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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| package vpn | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "net" | ||
|
|
||
| "github.com/labstack/echo/v4" | ||
| log "github.com/sirupsen/logrus" | ||
| "github.com/vishvananda/netlink" | ||
| ) | ||
|
|
||
| // PacketMaxSize defines the max size of each IP packet received. | ||
| // TODO: This isn't the real max size; set the right one. | ||
| const PacketMaxSize = 2048 | ||
|
|
||
| // 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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||
| func handler(handler func(net.Conn, *Settings) error) func(c echo.Context) error { | ||
| return func(c echo.Context) error { | ||
| conn, _, err := c.Response().Hijack() | ||
| if err != nil { | ||
| log.Error(err) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| defer conn.Close() | ||
|
|
||
| settings, err := ParseSettings(c.Request().Body) | ||
| if err != nil { | ||
| log.WithError(err).Error("faild to parse the settings") | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| // NOTE: the [handler] is called to handler the core logic of the VPN client, while this handler is used to extract | ||
| // the connection and the settings data. | ||
| if err := handler(conn, settings); err != nil { | ||
| log.WithError(err).Error("failed to handler the vpn connection between server and agent") | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
| } | ||
|
|
||
| func closeHandler(callback func() error) func(c echo.Context) error { | ||
| return func(c echo.Context) error { | ||
| log.Trace("close handler called") | ||
|
|
||
| return callback() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| package vpn | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| ) | ||
|
|
||
| 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) | ||
| } |
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