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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux && !android && !ts_omit_dbus
package dns
import (
"context"
"time"
"github.com/godbus/dbus/v5"
)
func init() {
optDBusPing.Set(dbusPing)
optDBusReadString.Set(dbusReadString)
}
func dbusPing(name, objectPath string) error {
conn, err := dbus.SystemBus()
if err != nil {
// DBus probably not running.
return err
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
obj := conn.Object(name, dbus.ObjectPath(objectPath))
call := obj.CallWithContext(ctx, "org.freedesktop.DBus.Peer.Ping", 0)
return call.Err
}
// dbusReadString reads a string property from the provided name and object
// path. property must be in "interface.member" notation.
func dbusReadString(name, objectPath, iface, member string) (string, error) {
conn, err := dbus.SystemBus()
if err != nil {
// DBus probably not running.
return "", err
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
obj := conn.Object(name, dbus.ObjectPath(objectPath))
var result dbus.Variant
err = obj.CallWithContext(ctx, "org.freedesktop.DBus.Properties.Get", 0, iface, member).Store(&result)
if err != nil {
return "", err
}
if s, ok := result.Value().(string); ok {
return s, nil
}
return result.String(), nil
}
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