mirror of
https://github.com/netbirdio/netbird.git
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7ebe58f20a
* Add DNS list argument for mobile client * Write testable code Many places are checked the wgInterface != nil condition. It is doing it just because to avoid the real wgInterface creation for tests. Instead of this involve a wgInterface interface what is moc-able. * Refactor the DNS server internal code structure With the fake resolver has been involved several if-else statement and generated some unused variables to distinguish the listener and fake resolver solutions at running time. With this commit the fake resolver and listener based solution has been moved into two separated structure. Name of this layer is the 'service'. With this modification the unit test looks simpler and open the option to add new logic for the permanent DNS service usage for mobile systems. * Remove is running check in test We can not ensure the state well so remove this check. The test will fail if the server is not running well.
90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
//go:build !android
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package dns
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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log "github.com/sirupsen/logrus"
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)
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const (
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defaultResolvConfPath = "/etc/resolv.conf"
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)
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const (
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netbirdManager osManagerType = iota
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fileManager
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networkManager
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systemdManager
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resolvConfManager
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)
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type osManagerType int
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func newHostManager(wgInterface WGIface) (hostManager, error) {
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osManager, err := getOSDNSManagerType()
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if err != nil {
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return nil, err
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}
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log.Debugf("discovered mode is: %d", osManager)
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switch osManager {
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case networkManager:
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return newNetworkManagerDbusConfigurator(wgInterface)
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case systemdManager:
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return newSystemdDbusConfigurator(wgInterface)
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case resolvConfManager:
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return newResolvConfConfigurator(wgInterface)
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default:
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return newFileConfigurator()
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}
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}
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func getOSDNSManagerType() (osManagerType, error) {
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file, err := os.Open(defaultResolvConfPath)
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if err != nil {
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return 0, fmt.Errorf("unable to open %s for checking owner, got error: %s", defaultResolvConfPath, err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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text := scanner.Text()
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if len(text) == 0 {
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continue
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}
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if text[0] != '#' {
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return fileManager, nil
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}
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if strings.Contains(text, fileGeneratedResolvConfContentHeader) {
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return netbirdManager, nil
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}
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if strings.Contains(text, "NetworkManager") && isDbusListenerRunning(networkManagerDest, networkManagerDbusObjectNode) && isNetworkManagerSupported() {
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log.Debugf("is nm running on supported v? %t", isNetworkManagerSupportedVersion())
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return networkManager, nil
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}
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if strings.Contains(text, "systemd-resolved") && isDbusListenerRunning(systemdResolvedDest, systemdDbusObjectNode) {
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return systemdManager, nil
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}
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if strings.Contains(text, "resolvconf") {
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if isDbusListenerRunning(systemdResolvedDest, systemdDbusObjectNode) {
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var value string
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err = getSystemdDbusProperty(systemdDbusResolvConfModeProperty, &value)
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if err == nil {
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if value == systemdDbusResolvConfModeForeign {
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return systemdManager, nil
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}
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}
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log.Errorf("got an error while checking systemd resolv conf mode, error: %s", err)
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}
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return resolvConfManager, nil
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}
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}
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return fileManager, nil
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}
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