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Don't add backup nameservers in file

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This commit is contained in:
Viktor Liu 2025-06-12 17:52:33 +02:00
parent bdf2994e97
commit d3d4f8020d
1 changed files with 17 additions and 21 deletions
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32
client/internal/dns/file_unix.go
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@ -33,9 +33,9 @@ const (
type fileConfigurator struct {
repair *repair
originalPerms os.FileMode
nbNameserverIP string
originalNameservers []string
}
func newFileConfigurator() (*fileConfigurator, error) {
@ -76,6 +76,8 @@ func (f *fileConfigurator) applyDNSConfig(config HostDNSConfig, stateManager *st
log.Errorf("could not read original search domains from %s: %s", fileDefaultResolvConfBackupLocation, err)
}
f.originalNameservers = resolvConf.nameServers
f.repair.stopWatchFileChanges()
err = f.updateConfig(nbSearchDomains, f.nbNameserverIP, resolvConf, stateManager)
@ -86,14 +88,18 @@ func (f *fileConfigurator) applyDNSConfig(config HostDNSConfig, stateManager *st
return nil
}
// getOriginalNameservers returns the nameservers that were found in the original resolv.conf
func (f *fileConfigurator) getOriginalNameservers() []string {
return f.originalNameservers
}
func (f *fileConfigurator) updateConfig(nbSearchDomains []string, nbNameserverIP string, cfg *resolvConf, stateManager *statemanager.Manager) error {
searchDomainList := mergeSearchDomains(nbSearchDomains, cfg.searchDomains)
nameServers := generateNsList(nbNameserverIP, cfg)
options := prepareOptionsWithTimeout(cfg.others, int(dnsFailoverTimeout.Seconds()), dnsFailoverAttempts)
buf := prepareResolvConfContent(
searchDomainList,
nameServers,
[]string{nbNameserverIP},
options)
log.Debugf("creating managed file %s", defaultResolvConfPath)
@ -197,38 +203,28 @@ func restoreResolvConfFile() error {
return nil
}
// generateNsList generates a list of nameservers from the config and adds the primary nameserver to the beginning of the list
func generateNsList(nbNameserverIP string, cfg *resolvConf) []string {
ns := make([]string, 1, len(cfg.nameServers)+1)
ns[0] = nbNameserverIP
for _, cfgNs := range cfg.nameServers {
if nbNameserverIP != cfgNs {
ns = append(ns, cfgNs)
}
}
return ns
}
func prepareResolvConfContent(searchDomains, nameServers, others []string) bytes.Buffer {
var buf bytes.Buffer
buf.WriteString(fileGeneratedResolvConfContentHeaderNextLine)
for _, cfgLine := range others {
buf.WriteString(cfgLine)
buf.WriteString("\n")
buf.WriteByte('\n')
}
if len(searchDomains) > 0 {
buf.WriteString("search ")
buf.WriteString(strings.Join(searchDomains, " "))
buf.WriteString("\n")
buf.WriteByte('\n')
}
for _, ns := range nameServers {
buf.WriteString("nameserver ")
buf.WriteString(ns)
buf.WriteString("\n")
buf.WriteByte('\n')
}
return buf
}