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tailscale/wgengine/wgcfg/device.go

70 lines
1.6 KiB
Go

// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wgcfg
import (
"io"
"sort"
"golang.zx2c4.com/wireguard/conn"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/tun"
"tailscale.com/types/logger"
"tailscale.com/util/multierr"
)
// NewDevice returns a wireguard-go Device configured for Tailscale use.
func NewDevice(tunDev tun.Device, bind conn.Bind, logger *device.Logger) *device.Device {
ret := device.NewDevice(tunDev, bind, logger)
ret.DisableSomeRoamingForBrokenMobileSemantics()
return ret
}
func DeviceConfig(d *device.Device) (*Config, error) {
r, w := io.Pipe()
errc := make(chan error, 1)
go func() {
errc <- d.IpcGetOperation(w)
w.Close()
}()
cfg, fromErr := FromUAPI(r)
r.Close()
getErr := <-errc
err := multierr.New(getErr, fromErr)
if err != nil {
return nil, err
}
sort.Slice(cfg.Peers, func(i, j int) bool {
return cfg.Peers[i].PublicKey.Less(cfg.Peers[j].PublicKey)
})
return cfg, nil
}
// ReconfigDevice replaces the existing device configuration with cfg.
func ReconfigDevice(d *device.Device, cfg *Config, logf logger.Logf) (err error) {
defer func() {
if err != nil {
logf("wgcfg.Reconfig failed: %v", err)
}
}()
prev, err := DeviceConfig(d)
if err != nil {
return err
}
r, w := io.Pipe()
errc := make(chan error, 1)
go func() {
errc <- d.IpcSetOperation(r)
r.Close()
}()
toErr := cfg.ToUAPI(w, prev)
w.Close()
setErr := <-errc
return multierr.New(setErr, toErr)
}