forked from extern/smegmesh
dbc18bddc6
- Performing DAD to check if IPv6 address present before adding outselves to mesh - Changing name from wgmesh to smegmesh
94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
package wg
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import (
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"crypto"
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"crypto/rand"
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"fmt"
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"github.com/tim-beatham/smegmesh/pkg/lib"
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logging "github.com/tim-beatham/smegmesh/pkg/log"
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"golang.zx2c4.com/wireguard/wgctrl"
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"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
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)
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type WgInterfaceManipulatorImpl struct {
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client *wgctrl.Client
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}
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const hashLength = 6
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// CreateInterface creates a WireGuard interface
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func (m *WgInterfaceManipulatorImpl) CreateInterface(port int, privKey *wgtypes.Key) (string, error) {
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rtnl, err := lib.NewRtNetlinkConfig()
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if err != nil {
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return "", fmt.Errorf("failed to access link: %w", err)
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}
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defer rtnl.Close()
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randomBuf := make([]byte, 32)
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_, err = rand.Read(randomBuf)
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if err != nil {
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return "", err
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}
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md5 := crypto.MD5.New().Sum(randomBuf)
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md5Str := fmt.Sprintf("wg%x", md5)[:hashLength]
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err = rtnl.CreateLink(md5Str)
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if err != nil {
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return "", fmt.Errorf("failed to create link: %w", err)
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}
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var cfg wgtypes.Config = wgtypes.Config{
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PrivateKey: privKey,
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ListenPort: &port,
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}
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err = m.client.ConfigureDevice(md5Str, cfg)
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if err != nil {
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m.RemoveInterface(md5Str)
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return "", fmt.Errorf("failed to configure dev: %w", err)
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}
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logging.Log.WriteInfof("ip link set up dev %s type wireguard", md5Str)
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return md5Str, nil
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}
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// Add an address to the given interface
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func (m *WgInterfaceManipulatorImpl) AddAddress(ifName string, addr string) error {
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rtnl, err := lib.NewRtNetlinkConfig()
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if err != nil {
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return fmt.Errorf("failed to create config: %w", err)
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}
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defer rtnl.Close()
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err = rtnl.AddAddress(ifName, addr)
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if err != nil {
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err = fmt.Errorf("failed to add address: %w", err)
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}
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return err
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}
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// RemoveInterface implements WgInterfaceManipulator.
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func (*WgInterfaceManipulatorImpl) RemoveInterface(ifName string) error {
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rtnl, err := lib.NewRtNetlinkConfig()
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if err != nil {
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return fmt.Errorf("failed to create config: %w", err)
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}
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defer rtnl.Close()
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return rtnl.DeleteLink(ifName)
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}
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func NewWgInterfaceManipulator(client *wgctrl.Client) WgInterfaceManipulator {
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return &WgInterfaceManipulatorImpl{client: client}
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}
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