131 lines
3.5 KiB
Go
131 lines
3.5 KiB
Go
// Copyright 2019 the Kilo authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package wireguard
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import (
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"bytes"
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"fmt"
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"os/exec"
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"regexp"
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"strconv"
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"github.com/vishvananda/netlink"
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)
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type wgLink struct {
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a netlink.LinkAttrs
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t string
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}
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func (w wgLink) Attrs() *netlink.LinkAttrs {
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return &w.a
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}
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func (w wgLink) Type() string {
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return w.t
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}
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// New creates a new WireGuard interface.
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func New(prefix string) (int, error) {
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links, err := netlink.LinkList()
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if err != nil {
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return 0, fmt.Errorf("failed to list links: %v", err)
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}
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max := 0
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re := regexp.MustCompile(fmt.Sprintf("^%s([0-9]+)$", prefix))
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for _, link := range links {
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if matches := re.FindStringSubmatch(link.Attrs().Name); len(matches) == 2 {
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i, err := strconv.Atoi(matches[1])
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if err != nil {
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// This should never happen.
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return 0, fmt.Errorf("failed to parse digits as an integer: %v", err)
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}
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if i >= max {
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max = i + 1
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}
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}
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}
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name := fmt.Sprintf("%s%d", prefix, max)
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wl := wgLink{a: netlink.NewLinkAttrs(), t: "wireguard"}
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wl.a.Name = name
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if err := netlink.LinkAdd(wl); err != nil {
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return 0, fmt.Errorf("failed to create interface %s: %v", name, err)
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}
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link, err := netlink.LinkByName(name)
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if err != nil {
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return 0, fmt.Errorf("failed to get interface index: %v", err)
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}
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return link.Attrs().Index, nil
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}
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// Keys generates a WireGuard private and public key-pair.
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func Keys() ([]byte, []byte, error) {
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private, err := GenKey()
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if err != nil {
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return nil, nil, fmt.Errorf("failed to generate private key: %v", err)
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}
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public, err := PubKey(private)
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return private, public, err
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}
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// GenKey generates a WireGuard private key.
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func GenKey() ([]byte, error) {
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key, err := exec.Command("wg", "genkey").Output()
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return bytes.Trim(key, "\n"), err
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}
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// PubKey generates a WireGuard public key for a given private key.
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func PubKey(key []byte) ([]byte, error) {
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cmd := exec.Command("wg", "pubkey")
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stdin, err := cmd.StdinPipe()
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if err != nil {
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return nil, fmt.Errorf("failed to open pipe to stdin: %v", err)
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}
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go func() {
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defer stdin.Close()
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stdin.Write(key)
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}()
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public, err := cmd.Output()
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if err != nil {
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return nil, fmt.Errorf("failed to generate public key: %v", err)
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}
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return bytes.Trim(public, "\n"), nil
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}
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// SetConf applies a WireGuard configuration file to the given interface.
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func SetConf(iface string, path string) error {
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cmd := exec.Command("wg", "setconf", iface, path)
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var stderr bytes.Buffer
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cmd.Stderr = &stderr
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if err := cmd.Run(); err != nil {
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return fmt.Errorf("failed to apply the WireGuard configuration: %s", stderr.String())
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}
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return nil
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}
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// ShowConf gets the WireGuard configuration for the given interface.
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func ShowConf(iface string) ([]byte, error) {
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cmd := exec.Command("wg", "showconf", iface)
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var stderr, stdout bytes.Buffer
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cmd.Stderr = &stderr
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cmd.Stdout = &stdout
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if err := cmd.Run(); err != nil {
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return nil, fmt.Errorf("failed to read the WireGuard configuration: %s", stderr.String())
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}
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return stdout.Bytes(), nil
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}
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