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obfuscated.go
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obfuscated.go
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package transport
import (
"bytes"
"io"
"net"
"github.com/go-faster/errors"
"go.uber.org/multierr"
"github.com/gotd/td/mtproxy/obfuscated2"
"github.com/gotd/td/proto/codec"
)
type obfListener struct {
listener net.Listener
}
type obfConn struct {
reader io.Reader
writer io.Writer
net.Conn
}
func (c *obfConn) Read(p []byte) (int, error) {
return c.reader.Read(p)
}
func (c *obfConn) Write(p []byte) (int, error) {
return c.writer.Write(p)
}
// ObfuscatedListener creates new obfuscated2 listener using given net.Listener.
//
// Useful for creating Telegram servers:
//
// transport.Listen(transport.ObfuscatedListener(ln))
func ObfuscatedListener(listener net.Listener) net.Listener {
return obfListener{listener: listener}
}
// Accept waits for and returns the next connection to the listener.
func (l obfListener) Accept() (_ net.Conn, err error) {
conn, err := l.listener.Accept()
if err != nil {
return nil, err
}
defer func() {
if err != nil {
multierr.AppendInto(&err, conn.Close())
}
}()
rw, md, err := obfuscated2.Accept(conn, nil)
if err != nil {
return nil, errors.Wrap(err, "accept")
}
var tag *bytes.Reader
if md.Protocol[0] == codec.AbridgedClientStart[0] {
// Abridged sends only byte for tag.
tag = bytes.NewReader(md.Protocol[:1])
} else {
tag = bytes.NewReader(md.Protocol[:])
}
accepted := &obfConn{
reader: io.MultiReader(tag, rw),
writer: rw,
Conn: conn,
}
return accepted, nil
}
// Close closes the listener.
// Any blocked Accept operations will be unblocked and return errors.
func (l obfListener) Close() error {
return l.listener.Close()
}
// Addr returns the listener's network address.
func (l obfListener) Addr() net.Addr {
return l.listener.Addr()
}