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# Copyright (c) 2017 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.
"""Keywords used for setup and testing of Honeycomb's control-plane interface
using IPv6.
"""
from resources.libraries.python.ssh import SSH
class IPv6Management(object):
"""Utilities for managing IPv6 contol-plane interfaces."""
def __init__(self):
pass
@staticmethod
def get_interface_name_by_mac(node, mac):
"""Get the name of an interface using its MAC address.
:param node: Node in topology.
:param mac: MAC address.
:type node: dict
:type mac: str
:returns: Name of the interface.
:rtype: str
:raises RuntimeError: If no interface is found.
"""
cmd = " | ".join([
"fgrep -ls '{0}' /sys/class/net/*/address".format(mac),
"awk -F '/' '{print $5}'"
])
ssh = SSH()
ssh.connect(node)
ret_code, stdout, _ = ssh.exec_command(cmd)
if ret_code == 0:
return stdout.strip()
else:
raise RuntimeError("No interface found using the specified MAC "
"address.")
@staticmethod
def clear_interface_configuration(node, interface):
"""Remove all configured IP addresses from the specified interface
and set it into down state.
:param node: Node in topology.
:param interface: Name of an interface on the node.
:type node: dict
:type interface: str
:raises RuntimeError: If the configuration could not be cleared.
"""
cmd = " && ".join([
"sudo ip addr flush dev {interface}".format(interface=interface),
"sudo ip link set dev {interface} down".format(interface=interface)
])
ssh = SSH()
ssh.connect(node)
ret_code, _, _ = ssh.exec_command(cmd)
if ret_code != 0:
raise RuntimeError("Could not clear interface configuration.")
@staticmethod
def set_management_interface_address(node, interface, address, prefix):
"""Configure an IP address on the specified interface.
:param node: Node in topology.
:param interface: Name of an interface on the node.
:param address: IP address to configure.
:param prefix: IP network prefix.
:type node: dict
:type interface: str
:type address: str
:type prefix: int
:raises RuntimeError: If the configuration fails.
"""
ssh = SSH()
ssh.connect(node)
# Enable IPv6 for only the specified interface
cmd = "sudo sysctl net.ipv6.conf.{0}.disable_ipv6=0".format(interface)
ret_code, _, _ = ssh.exec_command(cmd)
if ret_code != 0:
raise RuntimeError("Could not enable IPv6 on interface.")
# Configure IPv6 address on the interface
cmd = "sudo ip address add {address}/{prefix} dev {interface}".format(
interface=interface,
address=address,
prefix=prefix)
ret_code, _, _ = ssh.exec_command(cmd)
if ret_code != 0:
raise RuntimeError("Could not configure IP address on interface.")
# Set the interface up
cmd = "sudo ip link set {interface} up".format(interface=interface)
ret_code, _, _ = ssh.exec_command(cmd)
if ret_code != 0:
raise RuntimeError("Could not change the interface to 'up' state.")
@staticmethod
def configure_control_interface_tunnel(node, src_port, dst_ip, dst_port):
"""Configure a tunnel on the specified node, tunelling any IPv4 traffic
from one port to the specified address.
:param node: Node in topology.
:param src_port: Port to tunnel traffic from.
:param dst_ip: IP address to tunnel traffic to.
:param dst_port: Port to tunnel traffic to.
:type node: dict
:type src_port: int
:type dst_ip: str
:type dst_port: int
:raises RuntimeError: If tunnel creation is not successful.
"""
cmd = "nohup socat TCP4-LISTEN:{src_port},fork,su=nobody " \
"TCP6:[{dst_ip}]:{dst_port} $@ > " \
"/tmp/socat.log 2>&1 &".format(
src_port=src_port,
dst_ip=dst_ip,
dst_port=dst_port)
ssh = SSH()
ssh.connect(node)
ret_code, _, _ = ssh.exec_command_sudo(cmd)
if ret_code != 0:
raise RuntimeError("Could not configure tunnel.")
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