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dokodemo.go
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dokodemo.go
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package dokodemo
//go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg dokodemo -path Proxy,Dokodemo
import (
"context"
"time"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/common/signal"
"v2ray.com/core/proxy"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/internet/udp"
)
type DokodemoDoor struct {
policyManager core.PolicyManager
config *Config
address net.Address
port net.Port
v *core.Instance
}
func New(ctx context.Context, config *Config) (*DokodemoDoor, error) {
if config.NetworkList == nil || config.NetworkList.Size() == 0 {
return nil, newError("no network specified")
}
v := core.MustFromContext(ctx)
d := &DokodemoDoor{
config: config,
address: config.GetPredefinedAddress(),
port: net.Port(config.Port),
policyManager: v.PolicyManager(),
}
return d, nil
}
func (d *DokodemoDoor) Network() net.NetworkList {
return *(d.config.NetworkList)
}
func (d *DokodemoDoor) policy() core.Policy {
config := d.config
p := d.policyManager.ForLevel(config.UserLevel)
if config.Timeout > 0 && config.UserLevel == 0 {
p.Timeouts.ConnectionIdle = time.Duration(config.Timeout) * time.Second
}
return p
}
func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher core.Dispatcher) error {
newError("processing connection from: ", conn.RemoteAddr()).AtDebug().WithContext(ctx).WriteToLog()
dest := net.Destination{
Network: network,
Address: d.address,
Port: d.port,
}
if d.config.FollowRedirect {
if origDest, ok := proxy.OriginalTargetFromContext(ctx); ok {
dest = origDest
}
}
if !dest.IsValid() || dest.Address == nil {
return newError("unable to get destination")
}
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, d.policy().Timeouts.ConnectionIdle)
inboundRay, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return newError("failed to dispatch request").Base(err)
}
requestDone := signal.ExecuteAsync(func() error {
defer inboundRay.InboundInput().Close()
defer timer.SetTimeout(d.policy().Timeouts.DownlinkOnly)
chunkReader := buf.NewReader(conn)
if err := buf.Copy(chunkReader, inboundRay.InboundInput(), buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport request").Base(err)
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer timer.SetTimeout(d.policy().Timeouts.UplinkOnly)
var writer buf.Writer
if network == net.Network_TCP {
writer = buf.NewWriter(conn)
} else {
//if we are in TPROXY mode, use linux's udp forging functionality
if !d.config.FollowRedirect {
writer = buf.NewSequentialWriter(conn)
} else {
srca := net.UDPAddr{IP: dest.Address.IP(), Port: int(dest.Port.Value())}
origsend, err := udp.TransmitSocket(&srca, conn.RemoteAddr())
if err != nil {
return err
}
writer = buf.NewSequentialWriter(origsend)
}
}
if err := buf.Copy(inboundRay.InboundOutput(), writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport response").Base(err)
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
inboundRay.InboundInput().CloseError()
inboundRay.InboundOutput().CloseError()
return newError("connection ends").Base(err)
}
return nil
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
}