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loopback outbound, allow you to redirect connection to the dispatcher…
… again (#770) * Added Loop back proxy * Added json processing for lo proxy * Fix bug for lo proxy * Fix bug for lo proxy * rename the outbound name * Loopback: update naming and fix lint issues * Chore: change lo to loopback Co-authored-by: kslr <kslrwang@gmail.com> Co-authored-by: loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>
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package conf | ||
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import ( | ||
"github.com/golang/protobuf/proto" | ||
"github.com/v2fly/v2ray-core/v4/proxy/loopback" | ||
) | ||
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type LoopbackConfig struct { | ||
InboundTag string `json:"inboundTag"` | ||
} | ||
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func (l LoopbackConfig) Build() (proto.Message, error) { | ||
return &loopback.Config{InboundTag: l.InboundTag}, nil | ||
} |
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package loopback | ||
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//go:generate go run github.com/v2fly/v2ray-core/v4/common/errors/errorgen |
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syntax = "proto3"; | ||
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package v2ray.core.proxy.loopback; | ||
option csharp_namespace = "V2Ray.Core.Proxy.Loopback"; | ||
option go_package = "github.com/v2fly/v2ray-core/v4/proxy/loopback"; | ||
option java_package = "com.v2ray.core.proxy.loopback"; | ||
option java_multiple_files = true; | ||
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message Config { | ||
string inbound_tag = 1; | ||
} |
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package loopback | ||
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import "github.com/v2fly/v2ray-core/v4/common/errors" | ||
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type errPathObjHolder struct{} | ||
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func newError(values ...interface{}) *errors.Error { | ||
return errors.New(values...).WithPathObj(errPathObjHolder{}) | ||
} |
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// +build !confonly | ||
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package loopback | ||
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import ( | ||
"context" | ||
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core "github.com/v2fly/v2ray-core/v4" | ||
"github.com/v2fly/v2ray-core/v4/common" | ||
"github.com/v2fly/v2ray-core/v4/common/buf" | ||
"github.com/v2fly/v2ray-core/v4/common/net" | ||
"github.com/v2fly/v2ray-core/v4/common/retry" | ||
"github.com/v2fly/v2ray-core/v4/common/session" | ||
"github.com/v2fly/v2ray-core/v4/common/task" | ||
"github.com/v2fly/v2ray-core/v4/features/routing" | ||
"github.com/v2fly/v2ray-core/v4/transport" | ||
"github.com/v2fly/v2ray-core/v4/transport/internet" | ||
) | ||
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type Loopback struct { | ||
config *Config | ||
dispatcherInstance routing.Dispatcher | ||
} | ||
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func (l *Loopback) Process(ctx context.Context, link *transport.Link, _ internet.Dialer) error { | ||
outbound := session.OutboundFromContext(ctx) | ||
if outbound == nil || !outbound.Target.IsValid() { | ||
return newError("target not specified.") | ||
} | ||
destination := outbound.Target | ||
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newError("opening connection to ", destination).WriteToLog(session.ExportIDToError(ctx)) | ||
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input := link.Reader | ||
output := link.Writer | ||
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var conn internet.Connection | ||
err := retry.ExponentialBackoff(5, 100).On(func() error { | ||
dialDest := destination | ||
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content := new(session.Content) | ||
content.SkipDNSResolve = true | ||
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ctx = session.ContextWithContent(ctx, content) | ||
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inbound := session.InboundFromContext(ctx) | ||
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inbound.Tag = l.config.InboundTag | ||
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ctx = session.ContextWithInbound(ctx, inbound) | ||
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rawConn, err := l.dispatcherInstance.Dispatch(ctx, dialDest) | ||
if err != nil { | ||
return err | ||
} | ||
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var readerOpt net.ConnectionOption | ||
if dialDest.Network == net.Network_TCP { | ||
readerOpt = net.ConnectionOutputMulti(rawConn.Reader) | ||
} else { | ||
readerOpt = net.ConnectionOutputMultiUDP(rawConn.Reader) | ||
} | ||
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conn = net.NewConnection(net.ConnectionInputMulti(rawConn.Writer), readerOpt) | ||
return nil | ||
}) | ||
if err != nil { | ||
return newError("failed to open connection to ", destination).Base(err) | ||
} | ||
defer conn.Close() | ||
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requestDone := func() error { | ||
var writer buf.Writer | ||
if destination.Network == net.Network_TCP { | ||
writer = buf.NewWriter(conn) | ||
} else { | ||
writer = &buf.SequentialWriter{Writer: conn} | ||
} | ||
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if err := buf.Copy(input, writer); err != nil { | ||
return newError("failed to process request").Base(err) | ||
} | ||
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return nil | ||
} | ||
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responseDone := func() error { | ||
var reader buf.Reader | ||
if destination.Network == net.Network_TCP { | ||
reader = buf.NewReader(conn) | ||
} else { | ||
reader = buf.NewPacketReader(conn) | ||
} | ||
if err := buf.Copy(reader, output); err != nil { | ||
return newError("failed to process response").Base(err) | ||
} | ||
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return nil | ||
} | ||
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if err := task.Run(ctx, requestDone, task.OnSuccess(responseDone, task.Close(output))); err != nil { | ||
return newError("connection ends").Base(err) | ||
} | ||
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return nil | ||
} | ||
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func (l *Loopback) init(config *Config, dispatcherInstance routing.Dispatcher) error { | ||
l.dispatcherInstance = dispatcherInstance | ||
l.config = config | ||
return nil | ||
} | ||
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func init() { | ||
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { | ||
l := new(Loopback) | ||
err := core.RequireFeatures(ctx, func(dispatcherInstance routing.Dispatcher) error { | ||
return l.init(config.(*Config), dispatcherInstance) | ||
}) | ||
return l, err | ||
})) | ||
} |