net/dns: rename Config to OSConfig.

Making way for a new higher level config struct.

Signed-off-by: David Anderson <danderson@tailscale.com>

net/dns/config.go

@@ -8,9 +8,8 @@ import (
 	"inet.af/netaddr"
 )
 
-// Config is the set of parameters that uniquely determine
-// the state to which a manager should bring system DNS settings.
-type Config struct {
+// OSConfig is an OS DNS configuration.
+type OSConfig struct {
 	// Nameservers are the IP addresses of the nameservers to use.
 	Nameservers []netaddr.IP
 	// Domains are the search domains to use.
@@ -22,7 +21,7 @@ type Config struct {
 
 // Equal determines whether its argument and receiver
 // represent equivalent DNS configurations (then DNS reconfig is a no-op).
-func (lhs Config) Equal(rhs Config) bool {
+func (lhs OSConfig) Equal(rhs OSConfig) bool {
 	if lhs.Proxied != rhs.Proxied {
 		return false
 	}

net/dns/direct.go

@@ -48,8 +48,8 @@ func writeResolvConf(w io.Writer, servers []netaddr.IP, domains []string) {
 }
 
 // readResolvConf reads DNS configuration from /etc/resolv.conf.
-func readResolvConf() (Config, error) {
-	var config Config
+func readResolvConf() (OSConfig, error) {
+	var config OSConfig
 
 	f, err := os.Open("/etc/resolv.conf")
 	if err != nil {
@@ -115,7 +115,7 @@ func newDirectManager() managerImpl {
 }
 
 // Up implements managerImpl.
-func (m directManager) Up(config Config) error {
+func (m directManager) Up(config OSConfig) error {
 	// Write the tsConf file.
 	buf := new(bytes.Buffer)
 	writeResolvConf(buf, config.Nameservers, config.Domains)

net/dns/manager.go

@@ -25,7 +25,7 @@ const reconfigTimeout = time.Second
 
 type managerImpl interface {
 	// Up updates system DNS settings to match the given configuration.
-	Up(Config) error
+	Up(OSConfig) error
 	// Down undoes the effects of Up.
 	// It is idempotent and performs no action if Up has never been called.
 	Down() error
@@ -37,7 +37,7 @@ type Manager struct {
 
 	impl managerImpl
 
-	config Config
+	config OSConfig
 }
 
 // NewManagers created a new manager from the given config.
@@ -52,7 +52,7 @@ func NewManager(logf logger.Logf, interfaceName string) *Manager {
 	return m
 }
 
-func (m *Manager) Set(config Config) error {
+func (m *Manager) Set(config OSConfig) error {
 	if config.Equal(m.config) {
 		return nil
 	}

net/dns/manager_windows.go

@@ -64,7 +64,7 @@ func (m windowsManager) setDomains(basePath string, domains []string) error {
 	return setRegistryString(path, "SearchList", value)
 }
 
-func (m windowsManager) Up(config Config) error {
+func (m windowsManager) Up(config OSConfig) error {
 	var ipsv4 []string
 	var ipsv6 []string
 
@@ -114,5 +114,5 @@ func (m windowsManager) Up(config Config) error {
 }
 
 func (m windowsManager) Down() error {
-	return m.Up(Config{Nameservers: nil, Domains: nil})
+	return m.Up(OSConfig{Nameservers: nil, Domains: nil})
 }

net/dns/nm.go

@@ -62,7 +62,7 @@ func newNMManager(interfaceName string) managerImpl {
 type nmConnectionSettings map[string]map[string]dbus.Variant
 
 // Up implements managerImpl.
-func (m nmManager) Up(config Config) error {
+func (m nmManager) Up(config OSConfig) error {
 	ctx, cancel := context.WithTimeout(context.Background(), reconfigTimeout)
 	defer cancel()
 
@@ -201,5 +201,5 @@ func (m nmManager) Up(config Config) error {
 
 // Down implements managerImpl.
 func (m nmManager) Down() error {
-	return m.Up(Config{Nameservers: nil, Domains: nil})
+	return m.Up(OSConfig{Nameservers: nil, Domains: nil})
 }

net/dns/noop.go

@@ -9,7 +9,7 @@ package dns
 type noopManager struct{}
 
 // Up implements managerImpl.
-func (m noopManager) Up(Config) error { return nil }
+func (m noopManager) Up(OSConfig) error { return nil }
 
 // Down implements managerImpl.
 func (m noopManager) Down() error { return nil }

net/dns/resolvconf.go

@@ -116,7 +116,7 @@ func newResolvconfManager(logf logger.Logf) managerImpl {
 const resolvconfConfigName = "tun-tailscale.inet"
 
 // Up implements managerImpl.
-func (m resolvconfManager) Up(config Config) error {
+func (m resolvconfManager) Up(config OSConfig) error {
 	stdin := new(bytes.Buffer)
 	writeResolvConf(stdin, config.Nameservers, config.Domains) // dns_direct.go
 

net/dns/resolved.go

@@ -82,7 +82,7 @@ func newResolvedManager() managerImpl {
 }
 
 // Up implements managerImpl.
-func (m resolvedManager) Up(config Config) error {
+func (m resolvedManager) Up(config OSConfig) error {
 	ctx, cancel := context.WithTimeout(context.Background(), reconfigTimeout)
 	defer cancel()