mirror of https://github.com/Dreamacro/clash.git
433 lines
10 KiB
Go
433 lines
10 KiB
Go
package tunnel
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import (
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"context"
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"fmt"
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"net"
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"net/netip"
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"runtime"
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"strconv"
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"sync"
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"time"
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"github.com/Dreamacro/clash/adapter/inbound"
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"github.com/Dreamacro/clash/component/nat"
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P "github.com/Dreamacro/clash/component/process"
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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/constant/provider"
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icontext "github.com/Dreamacro/clash/context"
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"github.com/Dreamacro/clash/log"
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"github.com/Dreamacro/clash/tunnel/statistic"
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"go.uber.org/atomic"
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)
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var (
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tcpQueue = make(chan C.ConnContext, 200)
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udpQueue = make(chan *inbound.PacketAdapter, 200)
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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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// 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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// experimental feature
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UDPFallbackMatch = atomic.NewBool(false)
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)
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func init() {
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go process()
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}
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// TCPIn return fan-in queue
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func TCPIn() chan<- C.ConnContext {
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return tcpQueue
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}
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// UDPIn return fan-in udp queue
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func UDPIn() chan<- *inbound.PacketAdapter {
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return udpQueue
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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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// 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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// processUDP starts a loop to handle udp packet
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func processUDP() {
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queue := udpQueue
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for conn := range queue {
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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 num := runtime.GOMAXPROCS(0); num > numUDPWorkers {
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numUDPWorkers = num
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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
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for conn := range queue {
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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 resolver.MappingEnabled() && 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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metadata.Host = ""
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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 := resolver.FindHostByIP(metadata.DstIP)
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if exist {
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metadata.Host = host
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metadata.DNSMode = C.DNSMapping
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if resolver.FakeIPEnabled() {
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metadata.DstIP = nil
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metadata.DNSMode = C.DNSFakeIP
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} else if node := resolver.DefaultHosts.Search(host); node != nil {
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// redir-host should lookup the hosts
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metadata.DstIP = node.Data.(net.IP)
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}
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} else if resolver.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(ctx C.PlainContext, metadata *C.Metadata) (proxy C.Proxy, rule C.Rule, err error) {
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if metadata.SpecialProxy != "" {
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var exist bool
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proxy, exist = proxies[metadata.SpecialProxy]
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if !exist {
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err = fmt.Errorf("proxy %s not found", metadata.SpecialProxy)
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}
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return
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}
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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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proxy, rule, err = match(metadata)
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}
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return
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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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packet.Drop()
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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 request ip is fakeip
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var fAddr netip.Addr
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if resolver.IsExistFakeIP(metadata.DstIP) {
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fAddr, _ = netip.AddrFromSlice(metadata.DstIP)
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fAddr = fAddr.Unmap()
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}
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if err := preHandleMetadata(metadata); err != nil {
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packet.Drop()
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log.Debugln("[Metadata PreHandle] error: %s", err)
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return
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}
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// local resolve UDP dns
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if !metadata.Resolved() {
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ips, err := resolver.LookupIP(context.Background(), metadata.Host)
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if err != nil {
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packet.Drop()
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return
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} else if len(ips) == 0 {
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packet.Drop()
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return
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}
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metadata.DstIP = ips[0]
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}
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key := packet.LocalAddr().String()
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handle := func() bool {
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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 true
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}
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return false
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}
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if handle() {
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packet.Drop()
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return
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}
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lockKey := key + "-lock"
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cond, loaded := natTable.GetOrCreateLock(lockKey)
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go func() {
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defer packet.Drop()
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if loaded {
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cond.L.Lock()
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cond.Wait()
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handle()
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cond.L.Unlock()
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return
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}
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defer func() {
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natTable.Delete(lockKey)
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cond.Broadcast()
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}()
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pCtx := icontext.NewPacketConnContext(metadata)
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proxy, rule, err := resolveMetadata(pCtx, 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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return
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}
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ctx, cancel := context.WithTimeout(context.Background(), C.DefaultUDPTimeout)
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defer cancel()
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rawPc, err := proxy.ListenPacketContext(ctx, metadata.Pure())
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if err != nil {
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if rule == nil {
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log.Warnln(
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"[UDP] dial %s %s --> %s error: %s",
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proxy.Name(),
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metadata.SourceAddress(),
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metadata.RemoteAddress(),
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err.Error(),
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)
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} else {
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log.Warnln("[UDP] dial %s (match %s/%s) %s --> %s error: %s", proxy.Name(), rule.RuleType().String(), rule.Payload(), metadata.SourceAddress(), metadata.RemoteAddress(), err.Error())
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}
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return
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}
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pCtx.InjectPacketConn(rawPc)
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pc := statistic.NewUDPTracker(rawPc, statistic.DefaultManager, metadata, rule)
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switch true {
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case metadata.SpecialProxy != "":
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log.Infoln("[UDP] %s --> %s using %s", metadata.SourceAddress(), metadata.RemoteAddress(), metadata.SpecialProxy)
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case rule != nil:
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log.Infoln(
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"[UDP] %s --> %s match %s(%s) using %s",
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metadata.SourceAddress(),
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metadata.RemoteAddress(),
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rule.RuleType().String(),
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rule.Payload(),
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rawPc.Chains().String(),
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)
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case mode == Global:
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log.Infoln("[UDP] %s --> %s using GLOBAL", metadata.SourceAddress(), metadata.RemoteAddress())
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case mode == Direct:
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log.Infoln("[UDP] %s --> %s using DIRECT", metadata.SourceAddress(), metadata.RemoteAddress())
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default:
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log.Infoln(
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"[UDP] %s --> %s doesn't match any rule using DIRECT",
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metadata.SourceAddress(),
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metadata.RemoteAddress(),
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)
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}
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oAddr, _ := netip.AddrFromSlice(metadata.DstIP)
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oAddr = oAddr.Unmap()
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go handleUDPToLocal(packet.UDPPacket, pc, key, oAddr, fAddr)
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natTable.Set(key, pc)
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handle()
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}()
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}
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func handleTCPConn(connCtx C.ConnContext) {
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defer connCtx.Conn().Close()
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metadata := connCtx.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(connCtx, metadata)
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if err != nil {
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log.Warnln("[Metadata] parse failed: %s", err.Error())
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return
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}
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ctx, cancel := context.WithTimeout(context.Background(), C.DefaultTCPTimeout)
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defer cancel()
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remoteConn, err := proxy.DialContext(ctx, metadata.Pure())
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if err != nil {
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if rule == nil {
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log.Warnln(
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"[TCP] dial %s %s --> %s error: %s",
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proxy.Name(),
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metadata.SourceAddress(),
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metadata.RemoteAddress(),
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err.Error(),
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)
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} else {
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log.Warnln("[TCP] dial %s (match %s/%s) %s --> %s error: %s", proxy.Name(), rule.RuleType().String(), rule.Payload(), metadata.SourceAddress(), metadata.RemoteAddress(), err.Error())
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}
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return
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}
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remoteConn = statistic.NewTCPTracker(remoteConn, statistic.DefaultManager, metadata, rule)
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defer remoteConn.Close()
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switch true {
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case metadata.SpecialProxy != "":
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log.Infoln("[TCP] %s --> %s using %s", metadata.SourceAddress(), metadata.RemoteAddress(), metadata.SpecialProxy)
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case rule != nil:
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log.Infoln(
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"[TCP] %s --> %s match %s(%s) using %s",
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metadata.SourceAddress(),
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metadata.RemoteAddress(),
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rule.RuleType().String(),
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rule.Payload(),
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remoteConn.Chains().String(),
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)
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case mode == Global:
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log.Infoln("[TCP] %s --> %s using GLOBAL", metadata.SourceAddress(), metadata.RemoteAddress())
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case mode == Direct:
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log.Infoln("[TCP] %s --> %s using DIRECT", metadata.SourceAddress(), metadata.RemoteAddress())
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default:
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log.Infoln(
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"[TCP] %s --> %s doesn't match any rule using DIRECT",
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metadata.SourceAddress(),
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metadata.RemoteAddress(),
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)
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}
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handleSocket(connCtx, remoteConn)
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}
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func shouldResolveIP(rule C.Rule, metadata *C.Metadata) bool {
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return rule.ShouldResolveIP() && 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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var processFound 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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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 !processFound && rule.ShouldFindProcess() {
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processFound = true
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srcIP, ok := netip.AddrFromSlice(metadata.SrcIP)
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srcPort, err := strconv.ParseUint(metadata.SrcPort, 10, 16)
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if ok && err == nil && metadata.OriginDst.IsValid() {
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path, err := P.FindProcessPath(metadata.NetWork.String(), netip.AddrPortFrom(srcIP, uint16(srcPort)), metadata.OriginDst)
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if err != nil {
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log.Debugln("[Process] find process %s: %v", metadata.String(), err)
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} else {
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log.Debugln("[Process] %s from process %s", metadata.String(), path)
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metadata.ProcessPath = path
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}
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}
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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() && UDPFallbackMatch.Load() {
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log.Debugln("[Matcher] %s UDP is not supported, skip match", 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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