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refactor: new dns app

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This commit is contained in:
AkinoKaede 2021-03-18 23:24:24 +08:00
parent 4e63c22197
commit 8884e948fe
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GPG key ID: C687746B27587C0D
24 changed files with 1240 additions and 620 deletions
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7
app/dispatcher/default.go
View file

@ -309,15 +309,10 @@ func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (Sni
func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {
var handler outbound.Handler
skipRoutePick := false
if content := session.ContentFromContext(ctx); content != nil {
skipRoutePick = content.SkipRoutePick
}
routingLink := routing_session.AsRoutingContext(ctx)
inTag := routingLink.GetInboundTag()
isPickRoute := false
if d.router != nil && !skipRoutePick {
if d.router != nil {
if route, err := d.router.PickRoute(routingLink); err == nil {
outTag := route.GetOutboundTag()
isPickRoute = true

63
app/dns/config.go Normal file
View file

@ -0,0 +1,63 @@
package dns
import (
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/strmatcher"
"github.com/xtls/xray-core/common/uuid"
)
var typeMap = map[DomainMatchingType]strmatcher.Type{
DomainMatchingType_Full: strmatcher.Full,
DomainMatchingType_Subdomain: strmatcher.Domain,
DomainMatchingType_Keyword: strmatcher.Substr,
DomainMatchingType_Regex: strmatcher.Regex,
}
// References:
// https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
// https://unix.stackexchange.com/questions/92441/whats-the-difference-between-local-home-and-lan
var localTLDsAndDotlessDomains = []*NameServer_PriorityDomain{
{Type: DomainMatchingType_Regex, Domain: "^[^.]+$"}, // This will only match domains without any dot
{Type: DomainMatchingType_Subdomain, Domain: "local"},
{Type: DomainMatchingType_Subdomain, Domain: "localdomain"},
{Type: DomainMatchingType_Subdomain, Domain: "localhost"},
{Type: DomainMatchingType_Subdomain, Domain: "lan"},
{Type: DomainMatchingType_Subdomain, Domain: "home.arpa"},
{Type: DomainMatchingType_Subdomain, Domain: "example"},
{Type: DomainMatchingType_Subdomain, Domain: "invalid"},
{Type: DomainMatchingType_Subdomain, Domain: "test"},
}
var localTLDsAndDotlessDomainsRule = &NameServer_OriginalRule{
Rule: "geosite:private",
Size: uint32(len(localTLDsAndDotlessDomains)),
}
func toStrMatcher(t DomainMatchingType, domain string) (strmatcher.Matcher, error) {
strMType, f := typeMap[t]
if !f {
return nil, newError("unknown mapping type", t).AtWarning()
}
matcher, err := strMType.New(domain)
if err != nil {
return nil, newError("failed to create str matcher").Base(err)
}
return matcher, nil
}
func toNetIP(addrs []net.Address) ([]net.IP, error) {
ips := make([]net.IP, 0, len(addrs))
for _, addr := range addrs {
if addr.Family().IsIP() {
ips = append(ips, addr.IP())
} else {
return nil, newError("Failed to convert address", addr, "to Net IP.").AtWarning()
}
}
return ips, nil
}
func generateRandomTag() string {
id := uuid.New()
return "xray.system." + id.String()
}

160
app/dns/config.pb.go
View file

@ -1,7 +1,7 @@
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.25.0
// protoc v3.14.0
// protoc v3.15.6
// source: app/dns/config.proto
package dns
@ -85,6 +85,7 @@ type NameServer struct {
unknownFields protoimpl.UnknownFields
Address *net.Endpoint `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
ClientIp []byte `protobuf:"bytes,5,opt,name=client_ip,json=clientIp,proto3" json:"client_ip,omitempty"`
PrioritizedDomain []*NameServer_PriorityDomain `protobuf:"bytes,2,rep,name=prioritized_domain,json=prioritizedDomain,proto3" json:"prioritized_domain,omitempty"`
Geoip []*router.GeoIP `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"`
OriginalRules []*NameServer_OriginalRule `protobuf:"bytes,4,rep,name=original_rules,json=originalRules,proto3" json:"original_rules,omitempty"`
@ -129,6 +130,13 @@ func (x *NameServer) GetAddress() *net.Endpoint {
return nil
}
func (x *NameServer) GetClientIp() []byte {
if x != nil {
return x.ClientIp
}
return nil
}
func (x *NameServer) GetPrioritizedDomain() []*NameServer_PriorityDomain {
if x != nil {
return x.PrioritizedDomain
@ -174,6 +182,8 @@ type Config struct {
StaticHosts []*Config_HostMapping `protobuf:"bytes,4,rep,name=static_hosts,json=staticHosts,proto3" json:"static_hosts,omitempty"`
// Tag is the inbound tag of DNS client.
Tag string `protobuf:"bytes,6,opt,name=tag,proto3" json:"tag,omitempty"`
// DisableCache Disable DNS cache
DisableCache bool `protobuf:"varint,8,opt,name=disableCache,proto3" json:"disableCache,omitempty"`
}
func (x *Config) Reset() {
@ -252,6 +262,13 @@ func (x *Config) GetTag() string {
return ""
}
func (x *Config) GetDisableCache() bool {
if x != nil {
return x.DisableCache
}
return false
}
type NameServer_PriorityDomain struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -446,77 +463,82 @@ var file_app_dns_config_proto_rawDesc = []byte{
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}
var (

4
app/dns/config.proto
View file

@ -12,6 +12,7 @@ import "app/router/config.proto";
message NameServer {
xray.common.net.Endpoint address = 1;
bytes client_ip = 5;
message PriorityDomain {
DomainMatchingType type = 1;
@ -70,4 +71,7 @@ message Config {
string tag = 6;
reserved 7;
// DisableCache Disable DNS cache
bool disableCache = 8;
}

230
app/dns/dns.go
View file

@ -2,3 +2,233 @@
package dns
//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
import (
"context"
"fmt"
"strings"
"sync"
"github.com/xtls/xray-core/app/router"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/strmatcher"
"github.com/xtls/xray-core/features"
"github.com/xtls/xray-core/features/dns"
)
// DNS is a DNS rely server.
type DNS struct {
sync.Mutex
tag string
disableCache bool
hosts *StaticHosts
clients []*Client
ctx context.Context
domainMatcher strmatcher.IndexMatcher
matcherInfos []DomainMatcherInfo
}
// DomainMatcherInfo contains information attached to index returned by Server.domainMatcher
type DomainMatcherInfo struct {
clientIdx uint16
domainRuleIdx uint16
}
// New creates a new DNS server with given configuration.
func New(ctx context.Context, config *Config) (*DNS, error) {
var tag string
if len(config.Tag) > 0 {
tag = config.Tag
} else {
tag = generateRandomTag()
}
var clientIP net.IP
switch len(config.ClientIp) {
case 0, net.IPv4len, net.IPv6len:
clientIP = net.IP(config.ClientIp)
default:
return nil, newError("unexpected client IP length ", len(config.ClientIp))
}
hosts, err := NewStaticHosts(config.StaticHosts, config.Hosts)
if err != nil {
return nil, newError("failed to create hosts").Base(err)
}
clients := []*Client{}
domainRuleCount := 0
for _, ns := range config.NameServer {
domainRuleCount += len(ns.PrioritizedDomain)
}
// MatcherInfos is ensured to cover the maximum index domainMatcher could return, where matcher's index starts from 1
matcherInfos := make([]DomainMatcherInfo, domainRuleCount+1)
domainMatcher := &strmatcher.MatcherGroup{}
geoipContainer := router.GeoIPMatcherContainer{}
for _, endpoint := range config.NameServers {
features.PrintDeprecatedFeatureWarning("simple DNS server")
client, err := NewSimpleClient(ctx, endpoint, clientIP)
if err != nil {
return nil, newError("failed to create client").Base(err)
}
clients = append(clients, client)
}
for _, ns := range config.NameServer {
clientIdx := len(clients)
updateDomain := func(domainRule strmatcher.Matcher, originalRuleIdx int, matcherInfos []DomainMatcherInfo) error {
midx := domainMatcher.Add(domainRule)
matcherInfos[midx] = DomainMatcherInfo{
clientIdx: uint16(clientIdx),
domainRuleIdx: uint16(originalRuleIdx),
}
return nil
}
myClientIP := clientIP
switch len(ns.ClientIp) {
case net.IPv4len, net.IPv6len:
myClientIP = net.IP(ns.ClientIp)
}
client, err := NewClient(ctx, ns, myClientIP, geoipContainer, &matcherInfos, updateDomain)
if err != nil {
return nil, newError("failed to create client").Base(err)
}
clients = append(clients, client)
}
// If there is no DNS client in config, add a `localhost` DNS client
if len(clients) == 0 {
clients = append(clients, NewLocalDNSClient())
}
return &DNS{
tag: tag,
hosts: hosts,
clients: clients,
ctx: ctx,
domainMatcher: domainMatcher,
matcherInfos: matcherInfos,
disableCache: config.DisableCache,
}, nil
}
// Type implements common.HasType.
func (*DNS) Type() interface{} {
return dns.ClientType()
}
// Start implements common.Runnable.
func (s *DNS) Start() error {
return nil
}
// Close implements common.Closable.
func (s *DNS) Close() error {
return nil
}
// IsOwnLink implements proxy.dns.ownLinkVerifier
func (s *DNS) IsOwnLink(ctx context.Context) bool {
inbound := session.InboundFromContext(ctx)
return inbound != nil && inbound.Tag == s.tag
}
// LookupIP implements dns.Client.
func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, error) {
if domain == "" {
return nil, newError("empty domain name")
}
// Normalize the FQDN form query
if strings.HasSuffix(domain, ".") {
domain = domain[:len(domain)-1]
}
// Static host lookup
switch addrs := s.hosts.Lookup(domain, option); {
case addrs == nil: // Domain not recorded in static host
break
case len(addrs) == 0: // Domain recorded, but no valid IP returned (e.g. IPv4 address with only IPv6 enabled)
return nil, dns.ErrEmptyResponse
case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Domain replacement
newError("domain replaced: ", domain, " -> ", addrs[0].Domain()).WriteToLog()
domain = addrs[0].Domain()
default: // Successfully found ip records in static host
newError("returning ", len(addrs), " IPs for domain ", domain).WriteToLog()
return toNetIP(addrs)
}
// Name servers lookup
errs := []error{}
ctx := session.ContextWithInbound(s.ctx, &session.Inbound{Tag: s.tag})
for _, client := range s.sortClients(domain) {
if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
newError("skip DNS resolution for domain ", domain, " at server ", client.Name()).AtDebug().WriteToLog()
continue
}
ips, err := client.QueryIP(ctx, domain, option, s.disableCache)
if len(ips) > 0 {
return ips, nil
}
if err != nil {
newError("failed to lookup ip for domain ", domain, " at server ", client.Name()).Base(err).WriteToLog()
errs = append(errs, err)
}
if err != context.Canceled && err != context.DeadlineExceeded && err != errExpectedIPNonMatch {
return nil, err
}
}
return nil, newError("returning nil for domain ", domain).Base(errors.Combine(errs...))
}
func (s *DNS) sortClients(domain string) []*Client {
clients := make([]*Client, 0, len(s.clients))
clientUsed := make([]bool, len(s.clients))
clientNames := make([]string, 0, len(s.clients))
domainRules := []string{}
// Priority domain matching
for _, match := range s.domainMatcher.Match(domain) {
info := s.matcherInfos[match]
client := s.clients[info.clientIdx]
domainRule := client.domains[info.domainRuleIdx]
domainRules = append(domainRules, fmt.Sprintf("%s(DNS idx:%d)", domainRule, info.clientIdx))
if clientUsed[info.clientIdx] {
continue
}
clientUsed[info.clientIdx] = true
clients = append(clients, client)
clientNames = append(clientNames, client.Name())
}
// Default round-robin query
for idx, client := range s.clients {
if clientUsed[idx] {
continue
}
clientUsed[idx] = true
clients = append(clients, client)
clientNames = append(clientNames, client.Name())
}
if len(domainRules) > 0 {
newError("domain ", domain, " matches following rules: ", domainRules).AtDebug().WriteToLog()
}
if len(clientNames) > 0 {
newError("domain ", domain, " will use DNS in order: ", clientNames).AtDebug().WriteToLog()
}
return clients
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
}

0
app/dns/server_test.go → app/dns/dns_test.go
View file

57
app/dns/hosts.go
View file

@ -14,25 +14,6 @@ type StaticHosts struct {
matchers *strmatcher.MatcherGroup
}
var typeMap = map[DomainMatchingType]strmatcher.Type{
DomainMatchingType_Full: strmatcher.Full,
DomainMatchingType_Subdomain: strmatcher.Domain,
DomainMatchingType_Keyword: strmatcher.Substr,
DomainMatchingType_Regex: strmatcher.Regex,
}
func toStrMatcher(t DomainMatchingType, domain string) (strmatcher.Matcher, error) {
strMType, f := typeMap[t]
if !f {
return nil, newError("unknown mapping type", t).AtWarning()
}
matcher, err := strMType.New(domain)
if err != nil {
return nil, newError("failed to create str matcher").Base(err)
}
return matcher, nil
}
// NewStaticHosts creates a new StaticHosts instance.
func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDomain) (*StaticHosts, error) {
g := new(strmatcher.MatcherGroup)
@ -100,24 +81,38 @@ func filterIP(ips []net.Address, option dns.IPOption) []net.Address {
filtered = append(filtered, ip)
}
}
if len(filtered) == 0 {
return nil
}
return filtered
}
// LookupIP returns IP address for the given domain, if exists in this StaticHosts.
func (h *StaticHosts) LookupIP(domain string, option dns.IPOption) []net.Address {
indices := h.matchers.Match(domain)
if len(indices) == 0 {
return nil
}
ips := []net.Address{}
for _, id := range indices {
func (h *StaticHosts) lookupInternal(domain string) []net.Address {
var ips []net.Address
for _, id := range h.matchers.Match(domain) {
ips = append(ips, h.ips[id]...)
}
if len(ips) == 1 && ips[0].Family().IsDomain() {
return ips
}
return filterIP(ips, option)
return ips
}
func (h *StaticHosts) lookup(domain string, option dns.IPOption, maxDepth int) []net.Address {
switch addrs := h.lookupInternal(domain); {
case len(addrs) == 0: // Not recorded in static hosts, return nil
return nil
case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Try to unwrap domain
if maxDepth > 0 {
unwrapped := h.lookup(addrs[0].Domain(), option, maxDepth-1)
if unwrapped != nil {
return unwrapped
}
}
return addrs
default: // IP record found, return a non-nil IP array
return filterIP(addrs, option)
}
}
// Lookup returns IP addresses or proxied domain for the given domain, if exists in this StaticHosts.
func (h *StaticHosts) Lookup(domain string, option dns.IPOption) []net.Address {
return h.lookup(domain, option, 5)
}

6
app/dns/hosts_test.go
View file

@ -40,7 +40,7 @@ func TestStaticHosts(t *testing.T) {
common.Must(err)
{
ips := hosts.LookupIP("example.com", dns.IPOption{
ips := hosts.Lookup("example.com", dns.IPOption{
IPv4Enable: true,
IPv6Enable: true,
})
@ -53,7 +53,7 @@ func TestStaticHosts(t *testing.T) {
}
{
ips := hosts.LookupIP("www.example.cn", dns.IPOption{
ips := hosts.Lookup("www.example.cn", dns.IPOption{
IPv4Enable: true,
IPv6Enable: true,
})
@ -66,7 +66,7 @@ func TestStaticHosts(t *testing.T) {
}
{
ips := hosts.LookupIP("baidu.com", dns.IPOption{
ips := hosts.Lookup("baidu.com", dns.IPOption{
IPv4Enable: false,
IPv6Enable: true,
})

203
app/dns/nameserver.go
View file

@ -2,40 +2,209 @@ package dns
import (
"context"
"net/url"
"strings"
"time"
"github.com/xtls/xray-core/app/router"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/strmatcher"
core "github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/features/dns/localdns"
"github.com/xtls/xray-core/features/routing"
)
// Client is the interface for DNS client.
type Client interface {
// Server is the interface for Name Server.
type Server interface {
// Name of the Client.
Name() string
// QueryIP sends IP queries to its configured server.
QueryIP(ctx context.Context, domain string, option dns.IPOption) ([]net.IP, error)
QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns.IPOption, disableCache bool) ([]net.IP, error)
}
type LocalNameServer struct {
client *localdns.Client
// Client is the interface for DNS client.
type Client struct {
server Server
clientIP net.IP
domains []string
expectIPs []*router.GeoIPMatcher
}
func (s *LocalNameServer) QueryIP(_ context.Context, domain string, option dns.IPOption) ([]net.IP, error) {
if option.IPv4Enable || option.IPv6Enable {
return s.client.LookupIP(domain, option)
var errExpectedIPNonMatch = errors.New("expectIPs not match")
// NewServer creates a name server object according to the network destination url.
func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, error) {
if address := dest.Address; address.Family().IsDomain() {
u, err := url.Parse(address.Domain())
if err != nil {
return nil, err
}
switch {
case strings.EqualFold(u.String(), "localhost"):
return NewLocalNameServer(), nil
case strings.EqualFold(u.Scheme, "https"): // DOH Remote mode
return NewDoHNameServer(u, dispatcher)
case strings.EqualFold(u.Scheme, "https+local"): // DOH Local mode
return NewDoHLocalNameServer(u), nil
case strings.EqualFold(u.Scheme, "quic+local"): // DNS-over-QUIC Local mode
return NewQUICNameServer(u)
case strings.EqualFold(u.String(), "fakedns"):
return NewFakeDNSServer(), nil
}
}
if dest.Network == net.Network_Unknown {
dest.Network = net.Network_UDP
}
if dest.Network == net.Network_UDP { // UDP classic DNS mode
return NewClassicNameServer(dest, dispatcher), nil
}
return nil, newError("No available name server could be created from ", dest).AtWarning()
}
// NewClient creates a DNS client managing a name server with client IP, domain rules and expected IPs.
func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container router.GeoIPMatcherContainer, matcherInfos *[]DomainMatcherInfo, updateDomainRule func(strmatcher.Matcher, int, []DomainMatcherInfo) error) (*Client, error) {
client := &Client{}
err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
// Create a new server for each client for now
server, err := NewServer(ns.Address.AsDestination(), dispatcher)
if err != nil {
return newError("failed to create nameserver").Base(err).AtWarning()
}
// Priotize local domains with specific TLDs or without any dot to local DNS
if _, isLocalDNS := server.(*LocalNameServer); isLocalDNS {
ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
ns.OriginalRules = append(ns.OriginalRules, localTLDsAndDotlessDomainsRule)
// The following lines is a solution to avoid core panics（rule index out of range） when setting `localhost` DNS client in config.
// Because the `localhost` DNS client will apend len(localTLDsAndDotlessDomains) rules into matcherInfos to match `geosite:private` default rule.
// But `matcherInfos` has no enough length to add rules, which leads to core panics (rule index out of range).
// To avoid this, the length of `matcherInfos` must be equal to the expected, so manually append it with Golang default zero value first for later modification.
for i := 0; i < len(localTLDsAndDotlessDomains); i++ {
*matcherInfos = append(*matcherInfos, DomainMatcherInfo{
clientIdx: uint16(0),
domainRuleIdx: uint16(0),
})
}
}
// Establish domain rules
var rules []string
ruleCurr := 0
ruleIter := 0
for _, domain := range ns.PrioritizedDomain {
domainRule, err := toStrMatcher(domain.Type, domain.Domain)
if err != nil {
return newError("failed to create prioritized domain").Base(err).AtWarning()
}
originalRuleIdx := ruleCurr
if ruleCurr < len(ns.OriginalRules) {
rule := ns.OriginalRules[ruleCurr]
if ruleCurr >= len(rules) {
rules = append(rules, rule.Rule)
}
ruleIter++
if ruleIter >= int(rule.Size) {
ruleIter = 0
ruleCurr++
}
} else { // No original rule, generate one according to current domain matcher (majorly for compatibility with tests)
rules = append(rules, domainRule.String())
ruleCurr++
}
err = updateDomainRule(domainRule, originalRuleIdx, *matcherInfos)
if err != nil {
return newError("failed to create prioritized domain").Base(err).AtWarning()
}
}
// Establish expected IPs
var matchers []*router.GeoIPMatcher
for _, geoip := range ns.Geoip {
matcher, err := container.Add(geoip)
if err != nil {
return newError("failed to create ip matcher").Base(err).AtWarning()
}
matchers = append(matchers, matcher)
}
if len(clientIP) > 0 {
switch ns.Address.Address.GetAddress().(type) {
case *net.IPOrDomain_Domain:
newError("DNS: client ", ns.Address.Address.GetDomain(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
case *net.IPOrDomain_Ip:
newError("DNS: client ", ns.Address.Address.GetIp(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
}
}
client.server = server
client.clientIP = clientIP
client.domains = rules
client.expectIPs = matchers
return nil
})
return client, err
}
// NewSimpleClient creates a DNS client with a simple destination.
func NewSimpleClient(ctx context.Context, endpoint *net.Endpoint, clientIP net.IP) (*Client, error) {
client := &Client{}
err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
server, err := NewServer(endpoint.AsDestination(), dispatcher)
if err != nil {
return newError("failed to create nameserver").Base(err).AtWarning()
}
client.server = server
client.clientIP = clientIP
return nil
})
if len(clientIP) > 0 {
switch endpoint.Address.GetAddress().(type) {
case *net.IPOrDomain_Domain:
newError("DNS: client ", endpoint.Address.GetDomain(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
case *net.IPOrDomain_Ip:
newError("DNS: client ", endpoint.Address.GetIp(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
}
}
return nil, newError("neither IPv4 nor IPv6 is enabled")
return client, err
}
func (s *LocalNameServer) Name() string {
return "localhost"
// Name returns the server name the client manages.
func (c *Client) Name() string {
return c.server.Name()
}
func NewLocalNameServer() *LocalNameServer {
newError("DNS: created localhost client").AtInfo().WriteToLog()
return &LocalNameServer{
client: localdns.New(),
// QueryIP send DNS query to the name server with the client's IP.
func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption, disableCache bool) ([]net.IP, error) {
ctx, cancel := context.WithTimeout(ctx, 4*time.Second)
ips, err := c.server.QueryIP(ctx, domain, c.clientIP, option, disableCache)
cancel()
if err != nil {
return ips, err
}
return c.MatchExpectedIPs(domain, ips)
}
// MatchExpectedIPs matches queried domain IPs with expected IPs and returns matched ones.
func (c *Client) MatchExpectedIPs(domain string, ips []net.IP) ([]net.IP, error) {
if len(c.expectIPs) == 0 {
return ips, nil
}
newIps := []net.IP{}
for _, ip := range ips {
for _, matcher := range c.expectIPs {
if matcher.Match(ip) {
newIps = append(newIps, ip)
break
}
}
}
if len(newIps) == 0 {
return nil, errExpectedIPNonMatch
}
newError("domain ", domain, " expectIPs ", newIps, " matched at server ", c.Name()).AtDebug().WriteToLog()
return newIps, nil
}

52
app/dns/dohdns.go → app/dns/nameserver_doh.go
View file

@ -42,10 +42,10 @@ type DoHNameServer struct {
name string
}
// NewDoHNameServer creates DOH client object for remote resolving
func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.IP) (*DoHNameServer, error) {
// NewDoHNameServer creates DOH server object for remote resolving
func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher) (*DoHNameServer, error) {
newError("DNS: created Remote DOH client for ", url.String()).AtInfo().WriteToLog()
s := baseDOHNameServer(url, "DOH", clientIP)
s := baseDOHNameServer(url, "DOH")
s.dispatcher = dispatcher
tr := &http.Transport{
@ -104,9 +104,9 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.
}
// NewDoHLocalNameServer creates DOH client object for local resolving
func NewDoHLocalNameServer(url *url.URL, clientIP net.IP) *DoHNameServer {
func NewDoHLocalNameServer(url *url.URL) *DoHNameServer {
url.Scheme = "https"
s := baseDOHNameServer(url, "DOHL", clientIP)
s := baseDOHNameServer(url, "DOHL")
tr := &http.Transport{
IdleConnTimeout: 90 * time.Second,
ForceAttemptHTTP2: true,
@ -136,13 +136,12 @@ func NewDoHLocalNameServer(url *url.URL, clientIP net.IP) *DoHNameServer {
return s
}
func baseDOHNameServer(url *url.URL, prefix string, clientIP net.IP) *DoHNameServer {
func baseDOHNameServer(url *url.URL, prefix string) *DoHNameServer {
s := &DoHNameServer{
ips: make(map[string]record),
clientIP: clientIP,
pub: pubsub.NewService(),
name: prefix + "//" + url.Host,
dohURL: url.String(),
ips: make(map[string]record),
pub: pubsub.NewService(),
name: prefix + "//" + url.Host,
dohURL: url.String(),
}
s.cleanup = &task.Periodic{
Interval: time.Minute,
@ -152,7 +151,7 @@ func baseDOHNameServer(url *url.URL, prefix string, clientIP net.IP) *DoHNameSer
return s
}
// Name returns client name
// Name implements Server.
func (s *DoHNameServer) Name() string {
return s.name
}
@ -235,7 +234,7 @@ func (s *DoHNameServer) newReqID() uint16 {
return uint16(atomic.AddUint32(&s.reqID, 1))
}
func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option dns_feature.IPOption) {
func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption) {
newError(s.name, " querying: ", domain).AtInfo().WriteToLog(session.ExportIDToError(ctx))
if s.name+"." == "DOH//"+domain {
@ -243,7 +242,7 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option dns
return
}
reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP))
reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
var deadline time.Time
if d, ok := ctx.Deadline(); ok {
@ -264,8 +263,8 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option dns
}
dnsCtx = session.ContextWithContent(dnsCtx, &session.Content{
Protocol: "https",
//SkipRoutePick: true,
Protocol: "https",
SkipDNSResolve: true,
})
// forced to use mux for DOH
@ -349,7 +348,7 @@ func (s *DoHNameServer) findIPsForDomain(domain string, option dns_feature.IPOpt
}
if len(ips) > 0 {
return toNetIP(ips), nil
return toNetIP(ips)
}
if lastErr != nil {
@ -363,15 +362,18 @@ func (s *DoHNameServer) findIPsForDomain(domain string, option dns_feature.IPOpt
return nil, errRecordNotFound
}
// QueryIP is called from dns.Server->queryIPTimeout
func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, error) { // nolint: dupl
// QueryIP implements Server.
func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, disableCache bool) ([]net.IP, error) { // nolint: dupl
fqdn := Fqdn(domain)
ips, err := s.findIPsForDomain(fqdn, option)
if err != errRecordNotFound {
newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
log.Record(&log.DNSLog{s.name, domain, ips, log.DNSCacheHit, 0, err})
return ips, err
if disableCache {
newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
} else {
ips, err := s.findIPsForDomain(fqdn, option)
if err != errRecordNotFound {
newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
return ips, err
}
}
// ipv4 and ipv6 belong to different subscription groups
@ -400,7 +402,7 @@ func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option dns_f
}
close(done)
}()
s.sendQuery(ctx, fqdn, option)
s.sendQuery(ctx, fqdn, clientIP, option)
start := time.Now()
for {

60
app/dns/nameserver_doh_test.go Normal file
View file

@ -0,0 +1,60 @@
package dns_test
import (
"context"
"net/url"
"testing"
"time"
"github.com/google/go-cmp/cmp"
. "github.com/xtls/xray-core/app/dns"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/net"
dns_feature "github.com/xtls/xray-core/features/dns"
)
func TestDOHNameServer(t *testing.T) {
url, err := url.Parse("https+local://1.1.1.1/dns-query")
common.Must(err)
s := NewDoHLocalNameServer(url)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
IPv4Enable: true,
IPv6Enable: true,
}, false)
cancel()
common.Must(err)
if len(ips) == 0 {
t.Error("expect some ips, but got 0")
}
}
func TestDOHNameServerWithCache(t *testing.T) {
url, err := url.Parse("https+local://1.1.1.1/dns-query")
common.Must(err)
s := NewDoHLocalNameServer(url)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
IPv4Enable: true,
IPv6Enable: true,
}, false)
cancel()
common.Must(err)
if len(ips) == 0 {
t.Error("expect some ips, but got 0")
}
ctx2, cancel := context.WithTimeout(context.Background(), time.Second*2)
ips2, err := s.QueryIP(ctx2, "google.com", net.IP(nil), dns_feature.IPOption{
IPv4Enable: true,
IPv6Enable: true,
}, true)
cancel()
common.Must(err)
if r := cmp.Diff(ips2, ips); r != "" {
t.Fatal(r)
}
}

8
app/dns/nameserver_fakedns.go
View file

@ -20,7 +20,7 @@ func (FakeDNSServer) Name() string {
return "FakeDNS"
}
func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ dns.IPOption) ([]net.IP, error) {
func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ net.IP, _ dns.IPOption, _ bool) ([]net.IP, error) {
if f.fakeDNSEngine == nil {
if err := core.RequireFeatures(ctx, func(fd dns.FakeDNSEngine) {
f.fakeDNSEngine = fd
@ -30,9 +30,9 @@ func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ dns.IPOpti
}
ips := f.fakeDNSEngine.GetFakeIPForDomain(domain)
netIP := toNetIP(ips)
if netIP == nil {
return nil, newError("Unable to convert IP to net ip").AtError()
netIP, err := toNetIP(ips)
if err != nil {
return nil, newError("Unable to convert IP to net ip").Base(err).AtError()
}
newError(f.Name(), " got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()

41
app/dns/nameserver_local.go Normal file
View file

@ -0,0 +1,41 @@
package dns
import (
"context"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/features/dns/localdns"
)
// LocalNameServer is an wrapper over local DNS feature.
type LocalNameServer struct {
client *localdns.Client
}
// QueryIP implements Server.
func (s *LocalNameServer) QueryIP(_ context.Context, domain string, _ net.IP, option dns.IPOption, _ bool) ([]net.IP, error) {
if option.IPv4Enable || option.IPv6Enable {
return s.client.LookupIP(domain, option)
}
return nil, newError("neither IPv4 nor IPv6 is enabled")
}
// Name implements Server.
func (s *LocalNameServer) Name() string {
return "localhost"
}
// NewLocalNameServer creates localdns server object for directly lookup in system DNS.
func NewLocalNameServer() *LocalNameServer {
newError("DNS: created localhost client").AtInfo().WriteToLog()
return &LocalNameServer{
client: localdns.New(),
}
}
// NewLocalDNSClient creates localdns client object for directly lookup in system DNS.
func NewLocalDNSClient() *Client {
return &Client{server: NewLocalNameServer()}
}

8
app/dns/nameserver_test.go → app/dns/nameserver_local_test.go
View file

@ -7,17 +7,17 @@ import (
. "github.com/xtls/xray-core/app/dns"
"github.com/xtls/xray-core/common"
dns_feature "github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/features/dns"
)
func TestLocalNameServer(t *testing.T) {
s := NewLocalNameServer()
ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
ips, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
ips, err := s.QueryIP(ctx, "google.com", net.IP{}, dns.IPOption{
IPv4Enable: true,
IPv6Enable: true,
FakeEnable: false,
})
}, false)
cancel()
common.Must(err)
if len(ips) == 0 {

387
app/dns/nameserver_quic.go Normal file
View file

@ -0,0 +1,387 @@
package dns
import (
"context"
"net/url"
"sync"
"sync/atomic"
"time"
"github.com/lucas-clemente/quic-go"
"golang.org/x/net/dns/dnsmessage"
"golang.org/x/net/http2"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol/dns"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal/pubsub"
"github.com/xtls/xray-core/common/task"
dns_feature "github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/transport/internet/tls"
)
// NextProtoDQ - During connection establishment, DNS/QUIC support is indicated
// by selecting the ALPN token "dq" in the crypto handshake.
const NextProtoDQ = "doq-i00"
const handshakeTimeout = time.Second * 8
// QUICNameServer implemented DNS over QUIC
type QUICNameServer struct {
sync.RWMutex
ips map[string]record
pub *pubsub.Service
cleanup *task.Periodic
reqID uint32
name string
destination net.Destination
session quic.Session
}
// NewQUICNameServer creates DNS-over-QUIC client object for local resolving
func NewQUICNameServer(url *url.URL) (*QUICNameServer, error) {
newError("DNS: created Local DNS-over-QUIC client for ", url.String()).AtInfo().WriteToLog()
var err error
port := net.Port(784)
if url.Port() != "" {
port, err = net.PortFromString(url.Port())
if err != nil {
return nil, err
}
}
dest := net.UDPDestination(net.DomainAddress(url.Hostname()), port)
s := &QUICNameServer{
ips: make(map[string]record),
pub: pubsub.NewService(),
name: url.String(),
destination: dest,
}
s.cleanup = &task.Periodic{
Interval: time.Minute,
Execute: s.Cleanup,
}
return s, nil
}
// Name returns client name
func (s *QUICNameServer) Name() string {
return s.name
}
// Cleanup clears expired items from cache
func (s *QUICNameServer) Cleanup() error {
now := time.Now()
s.Lock()
defer s.Unlock()
if len(s.ips) == 0 {
return newError("nothing to do. stopping...")
}
for domain, record := range s.ips {
if record.A != nil && record.A.Expire.Before(now) {
record.A = nil
}
if record.AAAA != nil && record.AAAA.Expire.Before(now) {
record.AAAA = nil
}
if record.A == nil && record.AAAA == nil {
newError(s.name, " cleanup ", domain).AtDebug().WriteToLog()
delete(s.ips, domain)
} else {
s.ips[domain] = record
}
}
if len(s.ips) == 0 {
s.ips = make(map[string]record)
}
return nil
}
func (s *QUICNameServer) updateIP(req *dnsRequest, ipRec *IPRecord) {
elapsed := time.Since(req.start)
s.Lock()
rec := s.ips[req.domain]
updated := false
switch req.reqType {
case dnsmessage.TypeA:
if isNewer(rec.A, ipRec) {
rec.A = ipRec
updated = true
}
case dnsmessage.TypeAAAA:
addr := make([]net.Address, 0)
for _, ip := range ipRec.IP {
if len(ip.IP()) == net.IPv6len {
addr = append(addr, ip)
}
}
ipRec.IP = addr
if isNewer(rec.AAAA, ipRec) {
rec.AAAA = ipRec
updated = true
}
}
newError(s.name, " got answer: ", req.domain, " ", req.reqType, " -> ", ipRec.IP, " ", elapsed).AtInfo().WriteToLog()
if updated {
s.ips[req.domain] = rec
}
switch req.reqType {
case dnsmessage.TypeA:
s.pub.Publish(req.domain+"4", nil)
case dnsmessage.TypeAAAA:
s.pub.Publish(req.domain+"6", nil)
}
s.Unlock()
common.Must(s.cleanup.Start())
}
func (s *QUICNameServer) newReqID() uint16 {
return uint16(atomic.AddUint32(&s.reqID, 1))
}
func (s *QUICNameServer) sendQuery(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption) {
newError(s.name, " querying: ", domain).AtInfo().WriteToLog(session.ExportIDToError(ctx))
reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
var deadline time.Time
if d, ok := ctx.Deadline(); ok {
deadline = d
} else {
deadline = time.Now().Add(time.Second * 5)
}
for _, req := range reqs {
go func(r *dnsRequest) {
// generate new context for each req, using same context
// may cause reqs all aborted if any one encounter an error
dnsCtx := context.Background()
// reserve internal dns server requested Inbound
if inbound := session.InboundFromContext(ctx); inbound != nil {
dnsCtx = session.ContextWithInbound(dnsCtx, inbound)
}
dnsCtx = session.ContextWithContent(dnsCtx, &session.Content{
Protocol: "quic",
SkipDNSResolve: true,
})
var cancel context.CancelFunc
dnsCtx, cancel = context.WithDeadline(dnsCtx, deadline)
defer cancel()
b, err := dns.PackMessage(r.msg)
if err != nil {
newError("failed to pack dns query").Base(err).AtError().WriteToLog()
return
}
conn, err := s.openStream(dnsCtx)
if err != nil {
newError("failed to open quic session").Base(err).AtError().WriteToLog()
return
}
_, err = conn.Write(b.Bytes())
if err != nil {
newError("failed to send query").Base(err).AtError().WriteToLog()
return
}
_ = conn.Close()
respBuf := buf.New()
defer respBuf.Release()
n, err := respBuf.ReadFrom(conn)
if err != nil && n == 0 {
newError("failed to read response").Base(err).AtError().WriteToLog()
return
}
rec, err := parseResponse(respBuf.Bytes())
if err != nil {
newError("failed to handle response").Base(err).AtError().WriteToLog()
return
}
s.updateIP(r, rec)
}(req)
}
}
func (s *QUICNameServer) findIPsForDomain(domain string, option dns_feature.IPOption) ([]net.IP, error) {
s.RLock()
record, found := s.ips[domain]
s.RUnlock()
if !found {
return nil, errRecordNotFound
}
var ips []net.Address
var lastErr error
if option.IPv6Enable && record.AAAA != nil && record.AAAA.RCode == dnsmessage.RCodeSuccess {
aaaa, err := record.AAAA.getIPs()
if err != nil {
lastErr = err
}
ips = append(ips, aaaa...)
}
if option.IPv4Enable && record.A != nil && record.A.RCode == dnsmessage.RCodeSuccess {
a, err := record.A.getIPs()
if err != nil {
lastErr = err
}
ips = append(ips, a...)
}
if len(ips) > 0 {
return toNetIP(ips)
}
if lastErr != nil {
return nil, lastErr
}
if (option.IPv4Enable && record.A != nil) || (option.IPv6Enable && record.AAAA != nil) {
return nil, dns_feature.ErrEmptyResponse
}
return nil, errRecordNotFound
}
// QueryIP is called from dns.Server->queryIPTimeout
func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, disableCache bool) ([]net.IP, error) {
fqdn := Fqdn(domain)
if disableCache {
newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
} else {
ips, err := s.findIPsForDomain(fqdn, option)
if err != errRecordNotFound {
newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
return ips, err
}
}
// ipv4 and ipv6 belong to different subscription groups
var sub4, sub6 *pubsub.Subscriber
if option.IPv4Enable {
sub4 = s.pub.Subscribe(fqdn + "4")
defer sub4.Close()
}
if option.IPv6Enable {
sub6 = s.pub.Subscribe(fqdn + "6")
defer sub6.Close()
}
done := make(chan interface{})
go func() {
if sub4 != nil {
select {
case <-sub4.Wait():
case <-ctx.Done():
}
}
if sub6 != nil {
select {
case <-sub6.Wait():
case <-ctx.Done():
}
}
close(done)
}()
s.sendQuery(ctx, fqdn, clientIP, option)
for {
ips, err := s.findIPsForDomain(fqdn, option)
if err != errRecordNotFound {
return ips, err
}
select {
case <-ctx.Done():
return nil, ctx.Err()
case <-done:
}
}
}
func isActive(s quic.Session) bool {
select {
case <-s.Context().Done():
return false
default:
return true
}
}
func (s *QUICNameServer) getSession() (quic.Session, error) {
var session quic.Session
s.RLock()
session = s.session
if session != nil && isActive(session) {
s.RUnlock()
return session, nil
}
if session != nil {
// we're recreating the session, let's create a new one
_ = session.CloseWithError(0, "")
}
s.RUnlock()
s.Lock()
defer s.Unlock()
var err error
session, err = s.openSession()
if err != nil {
// This does not look too nice, but QUIC (or maybe quic-go)
// doesn't seem stable enough.
// Maybe retransmissions aren't fully implemented in quic-go?
// Anyways, the simple solution is to make a second try when
// it fails to open the QUIC session.
session, err = s.openSession()
if err != nil {
return nil, err
}
}
s.session = session
return session, nil
}
func (s *QUICNameServer) openSession() (quic.Session, error) {
tlsConfig := tls.Config{}
quicConfig := &quic.Config{
HandshakeTimeout: handshakeTimeout,
}
session, err := quic.DialAddrContext(context.Background(), s.destination.NetAddr(), tlsConfig.GetTLSConfig(tls.WithNextProto("http/1.1", http2.NextProtoTLS, NextProtoDQ)), quicConfig)
if err != nil {
return nil, err
}
return session, nil
}
func (s *QUICNameServer) openStream(ctx context.Context) (quic.Stream, error) {
session, err := s.getSession()
if err != nil {
return nil, err
}
// open a new stream
return session.OpenStreamSync(ctx)
}

60
app/dns/nameserver_quic_test.go Normal file
View file

@ -0,0 +1,60 @@
package dns_test
import (
"context"
"net/url"
"testing"
"time"
"github.com/google/go-cmp/cmp"
. "github.com/xtls/xray-core/app/dns"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/net"
dns_feature "github.com/xtls/xray-core/features/dns"
)
func TestQUICNameServer(t *testing.T) {
url, err := url.Parse("quic://dns.adguard.com")
common.Must(err)
s, err := NewQUICNameServer(url)
common.Must(err)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
IPv4Enable: true,
IPv6Enable: true,
}, false)
cancel()
common.Must(err)
if len(ips) == 0 {
t.Error("expect some ips, but got 0")
}
}
func TestQUICNameServerWithCache(t *testing.T) {
url, err := url.Parse("quic://dns.adguard.com")
common.Must(err)
s, err := NewQUICNameServer(url)
common.Must(err)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
IPv4Enable: true,
IPv6Enable: true,
}, false)
cancel()
common.Must(err)
if len(ips) == 0 {
t.Error("expect some ips, but got 0")
}
ctx2, cancel := context.WithTimeout(context.Background(), time.Second*2)
ips2, err := s.QueryIP(ctx2, "google.com", net.IP(nil), dns_feature.IPOption{
IPv4Enable: true,
IPv6Enable: true,
}, true)
cancel()
common.Must(err)
if r := cmp.Diff(ips2, ips); r != "" {
t.Fatal(r)
}
}

34
app/dns/udpns.go → app/dns/nameserver_udp.go
View file

@ -2,12 +2,13 @@ package dns
import (
"context"
"github.com/xtls/xray-core/transport/internet"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/log"
"github.com/xtls/xray-core/common/net"
@ -32,10 +33,10 @@ type ClassicNameServer struct {
udpServer *udp.Dispatcher
cleanup *task.Periodic
reqID uint32
clientIP net.IP
}
func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher, clientIP net.IP) *ClassicNameServer {
// NewClassicNameServer creates udp server object for remote resolving.
func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher) *ClassicNameServer {
// default to 53 if unspecific
if address.Port == 0 {
address.Port = net.Port(53)
@ -45,7 +46,6 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
address: address,
ips: make(map[string]record),
requests: make(map[uint16]dnsRequest),
clientIP: clientIP,
pub: pubsub.NewService(),
name: strings.ToUpper(address.String()),
}
@ -58,10 +58,12 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
return s
}
// Name implements Server.
func (s *ClassicNameServer) Name() string {
return s.name
}
// Cleanup clears expired items from cache
func (s *ClassicNameServer) Cleanup() error {
now := time.Now()
s.Lock()
@ -103,6 +105,7 @@ func (s *ClassicNameServer) Cleanup() error {
return nil
}
// HandleResponse handles udp response packet from remote DNS server.
func (s *ClassicNameServer) HandleResponse(ctx context.Context, packet *udp_proto.Packet) {
ipRec, err := parseResponse(packet.Payload.Bytes())
if err != nil {
@ -180,10 +183,10 @@ func (s *ClassicNameServer) addPendingRequest(req *dnsRequest) {
s.requests[id] = *req
}
func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, option dns_feature.IPOption) {
func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption) {
newError(s.name, " querying DNS for: ", domain).AtDebug().WriteToLog(session.ExportIDToError(ctx))
reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP))
reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
for _, req := range reqs {
s.addPendingRequest(req)
@ -234,7 +237,7 @@ func (s *ClassicNameServer) findIPsForDomain(domain string, option dns_feature.I
}
if len(ips) > 0 {
return toNetIP(ips), nil
return toNetIP(ips)
}
if lastErr != nil {
@ -245,14 +248,17 @@ func (s *ClassicNameServer) findIPsForDomain(domain string, option dns_feature.I
}
// QueryIP implements Server.
func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, error) {
func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, disableCache bool) ([]net.IP, error) {
fqdn := Fqdn(domain)
ips, err := s.findIPsForDomain(fqdn, option)
if err != errRecordNotFound {
newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
log.Record(&log.DNSLog{s.name, domain, ips, log.DNSCacheHit, 0, err})
return ips, err
if disableCache {
newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
} else {
ips, err := s.findIPsForDomain(fqdn, option)
if err != errRecordNotFound {
newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
return ips, err
}
}
// ipv4 and ipv6 belong to different subscription groups
@ -281,7 +287,7 @@ func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, option d
}
close(done)
}()
s.sendQuery(ctx, fqdn, option)
s.sendQuery(ctx, fqdn, clientIP, option)
start := time.Now()
for {

439
app/dns/server.go
View file

@ -1,439 +0,0 @@
package dns
//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
import (
"context"
"fmt"
"log"
"net/url"
"strings"
"sync"
"time"
"github.com/xtls/xray-core/app/router"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/strmatcher"
"github.com/xtls/xray-core/common/uuid"
core "github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features"
"github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/features/routing"
"github.com/xtls/xray-core/transport/internet"
)
// Server is a DNS rely server.
type Server struct {
sync.Mutex
hosts *StaticHosts
clientIP net.IP
clients []Client // clientIdx -> Client
ctx context.Context
ipIndexMap []*MultiGeoIPMatcher // clientIdx -> *MultiGeoIPMatcher
domainRules [][]string // clientIdx -> domainRuleIdx -> DomainRule
domainMatcher strmatcher.IndexMatcher
matcherInfos []DomainMatcherInfo // matcherIdx -> DomainMatcherInfo
tag string
}
// DomainMatcherInfo contains information attached to index returned by Server.domainMatcher
type DomainMatcherInfo struct {
clientIdx uint16
domainRuleIdx uint16
}
// MultiGeoIPMatcher for match
type MultiGeoIPMatcher struct {
matchers []*router.GeoIPMatcher
}
var errExpectedIPNonMatch = errors.New("expectIPs not match")
// Match check ip match
func (c *MultiGeoIPMatcher) Match(ip net.IP) bool {
for _, matcher := range c.matchers {
if matcher.Match(ip) {
return true
}
}
return false
}
// HasMatcher check has matcher
func (c *MultiGeoIPMatcher) HasMatcher() bool {
return len(c.matchers) > 0
}
func generateRandomTag() string {
id := uuid.New()
return "xray.system." + id.String()
}
// New creates a new DNS server with given configuration.
func New(ctx context.Context, config *Config) (*Server, error) {
server := &Server{
clients: make([]Client, 0, len(config.NameServers)+len(config.NameServer)),
ctx: ctx,
tag: config.Tag,
}
if server.tag == "" {
server.tag = generateRandomTag()
}
if len(config.ClientIp) > 0 {
if len(config.ClientIp) != net.IPv4len && len(config.ClientIp) != net.IPv6len {
return nil, newError("unexpected IP length", len(config.ClientIp))
}
server.clientIP = net.IP(config.ClientIp)
}
hosts, err := NewStaticHosts(config.StaticHosts, config.Hosts)
if err != nil {
return nil, newError("failed to create hosts").Base(err)
}
server.hosts = hosts
addNameServer := func(ns *NameServer) int {
endpoint := ns.Address
address := endpoint.Address.AsAddress()
switch {
case address.Family().IsDomain() && address.Domain() == "localhost":
server.clients = append(server.clients, NewLocalNameServer())
// Priotize local domains with specific TLDs or without any dot to local DNS
// References:
// https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
// https://unix.stackexchange.com/questions/92441/whats-the-difference-between-local-home-and-lan
localTLDsAndDotlessDomains := []*NameServer_PriorityDomain{
{Type: DomainMatchingType_Regex, Domain: "^[^.]+$"}, // This will only match domains without any dot
{Type: DomainMatchingType_Subdomain, Domain: "local"},
{Type: DomainMatchingType_Subdomain, Domain: "localdomain"},
{Type: DomainMatchingType_Subdomain, Domain: "localhost"},
{Type: DomainMatchingType_Subdomain, Domain: "lan"},
{Type: DomainMatchingType_Subdomain, Domain: "home.arpa"},
{Type: DomainMatchingType_Subdomain, Domain: "example"},
{Type: DomainMatchingType_Subdomain, Domain: "invalid"},
{Type: DomainMatchingType_Subdomain, Domain: "test"},
}
ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
case address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "https+local://"):
// URI schemed string treated as domain
// DOH Local mode
u, err := url.Parse(address.Domain())
if err != nil {
log.Fatalln(newError("DNS config error").Base(err))
}
server.clients = append(server.clients, NewDoHLocalNameServer(u, server.clientIP))
case address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "https://"):
// DOH Remote mode
u, err := url.Parse(address.Domain())
if err != nil {
log.Fatalln(newError("DNS config error").Base(err))
}
idx := len(server.clients)
server.clients = append(server.clients, nil)
// need the core dispatcher, register DOHClient at callback
common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
c, err := NewDoHNameServer(u, d, server.clientIP)
if err != nil {
log.Fatalln(newError("DNS config error").Base(err))
}
server.clients[idx] = c
}))
case address.Family().IsDomain() && address.Domain() == "fakedns":
server.clients = append(server.clients, NewFakeDNSServer())
default:
// UDP classic DNS mode
dest := endpoint.AsDestination()
if dest.Network == net.Network_Unknown {
dest.Network = net.Network_UDP
}
if dest.Network == net.Network_UDP {
idx := len(server.clients)
server.clients = append(server.clients, nil)
common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
server.clients[idx] = NewClassicNameServer(dest, d, server.clientIP)
}))
}
}
server.ipIndexMap = append(server.ipIndexMap, nil)
return len(server.clients) - 1
}
if len(config.NameServers) > 0 {
features.PrintDeprecatedFeatureWarning("simple DNS server")
for _, destPB := range config.NameServers {
addNameServer(&NameServer{Address: destPB})
}
}
if len(config.NameServer) > 0 {
clientIndices := []int{}
domainRuleCount := 0
for _, ns := range config.NameServer {
idx := addNameServer(ns)
clientIndices = append(clientIndices, idx)
domainRuleCount += len(ns.PrioritizedDomain)
}
domainRules := make([][]string, len(server.clients))
domainMatcher := &strmatcher.MatcherGroup{}
matcherInfos := make([]DomainMatcherInfo, domainRuleCount+1) // matcher index starts from 1
var geoIPMatcherContainer router.GeoIPMatcherContainer
for nidx, ns := range config.NameServer {
idx := clientIndices[nidx]
// Establish domain rule matcher
rules := []string{}
ruleCurr := 0
ruleIter := 0
for _, domain := range ns.PrioritizedDomain {
matcher, err := toStrMatcher(domain.Type, domain.Domain)
if err != nil {
return nil, newError("failed to create prioritized domain").Base(err).AtWarning()
}
midx := domainMatcher.Add(matcher)
if midx >= uint32(len(matcherInfos)) { // This rarely happens according to current matcher's implementation
newError("expanding domain matcher info array to size ", midx, " when adding ", matcher).AtDebug().WriteToLog()
matcherInfos = append(matcherInfos, make([]DomainMatcherInfo, midx-uint32(len(matcherInfos))+1)...)
}
info := &matcherInfos[midx]
info.clientIdx = uint16(idx)
if ruleCurr < len(ns.OriginalRules) {
info.domainRuleIdx = uint16(ruleCurr)
rule := ns.OriginalRules[ruleCurr]
if ruleCurr >= len(rules) {
rules = append(rules, rule.Rule)
}
ruleIter++
if ruleIter >= int(rule.Size) {
ruleIter = 0
ruleCurr++
}
} else { // No original rule, generate one according to current domain matcher (majorly for compatibility with tests)
info.domainRuleIdx = uint16(len(rules))
rules = append(rules, matcher.String())
}
}
domainRules[idx] = rules
// only add to ipIndexMap if GeoIP is configured
if len(ns.Geoip) > 0 {
var matchers []*router.GeoIPMatcher
for _, geoip := range ns.Geoip {
matcher, err := geoIPMatcherContainer.Add(geoip)
if err != nil {
return nil, newError("failed to create ip matcher").Base(err).AtWarning()
}
matchers = append(matchers, matcher)
}
matcher := &MultiGeoIPMatcher{matchers: matchers}
server.ipIndexMap[idx] = matcher
}
}
server.domainRules = domainRules
server.domainMatcher = domainMatcher
server.matcherInfos = matcherInfos
}
if len(server.clients) == 0 {
server.clients = append(server.clients, NewLocalNameServer())
server.ipIndexMap = append(server.ipIndexMap, nil)
}
return server, nil
}
// Type implements common.HasType.
func (*Server) Type() interface{} {
return dns.ClientType()
}
// Start implements common.Runnable.
func (s *Server) Start() error {
return nil
}
// Close implements common.Closable.
func (s *Server) Close() error {
return nil
}
func (s *Server) IsOwnLink(ctx context.Context) bool {
inbound := session.InboundFromContext(ctx)
return inbound != nil && inbound.Tag == s.tag
}
// Match check dns ip match geoip
func (s *Server) Match(idx int, client Client, domain string, ips []net.IP) ([]net.IP, error) {
var matcher *MultiGeoIPMatcher
if idx < len(s.ipIndexMap) {
matcher = s.ipIndexMap[idx]
}
if matcher == nil {
return ips, nil
}
if !matcher.HasMatcher() {
newError("domain ", domain, " server has no valid matcher: ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
return ips, nil
}
newIps := []net.IP{}
for _, ip := range ips {
if matcher.Match(ip) {
newIps = append(newIps, ip)
}
}
if len(newIps) == 0 {
return nil, errExpectedIPNonMatch
}
newError("domain ", domain, " expectIPs ", newIps, " matched at server ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
return newIps, nil
}
func (s *Server) queryIPTimeout(idx int, client Client, domain string, option dns.IPOption) ([]net.IP, error) {
ctx, cancel := context.WithTimeout(s.ctx, time.Second*4)
if len(s.tag) > 0 {
ctx = session.ContextWithInbound(ctx, &session.Inbound{
Tag: s.tag,
})
}
ctx = internet.ContextWithLookupDomain(ctx, domain)
ips, err := client.QueryIP(ctx, domain, option)
cancel()
if err != nil {
return ips, err
}
ips, err = s.Match(idx, client, domain, ips)
return ips, err
}
func (s *Server) lookupStatic(domain string, option dns.IPOption, depth int32) []net.Address {
ips := s.hosts.LookupIP(domain, option)
if ips == nil {
return nil
}
if ips[0].Family().IsDomain() && depth < 5 {
if newIPs := s.lookupStatic(ips[0].Domain(), option, depth+1); newIPs != nil {
return newIPs
}
}
return ips
}
func toNetIP(ips []net.Address) []net.IP {
if len(ips) == 0 {
return nil
}
netips := make([]net.IP, 0, len(ips))
for _, ip := range ips {
netips = append(netips, ip.IP())
}
return netips
}
// LookupIP implements dns.Client.
func (s *Server) LookupIP(domain string, option dns.IPOption) ([]net.IP, error) {
if domain == "" {
return nil, newError("empty domain name")
}
domain = strings.ToLower(domain)
// normalize the FQDN form query
if strings.HasSuffix(domain, ".") {
domain = domain[:len(domain)-1]
}
ips := s.lookupStatic(domain, option, 0)
if ips != nil && ips[0].Family().IsIP() {
newError("returning ", len(ips), " IPs for domain ", domain).WriteToLog()
return toNetIP(ips), nil
}
if ips != nil && ips[0].Family().IsDomain() {
newdomain := ips[0].Domain()
newError("domain replaced: ", domain, " -> ", newdomain).WriteToLog()
domain = newdomain
}
var lastErr error
var matchedClient Client
if s.domainMatcher != nil {
indices := s.domainMatcher.Match(domain)
domainRules := []string{}
matchingDNS := []string{}
for _, idx := range indices {
info := s.matcherInfos[idx]
rule := s.domainRules[info.clientIdx][info.domainRuleIdx]
domainRules = append(domainRules, fmt.Sprintf("%s(DNS idx:%d)", rule, info.clientIdx))
matchingDNS = append(matchingDNS, s.clients[info.clientIdx].Name())
}
if len(domainRules) > 0 {
newError("domain ", domain, " matches following rules: ", domainRules).AtDebug().WriteToLog()
}
if len(matchingDNS) > 0 {
newError("domain ", domain, " uses following DNS first: ", matchingDNS).AtDebug().WriteToLog()
}
for _, idx := range indices {
clientIdx := int(s.matcherInfos[idx].clientIdx)
matchedClient = s.clients[clientIdx]
if !option.FakeEnable && strings.EqualFold(matchedClient.Name(), "FakeDNS") {
newError("skip DNS resolution for domain ", domain, " at server ", matchedClient.Name()).AtDebug().WriteToLog()
continue
}
ips, err := s.queryIPTimeout(clientIdx, matchedClient, domain, option)
if len(ips) > 0 {
return ips, nil
}
if err == dns.ErrEmptyResponse {
return nil, err
}
if err != nil {
newError("failed to lookup ip for domain ", domain, " at server ", matchedClient.Name()).Base(err).WriteToLog()
lastErr = err
}
}
}
for idx, client := range s.clients {
if client == matchedClient {
newError("domain ", domain, " at server ", client.Name(), " idx:", idx, " already lookup failed, just ignore").AtDebug().WriteToLog()
continue
}
if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
newError("skip DNS resolution for domain ", domain, " at server ", client.Name()).AtDebug().WriteToLog()
continue
}
ips, err := s.queryIPTimeout(idx, client, domain, option)
if len(ips) > 0 {
return ips, nil
}
if err != nil {
newError("failed to lookup ip for domain ", domain, " at server ", client.Name()).Base(err).WriteToLog()
lastErr = err
}
if err != context.Canceled && err != context.DeadlineExceeded && err != errExpectedIPNonMatch {
return nil, err
}
}
return nil, newError("returning nil for domain ", domain).Base(lastErr)
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
}

6
app/router/command/config.go
View file

@ -28,6 +28,12 @@ func (c routingContext) GetTargetPort() net.Port {
return net.Port(c.RoutingContext.GetTargetPort())
}
// GetSkipDNSResolve is a mock implementation here to match the interface,
// SkipDNSResolve is set from dns module, no use if coming from a protobuf object?
func (c routingContext) GetSkipDNSResolve() bool {
return false
}
// AsRoutingContext converts a protobuf RoutingContext into an implementation of routing.Context.
func AsRoutingContext(r *RoutingContext) routing.Context {
return routingContext{r}

10
app/router/router.go
View file

@ -80,7 +80,13 @@ func (r *Router) PickRoute(ctx routing.Context) (routing.Route, error) {
}
func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context, error) {
if r.domainStrategy == Config_IpOnDemand {
// SkipDNSResolve is set from DNS module.
// the DOH remote server maybe a domain name,
// this prevents cycle resolving dead loop
skipDNSResolve := ctx.GetSkipDNSResolve()
if r.domainStrategy == Config_IpOnDemand && !skipDNSResolve {
ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
}
@ -90,7 +96,7 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
}
}
if r.domainStrategy != Config_IpIfNonMatch || len(ctx.GetTargetDomain()) == 0 {
if r.domainStrategy != Config_IpIfNonMatch || len(ctx.GetTargetDomain()) == 0 || skipDNSResolve {
return nil, ctx, common.ErrNoClue
}

2
common/session/session.go
View file

@ -75,7 +75,7 @@ type Content struct {
Attributes map[string]string
SkipRoutePick bool
SkipDNSResolve bool
}
// Sockopt is the settings for socket connection.

3
features/routing/context.go
View file

@ -37,4 +37,7 @@ type Context interface {
// GetAttributes returns extra attributes from the conneciont content.
GetAttributes() map[string]string
// GetSkipDNSResolve returns a flag switch for weather skip dns resolve during route pick.
GetSkipDNSResolve() bool
}

8
features/routing/session/context.go
View file

@ -109,6 +109,14 @@ func (ctx *Context) GetAttributes() map[string]string {
return ctx.Content.Attributes
}
// GetSkipDNSResolve implements routing.Context.
func (ctx *Context) GetSkipDNSResolve() bool {
if ctx.Content == nil {
return false
}
return ctx.Content.SkipDNSResolve
}
// AsRoutingContext creates a context from context.context with session info.
func AsRoutingContext(ctx context.Context) routing.Context {
return &Context{

12
infra/conf/dns.go
View file

@ -108,10 +108,11 @@ var typeMap = map[router.Domain_Type]dns.DomainMatchingType{
// DNSConfig is a JSON serializable object for dns.Config.
type DNSConfig struct {
Servers []*NameServerConfig `json:"servers"`
Hosts map[string]*Address `json:"hosts"`
ClientIP *Address `json:"clientIp"`
Tag string `json:"tag"`
Servers []*NameServerConfig `json:"servers"`
Hosts map[string]*Address `json:"hosts"`
ClientIP *Address `json:"clientIp"`
Tag string `json:"tag"`
DisableCache bool `json:"disableCache"`
}
func getHostMapping(addr *Address) *dns.Config_HostMapping {
@ -129,7 +130,8 @@ func getHostMapping(addr *Address) *dns.Config_HostMapping {
// Build implements Buildable
func (c *DNSConfig) Build() (*dns.Config, error) {
config := &dns.Config{
Tag: c.Tag,
Tag: c.Tag,
DisableCache: c.DisableCache,
}
if c.ClientIP != nil {