Xray-core/proxy/mtproto/client.go

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2020-11-25 13:01:53 +02:00
package mtproto
import (
"context"
"github.com/xtls/xray-core/v1/common"
"github.com/xtls/xray-core/v1/common/buf"
"github.com/xtls/xray-core/v1/common/crypto"
"github.com/xtls/xray-core/v1/common/net"
"github.com/xtls/xray-core/v1/common/session"
"github.com/xtls/xray-core/v1/common/task"
"github.com/xtls/xray-core/v1/transport"
"github.com/xtls/xray-core/v1/transport/internet"
)
type Client struct {
}
func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
return &Client{}, nil
}
func (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
outbound := session.OutboundFromContext(ctx)
if outbound == nil || !outbound.Target.IsValid() {
return newError("unknown destination.")
}
dest := outbound.Target
if dest.Network != net.Network_TCP {
return newError("not TCP traffic", dest)
}
conn, err := dialer.Dial(ctx, dest)
if err != nil {
return newError("failed to dial to ", dest).Base(err).AtWarning()
}
defer conn.Close()
sc := SessionContextFromContext(ctx)
auth := NewAuthentication(sc)
defer putAuthenticationObject(auth)
request := func() error {
encryptor := crypto.NewAesCTRStream(auth.EncodingKey[:], auth.EncodingNonce[:])
var header [HeaderSize]byte
encryptor.XORKeyStream(header[:], auth.Header[:])
copy(header[:56], auth.Header[:])
if _, err := conn.Write(header[:]); err != nil {
return newError("failed to write auth header").Base(err)
}
connWriter := buf.NewWriter(crypto.NewCryptionWriter(encryptor, conn))
return buf.Copy(link.Reader, connWriter)
}
response := func() error {
decryptor := crypto.NewAesCTRStream(auth.DecodingKey[:], auth.DecodingNonce[:])
connReader := buf.NewReader(crypto.NewCryptionReader(decryptor, conn))
return buf.Copy(connReader, link.Writer)
}
var responseDoneAndCloseWriter = task.OnSuccess(response, task.Close(link.Writer))
if err := task.Run(ctx, request, responseDoneAndCloseWriter); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewClient(ctx, config.(*ClientConfig))
}))
}