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db69a0cf9d
Most host managers doesn't support using custom DNS ports. We are now disabling setting it up to avoid unwanted results
91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
package dns
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import (
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"fmt"
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"os/exec"
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"strings"
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log "github.com/sirupsen/logrus"
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"github.com/netbirdio/netbird/iface"
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)
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const resolvconfCommand = "resolvconf"
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type resolvconf struct {
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ifaceName string
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}
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func newResolvConfConfigurator(wgInterface *iface.WGIface) (hostManager, error) {
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return &resolvconf{
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ifaceName: wgInterface.Name(),
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}, nil
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}
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func (r *resolvconf) supportCustomPort() bool {
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return false
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}
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func (r *resolvconf) applyDNSConfig(config hostDNSConfig) error {
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var err error
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if !config.routeAll {
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err = r.restoreHostDNS()
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if err != nil {
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log.Error(err)
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}
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return fmt.Errorf("unable to configure DNS for this peer using resolvconf manager without a nameserver group with all domains configured")
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}
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var searchDomains string
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appendedDomains := 0
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for _, dConf := range config.domains {
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if dConf.matchOnly || dConf.disabled {
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continue
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}
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if appendedDomains >= fileMaxNumberOfSearchDomains {
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// lets log all skipped domains
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log.Infof("already appended %d domains to search list. Skipping append of %s domain", fileMaxNumberOfSearchDomains, dConf.domain)
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continue
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}
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if fileSearchLineBeginCharCount+len(searchDomains) > fileMaxLineCharsLimit {
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// lets log all skipped domains
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log.Infof("search list line is larger than %d characters. Skipping append of %s domain", fileMaxLineCharsLimit, dConf.domain)
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continue
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}
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searchDomains += " " + dConf.domain
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appendedDomains++
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}
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content := fmt.Sprintf(fileGeneratedResolvConfContentFormat, fileDefaultResolvConfBackupLocation, config.serverIP, searchDomains)
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err = r.applyConfig(content)
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if err != nil {
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return err
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}
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log.Infof("added %d search domains. Search list: %s", appendedDomains, searchDomains)
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return nil
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}
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func (r *resolvconf) restoreHostDNS() error {
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cmd := exec.Command(resolvconfCommand, "-f", "-d", r.ifaceName)
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_, err := cmd.Output()
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if err != nil {
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return fmt.Errorf("got an error while removing resolvconf configuration for %s interface, error: %s", r.ifaceName, err)
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}
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return nil
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}
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func (r *resolvconf) applyConfig(content string) error {
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cmd := exec.Command(resolvconfCommand, "-x", "-a", r.ifaceName)
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cmd.Stdin = strings.NewReader(content)
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_, err := cmd.Output()
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if err != nil {
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return fmt.Errorf("got an error while appying resolvconf configuration for %s interface, error: %s", r.ifaceName, err)
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}
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return nil
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}
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