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//go:build !windows
package dns
import (
"errors"
"net"
"net/netip"
"github.com/miekg/dns"
log "github.com/sirupsen/logrus"
)
var errEmptyResolvConf = errors.New("no DNS servers configured in /etc/resolv.conf")
func getDNSHostAndPort() ([]string, error) {
conf, err := dns.ClientConfigFromFile("/etc/resolv.conf")
if err != nil {
return []string{}, err
}
var hosts = make([]string, len(conf.Servers))
for _, server := range conf.Servers {
dnsIP, err := netip.ParseAddr(server)
if err != nil {
log.Errorf("Failed to parse DNS IP address: %s", server)
continue
}
// add only ipv4 dns addresses
if dnsIP.Is4() {
hosts = append(hosts, net.JoinHostPort(server, conf.Port))
}
}
if len(hosts) == 0 {
return []string{}, errEmptyResolvConf
}
return hosts, nil
}
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