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Improve: UDP relay refactor (#441)

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Co-authored-by: Dreamacro <Dreamacro@vip.qq.com>
This commit is contained in:
Comzyh
2019-12-28 18:44:01 +08:00
committed by Dreamacro
parent 3f592988a9
commit 93ea037230
11 changed files with 202 additions and 52 deletions
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56
tunnel/tunnel.go
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@ -3,6 +3,7 @@ package tunnel
import (
"fmt"
"net"
"runtime"
"sync"
"time"
@ -43,12 +44,12 @@ type Tunnel struct {
// Add request to queue
func (t *Tunnel) Add(req C.ServerAdapter) {
switch req.Metadata().NetWork {
case C.TCP:
t.tcpQueue.In() <- req
case C.UDP:
t.udpQueue.In() <- req
}
t.tcpQueue.In() <- req
}
// AddPacket add udp Packet to queue
func (t *Tunnel) AddPacket(packet *inbound.PacketAdapter) {
t.udpQueue.In() <- packet
}
// Rules return all rules
@ -98,14 +99,23 @@ func (t *Tunnel) SetMode(mode Mode) {
t.mode = mode
}
// processUDP starts a loop to handle udp packet
func (t *Tunnel) processUDP() {
queue := t.udpQueue.Out()
for elm := range queue {
conn := elm.(*inbound.PacketAdapter)
t.handleUDPConn(conn)
}
}
func (t *Tunnel) process() {
go func() {
queue := t.udpQueue.Out()
for elm := range queue {
conn := elm.(C.ServerAdapter)
t.handleUDPConn(conn)
}
}()
numUDPWorkers := 4
if runtime.NumCPU() > numUDPWorkers {
numUDPWorkers = runtime.NumCPU()
}
for i := 0; i < numUDPWorkers; i++ {
go t.processUDP()
}
queue := t.tcpQueue.Out()
for elm := range queue {
@ -119,7 +129,7 @@ func (t *Tunnel) resolveIP(host string) (net.IP, error) {
}
func (t *Tunnel) needLookupIP(metadata *C.Metadata) bool {
return dns.DefaultResolver != nil && (dns.DefaultResolver.IsMapping() || dns.DefaultResolver.IsFakeIP()) && metadata.Host == "" && metadata.DstIP != nil
return dns.DefaultResolver != nil && (dns.DefaultResolver.IsMapping() || dns.DefaultResolver.FakeIPEnabled()) && metadata.Host == "" && metadata.DstIP != nil
}
func (t *Tunnel) resolveMetadata(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
@ -134,7 +144,7 @@ func (t *Tunnel) resolveMetadata(metadata *C.Metadata) (C.Proxy, C.Rule, error)
if exist {
metadata.Host = host
metadata.AddrType = C.AtypDomainName
if dns.DefaultResolver.IsFakeIP() {
if dns.DefaultResolver.FakeIPEnabled() {
metadata.DstIP = nil
}
}
@ -158,25 +168,28 @@ func (t *Tunnel) resolveMetadata(metadata *C.Metadata) (C.Proxy, C.Rule, error)
return proxy, rule, nil
}
func (t *Tunnel) handleUDPConn(localConn C.ServerAdapter) {
metadata := localConn.Metadata()
func (t *Tunnel) handleUDPConn(packet *inbound.PacketAdapter) {
metadata := packet.Metadata()
if !metadata.Valid() {
log.Warnln("[Metadata] not valid: %#v", metadata)
return
}
src := localConn.RemoteAddr().String()
src := packet.LocalAddr().String()
dst := metadata.RemoteAddress()
key := src + "-" + dst
pc, addr := t.natTable.Get(key)
if pc != nil {
t.handleUDPToRemote(localConn, pc, addr)
t.handleUDPToRemote(packet, pc, addr)
return
}
lockKey := key + "-lock"
wg, loaded := t.natTable.GetOrCreateLock(lockKey)
isFakeIP := dns.DefaultResolver.IsFakeIP(metadata.DstIP)
go func() {
if !loaded {
wg.Add(1)
@ -207,13 +220,14 @@ func (t *Tunnel) handleUDPConn(localConn C.ServerAdapter) {
t.natTable.Set(key, pc, addr)
t.natTable.Delete(lockKey)
wg.Done()
go t.handleUDPToLocal(localConn, pc, key, udpTimeout)
// in fake-ip mode, Full-Cone NAT can never achieve, fallback to omitting src Addr
go t.handleUDPToLocal(packet.UDPPacket, pc, key, isFakeIP, udpTimeout)
}
wg.Wait()
pc, addr := t.natTable.Get(key)
if pc != nil {
t.handleUDPToRemote(localConn, pc, addr)
t.handleUDPToRemote(packet, pc, addr)
}
}()
}