mirror of
https://github.com/MetaCubeX/mihomo.git
synced 2024-07-08 22:07:48 +00:00
345 lines
8 KiB
Go
345 lines
8 KiB
Go
package tunnel
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import (
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"fmt"
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"net"
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"runtime"
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"sync"
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"time"
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"github.com/Dreamacro/clash/adapters/inbound"
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"github.com/Dreamacro/clash/adapters/provider"
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"github.com/Dreamacro/clash/component/nat"
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"github.com/Dreamacro/clash/component/resolver"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/dns"
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"github.com/Dreamacro/clash/log"
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channels "gopkg.in/eapache/channels.v1"
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)
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var (
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tcpQueue = channels.NewInfiniteChannel()
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udpQueue = channels.NewInfiniteChannel()
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natTable = nat.New()
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rules []C.Rule
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proxies = make(map[string]C.Proxy)
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providers map[string]provider.ProxyProvider
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configMux sync.RWMutex
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enhancedMode *dns.Resolver
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// experimental features
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ignoreResolveFail bool
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// Outbound Rule
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mode = Rule
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// default timeout for UDP session
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udpTimeout = 60 * time.Second
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)
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func init() {
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go process()
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}
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// Add request to queue
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func Add(req C.ServerAdapter) {
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tcpQueue.In() <- req
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}
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// AddPacket add udp Packet to queue
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func AddPacket(packet *inbound.PacketAdapter) {
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udpQueue.In() <- packet
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}
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// Rules return all rules
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func Rules() []C.Rule {
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return rules
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}
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// UpdateRules handle update rules
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func UpdateRules(newRules []C.Rule) {
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configMux.Lock()
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rules = newRules
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configMux.Unlock()
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}
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// Proxies return all proxies
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func Proxies() map[string]C.Proxy {
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return proxies
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}
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// Providers return all compatible providers
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func Providers() map[string]provider.ProxyProvider {
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return providers
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}
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// UpdateProxies handle update proxies
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func UpdateProxies(newProxies map[string]C.Proxy, newProviders map[string]provider.ProxyProvider) {
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configMux.Lock()
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proxies = newProxies
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providers = newProviders
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configMux.Unlock()
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}
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// UpdateExperimental handle update experimental config
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func UpdateExperimental(value bool) {
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configMux.Lock()
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ignoreResolveFail = value
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configMux.Unlock()
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}
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// Mode return current mode
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func Mode() TunnelMode {
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return mode
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}
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// SetMode change the mode of tunnel
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func SetMode(m TunnelMode) {
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mode = m
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}
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// SetResolver set custom dns resolver for enhanced mode
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func SetResolver(r *dns.Resolver) {
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enhancedMode = r
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}
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// processUDP starts a loop to handle udp packet
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func processUDP() {
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queue := udpQueue.Out()
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for elm := range queue {
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conn := elm.(*inbound.PacketAdapter)
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handleUDPConn(conn)
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}
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}
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func process() {
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numUDPWorkers := 4
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if runtime.NumCPU() > numUDPWorkers {
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numUDPWorkers = runtime.NumCPU()
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}
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for i := 0; i < numUDPWorkers; i++ {
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go processUDP()
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}
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queue := tcpQueue.Out()
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for elm := range queue {
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conn := elm.(C.ServerAdapter)
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go handleTCPConn(conn)
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}
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}
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func needLookupIP(metadata *C.Metadata) bool {
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return enhancedMode != nil && (enhancedMode.IsMapping() || enhancedMode.FakeIPEnabled()) && metadata.Host == "" && metadata.DstIP != nil
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}
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func preHandleMetadata(metadata *C.Metadata) error {
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// handle IP string on host
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if ip := net.ParseIP(metadata.Host); ip != nil {
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metadata.DstIP = ip
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}
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// preprocess enhanced-mode metadata
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if needLookupIP(metadata) {
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host, exist := enhancedMode.IPToHost(metadata.DstIP)
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if exist {
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metadata.Host = host
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metadata.AddrType = C.AtypDomainName
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if enhancedMode.FakeIPEnabled() {
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metadata.DstIP = nil
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}
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} else if enhancedMode.IsFakeIP(metadata.DstIP) {
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return fmt.Errorf("fake DNS record %s missing", metadata.DstIP)
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}
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}
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return nil
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}
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func resolveMetadata(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
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var proxy C.Proxy
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var rule C.Rule
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switch mode {
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case Direct:
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proxy = proxies["DIRECT"]
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case Global:
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proxy = proxies["GLOBAL"]
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// Rule
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default:
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var err error
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proxy, rule, err = match(metadata)
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if err != nil {
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return nil, nil, err
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}
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}
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return proxy, rule, nil
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}
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func handleUDPConn(packet *inbound.PacketAdapter) {
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metadata := packet.Metadata()
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if !metadata.Valid() {
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log.Warnln("[Metadata] not valid: %#v", metadata)
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return
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}
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// make a fAddr if requset ip is fakeip
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var fAddr net.Addr
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if enhancedMode != nil && enhancedMode.IsFakeIP(metadata.DstIP) {
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fAddr = metadata.UDPAddr()
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}
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if err := preHandleMetadata(metadata); err != nil {
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log.Debugln("[Metadata PreHandle] error: %s", err)
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return
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}
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key := packet.LocalAddr().String()
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pc := natTable.Get(key)
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if pc != nil {
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handleUDPToRemote(packet, pc, metadata)
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return
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}
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lockKey := key + "-lock"
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wg, loaded := natTable.GetOrCreateLock(lockKey)
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go func() {
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if !loaded {
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wg.Add(1)
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proxy, rule, err := resolveMetadata(metadata)
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if err != nil {
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log.Warnln("[UDP] Parse metadata failed: %s", err.Error())
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natTable.Delete(lockKey)
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wg.Done()
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return
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}
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rawPc, err := proxy.DialUDP(metadata)
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if err != nil {
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log.Warnln("[UDP] dial %s error: %s", proxy.Name(), err.Error())
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natTable.Delete(lockKey)
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wg.Done()
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return
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}
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pc = newUDPTracker(rawPc, DefaultManager, metadata, rule)
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switch true {
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case rule != nil:
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log.Infoln("[UDP] %s --> %v match %s using %s", metadata.SourceAddress(), metadata.String(), rule.RuleType().String(), rawPc.Chains().String())
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case mode == Global:
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log.Infoln("[UDP] %s --> %v using GLOBAL", metadata.SourceAddress(), metadata.String())
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case mode == Direct:
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log.Infoln("[UDP] %s --> %v using DIRECT", metadata.SourceAddress(), metadata.String())
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default:
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log.Infoln("[UDP] %s --> %v doesn't match any rule using DIRECT", metadata.SourceAddress(), metadata.String())
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}
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natTable.Set(key, pc)
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natTable.Delete(lockKey)
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wg.Done()
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go handleUDPToLocal(packet.UDPPacket, pc, key, fAddr)
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}
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wg.Wait()
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pc := natTable.Get(key)
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if pc != nil {
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handleUDPToRemote(packet, pc, metadata)
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}
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}()
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}
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func handleTCPConn(localConn C.ServerAdapter) {
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defer localConn.Close()
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metadata := localConn.Metadata()
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if !metadata.Valid() {
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log.Warnln("[Metadata] not valid: %#v", metadata)
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return
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}
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if err := preHandleMetadata(metadata); err != nil {
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log.Debugln("[Metadata PreHandle] error: %s", err)
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return
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}
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proxy, rule, err := resolveMetadata(metadata)
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if err != nil {
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log.Warnln("Parse metadata failed: %v", err)
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return
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}
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remoteConn, err := proxy.Dial(metadata)
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if err != nil {
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log.Warnln("dial %s error: %s", proxy.Name(), err.Error())
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return
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}
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remoteConn = newTCPTracker(remoteConn, DefaultManager, metadata, rule)
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defer remoteConn.Close()
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switch true {
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case rule != nil:
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log.Infoln("[TCP] %s --> %v match %s using %s", metadata.SourceAddress(), metadata.String(), rule.RuleType().String(), remoteConn.Chains().String())
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case mode == Global:
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log.Infoln("[TCP] %s --> %v using GLOBAL", metadata.SourceAddress(), metadata.String())
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case mode == Direct:
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log.Infoln("[TCP] %s --> %v using DIRECT", metadata.SourceAddress(), metadata.String())
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default:
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log.Infoln("[TCP] %s --> %v doesn't match any rule using DIRECT", metadata.SourceAddress(), metadata.String())
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}
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switch adapter := localConn.(type) {
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case *inbound.HTTPAdapter:
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handleHTTP(adapter, remoteConn)
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case *inbound.SocketAdapter:
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handleSocket(adapter, remoteConn)
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}
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}
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func shouldResolveIP(rule C.Rule, metadata *C.Metadata) bool {
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return !rule.NoResolveIP() && metadata.Host != "" && metadata.DstIP == nil
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}
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func match(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
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configMux.RLock()
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defer configMux.RUnlock()
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var resolved bool
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if node := resolver.DefaultHosts.Search(metadata.Host); node != nil {
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ip := node.Data.(net.IP)
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metadata.DstIP = ip
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resolved = true
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}
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for _, rule := range rules {
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if !resolved && shouldResolveIP(rule, metadata) {
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ip, err := resolver.ResolveIP(metadata.Host)
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if err != nil {
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if !ignoreResolveFail {
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return nil, nil, fmt.Errorf("[DNS] resolve %s error: %s", metadata.Host, err.Error())
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}
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log.Debugln("[DNS] resolve %s error: %s", metadata.Host, err.Error())
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} else {
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log.Debugln("[DNS] %s --> %s", metadata.Host, ip.String())
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metadata.DstIP = ip
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}
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resolved = true
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}
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if rule.Match(metadata) {
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adapter, ok := proxies[rule.Adapter()]
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if !ok {
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continue
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}
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if metadata.NetWork == C.UDP && !adapter.SupportUDP() {
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log.Debugln("%v UDP is not supported", adapter.Name())
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continue
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}
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return adapter, rule, nil
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}
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}
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return proxies["DIRECT"], nil, nil
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}
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