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handler.go
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handler.go
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package outbound
import (
"context"
"v2ray.com/core"
"v2ray.com/core/app/proxyman"
"v2ray.com/core/common"
"v2ray.com/core/common/mux"
"v2ray.com/core/common/net"
"v2ray.com/core/common/session"
"v2ray.com/core/features/outbound"
"v2ray.com/core/proxy"
"v2ray.com/core/transport"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/pipe"
)
// Handler is an implements of outbound.Handler.
type Handler struct {
tag string
senderSettings *proxyman.SenderConfig
streamSettings *internet.MemoryStreamConfig
proxy proxy.Outbound
outboundManager outbound.Manager
mux *mux.ClientManager
}
// NewHandler create a new Handler based on the given configuration.
func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbound.Handler, error) {
v := core.MustFromContext(ctx)
h := &Handler{
tag: config.Tag,
outboundManager: v.GetFeature(outbound.ManagerType()).(outbound.Manager),
}
if config.SenderSettings != nil {
senderSettings, err := config.SenderSettings.GetInstance()
if err != nil {
return nil, err
}
switch s := senderSettings.(type) {
case *proxyman.SenderConfig:
h.senderSettings = s
mss, err := internet.ToMemoryStreamConfig(s.StreamSettings)
if err != nil {
return nil, newError("failed to parse stream settings").Base(err).AtWarning()
}
h.streamSettings = mss
default:
return nil, newError("settings is not SenderConfig")
}
}
proxyConfig, err := config.ProxySettings.GetInstance()
if err != nil {
return nil, err
}
rawProxyHandler, err := common.CreateObject(ctx, proxyConfig)
if err != nil {
return nil, err
}
proxyHandler, ok := rawProxyHandler.(proxy.Outbound)
if !ok {
return nil, newError("not an outbound handler")
}
if h.senderSettings != nil && h.senderSettings.MultiplexSettings != nil && h.senderSettings.MultiplexSettings.Enabled {
config := h.senderSettings.MultiplexSettings
if config.Concurrency < 1 || config.Concurrency > 1024 {
return nil, newError("invalid mux concurrency: ", config.Concurrency).AtWarning()
}
h.mux = &mux.ClientManager{
Picker: &mux.IncrementalWorkerPicker{
Factory: &mux.DialingWorkerFactory{
Proxy: proxyHandler,
Dialer: h,
Strategy: mux.ClientStrategy{
MaxConcurrency: config.Concurrency,
MaxConnection: 128,
},
},
},
}
}
h.proxy = proxyHandler
return h, nil
}
// Tag implements outbound.Handler.
func (h *Handler) Tag() string {
return h.tag
}
// Dispatch implements proxy.Outbound.Dispatch.
func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
if h.mux != nil {
if err := h.mux.Dispatch(ctx, link); err != nil {
newError("failed to process mux outbound traffic").Base(err).WriteToLog(session.ExportIDToError(ctx))
common.Interrupt(link.Writer)
}
} else {
if err := h.proxy.Process(ctx, link, h); err != nil {
// Ensure outbound ray is properly closed.
newError("failed to process outbound traffic").Base(err).WriteToLog(session.ExportIDToError(ctx))
common.Interrupt(link.Writer)
} else {
common.Must(common.Close(link.Writer))
}
common.Interrupt(link.Reader)
}
}
// Address implements internet.Dialer.
func (h *Handler) Address() net.Address {
if h.senderSettings == nil || h.senderSettings.Via == nil {
return nil
}
return h.senderSettings.Via.AsAddress()
}
// Dial implements internet.Dialer.
func (h *Handler) Dial(ctx context.Context, dest net.Destination) (internet.Connection, error) {
if h.senderSettings != nil {
if h.senderSettings.ProxySettings.HasTag() {
tag := h.senderSettings.ProxySettings.Tag
handler := h.outboundManager.GetHandler(tag)
if handler != nil {
newError("proxying to ", tag, " for dest ", dest).AtDebug().WriteToLog(session.ExportIDToError(ctx))
ctx = session.ContextWithOutbound(ctx, &session.Outbound{
Target: dest,
})
opts := pipe.OptionsFromContext(ctx)
uplinkReader, uplinkWriter := pipe.New(opts...)
downlinkReader, downlinkWriter := pipe.New(opts...)
go handler.Dispatch(ctx, &transport.Link{Reader: uplinkReader, Writer: downlinkWriter})
return net.NewConnection(net.ConnectionInputMulti(uplinkWriter), net.ConnectionOutputMulti(downlinkReader)), nil
}
newError("failed to get outbound handler with tag: ", tag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
}
if h.senderSettings.Via != nil {
outbound := session.OutboundFromContext(ctx)
if outbound == nil {
outbound = new(session.Outbound)
ctx = session.ContextWithOutbound(ctx, outbound)
}
outbound.Gateway = h.senderSettings.Via.AsAddress()
}
}
return internet.Dial(ctx, dest, h.streamSettings)
}
// GetOutbound implements proxy.GetOutbound.
func (h *Handler) GetOutbound() proxy.Outbound {
return h.proxy
}
// Start implements common.Runnable.
func (h *Handler) Start() error {
return nil
}
// Close implements common.Closable.
func (h *Handler) Close() error {
common.Close(h.mux)
return nil
}