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