iface)
+}
+
+// deleteRoute removes a route via a network interface.
+func deleteRoute(cidr, iface string) error {
+	return runRoute("delete", "-inet", "-net", cidr, "-interface", iface)
+}
+
+// addRouteVia adds a route via a gateway IP.
+func addRouteVia(cidr, gateway string) error {
+	return runRoute("add", "-inet", "-net", cidr, gateway)
+}
+
+// deleteRouteVia removes a route via a gateway IP.
+func deleteRouteVia(cidr, gateway string) error {
+	return runRoute("delete", "-inet", "-net", cidr, gateway)
+}
+
+// defaultGateway returns the current default gateway IP.
+func defaultGateway() (string, error) {
+	out, err := exec.Command("route", "-n", "get", "default").Output()
+	if err != nil {
+		return "", err
+	}
+	for _, line := range strings.Split(string(out), "\n") {
+		line = strings.TrimSpace(line)
+		if strings.HasPrefix(line, "gateway:") {
+			parts := strings.SplitN(line, ":", 2)
+			if len(parts) == 2 {
+				gw := strings.TrimSpace(parts[1])
+				if gw != "" {
+					return gw, nil
+				}
+			}
+		}
+	}
+	return "", fmt.Errorf("no default gateway found")
+}
+
+func runRoute(args ...string) error {
+	cmd := exec.Command("route", args...)
+	if out, err := cmd.CombinedOutput(); err != nil {
+		return fmt.Errorf("route %s: %w (%s)", strings.Join(args, " "), err, strings.TrimSpace(string(out)))
+	}
+	return nil
+}