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Properly parse dns resolver address (#622)

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Prevent panic when address is empty. Common with older managers, where
resolver is disabled by default as
we receive an empty dns config
This commit is contained in:
Maycon Santos 2022-12-13 12:26:48 +01:00 committed by GitHub
parent 93fcfeae91
commit 7dfef091bb
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 53 additions and 11 deletions
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5
client/internal/dns/network_manager_linux.go
View File

@ -95,7 +95,10 @@ func (n *networkManagerDbusConfigurator) applyDNSConfig(config hostDNSConfig) er
connSettings.cleanDeprecatedSettings()
dnsIP := netip.MustParseAddr(config.serverIP)
dnsIP, err := netip.ParseAddr(config.serverIP)
if err != nil {
return fmt.Errorf("unable to parse ip address, error: %s", err)
}
convDNSIP := binary.LittleEndian.Uint32(dnsIP.AsSlice())
connSettings[networkManagerDbusIPv4Key][networkManagerDbusDNSKey] = dbus.MakeVariant([]uint32{convDNSIP})
var (

49
client/internal/dns/server_test.go
View File

@ -5,6 +5,7 @@ import (
"fmt"
"github.com/miekg/dns"
nbdns "github.com/netbirdio/netbird/dns"
"github.com/netbirdio/netbird/iface"
"net"
"net/netip"
"os"
@ -185,13 +186,44 @@ func TestUpdateDNSServer(t *testing.T) {
expectedUpstreamMap: make(registrationMap),
expectedLocalMap: make(registrationMap),
},
{
name: "Disabled Service Should clean map",
initLocalMap: registrationMap{"netbird.cloud": struct{}{}},
initUpstreamMap: registrationMap{zoneRecords[0].Name: struct{}{}},
initSerial: 0,
inputSerial: 1,
inputUpdate: nbdns.Config{ServiceEnable: false},
expectedUpstreamMap: make(registrationMap),
expectedLocalMap: make(registrationMap),
},
}
for _, testCase := range testCases {
for n, testCase := range testCases {
t.Run(testCase.name, func(t *testing.T) {
dnsServer := getDefaultServerWithNoHostManager("127.0.0.1")
dnsServer.hostManager = newNoopHostMocker()
wgIface, err := iface.NewWGIFace(fmt.Sprintf("utun230%d", n), fmt.Sprintf("100.66.100.%d/32", n+1), iface.DefaultMTU)
if err != nil {
t.Fatal(err)
}
err = wgIface.Create()
if err != nil {
t.Fatal(err)
}
defer func() {
err = wgIface.Close()
if err != nil {
t.Log(err)
}
}()
dnsServer, err := NewDefaultServer(context.Background(), wgIface)
if err != nil {
t.Fatal(err)
}
defer func() {
err = dnsServer.hostManager.restoreHostDNS()
if err != nil {
t.Log(err)
}
}()
dnsServer.dnsMuxMap = testCase.initUpstreamMap
dnsServer.localResolver.registeredMap = testCase.initLocalMap
@ -199,7 +231,7 @@ func TestUpdateDNSServer(t *testing.T) {
// pretend we are running
dnsServer.listenerIsRunning = true
err := dnsServer.UpdateDNSServer(testCase.inputSerial, testCase.inputUpdate)
err = dnsServer.UpdateDNSServer(testCase.inputSerial, testCase.inputUpdate)
if err != nil {
if testCase.shouldFail {
return
@ -241,9 +273,12 @@ func TestDNSServerStartStop(t *testing.T) {
}
dnsServer.hostManager = newNoopHostMocker()
dnsServer.Start()
time.Sleep(100 * time.Millisecond)
if !dnsServer.listenerIsRunning {
t.Fatal("dns server listener is not running")
}
defer dnsServer.Stop()
err := dnsServer.localResolver.registerRecord(zoneRecords[0])
if err != nil {
t.Error(err)

10
client/internal/dns/systemd_linux.go
View File

@ -75,12 +75,16 @@ func newSystemdDbusConfigurator(wgInterface *iface.WGIface) (hostManager, error)
}
func (s *systemdDbusConfigurator) applyDNSConfig(config hostDNSConfig) error {
parsedIP := netip.MustParseAddr(config.serverIP).As4()
parsedIP, err := netip.ParseAddr(config.serverIP)
if err != nil {
return fmt.Errorf("unable to parse ip address, error: %s", err)
}
ipAs4 := parsedIP.As4()
defaultLinkInput := systemdDbusDNSInput{
Family: unix.AF_INET,
Address: parsedIP[:],
Address: ipAs4[:],
}
err := s.callLinkMethod(systemdDbusSetDNSMethodSuffix, []systemdDbusDNSInput{defaultLinkInput})
err = s.callLinkMethod(systemdDbusSetDNSMethodSuffix, []systemdDbusDNSInput{defaultLinkInput})
if err != nil {
return fmt.Errorf("setting the interface DNS server %s:%d failed with error: %s", config.serverIP, config.serverPort, err)
}