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#
# SPDX-FileCopyrightText: 2016 - 2026 Dimitri Staessens
# SPDX-License-Identifier: LGPL-2.1-only
#
"""
Exception hierarchy and errno translation for pyouroboros.
The ``E*`` constants mirror the Ouroboros-specific errno values in
``include/ouroboros/errno.h``.
"""
from __future__ import annotations
import errno
import os
from importlib.metadata import PackageNotFoundError, version
ENOTALLOC = 1000 # Flow is not allocated
EIPCPTYPE = 1001 # Unknown IPCP type
EIRMD = 1002 # Failed to communicate with IRMD
EIPCP = 1003 # Failed to communicate with IPCP
EIPCPSTATE = 1004 # Target in wrong state
EFLOWDOWN = 1005 # Flow is down
EFLOWPEER = 1006 # Flow is down (peer timed out)
ENAME = 1007 # Naming error
ECRYPT = 1008 # Encryption error
EAUTH = 1009 # Authentication error
EREPLAY = 1010 # OAP replay detected
_O7S_ERRNO_STR: dict[int, str] = {
ENOTALLOC: "flow is not allocated",
EIPCPTYPE: "unknown IPCP type",
EIRMD: "failed to communicate with IRMd",
EIPCP: "failed to communicate with IPCP",
EIPCPSTATE: "target in wrong state",
EFLOWDOWN: "flow is down",
EFLOWPEER: "flow peer timed out",
ENAME: "naming error",
ECRYPT: "encryption error",
EAUTH: "authentication error",
EREPLAY: "OAP replay detected",
}
class OuroborosError(Exception):
"""
Base class for all pyouroboros exceptions.
"""
class IrmError(OuroborosError):
"""
Base class for IRM (control plane) errors.
"""
class IpcpCreateError(IrmError):
"""
Raised when IPCP creation fails.
"""
class IpcpBootstrapError(IrmError):
"""
Raised when IPCP bootstrapping fails.
"""
class IpcpEnrollError(IrmError):
"""
Raised when IPCP enrollment fails.
"""
class IpcpConnectError(IrmError):
"""
Raised when IPCP connection or disconnection fails.
"""
class IpcpTypeError(IrmError, ValueError):
"""
Raised when an unknown IPCP type is encountered.
"""
class IpcpStateError(IrmError):
"""
Raised when an IPCP/IRMd is in the wrong state for the request.
"""
class IrmdError(IrmError):
"""
Raised when the IRM daemon is unreachable.
"""
class IpcpdError(IrmError):
"""
Raised when the IPCP daemon is unreachable.
"""
class BindError(IrmError):
"""
Raised when binding a program/process/IPCP to a name fails.
"""
class NameNotFoundError(IrmError):
"""
Raised when a name lookup or unregister target is missing.
"""
class NameExistsError(IrmError):
"""
Raised when a name already exists.
"""
class InvalidNameError(IrmError, ValueError):
"""
Raised when a name is malformed or otherwise invalid.
"""
class FlowError(OuroborosError):
"""
Base class for flow-plane errors.
"""
class FlowAlreadyAllocatedError(FlowError):
"""
Raised when allocating on a Flow that already holds an fd.
"""
class FlowNotAllocatedError(FlowError):
"""
Raised when operating on a Flow that has no fd.
"""
class FlowDownError(FlowError, ConnectionError):
"""
Raised when the flow has gone down.
"""
class FlowPeerError(FlowDownError):
"""
Raised when the flow's peer has timed out.
"""
class FlowPermissionError(FlowError, PermissionError):
"""
Raised when an operation is not permitted on the flow.
"""
class FlowTimeout(FlowError, TimeoutError):
"""
Raised when a flow operation times out.
"""
class FlowCryptError(FlowError):
"""
Raised on flow encryption errors.
"""
class FlowAuthError(FlowError):
"""
Raised on flow authentication errors.
"""
class FlowReplayError(FlowError):
"""
Raised when OAP replay is detected.
"""
class FlowEventError(FlowError):
"""
Raised on errors from the flow event subsystem.
"""
class FlowDeallocWarning(Warning):
"""
Warning issued when a deallocation reports a non-fatal problem.
"""
_ERRNO_MAP: dict[int, type[BaseException]] = {
errno.ETIMEDOUT: TimeoutError,
errno.EAGAIN: BlockingIOError,
errno.EWOULDBLOCK: BlockingIOError,
errno.ENOMEM: MemoryError,
errno.EACCES: PermissionError,
errno.ENOTCONN: ConnectionError,
errno.ECONNRESET: ConnectionResetError,
ENOTALLOC: FlowNotAllocatedError,
EIPCPTYPE: IpcpTypeError,
EIRMD: IrmdError,
EIPCP: IpcpdError,
EIPCPSTATE: IpcpStateError,
EFLOWDOWN: FlowDownError,
EFLOWPEER: FlowPeerError,
ENAME: NameNotFoundError,
ECRYPT: FlowCryptError,
EAUTH: FlowAuthError,
EREPLAY: FlowReplayError,
}
def _strerror(err: int) -> str:
if err >= 1000:
return _O7S_ERRNO_STR.get(err, f"ouroboros errno {err}")
return os.strerror(err)
def raise_errno(rc: int, default: type[OuroborosError] = FlowError) -> int:
"""
Translate a non-negative-or-negative-errno return code.
``_ERRNO_MAP`` holds errnos in their canonical positive form.
:param rc: The return code to translate; a negative
value is a negated errno.
:param default: Exception class to raise when the errno
has no mapping; a mapped errno overrides
it.
:return: *rc* unchanged when it is non-negative.
:raises OuroborosError: (or the builtin mapped for ``-rc``) when
*rc* is negative.
"""
if rc >= 0:
return rc
err = -rc
exc_cls = _ERRNO_MAP.get(err, default)
raise exc_cls(_strerror(err))
def check_ouroboros_version(o7s_major: int, o7s_minor: int) -> None:
"""
Verify that the installed pyouroboros matches the linked library.
Compares the linked library version against the installed
pyouroboros distribution metadata. Silently returns when running
from a source tree without distribution metadata.
:param o7s_major: Major version of the linked library, from
``OUROBOROS_VERSION_MAJOR`` in the CFFI
module.
:param o7s_minor: Minor version of the linked library, from
``OUROBOROS_VERSION_MINOR`` in the CFFI
module.
:raises RuntimeError: If the library and pyouroboros ``major.minor``
differ.
"""
try:
pyo7s_parts = version("PyOuroboros").split(".")
except PackageNotFoundError:
return
if o7s_major != int(pyo7s_parts[0]) or \
o7s_minor != int(pyo7s_parts[1]):
raise RuntimeError(
f"Ouroboros version mismatch: library is "
f"{o7s_major}.{o7s_minor}, pyouroboros is "
f"{pyo7s_parts[0]}.{pyo7s_parts[1]}"
)
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