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Fix: some UDP issues (#265)

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This commit is contained in:
Jason Lyu
2019-10-11 20:11:18 +08:00
committed by Dreamacro
parent 0f63682bdf
commit 4cd8b6f24f
15 changed files with 228 additions and 243 deletions
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5
tunnel/connection.go
View File

@ -86,11 +86,14 @@ func (t *Tunnel) handleUDPToRemote(conn net.Conn, pc net.PacketConn, addr net.Ad
t.traffic.Up() <- int64(n)
}
func (t *Tunnel) handleUDPToLocal(conn net.Conn, pc net.PacketConn) {
func (t *Tunnel) handleUDPToLocal(conn net.Conn, pc net.PacketConn, key string, timeout time.Duration) {
buf := pool.BufPool.Get().([]byte)
defer pool.BufPool.Put(buf[:cap(buf)])
defer t.natTable.Delete(key)
defer pc.Close()
for {
pc.SetReadDeadline(time.Now().Add(timeout))
n, _, err := pc.ReadFrom(buf)
if err != nil {
return

22
tunnel/session.go
View File

@ -1,22 +0,0 @@
package tunnel
import (
"sync"
"time"
nat "github.com/Dreamacro/clash/component/nat-table"
)
var (
natTable *nat.Table
natOnce sync.Once
natTimeout = 120 * time.Second
)
func NATInstance() *nat.Table {
natOnce.Do(func() {
natTable = nat.New(natTimeout)
})
return natTable
}

157
tunnel/tunnel.go
View File

@ -7,6 +7,7 @@ import (
"time"
InboundAdapter "github.com/Dreamacro/clash/adapters/inbound"
"github.com/Dreamacro/clash/component/nat"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/clash/dns"
"github.com/Dreamacro/clash/log"
@ -17,11 +18,16 @@ import (
var (
tunnel *Tunnel
once sync.Once
// default timeout for UDP session
udpTimeout = 60 * time.Second
)
// Tunnel handle relay inbound proxy and outbound proxy
type Tunnel struct {
queue *channels.InfiniteChannel
tcpQueue *channels.InfiniteChannel
udpQueue *channels.InfiniteChannel
natTable *nat.Table
rules []C.Rule
proxies map[string]C.Proxy
configMux *sync.RWMutex
@ -36,7 +42,12 @@ type Tunnel struct {
// Add request to queue
func (t *Tunnel) Add(req C.ServerAdapter) {
t.queue.In() <- req
switch req.Metadata().NetWork {
case C.TCP:
t.tcpQueue.In() <- req
case C.UDP:
t.udpQueue.In() <- req
}
}
// Traffic return traffic of all connections
@ -86,11 +97,18 @@ func (t *Tunnel) SetMode(mode Mode) {
}
func (t *Tunnel) process() {
queue := t.queue.Out()
for {
elm := <-queue
go func() {
queue := t.udpQueue.Out()
for elm := range queue {
conn := elm.(C.ServerAdapter)
t.handleUDPConn(conn)
}
}()
queue := t.tcpQueue.Out()
for elm := range queue {
conn := elm.(C.ServerAdapter)
go t.handleConn(conn)
go t.handleTCPConn(conn)
}
}
@ -102,26 +120,7 @@ func (t *Tunnel) needLookupIP(metadata *C.Metadata) bool {
return dns.DefaultResolver != nil && (dns.DefaultResolver.IsMapping() || dns.DefaultResolver.IsFakeIP()) && metadata.Host == "" && metadata.DstIP != nil
}
func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
defer func() {
var conn net.Conn
switch adapter := localConn.(type) {
case *InboundAdapter.HTTPAdapter:
conn = adapter.Conn
case *InboundAdapter.SocketAdapter:
conn = adapter.Conn
}
if _, ok := conn.(*net.TCPConn); ok {
localConn.Close()
}
}()
metadata := localConn.Metadata()
if !metadata.Valid() {
log.Warnln("[Metadata] not valid: %#v", metadata)
return
}
func (t *Tunnel) resolveMetadata(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
// preprocess enhanced-mode metadata
if t.needLookupIP(metadata) {
host, exist := dns.DefaultResolver.IPToHost(*metadata.DstIP)
@ -146,43 +145,87 @@ func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
var err error
proxy, rule, err = t.match(metadata)
if err != nil {
return
return nil, nil, err
}
}
switch metadata.NetWork {
case C.TCP:
t.handleTCPConn(localConn, metadata, proxy, rule)
case C.UDP:
t.handleUDPConn(localConn, metadata, proxy, rule)
}
return proxy, rule, nil
}
func (t *Tunnel) handleUDPConn(localConn C.ServerAdapter, metadata *C.Metadata, proxy C.Proxy, rule C.Rule) {
pc, addr := natTable.Get(localConn.RemoteAddr())
if pc == nil {
rawPc, nAddr, err := proxy.DialUDP(metadata)
addr = nAddr
pc = rawPc
if err != nil {
log.Warnln("dial %s error: %s", proxy.Name(), err.Error())
return
}
if rule != nil {
log.Infoln("%s --> %v match %s using %s", metadata.SrcIP.String(), metadata.String(), rule.RuleType().String(), rawPc.Chains().String())
} else {
log.Infoln("%s --> %v doesn't match any rule using DIRECT", metadata.SrcIP.String(), metadata.String())
}
natTable.Set(localConn.RemoteAddr(), pc, addr)
go t.handleUDPToLocal(localConn, pc)
func (t *Tunnel) handleUDPConn(localConn C.ServerAdapter) {
metadata := localConn.Metadata()
if !metadata.Valid() {
log.Warnln("[Metadata] not valid: %#v", metadata)
return
}
t.handleUDPToRemote(localConn, pc, addr)
src := localConn.RemoteAddr().String()
dst := metadata.RemoteAddress()
key := src + "-" + dst
pc, addr := t.natTable.Get(key)
if pc != nil {
t.handleUDPToRemote(localConn, pc, addr)
return
}
lockKey := key + "-lock"
wg, loaded := t.natTable.GetOrCreateLock(lockKey)
go func() {
if !loaded {
wg.Add(1)
proxy, rule, err := t.resolveMetadata(metadata)
if err != nil {
log.Warnln("Parse metadata failed: %s", err.Error())
t.natTable.Delete(lockKey)
wg.Done()
return
}
rawPc, nAddr, err := proxy.DialUDP(metadata)
if err != nil {
log.Warnln("dial %s error: %s", proxy.Name(), err.Error())
t.natTable.Delete(lockKey)
wg.Done()
return
}
pc = rawPc
addr = nAddr
if rule != nil {
log.Infoln("%s --> %v match %s using %s", metadata.SrcIP.String(), metadata.String(), rule.RuleType().String(), rawPc.Chains().String())
} else {
log.Infoln("%s --> %v doesn't match any rule using DIRECT", metadata.SrcIP.String(), metadata.String())
}
t.natTable.Set(key, pc, addr)
t.natTable.Delete(lockKey)
wg.Done()
go t.handleUDPToLocal(localConn, pc, key, udpTimeout)
}
wg.Wait()
pc, addr := t.natTable.Get(key)
if pc != nil {
t.handleUDPToRemote(localConn, pc, addr)
}
}()
}
func (t *Tunnel) handleTCPConn(localConn C.ServerAdapter, metadata *C.Metadata, proxy C.Proxy, rule C.Rule) {
func (t *Tunnel) handleTCPConn(localConn C.ServerAdapter) {
defer localConn.Close()
metadata := localConn.Metadata()
if !metadata.Valid() {
log.Warnln("[Metadata] not valid: %#v", metadata)
return
}
proxy, rule, err := t.resolveMetadata(metadata)
if err != nil {
log.Warnln("Parse metadata failed: %v", err)
return
}
remoteConn, err := proxy.Dial(metadata)
if err != nil {
log.Warnln("dial %s error: %s", proxy.Name(), err.Error())
@ -253,7 +296,9 @@ func (t *Tunnel) match(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
func newTunnel() *Tunnel {
return &Tunnel{
queue: channels.NewInfiniteChannel(),
tcpQueue: channels.NewInfiniteChannel(),
udpQueue: channels.NewInfiniteChannel(),
natTable: nat.New(),
proxies: make(map[string]C.Proxy),
configMux: &sync.RWMutex{},
traffic: C.NewTraffic(time.Second),