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619ab6db0f
onionshare/lib/stem/__init__.py
Micah Lee 619ab6db0f added stem python library
2014-05-21 14:09:41 -04:00

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# Copyright 2011-2013, Damian Johnson and The Tor Project
# See LICENSE for licensing information
"""
Library for working with the tor process.
**Module Overview:**
::
ControllerError - Base exception raised when using the controller.
|- ProtocolError - Malformed socket data.
|- OperationFailed - Tor was unable to successfully complete the operation.
| |- UnsatisfiableRequest - Tor was unable to satisfy a valid request.
| | +- CircuitExtensionFailed - Attempt to make or extend a circuit failed.
| +- InvalidRequest - Invalid request.
| +- InvalidArguments - Invalid request parameters.
+- SocketError - Communication with the socket failed.
+- SocketClosed - Socket has been shut down.
.. data:: Runlevel (enum)
Rating of importance used for event logging.
=========== ===========
Runlevel Description
=========== ===========
**ERR** critical issues that impair tor's ability to function
**WARN** non-critical issues the user should be aware of
**NOTICE** information that may be helpful to the user
**INFO** high level runtime information
**DEBUG** low level runtime information
=========== ===========
.. data:: Signal (enum)
Signals that the tor process will accept.
========================= ===========
Signal Description
========================= ===========
**RELOAD** or **HUP** reloads our torrc
**SHUTDOWN** or **INT** shut down, waiting ShutdownWaitLength first if we're a relay
**DUMP** or **USR1** dumps information about open connections and circuits to our log
**DEBUG** or **USR2** switch our logging to the DEBUG runlevel
**HALT** or **TERM** exit tor immediately
**NEWNYM** switch to new circuits, so new application requests don't share any circuits with old ones (this also clears our DNS cache)
**CLEARDNSCACHE** clears cached DNS results
========================= ===========
.. data:: Flag (enum)
Flag assigned to tor relays by the authorities to indicate various
characteristics.
================= ===========
Flag Description
================= ===========
**AUTHORITY** relay is a directory authority
**BADEXIT** relay shouldn't be used as an exit due to being either problematic or malicious (`wiki <https://trac.torproject.org/projects/tor/wiki/doc/badRelays>`_)
**BADDIRECTORY** relay shouldn't be used for directory information
**EXIT** relay's exit policy makes it more useful as an exit rather than middle hop
**FAST** relay's suitable for high-bandwidth circuits
**GUARD** relay's suitable for being an entry guard (first hop)
**HSDIR** relay is being used as a v2 hidden service directory
**NAMED** relay can be referred to by its nickname
**RUNNING** relay is currently usable
**STABLE** relay's suitable for long-lived circuits
**UNNAMED** relay isn't presently bound to a nickname
**V2DIR** relay supports the v2 directory protocol
**VALID** relay has been validated
================= ===========
.. data:: CircStatus (enum)
Statuses that a circuit can be in. Tor may provide statuses not in this enum.
============ ===========
CircStatus Description
============ ===========
**LAUNCHED** new circuit was created
**BUILT** circuit finished being created and can accept traffic
**EXTENDED** circuit has been extended by a hop
**FAILED** circuit construction failed
**CLOSED** circuit has been closed
============ ===========
.. data:: CircBuildFlag (enum)
Attributes about how a circuit is built. These were introduced in tor version
0.2.3.11. Tor may provide flags not in this enum.
================= ===========
CircBuildFlag Description
================= ===========
**ONEHOP_TUNNEL** single hop circuit to fetch directory information
**IS_INTERNAL** circuit that won't be used for client traffic
**NEED_CAPACITY** circuit only includes high capacity relays
**NEED_UPTIME** circuit only includes relays with a high uptime
================= ===========
.. data:: CircPurpose (enum)
Description of what a circuit is intended for. These were introduced in tor
version 0.2.1.6. Tor may provide purposes not in this enum.
==================== ===========
CircPurpose Description
==================== ===========
**GENERAL** client traffic or fetching directory information
**HS_CLIENT_INTRO** client side introduction point for a hidden service circuit
**HS_CLIENT_REND** client side hidden service rendezvous circuit
**HS_SERVICE_INTRO** server side introduction point for a hidden service circuit
**HS_SERVICE_REND** server side hidden service rendezvous circuit
**TESTING** testing to see if we're reachable, so we can be used as a relay
**CONTROLLER** circuit that was built by a controller
**MEASURE_TIMEOUT** circuit being kept around to see how long it takes
==================== ===========
.. data:: CircClosureReason (enum)
Reason that a circuit is being closed or failed to be established. Tor may
provide reasons not in this enum.
========================= ===========
CircClosureReason Description
========================= ===========
**NONE** no reason given
**TORPROTOCOL** violation in the tor protocol
**INTERNAL** internal error
**REQUESTED** requested by the client via a TRUNCATE command
**HIBERNATING** relay is presently hibernating
**RESOURCELIMIT** relay is out of memory, sockets, or circuit IDs
**CONNECTFAILED** unable to contact the relay
**OR_IDENTITY** relay had the wrong OR identification
**OR_CONN_CLOSED** connection failed after being established
**FINISHED** circuit has expired (see tor's MaxCircuitDirtiness config option)
**TIMEOUT** circuit construction timed out
**DESTROYED** circuit unexpectedly closed
**NOPATH** not enough relays to make a circuit
**NOSUCHSERVICE** requested hidden service does not exist
**MEASUREMENT_EXPIRED** same as **TIMEOUT** except that it was left open for measurement purposes
========================= ===========
.. data:: CircEvent (enum)
Type of change reflected in a circuit by a CIRC_MINOR event. Tor may provide
event types not in this enum.
===================== ===========
CircEvent Description
===================== ===========
**PURPOSE_CHANGED** circuit purpose or hidden service state has changed
**CANNIBALIZED** circuit connections are being reused for a different circuit
===================== ===========
.. data:: HiddenServiceState (enum)
State that a hidden service circuit can have. These were introduced in tor
version 0.2.3.11. Tor may provide states not in this enum.
Enumerations fall into four groups based on their prefix...
======= ===========
Prefix Description
======= ===========
HSCI_* client-side introduction-point
HSCR_* client-side rendezvous-point
HSSI_* service-side introduction-point
HSSR_* service-side rendezvous-point
======= ===========
============================= ===========
HiddenServiceState Description
============================= ===========
**HSCI_CONNECTING** connecting to the introductory point
**HSCI_INTRO_SENT** sent INTRODUCE1 and awaiting a reply
**HSCI_DONE** received a reply, circuit is closing
**HSCR_CONNECTING** connecting to the introductory point
**HSCR_ESTABLISHED_IDLE** rendezvous-point established, awaiting an introduction
**HSCR_ESTABLISHED_WAITING** introduction received, awaiting a rend
**HSCR_JOINED** connected to the hidden service
**HSSI_CONNECTING** connecting to the introductory point
**HSSI_ESTABLISHED** established introductory point
**HSSR_CONNECTING** connecting to the introductory point
**HSSR_JOINED** connected to the rendezvous-point
============================= ===========
.. data:: RelayEndReason (enum)
Reasons why the stream is to be closed.
=================== ===========
RelayEndReason Description
=================== ===========
**MISC** none of the following reasons
**RESOLVEFAILED** unable to resolve the hostname
**CONNECTREFUSED** remote host refused the connection
**EXITPOLICY** OR refuses to connect to the destination
**DESTROY** circuit is being shut down
**DONE** connection has been closed
**TIMEOUT** connection timed out
**NOROUTE** routing error while contacting the destination
**HIBERNATING** relay is temporarily hibernating
**INTERNAL** internal error at the relay
**RESOURCELIMIT** relay has insufficient resources to service the request
**CONNRESET** connection was unexpectedly reset
**TORPROTOCOL** violation in the tor protocol
**NOTDIRECTORY** directory information requested from a relay that isn't mirroring it
=================== ===========
.. data:: StreamStatus (enum)
State that a stream going through tor can have. Tor may provide states not in
this enum.
================= ===========
StreamStatus Description
================= ===========
**NEW** request for a new connection
**NEWRESOLVE** request to resolve an address
**REMAP** address is being re-mapped to another
**SENTCONNECT** sent a connect cell along a circuit
**SENTRESOLVE** sent a resolve cell along a circuit
**SUCCEEDED** stream has been established
**FAILED** stream is detached, and won't be re-established
**DETACHED** stream is detached, but might be re-established
**CLOSED** stream has closed
================= ===========
.. data:: StreamClosureReason (enum)
Reason that a stream is being closed or failed to be established. This
includes all values in the :data:`~stem.RelayEndReason` enumeration as
well as the following. Tor may provide reasons not in this enum.
===================== ===========
StreamClosureReason Description
===================== ===========
**END** endpoint has sent a RELAY_END cell
**PRIVATE_ADDR** endpoint was a private address (127.0.0.1, 10.0.0.1, etc)
===================== ===========
.. data:: StreamSource (enum)
Cause of a stream being remapped to another address. Tor may provide sources
not in this enum.
============= ===========
StreamSource Description
============= ===========
**CACHE** tor is remapping because of a cached answer
**EXIT** exit relay requested the remap
============= ===========
.. data:: StreamPurpose (enum)
Purpsoe of the stream. This is only provided with new streams and tor may
provide purposes not in this enum.
================= ===========
StreamPurpose Description
================= ===========
**DIR_FETCH** fetching directory information (descriptors, consensus, etc)
**DIR_UPLOAD** uploading our descriptor to an authority
**DNS_REQUEST** user initiated DNS request
**DIRPORT_TEST** checking that our directory port is reachable externally
**USER** either relaying user traffic or not one of the above categories
================= ===========
.. data:: ORStatus (enum)
State that an OR connection can have. Tor may provide states not in this
enum.
=============== ===========
ORStatus Description
=============== ===========
**NEW** received OR connection, starting server-side handshake
**LAUNCHED** launched outbound OR connection, starting client-side handshake
**CONNECTED** OR connection has been established
**FAILED** attempt to establish OR connection failed
**CLOSED** OR connection has been closed
=============== ===========
.. data:: ORClosureReason (enum)
Reason that an OR connection is being closed or failed to be established. Tor
may provide reasons not in this enum.
=================== ===========
ORClosureReason Description
=================== ===========
**DONE** OR connection shut down cleanly
**CONNECTREFUSED** got a ECONNREFUSED when connecting to the relay
**IDENTITY** identity of the relay wasn't what we expected
**CONNECTRESET** got a ECONNRESET or similar error from relay
**TIMEOUT** got a ETIMEOUT or similar error from relay
**NOROUTE** got a ENOTCONN, ENETUNREACH, ENETDOWN, EHOSTUNREACH, or similar error from relay
**IOERROR** got a different kind of error from relay
**RESOURCELIMIT** relay has insufficient resources to service the request
**MISC** connection refused for another reason
=================== ===========
.. data:: AuthDescriptorAction (enum)
Actions that directory authorities might take with relay descriptors. Tor may
provide reasons not in this enum.
===================== ===========
AuthDescriptorAction Description
===================== ===========
**ACCEPTED** accepting the descriptor as the newest version
**DROPPED** descriptor rejected without notifying the relay
**REJECTED** relay notified that its descriptor has been rejected
===================== ===========
.. data:: StatusType (enum)
Sources for tor status events. Tor may provide types not in this enum.
============= ===========
StatusType Description
============= ===========
**GENERAL** general tor activity, not specifically as a client or relay
**CLIENT** related to our activity as a tor client
**SERVER** related to our activity as a tor relay
============= ===========
.. data:: GuardType (enum)
Use a guard relay can be for. Tor may provide types not in this enum.
=========== ===========
GuardType Description
=========== ===========
**ENTRY** used to connect to the tor network
=========== ===========
.. data:: GuardStatus (enum)
Status a guard relay can have. Tor may provide types not in this enum.
============= ===========
GuardStatus Description
============= ===========
**NEW** new guard that we weren't previously using
**DROPPED** removed from use as one of our guards
**UP** guard is now reachable
**DOWN** guard is now unreachable
**BAD** consensus or relay considers this relay to be unusable as a guard
**GOOD** consensus or relay considers this relay to be usable as a guard
============= ===========
.. data:: TimeoutSetType (enum)
Way in which the timeout value of a circuit is changing. Tor may provide
types not in this enum.
=============== ===========
TimeoutSetType Description
=============== ===========
**COMPUTED** tor has computed a new timeout based on prior circuits
**RESET** timeout reverted to its default
**SUSPENDED** timeout reverted to its default until network connectivity has recovered
**DISCARD** throwing out timeout value from when the network was down
**RESUME** resumed calculations to determine the proper timeout
=============== ===========
"""
__version__ = '1.1.1'
__author__ = 'Damian Johnson'
__contact__ = 'atagar@torproject.org'
__url__ = 'https://stem.torproject.org/'
__license__ = 'LGPLv3'
__all__ = [
"descriptor",
"response",
"util",
"connection",
"control",
"exit_policy",
"prereq",
"process",
"socket",
"version",
"ControllerError",
"ProtocolError",
"OperationFailed",
"UnsatisfiableRequest",
"CircuitExtensionFailed",
"InvalidRequest",
"InvalidArguments",
"SocketError",
"SocketClosed",
"Runlevel",
"Signal",
"Flag",
"CircStatus",
"CircBuildFlag",
"CircPurpose",
"CircClosureReason",
"CircEvent",
"HiddenServiceState",
"RelayEndReason",
"StreamStatus",
"StreamClosureReason",
"StreamSource",
"StreamPurpose",
"ORStatus",
"ORClosureReason",
"AuthDescriptorAction",
"StatusType",
"GuardType",
"GuardStatus",
"TimeoutSetType",
]
import stem.util.enum
# Constant to indicate an undefined argument default. Usually we'd use None for
# this, but users will commonly provide None as the argument so need something
# else fairly unique...
UNDEFINED = "<Undefined_ >"
class ControllerError(Exception):
"Base error for controller communication issues."
class ProtocolError(ControllerError):
"Malformed content from the control socket."
class OperationFailed(ControllerError):
"""
Base exception class for failed operations that return an error code
:var str code: error code returned by Tor
:var str message: error message returned by Tor or a human readable error
message
"""
def __init__(self, code = None, message = None):
super(ControllerError, self).__init__(message)
self.code = code
self.message = message
class UnsatisfiableRequest(OperationFailed):
"""
Exception raised if Tor was unable to process our request.
"""
class CircuitExtensionFailed(UnsatisfiableRequest):
"""
An attempt to create or extend a circuit failed.
:var stem.response.CircuitEvent circ: response notifying us of the failure
"""
def __init__(self, message, circ = None):
super(CircuitExtensionFailed, self).__init__(message = message)
self.circ = circ
class InvalidRequest(OperationFailed):
"""
Exception raised when the request was invalid or malformed.
"""
class InvalidArguments(InvalidRequest):
"""
Exception class for requests which had invalid arguments.
:var str code: error code returned by Tor
:var str message: error message returned by Tor or a human readable error
message
:var list arguments: a list of arguments which were invalid
"""
def __init__(self, code = None, message = None, arguments = None):
super(InvalidArguments, self).__init__(code, message)
self.arguments = arguments
class SocketError(ControllerError):
"Error arose while communicating with the control socket."
class SocketClosed(SocketError):
"Control socket was closed before completing the message."
Runlevel = stem.util.enum.UppercaseEnum(
"DEBUG",
"INFO",
"NOTICE",
"WARN",
"ERR",
)
Flag = stem.util.enum.Enum(
("AUTHORITY", "Authority"),
("BADEXIT", "BadExit"),
("BADDIRECTORY", "BadDirectory"),
("EXIT", "Exit"),
("FAST", "Fast"),
("GUARD", "Guard"),
("HSDIR", "HSDir"),
("NAMED", "Named"),
("RUNNING", "Running"),
("STABLE", "Stable"),
("UNNAMED", "Unnamed"),
("V2DIR", "V2Dir"),
("V3DIR", "V3Dir"),
("VALID", "Valid"),
)
Signal = stem.util.enum.UppercaseEnum(
"RELOAD",
"HUP",
"SHUTDOWN",
"INT",
"DUMP",
"USR1",
"DEBUG",
"USR2",
"HALT",
"TERM",
"NEWNYM",
"CLEARDNSCACHE",
)
CircStatus = stem.util.enum.UppercaseEnum(
"LAUNCHED",
"BUILT",
"EXTENDED",
"FAILED",
"CLOSED",
)
CircBuildFlag = stem.util.enum.UppercaseEnum(
"ONEHOP_TUNNEL",
"IS_INTERNAL",
"NEED_CAPACITY",
"NEED_UPTIME",
)
CircPurpose = stem.util.enum.UppercaseEnum(
"GENERAL",
"HS_CLIENT_INTRO",
"HS_CLIENT_REND",
"HS_SERVICE_INTRO",
"HS_SERVICE_REND",
"TESTING",
"CONTROLLER",
"MEASURE_TIMEOUT",
)
CircClosureReason = stem.util.enum.UppercaseEnum(
"NONE",
"TORPROTOCOL",
"INTERNAL",
"REQUESTED",
"HIBERNATING",
"RESOURCELIMIT",
"CONNECTFAILED",
"OR_IDENTITY",
"OR_CONN_CLOSED",
"FINISHED",
"TIMEOUT",
"DESTROYED",
"NOPATH",
"NOSUCHSERVICE",
"MEASUREMENT_EXPIRED",
)
CircEvent = stem.util.enum.UppercaseEnum(
"PURPOSE_CHANGED",
"CANNIBALIZED",
)
HiddenServiceState = stem.util.enum.UppercaseEnum(
"HSCI_CONNECTING",
"HSCI_INTRO_SENT",
"HSCI_DONE",
"HSCR_CONNECTING",
"HSCR_ESTABLISHED_IDLE",
"HSCR_ESTABLISHED_WAITING",
"HSCR_JOINED",
"HSSI_CONNECTING",
"HSSI_ESTABLISHED",
"HSSR_CONNECTING",
"HSSR_JOINED",
)
RelayEndReason = stem.util.enum.UppercaseEnum(
"MISC",
"RESOLVEFAILED",
"CONNECTREFUSED",
"EXITPOLICY",
"DESTROY",
"DONE",
"TIMEOUT",
"NOROUTE",
"HIBERNATING",
"INTERNAL",
"RESOURCELIMIT",
"CONNRESET",
"TORPROTOCOL",
"NOTDIRECTORY",
)
StreamStatus = stem.util.enum.UppercaseEnum(
"NEW",
"NEWRESOLVE",
"REMAP",
"SENTCONNECT",
"SENTRESOLVE",
"SUCCEEDED",
"FAILED",
"DETACHED",
"CLOSED",
)
# StreamClosureReason is a superset of RelayEndReason
StreamClosureReason = stem.util.enum.UppercaseEnum(*(RelayEndReason.keys() + [
"END",
"PRIVATE_ADDR",
]))
StreamSource = stem.util.enum.UppercaseEnum(
"CACHE",
"EXIT",
)
StreamPurpose = stem.util.enum.UppercaseEnum(
"DIR_FETCH",
"DIR_UPLOAD",
"DNS_REQUEST",
"DIRPORT_TEST",
"USER",
)
ORStatus = stem.util.enum.UppercaseEnum(
"NEW",
"LAUNCHED",
"CONNECTED",
"FAILED",
"CLOSED",
)
ORClosureReason = stem.util.enum.UppercaseEnum(
"DONE",
"CONNECTREFUSED",
"IDENTITY",
"CONNECTRESET",
"TIMEOUT",
"NOROUTE",
"IOERROR",
"RESOURCELIMIT",
"MISC",
)
AuthDescriptorAction = stem.util.enum.UppercaseEnum(
"ACCEPTED",
"DROPPED",
"REJECTED",
)
StatusType = stem.util.enum.UppercaseEnum(
"GENERAL",
"CLIENT",
"SERVER",
)
GuardType = stem.util.enum.UppercaseEnum(
"ENTRY",
)
GuardStatus = stem.util.enum.UppercaseEnum(
"NEW",
"UP",
"DOWN",
"BAD",
"GOOD",
"DROPPED",
)
TimeoutSetType = stem.util.enum.UppercaseEnum(
"COMPUTED",
"RESET",
"SUSPENDED",
"DISCARD",
"RESUME",
)
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