/
client.go
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/
client.go
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/*
* Copyright (C) 2022 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 proxyclient
import (
"bufio"
"context"
"fmt"
"net/http"
"net/netip"
"strings"
"sync"
"time"
"github.com/rs/zerolog/log"
"golang.zx2c4.com/wireguard/conn"
"golang.zx2c4.com/wireguard/device"
"github.com/mysteriumnetwork/node/services/wireguard/endpoint/netstack"
"github.com/mysteriumnetwork/node/services/wireguard/endpoint/userspace"
"github.com/mysteriumnetwork/node/services/wireguard/wgcfg"
)
type client struct {
mu sync.Mutex
Device *device.Device
proxyClose func() error
}
// New create new WireGuard client which serves requests via proxy.
func New() (*client, error) {
log.Debug().Msg("Creating proxy wg client")
return &client{}, nil
}
func (c *client) ReConfigureDevice(config wgcfg.DeviceConfig) error {
return c.ConfigureDevice(config)
}
func (c *client) ConfigureDevice(cfg wgcfg.DeviceConfig) error {
localAddr, err := netip.ParseAddr(cfg.Subnet.IP.String())
if err != nil {
return fmt.Errorf("could not parse local addr: %w", err)
}
if len(cfg.DNS) == 0 {
return fmt.Errorf("DNS addr list is empty")
}
dnsAddr, err := netip.ParseAddr(cfg.DNS[0])
if err != nil {
return fmt.Errorf("could not parse DNS addr: %w", err)
}
tunnel, tnet, err := netstack.CreateNetTUN([]netip.Addr{localAddr}, []netip.Addr{dnsAddr}, device.DefaultMTU)
if err != nil {
return fmt.Errorf("failed to create netstack device %s: %w", cfg.IfaceName, err)
}
logger := device.NewLogger(device.LogLevelVerbose, fmt.Sprintf("(%s) ", cfg.IfaceName))
wgDevice := device.NewDevice(tunnel, conn.NewDefaultBind(), logger)
log.Info().Msg("Applying interface configuration")
if err := wgDevice.IpcSetOperation(bufio.NewReader(strings.NewReader(cfg.Encode()))); err != nil {
wgDevice.Close()
return fmt.Errorf("could not set device uapi config: %w", err)
}
log.Info().Msg("Bringing device up")
wgDevice.Up()
c.mu.Lock()
c.Device = wgDevice
c.mu.Unlock()
if err := c.Proxy(tnet, cfg.ProxyPort); err != nil {
wgDevice.Close()
return err
}
return nil
}
func (c *client) DestroyDevice(iface string) error {
return c.Close()
}
func (c *client) PeerStats(iface string) (wgcfg.Stats, error) {
deviceState, err := userspace.ParseUserspaceDevice(c.Device.IpcGetOperation)
if err != nil {
return wgcfg.Stats{}, fmt.Errorf("could not parse device state: %w", err)
}
stats, statErr := userspace.ParseDevicePeerStats(deviceState)
if err != nil {
err = statErr
log.Warn().Err(err).Msg("Failed to parse device stats, will try again")
} else {
return stats, nil
}
return wgcfg.Stats{}, fmt.Errorf("could not parse device state: %w", err)
}
func (c *client) Close() (err error) {
c.mu.Lock()
defer c.mu.Unlock()
if c.proxyClose != nil {
c.proxyClose()
}
if c.Device != nil {
go func() {
time.Sleep(2 * time.Minute)
c.Device.Close()
}()
}
return nil
}
func (c *client) Proxy(tnet *netstack.Net, proxyPort int) error {
c.mu.Lock()
defer c.mu.Unlock()
server := http.Server{
Addr: fmt.Sprintf(":%d", proxyPort),
Handler: newProxyHandler(60*time.Second, tnet),
ReadTimeout: 0,
ReadHeaderTimeout: 0,
WriteTimeout: 0,
IdleTimeout: 0,
}
log.Info().Msgf("Starting proxy server at :%d ...", proxyPort)
c.proxyClose = func() error {
ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
defer cancel()
server.Shutdown(ctx)
return server.Close()
}
go func() {
err := server.ListenAndServe()
log.Error().Err(err).Msg("Shutting down proxy server...")
}()
return nil
}