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131 lines
3.7 KiB
Python
Executable File
131 lines
3.7 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright (C) 2021 by
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# Network Device Education Foundation, Inc. ("NetDEF")
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#
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# Permission to use, copy, modify, and/or distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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# PERFORMANCE OF THIS SOFTWARE.
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"""
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Subscribe to a multicast group so that the kernel sends an IGMP JOIN
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for the multicast group we subscribed to.
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"""
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import argparse
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import json
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import os
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import socket
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import struct
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import subprocess
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import sys
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import time
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#
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# Functions
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#
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def interface_name_to_index(name):
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"Gets the interface index using its name. Returns None on failure."
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interfaces = json.loads(
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subprocess.check_output('ip -j link show', shell=True))
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for interface in interfaces:
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if interface['ifname'] == name:
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return interface['ifindex']
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return None
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def multicast_join(sock, ifindex, group, port):
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"Joins a multicast group."
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mreq = struct.pack(
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"=4sLL", socket.inet_aton(args.group), socket.INADDR_ANY, ifindex
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)
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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sock.bind((group, port))
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sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
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#
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# Main code.
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#
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parser = argparse.ArgumentParser(description="Multicast RX utility")
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parser.add_argument('socket', help='Point to topotest UNIX socket')
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parser.add_argument('group', help='Multicast IP')
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parser.add_argument('interface', help='Interface name')
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parser.add_argument(
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'--send',
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help='Transmit instead of join with interval',
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type=float, default=0)
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args = parser.parse_args()
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ttl = 16
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port = 1000
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# Get interface index/validate.
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ifindex = interface_name_to_index(args.interface)
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if ifindex is None:
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sys.stderr.write('Interface {} does not exists\n'.format(args.interface))
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sys.exit(1)
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# We need root privileges to set up multicast.
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if os.geteuid() != 0:
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sys.stderr.write("ERROR: You must have root privileges\n")
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sys.exit(1)
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# Wait for topotest to synchronize with us.
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toposock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM, 0)
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while True:
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try:
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toposock.connect(args.socket)
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break
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except ConnectionRefusedError:
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time.sleep(1)
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continue
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msock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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if args.send > 0:
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# Prepare multicast bit in that interface.
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msock.setsockopt(
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socket.SOL_SOCKET, 25,
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struct.pack("%ds" % len(args.interface),
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args.interface.encode('utf-8')))
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# Set packets TTL.
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msock.setsockopt(
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socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, struct.pack("b", ttl))
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# Block to ensure packet send.
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msock.setblocking(True)
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# Set topotest socket non blocking so we can multiplex the main loop.
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toposock.setblocking(False)
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else:
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multicast_join(msock, ifindex, args.group, port)
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counter = 0
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while True:
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if args.send > 0:
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msock.sendto(b"test %d" % counter, (args.group, port))
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counter += 1
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time.sleep(args.send)
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try:
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data = toposock.recv(1)
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if data == b'':
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print(' -> Connection closed')
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break
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except BlockingIOError:
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continue
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msock.close()
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sys.exit(0)
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