def test_tcpdump_execute(self):
"""Check tcpdump filter monitors ping using execute"""
self.ping_all_when_learned()
from_host = self.net.hosts[0]
to_host = self.net.hosts[1]
tcpdump_filter = ('icmp')
tcpdump_helper = TcpdumpHelper(
to_host, tcpdump_filter,
[lambda: from_host.cmd('ping -c1 %s' % to_host.IP())])
tcpdump_txt = tcpdump_helper.execute()
self.assertTrue(
re.search('%s: ICMP echo request' % to_host.IP(), tcpdump_txt))
self._terminate_with_zero(tcpdump_helper)
def test_tcpdump_noblock(self):
"""Check tcpdump uses nonblocking next_line"""
self.ping_all_when_learned()
from_host = self.net.hosts[0]
to_host = self.net.hosts[1]
tcpdump_filter = ('icmp')
tcpdump_helper = TcpdumpHelper(
to_host,
tcpdump_filter,
[lambda: from_host.cmd('ping -c10 %s' % to_host.IP())],
blocking=False,
packets=None)
count = 0
while tcpdump_helper.next_line():
count = count + 1
self.assertTrue(count < 10, 'Too many ping results before noblock')
self._terminate_with_nonzero(tcpdump_helper)
def test_tcpdump_pcap(self):
"""Check tcpdump creates pcap output"""
self.ping_all_when_learned()
from_host = self.net.hosts[0]
to_host = self.net.hosts[1]
tcpdump_filter = ('icmp')
pcap_file = os.path.join(self.tmpdir, 'out.pcap')
tcpdump_helper = TcpdumpHelper(
to_host,
tcpdump_filter,
[lambda: from_host.cmd('ping -c3 %s' % to_host.IP())],
pcap_out=pcap_file,
packets=None)
tcpdump_helper.execute()
self._terminate_with_zero(tcpdump_helper)
result = from_host.cmd('tcpdump -en -r %s' % pcap_file)
self.assertEqual(result.count('ICMP echo reply'), 3,
'three icmp echo replies')
def test_tcpdump_nextline(self):
"""Check tcpdump filter monitors ping using next_line"""
self.ping_all_when_learned()
from_host = self.net.hosts[0]
to_host = self.net.hosts[1]
tcpdump_filter = ('icmp')
tcpdump_helper = TcpdumpHelper(
to_host, tcpdump_filter,
[lambda: from_host.cmd('ping -c2 %s' % to_host.IP())])
self.assertTrue(re.search('proto ICMP', tcpdump_helper.next_line()))
next_line = tcpdump_helper.next_line()
self.assertTrue(
re.search('%s: ICMP echo request' % to_host.IP(), next_line),
next_line)
self.assertTrue(re.search('proto ICMP', tcpdump_helper.next_line()))
next_line = tcpdump_helper.next_line()
self.assertTrue(
re.search('%s: ICMP echo reply' % from_host.IP(), next_line),
next_line)
self.assertFalse(re.search('ICMP', tcpdump_helper.next_line()))
self.assertNotEqual(tcpdump_helper.terminate(), 0,
'terminate result code')
def tcpdump_helper(*args, **kwargs):
"""Return running TcpdumpHelper instance"""
return TcpdumpHelper(*args, **kwargs).execute()
def tcpdump_helper(*args, **kwargs):
"""Return running TcpdumpHelper instance"""
tcpdump_helper = TcpdumpHelper(*args, **kwargs)
tcpdump_capture = tcpdump_helper.execute()
tcpdump_helper.terminate()
return tcpdump_capture