tests: Add framework support for multicast-pim-bsm-topo1

1. Added framework support for multicast-pim-bsm-topo1 suite automation

Signed-off-by: Kuldeep Kashyap <kashyapk@vmware.com>

tests/topotests/lib/send_bsr_packet.py

@@ -0,0 +1,58 @@
+#
+# Copyright (c) 2019 by VMware, Inc. ("VMware")
+# Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
+# ("NetDEF") in this file.
+#
+# 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 VMWARE DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE 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.
+#
+
+import sys
+import argparse
+from scapy.all import Raw, sendp
+import binascii
+
+
+def send_packet(packet, iface, interval, count):
+    """
+    Read BSR packet in Raw format and send it to specified interface
+
+    Parameter:
+    ---------
+    * `packet` : BSR packet in raw format
+    * `interface` : Interface from which packet would be send
+    * `interval` : Interval between the packets
+    * `count` : Number of packets to be sent
+    """
+
+    data = binascii.a2b_hex(packet)
+    p = Raw(load=data)
+    p.show()
+    sendp(p, inter=int(interval), iface=iface, count=int(count))
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Send BSR Raw packet")
+    parser.add_argument("packet", help="Packet in raw format")
+    parser.add_argument("iface", help="Packet send to this ineterface")
+    parser.add_argument("--interval", help="Interval between packets", default=0)
+    parser.add_argument(
+        "--count", help="Number of times packet is sent repetitively", default=0
+    )
+    args = parser.parse_args()
+
+    if not args.packet or not args.iface:
+        sys.exit(1)
+
+    send_packet(args.packet, args.iface, args.interval, args.count)