commit a11428262d283dcfb02d70fd2e99080cdc1033fc Author: Damian Johnson atagar@torproject.org Date: Sun Dec 31 14:34:05 2017 -0800

Stub initial RelaySocket

Ok, time to start adding ORPort support. Adding a socket class similar to our ControlSocket. Unfotunately we need to fill this out a bit more before it'll be testable. --- stem/socket.py | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 96 insertions(+), 9 deletions(-)

diff --git a/stem/socket.py b/stem/socket.py index 6bf13a39..1b9cea5f 100644 --- a/stem/socket.py +++ b/stem/socket.py @@ -47,6 +47,10 @@ Tor... ::

BaseSocket - Thread safe socket. + |- RelaySocket - Socket for a relay's ORPort. + | |- send - sends a message to the socket + | +- recv - receives a response from the socket + | |- ControlSocket - Socket wrapper that speaks the tor control protocol. | |- ControlPort - Control connection via a port. | |- ControlSocketFile - Control connection via a local file socket. @@ -86,6 +90,10 @@ ERROR_MSG = 'Error while receiving a control message (%s): %s'

TRUNCATE_LOGS = 10

+# maximum number of bytes to read at a time from a relay socket + +MAX_READ_BUFFER_LEN = 10 * 1024 * 1024 +

class BaseSocket(object): """ @@ -336,6 +344,81 @@ class BaseSocket(object): raise NotImplementedError('Unsupported Operation: this should be implemented by the BaseSocket subclass')

+class RelaySocket(BaseSocket): + """ + `Link-level connection + https://gitweb.torproject.org/torspec.git/tree/tor-spec.txt`_ to a Tor + relay. + + :var str address: address our socket connects to + :var int port: ORPort our socket connects to + """ + + def __init__(self, address = '127.0.0.1', port = 9050, connect = True): + """ + RelaySocket constructor. + + :param str address: ip address of the relay + :param int port: orport of the relay + :param bool connect: connects to the socket if True, leaves it unconnected otherwise + + :raises: :class:`stem.SocketError` if connect is **True** and we're + unable to establish a connection + """ + + super(RelaySocket, self).__init__() + self.address = address + self.port = port + + if connect: + self.connect() + + def send(self, message): + """ + Sends a message to the relay's ORPort. + + :param str message: message to be formatted and sent to the socket + + :raises: + * :class:`stem.SocketError` if a problem arises in using the socket + * :class:`stem.SocketClosed` if the socket is known to be shut down + """ + + self._send(message, _write_to_socket) + + def recv(self, max_response_size = MAX_READ_BUFFER_LEN): + """ + Receives a message from the relay. + + :param int max_response_size: maximum bytes to return + + :returns: bytes for the message received + + :raises: + * :class:`stem.ProtocolError` the content from the socket is malformed + * :class:`stem.SocketClosed` if the socket closes before we receive a complete message + """ + + # TODO: Not really sure what we'll want here. To start with just copying + # endosome's behavior. + + def _read(control_file): + return control_file.read(max_response_size) + + return self._recv(_read) + + def is_localhost(self): + return self.address == '127.0.0.1' + + def _make_socket(self): + try: + relay_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) + relay_socket.connect((self.address, self.port)) + return relay_socket + except socket.error as exc: + raise stem.SocketError(exc) + + class ControlSocket(BaseSocket): """ Wrapper for a socket connection that speaks the Tor control protocol. To the @@ -531,16 +614,20 @@ def send_message(control_file, message, raw = False): if not raw: message = send_formatting(message)

- try: - control_file.write(stem.util.str_tools._to_bytes(message)) - control_file.flush() + _write_to_socket(control_file, message)

- if log.is_tracing(): - log_message = message.replace('\r\n', '\n').rstrip() - msg_div = '\n' if '\n' in log_message else ' ' - log.trace('Sent to tor:%s%s' % (msg_div, log_message)) + if log.is_tracing(): + log_message = message.replace('\r\n', '\n').rstrip() + msg_div = '\n' if '\n' in log_message else ' ' + log.trace('Sent to tor:%s%s' % (msg_div, log_message)) + + +def _write_to_socket(socket_file, message): + try: + socket_file.write(stem.util.str_tools._to_bytes(message)) + socket_file.flush() except socket.error as exc: - log.info('Failed to send message: %s' % exc) + log.info('Failed to send: %s' % exc)

# When sending there doesn't seem to be a reliable method for # distinguishing between failures from a disconnect verses other things. @@ -554,7 +641,7 @@ def send_message(control_file, message, raw = False): # if the control_file has been closed then flush will receive: # AttributeError: 'NoneType' object has no attribute 'sendall'

- log.info('Failed to send message: file has been closed') + log.info('Failed to send: file has been closed') raise stem.SocketClosed('file has been closed')