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#!/usr/bin/env python
# Thu, 13 Mar 14 (PDT)
# copy-first-n.rb: Copies first n records from one trace to another
# Copyright (C) 2015, Nevil Brownlee, U Auckland | WAND
# python copy-first-n.py pcapfile:anon-v4.pcap pcapfile:first-n.pcap 30
import plt # Also imports IPprefix and datetime
import sys # argv, exit
in_uri = sys.argv[1] # Program name is argv[0]
out_uri = sys.argv[2]
n_records = sys.argv[3]
if not n_records or int(n_records) <= 0:
print "Number of records to copy not specified <<<"
exit()
else:
n_records = int(n_records)
print "copying first %d records from %s to %s ..." % (
n_records, in_uri, out_uri)
t = plt.trace(in_uri)
t.start()
ot = plt.output_trace(out_uri)
ot.start_output()
n = 0
for pkt in t:
n += 1
ot.write_packet(pkt)
if n == n_records:
break
ot.close_output(); t.close()
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