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Fix gLazyConn race

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世界 2025-06-13 11:35:09 +08:00
parent 494b0ef858
commit 3df19f464e
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GPG key ID: CD109927C34A63C4
1 changed files with 64 additions and 59 deletions
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59
stack_gvisor_lazy.go
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@ -6,6 +6,7 @@ import (
"context"
"net"
"os"
"sync"
"time"
"github.com/sagernet/gvisor/pkg/tcpip"
@ -23,13 +24,19 @@ type gLazyConn struct {
request *tcp.ForwarderRequest
localAddr net.Addr
remoteAddr net.Addr
handshakeAccess sync.Mutex
handshakeDone bool
handshakeErr error
}
func (c *gLazyConn) HandshakeContext(ctx context.Context) error {
if c.handshakeDone {
return nil
return c.handshakeErr
}
c.handshakeAccess.Lock()
defer c.handshakeAccess.Unlock()
if c.handshakeDone {
return c.handshakeErr
}
defer func() {
c.handshakeDone = true
@ -64,6 +71,11 @@ func (c *gLazyConn) HandshakeContext(ctx context.Context) error {
}
func (c *gLazyConn) HandshakeFailure(err error) error {
if c.handshakeDone {
return os.ErrInvalid
}
c.handshakeAccess.Lock()
defer c.handshakeAccess.Unlock()
if c.handshakeDone {
return os.ErrInvalid
}
@ -78,26 +90,18 @@ func (c *gLazyConn) HandshakeSuccess() error {
}
func (c *gLazyConn) Read(b []byte) (n int, err error) {
if !c.handshakeDone {
err = c.HandshakeContext(context.Background())
if err != nil {
return
}
} else if c.handshakeErr != nil {
return 0, c.handshakeErr
}
return c.tcpConn.Read(b)
}
func (c *gLazyConn) Write(b []byte) (n int, err error) {
if !c.handshakeDone {
err = c.HandshakeContext(context.Background())
if err != nil {
return
}
} else if c.handshakeErr != nil {
return 0, c.handshakeErr
}
return c.tcpConn.Write(b)
}
@ -110,79 +114,80 @@ func (c *gLazyConn) RemoteAddr() net.Addr {
}
func (c *gLazyConn) SetDeadline(t time.Time) error {
if !c.handshakeDone {
err := c.HandshakeContext(context.Background())
if err != nil {
return err
}
} else if c.handshakeErr != nil {
return c.handshakeErr
}
return c.tcpConn.SetDeadline(t)
}
func (c *gLazyConn) SetReadDeadline(t time.Time) error {
if !c.handshakeDone {
err := c.HandshakeContext(context.Background())
if err != nil {
return err
}
} else if c.handshakeErr != nil {
return c.handshakeErr
}
return c.tcpConn.SetReadDeadline(t)
}
func (c *gLazyConn) SetWriteDeadline(t time.Time) error {
if !c.handshakeDone {
err := c.HandshakeContext(context.Background())
if err != nil {
return err
}
} else if c.handshakeErr != nil {
return c.handshakeErr
}
return c.tcpConn.SetWriteDeadline(t)
}
func (c *gLazyConn) Close() error {
if !c.handshakeDone {
c.handshakeAccess.Lock()
if !c.handshakeDone {
c.request.Complete(true)
c.handshakeErr = net.ErrClosed
c.handshakeDone = true
return nil
} else if c.handshakeErr != nil {
return nil
}
c.handshakeAccess.Unlock()
}
return c.tcpConn.Close()
}
func (c *gLazyConn) CloseRead() error {
if !c.handshakeDone {
c.handshakeAccess.Lock()
if !c.handshakeDone {
c.request.Complete(true)
c.handshakeErr = net.ErrClosed
c.handshakeDone = true
return nil
} else if c.handshakeErr != nil {
return nil
}
c.handshakeAccess.Unlock()
}
return c.tcpConn.CloseRead()
}
func (c *gLazyConn) CloseWrite() error {
if !c.handshakeDone {
c.handshakeAccess.Lock()
if !c.handshakeDone {
c.request.Complete(true)
c.handshakeErr = net.ErrClosed
c.handshakeDone = true
return nil
} else if c.handshakeErr != nil {
return nil
}
c.handshakeAccess.Unlock()
}
return c.tcpConn.CloseRead()
}
func (c *gLazyConn) ReaderReplaceable() bool {
c.handshakeAccess.Lock()
defer c.handshakeAccess.Unlock()
return c.handshakeDone && c.handshakeErr == nil
}
func (c *gLazyConn) WriterReplaceable() bool {
c.handshakeAccess.Lock()
defer c.handshakeAccess.Unlock()
return c.handshakeDone && c.handshakeErr == nil
}