test: add an helper to generate many neighbors

Using scapy, we generate a pcap with as many neighbors we need.

diff --git a/tests/many-neighbors.py b/tests/many-neighbors.py
new file mode 100644 (file)
index 0000000..c016e34
--- /dev/null
+++ b/tests/many-neighbors.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+
+# Simple script to generate a lot of neighbors. This uses scapy. It
+# needs a version of Scapy that contains an LLDP dissector. There is
+# one in the scapy community repository:
+#  https://hg.secdev.org/scapy-com/file/dc0876d1c302/scapy/layers/lldp.py
+
+from scapy.all import *
+from optparse import OptionParser
+
+parser = OptionParser()
+parser.add_option("-o", "--output", dest="output",
+                  help="write PCAP file to FILE", metavar="FILE",
+                  default="out.pcap")
+parser.add_option("-n", "--neighbors", dest="neighbors",
+                  help="generate N neighbors", metavar="N",
+                  default=60, type="int")
+
+(options, args) = parser.parse_args()
+
+wrpcap(options.output,
+       [Ether(dst="01:80:c2:00:00:0e", src="00:17:d1:a8:35:be")/
+        LLDP(tlvlist=[LLDPChassisId(subtype="Locally assigned", value="titi-%03d" % i),
+                      LLDPPortId(subtype="Interface name", value="eth0"),
+                      LLDPTTL(seconds=120),
+                      LLDPDUEnd()])
+        for i in range(options.neighbors)])
+
+# The generated pcap can be replayed with tcpreplay:
+#  tcpreplay -i veth0 -t out.pcap