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Code Issues Releases Wiki Activity

Feature: Fake DNS support (#406)

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* Add fake dns

A new config object "fake" in DnsObject for toggling fake dns function

Compare with sniffing, fake dns is not limited to http and tls traffic.
It works across all inbounds. For example, when dns request come
from one inbound, the local DNS server of v2ray will response with a
unique fake IP for every unique domain name. Then later on v2ray
received a request to one of the fake IP from any inbounds, it will
override the request destination with the previously saved domain.

By default, v2ray cache up to 65535 addresses. The old records will
be discarded bases on LRU. The fake IP will be 240.x.x.x

* fix an edge case when encounter a fake IP in use

* Move lru to common.cache package

* Added the necessary change to obtain request IP from sniffer

* Refactor the code so that it may stop depending on global variables in the future.

* Replace string manipulation code with more generic codes, hopefully this will work for both IPv4 and IPv6 networks.

* Try to use IPv4 version of address if possible

* Added Test Case for Fake Dns

* Added More Test Case for Fake Dns

* Stop user from creating a instance with LRU size more than subnet size, it will create a infinite loop

* Move Fake DNS to a separate package

* Generated Code for fakedns

* Encapsulate Fake DNS as a Instance wide service

* Added Support for metadata sniffer, which will be used for Fake DNS

* Dependency injection for fake dns

* Fake DNS As a Sniffer

* Remove stub object

* Remove global variable

* Update generated protobuf file for metadata only sniffing

* Apply Fake DNS config to session

* Loading for fake dns settings

* Bug fix

* Include fake dns in all

* Fix FakeDns Lint Condition

* Fix sniffer config

* Fix lint message

* Fix dependency resolution

* Fix fake dns not loaded as sniffer

* reduce ttl for fake dns

* Apply Coding Style

* Apply Coding Style

* Apply Coding Style

* Apply Coding Style

* Apply Coding Style

* Fix crashed when no fake dns

* Apply Coding Style

* Fix Fake DNS do not apply to UDP socket

* Fixed a bug prevent FakeDNS App Setting from become effective

* Fixed a caveat prevent FakeDNS App Setting from become effective

* Use log comparison to reduce in issue when it comes to really high value typical for ipv6 subnet

* Add build tag for fakedns

* Removal of FakeDNS specific logic at DNS client: making it a standard dns client

* Regenerate auto generated file

* Amended version of configure file

* Bug fixes for fakeDNS

* Bug fixes for fakeDNS

* Fix test: remove reference to removed attribute

* Test: fix codacy issue

* Conf: Remove old field support

* Test: fix codacy issue

* Change test scale for TestFakeDnsHolderCreateMappingAndRollOver

* Test: fix codacy issue

Co-authored-by: yuhan6665 <1588741+yuhan6665@users.noreply.github.com>
Co-authored-by: loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>
Co-authored-by: kslr <kslrwang@gmail.com>
This commit is contained in:
Xiaokang Wang 2021-02-08 10:18:52 +00:00 committed by GitHub
parent d8bc41e653
commit 38da831b75
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
29 changed files with 1092 additions and 137 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
app/dispatcher/default.go
View File

@ -178,8 +178,12 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
}
func shouldOverride(result SniffResult, domainOverride []string) bool {
protocolString := result.Protocol()
if resComp, ok := result.(SnifferResultComposite); ok {
protocolString = resComp.ProtocolForDomainResult()
}
for _, p := range domainOverride {
if strings.HasPrefix(result.Protocol(), p) {
if strings.HasPrefix(protocolString, p) {
return true
}
}
@ -203,15 +207,29 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
ctx = session.ContextWithContent(ctx, content)
}
sniffingRequest := content.SniffingRequest
if destination.Network != net.Network_TCP || !sniffingRequest.Enabled {
switch {
case !sniffingRequest.Enabled:
go d.routedDispatch(ctx, outbound, destination)
} else {
case destination.Network != net.Network_TCP:
// Only metadata sniff will be used for non tcp connection
result, err := sniffer(ctx, nil, true)
if err == nil {
content.Protocol = result.Protocol()
if shouldOverride(result, sniffingRequest.OverrideDestinationForProtocol) {
domain := result.Domain()
newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
destination.Address = net.ParseAddress(domain)
ob.Target = destination
}
}
go d.routedDispatch(ctx, outbound, destination)
default:
go func() {
cReader := &cachedReader{
reader: outbound.Reader.(*pipe.Reader),
}
outbound.Reader = cReader
result, err := sniffer(ctx, cReader)
result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
if err == nil {
content.Protocol = result.Protocol()
}
@ -227,34 +245,50 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
return inbound, nil
}
func sniffer(ctx context.Context, cReader *cachedReader) (SniffResult, error) {
func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (SniffResult, error) {
payload := buf.New()
defer payload.Release()
sniffer := NewSniffer()
totalAttempt := 0
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
totalAttempt++
if totalAttempt > 2 {
return nil, errSniffingTimeout
}
sniffer := NewSniffer(ctx)
cReader.Cache(payload)
if !payload.IsEmpty() {
result, err := sniffer.Sniff(payload.Bytes())
if err != common.ErrNoClue {
return result, err
metaresult, metadataErr := sniffer.SniffMetadata(ctx)
if metadataOnly {
return metaresult, metadataErr
}
contentResult, contentErr := func() (SniffResult, error) {
totalAttempt := 0
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
totalAttempt++
if totalAttempt > 2 {
return nil, errSniffingTimeout
}
cReader.Cache(payload)
if !payload.IsEmpty() {
result, err := sniffer.Sniff(ctx, payload.Bytes())
if err != common.ErrNoClue {
return result, err
}
}
if payload.IsFull() {
return nil, errUnknownContent
}
}
if payload.IsFull() {
return nil, errUnknownContent
}
}
}()
if contentErr != nil && metadataErr == nil {
return metaresult, nil
}
if contentErr == nil && metadataErr == nil {
return CompositeResult(metaresult, contentResult), nil
}
return contentResult, contentErr
}
func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {

51
app/dispatcher/fakednssniffer.go Normal file
View File

@ -0,0 +1,51 @@
// +build !confonly
package dispatcher
import (
"context"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/common/net"
"v2ray.com/core/common/session"
"v2ray.com/core/features/dns"
)
// newFakeDNSSniffer Create a Fake DNS metadata sniffer
func newFakeDNSSniffer(ctx context.Context) (protocolSnifferWithMetadata, error) {
var fakeDNSEngine dns.FakeDNSEngine
err := core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
fakeDNSEngine = fdns
})
if err != nil {
return protocolSnifferWithMetadata{}, err
}
if fakeDNSEngine == nil {
errNotInit := newError("FakeDNSEngine is not initialized, but such a sniffer is used").AtError()
return protocolSnifferWithMetadata{}, errNotInit
}
return protocolSnifferWithMetadata{protocolSniffer: func(ctx context.Context, bytes []byte) (SniffResult, error) {
Target := session.OutboundFromContext(ctx).Target
if Target.Network == net.Network_TCP || Target.Network == net.Network_UDP {
domainFromFakeDNS := fakeDNSEngine.GetDomainFromFakeDNS(Target.Address)
if domainFromFakeDNS != "" {
newError("fake dns got domain: ", domainFromFakeDNS, " for ip: ", Target.Address.String()).WriteToLog(session.ExportIDToError(ctx))
return &fakeDNSSniffResult{domainName: domainFromFakeDNS}, nil
}
}
return nil, common.ErrNoClue
}, metadataSniffer: true}, nil
}
type fakeDNSSniffResult struct {
domainName string
}
func (fakeDNSSniffResult) Protocol() string {
return "fakedns"
}
func (f fakeDNSSniffResult) Domain() string {
return f.domainName
}

98
app/dispatcher/sniffer.go
View File

@ -3,6 +3,8 @@
package dispatcher
import (
"context"
"v2ray.com/core/common"
"v2ray.com/core/common/protocol/bittorrent"
"v2ray.com/core/common/protocol/http"
@ -14,30 +16,46 @@ type SniffResult interface {
Domain() string
}
type protocolSniffer func([]byte) (SniffResult, error)
type protocolSniffer func(context.Context, []byte) (SniffResult, error)
type Sniffer struct {
sniffer []protocolSniffer
type protocolSnifferWithMetadata struct {
protocolSniffer protocolSniffer
// A Metadata sniffer will be invoked on connection establishment only, with nil body,
// for both TCP and UDP connections
// It will not be shown as a traffic type for routing unless there is no other successful sniffing.
metadataSniffer bool
}
func NewSniffer() *Sniffer {
return &Sniffer{
sniffer: []protocolSniffer{
func(b []byte) (SniffResult, error) { return http.SniffHTTP(b) },
func(b []byte) (SniffResult, error) { return tls.SniffTLS(b) },
func(b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) },
type Sniffer struct {
sniffer []protocolSnifferWithMetadata
}
func NewSniffer(ctx context.Context) *Sniffer {
ret := &Sniffer{
sniffer: []protocolSnifferWithMetadata{
{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false},
{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false},
{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false},
},
}
if sniffer, err := newFakeDNSSniffer(ctx); err == nil {
ret.sniffer = append(ret.sniffer, sniffer)
}
return ret
}
var errUnknownContent = newError("unknown content")
func (s *Sniffer) Sniff(payload []byte) (SniffResult, error) {
var pendingSniffer []protocolSniffer
for _, s := range s.sniffer {
result, err := s(payload)
func (s *Sniffer) Sniff(c context.Context, payload []byte) (SniffResult, error) {
var pendingSniffer []protocolSnifferWithMetadata
for _, si := range s.sniffer {
s := si.protocolSniffer
if si.metadataSniffer {
continue
}
result, err := s(c, payload)
if err == common.ErrNoClue {
pendingSniffer = append(pendingSniffer, s)
pendingSniffer = append(pendingSniffer, si)
continue
}
@ -53,3 +71,55 @@ func (s *Sniffer) Sniff(payload []byte) (SniffResult, error) {
return nil, errUnknownContent
}
func (s *Sniffer) SniffMetadata(c context.Context) (SniffResult, error) {
var pendingSniffer []protocolSnifferWithMetadata
for _, si := range s.sniffer {
s := si.protocolSniffer
if !si.metadataSniffer {
pendingSniffer = append(pendingSniffer, si)
continue
}
result, err := s(c, nil)
if err == common.ErrNoClue {
pendingSniffer = append(pendingSniffer, si)
continue
}
if err == nil && result != nil {
return result, nil
}
}
if len(pendingSniffer) > 0 {
s.sniffer = pendingSniffer
return nil, common.ErrNoClue
}
return nil, errUnknownContent
}
func CompositeResult(domainResult SniffResult, protocolResult SniffResult) SniffResult {
return &compositeResult{domainResult: domainResult, protocolResult: protocolResult}
}
type compositeResult struct {
domainResult SniffResult
protocolResult SniffResult
}
func (c compositeResult) Protocol() string {
return c.protocolResult.Protocol()
}
func (c compositeResult) Domain() string {
return c.domainResult.Domain()
}
func (c compositeResult) ProtocolForDomainResult() string {
return c.domainResult.Protocol()
}
type SnifferResultComposite interface {
ProtocolForDomainResult() string
}

2
app/dns/config.proto
View File

@ -69,4 +69,6 @@ message Config {
// Tag is the inbound tag of DNS client.
string tag = 6;
reserved 7;
}

11
app/dns/dns.go
View File

@ -23,10 +23,10 @@ import (
// DNS is a DNS rely server.
type DNS struct {
sync.Mutex
tag string
hosts *StaticHosts
clients []*Client
tag string
hosts *StaticHosts
clients []*Client
ctx context.Context
domainMatcher strmatcher.IndexMatcher
matcherInfos []DomainMatcherInfo
}
@ -113,6 +113,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
tag: tag,
hosts: hosts,
clients: clients,
ctx: ctx,
domainMatcher: domainMatcher,
matcherInfos: matcherInfos,
}, nil
@ -189,7 +190,7 @@ func (s *DNS) lookupIPInternal(domain string, option IPOption) ([]net.IP, error)
// Name servers lookup
errs := []error{}
ctx := session.ContextWithInbound(context.Background(), &session.Inbound{Tag: s.tag})
ctx := session.ContextWithInbound(s.ctx, &session.Inbound{Tag: s.tag})
for _, client := range s.sortClients(domain) {
ips, err := client.QueryIP(ctx, domain, option)
if len(ips) > 0 {

9
app/dns/fakedns/errors.generated.go Normal file
View File

@ -0,0 +1,9 @@
package fakedns
import "v2ray.com/core/common/errors"
type errPathObjHolder struct{}
func newError(values ...interface{}) *errors.Error {
return errors.New(values...).WithPathObj(errPathObjHolder{})
}

132
app/dns/fakedns/fake.go Normal file
View File

@ -0,0 +1,132 @@
// +build !confonly
package fakedns
import (
"context"
"math"
"math/big"
gonet "net"
"v2ray.com/core/common"
"v2ray.com/core/common/cache"
"v2ray.com/core/common/net"
"v2ray.com/core/features/dns"
)
type Holder struct {
domainToIP cache.Lru
nextIP *big.Int
ipRange *gonet.IPNet
config *FakeDnsPool
}
func (*Holder) Type() interface{} {
return (*dns.FakeDNSEngine)(nil)
}
func (fkdns *Holder) Start() error {
return fkdns.initializeFromConfig()
}
func (fkdns *Holder) Close() error {
fkdns.domainToIP = nil
fkdns.nextIP = nil
fkdns.ipRange = nil
return nil
}
func NewFakeDNSHolder() (*Holder, error) {
var fkdns *Holder
var err error
if fkdns, err = NewFakeDNSHolderConfigOnly(nil); err != nil {
return nil, newError("Unable to create Fake Dns Engine").Base(err).AtError()
}
err = fkdns.initialize("240.0.0.0/8", 65535)
if err != nil {
return nil, err
}
return fkdns, nil
}
func NewFakeDNSHolderConfigOnly(conf *FakeDnsPool) (*Holder, error) {
return &Holder{nil, nil, nil, conf}, nil
}
func (fkdns *Holder) initializeFromConfig() error {
return fkdns.initialize(fkdns.config.IpPool, int(fkdns.config.LruSize))
}
func (fkdns *Holder) initialize(ipPoolCidr string, lruSize int) error {
var ipRange *gonet.IPNet
var ipaddr gonet.IP
var currentIP *big.Int
var err error
if ipaddr, ipRange, err = gonet.ParseCIDR(ipPoolCidr); err != nil {
return newError("Unable to parse CIDR for Fake DNS IP assignment").Base(err).AtError()
}
currentIP = big.NewInt(0).SetBytes(ipaddr)
if ipaddr.To4() != nil {
currentIP = big.NewInt(0).SetBytes(ipaddr.To4())
}
ones, bits := ipRange.Mask.Size()
rooms := bits - ones
if math.Log2(float64(lruSize)) >= float64(rooms) {
return newError("LRU size is bigger than subnet size").AtError()
}
fkdns.domainToIP = cache.NewLru(lruSize)
fkdns.ipRange = ipRange
fkdns.nextIP = currentIP
return nil
}
// GetFakeIPForDomain check and generate a fake IP for a domain name
func (fkdns *Holder) GetFakeIPForDomain(domain string) []net.Address {
if v, ok := fkdns.domainToIP.Get(domain); ok {
return []net.Address{v.(net.Address)}
}
var ip net.Address
for {
ip = net.IPAddress(fkdns.nextIP.Bytes())
fkdns.nextIP = fkdns.nextIP.Add(fkdns.nextIP, big.NewInt(1))
if !fkdns.ipRange.Contains(fkdns.nextIP.Bytes()) {
fkdns.nextIP = big.NewInt(0).SetBytes(fkdns.ipRange.IP)
}
// if we run for a long time, we may go back to beginning and start seeing the IP in use
if _, ok := fkdns.domainToIP.GetKeyFromValue(ip); !ok {
break
}
}
fkdns.domainToIP.Put(domain, ip)
return []net.Address{ip}
}
// GetDomainFromFakeDNS check if an IP is a fake IP and have corresponding domain name
func (fkdns *Holder) GetDomainFromFakeDNS(ip net.Address) string {
if !ip.Family().IsIP() || !fkdns.ipRange.Contains(ip.IP()) {
return ""
}
if k, ok := fkdns.domainToIP.GetKeyFromValue(ip); ok {
return k.(string)
}
return ""
}
func init() {
common.Must(common.RegisterConfig((*FakeDnsPool)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
var f *Holder
var err error
if f, err = NewFakeDNSHolderConfigOnly(config.(*FakeDnsPool)); err != nil {
return nil, err
}
return f, nil
}))
}

5
app/dns/fakedns/fakedns.go Normal file
View File

@ -0,0 +1,5 @@
// +build !confonly
package fakedns
//go:generate go run v2ray.com/core/common/errors/errorgen

164
app/dns/fakedns/fakedns.pb.go Normal file
View File

@ -0,0 +1,164 @@
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.25.0
// protoc v3.13.0
// source: app/dns/fakedns/fakedns.proto
package fakedns
import (
proto "github.com/golang/protobuf/proto"
protoreflect "google.golang.org/protobuf/reflect/protoreflect"
protoimpl "google.golang.org/protobuf/runtime/protoimpl"
reflect "reflect"
sync "sync"
)
const (
// Verify that this generated code is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
// Verify that runtime/protoimpl is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)
// This is a compile-time assertion that a sufficiently up-to-date version
// of the legacy proto package is being used.
const _ = proto.ProtoPackageIsVersion4
type FakeDnsPool struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
IpPool string `protobuf:"bytes,1,opt,name=ip_pool,json=ipPool,proto3" json:"ip_pool,omitempty"` //CIDR of IP pool used as fake DNS IP
LruSize int64 `protobuf:"varint,2,opt,name=lruSize,proto3" json:"lruSize,omitempty"` //Size of Pool for remembering relationship between domain name and IP address
}
func (x *FakeDnsPool) Reset() {
*x = FakeDnsPool{}
if protoimpl.UnsafeEnabled {
mi := &file_app_dns_fakedns_fakedns_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *FakeDnsPool) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*FakeDnsPool) ProtoMessage() {}
func (x *FakeDnsPool) ProtoReflect() protoreflect.Message {
mi := &file_app_dns_fakedns_fakedns_proto_msgTypes[0]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use FakeDnsPool.ProtoReflect.Descriptor instead.
func (*FakeDnsPool) Descriptor() ([]byte, []int) {
return file_app_dns_fakedns_fakedns_proto_rawDescGZIP(), []int{0}
}
func (x *FakeDnsPool) GetIpPool() string {
if x != nil {
return x.IpPool
}
return ""
}
func (x *FakeDnsPool) GetLruSize() int64 {
if x != nil {
return x.LruSize
}
return 0
}
var File_app_dns_fakedns_fakedns_proto protoreflect.FileDescriptor
var file_app_dns_fakedns_fakedns_proto_rawDesc = []byte{
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}
var (
file_app_dns_fakedns_fakedns_proto_rawDescOnce sync.Once
file_app_dns_fakedns_fakedns_proto_rawDescData = file_app_dns_fakedns_fakedns_proto_rawDesc
)
func file_app_dns_fakedns_fakedns_proto_rawDescGZIP() []byte {
file_app_dns_fakedns_fakedns_proto_rawDescOnce.Do(func() {
file_app_dns_fakedns_fakedns_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_dns_fakedns_fakedns_proto_rawDescData)
})
return file_app_dns_fakedns_fakedns_proto_rawDescData
}
var file_app_dns_fakedns_fakedns_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
var file_app_dns_fakedns_fakedns_proto_goTypes = []interface{}{
(*FakeDnsPool)(nil), // 0: v2ray.core.app.dns.fakedns.FakeDnsPool
}
var file_app_dns_fakedns_fakedns_proto_depIdxs = []int32{
0, // [0:0] is the sub-list for method output_type
0, // [0:0] is the sub-list for method input_type
0, // [0:0] is the sub-list for extension type_name
0, // [0:0] is the sub-list for extension extendee
0, // [0:0] is the sub-list for field type_name
}
func init() { file_app_dns_fakedns_fakedns_proto_init() }
func file_app_dns_fakedns_fakedns_proto_init() {
if File_app_dns_fakedns_fakedns_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_app_dns_fakedns_fakedns_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*FakeDnsPool); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
}
type x struct{}
out := protoimpl.TypeBuilder{
File: protoimpl.DescBuilder{
GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
RawDescriptor: file_app_dns_fakedns_fakedns_proto_rawDesc,
NumEnums: 0,
NumMessages: 1,
NumExtensions: 0,
NumServices: 0,
},
GoTypes: file_app_dns_fakedns_fakedns_proto_goTypes,
DependencyIndexes: file_app_dns_fakedns_fakedns_proto_depIdxs,
MessageInfos: file_app_dns_fakedns_fakedns_proto_msgTypes,
}.Build()
File_app_dns_fakedns_fakedns_proto = out.File
file_app_dns_fakedns_fakedns_proto_rawDesc = nil
file_app_dns_fakedns_fakedns_proto_goTypes = nil
file_app_dns_fakedns_fakedns_proto_depIdxs = nil
}

12
app/dns/fakedns/fakedns.proto Normal file
View File

@ -0,0 +1,12 @@
syntax = "proto3";
package v2ray.core.app.dns.fakedns;
option csharp_namespace = "V2Ray.Core.App.Dns.Fakedns";
option go_package = "v2ray.com/core/app/dns/fakedns";
option java_package = "com.v2ray.core.app.dns.fakedns";
option java_multiple_files = true;
message FakeDnsPool{
string ip_pool = 1; //CIDR of IP pool used as fake DNS IP
int64 lruSize = 2; //Size of Pool for remembering relationship between domain name and IP address
}

114
app/dns/fakedns/fakedns_test.go Normal file
View File

@ -0,0 +1,114 @@
package fakedns
import (
"testing"
"github.com/stretchr/testify/assert"
"v2ray.com/core/common"
"v2ray.com/core/common/net"
"v2ray.com/core/common/uuid"
)
func TestNewFakeDnsHolder(_ *testing.T) {
_, err := NewFakeDNSHolder()
common.Must(err)
}
func TestFakeDnsHolderCreateMapping(t *testing.T) {
fkdns, err := NewFakeDNSHolder()
common.Must(err)
addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
assert.Equal(t, "240.0.0.0", addr[0].IP().String())
}
func TestFakeDnsHolderCreateMappingMany(t *testing.T) {
fkdns, err := NewFakeDNSHolder()
common.Must(err)
addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
assert.Equal(t, "240.0.0.0", addr[0].IP().String())
addr2 := fkdns.GetFakeIPForDomain("fakednstest2.v2fly.org")
assert.Equal(t, "240.0.0.1", addr2[0].IP().String())
}
func TestFakeDnsHolderCreateMappingManyAndResolve(t *testing.T) {
fkdns, err := NewFakeDNSHolder()
common.Must(err)
{
addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
assert.Equal(t, "240.0.0.0", addr[0].IP().String())
}
{
addr2 := fkdns.GetFakeIPForDomain("fakednstest2.v2fly.org")
assert.Equal(t, "240.0.0.1", addr2[0].IP().String())
}
{
result := fkdns.GetDomainFromFakeDNS(net.ParseAddress("240.0.0.0"))
assert.Equal(t, "fakednstest.v2fly.org", result)
}
{
result := fkdns.GetDomainFromFakeDNS(net.ParseAddress("240.0.0.1"))
assert.Equal(t, "fakednstest2.v2fly.org", result)
}
}
func TestFakeDnsHolderCreateMappingManySingleDomain(t *testing.T) {
fkdns, err := NewFakeDNSHolder()
common.Must(err)
addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
assert.Equal(t, "240.0.0.0", addr[0].IP().String())
addr2 := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
assert.Equal(t, "240.0.0.0", addr2[0].IP().String())
}
func TestFakeDnsHolderCreateMappingAndRollOver(t *testing.T) {
fkdns, err := NewFakeDNSHolderConfigOnly(&FakeDnsPool{
IpPool: "240.0.0.0/12",
LruSize: 256,
})
common.Must(err)
err = fkdns.Start()
common.Must(err)
{
addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
assert.Equal(t, "240.0.0.0", addr[0].IP().String())
}
{
addr2 := fkdns.GetFakeIPForDomain("fakednstest2.v2fly.org")
assert.Equal(t, "240.0.0.1", addr2[0].IP().String())
}
for i := 0; i <= 8192; i++ {
{
result := fkdns.GetDomainFromFakeDNS(net.ParseAddress("240.0.0.0"))
assert.Equal(t, "fakednstest.v2fly.org", result)
}
{
result := fkdns.GetDomainFromFakeDNS(net.ParseAddress("240.0.0.1"))
assert.Equal(t, "fakednstest2.v2fly.org", result)
}
{
uuid := uuid.New()
domain := uuid.String() + ".fakednstest.v2fly.org"
addr := fkdns.GetFakeIPForDomain(domain)
rsaddr := addr[0].IP().String()
result := fkdns.GetDomainFromFakeDNS(net.ParseAddress(rsaddr))
assert.Equal(t, domain, result)
}
}
}

2
app/dns/nameserver.go
View File

@ -55,6 +55,8 @@ func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, err
return NewDoHLocalNameServer(u), nil
case u.Scheme == "quic+local": // DNS-over-QUIC Local mode
return NewQUICNameServer(u)
case u.String() == "fakedns":
return NewFakeDNSServer(), nil
}
}
if dest.Network == net.Network_Unknown {

41
app/dns/nameserver_fakedns.go Normal file
View File

@ -0,0 +1,41 @@
// +build !confonly
package dns
import (
"context"
"v2ray.com/core"
"v2ray.com/core/common/net"
"v2ray.com/core/features/dns"
)
type FakeDNSServer struct {
fakeDNSEngine dns.FakeDNSEngine
}
func NewFakeDNSServer() *FakeDNSServer {
return &FakeDNSServer{}
}
func (FakeDNSServer) Name() string {
return "FakeDNS"
}
func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ net.IP, _ IPOption) ([]net.IP, error) {
if f.fakeDNSEngine == nil {
if err := core.RequireFeatures(ctx, func(fd dns.FakeDNSEngine) {
f.fakeDNSEngine = fd
}); err != nil {
return nil, newError("Unable to locate a fake DNS Engine").Base(err).AtError()
}
}
ips := f.fakeDNSEngine.GetFakeIPForDomain(domain)
netIP, err := toNetIP(ips)
if err != nil {
return nil, newError("Unable to convert IP to net ip").Base(err).AtError()
}
return netIP, nil
}

194
app/proxyman/config.pb.go
View File

@ -239,8 +239,11 @@ type SniffingConfig struct {
// Whether or not to enable content sniffing on an inbound connection.
Enabled bool `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
// Override target destination if sniff'ed protocol is in the given list.
// Supported values are "http", "tls".
// Supported values are "http", "tls", "fakedns".
DestinationOverride []string `protobuf:"bytes,2,rep,name=destination_override,json=destinationOverride,proto3" json:"destination_override,omitempty"`
// Whether should only try to sniff metadata without waiting for client input.
// Can be used to support SMTP like protocol where server send the first message.
MetadataOnly bool `protobuf:"varint,3,opt,name=metadata_only,json=metadataOnly,proto3" json:"metadata_only,omitempty"`
}
func (x *SniffingConfig) Reset() {
@ -289,6 +292,13 @@ func (x *SniffingConfig) GetDestinationOverride() []string {
return nil
}
func (x *SniffingConfig) GetMetadataOnly() bool {
if x != nil {
return x.MetadataOnly
}
return false
}
type ReceiverConfig struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -757,97 +767,99 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
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}
var (

6
app/proxyman/config.proto
View File

@ -54,8 +54,12 @@ message SniffingConfig {
bool enabled = 1;
// Override target destination if sniff'ed protocol is in the given list.
// Supported values are "http", "tls".
// Supported values are "http", "tls", "fakedns".
repeated string destination_override = 2;
// Whether should only try to sniff metadata without waiting for client input.
// Can be used to support SMTP like protocol where server send the first message.
bool metadata_only = 3;
}
message ReceiverConfig {

2
app/proxyman/inbound/always.go
View File

@ -128,11 +128,13 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
if net.HasNetwork(nl, net.Network_UDP) {
worker := &udpWorker{
ctx: ctx,
tag: tag,
proxy: p,
address: address,
port: net.Port(port),
dispatcher: h.mux,
sniffingConfig: receiverConfig.GetEffectiveSniffingSettings(),
uplinkCounter: uplinkCounter,
downlinkCounter: downlinkCounter,
stream: mss,

2
app/proxyman/inbound/dynamic.go
View File

@ -148,11 +148,13 @@ func (h *DynamicInboundHandler) refresh() error {
if net.HasNetwork(nl, net.Network_UDP) {
worker := &udpWorker{
ctx: h.ctx,
tag: h.tag,
proxy: p,
address: address,
port: port,
dispatcher: h.mux,
sniffingConfig: h.receiverConfig.GetEffectiveSniffingSettings(),
uplinkCounter: uplinkCounter,
downlinkCounter: downlinkCounter,
stream: h.streamSettings,

14
app/proxyman/inbound/worker.go
View File

@ -87,6 +87,7 @@ func (w *tcpWorker) callback(conn internet.Connection) {
if w.sniffingConfig != nil {
content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
}
ctx = session.ContextWithContent(ctx, content)
if w.uplinkCounter != nil || w.downlinkCounter != nil {
@ -230,11 +231,14 @@ type udpWorker struct {
tag string
stream *internet.MemoryStreamConfig
dispatcher routing.Dispatcher
sniffingConfig *proxyman.SniffingConfig
uplinkCounter stats.Counter
downlinkCounter stats.Counter
checker *task.Periodic
activeConn map[connID]*udpConn
ctx context.Context
}
func (w *udpWorker) getConnection(id connID) (*udpConn, bool) {
@ -286,7 +290,7 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
common.Must(w.checker.Start())
go func() {
ctx := context.Background()
ctx := w.ctx
sid := session.NewID()
ctx = session.ContextWithID(ctx, sid)
@ -300,6 +304,13 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
Gateway: net.UDPDestination(w.address, w.port),
Tag: w.tag,
})
content := new(session.Content)
if w.sniffingConfig != nil {
content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
}
ctx = session.ContextWithContent(ctx, content)
if err := w.proxy.Process(ctx, net.Network_UDP, conn, w.dispatcher); err != nil {
newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
@ -428,6 +439,7 @@ func (w *dsWorker) callback(conn internet.Connection) {
if w.sniffingConfig != nil {
content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
}
ctx = session.ContextWithContent(ctx, content)
if w.uplinkCounter != nil || w.downlinkCounter != nil {

76
common/cache/lru.go vendored Normal file
View File

@ -0,0 +1,76 @@
package cache
import (
"container/list"
sync "sync"
)
// Lru simple, fast lru cache implementation
type Lru interface {
Get(key interface{}) (value interface{}, ok bool)
GetKeyFromValue(value interface{}) (key interface{}, ok bool)
Put(key, value interface{})
}
type lru struct {
capacity int
doubleLinkedlist *list.List
keyToElement *sync.Map
valueToElement *sync.Map
mu *sync.Mutex
}
type lruElement struct {
key interface{}
value interface{}
}
// NewLru init a lru cache
func NewLru(cap int) Lru {
return lru{
capacity: cap,
doubleLinkedlist: list.New(),
keyToElement: new(sync.Map),
valueToElement: new(sync.Map),
mu: new(sync.Mutex),
}
}
func (l lru) Get(key interface{}) (value interface{}, ok bool) {
if v, ok := l.keyToElement.Load(key); ok {
element := v.(*list.Element)
l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
return element.Value.(lruElement).value, true
}
return nil, false
}
func (l lru) GetKeyFromValue(value interface{}) (key interface{}, ok bool) {
if k, ok := l.valueToElement.Load(value); ok {
element := k.(*list.Element)
l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
return element.Value.(lruElement).key, true
}
return nil, false
}
func (l lru) Put(key, value interface{}) {
e := lruElement{key, value}
if v, ok := l.keyToElement.Load(key); ok {
element := v.(*list.Element)
element.Value = e
l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
} else {
l.mu.Lock()
element := l.doubleLinkedlist.PushFront(e)
l.keyToElement.Store(key, element)
l.valueToElement.Store(value, element)
if l.doubleLinkedlist.Len() > l.capacity {
toBeRemove := l.doubleLinkedlist.Back()
l.doubleLinkedlist.Remove(toBeRemove)
l.keyToElement.Delete(toBeRemove.Value.(lruElement).key)
l.valueToElement.Delete(toBeRemove.Value.(lruElement).value)
}
l.mu.Unlock()
}
}

69
common/cache/lru_test.go vendored Normal file
View File

@ -0,0 +1,69 @@
package cache_test
import (
"testing"
. "v2ray.com/core/common/cache"
)
func TestLruReplaceValue(t *testing.T) {
lru := NewLru(2)
lru.Put(2, 6)
lru.Put(1, 5)
lru.Put(1, 2)
v, _ := lru.Get(1)
if v != 2 {
t.Error("should get 2", v)
}
v, _ = lru.Get(2)
if v != 6 {
t.Error("should get 6", v)
}
}
func TestLruRemoveOld(t *testing.T) {
lru := NewLru(2)
v, ok := lru.Get(2)
if ok {
t.Error("should get nil", v)
}
lru.Put(1, 1)
lru.Put(2, 2)
v, _ = lru.Get(1)
if v != 1 {
t.Error("should get 1", v)
}
lru.Put(3, 3)
v, ok = lru.Get(2)
if ok {
t.Error("should get nil", v)
}
lru.Put(4, 4)
v, ok = lru.Get(1)
if ok {
t.Error("should get nil", v)
}
v, _ = lru.Get(3)
if v != 3 {
t.Error("should get 3", v)
}
v, _ = lru.Get(4)
if v != 4 {
t.Error("should get 4", v)
}
}
func TestGetKeyFromValue(t *testing.T) {
lru := NewLru(2)
lru.Put(3, 3)
lru.Put(2, 2)
lru.Put(1, 1)
v, ok := lru.GetKeyFromValue(3)
if ok {
t.Error("should get nil", v)
}
v, _ = lru.GetKeyFromValue(2)
if v != 2 {
t.Error("should get 2", v)
}
}

1
common/session/session.go
View File

@ -57,6 +57,7 @@ type Outbound struct {
type SniffingRequest struct {
OverrideDestinationForProtocol []string
Enabled bool
MetadataOnly bool
}
// Content is the metadata of the connection content.

12
features/dns/fakedns.go Normal file
View File

@ -0,0 +1,12 @@
package dns
import (
"v2ray.com/core/common/net"
"v2ray.com/core/features"
)
type FakeDNSEngine interface {
features.Feature
GetFakeIPForDomain(domain string) []net.Address
GetDomainFromFakeDNS(ip net.Address) string
}

9
features/dns/localdns/errors.generated.go Normal file
View File

@ -0,0 +1,9 @@
package localdns
import "v2ray.com/core/common/errors"
type errPathObjHolder struct{}
func newError(values ...interface{}) *errors.Error {
return errors.New(values...).WithPathObj(errPathObjHolder{})
}

65
infra/conf/fakedns.go Normal file
View File

@ -0,0 +1,65 @@
package conf
import (
"github.com/golang/protobuf/proto"
"v2ray.com/core/app/dns/fakedns"
)
type FakeDNSConfig struct {
IPPool string `json:"ipPool"`
LruSize int64 `json:"poolSize"`
}
func (f FakeDNSConfig) Build() (proto.Message, error) {
return &fakedns.FakeDnsPool{
IpPool: f.IPPool,
LruSize: f.LruSize,
}, nil
}
type FakeDNSPostProcessingStage struct{}
func (FakeDNSPostProcessingStage) Process(conf *Config) error {
var fakeDNSInUse bool
if conf.DNSConfig != nil {
for _, v := range conf.DNSConfig.Servers {
if v.Address.Family().IsDomain() {
if v.Address.Domain() == "fakedns" {
fakeDNSInUse = true
}
}
}
}
if fakeDNSInUse {
if conf.FakeDNS == nil {
// Add a Fake DNS Config if there is none
conf.FakeDNS = &FakeDNSConfig{
IPPool: "240.0.0.0/8",
LruSize: 65535,
}
}
found := false
// Check if there is a Outbound with necessary sniffer on
var inbounds []InboundDetourConfig
if len(conf.InboundConfigs) > 0 {
inbounds = append(inbounds, conf.InboundConfigs...)
}
for _, v := range inbounds {
if v.SniffingConfig != nil && v.SniffingConfig.Enabled && v.SniffingConfig.DestOverride != nil {
for _, dov := range *v.SniffingConfig.DestOverride {
if dov == "fakedns" {
found = true
}
}
}
}
if !found {
newError("Defined Fake DNS but haven't enabled fake dns sniffing at any inbound.").AtWarning().WriteToLog()
}
}
return nil
}

5
infra/conf/init.go Normal file
View File

@ -0,0 +1,5 @@
package conf
func init() {
RegisterConfigureFilePostProcessingStage("FakeDNS", &FakeDNSPostProcessingStage{})
}

23
infra/conf/lint.go Normal file
View File

@ -0,0 +1,23 @@
package conf
type ConfigureFilePostProcessingStage interface {
Process(conf *Config) error
}
var configureFilePostProcessingStages map[string]ConfigureFilePostProcessingStage
func RegisterConfigureFilePostProcessingStage(name string, stage ConfigureFilePostProcessingStage) {
if configureFilePostProcessingStages == nil {
configureFilePostProcessingStages = make(map[string]ConfigureFilePostProcessingStage)
}
configureFilePostProcessingStages[name] = stage
}
func PostProcessConfigureFile(conf *Config) error {
for k, v := range configureFilePostProcessingStages {
if err := v.Process(conf); err != nil {
return newError("Rejected by Postprocessing Stage ", k).AtError().Base(err)
}
}
return nil
}

21
infra/conf/v2ray.go
View File

@ -59,6 +59,7 @@ func toProtocolList(s []string) ([]proxyman.KnownProtocols, error) {
type SniffingConfig struct {
Enabled bool `json:"enabled"`
DestOverride *StringList `json:"destOverride"`
MetadataOnly bool `json:"metadataOnly"`
}
// Build implements Buildable.
@ -71,6 +72,8 @@ func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
p = append(p, "http")
case "tls", "https", "ssl":
p = append(p, "tls")
case "fakedns":
p = append(p, "fakedns")
default:
return nil, newError("unknown protocol: ", domainOverride)
}
@ -80,6 +83,7 @@ func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
return &proxyman.SniffingConfig{
Enabled: c.Enabled,
DestinationOverride: p,
MetadataOnly: c.MetadataOnly,
}, nil
}
@ -346,6 +350,7 @@ type Config struct {
API *APIConfig `json:"api"`
Stats *StatsConfig `json:"stats"`
Reverse *ReverseConfig `json:"reverse"`
FakeDNS *FakeDNSConfig `json:"fakeDns"`
}
func (c *Config) findInboundTag(tag string) int {
@ -399,6 +404,10 @@ func (c *Config) Override(o *Config, fn string) {
c.Reverse = o.Reverse
}
if o.FakeDNS != nil {
c.FakeDNS = o.FakeDNS
}
// deprecated attrs... keep them for now
if o.InboundConfig != nil {
c.InboundConfig = o.InboundConfig
@ -470,6 +479,10 @@ func applyTransportConfig(s *StreamConfig, t *TransportConfig) {
// Build implements Buildable.
func (c *Config) Build() (*core.Config, error) {
if err := PostProcessConfigureFile(c); err != nil {
return nil, err
}
config := &core.Config{
App: []*serial.TypedMessage{
serial.ToTypedMessage(&dispatcher.Config{}),
@ -536,6 +549,14 @@ func (c *Config) Build() (*core.Config, error) {
config.App = append(config.App, serial.ToTypedMessage(r))
}
if c.FakeDNS != nil {
r, err := c.FakeDNS.Build()
if err != nil {
return nil, err
}
config.App = append(config.App, serial.ToTypedMessage(r))
}
var inbounds []InboundDetourConfig
if c.InboundConfig != nil {

1
main/distro/all/all.go
View File

@ -16,6 +16,7 @@ import (
// Other optional features.
_ "v2ray.com/core/app/dns"
_ "v2ray.com/core/app/dns/fakedns"
_ "v2ray.com/core/app/log"
_ "v2ray.com/core/app/policy"
_ "v2ray.com/core/app/reverse"

6
proxy/dns/dns.go
View File

@ -38,6 +38,7 @@ type ownLinkVerifier interface {
}
type Handler struct {
client dns.Client
ipv4Lookup dns.IPv4Lookup
ipv6Lookup dns.IPv6Lookup
ownLinkVerifier ownLinkVerifier
@ -45,6 +46,7 @@ type Handler struct {
}
func (h *Handler) Init(config *Config, dnsClient dns.Client) error {
h.client = dnsClient
ipv4lookup, ok := dnsClient.(dns.IPv4Lookup)
if !ok {
return newError("dns.Client doesn't implement IPv4Lookup")
@ -211,6 +213,8 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
var ips []net.IP
var err error
var ttl uint32 = 600
switch qType {
case dnsmessage.TypeA:
ips, err = h.ipv4Lookup.LookupIPv4(domain)
@ -243,7 +247,7 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
}))
common.Must(builder.StartAnswers())
rHeader := dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName(domain), Class: dnsmessage.ClassINET, TTL: 600}
rHeader := dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName(domain), Class: dnsmessage.ClassINET, TTL: ttl}
for _, ip := range ips {
if len(ip) == net.IPv4len {
var r dnsmessage.AResource