Refine `PrioritizedDomain`, should fix https://github.com/XTLS/Xray-core/issues/638
This commit is contained in:
hmol233
parent
b85eef0131
commit
1ced7985d5
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@ -12,7 +12,6 @@ import (
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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/matcher/geoip"
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"github.com/xtls/xray-core/common/matcher/str"
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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/features"
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@ -29,8 +28,6 @@ type DNS struct {
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hosts *StaticHosts
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clients []*Client
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ctx context.Context
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domainMatcher str.IndexMatcher
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matcherInfos []DomainMatcherInfo
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}
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// DomainMatcherInfo contains information attached to index returned by Server.domainMatcher
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@ -89,9 +86,6 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
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domainRuleCount += len(ns.PrioritizedDomain)
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}
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// MatcherInfos is ensured to cover the maximum index domainMatcher could return, where matcher's index starts from 1
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matcherInfos := make([]DomainMatcherInfo, domainRuleCount+1)
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domainMatcher := &str.MatcherGroup{}
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geoipContainer := geoip.GeoIPMatcherContainer{}
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for _, endpoint := range config.NameServers {
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@ -104,22 +98,13 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
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}
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for _, ns := range config.NameServer {
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clientIdx := len(clients)
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updateDomain := func(domainRule str.Matcher, originalRuleIdx int, matcherInfos []DomainMatcherInfo) error {
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midx := domainMatcher.Add(domainRule)
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matcherInfos[midx] = DomainMatcherInfo{
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clientIdx: uint16(clientIdx),
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domainRuleIdx: uint16(originalRuleIdx),
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}
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return nil
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}
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myClientIP := clientIP
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switch len(ns.ClientIp) {
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case net.IPv4len, net.IPv6len:
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myClientIP = net.IP(ns.ClientIp)
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myClientIP = ns.ClientIp
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}
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client, err := NewClient(ctx, ns, myClientIP, geoipContainer, &matcherInfos, updateDomain)
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client, err := NewClient(ctx, ns, myClientIP, geoipContainer)
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if err != nil {
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return nil, newError("failed to create client").Base(err)
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}
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@ -137,8 +122,6 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
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ipOption: ipOption,
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clients: clients,
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ctx: ctx,
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domainMatcher: domainMatcher,
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matcherInfos: matcherInfos,
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cacheStrategy: config.CacheStrategy,
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disableFallback: config.DisableFallback,
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}, nil
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@ -268,21 +251,22 @@ func (s *DNS) sortClients(domain string, option *dns.IPOption) []*Client {
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}()
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// Priority domain matching
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for _, match := range s.domainMatcher.Match(domain) {
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info := s.matcherInfos[match]
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client := s.clients[info.clientIdx]
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domainRule := client.domains[info.domainRuleIdx]
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if !canQueryOnClient(option, client) {
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newError("skipping the client " + client.Name()).AtDebug().WriteToLog()
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continue
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for clientIdx, client := range s.clients {
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if ids := client.domainMatcher.Match(domain); len(ids) > 0 {
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if !canQueryOnClient(option, client) {
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newError("skipping the client " + client.Name()).AtDebug().WriteToLog()
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continue
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}
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for _, id := range ids {
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rule := client.findRule(id)
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domainRules = append(domainRules, fmt.Sprintf("%s(DNS idx:%d)", rule, clientIdx))
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}
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if clientUsed[clientIdx] {
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continue
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}
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clients = append(clients, client)
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clientNames = append(clientNames, client.Name())
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}
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domainRules = append(domainRules, fmt.Sprintf("%s(DNS idx:%d)", domainRule, info.clientIdx))
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if clientUsed[info.clientIdx] {
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continue
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}
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clientUsed[info.clientIdx] = true
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clients = append(clients, client)
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clientNames = append(clientNames, client.Name())
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}
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if !s.disableFallback {
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@ -25,11 +25,23 @@ type Server interface {
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// Client is the interface for DNS client.
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type Client struct {
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server Server
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clientIP net.IP
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skipFallback bool
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domains []string
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expectIPs []*geoip.GeoIPMatcher
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server Server
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clientIP net.IP
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skipFallback bool
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expectIPs []*geoip.GeoIPMatcher
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domainMatcher str.MatcherGroup
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originRules []*NameServer_OriginalRule
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}
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func (c Client) findRule(idx uint32) string {
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for _, r := range c.originRules {
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if idx <= r.Size {
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return r.Rule
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}
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idx -= r.Size
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}
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return "unknown rule"
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}
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var errExpectedIPNonMatch = errors.New("expectIPs not match")
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@ -64,7 +76,7 @@ func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, err
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}
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// NewClient creates a DNS client managing a name server with client IP, domain rules and expected IPs.
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func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container geoip.GeoIPMatcherContainer, matcherInfos *[]DomainMatcherInfo, updateDomainRule func(str.Matcher, int, []DomainMatcherInfo) error) (*Client, error) {
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func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container geoip.GeoIPMatcherContainer) (*Client, error) {
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client := &Client{}
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err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
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@ -79,55 +91,38 @@ func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container g
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ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
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ns.OriginalRules = append(ns.OriginalRules, localTLDsAndDotlessDomainsRule)
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// The following lines is a solution to avoid core panics（rule index out of range） when setting `localhost` DNS client in config.
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// Because the `localhost` DNS client will apend len(localTLDsAndDotlessDomains) rules into matcherInfos to match `geosite:private` default rule.
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// Because the `localhost` DNS client will append len(localTLDsAndDotlessDomains) rules into matcherInfos to match `geosite:private` default rule.
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// But `matcherInfos` has no enough length to add rules, which leads to core panics (rule index out of range).
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// 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.
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for i := 0; i < len(localTLDsAndDotlessDomains); i++ {
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*matcherInfos = append(*matcherInfos, DomainMatcherInfo{
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clientIdx: uint16(0),
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domainRuleIdx: uint16(0),
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})
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}
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// ;)
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/*
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for i := 0; i < len(localTLDsAndDotlessDomains); i++ {
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*matcherInfos = append(*matcherInfos, DomainMatcherInfo{
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clientIdx: uint16(0),
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domainRuleIdx: uint16(0),
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})
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}
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*/
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}
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// Establish domain rules
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var rules []string
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ruleCurr := 0
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ruleIter := 0
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var domainMatcher = str.MatcherGroup{}
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for _, domain := range ns.PrioritizedDomain {
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domainRule, err := toStrMatcher(domain.Type, domain.Value)
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if err != nil {
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return newError("failed to create prioritized domain").Base(err).AtWarning()
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}
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originalRuleIdx := ruleCurr
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if ruleCurr < len(ns.OriginalRules) {
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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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rules = append(rules, domainRule.String())
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ruleCurr++
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}
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err = updateDomainRule(domainRule, originalRuleIdx, *matcherInfos)
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if err != nil {
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return newError("failed to create prioritized domain").Base(err).AtWarning()
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}
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domainMatcher.Add(domainRule)
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}
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// Establish expected IPs
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var matchers []*geoip.GeoIPMatcher
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var ipMatchers []*geoip.GeoIPMatcher
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for _, geoip := range ns.Geoip {
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matcher, err := container.Add(geoip)
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if err != nil {
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return 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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ipMatchers = append(ipMatchers, matcher)
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}
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if len(clientIP) > 0 {
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@ -141,8 +136,9 @@ func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container g
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client.server = server
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client.clientIP = clientIP
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client.domains = rules
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client.expectIPs = matchers
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client.expectIPs = ipMatchers
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client.originRules = ns.OriginalRules
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client.domainMatcher = domainMatcher
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return nil
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})
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return client, err
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