mirror of
https://github.com/kernelkit/infix.git
synced 2026-08-04 22:53:02 +02:00
Joachim WibergandTobias Waldekranz
9a5c619571
Monday fixup, audit with @wkz Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
"""Sniff for packets using tcpdump"""
|
|
import os
|
|
import signal
|
|
import subprocess
|
|
import tempfile
|
|
import time
|
|
|
|
class Sniffer:
|
|
"""Helper class for tcpdump"""
|
|
def __init__(self, netns, expr):
|
|
self.pcap = tempfile.NamedTemporaryFile(suffix=".pcap", delete=False)
|
|
self.expr = expr
|
|
self.netns = netns
|
|
self.proc = None
|
|
|
|
def __del__(self):
|
|
self.pcap.close()
|
|
os.unlink(self.pcap.name)
|
|
|
|
def __enter__(self):
|
|
cmd = f"tcpdump -lni iface -w {self.pcap.name} {self.expr}"
|
|
arg = cmd.split(" ")
|
|
self.proc = self.netns.popen(arg, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
|
|
|
|
def __exit__(self, _, __, ___):
|
|
if not self.proc:
|
|
return False
|
|
|
|
self.proc.send_signal(signal.SIGINT)
|
|
time.sleep(1)
|
|
if not self.proc.poll():
|
|
try:
|
|
self.proc.kill()
|
|
except OSError:
|
|
pass
|
|
self.proc.wait()
|
|
return True
|
|
|
|
def output(self):
|
|
"""Return PCAP output"""
|
|
return self.netns.runsh(f"tcpdump -n -r {self.pcap.name}")
|