mirror of
https://github.com/MetaCubeX/mihomo.git
synced 2024-08-25 11:22:32 +00:00
264 lines
6.1 KiB
Go
264 lines
6.1 KiB
Go
package tunnel
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import (
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"fmt"
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"net"
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"sync"
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"time"
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InboundAdapter "github.com/Dreamacro/clash/adapters/inbound"
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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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tunnel *Tunnel
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once sync.Once
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)
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// Tunnel handle relay inbound proxy and outbound proxy
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type Tunnel struct {
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queue *channels.InfiniteChannel
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rules []C.Rule
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proxies map[string]C.Proxy
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configMux *sync.RWMutex
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traffic *C.Traffic
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// experimental features
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ignoreResolveFail bool
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// Outbound Rule
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mode Mode
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}
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// Add request to queue
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func (t *Tunnel) Add(req C.ServerAdapter) {
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t.queue.In() <- req
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}
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// Traffic return traffic of all connections
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func (t *Tunnel) Traffic() *C.Traffic {
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return t.traffic
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}
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// Rules return all rules
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func (t *Tunnel) Rules() []C.Rule {
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return t.rules
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}
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// UpdateRules handle update rules
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func (t *Tunnel) UpdateRules(rules []C.Rule) {
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t.configMux.Lock()
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t.rules = rules
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t.configMux.Unlock()
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}
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// Proxies return all proxies
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func (t *Tunnel) Proxies() map[string]C.Proxy {
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return t.proxies
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}
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// UpdateProxies handle update proxies
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func (t *Tunnel) UpdateProxies(proxies map[string]C.Proxy) {
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t.configMux.Lock()
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t.proxies = proxies
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t.configMux.Unlock()
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}
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// UpdateExperimental handle update experimental config
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func (t *Tunnel) UpdateExperimental(ignoreResolveFail bool) {
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t.configMux.Lock()
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t.ignoreResolveFail = ignoreResolveFail
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t.configMux.Unlock()
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}
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// Mode return current mode
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func (t *Tunnel) Mode() Mode {
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return t.mode
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}
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// SetMode change the mode of tunnel
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func (t *Tunnel) SetMode(mode Mode) {
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t.mode = mode
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}
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func (t *Tunnel) process() {
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queue := t.queue.Out()
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for {
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elm := <-queue
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conn := elm.(C.ServerAdapter)
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go t.handleConn(conn)
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}
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}
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func (t *Tunnel) resolveIP(host string) (net.IP, error) {
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return dns.ResolveIP(host)
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}
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func (t *Tunnel) needLookupIP(metadata *C.Metadata) bool {
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return dns.DefaultResolver != nil && (dns.DefaultResolver.IsMapping() || dns.DefaultResolver.IsFakeIP()) && metadata.Host == "" && metadata.DstIP != nil
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}
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func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
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defer func() {
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var conn net.Conn
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switch adapter := localConn.(type) {
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case *InboundAdapter.HTTPAdapter:
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conn = adapter.Conn
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case *InboundAdapter.SocketAdapter:
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conn = adapter.Conn
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}
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if _, ok := conn.(*net.TCPConn); ok {
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localConn.Close()
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}
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}()
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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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// preprocess enhanced-mode metadata
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if t.needLookupIP(metadata) {
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host, exist := dns.DefaultResolver.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 dns.DefaultResolver.IsFakeIP() {
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metadata.DstIP = nil
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}
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}
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}
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var proxy C.Proxy
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var rule C.Rule
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switch t.mode {
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case Direct:
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proxy = t.proxies["DIRECT"]
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case Global:
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proxy = t.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 = t.match(metadata)
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if err != nil {
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return
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}
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}
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switch metadata.NetWork {
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case C.TCP:
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t.handleTCPConn(localConn, metadata, proxy, rule)
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case C.UDP:
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t.handleUDPConn(localConn, metadata, proxy, rule)
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}
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}
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func (t *Tunnel) handleUDPConn(localConn C.ServerAdapter, metadata *C.Metadata, proxy C.Proxy, rule C.Rule) {
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pc, addr := natTable.Get(localConn.RemoteAddr())
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if pc == nil {
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rawPc, nAddr, err := proxy.DialUDP(metadata)
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addr = nAddr
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pc = rawPc
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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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if rule != nil {
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log.Infoln("%s --> %v match %s using %s", metadata.SrcIP.String(), metadata.String(), rule.RuleType().String(), rawPc.Chains().String())
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} else {
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log.Infoln("%s --> %v doesn't match any rule using DIRECT", metadata.SrcIP.String(), metadata.String())
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}
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natTable.Set(localConn.RemoteAddr(), pc, addr)
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go t.handleUDPToLocal(localConn, pc)
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}
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t.handleUDPToRemote(localConn, pc, addr)
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}
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func (t *Tunnel) handleTCPConn(localConn C.ServerAdapter, metadata *C.Metadata, proxy C.Proxy, rule C.Rule) {
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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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defer remoteConn.Close()
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if rule != nil {
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log.Infoln("%s --> %v match %s using %s", metadata.SrcIP.String(), metadata.String(), rule.RuleType().String(), remoteConn.Chains().String())
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} else {
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log.Infoln("%s --> %v doesn't match any rule using DIRECT", metadata.SrcIP.String(), metadata.String())
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}
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switch adapter := localConn.(type) {
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case *InboundAdapter.HTTPAdapter:
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t.handleHTTP(adapter, remoteConn)
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case *InboundAdapter.SocketAdapter:
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t.handleSocket(adapter, remoteConn)
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}
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}
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func (t *Tunnel) shouldResolveIP(rule C.Rule, metadata *C.Metadata) bool {
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return (rule.RuleType() == C.GEOIP || rule.RuleType() == C.IPCIDR) && metadata.Host != "" && metadata.DstIP == nil
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}
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func (t *Tunnel) match(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
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t.configMux.RLock()
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defer t.configMux.RUnlock()
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var resolved bool
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for _, rule := range t.rules {
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if !resolved && t.shouldResolveIP(rule, metadata) {
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ip, err := t.resolveIP(metadata.Host)
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if err != nil {
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if !t.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.IsMatch(metadata) {
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adapter, ok := t.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 t.proxies["DIRECT"], nil, nil
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}
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func newTunnel() *Tunnel {
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return &Tunnel{
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queue: channels.NewInfiniteChannel(),
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proxies: make(map[string]C.Proxy),
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configMux: &sync.RWMutex{},
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traffic: C.NewTraffic(time.Second),
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mode: Rule,
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}
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}
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// Instance return singleton instance of Tunnel
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func Instance() *Tunnel {
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once.Do(func() {
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tunnel = newTunnel()
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go tunnel.process()
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})
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return tunnel
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}
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