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tailscale/wgengine/wgcfg/device.go

65 lines
1.3 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/device"
"tailscale.com/types/logger"
)
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, err := FromUAPI(r)
// Prefer errors from IpcGetOperation.
if setErr := <-errc; setErr != nil {
return nil, setErr
}
// Check FromUAPI error.
if err != nil {
return nil, err
}
sort.Slice(cfg.Peers, func(i, j int) bool {
return cfg.Peers[i].PublicKey.LessThan(&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)
w.Close()
}()
err = cfg.ToUAPI(w, prev)
w.Close()
// Prefer errors from IpcSetOperation.
if setErr := <-errc; setErr != nil {
return setErr
}
return err // err (if any) from cfg.ToUAPI
}