mirror of
https://github.com/netbirdio/netbird.git
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b64f5ffcb4
Small code cleaning in the iface package. These changes necessary to get a clean code in case if we involve more platforms. The OS related functions has been distributed into separate files and it has been mixed with not OS related logic. The goal is to get a clear picture of the layer between WireGuard and business logic.
86 lines
2.3 KiB
Go
86 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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"github.com/netbirdio/netbird/iface"
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log "github.com/sirupsen/logrus"
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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) 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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