mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-25 19:15:34 +00:00
d9eca20ee2
This package contains platform-independent abstractions for fetching information about an open TCP connection. Updates #8413 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I236657b1060d7e6a45efc7a2f6aacf474547a2fe
34 lines
608 B
Go
34 lines
608 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package tcpinfo
|
|
|
|
import (
|
|
"net"
|
|
"time"
|
|
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
func rttImpl(conn *net.TCPConn) (time.Duration, error) {
|
|
rawConn, err := conn.SyscallConn()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
var (
|
|
tcpInfo *unix.TCPInfo
|
|
sysErr error
|
|
)
|
|
err = rawConn.Control(func(fd uintptr) {
|
|
tcpInfo, sysErr = unix.GetsockoptTCPInfo(int(fd), unix.IPPROTO_TCP, unix.TCP_INFO)
|
|
})
|
|
if err != nil {
|
|
return 0, err
|
|
} else if sysErr != nil {
|
|
return 0, sysErr
|
|
}
|
|
|
|
return time.Duration(tcpInfo.Rtt) * time.Microsecond, nil
|
|
}
|