mirror of
https://github.com/SagerNet/sing-box.git
synced 2025-01-31 13:16:53 +00:00
41 lines
790 B
Go
41 lines
790 B
Go
package tf
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import (
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"context"
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"net"
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"time"
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"github.com/sagernet/sing/common/control"
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"golang.org/x/sys/unix"
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)
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func writeAndWaitAck(ctx context.Context, conn *net.TCPConn, payload []byte, fallbackDelay time.Duration) error {
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_, err := conn.Write(payload)
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if err != nil {
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return err
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}
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return control.Conn(conn, func(fd uintptr) error {
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start := time.Now()
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for {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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tcpInfo, err := unix.GetsockoptTCPInfo(int(fd), unix.IPPROTO_TCP, unix.TCP_INFO)
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if err != nil {
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return err
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}
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if tcpInfo.Unacked == 0 {
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if time.Since(start) <= 20*time.Millisecond {
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// under transparent proxy
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time.Sleep(fallbackDelay)
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}
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return nil
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}
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time.Sleep(10 * time.Millisecond)
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}
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})
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}
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