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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,207 @@ | ||
| package vpn | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "sync" | ||
|
|
||
| "github.com/labstack/echo/v4" | ||
| log "github.com/sirupsen/logrus" | ||
| "github.com/songgao/water" | ||
| "github.com/vishvananda/netlink" | ||
| ) | ||
|
|
||
| // InterfaceName defines the default name for the network interface created by ShellHub. | ||
| const InterfaceName string = "shb" | ||
|
|
||
| var ErrGenerateInterface = errors.New("failed to generate an interface") | ||
|
|
||
| func GenerateInterfaceName() (string, error) { | ||
| const Attempts = 10 | ||
|
|
||
| for i := 0; i < Attempts; i++ { | ||
| name := fmt.Sprintf("%s%d", InterfaceName, i) | ||
|
|
||
| if _, err := netlink.LinkByName(name); err == nil { | ||
| continue | ||
| } | ||
|
|
||
| return name, nil | ||
| } | ||
|
|
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| return "", ErrGenerateInterface | ||
| } | ||
|
|
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| type Settings struct { | ||
| Address [4]byte `json:"address"` | ||
| Mask byte `json:"mask"` | ||
| } | ||
|
|
||
| // ParseSettings read and parses the [Settings] structure from an [io.Reader]. | ||
| func ParseSettings(data io.Reader) (*Settings, error) { | ||
| body, err := io.ReadAll(data) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| settings := Settings{} | ||
| if err = json.Unmarshal(body, &settings); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &settings, nil | ||
| } | ||
|
|
||
| // String converts a [Settings] to a string representation on the format $IP/$Mask. | ||
| func (s *Settings) String() string { | ||
| ip := net.IPv4(s.Address[0], s.Address[1], s.Address[2], s.Address[3]) | ||
|
|
||
| return fmt.Sprintf("%s/%d", ip.String(), s.Mask) | ||
| } | ||
|
|
||
| func connHandler() func(c echo.Context) error { | ||
| return func(c echo.Context) error { | ||
| log.Info("new connection") | ||
|
|
||
| conn, _, err := c.Response().Hijack() | ||
| if err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| settings, err := ParseSettings(c.Request().Body) | ||
| if err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| log.WithFields(log.Fields{ | ||
| "addrss": settings.Address, | ||
| "mask": settings.Mask, | ||
| }).Info("handshake data") | ||
|
|
||
| name, err := GenerateInterfaceName() | ||
| if err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| ifce, err := water.New(water.Config{ | ||
| DeviceType: water.TUN, | ||
| PlatformSpecificParams: water.PlatformSpecificParams{ | ||
| Name: name, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| defer ifce.Close() | ||
|
|
||
| log.WithFields(log.Fields{ | ||
| "name": ifce.Name(), | ||
| }).Info("interface created") | ||
|
|
||
| addr, err := netlink.ParseAddr(settings.String()) // "10.0.0.1/24") | ||
| if err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| link, err := netlink.LinkByName(ifce.Name()) | ||
| if err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| if err := netlink.AddrAdd(link, addr); err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| log.Info("interface configured") | ||
|
|
||
| if err := netlink.LinkSetUp(link); err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| log.Info("interface up") | ||
|
|
||
| wg := new(sync.WaitGroup) | ||
|
|
||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
|
|
||
| buffer := make([]byte, 2048) | ||
|
|
||
| for { | ||
| log.Trace("reading from interface") | ||
|
|
||
| read, err := ifce.Read(buffer) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
|
|
||
| log.Trace("writing to connection") | ||
|
|
||
| if _, err = conn.Write(buffer[:read]); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
|
|
||
| buffer := make([]byte, 2048) | ||
|
|
||
| for { | ||
| log.Trace("reading from connetion") | ||
|
|
||
| read, err := conn.Read(buffer) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
|
|
||
| if read == 0 { | ||
| log.Debug("zero bytes was read from the connetion") | ||
|
|
||
| continue | ||
| } | ||
|
|
||
| log.Trace("writing to interface") | ||
|
|
||
| if _, err = ifce.Write(buffer[:read]); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| wg.Wait() | ||
|
|
||
| return nil | ||
| } | ||
| } | ||
|
|
||
| func closeHandler() func(c echo.Context) error { | ||
| return func(c echo.Context) error { | ||
| log.Trace("close handler called") | ||
|
|
||
| return nil | ||
| } | ||
| } |
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