mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-27 12:05:40 +00:00
71029cea2d
This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>
104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package tstun
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"os"
|
|
"os/exec"
|
|
"strings"
|
|
"syscall"
|
|
|
|
"tailscale.com/types/logger"
|
|
"tailscale.com/version/distro"
|
|
)
|
|
|
|
func init() {
|
|
tunDiagnoseFailure = diagnoseLinuxTUNFailure
|
|
}
|
|
|
|
func diagnoseLinuxTUNFailure(tunName string, logf logger.Logf, createErr error) {
|
|
if errors.Is(createErr, syscall.EBUSY) {
|
|
logf("TUN device %s is busy; another process probably still has it open (from old version of Tailscale that had a bug)", tunName)
|
|
logf("To fix, kill the process that has it open. Find with:\n\n$ sudo lsof -n /dev/net/tun\n\n")
|
|
logf("... and then kill those PID(s)")
|
|
return
|
|
}
|
|
|
|
var un syscall.Utsname
|
|
err := syscall.Uname(&un)
|
|
if err != nil {
|
|
logf("no TUN, and failed to look up kernel version: %v", err)
|
|
return
|
|
}
|
|
kernel := utsReleaseField(&un)
|
|
logf("Linux kernel version: %s", kernel)
|
|
|
|
modprobeOut, err := exec.Command("/sbin/modprobe", "tun").CombinedOutput()
|
|
if err == nil {
|
|
logf("'modprobe tun' successful")
|
|
// Either tun is currently loaded, or it's statically
|
|
// compiled into the kernel (which modprobe checks
|
|
// with /lib/modules/$(uname -r)/modules.builtin)
|
|
//
|
|
// So if there's a problem at this point, it's
|
|
// probably because /dev/net/tun doesn't exist.
|
|
const dev = "/dev/net/tun"
|
|
if fi, err := os.Stat(dev); err != nil {
|
|
logf("tun module loaded in kernel, but %s does not exist", dev)
|
|
} else {
|
|
logf("%s: %v", dev, fi.Mode())
|
|
}
|
|
|
|
// We failed to find why it failed. Just let our
|
|
// caller report the error it got from wireguard-go.
|
|
return
|
|
}
|
|
logf("is CONFIG_TUN enabled in your kernel? `modprobe tun` failed with: %s", modprobeOut)
|
|
|
|
switch distro.Get() {
|
|
case distro.Debian:
|
|
dpkgOut, err := exec.Command("dpkg", "-S", "kernel/drivers/net/tun.ko").CombinedOutput()
|
|
if len(bytes.TrimSpace(dpkgOut)) == 0 || err != nil {
|
|
logf("tun module not loaded nor found on disk")
|
|
return
|
|
}
|
|
if !bytes.Contains(dpkgOut, []byte(kernel)) {
|
|
logf("kernel/drivers/net/tun.ko found on disk, but not for current kernel; are you in middle of a system update and haven't rebooted? found: %s", dpkgOut)
|
|
}
|
|
case distro.Arch:
|
|
findOut, err := exec.Command("find", "/lib/modules/", "-path", "*/net/tun.ko*").CombinedOutput()
|
|
if len(bytes.TrimSpace(findOut)) == 0 || err != nil {
|
|
logf("tun module not loaded nor found on disk")
|
|
return
|
|
}
|
|
if !bytes.Contains(findOut, []byte(kernel)) {
|
|
logf("kernel/drivers/net/tun.ko found on disk, but not for current kernel; are you in middle of a system update and haven't rebooted? found: %s", findOut)
|
|
}
|
|
case distro.OpenWrt:
|
|
out, err := exec.Command("opkg", "list-installed").CombinedOutput()
|
|
if err != nil {
|
|
logf("error querying OpenWrt installed packages: %s", out)
|
|
return
|
|
}
|
|
for _, pkg := range []string{"kmod-tun", "ca-bundle"} {
|
|
if !bytes.Contains(out, []byte(pkg+" - ")) {
|
|
logf("Missing required package %s; run: opkg install %s", pkg, pkg)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func utsReleaseField(u *syscall.Utsname) string {
|
|
var sb strings.Builder
|
|
for _, v := range u.Release {
|
|
if v == 0 {
|
|
break
|
|
}
|
|
sb.WriteByte(byte(v))
|
|
}
|
|
return strings.TrimSpace(sb.String())
|
|
}
|