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@ -18,7 +18,7 @@ import (
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"github.com/godbus/dbus/v5"
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)
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type nmSettings map[string]map[string]dbus.Variant
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type nmConnectionSettings map[string]map[string]dbus.Variant
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// nmIsActive determines if NetworkManager is currently managing system DNS settings.
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func nmIsActive() bool {
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@ -56,23 +56,28 @@ func dnsNetworkManagerUp(config DNSConfig, interfaceName string) error {
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ctx, cancel := context.WithTimeout(context.Background(), dnsReconfigTimeout)
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defer cancel()
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// conn is a shared connection whose lifecycle is managed by the dbus package.
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// We should not interfere with that by closing it.
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conn, err := dbus.SystemBus()
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if err != nil {
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return fmt.Errorf("connecting to system bus: %w", err)
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}
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defer conn.Close()
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// This is how we get at the DNS settings:
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//
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// org.freedesktop.NetworkManager
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// ⇩
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// org.freedesktop.NetworkManager.Device
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// (describes a network interface)
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// ⇩
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// org.freedesktop.NetworkManager.Connection.Active
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// (active instance of a connection initialized from settings)
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// ⇩
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// org.freedesktop.NetworkManager.Connection
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// (connection settings)
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// |
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// [GetDeviceByIpIface]
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// |
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// v
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// org.freedesktop.NetworkManager.Device <--------\
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// (describes a network interface) |
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// | |
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// [GetAppliedConnection] [Reapply]
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// | |
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// v |
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// org.freedesktop.NetworkManager.Connection |
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// (connection settings) ------/
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// contains {dns, dns-priority, dns-search}
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//
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// Ref: https://developer.gnome.org/NetworkManager/stable/settings-ipv4.html.
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@ -88,49 +93,20 @@ func dnsNetworkManagerUp(config DNSConfig, interfaceName string) error {
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interfaceName,
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).Store(&devicePath)
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if err != nil {
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return fmt.Errorf("GetDeviceByIpIface: %w", err)
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return fmt.Errorf("getDeviceByIpIface: %w", err)
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}
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device := conn.Object("org.freedesktop.NetworkManager", devicePath)
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var activeConnPath dbus.ObjectPath
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var (
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settings nmConnectionSettings
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version uint64
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)
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err = device.CallWithContext(
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ctx, "org.freedesktop.DBus.Properties.Get", 0,
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"org.freedesktop.NetworkManager.Device", "ActiveConnection",
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).Store(&activeConnPath)
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if err != nil {
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return fmt.Errorf("getting ActiveConnection: %w", err)
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}
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activeConn := conn.Object("org.freedesktop.NetworkManager", activeConnPath)
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var connPath dbus.ObjectPath
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err = activeConn.CallWithContext(
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ctx, "org.freedesktop.DBus.Properties.Get", 0,
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"org.freedesktop.NetworkManager.Connection.Active", "Connection",
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).Store(&connPath)
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ctx, "org.freedesktop.NetworkManager.Device.GetAppliedConnection", 0,
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uint32(0),
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).Store(&settings, &version)
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if err != nil {
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return fmt.Errorf("getting Connection: %w", err)
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}
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connection := conn.Object("org.freedesktop.NetworkManager", connPath)
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// Note: strictly speaking, the following is not safe.
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//
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// It appears that the way to update connection settings
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// in NetworkManager is to get an entire connection settings object,
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// modify the fields we are interested in, then submit the modified object.
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//
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// This is unfortunate: if the network state changes in the meantime
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// (most relevantly to us, if routes change), we will overwrite those changes.
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//
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// That said, fortunately, this should have no real effect, as Tailscale routes
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// do not seem to show up in NetworkManager at all,
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// so they are presumably immune from being tampered with.
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var settings nmSettings
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err = connection.CallWithContext(
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ctx, "org.freedesktop.NetworkManager.Settings.Connection.GetSettings", 0,
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).Store(&settings)
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if err != nil {
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return fmt.Errorf("getting Settings: %w", err)
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return fmt.Errorf("getAppliedConnection: %w", err)
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}
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// Frustratingly, NetworkManager represents IPv4 addresses as uint32s,
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@ -152,10 +128,15 @@ func dnsNetworkManagerUp(config DNSConfig, interfaceName string) error {
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ipv4Map := settings["ipv4"]
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ipv4Map["dns"] = dbus.MakeVariant(dnsv4)
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ipv4Map["dns-search"] = dbus.MakeVariant(config.Domains)
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// dns-priority = -1 ensures that we have priority
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// over other interfaces, except those exploiting this same trick.
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// Ref: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1211110/comments/92.
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ipv4Map["dns-priority"] = dbus.MakeVariant(-1)
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// We should only request priority if we have nameservers to set.
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if len(dnsv4) == 0 {
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ipv4Map["dns-priority"] = dbus.MakeVariant(100)
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} else {
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// dns-priority = -1 ensures that we have priority
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// over other interfaces, except those exploiting this same trick.
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// Ref: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1211110/comments/92.
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ipv4Map["dns-priority"] = dbus.MakeVariant(-1)
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}
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// In principle, we should not need set this to true,
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// as our interface does not configure any automatic DNS settings (presumably via DHCP).
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// All the same, better to be safe.
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@ -175,7 +156,11 @@ func dnsNetworkManagerUp(config DNSConfig, interfaceName string) error {
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// Finally, set the actual DNS config.
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ipv6Map["dns"] = dbus.MakeVariant(dnsv6)
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ipv6Map["dns-search"] = dbus.MakeVariant(config.Domains)
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ipv6Map["dns-priority"] = dbus.MakeVariant(-1)
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if len(dnsv6) == 0 {
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ipv6Map["dns-priority"] = dbus.MakeVariant(100)
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} else {
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ipv6Map["dns-priority"] = dbus.MakeVariant(-1)
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}
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ipv6Map["ignore-auto-dns"] = dbus.MakeVariant(true)
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// deprecatedProperties are the properties in interface settings
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@ -193,11 +178,12 @@ func dnsNetworkManagerUp(config DNSConfig, interfaceName string) error {
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delete(ipv6Map, property)
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}
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err = connection.CallWithContext(
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ctx, "org.freedesktop.NetworkManager.Settings.Connection.UpdateUnsaved", 0, settings,
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err = device.CallWithContext(
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ctx, "org.freedesktop.NetworkManager.Device.Reapply", 0,
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settings, version, uint32(0),
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).Store()
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if err != nil {
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return fmt.Errorf("setting Settings: %w", err)
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return fmt.Errorf("reapply: %w", err)
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}
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return nil
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