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tailcfg,all: change structs to []*dnstype.Resolver

Browse Source 
Signed-off-by: Maisem Ali <maisem@tailscale.com>
bradfitz/dot
Maisem Ali 3 years ago committed by Maisem Ali
parent 679415f3a8
commit fd99c54e10
14 changed files with 69 additions and 68 deletions
Show Stats Download Patch File Download Diff File

30
ipn/ipnlocal/dnsconfig_test.go
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@ -51,7 +51,7 @@ func TestDNSConfigForNetmap(t *testing.T) {
nm: &netmap.NetworkMap{},
prefs: &ipn.Prefs{},
want: &dns.Config{
Routes: map[dnsname.FQDN][]dnstype.Resolver{},
Routes: map[dnsname.FQDN][]*dnstype.Resolver{},
Hosts: map[dnsname.FQDN][]netaddr.IP{},
},
},
@ -77,7 +77,7 @@ func TestDNSConfigForNetmap(t *testing.T) {
},
prefs: &ipn.Prefs{},
want: &dns.Config{
Routes: map[dnsname.FQDN][]dnstype.Resolver{},
Routes: map[dnsname.FQDN][]*dnstype.Resolver{},
Hosts: map[dnsname.FQDN][]netaddr.IP{
"b.net.": ips("100.102.0.1", "100.102.0.2"),
"myname.net.": ips("100.101.101.101"),
@ -112,7 +112,7 @@ func TestDNSConfigForNetmap(t *testing.T) {
prefs: &ipn.Prefs{},
want: &dns.Config{
OnlyIPv6: true,
Routes: map[dnsname.FQDN][]dnstype.Resolver{},
Routes: map[dnsname.FQDN][]*dnstype.Resolver{},
Hosts: map[dnsname.FQDN][]netaddr.IP{
"b.net.": ips("fe75::2"),
"myname.net.": ips("fe75::1"),
@ -136,7 +136,7 @@ func TestDNSConfigForNetmap(t *testing.T) {
},
prefs: &ipn.Prefs{},
want: &dns.Config{
Routes: map[dnsname.FQDN][]dnstype.Resolver{},
Routes: map[dnsname.FQDN][]*dnstype.Resolver{},
Hosts: map[dnsname.FQDN][]netaddr.IP{
"myname.net.": ips("100.101.101.101"),
"foo.com.": ips("1.2.3.4"),
@ -158,7 +158,7 @@ func TestDNSConfigForNetmap(t *testing.T) {
},
want: &dns.Config{
Hosts: map[dnsname.FQDN][]netaddr.IP{},
Routes: map[dnsname.FQDN][]dnstype.Resolver{
Routes: map[dnsname.FQDN][]*dnstype.Resolver{
"0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa.": nil,
"100.100.in-addr.arpa.": nil,
"101.100.in-addr.arpa.": nil,
@ -242,13 +242,13 @@ func TestDNSConfigForNetmap(t *testing.T) {
os: "android",
nm: &netmap.NetworkMap{
DNS: tailcfg.DNSConfig{
Resolvers: []dnstype.Resolver{
Resolvers: []*dnstype.Resolver{
{Addr: "8.8.8.8"},
},
FallbackResolvers: []dnstype.Resolver{
FallbackResolvers: []*dnstype.Resolver{
{Addr: "8.8.4.4"},
},
Routes: map[string][]dnstype.Resolver{
Routes: map[string][]*dnstype.Resolver{
"foo.com.": {{Addr: "1.2.3.4"}},
},
},
@ -258,10 +258,10 @@ func TestDNSConfigForNetmap(t *testing.T) {
},
want: &dns.Config{
Hosts: map[dnsname.FQDN][]netaddr.IP{},
DefaultResolvers: []dnstype.Resolver{
DefaultResolvers: []*dnstype.Resolver{
{Addr: "8.8.8.8"},
},
Routes: map[dnsname.FQDN][]dnstype.Resolver{
Routes: map[dnsname.FQDN][]*dnstype.Resolver{
"foo.com.": {{Addr: "1.2.3.4"}},
},
},
@ -270,7 +270,7 @@ func TestDNSConfigForNetmap(t *testing.T) {
name: "exit_nodes_need_fallbacks",
nm: &netmap.NetworkMap{
DNS: tailcfg.DNSConfig{
FallbackResolvers: []dnstype.Resolver{
FallbackResolvers: []*dnstype.Resolver{
{Addr: "8.8.4.4"},
},
},
@ -281,8 +281,8 @@ func TestDNSConfigForNetmap(t *testing.T) {
},
want: &dns.Config{
Hosts: map[dnsname.FQDN][]netaddr.IP{},
Routes: map[dnsname.FQDN][]dnstype.Resolver{},
DefaultResolvers: []dnstype.Resolver{
Routes: map[dnsname.FQDN][]*dnstype.Resolver{},
DefaultResolvers: []*dnstype.Resolver{
{Addr: "8.8.4.4"},
},
},
@ -291,7 +291,7 @@ func TestDNSConfigForNetmap(t *testing.T) {
name: "not_exit_node_NOT_need_fallbacks",
nm: &netmap.NetworkMap{
DNS: tailcfg.DNSConfig{
FallbackResolvers: []dnstype.Resolver{
FallbackResolvers: []*dnstype.Resolver{
{Addr: "8.8.4.4"},
},
},
@ -301,7 +301,7 @@ func TestDNSConfigForNetmap(t *testing.T) {
},
want: &dns.Config{
Hosts: map[dnsname.FQDN][]netaddr.IP{},
Routes: map[dnsname.FQDN][]dnstype.Resolver{},
Routes: map[dnsname.FQDN][]*dnstype.Resolver{},
},
},
}

9
ipn/ipnlocal/local.go
Unescape Escape View File

@ -2112,7 +2112,7 @@ func (b *LocalBackend) authReconfig() {
// a runtime.GOOS.
func dnsConfigForNetmap(nm *netmap.NetworkMap, prefs *ipn.Prefs, logf logger.Logf, versionOS string) *dns.Config {
dcfg := &dns.Config{
Routes: map[dnsname.FQDN][]dnstype.Resolver{},
Routes: map[dnsname.FQDN][]*dnstype.Resolver{},
Hosts: map[dnsname.FQDN][]netaddr.IP{},
}
@ -2199,8 +2199,9 @@ func dnsConfigForNetmap(nm *netmap.NetworkMap, prefs *ipn.Prefs, logf logger.Log
}
}
addDefault := func(resolvers []dnstype.Resolver) {
addDefault := func(resolvers []*dnstype.Resolver) {
for _, r := range resolvers {
r := r
dcfg.DefaultResolvers = append(dcfg.DefaultResolvers, r)
}
}
@ -2208,7 +2209,7 @@ func dnsConfigForNetmap(nm *netmap.NetworkMap, prefs *ipn.Prefs, logf logger.Log
// If we're using an exit node and that exit node is new enough (1.19.x+)
// to run a DoH DNS proxy, then send all our DNS traffic through it.
if dohURL, ok := exitNodeCanProxyDNS(nm, prefs.ExitNodeID); ok {
addDefault([]dnstype.Resolver{{Addr: dohURL}})
addDefault([]*dnstype.Resolver{{Addr: dohURL}})
return dcfg
}
@ -2227,7 +2228,7 @@ func dnsConfigForNetmap(nm *netmap.NetworkMap, prefs *ipn.Prefs, logf logger.Log
//
// While we're already populating it, might as well size the
// slice appropriately.
dcfg.Routes[fqdn] = make([]dnstype.Resolver, 0, len(resolvers))
dcfg.Routes[fqdn] = make([]*dnstype.Resolver, 0, len(resolvers))
for _, r := range resolvers {
dcfg.Routes[fqdn] = append(dcfg.Routes[fqdn], r)

10
net/dns/config.go
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@ -22,14 +22,14 @@ type Config struct {
// which aren't covered by more specific per-domain routes below.
// If empty, the OS's default resolvers (the ones that predate
// Tailscale altering the configuration) are used.
DefaultResolvers []dnstype.Resolver
DefaultResolvers []*dnstype.Resolver
// Routes maps a DNS suffix to the resolvers that should be used
// for queries that fall within that suffix.
// If a query doesn't match any entry in Routes, the
// DefaultResolvers are used.
// A Routes entry with no resolvers means the route should be
// authoritatively answered using the contents of Hosts.
Routes map[dnsname.FQDN][]dnstype.Resolver
Routes map[dnsname.FQDN][]*dnstype.Resolver
// SearchDomains are DNS suffixes to try when expanding
// single-label queries.
SearchDomains []dnsname.FQDN
@ -98,9 +98,9 @@ func (c Config) hasDefaultResolvers() bool {
// singleResolverSet returns the resolvers used by c.Routes if all
// routes use the same resolvers, or nil if multiple sets of resolvers
// are specified.
func (c Config) singleResolverSet() []dnstype.Resolver {
func (c Config) singleResolverSet() []*dnstype.Resolver {
var (
prev []dnstype.Resolver
prev []*dnstype.Resolver
prevInitialized bool
)
for _, resolvers := range c.Routes {
@ -128,7 +128,7 @@ func (c Config) matchDomains() []dnsname.FQDN {
return ret
}
func sameResolverNames(a, b []dnstype.Resolver) bool {
func sameResolverNames(a, b []*dnstype.Resolver) bool {
if len(a) != len(b) {
return false
}

8
net/dns/manager.go
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@ -144,7 +144,7 @@ func (m *Manager) compileConfig(cfg Config) (rcfg resolver.Config, ocfg OSConfig
// authoritative suffixes, even if we don't propagate MagicDNS to
// the OS.
rcfg.Hosts = cfg.Hosts
routes := map[dnsname.FQDN][]dnstype.Resolver{} // assigned conditionally to rcfg.Routes below.
routes := map[dnsname.FQDN][]*dnstype.Resolver{} // assigned conditionally to rcfg.Routes below.
for suffix, resolvers := range cfg.Routes {
if len(resolvers) == 0 {
rcfg.LocalDomains = append(rcfg.LocalDomains, suffix)
@ -225,9 +225,9 @@ func (m *Manager) compileConfig(cfg Config) (rcfg resolver.Config, ocfg OSConfig
health.SetDNSOSHealth(err)
return resolver.Config{}, OSConfig{}, err
}
var defaultRoutes []dnstype.Resolver
var defaultRoutes []*dnstype.Resolver
for _, ip := range bcfg.Nameservers {
defaultRoutes = append(defaultRoutes, dnstype.Resolver{Addr: ip.String()})
defaultRoutes = append(defaultRoutes, &dnstype.Resolver{Addr: ip.String()})
}
rcfg.Routes["."] = defaultRoutes
ocfg.SearchDomains = append(ocfg.SearchDomains, bcfg.SearchDomains...)
@ -239,7 +239,7 @@ func (m *Manager) compileConfig(cfg Config) (rcfg resolver.Config, ocfg OSConfig
// toIPsOnly returns only the IP portion of dnstype.Resolver.
// Only safe to use if the resolvers slice has been cleared of
// DoH or custom-port entries with something like hasDefaultIPResolversOnly.
func toIPsOnly(resolvers []dnstype.Resolver) (ret []netaddr.IP) {
func toIPsOnly(resolvers []*dnstype.Resolver) (ret []netaddr.IP) {
for _, r := range resolvers {
if ipp, ok := r.IPPort(); ok && ipp.Port() == 53 {
ret = append(ret, ipp.IP())

14
net/dns/manager_test.go
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@ -437,9 +437,9 @@ func mustIPPs(strs ...string) (ret []netaddr.IPPort) {
return ret
}
func mustRes(strs ...string) (ret []dnstype.Resolver) {
func mustRes(strs ...string) (ret []*dnstype.Resolver) {
for _, s := range strs {
ret = append(ret, dnstype.Resolver{Addr: s})
ret = append(ret, &dnstype.Resolver{Addr: s})
}
return ret
}
@ -495,9 +495,9 @@ func hostsR(strs ...string) (ret map[dnsname.FQDN][]dnstype.Resolver) {
return ret
}
func upstreams(strs ...string) (ret map[dnsname.FQDN][]dnstype.Resolver) {
func upstreams(strs ...string) (ret map[dnsname.FQDN][]*dnstype.Resolver) {
var key dnsname.FQDN
ret = map[dnsname.FQDN][]dnstype.Resolver{}
ret = map[dnsname.FQDN][]*dnstype.Resolver{}
for _, s := range strs {
if s == "" {
if key == "" {
@ -508,14 +508,14 @@ func upstreams(strs ...string) (ret map[dnsname.FQDN][]dnstype.Resolver) {
if key == "" {
panic("IPPort provided before suffix")
}
ret[key] = append(ret[key], dnstype.Resolver{Addr: ipp.String()})
ret[key] = append(ret[key], &dnstype.Resolver{Addr: ipp.String()})
} else if _, err := netaddr.ParseIP(s); err == nil {
if key == "" {
panic("IPPort provided before suffix")
}
ret[key] = append(ret[key], dnstype.Resolver{Addr: s})
ret[key] = append(ret[key], &dnstype.Resolver{Addr: s})
} else if strings.HasPrefix(s, "http") {
ret[key] = append(ret[key], dnstype.Resolver{Addr: s})
ret[key] = append(ret[key], &dnstype.Resolver{Addr: s})
} else {
fqdn, err := dnsname.ToFQDN(s)
if err != nil {

8
net/dns/resolver/forwarder.go
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@ -170,7 +170,7 @@ type route struct {
// long to wait before querying it.
type resolverAndDelay struct {
// name is the upstream resolver.
name dnstype.Resolver
name *dnstype.Resolver
// startDelay is an amount to delay this resolver at
// start. It's used when, say, there are four Google or
@ -246,7 +246,7 @@ func (f *forwarder) Close() error {
// resolversWithDelays maps from a set of DNS server names to a slice of a type
// that included a startDelay, upgrading any well-known DoH (DNS-over-HTTP)
// servers in the process, insert a DoH lookup first before UDP fallbacks.
func resolversWithDelays(resolvers []dnstype.Resolver) []resolverAndDelay {
func resolversWithDelays(resolvers []*dnstype.Resolver) []resolverAndDelay {
rr := make([]resolverAndDelay, 0, len(resolvers)+2)
// Add the known DoH ones first, starting immediately.
@ -261,7 +261,7 @@ func resolversWithDelays(resolvers []dnstype.Resolver) []resolverAndDelay {
continue
}
didDoH[dohBase] = true
rr = append(rr, resolverAndDelay{name: dnstype.Resolver{Addr: dohBase}})
rr = append(rr, resolverAndDelay{name: &dnstype.Resolver{Addr: dohBase}})
}
type hostAndFam struct {
@ -300,7 +300,7 @@ func resolversWithDelays(resolvers []dnstype.Resolver) []resolverAndDelay {
// Resolver.SetConfig on reconfig.
//
// The memory referenced by routesBySuffix should not be modified.
func (f *forwarder) setRoutes(routesBySuffix map[dnsname.FQDN][]dnstype.Resolver) {
func (f *forwarder) setRoutes(routesBySuffix map[dnsname.FQDN][]*dnstype.Resolver) {
routes := make([]route, 0, len(routesBySuffix))
for suffix, rs := range routesBySuffix {
routes = append(routes, route{

8
net/dns/resolver/forwarder_test.go
Unescape Escape View File

@ -23,9 +23,9 @@ func (rr resolverAndDelay) String() string {
func TestResolversWithDelays(t *testing.T) {
// query
q := func(ss ...string) (ipps []dnstype.Resolver) {
q := func(ss ...string) (ipps []*dnstype.Resolver) {
for _, host := range ss {
ipps = append(ipps, dnstype.Resolver{Addr: host})
ipps = append(ipps, &dnstype.Resolver{Addr: host})
}
return
}
@ -42,7 +42,7 @@ func TestResolversWithDelays(t *testing.T) {
}
}
rr = append(rr, resolverAndDelay{
name: dnstype.Resolver{Addr: s},
name: &dnstype.Resolver{Addr: s},
startDelay: d,
})
}
@ -51,7 +51,7 @@ func TestResolversWithDelays(t *testing.T) {
tests := []struct {
name string
in []dnstype.Resolver
in []*dnstype.Resolver
want []resolverAndDelay
}{
{

10
net/dns/resolver/tsdns.go
Unescape Escape View File

@ -66,7 +66,7 @@ type Config struct {
// queries within that suffix.
// Queries only match the most specific suffix.
// To register a "default route", add an entry for ".".
Routes map[dnsname.FQDN][]dnstype.Resolver
Routes map[dnsname.FQDN][]*dnstype.Resolver
// LocalHosts is a map of FQDNs to corresponding IPs.
Hosts map[dnsname.FQDN][]netaddr.IP
// LocalDomains is a list of DNS name suffixes that should not be
@ -115,7 +115,7 @@ func WriteIPPorts(w *bufio.Writer, vv []netaddr.IPPort) {
}
// WriteDNSResolver writes r to w.
func WriteDNSResolver(w *bufio.Writer, r dnstype.Resolver) {
func WriteDNSResolver(w *bufio.Writer, r *dnstype.Resolver) {
io.WriteString(w, r.Addr)
if len(r.BootstrapResolution) > 0 {
w.WriteByte('(')
@ -129,7 +129,7 @@ func WriteDNSResolver(w *bufio.Writer, r dnstype.Resolver) {
}
// WriteDNSResolvers writes resolvers to w.
func WriteDNSResolvers(w *bufio.Writer, resolvers []dnstype.Resolver) {
func WriteDNSResolvers(w *bufio.Writer, resolvers []*dnstype.Resolver) {
w.WriteByte('[')
for i, r := range resolvers {
if i > 0 {
@ -142,7 +142,7 @@ func WriteDNSResolvers(w *bufio.Writer, resolvers []dnstype.Resolver) {
// WriteRoutes writes routes to w, omitting *.arpa routes and instead
// summarizing how many of them there were.
func WriteRoutes(w *bufio.Writer, routes map[dnsname.FQDN][]dnstype.Resolver) {
func WriteRoutes(w *bufio.Writer, routes map[dnsname.FQDN][]*dnstype.Resolver) {
var kk []dnsname.FQDN
arpa := 0
for k := range routes {
@ -347,7 +347,7 @@ func (r *Resolver) HandleExitNodeDNSQuery(ctx context.Context, q []byte, from ne
// will use its default ones from our DNS config.
} else {
resolvers = []resolverAndDelay{{
name: dnstype.Resolver{Addr: net.JoinHostPort(nameserver.String(), "53")},
name: &dnstype.Resolver{Addr: net.JoinHostPort(nameserver.String(), "53")},
}}
}

10
net/dns/resolver/tsdns_test.go
Unescape Escape View File

@ -480,10 +480,10 @@ func TestDelegate(t *testing.T) {
defer r.Close()
cfg := dnsCfg
cfg.Routes = map[dnsname.FQDN][]dnstype.Resolver{
cfg.Routes = map[dnsname.FQDN][]*dnstype.Resolver{
".": {
dnstype.Resolver{Addr: v4server.PacketConn.LocalAddr().String()},
dnstype.Resolver{Addr: v6server.PacketConn.LocalAddr().String()},
&dnstype.Resolver{Addr: v4server.PacketConn.LocalAddr().String()},
&dnstype.Resolver{Addr: v6server.PacketConn.LocalAddr().String()},
},
}
r.SetConfig(cfg)
@ -655,7 +655,7 @@ func TestDelegateSplitRoute(t *testing.T) {
defer r.Close()
cfg := dnsCfg
cfg.Routes = map[dnsname.FQDN][]dnstype.Resolver{
cfg.Routes = map[dnsname.FQDN][]*dnstype.Resolver{
".": {{Addr: server1.PacketConn.LocalAddr().String()}},
"other.": {{Addr: server2.PacketConn.LocalAddr().String()}},
}
@ -947,7 +947,7 @@ func BenchmarkFull(b *testing.B) {
defer r.Close()
cfg := dnsCfg
cfg.Routes = map[dnsname.FQDN][]dnstype.Resolver{
cfg.Routes = map[dnsname.FQDN][]*dnstype.Resolver{
".": {{Addr: server.PacketConn.LocalAddr().String()}},
}

6
tailcfg/tailcfg.go
Unescape Escape View File

@ -1003,7 +1003,7 @@ var FilterAllowAll = []FilterRule{
// DNSConfig is the DNS configuration.
type DNSConfig struct {
// Resolvers are the DNS resolvers to use, in order of preference.
Resolvers []dnstype.Resolver `json:",omitempty"`
Resolvers []*dnstype.Resolver `json:",omitempty"`
// Routes maps DNS name suffixes to a set of DNS resolvers to
// use. It is used to implement "split DNS" and other advanced DNS
@ -1015,13 +1015,13 @@ type DNSConfig struct {
// If the value is an empty slice, that means the suffix should still
// be handled by Tailscale's built-in resolver (100.100.100.100), such
// as for the purpose of handling ExtraRecords.
Routes map[string][]dnstype.Resolver `json:",omitempty"`
Routes map[string][]*dnstype.Resolver `json:",omitempty"`
// FallbackResolvers is like Resolvers, but is only used if a
// split DNS configuration is requested in a configuration that
// doesn't work yet without explicit default resolvers.
// https://github.com/tailscale/tailscale/issues/1743
FallbackResolvers []dnstype.Resolver `json:",omitempty"`
FallbackResolvers []*dnstype.Resolver `json:",omitempty"`
// Domains are the search domains to use.
// Search domains must be FQDNs, but *without* the trailing dot.
Domains []string `json:",omitempty"`

18
tailcfg/tailcfg_clone.go
Unescape Escape View File

@ -193,19 +193,19 @@ func (src *DNSConfig) Clone() *DNSConfig {
}
dst := new(DNSConfig)
*dst = *src
dst.Resolvers = make([]dnstype.Resolver, len(src.Resolvers))
dst.Resolvers = make([]*dnstype.Resolver, len(src.Resolvers))
for i := range dst.Resolvers {
dst.Resolvers[i] = *src.Resolvers[i].Clone()
dst.Resolvers[i] = src.Resolvers[i].Clone()
}
if dst.Routes != nil {
dst.Routes = map[string][]dnstype.Resolver{}
dst.Routes = map[string][]*dnstype.Resolver{}
for k := range src.Routes {
dst.Routes[k] = append([]dnstype.Resolver{}, src.Routes[k]...)
dst.Routes[k] = append([]*dnstype.Resolver{}, src.Routes[k]...)
}
}
dst.FallbackResolvers = make([]dnstype.Resolver, len(src.FallbackResolvers))
dst.FallbackResolvers = make([]*dnstype.Resolver, len(src.FallbackResolvers))
for i := range dst.FallbackResolvers {
dst.FallbackResolvers[i] = *src.FallbackResolvers[i].Clone()
dst.FallbackResolvers[i] = src.FallbackResolvers[i].Clone()
}
dst.Domains = append(src.Domains[:0:0], src.Domains...)
dst.Nameservers = append(src.Nameservers[:0:0], src.Nameservers...)
@ -217,9 +217,9 @@ func (src *DNSConfig) Clone() *DNSConfig {
// A compilation failure here means this code must be regenerated, with the command at the top of this file.
var _DNSConfigCloneNeedsRegeneration = DNSConfig(struct {
Resolvers []dnstype.Resolver
Routes map[string][]dnstype.Resolver
FallbackResolvers []dnstype.Resolver
Resolvers []*dnstype.Resolver
Routes map[string][]*dnstype.Resolver
FallbackResolvers []*dnstype.Resolver
Domains []string
Proxied bool
Nameservers []netaddr.IP

2
tstest/integration/vms/harness_test.go
Unescape Escape View File

@ -64,7 +64,7 @@ func newHarness(t *testing.T) *Harness {
// TODO: this is wrong.
// It is also only one of many configurations.
// Figure out how to scale it up.
Resolvers: []dnstype.Resolver{{Addr: "100.100.100.100"}, {Addr: "8.8.8.8"}},
Resolvers: []*dnstype.Resolver{{Addr: "100.100.100.100"}, {Addr: "8.8.8.8"}},
Domains: []string{"record"},
Proxied: true,
ExtraRecords: []tailcfg.DNSRecord{{Name: "extratest.record", Type: "A", Value: "1.2.3.4"}},

2
util/deephash/deephash_test.go
Unescape Escape View File

@ -192,7 +192,7 @@ func getVal() []any {
},
},
DNSConfig: &tailcfg.DNSConfig{
Resolvers: []dnstype.Resolver{
Resolvers: []*dnstype.Resolver{
{Addr: "10.0.0.1"},
},
},

2
wgengine/userspace.go
Unescape Escape View File

@ -1586,7 +1586,7 @@ func ipInPrefixes(ip netaddr.IP, pp []netaddr.IPPrefix) bool {
func dnsIPsOverTailscale(dnsCfg *dns.Config, routerCfg *router.Config) (ret []netaddr.IPPrefix) {
m := map[netaddr.IP]bool{}
add := func(resolvers []dnstype.Resolver) {
add := func(resolvers []*dnstype.Resolver) {
for _, r := range resolvers {
ip, err := netaddr.ParseIP(r.Addr)
if err != nil {

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