mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-12 23:36:43 -05:00
100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
package tun
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import (
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"context"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/log"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/signal"
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"github.com/v2fly/v2ray-core/v5/common/task"
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"github.com/v2fly/v2ray-core/v5/features/policy"
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"github.com/v2fly/v2ray-core/v5/features/routing"
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"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
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"gvisor.dev/gvisor/pkg/tcpip/stack"
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"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
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"gvisor.dev/gvisor/pkg/waiter"
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)
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const (
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rcvWnd = 0 // default settings
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maxInFlight = 2 << 10
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)
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type TCPHandler struct {
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ctx context.Context
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dispatcher routing.Dispatcher
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policyManager policy.Manager
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config *Config
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stack *stack.Stack
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}
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func (h *TCPHandler) SetHandler() {
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tcpForwarder := tcp.NewForwarder(h.stack, rcvWnd, maxInFlight, func(r *tcp.ForwarderRequest) {
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wg := new(waiter.Queue)
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linkedEndpoint, err := r.CreateEndpoint(wg)
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if err != nil {
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r.Complete(true)
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return
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}
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defer r.Complete(false)
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// TODO: set sockopt
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h.handle(gonet.NewTCPConn(wg, linkedEndpoint))
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})
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h.stack.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)
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}
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func (h *TCPHandler) handle(conn *gonet.TCPConn) error {
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sessionPolicy := h.policyManager.ForLevel(h.config.UserLevel)
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addr := conn.RemoteAddr()
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dest := net.DestinationFromAddr(addr)
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ctx := log.ContextWithAccessMessage(h.ctx, &log.AccessMessage{
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From: addr,
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To: dest,
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Status: log.AccessAccepted,
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Reason: "",
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})
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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link, err := h.dispatcher.Dispatch(ctx, dest)
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if err != nil {
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return newError("failed to dispatch").Base(err)
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}
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responseDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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if err := buf.Copy(link.Reader, buf.NewWriter(conn), buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transport all TCP response").Base(err)
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}
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return nil
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}
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requestDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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if err := buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transport all TCP request").Base(err)
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}
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return nil
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}
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requestDoneAndCloseWriter := task.OnSuccess(requestDone, task.Close(link.Writer))
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if err := task.Run(h.ctx, requestDoneAndCloseWriter, responseDone); err != nil {
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common.Interrupt(link.Reader)
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common.Interrupt(link.Writer)
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return newError("connection ends").Base(err)
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}
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return nil
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}
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