1 files changed, 83 insertions, 0 deletions
diff --git a/tests/topotests/pim-basic/mcast-rx.py b/tests/topotests/pim-basic/mcast-rx.py
new file mode 100755
index 0000000000..9e3484e12a
--- /dev/null
+++ b/tests/topotests/pim-basic/mcast-rx.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+#
+# mcast-rx.py
+#
+# Copyright (c) 2018 Cumulus Networks, Inc.
+#
+# Permission to use, copy, modify, and/or distribute this software
+# for any purpose with or without fee is hereby granted, provided
+# that the above copyright notice and this permission notice appear
+# in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND Cumulus Networks DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+#
+"""
+Subscribe to a multicast group so that the kernel sends an IGMP JOIN
+for the multicast group we subscribed to.
+"""
+
+import argparse
+import logging
+import re
+import os
+import socket
+import subprocess
+import struct
+import sys
+import time
+
+
+def ifname_to_ifindex(ifname):
+    output = subprocess.check_output("ip link show %s" % ifname, shell=True)
+    first_line = output.split('\n')[0]
+    re_index = re.search('^(\d+):', first_line)
+
+    if re_index:
+        return int(re_index.group(1))
+
+    log.error("Could not parse the ifindex for %s out of\n%s" % (ifname, first_line))
+    return None
+
+
+# Thou shalt be root
+if os.geteuid() != 0:
+    sys.stderr.write('ERROR: You must have root privileges\n')
+    sys.exit(1)
+
+
+logging.basicConfig(level=logging.DEBUG, format='%(asctime)s %(levelname)5s: %(message)s')
+
+# Color the errors and warnings in red
+logging.addLevelName(logging.ERROR, "\033[91m  %s\033[0m" % logging.getLevelName(logging.ERROR))
+logging.addLevelName(logging.WARNING, "\033[91m%s\033[0m" % logging.getLevelName(logging.WARNING))
+log = logging.getLogger(__name__)
+
+parser = argparse.ArgumentParser(description='Multicast RX utility',
+                                 version='1.0.0')
+parser.add_argument('group', help='Multicast IP')
+parser.add_argument('ifname', help='Interface name')
+parser.add_argument('--port', help='UDP port', default=1000)
+parser.add_argument('--sleep', help='Time to sleep before we stop waiting',
+                    default = 5)
+args = parser.parse_args()
+
+# Create the datagram socket
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+sock.bind((args.group, args.port))
+
+newpid = os.fork()
+
+if newpid == 0:
+    ifindex = ifname_to_ifindex(args.ifname)
+    mreq = struct.pack("=4sLL", socket.inet_aton(args.group), socket.INADDR_ANY, ifindex)
+    sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
+    time.sleep(float(args.sleep))
+    sock.close()