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tailscale/wgengine/netstack/netstack_userping.go

73 lines
2.0 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build !darwin && !ios
package netstack
import (
"errors"
"net/netip"
"os"
"os/exec"
"runtime"
"time"
"tailscale.com/version/distro"
)
// setAmbientCapsRaw is non-nil on Linux for Synology, to run ping with
// CAP_NET_RAW from tailscaled's binary.
var setAmbientCapsRaw func(*exec.Cmd)
var isSynology = runtime.GOOS == "linux" && distro.Get() == distro.Synology
// sendOutboundUserPing sends a non-privileged ICMP (or ICMPv6) ping to dstIP with the given timeout.
func (ns *Impl) sendOutboundUserPing(dstIP netip.Addr, timeout time.Duration) error {
var err error
switch runtime.GOOS {
case "windows":
var out []byte
out, err = exec.Command("ping", "-n", "1", "-w", "3000", dstIP.String()).CombinedOutput()
if err == nil && !windowsPingOutputIsSuccess(dstIP, out) {
// TODO(bradfitz,nickkhyl): return the actual ICMP error we heard back to the caller?
// For now we just drop it.
err = errors.New("unsuccessful ICMP reply received")
}
case "freebsd":
// Note: 2000 ms is actually 1 second + 2,000
// milliseconds extra for 3 seconds total.
// See https://github.com/tailscale/tailscale/pull/3753 for details.
ping := "ping"
if dstIP.Is6() {
ping = "ping6"
}
err = exec.Command(ping, "-c", "1", "-W", "2000", dstIP.String()).Run()
case "openbsd":
ping := "ping"
if dstIP.Is6() {
ping = "ping6"
}
err = exec.Command(ping, "-c", "1", "-w", "3", dstIP.String()).Run()
case "android":
ping := "/system/bin/ping"
if dstIP.Is6() {
ping = "/system/bin/ping6"
}
err = exec.Command(ping, "-c", "1", "-w", "3", dstIP.String()).Run()
default:
ping := "ping"
if isSynology {
ping = "/bin/ping"
}
cmd := exec.Command(ping, "-c", "1", "-W", "3", dstIP.String())
if isSynology && os.Getuid() != 0 {
// On DSM7 we run as non-root and need to pass
// CAP_NET_RAW if our binary has it.
setAmbientCapsRaw(cmd)
}
err = cmd.Run()
}
return err
}