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resolv.go
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resolv.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package files
import (
"bytes"
"net/netip"
"os"
"github.com/siderolabs/talos/pkg/machinery/resources/network"
)
// ReadResolvConf reads and parses /etc/resolv.conf file.
func ReadResolvConf(path string) (network.ResolverSpecSpec, error) {
resolverSpec := network.ResolverSpecSpec{
ConfigLayer: network.ConfigPlatform,
}
resolvers, err := os.ReadFile(path)
if err != nil {
return resolverSpec, err
}
for _, line := range bytes.Split(resolvers, []byte("\n")) {
line = bytes.TrimSpace(line)
line, _, _ = bytes.Cut(line, []byte("#"))
if !bytes.HasPrefix(line, []byte("nameserver")) {
continue
}
line = bytes.TrimSpace(bytes.TrimPrefix(line, []byte("nameserver")))
if addr, err := netip.ParseAddr(string(line)); err == nil {
resolverSpec.DNSServers = append(resolverSpec.DNSServers, addr)
}
}
return resolverSpec, nil
}