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client.go
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client.go
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/*
* Copyright (C) 2018 The "MysteriumNetwork/node" Authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package userspace
import (
"bufio"
"fmt"
"strings"
"github.com/pkg/errors"
"golang.zx2c4.com/wireguard/conn"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/tun"
"github.com/mysteriumnetwork/node/services/wireguard/connection/dns"
"github.com/mysteriumnetwork/node/services/wireguard/wgcfg"
"github.com/mysteriumnetwork/node/utils/actionstack"
"github.com/mysteriumnetwork/node/utils/netutil"
)
type client struct {
tun tun.Device
devAPI *device.Device
dnsManager dns.Manager
}
// NewWireguardClient creates new wireguard user space client.
func NewWireguardClient() (*client, error) {
return &client{
dnsManager: dns.NewManager(),
}, nil
}
func (c *client) ConfigureDevice(config wgcfg.DeviceConfig) (err error) {
rollback := actionstack.NewActionStack()
if c.tun, err = CreateTUN(config.IfaceName, config.Subnet); err != nil {
return errors.Wrap(err, "failed to create TUN device")
}
devAPI := device.NewDevice(c.tun, conn.NewDefaultBind(), device.NewLogger(device.LogLevelVerbose, "[userspace-wg]"))
c.devAPI = devAPI
rollback.Push(func() {
devAPI.Close()
c.devAPI = nil
})
if err := c.configureDevice(config); err != nil {
rollback.Run()
return err
}
if config.Peer.Endpoint != nil {
if err := netutil.AddDefaultRoute(config.IfaceName); err != nil {
rollback.Run()
return fmt.Errorf("could not add default route for %s: %w", config.IfaceName, err)
}
}
return nil
}
func (c *client) ReConfigureDevice(config wgcfg.DeviceConfig) (err error) {
if err = netutil.AssignIP(config.IfaceName, config.Subnet); err != nil {
return fmt.Errorf("failed to assign IP address: %w", err)
}
return c.configureDevice(config)
}
func (c *client) configureDevice(config wgcfg.DeviceConfig) (err error) {
if err := c.setDeviceConfig(config.Encode()); err != nil {
return errors.Wrap(err, "failed to configure initial device")
}
c.devAPI.Up()
if err := c.dnsManager.Set(dns.Config{
ScriptDir: config.DNSScriptDir,
IfaceName: config.IfaceName,
DNS: config.DNS,
}); err != nil {
return fmt.Errorf("could not set DNS: %w", err)
}
return nil
}
func (c *client) Close() error {
c.devAPI.Close() // c.devAPI.Close() closes c.tun too
if err := c.dnsManager.Clean(); err != nil {
return fmt.Errorf("could not clean DNS: %w", err)
}
return nil
}
func (c *client) PeerStats(string) (wgcfg.Stats, error) {
deviceState, err := ParseUserspaceDevice(c.devAPI.IpcGetOperation)
if err != nil {
return wgcfg.Stats{}, err
}
stats, err := ParseDevicePeerStats(deviceState)
if err != nil {
return wgcfg.Stats{}, err
}
return stats, nil
}
func (c *client) DestroyDevice(name string) error {
return destroyDevice(name)
}
func (c *client) setDeviceConfig(config string) error {
if err := c.devAPI.IpcSetOperation(bufio.NewReader(strings.NewReader(config))); err != nil {
return errors.Wrap(err, "failed to set device config")
}
return nil
}