mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-23 17:11:28 +00:00
449 lines
13 KiB
Go
449 lines
13 KiB
Go
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"
|
|
)
|
|
|
|
// Server is a DNS rely server.
|
|
type Server struct {
|
|
sync.Mutex
|
|
hosts *StaticHosts
|
|
clientIP net.IP
|
|
clients []Client // clientIdx -> Client
|
|
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)),
|
|
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
|
|
}))
|
|
|
|
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 IPOption) ([]net.IP, error) {
|
|
ctx, cancel := context.WithTimeout(context.Background(), time.Second*4)
|
|
if len(s.tag) > 0 {
|
|
ctx = session.ContextWithInbound(ctx, &session.Inbound{
|
|
Tag: s.tag,
|
|
})
|
|
}
|
|
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
|
|
}
|
|
|
|
// LookupIP implements dns.Client.
|
|
func (s *Server) LookupIP(domain string) ([]net.IP, error) {
|
|
return s.lookupIPInternal(domain, IPOption{
|
|
IPv4Enable: true,
|
|
IPv6Enable: true,
|
|
})
|
|
}
|
|
|
|
// LookupIPv4 implements dns.IPv4Lookup.
|
|
func (s *Server) LookupIPv4(domain string) ([]net.IP, error) {
|
|
return s.lookupIPInternal(domain, IPOption{
|
|
IPv4Enable: true,
|
|
IPv6Enable: false,
|
|
})
|
|
}
|
|
|
|
// LookupIPv6 implements dns.IPv6Lookup.
|
|
func (s *Server) LookupIPv6(domain string) ([]net.IP, error) {
|
|
return s.lookupIPInternal(domain, IPOption{
|
|
IPv4Enable: false,
|
|
IPv6Enable: true,
|
|
})
|
|
}
|
|
|
|
func (s *Server) lookupStatic(domain string, option 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
|
|
}
|
|
|
|
func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, error) {
|
|
if domain == "" {
|
|
return nil, newError("empty domain name")
|
|
}
|
|
domain = strings.ToLower(domain)
|
|
|
|
// normalize the FQDN form query
|
|
if domain[len(domain)-1] == '.' {
|
|
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]
|
|
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
|
|
}
|
|
|
|
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))
|
|
}))
|
|
}
|