mirror of
https://github.com/netbirdio/netbird.git
synced 2024-11-26 18:13:40 +01:00
88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
package dns
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import (
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"bufio"
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"fmt"
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"github.com/netbirdio/netbird/iface"
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log "github.com/sirupsen/logrus"
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"os"
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"strings"
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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 *iface.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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