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all: cleanup unused code, part 2 (#10670)

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And enable U1000 check in staticcheck.

Updates #cleanup

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
This commit is contained in:
Andrew Lytvynov
2023-12-21 19:40:03 -06:00
committed by GitHub
parent c9836b454d
commit 2716250ee8
52 changed files with 115 additions and 578 deletions
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55
net/dns/direct.go
View File

@@ -20,7 +20,6 @@ import (
"sync"
"time"
"tailscale.com/health"
"tailscale.com/net/dns/resolvconffile"
"tailscale.com/types/logger"
"tailscale.com/util/dnsname"
@@ -50,6 +49,8 @@ func readResolv(r io.Reader) (OSConfig, error) {
// resolvOwner returns the apparent owner of the resolv.conf
// configuration in bs - one of "resolvconf", "systemd-resolved" or
// "NetworkManager", or "" if no known owner was found.
//
//lint:ignore U1000 used in linux and freebsd code
func resolvOwner(bs []byte) string {
likely := ""
b := bytes.NewBuffer(bs)
@@ -130,11 +131,13 @@ type directManager struct {
ctx context.Context // valid until Close
ctxClose context.CancelFunc // closes ctx
mu sync.Mutex
wantResolvConf []byte // if non-nil, what we expect /etc/resolv.conf to contain
mu sync.Mutex
wantResolvConf []byte // if non-nil, what we expect /etc/resolv.conf to contain
//lint:ignore U1000 used in direct_linux.go
lastWarnContents []byte // last resolv.conf contents that we warned about
}
//lint:ignore U1000 used in manager_{freebsd,openbsd}.go
func newDirectManager(logf logger.Logf) *directManager {
return newDirectManagerOnFS(logf, directFS{})
}
@@ -288,52 +291,6 @@ func (m *directManager) setWant(want []byte) {
m.wantResolvConf = want
}
var warnTrample = health.NewWarnable()
// checkForFileTrample checks whether /etc/resolv.conf has been trampled
// by another program on the system. (e.g. a DHCP client)
func (m *directManager) checkForFileTrample() {
m.mu.Lock()
want := m.wantResolvConf
lastWarn := m.lastWarnContents
m.mu.Unlock()
if want == nil {
return
}
cur, err := m.fs.ReadFile(resolvConf)
if err != nil {
m.logf("trample: read error: %v", err)
return
}
if bytes.Equal(cur, want) {
warnTrample.Set(nil)
if lastWarn != nil {
m.mu.Lock()
m.lastWarnContents = nil
m.mu.Unlock()
m.logf("trample: resolv.conf again matches expected content")
}
return
}
if bytes.Equal(cur, lastWarn) {
// We already logged about this, so not worth doing it again.
return
}
m.mu.Lock()
m.lastWarnContents = cur
m.mu.Unlock()
show := cur
if len(show) > 1024 {
show = show[:1024]
}
m.logf("trample: resolv.conf changed from what we expected. did some other program interfere? current contents: %q", show)
warnTrample.Set(errors.New("Linux DNS config not ideal. /etc/resolv.conf overwritten. See https://tailscale.com/s/dns-fight"))
}
func (m *directManager) SetDNS(config OSConfig) (err error) {
defer func() {
if err != nil && errors.Is(err, fs.ErrPermission) && runtime.GOOS == "linux" &&

49
net/dns/direct_linux.go
View File

@@ -4,9 +4,12 @@
package dns
import (
"bytes"
"context"
"errors"
"github.com/illarion/gonotify"
"tailscale.com/health"
)
func (m *directManager) runFileWatcher() {
@@ -55,6 +58,52 @@ func (m *directManager) runFileWatcher() {
}
}
var warnTrample = health.NewWarnable()
// checkForFileTrample checks whether /etc/resolv.conf has been trampled
// by another program on the system. (e.g. a DHCP client)
func (m *directManager) checkForFileTrample() {
m.mu.Lock()
want := m.wantResolvConf
lastWarn := m.lastWarnContents
m.mu.Unlock()
if want == nil {
return
}
cur, err := m.fs.ReadFile(resolvConf)
if err != nil {
m.logf("trample: read error: %v", err)
return
}
if bytes.Equal(cur, want) {
warnTrample.Set(nil)
if lastWarn != nil {
m.mu.Lock()
m.lastWarnContents = nil
m.mu.Unlock()
m.logf("trample: resolv.conf again matches expected content")
}
return
}
if bytes.Equal(cur, lastWarn) {
// We already logged about this, so not worth doing it again.
return
}
m.mu.Lock()
m.lastWarnContents = cur
m.mu.Unlock()
show := cur
if len(show) > 1024 {
show = show[:1024]
}
m.logf("trample: resolv.conf changed from what we expected. did some other program interfere? current contents: %q", show)
warnTrample.Set(errors.New("Linux DNS config not ideal. /etc/resolv.conf overwritten. See https://tailscale.com/s/dns-fight"))
}
func (m *directManager) closeInotifyOnDone(ctx context.Context, in *gonotify.Inotify) {
<-ctx.Done()
in.Close()

12
net/dns/manager.go
View File

@@ -40,18 +40,6 @@ const maxActiveQueries = 256
// the lint exception is necessary and on others it is not,
// and plain ignore complains if the exception is unnecessary.
// reconfigTimeout is the time interval within which Manager.{Up,Down} should complete.
//
// This is particularly useful because certain conditions can cause indefinite hangs
// (such as improper dbus auth followed by contextless dbus.Object.Call).
// Such operations should be wrapped in a timeout context.
const reconfigTimeout = time.Second
type response struct {
pkt []byte
to netip.AddrPort // response destination (request source)
}
// Manager manages system DNS settings.
type Manager struct {
logf logger.Logf

13
net/dns/manager_linux.go
View File

@@ -69,13 +69,12 @@ func NewOSConfigurator(logf logger.Logf, interfaceName string) (ret OSConfigurat
// newOSConfigEnv are the funcs newOSConfigurator needs, pulled out for testing.
type newOSConfigEnv struct {
fs wholeFileFS
dbusPing func(string, string) error
dbusReadString func(string, string, string, string) (string, error)
nmIsUsingResolved func() error
nmVersionBetween func(v1, v2 string) (safe bool, err error)
resolvconfStyle func() string
isResolvconfDebianVersion func() bool
fs wholeFileFS
dbusPing func(string, string) error
dbusReadString func(string, string, string, string) (string, error)
nmIsUsingResolved func() error
nmVersionBetween func(v1, v2 string) (safe bool, err error)
resolvconfStyle func() string
}
func dnsMode(logf logger.Logf, env newOSConfigEnv) (ret string, err error) {

27
net/dns/manager_test.go
View File

@@ -636,13 +636,6 @@ func mustIPs(strs ...string) (ret []netip.Addr) {
return ret
}
func mustIPPs(strs ...string) (ret []netip.AddrPort) {
for _, s := range strs {
ret = append(ret, netip.MustParseAddrPort(s))
}
return ret
}
func mustRes(strs ...string) (ret []*dnstype.Resolver) {
for _, s := range strs {
ret = append(ret, &dnstype.Resolver{Addr: s})
@@ -681,26 +674,6 @@ func hosts(strs ...string) (ret map[dnsname.FQDN][]netip.Addr) {
return ret
}
func hostsR(strs ...string) (ret map[dnsname.FQDN][]dnstype.Resolver) {
var key dnsname.FQDN
ret = map[dnsname.FQDN][]dnstype.Resolver{}
for _, s := range strs {
if ip, err := netip.ParseAddr(s); err == nil {
if key == "" {
panic("IP provided before name")
}
ret[key] = append(ret[key], dnstype.Resolver{Addr: ip.String()})
} else {
fqdn, err := dnsname.ToFQDN(s)
if err != nil {
panic(err)
}
key = fqdn
}
}
return ret
}
func upstreams(strs ...string) (ret map[dnsname.FQDN][]*dnstype.Resolver) {
var key dnsname.FQDN
ret = map[dnsname.FQDN][]*dnstype.Resolver{}

7
net/dns/nm.go
View File

@@ -25,6 +25,13 @@ const (
lowerPriority = int32(200) // lower than all builtin auto priorities
)
// reconfigTimeout is the time interval within which Manager.{Up,Down} should complete.
//
// This is particularly useful because certain conditions can cause indefinite hangs
// (such as improper dbus auth followed by contextless dbus.Object.Call).
// Such operations should be wrapped in a timeout context.
const reconfigTimeout = time.Second
// nmManager uses the NetworkManager DBus API.
type nmManager struct {
interfaceName string

7
net/dns/recursive/recursive.go
View File

@@ -163,13 +163,6 @@ func (r *Resolver) logf(format string, args ...any) {
r.Logf(format, args...)
}
func (r *Resolver) dlogf(format string, args ...any) {
if r.Logf == nil || !debug() {
return
}
r.Logf(format, args...)
}
func (r *Resolver) depthlogf(depth int, format string, args ...any) {
if r.Logf == nil || !debug() {
return

23
net/dns/resolved.go
View File

@@ -7,7 +7,6 @@ package dns
import (
"context"
"errors"
"fmt"
"net"
"strings"
@@ -17,32 +16,10 @@ import (
"golang.org/x/sys/unix"
"tailscale.com/health"
"tailscale.com/logtail/backoff"
"tailscale.com/net/netaddr"
"tailscale.com/types/logger"
"tailscale.com/util/dnsname"
)
// resolvedListenAddr is the listen address of the resolved stub resolver.
//
// We only consider resolved to be the system resolver if the stub resolver is;
// that is, if this address is the sole nameserver in /etc/resolved.conf.
// In other cases, resolved may be managing the system DNS configuration directly.
// Then the nameserver list will be a concatenation of those for all
// the interfaces that register their interest in being a default resolver with
//
// SetLinkDomains([]{{"~.", true}, ...})
//
// which includes at least the interface with the default route, i.e. not us.
// This does not work for us: there is a possibility of getting NXDOMAIN
// from the other nameservers before we are asked or get a chance to respond.
// We consider this case as lacking resolved support and fall through to dnsDirect.
//
// While it may seem that we need to read a config option to get at this,
// this address is, in fact, hard-coded into resolved.
var resolvedListenAddr = netaddr.IPv4(127, 0, 0, 53)
var errNotReady = errors.New("interface not ready")
// DBus entities we talk to.
//
// DBus is an RPC bus. In particular, the bus we're talking to is the

9
net/dns/resolver/tsdns.go
View File

@@ -189,8 +189,6 @@ type Resolver struct {
// closed signals all goroutines to stop.
closed chan struct{}
// wg signals when all goroutines have stopped.
wg sync.WaitGroup
// mu guards the following fields from being updated while used.
mu sync.Mutex
@@ -609,6 +607,7 @@ func (r *Resolver) resolveLocal(domain dnsname.FQDN, typ dns.Type) (netip.Addr,
}
}
// Not authoritative, signal that forwarding is advisable.
metricDNSResolveLocalErrorRefused.Add(1)
return netip.Addr{}, dns.RCodeRefused
}
@@ -1248,6 +1247,7 @@ func (r *Resolver) respond(query []byte) ([]byte, error) {
resp := parser.response()
resp.Header.RCode = rcode
resp.IP = ip
metricDNSMagicDNSSuccessName.Add(1)
return marshalResponse(resp)
}
@@ -1305,9 +1305,8 @@ var (
metricDNSFwdErrorContext = clientmetric.NewCounter("dns_query_fwd_error_context")
metricDNSFwdErrorContextGotError = clientmetric.NewCounter("dns_query_fwd_error_context_got_error")
metricDNSFwdErrorType = clientmetric.NewCounter("dns_query_fwd_error_type")
metricDNSFwdErrorParseAddr = clientmetric.NewCounter("dns_query_fwd_error_parse_addr")
metricDNSFwdTruncated = clientmetric.NewCounter("dns_query_fwd_truncated")
metricDNSFwdErrorType = clientmetric.NewCounter("dns_query_fwd_error_type")
metricDNSFwdTruncated = clientmetric.NewCounter("dns_query_fwd_truncated")
metricDNSFwdUDP = clientmetric.NewCounter("dns_query_fwd_udp") // on entry
metricDNSFwdUDPWrote = clientmetric.NewCounter("dns_query_fwd_udp_wrote") // sent UDP packet

2
net/dns/resolver/tsdns_test.go
View File

@@ -37,8 +37,6 @@ var (
testipv4Arpa = dnsname.FQDN("4.3.2.1.in-addr.arpa.")
testipv6Arpa = dnsname.FQDN("f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa.")
magicDNSv4Port = netip.MustParseAddrPort("100.100.100.100:53")
)
var dnsCfg = Config{