mirror of
https://github.com/netbirdio/netbird.git
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349 lines
12 KiB
Go
349 lines
12 KiB
Go
//go:build (linux && !android) || freebsd
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package dns
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import (
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"context"
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"encoding/binary"
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"errors"
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"fmt"
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"net/netip"
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"strings"
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"time"
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"github.com/godbus/dbus/v5"
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"github.com/hashicorp/go-version"
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"github.com/miekg/dns"
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log "github.com/sirupsen/logrus"
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"github.com/netbirdio/netbird/client/internal/statemanager"
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nbversion "github.com/netbirdio/netbird/version"
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)
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const (
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networkManagerDest = "org.freedesktop.NetworkManager"
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networkManagerDbusObjectNode = "/org/freedesktop/NetworkManager"
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networkManagerDbusDNSManagerInterface = "org.freedesktop.NetworkManager.DnsManager"
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networkManagerDbusDNSManagerObjectNode = networkManagerDbusObjectNode + "/DnsManager"
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networkManagerDbusDNSManagerModeProperty = networkManagerDbusDNSManagerInterface + ".Mode"
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networkManagerDbusDNSManagerRcManagerProperty = networkManagerDbusDNSManagerInterface + ".RcManager"
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networkManagerDbusVersionProperty = "org.freedesktop.NetworkManager.Version"
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networkManagerDbusGetDeviceByIPIfaceMethod = networkManagerDest + ".GetDeviceByIpIface"
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networkManagerDbusDeviceInterface = "org.freedesktop.NetworkManager.Device"
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networkManagerDbusDeviceGetAppliedConnectionMethod = networkManagerDbusDeviceInterface + ".GetAppliedConnection"
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networkManagerDbusDeviceReapplyMethod = networkManagerDbusDeviceInterface + ".Reapply"
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networkManagerDbusDeviceDeleteMethod = networkManagerDbusDeviceInterface + ".Delete"
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networkManagerDbusDefaultBehaviorFlag networkManagerConfigBehavior = 0
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networkManagerDbusIPv4Key = "ipv4"
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networkManagerDbusIPv6Key = "ipv6"
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networkManagerDbusDNSKey = "dns"
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networkManagerDbusDNSSearchKey = "dns-search"
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networkManagerDbusDNSPriorityKey = "dns-priority"
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// dns priority doc https://wiki.gnome.org/Projects/NetworkManager/DNS
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networkManagerDbusPrimaryDNSPriority int32 = -500
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networkManagerDbusWithMatchDomainPriority int32 = 0
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networkManagerDbusSearchDomainOnlyPriority int32 = 50
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)
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var supportedNetworkManagerVersionConstraints = []string{
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">= 1.16, < 1.27",
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">= 1.44, < 1.45",
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}
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type networkManagerDbusConfigurator struct {
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dbusLinkObject dbus.ObjectPath
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routingAll bool
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ifaceName string
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}
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// the types below are based on dbus specification, each field is mapped to a dbus type
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// see https://dbus.freedesktop.org/doc/dbus-specification.html#basic-types for more details on dbus types
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// see https://networkmanager.dev/docs/api/latest/gdbus-org.freedesktop.NetworkManager.Device.html on Network Manager input types
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// networkManagerConnSettings maps to a (a{sa{sv}}) dbus output from GetAppliedConnection and input for Reapply methods
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type networkManagerConnSettings map[string]map[string]dbus.Variant
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// networkManagerConfigVersion maps to a (t) dbus output from GetAppliedConnection and input for Reapply methods
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type networkManagerConfigVersion uint64
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// networkManagerConfigBehavior maps to a (u) dbus input for GetAppliedConnection and Reapply methods
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type networkManagerConfigBehavior uint32
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// cleanDeprecatedSettings cleans deprecated settings that still returned by
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// the GetAppliedConnection methods but can't be reApplied
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func (s networkManagerConnSettings) cleanDeprecatedSettings() {
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for _, key := range []string{"addresses", "routes"} {
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delete(s[networkManagerDbusIPv4Key], key)
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delete(s[networkManagerDbusIPv6Key], key)
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}
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}
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func newNetworkManagerDbusConfigurator(wgInterface string) (*networkManagerDbusConfigurator, error) {
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obj, closeConn, err := getDbusObject(networkManagerDest, networkManagerDbusObjectNode)
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if err != nil {
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return nil, fmt.Errorf("get nm dbus: %w", err)
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}
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defer closeConn()
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var s string
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err = obj.Call(networkManagerDbusGetDeviceByIPIfaceMethod, dbusDefaultFlag, wgInterface).Store(&s)
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if err != nil {
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return nil, fmt.Errorf("call: %w", err)
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}
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log.Debugf("got network manager dbus Link Object: %s from net interface %s", s, wgInterface)
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return &networkManagerDbusConfigurator{
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dbusLinkObject: dbus.ObjectPath(s),
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ifaceName: wgInterface,
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}, nil
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}
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func (n *networkManagerDbusConfigurator) supportCustomPort() bool {
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return false
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}
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func (n *networkManagerDbusConfigurator) applyDNSConfig(config HostDNSConfig, stateManager *statemanager.Manager) error {
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connSettings, configVersion, err := n.getAppliedConnectionSettings()
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if err != nil {
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return fmt.Errorf("retrieving the applied connection settings, error: %w", err)
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}
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connSettings.cleanDeprecatedSettings()
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dnsIP, err := netip.ParseAddr(config.ServerIP)
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if err != nil {
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return fmt.Errorf("unable to parse ip address, error: %w", err)
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}
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convDNSIP := binary.LittleEndian.Uint32(dnsIP.AsSlice())
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connSettings[networkManagerDbusIPv4Key][networkManagerDbusDNSKey] = dbus.MakeVariant([]uint32{convDNSIP})
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var (
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searchDomains []string
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matchDomains []string
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)
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for _, dConf := range config.Domains {
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if dConf.Disabled {
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continue
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}
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if dConf.MatchOnly {
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matchDomains = append(matchDomains, "~."+dns.Fqdn(dConf.Domain))
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continue
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}
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searchDomains = append(searchDomains, dns.Fqdn(dConf.Domain))
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}
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newDomainList := append(searchDomains, matchDomains...) //nolint:gocritic
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priority := networkManagerDbusSearchDomainOnlyPriority
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switch {
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case config.RouteAll:
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priority = networkManagerDbusPrimaryDNSPriority
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newDomainList = append(newDomainList, "~.")
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if !n.routingAll {
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log.Infof("configured %s:%d as main DNS forwarder for this peer", config.ServerIP, config.ServerPort)
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}
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case len(matchDomains) > 0:
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priority = networkManagerDbusWithMatchDomainPriority
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}
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if priority != networkManagerDbusPrimaryDNSPriority && n.routingAll {
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log.Infof("removing %s:%d as main DNS forwarder for this peer", config.ServerIP, config.ServerPort)
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n.routingAll = false
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}
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connSettings[networkManagerDbusIPv4Key][networkManagerDbusDNSPriorityKey] = dbus.MakeVariant(priority)
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connSettings[networkManagerDbusIPv4Key][networkManagerDbusDNSSearchKey] = dbus.MakeVariant(newDomainList)
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state := &ShutdownState{
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ManagerType: networkManager,
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WgIface: n.ifaceName,
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}
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if err := stateManager.UpdateState(state); err != nil {
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log.Errorf("failed to update shutdown state: %s", err)
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}
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log.Infof("adding %d search domains and %d match domains. Search list: %s , Match list: %s", len(searchDomains), len(matchDomains), searchDomains, matchDomains)
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err = n.reApplyConnectionSettings(connSettings, configVersion)
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if err != nil {
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return fmt.Errorf("reapplying the connection with new settings, error: %w", err)
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}
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return nil
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}
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func (n *networkManagerDbusConfigurator) restoreHostDNS() error {
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// once the interface is gone network manager cleans all config associated with it
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if err := n.deleteConnectionSettings(); err != nil {
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return fmt.Errorf("delete connection settings: %w", err)
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}
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return nil
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}
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func (n *networkManagerDbusConfigurator) getAppliedConnectionSettings() (networkManagerConnSettings, networkManagerConfigVersion, error) {
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obj, closeConn, err := getDbusObject(networkManagerDest, n.dbusLinkObject)
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if err != nil {
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return nil, 0, fmt.Errorf("attempting to retrieve the applied connection settings, err: %w", err)
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}
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defer closeConn()
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ctx, cancel := context.WithTimeout(context.TODO(), 5*time.Second)
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defer cancel()
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var (
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connSettings networkManagerConnSettings
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configVersion networkManagerConfigVersion
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)
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err = obj.CallWithContext(ctx, networkManagerDbusDeviceGetAppliedConnectionMethod, dbusDefaultFlag,
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networkManagerDbusDefaultBehaviorFlag).Store(&connSettings, &configVersion)
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if err != nil {
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return nil, 0, fmt.Errorf("calling GetAppliedConnection method with context, err: %w", err)
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}
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return connSettings, configVersion, nil
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}
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func (n *networkManagerDbusConfigurator) reApplyConnectionSettings(connSettings networkManagerConnSettings, configVersion networkManagerConfigVersion) error {
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obj, closeConn, err := getDbusObject(networkManagerDest, n.dbusLinkObject)
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if err != nil {
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return fmt.Errorf("attempting to retrieve the applied connection settings, err: %w", err)
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}
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defer closeConn()
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ctx, cancel := context.WithTimeout(context.TODO(), 5*time.Second)
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defer cancel()
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err = obj.CallWithContext(ctx, networkManagerDbusDeviceReapplyMethod, dbusDefaultFlag,
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connSettings, configVersion, networkManagerDbusDefaultBehaviorFlag).Store()
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if err != nil {
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return fmt.Errorf("calling ReApply method with context, err: %w", err)
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}
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return nil
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}
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func (n *networkManagerDbusConfigurator) deleteConnectionSettings() error {
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obj, closeConn, err := getDbusObject(networkManagerDest, n.dbusLinkObject)
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if err != nil {
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return fmt.Errorf("attempting to retrieve the applied connection settings, err: %w", err)
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}
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defer closeConn()
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ctx, cancel := context.WithTimeout(context.TODO(), 5*time.Second)
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defer cancel()
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// this call is required to remove the device for DNS cleanup, even if it fails
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err = obj.CallWithContext(ctx, networkManagerDbusDeviceDeleteMethod, dbusDefaultFlag).Store()
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if err != nil {
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var dbusErr dbus.Error
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if errors.As(err, &dbusErr) && dbusErr.Name == dbus.ErrMsgUnknownMethod.Name {
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// interface is gone already
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return nil
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}
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return fmt.Errorf("calling delete method with context, err: %s", err)
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}
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return nil
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}
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func (n *networkManagerDbusConfigurator) restoreUncleanShutdownDNS(*netip.Addr) error {
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if err := n.restoreHostDNS(); err != nil {
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return fmt.Errorf("restoring dns via network-manager: %w", err)
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}
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return nil
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}
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func isNetworkManagerSupported() bool {
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return isNetworkManagerSupportedVersion() && isNetworkManagerSupportedMode()
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}
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func isNetworkManagerSupportedMode() bool {
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var mode string
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err := getNetworkManagerDNSProperty(networkManagerDbusDNSManagerModeProperty, &mode)
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if err != nil {
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log.Error(err)
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return false
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}
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switch mode {
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case "dnsmasq", "unbound", "systemd-resolved":
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return true
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default:
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var rcManager string
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err = getNetworkManagerDNSProperty(networkManagerDbusDNSManagerRcManagerProperty, &rcManager)
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if err != nil {
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log.Error(err)
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return false
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}
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if rcManager == "unmanaged" {
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return false
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}
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}
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return true
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}
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func getNetworkManagerDNSProperty(property string, store any) error {
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obj, closeConn, err := getDbusObject(networkManagerDest, networkManagerDbusDNSManagerObjectNode)
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if err != nil {
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return fmt.Errorf("attempting to retrieve the network manager dns manager object, error: %w", err)
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}
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defer closeConn()
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v, e := obj.GetProperty(property)
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if e != nil {
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return fmt.Errorf("getting property %s: %w", property, e)
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}
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return v.Store(store)
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}
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func isNetworkManagerSupportedVersion() bool {
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obj, closeConn, err := getDbusObject(networkManagerDest, networkManagerDbusObjectNode)
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if err != nil {
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log.Errorf("got error while attempting to get the network manager object, err: %s", err)
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return false
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}
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defer closeConn()
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value, err := obj.GetProperty(networkManagerDbusVersionProperty)
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if err != nil {
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log.Errorf("unable to retrieve network manager mode, got error: %s", err)
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return false
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}
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versionValue, err := parseVersion(value.Value().(string))
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if err != nil {
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log.Errorf("nm: parse version: %s", err)
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return false
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}
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var supported bool
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for _, constraint := range supportedNetworkManagerVersionConstraints {
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constr, err := version.NewConstraint(constraint)
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if err != nil {
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log.Errorf("nm: create constraint: %s", err)
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return false
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}
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if met := constr.Check(versionValue); met {
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supported = true
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break
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}
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}
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log.Debugf("network manager constraints [%s] met: %t", strings.Join(supportedNetworkManagerVersionConstraints, " | "), supported)
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return supported
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}
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func parseVersion(inputVersion string) (*version.Version, error) {
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if inputVersion == "" || !nbversion.SemverRegexp.MatchString(inputVersion) {
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return nil, fmt.Errorf("couldn't parse the provided version: Not SemVer")
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}
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verObj, err := version.NewVersion(inputVersion)
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if err != nil {
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return nil, err
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}
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return verObj, nil
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}
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