mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
146 lines
3.8 KiB
Go
146 lines
3.8 KiB
Go
package freedom
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import (
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"io"
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"v2ray.com/core/app"
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"v2ray.com/core/app/dns"
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"v2ray.com/core/common/alloc"
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"v2ray.com/core/common/dice"
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v2io "v2ray.com/core/common/io"
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"v2ray.com/core/common/loader"
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"v2ray.com/core/common/log"
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v2net "v2ray.com/core/common/net"
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"v2ray.com/core/common/retry"
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"v2ray.com/core/proxy"
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"v2ray.com/core/proxy/registry"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/internet/tcp"
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"v2ray.com/core/transport/ray"
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)
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type FreedomConnection struct {
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domainStrategy Config_DomainStrategy
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timeout uint32
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dns dns.Server
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meta *proxy.OutboundHandlerMeta
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}
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func NewFreedomConnection(config *Config, space app.Space, meta *proxy.OutboundHandlerMeta) *FreedomConnection {
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f := &FreedomConnection{
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domainStrategy: config.DomainStrategy,
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timeout: config.Timeout,
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meta: meta,
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}
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space.InitializeApplication(func() error {
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if config.DomainStrategy == Config_USE_IP {
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if !space.HasApp(dns.APP_ID) {
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log.Error("Freedom: DNS server is not found in the space.")
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return app.ErrMissingApplication
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}
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f.dns = space.GetApp(dns.APP_ID).(dns.Server)
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}
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return nil
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})
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return f
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}
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// Private: Visible for testing.
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func (this *FreedomConnection) ResolveIP(destination v2net.Destination) v2net.Destination {
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if !destination.Address.Family().IsDomain() {
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return destination
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}
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ips := this.dns.Get(destination.Address.Domain())
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if len(ips) == 0 {
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log.Info("Freedom: DNS returns nil answer. Keep domain as is.")
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return destination
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}
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ip := ips[dice.Roll(len(ips))]
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var newDest v2net.Destination
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if destination.Network == v2net.Network_TCP {
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newDest = v2net.TCPDestination(v2net.IPAddress(ip), destination.Port)
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} else {
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newDest = v2net.UDPDestination(v2net.IPAddress(ip), destination.Port)
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}
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log.Info("Freedom: Changing destination from ", destination, " to ", newDest)
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return newDest
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}
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func (this *FreedomConnection) Dispatch(destination v2net.Destination, payload *alloc.Buffer, ray ray.OutboundRay) error {
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log.Info("Freedom: Opening connection to ", destination)
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defer payload.Release()
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defer ray.OutboundInput().Release()
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defer ray.OutboundOutput().Close()
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var conn internet.Connection
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if this.domainStrategy == Config_USE_IP && destination.Address.Family().IsDomain() {
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destination = this.ResolveIP(destination)
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}
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err := retry.ExponentialBackoff(5, 100).On(func() error {
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rawConn, err := internet.Dial(this.meta.Address, destination, this.meta.GetDialerOptions())
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if err != nil {
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return err
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}
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conn = rawConn
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return nil
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})
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if err != nil {
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log.Warning("Freedom: Failed to open connection to ", destination, ": ", err)
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return err
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}
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defer conn.Close()
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input := ray.OutboundInput()
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output := ray.OutboundOutput()
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if !payload.IsEmpty() {
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conn.Write(payload.Value)
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}
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go func() {
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v2writer := v2io.NewAdaptiveWriter(conn)
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defer v2writer.Release()
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v2io.Pipe(input, v2writer)
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if tcpConn, ok := conn.(*tcp.RawConnection); ok {
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tcpConn.CloseWrite()
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}
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}()
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var reader io.Reader = conn
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timeout := this.timeout
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if destination.Network == v2net.Network_UDP {
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timeout = 16
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}
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if timeout > 0 {
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reader = v2net.NewTimeOutReader(timeout /* seconds */, conn)
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}
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v2reader := v2io.NewAdaptiveReader(reader)
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v2io.Pipe(v2reader, output)
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v2reader.Release()
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ray.OutboundOutput().Close()
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return nil
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}
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type FreedomFactory struct{}
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func (this *FreedomFactory) StreamCapability() v2net.NetworkList {
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return v2net.NetworkList{
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Network: []v2net.Network{v2net.Network_RawTCP},
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}
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}
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func (this *FreedomFactory) Create(space app.Space, config interface{}, meta *proxy.OutboundHandlerMeta) (proxy.OutboundHandler, error) {
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return NewFreedomConnection(config.(*Config), space, meta), nil
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}
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func init() {
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registry.MustRegisterOutboundHandlerCreator(loader.GetType(new(Config)), new(FreedomFactory))
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}
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