cmd: allow import/running ctrld as library

cmd/cli/os_darwin.go

@@ -0,0 +1,59 @@
+package cli
+
+import (
+	"net"
+	"os/exec"
+
+	"github.com/Control-D-Inc/ctrld/internal/resolvconffile"
+)
+
+// allocate loopback ip
+// sudo ifconfig lo0 alias 127.0.0.2 up
+func allocateIP(ip string) error {
+	cmd := exec.Command("ifconfig", "lo0", "alias", ip, "up")
+	if err := cmd.Run(); err != nil {
+		mainLog.Load().Error().Err(err).Msg("allocateIP failed")
+		return err
+	}
+	return nil
+}
+
+func deAllocateIP(ip string) error {
+	cmd := exec.Command("ifconfig", "lo0", "-alias", ip)
+	if err := cmd.Run(); err != nil {
+		mainLog.Load().Error().Err(err).Msg("deAllocateIP failed")
+		return err
+	}
+	return nil
+}
+
+// set the dns server for the provided network interface
+// networksetup -setdnsservers Wi-Fi 8.8.8.8 1.1.1.1
+// TODO(cuonglm): use system API
+func setDNS(iface *net.Interface, nameservers []string) error {
+	cmd := "networksetup"
+	args := []string{"-setdnsservers", iface.Name}
+	args = append(args, nameservers...)
+
+	if err := exec.Command(cmd, args...).Run(); err != nil {
+		mainLog.Load().Error().Err(err).Msgf("setDNS failed, ips = %q", nameservers)
+		return err
+	}
+	return nil
+}
+
+// TODO(cuonglm): use system API
+func resetDNS(iface *net.Interface) error {
+	cmd := "networksetup"
+	args := []string{"-setdnsservers", iface.Name, "empty"}
+
+	if err := exec.Command(cmd, args...).Run(); err != nil {
+		mainLog.Load().Error().Err(err).Msgf("resetDNS failed")
+		return err
+	}
+	return nil
+}
+
+func currentDNS(_ *net.Interface) []string {
+	return resolvconffile.NameServers("")
+}