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localdns.go
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localdns.go
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package config
import (
"errors"
"fmt"
"net/netip"
"github.com/qdm12/dns/v2/pkg/nameserver"
"github.com/qdm12/gosettings"
"github.com/qdm12/gosettings/reader"
"github.com/qdm12/gotree"
)
type LocalDNS struct {
Enabled *bool
Resolvers []netip.AddrPort
}
var (
ErrLocalResolverAddressNotValid = errors.New("local resolver address is not valid")
ErrLocalResolverPortIsZero = errors.New("local resolver port is zero")
)
func (l *LocalDNS) setDefault() {
l.Enabled = gosettings.DefaultPointer(l.Enabled, true)
l.Resolvers = gosettings.DefaultSlice(l.Resolvers,
nameserver.GetDNSServers())
}
func (l *LocalDNS) validate() (err error) {
for _, resolver := range l.Resolvers {
switch {
case !resolver.IsValid():
return fmt.Errorf("%w: %s",
ErrLocalResolverAddressNotValid, resolver)
case resolver.Port() == 0:
return fmt.Errorf("%w: %s",
ErrLocalResolverPortIsZero, resolver)
}
}
return nil
}
func (l *LocalDNS) String() string {
return l.ToLinesNode().String()
}
func (l *LocalDNS) ToLinesNode() (node *gotree.Node) {
if !*l.Enabled {
return gotree.New("Local DNS middleware: disabled")
}
node = gotree.New("Local DNS middleware:")
resolversNode := gotree.New("Local resolvers:")
for _, resolver := range l.Resolvers {
resolversNode.Appendf("%s", resolver)
}
node.AppendNode(resolversNode)
return node
}
func (l *LocalDNS) read(reader *reader.Reader) (err error) {
l.Enabled, err = reader.BoolPtr("MIDDLEWARE_LOCALDNS_ENABLED")
if err != nil {
return err
}
l.Resolvers, err = reader.CSVNetipAddrPorts("MIDDLEWARE_LOCALDNS_RESOLVERS")
if err != nil {
return err
}
return nil
}