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481465e1ae
Support DNS feature on mobile systems --------- Co-authored-by: Givi Khojanashvili <gigovich@gmail.com>
93 lines
2.3 KiB
Go
93 lines
2.3 KiB
Go
//go:build !android
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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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