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run.go
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run.go
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package wireguard
import (
"context"
"errors"
"fmt"
"net"
"github.com/qdm12/gluetun/internal/netlink"
"golang.org/x/sys/unix"
"golang.zx2c4.com/wireguard/conn"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/ipc"
"golang.zx2c4.com/wireguard/tun"
"golang.zx2c4.com/wireguard/wgctrl"
)
var (
ErrDetectKernel = errors.New("cannot detect Kernel support")
ErrCreateTun = errors.New("cannot create TUN device")
ErrAddLink = errors.New("cannot add Wireguard link")
ErrFindLink = errors.New("cannot find link")
ErrFindDevice = errors.New("cannot find Wireguard device")
ErrUAPISocketOpening = errors.New("cannot open UAPI socket")
ErrWgctrlOpen = errors.New("cannot open wgctrl")
ErrUAPIListen = errors.New("cannot listen on UAPI socket")
ErrAddAddress = errors.New("cannot add address to wireguard interface")
ErrConfigure = errors.New("cannot configure wireguard interface")
ErrDeviceInfo = errors.New("cannot get wireguard device information")
ErrIfaceUp = errors.New("cannot set the interface to UP")
ErrRouteAdd = errors.New("cannot add route for interface")
ErrDeviceWaited = errors.New("device waited for")
ErrKernelSupport = errors.New("kernel does not support Wireguard")
)
// See https://git.zx2c4.com/wireguard-go/tree/main.go
func (w *Wireguard) Run(ctx context.Context, waitError chan<- error, ready chan<- struct{}) {
kernelSupported, err := w.netlink.IsWireguardSupported()
if err != nil {
waitError <- fmt.Errorf("%w: %s", ErrDetectKernel, err)
return
}
setupFunction := setupUserSpace
switch w.settings.Implementation {
case "auto": //nolint:goconst
if !kernelSupported {
w.logger.Info("Using userspace implementation since Kernel support does not exist")
break
}
w.logger.Info("Using available kernelspace implementation")
setupFunction = setupKernelSpace
case "userspace":
case "kernelspace":
if !kernelSupported {
waitError <- fmt.Errorf("%w", ErrKernelSupport)
return
}
setupFunction = setupKernelSpace
default:
panic(fmt.Sprintf("unknown implementation %q", w.settings.Implementation))
}
client, err := wgctrl.New()
if err != nil {
waitError <- fmt.Errorf("%w: %s", ErrWgctrlOpen, err)
return
}
var closers closers
closers.add("closing controller client", stepOne, client.Close)
defer closers.cleanup(w.logger)
link, waitAndCleanup, err := setupFunction(ctx,
w.settings.InterfaceName, w.netlink, w.settings.MTU, &closers, w.logger)
if err != nil {
waitError <- err
return
}
err = w.addAddresses(link, w.settings.Addresses)
if err != nil {
waitError <- fmt.Errorf("%w: %s", ErrAddAddress, err)
return
}
w.logger.Info("Connecting to " + w.settings.Endpoint.String())
err = configureDevice(client, w.settings)
if err != nil {
waitError <- fmt.Errorf("%w: %s", ErrConfigure, err)
return
}
linkIndex, err := w.netlink.LinkSetUp(link)
if err != nil {
waitError <- fmt.Errorf("%w: %s", ErrIfaceUp, err)
return
}
link.Index = linkIndex
closers.add("shutting down link", stepFour, func() error {
return w.netlink.LinkSetDown(link)
})
err = w.addRoutes(link, w.settings.AllowedIPs, w.settings.FirewallMark)
if err != nil {
waitError <- fmt.Errorf("%w: %s", ErrRouteAdd, err)
return
}
if *w.settings.IPv6 {
// requires net.ipv6.conf.all.disable_ipv6=0
ruleCleanup6, err := w.addRule(w.settings.RulePriority,
w.settings.FirewallMark, unix.AF_INET6)
if err != nil {
waitError <- fmt.Errorf("adding IPv6 rule: %w", err)
return
}
closers.add("removing IPv6 rule", stepOne, ruleCleanup6)
}
ruleCleanup, err := w.addRule(w.settings.RulePriority,
w.settings.FirewallMark, unix.AF_INET)
if err != nil {
waitError <- fmt.Errorf("adding IPv4 rule: %w", err)
return
}
closers.add("removing IPv4 rule", stepOne, ruleCleanup)
w.logger.Info("Wireguard setup is complete. " +
"Note Wireguard is a silent protocol and it may or may not work, without giving any error message. " +
"Typically i/o timeout errors indicate the Wireguard connection is not working.")
ready <- struct{}{}
waitError <- waitAndCleanup()
}
type waitAndCleanupFunc func() error
func setupKernelSpace(ctx context.Context,
interfaceName string, netLinker NetLinker, mtu uint16,
closers *closers, logger Logger) (
link netlink.Link, waitAndCleanup waitAndCleanupFunc, err error) {
link = netlink.Link{
Type: "wireguard",
Name: interfaceName,
MTU: mtu,
}
links, err := netLinker.LinkList()
if err != nil {
return link, nil, fmt.Errorf("listing links: %w", err)
}
// Cleanup any previous Wireguard interface with the same name
// See https://github.com/qdm12/gluetun/issues/1669
for _, link := range links {
if link.Type == "wireguard" && link.Name == interfaceName {
err = netLinker.LinkDel(link)
if err != nil {
return link, nil, fmt.Errorf("deleting previous Wireguard link %s: %w",
interfaceName, err)
}
}
}
linkIndex, err := netLinker.LinkAdd(link)
if err != nil {
return link, nil, fmt.Errorf("%w: %s", ErrAddLink, err)
}
link.Index = linkIndex
closers.add("deleting link", stepFive, func() error {
return netLinker.LinkDel(link)
})
waitAndCleanup = func() error {
<-ctx.Done()
closers.cleanup(logger)
return ctx.Err()
}
return link, waitAndCleanup, nil
}
func setupUserSpace(ctx context.Context,
interfaceName string, netLinker NetLinker, mtu uint16,
closers *closers, logger Logger) (
link netlink.Link, waitAndCleanup waitAndCleanupFunc, err error) {
tun, err := tun.CreateTUN(interfaceName, int(mtu))
if err != nil {
return link, nil, fmt.Errorf("%w: %s", ErrCreateTun, err)
}
closers.add("closing TUN device", stepSeven, tun.Close)
tunName, err := tun.Name()
if err != nil {
return link, nil, fmt.Errorf("%w: cannot get TUN name: %s", ErrCreateTun, err)
} else if tunName != interfaceName {
return link, nil, fmt.Errorf("%w: names don't match: expected %q and got %q",
ErrCreateTun, interfaceName, tunName)
}
link, err = netLinker.LinkByName(interfaceName)
if err != nil {
return link, nil, fmt.Errorf("%w: %s: %s", ErrFindLink, interfaceName, err)
}
closers.add("deleting link", stepFive, func() error {
return netLinker.LinkDel(link)
})
bind := conn.NewDefaultBind()
closers.add("closing bind", stepSeven, bind.Close)
deviceLogger := makeDeviceLogger(logger)
device := device.NewDevice(tun, bind, deviceLogger)
closers.add("closing Wireguard device", stepSix, func() error {
device.Close()
return nil
})
uapiFile, err := ipc.UAPIOpen(interfaceName)
if err != nil {
return link, nil, fmt.Errorf("%w: %s", ErrUAPISocketOpening, err)
}
closers.add("closing UAPI file", stepThree, uapiFile.Close)
uapiListener, err := ipc.UAPIListen(interfaceName, uapiFile)
if err != nil {
return link, nil, fmt.Errorf("%w: %s", ErrUAPIListen, err)
}
closers.add("closing UAPI listener", stepTwo, uapiListener.Close)
// acceptAndHandle exits when uapiListener is closed
uapiAcceptErrorCh := make(chan error)
go acceptAndHandle(uapiListener, device, uapiAcceptErrorCh)
waitAndCleanup = func() error {
select {
case <-ctx.Done():
err = ctx.Err()
case err = <-uapiAcceptErrorCh:
close(uapiAcceptErrorCh)
case <-device.Wait():
err = ErrDeviceWaited
}
closers.cleanup(logger)
<-uapiAcceptErrorCh // wait for acceptAndHandle to exit
return err
}
return link, waitAndCleanup, nil
}
func acceptAndHandle(uapi net.Listener, device *device.Device,
uapiAcceptErrorCh chan<- error) {
for { // stopped by uapiFile.Close()
conn, err := uapi.Accept()
if err != nil {
uapiAcceptErrorCh <- err
return
}
go device.IpcHandle(conn)
}
}