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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
from plt_testing import *
in_uri = 'icmp-sample.pcap'
out_uri = 'pcapfile:icmp-sample-out.pcap'
n_records = 10
test_println("copying first %d records from %s to %s ..." % (
n_records, in_uri, out_uri), get_tag())
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
if n != n_records:
test_println("error copying records. only %d out of %d were copied." % (n, n_records), get_tag())
else:
test_println("%d records were copied successfully." % (n), get_tag())
ot.close_output(); t.close()
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