mirror of
https://github.com/netbirdio/netbird.git
synced 2025-07-15 13:56:08 +02:00
4771fed64f
In the case of disabled stub listeren the list of name servers is unordered. The solution is to configure the resolv.conf file directly instead of dbus API. Because third-party services also can manipulate the DNS settings the agent watch the resolv.conf file and keep it up to date. - apply file type DNS manager if in the name server list does not exist the 127.0.0.53 address - watching the resolv.conf file with inotify service and overwrite all the time if the configuration has changed and it invalid - fix resolv.conf generation algorithm
87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
//go:build !android
|
|
|
|
package dns
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"os/exec"
|
|
|
|
log "github.com/sirupsen/logrus"
|
|
)
|
|
|
|
const resolvconfCommand = "resolvconf"
|
|
|
|
type resolvconf struct {
|
|
ifaceName string
|
|
|
|
originalSearchDomains []string
|
|
originalNameServers []string
|
|
othersConfigs []string
|
|
}
|
|
|
|
// supported "openresolv" only
|
|
func newResolvConfConfigurator(wgInterface WGIface) (hostManager, error) {
|
|
resolvConfEntries, err := parseDefaultResolvConf()
|
|
if err != nil {
|
|
log.Error(err)
|
|
}
|
|
|
|
return &resolvconf{
|
|
ifaceName: wgInterface.Name(),
|
|
originalSearchDomains: resolvConfEntries.searchDomains,
|
|
originalNameServers: resolvConfEntries.nameServers,
|
|
othersConfigs: resolvConfEntries.others,
|
|
}, nil
|
|
}
|
|
|
|
func (r *resolvconf) supportCustomPort() bool {
|
|
return false
|
|
}
|
|
|
|
func (r *resolvconf) applyDNSConfig(config HostDNSConfig) error {
|
|
var err error
|
|
if !config.RouteAll {
|
|
err = r.restoreHostDNS()
|
|
if err != nil {
|
|
log.Error(err)
|
|
}
|
|
return fmt.Errorf("unable to configure DNS for this peer using resolvconf manager without a nameserver group with all domains configured")
|
|
}
|
|
|
|
searchDomainList := searchDomains(config)
|
|
searchDomainList = mergeSearchDomains(searchDomainList, r.originalSearchDomains)
|
|
|
|
buf := prepareResolvConfContent(
|
|
searchDomainList,
|
|
append([]string{config.ServerIP}, r.originalNameServers...),
|
|
r.othersConfigs)
|
|
|
|
err = r.applyConfig(buf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
log.Infof("added %d search domains. Search list: %s", len(searchDomainList), searchDomainList)
|
|
return nil
|
|
}
|
|
|
|
func (r *resolvconf) restoreHostDNS() error {
|
|
cmd := exec.Command(resolvconfCommand, "-f", "-d", r.ifaceName)
|
|
_, err := cmd.Output()
|
|
if err != nil {
|
|
return fmt.Errorf("got an error while removing resolvconf configuration for %s interface, error: %s", r.ifaceName, err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (r *resolvconf) applyConfig(content bytes.Buffer) error {
|
|
cmd := exec.Command(resolvconfCommand, "-x", "-a", r.ifaceName)
|
|
cmd.Stdin = &content
|
|
_, err := cmd.Output()
|
|
if err != nil {
|
|
return fmt.Errorf("got an error while applying resolvconf configuration for %s interface, error: %s", r.ifaceName, err)
|
|
}
|
|
return nil
|
|
}
|