Propagate client addr with connection options

client/direct.go

 		return nil, nil, errors.Annotate(err, "Cannot parse obfuscated frame")
 	}
 	connOpts.ConnectionProto = mtproto.ConnectionProtocolAny
+	connOpts.ClientAddr = conn.RemoteAddr().(*net.TCPAddr)
 
 	socket := wrappers.NewTimeoutRWC(conn)
 	socket = wrappers.NewStreamCipherRWC(socket, obfs2.Encryptor, obfs2.Decryptor)

mtproto/connection_options.go

 
 import (
 	"bytes"
+	"net"
 
 	"github.com/juju/errors"
 )
 	DC              int16
 	ConnectionType  ConnectionType
 	ConnectionProto ConnectionProtocol
+	ClientAddr      *net.TCPAddr
 }
 
 // Different connection types which user requests from Telegram.