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# Copyright (c) 2016 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.
"""IPv6 utilities library."""
import re
from ssh import SSH
class IPv6Util(object):
"""IPv6 utilities"""
def __init__(self):
pass
@staticmethod
def ipv6_ping(src_node, dst_addr, count=3, data_size=56, timeout=1):
"""IPv6 ping.
Args:
src_node (Dict): Node where ping run.
dst_addr (str): Destination IPv6 address.
count (Optional[int]): Number of echo requests.
data_size (Optional[int]): Number of the data bytes.
timeout (Optional[int]): Time to wait for a response, in seconds.
Returns:
Number of lost packets.
"""
ssh = SSH()
ssh.connect(src_node)
cmd = "ping6 -c {c} -s {s} -W {W} {dst}".format(c=count, s=data_size,
W=timeout,
dst=dst_addr)
(ret_code, stdout, _) = ssh.exec_command(cmd)
regex = re.compile(r'(\d+) packets transmitted, (\d+) received')
match = regex.search(stdout)
sent, received = match.groups()
packet_lost = int(sent) - int(received)
return packet_lost
@staticmethod
def ipv6_ping_port(nodes_ip, src_node, dst_node, port, cnt=3,
size=56, timeout=1):
"""Send IPv6 ping to the node port.
Args:
nodes_ip (Dict): Nodes IPv6 adresses.
src_node (Dict): Node where ping run.
dst_node (Dict): Destination node.
port (str): Port on the destination node.
cnt (Optional[int]): Number of echo requests.
size (Optional[int]): Number of the data bytes.
timeout (Optional[int]): Time to wait for a response, in seconds.
Returns:
Number of lost packets.
"""
dst_ip = IPv6Util.get_node_port_ipv6_address(dst_node, port, nodes_ip)
return IPv6Util.ipv6_ping(src_node, dst_ip, cnt, size, timeout)
@staticmethod
def get_node_port_ipv6_address(node, interface, nodes_addr):
"""Return IPv6 address of the node port.
Args:
node (Dict): Node in the topology.
interface (str): Interface name of the node.
nodes_addr (Dict): Nodes IPv6 adresses.
Returns:
IPv6 address string.
"""
for net in nodes_addr.values():
for port in net['ports'].values():
host = port.get('node')
dev = port.get('if')
if host == node['host'] and dev == interface:
ip = port.get('addr')
if ip is not None:
return ip
else:
raise Exception(
'Node {n} port {p} IPv6 address is not set'.format(
n=node['host'], p=interface))
raise Exception('Node {n} port {p} IPv6 address not found.'.format(
n=node['host'], p=interface))
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