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ahriClientPartner.go
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ahriClientPartner.go
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package core
import (
"crypto/cipher"
"errors"
"net"
"reflect"
"strconv"
"sync"
"time"
)
type ahriClientPartner struct {
clientName string
mode int
aesCipher cipher.Block
stopOnce sync.Once
quitFlag bool
quit chan int
heartbeatUnixTimeSec int64
realConnStop bool
realConnLock sync.RWMutex
realConn *net.TCPConn
receiverLoopStop bool
receiveFrameTruck chan AhriFrame
//key:string, value: *AhriConn
conns sync.Map
proxyFrameTaskSender chan *proxyFrameTask
proxyFrameReceiver chan AhriFrame
willClose func(clientName string)
}
func (partner *ahriClientPartner) stop() {
partner.stopOnce.Do(func() {
partner.quit <- 0
partner.quitFlag = true
partner.willClose(partner.clientName)
Log.NoLevelf("Removed client(%s), mode: %d", partner.clientName, partner.mode)
})
}
func (partner *ahriClientPartner) loopStarter() {
partner.quit = make(chan int)
partner.receiveFrameTruck = make(chan AhriFrame)
partner.proxyFrameReceiver = make(chan AhriFrame, AhriClientPartnerProxyFrameMaxSize)
go func() {
for {
select {
case frame := <-partner.receiveFrameTruck:
partner.dispatcher(frame)
case <-time.After(time.Microsecond):
if partner.quitFlag && partner.receiverLoopStop {
goto loopEnd
}
}
}
loopEnd:
Log.Warn("Ahri Partner receiveFrameTruck loop stopped.")
}()
go partner.receiverLoop()
go func() {
proxyFrameSender := func(proxyFrame AhriFrame) {
defer func() {
proxyFrame.free()
unknownError := recover()
if unknownError != nil {
if err, ok := unknownError.(error); ok {
errMsg := err.Error()
Log.Errorf("Unknown Error: %s", errMsg)
} else {
Log.Errorf("Unknown Error(%v): %v", reflect.TypeOf(unknownError), unknownError)
}
}
}()
e := partner.sender(proxyFrame)
if e != nil {
switch proxyFrame.frameType() {
case AfpFrameTypeDial:
Log.Warnf("Failed to transmit a AhriFrame(type: AfpFrameTypeDial -> AfpFrameTypeDialProxy), %v", e)
case AfpFrameTypeDialProxyAck:
Log.Warnf("Failed to transmit a AhriFrame(type: AfpFrameTypeDialProxyAck -> AfpFrameTypeDialAck), %v", e)
case AfpFrameTypeProxy:
Log.Warnf("Failed to transmit a AhriFrame(type: AfpFrameTypeDirect -> AfpFrameTypeProxy), %v", e)
case AfpFrameTypeDirect:
Log.Warnf("Failed to transmit a AhriFrame(type: AfpFrameTypeProxy -> AfpFrameTypeDirect), %v", e)
}
}
}
for {
if partner.quitFlag {
break
}
select {
case proxyFrame := <-partner.proxyFrameReceiver:
proxyFrameSender(proxyFrame)
}
}
}()
go func() {
for {
select {
case <-partner.quit:
goto loopEnd
case <-time.After(time.Second):
go partner.keepConn()
}
}
loopEnd:
partner.clearConn()
Log.Warn("Ahri Partner Closed.")
}()
}
func (partner *ahriClientPartner) clearConn() {
partner.realConnLock.Lock()
defer partner.realConnLock.Unlock()
partner.realConnStop = true
if partner.realConn != nil {
partner.realConn.Close()
partner.realConn = nil
partner.conns.Range(func(key, value interface{}) bool {
defer func() {
recover()
}()
conn := value.(*AhriConn)
conn.Close()
return true
})
}
}
func (partner *ahriClientPartner) keepConn() {
partner.realConnLock.Lock()
defer partner.realConnLock.Unlock()
if partner.realConn == nil {
go partner.stop()
return
}
//Check if the heartbeat of the client has timed out
if time.Now().Unix()-partner.heartbeatUnixTimeSec > 2 * int64(AhriTimeoutSec) {
go partner.stop()
return
}
//send heartbeat
heartbeatFrame := AhriFrame(make([]byte, 17))
heartbeatFrame[0] = AfpFlag
heartbeatFrame.setFrameType(AfpFrameTypeHeartbeat)
heartbeatFrame.setFrom(AhriAddrNameAhriServer)
heartbeatFrame.setTo(partner.clientName)
heartbeatFrame.setConnId(0)
heartbeatFrame = heartbeatFrame.setPayload(make([]byte, 1))
if _, e := partner.realConn.Write(heartbeatFrame); e != nil {
Log.Warnf("Failed to send heartbeat frame, Err(%v)", e)
go partner.stop()
}
}
func (partner *ahriClientPartner) receiverLoop() {
partner.receiverLoopStop = false
defer func() {
partner.receiverLoopStop = true
}()
partner.realConnStop = false
var buf, remain []byte
defer func() {
if buf != nil {
ByteArrPool.Put(buf)
}
if remain != nil {
ByteArrPool.Put(remain)
}
}()
for {
if partner.realConnStop {
break
}
partner.realConnLock.RLock()
realConn := partner.realConn;
partner.realConnLock.RUnlock()
if realConn == nil {
break
}
buf = ByteArrPool.Get()
n, e := realConn.Read(buf)
if e != nil {
ByteArrPool.Put(buf)
Log.Warnf("Failed to read data from the real tcp connection, Err(%v).", e)
go partner.clearConn()
break
}
if n == 0 {
ByteArrPool.Put(buf)
continue
}
if (remain == nil && buf[0] != AfpFlag) || (remain != nil && remain[0] != AfpFlag) {
Log.Warn("Encountered an expected error while parsing the real tcp conn data. There may be a network packet loss situation. The Receiver Loop was interrupted.")
go partner.clearConn()
break
}
if (remain == nil && buf[0] == AfpFlag) || (remain != nil && remain[0] == AfpFlag) {
if remain != nil {
remain = append(remain, buf[0:n]...)
n = len(remain)
remain, buf = buf, remain
ByteArrPool.Put(remain)
remain = nil
}
readIndex := 0
SplitFrame:
if n-readIndex <= 16 {
remain = ByteArrPool.Get()
copy(remain, buf[readIndex:n])
remain = remain[0 : n-readIndex]
ByteArrPool.Put(buf)
continue
}
payloadLen := int(BytesToUint16(buf[readIndex+AfpHeaderLen-2 : readIndex+AfpHeaderLen]))
payloadMaxLen := n - readIndex - AfpHeaderLen
if payloadLen < payloadMaxLen {
//one frame and a part (may another frame or other frames)
splitIndex := readIndex + AfpHeaderLen + payloadLen
partner.receiveFrameTruck <- NewAhriFrame(buf[readIndex:splitIndex])
readIndex = splitIndex
goto SplitFrame
}
if payloadLen == payloadMaxLen {
partner.receiveFrameTruck <- NewAhriFrame(buf[readIndex:n])
ByteArrPool.Put(buf)
continue
}
if payloadLen > payloadMaxLen {
remain = ByteArrPool.Get()
remainBuf := buf[readIndex:n]
copy(remain, remainBuf)
remain = remain[0:len(remainBuf)]
ByteArrPool.Put(buf)
continue
}
}
//The program should not have been executed to this line.
Log.Error("Encountered an unexpected error while parsing the real tcp conn data. The Receiver Loop was interrupted.")
go partner.clearConn()
break
}
}
func (partner *ahriClientPartner) dispatcher(frame AhriFrame) {
needFree := true
defer func() {
if frame != nil && needFree {
frame.free()
}
unknownError := recover()
if unknownError != nil {
if err, ok := unknownError.(error); ok {
errMsg := err.Error()
if IgnoreErrorSendOnClosedChannel == errMsg {
return
} else {
Log.Errorf("Unknown Error: %s", errMsg)
}
} else {
Log.Errorf("Unknown Error(%v): %v", reflect.TypeOf(unknownError), unknownError)
}
}
}()
if partner.quitFlag {
return
}
if AfpFrameTypeHeartbeat == frame.frameType() {
partner.heartbeatUnixTimeSec = time.Now().Unix()
return
}
switch frame.frameType() {
case AfpFrameTypeDial:
if AhriAddrNameAhriServer == frame.to() {
oPayload := frame.payload()
payload := make([]byte, len(oPayload))
copy(payload, oPayload)
go partner.serverDialHandler(frame.from(), frame.connId(), payload)
return
} else {
partner.proxyFrameTaskSender <- &proxyFrameTask{proxyFrame: frame, aesCipher: nil}
needFree = false
return
}
case AfpFrameTypeDialProxyAck:
partner.proxyFrameTaskSender <- &proxyFrameTask{proxyFrame: frame, aesCipher: nil}
needFree = false
return
case AfpFrameTypeDirect:
if AhriAddrNameAhriServer == frame.to() {
//find the AhriConn
connId := make([]byte, 10)
copy(connId[0:2], frame.from())
copy(connId[2:], Uint64ToBytes(frame.connId()))
value, _ := partner.conns.Load(string(connId))
if value == nil {
return
}
conn := value.(*AhriConn)
select {
case conn.receiver <- frame:
needFree = false
case <-time.After(time.Duration(AhriTimeoutSec) * time.Second):
go conn.Close()
}
return
} else {
partner.proxyFrameTaskSender <- &proxyFrameTask{proxyFrame: frame, aesCipher: partner.aesCipher}
needFree = false
return
}
case AfpFrameTypeProxy:
partner.proxyFrameTaskSender <- &proxyFrameTask{proxyFrame: frame, aesCipher: partner.aesCipher}
needFree = false
return
}
}
func (partner *ahriClientPartner) sender(frame AhriFrame) error {
partner.realConnLock.RLock()
realConn := partner.realConn
partner.realConnLock.RUnlock()
if realConn != nil {
length := len(frame)
for i := 0; i < length; {
n, e := realConn.Write(frame[i:length])
if e != nil {
return e
}
i += n
}
return nil
}
return errors.New("the real tcp connection is unavailable")
}
func (partner *ahriClientPartner) logonVirtualConn(ahriConn *AhriConn) {
partner.conns.Store(ahriConn.Id(), ahriConn)
}
func (partner *ahriClientPartner) logoffVirtualConn(ahriConn *AhriConn) {
partner.conns.Delete(ahriConn.Id())
}
func (partner *ahriClientPartner) serverDialHandler(from string, connId uint64, payload []byte) {
defer func() {
e := recover()
if e != nil {
Log.Errorf("%v", e)
}
}()
ackFrame := AhriFrame(make([]byte, AfpHeaderLen+1))
ackFrame[0] = AfpFlag
ackFrame.setFrameType(AfpFrameTypeDialAck)
ackFrame.setFrom(AhriAddrNameAhriServer)
ackFrame.setTo(from)
ackFrame.setConnId(connId)
var dstAddr net.IP
switch payload[0] {
case Socks5AddrTypeIPv4:
dstAddr = payload[1 : 1+net.IPv4len]
case Socks5AddrTypeIPv6:
dstAddr = payload[1 : 1+net.IPv6len]
case Socks5AddrTypeDomain:
dstAddr = payload[2 : 2+payload[1]]
default:
Log.Warnf("Invalid ATYP: %v", payload[0])
ackFrame = ackFrame.setPayload([]byte{AfpAckErr})
_ = partner.sender(ackFrame)
return
}
n := len(payload)
port := int(BytesToUint16(payload[n-2 : n]))
addr := &AhriAddr{name: AhriAddrNameAhriServer, addrType: int(payload[0]), dstAddr: dstAddr, port: port}
if e := addr.ParseDstAddrIP(); e != nil {
Log.Warnf("%v", e)
ackFrame = ackFrame.setPayload([]byte{AfpAckErr})
_ = partner.sender(ackFrame)
return
}
c, e := net.DialTimeout("tcp", NetAddrString(net.IP(addr.dstAddr).String(), strconv.Itoa(addr.port)), time.Second)
if e != nil {
Log.Warnf("%v", e)
ackFrame = ackFrame.setPayload([]byte{AfpAckErr})
_ = partner.sender(ackFrame)
return
}
serverConn := c.(*net.TCPConn)
serverConn.SetLinger(0)
defer serverConn.Close()
ahriConn := NewAhriConnForVirtualization(
AhriAddrNameAhriServer,
from,
connId,
partner.aesCipher,
AfpFrameTypeDirect,
make(chan AhriFrame),
partner.sender,
partner.logoffVirtualConn)
partner.logonVirtualConn(ahriConn)
defer ahriConn.Close()
ackFrame = ackFrame.setPayload([]byte{AfpAckOk})
e = partner.sender(ackFrame)
if e != nil {
Log.Errorf("%v", e)
return
}
connJoint(connId, serverConn, ahriConn)
}