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# Copyright (c) 2020 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Core dump library."""
from resources.libraries.python.Constants import Constants
from resources.libraries.python.DUTSetup import DUTSetup
from resources.libraries.python.LimitUtil import LimitUtil
from resources.libraries.python.SysctlUtil import SysctlUtil
from resources.libraries.python.ssh import exec_cmd_no_error
from resources.libraries.python.topology import NodeType
__all__ = [u"CoreDumpUtil"]
class CoreDumpUtil:
"""Class contains methods for processing core dumps."""
# Use one instance of class for all tests. If the functionality should
# be enabled per suite or per test case, change the scope to "TEST SUITE" or
# "TEST CASE" respectively.
ROBOT_LIBRARY_SCOPE = u"GLOBAL"
def __init__(self):
"""Initialize CoreDumpUtil class."""
# Corekeeper is configured.
self._corekeeper_configured = False
# Enable setting core limit for process. This can be used to prevent
# library to further set the core limit for unwanted behavior.
self._core_limit_enabled = True
def set_core_limit_enabled(self):
"""Enable setting of core limit for PID."""
self._core_limit_enabled = True
def set_core_limit_disabled(self):
"""Disable setting of core limit for PID."""
self._core_limit_enabled = False
def is_core_limit_enabled(self):
"""Check if core limit is set for process.
:returns: True if core limit is set for process.
:rtype: bool
"""
return self._corekeeper_configured and self._core_limit_enabled
def setup_corekeeper_on_all_nodes(self, nodes):
"""Setup core dumps system wide on all nodes.
:param nodes: Nodes in the topology.
:type nodes: dict
"""
for node in nodes.values():
# Any binary which normally would not be dumped is dumped anyway,
# but only if the "core_pattern" kernel sysctl is set to either a
# pipe handler or a fully qualified path. (For more details on this
# limitation, see CVE-2006-2451.) This mode is appropriate when
# administrators are attempting to debug problems in a normal
# environment, and either have a core dump pipe handler that knows
# to treat privileged core dumps with care, or specific directory
# defined for catching core dumps. If a core dump happens without a
# pipe handler or fully qualified path, a message will be emitted to
# syslog warning about the lack of a correct setting.
SysctlUtil.set_sysctl_value(node, u"fs.suid_dumpable", 2)
# Specify a core dumpfile pattern name (for the output filename).
# %p pid
# %u uid (in initial user namespace)
# %g gid (in initial user namespace)
# %s signal number
# %t UNIX time of dump
# %h hostname
# %e executable filename (may be shortened)
SysctlUtil.set_sysctl_value(
node, u"kernel.core_pattern", Constants.KERNEL_CORE_PATTERN
)
self._corekeeper_configured = True
@staticmethod
def enable_coredump_limit(node, pid):
"""Enable coredump for PID(s) by setting no core limits.
:param node: Node in the topology.
:param pid: Process ID(s) to set core dump limit to unlimited.
:type node: dict
:type pid: list or int
"""
if isinstance(pid, list):
for item in pid:
LimitUtil.set_pid_limit(node, item, u"core", u"unlimited")
LimitUtil.get_pid_limit(node, item)
else:
LimitUtil.set_pid_limit(node, pid, u"core", u"unlimited")
LimitUtil.get_pid_limit(node, pid)
def enable_coredump_limit_vpp(self, node):
"""Enable coredump for VPP PID by setting no core limits on DUT
if setting of core limit by this library is enabled.
:param node: DUT Node in the topology.
:type node: dict
"""
if node[u"type"] == NodeType.DUT and self.is_core_limit_enabled():
vpp_pid = DUTSetup.get_pid(node, u"vpp")
self.enable_coredump_limit(node, vpp_pid)
def enable_coredump_limit_vpp_on_all_duts(self, nodes):
"""Enable coredump for all VPP PIDs by setting no core limits on all
DUTs if setting of core limit by this library is enabled.
:param nodes: Nodes in the topology.
:type nodes: dict
"""
for node in nodes.values():
self.enable_coredump_limit_vpp(node)
def get_core_files_on_all_nodes(self, nodes, disable_on_success=True):
"""Process all core files and remove the original core files on all
nodes.
:param nodes: Nodes in the topology.
:param disable_on_success: If True, disable setting of core limit by
this instance of library. Default: True
:type nodes: dict
:type disable_on_success: bool
"""
for node in nodes.values():
if node[u"type"] == NodeType.DUT:
command = (
f"for f in {Constants.CORE_DUMP_DIR}/*.core; do "
f"sudo gdb /usr/bin/vpp ${{f}} "
f"-ex 'source -v {Constants.REMOTE_FW_DIR}"
f"/resources/tools/scripts/gdb-commands' -ex quit; "
f"sudo rm -f ${{f}}; done"
)
try:
exec_cmd_no_error(node, command, timeout=3600)
if disable_on_success:
self.set_core_limit_disabled()
except RuntimeError:
# If compress was not successful ignore error and skip
# further processing.
continue
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