func Dial(dest v2net.Destination) (net.Conn, error) {
var ip net.IP
if dest.Address().IsIPv4() || dest.Address().IsIPv6() {
ip = dest.Address().IP()
} else {
ips, err := net.LookupIP(dest.Address().Domain())
if err != nil {
return nil, err
}
if len(ips) == 0 {
return nil, ErrInvalidHost
}
ip = ips[dice.Roll(len(ips))]
}
if dest.IsTCP() {
return net.DialTCP("tcp", nil, &net.TCPAddr{
IP: ip,
Port: int(dest.Port()),
})
} else {
return net.DialUDP("udp", nil, &net.UDPAddr{
IP: ip,
Port: int(dest.Port()),
})
}
}
func Dial(dest v2net.Destination) (net.Conn, error) {
if dest.Address().IsDomain() {
dialer := &net.Dialer{
Timeout: time.Second * 60,
DualStack: true,
}
network := "tcp"
if dest.IsUDP() {
network = "udp"
}
return dialer.Dial(network, dest.NetAddr())
}
ip := dest.Address().IP()
if dest.IsTCP() {
return net.DialTCP("tcp", nil, &net.TCPAddr{
IP: ip,
Port: int(dest.Port()),
})
} else {
return net.DialUDP("udp", nil, &net.UDPAddr{
IP: ip,
Port: int(dest.Port()),
})
}
}
func (this *VMessOutboundHandler) Dispatch(target v2net.Destination, payload *alloc.Buffer, ray ray.OutboundRay) error {
defer ray.OutboundInput().Release()
defer ray.OutboundOutput().Close()
var rec *protocol.ServerSpec
var conn internet.Connection
err := retry.Timed(5, 100).On(func() error {
rec = this.serverPicker.PickServer()
rawConn, err := internet.Dial(this.meta.Address, rec.Destination(), this.meta.StreamSettings)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
log.Error("VMess|Outbound: Failed to find an available destination:", err)
return err
}
log.Info("VMess|Outbound: Tunneling request to ", target, " via ", rec.Destination)
command := protocol.RequestCommandTCP
if target.IsUDP() {
command = protocol.RequestCommandUDP
}
request := &protocol.RequestHeader{
Version: encoding.Version,
User: rec.PickUser(),
Command: command,
Address: target.Address(),
Port: target.Port(),
Option: protocol.RequestOptionChunkStream,
}
defer conn.Close()
conn.SetReusable(true)
if conn.Reusable() { // Conn reuse may be disabled on transportation layer
request.Option.Set(protocol.RequestOptionConnectionReuse)
}
input := ray.OutboundInput()
output := ray.OutboundOutput()
var requestFinish, responseFinish sync.Mutex
requestFinish.Lock()
responseFinish.Lock()
session := encoding.NewClientSession(protocol.DefaultIDHash)
go this.handleRequest(session, conn, request, payload, input, &requestFinish)
go this.handleResponse(session, conn, request, rec.Destination(), output, &responseFinish)
requestFinish.Lock()
responseFinish.Lock()
return nil
}
func socks5UDPRequest(address v2net.Destination, payload []byte) []byte {
request := make([]byte, 0, 1024)
request = append(request, 0, 0, 0)
request = appendAddress(request, address.Address())
request = address.Port().Bytes(request)
request = append(request, payload...)
return request
}
func (this *FieldRule) Apply(dest v2net.Destination) bool {
address := dest.Address()
if len(this.Domain) > 0 {
if !address.IsDomain() {
return false
}
foundMatch := false
for _, domain := range this.Domain {
if domain.Match(address.Domain()) {
foundMatch = true
break
}
}
if !foundMatch {
return false
}
}
if this.IP != nil && len(this.IP) > 0 {
if !(address.IsIPv4() || address.IsIPv6()) {
return false
}
foundMatch := false
for _, ipnet := range this.IP {
if ipnet.Contains(address.IP()) {
foundMatch = true
break
}
}
if !foundMatch {
return false
}
}
if this.Port != nil {
port := dest.Port()
if port.Value() < this.Port.From().Value() || port.Value() > this.Port.To().Value() {
return false
}
}
if this.Network != nil {
if !this.Network.HasNetwork(v2net.Network(dest.Network())) {
return false
}
}
return true
}
func DialKCP(src v2net.Address, dest v2net.Destination) (internet.Connection, error) {
udpDest := v2net.UDPDestination(dest.Address(), dest.Port())
log.Info("Dialling KCP to ", udpDest)
conn, err := internet.DialToDest(src, udpDest)
if err != nil {
return nil, err
}
cpip := NewSimpleAuthenticator()
conv := uint16(atomic.AddUint32(&globalConv, 1))
session := NewConnection(conv, conn, conn.LocalAddr().(*net.UDPAddr), conn.RemoteAddr().(*net.UDPAddr), cpip)
session.FetchInputFrom(conn)
return session, nil
}
// @Private
func (this *Router) ResolveIP(dest v2net.Destination) []v2net.Destination {
ips := this.dnsServer.Get(dest.Address().Domain())
if len(ips) == 0 {
return nil
}
dests := make([]v2net.Destination, len(ips))
for idx, ip := range ips {
if dest.IsTCP() {
dests[idx] = v2net.TCPDestination(v2net.IPAddress(ip), dest.Port())
} else {
dests[idx] = v2net.UDPDestination(v2net.IPAddress(ip), dest.Port())
}
}
return dests
}
func (this *Listener) OnReceive(payload *alloc.Buffer, src v2net.Destination) {
defer payload.Release()
if valid := this.block.Open(payload); !valid {
log.Info("KCP|Listener: discarding invalid payload from ", src)
return
}
if !this.running {
return
}
this.Lock()
defer this.Unlock()
if !this.running {
return
}
if payload.Len() < 4 {
return
}
conv := serial.BytesToUint16(payload.Value)
cmd := Command(payload.Value[2])
sourceId := src.NetAddr() + "|" + serial.Uint16ToString(conv)
conn, found := this.sessions[sourceId]
if !found {
if cmd == CommandTerminate {
return
}
log.Debug("KCP|Listener: Creating session with id(", sourceId, ") from ", src)
writer := &Writer{
id: sourceId,
hub: this.hub,
dest: src,
listener: this,
}
srcAddr := &net.UDPAddr{
IP: src.Address().IP(),
Port: int(src.Port()),
}
conn = NewConnection(conv, writer, this.localAddr, srcAddr, this.block)
select {
case this.awaitingConns <- conn:
case <-time.After(time.Second * 5):
conn.Close()
return
}
this.sessions[sourceId] = conn
}
conn.Input(payload.Value)
}
func (this *VMessOutboundHandler) startCommunicate(request *proto.RequestHeader, dest v2net.Destination, ray ray.OutboundRay, firstPacket v2net.Packet) error {
var destIP net.IP
if dest.Address().IsIPv4() || dest.Address().IsIPv6() {
destIP = dest.Address().IP()
} else {
ips, err := net.LookupIP(dest.Address().Domain())
if err != nil {
return err
}
destIP = ips[0]
}
conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
IP: destIP,
Port: int(dest.Port()),
})
if err != nil {
log.Error("Failed to open ", dest, ": ", err)
if ray != nil {
close(ray.OutboundOutput())
}
return err
}
log.Info("VMessOut: Tunneling request to ", request.Address, " via ", dest)
defer conn.Close()
input := ray.OutboundInput()
output := ray.OutboundOutput()
var requestFinish, responseFinish sync.Mutex
requestFinish.Lock()
responseFinish.Lock()
session := raw.NewClientSession(proto.DefaultIDHash)
go this.handleRequest(session, conn, request, firstPacket, input, &requestFinish)
go this.handleResponse(session, conn, request, dest, output, &responseFinish)
requestFinish.Lock()
conn.CloseWrite()
responseFinish.Lock()
return nil
}
func startCommunicate(request *protocol.VMessRequest, dest v2net.Destination, ray ray.OutboundRay, firstPacket v2net.Packet) error {
var destIp net.IP
if dest.Address().IsIPv4() || dest.Address().IsIPv6() {
destIp = dest.Address().IP()
} else {
ips, err := net.LookupIP(dest.Address().Domain())
if err != nil {
return err
}
destIp = ips[0]
}
conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
IP: destIp,
Port: int(dest.Port()),
})
if err != nil {
log.Error("Failed to open ", dest, ": ", err)
if ray != nil {
close(ray.OutboundOutput())
}
return err
}
log.Info("VMessOut: Tunneling request to ", request.Address, " via ", dest)
defer conn.Close()
input := ray.OutboundInput()
output := ray.OutboundOutput()
var requestFinish, responseFinish sync.Mutex
requestFinish.Lock()
responseFinish.Lock()
go handleRequest(conn, request, firstPacket, input, &requestFinish)
go handleResponse(conn, request, output, &responseFinish, (request.Command == protocol.CmdUDP))
requestFinish.Lock()
conn.CloseWrite()
responseFinish.Lock()
return nil
}
// @Private
func (this *FreedomConnection) ResolveIP(destination v2net.Destination) v2net.Destination {
if !destination.Address().IsDomain() {
return destination
}
ips := this.dns.Get(destination.Address().Domain())
if len(ips) == 0 {
log.Info("Freedom: DNS returns nil answer. Keep domain as is.")
return destination
}
ip := ips[dice.Roll(len(ips))]
var newDest v2net.Destination
if destination.IsTCP() {
newDest = v2net.TCPDestination(v2net.IPAddress(ip), destination.Port())
} else {
newDest = v2net.UDPDestination(v2net.IPAddress(ip), destination.Port())
}
log.Info("Freedom: Changing destination from ", destination, " to ", newDest)
return newDest
}
func socks5Request(command byte, address v2net.Destination) []byte {
request := []byte{socks5Version, command, 0}
request = appendAddress(request, address.Address())
request = address.Port().Bytes(request)
return request
}
func (this *UDPHub) WriteTo(payload []byte, dest v2net.Destination) (int, error) {
return this.conn.WriteToUDP(payload, &net.UDPAddr{
IP: dest.Address().IP(),
Port: int(dest.Port()),
})
}
func (this *PortMatcher) Apply(dest v2net.Destination) bool {
return this.port.Contains(dest.Port())
}