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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| package chained | ||
|
|
||
| import ( | ||
| "context" | ||
| crand "crypto/rand" | ||
| "encoding/binary" | ||
| mrand "math/rand" | ||
| "net" | ||
| "sync" | ||
|
|
||
| "github.com/getlantern/common/config" | ||
| "github.com/getlantern/errors" | ||
| "github.com/getlantern/flashlight/v7/ops" | ||
|
|
||
| vmess "github.com/sagernet/sing-vmess" | ||
| "github.com/sagernet/sing/common" | ||
| "github.com/sagernet/sing/common/metadata" | ||
| N "github.com/sagernet/sing/common/network" | ||
| ) | ||
|
|
||
| type vmessImpl struct { | ||
| reportDialCore reportDialCoreFn | ||
| client *vmess.Client | ||
| uuid string | ||
| rng *mrand.Rand | ||
| rngmx sync.Mutex | ||
| addr string | ||
| } | ||
|
|
||
| // newVmessImpl creates a new VMess proxy implementation. | ||
| // supports the following options: | ||
| // - uuid: the UUID of the user on the VMess server | ||
| // - security: the security level to use, defaults to "auto". Options are: | ||
| // "auto": automatically determine the security level | ||
| // "none" or "zero": no security | ||
| // "aes-128-cfb": legacy security | ||
| // "aes-128-gcm": AES-128-GCM security | ||
| // "chacha20-poly1305": ChaCha20-Poly1305 security | ||
|
|
||
| func newVmessImpl(name, addr string, pc *config.ProxyConfig, reportDialCore reportDialCoreFn) (proxyImpl, error) { | ||
| uuid := ptSetting(pc, "uuid") | ||
| security := ptSetting(pc, "security") | ||
| if security == "" { | ||
| security = "auto" | ||
| } | ||
|
|
||
| client, err := vmess.NewClient(uuid, security, 0) | ||
|
|
||
| if err != nil { | ||
| return nil, errors.New("failed to create vmess client: %v", err) | ||
| } | ||
|
|
||
| var seed int64 | ||
| err = binary.Read(crand.Reader, binary.BigEndian, &seed) | ||
| if err != nil { | ||
| return nil, errors.New("unable to initialize rng: %v", err) | ||
| } | ||
|
|
||
| source := mrand.NewSource(seed) | ||
|
|
||
| return &vmessImpl{ | ||
| reportDialCore: reportDialCore, | ||
| client: client, | ||
| uuid: uuid, | ||
| addr: addr, | ||
| rng: mrand.New(source), | ||
| }, nil | ||
| } | ||
|
|
||
| func (impl *vmessImpl) close() { | ||
| } | ||
|
|
||
| func (impl *vmessImpl) dialServer(op *ops.Op, ctx context.Context) (net.Conn, error) { | ||
| return impl.reportDialCore(op, func() (net.Conn, error) { | ||
| target := metadata.ParseSocksaddrHostPort(impl.generateUpstream(), 443) | ||
| conn, err := (&net.Dialer{}).DialContext(ctx, N.NetworkTCP, impl.addr) | ||
| if err != nil { | ||
| common.Close(conn) | ||
| return nil, err | ||
| } | ||
| return impl.client.DialEarlyConn(conn, target), nil | ||
| }) | ||
| } | ||
|
|
||
| // generateUpstream() creates a marker upstream address. This isn't an | ||
| // acutal upstream that will be dialed, it signals that the upstream | ||
| // should be determined by other methods. It's just a bit random just to | ||
| // mix it up and not do anything especially consistent on every dial. | ||
| func (impl *vmessImpl) generateUpstream() string { | ||
| const letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" | ||
| impl.rngmx.Lock() | ||
| defer impl.rngmx.Unlock() | ||
| // [2 - 22] | ||
| sz := 2 + impl.rng.Intn(21) | ||
| b := make([]byte, sz) | ||
| for i := range b { | ||
| b[i] = letters[impl.rng.Intn(len(letters))] | ||
| } | ||
| return string(b) + ".com" | ||
| } |
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