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This commit is contained in:
Stanislav Chzhen 2024-08-21 19:08:30 +03:00
parent 72adfb101f
commit 03c69ab272
8 changed files with 94 additions and 71 deletions
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4
internal/dnsforward/config.go
View file

@ -159,7 +159,7 @@ type Config struct {
// IpsetList is the ipset configuration that allows AdGuard Home to add IP
// addresses of the specified domain names to an ipset list. Syntax:
//
// DOMAIN[,DOMAIN].../IPSET_NAME
// DOMAIN[,DOMAIN].../IPSET_NAME[,IPSET_NAME]...
//
// This field is ignored if [IpsetListFileName] is set.
IpsetList []string `yaml:"ipset"`
@ -470,7 +470,7 @@ func (s *Server) prepareIpsetListSettings() (ipsets []string, err error) {
}
ipsets = stringutil.SplitTrimmed(string(data), "\n")
ipsets = stringutil.FilterOut(ipsets, IsCommentOrEmpty)
slices.DeleteFunc(ipsets, IsCommentOrEmpty)
log.Debug("dns: using %d ipset rules from file %q", len(ipsets), fn)

10
internal/dnsforward/dnsforward.go
View file

@ -133,8 +133,9 @@ type Server struct {
// must be a valid domain name plus dots on each side.
localDomainSuffix string
// ipset processes DNS requests using ipset data.
ipset *ipsetCtx
// ipset processes DNS requests using ipset data. It must not be nil after
// initialization. See [newIpsetHandler].
ipset *ipsetHandler
// privateNets is the configured set of IP networks considered private.
privateNets netutil.SubnetSet
@ -609,12 +610,13 @@ func (s *Server) prepareLocalResolvers() (uc *proxy.UpstreamConfig, err error) {
// the primary DNS proxy instance. It assumes s.serverLock is locked or the
// Server not running.
func (s *Server) prepareInternalDNS() (err error) {
ipsetConf, err := s.prepareIpsetListSettings()
ipsetList, err := s.prepareIpsetListSettings()
if err != nil {
return fmt.Errorf("preparing ipset settings: %w", err)
}
s.ipset, err = newIPSetCtx(s.logger, ipsetConf)
ipsetLogger := s.logger.With(slogutil.KeyPrefix, "ipset")
s.ipset, err = newIpsetHandler(ipsetLogger, ipsetList)
if err != nil {
// Don't wrap the error, because it's informative enough as is.
return err

51
internal/dnsforward/ipset.go
View file

@ -1,6 +1,7 @@
package dnsforward
import (
"context"
"fmt"
"log/slog"
"net"
@ -13,21 +14,25 @@ import (
"github.com/miekg/dns"
)
// ipsetCtx is the ipset context. ipsetMgr can be nil.
type ipsetCtx struct {
// ipsetHandler is the ipset context. ipsetMgr can be nil.
type ipsetHandler struct {
ipsetMgr ipset.Manager
logger *slog.Logger
}
// newIPSetCtx returns a new initialized [ipsetCtx]. It is not safe for
// concurrent use.
func newIPSetCtx(logger *slog.Logger, ipsetConf []string) (c *ipsetCtx, err error) {
c = &ipsetCtx{
// newIpsetHandler returns a new initialized [ipsetHandler]. It is not safe for
// concurrent use. c is always non-nil for [Server.Close].
func newIpsetHandler(logger *slog.Logger, ipsetList []string) (c *ipsetHandler, err error) {
c = &ipsetHandler{
logger: logger,
}
ipsetLogger := logger.With(slogutil.KeyPrefix, "ipset")
c.ipsetMgr, err = ipset.NewManager(ipsetLogger, ipsetConf)
if errors.Is(err, os.ErrInvalid) || errors.Is(err, os.ErrPermission) {
c.ipsetMgr, err = ipset.NewManager(&ipset.Config{
Logger: logger,
IpsetList: ipsetList,
})
if errors.Is(err, os.ErrInvalid) ||
errors.Is(err, os.ErrPermission) ||
errors.Is(err, errors.ErrUnsupported) {
// ipset cannot currently be initialized if the server was installed
// from Snap or when the user or the binary doesn't have the required
// permissions, or when the kernel doesn't support netfilter.
@ -36,22 +41,18 @@ func newIPSetCtx(logger *slog.Logger, ipsetConf []string) (c *ipsetCtx, err erro
//
// TODO(a.garipov): The Snap problem can probably be solved if we add
// the netlink-connector interface plug.
logger.Warn("ipset: cannot initialize", slogutil.KeyError, err)
return c, nil
} else if errors.Is(err, errors.ErrUnsupported) {
logger.Warn("ipset: cannot initialize", slogutil.KeyError, err)
logger.Warn("cannot initialize", slogutil.KeyError, err)
return c, nil
} else if err != nil {
return nil, fmt.Errorf("initializing ipset: %w", err)
return c, fmt.Errorf("initializing ipset: %w", err)
}
return c, nil
}
// close closes the Linux Netfilter connections.
func (c *ipsetCtx) close() (err error) {
func (c *ipsetHandler) close() (err error) {
if c.ipsetMgr != nil {
return c.ipsetMgr.Close()
}
@ -59,7 +60,7 @@ func (c *ipsetCtx) close() (err error) {
return nil
}
func (c *ipsetCtx) dctxIsfilled(dctx *dnsContext) (ok bool) {
func (c *ipsetHandler) dctxIsfilled(dctx *dnsContext) (ok bool) {
return dctx != nil &&
dctx.responseFromUpstream &&
dctx.proxyCtx != nil &&
@ -70,7 +71,7 @@ func (c *ipsetCtx) dctxIsfilled(dctx *dnsContext) (ok bool) {
// skipIpsetProcessing returns true when the ipset processing can be skipped for
// this request.
func (c *ipsetCtx) skipIpsetProcessing(dctx *dnsContext) (ok bool) {
func (c *ipsetHandler) skipIpsetProcessing(dctx *dnsContext) (ok bool) {
if c == nil || c.ipsetMgr == nil || !c.dctxIsfilled(dctx) {
return true
}
@ -113,9 +114,11 @@ func ipsFromAnswer(ans []dns.RR) (ip4s, ip6s []net.IP) {
}
// process adds the resolved IP addresses to the domain's ipsets, if any.
func (c *ipsetCtx) process(dctx *dnsContext) (rc resultCode) {
c.logger.Debug("ipset: started processing")
defer c.logger.Debug("ipset: finished processing")
func (c *ipsetHandler) process(dctx *dnsContext) (rc resultCode) {
c.logger.Debug("started processing")
defer c.logger.Debug("finished processing")
ctx := context.TODO()
if c.skipIpsetProcessing(dctx) {
return resultCodeSuccess
@ -127,15 +130,15 @@ func (c *ipsetCtx) process(dctx *dnsContext) (rc resultCode) {
host = strings.ToLower(host)
ip4s, ip6s := ipsFromAnswer(dctx.proxyCtx.Res.Answer)
n, err := c.ipsetMgr.Add(host, ip4s, ip6s)
n, err := c.ipsetMgr.Add(ctx, host, ip4s, ip6s)
if err != nil {
// Consider ipset errors non-critical to the request.
c.logger.Error("ipset: adding host ips", slogutil.KeyError, err)
c.logger.ErrorContext(ctx, "adding host ips", slogutil.KeyError, err)
return resultCodeSuccess
}
c.logger.Debug("ipset: added new ipset entries", "num", n)
c.logger.DebugContext(ctx, "added new ipset entries", "num", n)
return resultCodeSuccess
}

11
internal/dnsforward/ipset_internal_test.go
View file

@ -1,6 +1,7 @@
package dnsforward
import (
"context"
"net"
"testing"
@ -17,7 +18,7 @@ type fakeIpsetMgr struct {
}
// Add implements the aghnet.IpsetManager interface for *fakeIpsetMgr.
func (m *fakeIpsetMgr) Add(host string, ip4s, ip6s []net.IP) (n int, err error) {
func (m *fakeIpsetMgr) Add(_ context.Context, host string, ip4s, ip6s []net.IP) (n int, err error) {
m.ip4s = append(m.ip4s, ip4s...)
m.ip6s = append(m.ip6s, ip6s...)
@ -59,7 +60,7 @@ func TestIpsetCtx_process(t *testing.T) {
responseFromUpstream: true,
}
ictx := &ipsetCtx{
ictx := &ipsetHandler{
logger: slogutil.NewDiscardLogger(),
}
rc := ictx.process(dctx)
@ -80,7 +81,7 @@ func TestIpsetCtx_process(t *testing.T) {
}
m := &fakeIpsetMgr{}
ictx := &ipsetCtx{
ictx := &ipsetHandler{
ipsetMgr: m,
logger: slogutil.NewDiscardLogger(),
}
@ -105,7 +106,7 @@ func TestIpsetCtx_process(t *testing.T) {
}
m := &fakeIpsetMgr{}
ictx := &ipsetCtx{
ictx := &ipsetHandler{
ipsetMgr: m,
logger: slogutil.NewDiscardLogger(),
}
@ -129,7 +130,7 @@ func TestIpsetCtx_SkipIpsetProcessing(t *testing.T) {
}
m := &fakeIpsetMgr{}
ictx := &ipsetCtx{
ictx := &ipsetHandler{
ipsetMgr: m,
logger: slogutil.NewDiscardLogger(),
}

34
internal/ipset/ipset.go
View file

@ -2,6 +2,7 @@
package ipset
import (
"context"
"log/slog"
"net"
)
@ -11,24 +12,33 @@ import (
// TODO(a.garipov): Perhaps generalize this into some kind of a NetFilter type,
// since ipset is exclusive to Linux?
type Manager interface {
Add(host string, ip4s, ip6s []net.IP) (n int, err error)
Add(ctx context.Context, host string, ip4s, ip6s []net.IP) (n int, err error)
Close() (err error)
}
// NewManager returns a new ipset manager. IPv4 addresses are added to an
// ipset with an ipv4 family; IPv6 addresses, to an ipv6 ipset. ipset must
// exist.
// Config is the configuration structure for the ipset manager.
type Config struct {
// Logger is used for logging the operation of the ipset manager. It must
// not be nil.
Logger *slog.Logger
// IpsetList is the ipset configuration with the following syntax:
//
// DOMAIN[,DOMAIN].../IPSET_NAME[,IPSET_NAME]...
//
// IpsetList must not contain any blank lines or comments.
IpsetList []string
}
// NewManager returns a new ipset manager. IPv4 addresses are added to an ipset
// with an ipv4 family; IPv6 addresses, to an ipv6 ipset. ipset must exist.
//
// The syntax of the ipsetConf is:
//
// DOMAIN[,DOMAIN].../IPSET_NAME[,IPSET_NAME]...
//
// If ipsetConf is empty, msg and err are nil. The error's chain contains
// If conf.IpsetList is empty, mgr and err are nil. The error's chain contains
// [errors.ErrUnsupported] if current OS is not supported.
func NewManager(logger *slog.Logger, ipsetConf []string) (mgr Manager, err error) {
if len(ipsetConf) == 0 {
func NewManager(conf *Config) (mgr Manager, err error) {
if len(conf.IpsetList) == 0 {
return nil, nil
}
return newManager(logger, ipsetConf)
return newManager(conf)
}

34
internal/ipset/ipset_linux.go
View file

@ -4,6 +4,7 @@ package ipset
import (
"bytes"
"context"
"fmt"
"log/slog"
"net"
@ -35,8 +36,8 @@ import (
// resolved IP addresses.
// newManager returns a new Linux ipset manager.
func newManager(logger *slog.Logger, ipsetConf []string) (set Manager, err error) {
return newManagerWithDialer(logger, ipsetConf, defaultDial)
func newManager(conf *Config) (set Manager, err error) {
return newManagerWithDialer(conf, defaultDial)
}
// defaultDial is the default netfilter dialing function.
@ -339,8 +340,8 @@ func (m *manager) ipsets(names []string, currentlyKnown map[string]props) (sets
}
if p.family != netfilter.ProtoIPv4 && p.family != netfilter.ProtoIPv6 {
m.logger.Debug("getting properties",
slogutil.KeyError, "unexpected ipset family",
m.logger.Debug(
"got unexpected ipset family while getting set properties",
"set_name", p.name,
"set_type", p.typeName,
"set_family", p.family,
@ -361,11 +362,7 @@ func (m *manager) ipsets(names []string, currentlyKnown map[string]props) (sets
// newManagerWithDialer returns a new Linux ipset manager using the provided
// dialer.
func newManagerWithDialer(
logger *slog.Logger,
ipsetConf []string,
dial dialer,
) (mgr Manager, err error) {
func newManagerWithDialer(conf *Config, dial dialer) (mgr Manager, err error) {
defer func() { err = errors.Annotate(err, "ipset: %w") }()
m := &manager{
@ -374,7 +371,7 @@ func newManagerWithDialer(
nameToIpset: make(map[string]props),
domainToIpsets: make(map[string][]props),
logger: logger,
logger: conf.Logger,
dial: dial,
@ -386,7 +383,7 @@ func newManagerWithDialer(
if errors.Is(err, unix.EPROTONOSUPPORT) {
// The implementation doesn't support this protocol version. Just
// issue a warning.
logger.Warn("dialing netfilter", slogutil.KeyError, err)
m.logger.Warn("dialing netfilter", slogutil.KeyError, err)
return nil, nil
}
@ -394,12 +391,12 @@ func newManagerWithDialer(
return nil, fmt.Errorf("dialing netfilter: %w", err)
}
err = m.parseIpsetConfig(ipsetConf)
err = m.parseIpsetConfig(conf.IpsetList)
if err != nil {
return nil, fmt.Errorf("getting ipsets: %w", err)
}
logger.Debug("initialized")
m.logger.Debug("initialized")
return m, nil
}
@ -486,6 +483,7 @@ func (m *manager) addIPs(host string, set props, ips []net.IP) (n int, err error
// addToSets adds the IP addresses to the corresponding ipset.
func (m *manager) addToSets(
ctx context.Context,
host string,
ip4s []net.IP,
ip6s []net.IP,
@ -508,7 +506,9 @@ func (m *manager) addToSets(
return n, fmt.Errorf("%q %q unexpected family %q", set.name, set.typeName, set.family)
}
m.logger.Debug("added ips to set",
m.logger.DebugContext(
ctx,
"added ips to set",
"ips_num", nn,
"set_name", set.name,
"set_type", set.typeName,
@ -521,7 +521,7 @@ func (m *manager) addToSets(
}
// Add implements the [Manager] interface for *manager.
func (m *manager) Add(host string, ip4s, ip6s []net.IP) (n int, err error) {
func (m *manager) Add(ctx context.Context, host string, ip4s, ip6s []net.IP) (n int, err error) {
m.mu.Lock()
defer m.mu.Unlock()
@ -530,9 +530,9 @@ func (m *manager) Add(host string, ip4s, ip6s []net.IP) (n int, err error) {
return 0, nil
}
m.logger.Debug("found sets", "set_num", len(sets))
m.logger.DebugContext(ctx, "found sets", "set_num", len(sets))
return m.addToSets(host, ip4s, ip6s, sets)
return m.addToSets(ctx, host, ip4s, ip6s, sets)
}
// Close implements the [Manager] interface for *manager.

17
internal/ipset/ipset_linux_internal_test.go
View file

@ -6,9 +6,11 @@ import (
"net"
"strings"
"testing"
"time"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/logutil/slogutil"
"github.com/AdguardTeam/golibs/testutil"
"github.com/digineo/go-ipset/v2"
"github.com/mdlayher/netlink"
"github.com/stretchr/testify/assert"
@ -16,6 +18,9 @@ import (
"github.com/ti-mo/netfilter"
)
// testTimeout is a common timeout for tests and contexts.
const testTimeout = 1 * time.Second
// fakeConn is a fake ipsetConn for tests.
type fakeConn struct {
ipv4Header *ipset.HeaderPolicy
@ -59,7 +64,7 @@ func (c *fakeConn) listAll() (sets []props, err error) {
}
func TestManager_Add(t *testing.T) {
ipsetConf := []string{
ipsetList := []string{
"example.com,example.net/ipv4set",
"example.org,example.biz/ipv6set",
}
@ -90,7 +95,11 @@ func TestManager_Add(t *testing.T) {
}, nil
}
m, err := newManagerWithDialer(slogutil.NewDiscardLogger(), ipsetConf, fakeDial)
conf := &Config{
Logger: slogutil.NewDiscardLogger(),
IpsetList: ipsetList,
}
m, err := newManagerWithDialer(conf, fakeDial)
require.NoError(t, err)
ip4 := net.IP{1, 2, 3, 4}
@ -101,7 +110,7 @@ func TestManager_Add(t *testing.T) {
0x00, 0x00, 0x56, 0x78,
}
n, err := m.Add("example.net", []net.IP{ip4}, nil)
n, err := m.Add(testutil.ContextWithTimeout(t, testTimeout), "example.net", []net.IP{ip4}, nil)
require.NoError(t, err)
assert.Equal(t, 1, n)
@ -111,7 +120,7 @@ func TestManager_Add(t *testing.T) {
gotIP4 := ipv4Entries[0].IP.Value
assert.Equal(t, ip4, gotIP4)
n, err = m.Add("example.biz", nil, []net.IP{ip6})
n, err = m.Add(testutil.ContextWithTimeout(t, testTimeout), "example.biz", nil, []net.IP{ip6})
require.NoError(t, err)
assert.Equal(t, 1, n)

4
internal/ipset/ipset_others.go
View file

@ -3,11 +3,9 @@
package ipset
import (
"log/slog"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
)
func newManager(_ *slog.Logger, _ []string) (mgr Manager, err error) {
func newManager(_ *Config) (mgr Manager, err error) {
return nil, aghos.Unsupported("ipset")
}